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Production process of PVA (polyvinyl alcohol)-based composite packaging material

A composite packaging material and production process technology, which is applied in the field of packaging materials, can solve the problems of poor mechanical properties and water resistance of products, lower water permeability of polyvinyl alcohol base, environmental pollution, etc., achieve good crushing effect, low cost, The effect of reducing environmental pollution

Inactive Publication Date: 2014-01-29
TONGCHENG FURUN PACKAGING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method uses glutaraldehyde as the cross-linking agent of the binary matrix of stearic acid and polyvinyl alcohol, and the new polyvinyl alcohol-based coating film fresh-keeping packaging material obtained by the cross-linking reaction can significantly reduce the water permeability after the polyvinyl alcohol-based film is formed. The efficiency improves the water resistance and produces strong antibacterial properties, but the packaging materials produced by this process are non-degradable, which will undoubtedly generate a lot of garbage, cause environmental pollution, and bring inconvenience to people's lives. The mechanical properties and water resistance of the product made by the preparation method are not very good

Method used

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  • Production process of PVA (polyvinyl alcohol)-based composite packaging material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Preparation of dialdehyde starch: weigh 25g Dissolve completely in 980ml of distilled water at 21°C, then add 98g of cornstarch, stir mechanically at 36°C for 3.9 h, after the reaction is over, filter the mixture, and wash the filter cake with water repeatedly until no ions, and then washed with acetone, using a far-infrared rapid constant temperature drying oven to gradually increase the temperature and dry to obtain white dialdehyde starch;

[0017] (2) Preparation of jute fiber: put the jute fiber into YSC-701 ultrafine pulverizer, wash it 4 times with distilled water at 51°C, then stir it with 1mol / L NaOH solution at room temperature for 24 hours, and it becomes neutral after washing with distilled water. After that, wash with ethanol four times, centrifuge, and dry at 105°C for 23 h;

[0018] (3) Preparation of PVA-based composite film: uniformly disperse the dialdehyde starch prepared in step (1) in distilled water, gelatinize at 85°C for 21min, add 6g of P...

Embodiment 2

[0019] Example 2: The rest are the same as in Example 1, except that in the step (2), the distilled water is washed 5 times, and the ethanol is washed 5 times; Glycerin, the cooling time is 1h.

Embodiment 3

[0020] Example 3: The rest are the same as in Example 1, except that in the step (1), the distilled water is washed 5 times, and the ethanol is washed 5 times; in the step (3), the gelatinization temperature is controlled to be 90° C. 38g glycerin, cooling time is 1h.

[0021] After the above process steps, the PVA-based composite film sample is taken out to be tested:

[0022]

[0023] It can be seen from the above data that the elongation at break and tensile strength produced are relatively high, the elongation at break is above 90%, and the tensile strength is above 10MPa, so the mechanical properties are good. After testing, its water resistance It is also very good, with a degradation rate of over 98%, basically completely degradable, and less environmental pollution.

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Abstract

The invention discloses a production process of a PVA (polyvinyl alcohol)-based composite packaging material, relating to the field of film packaging materials. The production process comprises the following three technical processes: preparation of dialdehyde starch, preparation of jute fibers and preparation of a PVA-based composite film. According to the process method, in the preparation process of the dialdehyde starch, corn starch is used as a raw material, no pollution is caused, the cost is low, the raw material is sufficient, a far-infrared quick constant-temperature drying box is used as drying equipment, the dialdehyde starch is dried sufficiently, and no impurity is doped; in the preparation process of the jute fibers, the temperature control is reasonable, a right amount of reagent is added, the jute fibers are pulverized through a YSC-701 type ultrafine pulverizer, and the pulverized fibers are small in particle size and favorable in pulverization effect; and in the preparation process of the PVA-based composite film, parameters such as addition of each component, temperature, time and the like are strictly controlled, thereby ensuring that the prepared PVA-based composite film has favorable mechanical property and water resistance and can meet the requirements for practical production. By using the biological material as the raw material for production, the PVA-based composite film produced by the process is low in cost and degradable, thus greatly reducing environmental pollution.

Description

technical field [0001] The invention relates to the field of packaging materials, in particular to a production process of a PVA-based composite packaging material. [0002] Background technique [0003] With the advancement of science and the improvement of people's awareness of environmental protection, degradable plastics have developed from the initial cracking plastics with degradable substances to the current fully biodegradable plastics, that is, the matrix is ​​no longer polyethylene, polystyrene, etc. Non-degradable plastics, but completely degradable polyvinyl alcohol, polylactic acid, polyhydroxybutyrate and polycaprolactam, etc., the application number is CN200910027113.X discloses a new polyvinyl alcohol-based coating film fresh-keeping packaging material and its preparation process , including the concentration ratio of new materials: 3-8% of polyvinyl alcohol and water, 1-3% of stearic acid and water, 0.35-0.45 of glutaraldehyde and water, polyvinyl alcohol s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L3/10C08L97/02C08B31/18B65D65/38
CPCY02W90/10
Inventor 杨峰
Owner TONGCHENG FURUN PACKAGING MATERIAL
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