News Details
Waterborne epoxy coating crosslinking agent
2017-7-24 16:51:21
Waterborne epoxy coating crosslinking agent
The emulsion particle size analysis of the emulsified EPON828 was obtained by the synthesis of aqueous epoxy crosslinking agent at room temperature. Small particle size of emulsion, are all below 1 microns, shows that it has the good function of emulsified liquid epoxy resin of low molecular weight, the synthesis of waterborne epoxy crosslinking agent has a unique molecular structure inseparable: contain similar to be emulsified liquid epoxy resin is extremely hydrophobic chain segment, containing hydrophilic flexible polyether chain segments at the same time.
At room temperature, the synthesized water-based epoxy class crosslinking agent was prepared with the liquid epoxy resin EPON828 with epoxy/amine hydrogen (1/1), which was paired with a water-based epoxy coating, and compared with the coating properties. The experimental results show that the coating properties of the self-made water-based epoxy cross-linking agent are excellent in flexibility and impact resistance, and improve the defects of the general epoxy resin.
Preparation of waterborne epoxy coatings and determination of coating properties. The preparation of waterborne epoxy coatings: water-based epoxy crosslinking agent into the paint cup, according to the epoxide and amine hydrogen mole ratio of 1:1, EPON828 mix slowly at high speed, continue stirring dispersion for 10 minutes, the match into a two-component waterborne epoxy coatings.
Determination of film coating properties: film-forming substrate is treated by acetone cleaning. The flexibility is based on GB/t1731-93 and the impact resistance is GB/t1732-93, and the drying time is GB/t1728-79, and the hardness is tested by GB/t1730-93.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material :
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
The emulsion particle size analysis of the emulsified EPON828 was obtained by the synthesis of aqueous epoxy crosslinking agent at room temperature. Small particle size of emulsion, are all below 1 microns, shows that it has the good function of emulsified liquid epoxy resin of low molecular weight, the synthesis of waterborne epoxy crosslinking agent has a unique molecular structure inseparable: contain similar to be emulsified liquid epoxy resin is extremely hydrophobic chain segment, containing hydrophilic flexible polyether chain segments at the same time.
At room temperature, the synthesized water-based epoxy class crosslinking agent was prepared with the liquid epoxy resin EPON828 with epoxy/amine hydrogen (1/1), which was paired with a water-based epoxy coating, and compared with the coating properties. The experimental results show that the coating properties of the self-made water-based epoxy cross-linking agent are excellent in flexibility and impact resistance, and improve the defects of the general epoxy resin.
Preparation of waterborne epoxy coatings and determination of coating properties. The preparation of waterborne epoxy coatings: water-based epoxy crosslinking agent into the paint cup, according to the epoxide and amine hydrogen mole ratio of 1:1, EPON828 mix slowly at high speed, continue stirring dispersion for 10 minutes, the match into a two-component waterborne epoxy coatings.
Determination of film coating properties: film-forming substrate is treated by acetone cleaning. The flexibility is based on GB/t1731-93 and the impact resistance is GB/t1732-93, and the drying time is GB/t1728-79, and the hardness is tested by GB/t1730-93.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material :
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
Under the protection of dry nitrogen, the TETA's PM solution is put into the 500 mL four reaction bottle containing reflux condensing tube, thermometer and agitator. The paddle type is an anchor impeller mixer, stirring speed of 500 r? Min? 1. The heating form is water bath temperature. In the setting of temperature range, the reaction in the reaction bottle at 60 mL per hour will be added to the reaction bottle, and then the heat preservation reaction will be a period of time.
Reaction material molar ratio test. The reaction temperature is 65 ℃, reaction time was 4.0 h, under the condition of investigation material mole ratio (TETA/DGEPG) affect DGEPG epoxy conversion rate. In order to get the target product, the material molar ratio of TETA/dgepgs should not be lower than the stoichiometric ratio of 2.0.
Experimental results show that under the experimental conditions, as the mole ratio of material (TETA/DGEPG), DGEPG epoxy conversion rate also increased, but when the material mole ratio reaches more than 2.2, the epoxy conversion rate increase amplitude decreases, at the same time consider excessive TETA behind process should be separate vacuum distillation, so the suitable material mole ratio (TETA/DGEPG) is 2.2/1.
Reaction temperature condition test. The effect of reaction temperature on the conversion rate of DGEPG was investigated under the condition that the material molar ratio (TETA/DGEPG) was 2.2/1 and the reaction time was 4.0h.
Under the experimental conditions, low reaction temperature, epoxy conversion rate is too low, and the temperature is too high, then increasing the TETA secondary amine hydrogen reaction with epoxy group activity, prone to side effects, even gel, so the suitable reaction temperature is 65 ℃.
Reaction time condition test. In material mole ratio (TETA/DGEPG) at 2.2/1, under the condition of the reaction temperature is 65 ℃, study the influence of the reaction time of DGEPG epoxy conversion.
Under the condition of setting, with epoxy conversion rate increased with increasing the reaction time, when the reaction time is 4.0 h, the conversion increases with time extension of the amplitude is small, so under the experimental conditions, determine the appropriate response time of 4.0 h.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Under the protection of dry nitrogen, the TETA's PM solution is put into the 500 mL four reaction bottle containing reflux condensing tube, thermometer and agitator. The paddle type is an anchor impeller mixer, stirring speed of 500 r? Min? 1. The heating form is water bath temperature. In the setting of temperature range, the reaction in the reaction bottle at 60 mL per hour will be added to the reaction bottle, and then the heat preservation reaction will be a period of time.
Reaction material molar ratio test. The reaction temperature is 65 ℃, reaction time was 4.0 h, under the condition of investigation material mole ratio (TETA/DGEPG) affect DGEPG epoxy conversion rate. In order to get the target product, the material molar ratio of TETA/dgepgs should not be lower than the stoichiometric ratio of 2.0.
Experimental results show that under the experimental conditions, as the mole ratio of material (TETA/DGEPG), DGEPG epoxy conversion rate also increased, but when the material mole ratio reaches more than 2.2, the epoxy conversion rate increase amplitude decreases, at the same time consider excessive TETA behind process should be separate vacuum distillation, so the suitable material mole ratio (TETA/DGEPG) is 2.2/1.
Reaction temperature condition test. The effect of reaction temperature on the conversion rate of DGEPG was investigated under the condition that the material molar ratio (TETA/DGEPG) was 2.2/1 and the reaction time was 4.0h.
Under the experimental conditions, low reaction temperature, epoxy conversion rate is too low, and the temperature is too high, then increasing the TETA secondary amine hydrogen reaction with epoxy group activity, prone to side effects, even gel, so the suitable reaction temperature is 65 ℃.
Reaction time condition test. In material mole ratio (TETA/DGEPG) at 2.2/1, under the condition of the reaction temperature is 65 ℃, study the influence of the reaction time of DGEPG epoxy conversion.
Under the condition of setting, with epoxy conversion rate increased with increasing the reaction time, when the reaction time is 4.0 h, the conversion increases with time extension of the amplitude is small, so under the experimental conditions, determine the appropriate response time of 4.0 h.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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