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Functional curing agent and preparation method thereof

A functional, curing agent technology, applied in the chemical field, can solve the problems of poor bonding durability and slow curing speed, and achieve the effect of improving the curing degree, reducing the proportion of residual acid and excellent durability.

Active Publication Date: 2021-04-13
SOUTHWEST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the problem of slow curing speed of low molar ratio urea-formaldehyde resin is solved, due to a considerable proportion of acid substances remaining in the cured adhesive layer, the final bonding durability of the product is very poor

Method used

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  • Functional curing agent and preparation method thereof
  • Functional curing agent and preparation method thereof
  • Functional curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Under normal temperature conditions, thoroughly mix HPEI-600 polymer and urea (U) according to the mass ratio of 5:4, and use 30% to 35% formic acid solution to adjust the pH value of the mixing system to be between 9.5 and 10 Put it into a reaction vessel with a stirrer, a thermometer, a condensing device and an ammonia absorbing device, raise the temperature to 100°C under mechanical stirring, and keep it warm for 3 hours. After that, stop the reaction and cool to room temperature to obtain the improved The branched polyethyleneimine polymer product after activating is marked as HPEIU-600.

[0037] (2) Under normal temperature conditions, get a certain amount of ammonium chloride solid and configure it as a 25% aqueous solution.

[0038] (3) Under normal temperature conditions, weigh 5 grams of HPEI-1800 polymer and add it to 50 grams of 20% ammonium chloride aqueous solution, stir and mix evenly, then add 30 grams of HPEIU-600, continue to mechanically stir and m...

Embodiment 2

[0041] (1) Under normal temperature conditions, thoroughly mix HPEI-600 polymer and urea (U) according to the mass ratio of 5:4, and use 30% to 35% formic acid solution to adjust the pH value of the mixing system to be between 9.5 and 10 Put it into a reaction vessel with a stirrer, a thermometer, a condensing device and an ammonia absorbing device, raise the temperature to 120°C under mechanical stirring, and keep it warm for 1 hour. After that, stop the reaction and cool to room temperature to obtain the improved The branched polyethyleneimine polymer product after activating is marked as HPEIU-600.

[0042](2) Under normal temperature conditions, get a certain amount of ammonium chloride solid and configure it as a 23% aqueous solution.

[0043] (3) Under normal temperature conditions, weigh 6 grams of HPEI-1800 polymer and add it to 60 grams of 23% ammonium chloride aqueous solution, stir and mix evenly, then add 80 grams of HPEIU-600, continue to mechanically stir and mix...

Embodiment 3

[0046] (1) Under normal temperature conditions, thoroughly mix HPEI-600 polymer and urea (U) at a mass ratio of 5:3, and use 30% to 35% formic acid solution to adjust the pH of the mixing system to a value between 9.5 and 10 Put it into a reaction vessel with a stirrer, a thermometer, a condensing device and an ammonia absorbing device, raise the temperature to 110°C under mechanical stirring, and keep it warm for 2 hours. After that, stop the reaction and cool to room temperature to obtain the improved The branched polyethyleneimine polymer product after activating is marked as HPEIU-600.

[0047] (2) Under normal temperature conditions, get a certain amount of ammonium chloride solid and configure it as a 20% aqueous solution.

[0048] (3) Under normal temperature conditions, weigh 8 grams of HPEI-1800 polymer and add it to 70 grams of 20% ammonium chloride aqueous solution, stir and mix evenly, then add 80 grams of HPEIU-600, continue to mechanically stir and mix evenly.

...

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Abstract

The invention discloses a functional curing agent and a preparation method thereof. The method comprises the following steps: carrying out deamination reaction on a polyethyleneimine polymer with the average molecular weight of 600 and urea for 1-3 hours to prepare a grafted and modified branched polyethyleneimine polymerization product with the code of HPEIU-600; 2, preparing an ammonium compound aqueous solution; and 3, sequentially adding a branched polyethyleneimine polymer with the average molecular mass of 1800 and an HPEIU-600 polymer into the prepared ammonium compound aqueous solution, uniformly mixing to obtain a mixed system, adding an aldehyde substance into the mixed system according to a mass ratio of the aldehyde substance to the mixed system of 6-10%, and continuously and uniformly stirring to obtain the functional curing agent. The curing agent provided by the invention greatly reduces the proportion of residual acid in a cured adhesive layer, and ensures that the adhesive layer has excellent durability.

Description

technical field [0001] The invention relates to the field of chemistry, more specifically, to a functional curing agent and a preparation method thereof. Background technique [0002] At present, resins (or adhesives) for wood processing are mainly a type of prepolymer synthesized by chemical reaction of amino compounds (urea, melamine, etc.) and formaldehyde under certain process conditions, especially urea and formaldehyde. The urea-formaldehyde resin (UF) synthesized from raw materials has a very important position in the field of wood processing, and it is estimated that it accounts for about 90% of the amount of wood adhesives. In order to control the release of formaldehyde and reduce the harm to the human body and the environment, the preparation of urea-formaldehyde resins generally adopts low molar ratio synthesis technology (that is, the molar ratio of formaldehyde to urea is between 0.9 and 1.0), and the release of formaldehyde has been significantly controlled. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J11/08C09J11/04C09J11/06C09J161/24C08G73/02
CPCC09J11/08C09J11/04C09J11/06C09J161/24C08G73/0213C08L79/02C08K3/16C08K5/07
Inventor 王辉杜官本周晓剑曹明
Owner SOUTHWEST FORESTRY UNIVERSITY
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