Method for preparing polylactic acid foam material

A polylactic acid foaming and polylactic acid technology, which is applied to the preparation of PLA rigid foaming materials and polylactic acid foaming materials, can solve the problems of difficult foaming material density, high cost, and high mold requirements, and achieve good barrier properties. , low cost, controllable density effect

Inactive Publication Date: 2009-02-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires water vapor generation equipment and high mold requirements, and the density of foamed materials is difficult to control; UNITIKA cooperates with the development technology of heat-resistant polylactic acid nanocomposite materials to carry out nano-level molecular design, chemical modification technology and special melt mixing technology. To improve the melt strength of polylactic acid, use supercritical carbon dioxide to develop high-magnification polylactic acid extruded foam sheet (patent JP2004051803-A), this method requires special equipment and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The raw material components are by weight: 90 parts of polylactic acid, 5 parts of viscosity modifier polymethyl methacrylate, 0.5 part of antioxidant tris (2,4-di-tert-butylphenyl) phosphite, 0.5 Parts of antioxidant β-(4-hydroxyphenyl-3,5-di-tert-butyl) n-octadecyl propionate, 2 parts of foaming agent OBSH, 1 part of foaming aid zinc oxide, 1 part of foam Pore ​​Stabilizer Sodium Lauryl Sulfate.

[0018] Polylactic acid, polymethyl methacrylate, β(3,5-di-tert-butyl-4-hydroxyphenyl) methyl propionate, β-(4-hydroxyphenyl-3,5-di-tert-butyl base) n-octadecanyl propionate, foaming agent OBSH, zinc oxide and sodium lauryl sulfate were mixed on a mixer at 100°C for 30 minutes at a speed of 600 rpm. Dry for 30 hours, then put the baked primary mixture into a mold, and mold and foam it on a vulcanizing machine at a temperature of 180°C and a pressure of 50MPa for 30 minutes to obtain a density of 0.50g / cm 3 Rigid polylactic acid foam material with uniform cells.

Embodiment 2

[0020] The raw material components are by weight: 50 parts of polylactic acid, 40 parts of viscosity modifier ethylene-acrylate copolymer, 0.1 part of antioxidant N, N'-bis[3-(3,5-di-tert-butyl -4-hydroxyphenyl)propionyl]hydrazine, 0.1 part of antioxidant 2,6-di-tert-butyl-4-methylphenol, 7 parts of foaming agent AC, 1.5 parts of foaming aid kaolin, 1.1 parts of foam Pore ​​stabilizer sodium α-olefin sulfonate, 0.2 parts release agent silicone oil.

[0021] First polylactic acid, ethylene-acrylate copolymer, N,N'-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionyl]hydrazine, 2,6-di-tert-butyl - 4-Methylphenol, foaming agent AC, kaolin, sodium α-alkenyl sulfonate, silicone oil were mixed on a mixer at 170°C for 5 minutes, and the speed was 8000 rpm. After the material was cooled, it was placed in a vacuum oven at 120°C Dry for 6 hours, then put the baked primary mixture into a mold, and mold and foam it on a vulcanizing machine with a temperature of 220°C and a pressure of 5MP...

Embodiment 3

[0023] The raw material components are by weight: 70 parts of polylactic acid, 18 parts of tackifier modifier phenolic resin, 1 part of tackifier modifier dicumyl peroxide, 1 part of tackifier modifier hexamethylene diisocyanate , 1 part of antioxidant 4,4'methylene bis(2,6-di-tert-butylphenol), 1.5 parts of antioxidant dilauryl thiodipropionate, 3 parts of foaming agent OBSH, 1 part of bicarbonate Sodium, 1 part of foaming aid stearic acid, 0.5 part of foaming aid wollastonite, 1 part of cell stabilizer titanate coupling agent, 1 part of release agent silicone.

[0024] First polylactic acid, phenolic resin, dicumyl peroxide, hexamethylene diisocyanate, 4,4'methylene bis(2,6-di-tert-butylphenol), dilauryl thiodipropionate, The foaming agent OBSH, sodium bicarbonate, stearic acid, wollastonite, titanate coupling agent, and silicone were mixed on a mixer at 150°C for 15 minutes at a speed of 4500 rpm. After the material was cooled, it was placed in a vacuum oven Dry at 90°C fo...

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Abstract

The invention relates to a preparation method for an expanded material of polylactic acid; the polylactic acid, a tackifying modifier, a chemical inhibitor, a vesicant, a foaming accessory ingredient, a abscess stabilizer and a parting agent are mixed under high temperature according to a certain proportion to obtain a basic mixture; then the basic mixture is arranged in a die to carry out moulding foaming on a vulcanizing machine with a certain temperature and a certain pressure to manufacture the foaming material of polylactic acid. The foaming material of polylactic acid manufactured by the method of the invention has excellent performances of being biodegradable, controllable density, easy processing as well as good barrier property, has similar foaming shaping performance and shock-absorbing capacity with polystyrene, can replace the foaming material of polystyrene, can be used as the materials for heat isolating, sound isolating and shock absorption and has broad application in the fields of cushion packaging, transportation, electric apparatus, refrigeration, agriculture and forestry and gardening.

Description

technical field [0001] The invention relates to a preparation method of polylactic acid (PLA) foaming material, which adopts molded chemical foaming method to prepare PLA rigid foam with biodegradability, controllable density, high strength and excellent comprehensive performance through the control of formula and process conditions. bubble material. The invention belongs to the technical field of polymer processing. Background technique [0002] Polylactic acid is an aliphatic polyester polymer material with excellent biocompatibility and complete biodegradation. It can be completely decomposed under the action of microorganisms, water, acid, alkali, etc. in nature, and the final product is carbon dioxide. And water, no pollution to the environment, can be used as an environmentally friendly material to replace traditional polymer materials. Polylactic acid is not only biodegradable, but also its raw materials are derived from environmentally renewable resources, which ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/06C08L67/04C08K13/02B29B7/00B29B13/06B29C43/58
Inventor 张久礼戚嵘嵘
Owner SHANGHAI JIAO TONG UNIV
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