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Polyvinyl alcohol material suitable for melt processing and preparation method thereof

A polyvinyl alcohol and melt processing technology, applied in the field of preparation of polyvinyl alcohol materials, can solve problems such as incompatibility and plasticizer toxicity, and achieve the effects of low cost, lower melting temperature, and improved melt processing characteristics

Inactive Publication Date: 2012-01-18
贵州省复合改性聚合物材料工程技术研究中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the plasticizer selected by this method has certain toxicity, so that the prepared material is not suitable for food packaging materials.

Method used

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  • Polyvinyl alcohol material suitable for melt processing and preparation method thereof
  • Polyvinyl alcohol material suitable for melt processing and preparation method thereof
  • Polyvinyl alcohol material suitable for melt processing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 of the present invention: Preparation of melt-processable polyvinyl alcohol material, calculated by weight, 95 parts of polyvinyl alcohol (polyvinyl alcohol has a degree of alcoholysis of 88%, a degree of polymerization of 1500, and a brand of 1588 ) And 5 parts of calcium chloride are fully mixed in the mixer; add the mixture into the twin-screw extruder, the extrusion temperature is 185℃, the screw speed of the twin-screw extruder is 200rpm, and the mixture is extruded. Cut pellets to obtain modified polyvinyl alcohol materials.

Embodiment 2

[0021] Example 2 of the present invention: Preparation of melt-processable polyvinyl alcohol material, calculated in parts by weight, 90 parts of polyvinyl alcohol (the degree of alcoholysis of polyvinyl alcohol is 88%, the degree of polymerization is 500, and the brand is 1588 ) And 1 part of lithium chloride are fully mixed in the mixer; add the mixture into the twin-screw extruder, the extrusion temperature is 170℃, the screw speed of the twin-screw extruder is 100rpm, and the mixture is extruded. Cut pellets to obtain modified polyvinyl alcohol materials.

Embodiment 3

[0022] Example 3 of the present invention: Preparation of melt-processable polyvinyl alcohol material, calculated in parts by weight, 100 parts of polyvinyl alcohol (the degree of alcoholysis of polyvinyl alcohol is 88%, the degree of polymerization is 1700, and the grade is 1750 ) And 3 parts of calcium chloride are fully mixed in the mixer; add the mixture into the twin-screw extruder, the extrusion temperature is 200 ℃, the screw speed of the twin-screw extruder is 200 rpm, and the mixture is extruded. Cut pellets to obtain modified polyvinyl alcohol materials.

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Abstract

The invention discloses a polyvinyl alcohol material suitable for melt processing, which comprises 90-100 parts of polyvinyl alcohol and 1-5 parts of calcium chloride or lithium chloride. According to the invention, by adding calcium chloride or lithium chloride in polyvinyl alcohol, the polyvinyl alcohol material is prepared by melt blending in common plastic processing equipment. Calcium chloride or lithium chloride can reduce intermolecular force of polyvinyl alcohol, decrease the melting temperature, facilitate the improvement of the melt processing characteristics of polyvinyl alcohol, and make the melt processing be realized better; the method adopted by the invention has the advantages of simplicity, environmental protection, low cost, and easy industrialization, and the prepared polyvinyl alcohol material can meet the requirements for food packaging industry and the like.

Description

Technical field [0001] The invention relates to a preparation method of a polyvinyl alcohol material, in particular to a polyvinyl alcohol material which can be processed by melt blending and a preparation method thereof. Background technique [0002] Polyvinyl alcohol (PVA) is a hydrophilic polymer synthesized through a non-petrochemical route. With the depletion of petroleum resources, its advantages are becoming increasingly apparent. In addition, polyvinyl alcohol has the structural characteristics of polyhydroxyl and strong hydrogen bonds, which endows it with excellent oxygen resistance, oil resistance, wear resistance, tear resistance, transparency, antistatic, and chemical corrosion resistance. It is used in coatings, adhesives, etc. Glue, fiber and other industries. However, the melting point of polyvinyl alcohol is very high, which is very close to the decomposition temperature, and is prone to thermal decomposition during melting, which makes it impossible to easily p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08K3/16B29B9/06B29C47/92B29C48/92
Inventor 张敏敏秦舒浩刘辉吴丹华于杰何敏
Owner 贵州省复合改性聚合物材料工程技术研究中心
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