Polyurethane foam system

A polyurethane and foam technology, applied in the field of foamed-in-place polyurethane foam systems, can solve the problems of a large number of catalysts, reduced emission behavior, and foam products that do not exhibit processing characteristics.

Active Publication Date: 2020-06-05
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Some of the disadvantages encountered using the above known foam systems include, for example, that the resulting foam products produced with the known systems do not exhibit favorable processing characteristics, such as fast reactivity and fast demoulding, while still maintaining reduced emission behavior
In addition, the use of lower emissive catalysts in foam systems to prepare "in-situ fast-response and fast-release foam polyurethane foams" is challenging as compared to other polyurethane foams used in other applications systems, such foam systems require the use of large amounts of catalyst

Method used

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Examples

Experimental program
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preparation example Construction

[0056] Of particular importance for the production of flexible foams are the reaction products of alkylene oxides, such as ethylene oxide and / or propylene oxide, with initiators containing 2 to 8, preferably 3 to 8, active hydrogen atoms per molecule . Suitable initiators include: polyols such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, glycerin, trimethylolpropane, triethanolamine, pentaerythritol, and sorbitol; polyamines such as ethylenediamine , toluenediamine, diaminodiphenylmethane, and polymethylenepolyphenylenepolyamine; and aminoalcohols, such as ethanolamine and diethanolamine; and mixtures of such initiators. Other suitable polyols include polyesters obtained by condensation of appropriate proportions of diols and higher functionality polyols with polycarboxylic acids. Still further suitable polyols include hydroxyl-terminated polythioethers, polyamides, polyesteramides, polycarbonates, polyacetals, polyolefins, pol...

example

[0098] The following examples are presented to further illustrate the invention, but are not to be construed as limiting the scope of the claims. All parts and percentages are by weight unless otherwise indicated.

[0099] Various terms and designations used in the examples are explained herein as follows.

[0100] VOC means volatile organic compound.

[0101] SPECFLEX* NC 138 is a glycerol initiated polyoxyethylene terminated polyoxypropylene polyol having an equivalent weight of approximately 2040, a nominal functionality of approximately 3.0, a percent polyoxyethylene capping of approximately 15%, and a hydroxyl number of approximately 28 ; and can be purchased from The Dow Chemical Company.

[0102] SPECFLEX NC 701 is a graft polyether polyol containing copolymerized styrene and acrylonitrile with an OH number of 19 to 25 mg KOH / g; and is commercially available from The Dow Chemical Company.

[0103] SPECFLEX ACTIV 2306 is an amine initiated autocatalytic polyether poly...

example 1- example 4 and comparative example A

[0118] The examples described in Table I include formulated polyol blends reacted with MDI. The MDI has the isocyanate content as described in Table I. The polyol blend (B side material) was mixed with the polymeric MDI (A side material) in a polyurethane dispenser. Such dispensing machines are commercially available as standard machines from equipment suppliers such as Henneke, KraussMaffei and Cannon. In the examples prepared as described in Table I, the formulations were subjected to the following processing conditions:

[0119] The dispenser is capable of mixing a given foam forming system at a given ratio of isocyanate to polyol. Ratio is controlled by pump / motor size. The dispensing temperature of the material is generally in the range of about 15°C to about 50°C. In the example, the temperature of the polymer T(poly) is 20°C; and the temperature of the isocyanate T(iso) is 20°C.

[0120] Dispensing pressures are typically in the range of about 100 bar to about 200 ...

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Abstract

A reactive polyurethane foam-forming composition including (I) an isocyanate-containing material; and (II) a polyol-containing admixture of: (a) at least one autocatalytic polyol; (b) at least one grafted polyol; (c) at least one reactive polyether polyol; (d) at least one reactive catalyst; (e) at least one surfactant; and (f) water; and a process for making the above foam-forming composition.

Description

[0001] related application [0002] This application claims the benefit of U.S. Provisional Application No. 62 / 584,167, filed November 10, 2017. technical field [0003] This invention relates to a blow-in-place polyurethane foam system and a method of making foam from such a system. Background technique [0004] Flexible polyurethane foam is a recognized article of commerce; and various polyurethane foam systems are known for producing flexible polyurethane foam for a wide variety of commercial applications, such as in cushioning, seating , bedding, furniture, transportation upholstery, carpet underlayment and packaging applications. Generally, a reaction mixture of polyol, polyisocyanate, catalyst, and / or other additives is used to prepare a foam-forming polyurethane reaction mixture composition, which in turn can be used to produce flexible polyurethane foam. However, there are great differences in the compositional characteristics of isocyanate compounds and hydroxy c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/50C08G18/63C08G18/65C08G18/66C08G18/76C08G18/28C08G18/32C08J9/00C08J9/08C08G18/30C08G101/00
CPCC08G18/485C08G18/5021C08G18/632C08G18/657C08G18/6688C08G18/7664C08G18/2865C08G18/302C08G18/3275C08G18/4816C08G18/482C08G2350/00C08G2110/005C08G2110/0008C08G2110/0058C08G18/2027
Inventor S·C·E·格拉西妮A·J·伯奇K·奥斯瓦德
Owner DOW GLOBAL TECH LLC
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