ES2207995B1 - RECYCLING OF TIRES BY REVULCANIZATION OF THE RUBBER. - Google Patents

Abstract

Tire recycling by revulcanizing the rubber. The object of the invention is the recycling and use of rubber from discarded products, mainly tires. First, the discarded tires are subjected to a scraping process in order to extract the rubber, secondly the extracted rubber is mixed with black solution (commercially known thus). The mixture should be done evenly, beating or stirring continuously or at intervals of time until it is dry to the touch. In this way the mixture obtained is prepared to be vulcanized again and its use in the industrial field.

Description

Tire recycling by revulcanization of the rubber

Technical sector

The invention relates to a process of Tire recycling and other discarded rubber products.

Known background

Known is the concern in the sector Tire for giving a solution to the tires discarded

There are currently several processes known for tire recycling, which include the Crushed or ground of the tires.

These procedures are effective in terms of Destruction of tires, but have different inconveniences, the necessary facilities are very complex and They have a high economic cost, on the other hand the product The result is difficult to apply. The rubber that is obtained (chopped or ground) is used in the asphalt mixture, paints, manufacture of very low quality rubber products and resistance, etc. And in very small quantities.

Only by the exposed it is understood that hardly there are facilities of this type implanted, especially in Spain.

Which leads us to the conclusion of varying the investigations in the sense of taking full advantage of the rubber of old tires.

The object of the invention is to achieve a process whereby the rubber to be recycled can be vulcanized again, without lose their properties In this sense some are also known processes

Such processes whose objective is to revulcanize the rubber need complex mechanical installations and subsequently a series of mixtures such as solvents, binding agents, sulfur, silicones, plasticizers, rubber new, etc. So they are very expensive and according to cases not guarantee the quality of the resulting product. Neither do you have knowledge of the implementation of these processes in the field industrial.

Explanations

The object of the present invention is to achieve revulcanize the rubber from old tires or products rubber already vulcanized, through a simple, economical and Easy installation in the industrial field.

The main problem presented by the Revulcanization of already vulcanized gum is the loss of the greatest part of its original properties, greatly limiting its utilization. To mitigate this problem you can use several products according to vulcanization that usually improve quality of the Revulcanization, not yet getting all of its origin properties, but if making the process more expensive and discouraging its commissioning.

The present invention has as its final objective obtaining a revulcanized rubber with identical properties of the new rubber (virgin rubber) vulcanized, improving greatly Any previous process.

First of all the tires to recycle (discarded tires or any other discarded rubber product) they are subjected to a scraping process, for the extraction of the rubber to recycle. Mechanical process in which scrapers are used Conventional (scrapers used in it Retreaded or renewed of Tires) or manual rotaflex. Currently there are no Other types of scrapers.

Unlike other processes in which the rubber used is chopped or ground, in this it is essential that the rubber to be treated is scraped especially with scrapes or heads of nails or cactus.

Once the scraped rubber is obtained, it is mixed with a small part of black solution (well known commercially and also known as hot dissolution or self-vulcanizing), the mixture must be perfect by shaking or stirring until getting a uniform distribution of the solution, advising be in continuous motion until it is dry to the touch. Other acceptable method is to beat and let the mixture stand, repeating the process until total touch drying (four or five  times).

Through this simple process the mixture achieved (rubber, black solution and drying) is fully prepared for its Revulcanization in a manner and manner necessary according to subsequent applications.

For the Revulcanization of the mixture is used any system used in the vulcanization of new rubber (rubber virgin), the vulcanizing machines and vulcanization method are the same, varying in each specific case vulcanizing time, temperatures and pressures required according to interests.

The differences with other similar processes of Revulcanization are evident, highlighting:

to)

The Tires to recycle do not need a previous process, they are used as discarded.

b)

For the extraction of the rubber from old tires is essential use the scraping process, in no case is grinding or Chopping of the tires. Clarifying that the gum treatment scraping is the most important part of the process because tests performed on other tires (chopped, ground, rolled, etc.) cannot be vulcanized using only solution black (commercially known), on the contrary the same rubber proceeding to its scraping is totally vulcanizable.

C)

The black solution (commercially known as well as hot dissolution or self-vulcanizing) is the only additive necessary, being unnecessary any other product related to used material.

d)

He product resulting from the process described meets the qualities necessary for vulcanization, according to different requirements industrial and satisfactory results.

and)

The facilities needed to undertake the process are simple and economic. They do not need expensive machinery or facilities impressive, for the mix a single product is used, comfortable and economic.

To better understand the process, below is detail a series of tests performed, among many others.

As a starting material in all of them it has been used a scraped truck tire with manual rotaflex endowed of a scrape or nail head, for the extraction of the rubber (Sample 1).

Proof one

A mixture consisting of 100 grams is used of scraped rubber and 140 grams of black solution, beaten or removed until it is dry to the touch. For vulcanization a FONMAR brand vulcanizer, model RETU 2.800, temperature vulcanized between 145 ° C. And 150 ° C, pressure of 10 Kg. Cm2 and vulcanizing time of 30 minutes.

Proof 2

A mixture consisting of 100 grams is used of scraped rubber and 50 grams of black solution, beaten or renewed until it is dry to the touch, for vulcanization a FONMAR brand vulcanizer, model RETU 2.800, temperature vulcanized between 145 ° C and 150 ° C, pressure of 10Kg cm2 and vulcanizing time of 1 hour.

Proof 3

The same process as test 2 is used, varying only the vulcanizing time, which is increased up to 1'30 hours.

Proof 4

A mixture consisting of 150 grams is used of scraped rubber and 100 grams of black solution, beaten or removed until it is dry to the touch, for vulcanization a FONMAR brand vulcanizer model RECA 2,500, temperature approximately 160 ° C, pressure of 8Kg cm2, and time of vulcanized 1'15 hours.

Proof 5

The same process of test 4 is used, varying only the vulcanizing time, which decreases to 1 hour.

The vulcanizers used in the tests They are designed for tire repair. Vulcanizer FONMAR RETU 2,800 for repair of tourism tires and van and vulcanizer FONMAR RECA 2,500 for repair of Truck tires

This type of vulcanizer does not exert a completely uniform pressure on the vulcanized.

Having as reference the data and tests, it note that as the amount of black solution decreases Vulcanization time is increased to achieve same results, it is also observed that in the same test a part is better vulcanized than another blaming it for the lack of Totally uniform pressure on all parts.

Clarifying that for a preferred embodiment of the process use the procedures followed in TEST 1, taking into account that the rubber is extracted with rotaflex equipped with a scraper or nail head (sample 1), and a machine plate type vulcanizer, which guarantees a pressure uniform and both sides (top and bottom) are provided with heat for vulcanization

For all the above and results obtained in the multiple tests performed, the applicant intends to implement the process described in an industrial way as soon as possible, for the manufacture of products of rubber.

Claims (7)

1. Tire recycling by rubber revulcanization that involves recovering the rubber already vulcanized from tires and other rubber products discarded for industrial use, the starting material, such as Old tires mainly, is subjected to a process of scraped to remove the rubber. Then the rubber obtained passes to be mixed with black solution, known commercially, this mixture must be removed or beaten until uniformly mixed and dry to the touch. Once the rubber dries it is again suitable for vulcanization 2. Tire recycling by revulcanizing the rubber according to claim 1, characterized by the use as starting material of any type of rubber, mainly old tires, without the need for a previous process. 3. Tire recycling by revulcanizing the rubber according to claims 1 to 2, characterized by subjecting the starting material to a scraping process, as the only process for obtaining rubber that serves for its Revulcanization. 4. Tire recycling by revulcanizing the rubber according to claims 1 to 3, characterized in that any type of scrapers can be used for the extraction of the rubber by scraping, preferably provided with nail or cactus scrapes or heads. 5. Tire recycling by revulcanizing the rubber according to claims 1 to 4, characterized by the use of a black solution (commercially known and also known as hot or self-vulcanizing solution) as the only product necessary to mix with the scraped rubber, the others products such as: Silicones, solvents, plasticizers, sulfur, new rubbers, etc. Even being able to use are totally unnecessary. 6. Tire recycling by revulcanizing the rubber according to claims 1 to 5, characterized in that the mixture obtained (rubber and solution) must be mixed evenly, beaten or removed continuously or at intervals until it is dry to the touch. 7. Tire recycling by revulcanizing the rubber according to claims 1 to 6, characterized in that the resulting mixture is perfectly vulcanizable again in any vulcanizing machine, being able to vary pressures, vulcanizing temperatures and vulcanization times according to requirements.