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Preparation method and application of hollow melamine formaldehyde resin microspheres

A melamine and formaldehyde resin technology, applied in the preparation of microspheres, microcapsule preparations, etc., can solve the problems of poor mechanical strength and leveling ability, increase in resin viscosity, decrease in polishing resistance, etc., to achieve high dispersion and reduce energy loss. , the effect of improving utilization efficiency

Inactive Publication Date: 2015-12-16
NANJING INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of silica will cause problems such as increased coating brittleness, decreased polishing resistance, increased resin viscosity, and poor mechanical strength and leveling ability.
According to the query results, there are almost no reports on the preparation, characterization and application of hollow melamine-formaldehyde resin microspheres

Method used

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  • Preparation method and application of hollow melamine formaldehyde resin microspheres
  • Preparation method and application of hollow melamine formaldehyde resin microspheres
  • Preparation method and application of hollow melamine formaldehyde resin microspheres

Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) Synthesis of prepolymer: get 9.5g formaldehyde (37%, mass fraction), 3.3g melamine and 14.0g deionized water in conical flask, adjust pH with sodium bicarbonate solution (10%, mass fraction) to 11.5, and stirred at 65°C for about 15 minutes, the solution became clear, and a melamine formaldehyde prepolymer was obtained.

[0039] (2) Construction of microbubble system: 95g polyvinyl alcohol aqueous solution (PVA1795, 4%, mass fraction) and 1.1g aniline are added in the reaction vessel, feed air under 65 ℃ to make the pressure reach 0.8MPa, and maintain 10 minutes, Then the valve is opened, the pressure is reduced to normal pressure, a large number of microbubbles are generated in the solution, and a microbubble system is constructed.

[0040] (3) Preparation of hollow microspheres: Add 0.33 g of glycine to the microbubble solution in step 2, add the melamine formaldehyde prepolymer dropwise into the microbubble solution with a dropper, stir and react at 65°C for 15 m...

Embodiment 2

[0042] (1) Synthesis of prepolymer: get 8.2g formaldehyde (37%, mass fraction), 3.8g melamine and 12.5g deionized water in conical flask, adjust pH to 10.5, and stirred at 60°C for about 18 minutes, the solution became clear, and a melamine formaldehyde prepolymer was obtained.

[0043] (2) Construction of the microbubble system: 86g polyethylene glycol aqueous solution (averageMn4000, 4%, mass fraction) and 1.5g toluidine are added in the reaction vessel, feed carbon dioxide gas under 60 ℃ to make the pressure reach 0.7MPa, and keep After 15 minutes, the valve is opened, the pressure is reduced to 0.1MPa, a large number of microbubbles are generated in the solution, and a microbubble system is constructed.

[0044] (3) Preparation of hollow microspheres: add 0.5 g of alanine to the microbubble solution in step 2, add the melamine-formaldehyde prepolymer dropwise into the microbubble solution with a dropper, and stir and react at 60° C. for 20 minutes. Sodium carbonate soluti...

Embodiment 3

[0046] (1) Synthesis of prepolymer: get 8.3g formaldehyde (37%, mass fraction), 3.5g melamine and 10.0g deionized water in conical flask, adjust pH to 11.0 with ammoniacal liquor (10%, mass fraction), And stirred and reacted at 65°C for about 16 minutes, the solution became clear, and a melamine formaldehyde prepolymer was obtained.

[0047] (2) Construction of the microbubble system: Add 92g of sodium polyacrylate aqueous solution and 1.3g of chloroaniline into the reaction vessel, feed sulfur hexafluoride gas at 70°C to make the pressure reach 0.7MPa, and keep it for 30 minutes, then open the valve, When the pressure is reduced to 0.3MPa, a large number of microbubbles are generated in the solution, and a microbubble system is constructed.

[0048] (3) Preparation of hollow microspheres: add 0.28 g of valine to the microbubble solution in step 2, add the melamine-formaldehyde prepolymer dropwise into the microbubble solution with a dropper, and stir and react for 10 minutes ...

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Abstract

The invention discloses a preparation method and application of hollow melamine formaldehyde resin microspheres. By using the relation between the solubility and pressure of gas, bubbles are dispersed by the aid of pressurization and depressurization to construct a microbubble system; and under the guide action of the guide agent and the modification action of the anionizing agent, the melamine formaldehyde prepolymer is coated on the microbubble surface, thereby obtaining the hollow melamine formaldehyde resin microspheres. By using the microbubbles as the template, the method omits the process of decomposing / evaporating the liquid or solid core, and thus, has the advantages of simple technique and energy saving. The method successfully synthesizes the hollow melamine formaldehyde resin microspheres which have the advantages of uniform particle size and high dispersity. The method has universal instruction meanings for the hollow microspheres which can not be prepared by the traditional process. The hollow melamine formaldehyde resin microspheres have wide application and development prospects in the fields of paint matting, metal corrosion resistance, material lightweight design and impact strength improvement, slow release of drugs, bioactivity, catalysis, sound insulation, heat insulation and the like.

Description

technical field [0001] The invention relates to a method for preparing hollow melamine-formaldehyde resin microspheres and its application. The hollow melamine-formaldehyde resin microspheres are mainly used in the fields of paint matting, metal anticorrosion, and material lightweight design, and can also be used for drug sustained release and biological activity. And catalysis and sound insulation and heat insulation and other fields. Background technique [0002] Matt paint has the characteristics of low gloss and soft appearance, which not only gives people a noble, elegant, gentle and peaceful feeling, but also helps protect eyesight, so it is very popular and widely used. Matte coatings must be added with matting additives during the preparation process, only in this way can the matte effect be obtained. [0003] The matting agent commonly used in industry is silica matting agent. The use of silica will cause problems such as increased coating brittleness, decreased p...

Claims

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Application Information

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IPC IPC(8): C08G12/40C08G12/32C08G73/02C08J9/02B01J13/14
Inventor 杭祖圣黄玉安怀旭孙旭鹏肖泽崇王章忠唐印蒋文茂
Owner NANJING INST OF TECH
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