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A kind of thermoplastic modified polyvinyl alcohol resin and preparation method thereof

A technology for water-soluble polyvinyl alcohol resin and polyvinyl alcohol, which is applied in the field of thermoplastic carboxyl modified polyvinyl alcohol resin and its preparation, can solve the problems of reducing hydrogen bond force, incapability of thermoplastic processing, complicated modification process, etc. Improved decomposition temperature, good formability, and environmental protection

Active Publication Date: 2018-08-31
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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  • A kind of thermoplastic modified polyvinyl alcohol resin and preparation method thereof
  • A kind of thermoplastic modified polyvinyl alcohol resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: 60 parts of carboxy-modified polyvinyl alcohol (this carboxy-modified polyvinyl alcohol is obtained through alcoholysis after the copolymerization of vinyl acetate monomer and itaconic acid monomer, its alcoholysis degree is 95mol%, polymerization degree 1600, carboxyl content is 10mol%), 8 parts of polyethylene glycol, 2 parts of triethylene glycol diisocaprylate, 9 parts of soft water, and 2 parts of erucamide are mixed evenly under stirring, and stirred at a temperature of 90 ° C While heating, stop heating after 10min. 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 carboxyl-modified high-temperature water-soluble polyvinyl alcohol resin was prepared by cutting into pellets with a granulator.

[0036] The obtained resin has a decomposition tem...

Embodiment 2

[0037] Example 2: 70 parts of carboxyl-modified polyvinyl alcohol (this carboxyl-modified polyvinyl alcohol is obtained through alcoholysis after copolymerization of vinyl acetate monomer and itaconic anhydride, and its degree of alcoholysis is 99mol%, and the degree of polymerization is 2000 , the carboxyl content is 12mol%), 18 parts of polyethylene glycol, 15 parts of soft water, and 8 parts of erucamide are mixed, mixed evenly under stirring, heated while stirring at a temperature of 30 ° C, and stopped heating after 6 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 120°C, melt and extrude under the pressure of 0.01MPa (gauge pressure), and then cool the material Temperature to 20°C, pelletizing by a pelletizer to obtain a thermoplastic carboxyl-modified high-temperature water-soluble polyvinyl alcohol resin.

[0038] The decomposition temperature o...

Embodiment 3

[0039] Example 3: 85 parts of carboxyl-modified polyvinyl alcohol (the carboxyl-modified polyvinyl alcohol is obtained by alcoholysis after copolymerization of vinyl acetate monomer and acrylic acid, the degree of alcoholysis is 98mol%, the degree of polymerization is 3500, the carboxyl group The content is 2mol%), 40 parts of triethylene glycol diisocaprylate, 20 parts of soft water, 13 parts of silicon dioxide, 2 parts of erucamide, mix well under stirring, and heat while stirring at 50°C for 3h Then stop heating. Then put the material into the silo with stirring, and use single screw to automatically transport the material to the single-screw extruder, keep the screw temperature at 170°C, melt and extrude under normal pressure, and then cool the material to 30°C, The thermoplastic carboxyl-modified high-temperature water-soluble polyvinyl alcohol resin is obtained by cutting into pellets with a pelletizer.

[0040] The decomposition temperature of the obtained resin is 350...

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Abstract

The invention discloses thermoplastic modified polyvinyl alcohol resin. The thermoplastic modified polyvinyl alcohol resin comprises an effective amount of carboxyl-modified polyvinyl alcohol, a plasticizer, soft water and a processing auxiliary agent. The carboxyl-modified polyvinyl alcohol is obtained by copolymerization of a vinyl acetate monomer and an unsaturated monomer containing carboxyl and then alcoholysis and has an alcoholysis degree of 95-99.9(mol)%, a polymerization degree of 1000-3500 and carboxyl content of 0.1-20mol%. The plasticizer is at least one of glycerol, polyethylene glycol and triethylene glycol di-2-ethylhexoate. The processing auxiliary agent is at least one of talcum powder, silica, erucyl amide and saturated aliphatic dicarboxylic acid ester. The thermoplastic carboxyl-modified high temperature water soluble polyvinyl alcohol resin has a melting temperature of 120-200 DEG C and a decomposition temperature of 300 DEG C or more, can be dissolved in water at a temperature of 80-90 DEG C, is colorless and transparent, does not produce yellowing and has excellent 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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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08F218/08C08F8/00C08K5/053C08K5/103C08K3/34C08K3/36C08K5/20C08K5/11B29B9/06B29C47/92B29C48/92
Inventor 吴春林黎园吴永忠雷德松李宇虹
Owner 重庆川维科技有限公司