Antidegradants waxes

Uses Antioxidant, stabilizer for plastics (polyamide, ABS, PP, POM, PU, PVC, PS), food-grade polymers, rubber, latex, adhesives, sol n. and emulsion polymers, cellulosics, fats, oils, and paraffin wax polymerization Inhibitor In chemical processes antidegradant for polyolefins and coatings antioxidant in food-contact rubber articles for repeated use in food-pkg. adhesives... 

Antidegradants including waxes, antiozonants, antioxidants, and prevulcanisation inhibitors are also necessary for good processability and performance of rubbery parts. Unfortunately, these materials are also had for adhesion because they can also migrate to the rubber surface and interfere with crosshridging reactions. The lowest possible amount of these materials necessary to get acceptable part performance without causing blooming to the surface of the rubber is preferred. 

It should be noted that TGA will not always be accurate because various components in polymeric formulations are not observed as independent weight loss in TG curves (e.g. sulfur, accelerators, antioxidants and antidegradants in elastomers) and may undergo weight loss over a large temperature range. Low-MW volatile products (e.g. oils, waxes, plasticisers and resins) tend to overlap with polymer decomposition for most choices of method parameters. In the presence of multiple decomposition... 

Mixtures of butadiene-styrene copolymer (or polybutadiene) with natural rubber are often mixed with low molecular weight paraffin wax (C H2 + 2) in fire applications. The rubber components maintain their near miscibility. The paraffin wax however precipitates out and migrates to the air interface and acts as an antidegradent layer [21]. 

Antidegradents. This group of chemicals is added to prevent undesirable chemical reactions with the polymer network. The most important are the antioxidants, which trap free radicals and prevent chain scission and cross-linking. Antiozonants are added to prevent ozone attack on the rubber, which can lead to the formation and growth of cracks. Antiozonants function by diffusion of the material to the surface of the rubber, thereby providing a protective film. Certain antioxidants have this characteristic, and waxes also are used for this purpose. 

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