KR20110021251A - The composion of oil seal and oil seal thereof - Google Patents

Abstract

PURPOSE: An oil seal composition is provided to ensure a low friction property and to enable wide application to a composition of a rubber for slideway. CONSTITUTION: An oil seal rubber composition comprises: 100.0 parts by weight of nitrile rubber; 1.5~2.5 parts by weight of a mixture of a sulfur crosslinking agent with a peroxide crosslinking agent; 6~7 parts by weight of a crosslinking promoter of a mixture of N-cyclohexyl-2-benzothiazolylsulfenamide and tetramethylthiuram disulfide; 8~12 parts by weight of zinc oxide as a crosslinking accelerator aid; 20~30 parts by weight of filler; 3~8 parts by weight of polyetherester-based compound as a plasticizer; and 5~8 parts by weight of antiaging agent.

Description

The oil seal composition and the oil seal which consists of it {The Composion of Oil Seal and Oil Seal

The present invention relates to a drive system oil seal composition.

An oil seal refers to a machine element that seals oil, and oil is put in the friction part of the machine to facilitate the operation of the machine, but to prevent the oil from leaking from the gap of the machine, an oil seal is used. do.

 Initially, leather and natural rubber were used. However, since World War II, due to the development of synthetic rubber, it has been rapidly spread and spread due to its wide use and many advantages. Due to the development of the petrochemical industry, high awareness of environmental problems, and the improvement of the performance of machinery, new materials are being applied, and the development of dezanine is developing at a rapid pace, and the oil seal is gradually becoming lighter and longer life. A high level of technical skill is required to ensure that the quality level is the industrial level of the country.

In order to reduce the torque of the oil seal of the drive system, research has been mainly conducted to improve the cross-sectional shape to reduce the tightening force, that is, the stiffness of the rotating shaft. to be.

The main task of the low friction compounding design for the oil seal of the present invention is firstly to actively dissipate the frictional heat generated from the oil seal sliding surface, and secondly to directly reduce the sliding resistance by using the low friction compounding agent.

The present invention is a crosslinking agent which is a mixture of nitrile rubber, a sulfur crosslinking agent and a peroxide crosslinking agent, a crosslinking accelerator which is a mixture of N-cyclohexyl-2-benzothiazolyl sulfenamide and tetramethylthiuram disulfide, a crosslinking accelerator for zinc oxide, filler The present invention relates to an oil seal rubber composition comprising a plasticizer which is a polyether ester compound and an anti-aging agent.

The low friction rubber compounding composition of the present invention exhibits a low friction characteristic effect, and can be widely applied as a composition of rubber for sliding.

The present invention is a nitrile rubber 100 parts by weight, sulfur crosslinking agent and a peroxide crosslinking agent mixture of 1.5 to 2.5 parts by weight of crosslinking accelerator, a mixture of N-cyclohexyl-2-benzothiazolylsulfenamide and tetramethylthiuram disulfide 6 to 7 parts by weight The present invention relates to an oil seal rubber composition comprising 8 to 12 parts by weight of a crosslinking promoter of zinc oxide, 20 to 30 parts by weight of a filler, 3 to 8 parts by weight of a plasticizer of a polyether ester compound, and 5 to 8 parts by weight of an antioxidant.

The matrix rubber is nitrile rubber having excellent oil resistance and abrasion resistance, and the content ratio is 100 parts by weight based on the content of other compounding agents. Nitrile rubber is a copolymer of acrylonitrile and butadiene. In the present invention, used nitrile containing 31 to 35% by weight of acrylonitrile is used. In the crosslinking method, sulfur crosslinking combining sulfur and crosslinking accelerator and organic peroxide crosslinking are simultaneously applied. As a crosslinking agent used for peroxide crosslinking, a commercially available mixture composed of bis (tert-butyldioxyisopropyl) benzene, calcium carbonate and amorphous silica is used.

Sulfur, when used alone as a crosslinking agent, generally uses 0.3 to 5.0 parts by weight, and affects rubber properties such as heat resistance, low temperature, and permanent deformation depending on the amount used. In the present invention, by mixing and crosslinking the organic peroxide at the same time, it is possible to obtain a rubber physical property improved high strength characteristics, heat resistance, creep resistance.

The crosslinking accelerator is used by mixing two kinds of N-cyclohexyl-2-benzothiazolyl sulfenamide (CZ) and tetramethylthiuram disulfide (TT). If the accelerator is included in less than 1.3 parts by weight, the vulcanization time is too long to reduce productivity, and when the accelerator is added in excess of 2.0 parts by weight, a scorch may be generated and process defects may occur.

Crosslinking accelerators generally use zinc oxide, which is most commonly used.

Anti-aging agents include polymerized 2,2,4-trimethyl-1,2-dihydroquinoline (TMDQ) and special waxes that have good dispersibility and compatibility with rubber and have little effect on scorch and vulcanization properties. Sunlight crackers are used.

The filler uses acetylene black having excellent thermal conductivity, not general carbon black such as HAF or SRF. Acetylene black is produced by the self-exothermic decomposition of acetylene gas, and does not require oxygen in the reaction, so very little hydrogen content exists as undecomposed or functional groups with high purity, and contains little oxygen containing functional groups. It shows excellent thermal conductivity compared to general carbon black. In addition, graphite is blended to reduce the coefficient of friction, and talc is added to improve the friction characteristics.

In addition, flexibility is given to rubber using a polyester plasticizer.

The low friction rubber compounding composition of the present invention exhibits a low friction characteristic effect, and can be widely applied as a composition of rubber for sliding.

In addition, the present invention relates to an oil seal made of the oil seal rubber composition, an embodiment of the oil seal is shown in FIG.

The oil seal of the present invention according to the composition, it is possible to actively dissipate the frictional heat generated in the oil seal sliding surface as possible, it is possible to directly reduce the sliding resistance by using a low friction blending agent.

Hereinafter, preferred examples are provided to help understanding of the present invention, but the following examples are merely to illustrate the present invention, and the scope of the present invention is not limited to the following examples.

Example  One. Of oil seal  Produce

According to the composition of Table 1, except for the crosslinking agent and the crosslinking agent was mixed in an internal mixer to prepare a carbon master batch. The carbon master batch was placed in an open roll mixer to mix a crosslinking agent and an accelerator. The rubber compound thus prepared was prepared by a press mold and a standard test piece and an oil seal sample.

division ingredient Parts by weight Example 1 Comparative Example 1 Raw material rubber Nitrile Rubber (NBR) 100 100 Crosslinking agent sulfur 0.25 0.25 peroxide 1.9 1.9 accelerant TT 3 3 CZ 3.5 3.5 Filler HAF / SRF 70 Acetylene black 55 - Graphite 15 10 Talc 15 - Promotion ZnO 10 10 Anti-aging TMDQ 4 4 Wax 2 2 Plasticizer RS700 5 5 Processing aid Stearic acid One One NBR: Nitrile rubber, LG Chemical, B6240
Sulfur: Midas, SP400
Peroxides: Japanese gunpowder Akujo, parkadox 14-40
TT: Tetramethylthiuram disulfide, Oriental Chemical, oricel TT
CZ: N-cyclohexylbenzothiazole-2-sulfenamide, Oriental Chemical, oricel CZ
Carbon Black: Korea Carbon Black, Corax N330 (HAF) / N774 (SRF)
Acetylene black: Japan's electrochemical industry, denka black
Graphite: Korea Dongyang Carbon, IG-45
Talc: Japan Tark, D-1000
ZnO: Zinc Oxide, Hanil Zinc Oxide, 99.5%
TMDQ: polymerized 2,2,4-trimethyl-1,2 dihydroquinoline, Kumhomonsanto,
Rubatan 184-RD
Wax: Microcrystalline wax (Hydrocarbon 100%), Seiko chemical Disper
# 212: Fatty ester, yongjin emulsification
RS700: Plasticizer, Japan Adeka
Stearic Acid: Tantalum Industries, St-A

Comparative example  One. Of oil seal  Produce

In the same manner as in Example 1, a standard test piece and an oil seal sample were prepared according to the composition of Table 1.

Test Example  One. Rubber specimen  Property test

The physical properties of the rubber specimens prepared by the formulation of Example 1 and Comparative Example 2 were carried out under the following conditions, and the results are shown in Table 2.

Experimental Method

1. Hardness, tensile strength, heat resistance, compression set, oil resistance: conforms to KS M 6518

2. Low temperature: Complies with KS M 2921

Item Example 1 Comparative Example 1 Exam conditions Hardness (Hs) 73 76 - Tensile strength (kgf / cm ² ) 112 182 % Elongation 318 294 After aging
% Change Hardness +3 +4 100 ?, 70h The tensile strength -One +3 Elongation -22 -15 Compressive permanent strain (%) 15 12 Oil Resistance IRM901 Hardness +2 +4 The tensile strength +9 +6 Elongation -19 -4 volume -5.2 -6.7 Oil Resistance IRM903 Hardness -7 -4 The tensile strength -9 -9 Elongation -21 -6 volume +11.7 +8.1 Low temperature (TR10, ℃) -27 -26 -

Comparative Example 1 shows the properties of conventional oil seal rubber, and functional fillers such as talc are mixed as in the rubber formulation of Example 1, so that the tensile strength is small and the volume change rate is large in the oil deposition test. As a physical property, it is a level satisfied.

Test Example  2. Of oil seal  Property test

Table 3 shows the results of measuring the rotational torque by producing an oil seal with a rubber compound having the physical properties of Table 2. The test conditions are as follows.

<Test conditions>

1.axis rotation speed: 200 ~ 1000 rpm

2. Internal pressure: atmospheric pressure

3. Lubricant: Apply grease

4. Axial eccentricity and assembly eccentricity: each 0.05 mm T.I.R. Below

Shaft rotation speed
(rpm) Rotational torque (kg _f · cm) Comparative Example 1 Example 1 200 3.8 4.2 400 3.6 4.0 600 3.4 3.7 800 3.2 3.5 1000 3.0 3.4

As shown in Table 3, it shows a torque reduction effect of about 10% compared to the current comparative example. This result can reduce the friction loss of the automobile drive system.

1 is an embodiment of a drive system oil seal.

Claims (6)

100 parts by weight of nitrile rubber, 1.5 to 2.5 parts by weight of crosslinking agent which is a mixture of sulfur crosslinking agent and peroxide crosslinking agent, 6 to 7 parts by weight of crosslinking accelerator which is a mixture of N-cyclohexyl-2-benzothiazolylsulfenamide and tetramethylthiuram disulfide, oxidation An oil seal rubber composition comprising 8 to 12 parts by weight of a crosslinking promoter of zinc, 20 to 30 parts by weight of a filler, 3 to 8 parts by weight of a plasticizer which is a polyether ester compound, and 5 to 8 parts by weight of an antioxidant. The method of claim 1, The nitrile rubber is an oil seal rubber composition, characterized in that the acrylonitrile-butadiene copolymer. The method of claim 1, The peroxide crosslinking agent is an oil seal rubber composition, characterized in that a mixture of bis (tert-butyldioxyisopropyl) benzene, calcium carbonate and amorphous silica. The method of claim 1, The filler is an oil seal rubber composition, characterized in that the mixture of acetin black, graphite and talc. The method of claim 1, The anti-aging agent is an oil seal rubber composition, characterized in that the mixture of polymerization 2,2,4-trimethyl-1,2-dihydroquinoline and wax-based integrated crack inhibitor. Oil seal consisting of the oil seal rubber composition of any one of claims 1 to 5.

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