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A kind of high-performance environment-friendly urea-formaldehyde resin adhesive and preparation method thereof

A urea-formaldehyde resin glue, an environment-friendly technology, applied in the directions of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of high cost, no public report, and increase of the preparation cost of urea-formaldehyde resin, etc., Achieve the effect of low cost, low free formaldehyde content, stable and easy control of the reaction process

Active Publication Date: 2018-05-29
SOUTHWEST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (3) The above 3 inventions have all used melamine with higher cost, which will increase the preparation cost of urea-formaldehyde resin
[0010] Through document comparison, do not see the public report identical with the present invention

Method used

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Examples

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Effect test

preparation example Construction

[0029] A kind of preparation method of high-performance environment-friendly type urea-formaldehyde resin adhesive of the present invention, the specific steps of described method are as follows:

[0030] (1) Add 60-90 parts of high-concentration formaldehyde emulsion into the reaction kettle, and adjust the pH value to 8.0-8.5 with alkaline solution;

[0031] (2) Under stirring conditions, add urea and soybean protein for the first time, and heat up to 88-92°C;

[0032] (3) Add urea for the second time, keep warm for 20-60 minutes, and adjust the pH value to 5.0-5.3 with acid solution;

[0033] (4) React until the water miscibility is 250-300%, cool down to 60°C, and adjust the pH value to 7.5-8.0 with alkaline solution;

[0034] (5) Add urea for the third time, keep warm for 10-30 minutes, and then cool and discharge.

[0035] Specifically, in step (2), the first addition of urea accounts for 35 to 50 wt% of the total urea addition; in step (2), the soybean protein raw mat...

Embodiment 1

[0037] (1) Add 75 parts of 50wt% high-concentration formaldehyde emulsion into the reaction kettle, and adjust the pH value to 8.5 with 30% NaOH aqueous solution;

[0038] (2) Under stirring conditions, add 30 parts of urea and 3.75 parts of soy protein for the first time, and heat up to 90°C;

[0039] (3) Add 25 parts of urea for the second time, keep warm for 30 minutes, and adjust the pH value to 5.0 with 10% formic acid solution;

[0040] (4) react until the water miscibility is 300%, lower the temperature to 60°C, and adjust the pH value to 8.0 with alkaline solution;

[0041] (5) Add 20 parts of urea for the third time, heat-preserve and react for 20 minutes, cool and discharge to obtain urea-formaldehyde resin (UF2).

[0042] Three-ply poplar plywood was prepared using the above urea-formaldehyde resins. Control the double-sided sizing amount to 220g / m 2 Apply glue to the veneer, level it, put it in the open for 20 minutes, and then hot press it. The hot pressing pr...

Embodiment 2

[0046] (1) 75 parts of 50wt% high-concentration formaldehyde aqueous solution are added in the reaction kettle, and the pH value is adjusted to 8.5 with 30% NaOH aqueous solution;

[0047] (2) Under stirring conditions, add 43 parts of urea and 7.5 parts of soy protein for the first time, and heat up to 90°C;

[0048] (3) Add 23 parts of urea for the second time, keep warm for 30 minutes, and adjust the pH value to 5.0 with 10% formic acid solution;

[0049] (4) react until the water miscibility is 250%, lower the temperature to 60°C, and adjust the pH value to 8.5 with alkaline solution;

[0050] (5) Add 20 parts of urea for the third time, heat the reaction for 30 minutes, cool and discharge, and obtain urea-formaldehyde resin (UF2).

[0051] Three-ply poplar plywood was prepared using the above urea-formaldehyde resins. Control the double-sided sizing amount to 220g / m 2 Apply glue to the veneer, level it, put it in the open for 20 minutes, and then hot press it. The hot...

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Abstract

The present invention discloses a high-performance environment-friendly urea-formaldehyde resin adhesive and a preparation method thereof, high-concentration formaldehyde is used for replacing a traditional 37% formaldehyde solution for preparing low the molar ratio urea-formaldehyde resin with the molar ratio of formaldehyde to urea of 0.8 to 1.1, and meanwhile, during the preparation of the resin, soy protein is added for preparing environment-friendly urea-formaldehyde resin. The high-performance environment-friendly urea-formaldehyde resin adhesive is simple in preparation process, the reaction process is stable and easy to control, and the resin has the advantages of low cost, low free formaldehyde content and high bonding strength, and the like, and is suitable for artificial board production and furniture manufacturing.

Description

technical field [0001] The invention relates to a wood adhesive preparation technology, in particular to a high-performance environment-friendly urea-formaldehyde resin adhesive and a preparation method thereof. Background technique [0002] Urea-formaldehyde resin adhesive (UF) is a thermosetting polymer synthetic resin that was developed and applied earlier. It is widely used in particleboard, plywood, and medium-density fiberboard in the wood industry, accounting for more than 90% of the amount of wood-based panels. It is an adhesive The most widely used species. The reason why UF can be used in large quantities is that its manufacturing process is simple, its raw materials are cheap and easy to obtain, its initial viscosity is large, and its bonding strength is high. But at the same time, UF also has some problems, such as poor water resistance, high brittleness, poor aging resistance, short storage period, high content of free formaldehyde, etc., which seriously affect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/32C08G12/40
CPCC08G12/40C09J161/32
Inventor 王辉吴志刚雷洪杜官本
Owner SOUTHWEST FORESTRY UNIVERSITY
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