Ka noi a me ka hoʻomākaukau ʻana o ka hydroxyethyl methyl cellulose HEMC

Hiki ke hoʻohana ʻia ka Hydroxyethyl methyl cellulose HEMC e like me ka colloid protection agent, emulsifier a me dispersant ma muli o kāna hana ʻeleʻele i ka wai. ʻO kahi laʻana o kāna noi penei: ʻO ka hopena o ka hydroxyethyl methyl cellulose i nā waiwai o ka sima. ʻO ka Hydroxyethyl methylcellulose he pauka keʻokeʻo ʻole, ʻono ʻole, ʻaʻole ʻona i hoʻoheheʻe ʻia i loko o ka wai anuanu e hana ai i kahi hopena akaka. Loaʻa iā ia nā waiwai o ka mānoanoa, hoʻopaʻa, dispersing, emulsifying, film-forming, suspending, adsorbing, gelling, surface-active, hoʻopaʻa i ka wai a me ka pale ʻana i nā colloids. Ma muli o ka hana o ka ʻili o ka wai, hiki ke hoʻohana ʻia e like me kahi mea pale colloid, emulsifier a me kahi dispersant. ʻO Hydroxyethyl methyl cellulose aqueous solution he hydrophilicity maikaʻi a he mea hoʻopaʻa wai kiʻekiʻe.

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

ʻO ka ʻanuʻu mua, i loko o ka reactor, e hoʻohui i ka toluene a me ka hui isopropanol, ka wai, a me ka sodium hydroxide, e hoʻomehana ʻia a hiki i 60 ~ 80 ℃, e hoʻomoʻa ʻia 20 ~ 40 mau minuke;

ʻO ka lua o ka ʻanuʻu, alkalization: hoʻoluʻu i nā mea i luna i 30 ~ 50 ℃, hoʻohui i ka pulupulu i hoʻomaʻemaʻe ʻia, kāpīpī i ka hui ʻana o toluene a me isopropanol me ka solvent, hoʻokuʻu i 0.006Mpa, hoʻopiha me ka nitrogen no 3 mau pani, a lawe i ka alkali ma hope o ka hoʻololi ʻana. ʻO nā kūlana penei: ʻo ka manawa alkalization he 2 hola, a ʻo ka mahana alkaliization he 30 ° C a 50 ° C;

ʻO ke kolu o ka ʻanuʻu, etherification: ua pau ka alkalization, ua hoʻokuʻu ʻia ka reactor i 0.05 ~ 0.07MPa, hoʻohui ʻia ka ethylene oxide a me ka methyl chloride, a mālama ʻia no 30 ~ 50 mau minuke; ka pae mua o ka etherification: 40 ~ 60 ℃, 1.0 ~ 2.0 hola, hoʻomalu ʻia ke kaomi ma waena o 0.150.3Mpa; ka lua o ka pae o ka etherification: 60 ~ 90 ℃, 2.0 ~ 2.5 hola, ke kaomi ʻia ma waena o 0.40.8Mpa;

ʻO ka 4th step, neutralization: hoʻohui i ka metered glacial acetic acid i mua i ka ipu wai, kaomi i loko o ka mea etherified no ka neutralization, wela i 75 ~ 80 ℃ e hoʻokō i ka ua, piʻi ka mahana i 102 ℃, a ʻo ka helu pH ʻike. 68 Ke hoʻopau ʻia ka ua, hoʻopiha ʻia ka pahu wai i ka wai paipu i mālama ʻia e ka mea hoʻohuli osmosis ma 90 ℃ ~ 100 ℃;

ʻO ka lima o ka ʻanuʻu, ka holoi centrifugal: ʻo ka mea ma ka ʻehā o ka ʻanuʻu e centrifuged e ka centrifuge screw horizontal, a hoʻoneʻe ʻia ka mea i hoʻokaʻawale ʻia i kahi ipu holoi i hoʻopiha ʻia me ka wai wela ma mua, a holoi ʻia 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, maloʻo ka mea ma 150-170 ° C, a hoʻomaloʻo ʻia ka mea maloʻo a hoʻopaʻa ʻia.

Ke hoʻohālikelike ʻia me ka ʻenehana hana cellulose ether e loaʻa nei, ua hoʻohana ka mea hana i kēia manawa i ka ethylene oxide ma ke ʻano he etherifying agent e hoʻomākaukau ai i ka hydroxyethyl methyl cellulose, a loaʻa iā ia ka mana anti-mildew maikaʻi no ka mea aia ka pūʻulu hydroxyethyl, ʻO ke kūpaʻa viscosity maikaʻi a me ka pale ʻana i ka wā lōʻihi. Hiki ke hoʻohana ʻia ma kahi o nā cellulose ethers.