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Structural wood-based gypsum composite material and preparation method thereof

A technology for composite materials and structures, applied in wood treatment, impregnated wood, wood impregnation, etc., can solve problems such as poor fire resistance, achieve high mechanical properties, easy low-cost manufacturing, and simple process structure

Active Publication Date: 2018-11-02
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the fact that the mechanical properties of the existing gypsum composite boards cannot meet the structural requirements, and that there is a retarder added in the production process of the particleboard gypsum boards, which leads to the reduction of the mechanical properties of the structure, the present invention provides a wood-based gypsum composite board for structural use. The material and its preparation method, the shavings are pre-impregnated with phenolic resin, dried and then sprayed with silane coupling agent on its surface, and then compounded with gypsum, which retains the properties of both fire resistance and wood strength of gypsum, overcomes the The brittleness of gypsum itself and the lack of fire resistance of wood-based composite materials improve the mechanical properties of wood-based gypsum composite materials and meet the structural performance requirements of the construction industry

Method used

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  • Structural wood-based gypsum composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 Shown is a wood-based gypsum composite material for structure and its preparation method. The wood unit, that is, wood shavings, is impregnated with phenolic resin in advance, and the impregnated wood shavings are dried to control the moisture content, and then sprayed on the surface after drying Silane coupling agent, and mixed with gypsum to pave the slab, and then use hot pressing to ensure that the cured phenolic resin will bond the gypsum and shavings to form, perform pressure relief and demoulding, and then humidify and maintain to prepare the structure Composites with wood-based gypsum.

[0038] Among them, the ratio of wood to paste is 0.35. In order to reduce equipment investment and increase turnover speed, the wood shavings are pre-impregnated with phenolic resin with a solid content of 45% under normal temperature and pressure. The impregnation time is at least 24 hours. Moisture content is 8%, spray silane coupling agent on its surface aga...

Embodiment 2

[0041] The specific method is the same as that in Example 1, except that the wood shavings are pre-impregnated with a phenolic resin with a solid content of 35%, and the impregnation pressure impregnation has a pressure of 0.4 MPa and an impregnation time of 40 min. The moisture content of wood shavings after drying is not higher than 6%. The added amount of the silane coupling agent is 4% of the dry shavings mass. The silane coupling agent solution uses absolute ethanol as a solvent, and its concentration is 6%, so as to ensure that the silane coupling agent is completely hydrolyzed and uniformly dispersed on the surface of the shavings. The hot-pressing temperature is 140°C, and the hot-pressing time is 20 minutes to ensure that the phenolic resin is fully cured and the board is preliminarily formed. Humidification and maintenance are carried out after hot pressing, and water spraying is used for humidification, and 0.30 times the moisture of gypsum is applied to the slab t...

Embodiment 3

[0044] The specific method is the same as that in Example 1, except that the wood shavings are pre-impregnated with a phenolic resin with a solid content of 30%, and the impregnation is pressure impregnated with a pressure of 0.8 MPa and an impregnation time of 30 minutes. The moisture content of wood shavings after drying is not higher than 4%. The added amount of the silane coupling agent is 6% of the dry shavings mass. The silane coupling agent solution uses absolute ethanol as a solvent, and its concentration is 5%, so as to ensure that the silane coupling agent is completely hydrolyzed and uniformly dispersed on the surface of the shavings. The hot-pressing temperature is 135°C, and the hot-pressing time is 25 minutes to ensure that the phenolic resin is fully cured and the board is initially formed. Humidification and maintenance are carried out after hot pressing, and water spraying is used for humidification, and 0.30 times the moisture of gypsum is applied to the sla...

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Abstract

Belonging to the construction field, the invention discloses a structural wood-based gypsum composite material and a preparation method thereof. The method includes: wood shaving impregnation, moisture content control, mixing, pavement, hot pressing and curing. According to the invention, phenolic resin can be added to a wood unit to improve the fire resistance and mechanical properties, and a silane coupling agent is added to improve the interface bonding properties of the wood unit and gypsum. The process firstly performs hot-pressing pre-forming and then conducting cold pressing and humidifying curing, is in favor of the formation of needle-like gypsum crystals with high mechanical properties, further improves the mechanical properties of the wood-based gypsum composite material, and has the advantages of simple procedure, reasonable design and easy manufacturing.

Description

technical field [0001] The invention belongs to the field of construction, and in particular relates to a wood-based gypsum composite material for structure and a preparation method thereof. Background technique [0002] In my country, gypsum resources are very rich, but the development and utilization rate is low. Although it can be used in the construction industry, the proportion is too small. my country is rich in fast-growing timber resources. Since the implementation of key forestry projects focusing on fast-growing and high-yielding timber forests in key areas in February 2001, my country's sustainable forestry management has been increasingly improved, and the shortage of timber resources in my country has eased. [0003] The production of existing gypsum particle board adopts semi-dry process, which is invented and patented by Professor Kossatz (Kossatz) of Fraunhofer (Fraunhofer) Wood Research Institute in Germany, and this process is still in use till now. The pr...

Claims

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Application Information

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IPC IPC(8): B27K3/02B27K3/08B27K3/12B27K3/15B27K5/04B28B3/00B28B11/24
CPCB27K3/02B27K3/08B27K3/12B27K3/15B27K5/04B28B3/00B28B11/24B28B11/247
Inventor 岳孔李萌禹邵亚陵刘伟庆贾翀陆伟东汤丽娟吕城龙
Owner NANJING UNIV OF TECH
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