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Fusion preparation method of polyvinyl alcohol film

A polyvinyl alcohol film and polymer technology, used in flat products, applications, household appliances, etc., can solve problems such as unsatisfactory film tensile or tear strength, chemical reagent contamination of packaging, and failure to meet strength requirements, etc. To achieve a wide range of applications, improve mechanical properties, reduce the effect of melting processing temperature

Inactive Publication Date: 2012-02-01
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the film prepared in this way is placed for a period of time, the problem of plasticizer precipitation on its surface will occur, so that when it is used for product packaging, the precipitated chemical reagents will pollute the packaged objects, and too much plasticizer will cause The tensile or tear strength of the film is not ideal, and even the strength requirements in some film applications cannot be met

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] First mix 10 parts of ethylene glycol and 2 parts of nano-silica in a blender, and then mix the mixture with 9 parts of ethylene-vinyl acetate copolymer, 5 parts of stearic acid and 100 parts of polyvinyl alcohol with the brand number 0588 Add it into a high-speed mixer, mix well at a stirring temperature of ≤80°C, then put the premix into a twin-screw extruder, melt and plasticize it at a temperature of 140-180°C and a screw speed of 125rpm, and directly extrude it to prepare a film or After granulation, melt, plasticize and extrude at 140-180° C. at a screw speed of 125 rpm to prepare a film.

[0035] The obtained film is water-soluble at room temperature, has a tensile strength of 48 MPa, an elongation at break of 300%, and a visible light transmittance of 92%.

Embodiment 2

[0037] First mix 10 parts of water, 15 parts of glycerin, and 5 parts of nano-calcium carbonate in a blender, and then mix the mixture with 3 parts of 0588 polyvinyl alcohol, 3 parts of ethylene bisstearamide and 100 parts of grade 1788 Add polyvinyl alcohol into a high-speed mixer, mix well at a stirring temperature of ≤80°C, and then put the premix into a twin-screw extruder, melt and plasticize it at a temperature of 180-230°C and a screw speed of 200rpm for direct extrusion After preparing a film or granulating, melt and plasticize and extrude to prepare a film at 180-230° C. and a screw speed of 200 rpm.

[0038] The obtained film is water-soluble at room temperature, has a tensile strength of 45 MPa, an elongation at break of 280%, and a visible light transmittance of 92%.

Embodiment 3

[0040]First mix 15 parts of glycerol, 30 parts of diethylene glycol, and 0.01 parts of nano-aluminum hydroxide in a blender, and then mix the mixture with 9 parts of ethylene-acrylic acid copolymer, 1 part of acrylate core-shell copolymer and 100 parts Add one part of polyvinyl alcohol with brand number 1799 into a high-speed mixer, and mix well at a stirring temperature of ≤80°C, then put the premix into a twin-screw extruder, and melt it at a temperature of 140-250°C and a screw speed of 50rpm Plasticizing direct extrusion to prepare film or pelletizing and then melting and plasticizing and extruding to prepare film at 140-250°C and screw speed 50rpm.

[0041] The obtained film is water soluble at high temperature, has a tensile strength of 65 MPa, an elongation at break of 220%, and a visible light transmittance of 90%.

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Abstract

The invention discloses a fusion preparation method of a polyvinyl alcohol film, which comprises the steps of mixing 100 parts by weight of polyvinyl alcohol, 10-45 parts by weight of small molecular plasticizer, 3-15 parts by weight of polymeric plasticizer, 1-5 parts by weight of processing agent, and 0.01-5 parts by weight of inorganic nanofiller, putting the components into a double-screw extruder, and fusing and plasticizing at the temperature of 140-250 DEG C and the screw rotate speed of 50-200rpm to directly extrude to form films or extrude to form films via fusing and plasticizing after pelleting. By choosing reasonable small molecular and polymeric compound plasticizers and inorganic nanofillers, the invention effectively reduces the fusing processing temperature of PVA, and solves the fusing processing problem of polyvinyl alcohol which has high molecular weight and high alcoholysis degree and is difficult to dissolve in water at normal temperature, and the obtained film has high transparency and good mechanical properties, is environmental-friendly, is non-toxic, and can be used for packaging a variety of products.

Description

technical field [0001] The invention belongs to the technical field of preparation of polyvinyl alcohol films, and in particular relates to a melting preparation method of polyvinyl alcohol films. Background technique [0002] Polyvinyl alcohol (PVA) is a polymer material that can be synthesized through non-petrochemical routes. Now, with the depletion of petroleum resources, its advantages are becoming increasingly apparent. In addition, polyvinyl alcohol has the structural characteristics of multiple hydroxyl groups and strong hydrogen bonds, endowing it with many excellent properties, and is widely used in coatings, adhesives, fibers and other industries. The use of polyvinyl alcohol resin for the preparation of films is a new direction for the application of polyvinyl alcohol resin. Experts predict that the global average annual growth rate of PVA film will reach 8-10% in the next few years. [0003] Polyvinyl alcohol is an ideal film material. Compared with other film...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08L71/00C08L23/08C08K5/053C08K5/21C08K5/3492C08K5/09C08K5/10C08K3/24C08K3/26C08K3/22C08K3/36C08K3/34B29D7/01
Inventor 陈弦周乐何波兵
Owner SICHUAN UNIV
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