News Details
Metal oxide and soluble metal salt crosslinking agent
2017-5-3 16:26:17
Metal oxide and soluble metal salt crosslinking agent. The metal oxide is zinc oxide, magnesium oxide, calcium oxide and so on. Soluble metal salts are carbonate, sulphate, and chloride of zinc, calcium, magnesium, aluminum, etc.
This kind of crosslinking agent reacts with the sodium water glass to produce a white gelatinous precipitate that does not dissolve in water. This kind of precipitation is not only buoyant, but also has a certain covering ability.
So this kind of modification not only increases the water resistance of the coating, but also can save a certain amount of polyvinyl alcohol and filling material. The soluble metal salt and sodium water glass equation are as follows (in the case of MgCl2) : Na2O? NSiO2 + mH2O + MgCl22NaCl + Mg (OH) 2, + nSiO2? (m-1) H2O has been studied more closely with the metal inorganic salt water glass.
Two series of coatings were developed in 1987 and 1991, and the amount of polyvinyl alcohol was reduced to 16kg. T coating, all kinds of performance indexes meet or exceed 106 coatings.
Use of soluble metal salt modified sodium silicate process, different requirements for different kinds of metal salts of sodium silicate, different dosage of inorganic salt, adopted by the process route is also different, ignore any point will lead to the failure of the modification technology.
Use calcium salt to modify the water glass because this water glass contains a lot of so2-4. Because Ca (OH) 2 is bigger than the solubility of CaSO4 (S) a lot (25 ℃ when the SCa (OH) 2 = 2.2 x 10-2 mol? L, SCaSO4 = 3.6 x 10-4 mol? L), calcium salt and the generation of SO2-4 CaSO4, rather than the Ca (OH) 2, viscosity decreases, and thus lead to coating adhesion is poor, coating easy off powder.
Due to the low price of the grain, the water glass made by township manufacturers is used in the majority of the water glass, so the method of calcium salt modification is limited in use.
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
The white Ca (OH) 2 precipitate is produced by the addition of a silicate solution when the water glass is modified with calcium salt. The solubility of Ca (OH) 2 as the temperature decreases (0 ℃ S = 0.185 g? 100 ml water, 100 ℃ S = 0.077 g? 100 ml water), coating production when the tank temperature is higher than the room temperature, therefore, released from the reaction tank coating after cooling to room temperature to return rare phenomenon.
When applied to the thickness of the coating with four cup viscosimeter, it should be at room temperature when cold to room temperature, and the general viscosity is about 40 seconds. Modification with aluminium salt, the sodium silicate species has no special requirements, because of the existence of SO2-4 will not affect the precipitation of Al (OH) 3 generation, so use of glauber's salt sodium silicate can also get good modification effect.
The dissolved solubility of Al (OH) is not changed with temperature, the coating is not diluted, and the thin consistency is easy to control. When modified with aluminum salt, charging time control is crucial, because amorphous Al (OH) 3 solubility product constant value is small (Ksp = 1.3 x 10-33), so when the modified positive reaction is a big trend.
If sodium silicate in slow, aluminum salt will react with sodium silicate of modified polyvinyl alcohol, destroyed the modification of poly (vinyl alcohol), resulting in coating greatly reduced viscosity, coating powder.
Than aluminum salt and calcium salt modification as a generation of Al (OH) 3 is a kind of amorphous gel precipitation, the cohesive force, suspended than the Ca (OH) 2 is good, therefore modification of the coating with aluminum salt is more superior than with the performance of the calcium salt, at the same time, the dosage of pva can be further reduced.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
This kind of crosslinking agent reacts with the sodium water glass to produce a white gelatinous precipitate that does not dissolve in water. This kind of precipitation is not only buoyant, but also has a certain covering ability.
So this kind of modification not only increases the water resistance of the coating, but also can save a certain amount of polyvinyl alcohol and filling material. The soluble metal salt and sodium water glass equation are as follows (in the case of MgCl2) : Na2O? NSiO2 + mH2O + MgCl22NaCl + Mg (OH) 2, + nSiO2? (m-1) H2O has been studied more closely with the metal inorganic salt water glass.
Two series of coatings were developed in 1987 and 1991, and the amount of polyvinyl alcohol was reduced to 16kg. T coating, all kinds of performance indexes meet or exceed 106 coatings.
Use of soluble metal salt modified sodium silicate process, different requirements for different kinds of metal salts of sodium silicate, different dosage of inorganic salt, adopted by the process route is also different, ignore any point will lead to the failure of the modification technology.
Use calcium salt to modify the water glass because this water glass contains a lot of so2-4. Because Ca (OH) 2 is bigger than the solubility of CaSO4 (S) a lot (25 ℃ when the SCa (OH) 2 = 2.2 x 10-2 mol? L, SCaSO4 = 3.6 x 10-4 mol? L), calcium salt and the generation of SO2-4 CaSO4, rather than the Ca (OH) 2, viscosity decreases, and thus lead to coating adhesion is poor, coating easy off powder.
Due to the low price of the grain, the water glass made by township manufacturers is used in the majority of the water glass, so the method of calcium salt modification is limited in use.
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
The white Ca (OH) 2 precipitate is produced by the addition of a silicate solution when the water glass is modified with calcium salt. The solubility of Ca (OH) 2 as the temperature decreases (0 ℃ S = 0.185 g? 100 ml water, 100 ℃ S = 0.077 g? 100 ml water), coating production when the tank temperature is higher than the room temperature, therefore, released from the reaction tank coating after cooling to room temperature to return rare phenomenon.
When applied to the thickness of the coating with four cup viscosimeter, it should be at room temperature when cold to room temperature, and the general viscosity is about 40 seconds. Modification with aluminium salt, the sodium silicate species has no special requirements, because of the existence of SO2-4 will not affect the precipitation of Al (OH) 3 generation, so use of glauber's salt sodium silicate can also get good modification effect.
The dissolved solubility of Al (OH) is not changed with temperature, the coating is not diluted, and the thin consistency is easy to control. When modified with aluminum salt, charging time control is crucial, because amorphous Al (OH) 3 solubility product constant value is small (Ksp = 1.3 x 10-33), so when the modified positive reaction is a big trend.
If sodium silicate in slow, aluminum salt will react with sodium silicate of modified polyvinyl alcohol, destroyed the modification of poly (vinyl alcohol), resulting in coating greatly reduced viscosity, coating powder.
Than aluminum salt and calcium salt modification as a generation of Al (OH) 3 is a kind of amorphous gel precipitation, the cohesive force, suspended than the Ca (OH) 2 is good, therefore modification of the coating with aluminum salt is more superior than with the performance of the calcium salt, at the same time, the dosage of pva can be further reduced.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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