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Oil resistant seal ring and preparation method thereof

An oil-resistant sealing ring and accelerator technology, used in the field of rubber products, can solve the problems of large geometric size tolerance, high three-pack products, decreased strength, etc., to achieve small compression permanent deformation, solve oil leakage, and large elongation. Effect

Inactive Publication Date: 2015-09-09
QINGDAO BAOFENGSHENG FUHUA IMPORT & EXPORT SEALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rubber sealing rings currently used are generally made of styrene-butadiene rubber, EPDM rubber, ordinary low-medium acrylonitrile content nitrile rubber and general chemical auxiliary materials. Although it can seal DOT3 brake fluid, the rubber The ring swells severely in the spindle oil brake fluid, the hardness decreases, and the strength decreases, resulting in oil leakage and loss of sealing effect due to volume expansion, large geometric size tolerance, and physical property decline in the early stage of the apron, especially during use. The quality of the package is too high, and the customer has a lot of feedback on this, asking for rectification

Method used

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  • Oil resistant seal ring and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1: a kind of oil-resistant sealing ring, its component content ratio is by weight:

[0030] 100 parts of nitrile rubber 220S with high acrylonitrile content;

[0031] Quickly extrude carbon black N550 for 70 minutes;

[0032] Polyether type cold-resistant plasticizer TP-95 8 parts;

[0033] The parts by weight of accelerator are 4.6 parts, which are respectively 1.0 part of TMTD, 1.0 part of TETD, 0.6 part of DTDM, and 2 parts of CZ;

[0034] The parts by weight of antioxidant are 3.5 parts, which are respectively 1.5 parts of RD and 2 parts of 4010NA;

[0035] Zinc oxide 4 parts;

[0036] Active agent stearic acid 1 part;

[0037] 0.56 parts of vulcanizing agent sulfur;

[0038] Operation aid TM-80 1.1 parts.

Embodiment 2

[0039] Embodiment 2: a kind of oil-resistant sealing ring, its component content ratio is by weight:

[0040] 100 parts of nitrile rubber 220S with high acrylonitrile content;

[0041] Quickly extrude 75 parts of carbon black N550;

[0042] Polyether type cold-resistant plasticizer TP-95 10 parts;

[0043] The parts by weight of accelerator are 5 parts, respectively 1.1 parts of TMTD, 1.2 parts of TETD, 0.6 parts of DTDM, and 2.1 parts of CZ;

[0044] The weight portion of antioxidant is 4 parts, is respectively 2 parts of RD, 2 parts of 4010NA;

[0045] 5 parts of zinc oxide;

[0046] 1.5 parts of active agent stearic acid;

[0047] 0.6 parts of vulcanizing agent sulfur;

[0048] Operation aid TM-80 1.5 parts.

Embodiment 3

[0049] Embodiment 3: A kind of preparation method of oil-resistant sealing ring, completes batching according to the rubber process formula weight ratio of embodiment 1, comprises the following steps:

[0050] Step 1: Mixing

[0051] Put the nitrile rubber into the internal mixer and press for 1 to 2 minutes, then add zinc oxide, stearic acid, sulfur, anti-aging agent and operating aids and press for 2 to 3 minutes, then add carbon black and press for 6 to 7 minutes. Minutes, finally add plasticizer and knead for 2 to 3 minutes, mixing temperature 105°C; deglue temperature 135°C, after the deglue and lower sheet cool down, add accelerator on the open mill at a low temperature below 50°C, and make triangular bags for 3~ 4 times, thin pass 2 to 3 times, and the next piece is cooled and stored for later use;

[0052] Step Two: Extrusion Process

[0053] The head temperature of the precision preforming machine is adjusted to 55°C, and the die temperature is 70°C. While extruding...

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Abstract

Belonging to the technical field of rubber products, the invention mainly relates to an oil resistant seal ring for engineering machinery braking devices and a preparation method thereof. The oil resistant seal ring is characterized by containing the following components by weight: 100 parts of nitrile butadiene rubber 220S; 70-75 parts of carbon black N550; 8-10 parts of a plasticizer TP-95; 4.5-5 parts of a promoter; 3-4 parts of an antiager; 4-5 parts of zinc oxide; 1-1.5 parts of active agent stearic acid; 0.5-0.6 part of vulcanizing agent sulfur; and 1-1.5 parts of an operation aid TM-80. Compared with the prior art, the oil resistant seal ring and the preparation method provided by the invention have the advantages that: 1. the oil resistant seal ring has moderate hardness, high strength, large elongation, small compression set, good elasticity, spindle oil resistance, and resistance to DOP3 brake fluid; and 2. the oil resistant seal ring prepared by the method provided by the invention achieves the performance requirements of Japanese industrial standards JIS B 2401 3, and after customer installation use, the oil leakage phenomenon is solved.

Description

[0001] technical field [0002] The invention belongs to the technical field of rubber products, and mainly relates to an oil-resistant sealing ring used in an engineering machinery braking device and a preparation method thereof. Background technique [0003] At present, the rubber sealing rings used in the braking devices of engineering machinery such as loaders, excavators, bulldozers, etc. need to have a good sealing effect to ensure flexible braking, strong braking, and easy operation. However, the rubber sealing rings currently used are generally made of styrene-butadiene rubber, EPDM rubber, ordinary low-medium acrylonitrile content nitrile rubber and general chemical auxiliary materials. Although it can seal DOT3 brake fluid, the rubber The ring swells severely in the spindle oil brake fluid, the hardness decreases, and the strength decreases, resulting in oil leakage and loss of sealing effect due to volume expansion, large geometric size tolerance, and physical pro...

Claims

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Application Information

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IPC IPC(8): C08L9/02C08K13/02C08K3/04C08K3/22C08K5/09B29B7/72B29C35/02
CPCC08K13/02B29B7/74B29C35/02B29C37/02B29C48/92B29C2948/92704C08K3/04C08K3/22C08K5/09C08K2003/2296C08L9/02
Inventor 高福年张先明
Owner QINGDAO BAOFENGSHENG FUHUA IMPORT & EXPORT SEALS
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