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Paint crosslinking agent for waterborne epoxy resin
2017-8-14 18:22:07
Paint crosslinking agent for waterborne epoxy resin
According to the different preparation methods, the preparation methods of waterborne epoxy resin mainly include mechanical method, reverse rotating method, water-based epoxy resin and chemical modification method.
1. Mechanical method, also known as direct emulsification method, is usually a epoxy resin with ball mill, the colloid mill, homogenizer, such as grinding, and adding emulsifier aqueous solution, by ultrasonic oscillation, high speed stirring scatter particles in the water, or a mixture of epoxy resin and emulsifier, heated to a certain temperature, under the intense mixing gradually add water to form epoxy resin emulsion. The advantages of mechanical preparation of water-based epoxy resin emulsion are simple process, low cost and low dosage of emulsifier.
However, this method in the preparation of emulsion epoxy resin dispersed phase particle size is larger, about 10 microns, irregular particle shape, particle size distribution is wide, the worthy of emulsion stability generally poor, and the film forming properties of the emulsion are also not so good, but due to the presence of nonionic surfactant, will affect the appearance of the coating and some performance.
2. On the contrary to turn method by changing the volume of water phase, the polymer from water-in-oil (w/o) state into oil-in-water (o/w) state, is a more effective method of preparation of polymer resin emulsion can be almost all the high polymer resin by means of additional emulsifier role through the corresponding physical emulsification method, the emulsion.
Contrary to the original refers to the continuous phase in the multicomponent system under certain conditions, the process of mutual transformation between such as in oil/water/emulsifier system, when the continuous phase from the aqueous phase oil or water from the oil phase shift, the continuous phase transition zone, the system of the minimum interfacial tension, so at this time the size of the dispersed phase is minimal.
The emulsion of polymer resin was emulsified by means of the opposite method, the size of the emulsion was smaller than the mechanical method, and the stability was better than the mechanical method. The average particle size of the dispersed phase was l ~ 2 mu m.
3. Waterborne epoxy resin is not emulsified with crosslinking agent, but emulsified epoxy resin by using crosslinking agent with a water-based epoxy resin with emulsifying effect. This kind of cross-linking agent with emulsifying properties is generally modified epoxy resin crosslinking agent, which has the function of both crosslinking and emulsifying low molecular weight of liquid epoxy resin.
Chinese name: Diethyl toluene diamine(DETDA)
According to the different preparation methods, the preparation methods of waterborne epoxy resin mainly include mechanical method, reverse rotating method, water-based epoxy resin and chemical modification method.
1. Mechanical method, also known as direct emulsification method, is usually a epoxy resin with ball mill, the colloid mill, homogenizer, such as grinding, and adding emulsifier aqueous solution, by ultrasonic oscillation, high speed stirring scatter particles in the water, or a mixture of epoxy resin and emulsifier, heated to a certain temperature, under the intense mixing gradually add water to form epoxy resin emulsion. The advantages of mechanical preparation of water-based epoxy resin emulsion are simple process, low cost and low dosage of emulsifier.
However, this method in the preparation of emulsion epoxy resin dispersed phase particle size is larger, about 10 microns, irregular particle shape, particle size distribution is wide, the worthy of emulsion stability generally poor, and the film forming properties of the emulsion are also not so good, but due to the presence of nonionic surfactant, will affect the appearance of the coating and some performance.
2. On the contrary to turn method by changing the volume of water phase, the polymer from water-in-oil (w/o) state into oil-in-water (o/w) state, is a more effective method of preparation of polymer resin emulsion can be almost all the high polymer resin by means of additional emulsifier role through the corresponding physical emulsification method, the emulsion.
Contrary to the original refers to the continuous phase in the multicomponent system under certain conditions, the process of mutual transformation between such as in oil/water/emulsifier system, when the continuous phase from the aqueous phase oil or water from the oil phase shift, the continuous phase transition zone, the system of the minimum interfacial tension, so at this time the size of the dispersed phase is minimal.
The emulsion of polymer resin was emulsified by means of the opposite method, the size of the emulsion was smaller than the mechanical method, and the stability was better than the mechanical method. The average particle size of the dispersed phase was l ~ 2 mu m.
3. Waterborne epoxy resin is not emulsified with crosslinking agent, but emulsified epoxy resin by using crosslinking agent with a water-based epoxy resin with emulsifying effect. This kind of cross-linking agent with emulsifying properties is generally modified epoxy resin crosslinking agent, which has the function of both crosslinking and emulsifying low molecular weight of liquid epoxy resin.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packingļ¼ net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
Emulsified waterborne epoxy resin used crosslinking agent is usually epoxy resin - polyamine admixture. In general multivariate amine crosslinking agent in epoxy resin molecular chain segments, and adopt the method of salt to improve its water oil balance value, making it a liquid epoxy resin with low relative molecular mass and similar chain segment of sexual intercourse water dispersion agent.
Due to the emulsifier used in the cross-linking agent emulsification method and the crosslinking agent of epoxy resin, the performance of the film is better than the mechanical method of emulsifier and the reverse conversion method.
4. Chemical modification method is also called self-emulsification method, which is the main preparation method of water-based epoxy resin. Chemical modification method is through the open part of the epoxy resin molecules epoxy bond, the introduction of polar groups, or through free radical grafting reaction, introducing polar group into epoxy resin molecule in the skeleton, the hydrophilic groups or the chain segment has surface active function can help to epoxy resin dispersed in water.
Because the chemical modification method is to introduce hydrophilic groups directly into the molecules of epoxy resin through covalent bonds, the emulsion is stable and the particle size is small, which is nano-scale. The hydrophilic groups introduced by chemical modification method are hydrophilic segments with anions, cations or non-ions.
Nonionic waterborne epoxy resin: nonionic waterborne epoxy resin can be divided into of non-ionic emulsifier emulsified waterborne epoxy resin system and the emulsification nonionic waterborne epoxy resin system and nonionic waterborne epoxy crosslinking agent system.
Custom with chemical modification method of nonionic emulsifying water-based epoxy resin emulsion by only with hydrophilic polyoxyethylene chain segments, excluding Yin/cationic groups, therefore the emulsion adaptable to changes in pH, at the same time, the flexible and water resistance of the coating have larger ascension. Therefore, the development of modified non-ionic water-based epoxy resin system will become a new research hotspot in the field of waterborne epoxy coatings.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Emulsified waterborne epoxy resin used crosslinking agent is usually epoxy resin - polyamine admixture. In general multivariate amine crosslinking agent in epoxy resin molecular chain segments, and adopt the method of salt to improve its water oil balance value, making it a liquid epoxy resin with low relative molecular mass and similar chain segment of sexual intercourse water dispersion agent.
Due to the emulsifier used in the cross-linking agent emulsification method and the crosslinking agent of epoxy resin, the performance of the film is better than the mechanical method of emulsifier and the reverse conversion method.
4. Chemical modification method is also called self-emulsification method, which is the main preparation method of water-based epoxy resin. Chemical modification method is through the open part of the epoxy resin molecules epoxy bond, the introduction of polar groups, or through free radical grafting reaction, introducing polar group into epoxy resin molecule in the skeleton, the hydrophilic groups or the chain segment has surface active function can help to epoxy resin dispersed in water.
Because the chemical modification method is to introduce hydrophilic groups directly into the molecules of epoxy resin through covalent bonds, the emulsion is stable and the particle size is small, which is nano-scale. The hydrophilic groups introduced by chemical modification method are hydrophilic segments with anions, cations or non-ions.
Nonionic waterborne epoxy resin: nonionic waterborne epoxy resin can be divided into of non-ionic emulsifier emulsified waterborne epoxy resin system and the emulsification nonionic waterborne epoxy resin system and nonionic waterborne epoxy crosslinking agent system.
Custom with chemical modification method of nonionic emulsifying water-based epoxy resin emulsion by only with hydrophilic polyoxyethylene chain segments, excluding Yin/cationic groups, therefore the emulsion adaptable to changes in pH, at the same time, the flexible and water resistance of the coating have larger ascension. Therefore, the development of modified non-ionic water-based epoxy resin system will become a new research hotspot in the field of waterborne epoxy coatings.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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