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Density board and manufacture method thereof

A density board and isocyanate technology, applied in the field of building materials, can solve problems such as unreasonable raw materials and fleece pollution, and achieve the effects of eliminating formaldehyde release, enhancing adhesion, board strength and internal bonding strength

Inactive Publication Date: 2015-03-18
山东华鑫资源环保科技开发有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the unreasonable raw materials of medium and high density boards in the prior art lead to the pollution of fleece, the embodiment of the present invention proposes a density board and its preparation method

Method used

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  • Density board and manufacture method thereof

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preparation example Construction

[0018] At the same time, the embodiment of the present invention also proposes a method for preparing any of the aforementioned density boards, including:

[0019] fully mixing the straw fiber and isocyanate, and vacuum dehydrating and drying, so that the moisture content of the mixture is 5-15%;

[0020] After the raw materials are paved and formed by external demoulding, they are pre-pressed at a pressure of 0.5-2.5 MPa;

[0021] Then adjust the pressure to 2-6MPa, and perform hot pressing at a temperature of 150-230°C;

[0022] After demoulding, it is processed to obtain the finished product.

[0023] Wherein, the processing includes: cutting and sanding. The pre-pressing time is 20-120 seconds. The time for the hot pressing is 100-250 seconds.

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Abstract

The invention provides a density board and a manufacture method thereof. The density board is manufactured from, by weight, 90 to 98 of straw fibers and 2 to 10 of isocyanate. The manufacture method thereof includes subjecting the straw fibers and the isocyanate to full mixing and vacuum dewatering and drying so that the moisture content of the mixture is 5% to 15%; subjecting raw materials to mat formation by means of an external demolding manner and pre-pressing the raw materials under the pressure of 0.5MPa to 2.5MPa; subsequently, regulating the pressure into 2MPa to 6MPa and performing hot press molding at the temperature of 150 DEG C to 230 DEG C; performing demolding followed by processing to obtain a finished product. According to the density board, crop straws are used, and an adhesive is improved, so that the condition that strength of products is reduced due to deformation caused by water absorption is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a density board and a preparation method thereof. Background technique [0002] Density board is a material often used in building decoration. According to its density, it can be divided into high-density board, density board and low-density board. Due to its soft texture and high impact resistance, MDF has uniform density after pressing and is easy to reprocess. It is a good material for making furniture. High-density board is made by grinding small-caliber wood and adding glue under high temperature and high pressure. The disadvantage is that the pollution is serious. However, there are still many defects in these products, such as low strength, high water absorption, and easy deformation. Most of these products use urea-formaldehyde resin as an adhesive, which will cause a large amount of formaldehyde gas to be released and endanger human health. Therefore, these...

Claims

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Application Information

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IPC IPC(8): B27N3/04B27N3/08C09J175/04
CPCB27N3/04B27N3/002B27N3/08C09J175/04
Inventor 张延君谢宁郭胜治
Owner 山东华鑫资源环保科技开发有限公司
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