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High-strength and high-modulus polyvinyl alcohol fiber, as a high-performance fiber product with excellent mechanical properties, biocompatibility and non-toxicity, has shown strong development momentum in the Chinese market in recent years. And driven by factors such as technological innovation, growing market demand, and increasing environmental awareness, the industry will continue to maintain rapid development.   The raw materials of high-strength and high-modulus PVA mainly include basic chemical raw materials such as coal, acetic acid, and vinyl acetate. These raw materials undergo a series of chemical reactions and are converted into preliminary products of polyvinyl alcohol (PVA), providing basic materials for the production of high-strength and high-modulus PVA.   The company uses upstream raw materials and uses specific spinning processes and drawing technologies to produce PVA fibers with excellent properties such as high strength and high modulus. This process requires advanced production equipment and technical support to ensure product quality and stability.   High-strength and high-modulus PVA fibers are widely used in many downstream industries, including building reinforcement materials, composite materials, textile industry (such as bulletproof vests, high-strength ropes, etc.), medical fields (such as surgical sutures, drug sustained-release carriers, etc.) and Environmental protection fields (such as water treatment, soil improvement, etc.). The needs and changes in the downstream market directly drive the development of the high-strength and high-module PVA industry.   The application of high-strength and high-modulus PVA fiber in the field of building materials is particularly prominent. It is mainly used to replace asbestos to enhance the strength and anti-cracking properties of cement products. Simply adding 0.3% to 0.5% of high-strength and high-modulus polyvinyl alcohol fiber and a small amount of polymer to substrates such as cement and gypsum can effectively change the brittleness of the substrate and eliminate cracks.   In textile, papermaking, coating and other fields, high-strength and high-modulus PVA fiber also plays an important role. In the field of textiles, it can be used as an auxiliary agent such as spinning fluid and textile slurry; in the field of papermaking, it is often used for surface coating, adhesion and paper strength improvement; in the field of coatings, it can enhance the adhesion of coatings and durability.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.

High degree of polymerization PVA has excellent strength and durability due to its high degree of polymerization, and is an important raw material for preparing high-strength materials. High degree of polymerization is generally above 5000.   1. High-strength adhesive: High-polymerized PVA can be used to prepare high-strength glues that can firmly bond various materials and are widely used in construction, automobiles, electronics and other fields. For example, in the construction field, PVA adhesives are used to bond ceramic tiles, stone, wood and other materials, showing good durability and water resistance.   2. Film materials: High-polymerization PVA can also prepare transparent film materials. These film materials have excellent tensile strength, crack resistance and air barrier properties, and are suitable for textiles, food packaging and other fields. For example, film materials made of high-polymerized PVA are widely used in the packaging of high-end textiles because they are non-static, oil-resistant, and resistant to organic chemicals.   3. Special functional materials: Due to its unique properties, ultra-high molecular PVA is often used to prepare materials with special functions. For example, in the field of biomedicine, ultra-high molecular PVA can be used as artificial blood vessels, biomedical materials, etc. Because of its good biocompatibility and mechanical properties, it can effectively replace or assist human tissue.   4. Advanced coating materials: Ultra-high molecular PVA can also be used to prepare advanced coating materials. These materials have excellent wear resistance, scratch resistance, chemical corrosion resistance and other properties, and are widely used on the surfaces of key components in automobiles, aerospace and other fields. coating.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.  

Low degree of polymerization PVA has good water solubility and plasticity due to its lower degree of polymerization and shorter molecular chain. These properties make low-polymerization PVA widely used in many fields. The degree of polymerization of PVA is generally below 1000.   1. Water-soluble adhesive: Low-polymerized PVA is often used as a water-soluble adhesive because of its excellent water solubility. For example, in the paper products industry, low-polymerized PVA is used for cardboard lamination, corrugated cardboard bonding, and office glue. It also has the advantage of being safe and non-toxic, making it widely used in the packaging industry, such as the bonding of kraft paper bags for heavy objects such as cement, fertilizers, and grain.   2. Coatings and coating materials: Low-polymer PVA can be used as a coating material on the surface of paper, which can significantly improve the gloss and anti-permeability of the paper. In addition, it can also be used as a pigment processing agent to improve the whiteness and gloss of coated paper and enhance the printing effect.   3. Commonly used low-polymerization polyvinyl alcohols such as PVA 05-88. This grade of PVA is also used for medical devices, warp sizing, release agents, etc.   Medium degree of polymerization PVA has a moderate degree of polymerization and exhibits good strength and heat resistance, so it is suitable for occasions that require a certain degree of strength and durability. The degree of polymerization of PVA is between 1000 and 5000.   1. Textile enhancer: Medium-polymerized PVA is commonly used as a textile enhancer in the textile industry. By adding it to textiles, it can significantly improve the softness and wear resistance of textiles, thereby extending their service life. For example, by blending medium-polymerized PVA with cotton, wool, viscose fiber, etc., you can produce Vinyl textiles with excellent properties.   2. Fiber products: Medium-polymerized PVA can also be used as a raw material for fiber products, such as PVA fiber (vinylon) that has been dissolved, spun and acetalized, and is widely used in clothing, tarpaulins, cords, fishing net ropes, etc.   3. Commonly used polyvinyl alcohols with medium polymerization degrees include PVA 17-88, 20-88, 24-88, 26-88 etc. These can also be used to produce glues, paper adhesives, fabric finishing agents, PVA films, etc     Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.

Polyvinyl alcohol is obtained through the alcoholysis of polyvinyl acetate. Its degree of alcoholysis refers to the percentage of the number of vinyl alcohol units in the molecular chain to the total number of molecular structural units. The degree of polymerization of polyvinyl alcohol refers to the number of repeating units in the molecular chain, which directly affects the length and physical properties of the molecule. The different degrees of polymerization determine the different application fields and properties of polyvinyl alcohol. For example, polyvinyl alcohol with an ultra-high degree of polymerization is often used in applications requiring greater strength and durability, while polyvinyl alcohol with a lower degree of polymerization may be more suitable for applications requiring better solubility or flexibility.   For example: According to the chemical formula of polyvinyl alcohol (-C2H2O-)n, PVA 2488, -88 means that the degree of alcoholysis is 88mol%, and 24- means that its degree of polymerization is about 2400, so the ideal molecular formula of PVA2488 should be (-C2H2O-) 2400. The adjustment is approximately 2400*44=105600. Therefore, one is to measure the size of the formed skeleton, and the other is to measure the conversion rate into the desired product. Those two are different.     Polyvinyl alcohol (PVA) is the hydrolyzate of polyvinyl acetate. The solvent of PVA is water, but its solubility in water is largely affected by the degree of polymerization and is dominated by the degree of alcoholysis. Completely alcoholylated PVA has very little dissolution in water. When the alcoholysis degree is below 88%, it is almost completely dissolved at room temperature of 20°C. However, as the alcoholysis degree increases, the solubility decreases significantly. Solubility PVA is soluble in water. The higher the water temperature, the greater the solubility, but it is almost insoluble in organic solvents.   PVA solubility changes with the degree of alcoholysis and polymerization. .Partial alcoholysis and low polymerization degree PVA dissolve very quickly, while complete alcoholysis and high polymerization degree PVA dissolve slowly. As a general rule, the degree of alcoholysis has a greater impact on the solubility of PVA than the degree of polymerization.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.

VAE (ethylene-vinyl acetate copolymer) emulsion viscosity is an important quality indicator and has a significant impact on product mass transfer, heat transfer, fluid flow, emulsion stability and emulsion transportation. Monomer ratio, polymerization temperature, initiator, emulsifier system optimization, electrolyte additives, and storage conditions are all factors that affect the viscosity of VAE emulsion.   1. Monomer ratio The selection and proportion of monomers directly affect the viscosity and other properties of VAE emulsion. The ratio of ethylene to vinyl acetate (VAc) is particularly critical. Generally speaking, VAE emulsions with a VAc content of 70% to 95% have higher viscosity. Increased VAc content will increase the flexibility and elasticity of the emulsion, and will also increase the viscosity of the emulsion.   2.Polymerization temperature control Polymerization temperature is another important factor affecting the viscosity of VAE emulsion. Changes in temperature will affect the rate of free radical generation and the rate of polymerization. Generally speaking, within a suitable temperature range, an increase in temperature will speed up the polymerization reaction, causing the latex particles in the emulsion to grow rapidly, resulting in an increase in viscosity. However, too high a temperature may cause the emulsion to gel, affecting its quality and stability.   3.Initiator The amount and type of initiator have a significant impact on the viscosity of VAE emulsions. Initiators mainly affect the rate of polymerization. When the amount of initiator is large, the polymerization reaction is fast, the number of generated latex particles increases, and the viscosity of the emulsion increases. However, excessive initiator may cause the reaction to be too fast and difficult to control, resulting in reduced emulsion performance. Different types of initiators generate different types of free radicals during the reaction and have different effects on the viscosity of the emulsion.   4. Emulsifier system optimization The selection and dosage of emulsifier are crucial to the stability and viscosity of VAE emulsion. The main function of emulsifier is to reduce the surface tension of emulsion and promote monomer dispersion and emulsion formation. Appropriate emulsifier concentration and anionic/nonionic emulsifier ratio can improve the stability of the emulsion and also affect the viscosity of the emulsion. The degree of polymerization and alcoholysis of protective colloids such as PVA (polyvinyl alcohol) also significantly affect the viscosity of the emulsion. The higher the degree of polymerization of PVA, the greater the viscosity of the emulsion; the higher the degree of alcoholysis, the lower the viscosity of the emulsion.   5.Electrolyte additives The addition of electrolyte additives can affect the viscosity and stability of VAE emulsions. Some electrolyte additives can compress the electric double layer of latex particles and reduce the electrostatic repulsion between latex particles, thereby increasing the viscosity of the emulsion. However, excessive amounts of electrolyte additives may cause aggregation in the emulsion, affecting its performance.   The factors that affect the viscosity of VAE emulsions include reaction time and rate, PH value, storage conditions and stability. In actual production and application, these factors need to be reasonably adjusted according to specific needs and conditions to obtain VAE emulsion products with excellent performance.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.

EVA is a lightweight material. Compared with other shoe materials such as rubber and leather, it is lighter in texture and has excellent softness, which can better fit the shape of the foot and make the foot feel more comfortable. Very beneficial to children's foot development. Many children's shoes are made of EVA material to provide comfort and support.   EVA shoe materials have good shock-resistant properties, which can reduce the impact on the feet during walking and running. Effectively reduce foot fatigue and protect feet from injury. It also has excellent abrasion resistance and can withstand the wear and tear of daily use. Many well-known sports shoe brands use EVA to make midsoles and insoles. Its lightweight and shock-resistant properties make sneakers more suitable for sports and workouts. EVA material also has good breathability and is also very suitable for making summer sandals.   EVA material has good waterproof properties and has good adaptability to wet and beach environments. Therefore, many beach shoes are made of EVA material, which can provide comfort and anti-slip effect in wet and sandy environments.   Manufacturing EVA shoe materials usually includes the following steps: EVA particles are usually white or transparent, and colors can be added as needed; Heat it to a molten state, and then the melted EVA is injected into the mold through an injection molding machine; The injected EVA material is further pressed and molded to obtain the final shoe material shape; The pressed shoe material needs to go through a cooling process to solidify and maintain the desired shape; Then trim to remove excess material so that it achieves the final look.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.

Polyvinyl Alcohol (PVA) film is a kind of functional material with excellent properties and wide applications. Because of its unique chemical structure and physical properties, it has been widely used in many fields. The following is a detailed introduction to the properties of polyvinyl alcohol films.   1. Good transparency: PVA film has good transparency, light transmission rate of more than 90%, so that it has a wide range of uses in optical applications, such as liquid crystal display polarizer, optical filter and so on.   2. Excellent mechanical properties: PVA film has good tensile properties and rupture resistance, with high tensile strength and elongation at break. This property makes PVA film has important applications in packaging materials, reinforced fibers and other fields.   3. Good chemical resistance: PVA film has good corrosion resistance to water and organic solvents, so that it can still maintain its physical properties in high humidity environment. This makes PVA film an ideal material for water-soluble fertilizer packaging, medicine preservation and other fields.   4. Solubility: polyvinyl alcohol film has good solubility in water and is a water-soluble polymer that can be completely dissolved. This characteristic makes PVA film can be used as water-soluble packaging film, water-soluble drug coating agent and so on.   5. Thermal stability: PVA film has a high melting point and glass conversion temperature, and can maintain good physical properties at higher temperatures. This enables the application of PVA films in high temperature environments.   6. Biocompatibility: polyvinyl alcohol film is non-toxic and harmless to the human body, has good biocompatibility and will not have any harmful effects on the human body. This makes PVA film widely used in medical devices, artificial organs and other fields.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com   ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.

VAE emulsion is a water dispersion chemical that avoids the environmental impact of solvents and unsafe hazards. Ethylene gives polymers a softness that is permanent and impervious to the environment and climate. VAE dispersions can not only be used as excellent adhesives for paper, wood, plastics, synthetic fabrics, etc., but also can be easily mixed with thickeners, surfactants, PH regulators, plasticizers, solvents, fillers and other ingredients to make adhesives for various specific use.   1. Add thickener The water-soluble polymer thickener can increase the viscosity of the continuous phase between dispersed polymer particles, thereby increasing the viscosity of VAE emulsions. Sodium polyacrylate is an effective thickening agent for VAE emulsions. When the addition amount of thickener is less than 1%, it has little effect on the stripping strength. When 7% is added, the bond strength is significantly reduced. Carboxylic butylbenzene emulsion can significantly increase the viscosity of VAE emulsion, and improve the bonding strength of PVC, PP and other substrates. However, attention should be paid to controlling the amount of addition to prevent the viscosity from being too high.   2. Add surfactants The addition of alkyl polyoxyethylene ether and other surfactants to VAE emulsions can improve the wettability of surfaces that are difficult to wet (such as PVC films, etc.). The effective concentration is 0.1-1.0% parts surfactant per 100 parts emulsion.Adhesives manufactured with VAE emulsions generally do not require the addition of defoamer. In case of foam, add 0.1 ~ 0.2% defoamer.   3. Add PH regulator VAE emulsions are generally stable in the PH range of 3.0 to 8.5. If the PH of the mixture containing VAE emulsions is adjusted below 3.0, it results in an excessively high viscosity and is hydrolyzed more rapidly in the wet state, resulting in a lower PH. When the VAE emulsion is mixed with a dispersion solvent with a completely different PH (for example, PH 9.0), the PH of the VAE emulsion should first be adjusted above 7 with an alkaline substance. To minimize the effects caused by the difference in PH. Ammonia and sodium hydroxide are commonly used PH regulators for VAE emulsions.   4. Add plasticizer and solvent The addition of plasticizers can reduce the cost of formulations. The addition of plasticizers and solvents can also improve the performance of substrates that are difficult to bond. Four plasticizers, dibutyl phthalate, butyl phenyl phthalate, dipropylene glycol phthalate and dioctyl phthalate, were added at 15% concentration to thicken CW40-705.   5. Add stuffing In VAE dispersion-based adhesives, low-cost fillers such as clay and calcium carbonate can be added as fillers or fillers. The viscosity of emulsion can be increased by adding dry filler. First dispersed with water, then a large number of fillers can be added without making the workable viscosity too high. CW40-707 can accept more fillers than other varieties.   6. Wet strength additives The water resistance of VAE emulsions generally meets the requirements. Where improvement is needed, dialdehyde, water-soluble urine aldehyde resin (UF), melamine resin (MF) or phenolic resin can be added. Excellent water resistance can be achieved by heating curing.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.    

Redispersible emulsion powder is a modified emulsion powder obtained by spray drying of a binary or ternary copolymer of vinyl acetate and tertiary vinyl carbonate -VeoVa or ethylene or acrylic ester, which has good redispersibility and is re-dispersed into emulsion when it is in contact with water, and its chemical properties are exactly the same as the initial emulsion. After mixing with the water in the mortar, it emulsifies and disperses in the water to form a stable polymerization emulsion. After dispersing in water, the water evaporates, forming a polymer film in the mortar after drying, improving the performance of the mortar. Different dispersible latex powders have different effects on the dry mortar. 1. Improve the impact resistance, durability and wear resistance of mortar The rubber powder particles fill the cavity of the mortar, the densification of the mortar is increased, and the wear resistance is improved. Under the action of external forces will produce relaxation and not be destroyed. The polymer film can exist in the mortar system for a long time.   2. Improve the bonding strength and cohesion of mortar As an organic binder, dispersible emulsion powders provide high tensile strength and bonding strength on different substrates. It plays a very important role in the adhesion between mortar and organic materials (molded plates, extruded plates) and smooth surface substrates. The film-forming polymer rubber powder is distributed in the whole mortar system as a reinforcing material to increase the cohesion of the mortar.   3. Improve the mortar's weatherability, freeze-thaw resistance and prevent mortar crackingThe RDP emulsion powder is a thermoplastic resin adhesive powder with good flexibility, which can make the mortar cope with the external cold and hot environment changes and effectively prevent the mortar from cracking due to the change in temperature difference.   4. Improve the hydrophobicity of mortar and reduce water absorptionThe RDP emulsion powder forms a film in the mortar cavity and surface, and the polymer resin film will not disperse twice after encountering water, preventing the invasion of water and improving the impermeability. Enhanced dispersible adhesive powder with hydrophobic effect has better hydrophobic effect.   5. Improve the bending strength and flexural strength of mortar The polymer film formed by dispersible emulsion powder has good flexibility. The film is formed in the gap and surface of cement mortar particles to form a flexible connection, so that the brittle cement mortar becomes elastic. The mortar added with dispersible emulsion powder has much better tensile and flexural properties than ordinary mortar.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com   ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.

A variety of adhesives with different functions and uses can be prepared from VAE emulsion and its modified emulsions. Such as PVC film adhesive, interior decoration glue, plywood glue, floor glue, wallpaper glue, wood glue, paper-plastic composite glue, PVC plastic door special glue, difficult plastic bottle label glue, carpet back glue, cigarette glue, external wall insulation board glue, non-woven adhesive, aluminum foil glue, paper tube glue, binding glue, flock glue, leather glue, paulowood glue, roof waterproof glue. Here are some typical varieties.   1. PVC film adhesive: 50 parts VAE emulsion (CW40-707), 25 parts terpene resin aqueous dispersion (TSR-5112TP), 20 parts water and 5 parts ethyl acetate. After mixing evenly, the PVC film adhesive is obtained, and the water resistance of the bonded PVC film is better than that of the acrylic emulsion adhesive.   2. Special adhesive for PVC plastic and steel skin: Mixed with VAE emulsion 40-50 parts, rosin or rosin ester emulsion 20-25 parts, DOP 1 part, toluene 3 parts to 5 parts, defoam-0.3 parts to 0.5 parts, PVC plastic and steel skin special adhesive can be prepared for the bonding of PVC plastic and steel skin with plywood or wood-based board.   3. Building decoration glue: Add a small amount of DBP, inorganic fillers (such as paste precipitated barium sulfate, etc.) and auxiliaries to VAE emulsion to produce environmentally friendly white latex. An appropriate amount of VAE emulsion can also be added to polyvinyl acetate emulsion to obtain white latex such as HL-005 white latex with faster curing, less brittleness and better water resistance.   4. Adhesive for cigarette machine: the reference formula is 55 parts VAE emulsion (CW-707), 30 parts modified monomer, mixed soap-free emulsifier 1.0 parts, DBP5 parts, additives (castor oil), butyl phosphate, ethylene glycol, defoamer (n-octanol) small amount. It is used as an adhesive for lap, joint, molding and packaging of high speed cigarette machine.   5. Plywood adhesive: It is composed of VAE emulsion, DBP, ultra-fine calcined kaolin, fumed white carbon black, etc., adding 10-15 parts of MDI before use, and mixing evenly for bonding solid wood plywood.   6. Paulownia adhesive: The general adhesive used in the joint of paulownia jointing is easy to be red, yellow and black, especially in the rainy and humid hot season. The reason for the color development of paulownia joint may be that the paulownia itself contains a color substance, when the moisture content of the bonding place is higher, the color substance migrates to the joint, resulting in color development phenomenon, resulting in unqualified product quality. Using imported VAE emulsion, polyvinyl formaldehyde adhesive liquid, dibutyl phthalate, nano-calcium carbonate, precipitated barium sulfate and other adhesive, no red cracks were found.   7. Adhesive for building exterior wall insulation board: 100 parts VAE emulsion (CW-705LH), 40 parts quartz powder, 60 parts precipitated barium sulfate, 20 parts ultrafine calcinated kaolin, mixed into paste, adding cement and appropriate amount of water before use to adjust the viscosity required. Adhesive polystyrene foam (EPS) board and concrete, strong and durable.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.

Polyvinyl alcohol (PVA) is an important polymer material. Due to its good physical properties and chemical stability, it is widely used in textile, papermaking, construction, glue and other fields. It is of great significance to study the degradation mechanism and products of PVA.   Degradation mechanism of PVA: 1. Photocatalytic degradation Photocatalysis refers to the process of using electrons generated on the surface of semiconductor materials to perform chemical reactions under the action of light. PVA can be decomposed into low molecular weight products under the action of photocatalysts. 2. Thermal degradation Thermal degradation refers to the decomposition of polymer materials into low molecular weight products due to chain breakage and oxidation reactions under high temperature conditions. PVA can undergo reaction steps such as cracking, dehydration and oxidation under high temperature conditions. 3.Biodegradation Biodegradation refers to the conversion of polymer materials into low molecular weight products through metabolic processes in organisms such as microorganisms or enzymes. PVA can be broken down into low molecular weight products through microbial metabolism.   Main degradation products of PVA: 1.Ethanol Ethanol is one of the main products of thermal degradation of PVA. It is generated due to the reaction between the hydroxyl group and the aldehyde group formed by the cleavage of the ester bond within the PVA molecule to generate alcohols. 2.Formaldehyde Formaldehyde is also one of the main products of thermal degradation of PVA. It is generated due to the reaction of the hydroxyl group formed by the cleavage of the ester bond within the PVA molecule and the aldehyde group to form ethyl formate, which is then decarboxylated to form formaldehyde. 3.Ethylene Ethylene is one of the products of photocatalytic and thermal degradation of PVA. In photocatalytic degradation, PVA will undergo chain scission after being exposed to ultraviolet light, forming hydrocarbon free radicals, and then an addition reaction will occur to generate ethylene. In thermal degradation, chain scission and dehydration reactions occur within PVA molecules under high temperature conditions, ultimately generating ethylene. 4.Carbon dioxide Carbon dioxide is one of the main products produced during biodegradation. During microbial metabolism, PVA is converted into low molecular weight products such as carbon dioxide and water. 5. Acetic acid Acetic acid is one of the main products produced during biodegradation. During microbial metabolism, PVA is converted into low molecular weight products such as acetic acid and water.   By studying the degradation mechanism and main degradation products of PVA, we can provide a theoretical basis for improving the environmental friendliness of PVA. At the same time, it can also provide reference for the research of polymer materials.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.

Into the late 1980s, High-count, lightweight wool products in the market has become a hot spot. The momentum is fast. The weight of men's fabric has been reduced by about 20% to 30%, the weight of women's fabric has been reduced by 10% to 15%, and the quality of wool has been increased from 64/66 to 66/70. For high-count lightweight products, in addition to the use of chemical fiber blending to increase the number of spinning, pure wool products use more than 70 ultrafine wool. According to the information of the International Wool Bureau, the average diameter of less than 19μm of wool production accounted for only 5.44% of the total output of Australian wool, while 20~30μm of wool production accounted for 66.6% of the total output, the price difference between the two is more than 50%. Therefore, the use of ultrafine wool spinning high-count lightweight products, not only the number of raw materials is small and expensive.   In order to solve this problem, we use a new type of polyvinyl alcohol (PVA) fiber, that is, water-soluble fiber, mixed with medium-fine wool, after finishing to remove the PVA fiber in the fabric, the same use of ultrafine wool spinning High-count, lightweight products, and the cost is low.   The removal of PVA fibers should be carried out before finishing the fabric. That is, the PVA fiber is removed in hot water first, and then other finishing. Since wool can not be treated at high temperature for a long time, the lower the dissolution temperature of the selected PVA fiber, the better, but according to the process of producing PVA fiber in the chemical fiber factory, the dissolution temperature is reduced, the fiber strength is reduced, and the spinning break is increased, and the fiber strength can meet the spinning requirements when the water solubility temperature is 70~80° C, the spinning break is low.   For the PVA fiber in the fabric, because the infiltration of water molecules is from the surface to the inside, the PVA fiber on the surface of the fabric is first dissolved, and then the PVA inside the fabric is dissolved. Removing the PVA fiber inside the fabric is more difficult than removing the loose fiber, and the water temperature must be higher than its dissolution temperature. The bath ratio is larger and longer.   PVA fiber and wool mixed spinning thin products process route: PVA fiber Strip & Wool strip - Mixed strip a pre-spinning - post-spinning → Weaving → post-finishing (removing PVA fiber)→ pure wool high-count lightweight products.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.