Stretched PVA (polyvinyl alcohol) film and preparation method for same

A stretch film and film technology, applied in the field of PVA stretch film and its preparation, can solve the problems of low production efficiency, high energy consumption, complicated process, etc., and achieve the effects of improved production efficiency, good water resistance and simple process

Inactive Publication Date: 2012-07-25
朱春英
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention solves the technical problems of high energy consumption, low production efficiency, complex process and production of special equipmen...

Method used

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Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0025] Specific embodiment one: in this embodiment, PVA (polyvinyl alcohol) stretched film is single-layer or three-layer structure, and described single-layer structure is B; Described three-layer structure is A / B / A or B / A successively / B; the material of the A layer is polylactic acid, polycaprolactone, polybutylene succinate, polyhydroxyalkanoate, or carbon dioxide polymer; the material of the B layer includes 40~ 85 parts of polyvinyl alcohol, 15-30 parts of plasticizer, 0.1-5 parts of catalyst, 0.1-5 parts of initiator, 0.05-5 parts of rare earth stabilizer and 5-30 parts of monomer.

[0026] The preparation method of the single-layer PVA stretched film in this embodiment is carried out according to the following steps: weigh 40-85 parts of polyvinyl alcohol, 15-30 parts of plasticizer, 0.1-5 parts of catalyst , 0.1 to 5 parts of initiator, 0.05 to 5 parts of rare earth stabilizer and 5 to 30 parts of monomer, melted, plasticized, extruded and granulated to obtain granule...

specific Embodiment approach 2

[0033] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the layer B material also includes 0.1 to 5 parts of additives by weight, and the additives are lubricants, blocking agents, flow agents, coloring agents, etc. agent, absorbent, hydrophobic agent, anti-hydrolysis agent and nanoscale inorganic powder or a mixture of several of them.

[0034] In this embodiment, when the auxiliary agent is a mixture, various auxiliary agents are mixed in any ratio.

[0035] The lubricant can be trimethylolpropane, zinc stearate, calcium stearate or magnesium stearate, etc.

[0036] The opening agent can be oleic acid amide, erucic acid amide, polyethylene wax or polyamide wax, etc.

[0037] The flow agent can be SP-16 or SP-30 (Shanghai Songya), etc.

[0038] The colorant can be directly orange, blue, brown, red, green or yellow, etc.

[0039] The absorbent can be SW-100 or sw120 (Guangdong Foshan Yite Environmental Protection Technology Co....

specific Embodiment approach 3

[0043] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is that the polyvinyl alcohol is polyvinyl alcohol with alcoholysis degree ≥ 88, viscosity ≥ 20, polymerization degree 1700-2700 and molecular weight 500000-150000 . Others are the same as in the first or second embodiment.

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Abstract

A stretched PVA (polyvinyl alcohol) film and a preparation method for the same belong to the field of high polymer packaging materials, and aim to solve the problems of high energy consumption, low production efficiency, complicated process and special equipment production during processing with water serving as solvent in the prior art. The stretched PVA film is of a monolayer structure or three-layer structure, wherein the monolayer structure refers to B, and the three-layer structure sequentially refers to A/B/A or B/A/B. The method includes the steps of melting plasticization, extrusion granulation, and uniaxial stretching or biaxial stretching so that the stretched PVA film is obtained. The stretching melting range of the stretched PVA film is from 160 DEG C to 240 DEG C. The stretched PVA film meets national standard of biological degradability, and the degradation ratio is larger than or equal to 70%. The stretched PVA film is high in water resistance, and the swelling ratio of the stretched PVA film soaking in water at the temperature of 23 DEG C for 48 hours is smaller than or equal to 120%.

Description

technical field [0001] The invention belongs to the field of polymer packaging materials; in particular, it relates to a PVA stretched film and a preparation method thereof. Background technique [0002] It is well known that polyvinyl alcohol (hereinafter referred to as PVA) is a completely biodegradable material, and the importance of environmental protection has been generally recognized by people. Western Europe, North America, and some developed countries have banned plastic from the road, so people have developed Artificially synthesized degradable and environmentally friendly resins such as polylactic acid, polycaprolactone, and polybutylene succinate play a positive role in the application and development of these materials, but these materials are very expensive and thus limit their development. scale. [0003] According to the desire for high-quality and low-cost environmental protection materials at home and abroad, the inventor has worked hard for many years to ...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08L67/04C08L67/02C08L69/00C08F261/04B32B27/08B32B27/18
Inventor 朱煜锋高习芳朱仁贵朱宝贵
Owner 朱春英
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