HPMC siv rau hauv Phab Ntsa Putty / Skim Coat

HPMC, lossis Hydroxypropyl Methyl Cellulose, ua haujlwm ntau yam raws li nws qib. Hauv Suav teb, nws feem ntau siv rau hauv kev tsim kho. Tshwj xeeb, hauv kev tsim cov phab ntsa putty lossis skim txheej, ntau cov hmoov skim txheej, suav nrog HPMC thiab lwm yam khoom siv hmoov, raug sib xyaw kom huv si thiab tom qab ntawd yaj los ntawm kev ntxiv dej. Txoj kev no tiv thaiv kev sib sau ua ke vim yog kev yaj tam sim ntawd ntawm HPMC cov khoom hauv dej.

Qhov kub ntawm HPMC gel nyob ntawm nws cov ntsiab lus methoxy; cov ntsiab lus methoxy qis dua ua rau qhov kub ntawm gel siab dua. HPMC uas yaj tau sai sai hauv dej txias, kho nrog glyoxal, sai sai tawg hauv dej txias, qhia txog kev nce viscosity tab sis tsis yaj tag nrho. Ntawm qhov tod tes, thermosoluble HPMC, tsis kho nrog glyoxal, tawg sai sai tab sis muaj viscosity qeeb dua nrog cov khoom me me. HPMC tuaj yeem muab faib ua hom instant thiab hom soluble thaum tshav kub. Cov khoom tam sim ntawd tawg sai sai hauv dej txias thiab maj mam nce viscosity, tsim cov colloid viscous pob tshab. Hom soluble thaum tshav kub, tsim nyog rau skim txheej thiab mortar, qhia txog kev sib sau ua ke hauv kua nplaum thiab txheej.

Kev tsim cov HPMC siv cov txheej txheem yaj uas siv toluene lossis isopropyl cawv. Kev siv cov hmoov txheej skim xav tau qhov viscosity qis dua, kwv yees li 10,000, nrog rau kev tsom mus rau kev tiv thaiv dej. Cov ntawv thov mortar xav tau qhov viscosity siab dua, kwv yees li 15,000, thaum cov ntawv thov kua nplaum xav tau cov khoom lag luam tam sim ntawd nrog viscosity siab. Qhov ntau npaum li cas ntawm HPMC siv sib txawv raws li huab cua, qhov kub thiab txias ib puag ncig, qhov zoo ntawm cov calcium grey hauv zos, cov mis txheej skim, thiab cov kev xav tau zoo ntawm cov neeg siv khoom.

HPMC, nrog rau qhov viscosity ntawm 100,000 hauv cov hmoov skim coat, ua lub luag haujlwm tseem ceeb hauv kev khaws dej thiab ua kom tuab. Txawm li cas los xij, hauv kev siv tiag tiag, qhov viscosity ntawm 70,000 txog 80,000 yog qhov txais tau. Lub luag haujlwm tseem ceeb ntawm HPMC hauv skim coat suav nrog kev ua kom tuab, khaws dej, thiab pab tsim kho. Nws tsis koom nrog cov tshuaj lom neeg tab sis pab tiv thaiv kev tsim cov npuas los ntawm kev ua kom qhuav kom zoo.

Qhov kev sib raug zoo ntawm cov hmoov putty / skim txheej phab ntsa thiab qhov zoo ntawm cov calcium tshauv tseem ceeb yog qhov tseem ceeb, thaum lub zog ntawm HPMC yog tsawg. Lub luag haujlwm ntawm HPMC hauv kev khaws dej tuaj yeem cuam tshuam rau cov hmoov poob, thiab nws qhov kev sib cuam tshuam nrog dej thaum lub sijhawm thov skim txheej cuam tshuam nrog kev tshuaj lom neeg, tsim cov tshuaj tshiab (calcium carbonate). Txawm li cas los xij, HPMC nws tus kheej tsis koom nrog cov tshuaj tiv thaiv no.

Muaj ntau hom hmoov putty rau phab ntsa uas haum rau ntau yam kev xav tau sib txawv, xws li cov putty sab hauv phab ntsa, cov putty sab hauv phab ntsa uas tawv heev, cov putty sab hauv phab ntsa uas tsis ntub dej, cov putty sab nraud uas tawv heev, cov putty sab hauv phab ntsa uas ntxuav tau thiab tsis ua pwm, thiab cov putty sab nraud uas tsis tawg thiab mos mos uas ntxuav tau, thiab lwm yam. Txhua hom mis qhia txog feem pua ​​ntawm Redispersible Polymer Hmoov (RDP), hmoov ob npaug yoov, hmoov calcium grey, cement dawb, thiab HPMC, uas tsim los rau cov kev siv tshwj xeeb xws li mortar, kua nplaum, lossis txheej.