Hypalon elastomer

Chem. Descrip. Tributyl phosphate CAS 126-73-8 EINECS/ELINCS 204-800-2 Uses Plasticizer for CR, CPE, Hypalon elastomers, PVC, PVAc, cellulo-sics, PS, ABS, ink systems lubricant additive antioxidant for cellulo-sics, nylon, polyester, PP, PVC antifoam ink solvent paints/coatinqs additive... 

Acrawax C 1,4-Cyclohexanedimethanol dIbenzoate, Multiwax 180-M plasticizer, Hypalon elastomers Albrlte TBP plasticizer, HR Sylvaros DR-22... 

Figures 8-26 and 8-27 show several types of air-supported structures. Figure 8-26 shows a simple arch section with spherical sections ends. The perimeter of structures, frequently made of such materials as chlorosulfonated polyethylene (Hypalon elastomer) coated on nylon...

CSPE. Chlorosulfonated polyethylene (CSPE), a synthetic mbber manufactured by DuPont, is marketed under the name Hypalon. It can be produced as a self-curing elastomer designed to cure on the roof. The membrane is typically reinforced with polyester and is available in finished thicknesses of 0.75 to 1.5 mm. Because CSPE exhibits thermoplastic characteristics before it cures, it offers heat-weldable seams. After exposure on the roof, the membrane cures offering the toughness and mechanical set of a thermoset. The normal shelf life of the membrane for maintaining this thermoplastic characteristic is approximately six months. After the membrane is fully cured in the field, conventional adhesives are needed to make repairs. 

It is estimated that 27,000 t/yr of CSM have been commercially used in the United States. However, due to environmental problems in the manufacturing process, it has been necessary to develop a process that is much mote expensive. As a result many companies using CSM ate trying to replace the CSM with CPE or other elastomers. The result is a decline in the usage of this polymer. Chlorosulfonated polyethylene is sold under the trade name Hypalon (DuPont—Dow Company). 

When polyethylene is chlorinated in the presence of sulphur dioxide, sulphonyl chloride as well as chlorine groups may be incorporated into the polymer Figure 10.10). This reaction is used to produce a useful elastomer (Hypalon, see Chapter 11). 

An elastomer made by substituting chlorine and sulphonyl chloride groups into polyethylene. The material is best known by the trade name Hypalon, which is the DuPont trade mark for their brand of chlorosulphonated polyethylene. 

The EVAs make it possible to produce compounds with high filler levels and are compatible with many elastomers, plastics and other materials SBR, butyl rubber, EPDM, nitrile rubber, Hypalon, thermoplastic elastomers, epoxies, PVC, PVDC, bitumen. 

E I du Pont Nemours Co Elastomer Chemicals Dept, Wilmington Delaware, USA, R M Murray and D C Thompson, The Neoprenes, Formal Reports-Basic Principles of Compounding, Informal reports-Basic Details of Compounding and Test data, Hypalon Reports, Viton Bulletins, Adiprene Bulletins and Extensive reports on various Specialty Rubbers. 

Hypalon 20 - [COATED FABRICS] (Vol 6) - [SULFURIC ACID AND SULFUR TRIOXIDE] (Vol 23) -ethylene glycol compatibility [ANTIFREEZES AND DEICING FLUIDES] (Vol 3) - [ELASTOMERS,SYNTHETIC - CITLOROSULFONATED POLYETHYLENE] (Vol 8)... 

The first step in preparing the very useful elastomer Hypalon involves treating a mixture of long-chain alkanes, H(CH2) H, where n =50-200, with sulfuryl chloride (S02C 2) in the presence of substances that can initiate radical-chain chlorination, as described in Section 4-5B. The product molecules contain many C-CI bonds and a few C-S02-Cl bonds, the latter of which are subsequently used in a curing step to improve the physical properties. How can the chain mechanism for chlorination with S02CI2 be modified to account for the formation of C-S02-Cl bonds ... 

Many different synthetic elastomers are also compounded and calendered to form sheet lining materials. Examples are neoprene, Hypalon, butyl and chlor-butyl rubber. 

A second family of ionic elastomers based on the sulfonation of chlorinated polyethylene was also introduced in the early 1950 s by E. I. du Pont de Nemours Co., Inc. Curing these materials with various metal oxides gives rise to a combination of ionic and covalent crosslinks, and these elastomers are commercially available under the trade name Hypalon. 

Butyl rubber like Hypalon, Neoprene or nitrile rubber is a speciality polymer which can be compounded for a soft, deformable elastic vulcanisate similar to the other elastomers, but having certain distinctive characteristics, like low permeability to all gases and resistance to ageing and ozone cracking. Butyl has poor oil resistance and medium low temperature flexibility. 

C.B. McCartan, Tank Linings Made of Synthetic Elastomers - Neoprenes and Hypalon, El Dupont Nemours St Co.,Wilmington, DE, USA. 

Table I-V shows the compounding receipt of the samples used in this study.In th etable phr means pers per hundred resin (rubber). The thickness of the samples was about 0.5 mm. EPDM-3, 4, 5, 6 and 7 are the series of the compounding formula of the curing by low sulfur. EPDM-2 contains the relatively higher sulfur with Hypalon (Chlorosulphonated polyethylene) that increases tensile strength of elastomer. EPDM-1, 8 and 10 were crosslinked by peroxide. Triallyl isocyanurate in EPDM-1 is a multi-functional compound that increases the concentration of network.

Elastomer Natural rubber Butyl rubber Chlorinated Butyl Rubber Nitrile rubber Silicone rubber Hypalon Chloroprene Viton EPDM EVA... 

---