| 摘要 |
FIELD: polymer production. ^ SUBSTANCE: alkyd-siloxane resin is prepared via interaction of alkyd resin with polyorganosiloxane on heating. Method is distinguished by that polyorganosiloxane is notably polyphenylethoxysiloxane with weight proportion of ethoxy groups 17-40%, which is first treated with butyl alcohol at 130-150°C for 1-2 h until content of ethoxy groups achieves 10-13%, after which resulting modifier is brought into cocondensation with low-viscosity alkyd resin having acid number 5-15 mg KOH/g and viscosity of its 60% xylene solution 40-60 s at 160-170 and alkyd resin-to-modifier ratio (65-85):(20-35). Alkyd resin utilized is based on vegetable oils, pentaerythritol, and phthalic anhydride. ^ EFFECT: reduced increase in viscosity of alkyd-siloxane resin and enhanced protective properties of coatings based on this resin. ^ 2 tbl, 5 ex
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