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Synthetic method of low-isocyanate-index all-water hard foam polyether polyol

A technology of isocyanate index and polyether polyol, which is applied in the field of synthesis of low isocyanate index full hydraulic foam polyether polyol, can solve the problems of high cost, unsatisfactory use effect, and large amount of isocyanate, etc., and achieve high foaming activity , Enhanced foam structure and low viscosity

Pending Publication Date: 2020-08-18
HANGJIN JINXI CHLOR-ALKALI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are as follows: (1). The isocyanate is used in a large amount and the cost is high; (2) the foaming activity is not ideal for the spraying field that requires high fluidity and fast foaming speed.

Method used

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  • Synthetic method of low-isocyanate-index all-water hard foam polyether polyol
  • Synthetic method of low-isocyanate-index all-water hard foam polyether polyol
  • Synthetic method of low-isocyanate-index all-water hard foam polyether polyol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 (for molding)

[0035] The first step, preparation of activated melamine resin

[0036] Add 126g of melamine, 81g of formaldehyde solution with a mass concentration of 37%, and 105g of diethanolamine into the reaction kettle, stir and heat up to a polymerization temperature of 80°C, the polymerization reaction time is 3 hours, continue to heat up at 100°C for dehydration, and analyze that the water content is less than 0.05%. Get activated melamine resin.

[0037] The second step, preparation of crude polyether polyol

[0038] Add 243g of activated melamine resin and 149g of triethanolamine into the reaction kettle and stir to raise the temperature to a polymerization temperature of 125°C. Add 600g of epoxy compound (the mass ratio of PO to EO is 2:1) for mixed polymerization, mature until the pressure in the kettle remains constant, and degas , to obtain crude polyether polyol.

[0039] The third step, polyether polyol refining

[0040] Take the obtained ...

Embodiment 2

[0042] The first step, preparation of activated melamine resin

[0043] Add 126g of melamine, 162g of formaldehyde solution with a mass concentration of 37%, and 103g of diethylenetriamine into the reaction kettle, stir and heat up to a polymerization temperature of 85°C, the polymerization reaction time is 3 hours, continue to heat up at 100°C for dehydration, and analyze that the water content is less than 0.05%. An activated melamine resin is obtained.

[0044] The second step, preparation of crude polyether polyol

[0045] Add activated melamine resin (292g) and triethanolamine (105g) into the reaction kettle and stir to raise the temperature to a polymerization temperature of 115°C, then add epoxy compound (one-stage PO 400g, two-stage EO 200g) in sections, and the first-stage polymerization temperature is 115°C for 1.5 Hours, the second stage polymerized at 115°C for 3 hours, the addition method was continuous addition, immediately cut into the second stage after adding...

Embodiment 3

[0048] Embodiment 3 (for spraying)

[0049] The first step, preparation of activated melamine resin

[0050] Add 126g of melamine, 162g of formaldehyde solution with a mass concentration of 37%, and 103g of diethylenetriamine into the reaction kettle, stir and heat up to a polymerization temperature of 40°C, the polymerization reaction time is 7 hours, continue to heat up at 105°C for dehydration, and analyze that the water content is less than 0.05%. An activated melamine resin is obtained.

[0051] The second step, preparation of crude polyether polyol

[0052] Add activated melamine resin (292g) and triethanolamine (105g) into the reaction kettle and stir to raise the temperature to a polymerization temperature of 80°C, then add epoxy compounds (one-stage PO 400g, two-stage EO 200g) in sections, and the first-stage polymerization temperature is 80°C to polymerize 4 Hours, the second stage polymerized at 80°C for 3 hours, the addition method was continuous addition, immediat...

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Abstract

The invention relates to a synthesis method of low-isocyanate-index all-water hard-foam polyether polyol, which comprises the following steps: using activated melamine resin and organic amine as composite initiators for carrying out polymerization reaction with propylene oxide and ethylene oxide, neutralizing, refining and filtering to obtain the low-isocyanate-index all-water hard-foam polyetherpolyol. The melamine activated by the method is intersoluble with water, propylene oxide and ethylene oxide, so that the melamine is smoothly polymerized; the prepared low-isocyanate-index all-water hard foam polyether polyol is low in viscosity and good in flowability in the foaming process, a hard chain segment is introduced into a polyether chain segment, the functionality of polyether is improved, the foam structure is enhanced, the compressive strength of a product is high, the dimensional stability is improved, the use amount of isocyanate is reduced, and the foaming cost is reduced.

Description

technical field [0001] The invention belongs to the field of polyurethane synthetic materials, and relates to a method for synthesizing a low-isocyanate index full hydraulic foam polyether polyol. Background technique [0002] Rigid polyurethane foam has the advantages of low thermal conductivity, excellent mechanical properties, good sound insulation, aging resistance, chemical resistance, fast curing, and convenient molding. It is widely used in construction, petrochemical, refrigeration, shipbuilding, vehicles, aviation, Machinery, instruments, furniture and many other fields are indispensable polymer materials in production and life. [0003] The vast majority of traditional rigid polyurethane foams use physical blowing agents HCFCs and HCFCs. The destructive effect of chlorofluorocarbons on the atmospheric ozone layer has attracted great attention from governments and relevant departments of various countries. In order to protect the environment on which human beings d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C08G18/50C08G101/00
CPCC08G65/263C08G18/5063C08G2110/0083
Inventor 张格亮王兵马慧董良建孙志华
Owner HANGJIN JINXI CHLOR-ALKALI CHEM CO LTD