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Amino polyether polyol for low-boiling-point low-density quick-release system, preparation method, rigid polyurethane foam prepared from amino polyether polyol and preparation method of rigid polyurethane foam

A polyether polyol, amino polyether technology, applied in the field of polyols, can solve the problems of bulging and debonding, poor foam curing, short foam curing time, etc. Effect

Pending Publication Date: 2021-01-15
WANHUA CHEM NINGBO RONGWEI POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, with the significant reduction in demoulding time and pouring volume, the foam curing time is short, the surface of the foam is severely sticky, and the adhesion to the board is insufficient, especially under the condition of high temperature and high humidity. The insulation layer of many refrigerators has a phenomenon of batch separation during transportation and high temperature, high humidity, and low temperature and high humidity areas. This is caused by insufficient curing of the foam itself. The main reason for this phenomenon is the low boiling point foaming agent system. A large amount of physical blowing agent H 2 O, the presence of water leads to the production of polyurea, polyurea will flow on the surface of the foam, resulting in poor foam ripening, which is the bottleneck encountered in the prior art when using low-boiling point, low-density and quick-release systems
[0006] Therefore, there is still a need for a new starter and the polyether polyol prepared with it, which is suitable for low-boiling point, low-density and fast-release foaming systems, and can overcome and solve the problem of excessive water, poor aging, and even delamination in the existing system. The problem

Method used

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  • Amino polyether polyol for low-boiling-point low-density quick-release system, preparation method, rigid polyurethane foam prepared from amino polyether polyol and preparation method of rigid polyurethane foam
  • Amino polyether polyol for low-boiling-point low-density quick-release system, preparation method, rigid polyurethane foam prepared from amino polyether polyol and preparation method of rigid polyurethane foam
  • Amino polyether polyol for low-boiling-point low-density quick-release system, preparation method, rigid polyurethane foam prepared from amino polyether polyol and preparation method of rigid polyurethane foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] 1) Add water (17775g, 987.5mol) and 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine (1222g, 2.51mol) into the reactor, nitrogen replacement Pressure test, start stirring and heat to 100°C. Add 340 g of propylene oxide into the reactor by metering a flow rate of 650 g / h. Then the reaction was continued for 1 hour, and then the temperature was raised to 125° C. for another 1 hour.

[0065] 2) Vacuum and remove water at 115°C for 2 hours. Add remaining propylene oxide 410g by metering flow rate 750g / h. After continuing the reaction for 2 hours, the temperature was raised to 145° C. for another 3 hours to obtain the final product amino polyether polyol. In the obtained polyol, x and y are 0 and 6 respectively, and the hydroxyl value is 450 mgKOH / g in the titration test using the method of phthalic anhydride esterification, and the functionality is 6 by calculation. The NMR data are as follows: 1H NMR (300MHz, DMSO) δ=12.74(s, 3H), 7.90(d, J=4.8Hz, 6H), 7.39(d, J=4.8Hz...

Embodiment 2

[0068] 1) Add water (14150g, 786.1mol) and 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine (1205g, 2.48mol) into the reactor, nitrogen replacement Pressure test, start stirring and heat to 90°C. Measured at a flow rate of 600g / h, add 300g of ethylene oxide and propylene oxide into the reactor at a mass ratio of 3:7. Then continue to react for 2.5h, then raise the temperature to 120°C and react for another 2.5h.

[0069] 2) Vacuum and remove water at 100°C for 1 hour. According to flow rate 400g / h metering add remaining epoxide 360g, the mass ratio of ethylene oxide and propylene oxide is 3:7. After continuing the reaction for 2.5 hours, the temperature was raised to 140° C. for another 3 hours to obtain the final product amino polyether polyol. In the obtained polyol, x and y are 2 and 5 respectively, and the hydroxyl value is 500 mgKOH / g through titration test by the method of phthalic anhydride esterification, and the calculated functionality is 5.1. The NMR data are a...

Embodiment 3

[0073] A low-density quick-release 134a system polyurethane rigid foam, the raw material composition:

[0074] The mass ratio of combined polyether to foaming agent and polyisocyanate is 100:20:150, specifically:

[0075] The composition of the combined polyether is as follows: 91.6 parts of polyether composition, 3 parts of surfactant, 3.4 parts of composite catalyst, and 2.0 parts of distilled water;

[0076]Foaming agent (mass ratio): CP: 245fa: 134a = 11:7:2;

[0077] Polyisocyanate: Polymerized MDI, Wanhua PM-200 150 parts.

[0078] In combination polyether:

[0079] The polyether composition consists of 15 parts by weight of 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine polyether polyol (prepared in Example 2): sucrose polyether polyol Alcohol (hydroxyl value 410mgKOH / g, functionality 6.5) 51.6 parts, sorbitan polyether polyol (hydroxyl value 432mgKOH / g, functionality 5.8) 20 parts, glycerin polyether polyol (hydroxyl value 192mgKOH / g, functionality is 2.3) 5 pa...

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Abstract

The invention relates to amino polyether polyol for a low-boiling-point low-density quick-release system, a preparation method of the amino polyether polyol and rigid polyurethane foam prepared by using the amino polyether polyol. The amino polyether polyol is prepared by taking 2,4,6-tris[(p-carboxyphenyl)amino]-1,3,5-triazine as an initial raw material and reacting the initial raw material witholefin oxide, and the structure of the amino polyether polyol is shown as a formula I, in the formula, x is any integer from 0 to 5, and y is any integer from 0 to 8. The amino polyether polyol disclosed by the invention can be used as a part of physical foaming agent due to a special structural form, carboxyl and CO2 generated by reaction with MDI, so that the use amount of H2O is reduced, the curing is improved, and the problems of high water content, poor curing and even delamination of a low-boiling-point low-density quick-release rigid polyurethane foam system in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of polyols, and in particular relates to a novel amino polyether polyol used in a low-boiling point and low-density quick-release system, a preparation method thereof, and a polyurethane rigid foam prepared using the same and a preparation method thereof. Background technique [0002] Hydrochlorofluorocarbon blowing agents currently used for polyurethane rigid foam have a detrimental effect on the ozone layer. HCFC-141b is the most widely used hydrochlorofluorocarbon blowing agent. China will ban the use of HCFC-141b in 2020. Currently, it can Blowing agents used to replace HCFC-141b include full water, cyclopentane, HFC-245fa, 134a, 152a, R600 and HFO-1233zd (LBA for short). [0003] At present, the most commonly used foaming system in China is CP system and CP and 245fa mixed foaming agent system, but with the rise of labor costs and raw material prices, the cost of refrigerators is also rising. At presen...

Claims

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Application Information

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IPC IPC(8): C08G65/26C08G18/48C08G18/50C08J9/14C08G101/00C08L75/08
CPCC08G65/263C08J9/146C08J9/141C08J9/149C08G18/482C08G18/4883C08G18/5063C08G18/4829C08J2203/142C08J2203/14C08J2203/202C08J2375/08
Inventor 郑礼倩叶俊朱霞林
Owner WANHUA CHEM NINGBO RONGWEI POLYURETHANE
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