Kodi ufa wa latex umapangitsa bwanji kugwira ntchito kwa matope

Mtondo wosakanizika wowuma umapangidwa ndikusakaniza mwakuthupi ufa wa latex wotayikanso ndi zomatira zina za inorganic ndi ma aggregates osiyanasiyana, zodzaza ndi zina.Pamene matope a ufa wowuma awonjezeredwa m'madzi ndikugwedezeka, pansi pa mphamvu ya hydrophilic protective colloid ndi makina ometa ubweya wa ubweya, tinthu tating'onoting'ono ta latex tingathe kumwazikana m'madzi, zomwe zimakhala zokwanira kupanga ufa wa latex wosakanizidwa kukhala wofewa. kanema.

Mapangidwe a latex ufa ndi osiyana, omwe adzakhudza rheology ndi zomangamanga zosiyanasiyana za matope.Kugwirizana kwa ufa wa latex m'madzi akamabalalitsidwanso, ma viscosities osiyanasiyana a latex ufa pambuyo kubalalitsidwa, kukopa kwa mpweya wamatope ndi kugawa kwa thovu la mpweya, kuyanjana pakati pa ufa wa latex ndi zowonjezera zina, ndi zina zotero, zimapanga zosiyana. latex ufa wawonjezera madzimadzi., Wonjezerani thixotropy, kuwonjezera mamasukidwe akayendedwe ndi zina zotero.

Pambuyo pa matope osakanikirana omwe ali ndi latex powder dispersion apangidwa, ndi kuyamwa kwa madzi ndi pansi pamtunda, kugwiritsira ntchito hydration reaction, ndi kuphulika kwa mpweya, madzi adzachepa pang'onopang'ono, tinthu tating'onoting'ono timayandikira, mawonekedwewo adzatha. Pang'onopang'ono kusokoneza, ndipo pang'onopang'ono kuphatikizana wina ndi mzake, ndipo potsiriza kuphatikizira kupanga filimu.Njira yopanga filimu ya polima imagawidwa m'magawo atatu.

Mu gawo loyamba, polima particles kusuntha momasuka mu mawonekedwe a Brownian zoyenda mu koyamba emulsion.Madzi akamasanduka nthunzi, kusuntha kwa tinthu ting’onoting’ono kumakhala koletsedwa mwachibadwa, ndipo kukangana kwapakati pa madzi ndi mpweya kumawachititsa kuti agwirizane pang’onopang’ono.

Mu gawo lachiwiri, pamene tinthu tating'onoting'ono takumana ndi mzake, madzi maukonde amasanduka nthunzi kudzera capillary machubu, ndi mkulu capillary mavuto ntchito pamwamba pa particles kumapangitsa mapindikidwe a latex spheres kusakaniza iwo pamodzi, ndi madzi otsala amadzaza pores, ndipo filimuyo imapangidwa mozungulira.

Gawo lachitatu, lomaliza limathandizira kufalikira kwa mamolekyu a polima kukhala filimu yeniyeni yopitilira.Pakupanga filimu, tinthu tating'onoting'ono ta latex tating'onoting'ono timaphatikizana kukhala gawo latsopano la kanema wokhala ndi kupsinjika kwakukulu.Mwachiwonekere, kuti athe redispersible latex ufa kupanga filimu mu matope owuma, m'pofunika kuonetsetsa kuti osachepera filimu kupanga kutentha ndi otsika kuposa kuchiritsa kutentha kwa matope..

Nthawi zambiri amakhulupirira kuti redispersible latex ufa bwino workability wa matope atsopano: ufa wa latex, makamaka zoteteza colloid, ali ndi kuyanjana kwa madzi ndi kumawonjezera mamasukidwe akayendedwe a slurry ndi bwino kugwirizana kwa zomangamanga matope.Mumtondo, ndikuwongolera brittleness, zotanuka modulus ndi zofooka zina za matope a simenti, ndikupangitsa kuti matope a simenti akhale osinthika bwino komanso olimba omangika, kuti athe kukana ndikuchedwetsa kuphulika kwa matope a simenti.Popeza polima ndi matope kupanga interpenetrating maukonde dongosolo, mosalekeza polima filimu aumbike mu pores, amene kumalimbitsa mgwirizano pakati pa aggregates ndi midadada ena pores mu matope, kotero kusinthidwa matope pambuyo kuumitsa ndi bwino kuposa simenti matope.Pali kusintha kwakukulu.