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A kind of melamine-urea-formaldehyde copolycondensation resin adhesive for laminated material and preparation method thereof

A technology of copolycondensation resin and melamine, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems such as the decline of resin water resistance, no public reports, etc., to prevent surface glue shortage , The effect of reducing the amount of free formaldehyde, and the reaction process is stable and easy to control

Inactive Publication Date: 2018-08-10
SOUTHWEST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Melamine resin has high boiling water resistance, but with the addition of urea-formaldehyde resin, the water resistance of the final resin decreases
[0018] Through document retrieval, do not see the public report identical with the present invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Add 130 parts of 37% formaldehyde aqueous solution into the reaction kettle, and adjust the pH value to 8.6 with 30% NaOH aqueous solution;

[0043] (2) Under stirring conditions, when heating to 50-55°C, add 26.8 parts of urea and 2.4 parts of polyvinyl alcohol for the first time;

[0044] (3) Continue to heat up to 88-90°C, adjust the pH value to 5.0 with 10% formic acid solution, and keep warm for 30 minutes;

[0045] (4) Adjust the pH value to 8.5 with 30% NaOH aqueous solution, add 38.3 parts of melamine, and continue the insulation reaction until the water miscibility is 200%;

[0046] (5) Use 30% NaOH solution to adjust the pH value to 9.2, stop heating, and when the temperature drops to 40°C, add 11.5 parts of urea for the second time;

[0047] (6) Insulate and react for 30 minutes, then cool and discharge.

[0048] Use the prepared MUF resin to prepare glulam: select wood with a moisture content below 15% as the bonding material, apply glue on the surface...

Embodiment 2

[0054] (1) Add 130 parts of 37% formaldehyde aqueous solution into the reaction kettle, and adjust the pH value to 8.9 with 30% NaOH aqueous solution;

[0055] (2) Under stirring conditions, when heating to 50-55°C, add 28.5 parts of urea and 3.8 parts of polyvinyl alcohol for the first time;

[0056] (3) Continue to heat up to 88-90° C., adjust the pH value to 5.4 with 10% acetic acid solution, and keep the temperature for 60 minutes;

[0057] (4) Adjust the pH value to 8.5 with 30% NaOH aqueous solution, add 21.4 parts of melamine, and continue the insulation reaction until the water miscibility is 250%;

[0058] (5) Use 30% NaOH solution to adjust the pH value to 8.8, stop heating, and when the temperature drops to 40°C, add 7.1 parts of urea for the second time;

[0059] (6) Insulate and react for 30 minutes, then cool and discharge.

[0060] Use the prepared MUF resin to prepare glulam: select wood with a moisture content below 15% as the bonding material, apply glue on...

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Abstract

The invention discloses a melamine-urea-formaldehyde copolycondensation resin adhesive for laminated wood and a preparation method thereof. The melamine-urea-formaldehyde copolycondensation resin adhesive is prepared in allusion to the outdoor-grade laminated wood with relatively water resistance. The water resistance of formaldehyde-urea-melamine resin is ensured by controlling melamine-urea-formaldehyde resin preparation technological conditions on the basis of ensuring definite adding amount of melamine, and meanwhile, polyvinyl alcohol is added in a resin preparation process so as to improve the viscosity of the resin adhesive ultimately. When the melamine-urea-formaldehyde resin is used for preparing the laminated wood, the normal-temperature fast curing of the melamine-urea-formaldehyde resin is ensured by using a mixed type curing agent. The preparation technology of the melamine-urea-formaldehyde copolycondensation resin adhesive disclosed by the invention is simple; the reaction process is stable and easy to control; and the resin has good storage stability and excellent water resistance and can serve as the normal-temperature curing type adhesive for the laminated wood.

Description

technical field [0001] The invention relates to the technical field of wood adhesives, in particular to a melamine-urea-formaldehyde co-condensation resin adhesive for glulam and a preparation method thereof. Background technique [0002] Glulam, also known as glued wood, is a kind of wood product made of planks or small squares glued together in the direction of thickness, width and length according to the parallel direction of wood fibers. One of the great engineering wood materials. The preparation of glulam can realize the large use of small wood and the optimal use of inferior wood, and improve the comprehensive utilization rate of wood. [0003] The quality of glulam products is not only affected by the properties of wood raw materials, but also by the properties of adhesives that play a bonding role. As an indispensable raw material for wood products, adhesives have always been the key core technology in the production of wood products. Its bonding performance and b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/32C09J11/04C09J11/06C08G12/40
Inventor 雷洪杜官本席雪冬吴志刚
Owner SOUTHWEST FORESTRY UNIVERSITY
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