Dab tsi yog qhovorganosiliconecompounds?
Organic silicone compounds yog cov uas muaj Si-C daim ntawv cog lus thiab tsawg kawg ib qho organic hloov pauv ncaj qha mus rau silicon atom, xws li CH₃SiH₃, CIH₂CSiCI₃, C ₆ H ₅ SiCl ₃, C₂ H ₅ Si (OMe) ₃, ₃ SiOSi (CH ₃) ₃, [(CH ₃) ₂SiO] ₄ thiab lwm yam yog cov organic silicon compounds. Raws li, SiH₄, SiC, Na₂SiO₃ thiab H₃SiCN ₄ belongs rau inorganic silicone compounds. Hauv Suav teb, nws yog kev cai hu ua silicone monomer thiab polysiloxane li "silicone compound" lossis "silicone", thiab polysiloxane resin li silicone resin, polysiloxane kua li silicone roj, polysiloxane roj hmab li silicone roj hmab.
Dab tsi yog cov kua roj hmab silicone?
Cov kua roj hmab silicone yog ua los ntawm cov qes qis qis linear silicone polymer li lub hauv paus kua nplaum, thiab hla tus neeg sawv cev txuas, catalyst, muab tub lim thiab lwm yam khoom ntxiv. Raws li nws cov vulcanization mechanism muab faib ua condensation hom thiab ntxiv hom, raws li vulcanization kub yog muab faib ua high kub vulcanization (HTV) thiab chav kub vulcanization (RTV), raws li kev siv thiab ntim daim ntawv muab faib ua ib feem thiab ob lub Cheebtsam. .
Dab tsi yog qhov ntxiv hom kua silicone roj hmab?
Ntxiv hom kua silicone roj hmab yog ib qho tseem ceeb ntawm kev txhim kho thiab kev siv ntawm Speier hydrosilication hauv silicone roj hmab vulcanization. Lub hauv paus ntsiab lus yog siloxane uas muaj vinyl thiab ntau-Si-H daim ntawv cog lus siloxane yog catalyzed los ntawm yim pawg hloov pauv hlau sib txuas (xws li Pt, thiab lwm yam) rau hydrosilylation ntxiv cov tshuaj tiv thaiv los tsim ib daim ntawv cog lus tshiab Si-C, kom cov kab siloxane. yog cross-linked rau hauv lub network qauv. Cov kev sib npaug sib npaug raws li hauv qab no:
Hydrosilication cov tshuaj tiv thaiv theoretically tsis tsim los ntawm cov khoom lag luam, thiab muaj cov yam ntxwv ntawm kev hloov pauv siab, tswj tau qhov sib txuas sib txuas ceev thiab ceev, li no silicone roj hmab muaj kev ua tau zoo dua.
Condensation Liquid Silicone Rubber VS Ntxiv Liquid Silicone Rubber
Feature | Condensation | Ntxiv |
Ua ntej vulcanization | Tsawg viscosity (700mm² / s), putty puabe | Tsawg viscosity (500mm²/s), putty puabe |
Sib tov piv (Base polymer: cross linker) | (100:0.5)~(100:10) | (100:3)~(100:100) |
Kev siv tau | Nyob ntawm tus nqi ntawm cov catalyst, feem ntau luv luv | Ntev ntev thiab tswj tau yooj yim |
Vulcanization ceev | Nyob ntawm tus nqi ntawm cov catalyst, cov av noo muaj qhov cuam tshuam loj, qhov kub thiab txias muaj qhov cuam tshuam me me | Cov av noo muaj txiaj ntsig zoo, thiab tuaj yeem ua vulcanized sai ntawm qhov kub thiab txias, tab sis cov av noo tsis muaj qhov cuam tshuam |
Sib sib zog nqus vulcanization | Qee cov khoom tsis ua haujlwmk | Txhua yam khooms |
By-products | Cawv, dej, hydrogen | Tsis muaj |
Catalyst lom | Tsis muaj | Tsis txhob tiv tauj nrog N, P, S organic compounds, Sn, Pb, Hg, Bi, Raws li ionic chemicals, acetylene thiab polyvinyl tshuaj |
Ehluav taws xob rwb thaiv tsev | Lub vulcanization pib txo qis, ces rov qab mus rau qhov qub | Tsis muaj teebmeem |
Kab shrinkage/ feem pua | <> | <> |
Tsawg hauv kaw qhov system | zoo | |
Mechanical zog Stripping kev sib deev adhesion Kub thiab dej tsis kam Nplaim retardant |
kev ua tau zoo tuaj yeem txhim kho los ntawm kev kho cov qauv |
kev ua tau zoo tuaj yeem txhim kho los ntawm kev kho cov qauv |
Ib qho kev tivthaiv & ob chav tivthaiv ua kua silicone roj hmab
Ntxiv hom kua silicone roj hmab, feem ntau yog tsim los ntawm lub hauv paus polymer, cross linker, catalyst, muab tub lim thiab lwm yam additives. Raws li txoj kev ntim khoom, muab faib ua ob pawg: ib qho khoom siv thiab ob qho tib si. Cov qub yog sib xyaw cov khoom saum toj no nrog cov inhibitors lossis cov tshuaj ntsiav-hom platinum catalyst khaws cia ntawm qhov kub thiab txias. Thaum siv, los ntawm kev nce qhov kub thiab txias, qhov kev ua haujlwm catalyst tuaj yeem rov qab los, tom qab ntxiv cov tshuaj tiv thaiv ces tig mus rau hauv elastomer.Lub tom kawg yog ua ke rau hauv ob pob khoom raws li cov khoom siv tshuaj. Thaum siv, tom qab sib tov nyob rau hauv ib qho kev faib ua feem los yog cua sov me ntsis, tom qab ntxiv cov tshuaj tiv thaiv ces hla mus rau hauv elastomer.
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