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Flexible polyurethane foam and process to make

A polyurethane foam, flexible technology, applied in the field of elastic polyurethane foam, can solve the problem of deterioration of compression set value

Active Publication Date: 2019-08-23
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compression set values ​​deteriorate significantly as foam density decreases

Method used

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  • Flexible polyurethane foam and process to make
  • Flexible polyurethane foam and process to make
  • Flexible polyurethane foam and process to make

Examples

Experimental program
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preparation example Construction

[0024] Of particular importance for the production of the flexible polyurethane foams according to the invention are polyether polyols and polyol mixtures having a hydroxyl number equal to or less than 100, preferably equal to or less than 80, more preferably equal to or less than 60. The hydroxyl number indicates the number of reactive hydroxyl groups available for the reaction. It is expressed as milligrams of potassium hydroxide equivalent to the hydroxyl content of 1 gram of polyol.

[0025] Of particular importance for the production of flexible foams are the reaction products of alkylene oxides (for example 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, glycerol, trimethylolpropane, triethanolamine, pentaerythritol, and sorbitol; polyamines such as ethylen...

example

[0068] Examples 1 to 5 contain formulated polyol blends reacted with TDI. The isocyanate content of TDI is about 48% by weight. Mix the polyol blend (B-side) and polymeric TDI (A-side) in a polyurethane dispenser. Such dispensing machines are commercially available as standard machines from equipment suppliers such as Henneke, Krauss Maffei and Cannon.

[0069] The dispenser is capable of mixing the system in a given ratio. Ratio is controlled by pump / motor size. This distribution temperature of the material is in the range of 15°C to 45°C for both sides, and is preferably 25°C. The dispensing pressure is in the range of 100 to 180 bar at a material temperature of 25°C. The material distribution flow at the mixing head is in the range of 50 to 800 g / s.

[0070] Table 2 lists the isocyanate:polyol mixing ratios (by weight) for each of Examples 1 to 5.

[0071] For Examples 1 to 5, formulated A-side (containing isocyanate and other additives) and B-side (polyol blend conta...

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Abstract

Disclosed is a composition and process for making a flexible polyurethane foam from a polyol mixture that contains a copolymer polyol, a polyether polyol having a functionality equal to or greater than 3, an autocatalytic polyol, a hydroxyalkyltriethylenediamine and / or a hydroxytriethylenediamine catalyst, and a tertiary amine catalyst. Said foams have excellent resiliency and low compression setsand are particularly suited for use in low emission automobile seating applications.

Description

technical field [0001] The present invention relates to elastic polyurethane foams and methods for making those foams. Background technique [0002] Flexible polyurethane foam is widely used in cushioning, seating and bedding applications. These foams are mainly divided into two types. One type is "viscoelastic" or "memory" foam, which is characterized by low elasticity and a time-delayed and rate-dependent response to applied stress. These foams recover slowly after being compressed and are primarily used in certain types of bedding applications. A more common type of foam is an elastic foam that, when compressed, quickly returns the energy used to compress the foam. Resilient foam provides much better support and returns to its original shape quickly and forcefully after being compressed. The present invention relates to elastic foams of the latter type. [0003] One problem with elastic foams is compression set. Many cushioning foams used in seating and bedding appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/50C08G18/63C08G18/76C08G18/48
CPCC08G18/5021C08G18/632C08G18/7621C08G18/482C08G2110/0083C08G2110/0008C08G18/48C08G18/1825C08G18/1833C08K5/0025C08K5/17C08G18/4072C08G18/4829C08G18/485C08G18/7614C08J9/125C08J2201/022C08J2203/10C08J2205/06C08J2375/08
Inventor S·C·E·格拉西妮A·J·伯奇
Owner DOW GLOBAL TECH LLC