PP khoom yas:
kev ua haujlwm:
Thermal thaj chaw: Ntawm tsib lub ntsiab lus dav hlau, qhov kub kub ntawm PP yog qhov zoo tshaj plaws. PP yas khoom ua haujlwm ntawm 100 ° C ntev, thiab thaum tsis muaj quab yuam sab nraud, cov khoom PP yuav tsis deformed thaum heated rau 150 ° C. Tom qab siv ib tug nucleating agent los txhim kho lub xeev crystalline PP , lub tshav kub tuaj yeem ua ntxiv tau zoo dua qub, thiab nws tuaj yeem siv tau los ua lub nkoj kom sov hauv lub qhov cub microwave.
Kev nyuab siab ua haujlwm tsis txaus siab: Kev nyuab siab tseem nyob hauv cov khoom molded, los yog cov khoom ua haujlwm nyob hauv kev nyuab siab tas mus li ntev, uas yuav ua rau kev tawg kev ntxhov siab. Organic solvents thiab surfactants yuav ua tau kom txhawb kev nyuab siab. Yog li, txoj kev ntsuam xyuas kev nyuab siab yog ua tiav thaum muaj ib tug surfactant. Ib tus kws pabcuam uas nquag siv yog ib qho alkyl aryl polyethylene glycol. Cov kev kuaj pom tau hais tias PP muaj qhov tsis zoo rau kev nyuab siab thaum tawg ntho hauv surfactant, thiab muaj cov tshuaj tiv thaiv zoo hauv cov huab cua, thiab me dua lub pob ntws khiav ntawm PP (qhov loj dua lub cev ua rau lub cev loj), qhov muaj zog ntawm txoj kev nyuab siab.
Ceev: PP yog qhov tsawg tshaj plaws ntawm txhua cov khoom cua sib txawv, tsuas yog 0.90 ~ 0.91g / cm3, uas yog li 60% ntawm PVC ntom. Qhov no txhais tau hais tias ntau dua cov khoom ntawm tib lub ntim tau tsim nrog tib qhov hnyav ntawm cov ntaub ntawv raw.
Mechanical properties: PP muaj zog tensile zog thiab rigidity, tab sis feem ntau lub zog yog pluag, tshwj xeeb tshaj yog nyob rau hauv qis kub. Tsis tas li, yog tias muaj kev cob qhia lossis kev nyuab siab thaum lub sij hawm sau hauv tsab xov xwm, qhov ua tau zoo kuj yog txo qis. Txawm hais tias qhov muaj zog tsis zoo, nws cov khoom siv dag zog yuav sib tw nrog ntau dua nqi hluav taws xob tshuab hauv ntau qhov chaw tom qab hloov kho los yog kev txhawb zog.
Kev laus kev ua ub no: Muaj cov qib cej luam theem hauv tertiary nyob hauv PP molecule, uas yog yooj yim tawg thiab degraded nyob rau hauv qhov kev txiav txim ntawm lub teeb thiab cua sov. PP tsis muaj stabilizer rhaub tom 150 ° C rau ntau tshaj ib teev, los yog nws yog obviously nkig thaum raug rau tshav ntuj rau 12 hnub. PP hmoov uas tsis muaj stabilizer yuav raug teeb meem degraded tom qab khaws cia hauv chav rau 4 lub hlis, thiab nws yuav tawm cov pom acidity. Ntxiv 0.2% lossis ntau dua ntawm cov tshuaj antioxidant ua ntej PP hmoov yaj phiv tuaj yeem ua rau kom tsis txhob degradation thiab laus ntawm PP thaum ua thiab siv. Antioxidants tau muab faib ua ob pawg: dawb radical chain reaction terminator (tseem hu ua cov tshuaj antioxidant thawj) thiab cov tshuaj yeeb dej cawv (tseem hu ua pabcuam antioxidant). Qhov tsim nyog ua ke ntawm thawj thiab qib siab antioxidants yuav Will ua si zoo zoo. Pom zoo B215 antioxidant yog ib qho ua ke ntawm cov tshuaj antioxidant 1010 (phenolic) thiab theem siab antioxidant 168 (phosphite) nyob rau hauv ib qho ratio ntawm 1: 2. Thiaj li tiv thaiv kev yees duab, nws yog ib qho tsim nyog ntxiv ib qho ultraviolet absorber rau PP, uas converts ultraviolet nqeg ntawm lub wavelength ntawm 290 mus rau 400 nm mus rau lub teeb ntsa hluav taws xob ntev dua. Rau PP yas khoom faus rau hauv cov av los yog siv sab hauv tsev tsaus ntuj, tsuas yog cov antioxidants tseem ceeb thiab ntu yuav ntxiv tau, thiab tsis muaj ultraviolet absorber ntxiv.
