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Supercritical CO2 micro foamed polylactic acid/wooden powder composite material

A technology of composite materials and polylactic acid, which is applied in the field of wood-plastic micro-foamed composite materials and their processing and molding, can solve problems such as environmental hazards and wastes that are not easy to degrade, and achieve less time consumption, high cell density, and uniform cell size Effect

Inactive Publication Date: 2018-03-06
HEILONGJIANG XINDA ENTERPRISE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, wood-plastic foam material waste is not easy to degrade, and there are potential environmental hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The raw material components are:

[0022] 38 parts of L-polylactic acid (PLLA, melt index <2g / 10min).

[0023] 18 parts of eucalyptus powder (80 orders).

[0024] 8.7 parts of polyethylene glycol (PEG-400, analytically pure).

[0025] 0.7 parts of coupling agent (y-methacryloxypropyltrimethoxysilane (KH570, analytically pure)).

[0026] 33.6 parts of absolute ethanol (analytical pure).

[0027] Glacial acetic acid (analytical pure) ≤ 0.1 parts.

[0028] Simethicone oil (analytical pure) 0.9 parts.

[0029] Add the wood flour and coupling agent solution into a high-speed mixer to mix and modify, the mixing time is 8min; Mixture; the melt blending temperature is 170°C; the kneading time is 20min; the obtained pre-mixture is molded in a flat vulcanizer to obtain a molded sample; the temperature of the molded molding is 170°C; the pressure is 10MPa; the holding time for 8min; the resulting molded sample was placed in supercritical CO 2 Swell in the foaming kettle bod...

Embodiment 2

[0033] The raw material components are:

[0034] 41 parts of L-polylactic acid (PLLA, melt index <2g / 10min).

[0035] 18 parts of eucalyptus powder (80 orders).

[0036] 8.7 parts of polyethylene glycol (PEG-400, analytically pure).

[0037] 0.7 parts of γ-methacryloxypropyltrimethoxysilane (KH570, analytically pure).

[0038] 33.6 parts of absolute ethanol (analytical pure).

[0039] Glacial acetic acid (analytical pure) ≤ 0.1 parts.

[0040] Simethicone oil (analytical pure) 0.9 parts.

[0041] Add the wood flour and coupling agent solution into a high-speed mixer to mix and modify, the mixing time is 8min; Mixture; the melt blending temperature is 170°C; the kneading time is 20min; the obtained pre-mixture is molded in a flat vulcanizer to obtain a molded sample; the temperature of the molded molding is 170°C; the pressure is 10MPa; the holding time for 8min; the resulting molded sample was placed in supercritical CO 2 Swell in the foaming kettle body, control the sw...

Embodiment 3

[0046] The raw material components are:

[0047] 38 parts of L-polylactic acid (PLLA, melt index <2g / 10min).

[0048] 18 parts of eucalyptus powder (80 orders).

[0049] 8.7 parts of polyethylene glycol (PEG-400, analytically pure).

[0050] 0.7 parts of γ-methacryloyloxycycyltrimethoxysilane (KH570, analytically pure).

[0051] 33.6 parts of absolute ethanol (analytical pure).

[0052] Glacial acetic acid (analytical pure) ≤ 0.1 parts.

[0053] Simethicone oil (analytical pure) 0.9 parts.

[0054] Add the wood flour and coupling agent solution into a high-speed mixer for mixing and modification, the mixing time is 8 minutes; the temperature is 50°C; then the modified wood flour and polylactic acid are mixed, and melted and blended by a double-roll mill to obtain a pre- Mixture; the melt blending temperature is 170°C; the mixing time is 20min; the obtained pre-mixture is molded in a flat vulcanizer to obtain a molded sample; the temperature of the molded molding is 170°C;...

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Abstract

The invention discloses a supercritical carbon dioxide micro foamed polylactic acid / wooden powder composite material and a preparation method thereof. The invention relates to a micro foamed compositematerial and a preparation method thereof. In view of the problems of large density and low impact strength of normal wood plastic composite materials, and the environmental problems easily caused byrejected materials thereof and the like, polylactic acid, wooden powder, coupling agent, toughening agent and lubricant are adopted as raw materials of the supercritical carbon dioxide micro foamed polylactic acid / wooden powder composite material. The raw materials are mixed in a high speed mixer according to a certain proportion, melting blending is conducted through a double-roller open mill, compression moulding is conducted to prepare samples, then supercritical carbon dioxide is used as a foaming agent to swell the samples, and finally micro porous polylactic acid / wooden powder compositematerials are acquired by conducting rapid pressure releasing. The material has the advantages that the foaming temperature is low, the holding pressure time is short, the pore structure is easy to control, and the prepared micro porous composite material is small in pore diameter and large in pore density and will be a green environmentally friendly foamed material with excellent performance.

Description

technical field [0001] The invention relates to a wood-plastic micro-foaming composite material and a processing and molding method thereof. Background technique [0002] Polylactic acid (PLA) is converted from starch extracted from renewable plant resources such as corn and potatoes into glucose, and the glucose is fermented into polylactic acid. PLA has good biocompatibility and high strength, and can be completely biodegraded. The final products after degradation are water and carbon dioxide. Therefore, it is non-toxic and will not cause environmental pollution. The traditional polylactic acid modification method combines polylactic acid with other high polymers or adds inorganic fillers. It is difficult to improve the resistance of polylactic acid at the same time without specific requirements for processing technology. Impact resistance, heat resistance and mechanical properties, etc. Although PLA has excellent comprehensive properties and high strength, its toughness ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L67/04C08L97/02C08K5/5425
CPCC08J9/122C08J2203/06C08J2203/08C08J2367/04C08J2497/02C08L67/04C08L2203/14C08L2205/035C08L2205/16C08L97/02C08K5/5425
Inventor 王文强崔成杰谢众
Owner HEILONGJIANG XINDA ENTERPRISE GRP
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