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Fast curing alkoxysilane spray foam

An alkoxysilane, multi-component technology, which is used in drug combinations, bandages, transportation and packaging, etc., can solve the problems of citric acid caustic or corrosive application range limitations, foam difficulties, etc.

Active Publication Date: 2021-09-10
COVESTRO DEUTSCHLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, a disadvantage affecting α- and γ-silanes is that it is extremely difficult to prepare sprayable foams from these prepolymers
Additionally, the caustic or corrosive potential of citric acid places considerable limitations on the range of applications of this composition

Method used

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  • Fast curing alkoxysilane spray foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0146] Example 1: Preparation of silane-terminated prepolymer STP1

[0147] The mixture of 1000g HDI and 1g benzoyl chloride was added dropwise and mixed with 1000g of polyalkylene oxide with a molar mass of 4680 g / mol at 80°C within 3 hours, and stirred for 12 hours after the dropwise addition, wherein the polyalkylene oxide was composed of Glycerol was initially prepared with 71% by weight ethylene oxide and 26% by weight propylene oxide, pre-dried at 0.1 mabr pressure and 100°C for 6 hours. Excess HDI was removed by thin-film distillation at 130° C. and 0.1 mbar. This gave a prepolymer having an NCO content of 2.42% and a viscosity of 3500 mPas.

[0148] Then 200 g of the prepolymer obtained were mixed with 31.7 g of Geniosil XL 926 within 10 minutes at 30-40°C. After further stirring at 30 °C for 60 min, complete conversion of the NCO prepolymer to STP was detected by IR spectroscopy. This gave a viscous, colorless liquid.

Embodiment 2

[0149] Example 2: Preparation of silane-terminated prepolymer STP2

[0150] 390 g of Desmodur N 3300 were dropwise mixed with 1125 g of a polyalkylene oxide having a molar mass of 2250 g / mol at 80° C. and stirred at 80° C. until an NCO content of 3.67% was reached, wherein the polyalkylene oxide consisted of Butyl diglycol was initially prepared, and the weight fraction of ethylene oxide was 79% and the weight fraction of propylene oxide was 14%, and it was pre-dried at 100° C. for 2 hours under a pressure of 0.1 mabr.

[0151] Then 5.0 g of the prepolymer obtained were mixed with 1.2 g of Geniosil XL 926 within 10 minutes at room temperature. After a further 30 min of stirring, complete conversion of the NCO prepolymer to STP was detected by IR spectroscopy. This gave a viscous, colorless liquid.

Embodiment 3

[0152] Example 3: Preparation of silane-terminated prepolymer STP3

[0153] 490 g of Desmodur XP 2599 was mixed dropwise at 80° C. with 394 g of a polyalkylene oxide having a molar mass of 2250 g / mol, and after the dropwise addition was stirred at 80° C. until an NCO content of 2.22% was reached, wherein the polyalkylene oxide consisted of Butyl diglycol was initially prepared, and the weight fraction of ethylene oxide was 79% and the weight fraction of propylene oxide was 14%, and it was pre-dried at 100° C. for 2 hours under a pressure of 0.1 mabr.

[0154]A solution of 51.8 g of the prepolymer obtained in 70 g of dry diethyl ether was then mixed with 7.5 g of Geniosil XL 926 within 10 minutes at room temperature. After a further 30 min of stirring, complete conversion of the NCO prepolymer to STP was detected by IR spectroscopy. This gave a viscous, colorless liquid.

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Abstract

This invention relates to fast curing alkoxysilane spray foams. In particular, the invention relates to isocyanate-free multicomponent systems, in particular for the preparation of foams for medicinal products such as wound dressings, which have at least two separate components, wherein the first component comprises at least one alkane The oxysilane-terminated prepolymer and the second component comprise an aqueous component, and wherein the aqueous component has a pH of 4.0-9.5 at 20°C.

Description

[0001] This patent application is a divisional application of the patent application with the application number 201280048066.7 and the application date of September 24, 2012 and the same title. technical field [0002] The invention relates to isocyanate-free multicomponent systems, in particular multicomponent systems for the production of foams for pharmaceutical products such as wound dressings. The invention further relates to shaped articles obtainable from the multi-component system of the invention, and to a multi-chamber pressure tank filled with the multi-component system of the invention. Background technique [0003] Sprayable multi-component systems are known from the prior art. There are sprayable fitting foams for filling voids, for example in the construction field. They are especially applied to fill gaps and voids between window and door frames and the surrounding brickwork and, in addition to good thermal insulation properties, also have good moisture res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/48C08G18/83C08G18/73C08G18/77C08G18/79C08J9/30A61L15/26A61L15/42C08L75/08
CPCA61L15/26A61L15/425C08G18/10C08G18/4238C08G18/4837C08G18/4845C08G18/485C08G18/73C08G18/771C08G18/792C08G18/837C08J9/30C08J2375/08C08G2110/0008C08G18/289C08L83/04C08L75/04A61P17/00B65D83/752C08G65/2639
Inventor J.舍恩贝格尔
Owner COVESTRO DEUTSCHLAND AG
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