The application of PVA :
1. Fabric and fabric processing:
Due to the high adhesion between molecules, PVA has good drawing and film forming properties, and has established the status of PVA as a raw material for vinylon fiber.
Vinylon fibers made of PVA can be blended with cotton, wool, viscose or purely for the production of clothing and tarpaulins, cords, ropes, etc. It is an ideal substitute for asbestos.
The water-soluble fiber developed in recent years has water solubility, acid resistance, alkali resistance, organic solvent resistance, and good salt and chemical resistance. It can be dissolved in different water temperatures as needed, and its waste liquid is activated sludge. After treatment, it is completely degraded and pollution-free. It is an environmentally friendly material with great application prospects and wide use.
Water-soluble fiber is mainly used as a raw material for papermaking, a raw material for non-woven fabrics, a water-soluble yarn or a high-grade textile blended with other fibers, and a textile material for making military products.
Fabric processing has the largest demand for PVA, and the scope of use is roughly as follows: slurry – warp yarn, printing paste, fabric finishing; modifier – fabric resin finishing; adhesive – adhesive for felt and non-woven fabric.The ratio used as the warp yarn slurry in the above application is the largest. PVA is an ideal low-cost warp yarn that enhances the warp cohesion, sizing strength, abrasion resistance, flexibility, and protection against changes in atmospheric conditions.
2. Paper Processing :
PVA is mainly used in the paper industry for surface sizing agents, pigment binders and beater additives. Paper surface sizing agent made of PVA can enhance the surface strength and internal tension of the paper, crack resistance, folding and abrasion resistance, improve the gloss and smoothness of the paper, and improve the water resistance, oil resistance and organic solvent resistance of the paper. . Because the PVA aqueous solution has strong adhesion to paper and good film-forming property, it can replace the expensive and easy-corrupted casein to make pigment adhesive. The coated paper has good whiteness and gloss, is not easy to curl, and has low cost. There are a wide range of uses for fine paper such as art paper and craft paper.
3. Films and products:
PVA aqueous solutions have good film forming properties, and PVA films have many different properties from other plastic films. There are many types of PVA films, such as soft films for fiber packaging, ionic films for molding such as polyester, water-soluble films, and films for food packaging.
PVA film has excellent performance as a packaging material: excellent transparency and gloss; no dust, no static electricity, good printing adaptability; high tensile strength and elongation, good wear resistance; low humidity, Excellent gas barrier and aroma retention, oxygen barrier even better than ethylene-vinyl alcohol copolymer (EVOH), and polyvinylidene chloride (PVDC); like EVOH, it has high moisture permeability and is sensitive to water; Good metal evaporation, thermal adhesion; excellent oil resistance, radiation resistance, can be used for radiation-resistant food packaging; soluble in water, hydrolyzable, biodegradable, hydrolyzed, degraded and incinerated in water It is an internationally recognized environmentally friendly material for CO2 and H2O.
The new formulation and process of polyvinyl alcohol film developed by Polyval of the United Kingdom can significantly reduce the cost of extruding polyvinyl alcohol film Enpol. It is said that the conventional polyvinyl alcohol film is produced by a solution casting process, and the processing cost is very high. Now, the Enpol film is produced by Enpol resin extrusion blow molding, and the melting point of Enpol resin is lower than the decomposition temperature of polyvinyl alcohol (about 180 ° C). The company has produced and supplied Enpol resin and transferred film production technology. It has developed 10 grades. The processed film is soluble in water at different temperatures between 5 and 70 ° C for drainage system and can be used within three months. Biodegradable.
Polarizing films for liquid crystal displays (LCDs) are important electronic chemicals, and the world’s demand is growing rapidly. The polarizing film is produced by stretching and combining a polyvinyl alcohol film and a triacetyl cellulose (TAC) film layer. The film can be taken by large roll pressing. The productivity of the polarizing film device can be improved by relaxing the rolling size. Kuraray is a leading producer of polyvinyl alcohol film. In order to meet the growing demand, Kuraray has nearly nearly doubled its optical polyvinyl alcohol film production capacity in 2005.
How to make PVA polymer into pellets ?
You need twin screw extruder from Kerke Extrusion Equipment Company
Using twin screw extruder line with air cooling strands pelletizing line . Liquid materials using Liquid filling pump. Here is the picture.
Post by shelley
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