Tsis yog qhov no yuav tsis tho txawv, ncaj ncees-tshwj xeeb yog tias koj nyiam cov khoom siv roj hmab. Yog tias koj nyeem rau, koj yuav pom yuav luag txhua yam koj xav paub txog One-Part Silicone Sealants.
1) Lawv yog dab tsi
2) Yuav ua li cas rau lawv
3) Qhov twg siv lawv
Taw qhia
Dab tsi yog ib feem ntawm silicone sealant?
Muaj ntau hom tshuaj tua kab mob-Silicon, Polyurethane thiab Polysulfide yog cov paub zoo tshaj plaws. Lub npe yog los ntawm cov caj qaum ntawm cov molecules koom nrog.
Silicone pob txha yog:
Si - O - Si - O - Si - O - Si
Hloov kho silicone yog cov cuab yeej tshiab (hauv Teb Chaws Asmeskas tsawg kawg) thiab txhais tau hais tias cov pob txha organic kho nrog silane chemistry. Ib qho piv txwv yog alkoxysilane terminated polypropylene oxide.
Tag nrho cov chemistry no tuaj yeem yog ib feem lossis ob feem uas pom tseeb muaj feem cuam tshuam rau tus lej ntawm qhov koj xav tau kom tau txais cov khoom kho. Yog li ntawd, ib feem tsuas yog txhais tau tias qhib lub raj, cartridge lossis lub thawv thiab koj cov khoom yuav kho. Feem ntau, cov txheej txheem ib feem cuam tshuam nrog cov dej noo hauv huab cua kom dhau los ua roj hmab.
Yog li, ib feem ntawm silicone yog ib qho system uas ruaj khov nyob rau hauv lub raj kom txog thaum, ntawm huab cua, nws kho kom tsim tau cov roj hmab silicone.
Qhov zoo
Ib feem ntawm silicones muaj ntau yam zoo.
-Thaum compounded kom raug lawv muaj kev ruaj khov thiab txhim khu kev qha nrog zoo adhesion thiab lub cev muaj zog. Lub neej txee (lub sijhawm koj tuaj yeem tso rau hauv lub raj ua ntej koj siv) tsawg kawg ib xyoos yog qhov qub nrog qee cov qauv siv tau ntev ntau xyoo. Silicones tseem muaj unquestionably qhov zoo tshaj plaws mus sij hawm ntev kev ua tau zoo. Lawv lub cev lub cev tsis tshua hloov lub sijhawm uas tsis muaj kev cuam tshuam los ntawm UV raug thiab, ntxiv rau, lawv muaj qhov kub thiab txias ruaj khov tshaj li ntawm lwm cov sealants los ntawm tsawg kawg 50 ℃.
-Ib feem ntawm silicones kho tau sai heev, feem ntau tsim daim tawv nqaij li ntawm 5 mus rau 10 feeb, ua tack dawb nyob rau hauv ib teev thiab kho rau cov roj hmab elastic txog 1/10 nti tob hauv tsawg dua ib hnub. Qhov saum npoo muaj qhov zoo rubbery xav.
-Vim lawv muaj peev xwm ua tau translucent uas yog ib qho tseem ceeb feature nyob rau hauv nws tus kheej (translucent yog feem ntau siv xim), nws yog ib qho yooj yim rau pigment lawv mus rau tej xim.
Kev txwv
Silicones muaj ob qhov kev txwv tseem ceeb.
1) Lawv tsis tuaj yeem pleev xim los ntawm cov xim pleev xim dej-nws tuaj yeem ua kom yooj yim nrog cov xim hnyav hnyav thiab.
2) Tom qab kho, lub sealant tuaj yeem tso qee yam ntawm nws cov silicone plasticizer uas, thaum siv hauv kev sib koom ua ke, tuaj yeem tsim cov stains tsis zoo nyob ntawm ntug ntawm qhov sib koom ua ke.
Tau kawg, vim qhov xwm txheej ntawm kev ua ib feem nws tsis tuaj yeem tau txais qhov nrawm nrawm los ntawm kev kho vim tias lub kaw lus yuav tsum tau hnov qab nrog huab cua yog li kho los ntawm sab saum toj. Tau txais qhov tshwj xeeb me ntsis, silicones tsis tuaj yeem siv los ua ib lub foob hauv cov iav insulated vim. Txawm hais tias lawv tau zoo heev ntawm kev khaws cov kua dej ntau tawm, cov dej vapor kis tau yooj yim los ntawm kev kho cov roj hmab silicone ua rau IG units pos huab.
Cov cheeb tsam kev lag luam thiab kev siv
Ib feem ntawm silicones yog siv los ntawm txhua qhov chaw thiab txhua qhov chaw, suav nrog, rau kev ntxhov siab ntawm qee tus tswv tsev, qhov twg ob qhov kev txwv tau hais los saum toj no ua rau muaj teeb meem.
Kev tsim kho thiab DIY kev lag luam suav rau cov ntim loj ua raws li tsheb, kev lag luam, hluav taws xob thiab aerospace. Raws li nrog tag nrho cov sealants, ib feem ntawm silicones 'lub luag haujlwm tseem ceeb yog ua raws thiab sau qhov sib txawv ntawm ob qho tib si los yog sib txawv ntawm cov substrates los tiv thaiv dej los yog cov ntawv sau los ntawm. Qee lub sij hawm ib qho formulation yuav tsis yooj yim hloov dua li ua kom nws ntws ntau dua thaum nws dhau los ua txheej. Txoj hauv kev zoo tshaj plaws rau kev sib txawv ntawm cov txheej txheej, nplaum thiab sealant yog qhov yooj yim. Lub sealant sealing nruab nrab ntawm ob qhov chaw thaum lub txheej txheej npog thiab tiv thaiv ib leeg thaum lub nplaum feem ntau khaws ob qhov chaw ua ke. Lub sealant feem ntau zoo li cov nplaum nplaum thaum nws siv hauv cov txheej txheem glazing lossis insulated glazing, txawm li cas los xij, nws tseem ua haujlwm los muab ob lub substrates ntxiv rau kom lawv ua ke.
Basic Chemistry
Lub silicone sealant nyob rau hauv lub xeev uncured feem ntau zoo li ib tug tuab muab tshuaj txhuam los yog qab zib. Thaum raug huab cua, cov pab pawg reactive kawg ntawm silicone polymer hydrolyze (hloov nrog dej) thiab tom qab ntawd koom nrog ib leeg, tso dej thiab tsim cov hlua polymer ntev uas txuas ntxiv mus rau ib leeg mus txog thaum kawg cov tshuaj txhuam tau hloov mus ua cov roj hmab zoo nkauj. Cov pab pawg reactive nyob rau hauv qhov kawg ntawm silicone polymer los ntawm qhov tseem ceeb tshaj plaws ntawm cov formulation (tsis suav cov polymer nws tus kheej) uas yog lub crosslinker. Nws yog tus crosslinker uas muab cov sealant nws cov yam ntxwv yam ncaj qha xws li tsw thiab kho tus nqi, los yog tsis ncaj qha xws li xim, adhesion, thiab lwm yam. vim hais tias ntawm lwm yam raw cov ntaub ntawv uas tej zaum yuav siv nrog tej crosslinker systems xws li muab tub lim thiab adhesion promotors. . Xaiv txoj cai crosslinker yog qhov tseem ceeb rau kev txiav txim siab qhov kawg ntawm lub sealant.
Kev kho hom
Muaj ntau qhov sib txawv curing systems.
1) Acetoxy (acidic vinegar tsw)
2) Oxim
3) Alkoxy
4) Benzamide
5) Amine
6) Aminoxy
Oximes, alkoxies thiab benzamides (ntau dav siv hauv Tebchaws Europe) yog qhov hu ua nruab nrab lossis tsis muaj kua qaub. Cov amines thiab aminoxy systems muaj cov ntxhiab tsw ammonia thiab feem ntau siv ntau dua hauv cov tsheb thiab cov chaw lag luam lossis cov ntawv thov siv sab nraum zoov.
Cov khoom siv raw
Cov qauv tsim muaj ntau yam sib txawv, qee qhov yog xaiv tau, nyob ntawm qhov xav siv kawg.
Tsuas yog cov ntaub ntawv tseem ceeb tseem ceeb yog cov khoom siv polymer reactive thiab crosslinker. Txawm li cas los xij, cov fillers, adhesion promoters, non reactive (plasticizing) polymer thiab catalysts yuav luag ib txwm ntxiv. Tsis tas li ntawd, ntau lwm yam khoom siv ntxiv tuaj yeem siv tau xws li xim pastes, fungicides, nplaim hluav taws kub, thiab kub stabilizers.
Basic Formulations
Ib qho kev tsim kho oxime lossis DIY sealant formulation yuav zoo li:
| % | ||
| Polydimethylsiloxane, OH txiav tawm 50,000cps | 65.9 ua | Polymer |
| Polydimethylsiloxane, trimethylterminated, 1000cps | 20 | Plasticizer |
| Methyltrioximinosilane | 5 | Crosslinker |
| Aminopropyltriethoxysilane | 1 | Adhesion txhawb nqa |
| 150 sq.m / g thaj tsam fumed silica | 8 | Filler |
| Dibutyltin dilaurate | 0.1 | Catalyst |
| Tag nrho | 100 |
Lub cev muaj zog
Cov yam ntxwv ntawm lub cev muaj xws li:
| Elongation (%) | 550 |
| Tensile zog (MPa) | 1.9 |
| Modulus ntawm 100 Elongation (MPa) | 0.4 |
| Shore Ib Hardness | 22 |
| Daim tawv nqaij dhau sijhawm (min) | 10 |
| Tack Dawb Sijhawm (min) | 60 |
| Scratch Time (min) | 120 |
| Los ntawm Kev Kho Mob (mm hauv 24 teev) | 2 |
Formulations siv lwm cov crosslinkers yuav zoo sib xws tej zaum txawv nyob rau hauv crosslinker theem, hom adhesion txhawb nqa thiab kho catalysts. Lawv lub cev lub cev yuav txawv me ntsis tshwj tsis yog tias cov saw txuas txuas txuas nrog. Qee lub tshuab tsis tuaj yeem ua tau yooj yim tshwj tsis yog siv ntau cov chalk muab tub lim. Cov hom formulations pom tseeb tsis tuaj yeem tsim nyob rau hauv hom ntshiab lossis translucent.
Txhim kho Sealants
Muaj 3 theem los tsim ib lub sealant tshiab.
1) Kev xav, kev tsim khoom thiab kev sim hauv chav kuaj - qhov ntim me me
Ntawm no, tus kws kuaj mob kuaj mob muaj cov tswv yim tshiab thiab feem ntau pib nrog ib lub tes ntawm 100 grams ntawm sealant tsuas yog saib seb nws kho li cas thiab cov roj hmab zoo li cas. Tam sim no muaj lub tshuab tshiab muaj "The Hauschild Speed Mix" los ntawm FlackTek Inc. Lub tshuab tshwj xeeb no yog qhov zoo tagnrho rau kev sib xyaw cov 100g me me hauv vib nas this thaum tshem tawm cua. Qhov no yog qhov tseem ceeb txij li tam sim no nws tso cai rau tus tsim tawm los ntsuas lub cev ntawm cov khoom me me no. Fumed silica lossis lwm cov khoom ntim xws li cov av nplaum nplaum tuaj yeem muab sib xyaw rau hauv silicone li ntawm 8 vib nas this. De-airing yuav siv li 20-25 vib nas this. Lub tshuab ua haujlwm los ntawm txoj kev ntawm ob lub asymmetric centrifuge mechanism uas pib siv cov khoom lawv tus kheej ua lawv tus kheej sib xyaw caj npab. Qhov sib tov loj tshaj plaws yog 100 grams thiab ntau hom khob sib txawv muaj xws li siv pov tseg, uas txhais tau tias tsis muaj kev ntxuav kiag li.
Qhov tseem ceeb hauv cov txheej txheem formulation tsis yog tsuas yog cov khoom xyaw, tab sis kuj yog qhov kev txiav txim ntawm qhov sib ntxiv thiab sib tov lub sij hawm. Raws li kev cais tawm lossis tshem tawm huab cua yog qhov tseem ceeb kom tso cai rau cov khoom kom muaj lub neej txee, vim huab cua npuas muaj cov dej noo uas yuav ua rau lub sealant kho los ntawm sab hauv.
Thaum tus kws kho mob tau txais hom sealant uas yuav tsum tau ua rau nws daim ntawv thov tshwj xeeb nce mus txog 1 quart planetary tov khoom uas tuaj yeem tsim txog 3-4 me me 110 ml (3oz) hlab. Qhov no yog cov khoom siv txaus rau kev sim thawj lub txee lub neej thiab kev kuaj adhesion ntxiv rau lwm cov kev cai tshwj xeeb.
Tom qab ntawd nws tuaj yeem mus rau 1 lossis 2 nkas loos tshuab los tsim 8-12 10 oz raj rau ntau qhov kev ntsuas qhov tob thiab cov neeg siv khoom sampling. Lub sealant yog extruded los ntawm lub lauj kaub los ntawm ib lub tog raj kheej hlau rau hauv lub cartridge uas haum rau lub tog raj kheej ntim. Tom qab cov kev ntsuam xyuas no, nws npaj txhij rau kev nce qib.
2) Scale-up thiab zoo tuning-nruab nrab ntim
Nyob rau hauv lub scale nce, lub lab formulation yog tam sim no ua nyob rau hauv ib tug loj tshuab feem ntau nyob rau hauv ntau yam ntawm 100-200kg los yog hais txog ib tug nruas. Cov kauj ruam no muaj ob lub hom phiaj tseem ceeb
a) txhawm rau saib seb puas muaj kev hloov pauv tseem ceeb ntawm 4 lb qhov loj thiab qhov loj dua no uas tuaj yeem tshwm sim los ntawm kev sib xyaw thiab kev sib cais, cov tshuaj tiv thaiv thiab qhov sib txawv ntawm qhov sib txawv ntawm qhov sib xyaw, thiab
b) los tsim cov khoom txaus rau cov qauv rau cov neeg siv khoom thiab tau txais qee qhov kev pub noj ntawm txoj haujlwm.
Lub tshuab 50 nkas loos no tseem muaj txiaj ntsig zoo rau cov khoom lag luam thaum muaj cov ntim tsawg lossis cov xim tshwj xeeb thiab tsuas yog ib lub nruas ntawm txhua hom yuav tsum tau tsim ib zaug.
Muaj ntau ntau hom kev sib xyaw tshuab. Qhov ob feem ntau siv yog planetary mixers (raws li qhia saum toj no) thiab high-speed dispersers. Lub planetary yog qhov zoo rau kev sib xyaw viscosity siab dua thaum lub disperser ua tau zoo dua tshwj xeeb hauv qis viscosity flowable systems. Hauv kev tsim cov sealants, ob lub tshuab siv tau ntev npaum li ib tus neeg them nyiaj rau lub sijhawm sib xyaw thiab muaj peev xwm tsim hluav taws xob ntawm kev kub ceev disperser.
3) Tag nrho cov nplai ntau lawm
Qhov kawg ntau lawm, uas tej zaum yuav batch los yog tas mus li, cia siab tias tsuas yog reproduces lub kawg formulation los ntawm scale nce qib. Feem ntau, tus nqi me me (2 lossis 3 batch lossis 1-2 teev tas li) ntawm cov khoom yog tsim ua ntej hauv cov cuab yeej tsim khoom thiab kuaj xyuas ua ntej cov khoom tsim tawm.
Kev Xeem - Dab tsi thiab Yuav Ua Li Cas.
Dab tsi
Lub cev muaj zog-Elongation, Tensile Strength thiab Modulus
Adhesion rau tsim nyog substrate
Txee Lub neej-ob leeg nrawm thiab nyob rau hauv chav tsev kub
Kho Tus Nqi-Daim tawv nqaij dhau sij hawm, Tack dawb lub sij hawm, khawb lub sij hawm thiab los ntawm kev kho, xim kub stability los yog stability nyob rau hauv ntau yam kua xws li roj.
Tsis tas li ntawd, lwm yam khoom tseem ceeb raug kuaj xyuas los yog pom: sib xws, tsis muaj ntxhiab tsw, corrosivity thiab dav dav.
Yuav ua li cas
Ib daim ntawv sealant tau kos tawm thiab sab laug los kho rau ib lub lim tiam. Lub tswb nrov tshwj xeeb raug txiav tawm thiab muab tso rau hauv Tensile Tester los ntsuas lub cev lub cev xws li elongation, modulus thiab tensile lub zog. Lawv kuj tau siv los ntsuas adhesion / cohesion rog ntawm cov qauv npaj tshwj xeeb. Kev sim yooj yim yog-tsis muaj adhesion yog ua los ntawm rub ntawm cov hlaws ntawm cov khoom kho rau ntawm cov substrates hauv nqe lus nug.
Ib tug Shore-A meter ntsuas qhov hardness ntawm cov roj hmab. Cov cuab yeej no zoo li qhov hnyav thiab ntsuas nrog lub ntsiab lus nias rau hauv cov qauv kho. Qhov ntau qhov taw tes nkag mus rau cov roj hmab, cov roj hmab softer thiab tus nqi qis dua. Ib tug raug siv sealant yuav nyob rau hauv 15-35 ntau yam.
Daim tawv nqaij dhau sij hawm, tack dawb lub sij hawm thiab lwm yam tshwj xeeb ntawm daim tawv nqaij ntsuas yog ua nrog tus ntiv tes los yog nrog cov ntawv yas nrog qhov hnyav. Lub sijhawm ua ntej cov yas tuaj yeem rub tawm kom huv yog ntsuas.
Rau txee lub neej, cov raj ntawm cov sealant muaj hnub nyoog nyob rau hauv chav tsev kub (uas ib txwm siv sijhawm 1 xyoos los ua pov thawj 1 xyoo txee lub neej) lossis ntawm qhov kub siab, feem ntau 50 ℃ rau 1,3,5,7 lub lis piam thiab lwm yam. Ua raws li kev laus. txheej txheem (lub raj tso cai rau kom txias nyob rau hauv cov ntaub ntawv ceev), cov khoom yog extruded los ntawm lub raj thiab kos rau hauv ib daim ntawv uas nws tso cai rau kho. Lub cev lub cev ntawm cov roj hmab tsim nyob rau hauv cov nplooj ntawv no tau sim ua ntej. Cov khoom no ces muab piv rau cov khoom siv tshiab tshiab los txiav txim siab lub neej txee tsim nyog.
Cov lus piav qhia tshwj xeeb ntawm cov kev xeem feem ntau xav tau tuaj yeem pom hauv ASTM phau ntawv qhia.
Qee Cov Lus Qhia Kawg
Ib feem ntawm silicones yog cov sealants zoo tshaj plaws muaj. Lawv muaj kev txwv thiab yog tias xav tau tshwj xeeb, lawv tuaj yeem tsim tshwj xeeb.
Nws yog ib qho tseem ceeb kom paub tseeb tias tag nrho cov ntaub ntawv raw yog qhuav li sai tau, cov formulation yog ruaj khov thiab cov huab cua raug tshem tawm hauv cov txheej txheem ntau lawm.
Kev tsim kho thiab kev sim yog qhov tseem ceeb tib yam txheej txheem rau ib qho ntawm ib feem sealant tsis hais hom-tsuas yog ua kom koj tau kuaj xyuas txhua yam khoom ua ntej koj pib tsim cov khoom ntau thiab koj muaj kev nkag siab meej txog cov kev xav tau ntawm daim ntawv thov.
Nyob ntawm daim ntawv thov yuav tsum tau, cov tshuaj kho kom raug xaiv tau. Piv txwv li, yog tias ib qho silicone raug xaiv thiab tsw, corrosion thiab adhesion tsis yog qhov tseem ceeb tab sis tus nqi qis yog xav tau, ces acetoxy yog txoj hauv kev mus. Txawm li cas los xij, yog tias cov khoom siv hlau uas yuav raug corroded los yog tshwj xeeb adhesion rau yas yog yuav tsum tau nyob rau hauv ib tug tshwj xeeb glossy xim ces koj xav tau ib tug oxime.
[1] Dale Flackett. Silicon Compounds: Silanes thiab Silicones [M]. Gelest Inc: 433-439
* Duab los ntawm OLIVIA Silicone Sealant
Lub sij hawm xa tuaj: Mar-31-2024
