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Single component water based coating is used crosslinking agent
2017-6-5 16:40:57
Single component water based coating is used crosslinking agent
The synthesis of AAEM self-crosslinking emulsion was synthesized by using pre-emulsified monomer semi-continuous emulsion polymerization. Concrete aggregate method is as follows: 1.8 g, emulsifier, buffer NaHCO3 0.15 g and 100 ml 100 ml distilled water added to the reaction kettle, heating up to 60 ℃ and rapid mixing. The first is 23.2, 65.7 g MMA, 23.2 g EHA, 2.0 g MAA, 0 ~ 12.0 gAAEM monomer, and mix them together. It is also called the 1.8 g emulsifier and dissolved in 60 ml distilled water, and the mixture is added at high speed, and the pre-emulsion 10 min is pre-emulsified monomer.
Added to the reaction kettle will be part of the pre emulsified monomers, quick stir after 5 min, up to 76 ℃, reduce the stirring speed to 300 r/min, to join the APS, initiator solution polymerization reaction; When the solution of the reactive system becomes blue and the monomer reflux vanishes, the preemulsifying monomer is added to the feed rate of 1 ml/min; When the monomer is added, it will continue to heat up to 3 h, stop heating and cooling. In ammonia water, the pH is 8.5 ~ 9.0, add the HDA solution of the equivalent of AAEM, stir well, and filter with 400 mesh screen, and obtain self-crosslinking emulsion.
Representations of latex particles and crosslinking reactions. The latex particles are spherical, about 80 nanometers in diameter, and the particle size is narrower.
Acetyl acetyl oxygen and diamine is a dehydration reaction, a curve, you can see that 3 and 1 567 cm - 342 cm - 1 1 are respectively the HDA amino stretching vibration absorption peak deformation and vibration absorption peak; 2, 930 cm minus 1 and 2, 855 cm minus 1 is the methylene absorption peak of HDA.
As you can see from the b curve, at 2, 961cm - 1 and 2, 930 cm-1, the absorption peak is the methyl group of AAEM, the contraction of the methyl group, and the absorption peak of the methyl group; 1, 363 cm minus 1 is the transformation of the methyl group. The absorption peaks of A A A E M of ester carbonyl and ketocarbonyl are 1, 748.6 cm -1 and 1 719.5 cm-1 respectively. 1 637 cm - 1 is the characteristic absorption peak of unsaturated double bonds.
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 infrared spectrum from the emulsion reaction shows that the unsaturated double bond absorption peaks of the AAEM at 1 637 cm - 1 indicate that A A E M has been aggregated into the polymer chain. Because the absorption peaks of ketocarbonyl and ester carbonyl are overlapped, the uptake of ketone carbonyl in 1, 719.5 cm-1 is not obvious, and is characterized by a wide absorption peak.
After crosslinking 2 d under room temperature 25 ℃, 1, 719.5 cm - 1 consists of a wide place carbonyl peak into the absorption of a sharp peak, peak strong big reduced, at the same time between 1 and 1, 601.1 650.3 cm - 1 cm - 1 in 2 new absorption peak, respectively enamine key (- CH = C - NH -) of unsaturated double bond and imide key characteristic absorption peak, showed that oxygen and acetyl acetyl hexamethylenediamine crosslinking reactions have occurred, generate enamine key structure.
The effect of A A E M on the emulsion and coating properties. The amount of functional unit A E M not only affects the film performance of the emulsion, but also affects the cross-linking density of the coating and the final coating properties.
When AAEM is lower than 7.5%, emulsion has good film-forming ability, show that acetyl acetyl oxygen and diamine crosslinking reactions after the emulsion film, crosslinking reaction does not affect the film forming process of the spread of the molecular chain. With the increase of A A E M, the coated pencil is stiffer, more resistant to water, and has better anti-shock ability and adhesion.
As shown in table 1, the coating is completely dissolved when it is not introduced in the emulsion. When 1 % AAEM was introduced, the gel content was 76 percent. Further increase the amount of AAEM to 4% and the coated gel is greater than 94 %. Show that oxygen and diamine by acetyl acetyl crosslinking reaction, make the whole film formed a large network, the comprehensive performance of coating has been greatly improved.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
The synthesis of AAEM self-crosslinking emulsion was synthesized by using pre-emulsified monomer semi-continuous emulsion polymerization. Concrete aggregate method is as follows: 1.8 g, emulsifier, buffer NaHCO3 0.15 g and 100 ml 100 ml distilled water added to the reaction kettle, heating up to 60 ℃ and rapid mixing. The first is 23.2, 65.7 g MMA, 23.2 g EHA, 2.0 g MAA, 0 ~ 12.0 gAAEM monomer, and mix them together. It is also called the 1.8 g emulsifier and dissolved in 60 ml distilled water, and the mixture is added at high speed, and the pre-emulsion 10 min is pre-emulsified monomer.
Added to the reaction kettle will be part of the pre emulsified monomers, quick stir after 5 min, up to 76 ℃, reduce the stirring speed to 300 r/min, to join the APS, initiator solution polymerization reaction; When the solution of the reactive system becomes blue and the monomer reflux vanishes, the preemulsifying monomer is added to the feed rate of 1 ml/min; When the monomer is added, it will continue to heat up to 3 h, stop heating and cooling. In ammonia water, the pH is 8.5 ~ 9.0, add the HDA solution of the equivalent of AAEM, stir well, and filter with 400 mesh screen, and obtain self-crosslinking emulsion.
Representations of latex particles and crosslinking reactions. The latex particles are spherical, about 80 nanometers in diameter, and the particle size is narrower.
Acetyl acetyl oxygen and diamine is a dehydration reaction, a curve, you can see that 3 and 1 567 cm - 342 cm - 1 1 are respectively the HDA amino stretching vibration absorption peak deformation and vibration absorption peak; 2, 930 cm minus 1 and 2, 855 cm minus 1 is the methylene absorption peak of HDA.
As you can see from the b curve, at 2, 961cm - 1 and 2, 930 cm-1, the absorption peak is the methyl group of AAEM, the contraction of the methyl group, and the absorption peak of the methyl group; 1, 363 cm minus 1 is the transformation of the methyl group. The absorption peaks of A A A E M of ester carbonyl and ketocarbonyl are 1, 748.6 cm -1 and 1 719.5 cm-1 respectively. 1 637 cm - 1 is the characteristic absorption peak of unsaturated double bonds.
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 infrared spectrum from the emulsion reaction shows that the unsaturated double bond absorption peaks of the AAEM at 1 637 cm - 1 indicate that A A E M has been aggregated into the polymer chain. Because the absorption peaks of ketocarbonyl and ester carbonyl are overlapped, the uptake of ketone carbonyl in 1, 719.5 cm-1 is not obvious, and is characterized by a wide absorption peak.
After crosslinking 2 d under room temperature 25 ℃, 1, 719.5 cm - 1 consists of a wide place carbonyl peak into the absorption of a sharp peak, peak strong big reduced, at the same time between 1 and 1, 601.1 650.3 cm - 1 cm - 1 in 2 new absorption peak, respectively enamine key (- CH = C - NH -) of unsaturated double bond and imide key characteristic absorption peak, showed that oxygen and acetyl acetyl hexamethylenediamine crosslinking reactions have occurred, generate enamine key structure.
The effect of A A E M on the emulsion and coating properties. The amount of functional unit A E M not only affects the film performance of the emulsion, but also affects the cross-linking density of the coating and the final coating properties.
When AAEM is lower than 7.5%, emulsion has good film-forming ability, show that acetyl acetyl oxygen and diamine crosslinking reactions after the emulsion film, crosslinking reaction does not affect the film forming process of the spread of the molecular chain. With the increase of A A E M, the coated pencil is stiffer, more resistant to water, and has better anti-shock ability and adhesion.
As shown in table 1, the coating is completely dissolved when it is not introduced in the emulsion. When 1 % AAEM was introduced, the gel content was 76 percent. Further increase the amount of AAEM to 4% and the coated gel is greater than 94 %. Show that oxygen and diamine by acetyl acetyl crosslinking reaction, make the whole film formed a large network, the comprehensive performance of coating has been greatly improved.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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