MXPA06001977A

MXPA06001977A - Process for manufacturing tires having one or a plurality of inner sections, and products obtained therewith.

Info

Publication number: MXPA06001977A
Authority: MX
Inventors: Ignacio Alvarado Escalante
Original assignee: Ignacio Alvarado Escalante
Priority date: 2006-02-20
Filing date: 2006-02-20
Publication date: 2006-08-07

Abstract

Described herein is a process for manufacturing tires having one or a plurality of inner sections by means of a process for roto-molding or molding a thermosetting polymeric liquid resin or thermoplastic solid resin, which results in a tire having one or a plurality of inner sections made of a polyurethane thermosetting or thermoplastic elastomeric material. The inventive tires have the capability of being reconstituted in case of presenting any perforation caused by bullet impacts, punching or sharp elements, etc, thereby self-sealing the perforation and preventing the air from flowing, as well as allowing the tire to continue to roll.

Description

PROCEDURE FOR MANUFACTURING TIRES OF ONE OR SEVERAL INTERNAL SECTIONS AND RESULTING PRODUCTS.

FIELD OF THE INVENTION The present invention relates to a novel process for manufacturing rims of one or several internal sections and, more particularly, with a molding or rotomolding process of polymeric liquid resin or thermoplastic solid for the manufacture of a rim of one or several internal sections made of polyurethane elastomeric material, which, when perforated by bullet impact, sharp or sharp pieces, etc., has the peculiarity of reconstituting itself by self-sealing said perforations, thus preventing the release of air and allowing its running to continue.

BACKGROUND OF THE INVENTION Various types of processes are known for the manufacture of chambers, covers and rims for vehicles, whose chambers, covers and rims are manufactured by different processes, with materials of different chemical formulations, which do not have the peculiarity of being a rim of elastomeric material thermoplastic or polyurethane thermoplastic of one or several internal sections. Likewise, there are pasty flowing compounds, not rigid olies, which are encapsulated between two layers that are inside a rim, being a different process, these pasty compounds are of different physical structures and have different chemical formulations, they do not have the peculiarity of being an elastomeric thermofixed or thermoplastic polyurethane tire of one or several internal sections of polyurethane elastomeric material, providing another type of sealing mechanism. Examples of these pasty compounds are those of Mexican patent 183,487 entitled "Sealant formulation of Perforations"; US Patent Application 9022001992/06/22 in which high molecular weight polymers are claimed as low molecular weight elastomers and a crosslinking agent; European application 01917627 entitled "Anti-perforation sealing agent, tires without air chamber and pneumatic air chamber"; Chinese Patent 1 350493, 1350494 and 1425051; US application series 1 0 / 239,872; US Patent 6,868,881 B1; European patents 1 1 8058 A1, 1 065042 A1, 081 6, 1 32 A, 1281 741 A1; and European application 99901 959 entitled "Procedure for manufacturing tires with sealing agents and tires with oil-tightness", etc. Summarizing in these patents and applications encapsulated sealants are claimed that cover only the bottom of the rim, that is, viscous pastes that flow in the holes, sealing the punctures of a rim by another different mechanism. There are senators of punctures that are some emulsions of mixtures of liquids and solids of chemical formulation and different physical structures, with a different manufacturing process, such as those of the North American patent applications 200300674 and European 00948709 and 99118293; application P2000302719, patent LP 10017051; Japanese patents 2000104042, 57063374, 54008307, 2003193030; U.S. Patent Nos. 5,705,604, 5,124,395, 6,063,837, 6,283,172131, 5,856,376 and 6,454,892; U.S. Patent Application 2004 / 0048962A1 European Patent 1270188A1; International applications PCT / US92 / 00405, PCT / US00 / 19401, PCT / EP98 / 05807; British Patent 2370574; Japanese patent 2001301050, French patents 2735486 and 2727978; and applications PCT / US01 / 19548 and PCT / AU95 / 00487 etc. These patents and applications claim emulsions of mixtures of solids and liquids that are placed inside the tire, which serve to fill the punctures of the tire by a mechanism of Differently sealed, they do not have the peculiarity of being a rim made of elastomeric thermofixed material or thermoplastic polyurethane of one or several internal sections.

Other puncture sealers are sticky materials that do not flow, have a different physical structure and chemical compositions that are processed by a different process, such as those of European application 90001124, Chinese patents 1569501, North American 6864.305B2; European 1291156 and 0867494A2, etc. In these patents and applications, sticky coatings are described that do not flow in the inner layer of the tire, to seal punctures of the tire by another different mechanism that does not have the peculiarity of a tire. Elastomeric thermoplastic polyurethane tire or thermo-fix one or several sections.

Still more other sealants are made from solid powder mixtures having different chemical compositions and physical structures and are made by a different process, such as those of the US patents 6,506,730B1 and Taiwanese 472004, which describe mixtures of powders that are placed inside the tire sealing the punctures by a different mechanism that does not have the peculiarity of being an elastomeric rim of thermoplastic polyurethane or thermofix of one or several internal sections. . There are sealants that are manufactured with a different process, consisting of layers of mixtures of rubber butyl rubber, isoprene and various rubber varieties of different chemical composition and physical structure, for sealing punctures in tires by a different mechanism that does not have the peculiarity of being an elastomeric thermoplastic or thermoplastic polyurethane tire of one or several internal sections; such as those of the North American patents 2004/0159386 and 2003/3230376 and European 1457308A1. There are chambers that are manufactured with an elastomeric material of similar composition by a traditional molding process or by rotomoulding of liquid resins and whose resulting shape. of the rotational mold of the rotomoulding is not an elastomeric polyurethane rim of one or several sections and neither are they made of thermoplastic elastomeric material; such as that of the Mexican patent applications PA / a / 2005/010181 and PA / a / 2005/01 1805. OBJECTIVES OF THE INVENTION One objective of this invention is to provide a novel elastomeric thermoplastic polyurethane rim or thermoset one or several internal sections of polyurethane elastomeric material which can be thermoplastic or thermoplastic with recycling possibilities or the like, that when perforated by bullet impact, metal sharps, such as screws, nails, etc., and sharp pieces such as glass, sharp points , etc., has the peculiarity of reconstituting itself self-sealing said perforations, preventing the release of air and allowing its taxiing to continue. Another objective is to provide a procedure for making a rim of one or several internal sections. Still another objective is to provide a procedure for manufacturing rims of one or several internal sections, which is simple, easy to carry out, and of minimum duration of time and cost. DESCRIPTION A process for manufacturing a thermoplastic or thermoplastic polyurethane rim of one or more internal sections made by a molding or rotomolding process of thermoplastic solid resin or thermoset liquid resin to form an elatomer is described. thermoplastic ^ .or termofijo de ^ polyurethane that has the peculiarity of reconstitute and self-sealing perforations avoiding air leak caused by punctures, allowing the filming to continue. This procedure consists of the following steps: 1) heating a thermoplastic solid resin or a polymeric resin which is a mixture of the type used for the manufacture of flexible polyurethane elastomers, with an appropriate viscosity and temperature; 2) place the hot resin in a desired vacuum chamber; 3) mixing the hot polymer resin with another mixture of isocyanate and amine type catalysts, in a specific amount of any selected mixture of catalysts of this type, for a determined time at a desired speed; 4) to manufacture the blanket from one or several internal sections in a two-piece mold, empty an appropriate quantity of the previously heated and melted thermoplastic solid resin or else empty the mixture of polymer resin and catalysts in the previously prepared mold with a release agent , preheated to a specific temperature, and with the reinforcing cords for the rim installed inside the mold, the mold is made of any type of metal material or of various resins suitable for the manufacture of molds, molds, etc. .ásticas.I - close the mold; _ ) to make the rim of one or several internal sections in a rotomoulding machine with a two-piece mold, empty an appropriate quantity of the previously heated and melted thermoplastic solid resin or else empty the mixture of polymer resin and catalysts in the mold previously prepared with a release agent, preheated to a specific temperature, with the reinforcing cords for the rim installed inside the mold, the mold is made of any type of metallic material or of various resins suitable for the manufacture of molds for the casting of resins plastic, close and place the mold in the mold holder of a rotomoulding machine that has two different turns in a perpendicular direction with respect to each other and each rotation with a specified speed and time adjusting a suitable temperature for the resin; 6) allow the piece to cure at room temperature or by heating to a maximum temperature, for a desired period; 7) After this period, unmold the piece and let it rest for an appropriate period; 8) Insert the rim of one or more internal sections in the vehicle's rim and fill it with pressurized air, as specified on the vehicle's rim. PREFERRED MODALITIES OF THE INVENTION The present invention relates to a novel process for manufacturing rims of one or several internal sections and, more particularly, with a molding or rotomolding process of thermoset liquid or solid thermoplastic resin for the manufacture of a rim of a or several internal sections of thermoplastic elastomeric material or thermofixed polyurethane, which when perforated either by bullet impact, sharp or sharp pieces, etc., have the peculiarity of reconstitution by self-sealing said perforations, thus preventing the release of air and allowing your shooting to continue. In these embodiments, a method is described for making tires of one or several internal sections of thermoplastic elastomeric material or polyurethane thermofix. The process for manufacturing said rims of one or several internal sections of thermoplastic or thermoplastic elastomeric material that has the peculiarity of reconstituting itself by puncturing, in this embodiment is constituted by the steps of: 1) heating a thermoplastic thermoplastic elastomeric solid polyurethane resin with a density that varies from 0.850 to 1.650 grams per cubic centimeter at a temperature of 20 to 250 degrees centigrade or a thermoset polymeric resin that is a mixture of the type used for the manufacture of flexible polyurethane elastomers, with a viscosity that varies from 1000 to 25,000 entipoises, and -a at a temperature that varies from 20 to 130 degrees centigrade; 2) place the hot resin in a vacuum chamber, with a vacuum ranging from 1 to 34 inches of mercury, for a time ranging from 1 to 420 minutes; 3) Mix the hot thermoset polymer resin with another mixture of isocyanate and amine type catalysts, in an amount of 12 to 90% by weight of any selected mixture of such catalysts, for 3 to 25 minutes, at a rate of 30 to 5500 revolutions per minute; 4) to make the rim of one or several sections in a two-piece mold, empty a quantity of mixture that occupies 10 to 50% of the volume of the previously prepared mold with a release agent and preheated to a temperature of 20 to 130 degrees centigrade and with the reinforcing cords for the rim installed inside the mold, the mold is made of any type of metallic material or of diverse resins suitable for the manufacture of molds for the emptying of plastic resins, closing the mold; 5) to make the rim of one or several internal sections in a rotomolding machine with a two-piece mold, empty an amount that occupies 10 to 50% of the mold volume of the thermoplastic solid resin previously heated and melted or empty an amount that occupies 10 to 50% of the mold volume of the thermoset polymeric resin mixture and catalysts in the previously prepared mold with a release agent, preheated to a temperature of 2.0 to 130 degrees Celsius, with the reinforcing cords for the rim installed inside the mold, the mold is made of any type of metallic material or of diverse resins suitable for the manufacture of molds for the casting of plastic resins, close and place the mold in the mold holder of a rotomolding machine that has two different turns in a perpendicular direction with respect to each other and each rotation with a speed of 1 to 200 revolutions per minute for a time of 15 to 90 minutes and adjusting the resin to a temperature of 20 to 130 degrees centigrade; 6) let the piece cure at room temperature or heating up to a maximum of 120 degrees centigrade, for a period of 6 to 24 hours; 7) After this period, unmold the piece and let it rest for a period of 24 hours; 8) Insert the rim of one or more internal sections in the vehicle's rim and fill it with pressurized air, as specified on the vehicle's rim. With this procedure tires of one or more internal sections made of thermoplastic elastomeric material or polyurethane thermoset are obtained, with the following properties: any section of the tires can be extended or compressed repeatedly, returning to its original shape and size, reconstituting itself and self-sealing the perforations caused by bullet impacts, metal sharp pieces and sharp pieces of rigid materials, preventing the air from escaping from inside said rim, and allowing _ __co_n.tjDúe_ el. filming _d_e_ these rims. In other words, these sectioned tires have the peculiarity of being reconstituted by self-puncturing punctures caused by sharp or sharp objects on said rims. It will be apparent to those skilled in the art that modifications may be made to this invention, without deviating from or departing from the scope of the following claims:

Claims

R E I V I N D I C A C I O N S "1 .- Procedure for the design of a rim of one or several internal sections, made of thermoplastic elastomeric material or polyurethane thermoset, where any section of the rim or the chamber can be extended or compressed in repeated occasions returning to their original shape and measurements, reconstituting and self-sealing perforations in the same caused by bullet impacts, metal sharp pieces and sharp pieces of rigid materials, preventing air from escaping from inside said rim; the process being characterized by the following steps: 1) to manufacture the rim of one or several internal sections with thermoplastic solid resin to heat a thermoplastic elastomeric solid polyurethane resin with a density ranging from 0.850 to 1.650 grams per cubic centimeter at a temperature of 130 to 250 degrees centigrade;
2) to make the rim of one or more internal sections with thermoset polymeric resin to heat a polymeric resin which is a mixture of the type used for the manufacture of flexible polyurethane elastomers, with a viscosity ranging from 1000 to 25,000 centipoise, and a temperature that varies from 20 to 120 degrees centigrade;
3) to make the single or multi-section rim with thermoset polymeric resin place the hot resin in a vacuum chamber, with a vacuum ranging from 1 to 34 inches of mercury, for a time ranging from 1 to 420 minutes; , '
4) to make the rim of one or several sections with pjoJim erica resin, thermofix mix, the. resiaa__po-li.rnérica - hot with another mixture of isocyanate and amine type catalysts, in an amount of 12 to 90% by weight of any selected mixture of catalysts of this type, for 3 to 25 minutes, at a rate of 30 to 5500 revolutions per minute;
5) to make the rim of one or more sections with thermoset polymeric resin in a two-piece mold, empty a quantity of mixture that occupies 10 to 50% of the volume of the previously prepared mold with a release agent and preheated to a temperature of 20 to 1 30 degrees Celsius, with the reinforcing cords for the rim installed inside the mold, the mold is made of any type of metallic material or of diverse resins suitable for the manufacture of molds for the casting of plastic resins, closing the mold;
6) to manufacture the rim of one or more sections with solid thermoplastic resin in a two-piece mold, empty an amount of elastomeric polyurethane resin of the thermoplastic type that occupies 10 to 50% of the volume of the previously prepared mold with a release agent and preheated to a temperature of 20 to 1 30 degrees centigrade, with the reinforcing cords for the rim installed inside the mold, the mold is made of any type of metal material or of various resins suitable for the manufacture of molds for the casting of resins plastic, close the mold;
7) to make the rim of one or more internal sections in a rotomolding machine with solid thermoplastic resin in a mold with several pieces. - to add one. amount of the previously heated and melted thermoplastic elastomeric polyurethane resin that occupies 10 to 50% of the mold volume in the mold previously prepared with, a release agent, preheated to a temperature of 20 to 130 degrees centigrade, with the reinforcing cords for the rim installed inside the mold, the mold is made of any type of metal material or various resins suitable for the manufacture of molds for the emptying of plastic resins, close and place the mold in the mold holder of a rotomolding machine that has two different turns in a direction perpendicular to each other and each turn with a speed of 1 to 200 revolutions per minute for a time of 15 to 90 minutes and adjusting the resin to a temperature of 20 to 250 degrees centigrade;
8) to manufacture the rim of one or several internal sections in a rotomolding machine with thermoset polymeric resin in a two-piece mold, emptying an amount of the polymer resin mixture and catalysts that occupy 10 to 50% of the volume of the mold in the mold previously prepared with a release agent, preheated to a temperature of 20 to 130 degrees centigrade, with the reinforcing cords for the rim installed inside the mold, the mold is made of any type of metallic material or of various resins suitable for the manufacture of molds for the emptying of plastic resins, closing and placing the mold in the mold holder of a rotomolding machine that has two different turns in a perpendicular direction with respect to each other and each rotation with a speed of 1 to 200 revolutions per minute for a time of 15 to 90 minutes and adjusting the resin to a temperature of 20 to 130 degrees centigrade;
9) allow the piece to cure at room temperature or by heating up to a maximum temperature of 120 degrees centigrade, for a period of 6 to 24 hours;
10) After this period, unmold the piece and let it rest for a period of 24 hours; and 1 1) insert the rim of one or more internal sections in the vehicle's wheel and fill it with pressurized air, as specified on the vehicle's rim. 2. The process according to claim 1, characterized in that the thermoplastic solid resin is a solid elastomeric polyurethane resin of the thermoplastic type with a density ranging from 0.850 to 1.650 grams per cubic centimeter. 3. The process according to claim 1, characterized in that the thermoplastic resin is heated to a temperature ranging from 130 to 250 degrees centigrade. 4- The process according to claim 1, characterized in that the thermoset polymer resin is a mixture of the type of resins used in the manufacture of flexible polyurethane elastomers, with a viscosity ranging from 100 to 25,000 centipoise. 5- The process according to claim 1, characterized in that the thermoset polymer resin is heated to a temperature that varies from .2D to 13Q_grade.s_centí.gr.ado_s 6. - The method according to claim 1, characterized wherein the thermoset polymer resin is placed in a vacuum chamber having a vacuum ranging from 1 to 34 inches of mercury, for a time ranging from 1 to 420 minutes. 7. The process according to claim 1, characterized in that the isocyanate is any of the isocyanates used in the manufacture of flexible polyurethane elastomers. 8. The process according to claim 1, characterized in that the amine is of the type of amines used in the manufacture of flexible polyurethane elastomers. 9 '.- The procedure in accordance with the claim 1, characterized in that the resin mixture and the catalyst mixture are stirred for a period of 3 to 25 minutes, at a speed of 30 to 5500 revolutions per minute. 10. - The method according to claim 1, characterized in that to make the rim of one or more sections with thermoset polymeric resin in a two-piece mold, a quantity of mixture that occupies 10 to 50% of the volume is emptied. of the mold previously prepared with a release agent. eleven . - The method according to claim 1, characterized in that the mold is preheated to a temperature of 20 to 130 degrees centigrade, the mold has installed the reinforcement cords for the rim and is made of any type of material. divers_as _re.sinas__adeauadas__p.ara the manufacture of molds for the emptying of plastic resins. 12. The procedure according to the claim 1, characterized in that in order to manufacture the rim of one or more sections with thermoplastic solid resin in a two-piece mold, a quantity of elastomeric polyurethane resin of the thermoplastic type occupying 10 to 50% of the volume of the previously prepared mold with a demolding 13. - The method according to claim 1, characterized in that the mold is preheated from 20 to 1302C, the mold has installed the reinforcing cords for the rim and is made of any type of metal material or various resins suitable for the manufacture of molds for the emptying of plastic resins. 14. The method according to claim 1, characterized in that to make the rim of one or more internal sections in a rotomolding machine with thermoplastic solid resin in a two-piece mold, a quantity of the elastomeric polyurethane resin is emptied. Thermoplastic previously heated and melted that occupies 10 to 50% of the volume of the mold in the mold previously prepared with a release agent. 15. - The method according to claim 1, characterized in that the mold is preheated to a temperature of 20 to 130 degrees centigrade, with the reinforcing cords for the rim installed inside the mold, the mold is made of any type of metallic material or various resins suitable for the manufacture of molds for the emptying of plastic resins. 16. The procedure according to the claim 1, characterized in that the mold is placed in the mold holder of a rotomolding machine having two different turns in a perpendicular direction with respect to each other and each rotation with a speed of 1 to 200 revolutions per minute for a time of 15 to 90 minutes 17. - The method according to claim 1, characterized in that the temperature of the resin inside the mold is adjusted to a temperature of 20 to 250 degrees centigrade. 18. - The method according to claim 1, characterized in that to manufacture (rim one or several internal sections in a rotomolding machine with thermoset polymeric resin in a two-piece mold, an amount of the mixture of polymeric resin and catalysts that occupies 10 to 50% of the volume of the mold in the previously prepared mold with a release agent is emptied. 19. - The method according to claim 1, characterized in that the mold is preheated to a temperature of 20 to 130 degrees centigrade, with the reinforcing cords for the rim installed inside the mold, the mold is made of any type of metallic material or various resins suitable for the manufacture of molds for the emptying of plastic resins. 20. The method according to claim J characterized in that the mold is placed in the mold holder of a rotomoulding machine having two different turns in a perpendicular direction with respect to each other and each rotation with a speed of 1 to 200 revolutions per minute for a time of 15 to 90 minutes. 21. - The method according to claim 1, characterized in that the piece is allowed to cure at room temperature or heating up to a maximum temperature of 120 ° C, for a period of 6 to 24 hours. 22. - The method according to claim 1, characterized in that after curing the piece, it is demoulded and allowed to stand for a period of 24 hours, 23.- The procedure according to the claim 1, characterized in that the rim of one or several internal sections is inserted in the wheel of the vehicle and filled with air under pressure, according to what is specified on the vehicle rim. 24.- A rim of one or several internal sections of thermoplastic or thermoplastic polyurethane elastomeric material that is reconstituted by self-sealing perforations in them caused by bullet impacts, metal sharp pieces and sharp pieces of rigid materials, preventing the air from escaping from the interior characterized in that this rim is obtained by the method of claim 1.