Dab tsi yog cov haujlwm ntawm cov khoom noj muaj pes tsawg leeg ntawm cellulose ether

Piav:

Cov khoom noj muaj xws licellulose ethers

Technical field:

Tam sim no invention muaj feem xyuam rau cov khoom noj uas muaj cellulose ethers.

Cov txheej txheem hauv qab:

Nws tau ntev tau paub los koom nrog cov cellulose ethers rau hauv cov khoom noj khoom haus, tshwj xeeb tshaj yog cov khoom noj khoom haus, los txhim kho ntau yam khoom xws li khov-thaw ruaj khov thiab / lossis kev ntxhib los mos, los yog txhim kho kev ruaj khov thaum lub sij hawm tsim khoom, mechanically processed los yog kib. Daim ntawv thov patent British GB 2 444 020 nthuav tawm cov khoom noj xws li cov khoom noj uas tsis yog-cellulose ether xws li methylcellulose, hydroxypropyl cellulose, lossis hydroxypropyl methylcellulose. Methylcellulose thiab hydroxypropyl methylcellulose muaj "thermos reversible gelling zog". Nws tau piav qhia tshwj xeeb tias thaum cov tshuaj aqueous ntawm methylcellulose los yog hydroxypropyl methylcellulose yog rhuab, pawg hydrophobic methoxy nyob rau hauv lub molecule undergoes lub cev qhuav dej, thiab nws yuav ua ib tug aqueous gel. Ntawm qhov tod tes, thaum lub resulting gel yog txias, cov hydrophobic methoxy pawg yog rehydrated, uas cov gel rov qab mus rau lub qub aqueous tov.

European Patent EP I 171 471 nthuav tawm methylcellulose uas muaj txiaj ntsig zoo hauv cov khoom noj khoom haus xws li zaub, nqaij, thiab taum pauv patties vim tias nws muaj zog gel. Cov methylcellulose muab kev ruaj khov thiab kev sib koom ua ke rau cov khoom noj khoom haus muaj pes tsawg leeg, yog li muab kev pom zoo tom qab rau cov neeg siv khoom noj cov khoom noj uas ua tiav. Thaum yaj 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 muaj pes tsawg leeg, methylcellulose soy ncav cuag nws lub peev xwm los muab cov khoom noj khoom haus zoo nrog kev ruaj khov thiab sib koom ua ke. muaj peev xwm.

Txawm li cas los xij, qee zaum, kev siv dej txias tsis yooj yim rau cov neeg tsim khoom ntawm cov khoom noj muaj pes tsawg leeg. Yog li, nws yuav tsim nyog los muab cov cellulose ethers uas muab cov khoom noj khoom haus sib xyaw nrog zoo hardness thiab cohesion txawm tias cov cellulose ethers yaj hauv dej uas muaj qhov kub thiab txias.

Hydroxyalkyl methylcellulose xws li hydroxypropyl methylcellulose (uas tseem paub tias muaj txiaj ntsig zoo hauv cov khoom noj khoom haus) paub tias muaj cov khoom siv qis qis piv rau methylcellulose. Hydroxyalkyl methylcelluloses nthuav tawm cov khoom siv qis qis tsis tsim cov gels muaj zog. High concentrations yog xav tau rau 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 hydroxyalkyl methylcelluloses xws li hydroxypropyl methylcellulose (uas pom cov khoom siv qis qis) suav nrog hauv cov khoom noj khoom haus, lawv cov tawv tawv thiab kev sib koom ua ke tsis siab txaus rau qee qhov kev siv.

Nws yog ib yam khoom ntawm qhov kev tsim tawm tam sim no los muab hydroxyalkyl methylcellulose, tshwj xeeb tshaj yog hydroxypropyl methylcellulose, uas yog piv rau cov paub hydroxyalkyl methylcellulose, xws li hydroxypropyl methylcellulose Hauv qhov sib piv, cov khoom noj khoom haus muaj cov khoom noj muaj zog thiab / lossis kev sib koom ua ke.

Ib qho khoom nyiam ntawm qhov kev tsim kho tam sim no yog muab hydroxyalkyl methylcellulose, tshwj xeeb tshaj yog hydroxypropyl methylcellulose, uas muab cov khoom noj khoom haus muaj zog nrog zoo hardness thiab / los yog cohesion txawm tias hydroxyalkyl methylcellulose tib yam muaj tseeb thaum yaj hauv dej muaj txog chav tsev kub.

Kuj ceeb tias, nws tau pom tiasHydroxyalkyl methylcellulose yog ib qho khoom noj khoom haus, tshwj xeeb tshaj yog hydroxypropyl methylcellulose, tuaj yeem siv rau hauv kev npaj Piv nrog cov khoom noj khoom haus, paub cov khoom noj khoom haus muaj zog dua thiab / lossis cohesion.

Kuj ceeb tias, nws tau pom tias qee yam hydroxyalkyl methylcelluloses, tshwj xeeb tshaj yog hydroxypropyl methylcellulose, tsis tas yuav tsum tau yaj hauv dej txias kom muab cov khoom noj khoom haus sib xyaw nrog kev ruaj khov thiab / lossis kev sib koom ua ke.