3,4-diaminofurazan polyether polyol, preparation method, rigid polyurethane foam prepared from 3,4-diaminofurazan polyether polyol and preparation method

A technology of polyether polyol and polyurethane rigid foam is applied in the fields of 3,4-diaminofuroxa polyether polyol and preparation, low density and low conductivity 134a system rigid polyurethane foam and preparation thereof, and can solve the problem of HFC-134a. It can be widely used, prone to volatilization and escape, affecting the overall performance of the foam, etc., to achieve the effect of weakening the autocatalytic effect, benefiting strength and fluidity, optimizing strength and thermal conductivity

Active Publication Date: 2018-08-17
WANHUA CHEM NINGBO RONGWEI POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low boiling point of HFC-134a, it is easy to evaporate and escape in the early stage of the reaction. The loss of HFC-134a greatly affects the overall performance of the foam, so HFC-134a has not been widely used.

Method used

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  • 3,4-diaminofurazan polyether polyol, preparation method, rigid polyurethane foam prepared from 3,4-diaminofurazan polyether polyol and preparation method
  • 3,4-diaminofurazan polyether polyol, preparation method, rigid polyurethane foam prepared from 3,4-diaminofurazan polyether polyol and preparation method
  • 3,4-diaminofurazan polyether polyol, preparation method, rigid polyurethane foam prepared from 3,4-diaminofurazan polyether polyol and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A kind of preparation method of 3,4-diaminofurazol polyether polyol, the steps are:

[0065] 1) Add water (135g) and 3,4-diaminofurazol (530g) into the reaction kettle, replace with nitrogen to test pressure, start stirring and heat to 90°C to obtain 3,4-diaminofurazol aqueous solution, and then press the flow rate Add 1035g propylene oxide at 700g / h, autocatalyze the reaction for 1h, then raise the temperature to 115°C and carry out the aging reaction for 1h;

[0066] 2) Add 20g (concentration: 50wt%) aqueous potassium hydroxide solution to the system in step 1), dehydrate in vacuum at 110°C for 2h, then meter the remaining 970g of propylene oxide at a flow rate of 600g / h, continue the reaction for 1h, and then heat up to Reaction at 120°C for 1 hour;

[0067] 3) At this time, 35 g of phosphoric acid aqueous solution with a concentration of 50 wt % was added to remove K ions to obtain 3,4-diaminofurazal polyether polyol with a hydroxyl value of 346 mgKOH / g and a funct...

Embodiment 2

[0069] The preparation method of 3,4-diaminofurazol polyether polyol, the steps are:

[0070] 1) Add water (135g) and 3,4-diaminofurazol (530g) into the reaction kettle, replace with nitrogen to test the pressure, start stirring and heat to 90°C, and keep it for 1 hour to get 3,4-diaminofurazol Aqueous solution, then add 828g epoxy olefin (the mass ratio of propylene oxide to ethylene oxide is 8:2) according to the flow rate of 700g / h, autocatalyze the reaction for 2h, then heat up to 100°C and carry out the aging reaction for 2h;

[0071] 2) Add 20g (concentration is 50wt%) potassium hydroxide aqueous solution to step 1) system, vacuum dehydration at 110 ℃ for 2h, then add remaining epoxy olefin 776g (propylene oxide and ethylene oxide) according to flow rate 600g / h The mass ratio of alkane is 8:2), continue to react for 2h, then raise the temperature to 120°C for another 1h;

[0072] 3) At this time, 35 g of phosphoric acid aqueous solution with a concentration of 50 wt % w...

Embodiment 3

[0074] A low-density and low-conductivity HFC-134a system polyurethane rigid foam, raw material composition:

[0075] The mass ratio of combined polyether to foaming agent and polyisocyanate is 100:15:150, specifically:

[0076] The composition of the combined polyether is as follows: 91.4 parts of polyether composition, 3 parts of surfactant, 3.4 parts of composite catalyst, and 2.2 parts of distilled water;

[0077] Foaming agent: 11 parts of CP, 4 parts of HFC-134a;

[0078] Polyisocyanate: polymerized MDI Wanhua PM-200 150 parts.

[0079] In combination polyether:

[0080] The polyether composition is composed of 15 parts by weight of 3,4-diaminofurazol polyether polyol (prepared in Example 2): sucrose and glycerol polyether polyol (hydroxyl value is 385 mgKOH / g, functionality is 5.3) 51.4 Parts, 20 parts of sorbitol polyether polyol (hydroxyl value 432mgKOH / g, functionality 5.8), 5 parts of glycerol polyether polyol (hydroxyl value 192mgKOH / g, functionality 2.3);

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Abstract

The invention discloses 3,4-diaminofurazan polyether polyol, a preparation method, a rigid polyurethane foam prepared from the 3,4-diaminofurazan polyether polyol and a preparation method. The 3,4-diaminofurazan polyether polyol is prepared by taking 3,4-diaminofurazan as a starting material and carrying out addition reaction on the 3,4-diaminofurazan and olefin oxide to obtain the 3,4-diaminofurazan polyether polyol. The raw materials of the rigid polyurethane foam comprise compound polyether, a foaming agent and polyisocyanates according to the mass ratio of 100: 12-23: 130-160, the compoundpolyether contains 3,4-diaminofurazan polyether polyol, and the foaming agent contains HFC-134a. The 3,4-diaminofurazan is used as a novel polyether monomer of an initiator, and is compatible to HFC-134a well, and the prepared polyurethane foam has good dimensional stability and heat-insulation property when at low density.

Description

technical field [0001] The invention belongs to the field of new materials, and relates to a polyether polyol and rigid polyurethane foam, in particular to a 3,4-diaminofurazal polyether polyol and a preparation method thereof. Guide 134a system polyurethane rigid foam and its preparation method. 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 The blowing agents used to replace HCFC-141b and have no damage to the ozone layer include cyclopentane, HFC-245fa, HFC-134a, HFC-365a, LBA, etc. [0003] Among them, HFC-134a (1,1,1,2-tetrafluoroethane) is a blowing agent that does not contain chlorine atoms, does not damage the ozone layer, and has good safety performance. At present, the most commonly used foaming system in China is CP sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/26C08G18/48C08J9/14C08G101/00
CPCC08G18/4812C08G18/4816C08G18/4829C08G65/2621C08J9/146C08J2203/142C08J2205/10C08J2375/08C08G2110/0025
Inventor 陈文靖钟仁升王诗文叶俊赵明东朱霞林
Owner WANHUA CHEM NINGBO RONGWEI POLYURETHANE
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