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Layer-by-layer self-assembly weather-proof wood-plastic composite material of core-shell structure and preparation method thereof

A wood-plastic composite material, layer-by-layer self-assembly technology, applied in the field of comprehensive utilization of agricultural and forestry by-products, can solve problems such as high cost, large consumption, environmental pollution, etc., achieve good weather resistance, and reduce negative effects.

Inactive Publication Date: 2018-07-13
MINNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to solve the current weather resistance problem of easy aging in the application process of wood-plastic composite materials, and the traditional light stabilizers also expose various defects, such as organic light stabilizers cannot resist aging for a long time, have a certain environmental Pollution and other issues, the inorganic nano-weathering agent is mixed into the composite material by blending, resulting in a large amount and high cost, TiO 2 and the low light absorption efficiency of nanotube-based light absorbers, providing a layer-by-layer self-assembled weather-resistant wood-plastic composite material with a core-shell structure and a preparation method thereof

Method used

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preparation example Construction

[0039] A method for preparing a layer-by-layer self-assembled weather-resistant wood-plastic composite material with a core-shell structure, comprising the following steps:

[0040] 1) Pass 20-30 parts of wood powder through a 100-150 mesh sieve, dry at 90-110°C for 18-24h, then add a titanate coupling agent with 2-4% weight of wood powder, and stir at 80-90°C React for 3-5 hours, then cool to room temperature to obtain modified wood flour;

[0041] 2) Combine the modified wood powder obtained in step 1), 60-100 parts of polypropylene, 2-5 parts of dioctyl phthalate, 8-12 parts of ethylene-vinyl acetate copolymer, 1-3 parts of azo Diformamide, 2-8 parts of talcum powder and 1-3 parts of zinc stearate are mixed, and stirred at 130-160° C. for 10-20 minutes to obtain a mixed material;

[0042] 3) Extrude the above mixed material in a twin-screw extruder, and the heating temperature T1-T10 of each section is 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 170°C, 160°C, 140 ℃ and 120 ...

Embodiment 1

[0049] A method for preparing a layer-by-layer self-assembled weather-resistant wood-plastic composite material with a core-shell structure, comprising the following steps:

[0050] 1) Pass 20 parts of wood powder through a 100-mesh sieve, dry at 90°C for 24 hours, then add a titanate coupling agent of 2% by weight of wood powder, stir and react at 80°C for 5 hours, and then cool to room temperature to obtain modified wood pink;

[0051] 2) Mix the modified wood powder obtained in step 1), 60 parts of polypropylene, 2 parts of dioctyl phthalate, 8 parts of ethylene-vinyl acetate copolymer, 1 part of azodicarbonamide, and 2 parts of talcum powder After mixing with 1 part of zinc stearate, stir at 130°C for 20 minutes to obtain a mixed material;

[0052] 3) Extrude the above mixed material in a twin-screw extruder, and the heating temperature T1-T10 of each section is 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 170°C, 160°C, 140 ℃ and 120 ℃, the speed of the main machine is 10 r...

Embodiment 2

[0059] A method for preparing a layer-by-layer self-assembled weather-resistant wood-plastic composite material with a core-shell structure, comprising the following steps:

[0060] 1) Pass 30 parts of wood powder through a 150-mesh sieve, dry at 110°C for 24 hours, then add a titanate coupling agent of 4% by weight of wood powder, stir and react at 90°C for 3 hours, and then cool to room temperature to obtain modified wood pink;

[0061] 2) Mix the modified wood powder obtained in step 1), 100 parts of polypropylene, 5 parts of dioctyl phthalate, 12 parts of ethylene-vinyl acetate copolymer, 3 parts of azodicarbonamide, and 8 parts of talcum powder After mixing with 3 parts of zinc stearate, stir at 160° C. for 10 minutes to obtain a mixed material;

[0062] 3) Extrude the above mixed material in a twin-screw extruder, and the heating temperature T1-T10 of each section is 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 170°C, 160°C, 140 ℃ and 120 ℃, the speed of the host machine ...

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Abstract

The invention discloses a layer-by-layer self-assembly weather-proof wood-plastic composite material of a core-shell structure and a preparation method thereof. The preparation method comprises the following steps: taking wood flour and polypropylene as main raw materials, preparing a wood-plastic composite material through twin-screw extrusion molding, preparing a rare earth element doped H2Ti2O5.H2O nanometer tube through a hydrothermal synthesis method, and using the rare earth element doped H2Ti2O5.H2O nanometer tube as a core to form a core-shell structure in an SiO2 nanoparticle claddingmanner. Under the protection of a 'housing', negative effects generated by photocatalysis are eliminated or reduced while the adsorption shielding effect of the H2Ti2O5.H2O nanometer tube for light is maintained, and finally the surface of the wood fiber matrix composite material is coated with a nanometer membrane in a layer-by-layer self-assembly, so that the weather resistance is obtained.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of agricultural and forestry by-products, and specifically relates to a layer-by-layer self-assembled weather-resistant wood-plastic composite material with a core-shell structure applied to the field of outdoor building decoration materials and a preparation method thereof. Background technique [0002] Since the 1990s, wood-plastic composites have ushered in an era of explosive growth. In the past 20 years, the world wood-plastic composites market has developed rapidly at a double-digit annual growth rate. At the end of 2016, the global wood The demand for plastic composite materials exceeds 3 million tons, and its total value can reach about 6 billion US dollars. [0003] Wood-plastic composite material is a kind of composite material processed by mixing plastic with low-value biomass fibers such as wood flour, wood chips, chaff, crop straw, and bagasse. It combines the advan...

Claims

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Application Information

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IPC IPC(8): C08J7/04C01G23/00
CPCC01G23/00C08J7/0423C08J2323/12C08J2397/02C08J2425/06
Inventor 费鹏黄阿真陈晨昕白榕刘胜汤林枭蔡杰
Owner MINNAN NORMAL UNIV
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