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Thermoplastic modified polyvinyl alcohol resin and preparation method thereof

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, complicated modification process, etc., and achieves Resin has good lubricity, good formability, and excellent mechanical properties

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 thereof
  • Thermoplastic modified polyvinyl alcohol resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: 60 parts of carboxyl-modified polyvinyl alcohol (this carboxyl-modified polyvinyl alcohol is obtained by alcoholysis after copolymerization of vinyl acetate monomer and itaconic acid monomer, and its alcoholysis degree is 95 mol%, polymerization degree 1600, carboxyl content is 10mol%), 8 parts of polyethylene glycol, 2 parts of triethylene glycol diisocaprylate, 9 parts of soft water, 2 parts of erucamide are mixed evenly under stirring, and stirred at a temperature of 90 °C While heating, stop heating after 10min. Then add 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 ℃, melt and extrude under normal pressure conditions, and then cool the material to 40 ℃, after cutting The thermoplastic carboxyl modified high-temperature water-soluble polyvinyl alcohol resin was prepared by pelletizing and molding with a pelletizer.

[0036] The obtained resin has...

Embodiment 2

[0037] Embodiment 2: 70 parts of carboxyl-modified polyvinyl alcohol (this carboxyl-modified polyvinyl alcohol is obtained by alcoholysis after copolymerization of vinyl acetate monomer and itaconic anhydride, its alcoholysis degree is 99 mol%, and the degree of polymerization is 2000 , the carboxyl group content is 12mol%), 18 parts of polyethylene glycol, 15 parts of soft water, 8 parts of erucic acid amide are mixed, mixed evenly under stirring, heated while stirring at 30 ° C, and stopped heating after 6 minutes. Then add 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. At 20°C, the thermoplastic carboxyl group-modified high-temperature water-soluble polyvinyl alcohol resin is obtained by pelletizing by a pelletizer.

[0038] The obtained resin has a decomposition tempe...

Embodiment 3

[0039] Embodiment 3: 85 parts of carboxyl-modified polyvinyl alcohol (this carboxyl-modified polyvinyl alcohol is obtained by alcoholysis after copolymerization of vinyl acetate monomer and acrylic acid, its alcoholysis degree is 98mol%, the degree of polymerization is 3500, the carboxyl group content of 2mol%), 40 parts of triethylene glycol diisocaprylate, 20 parts of soft water, 13 parts of silicon dioxide, 2 parts of erucamide, mixed evenly under stirring, and heated while stirring at 50°C for 3h Then stop heating. Then add the material into the silo with stirring, use the single screw to automatically transport the material to the single screw extruder, keep the screw temperature at 170 ℃, melt and extrude under normal pressure conditions, and then cool the material to 30 ℃, Thermoplastic carboxyl modified high temperature water-soluble polyvinyl alcohol resin was prepared by pelletizing by pelletizer.

[0040] The obtained resin has a decomposition temperature of 350°C,...

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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 carboxyl modified polyvinyl alcohol resin and a preparation method thereof. Background technique [0002] Polyvinyl alcohol (PVA) is a kind of polymer material with excellent performance and wide application. Due to the structural characteristics of polyhydroxyl and strong hydrogen bonds, polyvinyl alcohol 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. The films or profiles prepared from PVA have the advantages of excellent oxygen resistance, oil resistance, no static electricity, no dust absorption, and high strength. And under certain conditions, it is water-soluble and biodegradable. Therefore, the film or profile prepared from polyvinyl alcohol is also...

Claims

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Application Information

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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
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