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Uses of Polyvinyl Alcohol

Views: 262     Author: Site Editor     Publish Time: 2023-07-17      Origin: Site


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1. Warp sizing

PVA-based slurry is the most efficient sizing agent in the synthetic sizing agent and fabric processing agent, cotton, hemp, polyester, polyvinyl chloride, viscose fibres with good adhesion, colourless and transparent film, toughness, abrasion-resistant, sunlight-resistant, high mechanical strength. It can reduce the rate of breakage of cloth machine, due to the small amount of sizing, the cloth woven into the feel of firm, smooth and delicate, the surface of the cloth is not rough, and can increase the number of winding pi, desizing is also very easy.

PVA can also be used as a fabric finishing agent, often mixed with urea, formaldehyde, when the fabric for high temperature baking and melting, the two chemical reaction, so that the resin is more flexible, thus improving the processing of fabric stiffness and elasticity. The degree of fabric stiffness can be adjusted by the amount of PVA.

2. Paper processing

Polyvinyl Alcohol adhesive force, film tough, use it instead of starch and casein or with it, can be used as a coated paper carrier colour agent, or as a glue on the surface of coated paper, wear-resistant paper, drawing paper, kraft paper, etc. Sizing can improve the paper's abrasion-resistant, folding-resistant, tear-resistant strength, to improve the glossiness, smoothness, adaptability of printing. PVA aqueous solution can be used instead of water glass, starch or and used for printing and binding, cardboard, cardboard, paper tube and other adhesive.

3. Adhesive

With PVA as the main raw material made of a series of adhesives, paper, cloth, wood has a good adhesive force, a very wide range of uses, has a very good adhesive, water-soluble, non-toxic, or else, in the material bonding plate, leather, decorative and other industries have a larger market, can be added to a number of inorganic substances, such as: clay, bentonite, alumina, titanium oxide and so on to increase the strength of the adhesive bond. Can also develop formaldehyde-free, water-resistant isocyanate-based adhesives.

4. Film

Film made of PVA, good transparency, tensile, cracking strength, moisture permeability, good insulation, oil resistance, resistance to organic drugs, without static electricity, and therefore practical for textile packaging. Can also be used as food packaging, non-toxic, odourless, non-polluting, biodegradable, in addition to polyethylene, polypropylene and other composite, used as instrument packaging, but also to do the printing plate.

5. Acetalated derivatives

PVA and formaldehyde, acetaldehyde, butyraldehyde or other aldehydes or acid catalyst in the presence of the generation of acetalised PVA derivatives, further improving the water resistance and adhesion of polyvinyl alcohol. Acetaldehyde compounds are widely used in interior paints, construction adhesives (e.g., 107 glue) sponges, and other applications. Butyral compounds have good adhesion to glass, etc., and can be used in coatings, leather, porcelain paper, aluminium foil, copper-laying plates, safety glass, etc.

6. Fibre raw materials

PVA by washing, dissolving, spinning, formaldehyde treatment of polyvinyl chloride fibre, can be blended with wool, cotton, viscose and other fibres made of polyvinyl chloride products, non-woven fabrics, geotextiles, widely used in clothing, industrial cordage, fishnet ropes, ponchos, agriculture, health materials, etc..

PVA can also be used for the development and manufacture of high-strength and high-mode PVA fibre to replace asbestos, used as reinforcing materials for cement products, the prospects are very broad. In addition, it can also be used in the manufacture of water-soluble fibres, flame retardant fibres, hollow fibres, protein fibres.

7. Dry mortar

PVA has good film-making, the formation of the film has excellent adhesion, solvent resistance, it is used in conjunction with cellulose ether water-retaining agent, they can improve the flexibility of cement mortar and gypsum building materials, water retention, improve mortar adhesion, to a certain extent, can reduce the amount of latex powder to reduce the cost of dry mortar, which will bring about a change to the dry mortar industry.

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