EPS granular thermal insulation ngwa agha bụ ihe mkpuchi okpomọkụ agwakọta ya na ihe nrụnye inorganic, ihe nkedo organic, ihe mgbakwunye, ihe mgbakwunye na mkpokọta ọkụ n'otu akụkụ. N'etiti EPS granular thermal insulation ngwa agha nke a na-enyocha ugbu a ma tinye ya n'ọrụ, enwere ike ịmegharị ya na ntụ ntụ ntụ ntụ ntụ ntụ nwere mmetụta dị ukwuu na arụmọrụ nke ngwa agha ma na-enwe oke dị elu na ọnụ ahịa ya, n'ihi ya, ọ bụ uche ndị mmadụ. Arụmọrụ njikọ nke EPS urughuru mkpuchi ngwa agha mpụga mgbidi mkpuchi na-esite na polymer binder, na ihe mejupụtara ya bụ vinyl acetate/ethylene copolymer. Enwere ike nweta ntụ ntụ latex na-agbanwe agbanwe site na ịgbasa ụdị emulsion polymer a. N'ihi nkwadebe ziri ezi, njem dị mma na nchekwa dị mfe nke uzuzu latex na-arụ ọrụ, ntụ ntụ pụrụ iche na-emepe emepe aghọwo ihe na-emepe emepe n'ihi nkwadebe ya ziri ezi, njem dị mma na nchekwa dị mfe. Nrụmọrụ nke ngwa mkpuchi ihe mkpuchi nke EPS na-adabere n'ụzọ dị ukwuu n'ụdị na ọnụọgụ polymer ejiri. Ethylene-vinyl acetate latexr ntụ ntụ (EVA) nwere ọdịnaya ethylene dị elu na Tg dị ala (ntụgharị iko iko) uru nwere arụmọrụ ka mma n'ihe gbasara ike mmetụta, ike nkekọ na nkwụsị mmiri.
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 layering nke ngwa agha. N'oge a, mgbe a na-agbakwunye ciment ma gwakọta ya, ìgwè ndị polar na-adaba n'elu ihe ndị ahụ EPS na-ejikọta na simenti ahụ ma jikọta ya nke ọma, nke mere na arụ ọrụ nke mkpuchi mkpuchi EPS na-akawanye mma. A na-egosipụta nke a n'eziokwu na ihe EPS na-adị mfe site na tapawa ciment, na ike njikọ dị n'etiti abụọ ahụ na-akawanye mma.
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. Iji mụọ ọrụ ogologo oge nke redispersible latex ntụ ntụ na ngwa agha, SEM hụrụ na mgbe afọ 10 gasịrị, microstructure nke polymer na ngwa agha agbanwebeghị, na-ejigide njikọ kwụsiri ike, ike na-agbanwe agbanwe na mkpakọ na ezigbo mmiri na-egbochi mmiri. A na-amụ usoro nhazi nke ike nrapado taịl na redispersible latex ntụ ntụ, na achọpụtara na mgbe polymer akpọnwụwo n'ime ihe nkiri, ihe nkiri polymer guzobere mgbanwe njikọ n'etiti ngwa agha na tile n'otu aka, na na. N'aka nke ọzọ, polymer na ngwa agha na-abawanye ọdịnaya nke ikuku nke ngwa agha ma na-emetụta nhazi na wettability nke elu, ma n'oge usoro nhazi, polymer nwekwara mmetụta dị mma na usoro hydration na shrinkage nke ciment na. 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.
Oge nzipu: Mar-09-2023