A kind of modified urea-formaldehyde resin adhesive and preparation method thereof

A technology of urea-formaldehyde resin and adhesive, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of poor water resistance, reduced bonding strength, and increased product cost, and achieve low formaldehyde release The effect of increasing the amount, increasing the cross-linking density, and increasing the degree of branching
CN104762041BInactive Publication Date: 2017-05-10SCHOLAR HOME SHANGHAI NEW MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SCHOLAR HOME SHANGHAI NEW MATERIAL CO LTD
Publication Date
2017-05-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a modified urea resin adhesive and a preparation method thereof. According to the preparation method, formaldehyde and urea in a low molar ratio are taken as raw materials, and a poly-functionality reaction enhancer is taken as a polycondensation agent to replace an acidic polycondensation condition, and the urea resin is synthesized by use of an acid-alkali-acid process; the molecular branching coefficient of the urea resin is increased, the molecular weight of the urea resin is increased under the same viscosity, and the curing cross-linking density of the urea resin can be increased, and furthermore, the bonding strength is improved and the formaldehyde release amount of the bonded products is reduced. The preparation method of the low-toxicity urea resin adhesive has the advantages that non-traditional melamine-epoxy chloropropane-sodium hydroxide reactants are taken as polycondensation agents and the acid-alkali-acid synthesis process is adopted, the basic procedure is close to the conventional process, the process is simple, the operations are convenient, and the existing equipment does not need to be modified.
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Description

technical field

[0001] The invention relates to an adhesive, in particular to a modified urea-formaldehyde resin adhesive used for preparing wood-based panels and a preparation method thereof, belonging to the field of adhesives. Background technique

[0002] With the improvement of people's living standards and the continuous and stable development of construction, decoration, packaging and other industries, the output of wood-based panels in my country has grown rapidly. The total output of wood-based panels, plywood, furniture, and wood flooring has ranked first in the world for many years in a row. In 2013, the total output of wood-based panels in my country was 272 million m3, accounting for about 50% of the world's total output. Based on the average production of 9m3 wood-based panels per ton of adhesive, the consumption of wood adhesives in my country in 2013 was about 30 million tons (solid content 50%), of which urea-formaldehyde resin and its modified products acc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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