Supercritical CO2 micro-foaming polylactic acid/wood-flour composite material and preparation method thereof

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 the problems of wood-plastic foamed material wastes not easy to degrade, environmental hazards, etc., and achieve high cell density and less time-consuming , The effect of simple foaming process

Inactive Publication Date: 2013-02-20
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, wood-plastic foam material waste is not easy to degrade, and there are potential environmental hazards

Method used

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  • Supercritical CO2 micro-foaming polylactic acid/wood-flour composite material and preparation method thereof
  • Supercritical CO2 micro-foaming polylactic acid/wood-flour composite material and preparation method thereof
  • Supercritical CO2 micro-foaming polylactic acid/wood-flour composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The raw material components are:

[0018] 41 parts of L-polylactic acid (PLLA, melt index <2g / 10min).

[0019] 16 parts of eucalyptus powder (80 orders).

[0020] 8.2 parts of polyethylene glycol (PEG-400, analytically pure).

[0021] 0.8 parts of coupling agent (γ-methacryloxypropyltrimethoxysilane (KH570, analytically pure)).

[0022] 33 parts of absolute ethanol (analytical pure).

[0023] Glacial acetic acid (analytical pure) ≤ 0.1 parts.

[0024] Simethicone oil (analytical pure) 0.8 parts.

[0025] 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,...

Embodiment 2

[0029] The raw material components are:

[0030] 41 parts of L-polylactic acid (PLLA, melt index <2g / 10min).

[0031] 16 parts of eucalyptus powder (80 orders).

[0032] 8.2 parts of polyethylene glycol (PEG-400, analytically pure).

[0033] 0.8 parts of γ-methacryloxypropyltrimethoxysilane (KH570, analytically pure).

[0034] 32.5 parts of absolute ethanol (analytical pure).

[0035] Glacial acetic acid (analytical pure) ≤ 0.1 parts.

[0036] Simethicone oil (analytical pure) 0.8 parts.

[0037] 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

[0042] The raw material components are:

[0043] 41 parts of L-polylactic acid (PLLA, melt index <2g / 10min).

[0044] 16 parts of eucalyptus powder (80 orders).

[0045] 8.2 parts of polyethylene glycol (PEG-400, analytically pure).

[0046] 0.8 parts of γ-methacryloxypropyltrimethoxysilane (KH570, analytically pure).

[0047] 32.5 parts of absolute ethanol (analytical pure).

[0048] Glacial acetic acid (analytical pure) ≤ 0.1 parts.

[0049] Simethicone oil (analytical pure) 0.8 parts.

[0050] 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...

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Abstract

The invention provides a supercritical CO2 micro-foaming polylactic acid/wood-flour composite material and a preparation method of the supercritical CO2 micro-foaming polylactic acid/wood-flour composite material, and relates to a micro-foaming composite material and a preparation method of the micro-foaming composite material, solving the problems of common wood-plastic composite material that the density is high, the impact strength is low, and the resulting waste is easy to pollute the environment. The preparation method comprises the following steps: getting raw materials such as polylactic acid, wood flour, a coupling agent, a toughening agent and a lubricant; mixing the raw materials in a high-speed mixer based on a certain ratio; melting and blending by a two-roll mill; preparing a sample by compression molding; then swelling the sample by adopting the supercritical carbon dioxide as the foaming agent; and finally quickly releasing the pressure, thus obtaining the micro-foaming polylactic acid/wood-flour composite material. The supercritical CO2 micro-foaming polylactic acid/wood-flour composite material has the advantages that the temperature for foaming is low, the pressure is held within a short time, a cellular structure is easy to control, and the prepared micropore composite material is small in aperture and high in cellular density; and the supercritical CO2 micro-foaming polylactic acid/wood-flour composite material is a green and environment-friendly foaming material with good 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] Existing wood-plastic composite materials are mainly prepared by resins such as PE, PP and PVC. In order to overcome the shortcomings of high density, wood-plastic foam materials can be prepared, such as Chinese patents CN1948384A, CN101200971A, CN101962455A, CN102229728A, CN102146187A, CN102250476A, CN102167872A, etc. relate to the foaming technology and method of wood-plastic composite materials. Foaming methods can be divided into chemical foaming and physical foaming. Among them, the chemical foaming process is more complicated, and the cost of the foam material produced is relatively high. However, the physical foaming process is simple, such as supercritical CO 2 As a special physical blowing agent, it is cheap, non-toxic, non-flammable, and environmentally friendly, and it is better than normal temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L97/02C08J9/12
Inventor 宋丽贤卢忠远姚妮娜张平康明宋开平
Owner SOUTHWEAT UNIV OF SCI & TECH
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