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Method for preparing degradable plastic master batch from soluble salt assisted plasticized amylose

A technology for plasticizing straight-chain and degradable plastics, which is applied in the field of degradable plastic masterbatches. It can solve the problems of reduced strength of thermoplastic starch, high straight-chain content, and inapplicability of pea starch, and achieve stable thermoplasticity, prevent recrystallization, and good thermoplasticity. Effect

Inactive Publication Date: 2021-01-22
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high linear chain content, it is also difficult to destroy the crystalline structure of pea starch. Even pea starch treated with plasticization and heat plasticization is easy to recrystallize after shelving or absorbing moisture, which affects the later thermoplastic processing and use. At the same time, after recrystallization The thermoplastic starch strength also decreases
Therefore, relying on traditional gelatinization and small molecule plasticized pea starch is no longer applicable

Method used

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  • Method for preparing degradable plastic master batch from soluble salt assisted plasticized amylose
  • Method for preparing degradable plastic master batch from soluble salt assisted plasticized amylose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of preparation of the method that soluble salt assists plasticized amylose to prepare degradable plastic masterbatch:

[0036] (1) Make a slurry by mixing Xingxing brand pea starch amylose from Gansu Xingxing Starch Food Co., Ltd. with sodium chloride soluble salt and water according to the mass ratio of 20:7:60, and place it in a stirring pot at 85-90°C Stir slowly and gelatinize to obtain starch gelatinized slurry for subsequent use;

[0037] (2) Combine the starch gelatinization slurry in step (1) with ethylene glycol plasticizer and polyadipate-1,4-butylene glycol ester diol with an average molecular weight of 2000 in a mass ratio of 100:3:4 Kneading, vacuuming and draining at 80°C to form pre-plasticized starch;

[0038] (3) Add the pre-plasticized starch (2) into the reactor, feed nitrogen into the reactor, add diphenylmethane-4.4'-diisocyanate at the same time, slowly stir and react at 80°C for 25 minutes, and then send the reaction material into the scre...

Embodiment 2

[0041] A kind of preparation of the method that soluble salt assists plasticized amylose to prepare degradable plastic masterbatch:

[0042] (1) Mix the Xingxing brand pea starch amylose from Gansu Xingxing Starch Food Co., Ltd. with calcium gluconate soluble salt and water to make a slurry according to the mass ratio of 24:7:60, and place it in a stirring pot at 80-85°C Stir slowly and gelatinize to obtain starch gelatinized slurry for subsequent use;

[0043] (2) Combine the starch gelatinization slurry in step (1) with ethylene glycol plasticizer and polyadipate-1,4-butylene glycol ester diol with an average molecular weight of 2000 according to the mass ratio of 100:4:4 Kneading, vacuuming and draining at 80°C to form pre-plasticized starch;

[0044] (3) Add the pre-plasticized starch (2) into the reactor, feed nitrogen into the reactor, add diphenylmethane-4.4'-diisocyanate at the same time, slowly stir and react at 80°C for 25 minutes, and then send the reaction materia...

Embodiment 3

[0047] A kind of preparation of the method that soluble salt assists plasticized amylose to prepare degradable plastic masterbatch:

[0048] (1). Make a slurry by mixing Xingxing brand pea starch amylose from Gansu Xingxing Starch Food Co., Ltd. with zinc acetate soluble salt and water according to the mass ratio of 28:7:80, and place it in a stirring pot at 80-90°C Stir slowly and gelatinize to obtain starch gelatinized slurry for subsequent use;

[0049] (2). The step (1) starch gelatinization slurry and ethylene glycol plasticizer, the average molecular weight is 2000 polyadipate-1,4-butylene glycol ester diol according to the mass ratio of 100:3:5 Carry out kneading, vacuumize and drain water at 80°C to form pre-plasticized starch;

[0050] (3). Add the pre-plasticized starch (2) into the reaction kettle, feed nitrogen into the reaction kettle, add diphenylmethane-4.4'-diisocyanate at the same time, slowly stir and react at 80°C for 25min, and then send the reaction mater...

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Abstract

The invention belongs to the technical field of degradable plastic master batches, and particularly relates to a method for preparing a degradable plastic master batch from soluble salt assisted plasticized amylose. The method comprises the following steps: preparing amylose, soluble salt and water into slurry, and slowly performing stirring and gelatinizing at 80-90 DEG C to obtain starch gelatinized slurry for later use; kneading the starch gelatinized slurry, an ethylene glycol plasticizer and polyadipate-1,4-butanediol ester diol, and carrying out vacuumizing and draining at 80-90 DEG C toform pre-plasticized starch; mixing pre-plasticized starch with diphenylmethane-4,4 '-diisocyanate in a nitrogen atmosphere, slowly performing stirring and reacting at 80-90 DEG C for 20-30 minutes,feeding the reaction material into a screw extruder, performing reacting and extruding at 110-120 DEG C under a vacuumizing condition, performing washing with water, and performing drying; and uniformly mixing the obtained dried material with glyceryl monostearate, glyceryl distearate, polyethylene wax and EVA, adding the mixture into a screw extruder for extrusion, and carrying out air cooling die surface granulation to obtain the degradable plastic master batch. The starch obtained by the invention has stable thermoplasticity.

Description

technical field [0001] The invention belongs to the technical field of degradable plastic master batches, and in particular relates to a method for preparing degradable plastic master batches by assisting plasticizing amylose with soluble salts. Background technique [0002] In order to solve the problem of plastic pollution, biodegradable plastics have been rapidly popularized and applied in recent years, and more and more degradable plastics have begun to replace traditional plastics in various fields such as films, injection molded parts, and sheet packaging. At present, most of the degradable plastics are biodegradable plastics. Because biodegradable plastics contain active groups such as hydroxyl, ester, and carboxyl groups that are easily decomposed by microorganisms, when they are placed in the natural environment at a certain temperature and humidity, they will be swallowed by microorganisms. It can be easily decomposed into water and carbon dioxide, thus returning t...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08L23/06C08L23/08C08K5/103C08G18/76C08G18/66C08G18/64C08G18/42C08G18/40C08G18/32
CPCC08G18/3206C08G18/4081C08G18/4238C08G18/6484C08G18/664C08G18/7671C08L75/04C08L2201/06C08L2205/03C08L23/06C08L23/0853C08K5/103
Inventor 陈庆曾军堂白涛司文彬
Owner CHENDU NEW KELI CHEM SCI CO LTD
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