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Formaldehyde-free flame-retardant plywood and preparation method thereof

A plywood, formaldehyde technology, applied in the direction of manufacturing tools, adhesive types, adhesive additives, etc., can solve problems such as damage, achieve good physical and mechanical properties, improve bonding strength, and excellent bending resistance.

Inactive Publication Date: 2017-07-21
烟台市宝翔木业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of plywood will cause great harm to the human body due to the presence of formaldehyde

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: A formaldehyde-free flame-retardant plywood, including a ply, the ply is a veneer cut from a log, and an adhesive layer is provided on the surface of the veneer and between the boards. The adhesive layer includes magnesium oxide, magnesium chloride and polyvinyl alcohol, wherein the content of magnesium oxide in the adhesive layer is 55%, the content of magnesium chloride is 35%, and the content of polyvinyl alcohol is 10%.

[0022] The preparation method of the above-mentioned formaldehyde-free flame-retardant plywood is as follows:

[0023] The first step: technical solution The veneer of log rotary cutting is aired or dried naturally, and the thickness can be controlled at 1.70mm-3.6mm according to needs.

[0024] The second step: Add 2 times the amount of pure water to the magnesium chloride to fully dilute it to form a solution, let it stand for 24 hours, put it into the reaction kettle to heat and stir, and when the temperature is about 30°C, slowly ...

Embodiment 2

[0030] Embodiment 2: A formaldehyde-free flame-retardant plywood, including a ply, the ply is a veneer cut from a log, and an adhesive layer is provided on the surface of the veneer and between the boards. The adhesive layer includes magnesium oxide, magnesium chloride and polyvinyl alcohol, wherein the content of magnesium oxide in the adhesive layer is 55%, the content of magnesium chloride is 32%, and the content of polyvinyl alcohol is 8%. The adhesive layer is also provided with a small material, the small material is a foaming agent, a diffusing agent and a modifier, the content of the foaming agent in the small material is 1%, and the content of the diffusing agent is 1%. The content of agent is 3%.

[0031] The foaming agent is polyurethane foaming agent.

[0032] The diffusing agent is silicon dioxide.

[0033] The modifier is a titanate coupling agent.

[0034] The preparation method of the above-mentioned formaldehyde-free flame-retardant plywood is as follows: ...

Embodiment 3

[0042] Embodiment 3: A formaldehyde-free flame-retardant plywood, including a ply, the ply is a veneer cut from a log, and an adhesive layer is provided on the surface of the veneer and between the boards. The adhesive layer includes magnesium oxide, magnesium chloride and polyvinyl alcohol, wherein the content of magnesium oxide in the adhesive layer is 40%, the content of magnesium chloride is 30%, and the content of polyvinyl alcohol is 25%. Small material is also added in the adhesive layer, and the small material is a foaming agent, a diffusing agent and a modifier, and the content of the foaming agent in the small material is 2%, and the content of the diffusing agent is 2%. The content of agent is 1%.

[0043] The foaming agent is polyurethane foaming agent.

[0044] The diffusing agent is silicon dioxide.

[0045] The modifying agent is a silane coupling agent.

[0046] The preparation method of the above-mentioned formaldehyde-free flame-retardant plywood is as fol...

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PUM

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Abstract

The invention discloses formaldehyde-free flame-retardant plywood and a preparation method thereof. The formaldehyde-free flame-retardant plywood comprises a plate layer. The plate layer is veneer. An adhesive layer is arranged on the surface of the veneer and comprises magnesium oxide, magnesium chloride and polyvinyl alcohol. A small material is further added into the adhesive layer and is one or more kinds of a foaming agent, a dispersing agent and a modifying agent. Through combined use of the polyvinyl alcohol and the magnesium chloride and a cold pressing process, the produced plywood has extremely good physical and mechanical properties, is free of formaldehyde, flame-retardant and high in strength and has flexibility and the mothproof property.

Description

technical field [0001] The invention relates to the technical field of plywood, in particular to a formaldehyde-free flame-retardant plywood and a preparation method thereof. Background technique [0002] The glue that existing plywood is used mainly uses the reaction product of formaldehyde, urea, a small amount of polyvinyl alcohol. The plywood produced contains formaldehyde, is flammable, and is not waterproof. Adding melamine to the glue creates a waterproof glue, but the resulting plywood also contains formaldehyde and is flammable. The existing soybean glue is environmentally friendly and has no formaldehyde, but the bonding strength is insufficient, flammable, and not waterproof. Existing plywood emits a large amount of harmful gas during production. Plywood will cause great harm to the human body due to its formaldehyde content during use. In order to solve the problem of formaldehyde in plywood, after several years of study, discussion, and investment of a lot o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/04C09J11/04C09J129/04C08K3/16C08K3/22
CPCB27D1/04C08K3/16C08K3/22C09J11/04C09J129/04
Inventor 于洪涛于昊翔
Owner 烟台市宝翔木业有限公司
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