Heat pressing production method of polyethylene fiber-plant fibre compound material

A polyethylene fiber and plant fiber technology, which is applied in the pretreatment of molding materials, manufacturing tools, flat products, etc., can solve the problems of poor mixing uniformity of polyethylene powder and plant fiber scraps, easy pyrolysis and carbonization of straw, and mechanical properties of plates. Low-level problems, to achieve the effect of easy melting and heat transfer, improved physical and mechanical properties, and favorable heat transfer

Inactive Publication Date: 2008-12-17
NORTHEAST FORESTRY UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that only fine fibers can be used in the production of wood-plastic composite materials by extrusion, the board width is narrow, straw is easy to pyrolyze and carbonize, and the board produced by preheating hot pressing method has low mechanical properties and low polyethylene powder. The problem of poor mixing uniformity and low productivity with plant fiber scraps provides a hot-pressing manufacturing method for polyethylene fiber-plant fiber composites

Method used

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  • Heat pressing production method of polyethylene fiber-plant fibre compound material

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specific Embodiment approach 1

[0010] Embodiment one: the hot-pressing manufacturing method of polyethylene fiber-plant fiber composite material in the present embodiment is as follows: one, the maleic anhydride grafted polyethylene particle that accounts for polyethylene plastic particle quality 3%~6% and polyethylene Plastic particles are mixed, heated and melted at a temperature of 170-180°C, then cooled to room temperature and sawn into polyethylene plastic fibers with a length of 5mm-25mm, a width of 2mm-3.5mm, and a thickness of 0.2mm-1.5mm; 2. Mix the polyethylene plastic fiber obtained in step 1 with the plant debris with a fineness of 10 to 40 meshes to obtain the mixture; 3. Pave the mixture obtained in step 2 into a slab, and then place the slab on two Between the metal backing plates, preheat for 20 to 30 minutes at a pressure of 1 to 3 MPa and a temperature of 150 to 160 °C; 4. Place the preheated slab at a pressure of 4 to 6 MPa and a temperature of 170 to 190 ℃ for 8-15 minutes, and then cool...

specific Embodiment approach 2

[0016] Embodiment 2: This embodiment differs from Embodiment 1 in that the plant debris described in step 2 is wheat straw, straw, flax, cotton stalks, straw or waste wood debris. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0017] Embodiment 3: The difference between this embodiment and Embodiment 1 is that in step 2, the plant debris accounts for 51% to 60% of the total weight of the mixture. Others are the same as in the first embodiment.

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Abstract

A heat pressing method for polyethylene plant fiber composite material relates to a method for manufacturing plant fiber material. The invention solves the problems that only fibril can be applied, plant format is narrower, straw is liable to thermolysis and charring and the mechanical properties of plant manufactured by pre-heat pressing are poor in the production of WPC in the manner of extraction. The method of the invention has the steps that: PE plastic fiber is mixed with crushed plant aggregates to obtain mixture that is paved into a plate base; the plate base is pre heated under a pressure of 1 to 3 MPa and at a temperature of 170 to 190 CEG D; the plate base is kept under a pressure of 4 to 6 MPa for 8 to 15mins; and at last, the plate base is cooled to 70 to 80 CEG D under a pressure of 3 to 6 MPa; and after pressure relief, the plank is obtained. The flexural strength of the plank manufactured in the method of the invention is 20 MPa. The invention adopts the polyethylene in fiber configuration and the crushed aggregates of the plant and the fiber is evenly mixed and has high productivity. In addition, the crushed aggregates of the plant and the fiber can be prevented from being deteriorated and darkened due to high temperature.

Description

technical field [0001] The invention relates to a manufacturing method of plant fiber material. Background technique [0002] Wood-plastic composites have been widely valued due to the effective use of waste wood and plastics to produce high-performance environmentally friendly materials. The current production technology is mainly extrusion. The disadvantage is that it is difficult to discharge when the plant fiber content is high, and the fiber form is usually 40-100 mesh fine fibers; the plate width is narrow because of the mold limit; straw is easy to pyrolyze and carbonize during extrusion, so the raw materials are mainly made of Wood is the main material, which is not only bad for the environment; the width of composite materials made by extrusion process is usually around 200mm. The existing preheating hot-pressing manufacturing method of polyethylene-straw composite materials uses powdery plastic components, but due to the large difference in bulk density with plant...

Claims

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Application Information

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IPC IPC(8): B27N3/04B27N1/00B27N1/02
Inventor 王伟宏王海刚卜凡华朱莹
Owner NORTHEAST FORESTRY UNIVERSITY
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