Starch-modified polyvinylalcohol high-resistance degradable thin film and preparing method

A technology for modifying polyvinyl alcohol and starch, which is applied in the field of starch-modified polyvinyl alcohol high-barrier degradable film. Solve the problems of low mechanical properties of the film, achieve the effect of improving mechanical properties, reducing the decline of mechanical properties and barrier properties, and expanding the melt processing window

Inactive Publication Date: 2016-05-11
西安艾菲尔德复合材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a starch-modified polyvinyl alcohol high-barrier degradable film, which solves the technical problems of low mechanical properties and poor barrier properties of the polyvinyl alcohol degradable film prepared by melting processing in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The preparation method of the above-mentioned starch-modified polyvinyl alcohol high barrier degradable film comprises the following steps:

[0020] Step 1: Modification of starch, adding starch to an aqueous oxidant solution with a concentration of 0.08-0.10 g / mL, the mass ratio of starch to oxidant is 1:0.20-1:0.30, and adjusting the solution to be neutral, at 35-40 Stir at ℃ for 4-6 hours to form a starch slurry; filter with suction and wash with water until the water does not contain oxidants to obtain modified starch;

[0021] Step 2: Composition of 60-75wt% polyvinyl alcohol, 10-20wt% oxidant-modified starch, 5-15wt% plant fiber, 1-5wt% natural polyphenol, 0-1wt% calcium oxide The polyvinyl alcohol composition is fully mixed, and vacuum-dried;

[0022] Step 3: Melt extrusion, the polyvinyl alcohol composition is melt-extruded, the extrusion temperature is 205°C-220°C, cooled, and pelletized to obtain starch-modified polyvinyl alcohol granules;

[0023] Step 4: F...

Embodiment 1

[0028] Add cornstarch to sodium periodate aqueous solution with a concentration of 0.08 / mL, the mass ratio of cornstarch to sodium periodate is 1:0.20, adjust the solution to be neutral, stir at 35°C for 4h to form starch slurry; filter with suction 1. Washing with water until the water does not contain sodium periodate to obtain modified starch.

[0029] Take by weighing 69g polyvinyl alcohol, 20g cornstarch modified by sodium periodate, 5g jute fiber, 5g natural polyphenols, 1g calcium oxide, fully mix above-mentioned materials to obtain polyvinyl alcohol composition, and vacuumize and dry;

[0030] The polyvinyl alcohol composition is melt-extruded at an extrusion temperature of 205°C, cooled, and pelletized to obtain starch-modified polyvinyl alcohol granules;

[0031] The above-mentioned starch-modified polyvinyl alcohol granules were added to a film blowing unit for blow molding, and the film blowing temperature was 175° C. to obtain a starch-modified polyvinyl alcohol h...

Embodiment 2

[0034] Add barley starch to an aqueous solution of hydrogen peroxide with a concentration of 0.09 / mL, the mass ratio of barley starch to oxidant hydrogen peroxide is 1:0.25, adjust the solution to be neutral, stir at 38°C for 5 hours to form a starch slurry; filter with suction and wash with water until The water does not contain hydrogen peroxide to obtain modified starch;

[0035] Weigh 61.5g of polyvinyl alcohol, 20g of barley starch modified by hydrogen peroxide, 15g of flax fiber, 3g of natural polyphenols, 0.5g of calcium oxide, fully mix the above materials to obtain a polyvinyl alcohol composition, and vacuum-dry;

[0036] The polyvinyl alcohol composition is melt-extruded, the extrusion temperature is 210°C, cooled, and pelletized to obtain starch-modified polyvinyl alcohol granules;

[0037] The above-mentioned starch-modified polyvinyl alcohol granules were added to a film blowing unit for blow molding, and the film blowing temperature was 175° C. to obtain a starch...

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Abstract

The invention discloses a starch-modified polyvinylalcohol high-resistance degradable thin film and a preparing method. The starch-modified polyvinylalcohol high-resistance degradable thin film is prepared by smelting a polyvinylalcohol composition. The polyvinylalcohol composition is prepared from, by mass, 60-75 wt% of polyvinylalcohol, 10-20 wt% of starch modified with an oxidizing agent, 5-15 wt% of plant fibers, 1-5 wt% of natural polyphenol and 0-1 wt% of calcium oxide, wherein the mass sum of the components is 100%. By adding the starch modified with the oxidizing agent into the polyvinylalcohol base, the water resistance of the polyvinylalcohol thin film is improved while the mechanical performance of the polyvinylalcohol thin film is improved. By adding the plant fibers, the mechanical performance of the polyvinylalcohol thin film is further improved. By adding the natural polyphenol/calcium oxide composite modifying agent and the starch, the melting point of the polyvinylalcohol thin film is lowered, the melting processing window of polyvinylalcohol is enlarged, a plasticizer does not need to be added, and the reduction, caused by the plasticizer, of the mechanical performance and barrier performance of the polyvinylalcohol thin film is relieved. The prepared starch-modified polyvinylalcohol high-resistance degradable thin film is excellent in comprehensive performance, and the application range is widened.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a starch-modified polyvinyl alcohol high-barrier degradable film, and also to a preparation method of the starch-modified polyvinyl alcohol high-barrier degradable film. Background technique [0002] Polyvinyl alcohol (PVA) is one of the few polyols with excellent properties that can be produced on a large scale by non-petroleum routes. PVA's multi-hydroxyl strong hydrogen bond structure endows it with excellent comprehensive properties, such as excellent water solubility, mechanical properties and thermal properties superior to polyolefins, comparable to engineering plastics, excellent acid and alkali corrosion resistance, organic solvent resistance and barrier properties, with Biodegradable, etc., widely used in coatings, adhesives, paper sizing agents, textile sizing agents, emulsifiers, dispersants, oilfield chemicals, cosmetics, fibers, films, etc., are key materials require...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L3/10C08L1/02C08K5/13C08K3/22C08B31/18
Inventor 齐海港
Owner 西安艾菲尔德复合材料科技有限公司
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