TIRE RUBBER COMPOSITION AND TIRE, AND MANUFACTURING METHODS THEREOF

Abstract

A tire rubber composition in accordance with the present disclosure comprises diene rubber and comprises porous foamed glass particles of porosity not greater than 80%. A tire rubber composition manufacturing method in accordance with the present disclosure comprises an operation in which porous foamed glass particles of porosity not greater than 80% fabricated using foaming agent comprising powdered seashells is kneaded into diene rubber.

Claims

1-9. (canceled)

10. A tire rubber composition comprising: diene rubber; and porous foamed glass particles; wherein porosity of the foamed glass particles is not greater than 80%.

11. The tire rubber composition according to claim 10, wherein the foamed glass particles are present in an amount that is 0.5 part by mass to 20 parts by mass for every 100 parts by mass of the diene rubber.

12. The tire rubber composition according to claim 10, wherein average particle diameter of the foamed glass particles is less than 1000 m.

13. The tire rubber composition according to claim 10, wherein the major foamed glass particle components are SiO.sub.2, CaO, and Na.sub.2O.

14. The tire rubber composition according to claim 10, further comprising at least one species selected from among the group consisting of pulverized porous carbide, porous cellulose particles, and vegetative granules.

15. The tire rubber composition according to claim 10, wherein the porosity of the foamed glass particles is not less than 56%.

16. The tire rubber composition according to claim 10, wherein the porosity of the foamed glass particles is not greater than 75%.

17. The tire rubber composition according to claim 10, wherein the foamed glass particles are present in an amount that is 1 part by mass to 15 parts by mass for every 100 parts by mass of the diene rubber.

18. The tire rubber composition according to claim 10, wherein average particle diameter of the foamed glass particles is not less than 5 m but is less than 1000 m.

19. The tire rubber composition according to claim 18, wherein the average particle diameter of the foamed glass particles is not greater than 500 m.

20. The tire rubber composition according to claim 18, wherein the average particle diameter of the foamed glass particles is not less than 50 m.

21. The tire rubber composition according to claim 18, wherein the average particle diameter of the foamed glass particles is not less than 100 m.

22. A tire provided with a tread made up of the tire rubber composition according to claim 10.

23. A tire rubber composition manufacturing method comprising an operation in which porous foamed glass particles of porosity not greater than 80% fabricated using foaming agent comprising powdered seashells is kneaded into diene rubber.

24. The tire rubber composition manufacturing method according to claim 23, wherein at least inorganic waste material and the foaming agent serve as raw materials for the foamed glass particles.

25. A tire manufacturing method comprising: an operation in which the tire rubber composition manufacturing method according to claim 23 is used to fabricate the tire rubber composition; and an operation in which a green tire provided with a tread made up of the rubber composition is made.

Description

WORKING EXAMPLES

[0040] Working examples in accordance with the present disclosure are described below.

[0041] Rubber and compounding ingredients are indicated below.

TABLE-US-00001 Natural rubber RSS #3 Butadiene rubber BR01 manufactured by JSR Corporation Carbon black SEAST KH manufactured by Tokai Carbon Co., Ltd. (N339) Silica Nipsil AQ manufactured by Tosoh Silica Corporation Coupling agent Si 75 manufactured by Degussa Paraffin oil: Process P200 manufactured by JOMO Stearic acid LUNAC S-20 manufactured by Kao Corporation Zinc oxide Zinc Oxide No. 1 manufactured by Mitsui Mining & Smelting Co., Ltd. Antioxidant Antigen 6C manufactured by manufactured by Sumitomo Chemical Co., Ltd. Wax OZOACE 0355 manufactured by Nippon Seiro Co., Ltd. Vegetative granules SOFT GRIT #46 manufactured by Nippon Walnut Co., Ltd. (crushed walnut shells; D90 = 300 m) Porous cellulose Viscopearl-Mini manufactured by Rengo Co., particles Ltd. (average particle diameter 700 m) Foamed Glass Foamed glass particles having an average Particles 1 particle diameter of 100 m to 300 m and a porosity of 62% fabricated in accordance with Fabrication Example 1 Foamed Glass Foamed glass particles having an average Particles 2 particle diameter of 300 m to 500 m and a porosity of 65% fabricated in accordance with Fabrication Example 1 Hollow Glass Particles Glass Balloons GL-3 manufactured by Keiwa Rozai Co. Ltd. (hollow glass particles having an average particle diameter of 300 m to 600 m and a porosity of 84%) Glass Particles Glass particles having an average particle diameter of 300 m to 500 m fabricated in accordance with Fabrication Example 2 Vulcanization Soxinol CZ manufactured by Sumitomo accelerator: Chemical Co., Ltd. Sulfur: Powdered Sulfur manufactured by Tsurumi Chemical Industry Co., Ltd.

Fabrication Example 1: Foamed Glass Particles 1 and Foamed Glass Particles 2

[0042] A ball mill was used to pulverize Porous (porous foamed glass) manufactured by Tottori Resource Recycling, Inc., and this was graded, to obtain Foamed Glass Particles 1 and Foamed Glass Particles 2. Porous is soda-lime glass, the major components of which are SiO.sub.2, CaO, and Na.sub.2O. SiO.sub.2 was 62.00%, CaO was 24.70%, and Na.sub.2O was 8.6%. Besides SiO.sub.2, CaO, and Na.sub.2O, the constituents of Porous include K.sub.2O, Al.sub.2O.sub.3, Fe.sub.2O.sub.3, and so forth. Porous was manufactured by a procedure in which discarded glass bottles are crushed, this is pulverized, this is mixed with powdered seashells serving as foaming agent, and this is fired.

Fabrication Example 2: Glass Particles

[0043] A ball mill was used to pulverize discarded glass bottles, and this was graded to obtain Glass Particles.

Calculation of Porosity of Foamed Glass Particles 1 and Foamed Glass Particles 2

[0044] [00001]$\mathrm{Porosity}.Math.\left[\%\right]=\left(\mathrm{volume}.Math.\left[\mathrm{ml}\right].Math..Math.\mathrm{of}.Math..Math.\mathrm{pores}\right)/\left(\mathrm{bulk}.Math..Math.\mathrm{volume}.Math.\left[\mathrm{ml}\right].Math..Math.\mathrm{of}.Math..Math.\mathrm{sample}\right)100=\left\{\left(\mathrm{bulk}.Math..Math.\mathrm{volume}.Math.\left[\mathrm{ml}\right].Math..Math.\mathrm{of}.Math..Math.\mathrm{sample}\right)-\left(\mathrm{actual}.Math..Math.\mathrm{volume}.Math.\left[\mathrm{ml}\right].Math..Math.\mathrm{of}.Math..Math.\mathrm{sample}\right)\right\}/\left(\mathrm{bulk}.Math..Math.\mathrm{volume}.Math.\left[\mathrm{ml}\right].Math..Math.\mathrm{of}.Math..Math.\mathrm{sample}\right)100=.Math.\left\{1-\left(\mathrm{actual}.Math..Math.\mathrm{volume}.Math.\left[\mathrm{ml}\right].Math..Math.\mathrm{of}.Math..Math.\mathrm{sample}\right)/\left(\mathrm{bulk}.Math..Math.\mathrm{volume}.Math.\left[\mathrm{ml}\right].Math..Math.\mathrm{of}.Math..Math.\mathrm{sample}\right)\right\}100=\left\{1-\left(\mathrm{bulk}.Math..Math.\mathrm{specific}.Math..Math.\mathrm{gravity}.Math.\left[g.Math.\text{/}.Math.\mathrm{ml}\right].Math..Math.\mathrm{of}.Math..Math.\mathrm{sample}\right)/\left(\mathrm{true}.Math..Math.\mathrm{specific}.Math..Math.\mathrm{gravity}.Math.\left[g.Math.\text{/}.Math.\mathrm{ml}\right].Math..Math.\mathrm{of}.Math..Math.\mathrm{sample}\right)\right\}100$

[0045] Here, the true specific gravity of glass was taken to be 2.5.

Fabrication of Tires at the Various Examples

[0046] The compounding ingredients except for sulfur and vulcanization accelerator were added to rubber in accordance with TABLE 1, a Model B Banbury mixer manufactured by Kobe Steel, Ltd., was used to carry out mixing, and the rubber mixture was discharged. The rubber mixture was then mixed with sulfur and vulcanization accelerator in a Model B Banbury mixer to obtain unvulcanized rubber. A green tire employing the unvulcanized rubber as tread rubber was fabricated, and this was vulcanized to obtain a 185/65R14 tire. The tire was mounted on a 145.5 JJ wheel.

Braking Performance on Ice

[0047] Four tires were mounted on a 2000-cc 4WD vehicle, and the braking distance with operation of ABS when traveling at a speed of 40 km/h on an ice-covered road surface (temperature 33 C.) was measured (n=10 trials). Braking distances (averages of n=10 trials) of the respective Examples are shown as indexed relative to a value of 100 for the braking distance (average of n=10 trials) obtained at Comparative Example 1. The higher the index the shorter was the braking distance, and thus the better was the braking performance.

Stability in Handling in Snow

[0048] To evaluate stability in handling, a driver responsible for sensory testing drove the 4WD vehicle through a snow test course at high speed while paying attention to steering wheel response, driving stability, and so forth. Stability in handling was compared to that of Comparative Example 1 to determine whether it was better, in which case it was taken to be +2; somewhat better, in which case it was taken to be +1; equivalent thereto, in which case it was taken to be 0; somewhat worse, in which case it was taken to be 1; or worse, in which case it was taken to be 2.

Wear Resistance

[0049] A 2000-cc 4WD vehicle was driven 10000 km, the tires being rotated between left and right sides every 2500 km, following which the remaining groove depth at the tread of the four tires was measured. The average value for each respective example is shown indexed relative to a value of 100 for the average remaining groove depth at the tread of the four tires. The higher the index the better it was in terms of wear resistance.

TABLE-US-00002 TABLE 1 Comparative Comparative Comparative Working Working Working Comparative Comparative Working Example 1 Example 2 Example 3 Example 1 Example 2 Example 3 Example 4 Example 5 Example 4 Parts Natural rubber 50 50 50 50 50 50 50 50 50 by mass Butadiene rubber 50 50 50 50 50 50 50 50 50 Carbon black 25 25 25 25 25 25 25 25 25 Silica 25 25 25 25 25 25 25 25 25 Coupling agent 2 2 2 2 2 2 2 2 2 Paraffin oil 20 20 20 20 20 20 20 20 20 Stearic acid 2 2 2 2 2 2 2 2 2 Zinc oxide 2 2 2 2 2 2 2 2 2 Antioxidant 2 2 2 2 2 2 2 2 2 Wax 2 2 2 2 2 2 2 2 2 Vegetative granules 3 Porous cellulose 3 2 particles Foamed Glass 3 3 Particles 1 Foamed Glass 3 10 Particles 2 Hollow Glass 3 Particles Glass Particles 3 Vulcanization 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 accelerator Sulfur 2 2 2 2 2 2 2 2 2 Braking performance on ice 100 103 105 105 107 110 100 97 115 Stability in handling in snow Control 0 0 +2 +1 +1 0 1 +2 Wear resistance 100 98 98 110 105 103 93 95 110

[0050] Addition of foamed glass particles caused improvement in braking performance on ice, stability in handling in snow, and wear resistance. For example, addition of 3 parts by mass of Foamed Glass Particles 1 caused braking performance on ice to improve by 5 points, caused stability in handling in snow to become +2, and caused wear resistance to improve by 10 points (see Comparative Example 1 and Working Example 1).

[0051] Combined use of foamed glass particles and porous cellulose particles caused further improvement in braking performance on ice. For example, combined use of 3 parts by mass of Foamed Glass Particles 1 and 2 parts by mass of porous cellulose particles caused braking performance on ice to improve by 10 points (see Working Example 1 and Working Example 4).