Kunatswa kweHydroxyethyl cellulose

Hydroxyethyl cellulose(HEC) ipolymer inonyungudika nemvura inoshandiswa zvakanyanya mumaindasitiri akasiyana semishonga, zvizorwa, uye chikafu. HEC inotorwa kubva kune cellulose, yakasikwa polymer inowanikwa mumiti, uye inogadziriswa nemapoka e-hydroxyethyl kuti ivandudze kunyungudika kwemvura uye zvimwe zvinhu.

Kunatsiridzwa kweHEC kunosanganisira matanho akati wandei ekuchenesa nekugadzirisa iyo polymer kuti isangane nezvinodiwa zvekushandisa kwayo. Aya anotevera mamwe ematanho akajairwa anobatanidzwa mukunatswa kweHEC:

1. Kucheneswa: Nhanho yekutanga mukunatswa kweHEC ndiko kucheneswa kwe cellulose raw material. Izvi zvinosanganisira kubvisa tsvina yakadai se lignin, hemicellulose, nezvimwe zvinosvibisa zvinogona kukanganisa kunaka uye zvinhu zvechigadzirwa chekupedzisira. Kucheneswa kunogona kuwanikwa kuburikidza nenzira dzakasiyana-siyana dzakadai sekugeza, bleaching, uye enzymatic kurapwa.

2. Alkalization: Mushure mekucheneswa, cellulose inobatwa neine alkaline solution kuti iwedzere reactivity yayo uye kufambisa kuiswa kwemapoka e-hydroxyethyl. Alkalization inowanzoitwa ne sodium hydroxide kana potassium hydroxide pane yakakwirira tembiricha uye kumanikidzwa.

3. Etherification: Nhanho inotevera kuiswa kwemapoka ehydroxyethyl pamusana we cellulose. Izvi zvinoitwa kuburikidza ne etherification, iyo inosanganisira kugadzirisa cellulose ne ethylene oxide pamberi pe alkaline catalyst. Iyo dhigirii ye etherification inogona kudzorwa kuti iwane inodiwa zvivakwa senge viscosity, solubility, uye kugadzikana kwekupisa.

4. Neutralization: Mushure me etherification, chigadzirwa chacho hachina kusimba kuti chibvise chero yakasara alkali uye kugadzirisa pH kune yakafanira chiyero chekushandiswa kwayo. Neutralization inogona kuitwa neasidhi yakadai seacetic acid kana citric acid.

5. Kusefa uye kuomeswa: Nhanho yekupedzisira ndeyekusefa uye kuomeswa kweiyo yakanatswa HEC chigadzirwa. Chigadzirwa chacho chinowanzosefa kubvisa chero tsvina yasara uye yobva yaomeswa kune yakakodzera mwando wekuchengetedza uye kutakura.

Pakazere, kunatsiridzwa kweHEC kunosanganisira akatevedzana matanho ekuchenesa uye kugadzirisa iyo cellulose mbishi zvinhu kuti ibudise yemhando yepamusoro, inonyungudika nemvura polima ine chaiyo midziyo yekushandiswa kwayo.