News Details
The hydrazine coating crosslinking agent
2017-6-22 12:17:18
The hydrazine coating crosslinking agent
The carbonyl compound (aldehydes) can react with acylhydrazine and amino in the conditions of ph5-7, and the reaction is faster than the amino group. Such crosslinking agents can be used for site-specific crosslinking reactions.
The carbonyl group contained in the protein molecule is not very stable, but the polysaccharide chain is oxidized with sodium iodate and then the neighboring hydroxyl oxide is oxidized into an aldehyde or ketone group. Usually such oxidation reaction are in a light-free 0-4 ℃ conditions, so as to avoid the occurrence of adverse events. The hydrazide is then added to form the hydra bond.
This cross-linking reaction is mainly used for the modification of antibodies, since the Fc segment of the antibody usually contains carbohydrates. 0 ℃, 1 tendency/L sodium periodate condition, the oxidation reaction is limited to sialic acid residues. If the concentration increases to 10 mmol/L levels, other carbohydrates in the protein molecules can also react.
Need to review the previous content: spent a lot of space to talk about film forming additive, the rheological additives, pH regulator and flow ping agent, only to solve three problems: fast dry, proper rheological curve and flow property. In fact, the fast drying has the limit and limit, so the rheological curve is very important. The ideal recipe also needs to start from these aspects, especially the rheological curve, which we assume as follows:
The viscosity of the system is provided by the rheological additives as far as possible, have a certain thixotropy, and after the sag resistance need, thickening effect disappears, the viscosity of the coating also don't too high, so as not to affect the filter;
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).
Film-forming additives except as described in the second quarter, also need to be entered the stage of high solid content in the system as far as possible to reduce the system viscosity (similar to the synthesis method of the PU prepolymer of NMP), medium and slow evaporation film forming additives must be hydrophilic, shrinkage in the process of emulsion particles to ensure the film surface as much as possible to keep smooth, hard, to better move, for film more smooth;
In addition, for packing selection, it is also bold to assume that the particle size filler can achieve a better orientation effect. Arrange packing if there are two pieces of up and down, there must be a lot of emulsion particles, between them these emulsion particles must not very evenly distributed, in the process of coating the contraction, the emulsion particles will tend to be evenly distributed as possible, this is a question of emulsion particles move.
Under the condition of the water system flow leveling time is short, mobile distance as short as possible will seem more important, in 8 of 12 mu mu and packing, for example, the center of the emulsion particle filler surface if you want to move out the moving distance is increased by 50%, the actual system of emulsion particle movement is more complex than that, so the gap between actual effect is not as big as the previous data.
In terms of improving the performance of waterborne wood paint, the performance of water-based wood lacquers, such as adhesion, hardness, alcohol-resistance, friction, etc., is still very much in doubt. But now most engineers don't have such concerns, theoretically emulsion due to higher molecular weight (usually hundreds of thousands to millions), so you can get the physical and chemical properties, better than oily system. But solvent has very rich raw materials, technology research and development personnel can through the special raw material choice, or additives for high performance coatings, water-based products are not very rich, also does not have the super outstanding performance emulsion can choose, the correct use of film-forming agent, collocation is suitable for the additives to improve the system is viable.
In the pigment printing, A large amount of thickening agent and thinner for emulsion paste A pulp, it is 70% of the oil is quickly stirred and emulsified, using it to make the color deep. There is no substitute for the several thickening agents currently in use. But its disadvantage is that it pollutes the air and has a smell of oil.
The synthetic thickening agent has non-ionic and anionic types, and the non-ionic thickening agent is less effective in the use of the thickening agent, and also has some effect on fastness. Currently, most of the use is anion thickener, but its feel, fastness, and freshness are not equal to emulsified paste A. It is very resistant to electrolyte chemicals and is one of the commonly used thickening agents.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
The carbonyl compound (aldehydes) can react with acylhydrazine and amino in the conditions of ph5-7, and the reaction is faster than the amino group. Such crosslinking agents can be used for site-specific crosslinking reactions.
The carbonyl group contained in the protein molecule is not very stable, but the polysaccharide chain is oxidized with sodium iodate and then the neighboring hydroxyl oxide is oxidized into an aldehyde or ketone group. Usually such oxidation reaction are in a light-free 0-4 ℃ conditions, so as to avoid the occurrence of adverse events. The hydrazide is then added to form the hydra bond.
This cross-linking reaction is mainly used for the modification of antibodies, since the Fc segment of the antibody usually contains carbohydrates. 0 ℃, 1 tendency/L sodium periodate condition, the oxidation reaction is limited to sialic acid residues. If the concentration increases to 10 mmol/L levels, other carbohydrates in the protein molecules can also react.
Need to review the previous content: spent a lot of space to talk about film forming additive, the rheological additives, pH regulator and flow ping agent, only to solve three problems: fast dry, proper rheological curve and flow property. In fact, the fast drying has the limit and limit, so the rheological curve is very important. The ideal recipe also needs to start from these aspects, especially the rheological curve, which we assume as follows:
The viscosity of the system is provided by the rheological additives as far as possible, have a certain thixotropy, and after the sag resistance need, thickening effect disappears, the viscosity of the coating also don't too high, so as not to affect the filter;
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).
Film-forming additives except as described in the second quarter, also need to be entered the stage of high solid content in the system as far as possible to reduce the system viscosity (similar to the synthesis method of the PU prepolymer of NMP), medium and slow evaporation film forming additives must be hydrophilic, shrinkage in the process of emulsion particles to ensure the film surface as much as possible to keep smooth, hard, to better move, for film more smooth;
In addition, for packing selection, it is also bold to assume that the particle size filler can achieve a better orientation effect. Arrange packing if there are two pieces of up and down, there must be a lot of emulsion particles, between them these emulsion particles must not very evenly distributed, in the process of coating the contraction, the emulsion particles will tend to be evenly distributed as possible, this is a question of emulsion particles move.
Under the condition of the water system flow leveling time is short, mobile distance as short as possible will seem more important, in 8 of 12 mu mu and packing, for example, the center of the emulsion particle filler surface if you want to move out the moving distance is increased by 50%, the actual system of emulsion particle movement is more complex than that, so the gap between actual effect is not as big as the previous data.
In terms of improving the performance of waterborne wood paint, the performance of water-based wood lacquers, such as adhesion, hardness, alcohol-resistance, friction, etc., is still very much in doubt. But now most engineers don't have such concerns, theoretically emulsion due to higher molecular weight (usually hundreds of thousands to millions), so you can get the physical and chemical properties, better than oily system. But solvent has very rich raw materials, technology research and development personnel can through the special raw material choice, or additives for high performance coatings, water-based products are not very rich, also does not have the super outstanding performance emulsion can choose, the correct use of film-forming agent, collocation is suitable for the additives to improve the system is viable.
In the pigment printing, A large amount of thickening agent and thinner for emulsion paste A pulp, it is 70% of the oil is quickly stirred and emulsified, using it to make the color deep. There is no substitute for the several thickening agents currently in use. But its disadvantage is that it pollutes the air and has a smell of oil.
The synthetic thickening agent has non-ionic and anionic types, and the non-ionic thickening agent is less effective in the use of the thickening agent, and also has some effect on fastness. Currently, most of the use is anion thickener, but its feel, fastness, and freshness are not equal to emulsified paste A. It is very resistant to electrolyte chemicals and is one of the commonly used thickening agents.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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