Kaʻina hana a me ka hana o ka hydroxyethyl cellulose (HEC)

I. Hoolauna

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

II. Kaʻina hana hana

ʻO ke kaʻina hana o HEC ka mea nui i nā pae aʻe: cellulose etherification, holoi, dehydration, maloʻo a me ka wili. Eia ka hoʻolauna kikoʻī i kēlā me kēia ʻanuʻu:

ʻO ka etherification cellulose

Hana mua ʻia ka cellulose me ka alkali e hana i ka cellulose alkali (Cellulose Alkali). Hana ʻia kēia kaʻina hana i loko o kahi reactor, me ka hoʻohana ʻana i ka solution 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. Hoʻokō ʻia ka hopena ma lalo o ke kaomi kiʻekiʻe, maʻamau 30-100°C, a penei ka hopena kikoʻī:

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

Pono kēia pane i ka mana pololei o ka mahana, ke kaomi a me ka nui o ka ethylene oxide i hoʻohui ʻia e hōʻoia i ka kūlike a me ka maikaʻi o ka huahana.

Holoi

Loaʻa i ka HEC crude ka hopena i ka alkali unreacted, ethylene oxide a me nā huahana ʻē aʻe, pono e hoʻoneʻe ʻia e nā holoi wai he nui a i ʻole ka holoi ʻana i ka wai. Pono ka wai nui i ka wā o ka holoi ʻana i ka wai, a pono e mālama ʻia a hoʻokuʻu ʻia ka wai ʻino ma hope o ka holoi ʻana.

Dehydration

Pono e hoʻomaʻemaʻe ʻia ka HEC pulu ma hope o ka holoi ʻana, ma ke ʻano maʻamau ma ka kānana ʻana a i ʻole ka hoʻokaʻawale centrifugal e hōʻemi i ka ʻoluʻolu.

Hoʻomaloʻo

Hoʻomaloʻo ʻia ka HEC dehydrated, maʻamau ma ka hoʻomaloʻo ʻana a i ʻole ka hoʻomaloʻo uila. Pono e mālama pono ʻia ka mahana a me ka manawa i ka wā o ka hoʻomaloʻo ʻana i mea e pale ai i ka hoʻohaʻahaʻa kiʻekiʻe a i ʻole ka agglomeration.

wili

Pono e lepo a kānana ʻia ka poloka HEC maloʻo e loaʻa ai ka puʻunaue like ʻole o ka nui o ka ʻāpana, a i ka hopena e hana i kahi pauka a i ʻole ka hua ʻōpala.

III. Nā hiʻohiʻona hana

Ka hoʻoheheʻe wai

He mea hiki ke hoʻoheheʻe ʻia i ka wai a hiki ke hoʻoheheʻe koke ʻia i loko o ka wai anuanu a me ka wai wela e hana ai i kahi hopena alohilohi a translucent paha. Hoʻohana nui ʻia kēia waiwai solubility e like me ka mānoanoa a me ka stabilizer i nā uhi a me nā huahana kemika i kēlā me kēia lā.

mānoanoa

Hōʻike ka HEC i kahi hopena mānoanoa ikaika i ka hoʻonā wai, a piʻi ka viscosity me ka piʻi ʻana o ke kaumaha molekala. ʻO kēia waiwai mānoanoa e hiki ai iā ia ke pāʻani 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 morta kūkulu hale.

Rheology

He ʻano rheological kūʻokoʻa ko HEC aqueous solution, a hoʻololi kona viscosity me ka loli o ka shear rate, e hōʻike ana i ka shear thinning a i ʻole pseudoplasticity. ʻO kēia waiwai rheological hiki iā ia ke hoʻoponopono i ka wai a me ka hana ʻana o ke kūkulu ʻana i nā uhi a me nā wai hoʻoheheʻe ʻaila.

Emulsification a me ka hoʻokuʻu ʻana

Loaʻa iā HEC nā waiwai emulsification a me ka hoʻokuʻu ʻana, hiki ke hoʻopaʻa i nā ʻāpana i hoʻokuʻu ʻia a i ʻole nā ​​droplets i loko o ka ʻōnaehana dispersion e pale ai i ka stratification a me ka sedimentation. No laila, hoʻohana pinepine ʻia ʻo HEC i nā huahana e like me nā emulsion coatings a me nā hoʻokuʻu lāʻau.

Hiki i ka biodegradability

ʻO ka HEC he cellulose derivative me ka biodegradability maikaʻi, ʻaʻohe haumia i ke kaiapuni, a hoʻokō i nā koi o ka pale o ka ʻōmaʻomaʻo.

IV. Nā kahua noi

Nā uhi

I loko o nā uhi wai, hoʻohana ʻia ʻo HEC ma ke ʻano he mānoanoa a me ka stabilizer e hoʻomaikaʻi i ka wai, hana hana a me nā waiwai anti-sagging o nā uhi.

Kūkulu

I nā mea kūkulu hale, hoʻohana ʻia ʻo HEC i ka mortar sima a me ka pauka putty e hoʻomaikaʻi i ka hana hana a me ka mālama ʻana i ka wai.

Nā Kemika o kēlā me kēia lā

I nā mea holoi, shampoos, a me nā niho niho, hoʻohana ʻia ʻo HEC ma ke ʻano he mānoanoa a me ka stabilizer e hoʻomaikaʻi i ka manaʻo a me ka paʻa o ka huahana. 

Nā ʻaila ʻaila

I ka hoʻoheheʻe ʻana i ka ʻaila hinu a me nā wai haʻihaʻi, hoʻohana ʻia ʻo HEC e hoʻoponopono i ka rheology a me nā waiwai hoʻokuʻu o nā wai wili a hoʻomaikaʻi i ka pono wili a me ka palekana.

Ka hana pepa

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

Ua hoʻohana nui ʻia ʻo Hydroxyethyl cellulose (HEC) i nā ʻano ʻoihana he nui ma muli o kona hoʻoheheʻe wai maikaʻi, mānoanoa, nā waiwai rheological, emulsification a me nā waiwai hoʻokuʻu, a me ka biodegradability maikaʻi. ʻO kāna kaʻina hana he ʻano makua. Ma o nāʻanuʻu o ka cellulose etherification, ka holoiʻana, ka maloʻo, ka maloʻo a me ka wiliʻana, hiki ke hoʻomākaukauʻia nā huahana HEC me ka hana paʻa a me ka maikaʻi. I ka wā e hiki mai ana, me ka hoʻomaikaʻi ʻana i nā koi o ka mālama ʻana i ke kaiapuni a me ka holomua o ka ʻenehana, e ʻoi aku ka laulā o nā noi noi o HEC.