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A method for preparing wood-plastic composites by subcritical alcohol extrusion

A wood-plastic composite material and subcritical technology, which is applied in the field of subcritical alcohol extrusion to prepare wood-plastic composite materials, can solve the problems of reducing the interface bonding force of wood-plastic composite materials, and achieve easy automation, low energy consumption, and continuous reaction process effect

Active Publication Date: 2018-07-17
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2014, Zhang Ling from Nanjing University of Technology and others (ZL20141126) proposed a method for preparing wood-plastic composite materials by extruding subcritical water, and subcritical water has strong oxidative properties, which can oxidatively degrade both wood powder and resin matrix, reducing the Interfacial adhesion of wood-plastic composites

Method used

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  • A method for preparing wood-plastic composites by subcritical alcohol extrusion
  • A method for preparing wood-plastic composites by subcritical alcohol extrusion
  • A method for preparing wood-plastic composites by subcritical alcohol extrusion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1: Select 80 mesh eucalyptus wood powder (Shanghai Yuncan Wood Products Co., Ltd.) 560g and PP-T30S (Shaanxi Yanchang (Group) Yan'an Petrochemical Plant) 200g, MAPP-50 (Nanjing Qiangren Plastic Co., Ltd.) 40g , liquid paraffin (Shanghai Lingfeng Chemical Reagent Co., Ltd., chemically pure) 16g, polyethylene wax (Shanghai Jinshan Xingxing Plastic Co., Ltd.) 8g, stearic acid 1801 (Malaysia Natural Oil Chemical Co., Ltd.) 8g, they are mixed with each other. The mixture was fed into a three-stage co-rotating twin-screw extruder with a diameter of 35mm and a length-to-diameter ratio of 44 (Nanjing Coperion-Keya Machinery Equipment Co., Ltd., the extrusion process and screw combination diagram of the extrusion device are shown in the attached figure 1 , attached figure 2 ), the screw speed is controlled at 120rpm, and the extrusion temperature is 170°C (water, 0.80MPa; n-propanol, 1.0MPa; ethanol, 1.60MPa), 180°C (water, 1.00MPa; n-propanol, 1.2MPa; ethanol , 2.0...

Embodiment 2

[0069] Embodiment two: choose 480g of 80 mesh eucalyptus wood flour (Shanghai Yuncan Wood Products Co., Ltd.), 240g of PP-T30S, 80g of MAPP-50, polyethylene wax is 8g, and stearic acid is 8g, and they are mutually Mixing, the mixture is added together in the above-mentioned twin-screw extruder, and its screw speed is 120rpm, temperature is 190 ℃, injects ethanol (2.4MPa) at B metering position of screw structure diagram simultaneously, other conditions are identical with embodiment one.

Embodiment 3

[0073] Embodiment three: choose the 80 order eucalyptus wood flour of 560g (Shanghai Yuncan Wood Products Co., Ltd.), the PP-T30S of 160g, the MAPP-50 of 80g, polyethylene wax is 8g, and stearic acid is 8g, and they are mutually Mixing, the mixture is added together in the above-mentioned twin-screw extruder, and its screw speed is 120rpm, temperature is 190 ℃, injects ethanol (2.4MPa) at B metering position of screw structure diagram simultaneously, other conditions are identical with embodiment one.

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Abstract

The invention relates to a method for preparing wood-plastic composite by subcritical alcohol extrusion and belongs to the field of study on reaction techniques of polymer materials. The method comprises: mixing, in percent accounting for total weight of reaction materials, 20-80% of a thermoplastic polymer material, 20-80% of wood flour and 0-20% of an interface reaction acid, and melting, extruding and blend-reacting a mixture in a twin-screw extruder with subcritical alcohol extrusion reaction conditions and suitable screw speed; cooling, slivering and granulating an extrusion product, mixing with an open mill, and sheeting with a flat-plate vulcanizer to obtain the wood-plastic composite. The reaction of the thermoplastic polymer material with wood fiber surface is improved, an extrusion reaction process is easy to control, nontoxic, high in yield, low in energy consumption, easy to enlarge and scale and low in environmental pollution, and the wood-plastic composite with excellent mechanical properties can be obtained.

Description

Technical field: [0001] The invention relates to a method for preparing wood-plastic composite materials through subcritical alcohol extrusion, which belongs to the research fields of extrusion reaction engineering and mechanochemical reaction of polymer materials. technical background: [0002] In 1983, the United States produced the first batch of wood-plastic composites (Wood Plastic Composites, WPCs). In recent years, with the decrease of forest area and the decrease of petroleum-based resources, the awareness of social environmental protection has been increasing. Wood-plastic composite material is a kind of plant fiber or powder and thermoplastic polymer as the main raw material, adding appropriate additives. It is a green and environmentally friendly composite material with high performance and high added value that is similar to wood properties through extrusion, injection molding or compression molding. It has been listed as green energy-saving and environmental pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L97/02C08L27/06C08L23/12C08L23/06C08L25/12C08L55/02C08J9/14
CPCC08J9/142C08J2355/02C08J2397/02C08J2451/06C08L55/02C08L97/02C08L2205/025C08L2205/03C08L2205/035C08L2205/08C08L2205/16C08L2207/062C08L23/12C08L51/06C08K5/09C08K5/10C08K5/544C08L23/06C08L91/06
Inventor 张玲曹金星曹明浪张云灿
Owner NANJING TECH UNIV
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