Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of self-emulsifying nonionic waterborne epoxy resin emulsion and preparation method thereof

A water-based epoxy resin and phenolic epoxy resin technology, which can be used in coatings and other directions, can solve the problems of environmental pollution, high corrosiveness, and difficulty in obtaining polyoxyalkylene polymers, so as to improve corrosion resistance and scratch resistance. It has the advantages of good damage performance, good water resistance and alkali resistance, and simple and efficient synthesis method.

Inactive Publication Date: 2016-01-06
WUHAN INSTITUTE OF TECHNOLOGY
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] "JApplePolymSci" [2002,83(8):1736-1743] is grafted into epoxy resin molecules by acrylic acid, and then neutralized with acetic acid to form a salt to prepare self-emulsifying epoxy resin, but the presence of organic acids will lead to coating film properties Decrease, it is easy to produce flash rust when used on metal, and organic solvents are used in the reaction process. If the solvent is not removed after the reaction, there will still be environmental pollution.
U.S. Patent No. 6,225,376 discloses a method of introducing polyoxyalkylene into the main chain of epoxy resin through dimethylcyclohexylamine to form a self-emulsifying epoxy resin. The disadvantage is that it is not easy to obtain suitable polyoxyalkylene polymerization in China. thing
U.S. Patent 6143809 uses concentrated HNO3 to oxidize the hydroxyl group in polyethylene glycol monomethyl ether to carboxyl group, and then reacts with bisphenol A epoxy resin to partially esterify to form a self-emulsifying water-based epoxy resin. The disadvantage of this invention is that the process is complicated, it needs concentrated HNO3 for oxidation, and it is highly corrosive
Chinese invention patent CN101899163B discloses a preparation method of self-emulsifying non-ionic water-based phenolic epoxy resin emulsion: first react polyethylene glycol monomethyl ether with organic dibasic carboxylic acid anhydride in equimolar ratios to synthesize polyethylene glycol with carboxyl groups at the end Alcohol monomethyl ether monoester, and then react with novolac epoxy resin to synthesize self-emulsifying nonionic water-based novolac epoxy resin. This invention uses the hydroxyl group in polyethylene glycol monomethyl ether to react with organic acid anhydride to transform it It is a polyethylene glycol monomethyl ether with a terminal carboxyl group, and then uses the reactivity of the terminal carboxyl group and epoxy group in the molecule to introduce a non-ionic hydrophilic segment into the epoxy resin, making it into a self-emulsifying non-ionic Type water-based epoxy resin, its disadvantage is that the preparation steps are relatively complicated, the reaction is carried out in two steps, and the molecule contains ester bonds, which have a certain impact on the alkali resistance of the resin

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of self-emulsifying nonionic waterborne epoxy resin emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A self-emulsifying nonionic water-based epoxy resin emulsion, which is prepared by the following steps:

[0040] 1) Synthesis of self-emulsifying nonionic waterborne epoxy resin

[0041] Add 100g of F-51 type epoxy resin and 120g of polyethylene glycol monomethyl ether (relative molecular mass: 2000) into a four-neck flask with reflux condenser, water separator, thermometer and nitrogen conduit respectively, and then add 70g of toluene , heated, and after the reaction mixture melted, the system was heated to 140°C, and after water was separated for 3 hours under magnetic stirring, the heating was stopped to obtain a mixed liquid;

[0042]After the temperature of the above system drops to 80°C, keep the constant temperature, add 0.11g of boron trifluoride etherate complex (dissolved and diluted with 10mL toluene in advance) while stirring, and carry out the reaction under the protection of nitrogen, every 30min during the reaction process Take a sample (0.5~1.0g) to ana...

Embodiment 2

[0064] A self-emulsifying nonionic water-based epoxy resin emulsion, which is prepared by the following steps:

[0065] 1) Synthesis of self-emulsifying nonionic waterborne epoxy resin

[0066] Add 100g of F-51 type epoxy resin and 120g of polyethylene glycol monomethyl ether (relative molecular weight is 4000) into a four-necked flask with reflux condenser, water separator, thermometer and nitrogen conduit respectively, and then add 80g of toluene , heating, after the reaction mixture is melted, the temperature of the system is raised to 140°C, and after water separation for 3 hours under magnetic stirring, stop heating;

[0067] After the temperature of the above system drops to 80°C, keep the constant temperature, add 0.12g of boron trifluoride etherate complex (pre-diluted with 10mL toluene) while stirring, and carry out the reaction under the protection of nitrogen, and take samples every 30min during the reaction ( 0.5~1.0g) to analyze the epoxy value of the system, whe...

Embodiment 3

[0081] A self-emulsifying nonionic water-based epoxy resin emulsion, which is prepared by the following steps:

[0082] 1) Synthesis of self-emulsifying nonionic waterborne epoxy resin

[0083] Add 100g F-48 type epoxy resin and 100g polyethylene glycol monomethyl ether (relative molecular weight is 3000) respectively in the four-necked flask with reflux condenser, water separator, thermometer and nitrogen conduit, then add 70g toluene, Heating, after the reaction mixture melts, raise the temperature of the system to 140°C, and stop heating after water separation for 3 hours under magnetic stirring;

[0084] After the temperature of the above system drops to 90°C, keep the constant temperature, add 0.15g triphenylphosphine (dissolved and diluted with 10mL toluene in advance) while stirring, and carry out the reaction under the protection of nitrogen, and take samples every 30min during the reaction process (0.5~1.0g ) to analyze the epoxy value of the system, when the epoxy v...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a self-emulsifying nonionic epoxy resin emulsion and a preparation method thereof, comprising the following steps: 1) dissolving phenolic epoxy resin and polyethylene glycol monomethyl ether in toluene, and azeotropically dehydrating the mixed liquid Finally, the mixed liquid is prepared for use; 2) Dissolving the catalyst in toluene to make a toluene solution of the catalyst, under the protection of nitrogen, add the toluene solution of the catalyst dropwise to the mixed liquid of 1), when the epoxy group of the reaction liquid When the retention rate is basically unchanged, add water and stir for a period of time to stop the reaction; 3) Distill toluene and water under reduced pressure to obtain non-ionic water-based epoxy resin; 4) Under strong stirring, drop a certain amount of co-solvent and distilled water to prepare A water-based epoxy resin emulsion with a solid content of 35wt% to 45wt%. The water-based epoxy resin emulsion obtained by the invention has good stability and non-toxicity; the operation steps are simple, and the prepared water-based paint has the characteristics of flexibility and good water resistance.

Description

technical field [0001] The invention relates to a self-emulsifying non-ionic water-based epoxy resin emulsion and a preparation method thereof. The emulsion can be used as a basic raw material for preparing water-based epoxy coatings. Background technique [0002] Epoxy resin has the characteristics of high hardness, good wear resistance, high adhesion and excellent chemical resistance, and can be widely used as wood coatings, industrial floor coatings, anti-corrosion coatings, adhesives and inks. With the improvement of the quality of life, people's environmental protection requirements for coatings are becoming more and more stringent, so the traditional solvent-based epoxy resin can no longer meet people's pursuit. In recent years, water-based epoxy resins that use water as a dispersion medium have become more and more popular. [0003] Water-based epoxy resin refers to a type of coating that does not contain organic solvents or has very low content, saves energy, has no...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/00C08G59/14C09D187/00C09D163/04
Inventor 官仕龙陈协胡登华向鹏飞张静静
Owner WUHAN INSTITUTE OF TECHNOLOGY