News Details
Cathodic electrophoresis coating crosslinking agent
2017-6-1 11:03:59
Cathodic electrophoresis coating crosslinking agent
Cathodic electrophoretic coating has overcome anodic electrophoretic coating paint are easy to precipitate and film the poor corrosion resistance, good swimming through force and excellent corrosion resistance, acrylic cathodic electrophoretic coating because of its excellent properties, such as light, weather resistance, high decorative and widely used in the bottom and electrophoresis coating.
In this study, on the basis of the preparation of cationic acrylic hydroxyl resin with acrylic resin by double bond of siloxane double bonds on the reaction of the silane grafted onto the acrylic resin, the preparation of single-component self-crosslinking acrylic cathodic electrophoretic coating resin, is of great significance both in theory and application.
Experimental raw materials and reagents: methyl methacrylate (MMA), azo diisobutyronitrile (AIBN), ethylene glycol monobutyl ether, were chemically pure; Acrylate (BA), benzoyl peroxide (BPO), n-butyl alcohol, and acetic acid are all analyzed. Different synthetic borneol methacrylate (IBMA), hydroxyl ethyl methacrylate (HEMA), methyl acrylic acid, N, N - dimethyl amine ethyl ester (DMAEMA), N - methylol acrylamide (NMA), organic siloxane monomer (1706), are all industrial products.
The synthesis of modified acrylic resin: the polymerization reaction is carried out in the N2 atmosphere, the total mass of the monomer is 10g, the initiator quality is 3% of the monomer, the solvent 3g, the ionized water 40g.
Using three kinds of polymerization process: (1) one-time feeding method. The initiator in the solvent dissolved in monomer, reaction under a certain temperature for 5 h, then cooled to 50 ℃ to join and DMAEMA substances such as the amount of acetic acid neutralization, adding deionized water dispersed quickly. (2) the semi-continuous drop addition. The initiator in the solvent dissolved in monomer, then transfers the 1/3 of the mixture into three flask, remaining within 2 h continuous drip added to the mixture, drip off heat preservation 3 h, the remaining steps up. (3) continuous drip addition. The initiator with solvent soluble in monomer in within 3 h of continuous drops to the three flask, drip off insulation 2 h, the remaining steps.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packing： 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).
Analysis of the test. The use of the Tensor37 infrared spectrometer (FTIR) for infrared spectrum analysis; With PERKIN ELMER - (DSC), differential scanning calorimeter N2 atmosphere, the sample from room temperature rapidly heated to 120 ℃, and then cooled to - 20 ℃, and then with 10 ℃ / min speed up to 80 ℃ for Tg analysis.
BROOKFIELDDV Ⅱ + rotating viscometer dispersion viscosity measurement; H-300 transmission electron microscope to observe the particle form; Will be made coating, dispersion with tetrahydrofuran as solvent, using soxhlet extractor extraction 24 h, drying, according to the formula: crosslinking degree = (w2 - w0)/(w1 - w0) x 100% computation crosslinking degree, w0, w1 and w2 are filter paper, take the quality of the samples and the quality of the filter paper in advance, after extraction of the sample and the quality of the filter paper.
Will dispersion evenly coated on the pure ptfe pieces, 48 h, around 60 ℃ first vacuum drying to water and solvent volatilization again in around 135 ℃ dry 2 h, after drying the coating directly into distilled water, every weighing a period of time, according to the formula to calculate water absorption, water absorption rate = (wa - w)/w x 100%, wa, w respectively after absorbing water and the water absorption before coating quality.
The effect of polymerization process on the storage stability of dispersed liquid. The storage stability of dispersive liquid is an important factor affecting the properties of waterborne resin.
One-time feeding method of the preparation of the resin dispersion, the more stable viscosity saw no changes after 3 months. The reason is the preparation of the resin in our study was in the oil phase, and the aggregated dispersed into water phase after the end of the polymerization is different from ordinary emulsion polymerization.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Cathodic electrophoretic coating has overcome anodic electrophoretic coating paint are easy to precipitate and film the poor corrosion resistance, good swimming through force and excellent corrosion resistance, acrylic cathodic electrophoretic coating because of its excellent properties, such as light, weather resistance, high decorative and widely used in the bottom and electrophoresis coating.
In this study, on the basis of the preparation of cationic acrylic hydroxyl resin with acrylic resin by double bond of siloxane double bonds on the reaction of the silane grafted onto the acrylic resin, the preparation of single-component self-crosslinking acrylic cathodic electrophoretic coating resin, is of great significance both in theory and application.
Experimental raw materials and reagents: methyl methacrylate (MMA), azo diisobutyronitrile (AIBN), ethylene glycol monobutyl ether, were chemically pure; Acrylate (BA), benzoyl peroxide (BPO), n-butyl alcohol, and acetic acid are all analyzed. Different synthetic borneol methacrylate (IBMA), hydroxyl ethyl methacrylate (HEMA), methyl acrylic acid, N, N - dimethyl amine ethyl ester (DMAEMA), N - methylol acrylamide (NMA), organic siloxane monomer (1706), are all industrial products.
The synthesis of modified acrylic resin: the polymerization reaction is carried out in the N2 atmosphere, the total mass of the monomer is 10g, the initiator quality is 3% of the monomer, the solvent 3g, the ionized water 40g.
Using three kinds of polymerization process: (1) one-time feeding method. The initiator in the solvent dissolved in monomer, reaction under a certain temperature for 5 h, then cooled to 50 ℃ to join and DMAEMA substances such as the amount of acetic acid neutralization, adding deionized water dispersed quickly. (2) the semi-continuous drop addition. The initiator in the solvent dissolved in monomer, then transfers the 1/3 of the mixture into three flask, remaining within 2 h continuous drip added to the mixture, drip off heat preservation 3 h, the remaining steps up. (3) continuous drip addition. The initiator with solvent soluble in monomer in within 3 h of continuous drops to the three flask, drip off insulation 2 h, the remaining steps.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packing： 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).
Analysis of the test. The use of the Tensor37 infrared spectrometer (FTIR) for infrared spectrum analysis; With PERKIN ELMER - (DSC), differential scanning calorimeter N2 atmosphere, the sample from room temperature rapidly heated to 120 ℃, and then cooled to - 20 ℃, and then with 10 ℃ / min speed up to 80 ℃ for Tg analysis.
BROOKFIELDDV Ⅱ + rotating viscometer dispersion viscosity measurement; H-300 transmission electron microscope to observe the particle form; Will be made coating, dispersion with tetrahydrofuran as solvent, using soxhlet extractor extraction 24 h, drying, according to the formula: crosslinking degree = (w2 - w0)/(w1 - w0) x 100% computation crosslinking degree, w0, w1 and w2 are filter paper, take the quality of the samples and the quality of the filter paper in advance, after extraction of the sample and the quality of the filter paper.
Will dispersion evenly coated on the pure ptfe pieces, 48 h, around 60 ℃ first vacuum drying to water and solvent volatilization again in around 135 ℃ dry 2 h, after drying the coating directly into distilled water, every weighing a period of time, according to the formula to calculate water absorption, water absorption rate = (wa - w)/w x 100%, wa, w respectively after absorbing water and the water absorption before coating quality.
The effect of polymerization process on the storage stability of dispersed liquid. The storage stability of dispersive liquid is an important factor affecting the properties of waterborne resin.
One-time feeding method of the preparation of the resin dispersion, the more stable viscosity saw no changes after 3 months. The reason is the preparation of the resin in our study was in the oil phase, and the aggregated dispersed into water phase after the end of the polymerization is different from ordinary emulsion polymerization.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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