GB2088898A - Tire Curing Bladder Treatment Lubricants, Coated Bladders and Method of Curing Tires - Google Patents
Tire Curing Bladder Treatment Lubricants, Coated Bladders and Method of Curing Tires Download PDFInfo
- Publication number
- GB2088898A GB2088898A GB8133846A GB8133846A GB2088898A GB 2088898 A GB2088898 A GB 2088898A GB 8133846 A GB8133846 A GB 8133846A GB 8133846 A GB8133846 A GB 8133846A GB 2088898 A GB2088898 A GB 2088898A
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- United Kingdom
- Prior art keywords
- tire
- bladder
- parts
- weight
- composition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0654—Flexible cores therefor, e.g. bladders, bags, membranes, diaphragms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
- B29C33/60—Releasing, lubricating or separating agents
- B29C33/62—Releasing, lubricating or separating agents based on polymers or oligomers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
- B29C33/60—Releasing, lubricating or separating agents
- B29C33/62—Releasing, lubricating or separating agents based on polymers or oligomers
- B29C33/64—Silicone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/10—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies
- B29C43/12—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies using bags surrounding the moulding material or using membranes contacting the moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0654—Flexible cores therefor, e.g. bladders, bags, membranes, diaphragms
- B29D2030/0655—Constructional or chemical features of the flexible cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2019/00—Use of rubber not provided for in a single one of main groups B29K2007/00 - B29K2011/00, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2030/00—Pneumatic or solid tyres or parts thereof
-
- 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
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/02—Water
-
- 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
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/10—Compounds containing silicon
- C10M2201/102—Silicates
- C10M2201/103—Clays; Mica; Zeolites
-
- 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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/14—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to carbon atoms of six-membered aromatic rings
- C10M2207/141—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to carbon atoms of six-membered aromatic rings monocarboxylic
-
- 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
-
- 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
-
- 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
- C10M2229/041—Siloxanes with specific structure containing aliphatic substituents
-
- 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
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Lubricants (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Lubricant composition comprised of 10-40 parts by wt. bentonite clay, of specified mesh size 15-45 parts by wt. polydimethylsiloxane of specified viscosity, 12-36 parts by wt. poly(ethylene glycol and/or propylene glycol) of molecular weight 1500 to 2500 and 10-25 parts by wt. surfactant are used as aqueous emulsions in treating tire cure bladder. Rubber tires are moulded utilizing such a coated cure bladder.
Description
SPECIFICATION
Treated Tire Curing Bladder Treatment,
Composition Therefor, and Method of Curing
Tires
Field of the Invention
This invention relates to tire curing bladder lubricant compositions, tire curing bladders having an outer coating of such lubricant composition, and a method of curing tires utilizing such a coated bladder.
Background
Conventionally, pneumatic rubber vehicle tires are produced by molding and curing a green, or uncured and unshaped, tire in a molding press in which the green tire is pressed outwardly against a mold surface by means of an inner fluid expandable bladder. By this method the green tire is shaped against the outer mold surface which defines the tire's tread pattern and configuration of sidewalls. By application of heat the tire is cured. Generally, the bladder is expanded by internal pressure provided by a fluid such as hot gas, hot water and/or steam which also participates in the transfer of heat for curing or vulcanization purposes. The tire is then allowed to cool somewhat in the mold, sometimes aided by adding cold or cooler water to the bladder.Then the mold is opened, the bladder collapsed by removal of its internal fluid pressure and the tire removed from the tire mold. Such use of the tire curing bladders is well known to those having skill in such art.
It is recognized that there is a substantial relative movement between the outer contacting surface of the bladder and the inner surface of the tire during the expansion phase of the bladder prior to fully curing the tire. Likewise there is also a considerable relative movement between the outer contacting surface of the bladder and the cured inner surface of the tire after the tire has been molded and vulcanized during the collapse and the stripping of the bladder from the tire.
Unless adequate lubrication is provided between the bladder and the inner surface of the tire there is typically a tendency for the bladder to buckle, resulting in a mis-shaping of the tire in the mold and also excessive wear and roughening of the bladder surface itself. Also, the bladder surface can tend to stick to a tire's inner surface after the tire is cured and during the bladder collapsing portion of the tire curing cycle. Further, air bubbles can potentially become trapped between the bladder and tire surfaces and promote tire vulcanizing defects due to lack of adequate heat treansfer.
For this reason, it is a conventional practice to precoat the inner surface of the green or uncured tire with a lubricant in order to provide lubricity between the outer bladder surface and inner tire surface during the tire shaping and molding operation. Sometimes the lubricant has been called a lining cement. Conventionally, the inner surface of the green tire, which is typically a rubber gum stock, is simply spray-coated in a confined, ventilated, spray booth, with a lubricant which might, for example, be based upon a silicone polymer. Other additives may also conventionally be utilized in the lubricant composition such as mica, polymeric polyols, cellulose ethers, clay such as bentonite clay and the like. Some lubricants are solvent based and some are water based. Often aqueous soap solutions are utilized. Many lubricant compositions have been taught in the art for such purposes.
However, a conventional practice of spraycoating the inner surface of the green tire with a lubricant composition can result in a relatively high labor intensive operation which can add appreciably to the cost of producing the tire. The tire must be transported to and from the spray booth and time must be allowed for the spraylubricant coat to dry. Therefore it is desired to provide an enhanced lubrication system as a composition and use thereof for molding or shaping and curing of green tires.
Disclosure and Practice of Invention
In accordance with this invention, a lubricant composition is provided as the product of a mixture which comprises:
(A) about 10 to about 40, preferably about 25 to about 35 parts by weight bentonite clay having a mesh size in the range from about 100 to about 500, preferably about 200 to about 400, U.S.
Standard sieve size;
(B) about 15 to about 45, preferably about 25 to about 35 parts by weight polydimethylsiloxane characterized by having a viscosity in the range of about 40,000 to about 120,000, preferably about 50,000 to about 70,000 centistokes at 250C;
(C) about 12 to about 36, preferably about 20 to about 30 parts by weight poly(ethylene glycol and/or propylene glycol) characterized by having a molecular weight in the range of about 1500 to about 2500, preferably about 1800 to about 2200;
(D) about 10 to about 25, preferably about 15 to about 20 parts by weight surfactants for said polydimethylsiloxane and poly(alkylene glycol); and
(E) optionally, about 4 to about 12 parts by weight of a stabilizer.
The composition for application to the bladder surface is an aqueous emulsion or dispersion, of the compositions. For example, the compositions for such application also contains (F) about 500 to about 1500, preferably about 600 to about 800, parts by weight water which, after application to the bladder, is dried by evaporation.
Certainly more water could be used, although additional dilution of the composition should reduce the efficiency of its application.
It is understood that the polydimethylsiloxane may be hydroxyl capped as an ingredient (precursor) in preparing the composition.
In further accordance with this invention, an expandable rubber tire-curing bladder having such a coating composition thereon (particularly after water removal) is provided. In practice, the rubber for the bladder is typically a butyl or butyl-type rubber (copolymer of isoprene and isobutylene).
By the term butyl-type, it is intended to mean various modified basic butyl rubbers such as halogen-substituted butyl rubbers which may be, for example, chlorobutyl or bromobutyl rubber.
In still further practice of this invention, a method of preparing a pneumatic or semipneumatic rubber tire is provided in which a green tire is placed in a tire mold, the coated expandable bladder of this invention positioned therein, the mold closed and bladder expanded by application of internal hot fluid pressure to force the tire outward against the mold surface to shape and cure the tire followed by opening the mold, collapsing the bladder and removing the shaped and cured tire. The bladder is generally connected to an internal part of the tire mold itself.
In more detail, for example, such a method of molding a pneumatic or semi-pneumatic tire which comprises the steps of:
(A) providing or building a green tire with elements which are to be its outer tread for ground-contacting purposes, two spaced inextensible beads, sidewalls extending radially outwardly from said beads to join said tread, supporting carcass with reinforcing elements, and an inner surface of rubber gum stock;
(B) inserting said green tire into a tire mold press and positioning a coated tire cure bladder of this invention inside of said green tire, said bladder being attached to an internal portion of said tire press;
(C) closing the tire mold and expanding said coated tire cure bladder by internal, heated fluid outwardly against the inner gum stock surface of said tire to press the tire outward under conditions of heat and pressure to shape and cure said tire;;
(D) opening the tire mold, collapsing said bladder and removing the cured tire having a generally toroidal shape therefrom.
The term "pneumatic tire" relates to tires which rely on an internal fluid, such as air under pressure in their tire cavity for their proper operation when mounted on a rim and the term "semi-pneumatic" tire relates to tires which contain an internal fluid, such as air, in their cavity but do not totally rely on its pressure for its proper operation when mounted on a rim.
In the practice of this invention, the aqueous emulsion or dispersion of the lubricant composition can conveniently be provided by the method which comprises,
(A) mixing under high shear mixing conditions about 10 to about 40, preferably about 25 to about 35, parts by weight bentonite clay having a mesh size in the range of about 100 to about 500, preferably about 200 to about 400, U.S.
Standard sieve size with about 500 to about 1 500, preferably about 600 to about 800 parts by weight water at a temperature in the range of about 200C to about 950C, preferably the water being preheated to about 500C to about 850C, until the mixture appears to be thickened;
(B) mixing therewith about 15 to about 45, preferably about 25 to about 35 parts by weight polydimethylsiloxane characterized by having a viscosity in the range of about 40,00 to about 120,000, preferably about 50,000 to about 70,000 centistokes at 250C, about 12 to about 36, preferably about 20 to about 30, parts by weight of poly(ethylene glycol and/or propylene glycol) characterized by having a molecular weight in the range of about 1 500 to about 2500, preferably about 1800 to about 2200, and surfactant, preferably about 4 to about 10 parts by weight, for said polydimethylsiloxane and poly(alkylene glycol); (C) optionally mixing therewith about 2 to about 10 parts by weight additional surfactant for reduced friction between bladder and tire;
(D) optionally mixing therewith about 2 to about 8 parts by weight corrosion inhibitor;
(E) optionally mixing therewith about 0.2 to about 1.0 part by weight defoamer;
(F) optionally mixing therewith about 2 to about 10 parts by weight stabilizer.
It is surely appreciated that various relatively well known defoaming agents and various stabilizers can be used in the practice of this invention which are generally well known to those having skill in the pertaining art.
The aqueous emulsion or dispersion is simply coated, such as by spray coating, onto the bladder and dried by evaporation at a temperature, for example, in the range of about 200C to about 11 O0C. It is preferred that the bladder is from about 80 to about 150 percent of its tire curing expanded position or condition for this coating purpose (as opposed to being deflated or collapsed), although it is not considered necessary and bladders have been successfully coated in a somewhat deflated condition.
In the practice of this invention, it has been observed that when utilizing the coating prescribed herein on a rubber bladder, about six to about nine tires could be molded from such bladder (6 to 9 tire cure cycles) until excessive adhesion between the contacting outer surface of the bladder and the inner surface of the tire was experienced, as evidenced by their tendency to excessively stick together upon collapse of the bladder after curing the tire.
It is considered that this number of cure cycles compares favorably with earlier coating compositions with which the inventors have been familiar.
An important part of the lubricant composition, of course, is the presence of the polydimethylsiloxane fluid. However, it is to be appreciated that such a coating had been observed to be somewhat greasy unless the bentonite clay is also used, which not only tends to defeat the greasy appearance of the coated bladder surface but also apparently significantly enables potential trapped air to bleed from the surface. The optional additional soap or surfactant can be beneficial because it apparently can increase slip between bladder and tire.
The optional defoamer can be of a dimethylpolysiloxane emulsion in water which is beneficial because it prevents or inhibits foam formation during mixing.
The practice of this invention is further illustrated by reference to the following example which is intended to be representative rather than restrictive of the scope of the invention. Unless otherwise indicated, all parts and percentages are by weight.
Example
A lubricant composition was prepared according to the following recipe shown in Table 1.
Table 1
Material Parts
Bentonite Clay (325 mesh) 12.5
Water 759
Polydimethylsiloxane and polyglycoll 62.5
Surfactant2 6.25
Rust Inhibitor (sodium benzoate) 5
Defoamer 0.33
Stabilizer 6.25
1. Reported to be a polydimethylsiloxane viscous fluid having a viscosity of about 60,000 centistokes in a mixture comprised of about 31.3 parts of said polydimethylsiloxane, about 25 parts polypropylene glycol having a molecular weight of about 2000 and about 6 parts surfactant therefor.
2. A sodium vegetable oil soap which is considered to be optional in nature.
The aqueous emulsion dispersion was prepared according to the following procedure:
(A) Heat the water to a temperature of about 1400F and add the clay. Mix at 2500 rpm in a
Cowles mixer for about 2-5 minutes during which the appearance of the mixture indicates that it has thickened.
(B) Add the organopolysiloxane fluid mixture with high shear at 2500 rpm in order to make a water emulsion.
(C) Add the additional surfactant.
(D) Add the rust inhibitor for the purpose of protecting the applicator apparatus.
(E) Add the defoamer silicone.
(F) Add the stabilizer.
The mixture was spray coated onto the outer surface of the rubber tire curing bladder in its expanded condition. The coating was allowed to dry at about 65 0C. The coating was re-applied after about four tire cure cycles with maximum of about 6 hours between coating applications.
The coating was dried for about a minute on the hot (650C) bladder surface to preform a lubricant composition coating thereon.
The bladder itself was of the butyl rubber type of a generally toroidal shape with overall, expanded condition diameter of about 39 inches and tubular diameter of about 10 inches. Its surface has been pretreated by washing with a hydrocarbon solvent, followed by drying, to remove surface oils and the like.
A radial ply green tire was fabricated of the 11 R 22.5 size.
The tire was placed in a tire mold press and the coated bladder, attached to the mold, inserted inside the tire. The mold was closed and the bladder was expanded by steam at a temperature of about 1 900C to force it against the inside surface of the tire and press the tire outwardly against the outer mold surface so that the tire was shaped as desired and cured.
The mold was then opened, the bladder collapsed and the tire removed therefrom. By this procedure it was observed that about 6 to about 9 tires could be molded from the bladder within about an 8-hour period (cure cycles) before it was necessary to recoat the bladder with the lubricant composition.
Generally, recoating is considered necessary when the bladder excessively sticks to the inner surface of the precured tire when the expanded bladder is collapsed or collapsing after the curing operation.
It is recognized that the inner surface of the tire is typically a compounded rubber gum stock which can be of various rubbers or their mixtures such as natural rubber, cis 1,4-polyisoprene, cis 1,4-polybutadiene, butadiene-styrene copolymer, butyl rubber, holo-butyl rubber such as chlorobutyl and bromobutyl and EPDM (ethylenepropylene-minor amount of diene, terpolymer).
In this example, preparation of a radial ply tire is exemplified. Although the invention can sometimes be considered to be more adaptable to radial ply rather than to bias ply tire production because the bladders are generally required to expand more during a bias ply tire cure cycle, thereby stressing the bladder's surface coat, it is considered that the invention is generally readily adaptable to bias ply tire production.
It is important to appreciate that the tire in this
Example was prepared by expanding the coated bladder directly against the inner gum stock surface of the tire to press the tire outward under conditions of heat and pressure to shape and cure the tire. Thus, the coated bladder effectively enabled the preparation of the tire without application of a lubricant coating or liner cement, on the inner surface of the green tire. This is considered significant since it adequately demonstrated that the coated bladder of this invention provided adequate lubrication for a series of sequential tire cure cycles under conditions of heat and pressure, expansion and contraction without the conventional, attendant tire liner cement, or lubricant, pre-coated on the inside surface of the tire. It is reasonably considered that this will result in a considerable savings of labor and material in the preparation of a pneumatic tire. Although it is appreciated that a lubricant precoat coyldbe used on the inner surface of the green tire, if desired, in conjunction with the coated bladder, it is considered important that this Example demonstrated that it was not required.
While certain representative embodiments and details have been shown for the purpose of illustrating the invention, it will be apparent to those skilled in this art that various changes and modifications may be made therein without departing from the spirit or scope of the invention.
Claims (19)
1. A lubricant composition as the product of a mixture which comprises:
(A) about 10 to about 40 parts by weight bentonite clay having a mesh size in the range from about 100 to about 500 U.S. Standard Sieve
Size;
(B) about 15 to about 45 parts by weight polydimethylsiloxane having a viscosity in the range of about 40,000 to about 120,000 centistokes at 250C;
(C) about 12 to about 31 parts by weight poly(ethylene glycol and/or propylene glycol) characterized by having a molecular weight in the range of about 1500 to about 2500;
(D) about 10 to about 25 parts by weight surfactant(s) for said polydimethylsiloxanes and poly(alkylene glycol),
(E) optionally, about 4 to about 12 parts by weight of a stabilizer.
2. The lubricant composition of Claim 1 where said polydimethylsiloxane of (B) is hydroxyl capped.
3. The lubricant composition of Claim 1 as an aqueous emulsion containing about 500 to about
1500 parts by weight water.
4. The lubricant composition of Claim 2 as an aqueous emulsion containing about 500 to about
1 500 parts by weight water.
5. A cured, rubber, expandable tire cure bladder having a coating of the composition of
Claim 1 on its outer exposed surface.
6. A cured, butyl-type rubber, expandable, toroidal shaped, tire cure bladder for a pneumatic or semi-pneumatic tire having a coating of the composition of Claim 2 on its outer surface.
7. A method of preparing the composition of
Claim 1 or 2 which comprises:
(A) mixing under high shear mixing conditions about 10 to about 40 parts by weight bentonite clay having a mesh size in the range of about 100 to about 500 U.S. Standard Sieve Size with about 500 to about 1500 parts by weight water at a temperature in the range of about 200C to about 900C until the mixture appears to be thickened.
(B) mixing therewith while maintaining the mixture temperature in the range of about 200C to about 950C, about 15 to about 45 parts by weight polydimethylsiloxane characterized by having a viscosity in the range of about 40,000 to about 120,000 centistokes at 25 OC, about 12 to about 36 parts by weight of poly(ethylene glycol and/or propylene glycol) characterized by having a molecular weight in the range of about 1500 to about 2500, and surfactant for said polydimethylsiloxane and poly(alkylene glycol);
(C) optionally mixing therewith about 2 to about 10 parts by weight additional surfactant;
(D) optionally mixing therewith about 2 to about 8 parts by weight corrosion inhibitor;
(E) optionally mixing therewith about 0.2 to about 1 part by weight defoamer;;
(F) optionally mixing therewith about 2 to about 10 parts by weight stabilizer.
8. A method of treating a cured rubber, expandable, toroidal shaped, pneumatic tire cure bladder for a pneumatic or semi-pneumatic tire which comprises coating the outer, exposed surface of the bladder in about 80 to about 150 percent of its tire curing expanded condition with the composition of Claim 3 drying said composition.
9. The method of Claim 8 where the bladder is of the butyl-type rubber.
10. The method of Claim 9 where the said polydimethylsiloxane is hydroxyl capped.
11. A method of molding a pneumatic or semipneumatic tire which comprises the steps of
(A) providing or building a green tire with elements which are to be its outer tread for ground-contacting purposes, two spaced inextensible beads, sidewalls extending radially outwardly from said beads to join said tread, supporting carcass with reinforcing elements, and an inner surface of rubber gum stock;
(B) inserting said green tire into a tire mold press and positioning a coated tire cure bladder of
Claim 5 inside of said green tire, said bladder being attached to an internal portion of said tire press;
(C) closing the tire mold and expanding said coated tire cure bladder by internal, heated fluid outwardly against the inner gum stock surface of said tire to press the tire outward under conditions of heat and pressure to shape and cure said tire; and
(D) opening the tire mold, collapsing said bladder and removing the cured tire having a generally toroidal shape therefrom.
12. The method of Claim 11 where the bladder is of butyl or butyl-type rubber.
13. The method of Claim 12 where the polydimethylsiloxane for said coat composition is hydroxyl capped.
14. The method of Claim 12 or 13 where said bladder is expanded with its said coating pressed directly against said inner surface of said tire.
15. A composition as claimed in Claim 1 substantially as described in the foregoing
Example.
16. A bladder as claimed in Claim 5 or 6 substantially as described in the foregoing
Example.
17. A method as claimed in Claim 7 substantially as described in the foregoing
Example.
18. A method as claimed in Claim 8 substantially as described in the foregoing
Example.
19. A method as claimed in Claim 11 substantially as described in the foregoing
Example.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US21265880A | 1980-12-03 | 1980-12-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2088898A true GB2088898A (en) | 1982-06-16 |
GB2088898B GB2088898B (en) | 1984-09-05 |
Family
ID=22791943
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8133846A Expired GB2088898B (en) | 1980-12-03 | 1981-11-10 | Tire curing bladder treatment lubricants coated bladders and method of curing tires |
Country Status (13)
Country | Link |
---|---|
JP (1) | JPS57119992A (en) |
AU (1) | AU554060B2 (en) |
BR (1) | BR8107712A (en) |
CA (1) | CA1217293A (en) |
DE (2) | DE3152328A1 (en) |
ES (1) | ES8303185A1 (en) |
FR (2) | FR2495181B1 (en) |
GB (1) | GB2088898B (en) |
IT (1) | IT1172080B (en) |
LU (1) | LU83805A1 (en) |
MX (1) | MX159224A (en) |
MY (1) | MY8600005A (en) |
ZA (1) | ZA817549B (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0160537A2 (en) * | 1984-04-27 | 1985-11-06 | Toray Silicone Company Limited | Method for lubricating tire-molding bladders |
US4863650A (en) * | 1982-10-16 | 1989-09-05 | Teroson G.M.B.H. | Process for molding and vulcanizing tires and other rubber articles |
WO2004067687A3 (en) * | 2003-01-17 | 2004-11-04 | Edward B Kollin | Lubricants for run-flat tire systems |
US20170036408A1 (en) * | 2014-04-30 | 2017-02-09 | Pirelli Tyre S.P.A. | Process for producing tyres provided with auxiliary components for vehicle wheels |
WO2021123678A1 (en) * | 2019-12-20 | 2021-06-24 | Elkem Silicones France Sas | Method for vulcanizing a green tire using an organopolysiloxane-based mold release agent lubricant composition |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU567899B2 (en) * | 1983-04-12 | 1987-12-10 | Dexter Corporation, The | Process for molding and vulcanizing rubber articles |
JPH02311564A (en) * | 1989-05-25 | 1990-12-27 | Toray Dow Corning Silicone Co Ltd | Bladder lubricant composition for tire molding |
DE4024565C1 (en) * | 1990-08-02 | 1992-02-13 | Grace Service Chemicals Gmbh, 6900 Heidelberg, De | Aq. slip and mould-release agent for tyre mfr. |
DE10249386B3 (en) * | 2002-10-23 | 2004-07-08 | Pingo Erzeugnisse Gmbh | Metal fire prevention and protection agent, useful as class D fire inhibitor and extinguisher for e.g. light metal or alkali metal, is anhydrous emulsion of at least dihydric alcohol in polydimethylsiloxane, stabilized with emulsifier |
JP6476980B2 (en) | 2015-02-20 | 2019-03-06 | 信越化学工業株式会社 | Release agent for tire bladder, tire bladder and pneumatic tire |
JP6226912B2 (en) * | 2015-06-10 | 2017-11-08 | 松本油脂製薬株式会社 | Release agent for tire inner surface |
CN115008946A (en) * | 2017-02-08 | 2022-09-06 | 横滨橡胶株式会社 | Pneumatic tire |
FR3064527A1 (en) | 2017-03-30 | 2018-10-05 | Compagnie Generale Des Etablissements Michelin | COOKING MEMBRANE FOR PNEUMATIC |
JP6920926B2 (en) * | 2017-08-30 | 2021-08-18 | ライオン・スペシャリティ・ケミカルズ株式会社 | Tire inner surface mold release agent, tire inner surface mold release agent water dispersion, tire manufacturing method, and tire |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1043143A (en) * | 1950-08-23 | 1953-11-06 | Dow Corning | Release composition |
US2937406A (en) * | 1959-03-20 | 1960-05-24 | Goodyear Tire & Rubber | Fluid pressure core |
NL136855C (en) * | 1968-10-07 | |||
CA962390A (en) * | 1971-06-01 | 1975-02-04 | Dow Corning Corporation | Aqueous siloxane bag lubricant for tire molding |
US4043924A (en) * | 1973-06-07 | 1977-08-23 | General Electric Company | Water based green tire lubricant |
GB1470306A (en) * | 1973-06-07 | 1977-04-14 | Gen Electric | Water based green tyre lubricant |
US3932255A (en) * | 1973-06-22 | 1976-01-13 | The Goodyear Tire & Rubber Company | Method of making an improved tire building sleeve and said sleeve |
US4039143A (en) * | 1975-01-06 | 1977-08-02 | General Electric Company | Organic hydrocarbon solvent-based green tire lubricant and process |
US4125470A (en) * | 1976-04-02 | 1978-11-14 | Dow Corning Corporation | Band-ply lubricant concentrates |
-
1981
- 1981-10-30 ZA ZA817549A patent/ZA817549B/en unknown
- 1981-11-03 ES ES506796A patent/ES8303185A1/en not_active Expired
- 1981-11-10 GB GB8133846A patent/GB2088898B/en not_active Expired
- 1981-11-18 JP JP56183924A patent/JPS57119992A/en active Pending
- 1981-11-18 MX MX190180A patent/MX159224A/en unknown
- 1981-11-19 IT IT49736/81A patent/IT1172080B/en active
- 1981-11-20 FR FR8121747A patent/FR2495181B1/en not_active Expired
- 1981-11-20 DE DE3152328A patent/DE3152328A1/en not_active Ceased
- 1981-11-20 AU AU77688/81A patent/AU554060B2/en not_active Ceased
- 1981-11-20 DE DE19813146053 patent/DE3146053A1/en not_active Ceased
- 1981-11-27 BR BR8107712A patent/BR8107712A/en unknown
- 1981-12-02 CA CA000391326A patent/CA1217293A/en not_active Expired
- 1981-12-02 LU LU83805A patent/LU83805A1/en unknown
-
1982
- 1982-04-01 FR FR8205633A patent/FR2499461B1/fr not_active Expired
-
1986
- 1986-12-30 MY MY5/86A patent/MY8600005A/en unknown
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4863650A (en) * | 1982-10-16 | 1989-09-05 | Teroson G.M.B.H. | Process for molding and vulcanizing tires and other rubber articles |
EP0160537A2 (en) * | 1984-04-27 | 1985-11-06 | Toray Silicone Company Limited | Method for lubricating tire-molding bladders |
EP0160537A3 (en) * | 1984-04-27 | 1987-07-29 | Toray Silicone Company Limited | Method for lubricating tire-molding bladders |
WO2004067687A3 (en) * | 2003-01-17 | 2004-11-04 | Edward B Kollin | Lubricants for run-flat tire systems |
US7040367B2 (en) * | 2003-01-17 | 2006-05-09 | Kollin Edward B | Lubricants for run-flat tire systems |
US20170036408A1 (en) * | 2014-04-30 | 2017-02-09 | Pirelli Tyre S.P.A. | Process for producing tyres provided with auxiliary components for vehicle wheels |
US10843425B2 (en) * | 2014-04-30 | 2020-11-24 | Pirelli Tyre S.P.A. | Process for producing tyres provided with auxiliary components for vehicle wheels |
WO2021123678A1 (en) * | 2019-12-20 | 2021-06-24 | Elkem Silicones France Sas | Method for vulcanizing a green tire using an organopolysiloxane-based mold release agent lubricant composition |
Also Published As
Publication number | Publication date |
---|---|
JPS57119992A (en) | 1982-07-26 |
IT8149736A0 (en) | 1981-11-19 |
ES506796A0 (en) | 1983-02-01 |
DE3152328A1 (en) | 1983-01-20 |
FR2499461B1 (en) | 1985-08-23 |
ZA817549B (en) | 1982-10-27 |
FR2495181A1 (en) | 1982-06-04 |
BR8107712A (en) | 1982-08-24 |
FR2499461A1 (en) | 1982-08-13 |
IT1172080B (en) | 1987-06-18 |
LU83805A1 (en) | 1982-05-07 |
CA1217293A (en) | 1987-01-27 |
AU7768881A (en) | 1982-09-23 |
AU554060B2 (en) | 1986-08-07 |
FR2495181B1 (en) | 1986-05-09 |
MX159224A (en) | 1989-05-08 |
ES8303185A1 (en) | 1983-02-01 |
GB2088898B (en) | 1984-09-05 |
DE3146053A1 (en) | 1982-08-05 |
MY8600005A (en) | 1986-12-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19921110 |