Starch based nanometer photocatalytic composite degrading modifying agent and preparation method thereof

A modifier and nano-light technology, which is applied in the field of environment-friendly and fully degradable starch-based nano-photocatalytic composite degradation modifier and its preparation, can solve the problems of physical and mechanical performance decline, difficult processing, slow degradation speed, etc., and achieve Improve the compatibility and binding force, increase the degradation rate, improve the effect of dispersion

Inactive Publication Date: 2012-06-20
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the relative cost of the polylactic acid used is relatively high, and it is not suitable for large-scale application in the field of disposable plastic products.
[0007] Other studies have shown (Wang Yunfang et al., Progress in Research on Starch-Based Environmentally Degradable Polymer Materials [J], Materials Herald, 2005, 4:12-15), while starch can improve the degradability of plastics, on the one hand it will cause its physical degradation. The decline in mechanical properties makes it difficult to process. On the other hand, it is too hydrophilic and has poor compatibility with most general-purpose resins, resulting in a significant decline in the mechanical properties of the material, thus hindering the industrialization of starch plastics. Wide application in the promotion process
Therefore, in order to ensure the end-use performance of starch-based plastic products, the general solution is to reduce the amount of starch added, but this will bring about higher product costs and slower degradation.

Method used

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  • Starch based nanometer photocatalytic composite degrading modifying agent and preparation method thereof
  • Starch based nanometer photocatalytic composite degrading modifying agent and preparation method thereof
  • Starch based nanometer photocatalytic composite degrading modifying agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] First put 25 parts each of anatase nano-titanium dioxide with a particle size of 30-50nm and nano-cerium oxide with a particle size of 30-50nm into an ultra-high-speed mixer, and stir for 30 minutes at 3000 rpm, during which 1.5 parts of γ- Add the mixture of aminopropylmethyldiethoxysilane and 100 parts of absolute ethanol in 3 times. After the addition, continue to stir and mix at a high speed for 2 hours, then filter with suction, dry the powder at 100°C, and put Put into a ball mill and pulverize for at least 1 hour.

[0045] 2 parts of the nano-auxiliary after the surface modification obtained and 20 parts of triethyl citrate were dispersed by colloid mill for 2 hours, then mixed with 80 parts of rice starch, 15 parts of polyvinyl alcohol of 1799 and tetrakis (β-(3, Put 1 part of 5-di-tert-butyl-4-hydroxyphenyl) propionate) pentaerythritol ester antioxidant into a high-speed mixer, stir for 20 minutes at a temperature of 80 ° C and a speed of 100 rpm, discharge, an...

Embodiment 2

[0047] First put 30 parts of nano-cerium oxide with a particle size of 30-50nm into an ultra-high-speed mixer, and stir for 20 minutes at 4000 rpm, during which 0.5 parts of γ-aminopropylmethyldiethoxysilane and no The mixed solution of 50 parts of water and ethanol was added in 2 times. After the addition, continue to stir and mix at ultra-high speed for 2 hours, then filter with suction, dry the powder at 110°C, and put it into a ball mill for grinding for at least 1 hour.

[0048] 1 part of the obtained surface-modified nano-auxiliary, 3 parts of polyoxyethylene polyoxypropylene ether block copolymer with a relative molecular weight of 1000 g / mol and 7 parts of acetyl tri-n-butyl citrate were dispersed through a colloid mill for 1.5 Hours, then with 50 parts of cornstarch, 30 parts of mung bean starch, 17 parts of polyvinyl alcohol of 1799 and 0.5 part of 2,2'-methylene bis(4-methyl-6-tert-butylphenol) antioxidant, drop into high speed In the mixer, stir for 20 minutes at a...

Embodiment 3

[0049] Embodiment 3 (the embodiment 3 of corresponding packing bag)

[0050] First put 40 parts of anatase-type nano-titanium dioxide with a particle size of 30-50nm and 10 parts of nano-cerium oxide with a particle size of 30-50nm into an ultra-high-speed mixer, and stir at 5000 rpm for 10 minutes, during which 1.5 parts of γ - The mixture of aminopropylmethyldiethoxysilane and 100 parts of absolute ethanol was added in 3 times. After the addition, continue to stir and mix at a high speed for 1.5 hours, then filter with suction, dry the powder at 110°C, and then Put into a ball mill and grind for at least 1 hour.

[0051] 1.5 parts of nano additives after the surface modification obtained and 5 parts of polyoxyethylene polyoxypropylene ether block copolymers and 10 parts of acetyl tri-n-butyl citrate with a relative molecular weight of 2000 g / mol were dispersed by a colloid mill for 2 hour, then with 30 parts of lotus root starch, 42 parts of potato starch, 20 parts of polyv...

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Abstract

The invention discloses a starch based nanometer photocatalytic composite degrading modifying agent. The modifying agent is prepared by carrying out melt blending on the following raw materials, wherein the raw materials comprise, by weight, 72-87 parts of starch, 10-25 parts of polyvinyl alcohol, 10-20 parts of a small molecular plasticizer, 0.2-2 parts of a modified inorganic nanometer additive, and 0.5-1.5 parts of an antioxidant, wherein the modified inorganic nanometer additive is prepared by carrying out a surface lipophilic modification treatment on at least a material selected from anatase type nano-titanium dioxide, mixed crystal type nano-titanium dioxide and nano-cerium oxide through a silane coupling agent. The present invention further discloses a preparation method for the starch based nanometer photocatalytic composite degrading modifying agent. According to the present invention, the starch based nanometer photocatalytic composite degrading modifying agent of the present invention is adopted to modify the polymer material, such that the complete biodegradability can be achieved; the high content starch is added to the system, such that the cost of the final productcan be substantially reduced; with the added nanometer additive, it is ensured that the product has good physical and mechanical properties; the agent and the method of the present invention can be used for modifying preparations of various disposable plastic products, mulch films, supermarket plastic packaging bags, and the like.

Description

technical field [0001] The invention belongs to the technical field of modifiers for plastic products and their preparation, and in particular relates to an environment-friendly and completely degradable starch-based nano-photocatalytic composite degradation modifier that can be used to improve the degradation performance of plastic products and a preparation method thereof. Background technique [0002] With the improvement of people's living standards and the acceleration of the pace of life, the amount of disposable plastic products is increasing day by day, and the use of a large number of plastic products, while bringing convenience to people, is difficult to decompose in the natural environment. Serious "white pollution" has been brought about. my country has banned the production, sale, and use of plastic shopping bags with a thickness of less than 0.025 mm (referred to as ultra-thin plastic shopping bags) since June 1, 2008; Using the system, plastic shopping bags sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08L29/04C08K13/06C08K9/06C08K3/22C08K5/11B29B9/06B29C47/92B29C48/92
CPCB29C48/04B29C48/40B29C48/92B29C2948/92704B29C2948/92895
Inventor 郭刚侯世荣
Owner SICHUAN UNIV
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