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HNBR rubber compound for dynamic diaphragm sealing element of oil pump

A technology of diaphragm sealing and mixing rubber, which is applied in the direction of products, educts, reagents, etc., can solve the problems of poor low temperature performance of fluororubber, cost, safety and efficiency inconvenience, high replacement frequency, etc., to achieve excellent sealing performance, methanol and diesel resistance Excellent performance and low volume change rate

Pending Publication Date: 2022-07-12
山东道恩特种弹性体材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The oil pump diaphragm seals used in large trucks and trucks are required to be able to adapt to the working conditions of -20-90°C, and have stable performance when subjected to high-frequency vibration in methanol and diesel, ensuring no breakage, no oil leakage, and good maintenance within a service life of at least 720 hours. The tightness of the diaphragm material has high requirements for medium resistance, dynamic mechanical properties, tearing, pressure change and durability. The most commonly used oil pump diaphragm materials in the market are nitrile rubber, fluororubber or polyurethane products. , The high-frequency vibration of nitrile and polyurethane products in the methanol diesel environment for a long time will accelerate the aging of the diaphragm seal, and it needs to be replaced every 20-30 days. The replacement frequency is too high, which brings a lot of inconvenience in terms of cost, safety and efficiency; Poor low temperature performance of fluororubber limits its use

Method used

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  • HNBR rubber compound for dynamic diaphragm sealing element of oil pump
  • HNBR rubber compound for dynamic diaphragm sealing element of oil pump
  • HNBR rubber compound for dynamic diaphragm sealing element of oil pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Accurately weigh 18.50kg of hydrogenated nitrile rubber, 1.95kg of MPU, 1.05kg of zinc oxide, 0.20kg of stearic acid, 4450.51kg of diphenylamines, 0.51kg of zinc salt antioxidant MBZ, 13.90kg of carbon black N330, and mix Ether / ester type plasticizer TP-7592.45kg, sulphur 0.12kg, dicumyl peroxide DCP 0.31kg, N-tert-butyl-2-benzothiazole sulfenamide NS 0.30kg, tetramethyl autumnal disulfide Lamb TMTD 0.2kg;

[0027] Step 2: Mix and masticate the hydrogenated nitrile rubber weighed in step 1 and MPU to reach Mooney 70ML (1+4) at 100°C and park for 24 hours to obtain a hydrogenated nitrile rubber mixture;

[0028] Step 3: Add the hydrogenated nitrile rubber mixture obtained in Step 2 and the weighed zinc oxide, stearic acid, diphenylamine 445, and zinc salt antioxidant MBZ into the mixer at a temperature of 120° C. Mixing for 120s under the condition of 25rad / min and 0.6Mpa top bolt pressure; then put carbon black N330 and mixed ether / ester plasticizer TP-759 weig...

Embodiment 2

[0032] Step 1: Accurately weigh 16.70kg of hydrogenated nitrile rubber, 3.00kg of MPU, 0.99kg of zinc oxide, 0.20K of stearic acid, 4450.49kg of diphenylamine, 0.49kg of zinc salt antioxidant MBZ, 13.39kg of carbon black N330, mix Ether / ester type plasticizer TP-7593.55kg, sulfur 0.10kg, dicumyl peroxide DCP 0.30kg, N-tert-butyl-2-benzothiazole sulfenamide NS 0.49kg, tetramethyl ethylene disulfide Lamb TMTD 0.30kg;

[0033] Step 2: Mix and masticate the hydrogenated nitrile rubber weighed in step 1 and MPU to reach Mooney 68ML (1+4) at 100° C. and then park for 24 hours to obtain a hydrogenated nitrile rubber mixture;

[0034]Step 3: Add the hydrogenated nitrile rubber mixture obtained in Step 2 and the weighed zinc oxide, stearic acid, diphenylamine 445, and zinc salt antioxidant MBZ into the mixer at a temperature of 120° C. 25rad / min, under the condition of top bolt pressure of 0.6Mpa, knead for 120s, then add carbon black N330 weighed in step 1, mixed with ether / ester pla...

Embodiment 3

[0038] Step 1: Accurately weigh 18.39kg of hydrogenated nitrile rubber, 3.10kg of MPU, 1.07kg of zinc oxide, 0.21kg of stearic acid, 4450.54kg of diphenylamine, 0.54kg of zinc salt antioxidant MBZ, 10.76kg of carbon black N330, titanium Potassium acid whisker TiSMO 1.72kg, mixed ether / ester plasticizer TP-7592.58kg, sulfur 0.13kg, dicumyl peroxide DCP 0.43kg, N-tert-butyl-2-benzothiazole sulfenamide NS0 .26kg, tetramethylthiuram disulfide TMTD 0.16kg, trimethylolpropane trimethacrylate TP-3500.11kg;

[0039] Step 2: Mix and masticate the hydrogenated nitrile rubber weighed in step 1 and MPU to reach Mooney 70ML (1+4) at 100°C and park for 24 hours to obtain a hydrogenated nitrile rubber mixture;

[0040] Step 3: Add the hydrogenated nitrile rubber mixture obtained in Step 2 and the weighed zinc oxide, stearic acid, diphenylamine 445, and zinc salt antioxidant MBZ into the mixer at a temperature of 120° C. Mixing for 120s under the condition of 25rad / min and top bolt pressure ...

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Abstract

The invention relates to an HNBR rubber compound for a dynamic diaphragm sealing element of an oil pump. The HNBR rubber compound comprises the following substances in percentage by weight: 40-55% of hydrogenated nitrile rubber, 1-8% of MPU, 3-10% of a compounding agent, 2-5% of an antioxidant, 25-35% of a reinforcing filler, 3-15% of a softening agent, 1-4% of a vulcanizing agent and 0.1-2% of a vulcanization accelerator. According to the invention, HNBRDN-3418 is adopted as main rubber, and the rubber has good medium resistance and aging resistance, and can ensure basic physical properties required by the rubber material. The most prominent performance of the product is that the oil resistance is excellent under the condition of-20 to 90 DEG C, the volume change rate of Astm standard 901 # oil resistance is within 3% under the condition of 150 DEG C * 70h, and the permanent compression deformation and the dynamic fatigue resistance are very excellent. When the diaphragm is used in methanol diesel for a medium and long term, the small-amplitude dynamic fatigue resistance is excellent, and the service life of the diaphragm seal of the oil pump is prolonged to 181 days from the original 30 days.

Description

technical field [0001] The invention belongs to the field of preparation of dynamic diaphragm seals of pumps, in particular to an HNBR compound rubber for dynamic diaphragm seals of oil pumps. Background technique [0002] Oil pump diaphragm seals used in large trucks, trucks, etc. are required to be able to adapt to the working conditions of -20-90 ° C, and have stable performance under high-frequency vibration in methanol and diesel, and ensure that they do not break or leak oil within a service cycle of at least 720 hours. The tightness of the diaphragm material has high requirements on the medium resistance, dynamic mechanical properties, tearing, pressure change and durability of the diaphragm material. The most commonly used oil pump diaphragm materials in the market are nitrile rubber, fluorine rubber or polyurethane products. , the high-frequency vibration of nitrile and polyurethane products in the environment of methanol and diesel for a long time will accelerate t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L15/00C08L75/06C08K5/14C08K3/06C08K5/40C08K5/103C08K13/02
CPCC08L15/005C08L2201/08C08L75/06C08K5/14C08K3/06C08K5/40C08K5/103C08K13/02Y02P20/141
Inventor 邢海琳张世甲杨晓东田洪池沈强岳冬梅
Owner 山东道恩特种弹性体材料有限公司
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