Aliphatic series polyisocyanurate preparation method
A technology of isocyanurate and isocyanate, which is applied in the field of preparation of aliphatic isocyanate trimer, can solve problems such as easy yellowing of adducts, high product viscosity, and large reaction heat release, so as to increase the dispersion effect and solve the problem of Excessive heat release, good dispersion effect
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[0027] Example 1
[0028] Use nitrogen to remove a small amount of air and water vapor in the HDI monomer, and add 0.01g / min of composite catalyst (the mass ratio of DABCO TMR to tert-butanol is 4:6) and 100g / min of HDI monomer to the preset to In a straight tube reactor with a length of 80 cm and an inner diameter of 1 cm manufactured by Wanhua Polyurethane Company at 40°C, the residence time of the reaction raw materials in the tube reactor is about 5 minutes. After 30 minutes, the continuous catalyst and monomer will be stopped. The NCO and viscosity are measured at the sampling point; the reaction liquid then enters a 5-liter reactor equipped with a stirrer, nitrogen inlet, and automatic temperature control system. The temperature of the reactor is raised to 30℃ in advance. , Relying on the reaction exotherm in the tubular reactor to increase the reaction temperature of the second reactor to 50°C, react in the second reactor for 3 hours to obtain the corresponding trimer prod...
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[0029] Example 2
[0030] Use nitrogen to remove a small amount of air and water vapor from the HDI monomer, and add 0.01g / min composite catalyst (the mass ratio of DABCO TMR to tert-butanol is 1:1) and 100g / min HDI monomer to the preset to 40 In a straight tube reactor with a length of 60 cm and an inner diameter of 1 cm manufactured by Wanhua Polyurethane Company, the residence time of the reaction raw materials in the tube reactor is about 3 minutes. After 30 minutes, the continuous catalyst and monomer will be stopped. Feed the material and check the NCO and viscosity at the set sampling point; the reaction liquid then enters a 5-liter reactor equipped with a stirrer, nitrogen inlet, and automatic temperature control system. The temperature of the reactor is raised to 40°C in advance. Depending on the reaction exotherm in the tubular reactor, the reaction temperature of the second reactor was increased to 50°C, and the reaction was carried out in the second reactor for 4 hou...
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