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A curing agent for glued wood adhesive

A curing agent and adhesive technology, applied in the direction of adhesives, adhesive additives, polymer adhesive additives, etc., can solve the problem of large amount of formaldehyde release, achieve the effect of reducing the amount of release, high moisture resistance strength, and achieving room temperature curing

Active Publication Date: 2017-12-05
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem solved by the present invention is to change the shortcoming that the current resorcinol-phenol-formaldehyde resin adopts a single paraformaldehyde curing process and the large amount of formaldehyde released during the use of glued wood products, and provide the market with a room temperature curing, Good water and weather resistance, high bonding strength, suitable for curing agent for structural glued wood adhesives

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 100g of resorcinol-phenol-formaldehyde resin (preparation process is resorcinol:phenol=1:5, formaldehyde:phenol=1.5:1; pre-reaction temperature 65-90°C; co-reaction temperature 65°C, co-reaction time 2h), add 15g of curing agent (magnesium hydroxide with an average particle size of 120nm: paraformaldehyde = 1:2) and 4g of filler (starch, the same below) to prepare adhesive, add 30°C to the pine board after sizing Press and cure for 24 hours, according to the GB / T 50708-2012 standard test, the dry strength is 14.5MPa (wood breaking rate 100%), the wet shear strength is 9.5MPa, and the shear strength after boiling is 11.9MPa. According to GB / T 14074-2006, the free formaldehyde emission of glued wood is determined to be 3.25mg / L.

Embodiment 2

[0028] Take 100g of resorcinol-phenol-formaldehyde resin (the preparation process is the same as in Example 1), add 15g of curing agent (average particle size of 120nm magnesium hydroxide:paraformaldehyde=2:1) ​​and 4g of filler, and place on a pine board After sizing, pressurize and cure at 30°C for 24 hours. Tested according to GB / T50708-2012 standard, the dry strength is 11.6MPa (wood breaking rate 100%), the wet shear strength is 6.7MPa, and the shear strength after boiling is 8.0MPa. According to GB / T 14074-2006, the free formaldehyde emission of glued wood is determined to be 2.15mg / L.

Embodiment 3

[0030] Take 100g of resorcinol-phenol-formaldehyde resin (the preparation process is the same as in Example 1), add 15g of curing agent (calcium hydroxide with an average particle size of 150nm: hexamethylenetetramine=2:1) ​​and 4g of filler After the pine board is glued and cured under pressure at 30°C for 24 hours, according to the GB / T 50708-2012 standard test, the dry strength is 12.5MPa (wood breaking rate 100%), the wet shear strength is 8.1MPa, and the shear strength after boiling is 8.5MPa. According to GB / T 14074-2006, the free formaldehyde emission of glued wood is determined to be 2.05mg / L.

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Abstract

The invention relates to a curing agent of an adhesive for laminated wood and belongs to the technical field of adhesives. The curing agent comprises nano alkaline earth metal hydroxide, wherein the average particle size of nano alkaline earth metal hydroxide does not exceed 300 nm, and nano alkaline earth metal hydroxide accounts for 20wt%-80wt%. The nano alkaline earth metal hydroxide is an effective component of the curing agent and can replace part of paraformaldehyde, the curing effect of the adhesive is better, the wood bonding strength is higher, the amount of released free formaldehyde is small and the weather resistance is good.

Description

technical field [0001] The invention relates to a curing agent for glued wood adhesives, belonging to the technical field of adhesives. Background technique [0002] Adhesives for structural glulam are adhesives used for gluing structural glulam. Structural glulam has large components and can be used outdoors to withstand structural stress. Therefore, adhesives for structural glulam require high bonding strength, low gluing temperature, and good weather resistance, especially in extreme conditions such as humidity, cold and heat. strength. [0003] At present, the matrix resins used for structural glued wood adhesives at home and abroad are mainly resorcinol-phenol-formaldehyde resin and polyurethane. By adding suitable curing agents and fillers, the bonding of glued wood can be realized. The evaluation indicators of adhesive properties mainly include gluing Strength and weather resistance, especially when glulam is glued for outdoor use, it needs to withstand wind, frost,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J11/04C09J11/06C09J11/08C09J161/12
CPCC08K2201/003C08K2201/011C08L2205/03C09J11/04C09J11/06C09J11/08C09J161/12C08L3/02C08L59/00C08K2003/2224C08K2003/2206C08K5/17
Inventor 吴志平覃族吴姝云谢力生李贤军
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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