Udaka oluxutshwe okomile lwenziwa ngokuhlanganisa ngokomzimba impushana ye-latex ehlakazeka kabusha nezinye izinto ezinamathelayo ezingaphili kanye namaqoqo ahlukahlukene, izigcwalisi nezinye izithasiselo.Lapho udaka olomile lwempuphu lufakwa emanzini futhi lunyakaziswa, ngaphansi kwesenzo se-hydrophilic protective colloid kanye ne-mechanical shear force, izinhlayiya ze-latex powder zingahlakazwa ngokushesha emanzini, okwanele ukwenza ngokugcwele i-latex powder ehlakazekayo ibe ifilimu.
Ukwakheka kwe-latex powder kuhlukile, okuzothinta i-rheology kanye nezakhiwo ezihlukahlukene zokwakha zodaka.Ukuhlobana kwempushana ye-latex emanzini lapho ihlakazwa kabusha, ama-viscosities ahlukene empushana ye-latex ngemva kokuhlakazwa, ithonya emoyeni wodaka kanye nokusatshalaliswa kwamabhamuza omoya, ukusebenzisana phakathi kwempushana ye-latex nezinye izithasiselo, njll., kwenza okuhlukile. izimpushana ze-latex ziye zanda uketshezi., Khulisa i-thixotropy, ukwandisa i-viscosity nokunye.
Ngemuva kokwakhiwa kodaka olusanda kuxutshwa oluqukethe i-latex powder dispersion, ngokumuncwa kwamanzi endaweni engaphansi, ukusetshenziswa kwe-hydration reaction, kanye nokushintshashintsha emoyeni, amanzi azokwehla kancane kancane, izinhlayiya zizosondela kancane kancane, ukuxhumana kancane kancane fiphaza, futhi kancane kancane uhlangane nomunye, futhi ekugcineni uhlanganise ukwakheka kwefilimu.Inqubo yokwakhiwa kwefilimu ye-polymer ihlukaniswe izigaba ezintathu.
Esigabeni sokuqala, izinhlayiya ze-polymer zihamba ngokukhululekile ngesimo sokunyakaza kwe-Brownian ku-emulsion yokuqala.Njengoba amanzi ehwamuka, ukunyakaza kwezinhlayiya ngokwemvelo kukhawulelwe ngokwengeziwe, futhi ukungezwani kobuso phakathi kwamanzi nomoya kuyawaphoqa ukuthi aqondane kancane kancane.
Esigabeni sesibili, lapho izinhlayiya zihlangana zodwa, amanzi akunethiwekhi ayahwamuka ngamashubhu e-capillary, futhi ukungezwani okuphezulu kwe-capillary okufakwe ebusweni bezinhlayiya kubangela ukuwohloka kwezinhlayiya ze-latex ukuze zihlangane, futhi amanzi asele agcwalisa ama-pores, futhi ifilimu yakhiwe cishe.
Isigaba sesithathu, sokugcina senza ukuthi ama-molecule e-polymer asakazwe abe yifilimu yeqiniso eqhubekayo.Ngesikhathi sokwenziwa kwefilimu, izinhlayiya ze-latex ezihamba zodwa zihlangana zibe yisigaba esisha sefilimu esinokucindezeleka okuphezulu.Ngokusobala, ukuze unike amandla impushana ye-latex ehlakazeka kabusha ukuze yakhe ifilimu odakeni oluqinile, kuyadingeka ukuqinisekisa ukuthi izinga lokushisa elincane lokwakhiwa kwefilimu liphansi kunezinga lokushisa lokuphulukisa likadaka..
Ngokuvamile kukholakala ukuthi i-latex powder ehlakazeka kabusha ithuthukisa ukusebenza kodaka olusha: i-latex powder, ikakhulukazi i-colloid evikelayo, inobudlelwane bamanzi futhi yandisa i-viscosity ye-slurry futhi ithuthukisa ukuhlangana kodaka lokwakha.Odakeni, okokuthuthukisa ukuqina, imodulus enwebekayo ephezulu kanye nobunye ubuthakathaka bodaka lukasimende lwendabuko, kanye nokunikeza udaka lukasimende ukuguquguquka okungcono namandla ebhondi eqinile, ukuze limelane futhi libambezele ukukhiqizwa kokuqhekeka kodaka lukasimende.Njengoba i-polymer kanye nodaka lwakha isakhiwo senethiwekhi esingena ngaphakathi, ifilimu ye-polymer eqhubekayo yenziwa ezimbotsheni, eqinisa ukubopha phakathi kwama-aggregates futhi ivimbele ezinye izimbotshana odakeni, ngakho udaka oluguquliwe ngemuva kokuqina lungcono kunodaka lukasimende.Kukhona ukuthuthuka okukhulu.
Isikhathi sokuthumela: Mar-20-2023