[Application of isocyanate separating agent for acrylic resin].
The most widely used agents for separating acrylic resin from gypsum molds are the water-soluble alginates, which produce a very thin water- and organic solvent-insoluble calcium alginate film on the gypsum surface. In the present study, a new type of separating agent, an isocyanate type coating agent, was developed and it's properties were investigated. This coating agent is composed mainly of trimethylol-propane-tolylenediisocyanate and ethyl-acetate, with a small amount of bis-tributyl-tin oxide as catalyst. At first, a thin film was formed on the surface by application of the agent, and then alkyl-phosphate was applied to this film to ensure easy separation of the cured resins from the molds. The molds treated with this separating agent had a glossy, hard surface. The surface of the cured resins treated in this way was glossier and smoother than that of resin treated with the water-soluble alginates.
Takahashi
Y
Y
Ban
S
S
Tanase
H
H
Iwai
M
M
Hasegawa
J
J
Kimoto
M
M
Uchida
S
S
D000180:Acrylic Resins / Q000737:chemistry*; D002133:Calcium Sulfate; D003735:Dental Casting Technique; D011407:Propane; D013499:Surface Properties; D014051:Toluene 2,4-Diisocyanate / Q000737:chemistry*
D000180:Acrylic Resins; D014051:Toluene 2,4-Diisocyanate; D011407:Propane; D002133:Calcium Sulfate