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Manufacturing method of high-gluability flame-retardant plywood

A plywood and gluing technology, which is used in the joining of wooden veneers, chemical instruments and methods, manufacturing tools, etc., can solve the problems of poor hydrophilic performance of plywood, easy degumming of plywood, affecting the service life of plywood, etc. temperature, reducing energy consumption, improving the effect of hydrophilicity

Inactive Publication Date: 2017-02-01
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flame retardancy of existing commercial flame retardants is widely recognized, and its flame retardancy has been studied by many predecessors. However, these commercial flame retardants have a great influence on the bonding performance of plywood, which makes the plywood easy to degumming and affects the plywood. service life; and the addition of flame retardants makes the hydrophilic properties of plywood bad, therefore, there is an urgent need for a flame retardant in order to improve the mechanical properties and hydrophilicity of flame-retardant eucalyptus plywood, thereby improving the quality of plywood

Method used

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  • Manufacturing method of high-gluability flame-retardant plywood
  • Manufacturing method of high-gluability flame-retardant plywood
  • Manufacturing method of high-gluability flame-retardant plywood

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Self-made melamine modified urea-formaldehyde resin (MUF) resin is prepared by the following steps:

[0033] (a) Take 424g of formaldehyde and 1.5g of polyvinyl alcohol (PVA), mix them in a four-neck flask, start stirring, adjust the pH value of the mixture to 7.5-8.5 with 40% sodium hydroxide solution, add urea (U1) 149.2 g. Melamine 15g, heat up to 90°C within 10 minutes and adjust the pH value to 7.0-8.0 to obtain the mixed solution 1, keep it warm for 50 minutes, and make the mixed solution pH value 6.5-8.0 during the heat preservation period;

[0034] (b) Add formic acid solution to the mixed solution 1 obtained in step (a) twice, add formic acid solution for the first time to adjust the pH value to 5.0-7.0, keep the temperature at 85°C for 30 minutes, then add formic acid solution for the second time , that is, add a small amount of formic acid solution, when flake precipitation occurs, it means reaching the end point, once the end point is reached, immediately us...

Embodiment 2

[0041] Self-made melamine modified urea-formaldehyde resin (MUF) resin is prepared by the following steps:

[0042](a) Take 424g of formaldehyde and 1.5g of polyvinyl alcohol (PVA), mix them in a four-neck flask, start stirring, adjust the pH value of the mixture to 7.5-8.5 with 40% sodium hydroxide solution, add urea (U1) 149.2 g. Melamine 15g, heat up to 90°C within 30 minutes and adjust the pH value to 7.0-8.0 to obtain the mixed solution 1, keep it warm for 30 minutes, and make the mixed solution pH value 6.5-8.0 during the heat preservation period;

[0043] (b) Add formic acid solution to the mixed solution 1 obtained in step (a) twice, add formic acid solution for the first time to adjust the pH value to 5.0-7.0, keep the temperature at 95°C for 30 minutes, then add formic acid solution for the second time , that is, add a small amount of formic acid solution, when flake precipitation occurs, it means reaching the end point, once the end point is reached, immediately use...

Embodiment 3

[0050] Self-made melamine modified urea-formaldehyde resin (MUF) resin is prepared by the following steps:

[0051] (a) Take 424g of formaldehyde and 1.5g of polyvinyl alcohol (PVA), mix them in a four-neck flask, start stirring, adjust the pH value of the mixture to 7.5-8.5 with 40% sodium hydroxide solution, add urea (U1) 149.2 g. Melamine 15g, heat up to 90°C within 20 minutes and adjust the pH value to 7.0-8.0 to obtain the mixed solution 1, keep it warm for 40 minutes, and make the mixed solution pH value 6.5-8.0 during the heat preservation period;

[0052] (b) Add formic acid solution to the mixed solution 1 obtained in step (a) twice, add formic acid solution for the first time to adjust the pH value to 5.0-7.0, keep the temperature at 90°C for 30 minutes, then add formic acid solution for the second time , that is, add a small amount of formic acid solution, when flake precipitation occurs, it means reaching the end point, once the end point is reached, immediately us...

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Abstract

The invention discloses a manufacturing method of high-gluability flame-retardant plywood. The manufacturing method of the high-gluability flame-retardant plywood includes the operation steps that (1) impregnation liquid is obtained by mixing a commercial flame retardant solution with the mass concentration being 15-20%, a magnesium hydrate solution with the mass concentration being 0.5-1.0%, and a sodium dehydroacetate solution with the mass concentration being 0.1-0.3%; (2) after being impregnated, veneers are dried to reach the equilibrium moisture content; and (3) ammonium chloride and flour are added to self-made MUF resin, the mixture is evenly stirred and then evenly smeared on the veneers dried in the step (2), afterwards, hot pressing is carried out under the conditions that the temperature is 110-120 DEG C and the pressure is 1.2-1.5 MPa, and the high-gluability flame-retardant plywood is obtained. The gluing strength of the flame-retardant plywood manufactured through the method is enhanced, the hydrophily of the flame-retardant plywood is greatly improved, and thus the purpose of improving the quality of the flame-retardant plywood is realized. Furthermore, after the impregnation liquid is adopted for impregnation, the hot pressing temperature of the veneers is reduced, energy consumption is reduced, and production efficiency is improved.

Description

technical field [0001] The invention relates to a preparation method of flame-retardant plywood, in particular to a preparation method of high-adhesion flame-retardant plywood. Background technique [0002] Wood itself is mainly composed of three substances: cellulose, hemicellulose, and lignin, and is a porous anisotropic organic material. Modern furniture often uses wood-based panels such as fiberboard, plywood, and particle board and solid wood as raw materials. Wood-based panels can make full use of wood resources. Wood chips and shavings produced by solid wood processing can be processed into wood-based panels through a series of processes. Wood has always played a very important role in the history of human development because of its unique properties such as easy processing, easy acquisition, low heat transfer coefficient, adjustable temperature and humidity, and excellent environmental characteristics. It has been widely used in construction and decoration. , furnit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/08B27K3/02B27K3/52B27K5/04B32B37/06B32B37/10B32B37/12C08G12/38
CPCB27D1/08B27K3/02B27K3/52B27K5/04B27K2240/30B32B37/06B32B37/10B32B37/12B32B2037/1269C08G12/38
Inventor 李英健秦志永符韵林黄祖威石休复韦鹏练
Owner GUANGXI UNIV
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