Method for producing recycled material, and tire and method for producing tire

Abstract

There is provided a method for producing a recycled material, whereby a recycled material can be efficiently obtained from a tire. The method for producing a recycled material according to the present invention includes a step of subjecting a tire to a gasification treatment to generate a gas containing a C1 gas from the tire, and a step of obtaining a recycled material containing at least one species selected from the group consisting of isoprene, butadiene, a butanediol compound, a butanol compound, a butenal compound, succinic acid, and polymers of these compounds by using the gas containing the C1 gas.

Claims

1. A method for producing a tire, the method comprising: a step of subjecting a tire to a gasification treatment to generate a gas comprising a C1 gas from the tire, the C1 gas comprising carbon monoxide gas, the gas comprising the C1 gas containing 69 mol % of CO.sub.x, said x in the CO.sub.x gas being 1x2, a H.sub.2/CO.sub.x ratio by mol % in the gas comprising the C1 gas being less than 1, a step of directly converting the C1 gas comprising carbon monoxide gas to at least one species selected from the group consisting of isoprene, butadiene, and polymers of these compounds by using a microbial catalyst without obtaining an intermediate substance between the C1 gas and the at least one species to obtain a recycled tire material comprising the at least one species selected from the group consisting of isoprene, butadiene, and polymers of these compounds, and a step of obtaining a tire by using the recycled tire material.

2. The method for producing a tire according to claim 1, wherein the tire to be used for the gasification treatment is a waste tire.

3. The method for producing a tire according to claim 1, wherein the gas comprising the C1 gas further comprises hydrogen gas.

4. The method for producing a tire according to claim 2, wherein the gas comprising the C1 gas further comprises hydrogen gas.

5. The method for producing a tire according to claim 1, wherein the microbial catalyst is a Clostridium microorganism.

6. The method for producing a tire according to claim 2, wherein a microorganism of the microbial catalyst is a Clostridium microorganism.

7. The method for producing a tire according to claim 3, wherein a microorganism of the microbial catalyst is a Clostridium microorganism.

8. The method for producing a tire according to claim 4, wherein a microorganism of the microbial catalyst is a Clostridium microorganism.

9. The method for producing a tire according to claim 8, wherein at least 80% by mass of the gas comprising the C1 gas and the hydrogen gas is the C1 gas and the hydrogen gas; said gasification treatment comprises heating said tire to 1300 C. to separate said tire into said C1 gas, carbonization carbon, and metallic components; the microbial catalyst is prepared by introducing a nucleic acid capable of coding 1,4-butanediol synthase into the Clostridium microorganism in the presence of the C1 gas; and in the step of obtaining a tire by using the recycled tire material, a tire constituent material other than the recycled tire material is used in addition to the recycled tire material, said tire constituent material comprising a carbonaceous pigment.

Description

EXAMPLE 1

(1) There was prepared a waste tire that had been used on a vehicle and had shallowed grooves on the surface thereof.

(2) The waste tire was separated into a gas containing a C1 gas, carbonization carbon, and metallic components by heating it up to 1300 C. The generated gas containing the C1 gas contained 69% in molar ratio of CO.sub.x gas and 30% in molar ratio of hydrogen gas.

(3) Subsequently, a recycled tire material was obtained by growing a microbial catalyst prepared by introducing a nucleic acid capable of coding isoprene synthase into a Clostridium microorganism, in the presence of the resulting gas containing the C1 gas. The recycled tire material was isoprene, and there was obtained a recycled tire in which about 70% of carbon components of the carbon monooxide component contained in the C1 gas had been converted into isoprene.

(4) Subsequently, the resulting recycled tire material was polymerized, forming a polyisoprene rubber. A retreated tire was obtained by using the resulting polyisoprene rubber as a rubber component for constituting a tire and processing the isoprene rubber as a main material. The resulting retreaded tire was nearly new and was capable of being used for vehicles, such as a car.

EXAMPLE 2

(5) In Example 1, the microbial catalyst was exchanged to a metal catalyst, and thereby about 80% of the carbon components contained in the C1 gas was converted into ethanol. Moreover, ethanol was subjected to a dimerization reaction at high temperature, so that a recycled tire material was obtained. The recycled tire material was butadiene, and there was obtained a recycled tire in which about 80% of carbon components of the carbon monooxide component contained in the C1 gas had been converted into butadiene.

(6) Subsequently, the resulting recycled tire material was polymerized together with styrene, forming a styrene-butadiene rubber. A retreated tire was obtained by using the resulting styrene-butadiene rubber as a rubber component for constituting a tire and processing the styrene-butadiene rubber as a main material. The resulting retreaded tire was nearly new and was capable of being used for vehicles, such as a car.

EXAMPLE 3

(7) In Example 1, the microbial catalyst was exchanged to a microbial catalyst prepared by introducing a nucleic acid capable of coding 1,4-butanediol synthase into a microorganism, and thereby about 70% of the carbon components contained in the C1 gas was converted into 1,4-butanediol. Moreover, 1,4-butanediol was subjected to a dehydration reaction at high temperature, so that a recycled tire material was obtained. The recycled tire material was butadiene, and there was obtained a recycled tire in which about 80% of carbon components of the carbon monooxide component contained in the C1 gas had been converted into butadiene.

(8) Subsequently, the resulting recycled tire material was polymerized together with styrene, forming a styrene-butadiene rubber. A retreated tire was obtained by using the resulting styrene-butadiene rubber as a rubber component for constituting a tire and processing the styrene-butadiene rubber as a main material. The resulting retreaded tire was nearly new and was capable of being used for vehicles, such as a car.

(9) Examples 1 to 3 show that a recycled material (e.g., a recycled tire material) capable of being used for obtaining a tire or the like can be obtained by obtaining a gas containing a C1 gas from a tire such as a waste tire, and then using the resulting gas containing the C1 gas. Examples 1 to 3 also show that a retreated tire can be obtained by obtaining a tire material (e.g., a recycled tire material) using a gas containing a C1 gas, and then using the resulting recycled tire material. Examples 1 to 3 show that a retreaded tire can be obtained from a tire, such as a waste tire.