GB2033414A - Lubricants and release agent for rubber mouldings - Google Patents

Lubricants and release agent for rubber mouldings Download PDF

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Publication number
GB2033414A
GB2033414A GB7935485A GB7935485A GB2033414A GB 2033414 A GB2033414 A GB 2033414A GB 7935485 A GB7935485 A GB 7935485A GB 7935485 A GB7935485 A GB 7935485A GB 2033414 A GB2033414 A GB 2033414A
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United Kingdom
Prior art keywords
rubber
oxyethylene
oxypropylene
copolymer
release
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GB7935485A
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GB2033414B (en
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Evonik Operations GmbH
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TH Goldschmidt AG
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Priority to GB7935485A priority Critical patent/GB2033414B/en
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
    • C08L71/02—Polyalkylene oxides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions 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; Compositions of derivatives of such polymers
    • C08L83/10—Block- or graft-copolymers containing polysiloxane sequences
    • C08L83/12—Block- or graft-copolymers containing polysiloxane sequences containing polyether sequences
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/003—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/1033—Polyethers, i.e. containing di- or higher polyoxyalkylene groups used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
    • C10M2209/1045—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/105—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only
    • C10M2209/1055—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only used as base material
    • C—CHEMISTRY; METALLURGY
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    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/106—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing four carbon atoms only
    • C10M2209/1065—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing four carbon atoms only used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/107—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of two or more specified different alkylene oxides covered by groups C10M2209/104 - C10M2209/106
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/107—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of two or more specified different alkylene oxides covered by groups C10M2209/104 - C10M2209/106
    • C10M2209/1075—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of two or more specified different alkylene oxides covered by groups C10M2209/104 - C10M2209/106 used as base material
    • C—CHEMISTRY; METALLURGY
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    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/108—Polyethers, i.e. containing di- or higher polyoxyalkylene groups etherified
    • C10M2209/1085—Polyethers, i.e. containing di- or higher polyoxyalkylene groups etherified used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/109—Polyethers, i.e. containing di- or higher polyoxyalkylene groups esterified
    • C10M2209/1095—Polyethers, i.e. containing di- or higher polyoxyalkylene groups esterified used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/02—Unspecified siloxanes; Silicones
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/02—Unspecified siloxanes; Silicones
    • C10M2229/025—Unspecified siloxanes; Silicones used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/04—Siloxanes with specific structure
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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    • C10M2229/04—Siloxanes with specific structure
    • C10M2229/0405—Siloxanes with specific structure used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10M2229/04—Siloxanes with specific structure
    • C10M2229/041—Siloxanes with specific structure containing aliphatic substituents
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    • C10M2229/04—Siloxanes with specific structure
    • C10M2229/041—Siloxanes with specific structure containing aliphatic substituents
    • C10M2229/0415—Siloxanes with specific structure containing aliphatic substituents used as base material
    • C—CHEMISTRY; METALLURGY
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    • C10M2229/04—Siloxanes with specific structure
    • C10M2229/042—Siloxanes with specific structure containing aromatic substituents
    • C—CHEMISTRY; METALLURGY
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    • C10M2229/042—Siloxanes with specific structure containing aromatic substituents
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    • C10M2229/04—Siloxanes with specific structure
    • C10M2229/043—Siloxanes with specific structure containing carbon-to-carbon double bonds
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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    • C10M2229/04—Siloxanes with specific structure
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/04—Siloxanes with specific structure
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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    • C10M2229/04—Siloxanes with specific structure
    • C10M2229/05—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon
    • C10M2229/054—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon containing phosphorus
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/04—Siloxanes with specific structure
    • C10M2229/05—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon
    • C10M2229/054—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon containing phosphorus
    • C10M2229/0545—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon containing phosphorus used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/30—Refrigerators lubricants or compressors lubricants
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/32—Wires, ropes or cables lubricants
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/34—Lubricating-sealants
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/36—Release agents or mold release agents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/38—Conveyors or chain belts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/40—Generators or electric motors in oil or gas winning field
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/42—Flashing oils or marking oils
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/44—Super vacuum or supercritical use
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/50—Medical uses
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10—Semi-solids; greasy

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

Compositions suitable for use both as lubricant and release agents for rubber mouldings comprise a) a monoalkyl ether of an oxyethylene/oxypropylene copolymer, the weight ratio of oxyethylene groups : oxypropylene groups being 25 : 75 to 75 : 25, and b) a polyoxyalkylene/polysiloxane copolymer which is soluble or dispersible in component a), in a weight ratio of a) : b) of 99 : 1 to 25 : 75. These compositions enable the production of rubber mouldings, in particular hose elbows, such that the moulded rubber is easily removed from the mould after vulcanisation.

Description

SPECIFICATION Lubricants and release agents for rubber mouldings The present invention relates to compositions suitable for use as lubricants and release agents for rubber mouldings.
In the manufacture of rubber mouldings, release agents are required in order to be able to remove the moulded rubber articles from the moulds and to avoid sticking of mouldings to the walls of the mould. A frequent further demand made on a release agent of this type is, however, that it should reduce the friction of the rubber moulding on the wall of a moulding element.
Particularly difficult lubricant and release problems arise in the manufacture of so-called hose elbows, such as are required, for example, in car manufacture and in washing and cleaning machines. A vulcanisable blank is drawn over a mandrel which in some cases has a very complicated shape. After vulcanisation, the hot rubber moulding must be removed from the mandrel, and this requires the exertion of a considerable force. The required force is determined on the one hand buy the shape of the mandrel and on the other hand by the adhesion of the moulding to the mandrel.
To avoid adhesion and to improve the slip or lubricating properties, such blanks which are to be vulcanised and which are to be drawn over a curved mandrel, have been treated with dispersions of silicone oils, glycerol and waxes. Adhesion and friction are indeed reduced in this way. However, it is desirable to improve still further the lubricating properties of such a lubricating/release agent. Above all, it should also be possible to remove the lubricating/release agent without leaving any residue, so that there are no adverse effects in the use of the resulting hose elbows. Preferably, it should be possible to remove the lubricating/release agents by means of cold water, without leaving any residue.
In accordance with the present invention, there is provided a composition comprising a) a monoalkyl ether of an oxyethylene/oxypropylene copolymer, the weight ratio of oxyethyiene groups: oxypropylene groups being 25:75 to 75:25 and b) a polyoxyalkylene polysiloxane copolymer which is soluble or dispersible in the component a) in a weight ratio of a):b) of 99:1 to 25:75. The composition of the present invention can act both as a lubricant and as a release agent in the manufacture of rubber mouldings, and is of particular use in the manufacture of hose elbows.
The present invention also provides a method of producing a rubber moulding which comprises moulding a vuicanisable rubber in contact with a surface which has been treated with a composition as defined above.
The polyoxyethyiene/polyoxypropylene monoalkyl ethers are liquid to pasty products and, as a rule, form the predominant constituent of the mixture. They are prepared by subjecting ethylene oxide and propylene oxide, either as a mixture or block-wise one after the other, to an addition reaction with a starter alcohol, preferably having 1 to 6 carbon atoms, in particular n-butanol, in a manner which is in itself known. Other suitable starters are polyols, such as glycol, propylene glycol or glycerol. The products generally have an average molecular weight from 1 ,200 to 10,000.
Polyoxyalkylene/polysiloxane copolymers which can be used are known block copolymers which are also widely used as stabilisers in the foaming of polyurethane. They should, however, be soluble or dispersible in the above-mentioned polyoxyethylene/polyoxypropylene monoalkyl ethers in order to make a stable preparation possible. The compatibility of the two types a) and b) of compounds can be improved by adding small amounts of water.
The preparation and structure of polyoxyalkylene/polysiloxane copolymers of this type can be seen in German Patent Specification No. 1,795,557. It is immaterial here whether the polyoxyalkylene block is joined to the polysiloxane block via a SiC bridge or a SiOC bridge.
It has been found that neither the monoalkyl ethers of oxyethyiene/oxypropylene copolymers nor the polyoxyalkylene/polysiloxane copolymers are by themselves suitable for use as lubricating/release agents for the rubber mouldings. Surprisingly, however, an addition of 1 part by weight of the polyoxyalkylene/polysiloxane copolymer to 99 parts by weight of oxyethylene/oxypropylene copolymers already suffices to obtain a composition the properties of which are far superior to those of prior art products. The product which is to be used according to the invention has excellent release properties and increases the slip of vulcanised rubber mouldings, for example on curved mandrels, so that hose elbows can, after vulcanisation, be drawn off the mandrels substantially more easily and with the exertion of a smaller force.
The following Examples illustrate typical formulations for the compositions of the invention.
EXAMPLE 1.
Slip/release agents are prepared, in the mixing ratios listed in Table 1, by mixing a monobutyl ether of an oxyethylene/oxypropylene copolymer, having a molecular weight of 1,770 and a proportion of polyoxypropylene groups of 59.0% by weight, with a polyoxyalkylene/polysiloxane copolymer which has a cloud point of 327-331 K (54 to 580C), a viscosity of 1,200 mPas at 298 K (250C) and a density of 1.05 g/cm3 at 298 K (250C).
The resulting slip/release agents were assessed in the manner described in the following text.
To measure the release forces, the mixtures of the monobutyl ether of the oxyethylene/oxypropylene copolymer and the polyoxyalkylene/polysiloxane copolymer are applied to as cylindrical stainless steel mandrel with a diameter of 30 mm and a length of 1 50 mm in such a way that about 0.1 g of the release agent combination is uniformly distributed over 1 00 cm2 of surface. The mandrel is then covered with a 10 cm wide, 6 mm thick strip which completely surrounds the periphery of the mandrel and consists of an unvulcanised rubber mixture. To ensure perfect moulding, two half-shells of stainless steel are now placed around the rubber strip and firmly joined to one another.
The half-shells are formed in such a way that, during the subsequent vulcanisation and the expansion associated therewith, no rubber can emerge from the sealing joints and mounting joints between the mould and the mandrel. The arrangement charged in this way is then transferred into a vulcanisation kettle and the rubber mixture is fully vulcanised at an appropriate temperature for an appropriate time.
In this Example, a mixture of acrylqnitrile/butadiene rubber and styrene/butadiene rubber, having a tensile strength (DIN 53,504) of 10.6 Nmm-2 and a Shore hardness (DIN 53,505) of 67 Shore A, was used. The vulcanization time was 20 minutes at 423 K (1 500 C). After the end of vulcanisation, the arrangement was removed from the vulcanisation kettle and was cooled to 323 K (500 C). The size of the force acting tangentially on the moulding which is necessary to displace the moulding relative to the mandrel was then measured.An initial force (static friction) is measured, which is necessary for initiating the displacement -- designated release value in the Table - and a second force (sliding friction) is measured, which is necessary to continue the displacement -- designated slip value in the Table.
A good release agent should have a low release value and an even lower slip value. In practice, it has proved possible to use those release agents which have a parting value of < 10 and a slip value of < 2 without problems.
Table 1 shows that the pure monobutyl ether of the oxyethylene/oxypropylene copolymer does not give an adequate release/slip value. Although the pure polyoxyalkylene/polysiloxane copolymer gives a good release value, the lubricating effect, expressed by the slip value, is insufficient, whereas the mixtures according to the invention give both good release values and good slip values.
TABLE 1
Parts by weight of the monobutyl Parts by weight ether of of polyoxy- Release forces oxyethylene/ alkylene/ Slip/release oxypropylene polysi loxane Release Slip Agent No. copolymers copolymer value value 1 100 0 > 18 6.3 2 10 90 2.9 2.5 3 0 100 3.5 2.7 4 99 1 9.1 1.6 5 95 5 8.2 1.2 6 80 20 2.4 1.2 7 40 60 2.1 1.2 8 25 75 2.4 1.3 Nos. 1 to 3: comparison not according to the invention; Nos. 4 to 8: according to the invention.
EXAMPLE 2 A slip/release agent was prepared by mixing 95 parts by weight of a monobutyl ether of an oxyethylene/oxypropylene copolymer, having a molecular weight of 1,900 and a proportion of polyoxypropylene groups of 25.3% by weight, with 5 parts by weight of a polyoxyalkylene/polysiloxane copolymer which has a cloud point of 323 K (500C), a viscosity of 950 mPas at 298 K (250C) and a density of 1.04 g/cm3 at 298 K (250C), and is fully tested in accordance with the method described in Example 1.
A release value of 6.6 and a slip value of 1.4 were measured.

Claims (6)

1. A composition comprising: a) a monoalkyl ether of an oxyethylene/oxypropylene copolymer, the weight ratio of oxyethylene groups: oxypropylene groups being 25:75 to 75:25, and b) a polyoxyalkylene/polysiloxane copolymer which is soluble or dispersible in component a), in a weight ratio of a):b) of 99:1 to 25:75.
2. A composition according to claim 1 wherein component a) is an addition product of an oxyethylene/oxypropylene copolymer with a monohydric alcohol of 1 to 6 carbon atoms or a polyhydric alcohol.
3. A composition according to claim 2 wherein the alcohol is n-butanol, glycol, propylene glycol or glycerol.
4. A composition according to claim 1 substantially as hereinbefore described with reference to either Example.
5. A method of producing a rubber moulding which comprises moulding a vulcanisable rubber in contact with a surface which has been treated with, as lubricating/release agent, a composition as claimed in any one of the preceding claims.
6. A method according to claim 5 wherein the rubber moulding is a hose elbow.
GB7935485A 1978-10-16 1979-10-12 Lubricants and release agent for rubber mouldings Expired GB2033414B (en)

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GB7840689 1978-10-16
GB7935485A GB2033414B (en) 1978-10-16 1979-10-12 Lubricants and release agent for rubber mouldings

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GB2033414B GB2033414B (en) 1983-03-23

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