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 yerabha nezinye izithasiselo, njll., kwenza okuhlukile. izimpushana ze-latex ziye zanda uketshezi. , Khulisa i-thixotropy, ukwandisa i-viscosity nokunye.
Thuthukisa ukusebenza
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. 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 zizofiphala, futhi kancane kancane zizohlangana zodwa futhi ekugcineni zihlanganiswe. ukwakha ifilimu. 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 kwezinhlayiyana ngokwemvelo kukhawulelwe ngokwengeziwe, futhi ukungezwani kobuso phakathi kwamanzi nomoya kuyawaphoqa ukuthi aqondane kancane kancane. Esigabeni sesibili, lapho izinhlayiya ziqala ukuxhumana, amanzi akunethiwekhi ayahwamuka ngokusebenzisa i-capillary, futhi ukungezwani okuphezulu kwe-capillary okufakwe ebusweni bezinhlayiya kubangela ukuguquguquka kwezinhlayiya ze-latex ukuze zihlangane, futhi amanzi asele agcwalisa ama-pores, futhi ifilimu yakhiwe cishe. Isigaba sesithathu, sokugcina sivumela ukusakazeka (ngezinye izikhathi okubizwa ngokuthi i-self-adhesion) yama-molecule e-polymer ukwakha ifilimu yeqiniso eqhubekayo. Ngesikhathi sokwenziwa kwefilimu, izinhlayiya ze-latex ezihamba zodwa zihlangana zibe yisigaba esisha sefilimu esinokucindezeleka okukhulu. Ngokusobala, ukuze unike amandla impushana ye-latex ehlakazeka kabusha ukuze yakhe ifilimu odakeni oluqinile, kuyadingeka ukuqinisekisa ukuthi izinga lokushisa elincane lokubunjwa kwefilimu (MFT) liphansi kunezinga lokushisa lokuphulukisa lodaka.
Khulisa ingcindezi yezinto ezibonakalayo
Ngokwakhiwa kokugcina kwefilimu ye-polymer, uhlelo oluhlanganisa izakhiwo ze-inorganic kanye ne-organic binder, okungukuthi, uhlaka lwamathambo oluqinile noluqinile olwakhiwe ngezinto ezisebenza nge-hydraulic, kanye nefilimu eyakhiwe yimpushana ye-latex ehlakazeka kabusha ezikhaleni kanye nezindawo eziqinile. udaka olulashiwe. inethiwekhi eguquguqukayo. Amandla aqinile kanye nokuhlangana kwefilimu ye-polymer resin eyakhiwe yi-latex powder kuyathuthukiswa. Ngenxa yokuguquguquka kwe-polymer, amandla okuguqula aphakeme kakhulu kunesakhiwo esiqinile samatshe usimende, ukusebenza kwe-deformation yodaka kuyathuthukiswa, futhi umphumela wokuhlakazeka kwengcindezi uthuthukiswa kakhulu, ngaleyo ndlela kuthuthukiswe ukumelana nokuqhekeka kodaka. . Ngokukhula kokuqukethwe kwempushana ye-latex ehlakazeka kabusha, lonke uhlelo luthuthukela kupulasitiki. Endabeni yokuqukethwe okuphezulu kwe-latex powder, isigaba se-polymer odakeni oluphulukisiwe kancane kancane sidlula isigaba somkhiqizo we-inorganic hydration, futhi udaka luzoshintsha ikhwalithi futhi lube i-elastomer, kuyilapho umkhiqizo we-hydration kasimende uba "ukugcwalisa". “. Amandla aqinile, ukuqina, ukuguquguquka kanye nokuvaleka kodaka oluguquliwe yi-latex powder ehlakazeka kabusha konke kuyathuthukiswa. Ukuhlanganiswa kwempushana ye-latex ehlakazeka kabusha kuvumela ifilimu ye-polymer (ifilimu ye-latex) ukuthi yakhe futhi yakhe ingxenye yodonga lwezimbotshana, ngaleyo ndlela ivale ukwakheka okuphezulu kwe-porosity yodaka. Ulwelwesi lwe-latex lunomshini wokuzelula osebenza kanzima lapho luboshelwe odakeni. Ngala mandla angaphakathi, udaka lugcinwa lulonke, ngaleyo ndlela lukhulise amandla okuhlangana kodaka. Ukuba khona kwama-polymers aguquguquka kakhulu futhi anwebeka kakhulu kuthuthukisa ukuguquguquka nokunwebeka kodaka. Indlela yokwanda kokucindezeleka kwesivuno namandla okuhluleka ingokulandelayo: lapho kusetshenziswa amandla, ama-microcracks abambezeleka kuze kufinyelelwe ukucindezeleka okuphezulu ngenxa yokuguquguquka okuthuthukisiwe nokunwebeka. Ukwengeza, izizinda ze-polymer ezihlanganisiwe futhi zivimbela ukuhlangana kwama-microcracks emifantwini engena. Ngakho-ke, i-polymer powder ehlakazeka kabusha ithuthukisa ukucindezelwa kokuhluleka kanye nokwehluleka kokusebenza kwezinto.
Isikhathi sokuthumela: Mar-09-2023