oom kub vulcanized phenylene silicone roj hmab yog silicobenzene (biphenyl) siloxane polymer. Nws qhov txiaj ntsig zoo tshaj yog tias muaj kev tiv thaiv zoo rau lub zog hluav taws xob. Kev ntsuam xyuas tau ua pov thawj tias tom qab tau xoo hluav taws xob los ntawm 1x109 Roentgen γ-rays lossis 1x1018 neutrons/cm2 neutrons, roj hmab elasticity tseem tuaj yeem tswj tau, uas yog 10-15 npaug loj dua chav sov vulcanized methyl silicone roj hmab, thiab 5 ~ loj dua chav sov vulcanized phenyl silicone roj hmab. 10 zaug.
Chav sov vulcanized phenylene silicone roj hmab tuaj yeem siv rau hauv kev lag luam hluav taws xob nuclear, cov chaw tsim hluav taws xob nuclear thiab chaw dav hlau raws li qhov kub thiab hluav taws xob tiv taus nplaum cov khoom sib khi thiab hluav taws xob tiv thaiv txheej txheej.
Chav sov vulcanized silicone roj hmab (RTV) yog hom tshiab ntawm silicone elastomer uas tau tawm hauv xyoo 1960. Qhov tseem ceeb tshaj plaws ntawm cov roj hmab no yog tias nws tuaj yeem kho nyob rau hauv qhov chaw tsis muaj cua sov lossis nias ntawm chav sov, thiab nws yooj yim heev rau siv. Yog li ntawd, sai li sai tau nws tawm los, nws tau dhau los ua ib qho tseem ceeb ntawm tag nrho cov khoom siv silicone. Tam sim no chav tsev kub vulcanized silicone roj hmab tau siv dav ua cov nplaum, cov nplaum, tiv thaiv txheej, tshuaj pleev thiab khoom siv, thiab muaj nws siv hauv txhua txoj kev ntawm lub neej.
Chav kub vulcanized silicone roj hmab yog hu ua kua silicone roj hmab vim nws qhov hnyav tsis hnyav. Nws lub cev feem ntau yog cov dej ntws los yog cov kua nplaum, thiab nws cov viscosity nyob nruab nrab ntawm 100 txog 1,000,000 centistokes. Raws li qhov xav tau ntawm kev siv, cov roj hmab sib xyaw ua ntej vulcanization tuaj yeem ua rau tus kheej ua kom sib xyaw ua ke los yog cov dej sib tov uas tsis ntws tab sis tuaj yeem siv tau. Cov muab tub lim siv hauv chav sov vulcanized silicone roj hmab zoo ib yam li qhov kub thiab txias vulcanized silicone roj hmab, thiab nws tau txhawb ntxiv nrog cov pa roj carbon dub, kom cov roj hmab vulcanized muaj lub zog tensile ntawm 10-60 kg/cm2. Ntxiv cov additives sib txawv tuaj yeem ua rau cov roj hmab sib xyaw nrog qhov sib txawv tshwj xeeb nqus, tawv, lub zog, kua thiab thixotropy, thiab ua cov roj hmab vulcanized nrog ntau yam tshwj xeeb xws li nplaim hluav taws, hluav taws xob ua hluav taws xob, thermal conductivity, thiab ablation tsis kam.
Chav kub vulcanized silicone roj hmab tuaj yeem muab faib ua ib leeg thiab ob chav tiv thaiv chav kub vulcanized silicone roj hmab raws li nws txoj kev ntim khoom thiab tuaj yeem faib ua hom hws thiab ntxiv moulding raws li cov txheej txheem vulcanization. Yog li, chav tsev kub vulcanization silicone roj hmab tuaj yeem faib ua peb hom raws li kev sib xyaw, txheej txheem txheej txheem vulcanization thiab siv txheej txheem, uas yog, ib ntu tiv thaiv chav tsev kub vulcanization silicone roj hmab, ob-tivthaiv ua kom txias hom chav kub vulcanization silicone roj hmab thiab ob-tivthaiv ntxiv hom chav kub vulcanization silicone roj hmab.
Cov roj hmab nyoos nyoos ntawm ib qho kev tivthaiv thiab ob qhov sib xyaw ua ke RTV silicone rubbers yog txhua yam α, ω-dihydroxy polysiloxanes; ntxiv-RTV silicone rubbers muaj cov pab pawg alkenyl thiab pab pawg hydrogen (lossis pab pawg kawg) Polysiloxane, vim tias nws tuaj yeem tau txais kev kho kom zoo ntawm qhov kub me ntsis siab dua chav sov (50～150℃) thaum nws kho tau, nws kuj tseem hu ua qis kub vulcanized silicone roj hmab (LTV).
Cov peb ntu ntawm chav tsev kub vulcanization silicone rubbers muaj lawv tus kheej qhov zoo thiab qhov tsis zoo: qhov zoo ntawm ib-ntu tiv thaiv chav kub vulcanization silicone roj hmab yog qhov nws yooj yim siv, tab sis kev sib sib zog nqus ua kom nrawm dua yog qhov nyuaj; qhov zoo ntawm ob-tivthaiv chav ntsuas kub vulcanization silicone roj hmab yog tias nws tsis tso cua sov thaum kho, Tus nqi qis me me, tsis nthuav dav, tsis muaj kev ntxhov siab sab hauv, kho tuaj yeem nqa tawm tib lub sijhawm sab hauv thiab saum npoo, thiab tuaj yeem ua rau vulcanization sib sib zog nqus; lub sij hawm vulcanization ntawm qhov sib ntxiv hauv chav tsev kub vulcanized silicone roj hmab feem ntau yog txiav txim siab los ntawm qhov kub thiab txias, yog li cov vulcanization tuaj yeem tswj tau los ntawm kev kho qhov kub thiab txias. Ib-tivthaiv chav kub vulcanized silicone roj hmab&& quot; Cov tshuaj tiv thaiv vulcanization ntawm ib puag ncig chav tsev kub vulcanized silicone roj hmab yog pib los ntawm ya raws hauv huab cua. Feem ntau siv tus ntoo khaub lig-txuas tus neeg sawv cev yog methyl triacetoxy silane. Nws Si-OC daim ntawv cog lus tau yooj yim hydrolyzed. Cov pab pawg acetoxy ua ke nrog cov pab pawg hydrogen hauv cov dej los tsim cov kua qaub, thiab pab pawg hydroxyl hauv cov dej tau hloov mus rau pawg qub acetoxy. Hauv txoj haujlwm, nws dhau los ua trihydroxymethylsilane. Trihydroxymethylsilane tsis ruaj tsis khov thiab yooj yim ua ke nrog cov kab silicones uas nws cov pawg kawg yog cov pab pawg hydroxyl los tsim cov qauv sib txuas. Feem ntau, cov roj hmab silicone nyoos uas muaj silanol kawg pab pawg thiab muab tub lim,
Ntau tus neeg sawv cev sib xyaw xws li catalysts thiab cov tshuaj sib txuas sib txuas tau ntim rau hauv lub qhov dej kaw thiab nyem tawm ntawm lub thawv thaum siv. Lawv tau vulcanized rau hauv elastomers nrog kev pab ntawm cov dej noo hauv huab cua, thiab cov tshuaj qis-molecular raug tso tawm tib lub sijhawm.
Ntxiv rau methyltriacetoxysilane, tus neeg saib xyuas kev sib txuas kuj tseem tuaj yeem yog silane uas muaj alkoxy, oxime, amine, amide, thiab keto pawg. Thaum nws tau txuas nrog cov pab pawg alkoxy, nws tso dej cawv, uas yog hu ua kev haus cawv yam ib feem tiv thaiv chav tsev kub vulcanized silicone roj hmab. Thaum nws tau sib txuas nrog cov pab pawg oxime, oxime tau tsim Nyob ntawm tus neeg sawv cev, ib leeg tivthaiv hauv chav sov vulcanized silicone roj hmab tuaj yeem deacidified, deoximated, deal cawv, deamined, deamidated, thiab deketone, tab sis hom deacidified yog siv ntau tshaj plaws ib. zoo.
Lub sij hawm vulcanization ntawm ib puag ncig chav tsev kub vulcanized silicone roj hmab nyob ntawm qhov txheej txheem vulcanization, kub, av noo, thiab tuab ntawm txheej txheej roj hmab silicone. Ua kom qhov kub thiab txias nyob ib puag ncig tuaj yeem ua rau txheej txheem vulcanization. Nyob rau ib puag ncig ib puag ncig ib puag ncig, feem ntau tom qab 15 txog 30 feeb, cov nplaim ntawm cov roj hmab silicone yuav tsis nplaum, thiab txheej nplaum nrog tuab ntawm 0.3 cm tuaj yeem kho tau hauv ib hnub. Qhov tob thiab lub zog ntawm kev kho yuav maj mam nce ntxiv hauv li peb lub lis piam.
Ib-tivthaiv kub hauv chav vulcanized silicone roj hmab muaj cov khoom siv hluav taws xob zoo thiab tsis muaj tshuaj lom, nrog rau kev tiv tshav kub, tiv taus kev laus, ntuj nplaim taws, tiv taus dej, thiab huab cua permeability. Lawv tuaj yeem tswj tau qhov kev ywj pheej mus sij hawm ntev hauv thaj tsam ntawm -60～200℃. Nws tsis nqus lossis tso cua sov thaum lub sij hawm tua, muaj tus nqi me me tom qab kho, thiab muaj cov nplaum zoo rau cov khoom siv. Yog li ntawd, nws yog siv los ua cov nplaum thiab cov nplaum. Lwm daim ntawv thov suav nrog cov khoom siv hauv qhov chaw, txheej txheej tiv thaiv, thiab cov ntaub nplaum. Ntau qhov kev tsim ntawm ib qho tivthaiv silicone roj hmab nplaum ua rau pom cov khoom sib txuas tsis zoo rau ntau yam khoom siv xws li hlau, iav, ceramics, thiab pob zeb ua ke. Piv txwv li, lub zog txiav ntawm cov txhuas tuaj yeem ncav cuag 200 lbs/in2. Lub zog tsim kua muag tuaj yeem ncav cuag 20 lb · ft/in2 (0.35 joules/cm2). Thaum kev sib txuas yog qhov nyuaj, cov txheej txheem tuaj yeem siv rau hauv txheej txheej txhawm rau txhim kho kev sib zog ua kom muaj zog. Cov primer tuaj yeem yog reactive silane monomer lossis cob. Thaum lawv tau kho ntawm lub substrate, txheej txheej hloov kho kom haum rau saum npoo ntawm silicone tsevneeg.
Txawm hais tias ib leeg-tivthaiv chav sov vulcanized silicone roj hmab yog siv tau yooj yim, nws cov vulcanization yog nyob ntawm qhov noo noo hauv huab cua, yog li cov tuab ntawm cov roj hmab vulcanized raug txwv, thiab nws tsuas yog siv tau rau qee lub sijhawm qhov tuab yog tsawg dua 6 hli.
Cov tshuaj tiv thaiv vulcanization ntawm ib feem tiv thaiv hauv chav tsev kub vulcanized silicone roj hmab tau maj mam nqa tawm ntawm qhov chaw mus rau qhov tob. Cov txheej roj hmab tuab dua, ua kom qeeb dua. Thaum qhov sib sib zog nqus xav tau kho sai, txheej txheej nchuav thiab siv cov txheej txheem vulcanization tuaj yeem siv tau, thiab qee cov khoom siv roj hmab tuaj yeem ntxiv txhua lub sijhawm, thiab tom qab ntawd cov khoom tuaj yeem raug ntxiv tom qab vulcanization, uas tuaj yeem txo tag nrho lub sij hawm vulcanization. Ntxiv magnesium oxide tuaj yeem ua kom nrawm nrawm ntawm cov kua nplaum sib sib zog nqus.
Kub tiv taus silicone roj hmab kub tsis kam -70℃-+350℃, siab thiab qis kub tsis kam. Methyl phenyl vinyl silicone roj hmab yog qhia txog methyl phenyl silicone saw txuas lossis diphenyl rau hauv cov saw molecular ntawm methyl vinyl silicone roj hmab Cov khoom lag luam muab los ntawm cov roj hmab-oxygen txuas txuas.
Kev qhia txog cov pab pawg phenyl nyob rau sab pab pawg ntawm polysiloxane rhuav tshem qhov tsis tu ncua ntawm cov qauv dimethylsiloxane, txo qis qhov ua kom sov sov ntawm cov polymer, thiab nthuav tawm qhov kub qis thov ntau ntawm cov khoom siv polymer. Yog li ntawd, methyl phenyl vinyl silicone roj hmab muaj txhua tus yam ntxwv ntawm methyl vinyl silicone roj hmab, xws li kev teeb tsa me me, siv dav ntau qhov kub thiab txias, tiv taus oxidation, tiv taus huab cua, tiv taus poob siab, tiv taus ya raws thiab hluav taws xob zoo zog. Cov khoom ntawm qhov kub tsis kam tiv taus, tshem tawm tsis kam thiab tiv taus hluav taws xob. Cov khoom no sib txawv nrog cov ntsiab lus ntawm phenyl hauv cov saw hlau. Kev hais lus dav dav, cov ntsiab lus ntawm phenyl (piv ntawm phenyl rau silicon atoms) yog nruab nrab ntawm 5 txog 10 % Yog hu ua qis phenyl silicone roj hmab. Nws muaj qhov tshwj xeeb txias tsis kam. Nws tseem tuaj yeem tswj hwm qhov elasticity ntawm roj hmab ntawm -70～-100℃. Nws yog qhov ntsuas kub zoo tshaj plaws ntawm txhua lub rubbers. Ib qho ntxiv, nws kuj muaj methyl vinyl. Roj hmab roj hmab muaj qhov zoo thiab raug nqi tsawg, yog li nws zoo li hloov cov roj hmab roj hmab methyl vinyl. Thaum cov ntsiab lus phenyl yog 20-40%, nws yog hu ua nruab nrab phenyl silicone roj hmab. Nws muaj cov nplaim hluav taws zoo thiab tuaj yeem tua tus kheej thaum nws tua hluav taws. Thaum cov ntsiab lus phenyl yog 40-50%, nws tau hu ua siab phenyl silicone roj hmab. Nws muaj hluav taws xob tiv taus zoo heev thiab tiv thaiv hluav taws xob tiv thaiv yog 1xI08 roentgen. Kev hais lus dav dav, raws li cov ntsiab lus phenyl nce ntxiv, qhov nruj ntawm cov roj hmab silicone roj hmab molecular saw maj mam nce, thiab qhov kub tsis kam tiv taus ntawm silicone roj hmab maj mam txo qis. Txawm li cas los xij, raws li cov ntsiab lus phenyl nce ntxiv, nplaim taws tsis kam thiab hluav taws xob tiv thaiv ntawm vulcanizate tau zoo dua.
Methylphenyl vinyl silicone roj hmab yog ib qho ntawm cov ntaub ntawv tseem ceeb hauv kev lag luam aerospace, kev siv tshuab thev naus laus zis, thiab lwm yam haujlwm hauv kev lag luam hauv tebchaws. Nws tuaj yeem siv los ua ntau yam khoom lag luam pwm thiab extruded raws li txias-resistant roj hmab hauv kev lag luam dav hlau thiab rau kev tshem tawm tsis kam. Sealing rings, gaskets, kav dej thiab kab rau cov cua sov-laus lossis cov khoom tiv taus hluav taws xob.