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Method for processing modified plant fibers of polyolefine wood-plastic composite

A wood-plastic composite material and plant fiber technology, which is applied to the processing field of modified plant fibers used for polyolefin wood-plastic composite materials, can solve the problem that the curing time reduces production efficiency, the wood powder modification is incomplete, and the wood powder is easy to mold. and other problems, to achieve the effect of improving the curing time and curing efficiency, the appearance of simulated wood, and the high content of plant fiber powder.

Inactive Publication Date: 2011-04-20
HANGZHOU NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water absorption rate of these wood-plastic composite materials must be very low. If the water absorption rate is too high, a series of problems will occur in the outdoor environment: after absorbing water, the resistance to fungal decay will be reduced, and the wood powder in the material is easy to mold and rot, and is resistant to freezing. The melting stability becomes worse, the mechanical strength decreases significantly after absorbing water, etc.
[0008] In the invention patent of "a polyolefin wood-plastic composite material with low water absorption rate", the dry oil is used to modify the plant fiber, because the dry oil cures at room temperature for a long time or even as long as half a month and the curing is not complete , resulting in incomplete modification of wood flour, and too long curing time seriously reduces production efficiency

Method used

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  • Method for processing modified plant fibers of polyolefine wood-plastic composite
  • Method for processing modified plant fibers of polyolefine wood-plastic composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] 1. Preparation of dry oil

[0066] The formula for handling dry oil quality is as follows:

[0067] 100 parts linseed oil

[0068] Cobalt naphthenate 1 part

[0069] h 2 o 2 (30% concentration) 13 parts

[0070] The preparation process for dealing with drying oils is as follows:

[0071] Weigh linseed oil according to the formula and place it in an appropriate container, add cobalt naphthenate and H 2 o 2 , at room temperature, stir well to obtain dry oil.

[0072] 2. Preparation of modified plant fibers

[0073] The quality formula of plant fiber modification is as follows:

[0074] 100 parts of dry plant fiber powder (fir powder, 80 mesh)

[0075] Treat dry oil 4 parts

[0076] The preparation process of modified plant fiber is as follows:

[0077] Drying the plant fiber powder with an airflow cyclone dryer or other drying equipment until the water content is lower than 2%, to obtain a dry plant fiber powder;

[0078] Weigh the plant fiber powder accordin...

Embodiment 2～5

[0106] The preparation process of Examples 2-5 is the same as that of Example 1, except that the formula is different. The formulations of Examples 2-5 are shown in Table 2 to Table 4.

[0107] Table 2: Preparation formula for treating drying oils

[0108] Example

[0109] Table 3: Preparation formula of modified plant fiber powder

[0110] Example

[0111] 5

[0112] Table 4: Preparation formula of modified plastics

[0113] Example

[0114] Table 5: Preparation formula of wood-plastic composites

[0115]

[0116] After testing, the wood-plastic composite materials prepared according to the above formula all have low water absorption (the absorption rate is lower than 3% after soaking in water for 2 months), and have good tensile strength, bending strength and impact strength.

Embodiment 6

[0118] The preparation steps of the modified plant fiber are the same as in Example 1, wherein the drying oil is processed in the following manner: take an appropriate amount of tung oil, drier or 30% H 2 o 2 Stir evenly according to the formula (mass ratio), in which tung oil + H 2 o 2 (100:13), tung oil + drier (100:2), tung oil + drier + H 2 o 2 (100:2:13) these three drying oils, wherein the drier is cobalt naphthenate. After discharging, it is placed under the following conditions for curing, and the curing results are as shown in Table 6:

[0119] Table 6: Treatment methods for drying oils

[0120]

[0121] It can be seen from the above chart that increasing the temperature, using ultraviolet photocatalysis and adding an appropriate amount of drier can shorten the curing time of the drying oil. The drier and ultraviolet rays promote the formation of free radicals, and adding an appropriate amount of hydrogen peroxide increases the internal dryness. The contact r...

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Abstract

The invention discloses a method for processing modified plant fibers of a polyolefine wood-plastic composite, wherein the polyolefine wood-plastic composite is prepared by main raw materials of the modified plant fibers and modified plastics. The method for processing modified plant fibers comprises the following steps: uniformly mixing 100 mass portions of dry plant fiber powder with 1-10 mass portions of processed dry oil in a mixer after heating to 90-100 DGE C; and stilling the mixture till the dry oil is cured to obtain the modified plant fibers. The processed dry oil is prepared by adding 1-3 mass portions of siccative and 5-20 mass portions of H2O2 solution with concentration of 30 percent under stirring, and uniformly mixing the mixture. By processing the dry oil, the invention obviously shortens the curing time, enhances the curing efficiency of the plant fibers processed by dry oil, and greatly enhances the production efficiency.

Description

(1) Technical field [0001] The invention relates to a treatment method for modified plant fibers of polyolefin wood-plastic composite materials with low water absorption rate. A polyolefin wood-plastic composite material with a low water absorption rate, and the present invention particularly provides a high-efficiency treatment method for preparing modified plant fibers of the polyolefin wood-plastic composite material with a low water absorption rate. (2) Background technology [0002] Wood-Plastic Composites (WPC for short) is a kind of material prepared by high-temperature extrusion (or injection molding, pressing, etc.) A new composite material whose appearance and performance are similar to natural wood, and its products are mainly used as a substitute for natural wood. [0003] The plant fiber powder used in the preparation of wood-plastic composite materials is mainly agricultural and forestry waste, such as wood powder, bamboo powder, bran powder, crop straw powder...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L51/06C08J3/24C08L91/00C08L97/02
Inventor 吕群李珊珊
Owner HANGZHOU NORMAL UNIVERSITY
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