He aha ke kumu maoli o ka hydroxyethyl cellulose?

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

Ke kumu maoli o ka cellulose
ʻO ka cellulose kekahi o nā polymers organik nui loa ma ka honua a aia nui i loko o nā paia cell o nā mea kanu, ʻoi loa i nā mea kanu lāʻau, pulupulu, flax a me nā mea kanu ʻē aʻe. He mea koʻikoʻi ia i ka hoʻolālā 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 paʻa β-1,4-glycosidic e hana i kahi ʻano kaulahao lōʻihi. Ma ke ʻano he mea polymer maoli, ʻoi aku ka maikaʻi o ka cellulose i nā waiwai kino a me nā kemika, e lilo ia i mea waiwai nui no nā ʻano derivatives.

Kaʻina hana hoʻomākaukau o ka hydroxyethyl cellulose
ʻOiai he nui nā waiwai maikaʻi o ka cellulose ponoʻī, ua kaupalena ʻia kāna ʻano noi i kekahi ʻano. ʻO ke kumu nui ʻo ka cellulose he haʻahaʻa haʻahaʻa, ʻoi aku ka liʻiliʻi 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 derivative cellulose. ʻO ka hydroxyethyl cellulose kahi wai-soluble cellulose ether i loaʻa ma o ka ethoxylating cellulose kūlohelohe ma o ka hopena kemika.

Ma ke kaʻina hana hoʻomākaukau kūikawā, hoʻoheheʻe mua ʻia ka cellulose kūlohelohe i ka hopena alkali, a laila hoʻohui ʻia ka ethylene oxide i ka ʻōnaehana pane. ʻO ka hopena ethoxylation o ka ethylene oxide a me nā pūʻulu hydroxyl i loko o ka cellulose e hana i ka hydroxyethyl cellulose. Hoʻonui kēia hoʻololi i ka hydrophilicity o nā kaulahao cellulose, a laila hoʻomaikaʻi i kona solubility a me nā waiwai viscosity i ka wai.

Nā kumu waiwai maka
ʻO ke kumu kumu maoli no ka hoʻomākaukau ʻana i ka hydroxyethyl cellulose he cellulose, a ʻo nā kumu kūlohelohe o cellulose e komo pū:

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

Pulupulu: ʻO ka pulupulu pulupulu ua aneane i haku ʻia me ka cellulose maʻemaʻe, a ʻo ka ʻike cellulose i loko o ka pulupulu he kiʻekiʻe ma mua o 90%. Ma muli o kona maʻemaʻe kiʻekiʻe, hoʻohana pinepine ʻia ka pulupulu no ka hoʻomākaukau ʻana i nā derivatives cellulose kiʻekiʻe.

Nā mea kanu e like me ke olonā a me ka hemp: Ua waiwai pū kēia mau mea kanu i ka cellulose, a no ka mea maʻamau ka ikaika mechanical kiʻekiʻe o kēia mau mea kanu, loaʻa iā lākou kekahi mau pono i ka lawe ʻana i ka cellulose.

ʻO ka ʻōpala mahiʻai: me ka mauʻu, ka mauʻu palaoa, ka mauʻu kulina, a me nā mea ʻē aʻe. Aia kēia mau mea i kahi nui o ka cellulose, a hiki ke unuhi ʻia ka cellulose mai ia mau mea ma o nā hana lapaʻau kūpono, e hāʻawi ana i kahi kumu kumu kūʻai kumu kūʻai kumu 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 i nā kula he nui. Eia kekahi mau wahi noi nui:

ʻOihana hana: Hoʻohana nui ʻia ka Hydroxyethyl cellulose i nā mea kūkulu hale ma ke ʻano he mānoanoa a me ka mea mālama wai, ʻoi aku hoʻi i ka mortar sima, gypsum, putty pauka 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 nā mea holoi, nā huahana mālama ʻili, nā shampoos a me nā huahana kemika ʻē aʻe i kēlā me kēia lā, hoʻohana ʻia ka hydroxyethyl cellulose ma ke ʻano he mānoanoa a me ka stabilizer e hoʻomaikaʻi i ka manaʻo a me ka paʻa o ka huahana.

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

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

ʻOiai ʻo ka hydroxyethyl cellulose ʻaʻole ia he mea kūlohelohe maoli, ʻo kāna kumu kumu, cellulose, aia nui i nā mea kanu i ke ʻano. Ma o ka hoʻololi kemika, hiki ke hoʻololi i ka cellulose kūlohelohe i hydroxyethyl cellulose me ka hana maikaʻi loa a hoʻohana ʻia i nā ʻoihana like ʻole. Hāʻawi nā mea kanu kūlohelohe e like me ka lāʻau, ka pulupulu, ke olonā, a me nā mea ʻē aʻe i kumu waiwai o nā mea maka no ka hana ʻana i ka hydroxyethyl cellulose. Me ka holomua o ka ʻepekema a me ka ʻenehana a me ka piʻi ʻana o ka noi ʻoihana, ke hoʻomau ʻia nei ke kaʻina hana o ka hydroxyethyl cellulose, a manaʻo ʻia e hōʻike i kona waiwai kūʻokoʻa i nā kula hou aʻe i ka wā e hiki mai ana.