Polypropylene hloov

Raws li qhov tsis zoo cuam tshuam ntawm polypropylene ntawm qhov kub thiab txias, huab cua tsis zoo, kev kho kom zoo nkauj tsis zoo, thiab qhov sib txawv ntawm nws cov haujlwm thiab cov kev xav tau tiag tiag ntawm cov hluav taws xob, hlau nplaum, lub teeb, cua sov, combustion, thiab lwm yam, polypropylene tau hloov kho rau ua Tam sim no, kev ua cov yas yog qhov chaw nquag tshaj plaws ntawm txoj kev loj hlob thiab tau ua tiav cov txiaj ntsig zoo tshaj plaws.
PP tshuaj hloov kho
Los ntawm kev hloov pauv copolymerization, kev hloov pauv kev sib txuas, kev hloov pauv hloov pauv, ntxiv cov tshuaj nucleating, thiab lwm yam, cov khoom siv polymer thiab cov qauv macromolecular lossis crystal configuration ntawm polypropylene raug hloov los txhim kho nws cov khoom siv hluav taws xob, tiv thaiv tshav kub, thiab kev laus. thiab lwm yam khoom, txhim kho nws cov kev ua tau zoo thiab nthuav dav nws daim ntawv thov.
(1) Copolymerization hloov kho
Kev hloov pauv ntawm copolymerization yog kev hloov kho uas tau ua nyob rau hauv theem propylene monomer synthesis siv cov catalysts xws li metallocenes. Thaum cov monomers yog polymerized, ntxiv olefin monomers yog copolymerized nrog lawv kom tau random copolymer, thaiv copolymers, alternating copolymers, thiab lwm yam. . Lub complex tsim los ntawm metallocene catalyst siv lub xeev kev hloov pauv nrog cov duab tsis xwm yeem thiab qee qhov kev txwv raws li ib qho chaw ua haujlwm kom ua tiav kev tswj xyuas meej ntawm cov txheeb ze molecular hnyav thiab kev faib tawm, cov ntsiab lus comonomer, faib rau ntawm cov saw tseem ceeb thiab polymer siv lead ua daim ntawv. qauv.
(2) Kev hloov pauv hloov pauv
PP (polypropylene) resin molecules muaj cov qauv uas tsis yog-polar crystalline linear, ua haujlwm qis thiab tsis muaj polarity. Muaj qhov tsis zoo xws li kev luam tawm tsis zoo, tsis zoo txheej adhesion, nyuaj rau kev sib xyaw nrog cov polar polymers, thiab nyuaj rau kev sib raug zoo nrog cov polar reinforcing fibers thiab fillers. Kev hloov kho Graft yog los qhia cov pawg polar rau hauv nws cov macromolecular saw los txhim kho kev sib xyaw, sib xyaw thiab adhesion ntawm PP thiab kov yeej qhov tsis txaus ntawm qhov nyuaj hauv kev sib xyaw, sib xyaw thiab adhesion. Nyob rau hauv qhov kev txiav txim ntawm tus pib, lub grafting monomer undergoes grafting cov tshuaj tiv thaiv thaum melting thiab sib tov. Tus pib decomposes los tsim cov dawb radicals thaum rhuab, yaj, thiab rhuab. Thaum cov active dawb radicals ntsib cov unsaturated carboxylic acid monomer, lub unsaturated carboxylic acid monomer yog tom qab lub unstable daim ntawv cog lus ntawm cov kua qaub monomer yog qhib, nws reacts nrog lub active dawb radicals ntawm PP los tsim graft dawb radicals, uas yog tom qab txiav los ntawm ib tug active dawb radicals. molecular saw hloov cov tshuaj tiv thaiv. Cov kev hloov kho graft feem ntau ntawm PP suav nrog: txoj kev yaj, txoj kev daws teeb meem, cov txheej txheem txheej txheem, txoj kev raug ncua, thiab lwm yam. Cov hydrogen atoms nyob rau hauv graft-hloov PP molecular saw yog hloov thiab ua ntau polar. Cov pawg polar no txhim khu kev sib raug zoo ntawm PP thiab txhim kho nws cov cua sov thiab cov khoom siv kho tshuab zoo heev.
(3) Kev hloov pauv kev sib txuas
Kev hloov pauv kev sib txuas feem ntau yog hloov kho cov linear lossis dendritic polymers rau hauv cov polymers nrog cov qauv sib txuas los ntawm kev sib txuas. Kev sib txuas ntawm kev hloov pauv ntawm PP (polypropylene) tuaj yeem txhim kho nws cov khoom siv kho tshuab, tiv thaiv tshav kub thiab kev ruaj ntseg morphological, thiab txo lub voj voog molding. Cov txheej txheem tseem ceeb ntawm kev hloov pauv ntawm kev sib txuas ntawm polypropylene muaj xws li tshuaj lom neeg sib txuas hloov kho thiab hluav taws xob sib txuas hloov kho. Qhov sib txawv tseem ceeb ntawm lawv yog cov txheej txheem sib txuas sib txawv thiab cov khoom siv sib txawv; chemical cross-linking modification yog ua tiav los ntawm kev ntxiv cov kev sib txuas sib txuas rau polypropylene. Kev hloov kho, hluav taws xob sib txuas kev hloov kho feem ntau yog ua tiav los ntawm cov hluav taws xob muaj zog lossis lub teeb muaj zog. Vim yog qhov yuav tsum tau ua ntawm cov tuab ntawm PP rau kev hloov pauv hluav taws xob sib txuas, nws nyuaj rau kev nyiam cov qauv no. Tam sim no, silane graft cross-linking txoj kev tab tom txhim kho sai vim tias nws tuaj yeem tsim cov khoom zoo heev. PP ua los ntawm silane graft cross-linking txoj kev muaj lub zog siab, zoo tshav kub tsis kam, siab yaj lub zog, muaj zog tshuaj stability, thiab corrosion kuj. zoo.
PP lub cev hloov kho
Thaum lub sij hawm sib tov thiab kneading txheej txheem, cov organic lossis inorganic additives yog ntxiv rau PP (polypropylene) matrix kom tau PP cov ntaub ntawv sib xyaw nrog kev ua tau zoo, uas feem ntau suav nrog: kev hloov kho, kev hloov pauv, thiab lwm yam.