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Surface cross-linking treatment method for thermoplastic starch products

A thermoplastic starch and cross-linking treatment technology, which is applied in the field of surface modification of solid materials, can solve problems such as the need for ultraviolet light sources and the limitation of the thickness of the surface cross-linked layer, and achieve the effects of simple process, reduced sensitivity, and low cost

Inactive Publication Date: 2010-12-29
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only requires an ultraviolet light source, but also the thickness of the surface crosslinked layer is limited by the penetration depth of ultraviolet light

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Make a mixture of water and starch with a mass ratio of 95 / 5 into a slurry, stir continuously at 90°C to completely gelatinize the starch milk, keep it warm for 30 minutes, and make the bubbles in the paste liquid under the condition of a pressure of about 0.09MPa come out. The obtained paste liquid is cast on a polypropylene plate to form a thermoplastic starch film, and the thickness range can be adjusted between 0.1-0.3 mm.

[0042] Put a thermoplastic starch film with a water content of about 12% into a borax aqueous solution with a concentration of 4.0% and soak for 60 seconds, take it out, drain the surface water, and then place it in an environment of 50°C for 8 hours to obtain a surface-crosslinked starch film. Thermoplastic starch film.

Embodiment 2

[0044] With example 1, difference is that the composition of starch milk is the mixture of the water of mass ratio 95 / 4 / 1, starch and glycerol. The thermoplastic starch film is soaked in 10% borax aqueous solution for 10 seconds, and then placed in an environment of 50° C. for 1 hour to obtain a surface-crosslinked thermoplastic starch film.

Embodiment 3

[0046] Same as Example 2, the difference is that the thermoplastic starch film is immersed in a 0.5% boric acid aqueous solution for 60 seconds, and then placed in an environment of 80° C. for 5 hours to obtain a surface-crosslinked thermoplastic starch film.

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Abstract

The invention relates to a surface cross-linking treatment method for thermoplastic starch products and belongs to the technical field of a solid material surface modifying method. The method comprises the steps of: leading the cross-linking agent into the surface layer of the thermoplastic starch products, performing the cross-linking reaction between the cross-linking agent with the hydroxyl on starch molecule under a condition of heating and forming a cross-linking network between the starch molecule chains on the surface layer of the products. According to the method, the solid cross-linking reaction is utilized to only perform proper cross-linking treatment on hydrophilic hydroxyl on the surface layer of the thermoplastic starch products. Without changing the condition of the main component of the thermoplastic starch products and the treatment property, the sensibility of the products to the environmental humidity is decreased and the water-tolerant property is promoted. After the surface is cross-linked, the sensibility of the products to the environmental humidity is obviously decreased. Under an environment with humidity of 95%, the balanced water content is at least 64.2% of the water content before being modified, namely decreased by 35.8% at most. The anti-solvent dissolubility is also obviously promoted. The solvent which is soluble in dimethyl sulfoxide becomes insoluble.

Description

technical field [0001] The invention relates to a surface crosslinking treatment method for thermoplastic starch products, relates to a method for forming a crosslinked layer on the surface of thermoplastic starch products, and belongs to the technical field of solid material surface modification methods. Background technique [0002] Thermoplastic starch generally means that in the presence of water or other plasticizers, the hydrogen bonds between starch molecules are destroyed by applying heat and mechanical energy to the original starch, so that the crystalline structure in the original starch granules is melted and sheared. Disintegration, the final formation of disordered continuous phase of starch molecular chains. At this point, the resulting starch material has thermoplastic behavior and can be further processed into various products using conventional plastic processing equipment. [0003] Although thermoplastic starch has the advantages of biodegradability and re...

Claims

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Application Information

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IPC IPC(8): C08J7/12C08J3/24C08J5/18C08L3/02C08L29/04C08K5/053C08K5/07C08K5/092C08K3/38C08K3/32
Inventor 周江刘子芹蒋蔓佟金马云海
Owner JILIN UNIV
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