Polyether polyvalent alcohol for preparing no-freon polyurethane hard foam plastic and preparation method thereof

A technology of rigid foam plastics and polyether polyols, applied in the field of polyether polyols and its preparation, can solve problems such as poor fluidity, high viscosity of the system, and influence on physical properties, and achieve no environmental pollution and mutual solubility High and simple production method

Inactive Publication Date: 2008-04-16
李颂兵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of method can improve a certain physical property of polyether or foam, such as improving the miscibility of polyether and cyclopentane or the dimensional stability of foam, it may also affect the other physical properties of polyether or foam
For example, in the invention of JP10182776, the polyether polyol is composed of 5-50% sucrose-glycerin / sorbitol general-purpose polyether and 30-60% aromatic polyol. The purpose of adding sucrose ether is to increase the degree of molecular crosslinking and improve dimensional stability. , but the obvious disadvantage of this invention is that the viscosity of the system is too high and the fluidity is not good

Method used

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  • Polyether polyvalent alcohol for preparing no-freon polyurethane hard foam plastic and preparation method thereof
  • Polyether polyvalent alcohol for preparing no-freon polyurethane hard foam plastic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation of embodiment 1 polyether polyol

[0024] Put 100g of mixed starter (30g of sorbitol, 20g of toluenediamine, 50g of propylene glycol) and 0.3% solid KOH catalyst based on the total mass of the final synthesized polyether into the autoclave, start the stirrer, and replace the reactor with nitrogen several times , At the same time, under the condition of about 100 ℃, vacuum dehydration for 1h makes it generate alcohol potassium system. Control the temperature of the reaction kettle at 90 to 120°C and the pressure at about 0.3MPa, and continuously add propylene oxide to the kettle until the hydroxyl value of the polyether is about 400mgKOH / g. After feeding, continue to react until the system pressure drops to -0.05MPa, and keep warm for 1 hour to replace the gas in the reactor with nitrogen, open the reactor, and add a certain amount of phosphoric acid to it to neutralize the KOH catalyst in the reactor, so that the polyether acid value is less than 0.2mgK...

Embodiment 2

[0026] The preparation of embodiment 2 polyether polyols:

[0027] The preparation of polyether polyol was carried out according to the steps in Example 1, except that the 100g mixed starter formula was changed to be composed of 20g sorbitol, 25g pentaerythritol, 25g bisphenol S, and 30g glycerin to obtain polyether polyol B. The measured polyether polyol B has a hydroxyl value of 405 mgKOH / g, a viscosity of 2450 mPa.s, and a cyclopentane solubility of 32 parts per 100 parts of polyether. Preparation of Foam Sample 2:

[0028] With the step in embodiment 1, just change polyether polyol A into polyether polyol B.

Embodiment 3

[0029] The preparation of embodiment 3 polyether polyols

[0030] The preparation of the polyether polyol is carried out according to the steps in Example 1, except that the 100g mixed initiator formula is changed to be composed of 20g sucrose, 15g bisphenol S and 65g glycerin, and the pre-synthesized polyether hydroxyl value is changed to 350mgKOH / g, To obtain polyether polyol C. The measured polyether polyol C has an actual hydroxyl value of 356 mgKOH / g, a viscosity of 900 mPa.s, and a solubility of cyclopentane of 38 parts per 100 parts of polyether. Preparation of Foam Sample 3

[0031] With the step in embodiment 1, just change polyether polyol A into polyether polyol c. For the foaming conditions and foam properties during the preparation of the above foam samples, please refer to the attached table.

[0032] The foaming conditions and properties of foam samples in the attached table

[0033]

[0034]

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Abstract

The present invention relates to a polyether glycol for preparing fluorin-free rigid PU foam and a preparation method thereof. The invention obtains the polyether glycol, at the condition of mixing initiator and using KOH as a catalyst, by adding the mixture into the high-pressure reaction kettle, stirring to displace by the nitrogen, evacuating and dehydrating, controlling the temperature and the pressure of the kettle, dripping oxyalkylene continuously into the kettle until the hydroxyl value meets the need of polyether to ring-opening polymerize with oxyalkylene. The mixing initiator comprises, a) at least one active hydrogen compounds with the functionality more than 3; b) one active hydrogen compound with an aromatic ring structure or heterocycle structure; c) at least one active hydrogen compound with a functionality not more than 3 different from a) and b). The foam after foaming of the polyether by cyclopentane or full-water has an excellent high and low temperature dimensional stability and an excellent compressive strength, capable of replacing the traditional foaming process system and being used in the fields of refrigeratory, deep freezer, heat preservation of the underground conduit and the solar energy water heater, building materials, etc.

Description

technical field [0001] The invention relates to a polyether polyol used for preparing fluorine-free polyurethane rigid foam and a preparation method thereof Background technique [0002] As we all know, rigid polyurethane foam is widely used in refrigerators, pipe insulation, solar water heater insulation, vehicle parts and building materials due to its excellent thermal insulation performance and good processing performance. However, for the preparation of rigid foam , the traditional method is generally made by foaming polyether polyol and isocyanate under the condition of chlorofluorocarbon compound as the foaming agent. Although CFC S The foam obtained by similar foaming has excellent physical and mechanical properties, but it has been gradually banned because of its destructive effect on the atmospheric ozone layer. Since the signing of the "Montreal Agreement", researchers from all over the world have done a lot of work, trying to develop new green fluorine-free poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/08C08G18/48
Inventor 李颂兵
Owner 李颂兵
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