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Preparation method of fluorine modified epoxy phosphate water dispersion

A technology of epoxy phosphate ester and fluorine modification, which is applied in the direction of epoxy resin coating, plastic/resin/wax insulator, coating, etc. It can solve the problem that the heat resistance and insulation performance of polymer corrosion-resistant coating cannot meet the use requirements, etc. problems, to achieve the effect of improving mechanical properties, heat resistance and corrosion resistance, good manufacturability, and good thermal stability

Active Publication Date: 2018-11-30
BEIJING JINHWEILI APPLIED CHEM PROD +1
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  • Abstract
  • Description
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Problems solved by technology

[0003] In view of this, the present invention proposes a method for preparing a fluorine-modified epoxy phosphate aqueous dispersion and a water-based baking varnish for magnet materials prepared from the epoxy phosphate aqueous dispersion obtained by this method, aiming at solving the problem of existing rare earth permanent magnets. The heat resistance and insulation properties of polymer corrosion-resistant coatings used in magnetic materials cannot meet the growing demand for use

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  • Preparation method of fluorine modified epoxy phosphate water dispersion
  • Preparation method of fluorine modified epoxy phosphate water dispersion

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[0024] The first aspect of the present invention provides a kind of preparation method of fluorine-modified epoxy phosphate aqueous dispersion, and this method comprises the following steps:

[0025] (1) Oxazolidinization: put 200-425 parts of epoxy resin, 8-25 parts of small molecule alcohols and 0.1-0.5 parts of the first catalyst into the reaction vessel, mix, stir and heat to 30-70°C , add 35-160 parts of isocyanate and keep it warm at 35-75°C for 0.5-3 hours, slowly heat up to 100-130°C, add 0.3-0.5 parts of the second catalyst to react at 110-135°C to the epoxy resin of epoxy resin The equivalent is 252-340. Preferably, the temperature for the first heating is 40-45°C, the temperature for heat preservation is 40-65°C, the time for heat preservation is 1-2 hours, and the temperature for the second heating is 115-125°C. After adding the second catalyst The reaction temperature is 115-130° C., and the epoxy equivalent of the epoxy resin is 310-330 at 115-130° C.

[0026] ...

Embodiment 1

[0048] (1) Take 301g of epoxy resin E51, 9g of methanol, and 0.2g of dibutyltin dilaurate into a reaction vessel, mix, stir and heat to 30°C, then add 130g of modified diphenylmethane diisocyanate of Desmodur E22 Keep warm at 35°C for 0.5-1 hour, slowly heat up to 100°C, add 0.35g of triphenylphosphine and react at 110°C until the epoxy equivalent of the epoxy resin is 320-330;

[0049] (2) Add 30g of ethylene glycol monobutyl ether and cool down to 75°C, add 95g of bisphenol A, 35g of bisphenol AF and 0.35g of triphenylphosphine, raise the temperature to 140°C under stirring, and react to the temperature of the epoxy resin The epoxy equivalent is 1900-2000;

[0050] (3) Add 190g of ethylene glycol monobutyl ether and cool down to 50°C, then add 35g of phosphoric acid, heat up to 90°C, keep warm for 2-3 hours, then cool down to 55°C, add 63g of N,N-dimethylethanolamine (DMEA) And stir evenly, slowly add 1090g of deionized water at 50-60°C dropwise, and emulsify to obtain a fl...

Embodiment 2

[0054] (1) Take 364g of epoxy resin E51, 11g of ethanol, and 0.21g of monobutyltin oxide in a reaction vessel, mix, stir and heat to 30°C, then add 158g of modified diphenylmethane diisocyanate of Desmodur E22 Keep warm at 36°C for 0.5-1 hour, slowly heat up to 110°C, add 0.42g of N,N-dimethylbenzylamine and react at 115°C until the epoxy equivalent of the epoxy resin is 318-328;

[0055] (2) Add 56g of ethylene glycol monobutyl ether and cool down to 80°C, add 44g of bisphenol A, 133g of bisphenol AF and 0.42g of N,N-dimethylbenzylamine, raise the temperature to 135°C under stirring, and react The epoxy equivalent to epoxy resin is 1550-1650;

[0056] (3) Add 185g of ethylene glycol monobutyl ether and cool down to 55°C, then add 51g of phosphoric acid, heat up to 102°C, keep warm for 2-3 hours, then cool down to 60°C, add 78g of N,N-dimethylethanolamine (DMEA) And stir evenly, slowly add 1200g of deionized water at 60-70°C dropwise, and emulsify to obtain a fluorine-modifie...

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Abstract

The invention provides a preparation method of a fluorine modified epoxy phosphate water dispersion. The preparation method comprises following steps: 1, epoxy resin, a small molecular alcohol, a first catalyst, and an alcohol ether solvent are introduced into a reaction container for mixing heating, isocyanate is added, an obtained mixture is heated slowly, a second catalyst is added for reactionuntil the epoxide equivalent of the epoxy resin ranges from 252 to 340; 2, the alcohol ether solvent is added for cooling, bisphenol A, hydrogenated bisphenol A, bisphenol AF, and the second catalystare added, the temperature is increased to 140 to 160 DEG C with stirring, reaction is carried out until the epoxide equivalent of the epoxy resin ranges from 1300 to 2400; 3, the alcohol ether solvent is added, the temperature is reduced to 50 to 65 DEG C, phosphoric acid is added, the temperature is increased to 90 to 135 DEG C so as to obtain an epoxy phosphate; and 4, cooling is carried out,an amine neutralizer is added, uniform stirring is carried out, deionized water is added slowly, and emulsification is carried out. The properties, especially heat resistance, corrosion resistance, and insulation performance, of the obtained aqueous baking varnish are capable of reaching the level of the same kind solvent type epoxy baking varnish, and VOC emission amount is reduced at the same time, and environment protection performance is improved.

Description

technical field [0001] The invention relates to the technical field of water-based coatings, in particular to a preparation method of a fluorine-modified epoxy phosphate aqueous dispersion. Background technique [0002] At present, the polymer corrosion-resistant coatings used in rare earth permanent magnet materials cannot meet the growing demand for heat resistance and insulation. Due to factors such as non-toxic organic solvents and the risk of explosion, it is necessary to develop a heat-resistant and corrosion-resistant water-based baking varnish that uses water as a diluent with good insulation effect and is suitable for coating rare earth permanent magnet materials. Contents of the invention [0003] In view of this, the present invention proposes a method for preparing a fluorine-modified epoxy phosphate aqueous dispersion and a water-based baking varnish for magnet materials prepared from the epoxy phosphate aqueous dispersion obtained by this method, aiming at so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/08C09D5/18C09D5/25C09D7/65C08G59/14
CPCC08G59/1422C08G59/1438C08G59/1477C08G59/1494C08G2150/90C08L2201/02C08L2201/08C08L2205/05C08L2312/00C09D5/08C09D5/18C09D163/00H01B3/40C08L61/14C08K3/24
Inventor 秦文梁奕方秀莲饶晓雷
Owner BEIJING JINHWEILI APPLIED CHEM PROD
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