Kev sib xyaw thiab kev siv cov ntawv Moulding Compound

Sheet molding compound yog hais txog unsaturated polyester resin raws li lub cev tseem ceeb, ntxiv curing agent, pwm tso tus neeg sawv cev, muab tub lim, tsis tshua muaj shrinkage tus neeg saib xyuas, thickener, thiab lwm yam molding compound npog nrog polyethylene (PE) zaj duab xis.Daim ntawv no tsuas yog luv luv piav qhia txog qhov muaj pes tsawg leeg thiab kev faib tawm ntawm SMC.

Sheet Molding Compound's Composition

SMC yog tsim los ntawm unsaturated polyester cob, crosslinking tus neeg sawv cev, pib, muab tub lim, thickener, tso tawm tus neeg sawv cev, iav fiber, thiab polymerization inhibitor.Ntawm lawv, thawj plaub pawg tsuas yog muab cov khoom siv rau cov khoom thiab ua kom muaj zog.Cov plaub pawg kawg yog feem ntau yog rau cov khoom ntawm kev nce viscosity, corrosion kuj, rwb thaiv tsev, thiab kev ruaj ntseg ntawm cov khoom.

1. Unsaturated polyester resin thiab crosslinking agents yog lub cev tseem ceeb ntawm SMC.Unsaturated polyester resins feem ntau yog polycondensed los ntawm unsaturated dicarboxylic acids (los yog anhydrides), saturated dicarboxylic acids (los yog anhydrides), thiab polyols.Nws muaj qee yam khoom siv thiab lub zog, thiab lub zog sab hauv yog sib xws.Tus neeg sawv cev crosslinking feem ntau yog styrene.Tom qab ob qho tib si hla kev sib txuas, lawv yog cov ntaub ntawv tseem ceeb rau kev kho plasticity ntawm cov khoom, uas ua lub luag haujlwm ntawm kev sib txuas, kev txhawb nqa, sib npaug sib npaug, thiab kev tiv thaiv.

2. Tus neeg pib ua rau cov resin thiab crosslinker los kho thiab tsim nyob rau hauv lub resin paste theem.Nws txoj haujlwm yog tsuas yog ua kom cov resin thiab ob daim ntawv cog lus nyob rau hauv cross-linking monomer xws li styrene copolymerize kom cov SMC tuaj yeem ua kom ruaj khov thiab tsim hauv pwm kab noj hniav.

3. Lub muab tub lim occupies ntau tshaj ib feem peb ntawm daim ntawv molding compound thiab tuaj yeem kho cov viscosity ntawm molding compound.Nws feem ntau yuav tsum muaj cov yam ntxwv ntawm lub ntiajteb txawj nqus uas tsis tshua muaj siab, tsis tshua muaj roj adsorption tus nqi, tsawg pores, corrosion kuj, thiab tus nqi qis.Cov khoom siv feem ntau siv yog CaCO3, Al (OH) 3, thiab lwm yam.

4. Thickeners muab SMC cov khoom muaj viscosity, tsis nplaum.Kev npaj ntawm daim ntawv thiab ntau molding tebchaw yuav tsum muaj tsawg viscosity ntawm cov resin los pab txhawb lub impregnation ntawm iav fiber thiab muab tub lim los ntawm cov resin.Thiab compression molding yuav tsum muaj viscosity ntau dua.Yog li ntawd, nws yog ib qho tsim nyog yuav tau ntxiv cov thickener ua ntej txheej txheem molding los hloov cov viscosity tsawg ntawm iav fiber impregnation rau hauv siab viscosity uas tsis nplaum.

5. Tus neeg sawv cev tso tawm tiv thaiv cov ntawv molding compound kom tsis txhob muaj kev sib raug zoo nrog cov hlau pwm nto.Tus neeg sawv cev tso tawm tuaj yeem tiv thaiv cov khoom tsis zoo polyester los ntawm kev cuam tshuam nrog lub npoo ntawm cov pwm hlau thaum lub sij hawm cov txheej txheem yas ntawm cov resin sib tov.Feem ntau ntev-chain fatty acids los yog ntsev sawv cev los ntawm zinc stearate.Kev siv ntau dhau yuav yooj yim txo qhov kev ua haujlwm ntawm cov khoom.Kev siv dav dav suav rau 1 ~ 3% ntawm tag nrho cov khoom lag luam kom ntseeg tau tias cov khoom lag luam zoo.

6. Cov iav fibers tuaj yeem txhim kho qhov kev tiv thaiv corrosion thiab rwb thaiv tsev ntawm SMC.Sheet molding compound feem ntau xaiv cov iav fiber ntau mats ua cov khoom siv ntxiv.Kev siv ntau dhau yuav yooj yim ua rau cov khoom lag luam fluffy, thiab kev siv tshuaj me me dhau lawm yuav tsis muaj qhov pom tseeb ntxiv dag zog rau cov khoom.Kev siv dav dav yog li 20%.Nyob rau hauv txoj kev no, cov khoom tuaj yeem ua tau raws li ob txoj hauv kev ntawm extrusion molding thiab compression molding.

7. Inhibitor ua rau kom muaj kev ruaj ntseg ntawm SMC thiab ncua lub sijhawm cia.Txij li thaum tus thawj styrene yuav decompose maj mam, ua rau lub polymerization ntawm cov resin, ntxiv ib tug tsim nyog tus nqi ntawm dawb radical scavenger (polymerization inhibitor) yuav ua rau kom ceev ntawm styrene decomposition thiab ncua nws lub sij hawm cia.Inhibitors feem ntau yog benzoquinones thiab polyvalent phenolic tebchaw.

Daim Ntawv Thov Moulding Compound Khoom

SMC muaj qhov zoo ntawm kev ua tau zoo ntawm cov hluav taws xob zoo, muaj zog corrosion kuj, lub teeb yuag, yooj yim thiab hloov tau yooj yim engineering tsim, thiab lwm yam. Nws cov khoom siv tshuab yog piv rau qee cov ntaub ntawv hlau.Yog li ntawd, nws yog dav siv nyob rau hauv yim teb xws li kev lag luam tsheb, tsheb ciav hlau, kev tsim kho, khoom siv hluav taws xob, thiab kev sib txuas lus (Table 1).

Ntawm lawv, nyob rau hauv thaum ntxov theem, nws yog tsuas yog siv nyob rau hauv daim ntawv ntawm insulating boards nyob rau hauv lub teb ntawm kev tsim kho, cov khoom siv hluav taws xob, thiab kev sib txuas lus, thiab cov cuab yeej siv tau zoo heev.Tom qab ntawd nws tau siv rau hauv kev lag luam tsheb los hloov ib feem ntawm cov hlau thiab aluminium alloy cov ntaub ntawv ntawm lub cev kom txo qhov hnyav ntawm lub tsheb.

Raws li keeb kwm yav dhau los ntawm kev txuag hluav taws xob tam sim no thiab txo qis emissions thiab kev txhim kho cov tsheb tshiab lub zog, cov cuab yeej siv hluav taws xob ntawm cov khoom siv tsheb txuas ntxiv txhim kho rau lub teeb yuag thiab zoo.Txog tam sim no, daim ntawv thov ntawm SMC cov ntaub ntawv tuaj yeem pom nyob txhua qhov chaw hauv lub neej txhua hnub.Nws muaj kev cuam tshuam hauv kev sib txuas lus wireless, tawg-pov thawj hluav taws xob enclosures, cov ntaub ntawv rwb thaiv tsev hauv av, chav dej, thiab cov chaw tsheb ciav hlau ceev.

Table 1 Yim loj daim ntawv thov thiab subdivision teb ntawm SMC cov ntaub ntawv

Cov ntsiab lus

Lub unsaturated polyester resin, crosslinking tus neeg sawv cev, pib, thiab muab tso rau hauv daim ntawv molding compound muab cov khoom siv rau cov khoom thiab ua kom lub zog ntawm cov qauv.Thickener, tso tawm tus neeg sawv cev, iav fiber ntau, thiab polymerization inhibitor ntxiv viscosity, corrosion resistance, rwb thaiv tsev, thiab cov qauv ruaj khov rau cov khoom.Cov khoom lag luam zoo li no tau siv rau hauv yim qhov loj xws li kev lag luam tsheb thiab tsheb ciav hlau.Raws li keeb kwm tam sim no ntawm kev txuag hluav taws xob, kev tiv thaiv ib puag ncig, thiab kev siv hluav taws xob tsawg, kev lag luam tsheb tau muab cov kev xav tau ntau dua thiab siab dua rau SMC cov ntaub ntawv vim lawv cov kev xav tau hnyav.Uas yog lub luag haujlwm tseem ceeb rau kev txhim kho SMC thev naus laus zis.

Siv covcomposite hydraulic xovxwm tshuabmus nias ntawv molding compound khoom.Zhengxi yog tus kws tshaj lijhydraulic xovxwm Hoobkas nyob rau hauv Suav teb, muab cov xovxwm zoo.Tiv tauj peb kom tau txais cov ntsiab lus.