Cov khoom siv foob silicone ob txheej muaj zog heev, muaj peev xwm dais tau cov khoom hnyav, thiab tiv taus kev laus, qaug zog, thiab xeb, thiab muaj kev ua haujlwm ruaj khov hauv lub neej ntev. Lawv tsim nyog rau cov nplaum uas tiv taus kev sib txuas ntawm cov khoom siv. Nws feem ntau yog siv rau kev sib txuas hlau, ceramics, plastics, roj hmab, ntoo thiab lwm yam khoom siv tib yam lossis ntawm ntau hom khoom siv, thiab tuaj yeem hloov qee qhov kev sib txuas ib txwm muaj xws li vuam, riveting thiab bolting.
Cov tshuaj nplaum silicone yog ib yam khoom tseem ceeb uas siv rau hauv cov phab ntsa iav uas zais tag nrho lossis ib nrab zais. Los ntawm kev txuas cov phaj thiab cov thav ntawv hlau, nws tuaj yeem tiv taus cua thiab qhov hnyav ntawm iav, uas muaj feem cuam tshuam ncaj qha rau kev ruaj khov thiab kev nyab xeeb ntawm kev tsim cov qauv phab ntsa iav. Ib qho ntawm cov kev sib txuas tseem ceeb ntawm kev nyab xeeb ntawm cov phab ntsa iav.
Nws yog ib qho khoom siv foob uas muaj cov polysiloxane linear ua cov khoom siv tseem ceeb. Thaum lub sijhawm kho, tus neeg sawv cev crosslinking reacts nrog lub hauv paus polymer los tsim cov khoom siv elastic nrog cov qauv network peb-seem. Vim tias lub zog Si-O bond hauv cov qauv molecular ntawm silicone roj hmab yog qhov loj heev hauv cov tshuaj sib txuas (Si-O tshwj xeeb lub cev thiab tshuaj zog: bond ntev 0.164 ± 0.003nm, thermal dissociation zog 460.5J / mol. Siab dua C-O358J / mol, C-C304J / mol, Si-C318.2J / mol), piv nrog lwm cov sealants (xws li polyurethane, acrylic, polysulfide sealant, thiab lwm yam), UV tsis kam thiab tiv taus Lub peev xwm laus hauv huab cua muaj zog, thiab nws tuaj yeem tswj tsis muaj kab nrib pleb thiab puas tsuaj rau 30 xyoo hauv ntau qhov chaw huab cua. Nws muaj ± 50% tiv taus kev hloov pauv thiab kev hloov chaw hauv ntau qhov kub thiab txias. Txawm li cas los xij, nrog rau kev nce ntxiv ntawm kev siv cov khoom siv silicone sealant, ntau yam teeb meem yuav tshwm sim hauv kev siv tiag tiag, xws li: cov khoom me me sib sau ua ke thiab pulverization ntawm cov khoom B, kev sib cais thiab stratification ntawm cov khoom B, compression Lub phaj tsis tuaj yeem nias lossis cov kua nplaum tig mus, qhov ceev ntawm cov kua nplaum ntawm lub tshuab kua nplaum qeeb, cov kua nplaum ntawm daim ntawv npauj npaim muaj cov khoom me me, lub sijhawm ziab ntawm qhov chaw ceev dhau lossis qeeb dhau, cov kua nplaum zoo li tawv nqaij lossis vulcanization, thiab "paj kua nplaum" tshwm sim thaum lub sijhawm ua kua nplaum. ", cov colloid tsis tuaj yeem kho tau ib txwm, tes nplaum tom qab ob peb hnub ntawm kev kho, qhov nyuaj tsis zoo tom qab kho, muaj cov qhov zoo li koob ntawm qhov chaw sib txuas nrog lub substrate, cov pa npuas raug ntes hauv cov silicone sealant, kev sib txuas tsis zoo nrog lub substrate, tsis sib xws nrog cov khoom siv, thiab lwm yam.
2. Kev tshuaj xyuas cov lus nug ntawm Ob Lub Cheebtsam Cov Khoom Siv silicone nplaum
2.1 B ib feem muaj cov khoom me me sib sau ua ke thiab ua kom sib xyaw ua ke
Yog tias cov khoom me me sib sau ua ke thiab sib tsoo ntawm cov khoom B tshwm sim, muaj ob qho laj thawj: ib qho yog tias qhov xwm txheej no tau tshwm sim hauv txheej sab saud ua ntej siv, uas yog vim qhov kev sib khi tsis zoo ntawm lub pob, thiab tus neeg sawv cev sib txuas lossis tus neeg sawv cev sib txuas hauv cov khoom B yog cov khoom siv nquag, yooj yim rau cov dej noo hauv huab cua, cov khoom no yuav tsum xa rov qab rau tus neeg tsim khoom. Qhov thib ob yog tias lub tshuab raug kaw thaum lub sijhawm siv, thiab cov khoom me me sib sau ua ke thiab sib tsoo tshwm sim thaum lub tshuab tig rov qab, qhia tias lub foob ntawm lub phaj siab ntawm lub tshuab kua nplaum thiab cov khoom siv roj hmab tsis zoo, thiab cov khoom siv yuav tsum tau tiv tauj los daws qhov teeb meem.
2.2 Qhov ceev ntawm lub tshuab nplaum qeeb
Thaum siv cov khoom thawj zaug, qhov ceev ntawm cov kua nplaum ntawm lub tshuab nplaum qeeb dhau thaum lub sijhawm nplaum. Muaj peb qhov laj thawj: ⑴ Cheebtsam A muaj cov kua dej tsis zoo, ⑵ lub phaj siab loj dhau, thiab ⑶ lub zog cua tsis txaus.
Thaum txiav txim siab tias nws yog thawj qhov laj thawj lossis qhov laj thawj thib peb, peb tuaj yeem daws nws los ntawm kev kho qhov siab ntawm rab phom kua nplaum; thaum txiav txim siab tias nws yog qhov laj thawj thib ob, kev txiav txim siab lub thoob nrog lub caliber sib phim tuaj yeem daws qhov teeb meem. Yog tias qhov ceev ntawm cov kua nplaum tso tawm qeeb thaum siv ib txwm, nws yuav yog tias lub hauv paus sib tov thiab lub lim dej lim tau thaiv. Thaum pom, cov khoom siv yuav tsum tau ntxuav raws sijhawm.
2.3 Lub sijhawm rub tawm sai dhau los yog qeeb dhau
Lub sijhawm tawg ntawm cov nplaum tsim qauv yog lub sijhawm uas nws siv rau cov colloid hloov ntawm cov nplaum mus rau lub cev elastic tom qab sib tov, thiab feem ntau nws raug kuaj txhua 5 feeb. Muaj peb yam tseem ceeb uas cuam tshuam rau kev ziab thiab kho ntawm cov roj hmab nto: (1) qhov cuam tshuam ntawm qhov sib piv ntawm A thiab B Cheebtsam, thiab lwm yam; (2) kub thiab av noo (qhov cuam tshuam ntawm kub yog qhov tseem ceeb); (3) cov mis ntawm cov khoom nws tus kheej tsis zoo.
Qhov kev daws teeb meem rau qhov laj thawj (1) yog kho qhov sib piv. Kev nce qhov sib piv ntawm cov khoom B tuaj yeem ua rau lub sijhawm kho kom luv dua thiab ua rau cov txheej nplaum tawv thiab tawg; thaum txo qhov sib piv ntawm cov neeg sawv cev kho yuav ua rau lub sijhawm kho kom ntev dua, cov txheej nplaum yuav mos dua, qhov tawv yuav txhim kho thiab lub zog yuav nce ntxiv. txo.
Feem ntau, qhov piv ntawm cov khoom A: B tuaj yeem hloov kho ntawm (9 ~ 13: 1). Yog tias qhov sib piv ntawm cov khoom B siab, qhov ceev ntawm cov tshuaj tiv thaiv yuav sai dua thiab lub sijhawm tawg yuav luv dua. Yog tias qhov tshuaj tiv thaiv sai dhau, lub sijhawm rau kev txiav thiab nres rab phom yuav raug cuam tshuam. Yog tias nws qeeb dhau, nws yuav cuam tshuam rau lub sijhawm ziab ntawm cov colloid. Lub sijhawm tawg feem ntau raug kho ntawm 20 thiab 60 feeb. Kev ua haujlwm ntawm cov colloid tom qab kho hauv qhov sib piv no yeej zoo ib yam. Tsis tas li ntawd, thaum qhov kub ntawm kev tsim kho siab dhau lossis qis dhau, peb tuaj yeem txo lossis nce qhov sib piv ntawm cov khoom B (tus neeg sawv cev kho), kom ua tiav lub hom phiaj ntawm kev kho lub sijhawm ziab thiab kho ntawm cov colloid. Yog tias muaj teeb meem nrog cov khoom nws tus kheej, cov khoom yuav tsum tau hloov.
2.4 "Paj nplaum" tshwm sim hauv cov txheej txheem ntawm kev nplaum
Cov paj noob hlis yog tsim los ntawm kev sib xyaw tsis sib xws ntawm cov colloids ntawm cov khoom A / B, thiab nws tshwm sim ua kab dawb hauv zos. Cov laj thawj tseem ceeb yog: ⑴Cov kav dej ntawm cov khoom B ntawm lub tshuab kua nplaum raug thaiv; ⑵Lub tshuab sib tov tsis tau ntxuav ntev; ⑶Qhov nplai xoob thiab qhov ceev ntawm cov kua nplaum tsis sib xws; Nws tuaj yeem daws tau los ntawm kev ntxuav cov khoom siv; vim li cas (3), koj yuav tsum xyuas qhov kev tswj hwm proportional thiab ua qhov kev hloov kho kom haum.
2.5 Kev txiav tawv nqaij lossis kev sib xyaw ua ke ntawm cov colloid thaum lub sijhawm ua kua nplaum
Thaum cov nplaum ob yam khoom kho ib nrab thaum lub sijhawm sib tov, cov kua nplaum uas tsim los ntawm rab phom kua nplaum yuav zoo li tawv nqaij lossis vulcanization. Thaum tsis muaj qhov tsis zoo hauv kev kho thiab qhov ceev ntawm cov kua nplaum, tab sis cov kua nplaum tseem crusted lossis vulcanized, nws yuav yog tias cov khoom siv tau kaw ntev, rab phom kua nplaum tsis tau ntxuav lossis rab phom tsis tau ntxuav kom huv si, thiab cov crust lossis vulcanized kua nplaum yuav tsum tau ntxuav. Kev tsim kho tom qab ntxuav.
2.6 Muaj cov pa npuas hauv cov silicone sealant
Feem ntau hais lus, lub colloid nws tus kheej tsis muaj cov pa npuas, thiab cov pa npuas hauv lub colloid yuav sib xyaw nrog huab cua thaum lub sijhawm thauj mus los lossis kev tsim kho, xws li: ⑴Cov pa tawm tsis raug ntxuav thaum lub thoob roj hmab hloov; ⑵Cov khoom raug nias rau ntawm lub phaj tom qab muab tso rau ntawm lub tshuab Tsis nias, ua rau tsis ua npuas. Yog li ntawd, cov ua npuas yuav tsum tau muab tshem tawm kom huv si ua ntej siv, thiab lub tshuab kua nplaum yuav tsum tau ua haujlwm kom raug thaum siv kom ntseeg tau tias kev sib khi thiab tiv thaiv huab cua nkag mus.
2.7 Kev nplaum tsis zoo rau cov khoom siv
Cov tshuaj nplaum tsis yog cov nplaum uas siv tau rau txhua yam, yog li nws tsis tuaj yeem lav tias yuav lo tau zoo nrog txhua lub substrates hauv kev siv tiag tiag. Nrog rau ntau yam kev kho saum npoo ntawm lub substrate thiab cov txheej txheem tshiab, qhov ceev ntawm kev sib txuas thiab cov nyhuv ntawm kev sib txuas ntawm cov tshuaj nplaum thiab cov substrates kuj txawv.
Muaj peb hom kev puas tsuaj rau qhov sib txuas ntawm cov nplaum thiab cov khoom siv hauv pem teb. Ib qho yog kev puas tsuaj sib koom ua ke, uas yog, lub zog sib koom ua ke > lub zog sib koom ua ke; qhov thib ob yog kev puas tsuaj los ntawm kev sib txuas, uas yog, lub zog sib koom ua ke < lub zog sib koom ua ke. Thaj chaw puas tsuaj ntawm qhov sib koom ua ke tsawg dua lossis sib npaug li 20% yog qhov tsim nyog, thiab thaj chaw puas tsuaj los ntawm kev sib txuas ntau dua 20% yog qhov tsis tsim nyog; thaj chaw puas tsuaj los ntawm kev sib txuas ntau dua 20% yog qhov tshwm sim tsis zoo hauv kev siv tiag tiag. Tej zaum yuav muaj rau qhov laj thawj hauv qab no vim li cas cov nplaum tsis lo rau ntawm cov khoom siv hauv pem teb:
⑴ Lub substrate nws tus kheej nyuaj rau kev sib txuas, xws li PP thiab PE. Vim lawv cov crystallinity molecular siab thiab qhov tsis tshua muaj kev ntxhov siab ntawm qhov chaw, lawv tsis tuaj yeem tsim cov saw hlau molecular diffusion thiab entanglement nrog feem ntau cov tshuaj, yog li lawv tsis tuaj yeem tsim kev sib txuas zoo ntawm qhov sib txuas. Kev nplaum;
⑵ Qhov ntau ntawm cov khoom sib txuas yog nqaim, thiab nws tsuas yog ua haujlwm rau qee cov substrates;
⑶ Lub sijhawm txij nkawm tsis txaus. Feem ntau, cov nplaum ob-component yuav tsum tau kho kom zoo tsawg kawg 3 hnub, thaum cov nplaum ib-component yuav tsum tau kho kom zoo rau 7 hnub. Yog tias qhov kub thiab txias ntawm qhov chaw kho kom zoo qis, lub sijhawm kho kom zoo yuav tsum tau ntev dua.
⑷ Qhov piv ntawm cov khoom A thiab B tsis yog lawm. Thaum siv cov khoom ob-component, tus neeg siv yuav tsum ua raws li qhov piv uas tus neeg tsim khoom xav tau los kho qhov piv ntawm cov kua nplaum thiab cov neeg sawv cev kho, txwv tsis pub teeb meem yuav tshwm sim thaum ntxov ntawm kev kho, lossis thaum kawg ntawm kev siv hauv kev nplaum, kev tiv thaiv huab cua thiab kev ruaj khov. lo lus nug;
⑸ Yog tias koj tsis tau ntxuav lub substrate raws li qhov xav tau. Vim tias cov hmoov av, av qias neeg thiab cov khoom tsis huv ntawm qhov chaw ntawm lub substrate yuav ua rau kev sib txuas tsis zoo, nws yuav tsum tau ntxuav ua ntej siv kom ntseeg tau tias cov nplaum thiab lub substrate sib txuas zoo.
⑹ Yog tias koj tsis siv cov tshuaj pleev xim raws li qhov xav tau. Cov tshuaj pleev xim no yog siv rau kev kho ua ntej ntawm qhov chaw ntawm cov txhuas profile, uas tuaj yeem txhim kho qhov tsis kam dej thiab kev ruaj khov ntawm cov ntawv sib txuas thaum lub sijhawm luv luv ntawm kev sib txuas. Yog li ntawd, hauv kev siv engineering tiag tiag, peb yuav tsum siv cov tshuaj pleev xim kom raug thiab zam kom tsis txhob muaj cov kua nplaum uas tshwm sim los ntawm kev siv tsis raug.
2.8 Kev tsis sib haum xeeb nrog cov khoom siv ntxiv
Qhov laj thawj rau qhov tsis sib xws nrog cov khoom siv yog tias cov sealant muaj kev cuam tshuam lub cev lossis tshuaj lom neeg nrog cov khoom siv sib cuag, ua rau muaj kev phom sij xws li kev hloov pauv ntawm cov nplaum qauv, tsis lo rau lub substrate, kev puas tsuaj ntawm kev ua haujlwm ntawm cov nplaum qauv, thiab lub neej luv ntawm cov nplaum qauv.
3. Xaus Lus
Cov nplaum silicone muaj zog heev, ruaj khov heev, tiv taus kev laus zoo heev, tiv taus kub siab thiab lwm yam zoo heev, thiab siv dav hauv kev sib txuas ntawm cov phab ntsa ntaub thaiv tsev. Txawm li cas los xij, hauv kev siv tiag tiag, vim yog tib neeg tej yam thiab cov teeb meem ntawm cov khoom siv xaiv (cov lus qhia tsim kho tsis tuaj yeem ua raws li qhov yuav tsum tau ua), kev ua haujlwm ntawm cov nplaum tsim kho raug cuam tshuam loj heev, thiab txawm tias ua tsis raug. Yog li ntawd, kev sim sib xws thiab kev sim lo ntawm cov iav, cov khoom siv txhuas thiab cov khoom siv yuav tsum tau kuaj xyuas ua ntej kev tsim kho, thiab cov kev cai ntawm txhua qhov txuas yuav tsum tau ua raws li qhov yuav tsum tau ua thaum lub sijhawm tsim kho, kom ua tiav cov txiaj ntsig ntawm cov nplaum tsim kho thiab xyuas kom meej qhov zoo ntawm qhov project.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-30-2022