Ke kaʻina hana a me ka hana o ka hydroxyethyl cellulose (HEC)

I. Hoʻolauna

ʻO Hydroxyethyl Cellulose (HEC) kahi polymer wai-soluble non-ionic i hoʻohana nui ʻia i ka unuhi ʻaila, nā uhi ʻana, ke kūkulu ʻana, nā kemika o kēlā me kēia lā, ka hana pepa a me nā ʻoihana ʻē aʻe. Loaʻa ʻo HEC ma o ka hoʻololi kemika o ka cellulose, a ʻo kona mau waiwai a me nā hoʻohana ʻana ua hoʻoholo nui ʻia e nā substituents hydroxyethyl ma nā mole cellulose.

II. Ke kaʻina hana

ʻO ke kaʻina hana o HEC e pili ana i kēia mau ʻanuʻu: cellulose etherification, holoi, dehydration, maloʻo a me ka wili ʻana. Eia kahi hoʻolauna kikoʻī i kēlā me kēia ʻanuʻu:

Ka hoʻohuihui ʻana o ka cellulose

Hoʻomaʻamaʻa mua ʻia ka Cellulose me ka alkali e hana i ka cellulose alkali (Cellulose Alkali). Hoʻokō pinepine ʻia kēia kaʻina hana i loko o kahi reactor, me ka hoʻohana ʻana i ka hopena sodium hydroxide e mālama i ka cellulose kūlohelohe e hana i ka cellulose alkali. Penei ka hopena kemika:

Cell-OH+NaOH→Cell-O-Na+H2OCell-OH+NaOH→Cell-O-Na+H 2O

A laila, hana ka alkali cellulose me ka ethylene oxide e hana i ka hydroxyethyl cellulose. Hana ʻia ka hana ma lalo o ke kaomi kiʻekiʻe, maʻamau 30-100°C, a penei ka hana kikoʻī:

Kele-O-Na+CH2CH2O→Keʻena-O-CH2CH2OHCell-O-Na+CH 2CH 2O→Keʻena-O-CH 2CH 2OH

Pono kēia hana i ka kaohi pololei o ka mahana, ke kaomi a me ka nui o ka ethylene oxide i hoʻohui ʻia e hōʻoia i ka like a me ka maikaʻi o ka huahana.

Holoi ʻana

ʻO ka hopena o ka HEC maka he alkali i hana ʻole ʻia, ethylene oxide a me nā huahana ʻē aʻe, pono e wehe ʻia e nā holoi wai he nui a i ʻole nā ​​​​holoi wai hoʻoheheʻe organik. Pono ka nui o ka wai i ka wā o ke kaʻina holoi wai, a pono e mālama ʻia a hoʻokuʻu ʻia ka wai ʻino ma hope o ka holoi ʻana.

Ka maloʻo ʻana

Pono e hoʻomaloʻo ʻia ka HEC pulu ma hope o ka holoi ʻana, maʻamau ma o ka kānana vacuum a i ʻole ka hoʻokaʻawale centrifugal e hōʻemi i ka nui o ka makū.

Hoʻomaloʻo

Hoʻomaloʻo ʻia ka HEC maloʻo, ma ke ʻano he hoʻomaloʻo pīpī a i ʻole ka hoʻomaloʻo wikiwiki. Pono e kāohi pono ʻia ka mahana a me ka manawa i ka wā o ke kaʻina hana hoʻomaloʻo e pale aku i ka hōʻino ʻana o ke ana wela kiʻekiʻe a i ʻole ka hoʻākoakoa ʻana.

Wili ʻana

Pono e wili ʻia a kānana ʻia ka poloka HEC maloʻo e hoʻokō i kahi hoʻolaha like o ka nui o nā ʻāpana, a laila e hana i kahi huahana pauka a granular paha.

III. Nā ʻano hana

Ka hiki ke hoʻoheheʻe ʻia i ka wai

He maikaʻi ka hoʻoheheʻe ʻana o HEC i ka wai a hiki ke hoʻoheheʻe koke i ka wai anuanu a me ka wai wela e hana i kahi hopena moakaka a translucent paha. ʻO kēia waiwai solubility e hoʻohana nui ʻia ai ma ke ʻano he mea hoʻomānoanoa a me ka mea hoʻopaʻa i nā uhi a me nā huahana kemika o kēlā me kēia lā.

Mānoanoa

Hōʻike ʻo HEC i kahi hopena mānoanoa ikaika i loko o ka hopena wai, a piʻi aʻe kona mānoanoa me ka piʻi ʻana o ke kaumaha molekala. ʻO kēia waiwai mānoanoa e hiki ai iā ia ke pāʻani i kahi kuleana i ka mānoanoa, ka paʻa ʻana o ka wai a me ka hoʻomaikaʻi ʻana i ka hana kūkulu ʻana i nā uhi wai a me nā mortar hale.

ʻO ka ʻōnaehana Rheology

Loaʻa i ka wai wai HEC nā waiwai rheological kūikawā, a loli kona mānoanoa me ka loli o ka wikiwiki o ka shear, e hōʻike ana i ka lahilahi o ka shear a i ʻole pseudoplasticity. Hiki i kēia waiwai rheological ke hoʻoponopono i ka fluidity a me ka hana kūkulu ʻana i nā uhi a me nā wai ʻeli ʻaila.

Emulsification a me ka hoʻokuʻu ʻana

Loaʻa i ka HEC nā waiwai emulsification a me ka suspension maikaʻi, hiki ke hoʻopaʻa i nā ʻāpana i hoʻokuʻu ʻia a i ʻole nā ​​​​​​kulu i loko o ka ʻōnaehana hoʻopuehu e pale aku i ka stratification a me ka sedimentation. No laila, hoʻohana pinepine ʻia ʻo HEC i nā huahana e like me nā uhi emulsion a me nā suspensions lāʻau.

Ka palaho ʻana o ka ʻiole

He mea hana kūlohelohe ka HEC me ka biodegradability maikaʻi, ʻaʻohe haumia i ke kaiapuni, a hoʻokō i nā koi o ka palekana kaiapuni ʻōmaʻomaʻo.

IV. Nā Kahua Noi

Nā uhi

I loko o nā uhi wai, hoʻohana ʻia ʻo HEC ma ke ʻano he mea hoʻomānoanoa a me ka mea hoʻopaʻa e hoʻomaikaʻi i ke kahe ʻana, ka hana kūkulu ʻana a me nā waiwai anti-sagging o nā uhi.

Kūkulu ʻana

I nā mea kūkulu hale, hoʻohana ʻia ʻo HEC i loko o ka sima-based mill a me ka pauka putty e hoʻomaikaʻi i ka hana kūkulu hale a me ka paʻa ʻana o ka wai.

Nā Kemika o kēlā me kēia lā

I loko o nā detergents, shampoos, a me nā toothpastes, hoʻohana ʻia ʻo HEC ma ke ʻano he thickener a me ka stabilizer e hoʻomaikaʻi i ka manaʻo a me ke kūpaʻa o ka huahana. 

Nā kahua ʻaila

I ka ʻeli ʻana i ke kahua ʻaila a me nā wai haki, hoʻohana ʻia ʻo HEC e hoʻoponopono i ka rheology a me nā waiwai hoʻokuʻu o nā wai wili a hoʻomaikaʻi i ka pono a me ka palekana o ka wili ʻana.

Hana pepa

I ke kaʻina hana pepa, hoʻohana ʻia ʻo HEC e kāohi i ka wai o ka pulp a hoʻomaikaʻi i ke ʻano like a me nā waiwai o ka ʻili o ka pepa.

Ua hoʻohana nui ʻia ka Hydroxyethyl cellulose (HEC) ma nā ʻoihana he nui ma muli o kona solubility maikaʻi loa i ka wai, ka mānoanoa, nā waiwai rheological, nā waiwai emulsification a me nā waiwai suspension, a me ka biodegradability maikaʻi. Ua oʻo iki kāna hana hana. Ma o nā ʻanuʻu o ka cellulose etherification, ka holoi ʻana, ka dehydration, ka maloʻo ʻana a me ka wili ʻana, hiki ke hoʻomākaukau ʻia nā huahana HEC me ka hana paʻa a me ka maikaʻi maikaʻi. I ka wā e hiki mai ana, me ka hoʻomaikaʻi ʻana i nā koi palekana o ke kaiapuni a me ka holomua o ka ʻenehana, e ʻoi aku ka laulā o nā manaʻolana noi o HEC.