Uzuzu latex na-agbanwe agbanwe bụ ihe gelling organic a na-ejikarị. Ọ bụ ntụ ntụ nke enwetara site na ịgbasa-ihicha polymer emulsion na mmanya polyvinyl dị ka colloid nchebe. Nke a ntụ ntụ nwere ike ọbụna gbasasịa na mmiri mgbe ezute mmiri. , na-akpụ emulsion. Ịtinye uzuzu latex na-agbanwe agbanwe nwere ike melite arụmọrụ mmiri simenti agwakọtara ọhụrụ, yana ịrụ ọrụ njikọ, mgbanwe, enweghị ike na mgbochi corrosion nke ngwa ngwa ciment siri ike.
Mmetụta nke latexr ntụ ntụ na ike njikọ nke ihe ndị sitere na ciment
Emulsion na redispersible latex ntụ ntụ nwere ike na-etolite elu tensile ike na bonding ike dị iche iche ihe mgbe film e guzobere, ha na-eji dị ka nke abụọ ihe nkedo na ngwa agha ikpokọta na inorganic binder ciment, ciment na polymer karị Nye egwuregwu zuru ezu na kwekọrọ ekwekọ ike imeziwanye arụmọrụ nke ngwa agha. Site n'ikiri microstructure nke ihe mejupụtara polymer-ciment, a kwenyere na mgbakwunye nke ntụ ntụ latex redispersible nwere ike ime ka polymer ghọọ ihe nkiri wee ghọọ akụkụ nke mgbidi oghere, ma mee ka ngwa agha ahụ ghọọ ihe dum site na ike dị n'ime. nke na-eme ka ike dị n'ime nke ngwa agha dịkwuo mma. Ike polymer, si otú ahụ na-eme ka nrụgide ọdịda nke ngwa agha dịkwuo elu ma na-abawanye nsogbu kachasị. A na-amụ ọrụ ogologo oge nke uzuzu latex na-atụgharị na ngwa agha. Ọ bụ SEM hụrụ na mgbe afọ 10 gasịrị, microstructure nke polymer na ngwa agha agbanwebeghị, a na-echekwa njikọ siri ike, mgbanwe mgbanwe na mkpakọ. ike na ezigbo mmiri mmiri. The redispersible latex ntụ ntụ amụwo usoro nhazi nke ike nrapado taịlị, wee chọpụta na mgbe polymer akpọnwụsịrị ma guzobe ihe nkiri, ihe nkiri polymer na-emepụta njikọ na-agbanwe agbanwe n'etiti ngwa agha na tile n'otu aka, na na N'aka nke ọzọ, ngwa agha ọhụrụ Na-emepụta ihe na-eme ka ọ dịkwuo elu ikuku nke ngwa agha ma na-emetụta nhazi na wettability nke elu, na mgbe e mesịrị n'oge usoro nhazi, polymer nwekwara mmetụta dị mma na usoro hydration na shrinkage nke ciment. ihe nkedo, ihe ndị a niile ga-enyere aka melite ike nkekọ.
Ịgbakwunye uzuzu latex redispersible na ngwa agha nwere ike imeziwanye ike njikọ na ihe ndị ọzọ, n'ihi na uzuzu hydrophilic latex na mmiri mmiri nke nkwusioru ciment na-abanye n'ime pores na capillaries nke matrix, na latex ntụ ntụ na-abanye n'ime pores na capillaries. . A na-emepụta ihe nkiri dị n'ime ma na-agbanyesi ike n'elu ihe nkedo ahụ, si otú a na-eme ka njikọ dị mma n'etiti ihe cimentious na mkpụrụ.
Nkwalite nke ntụ ntụ latex na arụmọrụ nke ngwa agha bụ n'ihi eziokwu ahụ bụ na latex ntụ ntụ bụ polymer molecular dị elu na ìgwè ndị polar. Mgbe a na-agwakọta ntụ ntụ latex na ihe ndị EPS, akụkụ nke na-abụghị polar na isi iyi nke polymer latex powder ga-eme ka mgbasa ozi anụ ahụ pụta na elu EPS na-abụghị polar. Otu polar dị na polymer na-atụgharị anya n'elu akụkụ nke EPS, nke mere na ihe EPS na-agbanwe site na hydrophobicity gaa na hydrophilicity. N'ihi ngbanwe nke elu nke EPS site na ntụ ntụ latex, ọ na-edozi nsogbu ahụ na ihe EPS na-adị mfe na mmiri. Na-ese n'elu mmiri, nsogbu nke nnukwu akwa akwa akwa. N'oge a, mgbe a na-agbakwunye ciment ma gwakọta ya, ìgwè ndị polar na-adaba n'elu ihe ndị ahụ EPS na-emekọrịta ihe na cementi ma jikọta ya nke ọma, nke mere na arụ ọrụ nke EPS mkpuchi mkpuchi na-akawanye mma. A na-egosipụta nke a n'eziokwu ahụ bụ na a na-eji ciment tapawa na-agbapụta ụmụ irighiri EPS ngwa ngwa, na ike njikọ dị n'etiti abụọ ahụ na-akawanye mma.
Oge nzipu: Mar-14-2023