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Thermoplastic starch (TPS), biodegradable polyester/starch composite material and preparation thereof

A technology for biodegrading polyester and thermoplastic starch, applied in the field of biodegradable composite materials, can solve problems such as the influence of the stability of composite materials and the reduction of mechanical properties

Active Publication Date: 2012-01-18
肖同剑
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the stability of TPS and the corresponding composite materials are greatly affected, reducing their mechanical properties, etc.

Method used

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  • Thermoplastic starch (TPS), biodegradable polyester/starch composite material and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0095] Preparation of TPS

[0096] In the process of the present invention, the components for preparing TPS include, for example: 20 to 80 parts of starch, 0.01 to 10 parts of reaction activator, 5 to 40 parts of polyester prepolymer carrier, 0.01 to 10 parts of catalytic deactivator , 5 to 50 parts of more than one plasticizer. The processing temperature is between 50 and 150 degrees Celsius.

[0097] Described thermoplastic starch is prepared by following method:

[0098] Condensation polymerize biodegradable polyester monomers, and form biodegradable polymer prepolymers with active end groups with reaction activators;

[0099] The starch is reacted with the active end group of the prepolymer of the biodegradable polymer to form a polyester-TPS graft copolymer; that is, the thermoplastic starch.

[0100] In a specific embodiment, the polycondensation synthesis conditions of the biodegradable prepolymer are: the temperature is from 80 to 220 degrees Celsius, and the rea...

Embodiment 1

[0120] Preparation of Prepolymers of Biodegradable Polyesters with Active Functional Groups by Direct Condensation Polymerization

[0121] Add 16.4 kg of 1,4-butanediol (99%), 17.7 kg of succinic acid and 4.3 kg of adipic acid in a 50L reactor with a heating and stirring reactor, add 194.0 g of tetratitanate after mixing Butyl ester (99%) was added as reaction catalyst. The temperature of the mixed reaction was set at 120 degrees Celsius, and the temperature was raised to 180 degrees Celsius at a rate of 30 degrees Celsius per hour, and kept at each temperature point for 5 hours, and kept stirring. While heating up, turn on the vacuum system and reduce to a vacuum of 50 mbar at a speed of 100 mbar / hour. Then, increase the temperature to 220 degrees Celsius and keep it for 5 hours. Thereafter, the vacuum was released and 963.0 grams of a commercially available ADR 4368C model was added to the reactor and the prepolymer was allowed to react for 30 minutes from the side feed po...

Embodiment 2

[0122] [embodiment 2] utilize prepolymer to prepare thermoplastic starch (TPS)

[0123] 12.0 kilograms of cornstarch, 4.0 kilograms of glycerol, 2.06 kilograms of prepolymers of biodegradable polyester (prepared in Example 1), 400 grams of urea, 1.0 kilograms of talcum powder, 600 grams of calcium stearate and 10.0 grams of benzoyl peroxide first in Mixed with a high-speed mixer, and then extruded with a co-rotating twin-screw extruder. Typical extrusion stage settings for TPS preparation are: 60··140°C, screw speed 150rpm. After the extruded TPS strips are cooled by the conveyor belt and wind, they are granulated for later use.

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Abstract

The invention provides thermoplastic starch (TPS), which comprises the following ingredients: 20 to 80 weight parts of starch, 5 to 40 weight parts of biodegradable polyester prepolymers, 0.01 to 10 weight parts of reaction active agents, 0.01 to 10 weight parts of catalytic devitalizing agents, 0.01 to 1.0 weight part of antioxidant and 5 to 50 weight parts of auxiliaries, wherein the molecular weight of the prepolymer is 10,000 to 100,000 Daltons, the viscosity number range is 0.30 to 1.2 deciliters per gram and is measured through a Ubbclohde viscosity method, the melting point range is 60to 180 DEG C, and the end reaction group content is 1.0 to 20.0 meq / Kg and is measured by an end group titration method. The invention also provides a biodegradable polyester / starch composite material containing the thermoplastic starch and a preparation method thereof.

Description

technical field [0001] The invention relates to a novel biodegradable material and a preparation method thereof. It specifically involves the preparation of thermoplastic starch with biodegradable polyester prepolymer as a carrier, and compounding with biodegradable polyester and additives to form a new type of biodegradable composite material, which can be used for processing films, sheets, profiles, injection molding and containers, etc. . Background technique [0002] Biodegradable composite materials are considered to be one of the effective methods to solve the problem of "white pollution", because they can be degraded into carbon dioxide and water by microorganisms in composting plants, with little impact on the environment and reduced treatment costs. In addition, the matrix in these biodegradable materials, such as: polyhydroxyalkanoate (PHAs), polylactic acid (PLA) and starch, etc., comes from renewable resources, which also compensates the consumption and reductio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08G63/91C08B31/00C08L87/00C08L67/00C08L67/04C08L67/02
CPCC08L87/00C08L3/02C08L67/04C08L67/02C08G81/00C08L67/00C08G63/91C08B31/00C08K5/0008C08K5/005B29B7/92B29B7/007B29B7/726C08L101/16
Inventor 侯连龙
Owner 肖同剑
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