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Process for the manufacture of polyisocyanate polypolyols and products

A polyisocyanate and isocyanate-based technology, which is applied in the field of manufacturing dispersions of polyisocyanate polyaddition particles in polyols, can solve problems such as inapplicability and achieve the effect of high functionality

Active Publication Date: 2018-11-06
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process also introduces a large number of primary hydroxyl groups into the final product, which can affect its reactivity in a way that makes the production less suitable for conventional slabstock foam manufacture

Method used

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  • Process for the manufacture of polyisocyanate polypolyols and products
  • Process for the manufacture of polyisocyanate polypolyols and products

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0125] Example 1 and Comparative Samples A, B and C

[0126] Polyol A is a 3500 molecular weight nominal trifunctional copolymer with 92% propylene oxide and 8% ethylene oxide. It is manufactured using a potassium hydroxide catalyst from which residues have been removed. It contains about 0.1% by weight of water. Less than 2% of its hydroxyl groups are primary and the remainder are secondary.

[0127] The seed PIPA polyol is a 10% solids PIPA polyol manufactured in a conventional manner using a base polyol with predominantly primary hydroxyl groups and TEOA (see WO 2012 / 154831 ).

[0128] Charge 88 parts polyol A and 2 parts seed PIPA polyol into a high speed laboratory mixer. With rapid stirring, 5.32 parts of room temperature toluene diisocyanate (80% 2,4-isomer, "80 / 20 TDI") were added. After the toluene diisocyanate addition was complete, the mixture was stirred for 60 seconds followed by the addition of 0.4 parts of tin octoate catalyst. After an additional 60 second...

example 2 and 3

[0132] Polyol B is a nominally trifunctional copolymer of propylene oxide and ethylene oxide with a hydroxyl number of approximately 48. It is manufactured using a zinc hexacyanocobaltate catalyst complex. It contains about 0.1% by weight of water. Not more than 15% of its hydroxyl groups are primary and the remainder are secondary.

[0133] To make Example 2, 87.68 parts of room temperature polyol B were mixed with 0.2 parts of zinc formate catalyst, 2 parts of seed PIPA polyol, 0.1 parts of triethylenediamine catalyst solution, and 5.52 parts of 80 / 20 TDI on a laboratory speed mixer for two minutes, during which time 4.5 parts of triethanolamine were added with continued mixing. Mixing was continued for an additional 5 minutes without application of heat, during which time a stable PIPA dispersion was obtained.

[0134] Particle size was measured using a Beckman Coulter LS particle size analyzer. Essentially all particles are between 0.1 and 1 μm in size. The viscosity ...

example 3

[0137] Example 3 has a narrower particle size distribution than Example 2. This can be attributed to the preheating of the base polyol in Example 3. This reduces the viscosity of the TEOA, which may allow better dispersion of the triethanolamine in the base polyol mixture. In any event, such a narrow distribution of fine PIPA particles in the final PIPA polyol is unexpectedly obtained using the method of reacting the TEOA at the end.

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Abstract

PIPA polyols are manufactured in a two-step process. In a first step, a base polyether polyol is reacted with a polyisocyanate to form a mixture comprising unreacted base polyol, unreacted polyisocyanate, and adducts of the base polyol and polyisocyanate. The low equivalent weight polyol is then added and reacted to form a dispersion in a second step. The process unexpectedly produces stable dispersions of fine PIPA particles in base polyols, even when the base polyol contains mainly secondary hydroxyl groups. The method also allows adjustment of the product viscosity by increasing or decreasing the degree of reaction of the first step.

Description

technical field [0001] The invention relates to a process for the production of dispersions of polyisocyanate polyaddition particles in polyols which are suitable for the production of flexible polyurethane foams. Background technique [0002] Different types of "polymer polyols" are widely used as raw materials for the manufacture of flexible polyurethane foams and other polyurethane products. It has a continuous phase consisting of one or more compounds having multiple hydroxyl groups (ie the "base polyol") dispersed in small particles of another polymer. When polymer polyols are used to make polyurethane foam, the dispersed polymer particles help to form open cells and increase the load bearing of the foam. [0003] Several different types of polymer polyols are produced industrially. One type is known as "polyisocyanate polyaddition" polyol or "PIPA" polyol, which is produced by the reaction of a low equivalent weight polyol with a polyisocyanate in the presence of a b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/48C08G18/76C08G18/08C08G18/20C08G18/22C08G18/24C08G18/32
CPCC08G18/4837C08G18/4866C08G18/7621C08G18/7664C08G18/0876C08G18/2063C08G18/222C08G18/244C08G18/246C08G18/3281C08G18/6688
Inventor P·库克森F·卡萨蒂R·布雷拉D·赫纳I·阿米奇-克若提拉瓦
Owner DOW GLOBAL TECH LLC
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