Halogen-free flame retardant foamed EVM (ethylene vinyl acetate copolymer) rubber and manufacturing method thereof

Abstract

The invention discloses halogen-free flame retardant foamed EVM (ethylene vinyl acetate copolymer) rubber and a manufacturing method thereof. The rubber is prepared from the following raw materials inparts by weight: 100 parts of EVM 500PXL, 10-20 parts of carbon black N774, 5-7 parts of a plasticizer DOS, 5-7 parts of a plasticizer TOTM, 1-2 parts of zinc stearate, 1-2 parts of a dispersing agent, 1-2 parts of polyethylene wax, 4-6 parts of a foaming agent HH138, 2-3 parts of a cross-linking agent BIBP, 1-2 parts of a cross-linking agent TAIC, 3 parts of an antihydrolysis agent P50, 1-2 parts of preservation wax, 1-2 parts of an anti-aging agent 445, 1-2 parts of an anti-aging agent TMQ and 80-120 parts of flame-retardant fillers. The manufacturing method comprises the following steps: kneading and milling the raw materials, so as to obtain a rubber compound material; feeding the rubber compound material into a pin cold feed extruder, so as to extrude a higher-density preformed film;slicing the preformed film on a conveying belt at a fixed length, so as to obtain a film with the fixed length; performing primary sulfurization foaming on the film with the fixed length with a primary square mould and secondary sulfurization foaming on the film with the fixed length with a secondary square mould; naturally cooling for 10-15 days under a normal temperature, so as to obtain the halogen-free flame retardant foamed EVM rubber. The EVM rubber is strong in toughness, good in heat preservation and good in elasticity and is high-low temperature-resistant, anti-aging, oil-resistant,halogen-free, flame-retardant, environmentally friendly and non-toxic.

Description

technical field [0001] The invention relates to a foamed rubber, in particular to a halogen-free flame-retardant foamed EVM rubber. The invention also relates to a method for manufacturing the halogen-free flame-retardant foamed EVM rubber. Background technique [0002] SBR, EPDM, CR, NBR, NBR / PVC and other foamed rubbers are mainly used in the market at present. These foamed rubbers have certain limitations in performance. For example, although SBR foamed rubber is a general-purpose foamed rubber, it is not resistant to aging. , Not oil-resistant and not flame-retardant; EPDM foam rubber has good aging resistance, but it is not oil-resistant and flame-retardant; CR foam rubber is soft, oil-resistant, aging-resistant and flame-retardant, but it produces toxic and corrosive gases when burned; NBR foam rubber Foam rubber is oil-resistant but not flame-retardant, and has poor aging performance; NBR / PVC foam rubber is oil-resistant and flame-retardant, but it releases toxic and...

AI Technical Summary

Problems solved by technology

Obviously, the existing foamed EPDM rubber cannot meet the strict requirements for the use of foamed rubber in the fields of medical treatment, aviation and navigation, high-speed rail, and special shoes.