Method for synthesizing glucose modified polyvinylalcohol resin

A polyvinyl alcohol resin, polyvinyl alcohol technology, applied in the direction of adhesives, etc., can solve the problem of not being able to completely remove aldehydes, and achieve the effect of improving mechanical properties

Inactive Publication Date: 2010-06-16
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No matter which method can not achieve the purpose of complete removal of aldehydes ("China Adhesives" new formula for preparing polyvinyl acetal adhesive)

Method used

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  • Method for synthesizing glucose modified polyvinylalcohol resin
  • Method for synthesizing glucose modified polyvinylalcohol resin
  • Method for synthesizing glucose modified polyvinylalcohol resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Put 20 parts of polyvinyl alcohol (1799) and 80 parts of water into the pressure reactor, stir at 90℃~95℃ for 1~2 hours, make the polyvinyl alcohol completely dissolve in the water, and prepare 20% polyethylene Alcohol solution, then cool to 80℃ and add 44 parts of anhydrous glucose (the mass ratio of polyvinyl alcohol, water and glucose is 1:4:2.2, the molar ratio of polyvinyl alcohol hydroxyl group and glucose is 2:1), while stirring While adding a mixed acid with a mass fraction of 1.5% of the total mass of the system as a catalyst, the mixed acid is concentrated hydrochloric acid and concentrated phosphoric acid with a mass ratio of 1:2. After the catalyst is uniformly dispersed, the reaction temperature is increased to 90°C and the acetalization reaction is carried out for 2 hours The product is then neutralized to neutrality to obtain an aqueous solution of polyvinyl dextrose modified resin adhesive. Then it is cooled, salted out and dried to obtain an acetalized r...

Embodiment 2

[0037] According to Example 1, only the mass ratio of polyvinyl alcohol, water and glucose was changed to 1:9:2.2 to prepare a 10% polyvinyl alcohol aqueous solution, the mass ratio of mixed acid concentrated hydrochloric acid and concentrated phosphoric acid was 1:1, and the reaction temperature At 80°C, the reaction time is 1 hour, and the acetal degree of the obtained polyvinyl alcohol glucose modified resin is 25.2%. The softening point and tensile strength performance of the prepared acetalized resin samples were tested. The results are shown in Table 1.

Embodiment 3

[0039] According to Example 1, only the mass ratio of polyvinyl alcohol, water and glucose was changed to 1:19:1.44 to prepare a 5% polyvinyl alcohol aqueous solution, the mass ratio of mixed acid concentrated hydrochloric acid and concentrated phosphoric acid was 1:1, and the reaction temperature At 100°C, the reaction time was 2 hours, and the obtained polyvinyl alcohol glucose thermoplastic resin had an acetal degree of 31.5%. The softening point and tensile strength performance of the prepared acetalized resin samples were tested. The results are shown in Table 1.

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Abstract

The invention provides a method for synthesizing glucose modified polyvinylalcohol resin, relating to a synthesis method for a chemical material and comprising the following steps: taking gluecose and polyvinylalcohol water solution as raw materials, and obtaining a thermoplastic polyvinyl alcohol / gluecose acetalation resin product under the action of acidic catalyst after salting-out, drying and dehydrating, wherein the product has the structural formula as follows. The acetalization product prepared by the invention has the advantages of good hygroscopicity and water solubility at room temperature, enhances the application prospect thereof and broadens the application fields of polyvinyl alcohol; and the value of the softening point thereof conforms to the user performance of the thermoplastic glue.As resin has the advantages of free of methanol, safety and stability, no toxicity, no pollution, no volatilization, excellent natural degrading property and the like, the resin has important actual meanings in the aspects of recycling, reducing environment pollution, lowering production cost and the like.

Description

Technical field [0001] The invention relates to a method for synthesizing chemical materials, in particular to a method for synthesizing a glucose modified polyvinyl alcohol resin adhesive. Background technique [0002] Polyvinyl alcohol is a water-soluble polymer commonly used at home and abroad. Its molecules have a highly ordered hydroxyl structure, and molecular aggregates contain a large number of hydrogen bonds, so the intermolecular force is strong and the crystallinity is high, making the melting temperature close to the decomposition temperature, making it difficult to perform thermoplastic processing and application. The acetalization reaction of polyvinyl alcohol has long been widely used in adhesives and coatings industries, mainly using formaldehyde, acetaldehyde and butyraldehyde to acetalize polyvinyl alcohol, and the obtained polyvinyl acetal has good properties. Broad application prospects. However, as the degree of acetalization of polyvinyl alcohol increases,...

Claims

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Application Information

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IPC IPC(8): C08F16/06C08F8/28C08F16/38C09J129/14
Inventor 封禄田王晓波王思林
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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