Kusiyana kwePhysicochemical Properties yeHPMC uye HEMC

Gel tembiricha chiratidzo chakakosha che cellulose ether. Aqueous solutions ye cellulose ethers ine thermogelling properties. Sezvo tembiricha inowedzera, viscosity inoramba ichiderera. Kana tembiricha yemhinduro yasvika kune imwe kukosha, iyo cellulose ether mhinduro haisisiri pachena, asi inoumba chena colloid, uye pakupedzisira inorasa viscosity yayo. The gel tembiricha bvunzo inoreva kutanga cellulose ether sampu ine 0.2% yekumisikidza cellulose ether mhinduro uye kuipisa zvishoma nezvishoma mubhavhu remvura kusvikira mhinduro ichiita chena kana chena gel, uye viscosity yarasika zvachose. Tembiricha yemushonga ndiyo tembiricha yegel ye cellulose ether.

Huyero yemethoxy, hydroxypropyl uye HPMC ine imwe pesvedzero pakunyungudika kwemvura, kubata kwemvura, chiitiko chepamusoro uye tembiricha yegel yechigadzirwa. Kazhinji kutaura, HPMC ine yakakwira methoxyl yemukati uye yakaderera hydroxypropyl yemukati ine yakanaka solubility yemvura uye yakanaka pamusoro pekuita basa, asi tembiricha yegel yakaderera: kuwedzera iyo hydroxypropyl yemukati uye kuderedza methoxy yemukati kunogona kuwedzera tembiricha yegel. Nekudaro, yakawandisa hydroxypropyl yemukati inoderedza tembiricha yegel, kunyungudika kwemvura uye chiitiko chepamusoro. Naizvozvo, vanogadzira cellulose ether vanofanirwa kunyatso kudzora zviri mukati meboka kuti vaone kugadzikana kwechigadzirwa.

indasitiri yekuvaka application

HPMC neHEMC vane mabasa akafanana mukuvaka zvinhu. Inogona kushandiswa se dispersant, mvura inochengetedza agent, thickener, binder, etc. Inonyanya kushandiswa mukuumbwa kwesamende dhaka uye gypsum zvigadzirwa. Inoshandiswa mune simende dhaka kuti iwedzere kubatana kwayo uye kushanda kwayo, kuderedza flocculation, kuwedzera viscosity uye shrinkage, uye ine mabasa ekuchengetedza mvura, kuderedza kurasikirwa kwemvura pamusoro pekongiri yepamusoro, kuwedzera simba, kudzivirira kuputika uye mamiriro ekunze emvura inonyungudika munyu, etc. Inoshandiswa zvakanyanya mu simenti, gypsum, dhaka uye zvimwe zvinhu. Inogona kushandiswa semugadziri wekugadzira firimu, thickener, emulsifier uye stabilizer yependi yelatex uye mvura-inonyungudika resin pendi. Iyo ine yakanaka kupfeka kuramba, kufanana uye kunamatira, inovandudza kushushikana kwepasi, acid-base kugadzikana uye kuenderana nesimbi pigment. Nekuda kweiyo yakanaka viscosity yekuchengetedza kugadzikana, inonyanya kukodzera seanoparadzira mune emulsion coatings. Zvose mune zvose, kunyange zvazvo hurongwa huri diki, hunoshanda zvakanaka uye hune huwandu hwakawanda hwekushandisa.

Iyo tembiricha yegel ye cellulose ether inosarudza kugadzikana kwayo kwekupisa mukushandisa. Tembiricha yegel yeHPMC inowanzova pakati pe60 ° C uye 75 ° C, zvichienderana nerudzi, zvemukati zveboka uye maitiro ekugadzira evagadziri vakasiyana. Nekuda kwehunhu hweboka reHEMC, tembiricha yayo yegelation yakakwira, kazhinji iri pamusoro pe80 ° C, saka kugadzikana kwayo pakupisa kwakanyanya kunonzi kuHPMC. Mukushanda kunoshanda, munzvimbo inopisa yekuvaka yezhizha, mvura inobata simba reHEMC ine viscosity yakafanana uye dosage iri nani pane iyo yeHPMC. Kunyanya kumaodzanyemba, dhaka dzimwe nguva rinoshandiswa pakupisa kwakanyanya. Iyo cellulose ether yeiyo yakaderera-kupisa gel icharasikirwa neyakakora uye inochengetedza mvura mhedzisiro pakudziya kwakanyanya, nekudaro ichimhanyisa kuoma kwesamende dhaka uye inokanganisa zvakananga kuvaka uye kutsemuka kuramba.

Nekuti kune akawanda hydrophilic mapoka muchimiro cheHEMC, ine nani hydrophilicity. Mukuwedzera, iyo vertical flow resistance yeHEMC zvakare yakanaka. Iyo yekushandisa mhedzisiro yeHPMC mukunamatira mataira ichave nani.