JPH09207274A - Wear resistant rubber composite material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the dispersion in the case of kneading with excellent wear resistance, to generate small heating quantity and to eliminate early vulcanization. SOLUTION: The wear resistant rubber composite material is obtained by kneading wear resistant rubber, high structure carbon black, vulcanizing agent, vulcanization assistant and plasticizer, and molding it in a desired shape. In this case, 10 to 30 pts.wt. of the mixing amount of the carbon black and 40 to 60 pts.wt. of the mixing amount of synthetic resin powder having excellent wear resistance are mixed to 100 pts.wt. of the wear resistant rubber. A lubricant hard coating film made of fluorine or silicone resin is provided on the surface exposed with the synthetic resin powder by surface polishing after the vulcanization.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wear resistant rubber composite which can be used for surface coating of rolls, belts, chutes, hoppers and the like.

[0002]

2. Description of the Related Art Generally, in order to improve the wear resistance of rubber, natural rubber, butadiene rubber, styrene-butadiene rubber, urethane rubber or the like having excellent wear resistance is selected as a raw material rubber, and a structure is used as a filler. The carbon black having a high reinforcing property is used, and the compounding amount thereof is set to 40 to 70 parts by weight with respect to 100 parts by weight of the rubber. However, when such a large amount of reinforcing carbon black is used, there is a problem that dispersion becomes difficult at the time of kneading, heat generation becomes large, and the rubber compound is vulcanized at an early stage. Was not enough.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a roll,
For surface coating of belts, chutes, hoppers, etc., it can be used by laminating it with other ordinary rubber or metal plate, fiber sheet, etc., and also has excellent abrasion resistance that can be used alone, and Disclosed is an abrasion-resistant rubber composite which is easy to disperse during kneading, has a small amount of heat generation, and is free from premature vulcanization.

[0004]

The invention of this application uses a rubber having excellent abrasion resistance such as natural rubber, butadiene rubber, styrene-butadiene rubber and urethane rubber as the rubber, and the amount of carbon black is usually In order to solve the above-mentioned problems, the synthetic resin powder having good wear resistance is added instead, and the surface is coated with a lubricating hard coating film. That is, the present invention is to knead natural rubber, butadiene rubber, styrene-butadiene rubber, urethane rubber and other abrasion resistant rubber, high structure carbon black, vulcanizing agent, vulcanization aid, plasticizer, etc. to obtain a desired shape. In the rubber composition molded into, the amount of the carbon black blended is 10 to 30 parts by weight, and the synthetic resin powder having excellent abrasion resistance is blended in an amount of 40 to 60 parts by weight with respect to 100 parts by weight of the wear resistant rubber. A lubricating hard coating film made of a fluororesin or a silicone resin is provided on the exposed surface of the synthetic resin powder by surface polishing after vulcanization.

The abrasion-resistant rubber of the present invention is a synthetic resin excellent in abrasion resistance, in which the compounding amount of carbon black having a high structure is reduced to 10 to 30 parts by weight as compared with the conventional 40 to 70 parts by weight. Since 40 to 60 parts by weight of powder is blended, the above rubber, carbon black, synthetic resin powder, vulcanizing agent, vulcanizing aid, plasticizer and the like are intermixed,
When kneaded with a Banbury mixer or rolls, it is uniformly and easily dispersed, so that the calorific value is small and premature vulcanization does not occur. And, since the lubricating hard coating film is provided on the surface where the above synthetic resin powder is exposed by the surface polishing after being molded into a desired shape and vulcanized, the sliding is good and the vulcanized rubber is worn. The amount is significantly smaller than before, and even if the lubricious hard coating wears due to use,
The abrasion resistant synthetic resin powder in the rubber is gradually exposed on the surface,
Since this synthetic resin powder is in contact with other machine parts, the slidability is maintained well and the progress of wear is suppressed.

However, if the amount of the carbon black compounded is less than 10 parts by weight, the desired physical properties cannot be obtained, and if it exceeds 30 parts by weight, the workability during kneading deteriorates. Further, if the blending amount of the above synthetic resin powder is less than 40 parts by weight, abrasion resistance is insufficient, and conversely, if it exceeds 60 parts by weight, workability during kneading decreases. Further, when the thickness of the lubricious hard coating film is less than 3 μm, the effect of coating is not obtained, and
If it exceeds μm, the workability of coating is deteriorated.

The high-structure carbon blacks include HAF carbon, SAF carbon, and I
Examples include SAF carbon, but high structure SAF and high structure ISAF are particularly preferable.
Further, as the above synthetic resin powder having excellent wear resistance,
Nylon, fluororesin, polyacetal and polyethylene are exemplified, but ultra high molecular weight polyethylene and fluororesin are particularly preferable. And the particle size is 100
˜200 μm is preferable, and if the particle size is less than 100 μm, the abrasion resistance becomes insufficient, while if it exceeds 200 μm, mechanical properties such as tensile strength and tear strength deteriorate. In addition, the lubricious hard coating film is a fluorine-based lubricant (for example, manufactured by Chem Trend Co.
272A ”) and a silicone-based lubricant (for example, Shin-Etsu Silicone, trade names“ KM753 ”,“ KF96 ”).
1 ") and the like are preferably applied by spraying and dried.
The molybdenum disulfide-based lubricant is not preferable because molybdenum disulfide adheres to the treated surface and stains are transferred.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 100 parts by weight of natural rubber, 10 to 30 parts by weight of high-structure SAF carbon black, and 100 to 2 particle diameters.
40-60 parts by weight of ultra-high molecular weight polyethylene powder of 00 μm, other appropriate amounts of sulfur, vulcanization aid, plasticizer, etc. were blended in a conventional manner, and after kneading, a square plate was formed, A vulcanized rubber plate of the same size, with bolt holes at the four corners, is placed on an iron plate with adhesive applied to the surface, adhered to the iron plate by vulcanization, the surface is ground, and then a fluorinated lubricant is applied. It is applied by spraying and dried to form a lubricious hard coating film having a thickness of 3 to 8 μm. The obtained laminated plate is bolted to the inner surface of a hopper for transporting quarry, gravel, ore, etc., chute, truck carrier, etc., and used as a liner for the hopper, etc.

Embodiment 2 100 parts by weight of urethane rubber and HA of high structure
10 to 30 parts by weight of F carbon black, particle size 100
˜200 μm ultra high molecular weight polyethylene powder 40-6
0 parts by weight, other sulfur, vulcanization aid, plasticizer, etc. were blended in appropriate amounts according to a conventional method, and after kneading, the resulting unvulcanized rubber had an inner diameter slightly larger than the iron core diameter of the blast machine guide roller. The inner cylinder is molded, and the surface of the inner cylinder is wrapped with a woven fabric to form a reinforcing layer, and the outer cylinder made of the above unvulcanized rubber is further adhered to the inner cylinder, the reinforcing layer and the outer cylinder. Are integrated by vulcanization adhesion. After a while
Each surface of the outer cylinder and the inner cylinder is polished to expose the ultra-high molecular weight polyethylene powder, and a silicone-based lubricant is sprayed on it, and dried to form a lubricious hard coating film with a thickness of 3 to 8 μm. To do. The obtained rubber cylinder having a laminated structure is rotatably fitted on an iron core to form a guide roller for a blast machine.

[0010]

EXAMPLES The rubbers of Sample 1 and Sample 2 were compounded in the composition (parts by weight) shown in Table 1 below.

Table 1 Sample 1 Sample 2 Styrene butadiene rubber 100 100 Zinc white 2 2 Stearic acid 1 1 SAF carbon black 20 60 Process oil 10 10 Sulfur 2 2 TMTD 0.2 0.2 CBS 0.8 Over 0.8 High molecular weight polyethylene powder 600

The above mixture was kneaded with a mixing roll to form a sheet having a thickness of about 2 mm, which was vulcanized with a press at a temperature of 150 ° C. and a pressure of 15 kg / cm ² for 10 minutes to give a vulcanized product having a thickness of 2 mm. A vulcanized rubber sheet was obtained. A disk with a diameter of 120 mm was cut from these rubber sheets to make a test piece, and JIS
A wear test was performed by the Taber wear test method of K6264. However, the load during the test was set to 1000 gf, the rotary table on which the sample was placed was rotated 1000 times,
-22 was used. The results are shown in Table 2 below. The surface of the sample 1 was polished and the ultra high molecular weight polyethylene powder was exposed was designated as sample 3, and the surface of the sample 2 was polished as sample 4.

Table 2 Sample 1 Sample 2 Sample 3 Sample 4 Abrasion amount (mmg) 72 112 39 105

Further, the surface of the sample 1 was polished to expose the ultra high molecular weight polyethylene powder, and the sample 2 was not polished, but the fluorine-based lubricant (manufactured by Chem Trend, Inc., trade name: Monocoat E272A ") was applied and dried to form a lubricative hard coating film having a thickness of 6 μm, which was referred to as Sample 5 and Sample 6. Further, a lubricative hard coating film was prepared in exactly the same manner as in Samples 5 and 6, except that the fluorine-based lubricant in Samples 5 and 6 was changed to a silicone-based lubricant (trade name "KM753" manufactured by Shin-Etsu Silicone Co., Ltd.). It formed and it was set as the sample 7 and the sample 8. For each of these samples 5 to 8, a wear test was conducted at a table rotation speed of 1000 times in the same manner as above.
I went there. The results are shown in Table 3 below.

Table 3 Sample 5 Sample 6 Sample 7 Sample 8 Amount of wear (mmg) 21 94 33 103

As can be seen from the above experimental results, the samples 5 and 7 corresponding to the examples of the present invention have a very small amount of wear. Then, Sample 3, which corresponds to Samples 5 and 7 with the lubricious hard coating film peeled off, has the smallest amount of wear next to Samples 5 and 7. On the other hand, the amount of wear increases in Sample 1 in which only ultra-high molecular weight polyethylene powder is blended. In addition, Sample 2, Sample 4, Sample 6, and Sample 8 in which the above-mentioned compounding is omitted are Sample 2 and Sample 4 which do not have a lubricious hard coating film.
The wear amount of Samples 6 and 8 provided was significantly large.

[0017]

According to the invention of claim 1, wear-resistant rubber,
In a rubber composition obtained by kneading a high-structure carbon black, a vulcanizing agent, a vulcanization aid, a plasticizer, etc. and molding the mixture into a desired shape, the amount of the carbon black blended is 100 parts by weight based on 100 parts by weight of the abrasion resistant rubber. -30 parts by weight, 40 to 60 parts by weight of a synthetic resin powder having excellent wear resistance is compounded, and the surface of the synthetic resin powder exposed by vulcanization after vulcanization is exposed to a fluorine resin or a silicone resin. Since the lubricating hard coating film made of resin is provided, the carbon black is uniformly and easily dispersed during the kneading, so that early vulcanization does not occur. Moreover, when the use is started, since the hard lubricating film is present on the surface, the wear is remarkably reduced. Even if the lubricious hard coating film is peeled off, the abrasion-resistant synthetic resin powder in the rubber is exposed on the surface, so that the progress of abrasion is suppressed.

According to a second aspect of the present invention, the synthetic resin powder in the abrasion resistant rubber composite according to the first aspect is made of nylon,
Since it is limited to fluororesin, polyacetal, or polyethylene, and its particle size is limited to 100 to 200 μm, wear is further reduced.

According to a third aspect of the present invention, in the abrasion-resistant rubber composite according to the first or second aspect, the thickness of the lubricative hard coating film is limited to 3 to 8 μm. Good workability in forming a hard coating and durability of the coating.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location // C08L 23/04 LCB C08L 23/04 LCB 77/00 LQR 77/00 LQR C09D 127/12 PFG C09D 127/12 PFG

Claims (3)

[Claims] 1. An abrasion resistant rubber, a carbon black having a high structure, a vulcanizing agent, a vulcanization aid, a plasticizer and the like are kneaded,
In a rubber composition molded into a desired shape, the amount of the carbon black compounded is 10 to 30 parts by weight, and the synthetic resin powder having excellent abrasion resistance is compounded in an amount of 40 to 60 parts by weight, based on 100 parts by weight of the abrasion resistant rubber. A wear-resistant rubber characterized in that a lubricative hard coating film made of a fluorine-based resin or a silicone-based resin is provided on the surface where the above-mentioned synthetic resin powder is exposed by surface polishing after vulcanization. Complex. 2. The abrasion resistant rubber composite according to claim 1, wherein the synthetic resin powder is made of nylon, fluororesin, polyacetal or polyethylene, and has a particle size of 10
A wear resistant rubber composite having a thickness of 0 to 200 μm. 3. The abrasion-resistant rubber composite according to claim 1, wherein the lubricious hard coating film has a thickness of 3 to 8 μm.