Preparation method of environment-friendly polymeric isocyanate glue

Abstract

The invention discloses a preparation method of environment-friendly polymeric isocyanate glue, which comprises the steps of photochemical reaction, high temperature scavenging and reduced pressure distillation. On the premise of not influencing product quality, ethyl acetate is selected as an organic solvent component, and the produced environment-friendly polymeric isocyanate glue can not only enhance the environmental protection performance of products, but also greatly improve the bond strength of the products.

Description

technical field

[0001] The invention relates to a preparation method of an environment-friendly polyisocyanate glue. Background technique

[0002] Polyisocyanate glue, commonly known as Triphenylmethane triisocyanate, is mainly used for bonding rubber to metal, rubber to rubber, rubber to some non-metals, and some non-metals to non-metals. Do textile auxiliaries. The product synthesis process is: triaminotriphenylmethane (C 19 h 19 N 3 ) is dissolved in organic solvents such as carbon tetrachloride, dichloromethane, benzene, chlorinated benzene, etc., and phosgene is introduced into the mixed solution to carry out photochemical reaction. The content of polyisocyanate in the product is 20%, and that of carbon tetrachloride, methylene chloride, benzene and organic solvent is 80%. The polyisocyanate glue produced by this process, because it contains toxic solvents, will cause serious pollution to the environment during use, and will also cause great harm to users. Organic...

Examples

Embodiment Construction

[0015] 1), photochemical reaction

[0016] In the low-temperature reaction kettle, dissolve triaminotriphenylmethane in chlorobenzene so that the weight percentage of triaminotriphenylmethane in the mixed solution is 21-23%, and wait until the temperature of the mixed solution drops to -5~-10°C When the temperature is high, phosgene is introduced to carry out low-temperature photochemical reaction; when the specific gravity of the low-temperature photochemical mixture reaches 1.2, it is transferred to a high-temperature reactor and the temperature is raised to 120-125°C, and then phosgene is introduced to carry out high-temperature photochemical reaction; Carry out high-temperature degassing when the weight content of polyisocyanate produced is greater than 10%;

[0017] 2), high temperature catch air

[0018] Control the high-temperature reaction liquid at 125-130°C, and use dry compressed air to drive out the excess phosgene and hydrogen chloride gas generated in the liquid...

technical field

[0001] The invention relates to a preparation method of an environment-friendly polyisocyanate glue. Background technique

[0002] Polyisocyanate glue, commonly known as Triphenylmethane triisocyanate, is mainly used for bonding rubber to metal, rubber to rubber, rubber to some non-metals, and some non-metals to non-metals. Do textile auxiliaries. The product synthesis process is: triaminotriphenylmethane (C 19 h 19 N 3 ) is dissolved in organic solvents such as carbon tetrachloride, dichloromethane, benzene, chlorinated benzene, etc., and phosgene is introduced into the mixed solution to carry out photochemical reaction. The content of polyisocyanate in the product is 20%, and that of carbon tetrachloride, methylene chloride, benzene and organic solvent is 80%. The polyisocyanate glue produced by this process, because it contains toxic solvents, will cause serious pollution to the environment during use, and will also cause great harm to users. Organic...

Examples

Embodiment Construction

[0015] 1), photochemical reaction

[0016] In the low-temperature reaction kettle, dissolve triaminotriphenylmethane in chlorobenzene so that the weight percentage of triaminotriphenylmethane in the mixed solution is 21-23%, and wait until the temperature of the mixed solution drops to -5~-10°C When the temperature is high, phosgene is introduced to carry out low-temperature photochemical reaction; when the specific gravity of the low-temperature photochemical mixture reaches 1.2, it is transferred to a high-temperature reactor and the temperature is raised to 120-125°C, and then phosgene is introduced to carry out high-temperature photochemical reaction; Carry out high-temperature degassing when the weight content of polyisocyanate produced is greater than 10%;

[0017] 2), high temperature catch air

[0018] Control the high-temperature reaction liquid at 125-130°C, and use dry compressed air to drive out the excess phosgene and hydrogen chloride gas generated in the liquid...

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