Hydroxypropyl methylcellulose (HPMC)i polymer inonyungudika nemvura inowanzoshandiswa mukuvaka zvinhu. Inoshandiswa zvakanyanya musimende dhaka, putty poda, tile yekunamatira uye zvimwe zvigadzirwa. HPMC inonyanya kuvandudza kunaka kwesimende-yakavakirwa zvinhu nekuwedzera viscosity yehurongwa, kuvandudza simba rekuchengetedza mvura uye kugadzirisa mashandiro ekuvaka.
1. Mhedzisiro yeHPMC pakuchengetedza mvura kwesamende dhaka
Kuchengetedzwa kwemvura kwecement mortar zvinoreva kugona kwedhaka kuchengetedza mvura isati yanyatsooma. Kuchengetwa kwemvura kwakanaka kunobatsira hydration yakazara ye simenti uye inodzivirira kuputika uye kurasikirwa kwesimba kunokonzerwa nekurasikirwa kwemvura yakawandisa. HPMC inovandudza kuchengetwa kwemvura kwesamende dhaka nenzira dzinotevera:
Wedzera system viscosity
Mushure mokunge HPMC yanyunguduka mune simenti dhaka, inoumba yunifomu mesh chimiro, inowedzera viscosity yedhaka, yakaenzana kugovera mvura mukati medhaka uye inoderedza kurasikirwa kwemvura yemahara, nokudaro inovandudza kuchengetedza kwemvura. Ichi chimiro chinonyanya kukosha pakuvaka-kupisa kwepamusoro muzhizha kana kune zvigadziko zvepasi zvine mvura yakasimba.
Kugadzira chinodzivirira mwando
HPMC mamorekuru ane kunyura kwemvura kwakasimba, uye mhinduro yayo inogona kuumba hydration firimu yakatenderedza simende masimidhi, ayo anoita basa mukusunga mvura nekudzikisa mwero wekubuda kwemvura uye kunyura. Iyi firimu yemvura inogona kuchengetedza chiyero chemvura mukati medhaka, ichibvumira simenti hydration reaction kuti ienderere mberi zvakanaka.
Deredza kubuda ropa
HPMC inogona kunyatso kudzikisa kubuda kwedhaka, ndiko kuti, dambudziko remvura inonaya kubva mudhaka uye inoyangarara kumusoro mushure mekusanganiswa kwedhaka. Nekuwedzera viscosity uye tension yepasi yemushonga wemvura, HPMC inogona kutadzisa kutama kwekuvhenganisa mvura mudhaka, kuve nechokwadi chekugoverwa kwemvura kwakafanana panguva yesamende hydration process, uye nekudaro inowedzera kuwirirana uye kugadzikana kwedhaka.
2. Mhedzisiro yeHPMC pakuumbwa kwesamende dhaka
Basa reHPMC mudhaka resimende haringogumiri pakuchengetedza mvura, asi rinokanganisawo kuumbwa kwayo uye kuita kwayo, sezvinoratidzwa pazasi:
Kukanganisa iyo simenti hydration process
Kuwedzerwa kweHPMC kunozodzikisa hydration rate ye simenti hydration mukutanga nhanho, zvichiita kuti magadzirirwo ezvigadzirwa zve hydration ive yunifomu, izvo zvinoita kuti densification yechimiro chevhu. Uku kunonoka kuita kunogona kuderedza kutanga shrinkage kuparuka uye kunatsiridza kutsemuka kuramba kwedhaka.
Kugadzirisa rheological properties yedhaka
Mushure mekunyungudika, HPMC inogona kuwedzera purasitiki uye kushanda kwedhaka, ichiita kuti ive yakapfava panguva yekuisa kana kuisa, uye kushomeka kwekubuda ropa uye kupatsanurwa. Panguva imwecheteyo, HPMC inogona kupa dhaka imwe thixotropy, kuitira kuti ichengetedze yakakwira viscosity kana yakamira, uye fluidity inowedzerwa pasi pekuita kweshear force, iyo inobatsira pakuvaka mashandiro.
Kukurudzira kukura kwesimba rematope
Nepo HPMC ichivandudza kuita kwekuvaka kwedhaka, inogona zvakare kuve nekukanganisa kwayo kwekupedzisira simba. Sezvo HPMC ichigadzira firimu mune simende dhaka, inogona kunonoka kuumbwa kwezvigadzirwa zve hydration munguva pfupi, zvichiita kuti simba rekutanga ridzike. Nekudaro, sezvo simende hydration ichienderera mberi, hunyoro hunochengetwa neHPMC hunogona kusimudzira iyo gare gare hydration reaction, kuitira kuti simba rekupedzisira rigone kuvandudzwa.
Sekuwedzera kwakakosha kwesamende dhaka,HPMCinogona kunyatso kuvandudza kuchengetwa kwemvura yedhaka, kuderedza kurasikirwa kwemvura, kunatsiridza mashandiro ekuvaka, uye kukanganisa simende hydration process kune imwe nhanho. Nekugadzirisa chiyero cheHPMC, iyo yakanakisa chiyero pakati pekuchengetedza mvura, kushanda nesimba uye kusimba kunogona kuwanikwa kuzadzisa zvinodiwa zveakasiyana mashandisirwo mamiriro. Muzvirongwa zvekuvaka, kushandiswa zvine musoro kweHPMC kwakakosha zvikuru mukuvandudza dhaka remhando uye nekuwedzera kusimba.
Nguva yekutumira: Mar-25-2025