Sealant yog hais txog cov khoom siv sib khi uas deforms nrog cov duab ntawm qhov chaw sib khi, tsis yooj yim ntws, thiab muaj qee qhov nplaum.
Nws yog ib yam nplaum uas siv los sau cov qhov sib txawv ntawm kev sib khi. Nws muaj cov haujlwm tiv thaiv kev xau, tiv thaiv dej, tiv thaiv kev co, rwb thaiv suab thiab rwb thaiv cua sov. Feem ntau, cov khoom qhuav lossis tsis qhuav xws li asphalt, natural resin lossis synthetic resin, natural rubber lossis synthetic rubber yog siv ua cov khoom siv hauv paus, thiab cov khoom inert xws li talc, av nplaum, carbon black, titanium dioxide thiab asbestos ntxiv rau. Cov plasticizers, cov kuab tshuaj, cov neeg sawv cev curing, accelerators, thiab lwm yam. Nws muaj peb pawg: elastic sealant, kua sealing gasket thiab sealing putty. Nws yog siv dav hauv kev sib khi ntawm kev tsim kho, kev thauj mus los, cov cuab yeej hluav taws xob thiab cov khoom.
Muaj ntau hom sealant: Silicone sealant, polyurethane sealant, polysulfide sealant, acrylic sealant, anaerobic sealant, epoxy sealant, butyl sealant, neoprene sealant, PVC sealant, thiab asphalt sealant.
Cov yam ntxwv tseem ceeb ntawm cov sealant
(1) Qhov tsos: Qhov tsos ntawm cov sealant feem ntau yog txiav txim siab los ntawm kev sib kis ntawm cov khoom sau hauv lub hauv paus. Cov khoom sau yog hmoov khov. Tom qab raug sib kis los ntawm lub tshuab kneader, lub tshuab sib tsoo thiab lub tshuab planetary, nws tuaj yeem sib kis sib npaug hauv cov roj hmab hauv paus kom ua cov nplaum zoo. Me ntsis ntawm cov xuab zeb me me yog qhov lees txais thiab ib txwm muaj. Yog tias cov khoom sau tsis sib kis zoo, ntau cov khoom me me heev yuav tshwm sim. Ntxiv nrog rau kev sib kis ntawm cov khoom sau, lwm yam tseem yuav cuam tshuam rau qhov tsos ntawm cov khoom, xws li kev sib xyaw ntawm cov khoom tsis huv, cov tawv nqaij, thiab lwm yam. Cov rooj plaub no suav tias yog qhov tsis zoo.
(2) Qhov Nyuaj
(3) Lub zog tensile
(4) Kev ntev
(5) Lub zog tensile thiab kev hloov chaw muaj peev xwm
(6) Kev nplaum rau cov khoom siv
(7) Extrusion: Qhov no yog qhov kev ua tau zoo ntawm kev tsim cov sealant Ib yam khoom siv los qhia qhov nyuaj ntawm cov sealant thaum nws siv. Cov kua nplaum tuab dhau yuav muaj kev extrudability tsis zoo, thiab nws yuav nyuaj heev rau kua nplaum thaum nws siv. Txawm li cas los xij, yog tias cov kua nplaum yog ua nyias dhau tsuas yog xav txog qhov extrudability, nws yuav cuam tshuam rau thixotropy ntawm cov sealant. Qhov extrudability tuaj yeem ntsuas los ntawm txoj kev teev tseg hauv tus qauv hauv tebchaws.
(8) Thixotropy: Qhov no yog lwm yam khoom ntawm kev ua tau zoo ntawm cov sealant. Thixotropy yog qhov sib txawv ntawm fluidity, uas txhais tau tias cov sealant tsuas yog hloov nws cov duab nyob rau hauv qee qhov siab, thiab tuaj yeem tswj nws cov duab thaum tsis muaj lub zog sab nraud. Kev txiav txim siab ntawm qhov sag teev tseg los ntawm tus qauv hauv tebchaws yog qhov kev txiav txim siab ntawm thixotropy ntawm cov sealant.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-04-2022