JP5480141B2 - Tire using rubber composition - Google Patents

Description

The present invention relates to a tire using the rubber composition having reduced the amount of the rubber component.

  A rubber composition used for tires or the like contains a large amount of rubber as a raw material. For example, in the case of a pneumatic tire for passenger cars, 50% by mass or more of the rubber composition is composed of a rubber component in which natural rubber and synthetic rubber are blended. . Therefore, these rubber compositions and tires using the rubber compositions are affected by rising crude oil prices, rubber failure due to bad weather, etc., resulting in increased raw material costs and a difficult supply of stable products. There is a risk of becoming.

Moreover, in recent years, environmental problems tend to be emphasized globally. In particular, from the viewpoint of preventing global warming, regulations on CO ₂ emissions have been strengthened, and reductions in the use of petroleum resources have been demanded. The formation of a resource recycling society is required.

  Therefore, in order to reduce the amount of petroleum resources used when manufacturing tires, for example, Japanese Patent Application Laid-Open No. 2003-63206 describes a so-called eco-tire in which 75% by weight or more of the total weight is made of raw materials made of resources other than petroleum. ing.

  However, in the rubber composition and tire according to the above-mentioned conventional technology, although the amount of petroleum resources used can be reduced, the manufacturing process becomes complicated and the unit price of alternative raw materials for petroleum resources is high, so the manufacturing cost is not necessarily reduced. could not.

  In addition, when natural fiber or the like is used as an alternative raw material, there is room for improvement and selection of the alternative raw material from the viewpoint that the alternative raw material itself has room for use as a fuel / resource.

An object of the present invention is to advantageously solve the above-mentioned problems, and the tire of the present invention comprises at least a part of a rubber composition obtained by blending an extraction residue of soy milk with a rubber component. It is characterized by that. Thus, the usage-amount of the rubber component in a rubber composition can be reduced by mix | blending the okara which is a residue (soymilk extraction residue) after squeezing soymilk from soybean. Okara, which is a soy milk extraction residue, is an industrial waste with low availability that remains after the production of tofu, etc., and it is inexpensive and can be reduced in the amount of waste by blending it into a rubber composition. Therefore, it is suitable as an alternative raw material for rubber components (such as an extender for rubber compositions). Therefore, the portion of the conventional tire that is composed only of rubber is composed of a rubber composition that is blended with soymilk extraction residue, thereby reducing the amount of rubber used while maintaining tire performance and reducing environmental impact. Can be reduced.

Here, in the tire of the present invention, the moisture content of the extraction residue of the soymilk is 80% or less, particularly preferably 1 to 80%, more preferably 1 to 50%, and more preferably 1 to 30%. More preferably it is. When the moisture content of the soymilk extract residue is more than 80%, the soymilk extract residue and the rubber component do not mix well when kneaded, and the soymilk extract residue may not be used as an alternative raw material for the rubber component. Moreover, by setting the moisture content of the extraction residue of soy milk to 80% or less, the decay of the extraction residue of soy milk can be suppressed. On the other hand, when the moisture content of the extraction residue of soy milk is less than 1%, the energy required to reduce the moisture content of the extraction residue of soy milk to less than 1% increases and the production cost increases, and the extraction residue of soy milk increases. It becomes too dry and difficult to handle. The moisture content is a value calculated by evaporating the moisture of the soymilk extraction residue (okara) with a known heater and measuring the weight change before and after the evaporation with a known means such as a balance.

In the tire of the present invention, it is preferable that a particle size of the extraction residue of the soy milk is 0.02 to 300 μm. When the particle size is less than 0.02 μm, handling is difficult, and when the particle size is greater than 300 μm, the dispersibility in the rubber component is poor and the physical properties of the rubber composition are lowered. Here, when the particles of the extraction residue of the soymilk are aggregated to form a lump, the lump has a diameter of preferably 0.5 μm to 3 mm from the viewpoint of handleability and dispersibility. The particle diameter and diameter are determined by particle diameter measurement by laser diffraction (JIS Z8825-1). In the method by laser diffraction, the average of the major axis and minor axis (taken as a sphere) of particles is measured. Is the value obtained.

In the tire of the present invention, the blending amount of the soymilk extraction residue is preferably 0.2 to 30 parts by mass, more preferably 1 to 20 parts by mass with respect to 100 parts by mass of the rubber component. By setting the blending amount of the soymilk extraction residue to 0.2 parts by mass or more, it is possible to provide a tire using a rubber composition that can sufficiently achieve the reduction of environmental burden, which is an object of the present invention. Moreover, the tire using the rubber composition which has the performance close | similar to the rubber composition which does not use an alternative raw material can be provided because the compounding quantity of the extraction residue of soymilk shall be 30 mass parts or less.

  In the present specification, particles having an aspect ratio of 1 to 5 are called particles.

In the tire of the present invention, 30 to 65% by mass of the extraction residue of the soymilk is preferably protein, and more preferably 30 to 55% by mass is protein. This is because if the amount of protein in the extraction residue of soy milk is large, the extraction residue of soy milk may rot during transportation and storage until the drying treatment.

According to the present invention, without using complicated manufacturing processes, which can be produced at low environmental impact and low cost, using environmentally friendly rubber composition can be environmental load provides a low tire.

It is sectional drawing of an example of the tire of this invention.

<Rubber composition>
Below, the rubber composition of this invention is demonstrated in detail. The rubber composition according to the present invention is characterized in that the use amount of the rubber component is reduced by blending and kneading the extraction residue (okara) of soybean milk, which is a residue after squeezing soybean milk from soybean, into the rubber component. And

  Here, the rubber component is made of natural rubber, synthetic rubber, or a mixture thereof, and specific examples of the synthetic rubber include styrene-butadiene copolymer rubber (SBR), polybutadiene rubber (BR), and poly rubber. Examples include isoprene rubber (IR), acrylonitrile-butadiene copolymer rubber (NBR), chloroprene rubber (CR), and butyl rubber (IIR). The rubber composition of the present invention is optionally added to reinforcing fillers such as carbon black and silica, softeners such as aroma oil, vulcanization accelerators, vulcanization accelerators, anti-aging agents, etc. Additive may be included.

  The extraction residue of soymilk is the residue after squeezing soymilk from soybeans, which is discharged in the production process of tofu, etc., crushing soybeans soaked in water, adding water to the ground soybeans and boiled, This is the remaining residue that remains when producing soymilk by filtering. And the extraction residue of soy milk contains protein, fat, soluble nitrogen-free material, fiber, moisture, etc., and most of the extraction residue of soy milk discharged in the production process of tofu etc. is usually industrial It is discarded as waste. In addition, you may mix | blend the extraction residue of the soymilk which mixed the known antiseptic | preservative arbitrarily with a rubber component.

  The extraction residue of soy milk can be blended with the rubber component after adjusting the moisture content as necessary. Adjustment of the moisture content is known such as hot air drying, drum drying, filter press, hot plate drying, etc. It can carry out using the means of. Thus, by adjusting the water content, it is possible to prevent the decay of the extraction residue of soy milk and improve the storage stability, and to improve the kneadability between the extraction residue of soy milk and the rubber component.

  The rubber composition of the present invention is not particularly limited except that the extraction residue of the soymilk is blended with the rubber component, and can be produced, for example, as follows.

  If necessary, the extraction residue of soymilk whose water content is adjusted by a known drying means is blended into a rubber component together with an optional filler (carbon black or the like) and additives and kneaded. In addition, there is no restriction | limiting in particular in the preparation method of the rubber composition of this invention, For example, using a Banbury mixer, a roll, etc., the rubber component, the extraction residue of soy milk, and various compounding agents suitably selected as needed It can be prepared by kneading.

<Tire>
The tire of the present invention is characterized in that at least a part thereof is composed of the rubber composition, and other than that, it can be manufactured using the same manufacturing method as that of a normal tire.

  Next, the tire of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of an example of the tire of the present invention. The tire shown in FIG. 1 has a pair of bead portions 1, a pair of sidewall portions 2, and a tread portion 3 connected to both sidewall portions 2, and extends in a toroid shape between the pair of bead portions 1. The carcass 4 that reinforces the parts 1, 2, and 3 and the belt 5 that is located on the outer side in the tire radial direction of the crown portion of the carcass 4 are provided.

  In the illustrated tire, the carcass 4 is composed of a single carcass ply, and a main body portion extending in a toroid shape between a pair of bead cores (wires) 6 disposed in the bead portion 1, and each bead core 6. And a folded portion wound up radially outward from the inner side to the outer side in the tire width direction. In the illustrated example, the carcass 4 is composed of one carcass ply. However, in the tire of the present invention, a plurality of carcass plies may be provided.

  In the illustrated tire, the belt 5 is composed of two belt layers. However, in the tire of the present invention, the number of belt layers constituting the belt may be one or more, and is not limited thereto. Absent. Furthermore, the tire of the present invention may further include a belt reinforcing layer made of a rubberized layer of cords arranged substantially parallel to the tire circumferential direction on the outer side in the tire radial direction of the belt 5. Further, an interlayer rubber can be provided between the belt reinforcing layer and the belt reinforcing layer.

  And the tire of the example of illustration uses the rubber composition which mix | blended the extraction residue of the soybean milk mentioned above at least in the tread part 3. It is characterized by the above-mentioned.

  Examples of the member using the rubber composition include tread rubber, side rubber, base rubber, bead filler or stiffener located on the radially outer side of the bead wire, carcass and belt coating rubber, and the like.

  Moreover, as gas with which the tire of the present invention is filled, an inert gas such as nitrogen, argon, helium, etc. can be used in addition to normal or air having an adjusted oxygen partial pressure.

[Example]
Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples.

( Reference Examples 1-9)
Using a Banbury mixer, a rubber composition containing okara as an extraction residue of soymilk was prepared with the formulation shown in Table 1, and a known vulcanizing agent or the like (sulfur: 100 parts by mass of rubber component: 1 0.5 parts by mass, vulcanization accelerator: 2.9 parts by mass [CZ: 1.5 parts by mass, DPG: 1.2 parts by mass, DM: 0.2 parts by mass], ZnO: 2.0 parts by mass, stearin Acid: 1.0 part by mass, anti-aging agent 6C: 1.0 part by mass) and vulcanized by a conventional method, the elongation at break was measured by the following method. The results are shown in Table 1. In addition, “Okara content in the rubber composition” in the table is the following formula:
Okara content = Okara compounding amount / (rubber component compounding amount + carbon black compounding amount + okara compounding amount) × 100
The components (such as vulcanizing agents) with a small amount were ignored.

(Comparative Example 1)
Using a Banbury mixer, a rubber composition containing no okara was prepared according to the formulation shown in Table 1, and a known vulcanizing agent or the like (sulfur: 1.5 parts by mass relative to 100 parts by mass of rubber component) Sulfur accelerator: 2.9 parts by mass [CZ: 1.5 parts by mass, DPG: 1.2 parts by mass, DM: 0.2 parts by mass], ZnO: 2.0 parts by mass, stearic acid: 1.0 parts by mass Part, anti-aging agent 6C: 1.0 part by mass) and vulcanized by the usual method, and the elongation at break was measured by the following method. The results are shown in Table 1.

(Elongation at break)
For the vulcanized rubber obtained by vulcanizing the rubber compositions prepared in Reference Examples 1 to 9 and Comparative Example 1 at 160 ° C. for 15 minutes, using a strograph manufactured by Toyo Seiki Seisakusho Co., Ltd., a temperature of 25 ° C., The elongation at break was measured under the condition of a tensile speed of 100 mm / min.

* 1 Emulsion polymerization SBR, 38 parts by mass of aroma oil for 100 parts by mass of rubber component
* 2 N110 manufactured by Asahi Carbon Co., Ltd.
* 3 Okara: dried okara discharged from a tofu factory, adjusted for moisture content, moisture content 10-90%, composition [cellulose particles / short fibers: fat: protein = 5: 3: 10 ], Particle diameter (including particle diameter in an aggregated state) 2 to 500 μm

From Reference Examples 1 to 9 and Comparative Example 1 in Table 1, it was found that even when okara was added to the rubber composition as an extender, the elongation at break hardly deteriorated. In Reference Examples 6 to 8 having a high moisture content from the blended okara, the elongation at break hardly deteriorated, but it took time to knead (preparation of the rubber composition), and the energy efficiency during the production of the rubber composition was high. It was bad.

Claims (5)

A tire comprising at least a part of a rubber composition obtained by blending an extraction residue of soy milk with a rubber component . The tire according to claim 1, wherein a moisture content of the extraction residue of the soymilk is 80% or less . The tire according to claim 2, wherein a moisture content of the extraction residue of the soymilk is 1 to 80% . 2. The tire according to claim 1, wherein a particle size of the extraction residue of the soymilk is 0.02 to 300 μm . The tire according to claim 1, wherein a blending amount of the extraction residue of the soy milk is 0.2 to 30 parts by mass with respect to 100 parts by mass of the rubber component .

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