CN102604178A - Wear-resistant modified HNBR (hydrogenated nitrile butadiene rubber), NBR (nitrile butadiene rubber) and NBR/PVC (polyvinyl chloride) dynamic sealing material adopting molybdenum disulfide solid lubricant and preparation method for same - Google Patents

Abstract

The invention relates to a wear-resistant modified HNBR (hydrogenated nitrile butadiene rubber), NBR (nitrile butadiene rubber) and NBR/PVC (polyvinyl chloride) dynamic sealing material adopting molybdenum disulfide solid lubricant. Components of the dynamic sealing material comprise rubber matrix materials, the molybdenum disulfide solid lubricant, zinc oxide, stearic acid, anti-ageing agent, accelerator, vulcanizing agent and plasticizer. The wear-resistant modified HNBR, NBR and NBR/PVC dynamic sealing material is prepared by plastication, mixing and vulcanization molding. On the premise of maintaining original advantages of base materials such as oil resistance, corrosion resistance, weather proofing and ageing resistance, a dynamic seal ring for a high-speed running mechanical part and prepared by the three materials has more excellent friction reduction and abrasion resistance, and a certain reinforced modified effect is achieved.

Description

HNBR, NBR, NBR/PVC dynamic sealing material modified by molybdenum disulfide solid lubricant and preparation method thereof

technical field

The invention relates to a rubber dynamic sealing material, in particular to a HNBR, NBR, NBR/PVC dynamic sealing material using a molybdenum disulfide solid lubricant wear-resistant modifier.

Background technique

At present, nitrile rubber is the most widely used elastomer in sealing materials, which is mainly due to its excellent oil resistance and wide service temperature range (-55 ° C ~ +125 ° C). Nitrile rubber NBR is a copolymer of butadiene and acrylonitrile, changing the composition of the copolymer can obtain sealing materials under different conditions of use. Nitrile rubber is mainly produced by low-temperature emulsion polymerization. It has excellent oil resistance, high wear resistance, good heat resistance and strong adhesion. Its disadvantages are poor low temperature resistance, poor ozone resistance, poor electrical properties, and slightly lower elasticity. It is mainly used to make oil-resistant products, such as oil-resistant pipes, tapes, rubber diaphragms and large oil bags, etc. It is often used to make various oil-resistant molded products, such as O-rings, oil seals, leather cups, diaphragms, valves, bellows, etc. Used to make rubber sheets and wear-resistant parts.

The polarity of nitrile rubber is very strong, and the compatibility with other polymers is generally not very good, but it is compatible with neoprene rubber, modified phenolic resin, polyvinyl chloride and other highly polar polymers, especially with chlorine-containing Polymers have good compatibility, and nitrile rubber polyvinyl chloride NBR/PVC is usually used. In addition, in order to improve processability and performance, nitrile rubber is often used in combination with non-polar rubber such as natural rubber, styrene-butadiene rubber, and butadiene rubber. It should be pointed out that nitrile rubber is characterized by good oil resistance, and when used in combination with other polymers (except polyvinyl chloride), there is a tendency to reduce oil resistance. the

Hydrogenated nitrile rubber HNBR is obtained by selective hydrogenation of butadiene units in NBR. Because the unsaturated double bonds on the olefin chain are hydrogenated and saturated, it is also called highly saturated nitrile rubber HSN. The molecular structure of HNBR makes it have good heat resistance and aging resistance, resistance to automotive oils containing corrosive additives, low temperature resistance, and physical and mechanical properties comparable to normal temperature at high temperatures. quality.

Under the conditions of high temperature and the presence of oil and lubricant, it is used for the dynamic sealing ring of the fast-rotating part of the machine. The nitrile rubber has a certain wear resistance when it rubs against the metal. However, with the advancement of modern technology, the performance requirements for seals are becoming increasingly stringent. In order to improve the service life of the seal, in addition to considering the necessary mechanical properties, elasticity and oil resistance of the sealing material, it is also necessary to reduce the sliding friction coefficient and wear rate when the rubber material rubs against the smooth surface, so as to maximize the material's durability. Anti-friction and anti-wear properties, and these are the problems to be solved by the present invention.

Contents of the invention

One of the purposes of the patent of the present invention is to provide a solid lubricant using molybdenum disulfide with excellent anti-friction and anti-wear properties under the premise of ensuring the inherent advantages of the rubber system in oil resistance, corrosion resistance, weather resistance, and aging resistance. Wear-resistant modified HNBR, NBR, NBR/PVC dynamic sealing materials.

The second object of the present invention is to provide a preparation method of the sealing material.

To achieve the above object, the present invention adopts technical scheme as follows:

A kind of HNBR, NBR, NBR/PVC dynamic sealing material modified by molybdenum disulfide solid lubricant, characterized in that the components of the dynamic sealing material and the mass percentage of each component are:

Rubber base material 100 parts;

Molybdenum disulfide solid lubricant 0.5 to 20 parts;

Zinc oxide 1 to 10 parts;

Enhanced carbon black, 5-150 parts;

Stearic acid, 0.1 to 5 parts;

Vulcanizing agent 0.5 to 10 parts;

Anti-aging agent, 0.1 to 5 parts;

Accelerator, 0.5 to 10 parts;

Plasticizer, 1 to 20 parts;

The rubber matrix material is: hydrogenated nitrile rubber HNBR, nitrile rubber NBR or nitrile rubber and polyvinyl chloride blend material NBR/PVC.

The above-mentioned solid lubricant is molybdenum disulfide powder with a particle size of 0.1 μm to 10 μm; the vulcanizing agent is 2,5-dimethyl-2,5 (di-tert-butylperoxy) hexane, diisoperoxide Propylbenzene or sulfur; the anti-aging agent is a mixture of 2-mercaptobenzimidazole and N-phenyl-2-naphthylamine (D); the accelerator is triallyl isocyanurate; Described plasticizer is dioctyl phthalate.

The hydrogenated nitrile rubber has a residual double bond rate of 0.5 to 6%.

A method for preparing the above-mentioned HNBR, NBR, NBR/PVC dynamic sealing material modified by molybdenum disulfide solid lubricant, characterized in that the specific steps of the method are as follows: each component is heated at 40-60°C Mix at the temperature of the roller until it is evenly mixed, and the prepared mixed rubber is parked for 16-20 hours; the above-mentioned mixed rubber is re-milled and thinned out, and the mixed rubber is vulcanized and molded. The vulcanization time is 0.5-1.5 hours and the vulcanization temperature is 150～180℃, vulcanization pressure is 10～15MPa.

The dynamic sealing material of the present invention has more excellent anti-friction and anti-wear properties while maintaining the original advantages of the base material, such as oil resistance, corrosion resistance, weather resistance, and aging resistance, and has a certain enhancement and modification effect.

Detailed ways

Example 1. In this embodiment, 100 parts by mass of nitrile rubber (brand name: NBR-26), 8 parts by mass of molybdenum disulfide MoS ₂ , 2 parts by mass of zinc oxide, 60 parts by mass of carbon black, and 0.3 parts by mass of stearic acid are used. 4 parts by mass of 2,5-dimethyl-2,5 (di-tert-butylperoxy) hexane (DBPH), 2 parts by mass of 2-mercaptobenzimidazole (MBI), 1 part by mass of N-phenyl-2 - Naphthylamine (D), 6 parts by mass of triallyl isocyanurate (TAIC), 10 parts by mass of dioctyl phthalate (DOP). Using low-temperature mixing, first add 100 parts by mass of the base rubber compound, then sequentially add molybdenum disulfide, zinc oxide, carbon black, stearic acid, anti-aging agent, accelerator, vulcanizing agent, plasticizer, mixing roller temperature 40-60°C, the prepared mixed rubber is parked for 16-20 hours; before vulcanization, the above-mentioned mixed rubber is re-milled and thinned out, and the mixed rubber is vulcanized and molded. The vulcanization time is 0.5-1.5 hours and the vulcanization temperature is 150- 180°C, vulcanization pressure is 10-15MPa.

Example 2, this implementation method uses 100 parts by mass of nitrile rubber polyvinyl chloride blend (brand: NBR-26/PVC-32), 10 parts by mass of molybdenum disulfide MoS ₂ , 2 parts by mass of zinc oxide, 80 parts by mass Carbon black, 0.2 parts by mass of stearic acid, 6 parts by mass of 2,5-dimethyl-2,5 (di-tert-butylperoxy) hexane (DBPH), 1 part by mass of 2-mercaptobenzimidazole (MBI) , 1 part by mass of N-phenyl-2-naphthylamine (D), 4 parts by mass of triallyl isocyanurate (TAIC), and 5 parts by mass of dioctyl phthalate (DOP). Others are the same as in the first embodiment.

Example 3, this implementation method uses 100 parts by mass of hydrogenated nitrile rubber (brand name: Zetpol2010L), 5 parts by mass of molybdenum disulfide MoS ₂ , 3 parts by mass of zinc oxide, 50 parts by mass of carbon black, 0.5 parts by mass of stearic acid, 5 parts by mass of Parts by mass of 2,5-dimethyl-2,5(di-tert-butylperoxy)hexane (DBPH), 1 part by mass of 2-mercaptobenzimidazole (MBI), 1 part by mass of N-phenyl-2- Naphthylamine (D), 5 parts by mass of triallyl isocyanurate (TAIC), and 5 parts by mass of dioctyl phthalate (DOP). Others are the same as in the first embodiment.

Example 4, this embodiment uses 100 parts by mass of hydrogenated nitrile rubber (brand: Zetpol2010L), 5 parts by mass of molybdenum disulfide MoS ₂ , 3 parts by mass of zinc oxide, 50 parts by mass of carbon black, 0.5 parts by mass of stearic acid, 5 parts by mass Parts by mass of sulfur, 1 part by mass of 2-mercaptobenzimidazole (MBI), 1 part by mass of N-phenyl-2-naphthylamine (D), 5 parts by mass of triallyl isocyanurate (TAIC), 5 parts by mass of dioctyl phthalate (DOP). Others are the same as in the first embodiment.

The above four ingredients were mixed, vulcanized and molded, and then comprehensively tested for mechanical properties and dynamic friction and wear properties. The results are listed in Table 1 and Table 2.

Table 1. Mechanical properties of four formulated rubber systems

Table 2. Sliding friction and wear properties of four formulated rubber systems

* The test load is 100N, the test time is 1hr, and the rest of the test methods are the same as other materials.

** Add 3 drops of oil once every hour, 30# engine oil.

Refer to national standards in the performance test of mechanical properties in Table 1: breaking strength (including elongation): GB/T528-1992, compression set: GB/T7759-1992, Shore hardness: GB/T531-1992.

The sliding friction and wear performance test in Table 2 refers to the national standard: GB3960-83.

Claims (4)

1. A kind of HNBR, NBR, NBR/PVC dynamic sealing material that adopts molybdenum disulfide solid lubricant wear-resistant modification, it is characterized in that the component of this dynamic sealing material and the mass percent composition of each composition are: Rubber base material 100 parts; Molybdenum disulfide solid lubricant 0.5-20 parts; Zinc oxide 1 to 10 parts; Enhanced carbon black, 5-150 parts; Stearic acid, 0.1-5 parts; Vulcanizing agent 0.5 to 10 parts; Anti-aging agent, 0.1 to 5 parts; Accelerator, 0.5-10 parts; Plasticizer, 1 to 20 parts; The rubber matrix material is: hydrogenated nitrile rubber HNBR, nitrile rubber NBR or nitrile rubber and polyvinyl chloride blend material NBR/PVC. 2. The wear-resistant modified dynamic sealing material of molybdenum disulfide solid lubricant according to claim 1, characterized in that said solid lubricant is molybdenum disulfide powder with a particle size of 0.1 μm to 10 μm; The agent is 2,5-dimethyl-2,5 (di-tert-butyl peroxy) hexane, dicumyl peroxide or sulfur; the anti-aging agent is 2-mercaptobenzimidazole and N-phenyl - a mixture of 2-naphthylamine (D); the accelerator is triallyl isocyanurate; the plasticizer is dioctyl phthalate. 3. the HNBR, NBR, NBR/PVC dynamic sealing material adopting molybdenum disulfide solid lubricant wear-resistant modification according to claim 1, it is characterized in that the double bond residual rate of described hydrogenated nitrile butadiene rubber is 0.5～ 6%. 4. A preparation method for the HNBR, NBR, NBR/PVC dynamic sealing material that adopts molybdenum disulfide solid lubricant wear-resistant modification according to claim 1, 2 or 3, is characterized in that the specific steps of the method It is as follows: knead each component at a roller temperature of 40-60°C until they are evenly mixed, and the prepared mixed rubber is parked for 16-20 hours; the above-mentioned mixed rubber is re-milled and thinned out, and the mixed rubber is vulcanized and formed. The vulcanization time is 0.5-1.5 hours, the vulcanization temperature is 150-180° C., and the vulcanization pressure is 10-15 MPa.