High-strength wood-plastic composite with swelling resistance, moisture resistance and ageing resistance and preparation method of wood-plastic composite

A wood-plastic composite material, high-strength technology, applied in the field of wood-plastic composite material and its preparation

Inactive Publication Date: 2015-03-11
KUNMING IRON & STEEL HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to a certain amount of free hydroxyl groups, the wood-plastic composite material has a certain degree of hygroscopicity. After moisture absorption, the mechanical strength of the wood-plastic composite material drops sharply, the frost resistance performance deteriorates, the mildew resistance and antibacterial performance deteriorate, and even water absorption warping and cracking may occur. And other issues
On the other hand, because it contains a certain amount of water and is weakly acidic, the wood-plastic composite material is easy to decompose after being heated, releasing a large amount of acid gas, causing chemical corrosion to the equipment screw, and carbonization and zooming if the temperature is too high
In addition, due to the low heat transfer coefficient of WPC itself, it is difficult to cool after molding, and the parison is easily deformed after a long time after it comes out of the extruder.
The above-mentioned factors are the bottleneck problems that cause low production efficiency, low yield rate, unstable product quality, high production cost and difficulty in large-scale promotion and application of wood-plastic composite materials.

Method used

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  • High-strength wood-plastic composite with swelling resistance, moisture resistance and ageing resistance and preparation method of wood-plastic composite

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preparation example Construction

[0039] The preparation method of the wood-plastic composite material of the present invention includes masticating, extruding and cooling processes, specifically including:

[0040] The plasticating refers to adding all the raw materials weighed according to the formula ratio into the internal mixer, stirring and blending at a high speed at 100-240°C for 12-20 minutes to obtain pre-plasticized materials;

[0041] The extrusion refers to sending the pre-plasticized material to a single-screw or twin-screw extruder through a double-wrist or double-cone feeder, and directly extruding the pre-plasticized material at 130~190°C The good materials are sent to the granulator for granulation, and then the prepared pellets are sent to the extruder for molding;

[0042] Said cooling refers to cooling the formed parison until it is finalized.

[0043] The preparation method of the present invention may also include a cutting process, which is to cut the shaped parison according to the re...

Embodiment 1

[0051] - Preparation of wood-plastic composite materials

[0052] (1) Raw material composition:

[0053] 15 parts of PE resin powder after sorting, cleaning and drying to a moisture content of 2~5%

[0054] Chlorinated polyethylene 10 parts

[0055] 50 parts of wood powder with a particle size of 180~250μm and a moisture content of ≤10%

[0056] 5~15 parts of wollastonite powder with a particle size of 18~23μm and a moisture content of ≤1%

[0057] 5 parts of calcium oxide with a particle size of 5~45μm

[0058] Aluminate coupling agent (UP802) 2 parts

[0059] No. 56 paraffin wax 3 parts

[0060] (2) Preparation method:

[0061] Put all the raw materials weighed according to the proportion of the formula into the 110-type internal mixer. The working temperature of the internal mixer is controlled at 150~200°C, and the speed of the double-edged rotor is 20~40r / min. Automatic heating with strong shearing force, high-speed stirring and blending for 12 minutes, to obtain pre...

Embodiment 2

[0065] - Preparation of wood-plastic composite materials

[0066] (1) Raw material composition:

[0067] 20 parts of PP resin powder after sorting, cleaning and drying to a moisture content of 2~5%

[0068] Chlorinated polyethylene 9 parts

[0069] 60 parts of bamboo powder with a particle size of 180~250μm and a moisture content of ≤10%

[0070] 5 parts of wollastonite powder with a particle size of 18~23μm and a moisture content of ≤1%

[0071] 1 part of calcium oxide with a particle size of 5~45μm

[0072] Silane coupling agent (KH570) 2 parts

[0073] 3 parts of PP wax

[0074] (2) Preparation method:

[0075] Put all the raw materials weighed according to the proportion of the formula into the 110-type internal mixer. The working temperature of the internal mixer is controlled at 100~170°C, and the speed of the double-edged rotor is 20~40r / min. Automatic heating with strong shearing force, high-speed stirring and blending for 20 minutes, to obtain pre-plasticized a...

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Abstract

The invention discloses high-strength wood-plastic composite with swelling resistance, moisture resistance and ageing resistance and a preparation method of the wood-plastic composite. The wood-plastic composite comprises raw materials in parts by weight as follows: 15-20 parts of secondary recycled resin, 8-10 parts of chlorinated polyethylene, 50-60 parts of plant fiber, 5-15 parts of inorganic powder, 1-5 parts of a desiccant and 1-5 parts of an auxiliary. The preparation method comprises a plastication process, an extrusion process and a cooling process, firstly, the raw materials weighed in the formula ratio are added to an internal mixer and subjected to plastication for 12-20 min at the temperature of 100-240 DEG C; then the materials well subjected to are fed to a single-screw or twin-screw extruder by a double-wrist or double-cone feeder and subjected to direct extrusion molding at 130-190 DEG C, or the materials well subjected to preplastification are fed to a pelletizer to produce pellets and then conveyed to an extruder for molding; and finally, molded parison is cooled to setting. With adoption of the preparation method, decomposition and carbonization of the raw materials in the plastication process can be inhibited effectively, the hygroscopicity of the raw materials is reduced, equipment corrosion is reduced, and the dimensional stability, the ageing resistance and the strength of the wood-plastic composite are improved.

Description

technical field [0001] The invention belongs to the technical field of wood-based composite materials, and in particular relates to a wood-plastic composite material with anti-expansion and moisture resistance, high strength and aging resistance and a preparation method thereof. Background technique [0002] Wood-plastic composite (WPC for short) is a new type of material made of plant fiber as the main raw material and compounded with plastic. It is a new type of composite material that has been booming at home and abroad in recent years. It mainly uses waste plastics and plant fibers such as branches, tree branches, rice husks, and crop straws as raw materials. The products made are widely used in packaging, gardening, transportation, construction, Home decoration, car and ship interior decoration and other places. It combines the dual advantages of "wood" and "plastic", and has many advantages such as environmental protection, waterproof, corrosion resistance, insect res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L97/02C08L23/28C08L27/06C08L23/06C08L23/12C08K13/02C08K3/26C08K3/34C08K3/30C08K3/22C08K3/36B29B9/06B29C47/92B29C48/92
Inventor 刘瑞铭赵华玲
Owner KUNMING IRON & STEEL HLDG CO LTD
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