The Use of Poly(Metal Phosphinates) as Antistatic Coatings, Multipurpose Fluid Thickeners, and Thermally Stable Coatings

摘要

Water-repellant and transparent plasticized poly(metal phosphinate) compositions were developed for antistatic coatings on polyethylene. Coatings based on Cr(H2O) (OH) (OPBu2O)2, Cr(H2O) (OH) (OP(Me) (Ph)O)2, Cr(H2O) (OH)(OPPh2O)2, and TiO(OPPh2O)2 all dissipated a 5 kV positive charge in one second or less. Coatings based on TiO(OPPh2O)2 also dissipated a 5 kV negative charge in one second or less and were essentially not tacky. The tris(phosphinate) Cr(OP(C8H17)2O)(OP(Me)(Ph)O)2 prepared in situ was found to be an effective thickener for a variety of lubricant fluids in the 5-14% concentration range. A thickener with substantially greater thermal stability was prepared by the reaction of Cr(H2O) (OH)(OP(Me)(Ph)O)2 with Me(Ph)P(O)OH. Greases made from DC550 and these thickeners exhibit drop points generally above 600F. and good antiwear properties; however, their bearing performance is limited. Coatings of Cr(OP(C8H17)2O)(OP(Me)(Ph)O)2 pigmented with TiO2 adhere well to cold-rolled 1010 steel and exhibit good hardness and resistance to jet oil or water. They can tolerate 250C. in air for one hour but degrade at 300C. The use of more stable chromium(III) tris(phosphinates), i.e., tris(phosphinates) containing no alkyl groups other than methyl, for coatings was briefly explored. (Author)