JPH05239224A - Production of rubber roll - Google Patents

Abstract

PURPOSE:To produce a rubber roll excellent in wear resistance and durability. CONSTITUTION:An unvulcanized diene rubber composition containing disodium hexamethylene-1,6-thiosulfate is vulcanized with a sulfur-based vulcanizing agent to produce a rubber roll. By incorporating carbon black into the composition, a rubber roll further improved in strength, wear resistance, etc., can be produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rubber roll used for a lift roller, an iron-making roller or the like.

[0002]

2. Description of the Related Art Generally, a rubber roll is prepared by mixing an unvulcanized rubber with a filler such as carbon black, a softening agent, other auxiliary materials, and a sulfur-based vulcanizing agent and a vulcanization aid to prepare an unvulcanized sheet. It is manufactured by preparing, winding the unvulcanized sheet around an iron core, vulcanizing it in a vulcanizing tank, and polishing the surface (see FIG. 1).

On the other hand, rubber rolls used for lift rollers and steelmaking rollers are used under high load and high rotation, and are required to have durability in addition to the abrasion resistance required for the rollers. As a factor that hinders this durability, the contact surface between the sheet and the sheet when the unvulcanized sheet is wound around the iron core does not adhere sufficiently during vulcanization, that is, because the so-called co-rubber adhesiveness is poor, There is a phenomenon that peeling between rubber occurs at the interface corresponding to the contact surface.

Wear resistance is improved by filling with carbon black, but on the other hand, co-rubber adhesion is generally reduced by filling with carbon black. Therefore, it has been desired to develop a rubber roll that is excellent in durability without impairing wear resistance, that is, does not cause separation between rubbers.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for producing a rubber roll having excellent wear resistance and durability.

The present inventor has conducted research to achieve the above object, and when a specific compound is added to an unvulcanized rubber composition, co-rubber adhesion is dramatically improved, and as a result, carbon black is added. The inventors have found that a rubber roll having an improved balance of abrasion resistance and durability can be obtained even in the case where the above is performed, and have completed the present invention.

[0007]

That is, according to the present invention, there is provided a method for producing a rubber roll by vulcanizing a diene-based unvulcanized rubber composition containing a sulfur-based vulcanizing agent. The unvulcanized rubber composition is hexamethylene-1,6-
Provided is a method for producing a rubber roll, which is characterized by thiosulfate disodium salt (hereinafter abbreviated as HTS).

The most important feature of the present invention is to incorporate HTS as a component of the unvulcanized rubber composition. By compounding this compound, sufficient adhesion occurs at the sheet-to-sheet contact surface during vulcanization, and the rubber of the rubber roll obtained after vulcanization is less likely to peel off from the rubber, resulting in improved durability of the rubber roll. To do.

HTS is a compound represented by the formula (I), but of course, a hydrate can also be used.

The amount of HTS blended is usually 0.5 to 5.0 parts by weight, preferably 0. 0 parts by weight, based on 100 parts by weight of the diene rubber, from the viewpoint of achieving sufficient co-rubber adhesion and cost.
About 5 to 3.0 parts by weight is blended.

The diene rubber used in the present invention is butadiene rubber (BR), styrene / butadiene copolymer rubber (SBR), acrylonitrile / butadiene copolymer rubber (NBR), isoprene rubber (IR), natural rubber (N).
R), isobutylene / isoprene copolymer rubber (IIR)
As the high load / high rotation rubber roll, SBR, BR and NBR are preferable. These diene polymers can be used alone or in combination.

The vulcanizing agent used in the present invention is a sulfur type vulcanizing agent, and specifically, it is generally used as a vulcanizing agent for rubber such as powdered sulfur, highly dispersible sulfur and insoluble sulfur. It is sulfur, and is usually mixed in an amount of about 0.3 to 3.0 with respect to 100 parts by weight of the diene rubber.

It is preferable to use a vulcanization accelerator in combination with a sulfur-based vulcanizing agent in order to obtain a rubber roll having high strength. Usable accelerators are ordinary sulfur vulcanizing accelerators, such as thiazoles such as mercaptobenzothiazole (MBT) and dibenzothiazyl disulfide (MBTS), N-cyclohexyl-2-benzothiazolesphenamide (CBS). ), Nt-butyl-2-benzothiazole sulfenamide (BBS) and other sulfenamides, tetramethylthiuram monosulfide (TMT)
M), tetramethylthiuram disulfide (TMTM)
Such as thiurams, aldehydes and ammonia such as hexamethylenetetramine (H), diphenylguandin (D
Examples thereof include guanidines such as PG). Examples of the vulcanization accelerator include metal oxides represented by zinc oxide and fatty acids represented by stearic acid.

In order to obtain a rubber roll having high strength and excellent wear resistance, it is desirable to add carbon black. Specifically, the iodine adsorption amount is 23 to 142 mg / g, and the dibutyl terephthalate absorption amount (DBP) is 63 to 116 ml / 10.
Carbon black of 0 g can be mentioned. These carbon blacks are preferably blended in an amount of 30 to 100 parts by weight, particularly 50 to 80 parts by weight, based on 100 parts by weight of the diene rubber.

In addition to the above components, the rubber roll composition of the present invention may optionally contain a plasticizer, a softening agent, an antiaging agent, a tackifier, a filler, etc. within a range not impairing the gist of the present invention. May be added.

These compounds are made into a uniform mixture together with a diene rubber by using a device such as a Banbury mixer or a roll, and the mixture is dispensed with a calender roll to obtain a sheet-shaped unvulcanized rubber composition. Be done. This sheet usually has a thickness of about 1 to 6 mm.

The sheet-shaped unvulcanized rubber composition is wound around an iron core of a roller to a desired thickness or extruded into a mold, and then vulcanized by a vulcanizer to obtain a rubber roll. The rubber roll of the present invention thus obtained has excellent wear resistance and durability, and thus can be used as a lift roller, a rubber roll for an iron making roller, a rubber roll for papermaking, and the like.

[0018]

The present invention will be specifically described with reference to the following examples.

Examples 1 to 7 and Comparative Examples 1 to 5 Using the rubber roll compositions whose compositions are shown in Table 1, the physical properties of the vulcanized rubber were evaluated by the following methods. The results are shown in Table 2.

(1) Co-Rubber Adhesiveness A 3 mm thick unvulcanized rubber sheet, which was taken out with a roll, was stuck using a stitcher roll and vulcanized with steam at 148 ° C. for 60 minutes to give a co-rubber adhesive sample. Got The obtained sample was cut into a 25 mm wide zigzag shape, and peeled by an 180 ° peeling method using an autograph, and its peeling force and peeling state were observed. Material destruction was indicated by ◯ and interfacial peeling was indicated by x.

(2) Abrasion resistance (DIN abrasion) After kneading the composition, press vulcanization was carried out at 148 ° C. for 60 minutes to obtain a vulcanized rubber. About this, JIS K636
According to the abrasion test method for the cover rubber described in No. 9, the amount of abrasion (mm ³ ) after 40 rotations with a load of 1 kgf was measured.

(3) Small roll endurance test After kneading the composition, it was vulcanized and adhered to a roll iron core of φ150 mm × 200 mm using a commercially available cement, and φ
A 180 mm small roll sample was prepared. This is linear pressure 4
It was rotated at 0 kgf / cm and 250 rpm, and the time until the rubber roll was broken was measured.

(4) Initial Physical Properties Tensile Test After kneading the composition, press vulcanization was carried out at 148 ° C. for 60 minutes, and then a JIS No. 3 dumbbell-shaped test piece was obtained from this vulcanized rubber. Regarding this, JIS K6301.
Tensile test was carried out according to 3, and the tensile strength (T _B ),
It was calculated elongation (E _B) and tensile stress (M _100). Hardness Test After kneading the composition, press vulcanization was performed at 148 ° C. for 60 minutes to obtain a vulcanized rubber. About this, JIS K630
According 1.5 was measured A-type spring hardness of (H _S). Tear Test After mixing the composition, press vulcanization was performed at 148 ° C. for 60 minutes to obtain an A-shaped test piece from the vulcanized rubber. This was subjected to a tensile test according to JIS K6301.9 to calculate T _R A.

[0024]

[Table 1]

[0025]

[Table 2]

[0026]

[Table 3]

* 1 NIPOL 1507, manufactured by ZEON Corporation * 2 NIPOL BR 1220, ZEON Corporation
* 3 NIPOL 1042, manufactured by Nippon Zeon Co., Ltd. * 8 Sulfenamide-based vulcanization accelerator, manufactured by Ouchi Shinko Chemical Co., Ltd. * 9 Sulfenamide-based vulcanization accelerator, manufactured by Ouchi Shinko Chemical Co., Ltd. * 10 Aldehyde ammonium-based vulcanization accelerator, Ouchi Shinko Chemical Co., Ltd. * 11 Thiazole vulcanization accelerator, Ouchi Shinko Chemical Co., Ltd. * 12 Duralink HTS, Japan Monsanto Co., Ltd.

Table 2 ────────────────────────────────── Iodine adsorption DBP absorption (mg / g ) (ml / 100g) ────────────────────────────────── * 4 Carbon SAF (diamond black A) 140 116 * 5 Carbon HAF (SEAST 3) 80 101 * 6 Carbon GPF (SEAST V) 26 87 * 7 Carbon SRF (Asahi # 50) 23 63 ────────────────── ────────────────

[0029]

The rubber roll produced by the method of the present invention has excellent durability and wear resistance, and is suitable for use in lift rollers and iron-making rollers used under high load and high rotation.

[Brief description of drawings]

FIG. 1 is a diagram showing a part of a rubber roll manufacturing process.

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Claims (2)

[Claims] 1. A method for producing a rubber roll by vulcanizing a diene-based unvulcanized rubber composition containing a sulfur-based vulcanizing agent, wherein the diene-based rubber composition is hexamethylene-1,6.
-A method for producing a rubber roll, which comprises thiosulfate disodium salt. 2. The method for producing a rubber roll according to claim 1, wherein the diene-based unvulcanized rubber composition contains carbon black.