The main methods of rubber vulcanization are as follows:<\/p>\n\n\n\n
A. Sulfur vulcanization<\/strong><\/p>\n\n\n\n This is the oldest, most traditional, and most widely used method of vulcanization (invented by<\/p>\n\n\n\n Charles Goodyear).<\/p>\n\n\n\n Principle: Sulfur is used as a crosslinking agent to form sulfur bonds (single, double, or multiple<\/p>\n\n\n\n sulfur bonds) between rubber molecular chains at high temperatures.<\/p>\n\n\n\n Applicable rubber: Natural rubber (NR), styrene-butadiene rubber (SBR), nitrile rubber (NBR), and<\/p>\n\n\n\n other general synthetic rubbers.<\/p>\n\n\n\n Characteristics: Low cost, mature technology, and excellent physical and mechanical properties (e.<\/p>\n\n\n\n g., high elasticity and strength). Disadvantages include relatively poor heat resistance (polysulfide<\/p>\n\n\n\n bonds tend to break at high temperatures) and potential sulfur frost phenomenon.<\/p>\n\n\n\n B. Peroxide vulcanization<\/strong><\/p>\n\n\n\n This is a common vulcanization method used in silica gel and certain specialty rubbers, and it was<\/p>\n\n\n\n the primary method for silica gel vulcanization before platinum vulcanization. Principle: Organic<\/p>\n\n\n\n peroxides (such as 2,5-dimethyl-2,5-bis(tert-butylperoxycyclohexane)) are employed as vulcanizing<\/p>\n\n\n\n agents. When heated, the peroxides decompose to generate free radicals, which initiate cross\u0002<\/p>\n\n\n\n linking of rubber molecular chains, forming carbon-carbon bonds.<\/p>\n\n\n\n Applicable rubber types: silicone rubber (old process), ethylene propylene diene monomer<\/p>\n\n\n\n (EPDM), fluororubber (FKM), etc.<\/p>\n\n\n\n Characteristics: The formed carbon-carbon bonds have high bond energy, thus the heat resistance<\/p>\n\n\n\n of the product is superior to that of sulfur vulcanization. However, the drawbacks include the<\/p>\n\n\n\n generation of small molecular by-products with strong odors (such as phenyl ethyl ketone) during<\/p>\n\n\n\n the vulcanization process, and the mold is prone to contamination (scum accumulation).<\/p>\n\n\n\n Additionally, the transparency of the product is generally inferior to that of platinum vulcanized<\/p>\n\n\n\n silicone rubber.<\/p>\n\n\n\n C. Platinum Cured<\/strong><\/p>\n\n\n\n Platinum vulcanization is a kind of addition vulcanization of silica gel. In this process, the<\/p>\n\n\n\n molecular chain of silica gel cross-link under the action of platinum catalyst, and change from<\/p>\n\n\n\n plastic linear structure to elastic three-dimensional network structure.<\/p>\n\n\n\n Key features of platinum-based silicone rubber:<\/p>\n\n\n\n Food-grade\/medical-grade safety: This is its greatest advantage. No toxic by-products (such as<\/p>\n\n\n\n ketones or carboxylic acids generated during peroxide vulcanization) are produced during the<\/p>\n\n\n\n vulcanization process, making it particularly suitable for products that come into contact with food<\/p>\n\n\n\n and the human body (e.g., baby bottles and nipples, baking molds, medical devices).<\/p>\n\n\n\n Odorless and free of precipitates: The product is typically odorless, with extremely high<\/p>\n\n\n\n transparency and a smooth surface.<\/p>\n\n\n\n Excellent heat resistance, weather resistance and chemical stability.<\/p>\n\n\n\n Environmental compliance: Meets stringent food contact material standards, including FDA (U.S.<\/p>\n\n\n\n Food and Drug Administration) and LFGB (German Food and Consumer Goods Act).<\/p>\n\n\n\n D Metal Oxide Vulcanization<\/strong><\/p>\n\n\n\n Principle: Use metal oxides (e.g., zinc oxide, magnesium oxide) as vulcanizing agents.<\/p>\n\n\n\n Applicable rubber: chloroprene rubber (CR), chlorosulfonated polyethylene rubber (CSM),<\/p>\n\n\n\n chlorinated polyethylene (CPE), etc.<\/p>\n\n\n\n Characteristics: This type of rubber typically contains halogens, and metal oxides can react with<\/p>\n\n\n\n hydrogen halides to promote cross-linking.<\/p>\n\n\n\n E. Resin Vulcanization<\/strong><\/p>\n\n\n\n Principle: using alkyl phenolic resin as vulcanizing agent.<\/p>\n\n\n\n Applicable rubber: butyl rubber (IIR), ethylene propylene diene monomer (EPDM).<\/p>\n\n\n\n Characteristics: Primarily used for butyl rubber, it exhibits excellent heat resistance in vulcanized<\/p>\n\n\n\n rubber and is commonly applied in thermally vulcanized capsules or tire air-tight layers.<\/p>\n\n\n\n <\/p>\n\n\n\n Summary<\/p>\n\n\n\n If you’re seeking reliable sealing solutions for your equipment or have further questions about<\/p>\n\n\n\n vulcanization processes, feel free to contact us anytime. We’ll safeguard your equipment with our<\/p>\n\n\n\n professional expertise.<\/p>\n\n\n\n BOSS \u5bc6\u5c01\u89e3\u6c7a\u65b9\u6848<\/p>\n\n\n\n Henry, sales@bosssealing.com; WhatsApp\uff1a+86 13392768056<\/p>\n\n\n\n <\/p>","protected":false},"excerpt":{"rendered":" The main methods of rubber vulcanization are as follows: A. Sulfur vulcanization This is the oldest, most traditional, and most widely used method of vulcanization (invented by Charles Goodyear). Principle: Sulfur is used as a crosslinking agent to form sulfur bonds (single, double, or multiple sulfur bonds) between rubber molecular chains at high temperatures. Applicable […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1540","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\tSulfurization<\/strong>
method<\/strong><\/td>Applicable rubber<\/strong><\/td> Merit<\/strong><\/td> Shortcoming<\/strong><\/td> Typical application<\/strong><\/td><\/tr> Platinum sulfide<\/td> \u77fd\u916e<\/td> The safest, odorless,
transparent, and envir\u0002
onmentally friendly<\/td>High cost and strin\u0002
gent requirements for
raw material purity<\/td>Infant products, medical
implants, high-end baking
molds<\/td><\/tr>Sulfur sulfidat\u0002
ion<\/td>Natural rubber,
styrene-butadiene
rubber, etc.<\/td>Low cost, high strength,
and mature manufactu\u0002
ring process<\/td>Odor, may froth,
average heat resist\u0002
ance<\/td>Tires, belts, hoses, and
shoe soles<\/td><\/tr>Peroxide cure<\/td> Silicone rubber,
EPDM rubber, fluo\u0002
rocarbon rubber<\/td>\u8010\u71b1\u6027\u597d
and low permanent
compression deformat\u0002
ion<\/td>Odor, mold suscept\u0002
ibility, and high shr\u0002
inkage rate<\/td>Automotive sealing parts,
heat resistant hose, cable<\/td><\/tr>Metal oxide sul\u0002
fide<\/td>Chloroprene rubber<\/td> Fast sulfidation rate and
excellent physical pro\u0002
perties<\/td>Storage prone to sc\u0002
orching and increa\u0002
sed specific gravity<\/td>Wires and cables, adhesi\u0002
ves, industrial products<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n