News Details
Water-resistant room temperature paint crosslinking agent
2017-5-27 18:08:59
Water-resistant room temperature paint crosslinking agent
Experimental seed emulsion polymerization with core-shell structure, and to join in the shell DAAM, control of nuclear layer and shell monomer mass ratio is 1:1, designed to have a hardcore soft shell structure of latex particle, the particle design method can make the film has a certain hardness of both flexibility.
In addition, the aqueous solution of ADH and emulsion latex particle ketone carbonyl is a homogeneous reaction happened so ketone carbonyl group on the latex particle within the surface and was encased in latex particles, can produce great influence on the crosslinking reaction. So by core-shell emulsion polymerization and the DAAM in shell join method, can effectively improve the crosslink density, improve the utilization rate of DAAM and making film with lower water absorption and better comprehensive performance.
FTIR analysis: using an infrared spectrometer for testing; TEM analysis: using transmission electron microscopy to observe particle form; DSC analysis: the comprehensive thermal analyzer determine the Tg of polymer, the test temperature range for - 30 ~ 150 ℃, the heating rate of 20 ℃ / min, the nitrogen atmosphere.
Size: the laser particle size analyzer is used for testing.
Bibulous rate: will join the right amount of emulsion film-forming agent, made uniform latex film on glass plate, normal temperature film weigh off after 3 d, then immersed in distilled water for 24 h, with filter paper blot out with surface moisture, again weighing, calculation of water absorption.
Hardness: test (pencil hardness) in GB/T 6739-1996. Adhesion: test in GB/T 1720-1989.
Latex film crosslinking degree: after emulsion crosslinking 3 d at room temperature, the latex film removed from the base material, with benzene as solvent extraction for 24 h in the soxhlet extractor, using leftovers quality expressed as percentage of the initial film quality crosslinking degree.
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).
The effect of DAAM on film performance. DAAM with electronegativity of oxygen and nitrogen atoms, is a kind of important containing unsaturated vinyl monomers, itself have amino again, when the league on it as a stated functional monomers and acrylic ester copolymer, can improve the coating cohesion strength, improve the water resistance of coating.
On copolymer chain section at the same time, the introduction of a small amount of acid amine chain link, can control the movement of the polymer particles, prevent condensation, increasing viscosity, and pH buffer role of emulsion system, optimization of emulsion polymerization stability and storage stability of the system. Table 1 is the effect of DAAM dosage on emulsion performance [fixed m (ADH) : m (DAAM) = 1:1].
The effect of DAAM on film performance. Emulsion system with DAAM added, latex film crosslinking degree rise rapidly and intermolecular each other hand in the couplet with mesh structure of polymer, and with the increase of dosage of DAAM, latex film crosslinking degree first increase then decrease, latex film take the lead in reducing water and then increase, latex film hardness increase to 2 h after basically remain unchanged, but little effect on adhesion.
The reason is that after the addition of DAAM and ADH, the crosslinking network was established and expanded in the emulsion particles, increasing the cohesion of the membrane. As the interconnection points increase, the hardness of the membrane increases and the absorption rate decreases. But excessive dosage of DAAM, crosslinking spend big, will appear in the process of polymer particles, influence the stability of the emulsion and water absorption, and the coating is too brittle and affect the use of the emulsion.
Therefore, the use of DAAM should satisfy the high crosslinking degree and low water absorption rate of the adhesive film, and ensure the flexibility of the film and the stability of the emulsion. In combination, it is advisable to select DAAM for 1.5 ~ 2.0% of the unit mass.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Experimental seed emulsion polymerization with core-shell structure, and to join in the shell DAAM, control of nuclear layer and shell monomer mass ratio is 1:1, designed to have a hardcore soft shell structure of latex particle, the particle design method can make the film has a certain hardness of both flexibility.
In addition, the aqueous solution of ADH and emulsion latex particle ketone carbonyl is a homogeneous reaction happened so ketone carbonyl group on the latex particle within the surface and was encased in latex particles, can produce great influence on the crosslinking reaction. So by core-shell emulsion polymerization and the DAAM in shell join method, can effectively improve the crosslink density, improve the utilization rate of DAAM and making film with lower water absorption and better comprehensive performance.
FTIR analysis: using an infrared spectrometer for testing; TEM analysis: using transmission electron microscopy to observe particle form; DSC analysis: the comprehensive thermal analyzer determine the Tg of polymer, the test temperature range for - 30 ~ 150 ℃, the heating rate of 20 ℃ / min, the nitrogen atmosphere.
Size: the laser particle size analyzer is used for testing.
Bibulous rate: will join the right amount of emulsion film-forming agent, made uniform latex film on glass plate, normal temperature film weigh off after 3 d, then immersed in distilled water for 24 h, with filter paper blot out with surface moisture, again weighing, calculation of water absorption.
Hardness: test (pencil hardness) in GB/T 6739-1996. Adhesion: test in GB/T 1720-1989.
Latex film crosslinking degree: after emulsion crosslinking 3 d at room temperature, the latex film removed from the base material, with benzene as solvent extraction for 24 h in the soxhlet extractor, using leftovers quality expressed as percentage of the initial film quality crosslinking degree.
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).
The effect of DAAM on film performance. DAAM with electronegativity of oxygen and nitrogen atoms, is a kind of important containing unsaturated vinyl monomers, itself have amino again, when the league on it as a stated functional monomers and acrylic ester copolymer, can improve the coating cohesion strength, improve the water resistance of coating.
On copolymer chain section at the same time, the introduction of a small amount of acid amine chain link, can control the movement of the polymer particles, prevent condensation, increasing viscosity, and pH buffer role of emulsion system, optimization of emulsion polymerization stability and storage stability of the system. Table 1 is the effect of DAAM dosage on emulsion performance [fixed m (ADH) : m (DAAM) = 1:1].
The effect of DAAM on film performance. Emulsion system with DAAM added, latex film crosslinking degree rise rapidly and intermolecular each other hand in the couplet with mesh structure of polymer, and with the increase of dosage of DAAM, latex film crosslinking degree first increase then decrease, latex film take the lead in reducing water and then increase, latex film hardness increase to 2 h after basically remain unchanged, but little effect on adhesion.
The reason is that after the addition of DAAM and ADH, the crosslinking network was established and expanded in the emulsion particles, increasing the cohesion of the membrane. As the interconnection points increase, the hardness of the membrane increases and the absorption rate decreases. But excessive dosage of DAAM, crosslinking spend big, will appear in the process of polymer particles, influence the stability of the emulsion and water absorption, and the coating is too brittle and affect the use of the emulsion.
Therefore, the use of DAAM should satisfy the high crosslinking degree and low water absorption rate of the adhesive film, and ensure the flexibility of the film and the stability of the emulsion. In combination, it is advisable to select DAAM for 1.5 ~ 2.0% of the unit mass.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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