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Melamine-urea-formaldehyde copolycondensation resin (MUF) wood adhesive and preparing method thereof

A technology of melamine and storage period, which is applied in the direction of aldehyde/ketone condensation polymer adhesives, adhesive types, adhesives, etc., can solve the problems of short storage period and no public reports, etc., and achieve long storage period and excellent performance , the effect of stable performance

Inactive Publication Date: 2014-05-28
SOUTHWEST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the patent application "Melamine-urea-formaldehyde co-condensation resin wood adhesive and preparation method" (publication number CN 101302412A) discloses a kind of MUF resin with high melamine content, the melamine content is as high as more than 40%, but the storage period is shorter
[0007] Through literature search, there is no public report identical with the present invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The adhesive is formed by polycondensation of melamine, urea, formaldehyde, and amino-terminated hyperbranched polymer PAMAM, of which:

[0028] a. Add metered formaldehyde, first urea and a certain amount of water once at the beginning of the reaction, control the molar ratio F / U of formaldehyde and urea to be above 3.0, add a certain amount of amino-terminated hyperbranched polymer PAMAM (the addition is 1-5% of the total solid raw material), adjust the pH value to 10, and gradually raise the temperature to 92-93 °C under stirring;

[0029] b. After incubating and reacting for 30 minutes at 92-93 ℃, adjust the pH value to 5.0 and incubate for 120 minutes;

[0030] c. Adjust the pH value to 9.5, control the temperature at 92-93 °C, add melamine, control the molar ratio F / (U+M) of formaldehyde to urea and melamine at 2.1, and keep warm until the water dilution is 300%;

[0031] d. Maintain the pH value between 9.0-9.5, control the temperature at 92-93 ℃, add urea for...

Embodiment 2

[0034] The adhesive is formed by polycondensation of melamine, urea, formaldehyde, and hyperbranched polymers, of which:

[0035] a. Add metered formaldehyde, first urea and a certain amount of water once at the beginning of the reaction, control the molar ratio F / U of formaldehyde and urea to be above 3.0, add a certain amount of amino-terminated hyperbranched polymer PAMAM (the addition is 1-5% of the total solid raw material), adjust the pH value between 10.2, and gradually raise the temperature to 92-93 ℃ under stirring;

[0036] b. After incubating and reacting for 40 minutes at 92-93 ℃, adjust the pH value between 5.0-5.5 and incubate for 45 minutes;

[0037] c. Adjust the pH value to 9.5, control the temperature at 92-93 °C, add melamine, control the molar ratio F / (U+M) of formaldehyde, urea, and melamine between 2.5, and keep warm until the water dilution is 320 %;

[0038] d. Maintain the pH value between 9-9.5, control the temperature at 92-93 ℃, add urea for the ...

Embodiment 3

[0041] The adhesive is formed by polycondensation of melamine, urea, formaldehyde, and hyperbranched polymers, of which:

[0042] a. Add metered formaldehyde, first urea and a certain amount of water once at the beginning of the reaction, control the molar ratio F / U of formaldehyde to urea above 3.0, add a certain amount of amino-terminated hyperbranched polymer PAMAM (the addition is 1-5% of the total solid raw material), adjust the pH value between 10.0-10.5, and gradually raise the temperature to 92-93 ℃ under stirring;

[0043] b. After incubating and reacting for 30 minutes at 92-93 ℃, adjust the pH value between 5.0-5.5 and incubate for 60 minutes;

[0044] c. Adjust the pH value to 10, control the temperature at 92-93 °C, add melamine, control the molar ratio F / (U+M) of formaldehyde to urea and melamine between 2.1, and keep warm until the water dilution is 350 %;

[0045] d. Maintain the pH value between 9-9.5, control the temperature at 92-93 ℃, add urea for the se...

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PUM

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Abstract

The invention relates to a melamine-urea-formaldehyde copolycondensation resin (MUF) wood adhesive and a preparation method thereof, and belongs to the technical field of wood processing and production. The adhesive is formed through the copolycondensation of melamine (M), urea (U), formaldehyde (F) and amino-terminated hyperbranched polymer PAMAM, and is mainly characterized in that the formaldehyde and melamine are added at one step, urea is added at different times, PAMAM is added at the initial synthesis stage of the MUF resin. The MUF resin related to the invention belongs to resin with high content of melamine, the melamine accounts for 45% above the total amount of urea and melamine, wherein the formaldehyde and urea added for the first time are added at the initial reaction stage at one step, and then the PAMAM is added; after the urea added for the first time is added, the molar ratio of formaldehyde to urea is controlled above 3.0; the melamine is added at the middle and later alkaline stage; urea added for the second time is added at the later reaction stage. The melamine-urea-formaldehyde copolycondensation resin wood adhesive provided by the invention has the remarkable characteristics that the stability and performance are good, more importantly, and the storage period is long (lasting for longer than 5 months), and the adhesive can be applied to production of artificial boards, especially high hydrolytic-resistance artificial boards and laminated wood, and the like.

Description

technical field [0001] The invention relates to a melamine-urea-formaldehyde polycondensation resin (MUF) wood adhesive with a super-long storage period and a preparation method thereof, belonging to the technical field of wood-based panel production in wood processing. Background technique [0002] The wood industry with wood-based panels as the main body is a technological process that is divided first and then combined. The processing process relies on wood adhesives (resins) to complete. Gluing usually determines production efficiency and product quality. Therefore, wood adhesives have always been a milestone in the development of the wood industry. Its synthesis and application are the core and key technologies of the technological progress of the modern wood industry, and have a significant impact on the industry. It can be said that without adhesives and resins, there would be no wood-based panel industry. [0003] At present, the synthetic resins widely used in the ...

Claims

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Application Information

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IPC IPC(8): C08G12/40C09J161/32
Inventor 周晓剑杜官本王辉吴章康李君
Owner SOUTHWEST FORESTRY UNIVERSITY
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