Biodegradable PVA instant film and preparation method thereof

A biodegradable, instant film technology, applied in the field of instant packaging film processing, can solve the problems of easy polycondensation, low film formation rate, and high energy consumption, to solve the water-soluble speed and polycondensation, improve the proportion of amorphous structure, reduce melting and dissolution. effect of temperature

Inactive Publication Date: 2019-06-04
安徽鼎正高分子材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They are respectively called wet method and dry method. The solution casting method has a long process flow, high energy consumption, low film formation rate, and difficult control of product quality.
The dry melt plasticizing extrusion method has simple process, low energy consumption, high output and stable quality, but the water dissolution rate of the film is not as fast as that of the wet method, and it is easy to polycondensate when it is water soluble, mainly because the dry melt extrusion is processed by longitudinal / Horizontal two-way inflation and stretching film formation, due to the influence of van der Waals force between PVA molecules and points
So far, it has not been found that dry melt extrusion can overcome the water-soluble speed and polycondensation phenomenon. The present invention has successfully solved the problem of polycondensation when water-soluble

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of biodegradable PVA instant film, the processing raw material composition of described instant film is as follows:

[0038] 65 parts of PVA with a degree of alcoholysis of 88% and a degree of polymerization of 500;

[0039] 4 parts of pre-modifier, said pre-modifier comprises water-soluble zinc salt A, mineral nucleating agent B, organic acid C and water-soluble inorganic acid D;

[0040] 15 parts of plasticizer;

[0041] 5 parts of deionized water;

[0042] 0.5 part of processing aid;

[0043] Solubilizer 0.1 part

[0044] Specifically, the PVA is a mixture of a degree of polymerization of 588 and 2488, its particle size is 60-70 mesh, the plasticizer is a compound of glycerol and ethylene glycol, and the processing aid is Zinc stearate,.

[0045] Specifically, the solubilizer is polyoxyethylene hardened castor oil, polyoxyethylene castor oil, fatty alcohol polyoxyethylene ether, fatty alcohol polyoxyethylene-polyoxypropylene ether, polyoxyethylene sorbita...

Embodiment 2

[0056] A kind of biodegradable PVA instant film, the processing raw material composition of described instant film is as follows:

[0057] 75 parts of PVA with a degree of alcoholysis of 88% and a degree of polymerization of 3000;

[0058] 6 parts of pre-modifier, said pre-modifier comprises water-soluble zinc salt A, mineral nucleating agent B, organic acid C and water-soluble inorganic acid D;

[0059] 30 parts of plasticizer;

[0060] 15 parts of deionized water;

[0061] 5 parts of processing aid;

[0062] 10 parts of solubilizer.

[0063] Specifically, the PVA is a mixture of two kinds of polymerization degrees of 888 and 2088, and its particle size is 110-120 mesh.

[0064] The plasticizer is a compound of polyethylene glycol 100 and polyethylene glycol 200.

[0065] The processing aid is magnesium stearate, the solubilizer is polyoxyethylene castor oil, and the water-soluble zinc salt is selected from zinc gluconate; the mineralogy nucleating agent is calcium-based...

Embodiment 3

[0076] A kind of biodegradable PVA instant film, the processing raw material composition of described instant film is as follows:

[0077] 70 parts of PVA with a degree of alcoholysis of 88% and a degree of polymerization of 1500;

[0078] 5 parts of pre-modifier, said pre-modifier comprises water-soluble zinc salt A, mineral nucleating agent B, organic acid C and water-soluble inorganic acid D;

[0079] 20 parts of plasticizer;

[0080] 10 parts of deionized water;

[0081] 3 parts of processing aid;

[0082] 5 parts of solubilizer.

[0083] Preferably, the PVA is a mixture of two polymerization degrees of 1088 and 1288, and its particle size is 80 mesh, and the plasticizer is a compound of polyethylene glycol 300 and polyethylene glycol 600.

[0084] The processing aid is 1-vinyl-3-ethylimidinium borate, the solubilizer is fatty alcohol polyoxyethylene ether, and the water-soluble zinc salt is selected from zinc lactate; the mineralogy nucleating agent is calcium montmo...

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Abstract

The invention relates to a biodegradable PVA instant film and a preparation method thereof. The processing materials are composed of the following ingredients: 65-75 parts of PVA with alcoholysis degree being 88% and degree of polymerization being 500-3000; 4-6 parts of a pre-modifier, which is formed by compounding of at least a water-soluble zinc salt A, a mineral nucleating agent B with at least a part dissolved in water, at least one organic acid C and at least one water-soluble inorganic acid D; 15-30 parts of a plasticizer; 5-15 parts of deionized water; 0.5-5 parts of a processing aid;and 0.1-10 parts of a solubilizer. In the raw materials of the pre-modifier, zinc salt A and the mineral nucleating agent B are the main ingredients, and the mixed acid added for modification simultaneously produces a synergistic effect, and a coordination reaction occurs to form a three-dimensional porous net structure formed by bonding of multiple active centers and multiple bridging fibers. then, the specific surface area is increased (to facilitate heat melting), presence of polyvinyl alcohol regular molecular chains is destroyed and reduced, the proportion of amorphous structures is increased, fusing and dissolving temperature of polyvinyl alcohol are also greatly reduced, and the problem of water dissolution rate and condensation polymerization is solved.

Description

technical field [0001] The invention relates to a biodegradable PVA instant film and a preparation method thereof, belonging to the technical field of instant packaging film processing. Background technique [0002] The preparation method of PVA film is film blowing by solution casting method and dry method melt extrusion method. They are respectively called wet method and dry method. The solution casting method has a long process flow, high energy consumption, low film forming rate, and difficult control of product quality. The dry melt plasticizing extrusion method has simple process, low energy consumption, high output and stable quality, but the water dissolution rate of the film is not as fast as that of the wet method, and it is easy to polycondensate when it is water soluble, mainly because the dry melt extrusion is processed by longitudinal / Horizontal two-way inflation and stretching film formation is caused by the influence of van der Waals force between PVA molec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L71/02C08K5/053C08K5/098C08K3/34C08K13/02C08J5/18
Inventor 朱鹏涛顾程松张健
Owner 安徽鼎正高分子材料科技有限责任公司
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