Sealant yog hais txog cov khoom sib khi uas deforms nrog cov duab ntawm lub sealing nto, tsis yooj yim rau ntws, thiab muaj ib qho adhesiveness.
Nws yog ib qho nplaum siv los sau cov qhov khoob rau kev sib khi. Nws muaj kev ua haujlwm ntawm kev tiv thaiv dej, tsis muaj dej, tiv thaiv kev vibration, suab rwb thaiv tsev thiab rwb thaiv tsev kub. Feem ntau, cov ntaub ntawv qhuav los yog tsis qhuav qhuav xws li asphalt, ntuj resin lossis hluavtaws cob, roj hmab lossis hluavtaws roj hmab yog siv los ua cov khoom siv hauv paus, thiab cov khoom siv tsis zoo xws li talc, av nplaum, carbon dub, titanium dioxide thiab asbestos ntxiv. Plasticizers, solvents, curing agents, accelerators, etc. Nws tuaj yeem muab faib ua peb pawg: elastic sealant, kua sealing gasket thiab sealing putty. Nws yog dav siv hauv kev sib khi ntawm kev tsim kho, kev thauj mus los, cov cuab yeej hluav taws xob thiab qhov chaw.
Muaj ntau hom sealants: Silicone sealants, polyurethane sealants, polysulfide sealants, acrylic sealants, anaerobic sealants, epoxy sealants, butyl sealants, neoprene sealants, PVC sealants, thiab asphalt sealants.
Cov khoom tseem ceeb ntawm sealant
(1) Qhov tshwm sim: Cov tsos ntawm lub sealant yog txiav txim siab los ntawm kev tawg ntawm cov muab tub lim hauv lub hauv paus. Cov muab tub lim yog cov hmoov tawv. Tom qab dispersed los ntawm ib tug kneader, ib tug grinder thiab lub planetary tshuab, nws muaj peev xwm yuav sib npaug zos rau hauv lub hauv paus roj hmab los tsim ib tug zoo muab tshuaj txhuam. Ib qho me me ntawm kev nplua me me los yog xuab zeb tau txais thiab ib txwm muaj. Yog hais tias tus muab tub lim tsis zoo dispersed, ntau coarse hais yuav tshwm sim. Ntxiv rau qhov dispersion ntawm fillers, lwm yam tseem ceeb kuj yuav cuam tshuam rau cov tsos ntawm cov khoom, xws li sib tov ntawm particulate impurities, crusting, thiab lwm yam. Cov rooj plaub no yog suav tias yog ntxhib nyob rau hauv tsos.
(2) Hardness
(3) Tensile zog
(4) Elongation
(5) Tensile modulus thiab muaj peev xwm hloov chaw
(6) Adhesion rau substrate
(7) Extrusion: Qhov no yog kev ua haujlwm ntawm sealant tsim Ib yam khoom siv los qhia qhov nyuaj ntawm sealant thaum nws siv. Cov kua nplaum tuab heev yuav muaj qhov tsis zoo extrudability, thiab nws yuav nyuaj heev rau cov kua nplaum thaum nws siv. Txawm li cas los xij, yog tias cov kua nplaum ua rau nyias nyias tsuas yog xav txog qhov extrudability, nws yuav cuam tshuam rau thixotropy ntawm sealant. Lub extrudability tuaj yeem ntsuas los ntawm cov txheej txheem teev tseg hauv lub teb chaws tus qauv.
(8) Thixotropy: Qhov no yog lwm yam khoom ntawm kev tsim kho ntawm cov sealant. Thixotropy yog qhov sib txawv ntawm fluidity, uas txhais tau hais tias lub sealant tsuas tuaj yeem hloov nws cov duab nyob rau hauv ib qho kev siab, thiab tuaj yeem tswj tau nws cov duab thaum tsis muaj zog sab nraud. zoo tsis ntws. Kev txiav txim siab ntawm sag teev los ntawm lub teb chaws tus qauv yog kev txiav txim ntawm thixotropy ntawm lub sealant.
Post lub sij hawm: Nov-04-2022