Kev piav qhia ntawm PPR raj tsis zoo
PPR raj raw khoom yog random copolymer polypropylene, uas yog qhov peb hu ua hom ⅲ polypropylene. Nws yog tau los ntawm random copolymerization ntawm propylene monomer thiab ib tug me me ntawm ethylene monomer nyob rau hauv cua sov, siab thiab catalyst. Ethylene monomers yog randomly faib nyob rau hauv ntev propylene saw, thiab ethylene monomers feem ntau tswj ntawm 3 thiab 5. Cov ntsiab lus ntawm ethylene thiab polymerization txoj kev ntawm ethylene thiab propylene txiav txim siab nws txias brittleness.
Nyob rau hauv cov ntaub ntawv ntawm qhov kub thiab txias, tshwj xeeb tshaj yog nyob rau hauv lub caij ntuj no kev tsim kho txheej txheem, qhov yooj ntawm cov yeeb nkab ntawm qhov kub thiab txias yog txo, lub rigidity yog enhanced, thiab cov kev ua tau zoo yog nkig. Nyob rau hauv kev cuam tshuam ntawm kev quab yuam sab nraud lossis kev sib tsoo ntau dhau, cov kab tawg ntawm cov yeeb nkab yuav tshwm sim. Nqa qhov tsis yooj yim rau kev tsim kho. Yog li ntawd, cov kev cai ntawm lub teb chaws tau ua kom pom tseeb cov cai rau qhov teeb meem no.
Hauv kev tsim kho lub caij ntuj no, kev saib xyuas yuav tsum tau them rau cov yam ntxwv ntawm qhov kub thiab txias ntawm PPR pipeline rau lub tsev dej, thiab cov kev npaj tsim kho yuav tsum tau tsim. GB/T50349-2005 muaj cov ncauj lus kom ntxaws txog qhov no. Thaum lub ambient kub yog tsawg, lub toughness ntawm PPR yeeb nkab yog txo, qhia brittleness. Thaum cov yeeb nkab raug cuam tshuam los ntawm kev quab yuam sab nraud los yog lub zog hnyav, cov kab nrib pleb yuav tshwm sim, thiab qhov xwm txheej tawg pib los ntawm cov yeeb nkab sab hauv thiab txuas mus rau cov yeeb nkab sab nraud. Thaum cov yeeb nkab tawg los ntawm kev quab yuam ntawm ib qho taw tes, qhov tawg yuav nce sai heev raws li cov axis ntawm cov yeeb nkab hauv ib qho instant. Cov yam ntxwv no hu ua ceev nrooj tawg. Tsis tas li ntawd, lub caij ntuj no cov yeeb nkab hauv kev thauj mus los, nyob rau hauv qhov chaw thiab cov txheej txheem kev teeb tsa vim kev raug mob sab nraud, yuav tshwm sim hauv kev siv cov nkig thiab ductile yeeb nkab tawg.
Ntawm qhov tsis sib xws, qee qhov fake PPR hlab nrog lwm cov ntaub ntawv raw tsis yooj yim tawg. PPR yeeb nkab uas tuaj yeem xa cov dej kub thiab dej txias tuaj yeem siv rau 50 xyoo tuaj yeem tawg, tshwj xeeb tshaj yog nyob rau hauv qhov kub thiab txias, uas yog qhov kub thiab txias ntawm PPR.
Yog tias cov kav dej PPR tsis tuaj yeem tawg, nws tuaj yeem txiav txim siab tias nws tsis yog cov khoom siv PPR. Qhov zoo ntawm PPR hlab yog feem ntau cuam tshuam nrog kev nkag siab siab. Cov yeeb nkab zoo ntawm cov khoom siv PPR muaj qhov kub thiab txias, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig qis dua 5 degree, yog li cov yeeb nkab zoo tuaj yeem tawg, thiab qhov tawg feem ntau tsis yog PPR yeeb nkab. Qhov no tsis yog tib yam li qee qhov kev tshaj tawm, cov neeg siv yuav tsum tau ceev faj thaum yuav.
