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PBAT/starch full biodegradation thin film and preparation method thereof

A technology of butylene adipate and polyterephthalic acid, applied in the field of materials, can solve the problems of reduced material cost, low tensile strength, low tear strength, etc.

Pending Publication Date: 2019-06-25
浙江中科应化科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, the cost of materials can be greatly reduced by blending and modifying with starch. At the same time, starch is a degradable natural polymer. Polybutylene terephthalate-adipate / The cost of starch film is greatly reduced, and the film has a wide range of application prospects, but the mechanical properties of the film, including tensile strength and tear resistance, are low. How to make good use of these existing technologies to provide film products with better performance has become an art field One of the important issues to be resolved

Method used

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  • PBAT/starch full biodegradation thin film and preparation method thereof
  • PBAT/starch full biodegradation thin film and preparation method thereof

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preparation example Construction

[0044] The invention provides a preparation method of polybutylene terephthalate-adipate / starch fully biodegradable film, comprising:

[0045] Mixing starch with a modifier for modification treatment to obtain modified starch;

[0046] Mix and extrude polybutylene terephthalate-adipate resin, modified starch, reinforcing agent, lubricant, and small-molecule plasticizer to obtain the resin for film blowing;

[0047] The blown film is blown with the resin to obtain the polybutylene terephthalate-adipate / starch fully biodegradable film.

[0048] The preparation method of a polybutylene terephthalate-adipate / starch fully biodegradable film provided by the present invention first mixes starch with a modifier for modification treatment to obtain modified starch.

[0049] The weight ratio of starch and modifier in the modified starch is preferably (90-100): (1-3); more preferably (93-100): (1-2.5); most preferably (95-100 ): (1~2); The starch is preferably corn starch.

[0050] Mi...

Embodiment 1

[0060] (1) Weigh 98.5 parts of starch, 1 part of maleic anhydride, and 0.5 parts of titanate coupling agent; the order of addition is starch, maleic anhydride, and titanate coupling agent; 90°C, continue to stir for about 3 minutes to discharge, and obtain modified starch;

[0061] (2) Weigh 60 parts of PBAT, 25 parts of modified starch, 10 parts of sorbitol liquid, 5 parts of talcum powder, 1 part of erucamide, and 1 part of ethylene bisstearamide;

[0062] (3) Add each raw material into the high-speed mixer in a certain order, and the order of addition is PBAT, modified starch, talc powder, erucamide, ethylene bisstearamide, and sorbitol liquid; the mixing speed is turned to high speed , high-speed stirring for about 10 minutes to discharge;

[0063] (4) Add the mixed raw materials into the hopper of the twin-screw extruder, set the processing temperature in each temperature zone of the extruder, the operating temperature is 100-180°C, and obtain the PBAT modified resin thr...

Embodiment 2

[0066] (1) Weigh 98.5 parts of starch, 1 part of maleic anhydride, and 0.5 parts of titanate coupling agent; the order of addition is starch, maleic anhydride, and titanate coupling agent; turn the mixing speed to high speed and stir at high speed to 90°C, continue to stir for about 3 minutes to discharge, and obtain modified starch;

[0067] (2) Weigh 55 parts of PBAT, 35 parts of modified starch, 10 parts of sorbitol, 0.5 part of erucamide, and 0.5 part of ethylene bis-stearamide;

[0068] (3) Add the raw materials into the high-speed mixer in a certain order, and the order of addition is PBAT, starch, erucamide, ethylene bisstearamide, and sorbitol; turn the mixing speed to high speed, and stir at high speed for about 10 minutes ready to discharge;

[0069] (4) Add the mixed raw materials into the hopper of the twin-screw extruder, set the processing temperature in each temperature zone of the extruder, the operating temperature is 100-180°C, and obtain the PBAT modified r...

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Abstract

The invention provides a PBAT / starch full biodegradation composition, which is characterized by being prepared from the following raw materials: 50 to 85 weight parts of PBAT, 10 to 40 weight parts ofmodified starch, 0.3 to 3 weight parts of lubricating agents, 5 to 15 weight parts of small molecule plasticizers and 1 to 5 weight parts of enhancing agents, wherein the modified starch is starch modified by a modifying agent; the modifying agent is a mixture of one of maleic anhydride and butanedioic anhydride, and one of titanium ester coupling agents, aluminic acid ester coupling agents and silane coupling agents. By mixing PBAT resin, the modified starch and the rest auxiliary agents, and combining the specific proportion, a thin film prepared by the finally prepared composition has theadvantages of high tensile and tear strength, good elasticity modulus, good elongation at break, high density, high degradation performance and the like.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a polybutylene terephthalate-adipate / starch fully biodegradable film and a preparation method thereof. Background technique [0002] The environmental pollution caused by petroleum-based plastics is becoming more and more serious, and there is an urgent need to replace them with fully degradable plastics. Polybutylene terephthalate-adipate (PBAT) is a fully degradable plastic widely studied at home and abroad. However, the thin film prepared by pure PBAT is soft, has low strength and high cost, which is limited in many application fields. Therefore, in the application process, PBAT is usually blended with other materials to improve its application performance. [0003] The high raw material cost of PBAT is a major factor limiting its promotion and use. Therefore, it is a necessary process to add low-cost fillers for blending modification during PBAT processing. Ning et al. r...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L3/04C08K13/02C08K3/34C08K5/20C08K5/1545C08J5/18
Inventor 张会良杨佳金宝昌边俊甲贾世玲张仁昊杨慧丽韩立晶董丽松
Owner 浙江中科应化科技有限公司
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