What do you pay attention to when using rubber?
The greater the polarity of the rubber, the better the bonding effect. Among them, nitrile butadiene chloroprene rubber is of great polarity and strong adhesive strength. Natural rubber, silicone rubber and isobutyl rubber have less polarity and weak cohesive force. In addition, the rubber surface often has the release agent or other free out auxiliaries, hinders the adhesive effect.Adhesive is used to connect rubber, and the concrete methods are divided into hot sticking method and cold sticking method.Hot sticking method is realized by adhesive plastication of unvulcanized rubber and glued rubber together after curing, the method is complicated, need to heating and pressurizing equipment, inconvenient to use.Cold adhesive method is to apply the adhesive to the surface of the glued product. After airing, fold it and solidify it at room temperature. Of course, proper heating can shorten the curing time and increase the bonding strength. Cold sticking method is simple and energy saving. It is a good method to be popularized.
Oil: in the process of use, if it has long-term contact with the oil medium, the oil can penetrate into the interior of the rubber to produce swelling, resulting in lower strength and other mechanical properties of the rubber. Oil can cause swelling of rubber, because oil penetrated rubber, resulting in the proliferation of molecules, so that the network structure of vulcanized rubber changes.
Water: the moisture content has two aspects: rubber in the humid air or rain soaked in water, easy to damage, this is because the rubber of water-soluble substances and hydrophilic components by water extraction solution, hydrolysis or other reasons caused by absorption. Especially in the water immersion and atmospheric exposure of alternating action, will accelerate the destruction of rubber. But in some cases water does not damage rubber and even retard ageing.
Note the aging of rubber rubber rubber and its products in the processing, storage and use of the process, due to the comprehensive effect of internal and external factors caused by the physical and chemical properties and mechanical properties of rubber gradually deteriorated, and finally lose value, this kind of change is called aging of rubber. The surface is characterized by crazing, sticking, hardening, softening, powdering, discoloration, mildew, etc..
