LOK

LOK (az nem. lack – nakhustmanba), mahluli moddahoe, ki plyonka hosil mekunand. L. baroi ruypushi tunuk va shaffof, inchunin tayyor namudani ranghoi emali kor farmuda meshavad. L. tarikhi qadima dorad. Mas., dar hazorai duyumi to milod dar Hitoy az shirai darakhti Rhus verniciflua va chand asr muqaddam to milod dar Misr dar asosi kahrabo L. tayyor karda meshud. L.-ho vobasta ba navi plyonkae, ki hosil mekunand, bitumi, ravgani, alkidi, poliuretani, epoksidi, poliefiri va g. meshavand.
L. dar atseton, uaytspirt, metilatsetat, butilatsetat, etilatsetat, skipidar, khlorbenzol, ksilol, toluol, stirol va g. hal meshavad. Va mahz in guna halkunandaho hangomi saru kor giriftan bo onho boisi zahroludi shuda metavonand. Zahroludi az chunin moddaho shadid va muzmin meshavad. Padidahoi zahroludi gunogun meboshand. Mas., hangomi zahroludi az spirti metil va trikhloretilen silsilai asabi markazi oseb meyobad; zahroludi az benzol va toluol boisi zarar didani khun va uzvhoi khunofar meshavad. Dar natijai ba pusti badan rasidani L. on khorishu suzish mekunad, durusht shuda mekafad.
Bo maqsadi peshgirii zahroludi dar tarkibi L. boyad moddahoi ziyonovar kam karda shavand. Joi korro hamesha shamol doda, az liboshoi makhsus, protivogaz, respirator, aynak va g. istifoda burdan lozim ast. Dar chunin korgohho istemoli gizo man ast. Zanhoi homilaro baroi kor bo L. roh namedihand.