Peb qhov kev faib tawm loj thiab kev sib piv kev ua tau zoo ntawm polypropylene (PP)

Polypropylene (PP) yog cov thermoplastic resin nrog qhov ceev tsawg tshaj plaws. Nws tuaj yeem muab faib ua homopolypropylene (PP-H) thiab copolymerized polypropylene. Copolymerized polypropylene yog muab faib ntxiv rau hauv thaiv (cuam tshuam-resistant) copolymerized polypropylene (PP-H). B) thiab random (random) copolymerized polypropylene (PP-R). Muaj ntau hom PP cov ntaub ntawv, yog li lawv qhov sib txawv yog dab tsi? Hnub no peb yuav kawm txog ntau yam PPs nrog koj.

PP-H

Nws yog polymerized los ntawm ib qho propylene monomer, nws yog qhov ceev tsawg tshaj plaws ntawm cov yas feem ntau. Nws cov saw molecular yog qhov sib xws heev, yog li cov khoom siv muaj crystallinity siab thiab cov khoom cuam tshuam tsis zoo.

Qhov zoo: lub zog zoo dua thiab kev tiv thaiv corrosion zoo dua.

Qhov tsis zoo: tsis kam rau kev cuam tshuam (brittle), tsis muaj zog, tsis ruaj khov, yooj yim laus, tsis kam tiv taus cua sov thiab ruaj khov mus sij hawm ntev, thiab tsis zoo rau cov pa oxygen, carbon dioxide thiab lwm yam roj.

Kev Siv: Siv tau rau cov ntaub qhwv, lub raj mis cua tshuab, txhuam, hlua, hnab ntaub, cov khoom ua si, cov ntawv tais ceev tseg, cov khoom siv hluav taws xob, cov khoom siv hauv tsev, cov thawv noj su microwave, cov thawv cia khoom, thiab cov ntawv qhwv.

Yuav ua li cas txheeb xyuas: Thaum hlawv los ntawm hluav taws, cov hlau yuav tiaj tus thiab tsis ntev.

PP-B

Nws tau txais los ntawm kev sib xyaw ua ke ntawm propylene thiab ib feem ntawm ethylene. Cov ntsiab lus ethylene feem ntau yog 7 txog 15%. Txawm li cas los xij, vim tias qhov muaj feem yuav muaj ob lub ethylene monomers thiab peb lub monomers txuas ua ke hauv PP-B siab heev, nws txhais tau tias ethylene monomer tsuas yog nyob hauv theem ntu, qhov tsis tu ncua ntawm PP-H tsis txo qis, yog li lub hom phiaj ntawm kev txhim kho qhov melting point, kev tiv thaiv hydrostatic siab ntev, kev tiv thaiv cua sov ntev thiab kev ua yeeb nkab thiab tsim cov khoom ntawm PP-H tsis tuaj yeem ua tiav.

Qhov zoo: kev cuam tshuam zoo dua.

Qhov tsis zoo: tsis tshua muaj pob tshab, tsis tshua muaj gloss, tsis kam rau kev nqus dej noo, acid thiab alkali corrosion tsis kam, solubility tsis kam thiab oxidation tsis kam ntawm qhov kub siab.

Kev Siv: Siv rau hauv cov bumpers, cov khoom nyias nyias, strollers, cov khoom siv kis las, cov khoom siv, cov thoob pleev xim, cov thawv roj teeb, thiab cov khoom nyias nyias.

Yuav ua li cas txheeb xyuas: Nws tsis tig dub tom qab raug hluav taws thiab tuaj yeem rub tawm cov xov hlau ntev heev.

PP-R

Nws yog tau los ntawm kev sib xyaw ua ke propylene monomer thiab me me ntawm ethylene (1-4%) monomer nyob rau hauv qhov kev ua ntawm cua sov, siab thiab catalyst. Lub ethylene monomer raug faib ua random thiab random rau hauv cov saw ntev ntawm propylene. Kev ntxiv random ntawm ethylene txo qhov crystallinity thiab melting point ntawm cov polymer, txhim kho cov khoom siv cuam tshuam, kev tiv thaiv mus sij hawm ntev rau hydrostatic siab, kev tiv thaiv mus sij hawm ntev rau thermal oxygen laus thiab cov yeeb nkab ua thiab molding.

Cov qauv ntawm PP-R molecular saw, ethylene monomer cov ntsiab lus thiab lwm yam ntsuas muaj feem cuam tshuam ncaj qha rau lub sijhawm ntev thermal stability, mechanical properties thiab processing efficiency ntawm cov khoom. Qhov ntau random qhov kev faib tawm ntawm ethylene monomer hauv propylene molecular saw, qhov ntau tseem ceeb qhov kev hloov pauv ntawm polypropylene cov khoom yuav yog.

Qhov zoo: kev ua tau zoo tag nrho, lub zog siab, kev nruj siab, kev tiv taus cua sov zoo, kev ruaj khov zoo, kev tawv tawv zoo heev thaum kub qis (kev ywj pheej zoo), pob tshab zoo, thiab ci ntsa iab zoo.

Qhov tsis zoo: Kev ua tau zoo tshaj plaws ntawm PP.

Kev Siv: Siv rau hauv cov kav dej, cov yeeb yaj kiab ntsws, cov fwj dej ntws, cov thawv pob tshab heev, cov khoom siv hauv tsev pob tshab, cov koob txhaj tshuaj pov tseg, thiab cov ntawv ntim khoom.

Yuav ua li cas txheeb xyuas: Nws tsis tig dub tom qab raug hluav taws thiab tuaj yeem rub tawm cov xov hlau ntev heev.

Kev sib piv ntawm peb hom polypropylene

Lub zog tensile: homopolypropylene> thaiv copolymerized propylene> random copolymerized propylene

Kev Rigidity: Homopolypropylene > Block copolymerized propylene > Random copolymerized propylene

Lub zog cuam tshuam: thaiv copolymerized propylene> random copolymerized propylene> homopolymerized propylene

Pob tshab: Random copolymerized propylene> Homopolymerized propylene> Thaiv copolymerized propylene

Kev kub tsis tshua muaj zog: thaiv copolymerized propylene > random copolymerized propylene > homopolymerized propylene