Imbali yoPhuhliso lwePowder eDispersible

I-Redispersible powder (RDP) luhlobo lwepolymer powder olusetyenziswa kwishishini lokwakha njengesongezo kwiimveliso ezisekelwe kwi-samente ezifana nodaka, i-grouts, kunye ne-self-leveling compounds. Ii-RDPs zaqala ukuphuhliswa ngo-1950 kwaye ukususela ngoko ziye zaba licandelo elibalulekileyo kwizinto zokwakha zangoku. Kweli nqaku, siza kujonga ngakumbi kwimbali yophuhliso lwe-RDP kunye nokubaluleka kwayo kwishishini lokwakha.

Iminyaka yokuqala

Ii-RDPs zokuqala zaphuhliswa ngo-1950 yinkampani yaseJamani ebizwa ngokuba yiWacker Chemie AG. Ngelo xesha, i-Wacker Chemie AG yayivelisa izinto ezintsha zokwenziwa ukuhlangabezana neemfuno ezikhulayo ze-boom yokwakha emva kwemfazwe. Babejonge indlela yokuphucula izinto ezenziwe ngesamente, ezifana nokunganyangeki kwamanzi, ukuqina, kunye nokuguquguquka.

Ngeentsuku zokuqala, ii-RDPs zaveliswa ngokuchithwa kwe-polyvinyl acetate (PVA) kwi-solvent kwaye emva koko itshiza isisombululo kwigumbi elifudumeleyo apho i-solvent iya kunyuka, ishiye i-powder ecocekileyo. Lo mgubo unokusasazwa ngokulula emanzini kwaye usetyenziswe njengesongezo kwiimveliso ezenziwe ngesamente.

Nangona kunjalo, bekukho imida kolu hlobo lokuqala lweRDP. Ngokomzekelo, kwakunzima ukulawula ubungakanani beqhekeza kunye nokuma kwepowder, enokuchaphazela ukusebenza kwayo kwiimveliso ezisekelwe kwi-samente. Ukongeza, umgubo awuzange uzinze kakhulu kwaye wawudla ngokwenza amaqhuma okanye i-clumps, okwenza kube nzima ukuphatha nokusebenzisa.

Uphuculo kunye nezinto ezintsha

Ukutyhubela iminyaka, abaphandi kunye neenjineli benze uphuculo olubonakalayo kwinkqubo yokuvelisa kunye neepropathi zeRDPs. Ngokomzekelo, ukuqhubela phambili kwi-polymer chemistry kuye kwakhokelela ekuphuhlisweni kweepolymers ezintsha ezibonelela ngokuphucuka kokusebenza kunye nokuzinza.

Enye yezona nkqubela zibalulekileyo kubuchwepheshe be-RDP yeza ngo-1980 ngokuziswa kwenkqubo entsha yemveliso ebizwa ngokuba yi-spray drying. Le nkqubo ibandakanya ukutshiza i-emulsion ye-polymer kwigumbi elifudumeleyo apho amanzi aphuphuma khona, eshiya emva komgubo ococekileyo. Le ndlela ivumele ukulawula okukhulu kwi-particle size kunye nokumila kwe powder, okubangelwa ukusebenza okuhambelanayo kunye nokuqikelelwa kwangaphambili kwiimveliso ezisekelwe kwi-samente.

Enye into entsha kwi-teknoloji ye-RDP yafika kunye nokuqaliswa kwe-latex powder (RPL), eyenziwa kwi-latex emulsion endaweni ye-PVA. I-RPLs inikezela ukuchasana kwamanzi okuphuculweyo kunye nokubambelela xa kuthelekiswa ne-RDPs esekelwe kwi-PVA, okwenza kube yinto ethandwayo yokukhethwa kwezicelo zangaphandle ezifana ne-stucco kunye ne-EIFS (i-insulation yangaphandle kunye nenkqubo yokugqiba).

Izicelo kunye neenzuzo

Ii-RDPs zibonelela ngenani leenzuzo kushishino lokwakha, kubandakanywa ukuphucuka kokusebenza, ukuncamathela, kunye nokumelana namanzi. Zingasetyenziselwa uluhlu olubanzi lweemveliso ezisekelwe kwi-samente, kuquka i-mortars, i-grouts, i-self-leveling compounds, kunye ne-adhesives tile.

Enye yeenzuzo eziphambili zee-RDPs kukukwazi kwabo ukuphucula ukusebenza kunye nokulula ukusetyenziswa kweemveliso ezenziwe ngesamente. Banokunciphisa inani lamanzi afunekayo ukufezekisa ukuhambelana okufunwayo, okunokuphucula amandla kunye nokuqina kwemveliso egqityiweyo. Zinokunceda ukunciphisa ukuqhekeka kunye nokushwabana, okunokuthi kwenzeke xa iimveliso ezenziwe ngesamente zoma ngokukhawuleza.

Ukongeza, ii-RDPs zinokuphucula ukuncamathelwa kweemveliso ezisekwe kwisamente kwiintlobo ngeentlobo ze-substrates, kubandakanywa iinkuni, isinyithi, kunye ne-masonry. Banokuphucula ukuxhathisa kwamanzi kunye nokuqina kweemveliso ezisekelwe kwi-samente, zibenze zilungele ukusetyenziswa kwiindawo ezimanzi okanye kwiindawo eziphantsi kwezithuthi eziphezulu okanye impembelelo.

Ukuqukumbela

Ukuqukumbela, imbali yophuhliso lwe-RDP iphawulwe ngenkqubela phambili ebalulekileyo kwi-polymer chemistry kunye neenkqubo zokuvelisa. Ukususela ekuqaleni kwayo ngoo-1950s, i-RDP iye yaba licandelo elibalulekileyo kwizinto zokwakha zale mihla, inika uluhlu olubanzi lweenzuzo malunga nokusebenza, ukubambelela.