News Details
Hexadecyl mercaptan paint crosslinking agent
2017-7-31 17:27:49
Hexadecyl mercaptan paint crosslinking agent
The crosslinking effect of hexanthiol coating crosslinking agent. The adhesive was prepared with hexanthiol as crosslinking agent and then quickly mixed in the 30s.
In a small amount of tertiary amine under the action of crosslinking promoter, six yuan mercaptan crosslinking agent at 0 ℃ and 25 ℃ can be crosslinked EP, and in the 25 ℃ when the crosslinking rate faster; Under the same crosslinked temperature condition, the crosslinking rate of each formula was formulated with formula 1 > formula 2 > formula 3, namely, the activity size of the tertiary amine crosslinking promoter was the DMP - 30 > benzyl dimethylamine > ethanolamine.
The hydroxymethyl esterification rate of pentaerythritol was improved by improved synthesis process. The optimum condition for synthesis of PTM is: reaction temperature is 115 ℃, reaction medium for toluene, SAP for molecular sieve, w (molecular sieve) = 30% (relative to the total monomer reaction); The reaction method was to dehydrate 2.5 h after the reaction of toluene recirculation was 2.5 h.
The hexadecyl sulfide crosslinking agent is able to cross the EP at low temperature, and some properties (such as crosslinking rate, viscosity and resin compatibility) have exceeded the same kind of imported products. Therefore, the crosslinking agent can be used as an alternative to imported products and is expected to be widely used in the adhesive field.
The effect of temperature and medium on the esterification rate of hydroxymethyl. Pentaerythritol with mercapto propionic acid reaction is reversible reaction, reaction in the process of producing water, use water and reaction medium form azeotropic principle, can be generated constantly to remove water, so that the esterification reaction to the right, therefore, the choice of the reaction medium is very important. The reaction medium is different, and its reaction temperature is different.
This experiment investigates the benzene (boiling point 85 ℃), toluene (boiling point 115 ℃) and xylene (boiling point 140 ℃), three kinds of reaction medium on hydroxyl methyl esterification rate.
The esterification rate of hydroxymethyl was highest when the reaction medium was toluene. When the reaction medium was benzene, the esterification rate of hydroxymethyl was the lowest. This is due to the highest efficiency of toluene in addition to water, moderate reaction temperature (115 ℃), the product is colorless transparent liquid viscous; When it comes to reaction medium for xylene, products for the orange yellow viscous liquid, due to its high reaction temperature (140 ℃), the side effects tend to produce (such as dehydration of alcohol, ester hydrolysis, etc.), adverse to the esterification reaction. Therefore, choose toluene as reaction medium, is suitable when the reaction temperature is about 115 ℃.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
The crosslinking effect of hexanthiol coating crosslinking agent. The adhesive was prepared with hexanthiol as crosslinking agent and then quickly mixed in the 30s.
In a small amount of tertiary amine under the action of crosslinking promoter, six yuan mercaptan crosslinking agent at 0 ℃ and 25 ℃ can be crosslinked EP, and in the 25 ℃ when the crosslinking rate faster; Under the same crosslinked temperature condition, the crosslinking rate of each formula was formulated with formula 1 > formula 2 > formula 3, namely, the activity size of the tertiary amine crosslinking promoter was the DMP - 30 > benzyl dimethylamine > ethanolamine.
The hydroxymethyl esterification rate of pentaerythritol was improved by improved synthesis process. The optimum condition for synthesis of PTM is: reaction temperature is 115 ℃, reaction medium for toluene, SAP for molecular sieve, w (molecular sieve) = 30% (relative to the total monomer reaction); The reaction method was to dehydrate 2.5 h after the reaction of toluene recirculation was 2.5 h.
The hexadecyl sulfide crosslinking agent is able to cross the EP at low temperature, and some properties (such as crosslinking rate, viscosity and resin compatibility) have exceeded the same kind of imported products. Therefore, the crosslinking agent can be used as an alternative to imported products and is expected to be widely used in the adhesive field.
The effect of temperature and medium on the esterification rate of hydroxymethyl. Pentaerythritol with mercapto propionic acid reaction is reversible reaction, reaction in the process of producing water, use water and reaction medium form azeotropic principle, can be generated constantly to remove water, so that the esterification reaction to the right, therefore, the choice of the reaction medium is very important. The reaction medium is different, and its reaction temperature is different.
This experiment investigates the benzene (boiling point 85 ℃), toluene (boiling point 115 ℃) and xylene (boiling point 140 ℃), three kinds of reaction medium on hydroxyl methyl esterification rate.
The esterification rate of hydroxymethyl was highest when the reaction medium was toluene. When the reaction medium was benzene, the esterification rate of hydroxymethyl was the lowest. This is due to the highest efficiency of toluene in addition to water, moderate reaction temperature (115 ℃), the product is colorless transparent liquid viscous; When it comes to reaction medium for xylene, products for the orange yellow viscous liquid, due to its high reaction temperature (140 ℃), the side effects tend to produce (such as dehydration of alcohol, ester hydrolysis, etc.), adverse to the esterification reaction. Therefore, choose toluene as reaction medium, is suitable when the reaction temperature is about 115 ℃.
Chinese name: Diethyl toluene diamine(DETDA)Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
SAP species effects on hydroxyl methyl esterification rate Pentaerythritol hydroxyl can with carboxyl in mercapto propionic acid in the esterification reaction of water, so you must choose the appropriate SAP eliminate the water in the reaction process, the reaction to the right as soon as possible. The selection of absorbent must consider its performance, use, reversible decomposition temperature, water absorption efficiency, price and acid base.
This is because some of the water-absorbent agents are effective at low temperature, resulting in a reversible decomposition of the hydrate at high temperature. Some absorbent water is inefficient, while some of them are more expensive.
The three main types of water-absorbent are: acid absorbent, such as strong H2SO4, P2O5 and silica gel; Alkaline absorbent, such as solid caustic soda, lime and alkali lime; Neutral absorbent, such as CaCl2, MgSO4, etc.
This experiment on the premise of other conditions remain the same, by investigating the Na2SO4, molecular sieve, CaCl2 and MgSO4 (same) for the amount of four kinds of typical SAP effects on hydroxyl methyl esterification rate, picked out a proper SAP.
No water Na2SO4 has the worst absorption effect; Waterless MgSO4 has the best absorption effect, but its price is more expensive and the grain is too fine. The water absorption effect of molecular sieve and anhydrous CaCl2 is good, but the price of molecular sieve is relatively low and can be regenerated easily. Therefore, it is more appropriate to choose molecular sieves as water absorbent.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
SAP species effects on hydroxyl methyl esterification rate Pentaerythritol hydroxyl can with carboxyl in mercapto propionic acid in the esterification reaction of water, so you must choose the appropriate SAP eliminate the water in the reaction process, the reaction to the right as soon as possible. The selection of absorbent must consider its performance, use, reversible decomposition temperature, water absorption efficiency, price and acid base.
This is because some of the water-absorbent agents are effective at low temperature, resulting in a reversible decomposition of the hydrate at high temperature. Some absorbent water is inefficient, while some of them are more expensive.
The three main types of water-absorbent are: acid absorbent, such as strong H2SO4, P2O5 and silica gel; Alkaline absorbent, such as solid caustic soda, lime and alkali lime; Neutral absorbent, such as CaCl2, MgSO4, etc.
This experiment on the premise of other conditions remain the same, by investigating the Na2SO4, molecular sieve, CaCl2 and MgSO4 (same) for the amount of four kinds of typical SAP effects on hydroxyl methyl esterification rate, picked out a proper SAP.
No water Na2SO4 has the worst absorption effect; Waterless MgSO4 has the best absorption effect, but its price is more expensive and the grain is too fine. The water absorption effect of molecular sieve and anhydrous CaCl2 is good, but the price of molecular sieve is relatively low and can be regenerated easily. Therefore, it is more appropriate to choose molecular sieves as water absorbent.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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