Self-emulsifying water-borne epoxy resin emulsion and preparation method thereof

A water-based epoxy resin, self-emulsifying technology, applied in the direction of epoxy resin coatings, coatings, etc., can solve the effect of the amount of hydrophilic segment on the curing performance of the emulsion, can not use two-component epoxy coating system, polyoxyalkylene It is easy to popularize, good performance, good acid and alkali resistance, etc.

Active Publication Date: 2012-10-17
CHINA NAT OFFSHORE OIL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, it is disclosed in USA6225376 to utilize dimethylcyclohexylamine to graft polyoxyalkylene polymers on the epoxy resin main chain to form self-emulsifying water-based epoxy resins, but its shortcoming is that alternative polyoxyalkylene polymers not easy to get
Disclosed in CN101838396A is to prepare the water-based epoxy resin emulsion by the epoxy group ring-opening of epoxy resin and on the main chain by the free radical graft polymerization method of acrylic acid ester monomer by two-step reaction respectively, and its shortcoming is that the grafting rate is relatively low. Low, and the prepared water-based epoxy emulsion cannot be used in two-component epoxy coating systems due to the absence of epoxy groups
CN101177479A discloses to utilize the epoxy resin of low molecular weight, adopts two-step method to introduce non-ionic polyether segment respectively on epoxy resin main chain and side chain, thereby realizes the water-based of epoxy resin, and its shortcoming is that can only adopt low The molecular weight liquid epoxy resin is water-based, and the content of the hydrophilic polyether segment is high, and the high amount of the hydrophilic segment will inevitably affect the curing performance of the emulsion

Method used

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  • Self-emulsifying water-borne epoxy resin emulsion and preparation method thereof
  • Self-emulsifying water-borne epoxy resin emulsion and preparation method thereof
  • Self-emulsifying water-borne epoxy resin emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 prepares quaternizing agent A1~A3

[0025] (1) Formula

[0026] The quaternizing agent of the present invention is prepared by reacting polyisocyanate and ethanolamine containing tertiary amino groups under the action of heating and catalyst, and then neutralizing tertiary ammonia with organic acid. The amount of each raw material is calculated by weight percentage: polyisocyanate 40-70%, 15-30% ethanolamine containing tertiary amine groups, 10-20% organic acid, 0-20% co-solvent, 0.045-0.050% catalyst, and the sum of the weight percentages of the above-mentioned raw materials is 100%; , polyisocyanate is one or more of biuret, trimer and trimethylolpropane adduct, ethanolamine containing tertiary amino group is N,N-dimethylethanolamine, N,N-diethyl Any one of base ethanolamine, N,N-diisopropylethanolamine and N,N-dibutylethanolamine, the cosolvent is ethylene glycol esters or propylene glycol esters, the organic acid is lactic acid or glacial acetic acid; ...

Embodiment 2

[0035] Embodiment 2 prepares self-emulsifying type waterborne epoxy resin emulsion R1~R6

[0036] (1) Formula

[0037]Prepare the self-emulsifying type water-based epoxy resin emulsion of the present invention according to the weight percent of each raw material consumption: epoxy resin 40~60%, cosolvent 0~20%, step ① prepares quaternizing agent 5~15%, removes 30-50% of ionized water is used to prepare the raw materials, and the sum of the weight percentages of the above-mentioned raw materials is 100%, and the specific formula is shown in Table 2;

[0038] Table 2

[0039]

[0040]

[0041] Note: ① The numbers in brackets are the amount of each raw material in weight percentage;

[0042] ②The raw materials used in the formula are not limited by Table 2, and can be selected from the varieties listed above.

[0043] (2) Preparation

[0044] In a 1000ml four-necked flask equipped with a thermometer, a stirring device and a condensing device, add epoxy resin or epoxy re...

Embodiment 3

[0050] Embodiment 3 prepares two-component waterborne epoxy paint

[0051] (1) Preparation of two-component waterborne epoxy coatings

[0052] The self-emulsifying type water-based epoxy resin emulsion R1, R2, R3 prepared in Example 2 is the basic film-forming resin, with Anquamine701 as the curing agent (product of Gas Chemical Company), according to the epoxy group in the emulsion and the mole of active hydrogen in the curing agent The ratio is 1:0.8 to calculate the amount of the two, according to the existing two-component water-based epoxy coating common formula, add defoamer, leveling agent, anti-rust pigments and fillers, etc., and prepare two-component dry at room temperature according to the existing method Waterborne epoxy paint T1, T2, T3.

[0053] (2) Testing the performance of the coating film

[0054] ①Preparation of samples for testing

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Abstract

The invention relates to self-emulsifying water-borne epoxy resin emulsion and a preparation method thereof. The emulsion is formed by heating epoxy resin and a quaterisation agent to obtain a reaction product, adding water to carry out self-emulsifying, and adjusting until the solid content is 50-55 wt% for forming the emulsion, wherein the amounts of raw materials are as follows: 40-60% of epoxy resin, 0-20% of cosolvent, 5-15% of the quaterisation agent and 35-50% of deionized water; the quaterisation agent is obtained by reacting polyisocyanate and ethanolamine comprising tert-amino groupunder the actions of heating and a catalyst, and then neutralizing tert-ammonia through organic acid, and the amounts of raw materials are as follows: 40-70% of polyisocyanate, 15-30% of ethanolaminecomprising the tert-amino group, 10-20% of organic acid, 0-20% of cosolvent and 0.045-0.050% of catalyst. The preparation method has the advantages of convenience, simpleness and excellent emulsion stability, and can be cooperated with a commercial water-borne epoxy amine curing agent to prepare a water-borne dual-component epoxy coating with excellent comprehensive performance.

Description

technical field [0001] The invention relates to a self-emulsifying water-based epoxy resin emulsion and a preparation method thereof. Background technique [0002] Epoxy resin has excellent physical and mechanical properties, and can be widely used in various fields as adhesives, composite material substrates and packaging materials, especially in the field of coatings, but most commonly used epoxy resins are viscous Liquid or solid, insoluble in water, easily soluble in ketones and alcohol ether organic solvents. With the increasing environmental protection, it is of great practical significance to develop and research waterborne epoxy resin systems suitable for coatings. At present, the common water-based methods of epoxy resin mainly include external emulsification and self-emulsification. The external emulsification method uses an external surfactant to emulsify the epoxy resin under high shear force to obtain a water-based epoxy resin emulsion. This method has higher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08G59/14C08L63/00C09D163/00
Inventor 张汉青胡中陈卫东祝宝英庄振宇朱柯许飞於杰
Owner CHINA NAT OFFSHORE OIL CORP
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