PP polypropylene
Cov ntawv thov dav dav:
Kev lag luam tsheb (feem ntau yog siv PP uas muaj cov hlau ntxiv: cov khoom siv av nkos, cov kav dej cua, cov kiv cua, thiab lwm yam), cov khoom siv (lub qhov rooj ntxuav tais diav, cov kav dej cua tshuab, cov thav duab thiab cov npog ntawm lub tshuab ntxhua khaub ncaws, cov qhov rooj tub yees, thiab lwm yam), Nyiv Pooj Siv cov khoom siv rau cov neeg siv khoom (cov khoom siv vaj thiab vaj xws li
Cov tshuab txiav nyom thiab cov dej txau, thiab lwm yam).
Cov xwm txheej ntawm kev txhaj tshuaj pwm:
Kev kho kom qhuav: Yog tias khaws cia kom zoo, tsis tas yuav kho kom qhuav.
Kub yaj: 220 ~ 275 ℃, ceev faj tsis txhob tshaj 275 ℃.
Qhov kub ntawm pwm: 40 ~ 80 ℃, 50 ℃ yog qhov pom zoo. Qhov degree ntawm crystallization feem ntau yog txiav txim siab los ntawm qhov kub ntawm pwm.
Kev txhaj tshuaj siab: txog li 1800bar.
Kev txhaj tshuaj ceev: Feem ntau, kev siv kev txhaj tshuaj ceev ceev tuaj yeem txo qhov siab sab hauv kom tsawg kawg nkaus. Yog tias muaj qhov tsis zoo ntawm qhov chaw ntawm cov khoom, yuav tsum siv kev txhaj tshuaj ceev qis ntawm qhov kub siab dua.
Cov neeg khiav thiab rooj vag: Rau cov neeg khiav txias, qhov feem ntau ntawm cov neeg khiav yog 4 ~ 7 hli. Nws raug pom zoo kom siv lub qhov rooj txhaj tshuaj thiab tus neeg khiav ncig. Txhua hom rooj vag tuaj yeem siv tau. Lub qhov rooj feem ntau yog txij li 1 txog 1.5 hli, tab sis cov rooj vag me me li 0.7 hli kuj tuaj yeem siv tau. Rau cov rooj vag ntug, qhov tob tsawg kawg nkaus ntawm lub rooj vag yuav tsum yog ib nrab ntawm phab ntsa tuab; qhov dav tsawg kawg nkaus ntawm lub rooj vag yuav tsum yog tsawg kawg yog ob npaug ntawm phab ntsa tuab. Cov khoom siv PP tuaj yeem siv lub kaw lus khiav kub.
Cov khoom siv tshuaj lom neeg thiab lub cev:
PP yog ib yam khoom siv semi-crystalline. Nws nyuaj dua PE thiab muaj qhov melting point siab dua. Vim tias homopolymer PP yog brittle heev thaum qhov kub siab dua 0 ° C, ntau cov khoom lag luam PP yog random copolymers nrog 1 txog 4% ethylene lossis clamp copolymers nrog cov ntsiab lus ethylene ntau dua. Copolymer PP khoom muaj qhov kub thermal distortion qis dua (100 ° C), tsis tshua muaj pob tshab, tsis tshua muaj gloss, tsis tshua muaj rigidity, tab sis muaj zog cuam tshuam ntau dua. Lub zog ntawm PP nce nrog rau qhov nce ntawm ethylene. Vicat softening kub ntawm PP yog 150 ° C. Vim yog qhov crystallinity siab, qhov rigidity ntawm qhov chaw thiab khawb tsis kam ntawm cov khoom no zoo heev. PP tsis muaj teeb meem ntawm kev tawg ntawm ib puag ncig. Feem ntau, PP raug hloov kho los ntawm kev ntxiv cov iav fiber, cov hlau ntxiv lossis cov roj hmab thermoplastic. Tus nqi ntws MFR ntawm PP ntau ntawm 1 txog 40. PP cov khoom siv nrog MFR qis muaj kev tiv thaiv zoo dua tab sis qis dua elongation zog. Rau cov khoom siv nrog tib MFR, lub zog ntawm hom copolymer siab dua li ntawm hom homopolymer. Vim yog crystallization, tus nqi shrinkage ntawm PP yog siab heev, feem ntau 1.8 ~ 2.5%. Thiab qhov kev taw qhia uniformity ntawm shrinkage zoo dua li ntawm PE-HD thiab lwm yam khoom siv. Ntxiv 30% ntawm cov iav additives tuaj yeem txo qhov shrinkage mus rau 0.7%. Ob qho tib si homopolymer thiab copolymer PP cov ntaub ntawv muaj kev nqus dej zoo heev, acid thiab alkali corrosion tsis kam, thiab solubility tsis kam. Txawm li cas los xij, nws tsis muaj kev tiv thaiv rau aromatic hydrocarbons (xws li benzene) cov kuab tshuaj, chlorinated hydrocarbons (carbon tetrachloride) cov kuab tshuaj, thiab lwm yam. PP tsis muaj oxidation tsis kam ntawm qhov kub siab zoo li PE.

Peb licov diav yas, cov raj kuaj yas, cov tshuaj nqus pa hauv qhov ntswgthiab lwm yam khoom uas kov tau tib neeg lub cev siv cov ntaub ntawv PP. Peb muaj cov ntaub ntawv kho mob PP thiab cov ntaub ntawv PP zaub mov. Vim tias cov ntaub ntawv PP tsis muaj tshuaj lom.