Method for preparing modified urea-formaldehyde resin

A urea-formaldehyde resin and modification technology, which is applied in the field of preparation of modified urea-formaldehyde resin, can solve the problems of low free formaldehyde content, high free formaldehyde content, and failure to meet environmental protection requirements, and achieve the goal of reducing formaldehyde emission and free formaldehyde content Effect
CN100572445CInactive Publication Date: 2009-12-23INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
Publication Date
2009-12-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method for preparing a modified urea-formaldehyde resin, the method comprises mixing and contacting the product of the contact reaction between formaldehyde and urea and a urea-formaldehyde resin modifier, wherein the urea-formaldehyde resin modifier is added at least twice. The free formaldehyde content of the urea-formaldehyde resin prepared by the preparation method of the modified urea-formaldehyde resin provided by the invention is very low, so that the formaldehyde release amount of wood-based panel products can be greatly reduced when used in the wood manufacturing process. For example, the free formaldehyde content of the modified urea-formaldehyde resin prepared by the method provided by the invention can be reduced to no more than 0.20%, so that the plywood prepared by using the modified urea-formaldehyde resin can reach the E1 (≤1.5 mg / liter) regulation in the national standard . In addition, the modified urea-formaldehyde resin prepared by the method provided by the invention can not only be in liquid form, but also in powder form, and can be used under wet and outdoor conditions.
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Description

technical field

[0001] The invention relates to a preparation method of modified urea-formaldehyde resin. Background technique

[0002] Urea-formaldehyde resins, especially melamine-modified urea-formaldehyde resins (MUF), are widely used in the wood manufacturing industry for bonding wood or as adhesives in the production of wood-based materials, such as for particleboard, plywood and various fiberboards. in production. Urea-formaldehyde resin is the reaction product of urea and formaldehyde. Because the water resistance and intensity of this urea-formaldehyde resin are relatively poor, therefore generally use urea-formaldehyde resin modifier to modify the urea-formaldehyde resin of gained, to obtain modified urea-formaldehyde resin such as commonly used melamine-modified urea-formaldehyde resin (MUF), The water resistance and strength of this urea-formaldehyde resin are significantly higher than that of unmodified conventional urea-formaldehyde resin. The urea-formaldeh...

Claims

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