RANGREZI

RANGREZI, majmui prosesshot fiziki va khimiyaviest, ki dar natijai on ashyoi bofandagi, kogaz, pust, plastmassa va gayra ba khud rangi muayyane girifta, ba tasiri rushnoi, ob, soish ba andozae ustuvor meshavand. Dar Rangrezi rangvoriho, lok, pigmentkho va gayraro ba kor mebarand.

Ashyoi bofandagiro beshtar bo hapopati baland dar mahluli rangvori­ho yo suspenziyai onho rang meku­nand. Usulhoi Rangreziro vobasta ba khususiyathoi rangvoriho va ashyoi rangshavanda muayyan mekunand. Na­khi rastani, nakhi pashmina va nakhi sintetikii polimidiro dar madhluli obakii namaki oshdori rang vorido rang menamoyand. Sipas  ashyoro bo namaki metallho yo prepa­rathoi makhsus kor mekunand, ki dar natija rangi onho nameparidagi meshavad. Rangrezi tavassuti rangvorihoi faol dar natijai tasiri khimiyavii baynihamdigarii onho bo nakhi rastani, nakhi pashmina va sintezi ba amal barovarda meshavad. Rangrezii nakhhoi rastani dar muhiti ishqori nakhi pashmina dar muhiti neytrali yo muhiti kislotagiash sust ijro karda meshavad. Rangvorihoi dar ob halshavandaro hangomi rang kardani nakhhoi rastani va sintetiki ba kor mebarand. Avval ashyoro ba mahluli ishqorii payvasthoi azotoli , bad bo mahluli khunuki namakhoi diazoniya kor mekunand. Dar natija ranghoi balandu ustuvori tobishhoi gunogundoshta hosil megardand. Bo rangvorihoi sulfurdor rang kardani nakhhoi rastani dar mahluli sulfidi natriy guzaronida meshavad. Leykopayvasthoi dar nakh hosilshuda bo oksigeni havo oksid gashta ba ashyo rang medihand. Nakhhoi suni va sintetikiro pesh az residan yo bad rang mekunand. Kogazro bo yakchand usul: ba massai kogaz rangvorihoi minerali yo sintetiki hamroh karda, kogazi tayyorro ba mahluli kislotagii rangvoriho meandozand yo rui onro bo sathi moddahoi rangvori mepushand. Rang kardani plastmassa ba tarzi

Ho­sil kardan va khususiyathoi on vobasta meboshad. Masalan, ba plastmassahoi polimerizatsioni pesh az po­limerizatsiya rangvori hamrokh mekunand. Ba plastmassahoi kondensatsioni boshad, hangomi istehsoli khokaho, hamrohi purkunandaho rangvori meandozand. Nig. niz Alizarin.

Ad.: Androsov V. F., F e l V. S., Krashenie sinteticheskikh volokon, M., 1965; Melnikov B. N., M o r i g a nov P. V., Teoriya i praktika inten­sifikasii prosessov krasheniya, M., 1969.