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Melt processable polyvinyl alcohol material and method for preparing same

A polyvinyl alcohol and melt processing technology, which is applied in the field of preparation of polyvinyl alcohol materials, can solve the problems of toxicity of alcohol amine plasticizers, reduce the plasticizing temperature of polyvinyl alcohol, resin foaming, etc., so as to improve melt processing. Characteristics, low cost, brittleness improvement effect

Inactive Publication Date: 2016-04-06
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the stability of this preparation method is not good in actual production. In addition, there is a large amount of water in the system, which makes the extruded resin prone to foaming, resulting in the inability to uniformly form the film.
[0005] Chinese patent ZL01131081 discloses a self-made alcohol amine plasticizing modifier, which can reduce the plasticizing temperature of polyvinyl alcohol and realize the melt preparation of water-soluble polyvinyl alcohol materials, but the patent’s self-made Alcohol amine plasticizers are also toxic

Method used

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  • Melt processable polyvinyl alcohol material and method for preparing same
  • Melt processable polyvinyl alcohol material and method for preparing same
  • Melt processable polyvinyl alcohol material and method for preparing same

Examples

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Effect test

Embodiment 1

[0024] The preparation of the melt-processable polyvinyl alcohol material is calculated in parts by weight, with 95 parts of polyvinyl alcohol (the degree of alcoholysis of polyvinyl alcohol is 88%, the degree of polymerization is 1500, and the grade is 1588), 1 part of calcium chloride Fully mix with 5 parts of EAA in the mixer; put the mixed material into the twin-screw extruder, the extrusion temperature is 185 ° C, the screw speed of the twin-screw extruder is 200rpm, and the mixed material is extruded and then pelletized. That is, a modified polyvinyl alcohol material is obtained.

Embodiment 2

[0026] The preparation of the melt-processable polyvinyl alcohol material is calculated in parts by weight, with 90 parts of polyvinyl alcohol (the degree of alcoholysis of polyvinyl alcohol is 88%, the degree of polymerization is 500, and the brand is 0588), 1.8 parts of calcium chloride and 10 parts of EAA are fully mixed in the mixer; the mixed material is added to the twin-screw extruder, the extrusion temperature is 170 ° C, the screw speed of the twin-screw extruder is 100 rpm, and the mixed material is extruded and pelletized. That is, a modified polyvinyl alcohol material is obtained.

Embodiment 3

[0028] The preparation of the melt-processable polyvinyl alcohol material is calculated in parts by weight, with 80 parts of polyvinyl alcohol (the degree of alcoholysis of polyvinyl alcohol is 88%, the degree of polymerization is 1700, and the brand is 1788), 20 parts of EAA and 1.6 Parts of calcium chloride are fully mixed in the mixer; the mixture is added to the twin-screw extruder, the extrusion temperature is 200 ° C, the screw speed of the twin-screw extruder is 200rpm, the mixture is extruded and pelletized, That is, a modified polyvinyl alcohol material is obtained.

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Abstract

The invention discloses a melt-processable polyvinyl alcohol material, which comprises the following components by weight: 70-95 parts of polyvinyl alcohol (PVA), 0.75-5 parts of calcium chloride, and 5-25 parts of ethylene-acrylic acid copolymer (EAA). The preparation method comprises adding EAA and calcium chloride into PVA, and preparing the PVA material by melt blending with ordinary plastic processing equipment. Firstly, EAA and calcium chloride can weaken the intermolecular forces of PVA, reduce melting temperature of PVA, and help to improve the melt-processing characteristics of PVA to improve the melt processing. Secondly, the method has the advantages of being simple and convenient, environment friendly, low in cost and suitable for industrialization. The polyvinyl alcohol material prepared with the method can meet the requirements of the food packaging industry.

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 water-soluble polymer obtained by alkali-catalyzed alcoholysis of polyvinyl acetate. The physical properties of polyvinyl alcohol are greatly affected by its chemical structure, degree of alcoholysis, and degree of polymerization. The degree of polymerization of polyvinyl alcohol is generally divided into ultra-high degree of polymerization (molecular weight 250,000-300,000), high degree of polymerization (molecular weight 170,000-220,000), medium degree of polymerization (molecular weight 120,000-150,000) and low degree of polymerization (2.5-3.5 Ten thousand). There are generally three types of alcoholysis degrees: 78%, 88%, and 98%. The alcoholysis degree of partial alcoholysis is usually 87%-8...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08L23/08C08K3/16B29C47/92B29C48/92
CPCB29C48/40
Inventor 张艺张敏敏许家瑞刘四委池振国
Owner SUN YAT SEN UNIV
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