Ib. Lub hauv paus ntsiab lus ua haujlwm ntawm vinyl - txiav cov roj silicone hauv thermal conductive potting nplaum
Vinyl-tawm silicone roj yog lub hauv paus polymer ntawm silicone thermal conductive potting compound. Ob qhov kawg ntawm nws cov saw hlau molecular muaj vinyl functional pawg (-CH=CH₂). Cov qauv tshwj xeeb no txiav txim siab qhov tseem ceeb ntawm kev ua haujlwm ntawm potting compound.
1. Hla -txuas Kev Sib Tham Txoj Cai
Vinyl- txiav tawm silicone roj hla- txuas nrog hydrogen- muaj cov roj silicone los ntawm cov tshuaj tiv thaiv hydrosilylation:
Reaction formula:
Vi-PDMS-Vi + H-PDMS-H → Peb-dimensional cross-linked network (Vi: vinyl pawg, PDMS: polydimethylsiloxane, H: hydrogen pawg)
Nyob rau hauv qhov kev txiav txim ntawm platinum catalyst, vinyl reacts nrog silicon -hydrogen bonds los tsim Si-C bonds ruaj khov thiab tsim ib qho peb - qhov loj me network qauv, uas yog lub hauv paus tshuaj rau kev kho ntawm potting compound.
2. Lub hauv paus ntsiab lus ntawm Kev Tiv Thaiv Kub
Si-C daim ntawv cog lus thiab Si-O-Si txha caj qaum tsim los ntawm vinyl- cov roj silicone tau txiav tawm muaj cov txiaj ntsig siab heev:
Si-O daim ntawv cog lus zog: 451 kJ/mol, siab dua C-C daim ntawv cog lus (347 kJ/mol).
Si-C daim ntawv cog lus zog: 318 kJ/mol, ua rau muaj kev ruaj ntseg zoo heev.
Cov saw yooj yooj yim molecular thiab qis thermal expansion coefficient kom ruaj khov ua haujlwm dhau qhov kub ntawm -50℃txog 250 degree.
3. Ua kom tau txais cov thermal conductivity
Vinyl- txiav cov roj silicone nws tus kheej muaj cov thermal conductivity tsis zoo, tab sis nws tuaj yeem ua "cov pob txha molecular" los txhawb cov feem ntau ntawm thermally conductive fillers.
Cov ntsiab lus tseem ceeb: Vinyl- txiav cov roj silicone muaj kev sib raug zoo nrog cov thermally conductive fillers (xws li alumina thiab boron nitride), ua kom muaj kev sib xyaw ua ke nrog qis interfacial thermal tsis kam, ua tiav cov cua sov kom zoo.
Los ntawm kev ua kom zoo dua cov ntsiab lus vinyl thiab qhov hnyav molecular faib, lub peev xwm muab tub lim tuaj yeem nce ntxiv, ua kom muaj kev sib txuas txuas ntxiv thermally conductive.
OB. Viscosity Selection Guide rau Di-Terminated Vinyl Silicone Oil
Lub viscosity ntawm vinyl- tshem tawm cov roj silicone ncaj qha cuam tshuam rau kev tsim kho kev ua haujlwm thiab kev ua haujlwm kawg ntawm cov potting compound, yog li xaiv qhov tsim nyog viscosity yog qhov tseem ceeb.
| Viscosity Range (mPa · s) | Nta | Daim ntawv thov | Cov kev ceev faj |
| 100-1,000 | Zoo heev fluidity thiab muaj zog permeability | Cov khoom siv hluav taws xob me me, nqaim qhov sib txawv | Filler yooj yim rau kev daws teeb meem, yuav tsum tau tswj lub sijhawm kho |
| 1,000-5,000 | Zoo fluidity thiab yooj yim tuav | General electronic modules, sensor ntim | Balanced fluidity thiab los tiv thaiv - cov khoom daws teeb meem |
| 5,000-20,000 | Nruab nrab viscosity, muaj ntau yam | Fais fab modules, automotive electronics | Haum rau feem ntau potting daim ntaub ntawv |
| 20,000-50,000 | High viscosity, zoo heev sag kuj | Vertical potting, ib nrab filling | Tej zaum yuav xav tau cov cuab yeej tshwj xeeb potting |
| 50,000 thiab siab dua |
Muab tshuaj txhuam -zoo li, zoo heev khaws cia | Thermal gasket hloov, dispensing daim ntaub ntawv | Fluidity tsis zoo, tsis haum rau cov txheej txheem nyuaj |
Cov kev xaiv tseem ceeb rau vinyl -tawm cov roj silicone
1. Vinyl cov ntsiab lus cuam tshuam rau crosslink ceev thiab kho hardness. Cov ntsiab lus vinyl siab muab qhov sib txuas ntau dua tab sis tuaj yeem ua rau cov khoom tawg.
2. Ib qho nqaim molecular hnyav faib muab cov khoom zoo sib xws, thaum kev faib dav tuaj yeem txhim kho kev ua haujlwm tab sis cuam tshuam rau kev ua haujlwm ruaj khov.
3. Cov ntsiab lus tsis tshua muaj hluav taws xob txo qis kev kho mob shrinkage thiab cua npuas, txhim kho cov khoom ntseeg tau.
4. Purity thiab Impurities: High- cov khoom siv purity ua kom tiav kev kho mob, tsis txhob muaj cov tshuaj lom catalyst thiab kev ua haujlwm tsis zoo.
Peb. Daim ntawv thov scenarios thiab xaiv cov lus pom zoo
1. Siab-Cov Khoom Siv Hluav Taws Xob Hluav Taws Xob
Cov ntawv thov: Siab- lub zog LEDs, lub zog hluav taws xob, thiab lub zog tshiab tsheb hluav taws xob tswj cov tshuab
Kev pom zoo xaiv: Xaiv cov khoom uas muaj qhov nruab nrab viscosity (5,000-20,000 mPa·s) thiab cov ntsiab lus vinyl nruab nrab kom ntseeg tau tias thermal conductivity zoo thiab ntws.
2. Precision Electronic Cheebtsam
Daim ntawv thov: Sensors, microelectronic modules, precision circuits
Kev pom zoo xaiv: Xaiv cov khoom uas muaj viscosity tsawg (1,000-5,000 mPa·s) thiab tsis tshua muaj volatility los xyuas kom meej nkag mus thiab tsis muaj kev ntxhov siab encapsulation.
3. Siab -Tsub siv
Daim ntaub ntawv: Cav controllers, industrial cua sov khoom
Kev pom zoo xaiv: Xaiv cov khoom uas muaj cov ntsiab lus vinyl siab thiab siab molecular hnyav los txhim kho crosslink ceev thiab thermal stability.
4. Kev siv ceev ceev
Cov ntawv thov: Cov khoom siv hluav taws xob, siab - cov khoom ntim ntau lawm
Kev Pom Zoo Kev Xaiv: Xaiv cov khoom uas muaj qhov cuam tshuam nruab nrab thiab lub sijhawm ua haujlwm ntev kom sib npaug ntawm kev tsim khoom thiab kho ceev.
