A wide variety of synthetic rubbers are known, some of which have better mechanical properties than natural rubber. Buna 85″ is formed by polymerization of butadiene, “neoprene” by polymerization of chloroprene, “perbunan N” from butadiene and vinyl cyanide, “buna S” from butadiene and styrene, “buna S” from butadiene and styrene, and many others of more or less known and patented composition with names unrelated to the monomers of butadiene and styrene, as well as many others of more or less known composition and patented under names that bear no relation to the monomers of which they are composed (“ameripol”, “koroseal”, “thincol”, “chemigum”, etc.). ).
Natural rubber illustrates the structural requirements of an elastomer; long, flexible chains; weak intermolecular forces and occasional intermolecular bonds. Rubber is cis-1,4-polyisoprene. Having no strongly polar substituents, intermolecular attraction is limited to Van Der Waals forces, which are weak due to the cis-configuration of all double bonds. The figure below compares the extended chains of rubber with that of its trans isomer. We note that the trans configuration allows very regularly zigzagging extended chains that can join well together, which is not possible for the cis configuration. The fully trans stereoisomer is found in nature in the form of gutta-percha; it is highly crystalline and lacks elasticity.
Natural latex is a colloidal aqueous suspension composed of some fats, waxes and various gummy resins obtained from the cytoplasm of the latiferous cells present in some angiosperm plants and fungi. It is frequently white, although it can also present orange, reddish or yellowish tones depending on the species, and of milky appearance. The latex of certain plants is toxic and poisonous, such as the cardoon.
The latex of certain plants is toxic and poisonous, such as that of the cardon (Euphorbia canariensis), which is used to hunt fish, or that of Calotropis gigantea, which the natives of southern Asia use to poison the tips of their arrows. On other occasions it is sweet and edible, such as that produced by the milk tree, or extremely pungent and irritating, as in the case of the fig tree (Ficus carica).
Most of the latex used commercially is extracted from the syringa (Hevea brasiliensis) and is used to obtain rubber. However, there are also other products derived from natural latex such as gutta percha (yellow or brownish material produced from the latex of Palaquium gutta), balata (a hard material very similar to rubber obtained mainly from the latex of Manilkara bidentata) and chicle (a pinkish or brownish substance extracted from the latex of Manilkara zapota) that are of great commercial importance. The following are also commercially important.
Natural Latex for sale
Since it is a natural product that comes from the hevea brasiliensis tree, it degrades more easily in environmental conditions. The ideal use is the tying of fresh vegetables such as lettuce, asparagus bundles, spring onions…since they are perishable foodstuffs.
Other applications of synthetic rubber bands are in marine farming (aquaculture) for the fastening of oyster and mussel pots, for example, as they withstand the salinity and strength of the tides very well.
Synthetic rubber bands, which are latex-free bands, are necessary in the health sector, as they avoid the risk of skin allergies. They are used in face masks, face shields, tourniquets for blood collection, etc.
A variety of synthetic rubbers are silicone rubbers, which offer a perfect hold in cases where good performance at high temperatures and longevity are required. For example, in seafood cooking, where silicone rubber bands hold the legs, or in ceramics, where they can be used to hold pieces that pass through ovens at extreme temperatures.
Natural latex price
At the end of the notch a chute is made, with underneath a container or bucket, so that the latex rubber is collected drop by drop and then can be collected by the taps and then processed into the latex-rubber product that we offer as fashion fabrics in our latex store for making latex clothing and latex lingerie, among other things.
By heating natural rubber latex with sulfur (vulcanization), a substance with better properties is created. The higher the percentage of sulfur, the harder the rubber (latex). Latex is a suspension of many hundreds of natural polymer particles. Liquid natural latex rubber is highly elastic and of high quality.