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Composite urea-formaldehyde glue composition and application method thereof

A composition and adhesive technology, applied in the directions of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems that cannot be used as outdoor wood-based panels, wood-based panels release formaldehyde, poor hot water resistance, etc. Achieve the effect of reducing the production of harmful substances, especially free aldehydes, reducing the amount of urea-formaldehyde glue applied, and reducing the release of free aldehydes

Inactive Publication Date: 2013-10-23
呼伦贝尔林拓科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the main defect of urea-formaldehyde glue is that formaldehyde, the main raw material for producing the glue, seriously pollutes the environment and harms the human body.
[0008] As we all know, urea-formaldehyde resin also has some obvious disadvantages. In addition to poor aging resistance, poor hot water resistance, and can not be used as glue for outdoor wood-based panels, its fatal flaw is the problem of formaldehyde release from glued wood-based panels.
With the increasing awareness of people's outdoor and indoor environment, health awareness, and quality of life, people are more and more aware that urea-formaldehyde resin adhesives will emit formaldehyde during use, and its glued wood-based panels will also continuously release formaldehyde during use. formaldehyde, pollutes the air, and damages people's health; especially in the production process of urea-formaldehyde resin for particleboard, there is also the problem of formaldehyde pollution emission, which is very harmful to the surrounding environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 60 parts of urea-formaldehyde resin

[0048] 20 parts bark powder

[0049] illite 1 part

[0050] 1 part pyrophyllite

[0051] 1 part muscovite

[0052] Negative ion powder 2 parts

[0053] Xu Yongtu 1 part

[0054] Calcite 1 part

[0055] 1 carbon fiber

[0056] Shell powder 2 parts

[0057] 20 parts of water.

[0058] The size of the carbon fiber is 100nm, the particle diameter of the bark powder is 80 mesh, and the particle diameter of other mineral and shell powder is 100 mesh.

[0059] For the production of 3-layer plywood: the thickness of the veneer is 1.3-1.4mm, the moisture content of the veneer is ≤8%, and the amount of glue is 300g / cm 2 (double-sided), hot-pressing pressure 3.5MPa, temperature 160°C, hot-pressing time 7 minutes, aged for 24 hours after unloading. Take a 2cm×2cm test piece, soak it in hot water at 60°C, and test it for 72 hours. The bonding strength of the plywood is 2MPa, the wood breaking rate is 100%, and the formaldehyde emission i...

Embodiment 2

[0061] Urea-formaldehyde resin 80 parts

[0062] 10 parts bark powder

[0063] illite 1 part

[0064] 1 part pyrophyllite

[0065] 1 part muscovite

[0066] Negative ion powder 1 part

[0067] Xu Yongtu 1 part

[0068] Calcite 1

[0069] 1 carbon fiber

[0070] Shell powder 1 part

[0071] 2 parts of water.

[0072] The size of the carbon fiber is 200nm, the particle size of the bark powder is 150 mesh, and the particle size of other minerals and shell powder is 120 mesh.

[0073] For the production of 5-layer birch plywood: the thickness of the veneer is 1.3-1.4mm, the moisture content of the veneer is ≤7%, and the glue amount is 280g / cm 2 (double-sided), hot-pressing pressure 1.0MPa, temperature 100-120°C, hot-pressing time 7 minutes, after unloading the board, let it stand for 24 hours. Take a 2cm×2cm test piece and soak it in hot water at 60°C for 72 hours for the test. The bonding strength of the plywood is 2.5MPa, the wood breaking rate is 100%, and the formald...

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Abstract

The invention relates to a composite urea-formaldehyde glue composition and an application method thereof. The composition comprises urea-formaldehyde resin, bark powder, illite, pyrophyllite, muscovite, anion powder, halloysite, calcite, carbon fiber, shell powder and water. When a certain amount of larch bark powder, which contains abundant tannin and lignin, is added into a urea-formaldehyde resin glue in due time, the larch bark powder can perform the functions of substituting equal amount of glue, saving the glue and lowering the free phenols and aldehydes, and can also enhance the quality of the artificial board and prevent the artificial board from cracking. The bark is a wood production leftover, and is a pure natural nontoxic biomass material; and thus, when the bark is substituted for part of the urea-formaldehyde glue, the artificial board production technique, including gluing, hot pressing and the like, is not changed, the inspection proves that the produced artificial board satisfies the national standard, and the release amount of residual aldehydes can be greatly lowered.

Description

[0001] technical field [0002] The invention belongs to the field of wood science and technology in forestry engineering, and in particular relates to a composite urea-formaldehyde adhesive composition and an application method thereof. Background technique [0003] Urea-formaldehyde resin adhesive is widely used in the field of wood-based panel production. Because of its simple production process, low price and good bonding performance, there is no glue used in wood-based panel production in the world that is better than urea-formaldehyde resin in terms of performance, price and process. glue to completely replace it. [0004] But the main defect of urea-formaldehyde glue is: the main raw material formaldehyde of producing this glue seriously pollutes environment and harms human body. Free formaldehyde escapes during the production and use of wood-based panels, and the furniture and decorated houses release toxic gas formaldehyde for a long time, seriously endangering peo...

Claims

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Application Information

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IPC IPC(8): C09J161/24C09J197/02C09J11/04
Inventor 周广胜周轶
Owner 呼伦贝尔林拓科技有限责任公司
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