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Silicone stabilizers for rigid polyurethane or polyisocyanurate foams

A polyisocyanurate and rigid polyurethane technology, applied in the field of foam stabilizers, can solve the problem of not being able to cover rigid foam preparations, and achieve the effect of reducing surface defects

Active Publication Date: 2012-07-25
EVONIK OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, the foam stabilizers described in these documents cannot cover the entire range of various rigid foam formulations, and in many fields there is a need for improvements to the foam stabilizers of the prior art in order to further optimize the performance characteristics of rigid foams, Especially with regard to thermal conductivity and foam defects on the surface

Method used

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  • Silicone stabilizers for rigid polyurethane or polyisocyanurate foams
  • Silicone stabilizers for rigid polyurethane or polyisocyanurate foams
  • Silicone stabilizers for rigid polyurethane or polyisocyanurate foams

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] According to Example 1 of EP 1439200, the Si-H-functional siloxanes to be used were prepared from equilibrated corresponding siloxane starting materials. (To prepare terminally modified siloxanes, correspondingly polymethylhydrogensiloxanes having terminal hydrogen functionality must be used as starting materials.) The type and amount of starting materials are selected such that in each case the desired siloxane is obtained structure.

[0106] Allyl polyethers were prepared analogously to the method described in Example 1 of DE 19940797, but here allyl alcohol was used as starter and ethylene oxide and propylene oxide or styrene oxide were used accordingly.

[0107] According to the method described in DE 102005001076, the allyl-initiated polyethers used are etherified (capped) by reaction with methyl chloride.

[0108] The hydrosilylation reaction (of Si—H-functional siloxanes with allyl polyethers) was carried out according to Example 1 of EP 1 520 870 .

[0109] Ta...

Embodiment 2

[0119] In the following, using (application) examples it is demonstrated that the use of the polyether siloxanes according to the invention in rigid foam formulations provides superior properties over the prior art.

[0120] Foaming tests were performed by hand mixing. For this, polyol, flame retardant, catalyst, water, conventional or inventive foam stabilizer and blowing agent were weighed separately into beakers and mixed for 30 seconds at 1000 rpm using a disc stirrer (diameter 6 cm). Determine the amount of foam evaporated during mixing by reweighing and replenishing. Then, MDI was added, the reaction mixture was stirred at 3000 rpm for 5 seconds using the described stirrer, and immediately transferred into a thermostatic aluminum mold lined with polyethylene film. Mold temperature and geometry varied with foam formulation. The amount of foam formulation used (based on about 100 g of polyol) was determined so that the foam formed therefrom was more than 15% above the mi...

Embodiment 2a

[0123] A formulation suitable for the field of application was used (see Table 4) and the inventive polyethersiloxane foam stabilizer of Example 1 (name see Table 3) and two non-inventive polyethersiloxane foams were used Stabilizers (Tegostab B 1048, a fully butyl-terminated polyether siloxane, and Tegostab B 8408, an uncapped (ie OH-only) polyether siloxane, both from Evonik Goldschmidt GmbH) were foamed separately. The reaction mixture was introduced into a 145 cm x 14.5 cm x 3.5 cm aluminum mold thermostated to 45°C.

[0124] Table 4: Recipes for Refrigerator Insulation

[0125] components weight fraction Daltolac R 471 * 100 copies N,N-Dimethylcyclohexylamine 1.5 servings water 2.6 servings Cyclopentane 13.1 copies Polyether siloxane 1.5 servings Desmodur 44V20L ** 198.5 copies

[0126] * Polyether Polyols from Huntsman

[0127] ** Polymeric MDI from Bayer, 200 mPa*s, 31.5 wt% NCO, functionality 2.7

[0128]...

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Abstract

The invention provides partially endcapped polyether siloxanes, the use of these polyether siloxanes as foam stabilizers and also rigid polyurethane or polyisocyanurate foams obtained using the polyether siloxanes.

Description

technical field [0001] The present invention relates to polyether siloxanes and their use as foam stabilizers in the production of polyurethane or polyisocyanurate foams, especially rigid foams, which offer particularly advantageous performance characteristics, such as low thermal conductivity and Good surface quality. Background technique [0002] The use of cell-stabilizing additives for the production of rigid polyurethane and polyisocyanurate foams ensures a homogeneous microcellular and low-defect foam structure and thus has a substantial effect on the performance characteristics of rigid foams, especially thermal insulation properties Positive effect. Surfactants based on polyether-modified siloxanes are particularly effective and thus represent a preferred class of foam stabilizers. [0003] Since there are a large number of different rigid foam formulations for different fields of application in which foam stabilizers have to meet individual requirements, polyether...

Claims

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Application Information

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IPC IPC(8): C08G77/46C08L75/04C08L83/12C08J9/00
CPCC08G2101/0025C08G77/46C08G18/61C08G18/48C08J2375/04C08J9/141C08L75/04F25D23/06C08G18/5096C08G2110/0025C08G18/00C08G2101/00C08J9/04C08G18/14C08G18/3203C08G18/70C08J9/0042C08J2205/10C08J2379/04
Inventor M·格洛斯C·席勒C·艾勒布雷希特
Owner EVONIK OPERATIONS GMBH
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