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Method for producing high elasticity soft polyurethane foam

A soft polyurethane and foam technology, which is applied in the field of polyether to manufacture soft polyurethane foam, can solve the problems of high concentration, poor reproducibility, and insufficient ratio calibration

Inactive Publication Date: 2007-12-12
TH GOLDSCHMIDT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, market products based on this principle still suffer from the disadvantages of poor reproducibility, higher concentrations used and, in some cases, insufficient calibration of the ratio of the regulating effect to the shrinkage tendency in the foam boundary zone

Method used

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  • Method for producing high elasticity soft polyurethane foam
  • Method for producing high elasticity soft polyurethane foam
  • Method for producing high elasticity soft polyurethane foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A mixture consisting of:

[0038] 100.00 parts by weight of glycerol-based polyoxyalkylene triol consisting of 84% propylene oxide and 16% ethylene oxide and having a hydroxyl value of 35,

[0039] 0.70 parts by weight of triethylenediamine (33%, in dipropylene glycol),

[0040] 0.20 parts by weight of two-1,1-dimethylaminodiethyl ether,

[0041] 3.00 parts by weight of glycerol,

[0042] 3.00 parts by weight of water,

[0043] 10.00 parts by weight of fluorotrichloromethane, and

[0044] 0.02-1.5 parts by weight of siloxanes of the general formula I used according to the invention (practical weights of siloxanes of the general formula I are given in test series (a) and (b) below),

[0045] This mixture was reacted with 58.00 parts by weight of another mixture consisting of:

[0046] 40.00 parts by weight of diphenylmethane diisocyanate crude product, and

[0047] 60.00 parts by weight toluene diisocyanate (20% mixture of 2,6- and 80% 2,4-isomers).

[0048] In ca...

Embodiment 2

[0069] A mixture consisting of:

[0070] 100.00 parts by weight of glycerol-based polyoxyalkylene triol consisting of 84% propylene oxide and 16% ethylene oxide and having a hydroxyl number of 28,

[0071] 1.00 parts by weight of triethylenediamine (33% dipropylene glycol solution),

[0072] 3.00 parts by weight of triethanolamine,

[0073] 3.00 parts by weight of water,

[0074] 10.00 parts by weight of fluorotrichloromethane, and

[0075] 0.02-4.00 parts by weight of the siloxanes of the general formula I used according to the invention, the practical weights of the siloxanes of the general formula I are given in the following test series (c) and (d),

[0076] This mixture was reacted with 47.6 parts by weight of a partially crosslinked polyisocyanate based on toluene diisocyanate having an NCO number of 39. The conditions of the test were the same as in Example 1.

[0077] According to the invention, siloxanes of general formula I are used, wherein

[0078] c.R 1 =-C...

Embodiment 3

[0096] A mixture consisting of:

[0097] 100.00 parts by weight of polyoxyalkylene triol grafted with acrylonitrile and styrene, its hydroxyl value is 33,

[0098] The triethylenediamine (33% dipropylene glycol solution) of 0.60 weight part,

[0099] 2.00 parts by weight of triethanolamine,

[0100] Two-1,1-dimethylaminodiethyl ether of 0.15 parts by weight,

[0101] 2.00 parts by weight of water, and

[0102] 0.02-4.00 parts by weight of siloxanes of the general formula I used according to the invention,

[0103] This mixture was reacted with 27.10 parts by weight of toluene diisocyanate (20% mixture of 2,6- and 80% 2,4-isomers).

[0104] The conditions of the test were the same as in Example 1.

[0105] The foaming results obtained with the siloxanes used according to the invention and, for comparison, with conventional commercially available products, correspond in all respects to those obtained with respect to the elimination of boundary disorder and shrinkage tendenc...

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Abstract

The invention discloses a method for soft polyurethane foam foaming by using at least two hydroxyl groups. The foaming is carried out under existence of low- molecule weight and low viscosity polymethyl siloxane. There is no disorder and contract at foaming area in this invention.

Description

technical field [0001] This invention relates to a method for producing flexible polyurethane foams from polyethers. Foams of this type have recently received increasing attention as "cold hair foams" or "high resilience foams (HR foams)". Background technique [0002] There are a number of variations on the production of HR foams, which have been extensively described in the chemical literature. The polyethers, crosslinkers and polyisocyanates can vary equally as much as the auxiliaries used, such as catalysts, emulsifiers, propellants, etc. What these approaches have in common is that, due to the early crosslinking of the polyurethane foam, there is no need to use polysiloxane-polyether copolymers as stabilizing additives to prevent foam collapse. In practice, the use of such stabilizing additives is generally avoided because foam stabilizers - essential in the manufacture of "hot foams" which have hitherto dominated the art - can lead to intolerable Shrinkage tendencie...

Claims

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Application Information

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IPC IPC(8): C08G18/48C08G77/50C08J9/04C08G101/00
Inventor H・拉默廷R－D・兰根哈根G・罗斯米P・扎斯克
Owner TH GOLDSCHMIDT AG