Kubatana kwelatex poda kumvura kana yaparadzirwa, iwo akasiyana maviscosities elatex poda mushure mekupararira, pesvedzero pamhepo yedhaka uye kugovaniswa kwemabhuru emhepo, kudyidzana pakati pehupfu yerabha nezvimwe zvinowedzera, zvichingodaro. latex poda yakawedzera fluidity. , Wedzerai thixotropy, kuwedzera viscosity uye zvichingodaro.
Vandudza kushanda
Zvinowanzotendwa kuti iyo redispersible latex powder inovandudza kushanda kwedhaka itsva: latex powder, kunyanya inodzivirira colloid, ine hukama hwemvura uye inowedzera viscosity ye slurry uye inovandudza kubatanidzwa kwevhu rekuvaka. Mushure meiyo ichangobva kusanganiswa dhaka ine latex poda dispersion yakaumbwa, nekutorwa kwemvura nepasi pevhu, kushandiswa kwe hydration reaction, uye kuvhuvhuta kumhepo, mvura inodzikira zvishoma nezvishoma, zvimedu zvichaswedera zvishoma nezvishoma, iyo interface ichaita. zvishoma nezvishoma vanosvibiswa, uye vanozobatana zvishoma nezvishoma uye pakupedzisira kuunganidza. kugadzira firimu. Maitiro ekuumbwa kwemafirimu epolymer akakamurwa kuita matanho matatu. Muchikamu chekutanga, zvikamu zvepolymer zvinofamba zvakasununguka muchimiro cheBrownian motion mune yekutanga emulsion. Sezvo mvura ichinyungudika, kufamba kwezvimedu kunowanzova kwakaganhurirwa, uye kusawirirana kwezviso pakati pemvura nemhepo kunomanikidza kuti zviwirirane zvishoma nezvishoma. Muchikamu chechipiri, kana zvimedu zvatanga kusangana, mvura iri mumambure inoputika kuburikidza necapillary, uye iyo yakakwira capillary tension yakaiswa pamusoro pezvimedu zvinoita kuti deformation ye latex spheres isanganise pamwe chete, uye mvura yakasara inozadza pores, uye iyo firimu inenge yakaumbwa. Yechitatu, nhanho yekupedzisira inobvumira kupararira (dzimwe nguva kunonzi kuzvidzora) kwemamorekuru epolymer kuumba firimu rechokwadi rinoenderera. Munguva yekugadzira firimu, yakasarudzika nharembozha latex masisitimu anobatana kuita chikamu chitsva chefirimu chine kushushikana kwakanyanya. Zviripachena, kuitira kugonesa redispersible latex poda kuti iite firimu mudhaka rakaomeswa, zvinodikanwa kuve nechokwadi chekuti tembiricha yekuumba firimu (MFT) yakaderera pane kupisa tembiricha yedhaka.
Wedzera kushushikana kwezvinhu
Nekuumbwa kwekupedzisira kweiyo polymer firimu, sisitimu inosanganisira inorganic uye organic binder zvimiro, kureva, brittle uye yakaoma skeleton inoumbwa nezvinhu zvehydraulic, uye firimu rinoumbwa neredispersible latex poda mumikaha uye yakasimba nzvimbo inoumbwa mu akaporesa dhaka. flexible network. Kusimba kwekusimba uye kubatana kwepolymer resin firimu inogadzirwa nelatex poda inowedzerwa. Nekuda kwekuchinjika kwepolymer, iyo deformation kugona kwakakwira zvakanyanya kupfuura iyo yedombo resimende rakaomarara chimiro, iyo deformation kuita kwedhaka inovandudzwa, uye mhedzisiro yekuparadzira kushushikana inovandudzwa zvakanyanya, nekudaro ichivandudza kutsemuka kwedhaka. . Nekuwedzera kwezviri mukati redispersible latex poda, iyo system yese inokura yakananga kupurasitiki. Kana iri yakakwira latex poda yemukati, chikamu chepolymer mudhaka yakarapirwa zvishoma nezvishoma chinodarika inorganic hydration chigadzirwa chikamu, uye dhaka richaita shanduko yemhando uye ive elastomer, nepo hydration chigadzirwa chesimende ichiva "yekuzadza". “. Kusimba kwesimba, elasticity, kuchinjika uye kuvharika kwedhaka rakagadziridzwa neredispersible latex poda zvese zvinovandudzwa. Kusanganiswa kwelatex poda inodhindwa zvakare kunobvumira iyo polymer firimu (latex film) kuumba uye kuita chikamu chemadziro epore, nekudaro ichivhara iyo yakakwirira porosity chimiro chedhaka. Latex membrane ine inozvitwasanudza yega iyo inoita tension painosungirirwa padhaka. Kuburikidza nemasimba aya emukati, dhaka rinochengetedzwa sese, nokudaro richiwedzera kusimba kwakabatana kwedhaka. Kuvapo kwemapolymer anochinjika uye ane elastic zvakanyanya anovandudza kuchinjika uye elasticity yedhaka. Iyo nzira yekuwedzera kwekunetseka kwegoho uye simba rekukundikana ndeiyi inotevera: kana simba rinoshandiswa, microcracks inononoka kusvikira kushushikana kwakanyanya kwasvika nekuda kwekuvandudza kushanduka uye elasticity. Pamusoro pezvo, iyo interwoven polymer domains zvakare inotadzisa kubatana kwema microcracks mukupinda mukati. Naizvozvo, iyo redispersible polymer poda inovandudza kutadza kushushikana uye kutadza dhizaini yechinhu.
Nguva yekutumira: Mar-09-2023