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Synthetic process of novel environment-friendly urea formaldehyde resin

An environmentally friendly urea-formaldehyde resin, a new type of technology, applied in the chemical industry, can solve the problems of low purity pollution, complicated production process, and difficulty in conforming to human beings, and achieve the effect of easy-to-obtain raw materials, convenient and simple preparation, and pure quality

Inactive Publication Date: 2015-01-28
黄厚生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Epoxy resins and alkyd resins can be used to prepare primers and interior paints with different properties, which are widely used. However, in the current industrial production of urea-formaldehyde resins, there are problems such as low yield, low purity and serious pollution. The production process is relatively complicated, and it is difficult to meet the needs of human beings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Novel environment-friendly urea-formaldehyde resin synthetic method comprises the following process steps,

[0018] a. Select a reactor as a reaction vessel.

[0019] b. Weigh 1000kg of formaldehyde into the reactor, turn on the stirrer in the reactor to start stirring, and add 2kg of polyvinyl alcohol into the reactor.

[0020] c. Add 250kg of urea to the reactor in the above step b, and rapidly raise the temperature to 80°C.

[0021] d. After reacting the reaction solution in the above step c at a constant temperature for 50 minutes, add ammonium chloride solution dropwise to the reaction kettle until the pH of the solution in the reaction kettle is 7.5.

[0022] e. When the solution in the above step d is viscous, lower the temperature in the reactor to 40°C.

[0023] f. Turn off the agitator in the reaction kettle, and start discharging after the temperature in the reaction kettle cools down naturally. The milky white mucus released is the finished product of new ...

Embodiment 2

[0025] Novel environment-friendly urea-formaldehyde resin synthesis method is characterized in that: comprising the following process steps,

[0026] a. Select a reactor as a reaction vessel.

[0027] b. Weigh 1000kg of formaldehyde into the reactor, start the stirrer in the reactor to start stirring, and add 3kg of polyvinyl alcohol into the reactor.

[0028] c. Add 300kg of urea to the reactor in the above step b, and rapidly raise the temperature to 90°C.

[0029] d. After reacting the reaction solution in the above step c at a constant temperature for 55 minutes, add ammonium chloride solution dropwise to the reaction kettle until the pH of the solution in the reaction kettle reaches 8.

[0030] e. When the solution in the above step d is viscous, lower the temperature in the reactor to 45°C.

[0031] f. Turn off the agitator in the reaction kettle, and start discharging after the temperature in the reaction kettle cools down naturally. The milky white mucus released is ...

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PUM

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Abstract

The invention discloses a synthetic method of novel environment-friendly urea formaldehyde resin, and relates to the technical field of chemical industry. The synthetic method comprises the steps of selecting a reaction kettle, adding formaldehyde, stirring, adding polyvinyl alcohol, adding urea, carrying out a thermostatic reaction, dropwise adding an ammonium chloride solution into the reaction kettle, neutralizing, cooling, and discharging to obtain the finished product. The synthetic method has the beneficial effects that the synthetic method has the advantages of convenient and simple preparation, environmental protection, no pollution, easy availability of raw materials, less equipment investment, pure quality, and convenient operation; and the prepared urea formaldehyde resin is good in use effect, safe and non-toxic, low in preparation cost, and safe and reliable.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a synthesis method of a novel environment-friendly urea-formaldehyde resin. Background technique [0002] A polymer obtained by reacting urea with formaldehyde. Also known as urea-formaldehyde resin. Cross-linking occurs during processing and molding, and the product is an insoluble and infusible thermosetting resin. The color of cured urea-formaldehyde resin is lighter than that of phenolic resin, and it is translucent. It is resistant to weak acids and alkalis, has good insulation performance, excellent wear resistance, and is cheap. Urea-formaldehyde resin is mainly used to prepare amino alkyd baking varnish with alkyd resin. , to improve the hardness and dryness of the paint film. It can be combined with non-drying alkyd resin to make acid-cured amino paint for wood furniture finishing. Epoxy resins and alkyd resins can be used to prepare primers and interior pa...

Claims

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Application Information

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IPC IPC(8): C08G12/12
Inventor 黄厚生
Owner 黄厚生
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