Scorch protection

Table 4 (16) makes a comparison of cure properties for the sulfenamides listed in Tables 1 and 2 relative to MBS. No exact replacements are available for MBS, MBSS, and DIBS, but DCBS can serve as an alternative for MBS and DIBS and CBS and TBBS can serve as alternatives for MBSS. Proper adjustments in sulfur and sulfenamide levels can provide similar cure performance. CBS and TBBS also satisfy the need in providing rapid curing kinetics where required. Additional scorch protection, if needed, can be obtained by application of the widely used scorch inhibitor A(-(cyclohexylthio)phthalimide (17). 

They are free flowing, 100% reactive solids, and can be readily compounded with a variety of rubbers. Additional characteristics include low odour, scorch protection... 

The requirements of flexible polyurethane slabstock foam manufachirers vary due to sensitivity to antioxidant volatility, preference in physical form (liquid or sohd), and degree of anti-scorch protection. As a result of this broad variation in antioxidant performance demands, several alternative antioxidants to BHT are available. AO-2 and AO-3 combine relatively low volatility and good anti-scorch performance with the advantage of a liquid product form. AO-4 and AO-5 have significantly lower volatility than BHT and improved performance. Addition of peroxide scavengers such as DTDTDP and PHOS-1 can further enhance the scorch resistance of the polyurethane foam. 

Two other organic peroxides that are (a distant) third and fourth in volume of use in rubber are 2,5-dimethyl-2,5-di-(f-butylperoxy)hexane and 2,5-dimethyl-2,5-di-(fert-butylperoxy)hexyne-3. Both of these organic peroxides (in volume) have some relative advantages in imparting better scorch protection. Also, both of these two organic... 

When the U.S. was preparing to invade Iraq, there was great concern that our soldiers would be exposed to nerve agents. They were required not only to mask, but also to wear full body protective suits despite scorching temperatures. To me, this is overkill. The suits are extremely uncomfortable, and studies have shown that they hinder military performance by 40-50%. 

High up in the atmosphere, around 20 km from the surface of the earth, the ozone layer acts as a shield and protects the earth from the harmful UV rays present in the incoming solar radiation. But for this layer, all life on earth would have been scorched. Ozone is used to sterilize drinking water and to remove bad odours and tastes. 

Placed over rows of eool-season crops, shade cloth protects them from the scorching rays of the summer sun. It effectively extends the season for plants that normally prefer spring or fall temperatures. 

Bordeaux mixture, in spite of having solved several problems in plant protection at the end of the nineteenth century and at the beginning of the twentieth, has many disadvantageous properties. Its action is not uniform, but depends on the coppier-calcium ratio and on the mode of preparation. Since it is corrosive it cannot be stored in iron or steel containers. Moreover it is incompatible with other pesticides, it scorches the more sensitive plants, and its preparation is elaborate. Thus its use is restricted. Finally, it must be used immediately after its preparation because it crystallises on standing, converting into calcium cuprite, so that its fungicidal action is considerably reduced (Burchfield and Schechtman, 1955). 

Acrylic acid, zinc salt Ageflex ZDA EINECS 238-692-3 2-Propenoic acid, zinc salt Zinc acrylate Zinc dlacrylate. Crosslinker for molded polybutadiene compounds, conductive and protective coatings, coagent for SBR compounds and reactive pigments activator for rubber compounding scorch retarder. Rit-Chem. 

Dark, moist (but not wet) living conditions, at a fairly constant temperature. Keep them out of scorching heat in the summer, and protected from frost during winter (for example, with an insulation jacket). 

Outstanding properties volatility, low viscosity, effective scorch in flexible PU foams, good protection against degradation due to heat and oxygen ... 

The standard approach to reducing scorch involves the addition of one or more antioxidants. Butylated hydroxytoluene (BFIT, see Appendix 1) has been the traditional foundation of the stabilization package. Phenolic antioxidants are used to protect the polyol firom oxidation during manufacture, minimize hydroperoxide formation during storage, and reduce scorch during PUR (poljoirethane) foam manufacture. The relatively high volatility of BHT can be a concern as it is easily volatilized out of... 

A unique hydrogel application actually protects the body from sun during the summer. A gel in a hat or actually in a swimwear may be used to lower body temperature by using the latent heat of water vaporization, thereby allowing one to enjoy sports under a scorching sun. A hat for golfers has already become a very popular product. 

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