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Heat resistant polylactic acid-base composite material and its prepn process

A composite material, polylactic acid technology, applied in the field of heat-resistant polylactic acid-based composite materials and its preparation, can solve the problems of low production efficiency, limited improvement range, and inability to industrialize large-scale production

Inactive Publication Date: 2007-08-22
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

In 2006, an article published by M. Huda et al. in Composite Materials Science and Technology pointed out (Composites Science and Technology, 2006, 66, 1813-1824), due to the poor interfacial compatibility between the PLA matrix and the fibrous filler, it cannot pass through pure fiber Composite approach to improve heat resistance of PLA
Deng Pengyang et al. (Chinese invention patent application number: 200510017296.9) increased the glass transition temperature of PLA by strengthening radiation crosslinking, but the increase was limited, so this method could not independently solve the weakness of PLA's poor heat resistance
In 2006, S. Serizawa et al. pointed out in the Journal of Applied Polymer Science (Journal of Applied PolymerScierce, 2006, 100, 618-624) that the degree of crystallization of PLA / fiber composites can be improved by annealing, which can effectively improve the composite material. heat resistance, but this method cannot be directly used in industrialized mass production due to low production efficiency
At present, there is no method that can meet the requirements of industrial mass production and effectively improve the heat resistance of PLA.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9

[0017] Among the embodiment 1-9, the average weighing molecular weight is 5000g of PLA of 83,000, 250g of triallyl isocyanurate of vinyl functional group monomer, 50g of heat stabilizer triphenyl phosphite, antioxidant 3,5-di tert-butyl-4-hydroxybenzyl diethyl phosphate 100g, the wood fiber is 250g, 300g, 500g, 700g, 1000g, 1300g, 1500g, 2000g, 2500g; put various raw materials weighed in proportion into the mixer Mix evenly in the middle, put the mixed material into the twin-screw extruder, and the extrusion temperature corresponds to the inlet temperature of 100°C, 105°C, 110°C, 105°C, 115°C, 115°C, 115°C, respectively. 120°C, 120°C, the maximum processing temperature is 150°C, 155°C, 160°C, 160°C, 165°C, 165°C, 165°C, 170°C, 170°C, the die head temperature is 160°C, the finished mother After the material is dried in vacuum, it is injection molded with an injection machine, and the injection molding temperature corresponds to the inlet temperature of 120°C, 125°C, 125°C, 125°...

Embodiment 10-18

[0022] Among the embodiments 10-18, the average weighted molecular weight is 120,000 PLA500g, vinyl functional group monomer triallyl isocyanurate 150g, heat stabilizer triphenyl phosphite 150g, antioxidant β-(4- Hydroxy-3,5-di-tert-butylphenyl) n-octadecyl propionate 150g, the paper fiber content is successively 250g, 300g, 500g, 700g, 1000g, 1300g, 1500g, 2000g and 2500g. The preparation process is as in Example 1-9. The irradiation dose was 1 Mrad, and a heat-resistant polylactic acid-based composite material was obtained. The heat distortion temperature change of this heat-resistant PLA-based composite is shown in Table 2.

[0023] Table 2: Changes in thermal denaturation temperature of PLA before and after irradiation crosslinking

[0024] Example

Embodiment 19-27

[0026] Among the embodiments 19-27, the average weighted molecular weight is 5000g of PLA of 300,000, 350g of triallyl isocyanurate of vinyl functional group monomer, 250g of heat stabilizer triphenyl phosphite, antioxidant 3,5-di tert-butyl-4-hydroxybenzyl diethyl phosphate 50g, glass fibers are 250g, 300g, 500g, 700g, 1000g, 1300g, 1500g, 2000g and 2500g; the preparation process is as in Example 1-9, and the irradiation dose is 5Mrad, a heat-resistant polylactic acid-based composite material was obtained. The heat distortion temperature change of this heat-resistant PLA-based composite is shown in Table 3.

[0027] Table 3: Changes in thermal denaturation temperature of PLA before and after irradiation crosslinking

[0028] Example

[0029] 21

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Abstract

The present invention relates to one kind of heat resistant polylactic acid-base composite material and its preparation process. The polylactic acid-base composite material is prepared with polylactic acid 100 weight portions, fiber 5-50 weight portions, antioxidant 0.5-3 weight portions, heat stabilizer 0.5-3 weight portions and vinyl radical polyfunctional monomer 1-10 weight portions, and through mixing, pelletizing in a double screw extruder, drying, injection molding and irradiation cross-linking with a Co-60 source or an electronic accelerator. It has the Vicat softening point raised from 55-80 deg.c to 150 deg.c.

Description

technical field [0001] The invention relates to a heat-resistant polylactic acid-based composite material and a preparation method thereof. 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 ser...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K7/14B29C47/40B29C47/92C08J3/28C08K5/524C08K5/29C08K5/521B29C48/40B29C48/92
CPCB29C47/92B29C48/04B29C48/40
Inventor 邓鹏飏刘南安柳美华董丽松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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