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Treatment method of wood fiber for wood plastic composite material

The technology of a wood-plastic composite material and a processing method, which is applied in the field of polymer processing, can solve the problems that wood fibers cannot be uniformly dispersed, and achieve the effect of cost advantage and low cost.

Inactive Publication Date: 2009-03-18
SHANGHAI BESTON PLASTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the difficult problem that the wood fiber cannot be uniformly dispersed in the wood-plastic composite material. The present invention discloses a wood fiber modification treatment method to solve the above problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 Wood-plastic product preparation

[0020] Use a mill to grind the wood fiber into a fine powder with a fineness of 60 meshes, and then dry it with an infrared dryer to control its moisture content below 2.0%;

[0021] Take 100 parts of the dried wood fiber powder and add it to the high-speed mixer and mix it to 90°C (rely on the friction between the material and the stirring paddle and the pot wall to heat up, the speed of high-speed stirring is: 1470r / min), and then add 6 parts of Industrial white oil and 8 parts of stearic acid are mixed until 120°C is completed.

[0022] Add 100 parts of waste plastics, 2 parts of maleic anhydride grafted high-density polyethylene, 8 parts of lubricant (calcium stearate: 4 parts, polyethylene wax: 4 parts), 0.1 part of anti-ultraviolet agent to the high-mixer. The system is evenly mixed.

[0023] Mixing and pre-plasticizing: Add the mixed materials to the mixing and extruding head of the flat double granulator, and the...

Embodiment 2

[0028] Example 2 Preparation of wood-plastic products

[0029] According to the methods specified in the various standards listed in the table below, the various item indicators of the wood-plastic products prepared in Example 1 are tested, and the results are shown in the table below. The physical and chemical indicators of the wood-plastic products prepared in Example 1 are obviously better than ordinary similar wood-plastic products .

[0030] Test items Wood-plastic product of the present invention Ordinary wood plastic products Testing Standard Tensile strength (Mpa) ≥10 ≥5 ASTM D638 Bending strength (Mpa) ≥12 ≥8 ASTM D790 Flexural modulus of elasticity (Mpa) ≥1600 ≥1000 ASTM D790 Compressive strength (Mpa) ≥30 ≥25 ASTM D143 Shore hardness (D) ≥60 ≥50 GB2411-80 Relative density (g / cm3) 0.8-1.2 0.9-1.4 ASTM D792 Water absorption (%) 1-3 2-4 ASTM D1037 Nail holding force (N) ≥3000 ≥2000 AS...

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PUM

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Abstract

The invention relates to the technical field of polymer processing, in particular to a method for modifying the surface of wood fiber. The method for modifying the wood fiber comprises the following steps: wood fiber is miniaturized, which is to grind the wood fiber into fine powder with fineness of between 60 and 80 meshes by a mill; the wood fiber powder is dried to ensure that the moisture content of the wood fiber powder is below 2.0 percent; 100 portions of dried wood fiber powder are added to a high-mix machine to be mixed to 90 DEG C at high speed, and 2 to 8 portions of technical white oil and 2 to 8 portions of stearic acid are then added to the wood fiber powder to be mixed to 120 DEG C. The wood fiber prepared by the modification method has good compatibility and dispersibility with thermoplastic materials, so that a wood-plastic product produced by using the wood fiber as raw material is superior to similar products in either presentation quality or physicochemical performance.

Description

technical field [0001] The invention relates to the technical field of polymer processing, in particular to a method for modifying the surface of wood fibers. Background technique [0002] Wood-plastic composite materials are made of plastic and wood fiber, which is an ideal wood substitute and an ideal new material to replace export wood packaging products. It is predicted that the demand for wood in my country in recent years is 100 million tons, while the supply is only 64 million tons, which is a big gap. As an alternative product, wood-plastic composite materials and their products have a wide sales market. The production principle of wood-plastic composite materials is to combine processed plastics with crushed wood powder (such as: plant fiber straw, fruit shell powder, sawdust, shavings, rice husk powder, etc.), stabilizers, coupling agents, Lubricants, colorants, etc. are melted and kneaded together to form granules or flakes, and then extruded and cooled by a sing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N1/00B27N3/04
Inventor 何小军
Owner SHANGHAI BESTON PLASTICS