Hydroxyethyl Methyl Cellulose

ʻO ka cellulose ether kahi mea hoʻohana nui polymer maikaʻi kemika i hana ʻia mai ka polymer cellulose kūlohelohe ma o ka mālama kemika. Ma hope o ka hana ʻana o cellulose nitrate a me cellulose acetate i ke kenekulia 19, ua hoʻomohala ka poʻe chemist i kahi ʻano o nā cellulose derivatives o nā cellulose ethers he nui, a ua ʻike mau ʻia nā kahua noi hou, e pili ana i nā ʻāpana ʻoihana. ʻO nā huahana cellulose ether e like me ka sodium carboxymethyl cellulose (CMC), ethyl cellulose (EC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), methyl hydroxyethyl cellulose (MHEC) a me methyl hydroxypropyl cellulose (MHPC) a me nā cellulose ethers ʻē aʻe. "ʻoihana monosodium glutamate" a ua hoʻohana nui ʻia i ka hoʻoheheʻe ʻana i ka aila, ke kūkulu ʻana, ka uhi, ka meaʻai, ka lāʻau lapaʻau a me nā kemika o kēlā me kēia lā.

Hydroxyethylmethylcellulose(MHEC) he pauka keʻokeʻo ʻona ʻole, ʻono ʻole, hiki ke hoʻoheheʻe ʻia i loko o ka wai anuanu e hana ai i kahi hopena viscous akaka. Loaʻa iā ia nā hiʻohiʻona o ka mānoanoa, hoʻopaʻa, hoʻopuehu, emulsifying, hana kiʻiʻoniʻoni, hoʻopaneʻe, adsorbing, gelling, surface active, mālama i ka moisture a me ka pale ʻana i ka colloid. Ma muli o ka hana hoʻoikaika o ka wai, hiki ke hoʻohana ʻia ma ke ʻano he mea pale colloidal, emulsifier a me dispersant. ʻO ka hydroxyethyl methylcellulose aqueous solution he hydrophilicity maikaʻi a he mea mālama wai kūpono. Ma muli o ka hydroxyethyl methylcellulose i loko o nā pūʻulu hydroxyethyl, loaʻa iā ia ka mana anti-mildew maikaʻi, ka paʻa viscosity maikaʻi a me ka pale ʻana i ka maʻi i ka wā mālama lōʻihi.

Hoʻomākaukauʻia ka Hydroxyethyl methylcellulose (HEMC) ma ka hoʻokomoʻana i nā mea pani ethylene oxide (MS 0.3 ~ 0.4) i loko o ka methylcellulose (MC), aʻoi aku ka maikaʻi o kona paʻakai paʻakai ma mua o nā polymers i hoʻololiʻoleʻia. ʻOi aku ka kiʻekiʻe o ka mahana gelation o ka methylcellulose ma mua o ka MC.

Kapili:

Hiʻona:

ʻO nā hiʻohiʻona nui o ka hydroxyethyl methylcellulose (HEMC) he:

1. Solubility: Hiki ke hoʻoheheʻe ʻia i ka wai a me kekahi mau mea hoʻoheheʻe organik. Hiki ke hoʻoheheʻe ʻia ka HEMC i ka wai anuanu. Hoʻoholo ʻia kona ʻano kiʻekiʻe loa e ka viscosity. ʻokoʻa ka solubility me ka viscosity. ʻO ka haʻahaʻa o ka viscosity, ʻoi aku ka nui o ka solubility.
2. Paʻakai paʻakai: ʻO nā huahana HEMC he non-ionic cellulose ethers a ʻaʻole polyelectrolytes, no laila ua paʻa lākou i ka wai wai ke loaʻa nā paʻakai metala a i ʻole nā ​​​​electrolytes organik, akā hiki i ka hoʻohui nui ʻana o nā electrolytes ke kumu i ka gelation a me ka ua.
3. Ka hana o ka ʻili: Ma muli o ka hana o ka ʻili o ka wai, hiki ke hoʻohana ʻia e like me ka colloidal protect agent, emulsifier a me dispersant.
4. Thermal gel: Ke wela ka wai o nā huahana HEMC i kekahi mahana, lilo ia i opaque, gels, a me nā precipitates, akā i ka wā e hoʻomau mau ʻia, hoʻi ia i ka mokuʻāina hoʻonā kumu, a me ka mahana o kēia gel a me ka ua. Aia ma muli o lākou nā lubricants, nā mea kōkua, nā colloids pale, emulsifiers etc.
5. Metabolism inert a haʻahaʻa haʻahaʻa a me ka ʻala: HEMC hoʻohana nui ʻia i ka meaʻai a me ka lāʻau lapaʻau no ka mea ʻaʻole ia e metabolized a he haʻahaʻa haʻahaʻa a he ʻala.
6. Ka pale ʻana i ka maʻi: HEMC maikaʻi ke kūpaʻa ʻana i ka pulupulu a me ka paʻa viscosity maikaʻi i ka wā mālama lōʻihi.
7. Paʻa PH: ʻAʻole paʻa ka viscosity o ka hopena wai o nā huahana HEMC e ka waikawa a i ʻole ka alkali, a paʻa ka pH waiwai i loko o ka laulā o 3.0 a 11.0.

Noi:

Hiki ke hoʻohana ʻia ka Hydroxyethyl methylcellulose ma ke ʻano he mea pale colloidal, emulsifier a me ka dispersant ma muli o kāna hana ma luna o ka wai. ʻO kāna mau laʻana hoʻohana penei:

1. Ka hopena o ka hydroxyethyl methylcellulose ma ka hana sima. ʻO ka Hydroxyethyl methylcellulose ka pauka keʻokeʻo ʻole, ʻono ʻole, hiki ke hoʻoheheʻe ʻia i loko o ka wai anuanu e hana ai i kahi hopena ʻālohilohi. Loaʻa iā ia nā hiʻohiʻona o ka mānoanoa, hoʻopaʻa, hoʻopuehu, emulsifying, hana kiʻiʻoniʻoni, hoʻopaneʻe, adsorbing, gelling, surface active, mālama i ka moisture a me ka pale ʻana i ka colloid. Ma muli o ka hana ʻana o ka ʻili wai, hiki ke hoʻohana ʻia ma ke ʻano he mea pale colloidal, emulsifier a me dispersant. ʻO ka hydroxyethyl methylcellulose aqueous solution he hydrophilicity maikaʻi a he mea mālama wai kūpono.
2. Hoʻomākaukau ʻia kahi pena hoʻomaha me ka maʻalahi kiʻekiʻe, i hana ʻia me nā mea maka ma lalo o nā ʻāpana ma ke kaupaona: 150-200 g o ka wai deionized; 60-70 g o ka emulsion acrylic maʻemaʻe; 550-650 g o ka calcium kaumaha; 70-90 g o ka talcum pauka; 30-40g base cellulose aqueous solution; 10-20g lignoscellulose aqueous solution; 4-6g kōkua hana kiʻiʻoniʻoni; 1.5-2.5g antiseptic a me ka bactericide; 1.8-2.2g dispersant; 3.5-4.5g; Ethylene glycol 9-11g; ʻO ka hydroxyethyl methylcellulose aqueous solution i hanaʻia ma ka hoʻoheheʻeʻana i ka 2-4% hydroxyethyl methylcellulose i loko o ka wai; Hana ʻia ka lignoscellulose aqueous solution o 1-3 % Lignocellulose i hana ʻia ma ka hoʻoheheʻe ʻana i ka wai.

Hoʻomākaukau:

ʻO kahi ʻano hoʻomākaukau o ka hydroxyethyl methylcellulose, ʻo ke ʻano o ka hoʻohana ʻana i ka pulupulu i hoʻomaʻemaʻe ʻia e like me ka mea maka a me ka ethylene oxide ma ke ʻano he etherification agent e hoʻomākaukau ai i ka hydroxyethyl methylcellulose. ʻO nā ʻāpana kaumaha o nā mea maka no ka hoʻomākaukau ʻana i ka hydroxyethyl methyl cellulose penei: 700-800 mau ʻāpana o toluene a me ka hui isopropanol e like me ka solvent, 30-40 mau ʻāpana wai, 70-80 mau ʻāpana o ka sodium hydroxide, 80-85 mau ʻāpana o ka pulupulu hoʻomaʻemaʻe, apo 20-28 hapa o ka oxyethane, 80-90 hapa o ka methyl chloride, 16-19 hapa o ka glacial acetic acid; ʻo nā ʻanuʻu kikoʻī:

ʻO ka ʻanuʻu mua, i loko o ke kīʻaha pane, e hoʻohui i ka toluene a me ka hui isopropanol, ka wai, a me ka sodium hydroxide, wela a hiki i 60-80 ° C, mālama i ka mahana no 20-40 mau minuke;

ʻO ka lua o ka ʻanuʻu, alkalization: hooluolu i nā mea i luna i 30-50 ° C, hoʻohui i ka pulupulu i hoʻomaʻemaʻe ʻia, kāpīpī i ka toluene a me ka isopropanol hui ʻana i ka solvent, pahū iā ia i 0.006Mpa, hoʻopiha i ka nitrogen no 3 mau pani, a hoʻokō ma hope o ka hoʻololi ʻana i ka Alkalinization, ka ʻO nā kūlana alkalization: ʻo ka manawa alkaliization he 2 mau hola, a ʻo ka mahana alkaliization ʻo 30 ° C a 50 ° C;

ʻO ke kolu o ka ʻanuʻu, etherification: ma hope o ka pau ʻana o ka alkalization, ua hoʻokuʻu ʻia ka reactor i 0.05-0.07MPa, a hoʻohui ʻia ka ethylene oxide a me ka methyl chloride no 30-50 mau minuke; ka pae mua o ka etherification: 40-60 ° C, 1.0-2.0 Hours, hoʻomaluʻia ke kaomi ma waena o 0.15 a me 0.3Mpa; ka lua o ka pae o ka etherification: 60 ~ 90 ℃, 2.0 ~ 2.5 hola, ke kaomi ʻia ma waena o 0.4 a me 0.8Mpa;

ʻO ka ʻehā ʻanuʻu, neutralization: E hoʻohui i ka wai acetic glacial i ana ma mua i ka ipu wai, kaomi i loko o ka mea etherified no ka neutralization, hoʻonui i ka mahana i 75-80 ° C no ka ua, piʻi ka mahana i 102 ° C, a me ka pH ʻO ka waiwai he 6 Ma ka hola 8, ua pau ka desolvantization; hoʻopiha ʻia ka pahu desolventization me ka wai paila i mālama ʻia e kahi mea osmosis reverse ma 90 ° C a 100 ° C;

ʻO ka lima o ka ʻanuʻu, ka holoi centrifugal: ʻo ka mea ma ka ʻanuʻu ʻehā e centrifuged ma o ka centrifuge screw horizontal, a hoʻoneʻe ʻia ka mea i hoʻokaʻawale ʻia i kahi pahu holoi i hoʻopiha ʻia me ka wai wela ma mua no ka holoi ʻana i ka mea;

ʻO ke ono o ka ʻanuʻu, ka hoʻomaloʻo centrifugal: lawe ʻia ka mea holoi i loko o ka mea maloʻo ma o ka centrifuge screw horizontal, a maloʻo ka mea ma 150-170 ° C, a ʻoki ʻia ka mea maloʻo a hoʻopaʻa ʻia.

Hoʻohālikelike ʻia me ka ʻenehana hana cellulose ether e loaʻa nei, hoʻohana ka mea hou i kēia manawa i ka ethylene oxide ma ke ʻano he etherification agent e hoʻomākaukau ai i ka hydroxyethyl methyl cellulose, nona ka mana anti-mold maikaʻi ma muli o ka loaʻa ʻana o nā pūʻulu hydroxyethyl. Loaʻa iā ia ka paʻa viscosity maikaʻi a me ka pale ʻana i ka maʻi i ka wā mālama lōʻihi. Hiki ke hoʻohana ʻia ma kahi o nā cellulose ethers.