Polypropylene - Melting kub, zog thiab cov yam ntxwv

Polypropylene muaj ib tug melting point uas yuav tsum tau hu mus rau koj yog hais tias koj xav mus siv cov ntaub ntawv rau koj tus kheej lub hom phiaj, yog non-polar hluavtaws thermoplastic polymer uas belongs rau lub chav kawm ntawv ntawm polyolefins.

rau cov ntaub ntawv

Lwm lub npe hu polypropylene li cov khoom ntawm propylene polymerization. Cov khoom yog dawb nyob rau hauv cov xim thiab cov muaj ib tug khoom qauv. Qhov no yog npaj los ntawm lub polymerization ntawm propylene. Polymerization yog nqa tawm nyob rau hauv tus ntawm siab ntawm 10 atmospheres, lub kub yog khaws cia tsis pub dhau 80 ° C.

Molecular qauv thiab melting point

Polypropylene, lub melting point ntawm uas yuav muaj npe hauv qab no, lub hom molecular qauv yog muab faib ua peb yam:

• atactic;
• syndiotactic;
• isotactic.

Atactic polypropylene - ib tug roj hmab zoo li khoom uas muaj ib tug high degree ntawm fluidity. nws melting point yog 80 ° C, thaum lub sij hawm ceev yog 850 kg / m³. Qhov no cov ntaub ntawv uas yog tseem yus muaj los ntawm ib tug siab solubility nyob rau hauv diethyl ether.

Nws txawv nyob rau hauv nws tus yam ntxwv los ntawm cov saum toj no-piav isotactic polypropylene nyob rau hauv hais tias nws muaj ib tug high modulus ntawm elasticity, nws ceev nce mus txog ntawm 910 g / m³, whereas lub melting point yog ntau ntau thiab yog hom twg los ntawm 165 mus 170 ° C. Qhov no cov ntaub ntawv uas yog resistant rau tshuaj.

Physico-mechanical zog thiab specifications

Polypropylene muaj ib tug melting point twb hais saum toj no, txawv los ntawm lub polyethylene ntawm sab ceev, uas yog 0,91 g / cm³. Qhov no tus nqi no rau yas. Piav ntau cov khoom thiab ntau khoom, nws yog hais tias nws muaj ib tug high kuj mus puas.

Ntawm lwm yam, polypropylene, Thaum tshav kub kub-resistant, vim hais tias nws pib muag thaum kub nce mus txog 140 ° C. Lub melting kub yog 175 ° C, tas, cov khoom yog tshuam tsis raug kev nyuaj siab xeb ntes. Lub teeb resistant polypropylene ua pa. Introduction stabilizer lowers tus rhiab heev txawm ntau.

Polypropylene muaj ib tug melting point tej zaum koj yuav xav, yog tias koj npaj mus siv cov khoom siv no, thaum ncav us txog yuav coj txawv nyob ntawm seb kub thiab load daim ntawv thov ceev. Lub sab tus nqi ntawm kev ncab, ntau dua tus nqi ntawm tus neeg kho tshuab zog. Tensile rhuav kev nyuaj siab mas nws txawv ntawm 250 mus rau 400 kgf / cm², whereas lub elongation ntawm so yog los ntawm 200 mus rau 800%.

Lub melting point ntawm polypropylene ntawv, uas tau raug hais saum toj no, tsis yog yam ntxwv uas xav ntiav tau txais kev pab. Lawv tej zaum muaj kev txhawj xeeb ntau thiab FLEXURAL modulus. Nyob rau hauv lub tam sim no cov ntaub ntawv tej zaum nws yuav sib txawv los ntawm 6700 mus 11900 kgf. Thaum lub tawm los taw tes elongation yog sib npaug rau 10-20%. Impact zog nrog notch yog 33-80 kgf cm / cm². Brinell hardness yog 6-6.5 kg / mm².

kheej ntawm daim ntawv thov

Kev siv ntawm polypropylene yog dav. Cov khoom siv los ua films no muaj xws li ntim ntau ntau yam. Cov lwm yam khoom nws yog tsim nyog los faib:

• hnab;
• kav;
• yas khob;
• ntim;
• cov ntsiab lus ntawm kev cov khoom;
• tsev neeg cov khoom;
• insulating cov khoom;
• uas tsis yog-woven cov ntaub.

Nyob rau hauv kev tsim kho ntawm polypropylene kuj pom nws txoj kev, nws muaj nws yog siv rau kev co thiab cov suab nrov rho tawm cov plag tsev, raws li zoo li nyob rau hauv lub nruab uas hauv rau technology "floating pem teb". Thaum polypropylene yog copolymerized nrog ethylene, uas tsis yog-crystallizable copolymer yuav tau. Nws yuav muaj roj hmab yam ntxwv, uas muaj kuj rau cov laus thiab muaj high tshuaj kuj.

Rau thaum tshav kub kub thiab kev co yog dav siv txhab polypropylene. Lub melting kub ntawm lub polypropylene ntawv twb hais saum toj no, txawm li cas los, qhov no tsis yog yam ntxwv uas koj yuav tsum tau xav ua ntej yuav nriav cov khoom los ntawm cov khoom no. Nws yuav tsum tau paub hais tias lub txhab polypropylene yog heev uas zoo sib xws nyob rau hauv cov khoom mus rau polyethylene ua npuas ncauj. Tab sis EPS yuav hloov nrog ib tug zoo nkauj profile extrusion txhab polypropylene. Rau caulking, txoj kev coatings, siv adhesives, mastics thiab nplaum films nquag siv atactic polypropylene. Scope ntawm polypropylene nyob rau hauv Russia yog raws li nram no:

• 38% - ntim;
• 30% - xov;
• 18% - zaj duab xis;
• 6% - kav;
• 5% - polypropylene los xij;
• 3% - Lwm yam.

Lub melting point ntawm polypropylene kav

Lub melting point ntawm polypropylene kav - yog ib tug ntawm cov yam ntxwv, uas yog feem ntau txaus siab rau cov niaj hnub neeg. Qhov no cov ntaub ntawv uas pib mus soften ntawm 140 ° C thaum lub qhuav - 175 ° C. Kev xaiv lub xeem - nws yog qhov kub ntawm lub superheated chav. Yog hais tias peb xav txog qhov no xov tooj, lub polypropylene yuav siv tau rau tej dej haus system uas dej yog thauj nrog arbitrarily kub.

Tab sis tej yam uas yog tsis yog li ntawd yooj yim nyob rau hauv cov teeb meem no. Lub ductility ua raws li ib tug ntxiv feature ntawm cov khoom. Polypropylene ntawm so muaj ib tug elongation uas txawv tsis pub dhau lub ntau yam ntawm 200 mus rau 800%. Qhov no qhia tau hais tias yog hais tias tus yeeb nkab yuav muaj cuam tshuam los ntawm ib tug tej yam hnyav, ces cov khoom yuav muab ncua mus rau hauv ib tug ntev lub raj, thiab ces terminates.

Nyob rau hauv xaus: qhov xwm ntawm polypropylene

Cov khoom ntawm polypropylene, tus yam ntxwv thiab qhov xwm ntawm no cov ntaub ntawv uas yuav cia koj mus xyuas seb dab tsi cheeb tsam yog qhov zoo tshaj plaws los mus siv nws. Isotactic polypropylene yog tam sim no raws li cov feem ntau nrov nyob rau hauv lub lag luam. Qhov no yog vim cov yam ntxwv ntawm ntau yam ntawm cov ntaub ntawv uas, qhov tshwj xeeb qhov teeb meem nyob qhov twg lub sab pawg CH3, nyob yam txawv nrog hwm mus rau lub ntsiab saw. Tej kheej txhais yooj yim zoo yuav tsum muab sau ua ke ntawm lawv: muaj peev xwm mus khaws nws zoo nyob rau high school kub, hardness thiab siab zog.