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Thermoplastic modified polyvinyl alcohol resin and preparation method therefor

A technology of water-soluble polyvinyl alcohol resin and polyvinyl alcohol, which is applied in the field of thermoplastic carboxy-modified polyvinyl alcohol resin and its preparation, can solve the problems of reducing hydrogen bond force, complicated modification process, and difficult industrialization, etc. The effect of resin product quality, good compatibility, and high strength of film or profile

Active Publication Date: 2016-03-30
重庆川维科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The introduction of a relatively large amount of comonomer can effectively reduce the hydrogen bond force in polyvinyl alcohol molecules, and clearly separate the melting temperature from the decomposition temperature, such as EVOH resin, but the modification process is complicated and industrialization is difficult
In the existing production process of polyvinyl alcohol, a small amount of modified monomer is introduced in the polymerization process, and the melting temperature is lowered, but it still cannot be processed separately

Method used

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  • Thermoplastic modified polyvinyl alcohol resin and preparation method therefor
  • Thermoplastic modified polyvinyl alcohol resin and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: 85 parts of carboxy-modified polyvinyl alcohol (this carboxy-modified polyvinyl alcohol is obtained through alcoholysis after copolymerization of vinyl acetate monomer and itaconic acid monomer, and its degree of alcoholysis is 80 (mol) % , the degree of polymerization is 3500, and the carboxyl content is 20mol%), 20 parts of polyethylene glycol, 20 parts of glycerin, 20 parts of soft water, 15 parts of saturated fatty acid group dicarboxylate G60 are mixed under stirring state, at 30 ℃ Heating while stirring under temperature, stop heating after 10h. Then put the material into the silo with stirring, use the screw to automatically transport the material to the screw extruder, keep the screw temperature at 200°C, melt and extrude under normal pressure, then cool the material to 40°C, and cut The thermoplastic carboxy-modified polyvinyl alcohol resin was obtained by granulating and molding with a granulator.

[0036] The decomposition temperature of the obtai...

Embodiment 2

[0037] Example 2: 52 parts of carboxy-modified polyvinyl alcohol (this carboxy-modified polyvinyl alcohol is obtained through alcoholysis after copolymerization of vinyl acetate monomer and itaconic anhydride, and its degree of alcoholysis is 90 (mol) %, polymerization degree is 1000, carboxyl content is 9mol%), 5 parts of glycerin, 7 parts of soft water, 0.1 part of silicon dioxide, 0.1 part of erucamide, mixed evenly under stirring, and heated while stirring at a temperature of 90 ° C. After 10 minutes the heat was turned off. Then put the material into the silo with stirring, use the screw to automatically transport the material to the single-screw extruder, keep the screw temperature at 120°C, melt and extrude under the pressure of 0.01MPa (gauge pressure), and then cool the material to 20°C, and then pelletized and molded by a pelletizer to obtain a thermoplastic carboxyl-modified polyvinyl alcohol resin.

[0038] The decomposition temperature of the obtained thermoplast...

Embodiment 3

[0039] Example 3: 65 parts of carboxyl-modified polyvinyl alcohol (this carboxyl-modified polyvinyl alcohol is obtained through alcoholysis after the copolymerization of vinyl acetate monomer and acrylic acid, and its degree of alcoholysis is 85 (mol)%, and the degree of polymerization is 2000, carboxyl content is 0.1mol%), 28 parts of triethylene glycol diisocaprylate, 13 parts of soft water, 5 parts of talcum powder, 5 parts of saturated fatty acid group dicarboxylate G36 mix, mix under stirring state, in Heat at 60°C while stirring, and stop heating after 2 hours. Then put the material into the silo with stirring, and use a single screw to automatically transport the material to the single-screw extruder, keep the screw temperature at 150°C, melt and extrude it under normal pressure, and then cool the material to 30°C, The thermoplastic carboxy-modified polyvinyl alcohol resin is obtained by pelletizing with a pelletizer.

[0040] The obtained thermoplastic carboxy-modifie...

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Abstract

The invention relates to thermoplastic carboxyl-modified normal-temperature-water-soluble polyvinyl alcohol resin. The polyvinyl alcohol resin is prepared from an effective quantity of carboxyl-modified polyvinyl alcohol, plasticizer, soft water and processing aid, wherein the carboxyl-modified polyvinyl alcohol is prepared through copolymerizing a vinyl acetate monomer and a carboxyl-containing unsaturated monomer and then carrying out alcoholysis and has the alcoholysis degree of 80.0-90.0(mol)%, the polymerization degree of 1,000-3,500 and the carboxyl content of 0.1-20mol%, the plasticizer is at least one of glycerol, polyglycol and triglycol diisooctoate, and the processing aid is at least one of talcum powder, silicon dioxide, erucyl amide and saturated aliphatic dicarboxylic ester. The prepared thermoplastic carboxyl-modified polyvinyl alcohol resin has the melting temperature of 120-200 DEG C, is soluble to water of 5-30 DEG C, has the decomposition temperature above 300 DEG C, is colorless and transparent, is free of yellowing and is excellent in quality.

Description

technical field [0001] The invention relates to a modified polyvinyl alcohol resin, in particular to a thermoplastic carboxy-modified polyvinyl alcohol resin and a preparation method thereof. Background technique [0002] Polyvinyl alcohol (PVA) is a polymer material with excellent performance and a wide range of uses. Because polyvinyl alcohol has the structural characteristics of polyhydric groups and strong hydrogen bonds, it has many excellent properties and is widely used in coatings, adhesives, etc. agent, paper sizing agent and other fields. The use of polyvinyl alcohol resin to prepare films or profiles is a new direction for the application of polyvinyl alcohol resins. Films or profiles made of PVA have excellent oxygen resistance, oil resistance, no static electricity, no dust absorption, and high strength. And under certain conditions, it has water solubility and biodegradability. Therefore, the film or profile made of polyvinyl alcohol is expected to play an imp...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08L71/08C08K13/02C08K5/053C08K5/103C08K3/34C08K3/36C08K5/20C08K5/10C08F218/08C08F222/02C08F8/00B29B9/06B29C47/92B29C48/92
Inventor 吴春林黎园廖永康胡腊梅吴晓黎
Owner 重庆川维科技有限公司
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