HPMC (Hydroxypropyl Methyl Cellulose) chinhu chepolymer chinowanzo shandiswa mukuvaka, kunyanya mune simende-based zvinhu uye gypsum-based materials. Iyo ine yakanaka solubility yemvura, adhesion, kuchengetedza mvura uye thickening zvivakwa, saka inoshandiswa zvakanyanya mudhaka, putty poda, tile inonamira uye zvimwe zvinhu.
1. Zvinokonzera kuderera uye kuputika kwezvinhu zvekuvaka
Munguva yekuomeswa kwemaitiro, zvivakwa zvekuvaka zvinowanzo kuderera muhukuru nekuda kwekubuda kwemvura, kuita kwemakemikari uye shanduko yekunze kwezvakatipoteredza zvinhu, zvichikonzera kushushikana kwekufunga uye kutsemuka kuumbwa. Mhando huru dze shrinkage dzinosanganisira:
Plastic shrinkage: Kana iyo simende-yakavakirwa zvinhu isati yaoma, vhoriyamu inodzikira nekuda kwekukurumidza kubuda kwemvura.
Dry shrinkage: Mushure mokunge zvinhu zvaoma, zvinoratidzwa kumhepo kwenguva yakareba, uye mvura inoputika zvishoma nezvishoma, zvichiita kuti vhoriyamu iwedzere.
Temperature shrinkage: Kuchinja kwevhoriyamu kunokonzerwa nekushanduka kwetembiricha, kunyanya munzvimbo ine musiyano mukuru wetembiricha pakati pemasikati neusiku.
Autogenous shrinkage: Munguva ye simenti hydration process, iyo yemukati vhoriyamu inoderera nekuda kwekushandiswa kwemvura neiyo hydration reaction.
Aya shrinkages anowanzo tungamira mukushushikana kuunganidzwa mukati mezvinyorwa, pakupedzisira zvichikonzera microcracks kana kuputika, izvo zvinokanganisa kusimba uye aesthetics yechivako chimiro. Kuti udzivise chiitiko ichi, zvekuwedzera zvinowanzodiwa kuti uvandudze mashandiro echinyorwa, uye HPMC ndeimwe yacho.
2. Mechanism yekuita kweHPMC
HPMC inoita basa rakakosha mukudzikisa kudonha uye kuputika kwezvinhu zvekuvaka, izvo zvinonyanya kuwanikwa kuburikidza neanotevera maitiro:
Kuchengetedzwa kwemvura: HPMC ine simba rekuchengetedza mvura uye inogona kugadzira firimu rekuchengetedza mvura mudhaka kana putty poda kuti inonoke kuyerera kwemvura. Sezvo kukurumidza kubuda kwemvura mukati mechinhu kuchizokonzera kupera kwepurasitiki, iyo yekuchengetedza mvura mhedzisiro yeHPMC inogona kunyatso kudzikisa yekutanga shrinkage phenomenon, kuchengetedza mvura iri muzvinyorwa zvakakwana, nekudaro ichisimudzira iyo yakazara hydration reaction ye simenti uye kuderedza shrinkage kutsemuka kunokonzerwa ne kurasikirwa kwemvura panguva yekuomesa. Mukuwedzera, HPMC inogona kuvandudza kushanda kwezvinhu pasi pemvura uye yakaoma mamiriro uye kuderedza kuputika kunokonzerwa nekurasikirwa kwemvura.
Kuwedzera uye kusimbisa mhedzisiro: HPMC ndeye thickener iyo inogona zvinobudirira kuwedzera kuwirirana uye viscosity yedhaka uye kuwedzera kubatanidzwa kwese kwechinhu. Munguva yekuvaka, kana zvinhu zvacho zvakatetepa, zviri nyore kudonhedza kana kusagika, zvichikonzera kusaenzana kwepamusoro kana kutsemuka. Nekushandisa HPMC, dhaka rinogona kuchengetedza viscosity yakakodzera, kuwedzera simba uye kusimba kwepamusoro kwechinhu mushure mekuvaka, uye kuderedza mukana wekutsemuka. Uye zvakare, HPMC inogona zvakare kukwidziridza iyo shear kuramba kwechinhu uye kugadzirisa kwayo kutsemuka kuramba.
Kuvandudza kuchinjika kwezvinhu: HPMC mamorekuru anogona kuita rimwe basa mukusimudzira kuchinjika mune simende-yakavakirwa zvinhu kana gypsum-based zvinhu, kuitira kuti zvinhu zvive nani tensile uye kukotama kuramba mushure mekurapa. Sezvo zvivakwa zvekuvaka zvinowanzoiswa pasi pekunetseka kana kupfugama pasi pekuchinja kwekushisa uye mitoro, mushure mekuwedzera HPMC, kuchinjika kwezvinhu kunowedzera, izvo zvinogona kutora zvirinani kushushikana kwekunze uye kudzivirira brittle kuputika.
Dzora iyo simenti hydration reaction rate: Mune simende-yakavakirwa zvinhu, kumhanya kweiyo hydration reaction rate inokanganisa zvakananga kuita kwechinhu. Kana iyo hydration reaction yakakurumidza, kushushikana mukati mezvinyorwa hakugone kuburitswa nenguva, zvichikonzera kuputika. HPMC inogona kudzikamisa zvakafanira mwero we hydration reaction kuburikidza nekuchengetedza kwayo mvura uye inodzivirira firimu kuumbwa, kudzivirira simende kubva pakurasikirwa nemvura nekukurumidza padanho rekutanga, uye nekudaro kudzivirira chiitiko chekuzvimba shrinkage uye kuputika panguva yekuomeswa kwezvinhu.
Kuvandudza mashandiro ekuvaka: HPMC inogona kuvandudza mashandiro ekuvaka ezvivakwa zvekuvaka, zvinonyanya kuratidzwa mukuyerera kwayo kwakanaka, kuchengetwa kwemvura uye lubricity, kuwedzera kufanana kwezvinhu, uye kuderedza kutsemuka kunokonzerwa nekuvakwa kusina kunaka. Inogona kuita kuti dhaka, putty powder, nezvimwewo zvive nyore kupararira uye kuenzana panguva yekuvaka, kuderedza chiyero chekushaya kwezvinhu, kuvandudza huwandu hwese uye kusimba kwezvinhu, uye kuderedza njodzi yekutsemuka kwenzvimbo kunokonzerwa nekuvakwa kusina kuenzana.
3. Kushandiswa kweHPMC mune chaiyo yekuvakisa zvinhu
Tile inonamira: HPMC inogona kuvandudza zvakanyanya anti-kutsvedza kuita kwetaira adhesive, kuve nechokwadi chekuti matiles anogona kusungirirwa zvakaenzana kune substrate panguva yekuisa, uye kuderedza kudurura kana kuputika kunokonzerwa nekusawirirana kusagadzikana kana shrinkage. Pamusoro pezvo, kukora uye kuchengetedza mvura mhedzisiro yeHPMC inogonesawo kunamatira mataira kuchengetedza yakavhurika nguva yakareba mushure mekuvaka, kunatsiridza kugona kwekuvaka, uye kuderedza kutsemuka kunokonzerwa nekusaenzana kurapa.
Putty poda: Mu putty powder, mvura yekuchengetedza pfuma yeHPMC inogona kudzivirira iyo putty kubva pakurasikirwa nemvura nekukurumidza panguva yekuomesa, uye kuderedza shrinkage uye kuputika kunokonzerwa nekurasikirwa kwemvura. Panguva imwecheteyo, iyo thickening mhedzisiro yeHPMC inogona kuvandudza mashandiro ekuvaka kweputty, zvichiita kuti zvive nyore kuisa zvakaenzana pamadziro, uye kuderedza kutsemuka kwepasi kunokonzerwa nekusaenzana kwekushandisa.
Dheka: Kuwedzera HPMC kudhaka kunogona kunyatso kuvandudza kushanda kwayo, kuita kuti dhaka rive rakatsetseka panguva yekuvaka, kuderedza kupatsanurwa uye stratification, uye nekudaro kunatsiridza kufanana uye kunamatira kwedhaka. Panguva imwecheteyo, kuchengetedza kwemvura kweHPMC kunogona kuita kuti mvura iwedzere zvishoma nezvishoma panguva yekuoma kwedhaka, kudzivisa kuderera uye kuputika kunokonzerwa nekutanga kurasikirwa kwemvura.
4. Chengetedzo yekushandiswa kweHPMC
Dosage control: Huwandu hweHPMC hwakawedzerwa hune mhedzisiro yakananga pakuita kwayo, uye kazhinji inoda kugadziridzwa zvinoenderana nereshiyo yezvinyorwa uye chaiwo mamiriro ekushandisa. Yakawandisa HPMC ichaita kuti zvinhu zvive zvakanyanya kuenderana, zvichikanganisa kuita kwekuvaka; nepo HPMC isina kukwana haizokwanisi kutamba basa rekuchengetedza mvura uye kukora sezvazvinofanira.
Shandisa pamwe nezvimwe zvinowedzera: HPMC inowanzoshandiswa pamwe chete nemamwe makemikari ekuwedzera (akadai semvura inoderedza, air etraining agents, plasticizers, nezvimwewo) kuti uwane migumisiro iri nani. Paunenge uchishandisa, zvinodikanwa kufunga nezvekudyidzana kwezvinowedzera zvakasiyana kuti udzivise kupindirana kwekuita kwezvishandiso.
Sekuwedzera kwakakosha kwekuvaka, HPMC ine mhedzisiro yakakosha mukudzikisa kuderera uye kuputika kwezvinhu zvekuvaka. Iyo inonyatso kudzikisa kuputika kunokonzerwa nekurasikirwa kwemvura uye kushushikana kwekushushikana nekuvandudza kuchengetwa kwemvura, kukora, kuchinjika kwezvinhu uye kuvandudza simende hydration reaction rate. Kushandisa zvine musoro kweHPMC hakungogone kuvandudza mashandiro ekuvaka kwezvinhu, asi zvakare kuwedzera hupenyu hwesevhisi yechivakwa chekuvaka uye kuderedza mutengo wekugadzirisa gare gare. Nekuenderera mberi kwekufambira mberi kwehunyanzvi hwekuvaka, kushandiswa kweHPMC mundima yekuvaka kuchave kwakawedzera uye kwakadzama.
Nguva yekutumira: Sep-21-2024