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Polyol pre-mixes having improved shelf life

Inactive Publication Date: 2017-03-23
ARKEMA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent is about a method for improving the shelf life of a polyol pre-mix used in the production of thermoset foams. The method involves measuring the apparent pH of each polyol and controlling it to be between 3 and 11.4. This is done by adding a halogenated hydroolefin blowing agent to the polyol. The technical effect of this method is to create a polyol pre-mix that has a longer shelf life, resulting in better storage and handling of the foam ingredients.

Problems solved by technology

However, the preparation of satisfactory thermoset foams using such halogenated hydroolefinic materials as blowing agents can be challenging, due to certain shelf-life issues.
However, if the polyol premix composition is aged, prior to treatment with the polyisocyanate, the foam are of lower quality and may even collapse during the formation of foam.”

Method used

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  • Polyol pre-mixes having improved shelf life

Examples

Experimental program
Comparison scheme
Effect test

example 1

pH Measurement

[0115]pH measurement was carried out at ambient temperature using a Metrohm 751 GDP Titrino titrator and an Unitrode Pt1000 (Metrohm part number: 6.0258.000, which is equivalent to Corning #476022) equipped with the temperature compensation function. Standard pH buffer solutions of 4, 7, and 10 purchased from Sigma-Aldrich Co. were used. The calibration was performed daily using the three standard buffer solutions. The slope according to the manufacturer's instruction should be within 0.95 to 1.05; the typical slope obtained is about 0.99 or 1.00. In order to measure apparent pH of a polyol, the procedure of IPA-water method that was described previously was followed. A master batch of isopropanol (HPLC grade purchased from Fischer Scientific) and deionized water solution was prepared using 10 volume parts of isopropanol and 6 volume parts of deionized water. 50 ml of IPA-water solution was dispensed with a 50 ml auto dispenser, and is about 44.4 g. The pH of the 50 ml...

example 2

[0117]In the following examples, foams were made by a hand mix method which is known to people skillful in the art. B-side mixtures were pre-blended and then charged into containers that are suitable for pressure up to 100 psig. Blowing agents were then added into the B-side container and mixed thoroughly. The B-side containers were then placed in an oven that had its temperature controlled at about 50° C. (122° F.). The A-side (MDI) and B-side (mixture of the polyol, surfactant, catalysts, blowing agent, and additives) were mixed with a hand mixer and dispensed into a container to form a free rise foam after storing in a shaker in which the temperature was kept at about 15.6° C. (60° F.). The formulations tested (all had an Iso Index of 110) each contained Rubinate M, a polymeric methylene diphenyl diisocyanate (MDI) available from Huntsman. All polyols were commercially available with desired properties. Tegostab® B 8486 is a surfactant available from Evonik-Degussa. PolyCat® 204 ...

example 3

[0118]Reactivity, gel time (seconds) and tack free time (seconds) were measured at the initial time and then 7 days and 14 days after aging at 50° C. Samples that were aged at 50° C. were weighed after they were removed from the oven to confirm that the loss of component in the B-side was negligible. A and B sides were mixed using an air driven mixer at about 4000 RPM for 5 seconds to ensure the mixing was thorough and foam quality was consistently good. Each formula was repeated at least once, and gel and tack free times were the average of duplicates; the standard deviation was typically about 1 second. The reactivity of the formula in Table 2 is summarized in Table 3-1.

TABLE 3Polyol composition and pH of each componentApparentPolyolPPHPpHPolyether polyol #822.728.59Polyether polyol #122.7210.21Polyester polyol #154.514.74

TABLE 3-1Reactivity (gel and tack free time) ofinitial, and 7 and 14 day aged at 50° C.Reactivity (seconds)Initial7 days14 daysGel time172428Tack free time213238...

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Abstract

A polyol pre-mix containing at least one halogenated hydroolefin blowing agent and having improved shelf life stability is provided, wherein each polyol combined with the halogenated hydroolefin blowing agent has an apparent pH of between 3 and 11.4. Controlling the apparent pH of the polyol(s) enables the polyol pre-mix to be stored for extended periods of time and then used in combination with organic polyisocyanate to produce foam formulations having gel times and tack free times not significantly different from those exhibited when freshly prepared polyol pre-mix is used.

Description

[0001]The present application claims priority to U.S. Provisional Patent Application Ser. No. 62 / 220,329 filed Sep. 18, 2015.FIELD OF THE INVENTION[0002]The present invention relates to a method of improving the shelf life of polyol pre-mixes that contain halogenated hydroolefin blowing agents, including hydrochlorofluoroolefin blowing agents such as HCFO-1233zd.BACKGROUND OF THE INVENTION[0003]The Montreal Protocol for the protection of the ozone layer mandated the phase out of the use of chlorofluorocarbons (CFCs). Materials more “friendly” to the ozone layer, such as hydrofluorocarbons (HFCs), e.g., HFC-134a, replaced chlorofluorocarbons. The latter compounds have proven to be greenhouse gases, causing global warming and are subject to reduction that is coordinated by the United Nations Framework Convention on Climate Change (UNFCCC). The emerging replacement materials, hydrofluoropropenes, were shown to be environmentally acceptable as they have zero ozone depletion potential (O...

Claims

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Application Information

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IPC IPC(8): C08J9/14
CPCC08J9/144C08J2375/08C08J2375/06C08J2201/022C08J2203/142C08J2205/052C08J2205/06C08J2205/10C08G18/4825C08G18/4829C08G18/7664C08G18/092C08G18/1808C08G18/1816C08G18/4018C08G18/42C08G18/4208C08G18/4812C08G2110/005C08G2110/0025
Inventor CHEN, BENJAMIN BINCOSTA, JOSEPH S.SESHADRI, SRI R.ABBAS, LAURENT
Owner ARKEMA INC
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