He aha ke kumu kūlohelohe o ka hydroxyethyl cellulose?

ʻO ka Hydroxyethyl cellulose (HEC) kahi mea polymer wai-soluble non-ionic i hoʻohana nui ʻia i nā mea hoʻonani, nā lāʻau lapaʻau, nā pena, nā uhi, ke kūkulu ʻana a me nā ʻoihana ʻē aʻe. Loaʻa iā ia ka mānoanoa maikaʻi loa, ka hoʻokuʻu ʻana, ka hoʻopuehu ʻana, ka emulsification, ka hana ʻana i nā kiʻiʻoniʻoni, ka paʻa ʻana i ka wai a me nā waiwai ʻē aʻe, no laila ua lilo ia i mea kōkua koʻikoʻi i nā ʻoihana he nui. Eia nō naʻe, ʻaʻole i loaʻa pololei ka hydroxyethyl cellulose mai nā mea kūlohelohe, akā ua loaʻa ma ka hoʻololi kemika ʻana i ka cellulose kūlohelohe. No kēia hopena, i mea e hoʻomaopopo ai i ke kumu kūlohelohe o ka hydroxyethyl cellulose, pono mua mākou e hoʻomaopopo i ke kumu a me ke ʻano o ka cellulose.

Kumu kūlohelohe o ka cellulose
ʻO ka Cellulose kekahi o nā polymers organik nui loa ma ka honua a loaʻa nui ia i loko o nā paia cell o nā mea kanu, ʻoi aku hoʻi i nā mea kanu lāʻau, pulupulu, olonā a me nā olonā mea kanu ʻē aʻe. He mea nui ia i ke ʻano o nā mea kanu a hāʻawi i ka ikaika mechanical a me ke kūpaʻa. ʻO ka ʻāpana kumu o ka cellulose he mole glucose, i hoʻopili ʻia e nā pilina β-1,4-glycosidic e hana i kahi ʻano kaulahao lōʻihi. Ma ke ʻano he mea polymer kūlohelohe, loaʻa i ka cellulose nā waiwai kino a me nā kemika maikaʻi loa, e lilo ia i mea maka koʻikoʻi no nā ʻano derivatives like ʻole.

Ke kaʻina hana hoʻomākaukau o ka hydroxyethyl cellulose
ʻOiai he nui nā waiwai maikaʻi o ka cellulose ponoʻī, ua kaupalena ʻia kona laulā noi i kekahi ʻano. ʻO ke kumu nui, ʻo ka cellulose he palupalu ka solubility, ʻoi aku ka palena o ka solubility i ka wai. I mea e hoʻomaikaʻi ai i kēia waiwai, hoʻololi kemika nā kānaka ʻepekema i ka cellulose e hoʻomākaukau i nā ʻano derivatives cellulose like ʻole. ʻO ka Hydroxyethyl cellulose kahi cellulose ether hiki ke hoʻoheheʻe ʻia i ka wai i loaʻa ma o ka ethoxylating cellulose kūlohelohe ma o ka hopena kemika.

I ke kaʻina hana hoʻomākaukau kikoʻī, hoʻoheheʻe mua ʻia ka cellulose kūlohelohe i loko o ka hopena alkali, a laila hoʻohui ʻia ka ethylene oxide i ka ʻōnaehana hana. Hana ʻia ka hana ethoxylation o ka ethylene oxide a me nā hui hydroxyl i loko o ka cellulose e hana i ka hydroxyethyl cellulose. Hoʻonui kēia hoʻololi i ka hydrophilicity o nā kaulahao cellulose, no laila e hoʻomaikaʻi ana i kona solubility a me nā waiwai viscosity i ka wai.

Nā kumu waiwai nui
ʻO ka cellulose ka mea maka maoli no ka hoʻomākaukau ʻana o ka hydroxyethyl cellulose, a ʻo nā kumu kūlohelohe o ka cellulose:

Lāʻau: Kiʻekiʻe ka nui o ka cellulose i loko o ka lāʻau, ʻoi aku hoʻi i ka lāʻau coniferous a me ka lau ākea, kahi e hiki ai i ka cellulose ke hiki i ka 40%-50%. ʻO ka lāʻau kekahi o nā kumu nui o ka cellulose i ka ʻoihana, ʻoi aku hoʻi i ka hana pepa a me ka hana ʻana i nā derivatives cellulose.

Pulupulu: Ua aneane haku ʻia ka pulupulu i ka cellulose maʻemaʻe, a ʻoi aku ka nui o ka cellulose i loko o ka pulupulu ma mua o 90%. Ma muli o kona maʻemaʻe kiʻekiʻe, hoʻohana pinepine ʻia ka pulupulu e hoʻomākaukau i nā derivatives cellulose kiʻekiʻe.

ʻO nā olonā mea kanu e like me ka flax a me ka hemp: He waiwai nui kēia mau olonā mea kanu i ka cellulose, a no ka mea he kiʻekiʻe ka ikaika mechanical o kēia mau olonā mea kanu, loaʻa iā lākou kekahi mau pono i ka unuhi ʻana o ka cellulose.

ʻŌpala mahiʻai: me ka mauʻu maloʻo, ka mauʻu palaoa, ka mauʻu kulina, a pēlā aku. Loaʻa i kēia mau mea kahi nui o ka cellulose, a hiki ke hoʻokaʻawale ʻia ka cellulose mai ia mau mea ma o nā kaʻina hana kūpono, e hāʻawi ana i kahi kumu waiwai a me ka hiki ke hoʻohou hou ʻia o nā mea maka no ka hana ʻana i nā derivatives cellulose.

Nā wahi noi o ka hydroxyethyl cellulose
Ma muli o nā waiwai kūikawā o ka hydroxyethyl cellulose, hoʻohana nui ʻia ia ma nā ʻano he nui. Eia kekahi mau wahi noi nui:

ʻOihana kūkulu hale: Hoʻohana nui ʻia ka Hydroxyethyl cellulose i nā mea kūkulu hale ma ke ʻano he mea hoʻomānoanoa a me ka mea mālama wai, ʻoi aku hoʻi i ka sima sima, gypsum, pauka putty a me nā mea ʻē aʻe, hiki ke hoʻomaikaʻi maikaʻi i ke kūkulu ʻana a me nā waiwai mālama wai o nā mea.

ʻOihana kemika o kēlā me kēia lā: I loko o nā detergents, nā huahana mālama ʻili, nā shampoos a me nā huahana kemika ʻē aʻe o kēlā me kēia lā, hoʻohana ʻia ka hydroxyethyl cellulose ma ke ʻano he thickener a me ka stabilizer e hoʻomaikaʻi i ka manaʻo a me ke kūpaʻa o ka huahana.

Nā pena a me nā uhi: I ka ʻoihana uhi, hoʻohana ʻia ka hydroxyethyl cellulose ma ke ʻano he mea hoʻomānoanoa a me ka mea hoʻomalu rheology e hoʻomaikaʻi i ka hana o ka uhi a pale i ka sagging.

Kahua lāʻau lapaʻau: I nā hoʻomākaukau lāʻau lapaʻau, hiki ke hoʻohana ʻia ka hydroxyethyl cellulose ma ke ʻano he mea hoʻopaʻa, mānoanoa a me ka mea hoʻokuʻu no nā papa e hoʻomaikaʻi i nā ʻano hoʻokuʻu a me ke kūpaʻa o nā lāʻau.

ʻOiai ʻaʻole he mea kūlohelohe ka hydroxyethyl cellulose, ʻo kona mea maka kumu, ʻo cellulose, ua loaʻa nui i nā mea kanu ma ke ʻano. Ma o ka hoʻololi kemika, hiki ke hoʻololi ʻia ka cellulose kūlohelohe i hydroxyethyl cellulose me ka hana maikaʻi loa a hoʻohana ʻia i nā ʻoihana like ʻole. ʻO nā mea kanu kūlohelohe e like me ka lāʻau, ka pulupulu, ka olonā, a me nā mea ʻē aʻe e hāʻawi i kahi kumu waiwai o nā mea maka no ka hana ʻana o ka hydroxyethyl cellulose. Me ka holomua o ka ʻepekema a me ka ʻenehana a me ka hoʻonui ʻana o ke koi ʻoihana, ke hoʻomaikaʻi mau ʻia nei ke kaʻina hana o ka hydroxyethyl cellulose, a ke manaʻo ʻia nei e hōʻike i kona waiwai kūikawā ma nā kahua hou aʻe i ka wā e hiki mai ana.