High thermotolerance polylactic acid composite material filled by french chalk and method for preparing same

A composite material and talc technology are applied in the field of talc-filled biodegradable polylactic acid composite materials and their preparation fields, which can solve the problems of affecting the biodegradability of products, long isothermal crystallization treatment time, low production efficiency, and the like. The effect of short annealing time, strong processing performance and low price

Inactive Publication Date: 2008-12-31
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN101020781A discloses a heat-resistant polylactic acid-based composite material and its preparation method. Using the synergistic effect of strengthening radiation crosslinking and fiber composite, the thermal deformation temperature of PLA is greatly increased from 55°C to about 150°C. It can produce cross-linking after enhanced radiation, and the composition of the material needs to contain vinyl multifunctional monomers, which will affect the biodegradability of the product
Patent CN101157793A introduces a heat-resistant polylactic acid blend and its preparation method. The degree of crystallization of the polylactic acid blend can be improved by isothermal crystallization treatment, which can effectively improve the heat resistance of the polylactic acid blend, but its isothermal The processing time of crystallization is too long, it takes about 1 hour, and the production efficiency is low, so it is not suitable for direct use in large-scale industrial production

Method used

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  • High thermotolerance polylactic acid composite material filled by french chalk and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 100 parts of vacuum-dried polylactic acid were melted and blended in a kneader at a temperature of 190 ° C and a speed of 32 rpm for 4 minutes, and then melted and blended for 4 minutes at a speed of 64 rpm, and then in a thermocompression molding machine at a temperature of 190°C and 15 MPa pressure for 5 minutes, and finally the hot-pressed sample was annealed at 120°C for 5 minutes to form a 4.0mm sheet. Its mechanical properties and heat resistance are listed in Table 1.

Embodiment 2

[0040] 98 parts of vacuum-dried semi-crystalline poly L-lactic acid, 1 part of talc powder, 0.2 part of heat stabilizer maleic anhydride, 0.5 part of talc surface passivator GT7072, 0.3 part of lubricant aluminum stearate in a kneader In the process, melt blending at a temperature of 190°C and a speed of 32rpm for 4min, then melt blending at a speed of 64rpm for 4min, and then heat in a thermocompression molding machine at a temperature of 190°C and a pressure of 15MPa. Press molding for 5 minutes, and finally anneal the hot-pressed sample at 120°C for 4 minutes to form a 4.0mm sheet. Its mechanical properties and heat resistance are listed in Table 1.

Embodiment 3

[0042]Vacuum-dried semi-crystalline poly L-lactic acid 94 parts, modified talc powder 5 parts, heat stabilizer maleic anhydride 0.2 part, talcum powder surface passivator epoxy resin Araldite GT7072 0.5 part, lubricant stearic acid 0.3 parts of aluminum were melt blended in a kneader at a temperature of 190°C and a speed of 32rpm for 4 minutes, and then melted and blended at a speed of 64rpm for 4 minutes, and then in a thermocompression molding machine at a temperature of 190°C and a pressure of Under the condition of 15MPa, it was hot-pressed for 5 minutes, and finally the hot-pressed sample was annealed at 120°C for 5 minutes to form a 4.0mm sheet. Its mechanical properties and heat resistance are listed in Table 1. The displacement-temperature curve of its Vicat test is shown in Figure 1.

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Abstract

The invention relates to polylactic acid composite material which takes heat resistant talcum powder as filler and a preparation method thereof. The polylactic acid composite material contains(based on weight portion) 59-98 portions of semi-crystalline poly-L-lactic acid, 1-40 portions of modified talcum powder, 0.1-1.0 portions of heat stabilizer, 0.2-1.5 portions of talcum powder surface passivator and 0.05-1.0poritons of lubricant. The polylactic acid composite material is prepared through the following steps: firstly, preparing modified talcum powder; then batching according to the composition of the polylactic acid composite material, stirring and mixing to be even, putting the mixture into a kneader, and melting and blending under 160-200DEG C; hot press molding under 10-20MPa and finally annealing under 100-120 DEG C. The composite material is applicable in automobile and house appliance fields. The polylactic acid composite material can not only be biologically degraded but also has excellent mechanical property and heat resistance. The filler adopted by the invention is low in cost, simple in preparation process and short in process period and can be realized in large-scale industrial production.

Description

technical field [0001] The present invention relates to polymer composite materials, in particular to a high heat-resistant talc powder-filled biodegradable polylactic acid composite material and a preparation method thereof. This type of composite material is used in the fields of automobiles and home appliances, such as instrument panels and door panels. , Door guards, sub-dashboards, glove boxes, decorative pillars and other automotive interior and exterior trims have broad application prospects. Background technique [0002] With human beings advocating nature, the need to return to nature and the increasing awareness of environmental protection, the 21st century has become a century of green environmental protection. Vigorously developing new biodegradable materials has become one of the current trends in the development of material technology in the world. In order to solve the white pollution caused by waste plastics, scientific research institutions and enterprises ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K13/06C08K9/06C08K5/09C08K5/098C08K5/1515B29B7/00B29B11/12
Inventor 尹静波李孝秀鲁晓春王尹杰杨艳颜世峰陈学思
Owner SHANGHAI UNIV
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