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Low acid organic metallic catalyst for producing soft, semisoft and hard urethane foam

A rigid polyurethane, organometallic technology, used in indoor sanitary piping installations, water supply installations, buildings, etc., can solve problems such as use restrictions, and achieve the effect of excellent low thermal conductivity value

Inactive Publication Date: 2004-08-11
AIR PROD & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Although organometallic catalysts have been recognized in many industrial coatings, adhesives, sealants and elastomers (C.A.S.E.) applications, their use in polyurethane-based flexible and semi-flexible foams has been limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Comparison of bismuth octoate or bismuth neodecanoate with tertiary amine catalysts in the production of rigid foams

[0042] Element

parts by weight (pphp)

polyol blend

100.0

water

2.0

HCFC 141b

37.0

catalyst

- changing

DC5700

3.0

Aggregated MDI

140 index

[0043] Polyol Blend - conventional, proprietary polyol blend produced by Dow Chemical Forane(R) 141b - conventional secondary HCFC blowing agent, sold by Elf Atochem.

[0044] Catalyst - See Table I

[0045] DABCO(R) DC5700 - a conventional silicone surfactant, sold by Air Products and Chemicals, Inc.

[0046] Polymeric MDI - conventional polymeric diphenylmethane diisocyanate (MDI), sold by Dow Chemical.

[0047] The above formulations were machine scale tested using a Cannon Type A-40 / 20 high pressure machine with a throughput of 25 to 30 lbs / min. The polyol, water, HCFC 141b, surfactant and catalyst a...

Embodiment 2

[0056] Effect of Catalyst (PC5 / PC41 on Bismuth Neodecanoate)

[0057] Element

parts by weight (pphp)

polyol blend

100.0

water

0.4

HCFC 141b

21.0

catalyst

0.1-1.0

DC193

2.0

Aggregated MDI

190 index

[0058] Polyol Blend - conventional polyol blend, sold by Dow Chemical Corporation Forane(R) 141b - conventional secondary HCFC blowing agent, sold by Elf Atochem.

[0059] Catalyst - See Table II

[0060] DABCO(R) DC 193 - conventional silicone surfactant, sold by Air Products and Chemicals, Inc.

[0061] Polymeric MDI - conventional polymeric MDI, sold by Dow.

[0062] The above formulations were machine scale tested using a Gusmer VH3000 high pressure variable ratio sprayer with a throughput of 10 to 20 lbs / min. The polyol, water, HHCCl41b, surfactant, and catalyst were charged to the resin day storage tank and stirred. The polymerized MDI is fed into the isocyan...

Embodiment 3

[0070] Effect of Acid in Organometallic Bismuth Catalyzed Polyurethane Flexible Foam

[0071] In this example, polyurethane foam was prepared in a conventional manner in place of various catalyst packages. This experiment evaluated the effect of excess 2-ethylhexanoic acid (2EHA) on the ability of bismuth tris-2-ethylhexanoate (bismuth octoate) to catalyze and produce high-quality flexible polyurethane foam. Conditions, starting materials and catalytic sites (moles of bismuth) were kept constant in these experiments.

[0072] The desired 1.9-2.0 pcf density molded flexible foam was prepared using conventional hand mixing techniques. Table III lists the physical properties obtained using various types of catalysts. The control catalyst package consisted of an industry standard amine package, Dabco 33LV and Dabco BL 11. To compare the effect of excess free acid on a commercial catalyst (Bicat H, 18 wt% Bi, 45 wt% free acid), a comparison was made with a low-acid bismuth catal...

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Abstract

The present invention relates to an improvement in flexible, semi-flexible and rigid foams formed by the catalytic reaction of an aromatic polyisocyanate, a polyol and a blowing agent and a process for preparing such polyisocyanate. The improvement resides in using an effective amount of a bismuth carboxylate or bismuth sulfonate having less than 34% free acid as the catalyst.

Description

Background technique [0001] Polyurethane foams produced by the catalytic reaction of polyisocyanates with polyols in the presence of various blowing additives are well known and are used in the manufacture of components and equipment for the automotive industry as well as for housing and other industries. One such blowing additive is a chlorofluorocarbon (CFC) blowing agent, which vaporizes as the reaction heats up. Reductions in the use of CFCs have been called for due to the recognition that CFCs can reduce ozone in the stratosphere. Therefore, the production of water-blown foams, in which foaming uses CO produced by the reaction of water with polyisocyanates 2 to carry out, has become increasingly important. [0002] The production of rigid polyurethane foam is well known and has a wide range of industrial and commercial applications. Rigid polyurethane foams have been used as packaging materials, flotation materials and various structural components. Rigid polyurethane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/16C08G18/22C08G18/76C08G101/00
CPCC08G2101/0025C08G2101/0008C08G2101/005C08G2101/0016C08G18/227C08G18/7664C08G2110/0016C08G2110/005C08G2110/0008C08G2110/0025E03C1/262E03C1/264
Inventor P·C·霍赫尔L·A·梅坎多J·D·托拜厄斯
Owner AIR PROD & CHEM INC
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