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A method for preparing wood-plastic composite materials by subcritical water extrusion

A wood-plastic composite material and subcritical water technology, which is applied in the research field of reactive extrusion of polymer materials, can solve the problems of environmental pollution, low economic benefits, time-consuming and energy consumption, etc., and achieves low environmental pollution, low labor intensity, contact less pollution

Inactive Publication Date: 2017-10-24
NANJING TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although dilute acid pretreatment has solved some disadvantages of strong acid treatment, the follow-up process of acid treatment is not only time-consuming but also energy-intensive, with low economic benefits and serious environmental pollution.

Method used

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  • A method for preparing wood-plastic composite materials by subcritical water extrusion
  • A method for preparing wood-plastic composite materials by subcritical water extrusion
  • A method for preparing wood-plastic composite materials by subcritical water extrusion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1 (subcritical water extrusion): 80 mesh eucalyptus wood powder, produced by Shanghai Jiafeng Wood Powder Co., Ltd., 200g of the above wood powder and ABS (Zhenjiang Chimei Chemical Co., Ltd.) 300g are mixed; the mixture is added together In a co-rotating twin-screw extruder (Nanjing Coperion-Keya Machinery Equipment Co., Ltd.) with a diameter of 20mm and an aspect ratio of 32, the screw speed is controlled at 100r / min, and the extrusion temperature is 180°C. The blending reaction is carried out; at the same time, water is metered and injected at the screw structure diagram B, the pressure in the extruder is controlled by the metering pump and the reaction temperature, and it is 1.00 MPa at 180 ° C; The volatile gas generated during the reaction is removed; the extruded product is air-cooled and granulated to obtain an ABS-based wood-plastic composite material.

[0045] Put the above-mentioned extrusion blending and granulation product into an open mixer at 180°...

Embodiment 2

[0046] Example 2 (subcritical water extrusion): 200g of the above-mentioned wood powder, 275g of ABS (Zhenjiang Chimei Chemical Co., Ltd.) and 25g of maleic anhydride grafted ABS (MABS, Nanjing Qiangjian Plastic Co., Ltd.) were mixed, and the mixture And add in the above-mentioned twin-screw extruder, its screw speed, temperature, water injection speed and pressure condition are identical with embodiment 1.

Embodiment 3

[0047] Example 3 (subcritical water extrusion): 150g of the above-mentioned wood flour, ABS (Zhenjiang Chimei Chemical Co., Ltd.) 325g and maleic anhydride grafted ABS (MABS, Nanjing Qiangjian Plastic Co., Ltd.) 25g were mixed, and the mixture And add in the above-mentioned twin-screw extruder, its screw speed, temperature, water injection speed and pressure condition are identical with embodiment 1.

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Abstract

The invention relates to a method for subcritical water extrusion preparation of a wood-plastic composite material, and belongs to the high molecular material reactive extrusion research field. A thermoplastic high molecular material accounting for 40%-80% of the total mass of reactants, wood flour accounting for 60%-15% of the total mass of the reactants, and an interfacial reactive auxiliary agent accounting for 0%-10% of the total mass of the reactants are mixed, the mixture is subjected to a melt extrusion co-blending reaction in a double-screw extruder having a subcritical water extrusion reaction condition and a certain speed, the extrusion product is subjected to cooling, granulation and drying and then is subjected to open milling by an open mill and is subjected to tabletting, and thus the wood plastic composite material is prepared. The method is further improved based on a conventional double-screw extrusion co-blending method for preparation of a wood plastic composite material. The method further enhances a reaction between plastics and wood fiber surfaces, has the co-blending and reaction processes easy to control, and is high in yield, low in energy consumption, little in pollution, and easy to scale; and the prepared wood plastic composite material has excellent mechanical properties.

Description

technical field [0001] The invention belongs to the research field of reactive extrusion of polymer materials, and relates to a method for preparing wood-plastic composite materials by subcritical water extrusion; it is carried out on the basis of the original twin-screw extrusion blending method for preparing wood-plastic composite materials A further improvement is to carry out the melt blending extrusion reaction in a twin-screw extruder with subcritical water extrusion reaction conditions and a certain screw speed. technical background [0002] Wood is the only renewable material among the four major raw materials (wood, cement, steel, plastic) in the world, and it is also an ecological and environmentally friendly material. The society has more and more demand for wood products. However, wood resources mainly come from forest resources. With the development of modern society and economy, the society pays more and more attention to the ecological functions of forest reso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L55/02C08L97/02C08L51/00C08K3/18C08J3/00B29C47/92B29C48/92
Inventor 张玲李玉华曹明浪孔维荣张云灿
Owner NANJING TECH UNIV
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