Te awe o te hydroxypropyl methylcellulose

Ko te Hydroxypropyl methylcellulose e whakawhiwhia ana ki te moata maku me te tino pokey, ka nui ake te kaha ki te hono i waenga i te kumete maku me te paparanga turanga, me te whakapai ake i te mahi anti-sag o te moata. Kei te whakamahia nuitia i roto i te raima moata, te punaha arai taiepa o waho me te here pereki ki roto i te kumete. Ka taea hoki e te hua matotoru o te cellulose ether te whakanui ake i te whakakotahitanga me te aukati i te whakamaaramatanga o nga mea hou i konatunatua ki te raima, te aukati i te delamination, te wehenga me te toto o te kumete me te raima, a ka taea te whakamahi i roto i te raima muka, te raima i raro i te wai me te raima-whaiaro. .

Hydroxypropyl methylcelluloseHPMCka whakanui ake i te pokey o nga mea hanga sima mai i te pokey o te otinga cellulose ether. Ko te tohu o te "pokey" te nuinga o te wa e whakamahia ana hei arotake i te pokey o te otinga cellulose ether. Ko te viscosity o te cellulose ether e tohu ana ki te otinga cellulose ether me te kukū (pērā i te 2%). Te tere (te tere hurihanga ranei, penei i te 20 rpm), te uara pokey i ine ki tetahi taputapu ine kua tohua (pērā i te viscometer huri).

Ko te Viscosity tetahi waahanga nui hei arotake i te mahi o te cellulose ether. Ko te teitei ake o te kaha o te wairewa hydroxypropyl methylcellulose, ko te pai ake o te paheketanga o nga rauemi ciment, ko te pai ake o te whakapiri ki te taputapu, me te pai ake o te kaha ki te aukati me te whakakore i te kaha. He kaha, engari ki te nui rawa tona pokey, ka pa ki te rere me te mahi o nga mea hanga sima (penei i te whakapiri i te maripi raima i te wa e hangai ana te moata). Na reira, ko te 15,000~60,000 mPa te viscosity o te cellulose ether e whakamahia ana i roto i te kumete maroke. Ko te S-1, te moata whakamaarama me te raima whakamaarama-whaiaro, me kaha ake te rere o te wai, me iti ake te pokey o te cellulose ether.

I tua atu, ko te kaha o te kaha o te hydroxypropyl methylcellulose ka nui ake te hiahia o te wai o nga mea e pa ana ki te ciment, na reira ka piki ake te hua o te kumete.

Ko te pokey o nga otinga hydroxypropyl methylcellulose e whakawhirinaki ana ki nga mea e whai ake nei:

Te taumaha ngota (te tohu polymerization ranei) me te kukū o te cellulose ether, te pāmahana otinga, te tere kutikuti me te tikanga whakamatautau.

1. Ko te teitei ake o te polymerization o te cellulose ether me te nui o te taumaha ngota, te teitei ake o te viscosity o tana otinga wai;

2. Ko te teitei ake o te inenga (te kukū ranei) o te cellulose ether, ka nui ake te pokey o tana wairewa wai, engari me tupato ki te whiriwhiri i te inenga e tika ana ina whakamahia ana, kia kore ai e pa ki te mahi o te moata me te raima mena ka he tiketike rawa te inenga;

3. Pērā i te nuinga o ngā wai, ka heke te pōkākā o te otinga cellulose ether i te pikinga o te pāmahana, ā, ka nui ake te kukū o te cellulose ether, ka nui ake te awe o te pāmahana;

4. He pseudoplastic te nuinga o te wairewa ether Cellulose, he ahua whakaheke te kutikuti. Ko te nui ake o te tere kutikuti i te wa o te whakamatautau, ka iti ake te viscosity.

Na reira, ka whakahekehia te whakakotahitanga o te kumete na te kaha o waho, e whai hua ana ki te tarai i te hanga moata, kia pai ai te mahi me te whakakotahitanga o te moata i te wa ano. Heoi, ka whakaatu te wairewa cellulose ether i nga ahuatanga o te wai Newtonian ina he iti te kukū me te iti o te pokey. Ka piki ake te kukū, ka whakaatu haere te wairewa i nga ahuatanga o te wai pseudoplastic, me te teitei ake o te kukū, ka tino kitea te pseudoplasticity.