Focus on Cellulose ethers

Maxay yihiin arrimaha saameeya gudbinta iftiinka hydroxypropyl methylcellulose?

Gudbinta iftiinka hydroxypropyl methylcellulose waxaa inta badan saameeya qodobada soo socda:

1. Tayada alaabta ceeriin.

Marka labaad, saamaynta alkalization.

3. Saamiga habka

4. Saamiga dareeraha

5. Saamaynta dhexdhexaadinta

Alaabooyinka qaarkood waa daruuro sida caanaha oo kale ka dib markay dhalaalayaan, qaar caano cad, qaar jaale ah, qaarna waa cad yihiin oo hufan… Mararka qaarkood acetic acid waxay si xun u saameyn kartaa gudbinta iftiinka. Waxaa fiican in la isticmaalo acetic acid ka dib marka la qaso. Saamaynta ugu weyni waa in falcelinta si siman loo kiciyay iyo in saamiga nidaamku uu yahay mid deggan (qalabka qaar ayaa leh qoyaan, waxa ku jirana waa mid aan degganayn, sida dareeraha loo isticmaalo dib-u-warshadaynta). Dhab ahaantii, arrimo badan ayaa saameeya. Haddii qalabku xasiloon yahay, hawl-wadeennadana ay si fiican u tababaran yihiin, wax-soo-saarku waa inuu ahaadaa mid aad u deggan. Gudbinta iftiinka kama badnaan doonto inta u dhexeysa ± 2%, iyo isku-bedelka isku midka ah ee kooxaha beddelka ah waa in si fiican loo xakameeyo. Halkii midnimo laga ahaan lahaa, gudbinta iftiinka hubaal way fiicnaan lahayd.

 

Waxyaabaha saameeya viscosity hydroxypropyl methylcellulose:

Viscosity High-viscosity hydroxypropyl methylcellulose kuma soo saari karo cellulose aad u sarreeya oo keliya iyada oo faaruqinta iyo beddelka nitrogen ee wax soo saarka. Guud ahaan, wax-soo-saarka cellulose-ka-jilicsan ee Shiinaha lama xakamayn karo. Si kastaba ha ahaatee, haddii qalabka cabbiraadda ogsijiinta lagu rakibi karo kiliga, wax-soo-saarka viscosity-kiisa waxa lagu xakamayn karaa si macmal ah.

sameeyey. Intaa waxaa dheer, iyada oo la tixgelinayo xawaaraha beddelka ee nitrogen, way fududahay in la soo saaro alaabooyin badan oo viscosity ah iyada oo aan loo eegin sida hawo-mareenka nidaamka. Dabcan, heerka polymerization ee suufka la safeeyey ayaa sidoo kale muhiim ah. Haddii taasi shaqayn waydo, ka dibna ku samee ururka hydrophobic. Dalka Shiinaha waxaa ka jira wakiilo ururo. Nooca wakiilka ururka ee la dooranayo ayaa saameyn weyn ku leh waxqabadka badeecada ugu dambeysa. Ogsajiinta hadhaaga ah ee ku jirta reactor waxay sababtaa hoos u dhaca unugyada unugyada iyo hoos u dhaca miisaanka kelli, laakiin ogsijiinta hadhaaga ah ayaa xaddidan, ilaa iyo inta unugyadii jabay ay dib isugu xidhmaan, ma adka in la sameeyo viscosity sare. Si kastaba ha ahaatee, heerka qoyaanku wuxuu leeyahay wax badan oo ku saabsan waxa ku jira hydroxypropyl. Warshadaha qaarkood waxay rabaan oo kaliya inay yareeyaan qiimaha iyo qiimaha, laakiin ma rabaan inay kordhiyaan nuxurka hydroxypropyl, markaa tayada ma gaari karto heerka badeecadaha shisheeye ee la midka ah. Heerka haynta biyaha ee badeecadu waxay leedahay xidhiidh weyn oo la leh hydroxypropyl, laakiin sidoo kale waxay go'aamisaa heerka haynta biyaha, saamaynta alkalization, saamiga methyl chloride iyo propylene oxide, xoojinta alkali iyo heerka haynta biyaha ee habka falcelinta oo dhan. Saamiga suufka la safeeyey ayaa go'aaminaya waxqabadka alaabta.


Waqtiga boostada: Mar-29-2023
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