Isocyanate modified urea-formaldehyde resin adhesive and preparation method thereof

A urea-formaldehyde resin glue, isocyanate technology, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problem of affecting the modification effect and use, the difficulty of dispersing isocyanates, and the short storage period of urea-formaldehyde resins, etc. The problem is to shorten the hot pressing time, improve the water resistance, and the reaction conditions are easy to achieve.

Active Publication Date: 2019-03-01
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are three main problems in this research at present: (1), isocyanate is difficult to disperse in urea-formaldehyde resin; (2), the amount of isocyanate in modified urea-formaldehyde resin is extremely low, generally lower than 2%; (3), isocyanate modification The post-urea-formaldehyde resin has a very short shelf life
These problems have seriously affected the modification effect and application of isocyanate to urea-formaldehyde resin.

Method used

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  • Isocyanate modified urea-formaldehyde resin adhesive and preparation method thereof
  • Isocyanate modified urea-formaldehyde resin adhesive and preparation method thereof
  • Isocyanate modified urea-formaldehyde resin adhesive and preparation method thereof

Examples

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preparation example Construction

[0041] A preparation method of isocyanate modified urea-formaldehyde resin adhesive includes the following steps:

[0042] S1. The sealing agent is added to the urea-formaldehyde resin under stirring conditions, and the urea-formaldehyde resin solution is obtained after uniform mixing;

[0043] S2. The isocyanate is added to the solvent under vacuum, and the isocyanate solution is obtained after uniform mixing;

[0044] S3. Add the isocyanate solution obtained in step S2 to the urea-formaldehyde resin solution obtained in step S1 under stirring conditions, and mix uniformly to obtain an adhesive.

[0045] The preparation method of the invention has simple steps, easy reaction conditions to realize, and can be prepared in a large amount without subsequent special treatment processes, reaction conditions are easy to control, low cost, clean and pollution-free.

Embodiment 1

[0047] An isocyanate modified urea-formaldehyde resin adhesive of the present invention, wherein the isocyanate content is 15% (adhesive solid content).

[0048] The preparation method of the isocyanate modified urea-formaldehyde resin adhesive of this embodiment includes the following steps:

[0049] (1) Weigh the raw materials according to the percentage of parts by mass, 22g of polymerized isocyanate, 200g of urea-formaldehyde resin, 12g of sodium bisulfite, 10g of acetone, viscosity of polymerized isocyanate of 160mPa·s, and mass fraction of isocyanate group (-NCO): 28%; urea-formaldehyde resin viscosity is 180mPa·s, solid content is 65%; acetone concentration is analytically pure.

[0050] (2) Add sodium bisulfite to the urea-formaldehyde resin at room temperature. Stir the urea-formaldehyde resin continuously during the adding process to dissolve and disperse the sodium bisulfite evenly in the urea-formaldehyde resin. After the sodium bisulfite is added, continue Stir and stir...

Embodiment 2

[0062] An isocyanate modified urea-formaldehyde resin adhesive of the present invention, wherein the isocyanate content is 10% (solid content of the adhesive).

[0063] The preparation method of the isocyanate modified urea-formaldehyde resin adhesive of this embodiment includes the following steps:

[0064] (1) Weigh the raw materials according to the percentage by mass, polymer isocyanate 14g, urea-formaldehyde resin 200g, sodium bisulfite 10g, acetone 6g, polymer isocyanate viscosity 180mPa·s, and the mass fraction of isocyanate group (-NCO) is 30%; urea-formaldehyde resin viscosity is 200mPa·s, solid content is 65%; sodium sulfite and acetone concentrations are both analytically pure.

[0065] (2) Add sodium bisulfite to the urea-formaldehyde resin at room temperature. Stir the urea-formaldehyde resin continuously during the adding process to dissolve and disperse the sodium bisulfite evenly in the urea-formaldehyde resin. After the sodium bisulfite is added, continue Stir and s...

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Abstract

The invention discloses an isocyanate modified urea-formaldehyde resin adhesive, and further provides a preparation method of the isocyanate modified urea-formaldehyde resin adhesive. The isocyanate modified urea-formaldehyde resin adhesive is prepared from the following raw materials in percentage by mass: 5%-30% of isocyanate, 1%-8% of a solvent, 65%-95% of urea-formaldehyde resin and 2%-10% ofa blocking agent. The preparation method comprises the steps that the blocking agent is uniformly mixed with the urea-formaldehyde resin to obtain a urea-formaldehyde resin solution, the isocyanate isuniformly mixed with the solvent to obtain an isocyanate solution, the isocyanate solution is added to the urea-formaldehyde resin solution and mixed uniformly, and the adhesive is obtained. The isocyanate modified urea-formaldehyde resin adhesive has a long storage time and uniform dispersion, and the preparation method is simple in operation.

Description

Technical field [0001] The invention relates to the preparation of an adhesive for artificial boards, in particular to an isocyanate modified urea-formaldehyde resin adhesive and a preparation method thereof. Background technique [0002] Urea-formaldehyde resin is one of the most widely used adhesives in wood-based panel production, and its usage accounts for more than 60% of the adhesives in the entire wood processing industry. Compared with other adhesives for wood-based panels, urea-formaldehyde resin has the advantages of low cost, fast curing speed and convenient operation. However, urea-formaldehyde resins are poor in water resistance, and wood-based panels produced using urea-formaldehyde resins are generally only used indoors. In addition, these wood-based panels will release formaldehyde during use. Therefore, how to improve the water resistance of urea-formaldehyde resin, reduce its formaldehyde emission, and retain its original excellent characteristics, has always ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/32C08G12/40
CPCC08G12/40C09J161/32
Inventor 刘明卿彦吴义强李贤军李新功
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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