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Method for preparing thermosetting amino resin microspheres

An amino resin and thermosetting technology, applied in the field of amino resin microsphere particles, can solve the problems of pollution, poor water resistance, difficult to obtain particle size distribution particles, etc., and achieve the effect of good temperature resistance and good solvent resistance.

Inactive Publication Date: 2013-01-30
杭州精彩化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the water resistance of the particles is not good because the obtained particles are polluted by the water-soluble protective colloid as a dispersant
The main problems of the above methods are that water-soluble surfactants are used, resulting in poor water resistance, and inorganic compounds are used, so it is difficult to obtain particles with uniform particle size distribution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 50g melamine, 38.4g paraformaldehyde, 20g silica sol aqueous solution and 700g water in the 1000ml reaction flask that stirring paddle, condenser and thermometer are housed, adjust the pH value of mixture system to 8.5 with 10% sodium carbonate aqueous solution, Raise the temperature to 70°C and stir, and react for 30 minutes to obtain a melamine prepolymer. Continue to keep warm at 70°C, and add 3g of dodecylbenzenesulfonic acid. After 1-5 minutes, a white turbid liquid appears, let stand for 2 hours, raise the temperature to 80°C and keep it for 1 hour, then raise the temperature to 90°C and keep it for 1 hour to ripen the product. The cooled reaction solution was filtered and dried to obtain white solidified resin particles. The particle size is about 1um, and the particle is spherical.

Embodiment 2

[0027] Add 50g melamine, 40g paraformaldehyde, 21g silica sol aqueous solution and 700g water in the 1000ml reaction flask that stirring paddle, condenser and thermometer are housed, adjust the pH value of mixture system to 8.5 with 10% sodium carbonate aqueous solution, heat up to 70°C and stirred, and reacted for 30 minutes to obtain a melamine prepolymer. Continue to keep warm at 70°C, and add 2g of dodecylbenzenesulfonic acid. After 1-5 minutes, a white turbid liquid appears, let stand for 2 hours, raise the temperature to 80°C and keep it for 1 hour, then raise the temperature to 90°C and keep it for 1 hour to ripen the product. The cooled reaction solution was filtered and dried to obtain white solidified resin particles. The particle size is about 1.5um, and the particle is spherical.

Embodiment 3

[0029] Add 40g melamine, 10g benzomelamine, 34.8g paraformaldehyde, 19g silica sol aqueous solution and 700g water in the reaction flask of 1000ml that stirring paddle, condenser and thermometer are housed, adjust the temperature of mixture system with 10% sodium carbonate aqueous solution When the pH value reaches 8.5, the temperature is raised to 70° C. and stirred, and reacted for 60 minutes to obtain a melamine prepolymer. Continue to keep warm at 70°C, and add 2g of dodecylbenzenesulfonic acid. After 1-5 minutes, a white turbid liquid appears, let stand for 2 hours, raise the temperature to 80°C and keep it for 1 hour, then raise the temperature to 90°C and keep it for 1 hour to ripen the product. The cooled reaction solution was filtered and dried to obtain white solidified resin particles. The particle size is about 2.5um, and the particle is spherical.

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PUM

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Abstract

The invention relates to a method for preparing thermosetting amino resin microspheres. The invention aims to provide the method which can prepare amino resin microspheres with wide range of grain size and higher water resistance. The technical scheme I adopted by the invention is that the method for preparing the thermosetting amino resin microspheres comprises the following steps of: (A), adding an amino compound and an aldehyde compound into an aqueous solution of silica sol with an alkaline catalyst to obtain a prepolymer of water soluble amino resin, wherein the weight ratio of the amino compound to the aqueous solution of silica sol is 100: 0.5-100; (B), adding an acidic curing agent into the prepolymer of the water soluble amino resin to obtain amino resin microspheres; and (C), aging the microspheres, filtering, drying and grinding the microspheres to obtain a finished product. The amino compound may be one or more of tripolycyanamide, urea, thiourea, cyanuric acid and phenylated tripolycyanamide, and the aldehyde compound may be one or more of formaldehyde, paraformaldehyde, acetaldehyde, benzaldehyde and furfuraldehyde.

Description

technical field [0001] The invention relates to an amino resin microsphere particle, which is widely used in polishing agents, coatings, inks, smoothing agents, resin fillers, slipping agents, wear-resistant agents, release agents for liquid crystal displays, and light scattering Various materials such as agents. Background technique [0002] Related patents for the production of amino resin microsphere particles have been reported. [0003] US 3945980 provides a method: benzomelamine and formalin are stirred at a certain pH value under the action of a dispersant to obtain an emulsion, and an acidic curing agent is added to obtain spherical amino resin particles. The disadvantage of this method is that the water resistance of the particles is not good because the obtained particles are polluted by the water-soluble protective colloid as a dispersant. US 4069176 provides a method: first emulsify the amino resin prepolymer with a water-soluble dispersant, then add the averag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08J3/12C08L61/28C08K3/36C08G12/32
Inventor 杨少平张宏何建伟
Owner 杭州精彩化工有限公司
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