Idayi yi-organic compound, ngokufuthi phambi kweemeko zolwelo ukugqiba ukusabela kwemichiza, ngoko ke idayi yokuqala yehlabathi yokwenziwa ithengiswa kuqala kwimo yolwelo, ngokuqinisekileyo, umgangatho wedayi wokuqala kunye nomlinganiselo wangoku ukude, unako kuphela. kuthathwa njengeyona ndlela yoqobo yedayi elulwelo namhlanje.Ngelo xesha, malunga ne-20% yezinto ezithengiswayo zazilulwelo, kwaye ezi dayi zolwelo zaziyidayi yeVAT kunye nedayi emdaka.

Ngowe-1923, amaBhritani aqala ukongeza izinto ezikhethiweyo kwidayi yokuqala kwaye emva kokusila, yenza ukuba i-insoluble disperse idayi i-aqueous dispersion.

Ngokutsho kweencwadi ze-1924, ngelo xesha malunga ne-80% yokuguqulwa kwedayi ibe ngumgubo ocolekileyo, idayi ye-VAT yenziwe kuluhlu olubanzi lokusabalalisa ubungakanani bamasuntswana, ukusuka kwizinto ezintle kakhulu ukuya kwi-50um yempahla yedayi yomgubo. yothuli olunzima kunye nokumanzisa kakubi.

Emva ko-1930, uhlobo lwedayi yokusasazwa luye lwaphuhliswa ngakumbi, kodwa kusekho ukusilela okunje ngemvula elula kunye nozinzo olungeluhle ekugcinweni kwalo.

Ngoku idayi yolwelo emva kwefomula yokucubungula ephuculweyo yeepropati ezahlukeneyo iye yaphuculwa kakhulu, ixesha lokugcina linokufikelela ngaphezu kwesiqingatha sonyaka ngaphandle kokuwohloka, iindleko zokusetyenzwa kwedayi yolwelo ziphantsi, kulula ukuyisebenzisa kwaye ziye zaphuhliswa rhoqo.

Ukususela ngo-1950, ukuvela komatshini we-sanding kuye kwakhuthaza ukuphuhliswa kweteknoloji emva kokunyanga.Ukugaya okumanzi ngomatshini we-sanding kunokufumana iincinci ezincinci kunye nezincinci.Ngaphezu koko, i-formula yokucubungula yaphuculwa ukuze iinqununu ezisisiseko zedayi zifikelele malunga ne-1um, kwaye umgangatho weemveliso eziveliswa yinkqubo entsha kunye nezixhobo ziphuculwe kakhulu, kunye nokulungiswa kwedayi ezinganyibilikiyo kwenza inkqubela enkulu.

Ngokuhamba koomatshini bemichiza kunye nezixhobo zemichiza, idayi yegranular yaqala ukubonakala. i-drawback yedayi yedayi yothuli idada esibhakabhakeni, iifom zedosi zavela ngokukhawuleza zamkelwa lisebe lemveliso kunye nokusetyenziswa, ngoku iidayi ezininzi zicutshungulwa kwiimveliso zegranular.