[Chemical Knowledge]：Properties, uses, upstream and downstream raw materials, storage methods, and what are the uses of polyvinyl acetate

Polyvinyl acetate properties

Polyvinyl acetate (Polyvinyl Acetate, PVA) is an important synthetic polymer material. It has excellent adhesion, transparency and film-forming properties, and has certain water resistance, oil resistance and chemical resistance. The ester group in its molecular structure makes it have good flexibility and elasticity, and the glass transition temperature (Tg) is usually between 30 and 40 ° C., which makes it show good flexibility at normal temperature. PVA has poor stability to light and heat, and is susceptible to degradation under the influence of ultraviolet rays and high temperature, so it is necessary to pay attention to its environmental conditions during application.

Polyvinyl acetate uses

Polyvinyl acetate is widely used in industry and daily life. Its main uses include:

1. Adhesive :PVA is often used in the manufacture of white latex, wood glue, paper adhesives. Its excellent adhesion makes it an ideal adhesive for materials such as paper, wood and fabrics.

2. Paints and coatings :PVA is widely used in the coating industry. As the base material of coatings, it can improve the toughness and gloss of the coating film and provide good protective properties.

3. Textile and paper: In the textile industry, PVA is used as a slurry and finishing agent to enhance the wrinkle resistance and abrasion resistance of fabrics; in the paper industry, PVA is used as a surface sizing agent for paper to improve the surface properties and printing adaptability of paper.

4. Latex products :PVA emulsion is widely used in the production of latex paint, latex gloves and other latex products, providing excellent flexibility and durability.

5. Plastic modifier :PVA can be used as a plastic modifier to improve the toughness and transparency of plastic products and improve their processing performance.

Polyvinyl acetate upstream and downstream raw materials

Upstream raw materials

The main raw material of PVA is vinyl acetate monomer (Vinyl Acetate Monomer, VAM). VAM is synthesized by gas phase oxidation of ethylene, acetic acid and oxygen in the presence of a catalyst. The raw materials for VAM production mainly include ethylene and acetic acid:

1. Ethylene: Ethylene is a product of oil and gas cracking and is the basic feedstock for VAM production.

2. Acetic acid: Acetic acid is mainly produced by methanol carbon-based synthesis and acetic acid fermentation.

Downstream Products

As a multifunctional polymer material, PVA has a wide range of downstream products, covering many industries. Common downstream products include:

1. Adhesives and sealants: used in packaging, construction, woodworking, book binding and other fields.

2. Coatings and paints: used in architectural coatings, furniture coatings, industrial coatings, etc.

3. Textiles: used for fabric sizing and finishing agent, improve the performance of the fabric.

4. Paper products: used for paper sizing and coating, improve the strength and surface properties of paper.

Polyvinyl acetate storage method

Due to the chemical and physical properties of PVA, the following points need to be paid attention to during storage:

1. Ambient temperature and humidity :PVA should be stored in a cool, dry, well-ventilated environment, away from direct sunlight and high temperature and humidity. The appropriate storage temperature is 15-25 ℃, and the relative humidity should be kept below 50% to prevent PVA from moisture absorption and deterioration.

2. Package sealing :PVA should keep the package sealed during storage to prevent hydrolysis or degradation caused by contact with air. Commonly used packaging materials include plastic bags, paper bags and metal drums.

3. Fire and explosion -proof: Although PVA is not flammable, it may decompose under high temperature or open fire conditions to produce toxic gases. Therefore, the storage site should be equipped with fire-proof equipment, away from fire and heat sources.

4. Prevent mechanical damage: avoid mechanical damage such as heavy pressure, drop and friction during storage and handling, so as not to affect the physical properties and use effect of PVA.

Market Analysis and Future Development

The market demand for polyvinyl acetate is growing steadily, thanks to its wide range of applications and excellent performance. With the enhancement of environmental awareness, water-based PVA emulsion has gradually become the mainstream of the market because of its low volatile organic compound (VOC) content and environmental protection characteristics. PVA has broad application prospects in the fields of construction, packaging, textiles and coatings. In the future, with the development of new catalysts and process technologies, the production cost of PVA will be further reduced, and its market competitiveness and application fields will be further expanded.

Conclusion

As an important synthetic polymer material, polyvinyl acetate has attracted much attention because of its excellent performance and wide application prospect. Through in-depth understanding of its nature, use, upstream and downstream raw materials and storage methods, it can better play its role in various fields and promote its market development and technological progress. In the future, with the improvement of environmental protection requirements and the application of new technologies, the PVA market will usher in more opportunities and challenges.