BMC yog ib lub npe luv ntawmCov Tshuaj Molding NtauHauv lus Askiv, lub npe Suav yog Bulk Molding Compound (tseem hu ua: unsaturated polyester iav fiber reinforced Bulk Molding Compound) los ntawm cov kua resin, tus neeg sawv cev qis shrinkage, tus neeg sawv cev crosslinking, initiator, filler, luv luv iav fiber flakes thiab lwm yam khoom ntawm lub cev sib xyaw ntawm cov khoom sib xyaw, nyob rau hauv qhov kub thiab txias thiab siab, qhov crosslinking ntawm unsaturated polyester thiab styrene, polymerization reaction tshwm sim. Nyob rau hauv kub thiab siab, unsaturated polyester thiab styrene yog cross-linked thiab kho los ntawm polymerization reaction. Nws cov khoom siv kho tshuab zoo heev thiab cov khoom hluav taws xob zoo heev, thiab kev tiv taus cua sov thiab cov khoom ua tau zoo yog siv dav hauv cov khoom siv hluav taws xob, cov cuab yeej siv, kev tsim tsheb, kev tsav dav hlau, kev thauj mus los, kev tsim kho.
Cov txheej txheem tsim qauv
1. Cov tshuaj polyester tsis muaj roj: nrog smc / bmc tshwj xeeb resin, feem ntau yog m-phenyl li, cuam tshuam tsis kam, corrosion tsis kam, arc tsis kam, tsim nyog rau kev tsim cov khoom thaiv lossis anisotropic
2. Tus neeg sawv cev hla kev sib txuas; nrog monomer styrene, qhov ntau ntawm up30% ~ 40%, nyob ntawm cov ntsiab lus ntawm cov ntawv cog lus ob npaug hauv cov polyester tsis muaj zog thiab qhov sib piv ntawm cov ntawv cog lus ob npaug trans thiab cis ob npaug, qhov sib piv siab ntawm cov monomers hla kev sib txuas, tuaj yeem tau txais kev kho kom tiav dua
3. Tus pib nrog tus neeg sawv cev kub kub, tert-butyl peroxybenzoate (TBPB) yog ib tus neeg sawv cev kub kub uas siv ntau, qhov kub ntawm cov kua dej decomposition yog 104 degrees molding kub yog 135 txog 160 degrees.
4. Cov khoom siv thermoplastic uas tsis tshua muaj shrinkage feem ntau siv, siv cua sov nthuav dav los pab txhawb kev sib txuas ntawm cov pwm. Feem ntau, qhov nrawm ntawm cov khoom yuav tsum tswj tau ntawm 0.1 ~ 0.3%, yog li cov tshuaj yuav tsum tau tswj hwm nruj me ntsis.
5. Cov ntaub ntawv txhawb zog: feem ntau siv cov txheej txheem txuas 6 ~ 12 hli ntev luv luv fibers 6 nplaim taws retardant siv Al2O3.3H2O-raws li, ntxiv me ntsis ntawm cov phosphorus-muaj nplaim taws retardant tshiab, hydrated alumina kuj ua lub luag haujlwm ntawm filler 7. Fillers tuaj yeem txo tus nqi ntawm kev txhim kho cov khoom hluav taws xob thiab nplaim taws retardancy. Calcium carbonate yog cov filler siv ntev tshaj plaws nrog kev ua tau zoo tag nrho, feem ntau yog nyob rau hauv daim ntawv ntawm zoo, micropowder tom qab kev kho mob txuas thiab tom qab ntawd ntxiv.
Cov txheej txheem BMC
1. Ua tib zoo saib xyuas qhov sib ntxiv ntawm cov khoom siv. Sib xyaw hauv lub tshuab z-hom kneading, lub tshuab kneading muaj lub cuab yeej cua sov, seb qhov sib tov puas sib xws tuaj yeem pom cov xim nplaum lossis cov xim carbon sib xws, li 15 ~ 18 feeb
2. Cov iav fiber luv luv los koom nrog qhov kawg, thaum ntxov los koom nrog ntau cov fibers tawg, cuam tshuam rau lub zog ntawm
3. Cov khoom siv BMC yuav tsum khaws cia rau qhov kub qis, feem ntau ntawm 10 degrees Celsius, qhov kub siab, cov resin unsaturated yooj yim rau kev sib txuas thiab kho, thiab tom qab ntawd ua cov teeb meem molding.
4. Qhov kub ntawm pwm: 140 degrees lossis li ntawd, qhov kub ntawm pwm sab saud thiab sab qis yog 5 ~ 10 degrees, qhov siab ntawm pwm yog 7mpa lossis li ntawd, lub sijhawm tuav yog 40 ~ 80s/mm
Kev kuaj mob hauv kev lag luam
1. Khoom tawg: teeb meem tawg yog ib qho teeb meem uas tshwm sim ntau, tshwj xeeb tshaj yog thaum lub caij ntuj no kub qis. Qhov hu ua tawg yog hais txog cov khoom los ntawm kev ntxhov siab sab hauv, kev cuam tshuam sab nraud lossis ib puag ncig thiab lwm yam kev cuam tshuam rau ntawm qhov chaw lossis sab hauv tawg.
2. Kev daws teeb meem; tshwj xeeb los ntawm cov khoom siv raw, qhov sib piv thiab cov txheej txheem los daws.
2.1 Kev xaiv thiab kev ua cov khoom siv raw
1) Resin yog lub matrix ntawm bmc, unsaturated polyester resin, vinyl ester,phenolic resin, melamine, thiab lwm yam. Resin yog cov khoom kho, nrog lub zog tseem ceeb. Yog li ntawd, kev siv smc / bmc tshwj xeeb resin, yog m-phenylene hom resin, m-phenylene resin dua li o-phenylene hom ntawm viscosity siab, yog li ntxiv rau cov resin nws tus kheej shrinkage yog me me, tuaj yeem txais ntau crosslinking monomers, yog li ntawd qhov ceev ntawm qhov ceev nce, shrinkage tus nqi txo qis
(2) ntxiv cov khoom sib xyaw ua ke uas tsis tshua muaj zog; cov polyester resin tsis muaj zog kho qhov sib txuas ntawm txog li 5 ~ 8%, ntxiv ntau yam khoom siv filler shrinkage tseem ntau dua 3%, cov khoom feem ntau shrinkage ntau dua 0.4% kom tawg, yog li ntxiv cov thermoplastic resins, kev siv cov thermoplastic resins kom tshem tawm thermal expansion ntawm qhov kho qhov sib txuas ntawm cov khoom. pmma, ps ntxiv thiab monomer styrene sib tov thiab yaj ntawm qhov zoo dua, ntxiv pmma Qhov tiav zoo dua. Cov khoom shrinkage tuaj yeem tswj tau ntawm 0.1 ~ 0.3%.
(3) cov khoom siv filler, nplaim taws retardant, iav fiber; iav fiber ntev - feem ntau 6 ~ 12 hli, qee zaum kom tau raws li cov khoom siv kho tshuab siab txog 25 hli; txhawm rau kom tau raws li qhov yuav tsum tau ua ntawm molding fluidity, txog 3 hli. Cov ntsiab lus iav fiber feem ntau yog 15% ~ 20%; rau cov khoom ua tau zoo, txog 25%. BMC iav fiber cov ntsiab lus qis dua SMC, koj tuaj yeem ntxiv ntau cov khoom siv filler, yog li tus nqi qis dua kom ua cov khoom siv inorganic filler. Qis dua kom ua rau cov khoom siv inorganic filler, nplaim taws retardant, iav fiber thiab resin muaj kev sib xyaw ua ke ntawm kev siv dav dav ntawm silane coupling agent kho ua ntej sib tov, feem ntau siv KH-560, KH-570 cov nyhuv zoo rau kev koom ua ke cov khoom khov kho yog cov khoom zoo, cov khoom siv micronized, xws li calcium carbonate hnyav nrog qib micronized, qhov loj me me 1 ~ 10um (sib npaug rau 1250 mesh)
2.2 Qhov yuav tsum tau ua kom BMC sib piv ntawm Bmc base resin, qhov ntau yuav tsum tsis pub tsawg dua 20%, nws qhov ntau ntawm cov initiator cuam tshuam nrog qhov ntau ntawm cov neeg sawv cev crosslinking yeej tsis tas yuav ntxiv qhov ntau ntawm cov neeg sawv cev crosslinking hauv cov ntsiab lus resin suav txog 35%, ntxiv rau qhov ntau ntawm cov neeg sawv cev qis kom koom nrog kuj nyob ntawm qhov ntau ntawm cov resin. Kev siv cov neeg sawv cev kho kub siab TBPB, cov khoom sau thiab cov nplaim taws retardant (aluminium hydroxide) los koom nrog tag nrho cov nyiaj ntawm kwv yees li 50% yog qhov tsim nyog dua, yog ob npaug ntau dua li cov resin, ntau dhau los koom nrog lub zog ntawm cov qauv puas tsuaj, yooj yim tawg!
2.3 Cov xwm txheej ntawm cov txheej txheem tsim khoom
(1) sib tov, ua ntej tshaj plaws, thaum sib tov cov khoom kom sib tov sib npaug, cov hmoov ua ntej ntxiv qhov hnyav me me, thiab tom qab ntawd ntxiv qhov hnyav loj, cov kua sib tov ua ntej thiab tom qab ntawd ntxiv, tus pib yog qhov kawg uas yuav tsum tau ntxiv, cov khoom siv tuab yuav tsum tau ntxiv ua ntej cov tshuaj nplaum thiab polystyrene kneading. Iav fiber ntxiv rau hauv cov khoom ua ke
(2) cov txheej txheem molding: cov txheej txheem molding cuam tshuam ncaj qha rau cov khoom zoo lossis phem. Feem ntau nrog kev nce ntawm kev siab molding, shrinkage txo qis. Qhov kub ntawm pwm siab dhau yuav tsim cov kab sib xyaw ua ke, cov khoom tsis sib xws, kev ntxhov siab sab hauv txawv, yooj yim tawg. Tuav lub siab rau lub sijhawm ntev yog qhov zoo rau kev tiv thaiv kev tawg ntawm cov khoom.
(3) preheating rwb thaiv tsev system: qhov kub qis yog qhov yooj yim tawg. Yog li ntawd, cov khoom yuav tsum tau preheated
Lub sijhawm tshaj tawm: Lub Rau Hli-10-2025
