News Details
Metal oxide and soluble metal salt paint crosslinking agent
2017-9-1 12:16:32
Metal oxide and soluble metal salt paint crosslinking agent
The metal oxide has zinc oxide, magnesium oxide, calcium oxide and so on. The soluble metal salts are zinc, calcium, magnesium, aluminum and other polyvalent metal carbonate, sulfate and chloride.
The metal oxide and soluble metal salt crosslinking agent and sodium water glass reaction, in addition to the formation of silicic acid sol, also produced an insoluble white gelatinous precipitation. This kind of precipitation not only has a good suspension, but also has certain covering ability.
Therefore, the modification of such metal oxide and soluble metal salt crosslinking agent not only improves the water resistance of coating, but also can save a certain amount of polyvinyl alcohol and fillers. The soluble metal salt and sodium water glass equation are as follows (take MgCl2 as an example) : Na2O? NSiO2 + mH2O + MgCl22NaCl + Mg (OH) 2 left + nSiO2? (m - 1) H2O has been studied deeply in sodium silicate glass.
In 1987 and 1991, two series of coatings were developed, and the dosage of polyvinyl alcohol was reduced to 16kg. T coatings, all performance indicators meet or exceed 106 paint ministry standards.
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.
When modified with calcium salt, it is not necessary to use the water glass of mirabilite, since this kind of water glass contains a lot of so2-4. Because the 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 so2-4 produce CaSO4 instead of Ca (OH) 2, resulting in a decrease in viscosity, poor adhesion, and powder coating.
Due to the low price of mirabilia, the majority of water glass used in township manufacturers is used in mirabilite, so the method of calcium salt modification is restricted in use.
In addition to the formation of silicate sol, the white Ca (OH) 2 precipitation is produced when the calcium salt is modified with the water glass made of soda. The solubility of Ca (OH) 2 as the temperature decreases (0 ℃ S = 0.185 g? 100 ml water, 100 ℃ S = 0.077 g? 100ml water), the temperature in the paint can be higher than room temperature, so the paint from the reaction tank can return to the surface at room temperature.
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
The metal oxide has zinc oxide, magnesium oxide, calcium oxide and so on. The soluble metal salts are zinc, calcium, magnesium, aluminum and other polyvalent metal carbonate, sulfate and chloride.
The metal oxide and soluble metal salt crosslinking agent and sodium water glass reaction, in addition to the formation of silicic acid sol, also produced an insoluble white gelatinous precipitation. This kind of precipitation not only has a good suspension, but also has certain covering ability.
Therefore, the modification of such metal oxide and soluble metal salt crosslinking agent not only improves the water resistance of coating, but also can save a certain amount of polyvinyl alcohol and fillers. The soluble metal salt and sodium water glass equation are as follows (take MgCl2 as an example) : Na2O? NSiO2 + mH2O + MgCl22NaCl + Mg (OH) 2 left + nSiO2? (m - 1) H2O has been studied deeply in sodium silicate glass.
In 1987 and 1991, two series of coatings were developed, and the dosage of polyvinyl alcohol was reduced to 16kg. T coatings, all performance indicators meet or exceed 106 paint ministry standards.
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.
When modified with calcium salt, it is not necessary to use the water glass of mirabilite, since this kind of water glass contains a lot of so2-4. Because the 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 so2-4 produce CaSO4 instead of Ca (OH) 2, resulting in a decrease in viscosity, poor adhesion, and powder coating.
Due to the low price of mirabilia, the majority of water glass used in township manufacturers is used in mirabilite, so the method of calcium salt modification is restricted in use.
In addition to the formation of silicate sol, the white Ca (OH) 2 precipitation is produced when the calcium salt is modified with the water glass made of soda. The solubility of Ca (OH) 2 as the temperature decreases (0 ℃ S = 0.185 g? 100 ml water, 100 ℃ S = 0.077 g? 100ml water), the temperature in the paint can be higher than room temperature, so the paint from the reaction tank can return to the surface at room temperature.
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
When using the paint - 4 cup viscometer to control the thin consistency of the paint, the temperature should be at 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 solubility of the precipitation of Al (OH) 3 is not changed with temperature, the paint is not returned to dilute phenomena, and the thin consistency is easy to control. During the modification of aluminum salt, the control of feeding time is crucial, because the solubility product of the amorphous Al (OH) 3 is very small (Ksp = 1.3 x 10-33), so the trend of positive reaction in the modification is very large.
If the water glass is delayed, the aluminum salt will react with the water glass of modified polyvinyl alcohol, which will destroy the modification of polyvinyl alcohol, thus causing the coating viscosity to be greatly reduced and 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.
The crosslinking temperature of crosslinking agent has a lot to do with the heat resistance of crosslinking. Similarly, in the same crosslinking agent, although the same functional group has the same function, the properties and crosslinking properties are different due to different chemical structures. Therefore, it is important to understand the characters and characteristics of different polyamines cross-linking agents with the same functional base and different chemical structures.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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