Hoʻomaʻemaʻe i ka Hydroxyethyl cellulose

Hydroxyethyl cellulose(HEC) he polymer hiki ke hoʻoheheʻe ʻia i ka wai i hoʻohana nui ʻia i nā ʻoihana like ʻole e like me nā lāʻau lapaʻau, nā mea hoʻonaninani, a me nā meaʻai. Loaʻa ʻia ka HEC mai ka cellulose, kahi polymer kūlohelohe i loaʻa i nā mea kanu, a hoʻololi ʻia me nā hui hydroxyethyl e hoʻomaikaʻi ai i kona hoʻoheheʻe wai a me nā waiwai ʻē aʻe.

ʻO ka hoʻomaʻemaʻe ʻana o HEC e pili ana i nā ʻanuʻu he nui e hoʻomaʻemaʻe a hoʻololi i ka polymer e hoʻokō i nā koi kikoʻī no ka hoʻohana ʻana. Eia kekahi mau hana maʻamau i ka hoʻomaʻemaʻe ʻana o HEC:

1. Hoʻomaʻemaʻe: ʻO ka hana mua i ka hoʻomaʻemaʻe ʻana o HEC ʻo ia ka hoʻomaʻemaʻe ʻana i ka cellulose raw material. Hoʻopili kēia i ka wehe ʻana i nā haumia e like me ka lignin, hemicellulose, a me nā mea haumia ʻē aʻe e hiki ke hoʻopilikia i ka maikaʻi a me nā waiwai o ka huahana hope. Hiki ke hoʻomaʻemaʻe ʻia ma o nā ʻano like ʻole e like me ka holoi ʻana, bleaching, a me ka mālama enzymatic.

2. Alkalization: Ma hope o ka hoʻomaʻemaʻe ʻana, mālama ʻia ka cellulose me kahi hopena alkaline e hoʻonui ai i kona reactivity a maʻalahi i ka hoʻokomo ʻana i nā hui hydroxyethyl. Hoʻohana pinepine ʻia ka Alkalization me ka sodium hydroxide a i ʻole potassium hydroxide ma nā mahana a me nā kaomi kiʻekiʻe.

3. Etherification: ʻO ka hana aʻe ka hoʻokomo ʻana i nā pūʻulu hydroxyethyl ma luna o ka iwi kuamoʻo cellulose. Hana ʻia kēia ma o ka etherification, e pili ana i ka hana ʻana i ka cellulose me ka ethylene oxide i mua o kahi catalyst alkaline. Hiki ke ho'omalu 'ia ka degere o ka etherification e ho'okō i nā waiwai i makemake 'ia e like me ka viscosity, solubility, a me ka thermal stability.

4. Neutralization: Ma hope o ka etherification, hoʻokaʻawale ʻia ka huahana no ka wehe ʻana i ke koena alkali a hoʻoponopono i ka pH i kahi pae kūpono no ka hoʻohana ʻana. Hiki ke hana ʻia ka neutralization me kahi waikawa e like me ka acetic acid a i ʻole ka waikawa citric.

5. ʻO ka kānana a me ka maloʻo: ʻO ka hana hope loa ka kānana a me ka maloʻo ʻana o ka huahana HEC i hoʻomaʻemaʻe ʻia. Hoʻopili pinepine ʻia ka huahana no ka wehe ʻana i nā mea haumia i koe a laila maloʻo i kahi ʻoluʻolu kūpono no ka mālama ʻana a me ka lawe ʻana.

Ma keʻano holoʻokoʻa, ʻo ka hoʻomaʻemaʻe ʻana o HEC e pili ana i nā ʻanuʻu e hoʻomaʻemaʻe a hoʻololi i ka cellulose maka mea e hana ai i kahi polymer kiʻekiʻe, wai-soluble me nā waiwai kikoʻī no ka hoʻohana ʻana.