Method for preparing modified soybean protein biological degradation plastic

A technology for biodegradable plastics and soybean protein is applied in the field of preparation of modified soybean protein biodegradable plastics, which can solve the problems of poor water resistance and poor processing performance, and achieve wide application fields, good biodegradability and good water resistance. Effect

Inactive Publication Date: 2008-06-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of preparation method of modified soybean protein biodegradable plastics for the shortcomings of soybean protein plastics brittleness, poor water resistance and poor processability, by selecting suitable corn gluten powder or gluten powder blend to Soybean protein plastics are blended and modified to improve the mechanical properties and water resistance of plastics, and obtain plastics with better tensile strength, elongation at break, water resistance and processing properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Soybean protein isolate was mixed in a high-speed mixer for 20 minutes, then ground and mixed with glycerin for 30 minutes, put into a polyethylene bag, placed in a refrigerator at 2-6°C, and left to stand for 24 hours; the obtained material was put into a self-made mold, Then at 160° C., 20 MPa, hot pressing for 10 minutes to make a plastic sheet, cooling and demoulding; the weight parts of the above raw materials are as follows: soybean protein isolate 70, glycerin 30;

[0023] Repeat the above steps by using soy protein concentrate and defatted protein powder instead of soy protein isolate. Table 1 shows the mechanical properties and water absorption properties of different soybean protein biodegradable plastics.

[0024] Table 1

[0025] sample name

[0026] The results in Table 1 show that the mechanical properties and water absorption properties of the biodegradable plastic prepared by using soybean protein isolate raw material in the present invention...

Embodiment 2

[0028] Put soybean protein isolate and glycerin into a high-speed mixer and mix for 50 minutes, put it into a polyethylene bag, put it in a refrigerator at 2-6°C, and let it stand for 48 hours; put the obtained material into a self-made mold, and then heat it at 110°C , 10MPa, hot pressing for 2min, made into a plastic sheet, cooled and stripped; the weight parts of the above raw materials are as follows: soybean protein isolate 60, glycerin 40.

[0029] Use a kneader, mortar or pulverizer to mix and repeat the above steps.

[0030] Table 2 shows the mechanical properties of soybean protein plastics under different mixing methods.

[0031] Table 2

[0032] Hybrid

[0033] The results in Table 2 show that the biodegradable plastic prepared by high-speed mixing, kneading, grinding or pulverizing in the present invention has excellent mechanical properties.

Embodiment 3

[0035] Grind soybean protein isolate and glycerin for 15, 20, and 30 minutes, put them in a polyethylene bag, put them in a refrigerator at 2-6°C, and let them stand for 42 hours; 40MPa, hot pressing for 6min, made into a plastic sheet, cooled and stripped; the weight parts of the above raw materials are as follows: soybean protein isolate 80, glycerin 20;

[0036] Table 3 shows the mechanical properties of the plastics obtained by grinding for different times.

[0037] table 3

[0038] Mixing time / min

[0039] The results in Table 3 show that the mechanical properties of the biodegradable plastics prepared under the mixing time conditions selected by the present invention are excellent.

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PUM

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Abstract

The invention relates to a preparation method for modified soybean protein biodegradation plastic which comprises steps that: (1) soy protein isolate are mixed with corn protein powder or wheat gluten and glycerol or compound plasticizer for 10-50 min and then placed in a refrigerator with temperature of 2-6 DEG C for standing of 24-48 h; (2) the material obtained from step (1) is put into a self-made mould, and then hot pressed for 2-10 min under the circumstance of 110-160 DEG C and 5-40MPa so as to form plastic sheets, and then cooled and demolded. The invention has the advantages of simple production technique, no pollution, good waterproof property, good tensile strength and high elongation at break, and can be used for disposable tableware, agricultural and gardening tools, toy and outdoor sports equipment and so on.

Description

(1) Technical field [0001] The invention relates to a preparation method of modified soybean protein biodegradable plastics. (2) Background technology [0002] Due to the depletion of petroleum resources and the harm to the ecological environment caused by synthetic plastic waste, the research and development of biodegradable materials has attracted increasing attention. In addition, there are problems in the existing main methods for dealing with non-degradable plastic waste, such as landfilling wastes a lot of land, incineration will emit carbon dioxide and dioxin and other harmful substances, and the cost of recycling and reprocessing is high, and the plastic products after processing Therefore, replacing non-degradable plastics with biodegradable plastics is an effective way to reduce environmental pollution, and it is also an inevitable trend in the development of the plastics field. [0003] Soybean protein has a wide range of sources, high yield, renewable and biodeg...

Claims

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Application Information

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IPC IPC(8): C08L89/00C08K5/20C08K5/053
Inventor 温其标杨晓泉邹文中黄国平
Owner SOUTH CHINA UNIV OF TECH
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