EPS granular thermal insulation ngwa agha bụ ihe mkpuchi okpomọkụ agwakọta ya na ihe nkedo inorganic, ihe nkedo organic, admixture, admixture na mkpokọta ọkụ n'otu akụkụ. N'ime nyocha ugbu a na ngwa nke ngwa mkpuchi ihe mkpuchi EPS, ntụ ntụ na-agbanwe agbanwe na-enwe mmetụta dị ukwuu na arụmọrụ nke ngwa agha ahụ ma na-enwe oke dị elu na ọnụ ahịa ya, ya mere ọ na-abụkarị ihe a na-elekwasị anya. Arụmọrụ nkekọ nke EPS urughuru thermal ikpuchi ngwa agha mpụga mgbidi mkpuchi sistemu na-esite na polymer binder, na akụkụ ya bụ vinyl acetate/etylene copolymer. Enwere ike ịgbanye ụdị emulsion polymer a ka ọ nweta ntụ ntụ latex na-agbanwe agbanwe. N'ihi nkwadebe ziri ezi nke uzuzu latex redispersible na-ewu, njem dị mma na nchekwa dị mma, ntụ ntụ na-adịghị mma maka polymers aghọwo ihe na-emepe emepe n'ihi nkwadebe ya nke ọma, njem dị mma na nchekwa dị mma. Nrụmọrụ nke ngwa mgbochi ihe mkpuchi nke EPS na-adabere n'ụzọ dị ukwuu n'ụdị na ọnụọgụ polymer ejiri. Ethylene-vinyl acetate latex ntụ ntụ (EVA) nwere ọdịnaya ethylene dị elu na Tg dị ala (ntụgharị iko iko) uru nwere ihe ndị ka mma n'ihe gbasara ike mmetụta, ike nkekọ na mmiri na-eguzogide.
Nkwalite arụmọrụ nke uzuzu latex redispersible na ngwa agha bụ n'ihi eziokwu ahụ bụ na polymer ntụ ntụ bụ polymer molecular dị elu na otu polar. Mgbe ejikọta RDP na ihe irighiri EPS, akụkụ nke na-abụghị polar na agbụ bụ isi nke ntụ ntụ polymer ga-ejikọta ya na elu EPS na-abụghị polar. Otu polar dị na polymer na-atụgharị anya n'elu akụkụ nke EPS, na-eme ka ihe EPS gbanwee site na hydrophobic gaa na hydrophilic. N'ihi mgbanwe nke elu nke EPS site na polymer ntụ ntụ, a na-edozi nsogbu nke ihe EPS dị mfe izute mmiri. Na-ese n'elu mmiri, nnukwu nsogbu nke ngwa agha delamination. N'oge a, mgbe ị na-agbakwunye simenti na-akpali akpali, ndị otu polar na-adaba n'elu akụkụ EPS na-ejikọta na simenti ahụ ma jikọta nke ọma, nke na-eme ka arụ ọrụ nke mkpuchi mkpuchi EPS dịkwuo mma. A na-egosipụta nke a n'eziokwu ahụ bụ na a na-eji ciment slurry na-ete ụmụ irighiri EPS ngwa ngwa, na ike njikọ dị n'etiti abụọ ahụ na-akawanye mma.
Mgbe emulsion na redispersible latex ntụ ntụ na-etolite n'ime ihe nkiri, ha nwere ike ịmepụta ike tensile dị elu na ike njikọ dị iche iche. A na-eji ha dị ka ihe nkedo nke abụọ na ngwa ngwa iji jikọta ya na ciment inorganic binder, ciment na polymer n'otu n'otu. Kpọọ ike kwekọrọ ma kwalite arụmọrụ nke ngwa agha ahụ. Site n'ikiri microstructure nke ihe mejupụtara polymer-ciment, a na-ewere ya na mgbakwunye nke ntụ ntụ latex redispersible nwere ike ime ka ihe nkiri polymer ghọọ akụkụ nke mgbidi oghere ahụ, ma mee ka ngwa agha ahụ ghọọ ihe dum site na ike dị n'ime, nke na-eme ka ime ahụ dịkwuo mma. ike nke ngwa agha. Ike polymer, si otú ahụ na-amụba nrụgide ọdịda nke ngwa agha na ịba ụba nke kachasị. Iji mụọ ọrụ ogologo oge nke redispersible latex ntụ ntụ na ngwa agha, hụrụ site na nyocha microscope elektrọn, mgbe afọ 10 gasịrị, microstructure nke polymer na ngwa agha agbanwebeghị, na-ejigide njikọ kwụsiri ike, ike mgbanwe na ike mkpakọ yana ezigbo Hydrophobic. . Inweta redispersible latex ntụ ntụ dị ka ihe nyocha, a na-amụ usoro nhazi nke ike njikọ tile, wee chọpụta na mgbe polymer akpọnwụsịrị n'ime ihe nkiri, ihe nkiri polymer guzobere njikọ na-agbanwe agbanwe n'etiti ngwa agha na tile n'otu aka. , na n'aka nke ọzọ, ndị polymers na ngwa agha na-amụba ikuku nke ngwa agha, na-emetụta flatness na wettability nke elu, na emesia n'oge nhazi usoro, ndị polymers nwekwara mma. mmetụta na usoro hydration na shrinkage nke ciment. Adhesives, ihe ndị a niile na-enyere aka ịbawanye ike nkekọ.
Ịgbakwunye redispersible latex ntụ ntụ na ngwa agha nwere ike imeziwanye ike njikọ na ihe ndị ọzọ, n'ihi na usoro mmiri mmiri nke hydrophilic polymer powder na cement nkwusioru na-abanye n'ime pores na capillaries nke matrix, mgbe latex ntụ ntụ na-abanye n'ime pores na N'ime oghere. capillary. A na-emepụta ihe nkiri dị n'ime ma kwadoro ya n'elu ihe nkedo ahụ, si otú a na-eme ka ike dị mma n'etiti ihe gelled na mkpụrụ.
Oge nzipu: Jun-16-2023