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The effect of coating crosslinking agent on the performance of adhesive
2017-7-31 17:27:56
The effect of coating crosslinking agent on the performance of adhesive
The experiment shows that the dosage of crosslinking agent has great influence on the adhesive system. The combination of the crosslinking agent prepared before and EP was mixed, the ratio of EP and crosslinking agent was changed, the gel time was tested, and the shear strength was tested at room temperature after 7 days.
The effect of crosslinking agent on the performance of adhesive is shown: the more the crosslinking agent is added, the faster EP crosslinking will be, and the shear strength of the adhesive will reach the maximum when the dosage of the crosslinking agent is 30% of EP quality. Smaller because of the relative molecular mass of the crosslinking agent, and crosslinking agent also contain other small molecular substances, dosage too much will affect the adhesive strength and toughness, it is difficult to form macromolecular three-dimensional structure, and too little dosage can make crosslinking reaction is incomplete, hardness and strength is not enough.
Therefore, the dosage of the crosslinking agent is 30% of the EP quality, the EP can be cross-linked at room temperature at 5 min, and the shear strength reaches 19 MPa, which is increased by 5 ~ 10 MPa compared with the amine crosslinking agent.
The determination of reaction parameters 2.2.1 n - (OH)/n (P2O5) polyol and polyphosphoric acid under certain conditions can occur esterification reaction [reaction in type (1)], the product of phosphoric acid monoester, double phosphate ester, the unreacted alcohol and a small amount of a mixture of phosphoric acid.
The proportion of raw materials directly affects the composition of the product, so the proper proportion of raw materials is very important. Choice of n-butyl alcohol and poly (caprolactone ternary alcohol mole ratio was 1.0, 1.0, 4 h under 75 ℃ condition reaction. Can be seen from table 1: with n - (OH)/n (P2O5), double ester content reduce, monoester content transformation after the first increase and decrease, in the n - (OH)/n (P2O5) reaches the maximum value was 2.0:1.0.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
The experiment shows that the dosage of crosslinking agent has great influence on the adhesive system. The combination of the crosslinking agent prepared before and EP was mixed, the ratio of EP and crosslinking agent was changed, the gel time was tested, and the shear strength was tested at room temperature after 7 days.
The effect of crosslinking agent on the performance of adhesive is shown: the more the crosslinking agent is added, the faster EP crosslinking will be, and the shear strength of the adhesive will reach the maximum when the dosage of the crosslinking agent is 30% of EP quality. Smaller because of the relative molecular mass of the crosslinking agent, and crosslinking agent also contain other small molecular substances, dosage too much will affect the adhesive strength and toughness, it is difficult to form macromolecular three-dimensional structure, and too little dosage can make crosslinking reaction is incomplete, hardness and strength is not enough.
Therefore, the dosage of the crosslinking agent is 30% of the EP quality, the EP can be cross-linked at room temperature at 5 min, and the shear strength reaches 19 MPa, which is increased by 5 ~ 10 MPa compared with the amine crosslinking agent.
The determination of reaction parameters 2.2.1 n - (OH)/n (P2O5) polyol and polyphosphoric acid under certain conditions can occur esterification reaction [reaction in type (1)], the product of phosphoric acid monoester, double phosphate ester, the unreacted alcohol and a small amount of a mixture of phosphoric acid.
The proportion of raw materials directly affects the composition of the product, so the proper proportion of raw materials is very important. Choice of n-butyl alcohol and poly (caprolactone ternary alcohol mole ratio was 1.0, 1.0, 4 h under 75 ℃ condition reaction. Can be seen from table 1: with n - (OH)/n (P2O5), double ester content reduce, monoester content transformation after the first increase and decrease, in the n - (OH)/n (P2O5) reaches the maximum value was 2.0:1.0.
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
When n - (OH)/n (P2O5) is less than 2.0, 2.0, much polyphosphoric acid dosage is too large, leading to excess residual phosphate, because free phosphoric acid can react with EP quickly generate solid, so make the gel time shorter. But this solid does not have the characteristics of adhesive, so it is necessary to reduce the content of residual phosphoric acid.
When n (-oh)/n (P2O5) is greater than 2.0:1.0, the polyphosphate dosage is low, the esterification reaction is not complete, and there is an unresponsive n-butanol in the system, which makes the gel time grow longer.
Therefore, gel time increases with n (-oh)/n (P2O5), and when n (-oh)/n (P2O5) is 2.0:1.0, it can reach a higher conversion rate and gel time is suitable.
Reaction temperature had a great influence on the esterification reaction, proper higher reaction temperature can improve the reaction rate, but higher temperature can make the product color deepened, and the temperature is too low, can prolong the reaction time, and the product viscosity.
Comprehensive consideration, choose the reaction temperature is 65 ~ 85 ℃, n-butyl alcohol and poly (caprolactone ternary alcohol mole ratio and n - (OH)/n (P2O5) were 1.0, 10.0, 2.0, 1.0, 4 h. From table 2, when reaction temperature is 75 ℃, the minimum double phosphate ester content, monoester content and the highest conversion rate, minimum residual phosphate content. The time of gel time was basically unchanged, indicating that the time difference between the phosphoric acid single, the diester and the phosphate was different from that of EP. As a result, the reaction temperature to 75 ℃.
The effect of reaction mode on hydroxymethyl esterification rate. The reaction of pentaerythritol with mercapto propionic acid belongs to the typical esterification reversible reaction, so in the process of reaction, it should be as far as possible, in addition to all by-products (water), the equilibrium to the right, in order to improve the reaction rate of monomer hydroxy methyl esterification of pentaerythritol. On the premise of other conditions remain unchanged (i.e., with toluene as reaction medium, 115 ℃ reaction is the same time), just change the responses.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
When n - (OH)/n (P2O5) is less than 2.0, 2.0, much polyphosphoric acid dosage is too large, leading to excess residual phosphate, because free phosphoric acid can react with EP quickly generate solid, so make the gel time shorter. But this solid does not have the characteristics of adhesive, so it is necessary to reduce the content of residual phosphoric acid.
When n (-oh)/n (P2O5) is greater than 2.0:1.0, the polyphosphate dosage is low, the esterification reaction is not complete, and there is an unresponsive n-butanol in the system, which makes the gel time grow longer.
Therefore, gel time increases with n (-oh)/n (P2O5), and when n (-oh)/n (P2O5) is 2.0:1.0, it can reach a higher conversion rate and gel time is suitable.
Reaction temperature had a great influence on the esterification reaction, proper higher reaction temperature can improve the reaction rate, but higher temperature can make the product color deepened, and the temperature is too low, can prolong the reaction time, and the product viscosity.
Comprehensive consideration, choose the reaction temperature is 65 ~ 85 ℃, n-butyl alcohol and poly (caprolactone ternary alcohol mole ratio and n - (OH)/n (P2O5) were 1.0, 10.0, 2.0, 1.0, 4 h. From table 2, when reaction temperature is 75 ℃, the minimum double phosphate ester content, monoester content and the highest conversion rate, minimum residual phosphate content. The time of gel time was basically unchanged, indicating that the time difference between the phosphoric acid single, the diester and the phosphate was different from that of EP. As a result, the reaction temperature to 75 ℃.
The effect of reaction mode on hydroxymethyl esterification rate. The reaction of pentaerythritol with mercapto propionic acid belongs to the typical esterification reversible reaction, so in the process of reaction, it should be as far as possible, in addition to all by-products (water), the equilibrium to the right, in order to improve the reaction rate of monomer hydroxy methyl esterification of pentaerythritol. On the premise of other conditions remain unchanged (i.e., with toluene as reaction medium, 115 ℃ reaction is the same time), just change the responses.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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