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Cold-resistant and oil-resistant nitrile rubber for seals and preparation method thereof

A technology of nitrile rubber and seals, applied in the rubber field, can solve the problem of sacrificing the oil resistance of rubber, and achieve the effect of improving rubber performance and increasing elasticity

Active Publication Date: 2022-02-22
宁波市大器密封科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above scheme can improve the performance of rubber at low temperature, its essence is achieved by reducing the proportion of acrylonitrile in the rubber, so the oil resistance of the rubber will be sacrificed while improving the low temperature performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0072] A preparation method of cold-resistant and oil-resistant nitrile rubber for a seal, comprising the following steps:

[0073] 1) Mix and masticate nitrile rubber and modified nitrile rubber for 60-90 minutes, and masticate butadiene rubber for 30-40 minutes.

[0074] 2) Mixing other raw materials with the material obtained in step 1), filtering, and molding to obtain a molded rubber blank.

[0075] 3) Put the molded rubber blank in the mold for pre-vulcanization under pressure and heating, wherein the mold pressure is 175-185kgf / cm 2 , the pre-vulcanization temperature is 150-160°C, and the time is 300-400s.

[0076] 4) Take out the pre-vulcanized rubber obtained in step 3), and place it in a heating device for secondary vulcanization (134-155°C, 20-40min) and tertiary vulcanization (135-145°C, 1-2h).

[0077] 5) Die-cutting the rubber obtained in step 4) to obtain a finished product.

Embodiment 1

[0079] A cold-resistant and oil-resistant nitrile rubber for a seal, comprising the following raw materials in mass percentages:

[0080] Nitrile rubber (the mass ratio of butadiene and acrylonitrile is 70:30) 55%, modified nitrile rubber 8%, butadiene rubber 7%, thermoplastic polyurethane elastomer 3%, aramid staple fiber (0.1mm) 0.5%, zinc oxide 2%, stearic acid 0.5%, inorganic reinforcing agent carbon black 15%, anti-aging agent RD 1%, softening oil TP954%, vulcanizing agent BIPB / TAIC 2%, accelerator DM 2%.

[0081] Its preparation method comprises the following steps:

[0082] Disperse zinc chloride and 2-amino-4,4'-biphenyldicarboxylic acid in water solvent, stir to dissolve, add o-toluic acid template, zinc chloride and 2-amino-4,4'-biphenyldicarboxylic acid The mass ratio of phthalic acid and o-toluic acid is 1:1.5:1.5. Add 2% hydrochloric acid as a solvent and heat to 150°C for hydrothermal reaction for 12 hours, centrifuge the product, wash, dry, and pulverize to ob...

Embodiment 2

[0086] A cold-resistant and oil-resistant nitrile rubber for a seal, comprising the following raw materials in mass percentages:

[0087] Nitrile rubber (the mass ratio of butadiene and acrylonitrile is 75:25) 60%, modified nitrile rubber 5%, butadiene rubber 10%, thermoplastic polyurethane elastomer 1%, aramid short fiber (1.5mm) 0.4%, zinc oxide 3%, stearic acid 0.1%, inorganic reinforcing agent carbon black 15%, anti-aging agent RD 0.5%, softening oil TP953%, vulcanizing agent BIPB / TAIC 1%, accelerator DM 1%.

[0088] Its preparation method comprises the following steps:

[0089] Disperse zinc chloride and 2-amino-4,4'-biphenyldicarboxylic acid in water solvent, stir to dissolve, add o-toluic acid template, zinc chloride and 2-amino-4,4'-biphenyldicarboxylic acid The mass ratio of phthalic acid and o-toluic acid is 1:1:1. Add 1% hydrochloric acid as a solvent and heat to 160°C for hydrothermal reaction for 10 hours, centrifuge the product, wash, dry, and pulverize to obta...

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Abstract

The invention relates to the field of rubber. The invention discloses a cold-resistant and oil-resistant nitrile rubber for a seal and a preparation method thereof, comprising: 50-60% nitrile rubber, 5-10% modified nitrile rubber, and 5-butadiene rubber 10%, thermoplastic polyurethane elastomer 1‑5%, aramid staple fiber 0‑0.5%, zinc oxide 1‑3%, stearic acid 0.1‑1.0%, inorganic reinforcing agent 10‑20%, antioxidant 0.1‑2 %, softening oil 3-5%, vulcanizing agent 1-3%, accelerator 1-3%. The nitrile rubber of the present invention is mixed with an appropriate amount of special modified nitrile rubber under the condition of reducing the acrylonitrile content in a small amount, which can effectively improve the elasticity, wear resistance and mechanical strength of the rubber at low temperature without affecting the oil resistance and other performance.

Description

technical field [0001] The invention relates to the field of rubber, in particular to a cold-resistant and oil-resistant nitrile rubber for sealing parts and a preparation method thereof. Background technique [0002] Nitrile rubber is a synthetic rubber produced by the copolymerization of butadiene and acrylonitrile. The more acrylonitrile content in NBR, the better its oil resistance. Therefore, nitrile rubber is a general-purpose oil-resistant rubber, which is widely used in hydraulic and pneumatic systems such as petroleum machinery, vehicles, and engineering machinery. Among them, nitrile rubber is particularly suitable as a sealing material due to its excellent elasticity, good oil resistance, odor resistance and chemical corrosion resistance, as well as good compression set and heat resistance. However, the performance of nitrile rubber will decrease significantly at low temperature. Its brittle temperature is only around -40°C. If it is used in an environment belo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L9/02C08L51/08C08L9/00C08L77/10C08K13/02C08K3/36C08K3/22C08K5/09C08K3/04B29B7/00B29C35/02C08F289/00C08F236/12C08F212/10
CPCC08L9/02B29C35/0288B29B7/005C08F289/00C08L2205/035C08L2205/16C08L2205/02C08K2201/011C08K2003/2296
Inventor 陈伦平俞科技
Owner 宁波市大器密封科技有限公司