JPH0735497B2 - Effective use of crushed particles of waste tires - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for effectively utilizing waste tire crushed particles, and more particularly, by rapidly curing the waste tire crushed particles together with 2-cyanoacrylate, the impact relaxation property and the light weight property are improved. The present invention relates to a method for producing a cured product having both of the above.

2. Description of the Related Art The amount of waste such as rubber products such as automobile tires, tubes, rubber sole shoes, other footwear, belts, hoses, and industrial products is enormous and tends to increase year by year. Out of rubber product waste, automobile tire waste (that is, waste tires) accounts for an outstanding proportion.

However, many automobile tires are made of synthetic rubber that is difficult to recycle (tubes can be regenerated), and recently, over 300,000 tons of waste tires are generated each year, making it difficult to dispose of them. Is the actual situation.

Of these rubber product wastes, only about 20% is recycled as recycled rubber. About 50% of rubber product waste is disposed of by landfill (crushed or shredded before landfill). As other disposal methods, methods such as incineration, gasification, dumping in the sea, atomization, and microbial treatment have been implemented or proposed.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention Although the method of disposing of waste tires by landfill is the mainstream of the disposal method, it is by no means preferable to use wastes with a small apparent specific gravity such as waste tires for landfill. In addition, it is becoming difficult to secure landfill sites.

Regarding the incineration of waste tires, the development of an incinerator that does not cause air pollution has been delayed, the stack is prone to corrosion, and the cost of the incineration is higher than expected.

Gasification of waste tires and microbial treatment are not yet technically complete.

The dumping of waste tires into the sea has been put to practical use for the purpose of artificial fish reefs, but there is a limit in quantity.

Minimized waste tires can be used as an asphalt admixture, but are still small in quantity.

The present invention, in view of the situation that the effective use of waste tires has been variously tried, but is still small in quantity,
The purpose was to expand the effective use of waste tires.

Means for Solving the Problems An effective use method of waste tire crushed particles of the present invention is a curable component composed of 2-cyanoacrylate and 0.2 in terms of diameter.
-10 mm of waste tire crushed particles or an aggregate component composed of the waste tire crushed particles and inorganic particles, so that the amount of the aggregate component used is 0.5 to 80 parts by weight relative to 1 part by weight of 2-cyanoacrylate, In addition, it is characterized in that it is mixed and cured immediately before use so that the 2-cyanoacrylate penetrates into the gaps of the aggregate components.

The present invention will be described in detail below.

2-cyanoacrylate, which is a curable component, has the formula Various R 2 in which R is an alkyl group, an alkenyl group, an alkynyl group, a cycloalkyl group, an aryl group, an alkoxyalkyl group, a tetrahydrofurfuryl group, etc.
Cyanoacrylate is used. The representative one is R
Is an alkyl 2-cyanoacrylate having 1 to 4 carbon atoms.

Although highly purified 2-cyanoacrylate has a property of being cured in a second, since waste tire crushed particles have a curing accelerating action, in the present invention, 2-cyanoacrylate itself is not necessarily highly purified. There is no need to use it. Even if a low-cost 2-cyanoacrylate having a curing speed of about a minute speed is used, rapid curability that does not hinder practical use can be obtained.

In the present invention, waste tire crushed particles are used as an aggregate component. Spent tires include not only used tires but also nonstandard products and recovered products that are produced during production.

Spent tires contain various compounding agents, which rather favor the 2-cyanoacrylate cure promoting effect.

Crushing of a waste tire is performed by means such as cutting and crushing. When cutting and crushing, it is also preferable that the waste tire is frozen. The particle size is 0.2 in diameter conversion.
-10 mm, preferably 0.3-5 mm.

As the aggregate component, it is preferable to use inorganic particles together with the above-mentioned waste tire crushed particles.

As the inorganic particles, for example, sand, gravel, crushed stone (of rocks and slag), fly ash, volcanic rubble, volcanic sand, hill stone, perlite, expanded clay, expanded shale, coal slag, expanded slag, pozzolan, etc. are used. . Crushed glass,
Crushed concrete, metal particles, and crushed earthenware can also be used. In this case, it is preferable that at least a part of the inorganic particles is silica sand in consideration of the particle size, the availability of a product having a certain quality, the cost, the compatibility with 2-cyanoacrylate, the strength after curing, and the like.

In addition to the crushed particles of waste tires and inorganic particles, organic aggregates such as particulate plastics and wood powder can be used together.

If water is attached to the aggregate component, curing may proceed during mixing with 2-cyanoacrylate, so it is desirable that the aggregate component is dried to such a degree that such trouble does not occur. Be done. Further, even when the aggregate component has a strong alkalinity, curing progresses when mixed with 2-cyanoacrylate, and therefore such an aggregate component should be avoided.

At least one of the curable component and the aggregate component may be blended with various additives such as a colorant, a viscosity modifier, a curing rate modifier, and fibers, if necessary. These additives may be prepared separately from the curable component and the aggregate component and added at the time of mixing the curable component and the aggregate component.

The mixing ratio of the aggregate component to 1 part by weight of 2-cyanoacrylate, which is a curable component, is 0.5 to 80 parts by weight. Since the inorganic particles often have a large specific gravity, the volume ratio of the aggregate component is usually not so large. Even in the above range, the combination ratio of the type of 2-cyanoacrylate that is a curable component and the waste tire crushed particles (or this and inorganic particles) that is an aggregate component shows the best performance for the purpose. Therefore, it is preferable to find out the optimum ratio in advance by preliminary examination.

The curable component and the aggregate component are mixed just before use. Since both can be easily mixed, in actual mixing, it is sufficient to simply shake, vibrate or simply rotate, without performing full-scale stirring with a rotary stirrer or the like.

The curable component is placed in advance in a suitable capsule or small container made of glass, pottery, plastics, etc., and this capsule or small container is placed in a container containing an amount of the aggregate component corresponding to it. Alternatively, the capsules or small containers can be broken just before use so that both can be mixed.

INDUSTRIAL APPLICABILITY The method of the present invention is applicable to new construction work in the field of civil engineering / construction, restoration work (defects, cracks, depressions, repairs, etc.), gap filling, production of molded products, adhesives for production of laminates, electrical Useful for insulating materials, sole repairs, and other applications.

When applying to the sole repair of worn casual shoes among the above applications, first wipe off the dirt on the sole and then sandpaper if necessary, then apply an adhesive to the outer circumference of the heel of the sole. After applying the attached sheet as a guide, mix 2-cyanoacrylate and waste tire crushed particles (or this and inorganic particles) with a spatula-like thing and put it on the worn part of the shoe sole and lightly press it, All you have to do is remove the guide after 10 seconds or a few minutes and finish the protruding part with sandpaper.

Action and effect of the invention When the curable component made of 2-cyanoacrylate and the aggregate component made of waste tire crushed particles or the same and inorganic particles are mixed and filled, coating or the like is performed, the curable component is rapidly released. The curing is started and a cured product is obtained. Heat generation is observed when the filling and coating amount is relatively large, but this heat generation rather contributes to the improvement of the curing rate. Having a rapid curing property is advantageous in terms of productivity. In addition, when targeting a specific part of a road, a site, or a building, the traffic regulation time for people and vehicles is minimized.

It is well known that 2-cyanoacrylate itself cures quickly, but when curing is performed using only 2-cyanoacrylate, the cured product has brittleness and is considerably brittle during curing (for example, about 10%). ) It causes contraction. However,
In a system in which 2-cyanoacrylate and waste tire crushed particles (or inorganic particles) are mixed and used, the strength of the cured product is increased, and the shrinkage ratio is also small enough not to impair practical use. It exerts unexpected effects. In addition, the obtained cured product has a certain degree of elasticity and contains crushed particles of waste tire having a small specific gravity, and therefore has both impact relaxation property and lightness.

2-Cyanoacrylate is generally expensive, but purity is not required so much for the purpose of the present invention, and it is used in combination with a large amount of aggregate component, and the cost of waste tire crushed particles out of the aggregate component is also the cost of inorganic particles. Is also cheap, so 2-
Despite the use of cyanoacrylate, the cost of the target product can be suppressed.

According to the present invention as described above, it is possible to effectively use a waste tire and obtain a cured product having excellent properties.

EXAMPLES Next, the present invention will be further described with reference to Examples. Hereinafter, “parts” means parts by weight.

Example 1 Roadway construction and pavement construction in the exhibition hall were performed as follows.

Ethyl 2-cyanoacrylate (a1) was prepared as a curable component (A).

As the aggregate component (B), waste tire crushed particles (b1) obtained by freeze crushing a waste tire to a size of approximately 0.3 mm,
The dried No. 5-7 silica sand (b2) was prepared.

0.5 volume of crushed particles (b1) of waste tires and 0.5 g of silica sand (b2)
After pouring 1 volume of ethyl 2-cyanoacrylate (a1) into a container holding the container, the container was rocked to mix both. On a weight basis, (a1): [(b1) + (b2)]
The ratio is about 1: 5. Since (a1) easily penetrates into the gap between both particles (b) and (b2), this mixing operation could be carried out smoothly and in a short time.

When the mixture after completion of the mixing operation was poured into a planned roadway laying site and a pavement laying site that were previously dug into the ground, a curing reaction started after a few minutes and some heat generation was also observed. Almost complete curing time
It took about 10 to 15 minutes, and immediately after that, even if a 10-ton truck passed on the road or people passed on the pavement, there was no problem. After the curing was completed, no gap due to shrinkage was generated between the cured product and the surrounding ground.

Example 2 A floor height adjustment work on a concrete surface was performed as follows.

0.6 volume of crushed particles of waste tire (b1) of Example 1 and silica sand (b
2) To a container containing 0.4 volume, 1 volume of ethyl 2-cyanoacrylate (a1) was poured, and then the container was shaken to mix both.

When the mixture after the mixing operation was applied to the concrete floor surface to a thickness of 5 cm, the curing reaction started after a few minutes. 5-
It hardened almost completely after 10 minutes, and there was no problem when a person walked on the surface. After the curing was completed, a part of the cured product was destroyed and the adhesiveness to the concrete surface was examined, but the adhesive strength was extremely large.

A new hardened floor surface was used as a material storage area, but the impact relaxation was better than the concrete floor surface.

Example 3 Example 2 was applied to an animal-shaped play equipment with a rough skeleton assembled in advance.
A mixture of curable materials having the above composition was applied and cured. This operation was repeated several times to complete the animal shape. Finally, a paint was sprayed on the surface for coating.

The playground equipment thus obtained (playground equipment on which children can ride and play) was much lighter in weight than that made of concrete, and had shock absorbing properties.

Example 4 After pouring 1.5 volumes of ethyl 2-cyanoacrylate (a1) into a container containing only 1 volume of the waste tire crushed particles (b1) of Example 1, the container was rocked to mix them. Hereinafter, a play equipment was manufactured in the same manner as in Example 3.

The play equipment obtained was lighter than the play equipment of Example 3 and had a high impact relaxation property.

Example 5 Waterproofing work on the rooftop of a building was performed as follows. After V-cutting cracks on the asphalt surface or concrete surface on the roof of the building, first pour only ethyl 2-cyanoacrylate (a1) into the cracks, and then
A curable material in which ethyl 2-cyanoacrylate (a1), waste tire crushed particles (b1) and silica sand (b2) were mixed at a volume ratio of 2: 1: 1 was poured onto the asphalt surface or the concrete surface. As a result, the waterproof repair work was completed in a very short time.

Claims (2)

[Claims] 1. A 2-cyanoacrylate 1 comprising a curable component consisting of 2-cyanoacrylate and a crushed particle of waste tire having a diameter of 0.2 to 10 mm or an aggregate component consisting of the crushed particle of the waste tire and inorganic particles. Characterized by mixing and curing immediately before use so that the amount of the aggregate component used with respect to parts by weight is 0.5 to 80 parts by weight and the 2-cyanoacrylate penetrates into the gaps of the aggregate component. Effective use of waste tire crushed particles. 2. The method according to claim 1, wherein the inorganic particles are silica sand.