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A kind of thermoplastic starch plastic with high hydrophobicity and preparation method thereof

A thermoplastic starch and plastic technology, applied in the field of biodegradable plastics, can solve the problems of reducing the use of starch plastics, high cost of esterification reactants, poor fluidity, etc., to achieve full utilization of renewable resources, reduce pollution and dependence on petroleum products , the effect of good hydrophobic performance

Active Publication Date: 2015-09-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the invention patent application with the application number 200810017406.5 discloses a method for preparing hydrophobized thermoplastic starch, and the invention patent with the application number 200810017407.X discloses a method for hydrophobicizing polyamide polyamine / starch blends. The invention patent application No. 200810017408.4 discloses a method for preparing hydrophobized thermoplastic starch with alkenyl succinic anhydride. Strong hydrogen bond force, and the molecular structure presents polar properties, so it shows strong water absorption performance. Starch modified by esterification is difficult to plasticize and has poor fluidity. Therefore, it is difficult to implement screw extrusion in the actual process.
In addition, the cost of esterification reactants added by these methods is relatively high, and new chemical residues are introduced, reducing the use of starch plastics

Method used

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  • A kind of thermoplastic starch plastic with high hydrophobicity and preparation method thereof
  • A kind of thermoplastic starch plastic with high hydrophobicity and preparation method thereof
  • A kind of thermoplastic starch plastic with high hydrophobicity and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] The oxidized starch was prepared according to the method disclosed in the invention patent application with application number 200710050652.6, and its carbonyl content was 35%. Get 100 parts of oxidized starches with a carbonyl content of 35%, disperse them in 233 parts of water, and after high-speed stirring forms an emulsion with a concentration of 30%, add 15 parts of nitrile rubber emulsions, after high-speed stirring for 1 hour, adopt high-speed centrifugation, and use water ( It can be washed with industrial water) for 3 times, and dried in a vacuum oven for 24 hours to obtain the oxidized starch / elastic particle composite material sample; after high-speed crushing, the oxidized starch / elastic particle composite material with a mesh number of not less than 50 mesh can be obtained. Get 75 parts of oxidized starch / elastic particle composite material after pulverizing, after mixing evenly with 20 parts of glycerin, 2 parts of zinc stearate, 3 parts of liquid paraffin,...

Embodiment 2

[0074] According to the method disclosed in the invention patent application with application number 200710050652.6, the oxidized starch is prepared, and its carbonyl content is 35%. Take 100 parts of oxidized starch with a carbonyl content of 35%, disperse it in 233 parts of water, and stir it at a high speed to form a concentration of 30%. After the emulsion, add 20 parts of PU emulsion, stir at high speed for 1 hour, use high-speed centrifugation, wash with water (industrial water can be used) for 3 times, and dry in a vacuum oven for 24 hours to obtain the oxidized starch / elastic particle composite material sample . After high-speed crushing, the oxidized starch / elastic particle composite material with a mesh number not less than 50 mesh is obtained. Get 80 parts of oxidized starch / elastic particle composite material after pulverizing, mix with 15 parts of glycerol, 1 part of zinc stearate, 4 parts of liquid paraffin after mixing evenly, adopt twin-screw extruding, the asp...

Embodiment 3

[0076] According to the method disclosed in the invention patent application with the application number 200710050652.6, the oxidized starch is prepared, and its carbonyl content is 35%. Take 100 parts of oxidized starch with a carbonyl content of 35%, disperse it in 233 parts of water, and stir it at a high speed to form a 30% concentration. After the emulsion, add 5 parts of nitrile rubber emulsion, stir at high speed for 1 hour, use high-speed centrifugation, wash with water (industrial water can be used) for 3 times, and dry in a vacuum oven for 24 hours to obtain the composite of oxidized starch / elastic particle Material samples. After high-speed crushing, the oxidized starch / elastic particle composite material with a mesh number not less than 50 mesh is obtained. Get 80 parts of oxidized starch / elastic particle composite material after pulverizing, after mixing with 15 parts of formamide, 0.5 part of zinc stearate, 2 parts of liquid paraffin, and 2.5 parts of castor oil,...

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Abstract

The invention discloses a thermoplastic starch plastic with high hydrophobic property and a preparation method thereof. The thermoplastic starch plastic has the following components by weight percent: 65 to 80 percent of oxidized starch, 2.5 to 25 percent of elastic particles, 0.1 to 1.5 percent of plasticizer and 0.1 to 5 percent of lubricant. The preparation method of the thermoplastic starch plastic comprises the following steps: mixing the oxidized starch together with the elastic particles at first, then washing and drying after centrifugal separation; obtaining elastic particles with more than 50 meshes, which are called oxidized starch coating material, and mixing the oxidized starch coating material with the plasticizer and the lubricant mechanically; and finally, carrying out extruding pelletizing with an extruder. According to the invention, the thermoplastic starch plastic has excellent hydrophobic property, and the surface contact angle is increased from 37.5 degrees of pure starch to 108 degrees, which is improved by 3 times, so that the surface contact angle is greater than 90 degrees, and the purpose that the thermoplastic starch plastic has hydrophobic property is realized.

Description

technical field [0001] The invention relates to the field of biodegradable plastics, in particular to a thermoplastic starch plastic with high hydrophobicity and a preparation method thereof. Background technique [0002] Thermoplastic starch plastics can be completely biodegradable, and have attracted much attention because of their advantages such as low price, abundant sources, and easy modification. Since the 1980s, with the vigorous development of starch-degradable plastics research and development, people have made great breakthroughs in the research on the physical and chemical modification, thermoplastic behavior and mechanical properties of starch. Many types of starch biodegradable plastics have been developed at home and abroad, but their mechanical properties are brittle and greatly affected by environmental humidity, which severely limits the application of thermoplastic starch plastics. Chemical modification includes esterification, etherification, and oxidati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L3/10C08L9/02C08L75/04C08L33/00C08K5/00C08K5/053C08K5/098C08K5/20
Inventor 张水洞殷悦
Owner SOUTH CHINA UNIV OF TECH
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