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Melamine-urea-formaldehyde copolycondensation resin adhesive for laminated wood 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 no public reports, the water resistance of resins declines, etc., and reduce the amount of free formaldehyde. , The effect of preventing the lack of glue on the surface and increasing the viscosity

Inactive Publication Date: 2015-09-09
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) 130 parts of 37% aqueous formaldehyde solution were added to the reactor, and the pH value was 8.6 with 30% NaOH aqueous solution regulation;

[0043] (2) under stirring condition, when heating and warming up to between 50~55 ℃, 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 ℃, adjust the pH value to 5.0 with 10% formic acid solution, and keep the reaction 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 reaction to keep the water mixing to 200%;

[0046] (5) adjust pH value to 9.2 with 30% NaOH solution, stop heating, when cooling to 40 ℃, add 11.5 parts of urea for the second time;

[0047] (6) heat preservation reaction for 30 minutes, cooling and discharging.

[0048] Use the prepared MUF resin to prepare the laminate: select wood with a moisture content of less than 15% as the bonding material, apply glue...

Embodiment 2

[0054] (1) 130 parts of 37% aqueous formaldehyde solution were added to the reactor, and the pH value was 8.9 with 30% NaOH aqueous solution regulation;

[0055] (2) under stirring condition, when heating and warming up to between 50~55 ℃, add 28.5 parts of urea and 3.8 parts of polyvinyl alcohol for the first time;

[0056] (3) continue to be warmed up to 88~90 ℃, adjust pH value with 10% acetic acid solution to be 5.4, heat preservation reaction 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 reaction to keep the water mixing to 250%;

[0058] (5) adjust pH value to 8.8 with 30% NaOH solution, stop heating, when cooling to 40 ℃, add 7.1 parts of urea for the second time;

[0059] (6) heat preservation reaction for 30 minutes, cooling and discharging.

[0060] Use the prepared MUF resin to prepare the laminate: select wood with a moisture content of less than 15% as the bonding material, apply ...

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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-polycondensation resin adhesive for laminated materials and a preparation method thereof. Background technique [0002] Glulam, also known as glulam, is a wood product that is glued in the direction of thickness, width and length with planks or small squares in parallel to the wood fibers. One of the major engineering wood materials. The preparation of glulam can realize the large use of small wood, the best 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 role in bonding. As an indispensable raw material for wood products, adhesives have always been the key core technology in the production of wood products, and their bonding efficiency and bonding process pe...

Claims

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Application Information

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Patent Type & Authority Applications(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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