Carbinol Resins

synthetic polymers, copolymerization products of dimethylvinylethynyl carbinol CH2=CH—C≡C—C(CH₃)₂—OH with butyl and/or methyl methacrylate in particular. Carbinol resins serve as the base for the preparation of carbinol varnishes and glues.

Carbinol varnishes are colorless or colored solutions of carbinol resins in ethyl Cellosolve and/or ethyl alcohol. The dry varnish residue constitutes 23–45 percent, and the drying time at 20°C is 30–90 minutes. Colorless varnishes are used for varnishing polychromatic printing products to improve their external appearance, durability, and water resistance. Colored varnishes (basic blue K dye) are used in noncopying paper reproduction (photocopying) for lacquering pencil drawings on tracing paper.

Carbinol glues are prepared from a carbinol resin base containing a filler (Portland cement) and a solvent (acetone). The shelf life of carbinol glue is 1–2.5 hr at a temperature of 5°-10°C and without exposure to direct sunlight. It is used to glue together metals, ceramics, and plastics at room temperature (aging 20–24 hr) or at 60°-70°C (aging 6–8 hr); the excess pressure during the gluing process is not less than 50 kilonewtons per square meter, or 0.5 kilogram force per square centimeter. The adhesive compound exhibits good shear strength.