Cov haujlwm ntawm cov khoom noj khoom haus ntawm cellulose ether yog dab tsi?

Piav qhia:

Cov khoom noj muaj xws licov cellulose ethers

Kev Tshawb Fawb:

Daim ntawv tsim kho tshiab no hais txog cov khoom noj uas muaj cov cellulose ethers.

Cov txheej txheem keeb kwm yav dhau los:

Nws tau paub ntev los lawm tias nws tau muab cov cellulose ethers rau hauv cov khoom noj khoom haus, tshwj xeeb tshaj yog cov khoom noj khoom haus ua tiav, los txhim kho ntau yam khoom xws li kev khov-thaw ruaj khov thiab / lossis cov qauv, lossis txhim kho kev ruaj khov thaum lub sijhawm tsim khoom, ua tiav los ntawm tshuab lossis kib. Daim ntawv thov patent Askiv GB 2 444 020 qhia txog cov khoom noj khoom haus no uas muaj cov cellulose ether nonionic xws li methylcellulose, hydroxypropyl cellulose, lossis hydroxypropyl methylcellulose. Methylcellulose thiab hydroxypropyl methylcellulose muaj "thermos reversible gelling properties". Nws tau piav qhia tshwj xeeb tias thaum cov kua dej ntawm methylcellulose lossis hydroxypropyl methylcellulose raug cua sov, pawg hydrophobic methoxy nyob hauv lub molecule raug dehydration, thiab nws dhau los ua cov kua dej. Ntawm qhov tod tes, thaum cov gel tshwm sim txias, cov pawg hydrophobic methoxy raug rov ua kom dej, uas cov gel rov qab mus rau cov kua dej qub.

European Patent EP I 171 471 qhia txog methylcellulose uas muaj txiaj ntsig zoo rau cov khoom noj khov xws li cov zaub khov, nqaij, thiab taum pauv vim nws lub zog gel nce ntxiv. Cov methylcellulose muab kev ruaj khov thiab kev sib koom ua ke rau cov khoom noj khov, yog li muab kev xav zoo rau cov neeg siv khoom noj cov khoom noj ua tiav. Thaum yaj rau hauv dej txias (piv txwv li, 5 ° C lossis qis dua) ua ntej lossis tom qab sib xyaw nrog lwm cov khoom xyaw ntawm cov khoom noj, cov taum pauv methylcellulose ncav cuag nws lub peev xwm tag nrho los muab cov khoom noj khov nrog kev ruaj khov thiab kev sib koom ua ke zoo. muaj peev xwm.

Txawm li cas los xij, qee zaum, kev siv dej txias tsis yooj yim rau tus neeg tsim cov khoom noj. Yog li ntawd, nws yuav tsum tau muab cov cellulose ethers uas muab cov khoom noj khov kho nrog qhov tawv thiab sib xyaw zoo txawm tias thaum cov cellulose ethers yaj hauv dej uas muaj qhov kub li chav tsev.

Hydroxyalkyl methylcellulose xws li hydroxypropyl methylcellulose (uas kuj paub tias muaj txiaj ntsig zoo rau cov khoom noj) paub tias muaj qhov modulus cia qis dua piv rau methylcellulose. Hydroxyalkyl methylcelluloses uas qhia txog qhov modulus cia qis tsis tsim cov gels muaj zog. Yuav tsum muaj cov concentration siab rau txawm tias cov gels tsis muaj zog (Haque, A; Richardson; Morris, ER, Gidley, MJ thiab Caswell, DC hauv Carbohydrate Polymers22 (1993) p.175; thiab Haque, A thiab Morris, ER1nCarbohydrate Polymers22 (1993) p.161).

Thaum cov hydroxyalkyl methylcelluloses xws li hydroxypropyl methylcellulose (uas qhia txog qhov modulus khaws cia qis) suav nrog hauv cov khoom noj khov, lawv qhov nyuaj thiab kev sib koom ua ke tsis siab txaus rau qee qhov kev siv.

Lub hom phiaj ntawm qhov kev tsim kho tshiab no yog los muab hydroxyalkyl methylcellulose, tshwj xeeb tshaj yog hydroxypropyl methylcellulose, uas zoo ib yam li cov hydroxyalkyl methylcelluloses uas paub zoo, xws li hydroxypropyl methylcellulose. Qhov sib txawv, cov khoom noj khov kho tau muab nrog kev ruaj khov thiab / lossis kev sib koom ua ke zoo dua.

Lub hom phiaj zoo tshaj plaws ntawm qhov kev tsim kho tshiab no yog muab hydroxyalkyl methylcellulose, tshwj xeeb tshaj yog hydroxypropyl methylcellulose, uas muab cov khoom noj khov kho nrog qhov nyuaj thiab / lossis kev sib koom ua ke txawm tias thaum hydroxyalkyl methylcellulose yaj hauv dej uas muaj qhov kub li chav tsev.

Qhov xav tsis thoob, nws tau pom tiashydroxyalkyl methylcellulose, tshwj xeeb tshaj yog hydroxypropyl methylcellulose, tuaj yeem siv rau hauv kev npaj ntawm Piv nrog cov khoom noj khov kho, cov khoom noj khov kho paub tias muaj qhov nyuaj thiab / lossis cohesion siab dua.

Kuj tseem xav tsis thoob tias, nws tau pom tias qee cov hydroxyalkyl methylcelluloses, tshwj xeeb tshaj yog hydroxypropyl methylcellulose, tsis tas yuav yaj rau hauv dej txias kom muab cov khoom noj khov kho nrog kev ruaj khov thiab / lossis kev sib koom ua ke zoo.