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Method for preparing degradable starch-base plastics

A technology for degrading starch and plastics, which is applied in the field of preparation of degradable starch-based plastics. It can solve the problems of lack of vitality, incomplete degradation, and plastic competition, and achieve the effects of reducing product costs, improving application performance, and enhancing mechanical strength.

Inactive Publication Date: 2012-08-01
NINGBO DELVERPHARM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, considering the overall performance and cost, all degradable materials cannot replace the current plastics, and some varieties such as filled starch plastics do not have vitality at all.
Regrettably, the vast majority of the products that have been put into production in my country are precisely of this type. Most of the products imported from abroad are either expensive and difficult to compete with the current plastics, or the technology is immature or cannot be completely degraded. Discontinued after commissioning
There are only a few enterprises that can form the real production capacity of fully degradable starch-based plastics, such as Harbin Luhuan Biodegradable Products Development Co., Ltd., Shaanxi Wangda Industrial Co., Ltd., Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, etc., but they are far from satisfying Market demand for environmentally friendly materials

Method used

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  • Method for preparing degradable starch-base plastics
  • Method for preparing degradable starch-base plastics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to cassava starch: glycerol: the ratio of water=1: 3: 0.1, mix 8min in the high-speed mixer (model SHR-100A, Zhangjiagang City Jincheng Plastic Machinery Factory), the rotating speed is 950rpm / min, then in single-screw extruder Medium plasticizing extrusion, the temperature is controlled at 165-170°C, and the rotational speed is controlled at 40-45r / min to make thermoplastic starch (TPS). Glycerin, water, and polyethylene glycol are premixed under heating conditions according to the ratio of glycerin: water: polyethylene glycol = 1:0.05:10, and slowly sprayed into a high-speed stirring mixer that has been mixed with thermoplastic starch and bagasse fibers Stir for 6 minutes, take it out and store it in a sealed bag, which can ensure that the plasticizer penetrates into the material. The above blend was plasticized by a twin-screw extruder at 160°C, glyoxal was added as a crosslinking agent, magnesium chloride was used as a catalyst, and the screw speed was 45r...

Embodiment 2

[0030] According to the ratio of cornstarch: glycerol: water=1: 4: 0.08, mix 10min in the high-speed mixer (model SHR-100A, Zhangjiagang City Jincheng Plastic Machinery Factory), the rotating speed is 950rpm / min, then in the single-screw extruder Medium plasticizing extrusion, the temperature is controlled at 165-170°C, and the rotational speed is controlled at 40-45r / min to make thermoplastic starch (TPS). Glycerin, water, and polyethylene glycol are pre-mixed under heating conditions according to the ratio of glycerin: water: polyethylene glycol = 1:0.2:5, and slowly sprayed into a high-speed stirring mixer that has been mixed with thermoplastic starch and bagasse fibers Stir for 8 minutes, take it out and store it in a sealed bag to ensure that the plasticizer penetrates into the material. The above blend was plasticized by a twin-screw extruder at 165°C, sodium trimetaphosphate was added as a crosslinking agent, zinc chloride was used as a catalyst, and the screw speed was...

Embodiment 3

[0034] According to the ratio of potato starch: glycerol: water=1: 3.5: 0.1, mix 8min in high-speed mixer (model SHR-100A, Zhangjiagang City Jincheng Plastic Machinery Factory), rotating speed is 950rpm / min, then in single-screw extruder Medium plasticizing extrusion, the temperature is controlled at 165-170°C, and the rotational speed is controlled at 40-45r / min to make thermoplastic starch (TPS). Glycerin, water, and polyethylene glycol are pre-mixed under heating conditions according to the ratio of glycerin: water: polyethylene glycol = 1:0.1:3, and slowly sprayed into a high-speed stirring mixer that has been mixed with thermoplastic starch and bagasse fibers Stir for 10 minutes, take it out and store it in a sealed bag to ensure that the plasticizer penetrates into the material. The above blend was plasticized by a twin-screw extruder at 160°C, glutaraldehyde was added as a cross-linking agent, magnesium chloride was used as a catalyst, and the screw speed was 50r / min, m...

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Abstract

The invention discloses a method for preparing degradable starch-base plastics. The method includes the steps: firstly, respectively preparing thermoplastic starch and sugarcane fibers; secondly, mixing the thermoplastic starch and the sugarcane fibers prepared in the first step in a mixing device and adding plasticizing agents into the mixing device to obtain polymer blend; and thirdly, adding crosslinking agents and catalysts into the polymer blend obtained in the second step at the temperature of 120-170 DEG C, plasticizing the polymer blend by the aid of a double-screw extruder and extruding melts to obtain the degradable starch-base plastics. The rotation speed of screws ranges from 30r / min to 50r / min. When the degradable starch-base plastics are prepared by the method, the sugarcane fibers are added to serve as filling agents, the cost of the degradable starch-base plastics can be reduced, the mechanical strength of the degradable starch-base plastics is enhanced, and the application performance of the degradable starch-base plastics is obviously improved.

Description

technical field [0001] The invention relates to the technical field of biodegradable materials, in particular to a method for preparing degradable starch-based plastics. Background technique [0002] In order to reduce the pollution of waste plastics to the environment and alleviate the energy crisis, people have tried to develop degradable plastics to replace ordinary plastic products for many years. Starch is a polysaccharide compound that widely exists in corn, wheat, potato, cassava and other plants. It has the advantages of wide source, low cost, and biodegradability. Therefore, it has long been used as a material for biodegradation research. Starch is a renewable resource and is cheap. Using it as a raw material can greatly reduce the dependence of the plastics industry on the petroleum industry. At the same time, as the development of biodegradable polymer products, it has complete biodegradability in various environments. After starch molecules are degraded or ashed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08L97/02B29C47/92C08K5/053B29C48/92
CPCB29C48/04B29C48/397B29C48/40B29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 胡玮
Owner NINGBO DELVERPHARM TECH