Liquid silicone roj hmab (LSR) yog ib qho khoom siv ceev ceev-kho nrog platinum (Pt) ua ib qho catalyst. Nws tuaj yeem tsim los ntawm kev txhaj tshuaj molding. Txoj kev txhaj tshuaj molding tuaj yeem ua tiav ntau lawm, kev sib txuas ceev ceev thiab kho, thiab rov ua dua thiab ruaj khov. .
Cov khoom ua kua silicone txhaj tshuaj muaj qhov zoo thermal stability, txias tsis kam thiab superior hluav taws xob rwb thaiv tsev, thiab yuav tsis tsim tshuaj lom thaum hlawv. Daim ntawv thov kev lag luam ntawm cov kua silicone yog dav heev, xws li cov khoom noj qab haus huv, tsheb, khoom siv me nyuam, cov khoom siv kho mob, cov khoom siv dhia dej, cov khoom siv hauv tsev, thiab cov khoom siv sealing, thiab lwm yam.
01 Cov txheej txheem tsim cov kua silicone roj hmab (LSR)
Cov txheej txheem molding ntawm cov kua silicone roj hmab (LSR) yuav tsum tsuas yog peb kauj ruam: "kev ntsuas thiab sib xyaw", " molding", thiab "kho thiab teeb tsa".
Cov kua roj hmab silicone (LSR) muaj cov dej ntws zoo heev, thiab nws muaj kev ruaj khov thiab yoog raws tom qab kho hauv cov pwm, kom cov kua silicone txhaj tshuaj tuaj yeem tsim nrog cov qauv nthuav dav txawv txawv thiab cov khoom siv hauv qab, uas yog lwm cov ntaub ntawv txhaj tshuaj, xws li yas lossis thermoplastic elastomers. thiab lwm yam ua tsis tau.
Liquid silicone roj hmab (LSR) feem ntau yog txhaj tshuaj molded los ntawm lub tshuab txhaj tshuaj. Cov khoom siv molding zoo ib yam li uas feem ntau siv rau cov thermoplastics, tab sis cov kev xav tau ntawm cov ntsiab lus tsis zoo ib yam.
Liquid silica roj hmab (LSR) yog ob-cov khoom siv los yog ob-cov khoom ua kua raw khoom, uas tau muab faib ua A kua tivthaiv thiab B kua tivthaiv. Cov ntim khoom lag luam feem ntau siv yog 20 kg (kwv yees li 5 nkas loos) pail lossis 200 kg (txog 55 nkas loos) nruas ntim. Lub thawv los yog lub nruas sib dhos yog muab tso rau hauv lub twj tso kua mis siab nruab nrog lub phaj ua raws li cov lus qhia kom thawb cov khoom ntim tawm ntawm lub nruas los ntawm cov twj tso kua mis siab, thiab siv cov cuab yeej sib xyaw kom raug sib xyaw A thiab B cov khoom ua kua. Hauv 1: 1 ratio Sib tov zoo. Tsis tas li ntawd, vim tias qee cov khoom tsim los nrog cov xim, nws tuaj yeem nruab ib pawg xim ntxiv cov twj tso kua mis thiab cov khoom siv xim metering nruab nrog cov ntaub ntawv xim kom tag nrho cov A kua, B kua, additives, cov ntaub ntawv xim, thiab lwm yam. tov khoom ua ntej qhia lawv mus rau hauv cov txheej txheem plastics. Hauv kev sib xyaw ua ke, qhov nruab nrab cua txias yuav tsum xyuas kom meej tias cov khoom sib tov tuaj yeem khaws cia ntawm qhov ntsuas kub tswj (10 ~ 20 degree) txhawm rau tiv thaiv qhov tshwm sim ntxov ntxov ntawm kev sib tshuam lossis kev kho cov tshuaj tiv thaiv, thiab cov kua silicone sib tov hauv lub xeev txias tuaj yeem nyob ruaj khov. rau ob peb hnub.
Cov ntsia hlau yas tshwj xeeb rau cov kua silicone muaj lub luag haujlwm ntawm homogenization thiab sib xyaw tib lub sijhawm. Qhov sib tov yog txhaj rau hauv qhov kub-kub molding pwm los ntawm cov ntsia hlau. Ntawm cov pwm kub ntawm 170 ~ 200 degree, qhov pib sib txuas cov tshuaj tiv thaiv yog tshwm sim los ua rau cov khoom siv silicone mus rau kev kho cov tshuaj tiv thaiv thiab kho cov khoom kawg. Thaum cov kua silicone pwm siv lub tshuab txias khiav txias, nws tsim nyog sau cia tias qhov kub ntawm cov neeg khiav yuav tsum qis thiab txias txaus. Tsis tas li ntawd, txhawm rau kom tsis txhob muaj cov khoom xau los yog kua nplaum, lub koob valve yuav raug ntsia rau ntawm qhov chaw ntawm qhov pwm, thiab lub koob valve yuav kaw tam sim ntawd tom qab txhaj tshuaj tiav.
02 Kev txiav txim siab rau molding thiab ua cov cuab yeej ua kua silicone roj hmab (LSR)
Cov khoom tseem ceeb ntawm cov kua silicone roj hmab txhaj tshuaj molding tshuab
• Vim tias cov kua roj hmab silicone tsis muaj viscosity tsawg, cov khoom siv rov qab thiab cov dej xau yuav tsum raug txiav txim siab thaum lub sijhawm ua haujlwm, yog li kev sib khi yuav tsum tau ua rau cov ntsia hlau txhaj tshuaj tseem ceeb heev.
• Txhawm rau tiv thaiv kom tsis txhob muaj qhov kub thiab txias ua ntej kho ntawm cov kua silicone roj hmab, kev tsim hluav taws xob rwb thaiv tsev ntawm lub tshuab txhaj tshuaj thiab pwm yog qhov tseem ceeb heev. Nws yog qhov zoo tshaj plaws los siv lub koob valve nozzle, thiab kaw lub nozzle tam sim ntawd tom qab txhaj tshuaj tiav.
• Sib tov thiab ntsuas cov cuab yeej rau ob yam ntawm cov kua A thiab kua B.
Quantitative feeding system
Quantitative feeding system muaj cov ntaub ntawv hauv qab no los xaiv:
• Lub twj tso kua mis ob-txoj kev tuaj yeem txav nce thiab nqis mus rau cov khoom noj, uas tuaj yeem ua kom muaj kev ruaj ntseg zoo dua. Lub twj tso kua mis A thiab B kua yog txuas thiab tswj synchronously los ntawm hydraulic thiab pneumatic mechanism. Yog li ntawd, hom kev pub mis no tuaj yeem tswj tau ntau dua. Metering thiab kev ntseeg siab.
• Lub twj tso kua mis ib-txoj kev yog hom dav dav, thiab tsuas tuaj yeem xaiv ib yam khoom los pub.
• Synchronous ib-txoj kev twj tso kua mis nrog tsis rov qab valve.
• Metering cylinder systems feem ntau yog siv ua ke nrog ib-txoj kev twj.
Pwm tsim
Nyob rau hauv cov nqe lus ntawm kev txiav txim siab tsim, feem ntau muaj cov hauv qab no:
• Cov txheej txheem kub khiav cov ntaub ntawv pov tseg, yooj yim hauv kev tsim thiab tsis tshua muaj nqi, thiab feem ntau yog siv rau cov khoom loj.
• Cov khiav txias nrog rab koob valve tuaj yeem siv tau thiab lub voj voog molding yog luv.
• Rau qhov kev khiav dej txias tsis muaj koob valve, vim qhov kev nthuav dav coefficient ntawm cov kua silicone roj hmab, nws yuav nthuav dav thaum cua sov, tab sis yuav txo qis me ntsis thaum txias, yog li cov khoom tiav tsis tuaj yeem tswj xyuas cov npoo npoo hauv pwm, yog li nws yog Xav paub ntau ntxiv tias rab koob valve txias khiav system yog siv rau kev ua haujlwm.
• Cov kua silicone yuav tsum tswj qhov kub thiab txias. Tus neeg khiav dej txias siv lub kaw lus kaw. Thaum lub sij hawm kev txhaj tshuaj, lub kaw lus kaw siv lub "kab koob" lossis "koob valve" hauv txhua qhov ntws los tswj cov kua roj hmab silicone. ntsuas qhov tseeb. Vim tias qhov zoo tshaj plaws thermal expansion yam ntxwv ntawm silicone roj hmab, tus nqi shrinkage yog 2 mus rau 4 feem pua (cov tshuaj tiv thaiv kho kub yog 150 degree), thiab silicone roj hmab muaj cov yam ntxwv ntawm compression deformation. Kev tsom xam ntawm cov kua silicone ntws / tshuaj tiv thaiv kho yog raws li hauv qab no:
• Cov tshuaj tiv thaiv thiab kho cov tshuaj tiv thaiv ntawm cov kua silicone yuav tsum muaj qee lub sij hawm cov tshuaj tiv thaiv.
• Ideal flow field (flow length ratio), in a flow channel with a diameter of 2mm and a length of 170cm, the flow distance of liquid silicone melt can exceed 100cm (L/t >500).
• Yam tsawg kawg nkaus thickness 1/1000mm.
• Cov pwm kub ntau dhau yuav ua rau kho ntxov ntxov ntawm reactive crosslinking, uas yuav ua rau muaj kev txwv tsis pub khiav.
• Laminar ntws tsis txhob muaj cua npuas.
• Kev txhaj tshuaj nrawm nrawm tuaj yeem ua rau muaj kev kub ntxhov.
• Cov viscosity ntawm cov khoom yuav hloov tus qauv ntws.
• Cov qauv turbulent lossis turbulent flow yuav ua rau cov pob dawb.
Raws li kev txheeb xyuas thiab kev piav qhia saum toj no, cov ntsiab lus tseem ceeb hauv qab no yuav tsum tau them sai sai rau hauv kev tsim pwm:
• Txhawm rau kom tsis txhob muaj kev kub ntxhov thiab lub dav hlau, siv cov pins me me los yog lub qhov rooj tis.
• Siv T-shaped qhia pins es tsis txhob siv cov cylindrical phau ntawv pins kom nce pwm qhov tseeb.
• Rwb thaiv tsev lossis panels yuav tsum tau ntxiv.
• Tsis txhob siv cov tshuaj tiv thaiv xeb / roj uas muaj cov tshuaj polymerization inhibitors. Feem ntau, toluene, xylene, thiab lwm yam tuaj yeem siv los so cov pwm. Tsis tas li ntawd, cov kua silicone kho tau yooj yim los lo rau ntawm cov hlau nto, thiab feem ntau siv cov txheej txheem demoulding xws li thimble ejection thiab cua ejection. Los ntawm cov ntaub ntawv saum toj no, nws tuaj yeem pom tias cov teeb meem tseem ceeb uas yuav tsum tau daws los ntawm silicone txhaj tshuaj molding tshuab yog qhov sib xyaw thiab ntsuas qhov chaw, nrog rau kev sib khi ntawm cov ntsia hlau thiab tsim cov pwm.
03 Xaus
Kev txhaj tshuaj molding ntawm cov kua silicone roj hmab yog cov txheej txheem ua haujlwm tshwj xeeb, yog li nws yuav tsum muaj kev nkag siab yooj yim ntawm cov kua silicone roj hmab (LSR), thiab muab cov qauv tsim nyog thiab raug thiab npaj hauv cov khoom tsim, pwm tsim thiab kev tsim khoom, thiab kom nkag siab txog kev txhaj tshuaj silicone ua kua. Lub hauv paus ntsiab lus ntawm molding thiab kev tsim cov txheej txheem tsim tau tuaj yeem zam cov teeb meem ntawm cov khoom thiab tsim cov khoom lag luam zoo, ua haujlwm siab ua kua silicone.
Kev txhaj tshuaj molding ua cov kua silicone roj hmab tam sim no yog kev lag luam nrog cov txiaj ntsig zoo ntawm kev lag luam, thiab muaj kev nce zuj zus hauv kev lag luam rau cov khoom siv silicone, thiab yuav muaj ntau thiab ntau cov khoom siv tshiab, uas yuav ua rau muaj pwm ntau ntxiv. Cov tuam txhab ua lag luam nqis peev hauv kev tsim cov khoom lag luam silicone, uas tseem yuav ua rau cov kua silicone txhaj tshuaj molding kev lag luam saw thiab kev lag luam muaj zog dua.