JP3392448B2 - Automotive tubes and methods of reducing oil fumes during vulcanization of tubes. - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an air impermeable rubber composition. More specifically, the present invention relates to a rubber composition containing an isobutylene-isoprene copolymer rubber as a main component, which is preferably used for an automobile tube, an inner liner of a pneumatic tire, and the like, and has a small amount of oily smoke during production.

[0002]

2. Description of the Related Art Since inner linings for automobile tubes and pneumatic tires are required to have excellent air impermeability, isobutylene-isoprene copolymer rubber is mainly used, and particularly for the purpose of improving productivity. Since the vulcanization of the tube is often performed at a high temperature, the amount of oil smoke generated during the vulcanization is large, and the working environment of the tube manufacturing factory is generally worse than that of the tire manufacturing factory. Therefore, although measures such as local exhaust and dust collectors have been taken, it is not sufficient yet, and it is necessary to take measures from the aspect of compounding.

[0003]

DISCLOSURE OF THE INVENTION The object of the present invention is to solve a bad working environment due to oil smoke during vulcanization of an air-impermeable rubber composition containing an isobutylene-isoprene copolymer rubber as a main component from the viewpoint of compounding. An object of the present invention is to provide a tube for automobiles and a method for reducing oil fumes during tube vulcanization.

[0004]

In order to solve the above-mentioned problems, the present inventor has analyzed the components of oil fumes in detail, and found that the tubes for automobiles have improved extrusion workability and increased amount when unvulcanized. A relatively large amount of naphthenic oils and paraffinic oils are blended for the purpose of, but it was confirmed by confirming that the main component of oil smoke is caused by these oils, and solving the problems by specifying the characteristics of this oil. The present invention has been completed based on the finding that they can be obtained.

That is, the present invention relates to (1) isobutylene-
In a constant temperature air bath having a kinematic viscosity at 100 ° C. of 20 centistokes or less and 190 ° C. per 100 parts by weight of a rubber containing 70 parts by weight or more of an isoprene copolymer rubber and / or a halogenated isobutylene-isoprene copolymer rubber. 20 minute hold was reduced percentage after not more than 0.5 wt.% paraffinic oil 10-50 parts by weight blended formed from a rubber composition comprising the vulcanizing temperature 185 ° C. or higher in the treated automotive tubing Is. (2) 10 parts with respect to 100 parts by weight of rubber containing 70 parts by weight or more of isobutylene-isoprene copolymer rubber and / or halogenated isobutylene-isoprene copolymer rubber.
10 paraffin oils having a kinematic viscosity at 0 ° C. of 20 centistokes or less and a weight loss ratio of 0.5 wt% or less after being kept in a constant temperature air bath at 190 ° C. for 20 minutes were used.
Approximately 50 parts by weight of unvulcanized molded tube 18
A method for reducing oily smoke during vulcanization of an automobile tube, which is characterized by vulcanizing at a high temperature of 5 ° C or higher.

As the rubber used in the present invention, isobutylene-isoprene copolymer rubber and / or halogenated isobutylene-isoprene copolymer rubber should be contained in an amount of 70 parts by weight or more from the viewpoint of air impermeability. is necessary. If it is less than 70 parts by weight, the air impermeability is deteriorated, which is not preferable. The rubber blended with these rubbers is not particularly limited, but ethylene-propylene copolymer rubber is preferable.

In the present invention, the paraffinic oil used has a kinematic viscosity of 20 centistokes or less at 100 ° C. and a weight loss ratio of 0.5% by weight or less after being kept in a high temperature air bath at 190 ° C. for 20 minutes. Preferably 0.3
It must be less than or equal to wt% oil.

For example, Fuji Kosan's Fucole Process Oil P-100 and Fucole Process Oil P-2
00, Kyoseki Process Oil P-200, FUKKOR Process Oil P-300, FUKKOR Process Oil P-
400, Idemitsu Kosan Diana Process Oil PS-3
2, Diana Process Oil PX-32, Diana Process Oil PW-90, Diana Process Oil PW-
150, Nippon San Oil Sampa-107, Sampa-11
0, Sampa-115, Sampa-120, Sampa-13
0, Sampa-150, Sampa-180, Sampa-210
0,

Shell Chemical's Lebreck 26, Lebreck 100, Shelf Rex 371N, Shelf Rex 100S, Shelf Rex 100SA, Shelf Rex 220S, Shelf Rex 220RS, Shelf Rex 260, Nippon Petroleum Comorex EL-3.
0, Comorex 2T, Kyoseki Process Sonic P-200, Kyoseki Process Sonic P-300, Mitsubishi Petroleum Mitsubishi 10 Light Process Oil, Esso Petroleum Flexon 845, Flexson 865, Flexson 815,
There are stanol 43N and the like, and these may be used alone or in combination of two or more kinds.

If the kinematic viscosity exceeds 20 centistokes, the unvulcanized viscosity of the obtained rubber composition becomes too high, and the extruding workability and molding workability are deteriorated, which is not preferable. If the weight loss ratio after holding in a constant temperature air bath at 190 ° C. for 20 minutes exceeds 0.5% by weight, the amount of oily smoke generated during vulcanization becomes too large, which is not preferable.

The amount of these oils blended is 100% rubber.
It is 10 to 50 parts by weight with respect to parts by weight. Compounding amount is 1
If the amount is less than 0 parts by weight, the viscosity at the time of unvulcanization becomes too high and the extruding workability deteriorates, which is not preferable.
When it exceeds the weight part, not only the amount of oily smoke increases but also the physical properties after vulcanization deteriorate.

In the present invention, if necessary, in addition to the oils described above, fillers such as carbon black, silica and calcium carbonate, vulcanization accelerating aids such as zinc white and stearic acid,
Compounding agents usually used in the rubber industry such as anti-aging agents, softening agents and vulcanizing agents can be appropriately used.

[0013]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. The weight loss ratio of each oil shown in Table 1 after 190 minutes at 190 ° C. was calculated according to JIS K 2207,
The results are shown in Table 1.

Next, various rubber compositions having the compounding contents shown in Table 1 were kneaded to prepare an unvulcanized tube of size TBR12.00R14. At that time, the extruding workability such as the heat-injecting property and the compatibility of the die at the time of extruding was evaluated. Further, these unvulcanized tubes were vulcanized at a vulcanization temperature of 185 ° C. for 10 minutes, then taken out from the mold, and the generated oil smoke concentration was measured by a Shibata Scientific Digital Dust Meter. The results are shown in Table 1 as an index with the conventional example being 100.
The smaller the value, the smaller the amount of oil smoke generated.

[0015]

[Table 1] It is clear from Table 1 that the rubber composition of the present invention has a small amount of oily smoke generated during vulcanization while maintaining good extrusion workability, and that the working environment of the factory is significantly improved.

[0016]

EFFECT OF THE INVENTION The air-impermeable rubber composition of the present invention can significantly reduce the amount of oily smoke generated during vulcanization while maintaining excellent extrusion workability in molding, and significantly reduce the working environment of the factory. Can be improved.

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) C08L 23/00-23/36 C08K 5/01 C08L 91/00 B60C 5/02-5/08 B60C 1/00

Claims (2)

(57) [Claims] 1. A kinematic viscosity at 100 ° C. of 20 centistokes or less with respect to 100 parts by weight of a rubber containing 70 parts by weight or more of an isobutylene-isoprene copolymer rubber and / or a halogenated isobutylene-isoprene copolymer rubber. A vulcanization temperature of 185 ° C or higher formed from a rubber composition containing 10 to 50 parts by weight of paraffin-based oil having a weight loss ratio of 0.5% by weight or less after being kept in a constant temperature air bath at 190 ° C for 20 minutes. Automotive tubes treated at high temperatures. 2. A kinematic viscosity at 100 ° C. is 20 centistokes or less with respect to 100 parts by weight of a rubber containing 70 parts by weight or more of an isobutylene-isoprene copolymer rubber and / or a halogenated isobutylene-isoprene copolymer rubber. An unvulcanized molded tube obtained by blending 10 to 50 parts by weight of paraffin-based oil whose weight loss ratio after holding in a constant temperature air tank at 190 ° C for 20 minutes is 0.5% by weight or more at a temperature of 185 ° C or higher. Self characterized by being vulcanized with
A method for reducing oil fumes during vehicle tube vulcanization.