WO1994016005A1 - Depolymerisierungsmittel und depolymerisierungsverfahren für silicone - Google Patents
Depolymerisierungsmittel und depolymerisierungsverfahren für silicone Download PDFInfo
- Publication number
- WO1994016005A1 WO1994016005A1 PCT/EP1994/000003 EP9400003W WO9416005A1 WO 1994016005 A1 WO1994016005 A1 WO 1994016005A1 EP 9400003 W EP9400003 W EP 9400003W WO 9416005 A1 WO9416005 A1 WO 9416005A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- depolymerizing
- silicones
- depolymerizing agent
- alkylbenzenesulfonic acid
- depolymerization
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
- C08J11/18—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material
- C08J11/28—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic compounds containing nitrogen, sulfur or phosphorus
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/38—Polysiloxanes modified by chemical after-treatment
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2383/04—Polysiloxanes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Definitions
- the invention relates to a depolymerization agent and an associated method for the depolymerization of silicones and
- Silicones are extremely versatile compounds that can be modified and used. The similarity of the silicon-oxygen bond contained in them with the carbon-carbon bond enables the connection of practically any organic side groups to the silicon skeleton.
- the diverse synthetic possibilities of designing silicones and silicone polymers open up a wide range of applications. Silicon elastomers are produced and sold in large quantities, for example, as sealants.
- the polymeric silicones are based on an alternating Si-O framework.
- Si-O bonds can also be found in many inorganic silicate-containing materials, e.g. Glass, certain stones, clay, bricks, sand, etc.
- the silicones combine well with these materials, and at the same time they can be kept extremely flexible and elastic by installing suitable organic side chains. Together with their water-repellent nature, this makes them ideal adhesives, sealants and fillers for inorganic materials.
- the silicon-oxygen compound is chemically and thermally very stable and the silicones therefore have excellent use properties with regard to their chemical, thermal and mechanical stability.
- the same properties have the serious disadvantage that they can only be removed with difficulty.
- the invention is therefore based on the object of finding a means and an associated method with which silicones and silicone polymers can be broken down and removed.
- a depolymerizing agent which contains an alkylbenzenesulfonic acid as a de-polymerizing reagent and auxiliaries; and by a process for the depolization of silicone and silicone-containing polymers using an alkylbenzenesulfonic acid as a depolymerization reagent.
- alkylbenzenesulfonic acid as a depolymerizing reagent is based on a cleavage of the Si-O bond.
- the silicones are therefore not dissolved, but are broken down by chemical attack. Harmful aromatic and halogenated solvents can therefore be dispensed with.
- the shorter silicone fragments thus produced can easily be washed off with water or solvents.
- the alkylbenzenesulfonic acid used as the depolymerization reagent preferably has a secondary alkyl radical and is represented by the following formula:
- n is between 10 and 13.
- a very effective depolymerization reagent is decylbenzenesulfonic acid.
- the depolymerization agent according to the invention contains customary auxiliaries, which depend on the intended application in terms of type and quantity.
- the depolymerizing agent can, for example, be liquid, pasty or gel-like. Other formulations are possible insofar as practical application requires this.
- the depolymerization agent is liquid, it contains a solvent in addition to the depolymerization reagent.
- the common organic solvents are suitable for this. Saturated, aliphatic hydrocarbons can preferably be used. It is particularly advantageous to use hydrocarbons between C9 and C15 or odorless kerosene. If the application so requires, other special solvents or solvent mixtures can also be used.
- an inert filler can be added to the depolymerization agent as a thickener.
- gel-like to pasty agents can be produced.
- Silicon dioxide in various forms, preferably hydrophobic silica (hydrophobized silica gel) with a particle size of approximately up to 40 nanometers, preferably approximately 20 nanometers, can be used as the thickening agent.
- the proportions of the ingredients of the depolymerizing agent can be adapted practically freely to the requirements of the respective application.
- alkylbenzenesulfonic acid as a reagent for the depolymerization of silicones and silicone-containing polymers generally causes the silicones to be broken down into smaller and therefore much more soluble - or even soluble - fragments, which are then used economically with water or simple organic solvents ⁇ solvents, for example alcohols, can be washed off and removed.
- solvents for example alcohols
- DDBSA dodecylbenzenesulfonic acid
- 91 parts of saturated aliphatic hydrocarbon 9 parts of DDBSA (dodecylbenzenesulfonic acid) are dispersed in 91 parts of saturated aliphatic hydrocarbon.
- the DDBSA was supplied by Manro Products Ltd., Cheshire, England under the product name "Manro NA Acid”; the hydrocarbon was odorless kerosene from Shell Chemicals Ltd. It was worked with water-free materials under continuously water-free conditions.
- Example 1 To prepare an agent in paste form, a liquid agent according to Example 1 was first prepared. Thereafter, 13.5% by weight of hydrophobic silica from Wacker Chemie, product name N.20, was added as filler and thickener and stirred in until the paste had the desired consistency.
- Example 1 It is of course clear to the person skilled in the art that other solutions with different concentrations of depolymerization reagent than indicated in Example 1 can be prepared as liquid depolymerization agents.
- concentrations can be set anywhere between 0% by weight and the saturation limit of the respective alkylbenzenesulfonic acid in the respective solvent, for example 0.1% by weight, 1% by weight, 5% by weight, 10% by weight, 20 % By weight of DDBSA in kerosene.
- concentration of the reagent can be set continuously in the entire solubility range.
- each of the solutions prepared according to Example 1 can be thickened with filler as desired.
- the invention is not restricted to the concentration given in Example 2, but the concentration can be adjusted continuously depending on the desired viscosity of the paste or gel.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU58590/94A AU5859094A (en) | 1993-01-07 | 1994-01-03 | Depolymerization agent and method of depolymerizing silicones |
EP94904617A EP0678110A1 (de) | 1993-01-07 | 1994-01-03 | Depolymerisierungsmittel und depolymerisierungsverfahren für silicone |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP4300168.8 | 1993-01-07 | ||
DE19934300168 DE4300168A1 (de) | 1993-01-07 | 1993-01-07 | Depolymerisierungsmittel und Depolymerisierungsverfahren für Silicone |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994016005A1 true WO1994016005A1 (de) | 1994-07-21 |
Family
ID=6477790
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1994/000003 WO1994016005A1 (de) | 1993-01-07 | 1994-01-03 | Depolymerisierungsmittel und depolymerisierungsverfahren für silicone |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0678110A1 (de) |
AU (1) | AU5859094A (de) |
DE (1) | DE4300168A1 (de) |
WO (1) | WO1994016005A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0739926A1 (de) * | 1993-12-28 | 1996-10-30 | Tama Chemicals Co., Ltd. | Verfahren zur zurückgewinnung von organoalkoxysilane aus polydiorganosiloxan |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4438175A1 (de) | 1994-10-26 | 1996-05-02 | Bayer Ag | Aktivator zur Depolymerisation von vernetzten, gegebenenfalls füllstoffhaltigen und/oder unvernetzten Polysiloxanen |
US6001888A (en) * | 1994-10-26 | 1999-12-14 | Ge Bayer Siliconesgmbh & Co.Kg | Activator for the depolymerization of polysiloxanes which are crosslinked, optionally contain fillers and/or are uncrosslinked |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0199227A2 (de) * | 1985-04-26 | 1986-10-29 | Hansa Textilchemie GmbH | Verfahren zum Entfernen von auf Fasern, Garnen oder flächigen textilen Materialien befindlichen Siliconen |
EP0469778A1 (de) * | 1990-08-02 | 1992-02-05 | Technical Processing, Inc. | Methode und Zusammensetzung zur Verbesserung der Verarbeitbarkeit von Kautschuk und Kunststoffen |
JPH04318075A (ja) * | 1991-04-16 | 1992-11-09 | Kanto Chem Co Inc | シロキサン樹脂硬化物溶解除去液 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1068849B (de) * | 1959-11-12 | PYRO-CH1EMIE G.m.b.H., Rodenbach über Kaiserslautern | Reinigungsmittel für Windschutzscheiben mit Siliconabsorber | |
US2673843A (en) * | 1951-05-17 | 1954-03-30 | Connecticut Hard Rubber Co | Liquefaction of silicone rubber gum and products thereof |
DE1040722B (de) * | 1956-06-02 | 1958-10-09 | Bayer Ag | Verfahren zum Entfernen siliconhaltiger Filme |
US3706695A (en) * | 1970-10-12 | 1972-12-19 | Dow Corning | Method of preparing a silicone emulsion and regenerating same and electrically conductive product |
FR2406650A1 (fr) * | 1977-10-24 | 1979-05-18 | Centre Nat Etd Spatiales | Procede de purification de resines silicones en vue de reduire leur perte de poids sous vide pousse |
SU1623995A1 (ru) * | 1988-06-03 | 1991-01-30 | Предприятие П/Я В-2463 | Способ переработки кремнийорганических отходов |
US5110972A (en) * | 1991-07-18 | 1992-05-05 | Tremco Incorporated | Process for recycling silicone scrap and products relating thereto |
DE4200238A1 (de) * | 1992-01-08 | 1993-07-15 | Hartmann Haarkosmetik Gmbh | Mittel und verfahren zum zwecke der silikonentfernung auf haaren |
-
1993
- 1993-01-07 DE DE19934300168 patent/DE4300168A1/de not_active Withdrawn
-
1994
- 1994-01-03 AU AU58590/94A patent/AU5859094A/en not_active Abandoned
- 1994-01-03 EP EP94904617A patent/EP0678110A1/de not_active Withdrawn
- 1994-01-03 WO PCT/EP1994/000003 patent/WO1994016005A1/de not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0199227A2 (de) * | 1985-04-26 | 1986-10-29 | Hansa Textilchemie GmbH | Verfahren zum Entfernen von auf Fasern, Garnen oder flächigen textilen Materialien befindlichen Siliconen |
EP0469778A1 (de) * | 1990-08-02 | 1992-02-05 | Technical Processing, Inc. | Methode und Zusammensetzung zur Verbesserung der Verarbeitbarkeit von Kautschuk und Kunststoffen |
JPH04318075A (ja) * | 1991-04-16 | 1992-11-09 | Kanto Chem Co Inc | シロキサン樹脂硬化物溶解除去液 |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 017, no. 154 (C - 1040) 26 March 1993 (1993-03-26) * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0739926A1 (de) * | 1993-12-28 | 1996-10-30 | Tama Chemicals Co., Ltd. | Verfahren zur zurückgewinnung von organoalkoxysilane aus polydiorganosiloxan |
EP0739926A4 (de) * | 1993-12-28 | 1997-07-16 | Tama Chemicals Co Ltd | Verfahren zur zurückgewinnung von organoalkoxysilane aus polydiorganosiloxan |
US5783609A (en) * | 1993-12-28 | 1998-07-21 | Tama Chemicals Co., Ltd. | Process for recovering organoalkoxysilane from polyorganosiloxane |
Also Published As
Publication number | Publication date |
---|---|
AU5859094A (en) | 1994-08-15 |
EP0678110A1 (de) | 1995-10-25 |
DE4300168A1 (de) | 1994-07-14 |
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