Polyvinyl alcohol (PVA) film for packaging and preparation method thereof

A polyvinyl alcohol film and polyvinyl alcohol technology, which is applied in the chemical industry, can solve the problems of difficulty in preparing thick-walled products, complicated processes and high cost, and achieve the effect of overcoming the decline of PVA comprehensive performance and excellent comprehensive performance.

Active Publication Date: 2014-02-19
JIANGSU SHENQIAN PRINTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the application of PVA is based on the solution method, and the film material is prepared by casting a film, but the solution processing needs to go through the process of dissolution and drying, which has the disadvantages of complicated process, high cost, and low output, and it is impossible to prepare composite packaging through thermoplastic processing, and It is difficult to prepare thick-walled and complex-shaped products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take 80% polyvinyl alcohol resin, 15% modified polyvinyl alcohol, 3% 1,2-ethylene glycol, 1% silicone oil and 1% propylene glycol and mix them by weight, and stir them. Distillation method, control the temperature at 100°C to dissolve the material completely, put the mixed solution at 110°C for 1.5 hours, pour it into the flat flow mold preheated to 90°C, and cast it on the mirror steel plate at room temperature, so that the mixed solution can be rapidly cooled gel, which was peeled off from the steel plate to obtain a polyvinyl alcohol film.

Embodiment 2

[0017] Get the polyvinyl alcohol resin that is 81% by weight, 13% modified polyvinyl alcohol, 5% 1,2-ethylene glycol, 0.5% silicone oil and 0.5% methyl alcohol mix, and stir, adopt back Distillation method, control the temperature at 120°C to dissolve the material completely, put the mixed solution at 120°C for 1.5 hours, pour it into a flat flow mold preheated to 95°C, and cast it on a mirror steel plate at room temperature, so that the mixed solution can be rapidly cooled gel, which was peeled off from the steel plate to obtain a polyvinyl alcohol film.

Embodiment 3

[0019] Get 85% polyvinyl alcohol resin, 10% modified polyvinyl alcohol, 2% 1,2-ethylene glycol, 2% silicone oil and 1% ethanol to mix, and stir, and return to Distillation method, control the temperature at 130°C to dissolve the material completely, put the mixed solution at 100°C for 1 hour, pour it into the flat flow mold preheated to 90°C, and cast it on the mirror steel plate at room temperature, so that the mixed solution can be rapidly cooled gel, which was peeled off from the steel plate to obtain a polyvinyl alcohol film.

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PUM

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Abstract

The invention discloses a polyvinyl alcohol (PVA) film for packaging, which comprises the following components in percentage by weight: 80-90% of PVA resin, 5-15% of modified PVA, 1-5% of 1,2-ethylidene glycol, 0.5-2% of silicone oil and 0.5-2% of propylene glycol. The invention also discloses a preparation method of the PVA film for packaging. The modified PVA is added to obtain a wider fused processing window and implement thermoplastic processing, thereby preparing the low-cost PVA film with excellent comprehensive properties; and the invention solves the problem of degraded PVA comprehensive properties due to addition of abundant traditional modifier, and avoids many problems caused by migration of the micromolecular plasticizer.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a polyvinyl alcohol film for packaging and a preparation method thereof. Background technique [0002] Traditional high barrier packaging materials mainly include polyvinylidene chloride (PVDC), ethylene-vinyl alcohol copolymer (EVOH) and coated polyvinyl alcohol (PVA). However, PVDC contains chloride ions, and HCI gas will be generated during its processing and waste disposal, which pollutes the environment and the packaged objects. It has been restricted and stopped in Europe and the United States; the weather resistance of EVOH has not been solved yet, and the price is high. No, it is difficult to apply on a large scale; PVA is a biodegradable polymer material with excellent comprehensive properties, which can be produced on a large scale by non-petroleum route, with low price, and its oil resistance, solvent resistance and gas barrier performance are outstanding. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08K5/053C08F16/06C08F8/00C08J5/18
Inventor 李红梅东为富
Owner JIANGSU SHENQIAN PRINTING
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