Shaanxi BLOOM Tech Co., Ltd. is one of the most experienced manufacturers and suppliers of polyvinyl alcohol powder cas 9002-89-5 in China. Welcome to wholesale bulk high quality polyvinyl alcohol powder cas 9002-89-5 for sale here from our factory. Good service and reasonable price are available.
Polyvinyl alcohol powder is an organic compound with the chemical formula of [C2H4O]n, and its appearance is a powder solid and tasteless. Soluble in water, slightly soluble in dimethyl sulfoxide, insoluble in gasoline, kerosene, vegetable oil, benzene, toluene, dichloroethane, carbon tetrachloride, acetone, ethyl acetate, methanol, ethylene glycol, etc. Polyvinyl alcohol is an important chemical raw material, which is used to manufacture polyvinyl acetal, gasoline resistant pipeline and vinylon, fabric treatment agent, emulsifier, paper coating, adhesive, glue, etc. It is used as an emulsion stabilizer for polyvinyl acetate lotion polymerization. It is used to manufacture water-soluble adhesive. Used as modifier of starch adhesive. It can also be used to prepare photosensitive adhesive and sealant resistant to benzene solvent. Also used as release agent, dispersant, etc.
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Polyvinyl Alcohol (PVA) is a non-toxic and odorless polymer material that has shown extensive potential in various fields due to its unique physical and chemical properties.
Healthcare field
Polyvinyl alcohol powder plays an important role in the healthcare field, mainly reflected in the following aspects:
Ophthalmic medication: Polyvinyl alcohol, as a common component in ophthalmic medications, has excellent hydrophilicity and film-forming properties. At an appropriate concentration, it can simulate the function of artificial tears, forming a thin and stable moisturizing film on the surface of the eyeball. It is often used to relieve irritating symptoms such as eye dryness, foreign body sensation, and eye fatigue caused by prolonged use of electronic devices, dry environments, or eye diseases, and can effectively improve eye dryness symptoms. As a safe ophthalmic lubricant, polyvinyl alcohol can reduce friction between the eyeball and eyelid, significantly improving the comfort of patients during use without causing irritation to the ocular surface.
Medical gel and ointment: Polyvinyl alcohol is widely used as a matrix material to make medical gels and ointments. These products are clinically applicable to the treatment of skin wounds, burns, scalds, and other skin injuries. The good moisturizing and repairing properties of polyvinyl alcohol can lock in skin moisture, reduce water loss from the wound surface, create a favorable environment for wound healing, and help promote the regeneration of skin tissue while reducing scar formation. In addition, its non-toxic, odorless, and non-irritating properties ensure safe use on the skin, even for patients with sensitive skin or long-term use.
Surgical sutures: Some specially processed polyvinyl alcohol fibers can be used as surgical sutures, thanks to their good biocompatibility and biodegradability. This type of suture can be gradually degraded and absorbed by the human body after surgery, without the need for a second operation to remove the suture. This not only simplifies the post-operative care process but also greatly reduces the pain and discomfort of patients, while avoiding the risk of infection caused by suture removal.
Pure water production
Polyvinyl alcohol plays a crucial role in the production of purified water. Pure water without any harmful substances can be prepared by utilizing the properties of polyvinyl alcohol through distillation or other methods. This type of water has a good taste and health benefits, and is suitable for multiple fields such as drinking, pharmaceuticals, electronics, etc. The filtration and separation function of polyvinyl alcohol helps to remove impurities and microorganisms from water, ensuring the safety and purity of water quality.
Paint manufacturing
Polyvinyl alcohol is one of the important components in coating manufacturing. It can provide waterproof, anti fouling, and corrosion-resistant performance while maintaining transparency and glossiness. This has led to the widespread application of polyvinyl alcohol coatings in various fields such as construction, automobiles, and ships. The film-forming and adhesive properties of polyvinyl alcohol help to form a uniform and dense coating on the substrate, improving the durability and aesthetics of the coating.
Food packaging
Polyvinyl alcohol also plays an important role in the field of food packaging. It can be used to make packaging materials such as bottle caps and plastic bags for bottled beverages. The high barrier properties of polyvinyl alcohol can protect food from the effects of oxygen, moisture, and microorganisms, extending the shelf life of food. Meanwhile, its non-toxic and odorless characteristics ensure the safety and hygiene of food. With the increasing awareness of food safety and environmental protection among consumers, the application prospects of polyvinyl alcohol in the field of food packaging will be even broader.
Optical device manufacturing
Polyvinyl alcohol also exhibits unique advantages in the manufacturing of optical devices. It can be used to manufacture products such as optical lenses, lenses, and optical fibers. Due to its low refractive index and small dispersion, polyvinyl alcohol is suitable for manufacturing high-quality optical equipment. These optical devices have a wide range of applications in communication, medical, scientific research, and other fields, helping to improve the performance and stability of optical systems.
Textile industry applications
In the textile industry, polyvinyl alcohol is mainly used in the sizing process. It can be used together with acrylic pulp and other materials to pulp high count pure cotton yarn, improving the strength and wear resistance of the yarn. Meanwhile, polyvinyl alcohol can also be used to manufacture vinylon fibers, which are synthetic fibers with excellent properties. Vinylon fiber has the characteristics of high strength, high modulus, and wear resistance, and is suitable for making various textiles and clothing.
Application in the construction industry
Polyvinyl alcohol powder is also widely used in the construction industry. It can be used as an important raw material for building adhesives and binders, and is used to manufacture putty adhesives, coating adhesive base materials, etc. These adhesives play an important role in the construction industry, helping to improve the adhesion and durability of building materials. In addition, polyvinyl alcohol can also be used to manufacture materials such as waterproof membranes and protective pads for waterproofing and protective engineering in buildings.
Application in the paper industry
In order to improve the wear resistance, tear resistance, and folding resistance of paper, surface sizing agents, pigment binders, and pulping machine additives made of polyvinyl alcohol are widely used in the papermaking industry. These additives can significantly improve the quality and performance of paper, making it more suitable for various printing, writing, and packaging purposes.
Application in the field of new energy
With the rapid development of green energy, polyvinyl alcohol has also begun to show great potential in the field of new energy. For example, it can be used to manufacture PVB film, which can be used to make car windshields as well as bulletproof glass in military applications. In addition, polyvinyl alcohol can also be used in the field of encapsulation materials for solar panels, which helps to improve the efficiency and stability of solar panels.
Other applications
In addition to the aforementioned fields, polyvinyl alcohol also has the following common applications:
Cleaning agents and lubricants: Polyvinyl alcohol has good lubricity and cleanliness, and can be used to make cleaning agents, lubricants, and other products. These products are widely used in various fields such as home and industry, helping to improve cleaning efficiency and smooth equipment operation.
Artificial leather and synthetic leather: Polyvinyl alcohol can be used as a coating material for the production of synthetic leather and synthetic leather. These materials have the characteristics of softness, wear resistance, and easy cleaning, and are suitable for making various footwear, bags, furniture, and other products.
In the field of water treatment, polyvinyl alcohol can also be used as a flocculant, adsorbent, and other materials. These materials can remove suspended solids, organic matter, and other impurities from water, improving the safety and cleanliness of water quality.
Ink and printing industry: Polyvinyl alcohol is also used in the ink and printing industry. It can serve as an adhesive or dispersant for ink, improving the adhesion and printing effect of the ink.
Polyvinyl alcohol, as a multifunctional polymer material, has shown a wide range of application prospects in healthcare, purified water production, coating manufacturing, food packaging, optical device manufacturing, textile industry, construction industry, papermaking industry, new energy field, and many other fields. With the advancement of technology and the increasing demand for material properties, the application fields of polyvinyl alcohol will continue to expand and deepen.
Preparation method of polyvinyl alcohol
1. Raw material route:
Polyvinyl alcohol powder (PVA) is made from vinyl acetate (VAc) through polymerization and alcoholysis. There are usually two raw material routes for PVA production. One is to prepare vinyl acetate from ethylene, and then prepare polyvinyl alcohol; The other is to use acetylene (including calcium carbide acetylene and natural gas acetylene) as raw materials to prepare vinyl acetate, and then prepare polyvinyl alcohol.
2. Preparation of polyvinyl alcohol by alcoholysis:
Polyvinyl alcohol can not be obtained directly through monomer polymerization, but is prepared by alcoholysis or hydrolysis of its ester polyvinyl acetate. Because the PVA produced by alcoholysis is easy to refine, with high purity and good performance of the main product, alcoholysis is widely used in industry.
The alcoholysis of polyvinyl alcohol powder can be carried out under acidic or alkaline conditions. The alcoholysis reaction under acidic conditions is difficult to remove the trace acid from PVA, and the residual acid can accelerate the dehydration of PVA, making the product yellow or insoluble in water. Therefore, the alkaline alcoholysis method is currently used to prepare PVA.
Alcoholysis reaction under alkaline condition can be divided into wet method and dry method, that is, high alkali method and low alkali method.
Wet alcoholysis:
The process is that the methanol solution of the raw material polyvinyl acetate contains 1%~2% water, and the catalyst base is also prepared into an aqueous solution with a large alkali molar ratio. The high alkali method has the advantages of fast alcoholysis speed and high production capacity of equipment. The disadvantages are that there are many side reactions and more sodium acetate is generated, which requires recovery equipment. The content of sodium acetate in polyvinyl alcohol products is high, resulting in low purity of polyvinyl alcohol and high ash content, affecting the internal quality of products.
Dry alcoholysis:
The water content of polyvinyl acetate methanol solution is less than 1%, which is almost alcoholysis without water, and the alkali mole ratio is small. The outstanding advantage of the low alkali method is that the consumption of sodium hydroxide is only one tenth of that of the high alkali method when the low alkali molar ratio is used, with fewer side reactions and less by-product sodium acetate. The disadvantage is that the alcoholysis speed is slow, and the sodium acetate in the polyvinyl alcohol product is not easy to wash off because of its compact structure. Due to the advantages of low alkali alcoholysis, it has become the main method to produce polyvinyl alcohol.
FAQ
What is PVA powder used for?
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PVA acts as a superior coating and binding agent in paper production, boosting strength, grease resistance, and printability. It's also used in biodegradable films and barrier coatings for eco-friendly packaging solutions.
How to create PVA?
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Heat 1 liter of tap water to 88–90 °C (194 °F) or just under the boiling point of water. Once the water is heated, lightly sprinkle the polyvinyl alcohol into the water while stirring continuously (a magnetic stirrer/hot plate works well to heat and stir the solution).
Is PVA FDA approved?
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PVA is approved safe by the FDA for food packaging, is considered a GRAS ingredient by the FDA, and has biomedical and pharmaceutical applications as well (1,2,3).
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