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Coconut-fiber-reinforced crop straw composite material and manufacture method thereof

A technology for crop straws and composite materials, applied in the field of biomass composite materials and its manufacturing, can solve the problems of increasing capital investment in equipment, single performance of composite materials, and rising prices, and achieves easy processing and preparation, simple preparation process, and low cost. The effect of preparation cost

Inactive Publication Date: 2013-05-01
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, more or less use of isocyanate adhesives will increase the cost of product preparation, and isocyanate is easy to react with water, which correspondingly increases the requirements for the airtightness of sizing equipment in the production line. To solve the demoulding problem, these have increased the investment of equipment funds; at the same time, with the large-scale utilization of wood and bamboo resources, the contradiction between supply and demand has become increasingly prominent, and the price has also increased day by day, resulting in the mixed preparation of wood and bamboo resources. The cost of wood-based panels has increased, and the performance of composite materials is relatively simple; therefore, finding new methods or new hybrid materials to prepare crop straw composite materials can not only reduce the preparation cost of crop straw wood-based panels, but also improve its adhesive properties. It is an important problem to be solved urgently to expand the application field of crop straw wood-based panels.

Method used

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  • Coconut-fiber-reinforced crop straw composite material and manufacture method thereof
  • Coconut-fiber-reinforced crop straw composite material and manufacture method thereof
  • Coconut-fiber-reinforced crop straw composite material and manufacture method thereof

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preparation example Construction

[0018] Preparation and alkali treatment of straw shavings: The harvested and air-dried rice stalks are first sprayed with water to a moisture content of 30% to 40%, and then the rice stalks are pulverized in a plant rubbing machine so that they can be Obtain filament long flakes and retain the mechanical properties of straw; the crushed straw, first use a wire mesh with a mesh size of 10mm × 10mm to screen out large-sized straw scraps for re-grinding, and then use 8-mesh sieves are used for screening, and the straw scraps on the screen are used as the main raw materials for board making; the straw scraps are sprayed with a dilute sodium hydroxide solution, the lye concentration (mass fraction) is 1.5%, and the material-to-liquid ratio is 10. : 50 (g:ml), the treatment time is 8~12h, and the drying temperature is 90 ℃, and the moisture content is 3% ± 1%; The weight percentage is as follows: 40 mesh accounts for 10%, and the length of the straw shavings is 1~4cm. After alkali ...

Embodiment

[0027] In the above-mentioned preparation process parameters and attached figure 1Under the preparation technological process, preparation is added with coconut fiber but does not apply the composite straw board of isocyanate adhesive, wherein coconut fiber quality accounts for 40% of the total weight of coconut fiber and straw scraps, detects its performance according to the standard, the test that draws The results are as follows: the static bending strength is 25.31MPa, the flexural elastic modulus is 2.84GPa, the internal bonding strength is 0.54MPa, the 24h water absorption thickness expansion rate is 14.05%, and the impact toughness is 24.48KJ / m 2 , the bending toughness is 1802.04N·mm, and the damping ratio is 3.773%. It can be seen that the properties of the coconut fiber reinforced straw composite material also meet the requirements of the standard, and the toughness and damping performance of the composite material have been greatly improved. Compared with Comparativ...

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Abstract

The invention discloses a coconut-fiber-reinforced crop straw composite material and a manufacture method thereof, aiming to provide the strong-toughness and environment-friendly biomass composite material having good mechanical property, gluing property, toughness and vibration damping property. The coconut-fiber-reinforced crop straw composite material is formed by adding coconut fibers in crop straw units and uniformly dispersing as well as crossing and interconnecting the coconut fibers in a composite material system to form a bulky mesh structure, wherein the mass fraction of the coconut fibers in the system is 10-50%. The manufacture method comprises the following steps of: preparing and preprocessing of the straw units, preparing of the coconut fibers, unit mixing, gluing, paving and billet assembling, prepressing, hot-press or cold-press molding, postprocessing and the like. The coconut-fiber-reinforced crop straw composite material is free from isocyanate adhesives, so that the preparation cost of an artificial board can be reduced; and the coconut-fiber-reinforced crop straw composite material can be used as a structure material and a damping material and applied to bearing structures and in rigid use environments with frequent vibration fatigue actions and easily occurring impulse loads so as to play roles of bearing, supporting, damping and denoising, and thus, the application field of the crop straw artificial board is enlarged.

Description

technical field [0001] The invention relates to a biomass composite material and a manufacturing method thereof, and more particularly, to a method for preparing a strong and tough structural biomass composite material by using crop straw, coconut fiber and adhesive. Background technique [0002] Crop straw is one of the natural biomass resources with wide distribution and large accumulation in my country, mainly including rice straw, wheat straw and corn straw. The surface of the straw contains a lot of wax and silicon, which makes the surface wettability very poor. It is difficult to achieve good bonding performance with ordinary adhesives. Therefore, various methods are generally adopted to improve the composite The bonding performance of the material leads to the complexity of the preparation process of the crop straw wood-based panel and the substantial increase of the preparation cost. [0003] In the existing patent documents and scientific research documents, in order...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/04B27N3/12
Inventor 张利胡英成李利芬
Owner NORTHEAST FORESTRY UNIVERSITY
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