Gusaba
Gukoresha Amazi Ashingiye Kurengera Ibidukikije Kurinda Ibiryo
Iterambere ryiterambere hamwe niterambere ryamazi yo mu mazi
Wino ishingiye kumazi yitwa wino ishingiye kumazi mugihe gito.Irangi ryamazi ya flexographic nayo yitwa wino y'amazi.Igizwe ahanini na resin-soluble resin, pigment organic, solvent hamwe ninyongeramusaruro zijyanye no gusya.Amazi yo mu bwoko bwa resin ni ubwoko bushya bwa sisitemu ikoresha amazi aho gukoresha ibimera nkibikoresho byo gukwirakwiza.Ihujwe namazi kugirango ibe igisubizo.Amazi amaze guhindagurika, hakorwa ibikoresho bya firime.Amazi ashingiye kumazi ntabwo ashingiye kumazi ubwayo ahubwo ni firime ya firime yabonetse nyuma yo guhindagurika kwamazi.Polyurethane yo mu mazi, nkuyihagarariye, irashobora gukoreshwa cyane mubitambaro, ibifatika, ibitambaro byo kwambara hamwe nibikoresho byo kurangiza, ibikoresho byo kurangiza uruhu, imiti yo kuvura impapuro hamwe nibikoresho byo kuvura fibre.Irangi rishingiye ku mazi rirakwiriye cyane cyane mu biribwa, ibinyobwa, ubuvuzi, itabi, vino, ibikinisho by'abana n'ibindi bipfunyika no gucapa ibicuruzwa bisabwa kugira isuku, bigasimbuza ibicuruzwa bishingiye ku mashanyarazi mu bice bitandukanye.Nka kimwe mubintu bitanu byo gucapa, wino ishingiye kumazi igira uruhare runini mugucapura no gucapa neza.Kugabura neza kwino ni ihuriro ryingenzi kugirango hamenyekane ubuziranenge bwibicuruzwa byacapwe.Irangi rishingiye ku mazi ryagize uruhare runini mu icapiro rya flexografiya kubera ibyiza byo kurengera ibidukikije n'ubukungu.
Iterambere rikomeye ryinganda zicapura icyatsi bizabura byanze bikunze irushanwa mumasoko ya offset yo gucapa.Noneho abakora wino bohereje ikimenyetso cyuko igiciro cyibikoresho fatizo bya wino cyazamutse cyane, bizarushaho kongera ibiciro byumusaruro no gutunganya neza.Ibi ahanini biterwa no kubura kwisi yose yuruhererekane rwibikoresho bya shimi, aribyo bikoresho fatizo byingenzi mugukora wino.Kugeza ubu, izamuka ry’ibiciro bya peteroli n’ibikomoka kuri peteroli n’impamvu nyamukuru yo kuzamura ibiciro bya wino.Nubwo, nubwo igiciro cya peteroli cyagabanutse, kubera ko inganda za wino zibasiwe n’ibura ry’ibikoresho fatizo by’imiti, cyane cyane ibikoresho fatizo nka nitrocellulose, acide acrylic, acide acike na dioxyde ya titanium, igiciro cya wino kizakomeza kuzamuka gusa.Kugeza ubu, ibihugu n’uturere byateye imbere biragerageza kwiteza imbere no gukoresha wino kugirango bisimbuze buhoro buhoro wino ishingiye.Gupakira ibicuruzwa hamwe namazi ashingiye kumazi nkikintu nyamukuru cyiterambere cyagize icyerekezo mwisi.
Imiterere Ibiranga Inkunga ishingiye kumazi: Itandukaniro hagati ya Agent na Inkingi ishingiye kumavuta
Ubwiza bwa polyurethane kuri wino bukoresha cyane cyane alifatique polyester na aliphatic isocyanate nkibikoresho nyamukuru byubukorikori mugutegura.Ugereranije na poliurethane ya aromatic, iyambere ifite optique ihagaze neza kandi firime nyuma yo gukora firime ifite irwanya umuhondo.Hariho amatsinda ya polar nka karbamate, urethane, ester bond hamwe na ether mugace ka polyurethane ya molekulari yumunyururu wa wino, ikora imigozi ya hydrogène hamwe nitsinda rya polar hejuru yubutaka butandukanye bwimiterere nkibikoko na PA, bityo bikagira ubumwe hamwe imbaraga zihuza.Nyuma ya resin ya polyurethane yahinduwe ikozwe muri wino, irashobora gucapishwa hejuru yububiko bwa plastike ya polarike hamwe nubwihuta bwihuse.Polyurethane resin ya wino isanzwe itegurwa kuva polyester cyangwa polyether polyol, ester ring diisocyanate hamwe no kwagura urunigi rwa diamine.Bitewe no kwinjiza urea muri resin ya polyurethane, hashyizweho polyurethane urea resin (PUU), ifite amazi meza kandi ikwirakwiza pigment.
Amababi ya polyurethane kuri wino afite aho ahurira neza na aldehyde ketone resin, chloroacetic resin, nibindi birashobora kongerwaho neza muburyo bwimikorere ukurikije uko ibintu bimeze kugirango tunoze imikorere yuzuye ya wino.Amababi ya polyurethane ya wino ategurwa no kwinjiza itsinda rya urea mubice gakondo bya polyurethane ya molekile, bitezimbere cyane imbaraga zo guhuza hamwe na firime bigize imitungo ya resin ubwayo.Gakondo polyurethane resin ifite uburyo butandukanye bwo kutamenya neza hamwe na solge organic.Nyamara, mugikorwa cyo gutegura wino, kugirango uhindure amazi nubwiza bwa wino, birakenewe kongeramo umusemburo wa alcool, bizagabanya cyane ituze ryimikorere ya resin kandi bitere imivurungano, imvura yimvura nibindi bintu gakondo polyurethane.Mu gice cya molekuline igice cya polyurethane resin yo gucapa wino, kubera ko hari itsinda rya urea, resin ya polyurethane na alcool birashobora gushonga.Ariko, twakagombye kumenya ko umusemburo wa alcool ukiri umusemburo wa pseudo.Muri microscopique, umusemburo wa alcool ukubiyemo gusa molekile ya polyurethane resin, aho kugirango yinjire muri polarike ya molekile nka molekile nyayo, kuburyo wino yateguwe na resin ya polyurethane ifite amazi meza.
Itandukaniro nyamukuru hagati ya wino ishingiye kumazi na wino ishingiye kumavuta nigishishwa.Irangi rishingiye ku mazi rikoresha amazi (45% - 50%) nk'igishishwa, gifite VOC nke cyane kandi ihumanya ibidukikije;Irangi ryamavuta rikoresha ibishishwa (toluene, xylene, inzoga zinganda, nibindi) nkibishishwa.Irangi rishingiye ku mazi rikoresha amazi n’ibishishwa byamazi nkibice byingenzi bigize ibara ryashonze;Hariho kandi irangi ryirangi hamwe na wino ya pigment muri wino ishingiye kumazi, kandi pH muri rusange ntaho ibogamiye;Amavuta afite kandi irangi ryirangi hamwe na wino ya pigment, kandi pH muri rusange ni acide.Irangi ryamazi hamwe na wino ishingiye kumavuta ntibishobora kuvangwa mumutwe umwe wanditse.
Muri wino ishingiye kumazi, resin ishingiye kumazi nikintu cyingenzi cyino ishingiye kumazi.Irangi rihuza ibikoresho bigira ingaruka kumikorere ya adhesion, umuvuduko wumye, imikorere irwanya ububi nubushyuhe bwa wino, kandi bigira ingaruka kumikorere ya gloss na wino.Kubwibyo, guhitamo amazi meza ashingiye kumazi nurufunguzo rwo gutegura wino ishingiye kumazi.Igomba kuba ifitanye isano n’amabara, kwihuta cyane nyuma yo gucapa no gushinga firime, kwambara birwanya, kurwanya ubushyuhe, kurwanya ubushyuhe bwiza, guhuza byoroshye no gukora firime.Ibisigarira bikoreshwa mumazi harimo polyurethane resin, resin acrylic resin, inzoga za polyvinyl na epoxy resin.
Amazi ya polyurethane yo mumazi akwirakwizwa mumazi yinjiza amatsinda ya hydrophilique mumurongo wa polyurethane.Amazi ya polyurethane yamazi afite ibyiza byo gukoresha byoroshye, imikorere ihamye, gufatana gukomeye, ububengerane bwinshi no kurwanya ubushyuhe bwiza.Irashobora kuba muburyo butandukanye bwo gucapa, cyane cyane mugucapisha ecran, agasanduku gapakira plastike hamwe na firime.
