JP2002213433A - Acidproof-abrasion resistant rubber roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an iron manufacturing acidproof-abrasion resistant rubber roller having little shape changes such as abrasion, even in hydrochloric acid environment, and capable of obtaining long service life, even if the roller constitution and the mechanical constitution are not devised by having a flexible surface layer of superior liquid draining performance. SOLUTION: This iron manufacturing acidproof-abrasion resistant rubber roller has a core metal 1, and the surface layer 2 arranged on the peripheral surface of this core metal 1, and has the surface layer 2 is composed of an ethylene-propylene copolymer having a 100% modulus of not less than 9 MPa, and hardness of not more than 90 deg. as measured by a JIS A hardness meter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acid-resistant and abrasion-resistant rubber roll for steel making used in an acid atmosphere.

[0002]

2. Description of the Related Art Among the rubber rolls, the following technologies have been disclosed with respect to ringer rolls for steelmaking, which are used under severe conditions and are treated as short-lived products.

Prior art 1 (Japanese Patent Laid-Open No. 3-285100):
The present invention comprises a pair of rolls, and in a ringer roll that sandwiches a strip from both surfaces and drains these surfaces, of the pair of rolls, at least one of the rolls has a surface that is higher than the surface of the other roll. Hard, preferably, the pair of rolls is provided with a coating such as a resin on the surface of the core material, the coating of one roll is harder than the other of the other roll, more preferably, the hard The surface Young's modulus of the roll is 10 to 4000 kgf / m.
The main point is that m ² is set to 98.0665 to 39226.6 MPa. If both rolls are constituted by coating the surface of a core material with a resin or the like, and the coating of one roll is made harder than the coating of the other roll, the production of the roll is easy, and various diameters are obtained. It is also possible to apply to the roll of. Further, the Young's modulus on the surface of the hard roll is 10 to 4000 kgf / mm ² (98.
0665 to 39226.6 MPa), the improvement in the liquid drawability and the roll life becomes remarkable.

Prior art 2 (Japanese Patent Application Laid-Open No. H10-112279) This invention relates to a ringer roll for removing a liquid attached to both surfaces of a metal strip to be transported.
Laminate an inner layer made of a flexible material on the surface of the metal core material,
The inner layer on than flexible material formed by laminating an outer layer made of a non-metallic material having a variable Jie of hard, preferably the inner layer is 1kgf / mm ² (9.80665MPa) The following flexible materials 5~50mm The outer layer is 10 to 500 kgf / mm ² (98.665 to 4
Non-metallic material having a flexibility of 903.25 MPa) is 1
The gist is that the inner layer is made of rubber or urethane, and the outer layer is made of a polymer material. Since the inner layer made of a flexible material is provided on the surface of the metal core material, the outer layer made of a hard and flexible non-metallic material follows the inner layer and bends, and the metal strip is bent in the width direction and the longitudinal direction. Even when the roll has unevenness in the direction, the roll is in close contact with the metal strip and no gap is formed, so that the liquid drainage property is excellent. In addition, the outer layer made of a hard nonmetallic material has less wear due to contact with a metal strip, and the roll profile does not change for a long time, so that the roll life is long.

[0005] The above two techniques extend the life of the roll by using a hard material on the roll surface, and improve the liquid drainage performance that is reduced by softening the mating roll or the inside of the hard surface. That is,
By using a hard material as the surface material, a change in the shape of the roll surface due to abrasion or the like is reduced, and the liquid draining performance, which is reduced thereby, is improved by devising a mechanical configuration or a roll configuration.

On the other hand, the following technique has been disclosed as a technique for improving the life of a roll while maintaining the liquid removal performance by using only the roll surface material. Prior art 3 (Japanese Unexamined Patent Application Publication No.
1997725) A crosslinked rubber composition having excellent tensile strength and elongation obtained by blending zinc oxide and methallylic acid in an appropriate range with an ethylene / propylene copolymer, and this crosslinked rubber composition And a rubber roll using the same. The example shows that when the above rubber roll was used for a ringer roll, the life was extended from one month to three months instead of one month. However, compared to the hard surface materials in the prior arts 1 and 2 only by improving the tensile strength and elongation, the shape change due to wear and the like is still large, and further improvement is desired. Further, in the prior art 3, there is also a problem that the high mechanical properties cannot be maintained in the hydrochloric acid environment, and the shape change becomes large with the elapse of time and the life is shortened.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made in view of such circumstances, and has a soft surface layer which has little change in shape such as abrasion even in a hydrochloric acid environment and has excellent liquid drainage. Another object of the present invention is to provide an acid-resistant and abrasion-resistant rubber roll for steelmaking that can provide a long life without devising a roll configuration or a mechanical configuration.

[0008]

The present invention comprises a metal core and a surface layer provided on a peripheral surface of the metal core, wherein the surface layer has a 100% modulus of 9 MPa or more and JIS.
Acid resistance for iron making, characterized by being composed of an ethylene / propylene copolymer having a hardness of 90 ° or less in A hardness tester,
It is a wear-resistant rubber roll.

In general, when an ethylene / propylene copolymer is used as a surface layer material, the change in characteristics in various environments is small, but the mechanical characteristics are poor, so the shape changes due to abrasion and the like are large and the life is not extended. However, as a result of diligent research, the present applicant has found that using an ethylene / propylene copolymer having a 100% modulus of 9 MPa or more and a hardness of 90 ° or less according to a JIS A hardness tester results in poor liquid drawability. It has been found that a long-lasting ringer roll for steelmaking with little change in shape due to wear or the like can be obtained without damage.

In the present invention, 100% modulus (M
The reason for setting 100) to 9 MPa or more is that the abrasion of the rubber roll transporting a plate such as a metal strip is correlated with the 100% modulus, and the larger the 100% modulus, the better the abrasion resistance. FIG.
The correlation diagram of 100 and a roll life is shown.

The reason why the hardness according to the JIS A hardness tester is set to 90 ° or less in the present invention is that if the hardness is higher than this, gaps are formed when the steel plate has irregularities and the liquid drainage property is reduced. It will be worse.

In the present invention, the ethylene / propylene-based copolymer refers to a terpolymer rubber (hereinafter referred to as EPDM) comprising ethylene / propylene and a non-conjugated diene. As the non-conjugated diene, dicyclopentadiene, methyltetrahydroindene, methylene norbornene, ethylidene norbornene, 1,4-hexadiene and the like are generally used, and those obtained by copolymerizing ethylidene norbornene are particularly suitable.

As the reinforcing filler, it is preferable to add 40 to 70 parts by weight of reinforcing carbon black. Various rubber reinforcing agents such as carbon black, white carbon, and hard clay were examined, and carbon black showed the least change in shape due to wear and the like. In particular, furnace-based carbon black having a specific surface area of more than 80 to 120 m ² / cm ³ is preferable. Examples of such carbon black include trade names: Seast 3, Seast 6, and Seast 9 manufactured by Tokai Carbon Co., Ltd. Reinforcing carbon black is 100% if less than 40 parts by weight
It is difficult to make the modulus 9 MPa or more, and the shape change due to abrasion or the like is undesirably large. Further, the characteristic change in a hydrochloric acid environment also becomes large. On the other hand, if the carbon black exceeds 70 parts by weight, the processability is reduced, and it is difficult to laminate the carbon black on the peripheral surface of the cored bar.

In the present invention, zinc oxide and methacrylic acid are mixed in a total amount of 10 parts by weight or more and less than 20 parts by weight with respect to 100 parts by weight of the raw rubber, and the ratio of both is 1: 2 to 2: It is preferably set to 1. The compounding amounts of zinc oxide and methacrylic acid and the mixing ratio of both increase the strength of the rubber and improve the abrasion resistance, but also increase the property deterioration in a hydrochloric acid environment. If the total amount is 20 to 40 parts by weight as in the prior art 3 previously filed by the present applicant, it is not preferable because the deterioration in properties in a hydrochloric acid environment becomes larger than the increase in strength. It is preferable that the amount is 10 parts by weight or more and less than 20 parts by weight that improves the strength of the rubber even in a hydrochloric acid environment.

As the vulcanizing agent for EPDM, a sulfur-based vulcanizing agent or an organic peroxide is used. In the present invention, either vulcanizing agent may be used. In addition, a general rubber compounding agent such as an antioxidant, a vulcanization aid, a processing aid, a filler other than furnace carbon black, a plasticizer, and the like can be added.

A rubber roll having a sufficient liquid drainage property by using only the surface material and having a small shape change and a long life even in a hydrochloric acid environment could not be obtained from the prior art. However, as described above, the combination of various compounding agents has a hardness of 90 MPa or less and a hardness of 9 MPa or more despite the hardness of 90 ° or less.
By providing a surface layer material using EPDM having a 00% modulus as a raw rubber, a rubber roll having a small shape change and a long life was invented.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described together with comparative examples. In the examples and comparative examples, parts and percentages are indicated on a weight basis unless otherwise specified.

(Examples 1 to 3 and Comparative Examples 1 and 2) First, a compounded rubber containing EPDM as a main raw material according to the compounding formulation shown in Table 1 below (all compounding amounts are shown in parts by weight). The composition was prepared. Subsequently, press vulcanization was performed at 150 ° C. for 90 minutes to obtain a vulcanized sheet having a thickness of 2 mm. The vulcanized sheet is used to make 1 according to JIS K6251.
The 00% modulus, tensile strength and elongation were measured. Also,
After this vulcanized sheet was immersed in a 10% by weight hydrochloric acid solution at 90 ° C. for one week, the same measurement was performed to measure the change in properties in a hydrochloric acid environment. Next, the above rubber composition was subjected to a core diameter φ80 mm.
After coating on a core metal having a surface length of 20 mm and performing steam vulcanization at 160 ° C., the outer diameter was polished to φ100 mm to prepare a roll. The steel sheet was transported 1000 km by the roll, and the shape change of the surface material was measured. The results shown in Table 1 were obtained by the above method.

[0019]

[Table 1]

Immersion test conditions: 10% by weight HC1 solution 9
0 ° C for 1 week Wear test: Roll shape φ80 × φ100 × L20 10
Outer diameter change amount at the time of passing through 00 km From Examples 1, 2, and 3, 100% modulus is 9 MPa
With the above surface material, the result that the shape change of the surface material was small was obtained. Further, from Examples 1 and 2, by setting methacrylic acid + zinc oxide to 10 parts by weight or more and less than 20 parts by weight and setting carbon black in the range of 40 to 70 parts by weight, not only shape change but also hydrochloric acid environment A lower surface material was obtained with less characteristic deterioration.
On the other hand, in the case of Comparative Example 1, the hardness is 90 degrees or less and the liquid drawability is good, but the 100% modulus does not reach 9 MPa,
Poor wear resistance (mm / 1000km). Further, in the case of Comparative Example 2, a 100% modulus of 9 MPa or more can be achieved, but the hardness is high and the liquid drawability is impaired.

FIG. 1 shows an acid-resistant and abrasion-resistant rubber roll for steel making according to the present invention, which comprises a metal core 1 and a surface layer 2 provided on a peripheral surface of the metal core 1. For this reason, in the acid- and abrasion-resistant rubber roll for iron making according to the present invention, the 100% modulus of the surface layer 2 is 9M.
It is important that the pressure is equal to or higher than Pa. In a hydrochloric acid environment, in particular, for the surface layer 2, 100 parts by weight of the raw rubber,
A mixture of zinc oxide and methacrylic acid having a mixing weight ratio of 1: 2 to 2: 1 in a total weight of 10 to 20 parts by weight and a reinforcing furnace-based carbon black of 40 to 70 parts by weight is used. is important.

Next, examples and comparative examples in an actual iron making line will be described.

First, an iron core (core metal) is blasted in the same manner as in ordinary roll forming, and then an adhesive is applied to the iron core. Then, the unvulcanized rubber sheet according to Example 1 and Comparative Example 1 is used. Was roll-formed, vulcanized and polished to obtain two types of rubber rolls for steelmaking (the rubber roll of the present invention and the rubber roll of the comparative example). Tests were performed on these rubber rolls as ringer rolls in a pickling line for iron making, which squeezes a chemical solution attached to a steel plate, and as a result, it was confirmed that the rubber roll of the present invention had twice or more the durability as compared with the rubber roll of the comparative example. did it. In addition, the dimension of the ringer roll of the pickling processing line for iron making is diameter 290mm x length 2400mm, and the use conditions are as follows.

Chemical solution (hydrochloric acid concentration) 10% Temperature 90 ° C. Speed 320 m / min Linear pressure 40 kgf / cm This line has a higher concentration of chemical solution and higher operating temperature than a normal pickling treatment line. The re-polishing cycle was as short as about one month. In fact, when the durability (re-polishing cycle) of the rubber roll of the present invention and the comparative rubber roll was examined, it was 2 months for the rubber roll of the present invention and 1 month for the rubber roll of the comparative example.
In other words, by using the roll of the present invention, the initial repolishing cycle was dramatically increased to two months, and the polishing cycle did not change even after long-term use in a hydrochloric acid environment.

[0025]

According to the present invention, the surface layer of the core metal has a 100% modulus of 9 MPa or more and JIS.
An acid-resistant and abrasion-resistant rubber roll for steel making that has a long life with little change in shape due to abrasion to thin steel, etc. by using a composition composed of an ethylene-propylene copolymer having a hardness of 90 ° or less as measured by an A hardness tester. Can be provided.

In particular, the surface layer is made up of zinc oxide and methacrylic acid in a mixing weight ratio of 1: 2 to 2: 1 with respect to 100 parts by weight of the raw rubber, so that the total weight is from 10 to less than 20 parts by weight, and Furnace carbon black of 40-70
When the composition is composed of an ethylene / propylene copolymer mixed in parts by weight, it is possible to provide an acid-resistant and abrasion-resistant rubber roll for steelmaking having a long life even in a hydrochloric acid environment.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an acid-resistant and wear-resistant rubber roll for iron making.

FIG. 2 shows a correlation diagram between M100 and roll life.

[Explanation of symbols]

 1 ... core metal, 2 ... surface layer.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigenobu Takada 1-chome, Mizushima-Kawasaki-dori, Kurashiki-shi, Okayama Pref. Chome (without address) Inside the Mizushima Works, Kawasaki Steel Corporation (72) Inventor Yasuhiko Mitani 1-324 Osaki, Shinagawa-ku, Tokyo In-house Kaneyo Co., Ltd. No. 3-24 F-term (reference) for Kaneyo Co., Ltd. 3J103 AA02 AA12 AA23 FA11 FA12 FA13 GA02 GA15 GA52 HA12 HA41 HA53 4J002 BB151 DA038 DE106 EF047 GM00

Claims (2)

[Claims] 1. A core comprising: a metal core; and a surface layer provided on a peripheral surface of the metal core, wherein the surface layer has a 100% modulus of 9%.
MPa or higher and hardness of 90 ° according to JIS A hardness tester
An acid- and abrasion-resistant rubber roll for iron making, comprising the following ethylene-propylene copolymer. 2. The surface layer is reinforced with zinc oxide and methacrylic acid having a mixing weight ratio of 1: 2 to 2: 1 with respect to 100 parts by weight of raw rubber to a total weight of 10 to less than 20 parts by weight. Furnace carbon black of 40-70
The acid- and abrasion-resistant rubber roll for iron making according to claim 1, wherein the rubber roll is blended in parts by weight.