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A kind of polyisocyanate composition and preparation method thereof

A polyisocyanate and isocyanurate technology, applied in the field of isocyanates, can solve problems such as affecting product use, precipitation, and turbidity increase, and achieve the effects of reducing dosage, improving low temperature stability, and slowing decomposition

Active Publication Date: 2021-06-29
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Based on the low-viscosity polyisocyanate composition containing iminooxadiazinedione structure prepared by the prior art, it was found in the product evaluation process that the turbidity is prone to increase when stored at low temperature (such as -10°C). Precipitation phenomenon, which will seriously affect the use of products in low temperature areas

Method used

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  • A kind of polyisocyanate composition and preparation method thereof
  • A kind of polyisocyanate composition and preparation method thereof
  • A kind of polyisocyanate composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] 1000 g of HDI was placed in a round bottom flask equipped with a reflux condenser, a stirrer, a thermometer and a nitrogen inlet, wherein the bromine content of HDI was 10 ppm.

[0076] The above reaction system was heated to 80°C, and then a n-hexanol solution of 50wt% tetrabutylammonium difluoride was added dropwise as a catalyst (100ppm of acetone was added to the catalyst solution in advance), stirring continuously during the reaction process, and the temperature was raised during the reaction. The rate of catalyst addition controls the reaction temperature between 80-90°C. When the monomer conversion rate of the reaction liquid system is 30%, immediately add dibutyl phosphate equal to the molar amount of the catalyst to terminate, and the reaction time is 5 hours. Obtain the reaction solution.

[0077] Use a thin film evaporator to evaporate and remove unreacted monomers under the conditions of temperature 130° C. and absolute pressure 100 Pa, so that the content i...

Embodiment 2

[0081] 1000 g of HDI was placed in a round bottom flask equipped with a reflux condenser, a stirrer, a thermometer and a nitrogen inlet, wherein the HDI had a bromine content of 30 ppm.

[0082] The above reaction system was heated to 60°C, and then a n-octanol solution of 50wt% benzyltrimethylammonium fluoride as a catalyst was added dropwise (500ppm of acetone was added to the catalyst solution in advance), stirring continuously during the process, and the temperature rose during the reaction. Control the reaction temperature between 60-70°C by controlling the catalyst addition rate, when the monomer conversion rate of the reaction liquid system is 20%, immediately add dibutyl phosphate in an equimolar amount to the catalyst to terminate, and the reaction time is 10 hours to obtain a reaction solution.

[0083] Use a thin film evaporator to evaporate and remove unreacted monomers under the conditions of temperature 130° C. and absolute pressure 100 Pa, so that the content is...

Embodiment 3

[0087] 1000 g of HDI was placed in a round bottom flask equipped with a reflux condenser, a stirrer, a thermometer and a nitrogen inlet, wherein the HDI had a bromine content of 30 ppm.

[0088] The above reaction system was heated to 70°C, and then the catalyst 50wt% tetramethylammonium fluoride in 2-ethyl-1,3-hexanediol solution was added dropwise (1000ppm of 2-butanone was added to the catalyst solution in advance), the process During the reaction process, the temperature rises, and the reaction temperature is controlled between 70-80°C by controlling the catalyst addition rate. When the monomer conversion rate of the reaction liquid system is 15%, immediately add dibutyl phosphate in an equimolar amount to the catalyst. The termination was carried out, and the reaction time was 8 hours at this time to obtain a reaction liquid.

[0089] Use a thin film evaporator to evaporate and remove unreacted monomers under the conditions of temperature 130° C. and absolute pressure 100...

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Abstract

The present invention provides a polyisocyanate composition, which is polymerized from aliphatic isocyanate containing at least hexamethylene diisocyanate, containing isocyanurate group, uretdione group, oxadiazinetrione group and iminooxadiazinedione group, and the molar ratio of oxadiazinetrione group and isocyanurate group is (0.001‑0.01):1, and the sum of bromine content and fluorine content in the composition is not higher than 80ppm . The present invention also provides a preparation method of the above composition. The polyisocyanate composition described above is storage-stable at low temperatures.

Description

technical field [0001] The invention belongs to the field of isocyanates, and in particular relates to a polyisocyanate composition and a preparation method thereof. Background technique [0002] The polyisocyanate prepared by polymerization of aliphatic diisocyanate monomer has been widely used in the polyurethane coating or adhesive industry. The self-polymerization of diisocyanate can effectively reduce the harm of volatile isocyanate monomer to the human body. [0003] Diisocyanate monomers can be polymerized by themselves to obtain uretdione, oxadiazinetrione, iminooxadiazinedione and isocyanurate group structures. The four structures have their own characteristics, and their combination can affect the quality of the product. performance, its corresponding structure is as follows: [0004] [0005] R in the above structure 1 , R 2 and R 3 They may be the same or different, and represent the residue from which the NCO group has been removed from the diisocyanate m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/79
CPCC08G18/79C08G18/792C08G18/797C08G18/798
Inventor 刘伟石滨尚永华辛光震朱付林薛勇勇朱智诚王丹焦乾坤黎源
Owner WANHUA CHEM GRP CO LTD
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