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A kind of preparation method of modified soybean protein plastic

A technology for soybean protein and soybean protein isolate, which is applied in the field of preparation of modified soybean protein plastics, can solve the problems of brittleness, poor water resistance and poor processing performance of soybean protein plastics, and achieves good water resistance, improved elongation at break, The effect of good biodegradability

Active Publication Date: 2016-07-06
邹文中
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation method of modified soybean protein plastics, aiming at the shortcomings of soybean protein plastics being brittle, poor water resistance and poor processing performance, by selecting suitable gluten powder, high amylose starch, and chitosan to blend Soybean protein plastics are blended and modified to improve the mechanical properties and water resistance of the plastics, and obtain plastics with good tensile strength, elongation at break, water resistance and processing properties

Method used

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  • A kind of preparation method of modified soybean protein plastic

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Effect test

Embodiment 1

[0027] Raw material ratio (parts by weight): soybean protein isolate 50; high amylose starch 1; modified chitosan 3; composite plasticizer 25;

[0028] The composite plasticizer is formed by blending glycerin and formamide, the ratio of the three is 2:8 to 8:2, and the blending time is 10 to 30 minutes;

[0029] Described modified chitosan is O-carboxymethyl chitosan, and the preparation method of O-carboxymethyl chitosan is to join 5g chitosan in 50ml42%NaOH, under greenhouse, add 1 while stirring After reacting ~6g of chloroacetic acid for 24~36 hours, adjust to neutrality with 1:1 HCL, precipitate with absolute ethanol, and soak and wash several times. Finally, dry it in vacuum at 60°C to obtain O-carboxymethyl chitosan;

[0030] Pretreatment: Soybean protein isolate, high amylose starch and modified chitosan are all sieved, the particle size is 100-300 mesh, and the moisture content of raw materials is lower than 6% after drying. The drying process is vacuum drying or ov...

Embodiment 2

[0036] Raw material ratio (parts by weight): soybean protein isolate 65; high amylose starch 4; modified chitosan 7; composite plasticizer 30;

[0037] The composite plasticizer is formed by blending glycerin and formamide, the ratio of the three is 2:8 to 8:2, and the blending time is 10 to 30 minutes;

[0038] Described modified chitosan is O-carboxymethyl chitosan, and the preparation method of O-carboxymethyl chitosan is to join 5g chitosan in 50ml42%NaOH, under greenhouse, add 1 while stirring After reacting ~6g of chloroacetic acid for 24~36 hours, adjust to neutrality with 1:1 HCL, precipitate with absolute ethanol, and soak and wash several times. Finally, dry it in vacuum at 60°C to obtain O-carboxymethyl chitosan;

[0039] Pretreatment: Soybean protein isolate, high amylose starch and modified chitosan are all sieved, the particle size is 100-300 mesh, and the moisture content of raw materials is lower than 6% after drying. The drying process is vacuum drying or ov...

Embodiment 3

[0045] Raw material ratio (parts by weight): soybean protein isolate 65; high amylose starch 3; modified chitosan 5; composite plasticizer 30;

[0046] The composite plasticizer is formed by blending glycerin and formamide, the ratio of the three is 2:8 to 8:2, and the blending time is 10 to 30 minutes;

[0047] Described modified chitosan is N, O-carboxymethyl chitosan, and the preparation method of N, O-carboxymethyl chitosan is that 10g chitosan is added in 1000mL42%NaOH solution, transfers after fully swelling Add 100mL of isopropanol to a three-necked flask, let it sit for 30 minutes, then add 2-8g of chloroacetic acid, raise the temperature to 60°C and react for 3-6 hours, after cooling, adjust the pH of the solution to neutral with glacial acetic acid, and precipitate with absolute ethanol , washed repeatedly with 95% ethanol and absolute ethanol, and dried the synthesized product at 60°C to obtain N, O-carboxymethyl chitosan;

[0048] Pretreatment: Soybean protein iso...

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Abstract

The invention provides a preparation method of modified soybean protein plastic. The method comprises the following steps: (1) weighing soybean protein isolate, high amylose starch, modified chitosan and a compound plasticizer; (2) grinding various raw materials for 10-20 minutes, mixing for 20-35 minutes by virtue of a kneading machine, so as to obtain a mixture, bagging and standing at a room temperature for 12-24 hours; and (3) putting the mixture into a mold, firstly, preheating at 60-80 DEG C for 0.5-2 minutes by virtue of a compression molding machine, and then carrying out hot pressing at 130-150 DEG C and 5-15MPa for 4-8 minutes, so as to prepare a plastic sheet. The modified soybean protein plastic prepared by the method disclosed by the invention is simple in preparation process, wide in raw material source, and biodegradable, has the advantages of good mechanical property and water resistance, and can be applied to packing materials, agricultural sustained release systems, sporting goods, outdoor appliances and the like.

Description

technical field [0001] The invention relates to a preparation method of modified soybean protein plastic. Background technique [0002] In recent years, due to the depletion of petroleum resources and the aggravation of environmental pollution, soybean protein, as a renewable and biodegradable material, has been applied to the field of non-food industry. Among them, the research and development of soybean protein plastics began in the 1940s. Although the material has good biodegradability and high strength, it has the disadvantages of high brittleness and poor water resistance. The toughness and water resistance of soybean protein plastics are improved by plasticizing modification, but the tensile strength is decreased. Using polylactic acid and polycaprolactone to blend and modify soybean protein plastics, its strength, toughness and water resistance are all improved, but the above modification requires the addition of appropriate compatibilizers, and the price of biodegra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L89/00C08L3/12C08L5/08C08K5/053C08K5/20C08B37/08
Inventor 邹文中张小芳
Owner 邹文中
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