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

Active Publication Date: 2010-07-28
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the yellowing resistance of the trimer in the product placement is obviously better than that of biuret and other adduct products, but in the process of preparing the trimer, there are the following problems: the catalyst is easy to remain, which affects the later application ; The obtained adduct is easy to turn yellow, which affects the performance of the later product; the product obtained from the trimer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[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...

Example Embodiment

[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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PUM

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Abstract

An aliphatic series polyisocyanurate preparation method includes the following steps: isocyanate and complex catalytic system formed by quaternary ammonium salt and inert alcohol solvent are added to a static mixer to lead isocyanate to have polymerization reaction, and then the formed product flow is transferred to a dynamic reactor for continuing the polymerization reaction; the reaction solution obtained in the polymerization reaction is processed by a second-level evaporator to obtain polyisocyanurate product. The preparation method can well control the reaction activity of the catalyst, causes the trimerization of isocyanate to be carried out in mild conditions and accordingly obtains tripolymer products with very high quality.

Description

technical field [0001] The invention relates to a preparation method of aliphatic isocyanate trimer, in particular to a preparation method of aliphatic polyisocyanurate. Background technique [0002] As early as more than 100 years ago, the famous German scientist Hoffman discovered that three isocyanate groups can react to form isocyanurate. In the 1960s, the industrialization of Bayer's isocyanurate, its HDI trimer has a stable isocyanurate heterocyclic structure in the molecule, so it has low volatility, low toxicity, and good storage stability. Compared with biuret, it has more excellent weather resistance, heat resistance, light stability, low viscosity and high product hardness, so it is widely used in polyurethane materials. [0003] HDI isocyanurate can be used to prepare polyurethane coatings, which have good weather resistance, chemical stability and long pot life. The storage stability of HDI trimer is especially better than that of biuret. At the same time, th...

Claims

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Application Information

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IPC IPC(8): C07D251/34
Inventor 孙中平尚永华华卫琦王海影尹明辉王玉启石滨赵磊俞勇
Owner WANHUA CHEM GRP CO LTD
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