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Raw material treatment method for injection molding grade micro-foaming wood-plastic composite material

A technology of wood-plastic composite materials and processing methods, which is applied in the field of raw material processing, can solve problems such as poor surface finish, inability to be injected, and high brittleness, and achieve high flexural modulus, good uniformity, and low molding shrinkage.

Inactive Publication Date: 2013-11-20
江西省大余章源竹木制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] What the present invention is to solve is how to reduce or eliminate the moisture in the bamboo wood powder, improve the dispersibility of the micro-foaming nucleating agent in the matrix, so that it can be used in the production of injection molding wood-plastic composite materials, and improve the existing wood-plastic composite materials. The material has problems such as poor surface finish, low strength, high brittleness, and inability to be injected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Grinding ingredients: crush bamboo and wood waste into 40-200 mesh, then sieve it into 40-60 mesh, 60-80 mesh, 80-140 mesh and 140-200 mesh different components, according to (40-60 mesh ): (60-80mesh): (80-140mesh): (140-200mesh) = 30: 40: 15: 15 ratio with bamboo and wood powder, while controlling the bulk density of bamboo and wood powder at 0.45g / cm 3 .

[0033] 2. Modification treatment: the pulverized and batched bamboo wood powder is heat-treated by microwave drying under the protection of nitrogen. The heat-treatment temperature is 200° C. and the time is 10 hours.

[0034] 3. Mix 40 parts of modified bamboo and wood powder with 5 parts of adsorbent nano-calcium oxide at high speed (2500 rpm) for 12 minutes. Then add other materials according to the following metering: 50 parts of plastic, 2 parts of coupling agent, 3 parts of foaming agent, 1 part of foaming aid, 1.5 parts of pigment, 3 parts of compatibilizer, 2 parts of lubricant, 3 parts of plasticizer ...

Embodiment 2

[0038]1. Grinding ingredients: crush bamboo and wood waste into 40-200 mesh, then sieve it into 40-60 mesh, 60-80 mesh, 80-140 mesh and 140-200 mesh different components, according to (40-60 mesh ): (60-80 mesh): (80-140 mesh): (140-200 mesh) = 35: 30: 20: 15 The proportion of bamboo and wood powder is matched well, and the bulk density of bamboo and wood powder is controlled at 0.4g / cm 3 .

[0039] 2. Modification treatment: the crushed and prepared bamboo wood powder is heat-treated by microwave drying under the protection of nitrogen. The heat treatment temperature is 220° C. and the time is 8 hours.

[0040] 3. Mix 45 parts of modified bamboo and wood powder with 6 parts of adsorbent nano-calcium oxide at high speed (2600 rpm) for 10 minutes. Then add other materials according to the following metering: 55 parts of plastic, 3 parts of coupling agent, 4 parts of foaming agent, 1.5 parts of foaming aid, 1.8 parts of pigment, 3.5 parts of compatibilizer, 2.5 parts of lubrica...

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Abstract

The invention relates to a raw material treatment method for an injection molding grade micro-foaming wood-plastic composite material, which comprises the following steps: pulverizing bamboo and wood waste into 40-200 meshes, then screening to obtain powder having different finenesses, and blending the coarse and fine powder with bamboo and wood powder according to a certain ratio; under a nitrogen gas protective atmosphere, performing heat treatment on the blended bamboo and wood powder at 160-280 DEG C for 0.5-12 hours; under the condition of stirring at a high speed of 300-2800r / min, uniformly mixing the modified bamboo and wood powder with adsorbent, plastic, coupling agent, foaming agent, foaming promoter, pigment, compatilizer, lubricant, plasticizer and enhanced filler to prepare a mixture; and extruding and granulating the mixture through an extruder, thus obtaining the injection molding grade micro-foaming wood-plastic composite material. The wood-plastic composite material has the characteristics of high surface gloss, high strength and toughness, low cost and the like, and is suitable for various injection molding products of which the molding shape is relatively complex.

Description

technical field [0001] The invention relates to a preparation method of a wood-plastic composite material, in particular to a processing method for raw materials used in injection molding grade micro-foamed wood-plastic composite materials. Background technique [0002] The emergence of wood-plastic composite materials makes full use of bamboo and wood waste and waste plastics, which can not only effectively improve the utilization rate of bamboo and wood, alleviate the contradiction between the lack of forest resources in my country and the shortage of bamboo and wood supply, but also reduce the waste caused by the use of plastic belts. coming environmental pollution. However, there are still some problems to be solved in wood-plastic composite materials, such as poor interfacial compatibility between bamboo wood powder and plastics, resulting in low surface hardness, poor toughness, low strength, poor fluidity, easy cracking and deformation, poor dimensional stability, Dis...

Claims

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Application Information

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IPC IPC(8): C08L97/02C08L23/06C08L23/12C08L25/06C08L27/06C08L67/02C08L55/02C08K13/02C08K3/22C08K5/54C08K5/10C08K3/26C08K3/34C08J9/06
Inventor 唐友玮唐英斌韩磊张志伟邹海平龚巧英
Owner 江西省大余章源竹木制品有限公司
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