Re-introduction of pharmaceutical grade excipient polyvinyl alcohol film-forming EG with registration approval

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Pharmaceutical grade polyvinyl alcohol is used in the manufacture of polyvinyl acetal, gasoline-resistant pipes and vinylon synthetic fibers, fabric treatments, emulsifiers, paper coatings, adhesives, etc.
A water-soluble polyvinyl alcohol fiber and its preparation method, which is characterized in that the polyvinyl alcohol with degree of polymerization and alcoholysis is mixed with a mixed solvent of dimethyl sulfoxide/water: , add it to a stainless steel dissolving kettle, dissolve it under stirring at a temperature of ℃ and a pressure of ~ hours, and prepare a spinning solution. After filtration, degassing, dry and wet spinning and post-processing, water-soluble polyvinyl alcohol fiber is obtained. The fiber The water solution temperature is ~℃, the strength is /, the single fiber fineness is ~, and the elongation at break is ~. The filaments are processed into tops, which are blended with wool slivers, cotton slivers, hemp and chemical fibers to make high-count yarn or hollow yarn, or cut into short pieces. Fibers are used for various purposes in non-woven fabrics, embroidery base fabrics and paper making.
It has the following excellent properties
Solubility: It is soluble in water. The higher the water temperature, the greater the solubility, but it is almost insoluble in organic solvents. Solubility varies with the degree of alcoholysis and polymerization. Partial alcoholysis and low degree of polymerization dissolve very quickly, while complete alcoholysis and high degree of polymerization dissolve slowly. As a general rule, the degree of alcoholysis has a greater impact on solubility than the degree of polymerization. The dissolution process is carried out in stages, namely affinity wetting-swelling-infinite swelling-dissolution.
Film-forming properties: It is easy to form a film, and its film has excellent mechanical properties. The tensile strength of the film increases with the increase in the degree of polymerization and alcoholysis.
Adhesion and hydrophilic cellulose have good adhesion. Generally speaking, the higher the degree of polymerization and alcoholysis, the stronger the bonding strength.
When the heat-stable powder is heated to about ℃, its appearance gradually changes. Partial alcoholysis begins to melt at around ℃ and decomposes at ℃. Complete alcoholysis begins to melt at around ℃ and decomposes at ℃. Thermal cracking experiments show that the lower the degree of polymerization, the faster the weight loss; the higher the alcoholysis degree, the shorter the decomposition time.
Developing new pharmaceutical excipients and promoting dosage form optimization is one of the current strategic tasks for China's traditional Chinese medicine development to integrate with international standards. It has the characteristics of convenient synthesis, safety and low toxicity, easy control of product quality, cheap price and convenient use. Therefore, it is an excellent pharmaceutical excipient with potential for re-development
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Minimum order with production license registration approval document


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