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Preparation method of heat resisting polylactic acid based resin

A technology of matrix resin and polylactic acid is applied in the field of preparation of heat-resistant polylactic acid matrix resin, which can solve the problems of poor heat resistance and the like

Inactive Publication Date: 2008-10-15
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the disadvantages of poor heat resistance of polylactic acid, and utilize the advantages of polymer blend alloy modification and radiation-induced crosslinking to form a chemical bond on the two-phase interface region of polylactic acid and ethylene vinyl alcohol copolymer, Strong interfacial interaction will enable the crystallization region of ethylene vinyl alcohol to become a stress concentration point at high temperature, thereby reducing the occurrence of high-temperature thermal deformation of the alloy system; at the same time, by controlling the degree of cross-linking of the alloy system, it can ensure that the alloy system remains stable. Capable of repeated melt processing

Method used

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  • Preparation method of heat resisting polylactic acid based resin
  • Preparation method of heat resisting polylactic acid based resin
  • Preparation method of heat resisting polylactic acid based resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0015] In Example 1-5, 8.0kg of dried polylactic acid resin was weighed, 2.0kg of ethylene vinyl alcohol resin (the molar percentage of vinyl alcohol was 56%), 150g of combined auxiliary agent, and 100g of vinyl multifunctional monomer TAIC , 300g, 500g, 700g and 1.0kg. The above materials are mixed evenly, and then put into a twin-screw extruder with 6 heating zones for melt blending. The temperature range of each zone is 135±5°C, 155±5°C, 175±5°C, 185±5°C. ℃, 195±5℃, 185±5℃, the die head temperature is 180±5℃, and the basic material is prepared into a masterbatch through cold granulation. After the masterbatch is dried at 100°C, it is vacuum-packed with a polyethylene plastic bag, and then put into a cobalt source to irradiate 10kGy, 30kGy, 50kGy, 70kGy and 100kGy respectively to obtain a heat-resistant polylactic acid matrix resin.

[0016] Then hot press it into a 4mm plate, and test the heat distortion temperature of the sample according to GB / T1633. The results are show...

Embodiment 6-10

[0022] In Examples 6-10, 6.0kg of polylactic acid, 4.0kg of ethylene vinyl alcohol (the molar percentage of vinyl alcohol is 68%), 300g of combined auxiliary agent, and 100g, 300g, and 500g of vinyl polyfunctional monomer TAIC were weighed in sequence. , 700g and 1.0kg. Processing technology and test sample preparation and testing methods are the same as in Examples 1-5.

[0023] Table 2: Changes in heat resistance and secondary melting properties of polylactic acid matrix resin after irradiation

[0024]

[0025] a: HDT is heat distortion temperature

[0026] b: ◎The reworkability is excellent, ○The reworkability is good, √The reworkability is fair

Embodiment 11-15

[0028] In Examples 11-15, 5.0 kg of polylactic acid, 5.0 kg of ethylene vinyl alcohol (the molar percentage of vinyl alcohol is 56%), 100 g of combined additives, and 100 g, 300 g, and 500 g of vinyl polyfunctional monomer TAIC were weighed in sequence. , 700g and 1.0kg. Processing technology and test sample preparation and testing methods are the same as in Examples 1-5.

[0029] Table 3: Changes in heat resistance and secondary melting properties of polylactic acid matrix resin after irradiation

[0030]

[0031] a: HDT is heat distortion temperature

[0032] b: Excellent in ◎ reworkability, good in ○ reworkability, and fair in √workability.

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Abstract

The invention relates to heat resistant polylactic resin and a method for preparing the same. The compositions of the raw materials in percentage by weight are: 50 to 80 percent of polylactic acids, 20 to 50 percent of ethylene-ethanol copolymer, 3 to 10 percent of ethylene polyfunctional group monomer and 1 to 3 percent of combined addition agent. The method comprises the following steps that: the raw materials which are uniformly mixed according to the mixture ratio are prepared into non-crosslinked resin master batches through the melting and processing means and then the master batches are radiated to determined dosage by utilization of cobalt source so as to prepare the radiant micro-crosslinking polylactic matrix resin with low gel content. The thermal distortion temperature of the resin is greatly raised from 70 DEG C or so under the non-crosslinked condition to over 100 DEG C. Moreover, the resin has the capacity of secondary melting and processing, thereby the resin can be used as matrix resin and can be mixed with other materials to prepare high-performance polylactic products, thereby the resin has wide application prospect.

Description

technical field [0001] The invention relates to a preparation method of a heat-resistant polylactic acid matrix resin. Background technique [0002] With the depletion of disposable fossil resources (such as petroleum and coal) and the increasing white pollution caused by the extensive use of petroleum-based products, people have found that only renewable natural resources can be used to produce products that can meet people's needs, and in Degrades to CO after use 2 And water, to realize the recycling of natural resources, is the only way for human society to achieve sustainable development. Considering both resources and environment, biodegradable polyester materials have gradually become the focus of people's attention, especially polylactic acid (PLA) has attracted people's attention. Polylactic acid is a polymer material with good processing performance and physical and mechanical properties, which is made from starch and synthesized through a series of biochemical in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L29/04C08K5/523C08K5/1515C08K5/526C08K5/134B29C47/92C08J3/28C08J3/24B29C48/40B29C48/92
CPCB29C47/92B29C48/92B29C2948/92704B29C48/40B29C48/9185B29C2948/92895B29C2948/92904
Inventor 邓鹏飏柳美华郑晓伟董丽松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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