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Preparation method of large-particle-size melamino-formaldehyde resin microspheres

A technology of melamine and formaldehyde resin, applied in the field of preparation of large-diameter melamine-formaldehyde resin microspheres, can solve the problems of incapable melamine-formaldehyde resin polymer spheres, poor water solubility of melamine, etc. Effect

Pending Publication Date: 2020-06-19
ANHUI ESTONE MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, melamine, which is the main precursor of melamine-formaldehyde resin polymers, has poor water solubility.
Therefore the classic sol-gel process cannot be used to prepare melamine-formaldehyde resin polymer balls

Method used

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  • Preparation method of large-particle-size melamino-formaldehyde resin microspheres
  • Preparation method of large-particle-size melamino-formaldehyde resin microspheres
  • Preparation method of large-particle-size melamino-formaldehyde resin microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 2.8g of melamine into a 50mL single-necked flask, add 10mL of formaldehyde solution (mass fraction 37%), then add 15mL of deionized water, stir with a magnetic stirrer at a speed of 600r / min, heat to 60°C in a water bath, and continue the reaction for 20min , to obtain a clear prepolymerization solution; add 100mL 4.5g / L polyvinyl alcohol aqueous solution to a 250mL three-necked flask, heat it to 60°C, and adjust its pH to 5.5 with acetic acid solution; add the prepolymerization solution, and quickly adjust it with acetic acid solution The pH value of the system was 4.7, mechanically stirred at 350r / min for 30min, then stopped heating (the reaction solution became turbid), immediately poured the reaction solution into a 500mL beaker, and quickly added 300mL of ice water to cool, stirred to room temperature, and left to stand 12h; after washing three times, centrifuge at a centrifugal speed of 3000r / min, and then place it in a vacuum drying oven to dry for 12h. The p...

Embodiment 2

[0042] Add 2.8g of melamine into a 50mL single-necked flask, add 10mL of formaldehyde solution (mass fraction 37%), then add 15mL of deionized water, stir with a magnetic stirrer at a speed of 600r / min, heat to 60°C in a water bath, and continue the reaction for 20min , to obtain a clear prepolymerization solution; add 100mL 4.5g / L polyvinyl alcohol aqueous solution to a 250mL three-necked flask, heat it to 60°C, and adjust its pH to 5.5 with acetic acid solution; add the prepolymerization solution, and quickly adjust the system with acetic acid The pH value of the solution was 5.2, mechanically stirred at 350r / min for 30min, then stopped heating (the reaction solution became turbid), immediately poured the reaction solution into a 500mL beaker, and quickly added 300mL ice water to cool, stirred to room temperature, and stood for 12h ; After washing three times, centrifuge at a centrifugal speed of 1000r / min, and then place it in a vacuum drying oven to dry for 12h. The partic...

Embodiment 3

[0044] Add 2.8g of melamine into a 50mL single-necked flask, add 10mL of formaldehyde solution (mass fraction 37%), then add 15mL of deionized water, stir with a magnetic stirrer at a speed of 600r / min, heat to 60°C in a water bath, and continue the reaction for 20min , to obtain a clear prepolymerization solution; add 120mL deionized water, 48mL absolute ethanol, and 0.75g polyvinyl alcohol into a 250mL three-neck flask, stir and heat to 60°C, and adjust its pH to 5.5 with acetic acid solution; add the prepolymerization solution, Use acetic acid to quickly adjust the pH of the system to 4.0, mechanically stir at 500r / min for 1h, then stop heating (the reaction solution becomes turbid), immediately pour the reaction solution into a beaker, and quickly add 300mL of ice water to cool, and stir to room temperature , let it stand for 12 hours; after washing three times, it was centrifuged at a centrifugal speed of 5000r / min, and then dried in a vacuum oven for 12 hours. The partic...

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Abstract

The invention discloses a preparation method of large-particle-size melamino-formaldehyde resin microspheres, which relates to the technical field of resin microsphere preparation. The preparation method provided by the invention is simple to operate and short in consumed time, the particle size of the microspheres can be controlled by adjusting the concentration of the prepolymer solution in thereaction medium, the reaction pH, different reaction media and the stirring speed, the particle size can be controlled to be 0.35-9.0 mum, the control range is large, and accurate control can be realized; the resin microspheres have regular spheres, smooth surfaces and large specific surface areas, so that the resin microspheres can be widely applied to a plurality of technical fields. As the final performance of the product depends on the particle size and particle size distribution of the microspheres, the synthesis method of the resin microspheres with narrow particle size distribution andlarge particle size adjustable range provided by the invention has important practical and theoretical significance.

Description

Technical field: [0001] The invention relates to the technical field of preparation of resin microspheres, in particular to a method for preparing large-diameter melamine-formaldehyde resin microspheres. Background technique: [0002] Melamine-formaldehyde resin microspheres are a very important polymer material with a wide range of uses. [0003] Melamine formaldehyde resin microspheres have the following characteristics: (1) small size and volume, small volume can make the microspheres respond quickly when stimulated; (2) large specific surface area, microspheres with larger specific surface area can be better applied In the fields of adsorption, desorption, chemical reaction, light scattering, etc.; (3) High diffusivity and high fluidity, polymer emulsion has low viscosity and high fluidity; (4) Stable dispersion, uniform size and good stability (5) Diversity, through different types of preparation methods, a variety of microspheres in different aspects such as size, sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/32C08J3/12C08L61/28
CPCC08G12/32C08J3/12C08J2361/28
Inventor 刘丽萍蒋学鑫王韶晖郭敬新
Owner ANHUI ESTONE MATERIAL TECH CO LTD