Polypropylene (PP) yog thermoplastic "ntxiv polymer" ua los ntawm kev sib xyaw ntawm propylene monomers. Nws yog siv nyob rau hauv ntau yam kev siv xws li ntim khoom rau cov neeg siv khoom, cov khoom yas rau ntau yam kev lag luam nrog rau kev lag luam tsheb, cov cuab yeej tshwj xeeb xws li cov pob khawm nyob, thiab textiles.
1. Kev kho cov yas.
Pure PP yog translucent ivory dawb thiab tuaj yeem dyed hauv ntau xim. Rau PP dyeing, tsuas yog xim masterbatch tuaj yeem siv dav davtxhaj tshuaj moldingtshuab. Cov khoom siv sab nraum zoov feem ntau tau ntim nrog UV stabilizers thiab carbon dub. Kev siv cov khoom siv rov ua dua yuav tsum tsis pub tshaj 15%, txwv tsis pub nws yuav ua rau lub zog poob thiab decomposition thiab discoloration.
2. Kev xaiv ntawm kev txhaj tshuaj molding tshuab
Vim tias PP muaj crystallinity siab. Lub tshuab computer txhaj tshuaj molding tshuab nrog kev txhaj tshuaj siab dua thiab kev tswj ntau theem yog xav tau. Lub clamping quab yuam feem ntau txiav txim siab ntawm 3800t / m2, thiab qhov ntim ntim yog 20% -85%.
3. Pwm thiab rooj vag tsim
Cov pwm kub yog 50-90 ℃, thiab pwm kub kub yog siv rau qhov loj dua qhov yuav tsum tau ua. Qhov kub ntawm cov tub ntxhais yog ntau tshaj 5 ℃ qis dua qhov kub ntawm kab noj hniav, txoj kab uas hla yog 4-7 hli, rab koob qhov rooj ntev yog 1-1.5 hli, thiab txoj kab uas hla tuaj yeem me me li 0.7 hli. Qhov ntev ntawm lub rooj vag ntug yog luv li sai tau, txog 0.7 hli, qhov tob yog ib nrab ntawm phab ntsa tuab, thiab qhov dav yog ob zaug ntawm phab ntsa tuab, thiab nws yuav maj mam nce nrog qhov ntev ntawm cov yaj ntws hauv cov kab noj hniav. Cov pwm yuav tsum muaj qhov cua zoo. Lub qhov taub yog 0.025mm-0.038mm tob thiab 1.5mm tuab. Txhawm rau kom tsis txhob muaj cov cim shrinkage, siv lub taub loj thiab puag ncig thiab lub voj voog khiav, thiab lub thickness ntawm cov tav yuav tsum me me. Lub thickness ntawm cov khoom ua los ntawm homopolymer PP tsis tuaj yeem tshaj 3 hli, txwv tsis pub yuav muaj npuas.
4. Melting kub
Lub melting point ntawm PP yog 160-175 ° C, thiab qhov decomposition kub yog 350 ° C, tab sis qhov kub thiab txias tsis tuaj yeem tshaj 275 ° C thaum txhaj tshuaj. Qhov kub ntawm thaj tsam melting yog nyiam dua 240 ° C.
5. Kev txhaj tshuaj ceev
Txhawm rau txo qis kev ntxhov siab thiab deformation, kev txhaj tshuaj nrawm yuav tsum raug xaiv, tab sis qee qib ntawm PP thiab pwm tsis haum. Yog hais tias tus qauv nto tshwm nrog lub teeb thiab tsaus kab txaij diffused los ntawm lub rooj vag, kev txhaj tshuaj qis qis thiab kub pwm yuav tsum tau siv.
6. Melt nplaum rov qab siab
5bar yaj nplaum rov qab siab tuaj yeem siv tau, thiab rov qab siab ntawm cov khoom siv toner tuaj yeem hloov kho kom tsim nyog.
7. Kev txhaj tshuaj thiab kev ceev ceev
Siv kev txhaj tshuaj siab dua (1500-1800bar) thiab tuav lub siab (li 80% ntawm kev txhaj tshuaj siab). Hloov mus tuav lub siab ntawm li 95% ntawm tag nrho cov hlab ntsha tawg, thiab siv lub sijhawm tuav ntev dua.
8. Tom qab ua tiav cov khoom
Txhawm rau tiv thaiv qhov shrinkage thiab deformation tshwm sim los ntawm post-crystallization, cov khoom feem ntau yuav tsum tau ntub dej.d hauv dej kub.
Post lub sij hawm: Feb-25-2022
