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Copolycondensation resin type formaldehyde catching agent and preparation method thereof

A formaldehyde scavenger and copolycondensation resin technology, which is applied in the direction of aldehyde/ketone condensation polymer adhesive, adhesive, adhesive type, etc. The effect of reducing formaldehyde emission and flexible and easy operation

Inactive Publication Date: 2012-09-19
SOUTHWEST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Combined with the literature search, there is no report of directly using the formaldehyde scavenger of the urea-formaldehyde resin adhesive through a certain polycondensation reaction and partially resinized resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: (each part is parts by weight, gram or kilogram)

[0023] 1) Get 102 parts of urea, 302 parts of formalin solution and 225 parts of water, and adjust the pH value to 8.0 with a 20% NaOH aqueous solution with a weight concentration;

[0024] 2) be warming up to 90 DEG C, and react at this temperature for 45 minutes;

[0025] 3) adjust the pH value to 4.5 with a formic acid aqueous solution with a weight concentration of 10%, and continue to react for 60 minutes;

[0026] 4) Adjust the pH value to 8.0, add 457 parts of urea, sodium borate decahydrate and 54 parts of water, keep warm for 20 minutes, cool, adjust the pH to 8.0~8.5, and discharge.

Embodiment 2

[0027] Embodiment 2: (each part is parts by weight, gram or kilogram)

[0028] 1) Take 207 parts of urea-formaldehyde prepolymer (the weight percentage of each substance is formaldehyde: urea: water = 54: 23: 23), 76 parts of urea and 177 parts of water, and adjust it with NaOH aqueous solution with a weight concentration of 20%. pH to 8.0;

[0029] 2) be warming up to 90 DEG C, and react at this temperature for 30 minutes;

[0030] 3) adjust the pH value to 5.0 with a 10% formic acid aqueous solution with a weight concentration, and continue to react for 60 minutes;

[0031] 4) Adjust the pH value to 8.0, add 323 parts of urea, sodium borate decahydrate, 50 parts of sodium chloride and 54 parts of water, keep warm for 20 minutes, cool, adjust the pH to 8.0~8.5, and discharge.

[0032] Mix the formaldehyde scavenger prepared according to the present invention with urea-formaldehyde resin (the molar ratio of urea to formaldehyde is F / U=1) to prepare a density of 650~700g / cm ...

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Abstract

The invention provides a melamine-urea-formaldehyde copolycondensation resin type formaldehyde catching agent which is made of urea, melamine and formaldehyde by means of copolycondensation reaction, wherein the final molar ratio F / U of the formaldehyde to the urea is 1:2.4-4.0, the formaldehyde is added once, the urea is added twice, the reaction temperature ranges from 85 DEG C to 95 DEG C, and the reaction time is 2-3 hours. The formaldehyde catching agent can be mixed and used with various urea resin adhesives and especially applicable to urea resins prepared with low molar ratio of the formaldehyde to the urea. Strength of main adhesives of urea resins is unaffected within a certain weight addition proportional range. The melamine-urea-formaldehyde copolycondensation resin type formaldehyde catching agent has the advantages of flexibility in use, high comprehensive performances and the like and is applicable to production of various indoor artificial boards.

Description

[0001] technical field [0002] The invention relates to a formaldehyde scavenger of urea-formaldehyde resin adhesive for wood-based panels and a preparation method thereof, belonging to the technical field of wood-based panel production in wood processing. [0003] Background technique [0004] Urea-formaldehyde resin is currently the most widely used adhesive in the wood-based panel industry. However, with the continuous enhancement of people's environmental protection awareness and the continuous improvement of national environmental protection regulations, the formaldehyde release of urea-formaldehyde resin has attracted more and more attention. As one of the main reaction raw materials of urea-formaldehyde resin, formaldehyde has an important impact on human health and has been listed as a suspected carcinogen by the International Cancer Institute. Due to the high concentration of free formaldehyde in UF resin, it not only pollutes the working environment of wood proce...

Claims

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Application Information

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IPC IPC(8): C08G12/38C09J161/24
Inventor 杜官本雷洪邓书端
Owner SOUTHWEST FORESTRY UNIVERSITY
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