Nrog rau kev nthuav dav txuas ntxiv ntawm cov khoom lag luam silicone, lawv nyob hauv txhua qhov chaw hauv lub neej. Tom qab ntawd cov lus nug tshwm sim: ua cov khoom silicone muaj qhov txaus ntshai "BPA"?
Ua ntej, peb nkag siab txog dab tsi "BPA" yog? BPA, tseem hu ua Bisphenol A, yog siv hauv kev lag luam kom synthesize cov ntaub ntawv xws li Polycarbonate (PC) thiab Epoxy Resin. Txij li thaum 1960s, nws tau siv los tsim cov roj yas (cov mis nyuj, khob pob ntseg, thiab dej qab zib (hmoov mis) cov kaus poom. Txawm li cas los xij, BPA tseem tuaj yeem ua rau cov kab mob endocrine, hem kev mob siab rau kev noj qab haus huv ntawm cov menyuam hauv plab thiab menyuam yaus. Kev pham tshwm sim los ntawm kev mob qog noj ntshav thiab cov teeb meem metabolic kuj tseem ntseeg txog qhov no. Cov European Union ntseeg tias tus menyuam cev tus menyuam muaj bisphenol uas tuaj yeem ua rau muaj kev tshaj tawm tiav pub dawb. Txog Lub Peb Hlis 2, 2011, kev tsim cov menyuam roj fwj muaj cov tshuaj bisphenol a (BPA) tau raug txwv.
Tom ntej no, cia saib cov txheej txheem yooj yim ntawm "Silicone" olicic silicone khoom, uas yog sib txuas nrog ntau pawg organic los ntawm silicon atoms. Yog li ntawd, nyob rau hauv cov qauv ntawm cov khoom lag luam silicone, muaj ob qho tib si hauv organic pawg "thiab" inorganic qauv ".
Qhov tshwj xeeb no thiab cov qauv molecular kom ua kom nws los ua ke cov yam ntxwv ntawm cov tshuaj organic nrog cov haujlwm ntawm cov khoom sib xyaw. Inorganic silica gel yog ib qho amorphous nrog tshuaj mis mis msio2o. Nws yog insoluble nyob rau hauv dej thiab ib qho hnyav, tsis- kev lom thiab ntxhiab tsw qab, thiab siv chemically. Nws tsis hnov qab hau nrog ib yam dab neeg tshwj tsis yog muaj alkali thiab hydrofluoric acid. Cov roj hmab silicone roj hmab, vim nws cov khoom hauv kev sib xyaw nrog cov khoom muaj organic, muaj cov vepcosity me me, muaj roj ntau, thiab roj av ntau permeability. Nws tseem muaj cov khoom zoo tshaj suav nrog kev tiv thaiv siab, nplaim taws ua rau, tsis muaj hluav taws xob, tsis muaj kev phom sij, tsis muaj kuab lom, thiab kev ua haujlwm ntawm lub cev. Silicone tsis yog -}}}- paab cov ntaub so ntswg, thiab muaj kev fab tshuaj tsis muaj kev ua txhaum, thiab muaj kev fab tshuaj tsis muaj kev ua txhaum, Nws muaj lub cev zoo thiab tshuaj lom neeg.
Thaum ntsib kev sib cuag ntawm lub cev thiab cov ntaub so ntswg, nws tuaj yeem tswj hwm nws tus thawj elasticity thiab kev muag muag yam tsis muaj degraded. Nws yog ib qho khoom siv khov kho hauv plab. Nws tuaj yeem tiv taus ntau kub thiab raug tshuaj tua kab mob. Nws yog yooj yim rau cov txheej txheem thiab daim ntawv, yooj yim rau cov txheej txheem thiab kos duab duab, thiab siv tau yooj yim. Los ntawm qhov no, nws tuaj yeem pom tias silica gel tsis muaj "bisphenol a".