1.1Ingaruka za HPMC ku icapiro rya minisiteri yo gucapa 3D
1.1.1Ingaruka ya HPMC kuri extrudability ya 3D icapa
Itsinda ryambaye ubusa M-H0 ridafite HPMC hamwe nitsinda ryibizamini birimo HPMC rifite 0,05%, 0,10%, 0,20%, na 0,30% ryemerewe guhagarara mugihe gitandukanye, hanyuma hapimwa amazi. Birashobora kugaragara ko kwinjiza HPMC Bizagabanya cyane amazi ya minisiteri; iyo ibiri muri HPMC byiyongereye buhoro buhoro kuva kuri 0% bikagera kuri 0,30%, amazi yambere ya minisiteri agabanuka kuva kuri mm 243 kugeza kuri 206, 191, 167, na mm 160. HPMC ni polymer yo hejuru. Bashobora gufatana hamwe kugirango bagire imiterere y'urusobe, kandi guhuza sima ya sima birashobora kwiyongera mugukwirakwiza ibice nka Ca (OH) 2. Macroscopically, ubufatanye bwa minisiteri buratera imbere. Hamwe no kwagura igihe gihagaze, urwego rwa hydration ya minisiteri iriyongera. yiyongereye, amazi yatakaye mugihe. Amazi yitsinda ryuzuye M-H0 adafite HPMC yagabanutse vuba. Mu itsinda ry’ubushakashatsi hamwe 0,05%, 0,10%, 0,20% na 0,30% HPMC, urugero rwo kugabanuka kwamazi yagabanutse igihe, naho amazi ya minisiteri nyuma yo guhagarara muminota 60 yari 180, 177, 164, na 155 mm, . Amazi ni 87.3%, 92.7%, 98.2%, 96.8%. Kwinjiza HPMC birashobora kuzamura cyane ubushobozi bwo kugumana amazi ya minisiteri, biterwa no guhuza HPMC na molekile zamazi; kurundi ruhande, HPMC irashobora gukora firime isa Ifite imiterere y'urusobe kandi igapfunyika sima, igabanya neza ihindagurika ryamazi muri minisiteri kandi ikagira imikorere runaka yo gufata amazi. Birakwiye ko tumenya ko iyo ibiri muri HPMC ari 0,20%, ubushobozi bwo kugumana amazi ya minisiteri bugera kurwego rwo hejuru.
Amazi ya 3D icapura minisiteri ivanze nubunini butandukanye bwa HPMC ni mm 160 ~ 206 mm. Bitewe nibice bitandukanye byicapiro, urwego rusabwa rwamazi yabonetse nabashakashatsi batandukanye aratandukanye, nka mm 150 ~ 190 mm, 160 ~ 170 mm. Kuva ku gishushanyo cya 3, birashobora kugaragara mu buryo bwimbitse Birashobora kugaragara ko amazi ya minisiteri yo gucapa ya 3D ivanze na HPMC ahanini aba ari murwego rwasabwe, cyane cyane iyo HPMC irimo 0,20%, amazi ya minisiteri muminota 60 aba arimo urwego rusabwa, rwujuje ubuziranenge bukwiye kandi buhamye. Kubwibyo, nubwo amazi ya minisiteri afite urugero rwiza rwa HPMC yagabanutse, bigatuma kugabanuka kwa extrudability, iracyafite extrudability nziza, iri murwego rusabwa.
1.1.2Ingaruka ya HPMC kuri stackability ya 3D icapa
Mugihe cyo kudakoresha inyandikorugero, ingano yikigero cyo kugumana imiterere munsi yuburemere-biterwa nubwinshi bwumusaruro wibikoresho, bifitanye isano no guhuza imbere hagati yigituba hamwe. Kugumana imiterere ya 3D icapa minisiteri hamwe nibintu bitandukanye bya HPMC byatanzwe. Igipimo cyimpinduka hamwe nigihe gihagaze. Nyuma yo kongeramo HPMC, igipimo cyo kugumana imiterere ya minisiteri iratera imbere, cyane cyane mugice cyambere kandi gihagaze min 20. Ariko, hamwe no kwongerera igihe gihagaze, ingaruka zo kunoza HPMC ku gipimo cyo kugumana imiterere ya minisiteri yagabanutse buhoro buhoro, ibyo bikaba byaratewe ahanini n’igipimo cyo kugumana cyiyongera cyane. Nyuma yo guhagarara kuminota 60, 0,20% gusa na 0,30% HPMC irashobora kuzamura igipimo cyo kugumana imiterere ya minisiteri.
Ikizamini cyo kurwanya penetration ibisubizo bya 3D icapura minisiteri irimo ibintu bitandukanye bya HPMC byerekanwe ku gishushanyo cya 5. Birashobora kugaragara ku gishushanyo cya 5 ko kurwanya kwinjirira muri rusange kwiyongera hamwe no kwagura igihe gihagaze, ahanini biterwa no gutembera kwa gusebanya mugihe cyo gutunganya sima. Buhoro buhoro byaje guhinduka bikomeye; mu minota 80 yambere, kwinjiza HPMC byongereye imbaraga zo kwinjira, kandi hamwe no kwiyongera kwa HPMC, kurwanya kwinjira byiyongera. Ninini irwanya gucengera, guhindura ibintu bitewe nuburemere bwakoreshejwe Nukurwanya HPMC nini, ibyo bikaba byerekana ko HPMC ishobora kunoza uburyo bwa kare bwo gucapa 3D. Kubera ko hydroxyl na ether bihuza kumurongo wa polymer wa HPMC bihujwe byoroshye namazi binyuze mumigozi ya hydrogène, bigatuma kugabanuka kwamazi gahoro gahoro kandi isano iri hagati yibice byiyongera, imbaraga zo guterana ziriyongera, bityo kurwanya kwinjirira hakiri kare bikaba binini. Nyuma yo guhagarara muminota 80, kubera hydrata ya sima, kurwanya kwitsinda ryitsinda ridafite HPMC ryiyongereye vuba, mugihe kurwanya kwitsinda ryitsinda ryibizamini hamwe na HPMC ryiyongereye Igipimo nticyahindutse cyane kugeza muminota 160 yo guhagarara. Ku bwa Chen n'abandi, ibi biterwa ahanini nuko HPMC ikora firime ikingira hafi ya sima, ikongerera igihe cyo gushiraho; Pourchez n'abandi. ukeka ko ibyo biterwa ahanini na fibre Ibicuruzwa byoroheje bya ether (nka karubasi) cyangwa amatsinda ya metoxyl birashobora gutinza hydrata ya sima mu kubuza ishingwa rya Ca (OH) 2. Twabibutsa ko, mu rwego rwo gukumira iterambere ry’imyigaragambyo yo kwinjira kugira ngo ritagira ingaruka ku guhinduka kw’amazi hejuru y’urugero, Ubu bushakashatsi bwakozwe mu gihe cy’ubushyuhe n’ubushuhe bumwe. Muri rusange, HPMC irashobora kunoza neza uburyo bwo gucapisha 3D icapiro rya 3D mugice cyambere, gutinza coagulation, no kongera igihe cyo gucapura cya 3D icapura.
Icapiro rya minisiteri ya 3D (uburebure bwa 200 mm × ubugari bwa mm 20 mm × uburebure bwa mm 8): Itsinda ryambaye ubusa ridafite HPMC ryarahinduwe cyane, rirasenyuka kandi rifite ibibazo byo kuva amaraso mugihe cyo gucapa igice cya karindwi; Itsinda rya M-H0.20 minisiteri ifite stackability nziza. Nyuma yo gucapa ibice 13, ubugari bwo hejuru ni 16.58 mm, ubugari bwuruhande rwo hasi ni 19,65 mm, naho hejuru-hasi (igipimo cyubugari bwo hejuru hejuru yubugari bwimbere) ni 0.84. Gutandukana kurwego ni bito. Kubwibyo, byagenzuwe no gucapa ko kwinjiza HPMC bishobora guteza imbere cyane icapiro rya minisiteri. Amazi ya Mortar afite extrudability nziza kandi ihagaze kuri mm 160 ~ 170; igipimo cyo kugumana imiterere kiri munsi ya 70% yarahinduwe cyane kandi ntishobora kuzuza ibisabwa.
1.2Ingaruka za HPMC kumiterere ya rheologiya ya 3D yandika
Ubukonje bugaragara bwibibyimba byera munsi yibintu bitandukanye bya HPMC biratangwa: hamwe no kwiyongera kwikigero cyogosha, ubwiza bugaragara bwibishishwa byera buragabanuka, kandi ibintu byo kunanura imisatsi biri munsi ya HPMC. Biragaragara. Urunigi rwa HPMC rudahungabana kandi rwerekana ububobere buke ku gipimo gito; ariko ku gipimo cyinshi cyo hejuru, molekile ya HPMC igenda ibangikanye kandi itondekanye yerekeza ku cyerekezo cyogosha, bigatuma molekile zoroha kunyerera, kumeza rero imbonerahamwe Kugaragara kwijimye ryibishishwa ni bike. Iyo igipimo cyogosha kirenze 5.0 s-1, ubwiza bugaragara bwa P-H0 mumatsinda yubusa burahagaze neza muri 5 Pa s; mugihe ibigaragara bigaragara bya slurry byiyongera nyuma ya HPMC yongeyeho, kandi ivanze na HPMC. Kwiyongera kwa HPMC byongera ubushyamirane bwimbere hagati ya sima ya sima, ibyo bikaba byongera ububobere bugaragara bwa paste, kandi imikorere ya macroscopique nuko extrudability ya 3D icapura 3D igabanuka.
Isano iri hagati yimyitwarire yikariso nigipimo cyogutwara ibishishwa byera mu kizamini cya rheologiya yaranditswe, kandi moderi ya Bingham yakoreshejwe kugirango ihuze ibisubizo. Ibisubizo byerekanwe ku gishushanyo cya 8 no ku mbonerahamwe ya 3. Iyo ibikubiye muri HPMC byari 0,30%, igipimo cyogosha mugihe cyikizamini cyari hejuru ya 32.5 Iyo ubwiza bwibisebe burenze urugero rwibikoresho kuri s-1, amakuru ahuye ingingo ntishobora gukusanywa. Mubisanzwe, agace gakikijwe no kuzamuka no kugwa kumurongo uhamye (10.0 ~ 50.0 s-1) bikoreshwa mukuranga thixotropy yigituba [21, 33]. Thixotropy bivuga imitungo isukuye ifite amazi menshi mugikorwa cyo kogosha imbaraga zo hanze, kandi irashobora gusubira muburyo bwambere nyuma yo guhagarika ibikorwa. Thixotropy ikwiye ningirakamaro cyane kugirango icapwe rya minisiteri. Birashobora kugaragara ku gishushanyo cya 8 ko agace ka thixotropique k'itsinda ryambaye ubusa nta HPMC kari 116.55 Pa / s gusa; nyuma yo kongeramo 0,10% ya HPMC, agace ka thixotropique ya net paste yiyongereye cyane kuri 1 800.38 Pa / s; Hamwe no kwiyongera kwa, thixotropic agace ka paste yagabanutse, ariko yari ikiri hejuru inshuro 10 kurenza iyitsinda ryambaye ubusa. Urebye kuri thixotropy, kwinjiza HPMC byateje imbere cyane icapiro rya minisiteri.
Kugirango minisiteri igumane imiterere yayo nyuma yo kuyikuramo no kwihanganira umutwaro wikurikiranya ryakuweho, minisiteri igomba kugira impungenge nyinshi. Birashobora kugaragara kuva kumeza 3 ko guhangayikishwa numusaruro τ0 ya net slurry byateye imbere cyane nyuma ya HPMC yongeyeho, kandi bisa na HPMC. Ibiri muri HPMC bifitanye isano nziza; iyo ibikubiye muri HPMC ari 0,10%, 0,20%, na 0,30%, impungenge z'umusaruro wa net paste ziyongera kugera kuri 8.6, 23.7, na 31.8 inshuro zirenze izitsinda ryambaye ubusa; plastike viscosity μ nayo yiyongera hamwe no kwiyongera kwibirimo bya HPMC. Icapiro rya 3D risaba ko ububobere bwa plastike bwa minisiteri butagomba kuba buto cyane, bitabaye ibyo guhindura nyuma yo gukuramo bizaba binini; icyarimwe, ubwiza bwa plastike bukwiye bugomba kubungabungwa kugirango habeho guhuza ibikoresho. Muri make, duhereye ku mvugo, Incorporation ya HPMC igira ingaruka nziza mugutezimbere uburyo bwo gucapa 3D. Nyuma yo gushiramo HPMC, paste yera iracyahuza nicyitegererezo cya rheologiya ya Bingham, kandi ibyiza bya R2 ntibikwiye munsi ya 0.99.
1.3Ingaruka ya HPMC kumiterere yubukanishi bwa 3D icapa
28 d imbaraga zo gukomeretsa nimbaraga zoroshye zo gucapa 3D. Hamwe no kwiyongera kwa HPMC, 28 d compressive na flexural imbaraga za 3D icapiro rya 3D ryaragabanutse; iyo ibikubiye muri HPMC bigeze kuri 0,30%, imbaraga za 28 d zo gukomeretsa hamwe nimbaraga za flexural ni 30.3 na 7.3 MPa. Ubushakashatsi bwerekanye ko HPMC ifite ingaruka zimwe zo kwinjiza ikirere, kandi niba ibiyirimo ari byinshi cyane, imbere imbere ya minisiteri iziyongera cyane; Gukwirakwiza gukwirakwiza kwiyongera kandi biragoye gusohora byose. Kubwibyo, kwiyongera kwa porosity bishobora kuba impamvu yo kugabanuka kwimbaraga za 3D icapura minisiteri yatewe na HPMC.
Uburyo budasanzwe bwo gushushanya uburyo bwo gucapura 3D buganisha ku kubaho kw'intege nke mu miterere n'imiterere ya mashini hagati y'ibice byegeranye, kandi imbaraga zo guhuza ibice zifite uruhare runini ku mbaraga rusange yibice byacapwe. Kuri 3D icapiro rya minisiteri ivanze na 0,20% HPMC M-H0.20 yaraciwe, kandi imbaraga zumubano hagati zageragejwe nuburyo bwo gutandukanya interlayer. Imbaraga zihuza imbaraga zingingo eshatu zari hejuru ya 1.3 MPa; kandi iyo umubare wibice wari muke, interlayer ihuza imbaraga yari hejuru gato. Impamvu irashobora kuba nuko, kuruhande rumwe, uburemere bwurwego rwo hejuru bituma ibice byo hasi bihuza cyane; kurundi ruhande, ubuso bwa minisiteri burashobora kugira ubuhehere bwinshi mugihe cyo gucapura urwego rwo hasi, mugihe ubuhehere bwubuso bwa minisiteri bugabanuka kubera guhumeka no guhumeka mugihe cyo gucapa igice cyo hejuru, bityo rero guhuza hagati yurwego rwo hasi birakomera.
1.4Ingaruka za HPMC kuri Micromorphology ya 3D Icapiro Mortar
Amashusho ya SEM yerekana urugero rwa M-H0 na M-H0.20 afite imyaka 3 d yerekana ko imyenge yo hejuru yikigereranyo cya M-H0.20 yiyongereye cyane nyuma yo kongeramo 0,20% HPMC, kandi ubunini bwa pore nini kuruta ubw'ubwa itsinda ryuzuye. Ibi Ku ruhande rumwe, ni ukubera ko HPMC ifite ingaruka zo guhumeka ikirere, itangiza imyenge imwe kandi myiza; kurundi ruhande, birashoboka ko iyongerwaho rya HPMC ryongera ubwiza bwikigina, bityo bikongerera imbaraga zo gusohoka kwumwuka mwimbere imbere. Ubwiyongere bushobora kuba impamvu nyamukuru yo kugabanuka kwimiterere yimashini ya minisiteri. Kurangiza, kugirango tumenye imbaraga za 3D icapura 3D, ibikubiye muri HPMC ntibigomba kuba binini cyane (≤ 0,20%).
Mu gusoza
(1) Hydroxypropyl methylcellulose HPMC itezimbere icapiro rya minisiteri. Hamwe no kwiyongera kwibirimo muri HPMC, extrudability ya minisiteri iragabanuka ariko iracyafite extrudability nziza, stackability iratera imbere, kandi icapwa Igihe ni kirekire. Byagenzuwe no gucapa ko guhindura ibice byo hasi ya minisiteri bigabanuka nyuma yo kongeramo HPMC, naho igipimo cyo hejuru-hasi ni 0.84 mugihe ibirimo HPMC ari 0,20%.
(2) HPMC itezimbere imiterere ya rheologiya ya 3D icapa. Hamwe no kwiyongera kwa HPMC, kugaragara kugaragara kwijimye, gutanga umusaruro hamwe nubusembwa bwa plastike bwiyongera; thixotropy ibanza kwiyongera hanyuma igabanuka, kandi icapiro riraboneka. Gutezimbere. Urebye kuri rheologiya, kongeraho HPMC birashobora kandi kunoza icapiro rya minisiteri. Nyuma yo kongeramo HPMC, gusebanya biracyahuza na moderi ya rheologiya ya Bingham, nibyiza bya R2≥0.99.
(3) Nyuma yo kongeramo HPMC, microstructure hamwe na pore yibikoresho byiyongera. Birasabwa ko ibiri muri HPMC bitagomba kurenga 0,20%, bitabaye ibyo bizagira ingaruka zikomeye kumiterere ya minisiteri. Imbaraga zo guhuza hagati yuburyo butandukanye bwa 3D icapiro ya minisiteri iratandukanye gato, numubare wabyo Iyo ari hasi, imbaraga zubusabane hagati ya minisiteri ni nyinshi.
Igihe cyo kohereza: Nzeri-27-2022