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Material for nylon elastomer coupler knuckle pin of rail wagon and preparation method of material

A railway freight car and nylon technology is applied to the material and preparation field of the nylon elastomer coupler yoke pin for railway freight cars, which can solve the problems of large amount of wear, bad working conditions, cracked hook ear hole bushing and the like, and achieves improved toughness. , high tensile modulus, reducing wear and tear

Active Publication Date: 2014-04-23
JIANGSU TIEKE NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The two wagons of high-speed and heavy-duty railway freight cars are connected by couplers. The knuckle part of the coupler is rigidly connected and riveted by the knuckle pin; The working conditions are harsh, and stress concentration is prone to occur, causing the knuckle pin to bend and crack, and the bushing of the hook ear hole to wear and tear
Due to the large amount of wear and tear, the repair work is heavy and the labor intensity of the workers is high. It is difficult to restore the original performance after welding and repair, which seriously affects the driving safety.

Method used

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  • Material for nylon elastomer coupler knuckle pin of rail wagon and preparation method of material

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Effect test

Embodiment 1

[0012] The material for the nylon elastomer coupler knuckle pin of the railway freight car of this embodiment has the following components and weight percentages: nylon 1212, 70%; maleic anhydride grafted ethylene-propylene-diene copolymer (MAH-g-EPDM), 12 %; maleic anhydride grafted polyethylene (MAH-g-HDPE), 10%; nucleating agent P22, 3%; silicone, 3%; antioxidant H10, 1%; paraffin, 0.5%; white oil ( C16~C31 mixture of normal isoparaffins, type P60), 0.5%.

[0013] The preparation method of the nylon elastomer coupler knuckle pin of railway freight cars using the above materials comprises the following steps: (1) weighing nylon 1212, maleic anhydride grafted EPDM copolymer, maleic anhydride grafted poly Ethylene, silicone, paraffin, nucleating agent P22, antioxidant H10, and special white oil are put into a high-speed mixer and stirred for 5-10 minutes;

[0014] (2) Discharge after stirring, and then extrude and granulate through a twin-screw extruder at a processing temper...

Embodiment 2

[0017] The material for the nylon elastomer coupler knuckle pin of railway freight cars in this embodiment has the following components and weight percentages: nylon 1212, 75%; maleic anhydride grafted ethylene-propylene-diene copolymer (MAH-g-EPDM), 10 %; maleic anhydride grafted polyethylene (MAH-g-HDPE), 8%; nucleating agent P22, 2.5%; silicone, 2.5%; antioxidant H10, 1%; paraffin, 0.5%; white oil ( C16~C31 mixture of normal isoparaffins, type P60), 0.5%.

[0018] The preparation method of the nylon elastomer coupler knuckle pin of railway freight cars using the above materials comprises the following steps: (1) weighing nylon 1212, maleic anhydride grafted EPDM copolymer, maleic anhydride grafted poly Ethylene, silicone, paraffin, nucleating agent P22, antioxidant H10, and special white oil are put into a high-speed mixer and stirred for 5-10 minutes;

[0019] (2) Discharge after stirring, and then extrude and granulate through a twin-screw extruder at a processing temper...

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Abstract

The invention relates to a material for a nylon elastic coupler knuckle pin of a rail wagon, which comprises the following components by weight percentage: 65-80% of nylon 1212, 5-20% of maleic anhydride grafted ethylene-propylene-diene terpolymer, 5-20% of maleic anhydride grafted polyethylene, 0.5-5% of nucleating agent P22, 0.5-5% of silicone, 0.1-1.5% of antioxygen H10, 0.1-2% of paraffin and 0.1-1% of special white oil. The material for the nylon elastic coupler knuckle pin of the rail wagon is a high-polymer elastic material with better elasticity and toughness; for the coupler knuckle pin of the rail wagon, which is made of the material, the contact among a coupler knuckle, the coupler knuckle pin and a coupler lug hole is changed to flexible collision from the original rigid collision, the coupler knuckle pin is further higher in tensile modulus, impact strength and abrasion resistance, and the abrasion and cracking of the coupler knuckle, coupler lug hole bushing and other components are reduced.

Description

technical field [0001] The invention relates to a material for a nylon elastic coupler knuckle pin of a railway freight car and a preparation method thereof. Background technique [0002] The two wagons of high-speed and heavy-duty railway freight cars are connected by couplers. The knuckle part of the coupler is rigidly connected and riveted by the knuckle pin; The working conditions are harsh, and stress concentration is prone to occur, causing the knuckle pin to bend and crack, and the bushing of the hook ear hole to wear and tear. Due to the large amount of wear and tear, the repair workload is large and the labor intensity of the workers is high. It is difficult to restore the original performance after welding and repair, which seriously affects the driving safety. [0003] How to provide a coupler knuckle pin with high impact strength, wear resistance and high tensile modulus is a technical problem to be solved in this field. Contents of the invention [0004] The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/06C08L51/06C08L83/04C08K5/01B29C47/92B29C48/92
CPCB29C48/04B29C48/40B29C48/92B29C2948/9259B29C2948/92676B29C2948/92704B29C2948/92828B29C2948/92885B29C2948/92895
Inventor 丁雷刘春岐谭飞宋昆
Owner JIANGSU TIEKE NEW MATERIAL CO LTD
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