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 level

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
Comparison scheme
Effect test

Example Embodiment

[0037] Example 1:

[0038] (1) Synthesis of prepolymer: Take 9.5g formaldehyde (37%, mass fraction), 3.3g melamine and 14.0g deionized water in an Erlenmeyer flask, and adjust the pH with sodium bicarbonate solution (10%, mass fraction) To 11.5, and stir the reaction at 65°C for about 15 minutes, the solution becomes clear, and the melamine formaldehyde prepolymer is obtained.

[0039] (2) Construction of the microbubble system: add 95g of polyvinyl alcohol aqueous solution (PVA1795, 4%, mass fraction) and 1.1g of aniline into the reaction vessel, blow in air at 65°C to make the pressure reach 0.8MPa, and keep it for 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 0.33g of glycine to the microbubble solution of step two, use a dropper to add the melamine formaldehyde prepolymer to the microbubble...

Example Embodiment

[0041] Example 2:

[0042] (1) Synthesis of prepolymer: Take 8.2g formaldehyde (37%, mass fraction), 3.8g melamine, and 12.5g deionized water in an Erlenmeyer flask, and adjust the pH to it with sodium carbonate solution (15%, mass fraction) 10.5, and the reaction was stirred at 60°C for about 18 minutes, the solution became clear, and the melamine formaldehyde prepolymer was obtained.

[0043] (2) Construction of the microbubble system: Add 86g polyethylene glycol aqueous solution (averageMn4000, 4%, mass fraction) and 1.5g toluidine into the reaction vessel, pass carbon dioxide gas at 60℃ to make the pressure reach 0.7MPa, and keep it After 15 minutes, the valve was opened and the pressure was reduced to 0.1MPa. A large number of microbubbles were generated in the solution to build a microbubble system.

[0044] (3) Preparation of hollow microspheres: add 0.5 g of alanine to the microbubble solution of step two, use a dropper to add the melamine formaldehyde prepolymer to the micr...

Example Embodiment

[0045] Example 3:

[0046] (1) Synthesis of prepolymer: Take 8.3g formaldehyde (37%, mass fraction), 3.5g melamine and 10.0g deionized water in a conical flask, adjust the pH to 11.0 with ammonia (10%, mass fraction), After stirring and reacting at 65°C for about 16 minutes, the solution became clear and the 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, pass 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 to build a microbubble system.

[0048] (3) Preparation of hollow microspheres: Add 0.28g of valine to the microbubble solution of step 2, and use a dropper to add the melamine formaldehyde prepolymer to the microbubble solution drop by drop, stir and react at 70°C...

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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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