1 Kupu Whakataki
Ko te piripiri tāera sima te whakamahinga nui rawa atu o te moata maroke-whakaranu motuhake i tēnei wā, he mea hanga mai i te sima hei rauemi sima matua, ā, he mea tāpiri atu ki ngā konganuku kua whakarōpūtia, ngā kaihoko pupuri wai, ngā kaihoko kaha wawe, te paura rapa me ētahi atu ranunga tāpiri waro, kore-waro rānei. I te nuinga o te wā, me whakaranu noa ki te wai ina whakamahia. Ki te whakatauritea ki te moata sima noa, ka taea e ia te whakapai ake i te kaha o te hononga i waenga i te rauemi mata me te papa, ā, he pai te ātete ki te paheke me te ātete wai me te wai. Ko te nuinga o te wā ka whakamahia hei whakapiri i ngā rauemi whakapaipai pēnei i ngā pereki pakitara o roto me waho o te whare, ngā pereki papa, me ētahi atu. He whānui te whakamahinga i roto i ngā pakitara o roto me waho, ngā papa, ngā kaukau, ngā kīhini me ētahi atu wāhi whakapaipai whare. Koinei te rauemi hononga tāera e whakamahia whānuitia ana i tēnei wā.
I te nuinga o te wā, ina arotakehia te mahi a te piripiri taera, ehara i te mea ko tōna mahi whakahaere me tōna kaha ārai-paheke anake te mea e arohia ana, engari ko tōna kaha miihini me te wā whakatuwheratanga hoki. Ko te etera cellulose i roto i te piripiri taera ehara i te mea ka pā ki ngā āhuatanga rheological o te piripiri porcelain anake, pērā i te mahi maeneene, te maripi piri, me ētahi atu, engari he kaha te awe ki ngā āhuatanga miihini o te piripiri taera.
2. Te pānga ki te wā whakatuwheratanga o te piripiri taera
Ina noho tahi te paura rapa me te cellulose ether i roto i te moata mākū, e whakaatu ana ētahi tauira raraunga he kaha ake te kaha nekeneke o te paura rapa ki te piri ki ngā hua whakamakuku sima, ā, he nui ake te noho o te cellulose ether i roto i te wai interstitial, ka pā ki te matotoru o te moata me te wā whakatakoto. He teitei ake te kukū o te mata o te cellulose ether i tērā o te paura rapa, ā, ko te nui ake o te whakanui ake i te cellulose ether i te atanga moata ka whai hua ki te hanganga o ngā here hauwai i waenga i te mata turanga me te cellulose ether.
I roto i te moata mākū, ka mimiti te wai i roto i te moata, ā, ka whakanuia te cellulose ether i runga i te mata, ā, ka hangaia he kiriata i runga i te mata o te moata i roto i te 5 meneti, ka whakaiti i te tere mimiti i muri mai, i te mea ka tangohia he wai nui atu i te moata matotoru. Ka heke tetahi wāhanga ki te paparanga moata angiangi, ā, ka rewa te kiriata i hangaia i te tīmatanga, ā, mā te hekenga o te wai ka nui ake te whakanuia o te cellulose ether i runga i te mata o te moata.
Nō reira, he nui te awe o te hanganga kiriata o te cellulose ether i runga i te mata o te moata ki te mahi a te moata. 1) He angiangi rawa te kiriata kua hangaia, ā, ka rua ngā wā ka rewa, kāore e taea te whakawhāiti i te mimiti o te wai, me te whakaiti i te kaha. 2) He matotoru rawa te kiriata kua hangaia, he teitei te kukū o te cellulose ether i roto i te wai waenga o te moata, ā, he teitei te matotoru, nō reira kāore e ngāwari te pakaru o te kiriata mata ina whakapirihia ngā taera. Ka kitea ko ngā āhuatanga hanga kiriata o te cellulose ether he nui ake te pānga ki te wā tuwhera. Ko te momo cellulose ether (HPMC, HEMC, MC, me ētahi atu) me te tohu o te etherification (tohu whakakapinga) e pā tika ana ki ngā āhuatanga hanga kiriata o te cellulose ether, me te pakeke me te pakari o te kiriata.
3. Te awe ki te kaha o te tuhi
Haunga te whakarato i ngā āhuatanga pai kua whakahuatia ake nei ki te moata, ka whakaroahia hoki e te cellulose ether te tere o te whakamakuku o te sima. Ko te take matua o tēnei pānga whakaroa ko te mimiti o ngā ngota cellulose ether ki ngā momo āhua kohuke i roto i te pūnaha sima e whakamakukuhia ana, engari i te nuinga o te wā, ko te whakaaro whānui ko ngā ngota cellulose ether ka mimitihia ki te wai pērā i te CSH me te konupūmā hauwai. Mō ngā hua matū, he onge te mimiti ki te āhua kohuke taketake o te clinker. Hei tāpiri, ka whakaitihia e te cellulose ether te nekenekehanga o ngā katote (Ca2+, SO42-, …) i roto i te wairewa pūwero nā te pikinga o te matotoru o te wairewa pūwero, ā, ka whakaroahia ake te tukanga whakamakuku.
Ko te matotoru tētahi atu tawhā nui, e tohu ana i ngā āhuatanga matū o te cellulose ether. E ai ki te kōrero i runga ake nei, ko te matotoru te mea nui e pā ana ki te kaha pupuri wai, ā, he pānga nui anō hoki ki te kaha mahi o te moata hou. Heoi, kua kitea e ngā rangahau whakamātautau kāore he pānga o te matotoru o te cellulose ether ki te tere o te whakamakuku sima. He iti noa te pānga o te taumaha ngota ki te whakamakuku, ā, ko te rerekētanga mōrahi i waenga i ngā taumaha ngota rerekē he 10 meneti noa iho. Nō reira, ehara te taumaha ngota i te tawhā matua hei whakahaere i te whakamakuku sima.
Ko te whakaroa o te cellulose ether e whakawhirinaki ana ki tōna hanganga matū, ā, ko te whakatau whānui, mō te MHEC, ko te teitei ake o te methylation, ko te iti ake o te pānga whakaroa o te cellulose ether. Hei tāpiri, ko te pānga whakaroa o te whakakapinga hydrophilic (pēnei i te whakakapinga ki te HEC) he kaha ake i te whakakapinga hydrophobic (pēnei i te whakakapinga ki te MH, MHEC, MHPC). Ko te pānga whakaroa o te cellulose ether e pāngia ana e ngā tawhā e rua, te momo me te nui o ngā rōpū whakakapinga.
I kitea hoki i roto i ā mātou whakamātautau pūnaha he mea nui te wāhi o ngā matū whakakapi ki te kaha ā-pūkaha o ngā piri taera. I arotakehia e mātou te mahi a te HPMC me ngā nekehanga rerekē o te whakakapinga i roto i ngā piri taera, ā, i whakamatauria te pānga o ngā etera cellulose kei roto ngā rōpū rerekē i raro i ngā āhuatanga whakamaroke rerekē ki ngā Pānga ki ngā āhuatanga ā-pūkaha o ngā piri taera.
I roto i te whakamātautau, ka whakaarohia e mātou te HPMC, he matū etera, nō reira me hono ngātahi ngā pikitia e rua. Mō te HPMC, me whai taumata mimiti motuhake hei whakarite i tōna wairewatanga wai me te whakawhiti mārama. E mōhio ana mātou ki te ihirangi o ngā matū whakakapi. Mā tēnei hoki ka whakatau i te pāmahana tiēre o te HPMC, e whakatau ana hoki i te taiao whakamahi o te HPMC. Mā tēnei, ko te ihirangi rōpū o te HPMC e whakamahia ana i te nuinga o te wā ka whakatakotoria hoki ki roto i tētahi whānuitanga. I roto i tēnei whānuitanga, me pēhea te whakakotahi i te methoxy me te hydroxypropoxy. Hei whakatutuki i te hua pai rawa atu, ko te ihirangi o tā mātou rangahau. E whakaatu ana te Pikitia 2 i roto i tētahi whānuitanga, ko te pikinga o te ihirangi o ngā rōpū methoxyl ka arahi ki te hekenga o te kaha kukume, ko te pikinga o te ihirangi o ngā rōpū hydroxypropoxyl ka arahi ki te pikinga o te kaha kukume. He rite tonu te pānga mō ngā hāora whakatuwheratanga.
He rite tonu te ia o te huringa o te kaha ā-ringa i raro i te āhua o te wā tuwhera ki tērā i raro i ngā āhua pāmahana noa. He pai te pakari o te kiriata o te HPMC me te ihirangi methoxyl (DS) teitei me te ihirangi hydroxypropoxyl (MS) iti, engari ka pā ki ngā āhuatanga mākū o te rauemi.
Wā tuku: Hanuere-09-2023