Methyl Hydroxyethyl Cellulose (MHEC)

ʻO ka Methyl Hydroxyethyl Cellulose (MHEC) kahi ether cellulose maʻamau. Loaʻa ia ma ka etherification o cellulose a hoʻohana nui ʻia i nā ʻoihana he nui e like me ke kūkulu ʻana, nā lāʻau lapaʻau, nā mea hoʻonaninani, a me nā meaʻai. Loaʻa i ka MHEC ka hoʻoheheʻe wai maikaʻi, ka mānoanoa, ka hoʻokuʻu ʻana, a me nā waiwai paʻa, a he mea hoʻohui koʻikoʻi nui.

1. ʻO ke kinona a me ka hoʻomākaukau ʻana

1.1 Kemimi

Loaʻa ka MHEC e ka methylation hapa a me ka hydroxyethylation o cellulose. Hoʻokumu nui ʻia kona ʻano kemika e ka hoʻololi ʻana o ka pūʻulu hydroxyl ma ke kaulahao mole cellulose e methyl (-CH₃) a me hydroxyethyl (-CH₂CH₂OH). Hōʻike pinepine ʻia kona ʻano hana e like me:

Kele−��−����3+Keula−��−����2����2����Keola−O−CH 3+Keula−O−CH 2CH 2OH

Hōʻike ka cell i ka ʻiʻo mole mole cellulose. ʻO ke kiʻekiʻe o ka hoʻololi ʻana o nā hui methyl a me hydroxyethyl e pili ana i nā waiwai o MHEC, e like me ka wai solubility a me ka viscosity.

1.2 Kaʻina hana hoʻomākaukau

ʻO ka hoʻomākaukau ʻana i ka MHEC ka mea nui i nā pae aʻe:

Etherification reaction: Me ka hoʻohana ʻana i ka cellulose ma ke ʻano he mea maka, e mālama mua ʻia me kahi solution alkaline (e like me ka sodium hydroxide) e hoʻāla ai i nā pūʻulu hydroxyl i cellulose. A laila hoʻohui ʻia ka methanol a me ka ethylene oxide e hoʻokō i ka hopena etherification i mea e pani ʻia ai nā pūʻulu hydroxyl ma cellulose e nā hui methyl a me hydroxyethyl.

Neutralization a me ka holoi ʻana: Ma hope o ka pau ʻana o ka hopena, hoʻoneʻe ʻia ka alkali keu e ka hopena neutralization acid, a holoi pinepine ʻia ka huahana hopena me ka wai e wehe i nā huahana a me nā mea maka ʻole.

ʻO ka maloʻo a me ka ʻoki ʻana: Hoʻomaloʻo ʻia ka hoʻokuʻu ʻana o ka MHEC i holoi ʻia no ka loaʻa ʻana o ka pauka MHEC, a ʻoki ʻia i hope e loaʻa ai ka maikaʻi i makemake ʻia.

2. Ka waiwai kino a me ke kemika

2.1 ʻO ke ʻano a me ka solubility

ʻO ka MHEC kahi pauka keʻokeʻo a māmā paha i hiki ke hoʻoheheʻe ʻia i ka wai anuanu a me ka wai wela, akā haʻahaʻa ka solubility i nā mea hoʻoheheʻe organik. Pili kona solubility i ka waiwai pH o ka hoʻonā, a hōʻike ia i ka solubility maikaʻi ma ke kūʻokoʻa i ka pae ʻawaʻawa nāwaliwali.

2.2 ʻO ka mānoanoa a me ka hoʻomaha

Hiki i ka MHEC ke hoʻonui nui i ka viscosity o ka hopena ma hope o ka hoʻoheheʻe ʻana i ka wai, no laila hoʻohana nui ʻia e like me ka mānoanoa. Ma ka manawa like, loaʻa iā MHEC ka hoʻokuʻu maikaʻi a me ka dispersibility, hiki ke pale i ka sedimentation particle, e hoʻohana ʻia ma ke ʻano he mea hoʻokuʻu i ka uhi a me nā mea kūkulu hale.

2.3 Paʻa a kūpono

Loaʻa ka MHEC i ka waikawa a me ka paʻa alkali a hiki ke mālama i kona kūpaʻa ma kahi ākea pH ākea. Eia hou, ua hoʻomanawanui maikaʻi ʻo MHEC i nā electrolytes, hiki iā ia ke hana maikaʻi i nā ʻōnaehana kemika.

3. Nā kahua noi

3.1 ʻOihana kūkulu

Ma ke kahua kūkulu, hoʻohana nui ʻia ka MHEC ma ke ʻano he mānoanoa a me ka mea mālama wai no nā mea e like me ka mortar, putty, a me ka gypsum. Hiki i ka MHEC ke hoʻomaikaʻi maikaʻi i ka hana hana o nā mea kūkulu hale, hoʻonui i ka adhesion a me nā waiwai anti-sagging i ka wā o ke kūkulu ʻana, hoʻolōʻihi i ka manawa hāmama, a ma ka manawa like e hoʻomaikaʻi i ka paʻa ʻana o ka wai o nā mea e pale ai i ka haki ʻana a me ka hoʻohaʻahaʻa ikaika ma muli o ka wikiwiki o ka wai.

3.2 Mea hoʻonani

Hoʻohana ʻia ʻo MHEC ma ke ʻano he emulsifier, thickener, a stabilizer i nā mea hoʻonaninani. Hiki iā ia ke hāʻawi i nā mea hoʻonaninani i kahi paʻi maikaʻi a me ka rheology, hoʻonui i ka paʻa a hoʻohana i ka ʻike o ka huahana. No ka laʻana, i nā huahana e like me nā lotions, creams, a me nā shampoos, hiki i ka MHEC ke pale pono i ka stratification a me ka ua a hoʻonui i ka viscosity o ka huahana.

3.3 ʻOihana lāʻau lapaʻau

Ma ka ʻoihana lāʻau lapaʻau, hoʻohana ʻia ʻo MHEC ma ke ʻano he mea hoʻopaʻa, hoʻokuʻu hoʻomau, a me ka mea hoʻomaha no nā papa. Hiki iā ia ke hoʻomaikaʻi i ka paʻakikī a me ka disintegration waiwai o nā papa a hōʻoia i ka hoʻokuʻu paʻa o nā lāʻau lapaʻau. Eia kekahi, hoʻohana pinepine ʻia ka MHEC i nā lāʻau hoʻokuʻu e kōkua i nā mea hana e hoʻopuehu like a hoʻomaikaʻi i ka paʻa a me ka bioavailability o nā lāʻau lapaʻau.

3.4 ʻOihana Meaʻai

I ka ʻoihana meaʻai, hoʻohana nui ʻia ʻo MHEC ma ke ʻano he mānoanoa a me ka stabilizer, a kūpono ia no nā ʻano meaʻai like ʻole, e like me nā huahana dairy, sauces, condiments, etc. meaʻai.

4. Ka palekana a me ka palekana

4.1 Hana Kaiapuni

Loaʻa i ka MHEC ka biodegradability maikaʻi a ʻaʻohe mea haumia i ke kaiapuni. No ka mea he cellulose kona mau mea nui a me kāna mau derivatives, hiki i ka MHEC ke hoʻohaʻahaʻa haʻahaʻa i nā mea ʻino ʻole i loko o ke kaiapuni kūlohelohe a ʻaʻole e hoʻopilikia i ka lepo a me nā kino wai.

4.2 Palekana

He palekana kiʻekiʻe ka MHEC a ʻaʻohe mea ʻawaʻawa a maikaʻi ʻole i ke kino kanaka. Ke hoʻohana ʻia i ka ʻoihana meaʻai a me nā ʻoihana meaʻai, pono ia e hoʻokō i nā kūlana palekana a me nā lula e hōʻoia i ka ʻike o ka MHEC i ka huahana i loko o ka pae i kuhikuhi ʻia. I ka wā o ka hoʻohana ʻana, pono e mālama ʻia e pale i ka inhalation o ka nui o ka lepo e pale aku i ka ʻeha hanu.

5. Nā ʻano hoʻomohala e hiki mai ana

5.1 Hoʻonui i ka hana

ʻO kekahi o nā kuhikuhi noiʻi e hiki mai ana o MHEC e hoʻomaikaʻi hou i kāna hana ma o ka hoʻomaikaʻi ʻana i ke kaʻina hana synthesis a me ka hoʻolālā formula. No ka laʻana, ma ka hoʻonui ʻana i ke kiʻekiʻe o ka hoʻololi ʻana a me ka hoʻomaikaʻi ʻana i ke ʻano molecular, hiki i ka MHEC ke loaʻa i ka hana ʻoi aku ka maikaʻi ma nā hiʻohiʻona noi kūikawā, e like me ke kūpaʻa kiʻekiʻe o ka wela, ka waikawa a me ke kūpaʻa alkali, etc.

5.2 Hoʻonui noi

Me ka hoʻomau mau ʻana o nā mea hou a me nā kaʻina hana hou, ua manaʻo ʻia e hoʻonui ʻia ke kahua noi o MHEC. No ka laʻana, ma ke kahua o ka ikehu hou a me nā mea hou, MHEC, ma ke ʻano he mea hoʻohui hana, hiki ke pāʻani i kahi hana koʻikoʻi.

5.3 Ka palekana a me ka hoʻomau

Me ka hoʻomaikaʻi ʻana i ka ʻike kaiapuni, e hoʻomohala ʻia ka hana ʻana a me ka hoʻohana ʻana o MHEC i kahi ʻoi aku ka maikaʻi o ke kaiapuni a me ka hoʻomau. Hiki ke nānā aku ka noiʻi e hiki mai ana i ka hōʻemi ʻana i ka hoʻokuʻu ʻana i ka ʻōpala i ke kaʻina hana, ka hoʻomaikaʻi ʻana i ka biodegradability o nā huahana, a me ka hoʻomohala ʻana i nā kaʻina hana ʻōmaʻomaʻo.

ʻO ka Methyl hydroxyethyl cellulose (MHEC), ma ke ʻano he multifunctional cellulose ether, loaʻa nā manaʻo noi ākea a me ka hiki ke hoʻomohala. Ma o ka noiʻi hohonu e pili ana i kāna mau waiwai kemika a me ka hoʻomaikaʻi ʻana i ka ʻenehana noiʻi, e pāʻani ʻo MHEC i kahi kūlana koʻikoʻi i nā ʻoihana like ʻole a kōkua i ka hoʻomaikaʻi ʻana i ka hana huahana a me ka pale ʻana i ke kaiapuni. I ka wā e hiki mai ana o ka ʻepekema waiwai a me ka ʻenekinia, ʻo ka noi ʻana o MHEC e lawe mai i nā mea hou aʻe a me nā holomua.