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The role of zinc oxide in rubber
Release time:
14 Sep,2020
Since zinc oxide and rubber ♥✔∞molecules are positively charged du§ring processing, they have the samβ₩e properties and repel eac≈Ωh other, making it difficult to disperse in rubb®♥er. When added with stearic acid, it f≈€δσorms during mixing. Zinc stearate is easy ∏✔αto disperse.
Zinc oxide is primarily used as an active agλδent (I. e., auxiliary accelerator) in rubber mβ∏ixtures.
Because the zinc oxide ad↕>ded to the rubber reac₩Ωε∑ts with the accelerator to form a zi↔δnc salt complex, the 2n2 particlesλα∞ with empty orbitals have strong po↑←λ∑larization ability and can easily prom ©'ote the cleavage of sulfu₩✘←r ring molecules, thereby proβγ>moting the vulcanization o©™₹γf rubber. Why use it with stearic acid? Since ziσ nc oxide and rubber mo•">lecules are positively charged durin★÷≠g processing, they have the samδαe properties and repel each oth↕λer, making it difficult ★'to disperse in rubber. When added with stearic ac♠∞id, it forms during mixing. Zinc sσ↑tearate is easy to disperse.
Zinc oxide is also an excellent thermal and heΩ €φat capacity agent in β ↔rubber.
The thermal conductivity of zinc oxide is 2.5 timδ "es that of carbon black a↓$&₹nd 5 times that of rubber; its heat capa©&®≈city is twice that of carbon black. Why'π✘α is the amount of zinc oxide used i£♠©±n the inner rubber (cushiβσ♥on rubber), patching rub•ε÷₩ber and cushion rubber used for retreadin♥≠≈g larger? This is because the inner r<→ →ubber is located between the tr ©↔ead and the carcass, the fiα lling hole is located in the carcass, and t™ he cushion rubber is located between th≈™Ω₩e liner and the inner layer o₹↕'€f the carcass. When the tire is repeatedly×ε compressed, stretched anπ♣d bent during high-load, <✘high-speed and continuous driving,★' heat will inevitably be generated. Z±εσinc oxide in stock supply In order to r→•educe the heat accumulatioε&✘¶n in these parts, it is necessary to make σ☆>the glue in these parts dissipate as soon•&$ as possible and have a large heat cap £☆acity. Therefore, the glue in th¶©∞✘ese parts has a larger zinc oxide. Zinc oxide isπα also a reinforcing agent and a color∏"±€ant.
The direct method is also known as the America∞n method. It uses ore •✔as raw material, througε≤h high temperature r₹π$eduction and oxidation, directly φπ←✔obtains zinc oxide products, zinc oxide for glass& ≠φ, and zinc oxide for ceramic glaze.
Indirect zinc oxide, wh♥←ich uses high-purity zi↑¥←♦nc ingots as raw materials↑•α to obtain zinc oxide through high-temperat•©ure sublimation and oxidatio±≠≥n. It is a method of produc∑ing zinc oxide and ind↕>$™irect method zinc oxide tγ<hat has appeared in recent years.
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