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Thermoplastic starch elastomer and preparation method thereof

A thermoplastic starch and elastomer technology, applied in the field of starch deep processing, can solve the problems of narrow processing temperature window and poor thermoplastic starch strength, and achieve the effects of wide processing temperature window, increased molecular weight and high strength

Active Publication Date: 2015-06-03
东莞市汇泽实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the disadvantages of poor strength and narrow processing temperature window of existing thermoplastic starch, the invention provides a thermoplastic starch elastomer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Konjac starch of 75 parts by weight is formulated into starch milk with a concentration of 20%, and the starch milk is sent into a high-pressure homogenizer, and the high-pressure homogenizer uses a reciprocating pump to make the starch emulsion quickly pass through the slender homogeneous valve channel , the shearing effect and the high-speed impact effect generated by the impact ring impact disintegrate the starch branch chain structure, and the starch chain breaks transform into a straight chain structure, reducing the molecular weight of the starch, and the molecular weight distribution is 3×10 4 ~5×10 4 g·mol -1 within a narrow constant range;

[0037] 2) Put 10 parts by weight of wheat gluten, 3 parts by weight of hydroxyl-terminated polybutadiene, 0.5 parts by weight of toluene diisocyanate and the low molecular weight amylose obtained in step 1) into a vacuum kneader for kneading, the temperature Raise to 100°C, under the condition of 35rpm low-speed stirring...

Embodiment 2

[0043] 1) The sago starch of 75 parts by weight is formulated into starch milk with a concentration of 20%, and the starch milk is sent into a high-pressure homogenizer, which uses a reciprocating pump to make the starch emulsion quickly in the long and thin homogeneous valve channel. Through the shearing effect generated and the high-speed impact effect generated by the impact of the impact ring, the starch branched chain structure is disintegrated, and the starch chain breaks and transforms into a straight chain structure, which reduces the molecular weight of the starch. The molecular weight distribution is 3×10 4 ~5×10 4 g·mol -1 within a narrow constant range;

[0044] 2) Put 8 parts by weight of wheat gluten, 5 parts by weight of hydroxyl-terminated polybutadiene, 0.5 parts by weight of diphenylmethane diisocyanate and the low molecular weight amylose obtained in step 1) into a vacuum kneader for Kneading, the temperature rises to 80°C, under the condition of 35rpm low...

Embodiment 3

[0050] 1) Prepare 80 parts by weight of pea starch into starch milk with a concentration of 25%, and send the starch milk into a high-pressure homogenizer. The high-pressure homogenizer uses a reciprocating pump to quickly pass the starch emulsion through the long and thin homogeneous valve channel. , the shearing effect and the high-speed impact effect generated by the impact ring impact disintegrate the starch branch chain structure, and the starch chain breaks transform into a straight chain structure, reducing the molecular weight of the starch, and the molecular weight distribution is 3×10 4 ~5×10 4 g·mol -1 within a narrow constant range;

[0051] 2) Add 5-10 parts by weight of gluten, 3-5 parts by weight of hydroxyl-terminated polybutadiene, 1 part by weight of toluene diisocyanate and the low molecular weight amylose obtained in step 1) into a vacuum kneader Carry out kneading, the temperature rises to 100°C, under the condition of 30-35rpm low-speed stirring, the sp...

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Abstract

The invention provides a thermoplastic starch elastomer. An elastic polymer of a starch-polybutadiene-vital gluten interpenetrating polymer network is formed by hydroxyl-terminated polybutadiene and low-molecular-weight straight-chain starch and vital gluten chain expansion, and the polymer is a high-strength thermoplastic starch elastomer with large intensity and excellent heat-resistance performance. The invention further provides a preparation method of the thermoplastic starch elastomer. The branched structure of starch milk is disassembled through a high-pressure homogenizer, a starch chain is fractured and converted into a straight chain structure, the molecular weight of starch is reduced and distributed in a narrow constant range, then chain expansion is performed on starch milk together with hydroxyl-terminated polybutadiene and vital gluten, so that the polymerization is increased, the molecular weight is improved, not only can the intensity be high, but also the processing temperature window is broadened. The preparation method is simplified in production technology, the production environment is clean, the performances of products are improved, and the preparation method is suitable for large-scale production and application.

Description

technical field [0001] The invention relates to the field of starch deep processing, in particular to a high-strength thermoplastic starch elastomer and a preparation method thereof. Thermoplastic starch elastomers can be used in biodegradable plastics, elastomers, hot melt adhesives and other products. Background technique [0002] Starch (Starch) is a natural polymer material with a wide range of sources, low price, and short regeneration cycle. Its molecular chain contains a large number of hydroxyl groups. These groups form a crystalline state and Aggregate structure with coexistence of amorphous form. Due to the hydrogen bond interaction generated by a large number of hydroxyl groups on the surface of starch granules, it has a strong intramolecular synergy and is not easy to plasticize. In addition, the melting point of native starch is higher than the thermal decomposition temperature, resulting in its poor thermal processability. Therefore, starch cannot be subjec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/12C08L89/00C08L9/00C08K3/36
CPCC08K3/36C08L3/12C08L9/00C08L89/00
Inventor 陈庆曾军堂
Owner 东莞市汇泽实业有限公司
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