The cold-soluble polyvinyl alcohol (PVA) powder is a white, safe, non-toxic water-soluble polymer vinyl resin powder obtained by polymerizing, alcoholyzing, and further processing vinyl acetate. The cold-soluble polyvinyl alcohol (PVA) powder can be quickly dissolved in normal temperature water to form a stable colloid. The main models of cold water soluble PVA are GM-14S\GH-17S\GH-20S\GH-22S.
Since the cold-soluble polyvinyl alcohol has good moldability, the formed film has excellent adhesion, solvent resistance, abrasion resistance, tensile strength, and oxygen barrier property. The cold-soluble polyvinyl alcohol (PVA) powder has both hydrophilic groups and hydrophobic groups, and has strong interfacial activity. Therefore, polyvinyl alcohol can be used as a protective colloid in polymer emulsification and suspension polymerization.
Polyvinyl alcohol powder performance indicators and uses
The polyvinyl alcohol powder mainly has four kinds of particles of 1788, 2488, 0588 and 2088 as raw materials. Polyvinyl alcohol is made by using advanced technology and technology, using vinyl acetate produced by calcium carbide acetylene as raw material, methanol as solvent, azobisisobutyronitrile as initiator, and polymerization and alcoholysis. It is a water-soluble and environment-friendly polymer, non-toxic and non-polluting, with good film-forming properties, emulsifying properties, bonding properties and spinning properties. The film formed has excellent adhesion, solvent resistance, abrasion resistance, tensile strength and oxygen barrier properties. Since polyvinyl alcohol has both hydrophilic groups and hydrophobic groups, it has an interfacial activity. Therefore, polyvinyl alcohol can be used as a protective colloid for polymer emulsification and suspension polymerization.
I. Quality Index
Specifications | 17-88 | 20-88 | 0588 | 2488 |
Viscosity（mpa.s） | 20.0~26.5 | 28-40 | 4.0-6.0 | 44.0-54.0 |
Degree of acid hydrolysis[%(mol/mol)] | 86.0~90.0 | 86.0-90.0 | 86.0-90.0 | 86.0-90.0 |
Volatile matter(%) | ≤7.0 | ≤7.0 | ≤7.0 | ≤7.0 |
Sodium acetate(%) | ≤2.8 | ≤2.8 | -- | ≤2.8 |
Ash(%) | ≤0.5 | ≤0.5 | ≤1.0 | ≤1.0 |
PH value | 5 ~ 7 | 5-7 | 5-7 | 5-7 |
Degree of polymerization | 1650~1850 | 1850-2150 | 400-600 | 2300-2500 |
Molecular weight | 72600~81400 | 81400-94600 | 17600-26400 | 101200-110000 |
II. application
1. Warp syrup
The slurry prepared by PVA is the most efficient synthetic sizing agent and fabric processing agent in sizing agent. It has good adhesion to cotton, hemp, polyester, vinylon and viscose fiber. The film is colorless, transparent and tough. , wear-resistant, resistant to the sun, high mechanical strength. It can reduce the breakage rate of the cloth machine. Because of the small amount of sizing, the woven fabric has a firm feel, smooth and smooth, and the cloth surface is not rough, and can increase the number of windings. It is also easy to desizing.
PVA can also be used as a fabric finishing agent, often mixed with urea and formaldehyde. When the fabric is subjected to high-temperature baking, the chemical reaction between the two causes the resin to be more flexible, thereby improving the stiffness and elasticity of the processed fabric. The degree of stiffness of the fabric can be adjusted by the amount of PVA.
2. Paper processing
PVA has high adhesion and is strong in film formation. It can be used as a coated paper vehicle or as a glue for coated paper, wear-resistant paper, base paper, kraft paper, etc., instead of or in combination with starch and casein. Surface sizing can improve the abrasion resistance, folding resistance and tear strength of the paper, and improve gloss, smoothness and printing adaptability. The PVA aqueous solution can be used in place of water glass, starch or in combination for printing binding, carton, paperboard, paper tube, and the like.
3. Adhesive
A series of adhesives made of PVA as the main raw material. It has good adhesion to paper, cloth and wood. It has a wide range of uses, has good adhesion, water solubility, non-toxic, otherwise, in material bonding. Board, leather, decorative and other industries have a large market, and some inorganic substances such as clay, bentonite, alumina, and titanium oxide can be added to increase the bonding strength. It is also possible to develop an isocyanate-based binder which is free from formaldehyde and has high water resistance.
4. film
The film made of PVA has good transparency, strong tensile and crack resistance, good moisture permeability, good heat insulation, oil resistance, organic resistance, and no static electricity, so it is used in textile packaging. It can also be used as food packaging, non-toxic, odorless, non-polluting, degradable, and can be combined with polyethylene, polypropylene, etc., used as instrument packaging, and can also be used for printing plate making.
5. Acetalized derivative
In the presence of PVA and formaldehyde, acetaldehyde, butyraldehyde or other aldehydes or acid catalysts, acetalized PVA derivatives are formed, which further improves the water resistance and adhesion of the polyvinyl alcohol. Formaldehyde compounds are widely used in interior wall coatings, construction adhesives (such as 107 glue) sponges. The butyral compound has good adhesion to glass and the like, and can be used in coatings, leather, porcelain paper, aluminum foil, copper-clad board, safety glass, and the like.
6. Fiber raw material
PVA is washed with water, dissolved, spun, and treated with formaldehyde. It can be blended with fibers such as wool, cotton and viscose to form vinylon, non-woven fabric and geotextile. It is widely used in clothing and industrial cords. , fishing net ropes, tarpaulins, agriculture, sanitary materials, etc.
PVA can also be used to develop and manufacture high-strength high-modulus PVA fibers, which can be used as a reinforcing material for cement products instead of asbestos. In addition, it can also be used to produce water-soluble fibers, flame-retardant fibers, hollow fibers, and protein fibers.
7. Dry mortar
PVA has good film-forming properties, and the formed film has excellent adhesion and solvent resistance. It is used together with a cellulose ether water-retaining agent, which can improve the flexibility and water retention of cement mortar and gypsum building materials, and improve the adhesion of mortar. Conjunction, to a certain extent, can reduce the amount of latex powder to reduce the cost of dry mortar, it will bring a revolution to the dry mortar industry.
three. Packaging and storage
Net weight 20kg/25kg/bag. Store in a well-ventilated place away from fire, dry and cool storage for less than 5 years
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