Qhov txawv ntawm PE raj thiab PPR raj

Thaum ntau tus neeg siv xaivPE tub, lawv feem ntau yooj yim ua yuam kev vim tsis nkag siab txog nws.Lawv tsis paub seb puas yuav siv random copolymerized polypropylene kav lossis cov kav dej polyethylene rau cov dej num hauv kev tsim kho.Qhov txawv ntawm lawv yog dab tsi?Woolen daim ntaub?Cia kuv qhia rau koj.

Cov ntsiab lus tseem ceeb yog raws li nram no:

Hauv dej haus, PE feem ntau yog siv los ua cov kav dej txias;PPR (cov khoom siv dej kub tshwj xeeb) tuaj yeem siv ua cov kav dej kub;tseem muaj PPR (cov khoom siv dej txias) siv los uacov kav dej txias; Yog tias nws yog cov kav dej kub, tau kawg PPR zoo dua;(yog tias nws yog cov kav dej haus rau kev kho kom zoo nkauj hauv tsev, tsis tas yuav tsum paub qhov txawv, qhov tseem ceeb PPR siv ntau dua PE) Yog tias koj ua cov kav dej txias, koj tuaj yeem xa mus rau qhov sib txawv hauv qab no:

1. Kev sib piv ntawm qhov kub thiab txias ntawm PPR cov kav dej thiabPE kav dej.

Raws li kev siv ib txwm, PE cov yeeb nkab dej muaj qhov kub thiab txias ntawm 70 ° C thiab qhov kub ntawm -30 ° C.Uas yog hais tias, nyob rau hauv xws li ib tug kub qhov ntau, kev siv mus sij hawm ntev ntawm PE kav dej muaj kev ruaj ntseg thiab txhim khu kev qha.

Raws li kev siv ib txwm, PPR cov kav dej muaj qhov kub thiab txias ntawm 70 ° C thiab qhov kub ntawm -10 ° C.Nws kuj tseem qhia tau tias nyob rau hauv qhov kub thiab txias no, kev siv cov kav dej PPR mus ntev kuj muaj kev nyab xeeb thiab txhim khu kev qha.Nws tau txiav txim siab tias PE cov kav dej muaj qhov kub thiab txias zoo li PPR cov kav dej.Txawm li cas los xij, PE cov kav dej zoo dua li cov kav dej PPR nyob rau hauv cov nqe lus ntawm qhov kub thiab txias.

2.qhov sib txawv ntawm PE cov kav dej thiab cov kav dej PPR raws li kev nyiam huv

Lub ntsiab chemical molecular tivthaiv ntawm PE dej yeeb nkab yog polyethylene.Cov neeg nyeem uas tau kawm txog cov organic chemistry paub tias qhov muaj pes tsawg leeg ntawm cov khoom no yog ob lub pa roj carbon atoms ua ke nrog tsib hydrogen atoms, ib qho yog ua ke nrog cov pa roj carbon atom los ntawm ob daim ntawv cog lus, thiab tom qab ntawd ethylene tib lub molecule ntawm cov polymer yog polymerized nyob rau hauv ib tug. qee txoj kev, thiab cov khoom zoo li no yog cov khoom siv polyethylene.Yog li dab tsi yog PPR cov kav dej?Lub ntsiab tivthaiv ntawm PPR dej yeeb nkab yog propylene, uas yog, peb carbon atoms yog ua ke nrog xya hydrogen atoms, thiab ib hydrogen atom yog ua ke nrog ib tug carbon atom nrog ob daim ntawv cog lus, thiab ces cov khoom tsim tom qab polymerization yog ib tug polypropylene khoom.Cov khoom zoo li no yuav luag zoo ib yam ntawm kev nyiam huv thiab kev nyab xeeb.Qhov tseem ceeb yog seb cov khoom siv raw siv los ntawm lub tuam txhab ua tau raws li qhov yuav tsum tau ua, tsis yog qhov sib txawv ntawm ob yam khoom.Nws tseem tsis tau muaj peev xwm tshaj tawm tias cov kav dej PE muaj kev nyiam huv ntau dua li cov kav dej PPR hauv cov ntawv xov xwm.Tag nrho cov kav dej PE thiab PPR cov kav dej uas tsim nyog yuav tsum tau kuaj xyuas kev huv (tshwj tsis yog cov khoom cuav thiab cov khoom tsis zoo).Nws tseem yog kev dag ntxias rau cov neeg siv khoom hais tias PE cov kav dej muaj kev nyiam huv thiab nyab xeeb dua li cov kav dej PPR.

3. Elastic modulus

Lub elastic modulus ntawm PPR dej yeeb nkab yog 850MPa.PE dej yeeb nkab belongs rau nruab nrab ntom polyethylene, thiab nws elastic modulus tsuas yog hais txog 550MPa.Nws muaj qhov yooj yooj yim thiab tsis txaus rigidity.Nws yog siv rau hauv kev tsim cov khoom siv dej.Tsis zoo nkauj.

Thermal conductivity: PPR dej yeeb nkab yog 0.24, PE dej yeeb nkab yog 0.42, uas yog ze li ob zaug siab.Yog hais tias nws yog siv nyob rau hauv pem teb cua sov, qhov no yog nws muaj zog point.Kev ua kom sov zoo txhais tau hais tias cov hluav taws xob hluav taws xob zoo dua, tab sis nws yog siv hauv cov kav dej kub.Qhov tsis zoo yog tias cov cua sov dissipation zoo, qhov kub poob yuav loj, thiab qhov kub ntawm cov yeeb nkab yuav siab dua, uas yooj yim rau hlawv.

4. Kev ua haujlwm vuam

Txawm hais tias ob qho tib si PPR cov kav dej thiab cov kav dej PE tuaj yeem ua kom kub-kua welded, PPR cov kav dej tau yooj yim rau kev khiav lag luam, thiab cov flanging ntawm PPR cov kav dej yog puag ncig, thaum lub flanging ntawm PE cov kav dej tsis zoo thiab yooj yim los thaiv;qhov vuam kub kuj txawv, PPR cov kav dej yog 260 ° C, PE cov kav dej kub yog 230 ° C, thiab cov tshuab tshwj xeeb vuam rau PPR cov kav dej hauv kev lag luam yog yooj yim tshaj-weld thiab ua rau cov dej to.Tsis tas li ntawd, vim tias cov khoom siv PE cov yeeb nkab dej yog yooj yim rau oxidize, cov cuab yeej tshwj xeeb yuav tsum tau siv los txhuam cov oxide ntawm daim tawv nqaij ua ntej vuam, txwv tsis pub cov yeeb nkab sib xyaw ua ke tsis tuaj yeem tsim, thiab cov yeeb nkab ua rau cov dej xau, yog li. kev tsim kho yog qhov teeb meem ntau dua.

5. Tsawg kub cuam tshuam lub zog:

Cov ntsiab lus no yog lub zog ntawm PE cov khoom siv yeeb nkab hauv cov ntsiab lus ntawm cov ntsuas.PPR cov kav dej muaj zog dua li cov kav dej PE, thiab cov kav dej PE tau hloov pauv ntau dua li cov kav dej PPR.Qhov no yog txiav txim los ntawm qhov xwm txheej ntawm cov khoom, tab sis nws tsis muaj nuj nqis rau exaggerate lub txias brittleness ntawm PPR cov kav dej., PPR cov kav dej tau siv hauv Suav teb rau ntau tshaj kaum xyoo.Cov neeg tsim khoom tau maj mam txo cov kev phom sij zais cia los ntawm kev tuav tsis raug los ntawm kev ntim khoom zoo thiab txhawb kev tshaj tawm.Kev ua phem thiab kev tsim kho yuav ua rau cov kav dej PE rau ntawm qhov chaw.Kos thiab kev ntxhov siab tawg;Thaum siv nyob rau hauv qhov kub thiab txias, txhua lub raj xa dej yuav tsum tau insulated, txwv tsis pub lub ntim expansion tshwm sim los ntawm khov yuav ua rau cov kav dej khov thiab tawg.PPR yeeb nkab yog cov yeeb nkab zoo tagnrho rau cov kav dej haus, thiab qhov chaw sab nraum zoov tsis zoo li sab hauv tsev.PE kav yog siv, uas kuj yog ib qho khoom siv zoo tshaj plaws rau cov kav dej hauv cov kav dej loj.

6. Cov yeeb nkab loj

Qhov loj tshaj plaws uas tuaj yeem ua los ntawm PE yeeb nkab yog dn1000, thiab qhov tshwj xeeb ntawm PPR yog dn160.Yog li, cov kav dej PE feem ntau yog siv los ua cov kav dej, thiab cov kav dej feem ntau yog PPR.