Preparation method for modified starch based polyethylene plastic

A polyethylene plastic and starch-based technology, applied in the field of preparation of modified starch-based polyethylene plastics, can solve the problems of inability to meet market requirements of materials, poor degradability, poor flame retardancy, etc., achieve excellent biodegradability, improve water resistance, etc. The effect of slowing down heat and mass transfer

Inactive Publication Date: 2018-09-28
钱兴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention: Aiming at the defects of poor flame retardancy, poor degradability and poor water resistance of common polyethylene plastics, which cannot meet the requirements of the material market, a preparation method of modified starch-based polyethylene plastics is provided

Method used

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  • Preparation method for modified starch based polyethylene plastic

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example 1

[0023]Put potato starch and deionized water in a beaker at a mass ratio of 1:7, mix and stir for 16 minutes at a temperature of 80°C to obtain a starch paste, cool naturally to 24°C, and adjust with hydrochloric acid with a mass fraction of 11%. The pH value of the starch paste reaches 5 to obtain a starch mixture, then add isoamylase with 1% of the mass of the starch mixture to the starch mixture, stir and enzymolyze at a temperature of 32°C for 47 minutes, filter to remove the filter residue, and obtain a filtrate It is the starch reaction solution; then the starch reaction solution, 3% sodium hydroxide solution, epichlorohydrin and succinic anhydride are mixed according to the mass ratio of 5:1:2:1, and the temperature is 35 ° C Stir and react for 21 minutes to obtain a mixed solution, continue to put the mixed solution into a suction filter and filter for 3 times, remove the filtrate to obtain a solid, air-dry naturally, grind and discharge, and obtain modified starch granu...

example 2

[0025] Put potato starch and deionized water in a beaker at a mass ratio of 1:7, mix and stir for 17 minutes at a temperature of 82°C to obtain a starch paste, cool naturally to 28°C, and adjust with hydrochloric acid with a mass fraction of 11%. The pH value of the starch paste reaches 5 to obtain a starch mixture, then add isoamylase with 1% of the mass of the starch mixture to the starch mixture, stir and enzymolyze at a temperature of 34°C for 49 minutes, filter to remove the filter residue, and obtain a filtrate It is the starch reaction solution; then mix the starch reaction solution, 3% sodium hydroxide solution, epichlorohydrin and succinic anhydride in a mass ratio of 5:1:2:1, and mix at a temperature of 37°C Stir and react for 22 minutes to obtain a mixed solution, continue to put the mixed solution into a suction filter and filter 4 times, remove the filtrate to obtain a solid, air-dry naturally, grind and discharge, and obtain modified starch granules; weigh 6 mL of...

example 3

[0027] Put potato starch and deionized water in a beaker at a mass ratio of 1:7, mix and stir for 18 minutes at a temperature of 85°C to obtain a starch paste, cool naturally to 32°C, and adjust with hydrochloric acid with a mass fraction of 11%. The pH value of the starch paste reaches 6 to obtain a starch mixture, then add isoamylase with 1% of the mass of the starch mixture to the starch mixture, stir and enzymolyze at a temperature of 35°C for 52 minutes, filter to remove the filter residue, and obtain a filtrate It is the starch reaction solution; then the starch reaction solution, 3% sodium hydroxide solution, epichlorohydrin and succinic anhydride are mixed according to the mass ratio of 5:1:2:1, and the temperature is 40°C Stir and react for 24 minutes to obtain a mixed solution, continue to put the mixed solution into a suction filter and filter it for 5 times, remove the filtrate to obtain a solid, air-dry naturally, grind and discharge, and obtain modified starch gra...

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Abstract

The invention discloses a preparation method for modified starch based polyethylene plastic, belonging to the technical field of plastic preparation. According to the invention, antimonous oxide and red phosphorus are utilized to modify polyethylene, and polyethylene is unaffected in the decomposition process of the antimonous oxide and the red phosphorus under heating; epichlorohydrin and succinic anhydride are utilized for double modification of potato starch, and a substrate forms an interface with a certain strength under the action of modified starch; the polyethylene generates graft copolymerization, oxidation and esterification chemical reactions with the active hydroxyl group in starch, and the potato starch has excellent biodegradability and is free of toxicity and irritation; tetrabutyl titanate, carbon tetrachloride and the like are mixed under stirring to generate a reaction to prepare TiO2 catalytic powder by adopting a sol-gel method, and the TiO2 catalytic powder generates electrons and holes under the excitation of ultraviolet light and has strong oxidation reduction ability, so degradability of polyethylene plastic is further improved; thus, the preparation methodprovided by the invention has broad application prospects.

Description

technical field [0001] The invention discloses a preparation method of modified starch-based polyethylene plastic, which belongs to the technical field of plastic preparation. Background technique [0002] Polyethylene plastic (referred to as: PE), is one of the five major synthetic resins, and it is the variety with the largest production capacity and the largest import volume among synthetic resins in my country. It has corrosion resistance, excellent electrical insulation (especially high-frequency insulation), and can be chlorinated and irradiated. Mainly used in sectors such as packaging, agriculture and transportation. [0003] Polyethylene is widely used in many aspects such as plastic packaging materials, foam materials, woven cloth materials, and cable covering materials. But its oxygen index is only 18.5, which makes it a flammable material, which limits their applications. In order to improve the flame retardancy of polyethylene materials, halogen-containing fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L3/06C08K13/02C08K3/02C08K5/09C08K3/22C08B30/12C08B31/00C08B31/04
CPCC08B30/12C08B31/006C08B31/04C08K2003/026C08K2003/2241C08L23/06C08L2201/02C08L2201/08C08L3/06C08K13/02C08K3/2279C08K3/02C08K5/09C08K3/22
Inventor 钱兴杨明忠陈可
Owner 钱兴
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