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Degradable plastic with cross-linked N-acylated grain protein and its prepn process

A degradable plastic and cross-linking technology, which is applied in the field of cross-linked N-acylated cereal protein degradable plastics and its preparation, can solve the problems of increased brittleness of protein plastics, huge impact on the performance of protein plastics by the environment, loss of use functions, etc. problem, to achieve the effect of a wide range of sources

Inactive Publication Date: 2006-03-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the performance of protein plastics is greatly affected by the environment
Second, although the use of water-soluble polyols as plasticizers improves the processing performance of proteins and improves the toughness of materials, when protein plastics come into contact with water or food containing water, the polyol plasticizers gradually dissolve and the brittleness of protein plastics increases. , or even lose the function

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] The preparation of N-acylated cereal protein is one of the keys of the present invention. Put the cereal protein powder in the aprotic medium N,N-dimethylformamide, make a 5-15% suspension, add N-acylating agent equivalent to 10-20% of the cereal protein in batches, Under the condition of stirring, react at 30-90° C. for 2-8 hours, filter with suction, and naturally dry the solid product at room temperature to obtain N-acylated cereal protein. The N-acylating agent used in the present invention is an acid chloride or acid anhydride with double bonds. Cross-linkable properties. In addition, acid chlorides or acid anhydrides as N-acylating agents can also react with sulfhydryl or hydroxyl groups on protein molecules.

[0029] The N-acylation modification of cereal protein is usually carried out in aqueous medium, using an acid anhydride such as acetic anhydride or succinic anhydride as the N-acylating agent, and a concentrated alkali solution needs to be added during th...

Embodiment 1

[0034] Using gluten as raw material to prepare cross-linked N-acylated cereal protein degradable plastics, comprising the following steps:

[0035] 1) Weigh 100g of gluten powder, grind it into powder, pass through a 100-mesh stopper, put it in N,N-dimethylformamide, stir it mechanically to form a 5% suspension, add 10g of acryloyl chloride in batches, and Under stirring conditions, react at 30°C for 8 hours, filter with suction, and dry the solid product naturally at room temperature to obtain N-acylated gluten protein;

[0036] 2) Take by weighing 100g N-acylated gluten protein, 20g triethyl citrate, 0.5g stearic acid, 0.5g2,6-di-tert-butyl-4-methylphenol and 0.1g ethyl sorbate, Put it in a high-speed mixer, mix it at room temperature for 2 minutes at a speed of 3000r / min, put the mixed material on an open mill, and mix it at 10°C for 15 minutes, and add 1g of dicumyl peroxide during the mixing process to obtain N -Acylated gluten protein composition, placed in GB / T1040-92 ...

Embodiment 2

[0038] Using rice protein powder as a raw material to prepare cross-linked N-acylated cereal protein degradable plastics, comprising the following steps:

[0039]1) Weigh 100g of rice protein powder, grind it into powder, pass through a 100-mesh stopper, place it in N,N-dimethylformamide, stir it mechanically to form a 15% suspension, and add 20g of methacryloyl chloride in batches , reacted at 90°C for 2 hours under stirring conditions, filtered with suction, and dried the solid product naturally at room temperature to obtain N-acylated rice protein;

[0040] 2) Weigh 100g N-acylated rice protein, 100g tri-n-butyl citrate, 1.5g hydroxystearic acid, 1.5g 2,6-di-tert-butyl-4-hydroxymethylphenol and 1g p-hydroxyl sorbate Butyl benzoate, placed in a high-speed mixer, mixed at room temperature for 10 minutes at a speed of 1000r / min, placed the mixture on an open mixer, and mixed for 5 minutes at 40°C, and added 7g of tert-butyl cumene during the mixing process base peroxide to ob...

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PUM

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Abstract

The degradable cross-linked N-acylated grain protein plastic includes N-acylated grain protein 100 weight portions, plasticizer 20-100 weight portions, lubricant 0.5-1.5 weight portions, antioxidant 0.5-1.5 weight portions, preservative 0.1-1 weight portions and cross-linking agent 1-7 weight portions. The preparation process includes N-acylating modification of grain protein with acyl chloride or acid anhydride with double bond to introduce side chain with double bond to grain protein molecule; matching N-acylated grain protein with non-toxic plasticizer, lubricant, antioxidant, preservative and cross-linking agent; thermoplastic processing and high temperature molding to obtain the degradable cross-linked N-acylated grain protein plastic with excellent waterproof and antiageing performance.

Description

technical field [0001] The invention relates to a cross-linked N-acylated cereal protein degradable plastic and a preparation method thereof. Background technique [0002] At present, the world's total plastic output exceeds 170 million tons, which has penetrated into various fields of the national economy and people's lives. However, plastic raw materials are increasingly constrained by the shortage of petroleum, and the environmental pollution caused by the waste of a large number of plastic products is becoming increasingly serious. According to statistics, waste plastics account for 7-8% of the total waste in developed countries. The development of degradable plastics can reduce white pollution and have prominent economic and social benefits. The production of degradable plastics from natural polymers such as starch, cellulose, chitin, protein and other natural polymers of agricultural products has become one of the hot spots of international research and development. ...

Claims

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Application Information

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IPC IPC(8): C08L89/00C08K5/14C08J3/24
Inventor 宋义虎郑强孙少敏张其斌
Owner ZHEJIANG UNIV
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