HPMC inoshandiswa muWall Putty/Skim Coat

HPMC, kana kuti Hydroxypropyl Methyl Cellulose, inoshanda mabasa akasiyana-siyana zvichienderana nerudzi rwayo. MuChina, inonyanya kushandiswa mukuvaka. Kunyanya, mukugadzira wall putty kana skim coat, huwandu hwakawanda hwe skim coat powder, kusanganisira HPMC nezvimwe zvinhu zvakaita seupfu, hunosanganiswa zvakanaka uye hwobva hwanyungudutswa nekuwedzera mvura. Nzira iyi inodzivirira kusangana nekuda kwekunyungudutswa kwezvikamu zveHPMC mumvura.

Kupisa kwejeli kweHPMC kunoenderana nehuwandu hwayo hwemethoxy; huwandu hwakaderera hwemethoxy hunoita kuti gel iwedzere kupisa. HPMC inonyungudika pakarepo mumvura inotonhora, inorapwa neglyoxal, inokurumidza kupararira mumvura inotonhora, ichiratidza kuwedzera kwekunyungudika asi kwete kunyungudika zvachose. Kune rumwe rutivi, HPMC inonyungudika panguva imwe chete, isina kurapwa neglyoxal, inopararira nekukurumidza asi ine kunyungudika kunononoka nehuwandu hushoma. HPMC inogona kuiswa muzvikamu zviviri: mhando dzinonyungudika pakarepo nedzinonyungudika panguva imwe chete. Zvigadzirwa zvinonyungudika pakarepo zvinopararira nekukurumidza mumvura inotonhora uye zvishoma nezvishoma zvinowedzera kunyungudika, zvichigadzira colloid yakajeka inonyungudika. Mhando dzinonyungudika pakupisa, dzakakodzera skim coat nemortar, dzinoratidza agglomeration mu liquid glue uye coating.

Kugadzirwa kweHPMC kunosanganisira nzira yekunyungudutsa uchishandisa toluene kana isopropyl alcohol. Kushandiswa kweupfu hweskim coat kunoda viscosity yakaderera, inosvika 10,000, uchinyanya kutarisa pakudzivirira mvura. Kushandiswa kwemortar kunoda viscosity yakawanda, inosvika 15,000, ukuwo glue ichida zvigadzirwa zvinokurumidza zvine viscosity yakawanda. Huwandu chaihwo hweHPMC hunoshandiswa hunosiyana zvichienderana nemamiriro ekunze, tembiricha yenharaunda, grey calcium yemuno, skim coat formula, uye zvinodiwa nevatengi.

HPMC, ine hupfu hwe skim coat hunosvika 100,000, inoita basa guru mukuchengetedza mvura nekukora. Zvisinei, mukushandiswa kwayo, hupfu hwe 70,000 kusvika 80,000 hunogamuchirwa. Basa guru reHPMC mu skim coat rinosanganisira kukora, kuchengetedza mvura, uye kubatsira pakuvaka. Haibatanidzi mukuita kwemakemikari asi inobatsira pakudzivirira kuumbwa kwemabubbles nekuona kuti aomeswa zvakanaka.

Hukama huripo pakati pehupfu hweputty/skim coat nehunhu hwecalcium yemuash hwakakosha, nepo simba reHPMC riri shoma. Basa reHPMC mukuchengetedza mvura rinogona kukanganisa kurereka kwehupfu, uye kusangana kwayo nemvura panguva yekushandiswa kweskim coat kunosanganisira makemikari, zvichigadzira chinhu chitsva (calcium carbonate). Zvisinei, HPMC pachayo haibatanidzwi mukuita uku.

Mafomula akasiyana-siyana eupfu hweputty yemadziro anoenderana nezvinodiwa zvakasiyana, zvakaita seputty yemukati yemadziro yakajairika, putty yemukati yemadziro yakaomeswa zvakanyanya, putty yemukati yemadziro inodzivirira mvura, putty yekunze yemadziro yakaomeswa zvakanyanya, putty yemukati yemadziro inodzivirira kupwanyika uye kuonda, uye putty yekunze yemadziro inodzivirira kupwanyika, pakati pezvimwe. Fomura yega yega inotsanangura huwandu hweRedispersible Polymer Powder (RDP), upfu hwedouble fly, upfu hwegrey calcium, simende chena, uye HPMC, yakagadzirirwa kushandiswa kwakanangana nemortar, glue, kana coating.