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Method for preparing environmental-friendly urea-formaldehyde resin

A urea-formaldehyde resin, an environment-friendly technology, applied in the field of preparation of environment-friendly urea-formaldehyde resin, can solve environmental hazards, a large amount of waste water and other problems, and achieve the effect of cost reduction and process simplification

Active Publication Date: 2015-07-15
JIANGSU FENGMANG COMPOUND MATERIAL SCI&TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the conventional production process, urea-formaldehyde resin is made by dehydration polycondensation reaction of urea and formaldehyde, and a large amount of waste water will be generated during the production process, which will cause great harm to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of environment-friendly urea-formaldehyde resin, comprising the steps of:

[0026] (1) Feeding

[0027] Put 114 parts by mass of formaldehyde solution with a concentration of 37% into the reaction kettle, add a liquid alkali with a concentration of 30% to adjust the pH to 8.5, then add 10 parts by mass of melamine water resistance enhancer and 42 parts by mass of urea, the enhancer accounts for the total amount of feed The mass fraction of is 0.58%;

[0028] (2) Heating reaction

[0029] Control the temperature in the reactor to rise to 89°C within 45 minutes and keep it warm for 50 minutes;

[0030] (3) Cool down and adjust acidity

[0031] After the heat preservation is over, the temperature in the reactor is lowered to 87°C, and a liquid acid with a concentration of 25% is added to slowly adjust the pH to 4.8;

[0032] (4) Temperature rise and alkali adjustment

[0033] After the acid adjustment is in place, control the temperature in the re...

Embodiment 2

[0039] A preparation method of environment-friendly urea-formaldehyde resin, comprising the steps of:

[0040] (1) Feeding

[0041] Put 122 parts by mass of formaldehyde solution with a concentration of 37% into the reaction kettle, add a liquid alkali with a concentration of 30% to adjust the pH to 9, then add 10 parts by mass of melamine water resistance enhancer and 45 parts by mass of urea, the enhancer accounts for the total amount of feed The mass fraction of is 0.56%;

[0042] (2) Heating reaction

[0043] Control the temperature in the reactor to rise to 93°C within 60 minutes and keep it warm for 30 minutes;

[0044] (3) Cool down and adjust acidity

[0045] After the heat preservation is completed, the temperature in the reactor is lowered to 85°C, and a liquid acid with a concentration of 25% is added to slowly adjust the pH to 5;

[0046] (4) Temperature rise and alkali adjustment

[0047] After the acid adjustment is in place, control the temperature in the r...

Embodiment 3

[0053] A preparation method of environment-friendly urea-formaldehyde resin, comprising the steps of:

[0054] (1) Feeding

[0055] Put 130 parts by mass of formaldehyde solution with a concentration of 37% in the reaction kettle, add a liquid alkali with a concentration of 30% to adjust the pH to 8.8, then add 10 parts by mass of carboxymethylcellulose initial viscosity enhancer and 48 parts by mass of urea to enhance The mass fraction that agent accounts for total charging amount is 0.5%;

[0056] (2) Heating reaction

[0057] Control the temperature in the reactor to 90°C within 70 minutes and keep it warm for 40 minutes;

[0058] (3) Cool down and adjust acidity

[0059] After the heat preservation is over, the temperature in the reactor is lowered to 86°C, and a liquid acid with a concentration of 25% is added to slowly adjust the pH to 5.1;

[0060] (4) Temperature rise and alkali adjustment

[0061] After the acid adjustment is in place, control the temperature in ...

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PUM

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Abstract

The invention discloses a method for preparing environmental-friendly urea-formaldehyde resin. The urea-formaldehyde resin is prepared from urea, formaldehyde and a reinforcing agent through high-temperature reaction under the condition of an appropriate pH value. According to the preparation method disclosed by the invention, vacuum dehydration is not required, the production process is pollution-free, the cost is reduced, and the process is simplified. The performance of the environmental-friendly urea-formaldehyde resin product prepared by the method disclosed by the invention meets requirements, so that the environmental-friendly urea-formaldehyde resin is particularly applicable to the cloth and paper-based treatment of coated abrasive tools.

Description

technical field [0001] The invention relates to a preparation method of an environment-friendly urea-formaldehyde resin, which belongs to the technical field of chemical raw materials. Background technique [0002] Urea-formaldehyde resin is a thermosetting resin obtained by dehydration polycondensation of urea and formaldehyde. Urea-formaldehyde glue is widely used in wood processing, coated abrasives and other industries because of its low price, easy-to-obtain raw materials, high bonding strength, and colorless products. In the conventional production process, urea-formaldehyde resin is obtained by dehydration and polycondensation of urea and formaldehyde, and a large amount of waste water will be generated during the production process, which will cause great harm to the environment. Contents of the invention [0003] The purpose of the present invention is to overcome the disadvantages of the above-mentioned prior art process, and provide a method for preparing an en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/12
Inventor 卢高波关广利冷成
Owner JIANGSU FENGMANG COMPOUND MATERIAL SCI&TECH GRP CO LTD