Ethylene-propylene-diene monomer rubber sealing membrane for water dispenser and production process thereof

Abstract

The invention provides an ethylene-propylene-diene monomer rubber sealing membrane for a water dispenser and a production process thereof. The ethylene-propylene-diene monomer rubber sealing membranefor the water dispenser comprises the following raw materials in parts by weight: 100 parts of an ethylene-propylene-diene monomer, 1-5 parts of zinc oxide, 0.5-2 parts of stearic acid, 0.5-4 parts ofa dispersant, 30-70 parts of carbon black, 6-20 parts of a filler, 10-40 parts of a plasticizer, 1-5 parts of a vulcanizing agent, and 1-5 parts of a vulcanizing auxiliary agent; the vulcanizing agent is 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, and the vulcanizing auxiliary agent is ethylene dimethacrylate. The vulcanizing agent is 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane; the vulcanizingauxiliary agent is ethylene dimethacrylate, and no sulfhydryl group is generated during the reaction; anti-aging agents are not needed, addition of sulfhydryl groups is eliminated from the raw materials; therefore, the product does not produce bitterness, the boiling process is not needed, production efficiency is improved, manpower and material resources are reduced, and production costs is reduced; traditional anti-aging agents are not needed, product performance is superior to performance of traditional rubber products.

Description

Technical field [0001] The invention relates to the technical field of sealing diaphragms, in particular to an EPDM rubber sealing diaphragm for drinking fountains and a production process thereof. Background technique [0002] The water dispenser is usually equipped with a sealing diaphragm, which needs to be in contact with 110°C drinking water during use, and therefore must meet relevant laws and regulations. [0003] In traditional rubber formulations, vulcanization accelerators and antioxidants are usually present. Commonly used vulcanization accelerators are N-cyclohexyl-2-benzothiazole sulfenamide, benzothiazole disulfide, and tetramethylthiuram disulfide. The above vulcanization accelerators will react with other substances during the vulcanization process. Generate sulfhydryl groups. Commonly used antioxidants, such as dithiol benzimidazole, have sulfhydryl groups themselves. [0004] The sulfhydryl group has a bitter taste or a chemical reaction occurs at high temperatur...

AI Technical Summary

Problems solved by technology

Rubber products made of the above materials will release substances that are harmful to human health and produce unpleasant tastes and odors during long-term contact with hot water or superheated water

Many rubber products cannot pass FDA, DVG, WRAS, NSF and other wading certifications

[0005] In the current manufacturing process, in order to solve the problem of odor in drinking water after rubber products are in contact with high-temperature drinking water, the process of boiling rubber products for 3-6 hours is usually used to remove the odor. This method wastes manpower, material resources, and resources, and increases the cost of the product.

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