<h1 class="pgc-h-arrow-right" > rubber aging is an inevitable change</h1>
In the production of rubber products, antioxidants are generally used to inhibit the aging of products, thereby prolonging the service life of products. Rubber antioxidants are divided into physical antioxidants and chemical antioxidants, and physical antioxidants are commonly used as paraffin wax. How does paraffin play an anti-aging effect in rubber products, and what should be paid attention to?
<h1 class="pgc-h-arrow-right" >1. Paraffin characteristics and function </h1>
Paraffin wax is a white, odorless waxy solid with an alkane structure, paraffin is a mixture of straight-chain alkanes, branched-chain alkanes and cyclic hydrocarbons. Paraffin wax commonly used in rubber is ordinary paraffin wax, microcrystalline wax, rubber protective wax. Paraffin wax in rubber as a physical protective agent or softener, can improve the anti-aging of the rubber material, increase the flexibility of the rubber material.
<h1 class="pgc-h-arrow-right" >2. Paraffin protection principle</h1>
Paraffin wax HY17S8J2L does not participate in the reaction during vulcanization, only dissolved in rubber, when the vulcanization is cooled, it is in a supersaturated state, it slowly migrates to the surface of the vulcanized rubber, forming a protective film to isolate the erosion of oxygen and ozone in the air, thus playing an anti-aging role.
<h1 class="pgc-h-arrow-right" >3</h1>
(1) The protective film of paraffin wax must be dense and uniform, and it must have a certain thickness in order to play a protective role. The protective film is too thin to play a protective role, so the protective film must have a certain thickness, otherwise it is easy to crack or fall off under the action of force, and the thickness of the protective film is about 0.5 microns. (2) The protective film must have strong adhesion with the rubber to prevent shedding. In addition to the adhesion related to the paraffin itself, it is also related to the formulation of the rubber. (3) The protective film needs to have a certain stiffness, that is, ductility, and the protective film with poor ductility is easy to rupture under the action of force. (4) The protective film must have the corresponding ability to resist high and low temperatures.
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<h1 class="pgc-h-arrow-right" >4</h1>
Ordinary paraffin wax migrates faster in rubber and can form a protective film faster. The migration rate of microcrystalline wax in rubber is relatively slow, the time to form a protective film is slightly longer, and the protective effect is longer. The speed at which rubber protective waxes migrate in rubber is somewhere in between.
Different varieties of paraffin have different solubility in rubber, ordinary paraffin wax > rubber protective wax > microcrystalline wax. Paraffin wax will migrate to the rubber surface when the amount exceeds its solubility, but the amount is too much, the protective film is too thick, easy to crack and fall off, but affects the protective effect.
In the selection of paraffin wax according to the use of rubber products temperature range, rubber products processing technology, rubber products service life, reasonable selection of paraffin wax, reasonable arrangement of paraffin wax use. In order to improve the protective effect of rubber products, in actual production, it can be used together with other antioxidants to improve the protective effect and prolong the service life.
Original title: Paraffin wax in rubber products in the protective role and use