News Details
Crosslinking agent for sealing end water type polyurethane coating
2017-5-16 17:09:51
Crosslinking agent for sealing end water type polyurethane coating:
The effect of the 6NaHSO3 mass fraction on the end reaction
In the course of the reaction, the hydrogen-ion and the water can react with an NCO basis, so the mass fraction of the hydrogen-sulphate ions has a certain effect on the sealing end rate.
With the increase of the sodium hydrogen sulfite, the end of the sealing is decreased. When the salt quality score is 25%, the sealing rate is highest. Low sodium hydrogen sulfite and water component, the water is more likely to react with the free one NCO.
When the sodium bisulfite concentration increases to a certain extent, the dissolution of solvent and water saturation reach saturation, two water oil balance, reaction good stability, high end capping rate, closed dissolve polymer content further. In this case, the risk of water and a free NCO reaction is small, and the competitive advantage of the hydrogen-sulfuric acid is greater than that of the water, allowing the hydrogen-sulfuric acid to be fully responsive to the free one NCO.
With the increase of the sodium hydrogen sulfite, the balance between the oil and water has been destroyed, the reaction degree has decreased, and the closure rate has decreased. On the other hand, due to the increase of sodium hydrogen sulfite, the reaction viscosity increases very quickly, and the reaction is low. In this case, the quality score of sodium hydrogen sulfite is 25%.
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).
When NaHSO3 mass fraction is low, as previously mentioned, isocyanate and side effects of water increases, the sealing rate is low, so in the high temperature baking, unlock the isocyanate is less, less crosslinking on the fabric formation, improve on the rubbing fastness of the fabric effect is poorer. When the quality score of the NaHSO3 was too high, the reaction viscosity increased very quickly, and a large amount of glue was formed, and the closure rate was low, which also affected the processing effect of the fabric. Consider taking the NaHSO3 mass score of 25%.
The effect of accelerator on the end reaction. "Dynamic balance of sodium bisulfite in aqueous solution NaHSO3 ? Na++ HSO3 - Na + H + SO32 - + HSO3 -
In the course of the reaction, the ionization of the hydrosulfite is bad for the end reaction. If added sodium sulfite can inhibit the ionization of hydrogen-sulfite, promote the sealing end reaction, and increase the sealing rate.
When sodium sulfite is less than 0 for sodium sulfite. At 2, the sealing rate increases with the increase of the ratio, indicating that the ionizing degree of sodium sulfite is large, and the sodium sulfite must be added during the sealing process. When the ratio of sodium sulfite to sodium sulfite was greater than 0.2, the sealing rate decreased with the increase of the ratio. The ratio of the two is the highest of the two. In addition to enhancing the sealing end rate, it also inhibits the hydrolysis of isocyanate. So, sodium sulfite and sodium sulfite have a mole fraction of 0.2.
The effect of solvent dosage on the end reaction. Performed after the completion of the reaction, the system has certain viscosity, before the sealing side reaction, need to add a certain amount of solvent, in order to reduce the system viscosity, it is the effect of solvent dilution pre polymers and the macromolecular fully stretch, well connect the oil-water two phase, promote sealing side reaction.
As the levels of acetone increase, the sealing rate increases gradually, and when the quality score of acetone is 25%, the sealing rate reaches the highest. When the quality fraction of acetone was increased from 25% to 30%, the sealing rate was decreasing. This is because the amount of acetone is too much, diluting the concentration of an NCO and HSO3, leading to a drop in the closure rate. As a result, the synthetic test took the grade of acetone in 25%.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
The effect of the 6NaHSO3 mass fraction on the end reaction
In the course of the reaction, the hydrogen-ion and the water can react with an NCO basis, so the mass fraction of the hydrogen-sulphate ions has a certain effect on the sealing end rate.
With the increase of the sodium hydrogen sulfite, the end of the sealing is decreased. When the salt quality score is 25%, the sealing rate is highest. Low sodium hydrogen sulfite and water component, the water is more likely to react with the free one NCO.
When the sodium bisulfite concentration increases to a certain extent, the dissolution of solvent and water saturation reach saturation, two water oil balance, reaction good stability, high end capping rate, closed dissolve polymer content further. In this case, the risk of water and a free NCO reaction is small, and the competitive advantage of the hydrogen-sulfuric acid is greater than that of the water, allowing the hydrogen-sulfuric acid to be fully responsive to the free one NCO.
With the increase of the sodium hydrogen sulfite, the balance between the oil and water has been destroyed, the reaction degree has decreased, and the closure rate has decreased. On the other hand, due to the increase of sodium hydrogen sulfite, the reaction viscosity increases very quickly, and the reaction is low. In this case, the quality score of sodium hydrogen sulfite is 25%.
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).
When NaHSO3 mass fraction is low, as previously mentioned, isocyanate and side effects of water increases, the sealing rate is low, so in the high temperature baking, unlock the isocyanate is less, less crosslinking on the fabric formation, improve on the rubbing fastness of the fabric effect is poorer. When the quality score of the NaHSO3 was too high, the reaction viscosity increased very quickly, and a large amount of glue was formed, and the closure rate was low, which also affected the processing effect of the fabric. Consider taking the NaHSO3 mass score of 25%.
The effect of accelerator on the end reaction. "Dynamic balance of sodium bisulfite in aqueous solution NaHSO3 ? Na++ HSO3 - Na + H + SO32 - + HSO3 -
In the course of the reaction, the ionization of the hydrosulfite is bad for the end reaction. If added sodium sulfite can inhibit the ionization of hydrogen-sulfite, promote the sealing end reaction, and increase the sealing rate.
When sodium sulfite is less than 0 for sodium sulfite. At 2, the sealing rate increases with the increase of the ratio, indicating that the ionizing degree of sodium sulfite is large, and the sodium sulfite must be added during the sealing process. When the ratio of sodium sulfite to sodium sulfite was greater than 0.2, the sealing rate decreased with the increase of the ratio. The ratio of the two is the highest of the two. In addition to enhancing the sealing end rate, it also inhibits the hydrolysis of isocyanate. So, sodium sulfite and sodium sulfite have a mole fraction of 0.2.
The effect of solvent dosage on the end reaction. Performed after the completion of the reaction, the system has certain viscosity, before the sealing side reaction, need to add a certain amount of solvent, in order to reduce the system viscosity, it is the effect of solvent dilution pre polymers and the macromolecular fully stretch, well connect the oil-water two phase, promote sealing side reaction.
As the levels of acetone increase, the sealing rate increases gradually, and when the quality score of acetone is 25%, the sealing rate reaches the highest. When the quality fraction of acetone was increased from 25% to 30%, the sealing rate was decreasing. This is because the amount of acetone is too much, diluting the concentration of an NCO and HSO3, leading to a drop in the closure rate. As a result, the synthetic test took the grade of acetone in 25%.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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