Modified polyvinyl alcohol and preparation method thereof

A polyvinyl alcohol, modification technology, applied in the field of modified polyvinyl alcohol and its preparation, can solve the problems of difficult industrialization, lower melting temperature, escape modification system, etc., and achieve easy industrialization and high thermal stability , The effect of simple process

Active Publication Date: 2013-08-28
江苏道成不锈钢管业有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] To sum up, the modification method of copolymerization modification requires high equipment and technology, and it cannot be modified for ordinary PVA products that have been commercialized in large quantities; there are also some technical bottlenecks in the blending modification method. The compatibility of plasticizers has not been completely resolved, and it is difficult to realize industrialization; while the method of solution plasticization generally only reduces the melting temperature, and because ordinary plasticizers are easy to vaporize under high-temperature melting conditions, they escape the modified system and pollute the production environment. Negative impact on material composition and processing

Method used

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  • Modified polyvinyl alcohol and preparation method thereof
  • Modified polyvinyl alcohol and preparation method thereof
  • Modified polyvinyl alcohol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Dissolve 100 grams of PVA1799 in 900 grams of dimethyl sulfoxide, the dissolution temperature is 90 ° C, and the time is 4 hours, called solution A, cooled to room temperature for later use; in addition, 10 grams of hyperbranched In methyl sulfoxide, the dissolution temperature is 80°C, and the time is 2 hours. It is called solution B, and it is cooled to room temperature for later use; then take 100 grams of solution A and 20 grams of solution B, stir and mix evenly, and the PVA1799 in the final mixed solution The mass concentration is 8.33%, the hyperbranched polymer is 10% by weight of polyvinyl alcohol, and dried in an oven at 100° C. for 12 hours to obtain film-shaped modified polyvinyl alcohol, which can be crushed or used directly according to actual processing.

Embodiment 2

[0040] Get 100 grams of solution A and 1 gram of solution B in Example 1, stir and mix evenly, the mass concentration of PVA1799 in the mixed solution is 9.90%, and the hyperbranched polymer is 0.5% by weight of polyvinyl alcohol, in an oven at 100 ° C After drying for 12 hours, the film-shaped modified polyvinyl alcohol can be obtained, which can be successfully prepared by crushing or directly using according to actual processing.

Embodiment 3

[0042] Get 100 grams of solution A and 40 grams of solution B in Example 1, stir and mix evenly, the mass concentration of PVA1799 in the mixed solution is 7.14%, and the hyperbranched polymer is 20% of the weight of polyvinyl alcohol. Dry for 12 hours in medium to obtain film-shaped modified polyvinyl alcohol, which can be crushed or used directly according to actual processing

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Abstract

The invention relates to a modified polyvinyl alcohol and a preparation method thereof. The preparation method of the modified polyvinyl alcohol can reduce a polyvinyl alcohol melting point and improve a polyvinyl alcohol thermal decomposition temperature. The preparation method of the modified polyvinyl alcohol comprises the following steps of dissolving polyvinyl alcohol and hyperbranched polymers in at least one solvent to obtain a uniform mixed solution, and removing the at least one solvent to obtain the modified polyvinyl alcohol, wherein mass concentration of polyvinyl alcohol in the uniform mixed solution is in a range of 0.1 to 40%; the mass of the hyperbranched polymers is 0.5 to 20% of that of polyvinyl alcohol; and one or more hyperbranched polymer hydroxyl groups are selectedfrom a carboxyl group, an ester group, an amino group or an amido group. The preparation method provided by the invention has simple processes, is suitable for industrialization, realizes mixing of polyvinyl alcohol and the hyperbranched polymers at a molecular level in the presence of a solvent, and thoroughly changes an original aggregation structure of a polyvinyl alcohol (PVA) molecular chainso that high thermal stability of polyvinyl alcohol is obtained.

Description

technical field [0001] The invention relates to a modified polyvinyl alcohol and a preparation method thereof. Background technique [0002] Polyvinyl alcohol (polyvinyl alcohol, PVA) is a general-purpose polymer material with excellent performance and a wide range of uses. It is used in the plastic product processing industry, as well as textiles, adhesives, paper and other fields. As far as PVA is concerned, because its main chain contains a large number of hydroxyl groups, a large number of hydrogen bonds are formed between molecules and within molecules, there are many physical cross-linking points, and the density is high, resulting in the melting temperature of PVA close to the decomposition temperature, without obvious melting point, heating to 200 ° C The color above starts to change, and it begins to decompose at 240-250°C, and violently decomposes at 300°C, so PVA cannot be processed by conventional melting methods. However, the solution processing molding process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08L67/04C08L77/12C08L79/02C08L75/04
Inventor 刘加平阳知乾刘建忠周华新李长风
Owner 江苏道成不锈钢管业有限公司
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