Kusanganiswa kwakadzika, uko kunoita basa guru mukuvandudza mashandiro ekuvaka dhaka rakasanganiswa nemvura, kunodarika 40% yemutengo wezvinhu mudhaka rakasanganiswa nemvura. Zvizhinji zvezvisanganiswa mumusika wemumba zvinopihwa nevagadziri vekunze, uye chiyero chezvigadzirwa chinopihwawo nevanotengesa. Mutengo wedhaka rakasanganiswa nemvura unoramba wakakwira, uye zvakaoma kufadza dhaka rakajairika rekugadzira nekuisa plaster nehuwandu hwakawanda uye hwakasiyana-siyana. Zvigadzirwa zvepamusoro-soro zvinodzorwa nemakambani ekunze, uye vagadziri vedhaka rakasanganiswa nemvura vane purofiti yakaderera uye mutengo wakaderera; kushandiswa kwezvisanganiswa hakutsvagirwi nenzira yakarongeka uye yakanangana, uye kunotevera mafomura ekunze zvisina kujeka. Pano, chatinogovana nemi ndechekuti, basa rehydroxypropyl methylcellulose nderei muzvisanganiswa zvakajairika zvedhaka rakasanganiswa nemvura?
Hydroxypropyl methylcellulose imhando ye cellulose ine kugadzirwa kwayo uye kushandiswa kwayo kwave kuwedzera nekukurumidza mumakore achangopfuura. Hydroxypropyl methylcellulose inogadzirwa nedonje rakanatswa mushure mekugadzirisa alkali, ichishandisa propylene oxide nemethyl chloride se etherification agents, iyo non-ionic cellulose mixed ether inogadzirwa kuburikidza nematanho akasiyana-siyana. Dhigirii rekutsiva rinowanzova 1.2 ~ 2.0. Hunhu hwayo hwakasiyana zvichienderana nehuwandu hwe methoxyl uye hydroxypropyl. Hunhu hwe hydroxypropyl methylcellulose ndehwekuti:
1. Hydroxypropyl methylcellulose inonyungudika nyore nyore mumvura inotonhora, uye inosangana nematambudziko pakunyungudika mumvura inopisa. Asi tembiricha yayo ye gelation mumvura inopisa yakakwira zvakanyanya kupfuura yemethyl cellulose. Kunyungudika mumvura inotonhora kwakawedzerawo zvikuru kana tichienzanisa nemethyl cellulose.
2. Kuwanda kwe hydroxypropyl methylcellulose kwakabatana nehuremu hwayo hwemamorekuru. Kukura kwehuremu hwemamorekuru, ndiko kuwedzera kwehuremu. Kupisa kunokanganisawo kusimba kwayo, sezvo tembiricha ichiwedzera, kusimba kwayo kunoderera. Zvisinei, simba rekuwedzera kusimba kwayo uye tembiricha yakaderera pane ye methyl cellulose. Mhinduro yayo inogara yakagadzikana kana yakachengetwa patembiricha yemumba.
3. Kuchengetwa kwemvura kwehydroxypropyl methylcellulose kunoenderana nehuwandu hwayo hwekuwedzera, viscosity, nezvimwewo, uye mwero wayo wekuchengetedza mvura pasi pehuwandu hwayo hwekuwedzera hwakakwira kupfuura hwemethyl cellulose.
4. Hydroxypropyl methylcellulose inogara yakasimba kune acid nealkali, uye mvura yayo inogadzikana zvakanyanya muhuwandu hwe pH = 2 ~ 12. Caustic soda nemvura ye lime hazvina zvazvinobatsira pakushanda kwayo, asi alkali inogona kukurumidzisa kunyungudika kwayo uye kuwedzera zvishoma viscosity yayo. Hydroxypropyl methylcellulose inogara yakasimba kune common salts, asi kana huwandu hwemunyu hwakakwira, viscosity ye hydroxypropyl methylcellulose solution inowanzo kuwedzera.
5. Hydroxypropyl methylcellulose inogona kusanganiswa nemapolymers anonyungudika mumvura kuti igadzire mhinduro yakafanana uye yakakwira ye viscosity. Zvakadai se polyvinyl alcohol, starch ether, vegetable gum, nezvimwewo.
6. Hydroxypropyl methylcellulose ine simba rekudzivirira ma enzymes kupfuura methylcellulose, uye mukana wekuti enzyme solution yayo iparare zvishoma pane methylcellulose.
7. Kunamira kwehydroxypropyl methylcellulose mukugadzirwa kwemortar kwakakwirira kupfuura kwemethylcellulose.
Nguva yekutumira: Chivabvu-09-2023