Focus on Cellulose ethers

Kua tino mohio koe ki te mahi a te hydroxypropyl starch ether (HPS) ki te kumete?

Starch ether he kupu whanui mo te karaehe o nga maaka kua whakarereketia kei roto nga here ether i roto i te ngota ngota, e mohiotia ana ko te maaka etherified, e whakamahia nuitia ana i roto i te rongoa, te kai, te kakano, te hanga pepa, te matū o ia ra, te hinu me etahi atu ahumahi. I tenei ra ka whakamaramatia e matou te mahi a te maaka ether i roto i te kumete.

He kupu whakataki ki te Starch Ether

Ko nga mea e whakamahia nuitia ana ko te maaka rīwai, te māngaro tapioka, te māngaro kānga, te māngaro witi, me ētahi atu. Ki te whakaritea ki te māngaro pata he nui ake te ngako me te pūmua, he parakore te māngaro hua pakiaka pērā i te rīwai me te māngaro tapioka.

Ko te māngaro he pūhui macromolecular polysaccharide i titoa ki te kūhuka. E rua nga momo ngota ngota, raina me te peka, e kiia ana ko te amylose (mo te 20%) me te amylopectin (mo te 80%). Hei whakapai ake i nga ahuatanga o te maaka e whakamahia ana i roto i nga rawa hanga whare, ka taea te whakamahi tikanga tinana me te matū ki te whakarereke kia pai ake ai ona taonga mo nga kaupapa rereke o nga taonga hanga.

He maha nga momo hua kei roto i te māngaro whakaeterera. Pērā i te carboxymethyl starch ether (CMS), hydroxypropyl starch ether (HPS), hydroxyethyl starch ether (HES), cationic starch ether, etc. Hydroxypropyl starch ether e whakamahia ana.

Ko te mahi a te hydroxypropyl starch ether i roto i te kumete

1) Whakanuia te kumete, whakanuia nga ahuatanga anti-sagging, anti-sagging me te rheological o te moata

Hei tauira, i roto i te hanga o te whakapiri tira, te putty, me te raima raima, ina koa ko te rehu miihini e hiahia ana kia nui te rere o te wai, penei i roto i te moata gypsum-based, he mea tino nui (he nui te rere o te wai ki te miihini, engari ka tino paheke. , ka taea e Etera te whakaea mo tenei ngoikoretanga).

He maha nga taupatupatutanga o te wai me te atete sag, a, ka nui ake te rere o te wai, ka heke te parenga sag. Ka taea e te kumete me nga ahuatanga rheological te whakaoti i te whakahētanga pera, ara, ka tukuna he kaha o waho, ka heke te viscosity, te whakarei ake i te mahi me te papu, a ka unuhia te kaha o waho, ka piki te pokey ka pai ake te aukati.

Mo te ahua o naianei o te piki haere o te waahi tira, ko te taapiri i te maaka ether ka taea te whakapai ake i te aukati paheketanga o te whakapiri tira.

2) Nga haora whakatuwheratanga roa

Mo nga taapiri taera, ka taea e ia te whakatutuki i nga whakaritenga o nga taputapu taarai motuhake (Class E, 20min te roa ki te 30min kia tae ki te 0.5MPa) e whakawhānui ana i te wa whakatuwhera.

Kua pai ake nga ahuatanga o te mata

Ka taea e te maaka ether te hanga i te mata o te turanga gypsum me te kumete ciment kia maeneene, he ngawari ki te tono, he pai te whakapaipai. He tino whai kiko mo te raima moata me te moata whakapaipai paparanga angiangi penei i te putty.

Te tikanga o te mahi a te hydroxypropyl starch ether

Ka memeha te ether māngaro i roto i te wai, ka marara rite i roto i te punaha moata sima. Mai i te mea he hanganga whatunga te ngota ether maaka, he kino te utu, ka mimiti i nga matūriki ciment pai ki te utu me te mahi hei piriti whakawhiti ki te hono sima, na reira ka hoatu Ko te uara hua nui o te slurry ka taea te whakapai ake i te anti-sag or anti-slip. pānga.

Ko te rereketanga i waenga i te hydroxypropyl starch ether me te cellulose ether

1. Ka taea e te maaka ether te whakapai ake i nga ahuatanga anti-sag me te anti-slip o te kumete

I te nuinga o te wa ka taea e te cellulose ether anake te whakapai ake i te pokey me te pupuri wai o te punaha engari kaore e taea te whakapai ake i nga taonga aukati me te paheke.

2. Te matotoru me te pokey

Ko te tikanga, ko te pokey o te cellulose ether e tata ana ki te tekau mano, i te mea ko te pokey o te starch ether he maha rau ki te maha mano, engari ehara tenei i te mea he kaha te kaha o te starch ether ki te uru ki te hau, engari ko te starch ether kaore he taonga e uru ana ki te hau. .

5. Hanganga ngota o te cellulose ether

Ahakoa ko te māngaro me te cellulose he momo ngota ngota huka, he rereke nga tikanga hanga. He rite tonu te takotoranga o nga ngota ngota ngota huka katoa i roto i te maaka, engari ko te tuunga o te cellulose he rereke noa, a ko te tuunga o ia ngota ngota huka e tata ana he rereke. Ko tenei rereketanga o te hanganga ka whakatau i te rereketanga o nga ahuatanga o te cellulose me te maaka.


Wā tuku: Apr-10-2023
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