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Method for preparing temperature-resistant hard polyurethane foam

A rigid polyurethane and temperature-resistant technology, applied in the field of preparation of temperature-resistant rigid polyurethane foam, can solve problems such as high product viscosity, poor processing performance, and increased foam production costs

Active Publication Date: 2009-05-06
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] To sum up, there are more and more applications of high-temperature resistant polyurethane rigid foam, and there are many studies on how to improve the temperature resistance of polyurethane rigid foam materials. Different research institutions have proposed solutions to solve the temperature resistance of polyurethane rigid foam according to their own understanding. Generally speaking, the scheme has a very successful side, but at the same time, it has shortcomings. The concentrated performance is: (1) Due to the change of raw materials, the formula changes, and the application ratio of various materials changes, which leads to the increase of foam production cost
(2) The use of high-functionality polyether solves the problem of high-temperature dimensional stability, but the viscosity of the product is generally very high, above 10000mpa s / 25°C, and the post-processing performance is poor
(3) The introduction of other raw materials makes the production of polyurethane foam easy and flexible, and loses its advantages, thus affecting its application in this field

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0039] Synthesis of Sorbitan Polyether Polyols

[0040] In a 3-liter stainless steel high-pressure reactor, put 486 grams of solid sorbitol, 6 grams of potassium hydroxide, nitrogen replacement 3 times, heat to 110°C under negative pressure (-0.1Mpa), pre-dosing PO 100 grams, and wait for the pressure to drop gradually. At the beginning of the reaction, continuously add PO / EO mixture, among which, 1264 grams of PO and 150 grams of EO are refined after the reaction. The measured hydroxyl value is 450±50mgKOH / g, and the viscosity is 750mPa·s / 25°C.

Embodiment 2

[0041] Embodiment 2: the synthesis of sucrose polyether polyol

[0042] 3-liter stainless steel high-pressure reactor, put 525 grams of solid sucrose, 199 grams of diethylene glycol, 4 grams of dimethylethanolamine, nitrogen replacement 3 times, heated to 110 °C under negative pressure (-0.1Mpa), and continuously put in PO / EO The mixture contains 1140 grams of PO, 136 grams of EO, the hydroxyl value measured after the reaction is 450±50mgKOH / g, and the viscosity is 10000mpa·s / 25℃.

Embodiment 3

[0043] Embodiment 3: the synthesis of phthalic anhydride series polyester polyol

[0044] 3 liter stainless steel autoclave with distillation unit. Add 792 grams of phthalic anhydride, 1251 grams of diethylene glycol, and 0.63 grams of tetrabutyl titanate, replace with nitrogen 3 times, heat to 220°C, and react for 4 hours, distill most of the stoichiometric amount of by-product water, heat up to 240°C, and react After 2 hours, cool down and discharge, the acid value is 2mgKOH / g, the hydroxyl value is 350±30mgKOH / g, and the viscosity is 1500mPa·s / 25°C.

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Abstract

The invention discloses a making method of heatproof hard polyurethane foam, which is characterized by the following: adopting composite technique of multiple polyethers / polyester polyol with high functional degree (fn:5-6) or heterocyclic structure in the molecular chain segment; making the aromatic ring structure material of polyester polyol as reacting monomer; allocating polyether polyol and polyester polyol according to certain proportion; reacting under catalyst, foamer, uniform foaming agent and PAPI with the index of isocyanate at 1. 05-1. 10; synthesizing PUF foam.

Description

technical field [0001] The invention relates to a method for preparing polyurethane foam, in particular to a method for preparing temperature-resistant rigid polyurethane foam by compounding polyether polyol and polyester polyol with a special structure and synthesizing with a certain amount of isocyanate Background technique [0002] Polyurethane rigid foam (polyurethane rigid foam for short) has the characteristics of good thermal insulation effect, high specific strength, electrical properties, chemical resistance and sound insulation effect, and is widely used as thermal insulation material and non-thermal insulation structural material. At present, polyurethane rigid foam has been widely used in construction, petrochemical, refrigeration, shipbuilding, aviation, machinery, instrumentation and other fields. [0003] According to statistics, since the advent of hard polyurethane foam, the consumption has increased steadily. By 2002, the annual output of hard polyurethane ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/48C08G18/42C08G101/00
Inventor 李玉松周红郝敬颖冯芸
Owner CHINA PETROLEUM & CHEM CORP
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