Chizindikiritso chamtundu wa cellulose ether

Cellulose ether ndi polima wopangidwa kuchokera ku cellulose wachilengedwe kudzera mukusintha kwamankhwala.Cellulose ether ndi chochokera ku cellulose yachilengedwe.Kupanga kwa cellulose ether ndikosiyana ndi ma polima opangira.Zinthu zake zofunika kwambiri ndi cellulose, gulu lachilengedwe la polima.Chifukwa cha mawonekedwe achilengedwe a cellulose, cellulose palokha sangathe kuchitapo kanthu ndi etherification agents.Komabe, pambuyo pochiza chotupa chotupa, zomangira zamphamvu za haidrojeni pakati pa unyolo wa maselo ndi unyolo zimawonongeka, ndipo kutulutsidwa kogwira kwa gulu la hydroxyl kumakhala cellulose yotakata.Pezani cellulose ether.

Makhalidwe a cellulose ethers amadalira mtundu, chiwerengero ndi kugawa kwa zolowa m'malo.Magulu a cellulose ether amagawidwanso molingana ndi mtundu wa cholowa m'malo, digiri ya etherification, solubility ndi ntchito zofananira.Malinga ndi mtundu wa zolowa m'malo pa unyolo wa maselo, imatha kugawidwa kukhala monoether ndi ether wosakanikirana.MC yomwe timagwiritsa ntchito nthawi zambiri ndi monoether, ndipo HPMC ndi ether yosakanikirana.Methyl cellulose ether MC ndi chinthu chopangidwa pambuyo poti gulu la hydroxyl pagawo la shuga la cellulose wachilengedwe lilowe m'malo ndi methoxy.Ndi chinthu chopezedwa polowa m'malo mwa gulu la hydroxyl pagawo ndi gulu la methoxy ndi gawo lina ndi gulu la hydroxypropyl.Mapangidwe ake ndi [C6H7O2(OH)3-mn(OCH3)m[OCH2CH(OH)CH3]n]x Hydroxyethyl methyl cellulose ether HEMC, iyi ndi mitundu ikuluikulu yomwe imagwiritsidwa ntchito kwambiri ndikugulitsidwa pamsika.

Pankhani ya solubility, imatha kugawidwa kukhala ionic ndi non-ionic.Ma etha osungunuka m'madzi omwe si a ionic cellulose amapangidwa makamaka ndi ma alkyl ethers ndi ma hydroxyalkyl ethers.Ionic CMC imagwiritsidwa ntchito makamaka mu zotsukira zopangira, kusindikiza nsalu ndi utoto, kufufuza zakudya ndi mafuta.Non-ionic MC, HPMC, HEMC, etc. amagwiritsidwa ntchito makamaka muzomangamanga, zokutira latex, mankhwala, mankhwala tsiku ndi tsiku, etc. Amagwiritsidwa ntchito ngati thickener, madzi kusunga wothandizira, stabilizer, dispersant ndi filimu kupanga wothandizira.

Chizindikiritso chaubwino wa cellulose ether:

Zotsatira za methoxyl pamtundu: kusunga madzi ndi kukhuthala

Chikoka chamtundu wa hydroxyethoxyl/hydroxypropoxyl: kuchuluka kwa zomwe zili, kumapangitsa kuti madzi asungidwe bwino.

Chikoka cha mamasukidwe akayendedwe khalidwe: apamwamba mlingo wa polymerization, apamwamba mamasukidwe akayendedwe ndi bwino madzi posungira.

Chikoka cha fineness khalidwe: bwino kubalalitsidwa ndi kusungunuka mu matope, mofulumira ndi yunifolomu kwambiri, ndipo wachibale kusunga madzi ndi bwino.

Ubwino wa kufalikira kwa kuwala: kuchuluka kwa ma polymerization kumakwera, kuchuluka kwa ma polymerization kumafanana, komanso zonyansa zochepa.

Mphamvu ya kutentha kwa gel: kutentha kwa gel opangira kumangirira pafupifupi 75 ° C

Mphamvu yamadzi: <5%, cellulose ether ndiyosavuta kuyamwa chinyezi, chifukwa chake iyenera kusindikizidwa ndikusungidwa.

Mphamvu yamtundu wa Phulusa: <3%, phulusa limakhala lalitali, zonyansa zambiri

Kukhudzika kwa mtengo wa PH: pafupi ndi ndale, cellulose ether imakhala yokhazikika pakati pa PH: 2-11