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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, impossibility of thermoplastic processing, and difficulty in industrialization, etc., and achieves decomposition Increased temperature, good formability, and good compatibility

Active Publication Date: 2016-04-27
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: 70 parts of carboxyl-modified polyvinyl alcohol (this carboxyl-modified polyvinyl alcohol is obtained through alcoholysis after copolymerization of vinyl acetate monomer and itaconic acid monomer, and its degree of alcoholysis is 92 (mol) % , the degree of polymerization is 2200, and the carboxyl content is 12mol%), 28 parts of triethylene glycol diisocaprylate, 2 parts of glycerol, 15 parts of soft water, 5 parts of saturated fatty acid family dicarboxylic acid ester G32, 2 parts of erucamide Mix well under stirring state, heat at 44°C while stirring, stop heating after 3h. 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 135°C, melt and extrude under normal pressure, then cool the material to 25°C, and cut The thermoplastic carboxy-modified polyvinyl alcohol resin was obtained by granulating and molding with a granulator.

[0036] The obtained therm...

Embodiment 2

[0037] Example 2: 80 parts of carboxy-modified polyvinyl alcohol (this carboxy-modified polyvinyl alcohol is obtained through alcoholysis after the copolymerization of vinyl acetate monomer and itaconic anhydride, and its degree of alcoholysis is 94 (mol) %, polymerization degree is 3500, carboxyl content is 17mol%), 10 parts of glycerol, 16 parts of polyethylene glycol, 18 parts of soft water, 5 parts of silicon dioxide, 9 parts of erucamide are mixed, and mixed evenly under stirring, at 90 ℃ temperature while stirring while heating, stop heating after 30 minutes. 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 200°C, melt and extrude the material under the pressure of 0.01MPa (gauge pressure), and then cool the material To 40 ℃, through pelletizer pelletizing and molding to obtain thermoplastic carboxy-modified polyvinyl alcohol resin.

[0038] The obtained t...

Embodiment 3

[0039] Example 3: 55 parts of carboxy-modified polyvinyl alcohol (this carboxy-modified polyvinyl alcohol is obtained through alcoholysis after copolymerization of vinyl acetate monomer and butyl acrylate, and its degree of alcoholysis is 93 (mol) %, polymerized degree is 2800, carboxyl content is 0.5mol%), 7 parts of triethylene glycol diisocaprylate, 8 parts of soft water, 0.8 parts of silicon dioxide, 0.2 parts of erucamide, mix evenly under stirring, at 35 ℃ Heating while stirring at low temperature, and stopping heating after 6h. 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 180°C, melt and extrude it under normal pressure, and then cool the material to 20°C, The thermoplastic carboxy-modified polyvinyl alcohol resin is obtained by pelletizing with a pelletizer.

[0040] The obtained thermoplastic carboxy-modified polyvinyl alcohol resin has a d...

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Abstract

The invention relates to thermoplastic carboxyl-modified medium-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 90.0-95(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 40-60 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): C08L29/04C08L29/00C08L71/08C08K13/02C08K5/103C08K5/053C08K5/10C08K5/20C08K3/36C08K3/34C08K5/098C08F218/08C08F222/02C08F8/00
Inventor 黎园吴春林吴永忠胡腊梅王小玲
Owner 重庆川维科技有限公司
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