1. Hunhu hweHPMC mune zvakajairika dhaka
HPMC inonyanya kushandiswa seretarder uye muchengeti wemvura mukuyeresa simende. Muzvikamu zvekongiri uye dhaka, inogona kuvandudza viscosity uye shrinkage rate, kusimbisa simba rakabatana, kudzora simende yekuisa nguva, nekuvandudza simba rekutanga uye static bending simba. Nemhaka yokuti ine basa rekuchengetedza mvura, inogona kuderedza kurasikirwa kwemvura pamusoro pekongiri yepamusoro, kudzivisa kuputika pamucheto, uye kunatsiridza kunamatira uye kushanda kwekuvaka. Kunyanya mukuvaka, nguva yekugadzirisa inogona kuwedzerwa uye kugadziriswa. Nekuwedzera kweHPMC yemukati, nguva yekumisikidza yedhaka ichawedzerwa zvakatevedzana; kunatsiridza machinability uye kupomba, yakakodzera pakuvaka mechan; kunatsiridza kugona kwekuvaka uye kubatsira chivakwa chepamusoro Inodzivirira kubva kumamiriro ekunze emunyu anonyungudika nemvura.
2. Hunhu hweHPMC mune yakakosha dhaka
HPMC inzvimbo yakakwirira-yekuchengetedza mvura yemvura yakaoma poda dhaka, iyo inoderedza kubuda kweropa uye delamination yedhaka uye inovandudza kubatanidzwa kwedhaka. Kunyangwe HPMC ichidzikisa zvishoma kushanduka uye kumanikidza simba redhaka, inogona kuwedzera zvakanyanya kusimba kwesimba uye bond simba redhaka. Uye zvakare, HPMC inogona kunyatso kuvharidzira kuumbwa kwepurasitiki kutsemuka mudhaka uye kuderedza indekisi yepurasitiki yekupwanya yedhaka. Kuchengetwa kwemvura kwedhaka kunowedzera nekuwedzera kweHPMC viscosity, uye kana viscosity inopfuura 100000mPa · s, kuchengetwa kwemvura hakuwedzere zvakanyanya. Iko kunaka kweHPMC kunewo imwe pesvedzero pachiyero chekuchengetedza mvura yedhaka. Kana zvimedu zviri nani, mwero wekuchengetedza mvura yedhaka unovandudzwa. Iyo HPMC particle size inowanzo shandiswa semende dhaka inofanira kuva isingasviki 180 microns (80 mesh screen). Muyero wakakodzera weHPMC mune yakaoma poda dhaka ndeye 1 ‰～3‰.
2.1. Mushure mekunge HPMC iri mudhaka yakanyungudutswa mumvura, kugovera kunoshanda uye kwakafanana kweiyo simende zvinhu muhurongwa kunovimbiswa nekuda kwebasa repamusoro. Sechidziviriro colloid, HPMC "inoputira" zvimedu zvakasimba uye inogadzira dhiri pamusoro pekunze kwayo. Chigadziko chemufirimu wekuzora chinoita kuti sisitimu yevhu igadzikane, uye zvakare inovandudza kuyerera kwedhaka panguva yekusanganiswa uye kutsetseka kwekuvaka.
2.2. Nekuda kwechimiro chayo chemorekuru, mhinduro yeHPMC inoita kuti mvura iri mudhaka isave nyore kurasikirwa, uye inoiburitsa zvishoma nezvishoma kwenguva yakareba, ichipa dhaka nekuchengetedza mvura kwakanaka uye kuvakwa. Inogona kudzivirira mvura kuti irege kuyerera nokukurumidza kubva mudhaka kusvika pachigadziko, kuitira kuti mvura yakachengetwa igare pamusoro pezvinhu zvitsva, izvo zvinogona kukurudzira hydration ye simenti uye kuvandudza simba rekupedzisira. Kunyanya kana iyo interface inosangana nesamende dhaka, plaster, uye adhesive inorasikirwa nemvura, chikamu ichi hachizove chine simba uye chinenge chisina simba rakabatana. Kazhinji kutaura, nzvimbo dzinosangana nezvinhu izvi zvese adsorbents, zvishoma kana zvishoma zvinotora imwe mvura kubva pamusoro, zvichikonzera kusakwana hydration yechikamu ichi, kugadzira simende dhaka uye ceramic mataira substrates uye ceramic mataira kana plaster nemadziro Simba rekubatanidza pakati. nzvimbo inodzikira.
Mukugadzirira kwedhaka, kuchengetwa kwemvura kweHPMC ibasa guru. Zvave zvichiratidzwa kuti kuchengetwa kwemvura kunogona kunge kwakakwira se95%. Kuwedzera kwema molecular huremu hweHPMC uye kuwedzera kwehuwandu hwesimende kuchavandudza kuchengetedza kwemvura uye kusimba kwechisungo chedhaka.
Muenzaniso: Sezvo mataira anonamatira anofanirwa kunge ane simba rechisungo chakakwirira zvose pakati pe substrate nematairi, iyo yakanamatira inobatwa nekushambadza kwemvura kubva kune maviri masosi; iyo substrate (madziro) pamusoro uye mataira. Kunyanya kumatairi, hutano hunosiyana zvakanyanya, vamwe vane pores yakakura, uye matombo ane mvura yakakwirira yekunyura, iyo inoparadza kushanda kwekubatanidza. Iyo inochengetedza mvura mumiririri inonyanya kukosha, uye kuwedzera HPMC kunogona kunyatso kuzadzisa ichi chinodikanwa.
2.3. HPMC yakagadzikana kune asidhi uye alkali, uye mhinduro yayo ine aqueous yakagadzikana muhuwandu hwepH = 2 ~ 12. Caustic soda uye mvura yeraimu haina mhedzisiro pakuita kwayo, asi alkali inogona kukurumidzira kuparara kwayo uye kuwedzera zvishoma viscosity yayo.
2.4. Kuita kwekuvaka kwedhaka rakawedzerwa neHPMC kwakagadziridzwa zvakanyanya. Iyo dhaka inoita se "mafuta", iyo inogona kuita kuti majoini emadziro azere, anotsvedzerera pamusoro, kuita tile kana zvidhinha uye chigadziko chisungo chisungo chakasimba, uye chinogona kurebesa nguva yekushanda, yakakodzera kune yakakura Area kuvaka.
2.5. HPMC isiri-ionic uye isiri-polymeric electrolyte, iyo yakanyatsogadzikana mune aqueous mhinduro nesimbi yemunyu uye organic electrolytes, uye inogona kuwedzerwa kune zvekuvaka kwenguva yakareba kuti ive nechokwadi chekuti kusimba kwayo kwakagadziridzwa.
Nguva yekutumira: Jan-10-2023