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Valve bush rubber and its preparation method

A production method and rubber technology, applied in valve details, valve device, valve shell structure, etc., can solve the problems of low rubber performance of valve bushings, reduced valve sealing performance, poor chemical corrosion resistance, etc., and achieve anti-vulcanization reduction. and excellent aging resistance, improving heat resistance and thermal stability

Inactive Publication Date: 2006-02-15
天津凯发阀门有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for this valve with rubber bushing, when the temperature of the medium passing through is about 100°C or is chemically corrosive, the sealing performance of the valve is quickly reduced so that it cannot be used, and the service life is short.
The reason is: the rubber performance of valve lining is poor, its wear resistance is poor, high temperature resistance is poor, water resistance is poor, chemical corrosion resistance is poor
Under normal circumstances, the tensile strength is 10-12Mpa; the elongation at break 40%
[0004] Due to the low performance of the valve lining rubber, when the valve is opened and closed repeatedly in high temperature, water or acid-base medium, the wear between the various parts of the valve and the erosion of the medium will cause the rubber lining of the valve parts to wear and age. , so as to lose the sealing performance and need to be replaced, resulting in a short service life of this type of valve; under normal circumstances, the current rubber-lined valves that transport high-temperature media such as acids, alkalis, organic solutions, water or steam have a service life of 3- about 5 months

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] (1) Batching; according to the following weight ratios, each component is weighed successively for later use

[0063] 60 / 40 EPDM 52.00Kg

[0064] Active Zinc Oxide 3.20Kg

[0065] Organic active agent stearic acid 0.52Kg

[0066] Quinoline polymer RD 0.62Kg

[0067] Carbon black HAF 12.50Kg

[0068] Oil-based Furnace Black SRF 18.30Kg

[0069] Silicon nitride compound 6.23Kg

[0070] Dimethyl phthalate 2.70Kg

[0071] Dispersant T-78 0.89Kg

[0072] Wetting agent 935P 0.63Kg

[0073] Thiuram 0.21Kg

[0074] Peroxide DCP 2.00Kg

[0075] Sulfur 0.20Kg

[0076] Total 100.00kg

[0077] Second, mixing:

[0078] Use an internal mixer for mixing, the roller temperature is 70°C, and the mixing time is 8 minutes;

[0079] First, the 60 / 40 EPDM rubber is rolled and milled, and then the following ingredients are added in sequence;

[0080] 1, activated zinc oxide 2, carbon black HAF, oil-based furnace black SRF, silicon nitrogen compound, dimethyl phthalate, dispersa...

Embodiment 2

[0098] (1) Batching; according to the following weight ratios, each component is weighed successively for later use

[0099] 60 / 40 EPDM 52.00Kg

[0100] Active Zinc Oxide 3.50Kg

[0101] Organic active agent stearic acid 0.60Kg

[0102] Quinoline polymer RD 0.83Kg

[0103] Carbon black HAP 12.00Kg

[0104] Oil-based Furnace Black SRF 18.00Kg

[0105] Silicon nitride compound 6.50Kg

[0106] Dimethyl phthalate 2.00Kg

[0107] Dispersant T-78 0.97Kg

[0108] Wetting agent 935P 0.70Kg

[0109] Thiuram 0.20Kg

[0110] Peroxide DCP 2.50Kg

[0111] Sulfur 0.20Kg

[0112] Total 100.00Kg

[0113] Second, mixing:

[0114] Add the above components according to the feeding order of Example 1; use an internal mixer for mixing, the roller temperature is 80°C, and the mixing time is 8 minutes; after being uniformly mixed, the next piece is cooled and stored in storage.

[0115] Three, injection:

[0116] Use a rubber injection machine to inject the mixed rubber into a mold wit...

Embodiment 3

[0130] 1. Ingredients; according to the following weight ratios, each component is weighed in turn for later use

[0131] 60 / 40 EPDM 51.00Kg

[0132] Active Zinc Oxide 4.00Kg

[0133] Organic active agent stearic acid 0.50Kg

[0134] Quinoline polymer RD 0.65Kg

[0135] Carbon black HAP 13.00Kg

[0136] Oil-based Furnace Black SRF 18.00Kg

[0137] Silicon nitride compound 5.50Kg

[0138] Dimethyl phthalate 3.00Kg

[0139] Dispersant T-78 1.20Kg

[0140] Wetting agent 935P 0.70Kg

[0141] Thiuram 0.20Kg

[0142] Peroxide DCP 2.00Kg

[0143] Sulfur 0.25Kg

[0144] Total 100.00Kg

[0145] Second, mixing:

[0146] Add the above components according to the feeding order of Example 1; use an open mill for mixing, the roller temperature is 40°C, and the mixing time is 20 minutes; after being uniformly mixed, the next piece is cooled and stored in storage.

[0147] Three, injection:

[0148] The rubber injection machine is used to inject the mixed rubber into the mold with...

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Abstract

The rubber for valve bushing with well anti-abrasive, chemical-resisting, thermostable and waterproof property comprises constituents as: 60 / 40 EPT, activated zinc oxide, organic activated agent stearic acid 0, quinoline polymer, HAF, and sulfur. After milling, inject the material with rubber syringe on piston pressure (2.5-3.0)kg / cm2 and temperature of 40-50Deg into directly on the surface of the objective valve part in mould; vulcanizing and covering the rubber layer. The product can be used on pipes for steam and acid / alkali medium more than one year.

Description

Technical field: [0001] The present invention relates to a kind of rubber and its preparation method. In particular, a rubber for valve bushings and a method of making the same. Background technique: [0002] In industries such as petroleum, chemical, pharmaceutical, power generation, metallurgy, food and construction, for the valves in pipeline facilities that transport media such as water, steam, acid, alkali and organic solutions, due to the high temperature, high pressure and chemical Corrosive, the parts in the inner cavity of the valve are generally lined with rubber bushings, which isolate the medium from the metal parts in the inner cavity of the valve to avoid damage and corrosion. The rubber bushing is integrated with the metal part of the inner cavity of the valve, which ensures the high sealing performance of the valve and prolongs the service life of the valve. [0003] Valves with rubber bushings appeared at the end of the twentieth century. But this kind of...

Claims

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Application Information

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IPC IPC(8): C08L23/16C08K5/40F16K27/00
Inventor 刘志新刘玉山
Owner 天津凯发阀门有限公司
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