Focus on Cellulose ethers

He aha te rereketanga o te hydroxypropyl methylcellulose me te carboxymethylcellulose

Carboxymethyl cellulose CMC, konutai carboxymethyl māngaro (CMS), he iti noa te utu (mai i te mahi o te hua ake, ko te CMC he iti iho i te Fuying HPMC), ka whakamahia te carboxymethyl cellulose mo te paura putty iti mo nga pakitara o roto. , he kino ake te pupuri me te pumau o te wai i tera o te hydroxypropyl methylcellulose, na reira kaore e taea te whakamahi i roto i te putty parewai me te whakauru whakamaroke waiariki o waho.

He maha nga tangata e whakaaro ana he kawakore enei cellulose, he kawakore ano hoki te ciment me te kotakota konupūmā paura, me te whakaaro ka taea te whakamahi i te whakakotahitanga, engari ko te carboxymethyl cellulose me te konutai carboxymethyl starch ehara i te mea kotahi, me te waikawa chloroacetic e whakamahia ana i roto i ta raatau mahi whakaputa. He waikawa, a ko nga toenga matū i roto i te mahi o te hanga cellulose ka tauhohe ki te sima me te kotakota konupūmā paura, no reira e kore e taea te whakakotahi. He maha nga kaihanga kua pa ki te mate nui na tenei, na reira me aro nui. Ko nga whakamahinga o te carboxymethyl cellulose me te hydroxypropyl methyl cellulose he rite noa, engari he tino rereke o raatau mahi, a, ko nga tohu hangarau o te rua kei tawhiti. Ko nga mea matua o nga mea e rua he miro parakore ano, engari he rereke o raatau taonga awhina, taputapu whakaputa, me te rere o te tukanga. Ko nga taputapu hanga me te tukanga o te hydroxypropyl methylcellulose he tino uaua. Ko nga mea e rua ehara i te mahi whakaputa, he rereke ano etahi atu taputapu, na reira he rereke nga whakamahinga. Kaore e taea te whakakapi, kaore e taea te whakakotahi tetahi ki tetahi hei whakaiti i nga utu.

Ko te Hydroxypropyl methylcellulose (hpmc) he matū pūmau, he ātete ki te koriri, he pai ake te pupuri i te wai me te hua matotoru, kaore e pa ki nga huringa pH. Ko te viscosity o te 100,000 he pai mo te paura putty, me te viscosity o 150,000 ki te 200,000 he pai mo te paura putty. I roto i te kumete, te nuinga o te whakanui ake i te taumata o nga rawa me te hanga, ka taea te whakaiti i te nui o te sima.

Ko te mahi ko te moata ciment he wa whakakoi, a me mau tonu i roto i te waa whakakoi, me tuku ki te wai kia makuku. Na te kaha o te pupuri i te wai o te cellulose, ko te wai e hiahiatia ana mo te whakakoi moata sima ka whakamanahia mai i te pupuri wai o te cellulose, na reira ka taea te whakatutuki i te mana whakakoi me te kore tiaki.


Te wa tuku: Apr-21-2023
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