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A kind of preparation method of pet wood-plastic composite material

A technology of wood-plastic composite materials and mixed materials, which is applied in the preparation of wood-plastic composite materials and PET wood-plastic composite materials, and can solve the problems of limiting the production and application of PET wood-plastic composite materials and high melting temperature

Active Publication Date: 2021-08-20
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the melting temperature of PET is as high as 250°C, the production and application of PET wood-plastic composite materials are limited.

Method used

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  • A kind of preparation method of pet wood-plastic composite material
  • A kind of preparation method of pet wood-plastic composite material
  • A kind of preparation method of pet wood-plastic composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The modified wood powder is prepared by the following method: take straw powder with a particle size of 170 μm to 190 μm, heat treatment at 100 ° C and dry, then extract with acetone, and dry for later use; add water to dilute the thermosetting phenolic resin, add the above-mentioned wood powder, and the weight of the wood powder It is 0.8 times the weight of the thermosetting phenolic resin, ultrasonicated at room temperature for 30 minutes in an ultrasonic cleaner, and then centrifugally filtered, the centrifugal speed is 1200 r / min, the centrifugation time is 5 minutes, and the filtrate after centrifugation is heat-treated at 128 ° C for 45 minutes to obtain modified wood. pink. Take three parts of the obtained modified wood powder, in a high-purity nitrogen atmosphere of 100 mL / min, heat up to 250 ° C, 350 ° C, and 600 ° C, respectively, and keep the temperature for 30 minutes for pyrolysis. , 64.1%.

Embodiment 2

[0040] The modified wood powder was prepared by the following method: take poplar wood powder with a particle size of 170 μm to 190 μm, heat treatment at 105 ° C and dry, then extract with acetone, and dry for later use; add water to dilute the thermosetting phenolic resin, add the above-mentioned wood powder, wood powder The weight is 0.8 times the weight of the thermosetting phenolic resin. Ultrasonic for 30min at room temperature in an ultrasonic cleaner, then centrifugal filtration, centrifugal speed 1200r / min, centrifugation time 5min, the filtrate after centrifugation is modified by heat treatment at 128°C for 45min Wood flour. Take three parts of the obtained modified wood powder, in a high-purity nitrogen atmosphere of 100 mL / min, heat up to 250 ° C, 350 ° C, 600 ° C, respectively, and keep the temperature for 30 minutes for pyrolysis, and detect the residual carbon rate, which are 87.5% and 76.1%, respectively. , 63.5%.

Embodiment 3

[0042] The PET wood-plastic composite material of the present invention is prepared by the following method: the PET resin is dried at 125° C. for 4 hours to form a foamed raw material, and the obtained foamed raw material is uniformly mixed with a nucleating agent to obtain a mixture for use; Example 1 The obtained modified wood powder, coupling agent and sodium carboxymethyl cellulose were treated in a high-speed mixer for 35 minutes, and mixed with the aforementioned mixture at 73 ° C to obtain a mixed material, and then a foaming agent and a plasticizer were added, and the mixture was uniformly mixed. , kneading in a two-roll mill, the kneading temperature is 248 ℃, the kneaded material is cooled down to obtain a composite material sheet, and then mixed with the PET foam sheet at a temperature of 250 ℃ and a pressure of 9 MPa. Hot press molding, in which the PET foam sheet is in the middle layer, and the material of the composite material is in the upper and lower layers. ...

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Abstract

The invention provides a preparation method of PET wood-plastic composite material. In order to reduce the cost and improve the performance of the wood-plastic composite material, the present invention provides a method for preparing a PET wood-plastic composite material, the method comprising the following steps: S1, drying the PET resin to form a foaming raw material; S2, Uniformly mixing the foaming raw material obtained in step S1 with a nucleating agent to obtain a mixture; S3, processing the modified wood flour, a coupling agent, and sodium carboxymethyl cellulose in a high-speed mixer; S4, combining the obtained step S3 with the step S2 The obtained mixture is uniformly mixed, then foaming agent and plasticizer are added, mixed uniformly, extruded, pressed or injected. The PET wood-plastic composite material prepared by the method of the invention has low cost, good mechanical properties, long service life, light weight, good cushioning performance, easy processing and modification, and strong designability.

Description

technical field [0001] The invention belongs to the field of composite materials and relates to a preparation method of a wood-plastic composite material, in particular to a preparation method of a PET wood-plastic composite material. Background technique [0002] The preparation of wood-plastic materials from thermoplastics and wood fibers, bamboo fibers or crop fibers can make full use of recycled plastics and agricultural and forestry wastes, and has good ecological benefits and good economic benefits. The waste wood-plastic composite materials can also be re-produced by crushing, forming a recycling utilization mode, which meets the requirements of developing a circular economy and building a conservation-oriented society. At present, most of the wood-plastic composite materials are made by composite processing of log wood powder or wood fiber and plastic. Existing wood-plastic composite materials have relatively high thermal conductivity, and are not suitable for use a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08L97/02C08J9/10C08J9/08C08H8/00
CPCC08H8/00C08J9/08C08J9/103C08J2203/02C08J2203/04C08J2367/02C08J2497/02
Inventor 欧荣贤王清文易欣孙理超谭伟吴江伟
Owner SOUTH CHINA AGRI UNIV
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