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Modified urea-formaldehyde powder adhesive

A technology of modified urea-formaldehyde and adhesives, which is applied in the field of modified urea-formaldehyde powder adhesives and wood glue powder, which can solve the problems of low fracture toughness and easy aging of the adhesive layer, achieve high bond strength and reduce sizing costs , the effect of low free formaldehyde content

Inactive Publication Date: 2004-11-03
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, looking at such products at home and abroad, the main defects of urea-formaldehyde adhesives are still unsolved: low fracture toughness of the cured adhesive layer and easy aging, etc. These defects are the key problems to be solved at present

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment one: in the present embodiment, modified urea-formaldehyde powder binder is each component of wood glue powder and proportioning (wt%) thereof as follows:

[0022] Formula A

[0023] Melamine-urea-formaldehyde rubber powder 79.67%

[0024] Ammonium chloride 0.30%

[0025] Tartaric acid 0.01%

[0026] Maleic anhydride 0.02%

[0027] Polyvinyl acetate-vinyl resin powder 8.00%

[0028] Larch Extract 1.00%

[0029] Coconut Shell Powder 3.50%

[0030] Cornstarch 3.00%

[0031] Flour 2.00%

[0032] Gypsum powder 2.50%

[0033] Put the above-mentioned components into a double-helix conical mixer with a water-cooled jacket according to the above-mentioned process, mix evenly, discharge, and seal the package. The wood glue part prepared by this formula A is light red, and is a special adhesive for mahogany products.

[0034] When in use, water can be added to adjust the glue,...

Embodiment 2

[0037] Embodiment two: present embodiment modified urea-formaldehyde powder binder is each component of wood glue powder and proportioning (wt%) thereof as follows:

[0038] Formula B

[0039] Urea-formaldehyde rubber powder 81.65%

[0040] Ammonium chloride 0.32%

[0041] Tartaric acid 0.01%

[0042] Maleic anhydride 0.02%

[0043] Carboxylated styrene-butadiene latex powder 8.50%

[0044] Citrus Extract 1.00%

[0045] Coconut Shell Powder 1.00%

[0046] Cornstarch 3.00%

[0047] Flour 2.00%

[0048] Gypsum powder 2.50%

[0049] Put the above-mentioned components into a double-helix conical mixer with a water-cooled jacket according to the above-mentioned process, mix evenly, discharge, and seal the package. The wood glue powder prepared by this formula B is light yellow and is suitable for bonding processing of light-colored wood products.

[0050] When in use, water can be add...

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Abstract

The modified urea-formaldehyde powder adhesive for adhering wood product mainly is prepared by using spray dried pure urea-formaldehyde powder or melamine-urea-formaldehyde powder as base material; composite curing agent comprising amine salt of strong acid, organic acid and maleic anhydride; fine water soluble vinyl resin powder, tanning extract and coconut shell powder as toughening, antiageing and free aldehyde absorbing additive; and certain amount of corn powder, gypsum powder and flour as stuffing, and through mixing. The modified urea-formaldehyde powder adhesive has the advantages of high strength, high toughness, ageing resistance, water resistance, chemical corrosion resistance and environment friendship.

Description

technical field [0001] The invention relates to a modified urea-formaldehyde powder adhesive mainly used for bonding wood products, commonly known as wood glue powder. It belongs to the technical field of organic compound binder technology. Background technique [0002] Urea-formaldehyde powder adhesive has the advantages of high shear strength, good water resistance, fast curing at room temperature, long storage period and convenient operation. Since its birth in the sixties in the 20th century, wood glue powder has been widely used in the wood manufacturing industry abroad. In the past ten years, wood glue powder has also developed rapidly in China. However, looking at such products at home and abroad, the main defects of urea-formaldehyde adhesives are still unsolved: low fracture toughness of the cured adhesive layer and easy aging, etc. These defects are the key problems to be solved at present. Contents of the invention [0003] The object of the present invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/24
Inventor 胡宏玖刘红
Owner SHANGHAI UNIV
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