viscosity
- Thaum ib qho khoom txav mus, muaj qhov sib txheeb ntawm cov txheej txheem dej uas nyob ib sab, uas ua rau muaj kev sib txhuam ntawm ob txheej dej,
lub npe hu ua viscous force. Viscosity yog qhov ntsuas lub cev siv los ntsuas qhov loj ntawm lub zog khov. Nws tus nqi yog txiav txim los ntawm yam xws li
hom khoom, kub, thiab concentration.
- Chav tsev ntawm viscosity yog Pascal-thib ob (Pa·s).
-Cov viscosity ntawm cov khoom cuam tshuam rau nws cov fluidity thiab directionality nyob rau hauv cov pwm, uas cuam tshuam rau cov tsos ntawm cov khoom. Tshwj xeeb
nyob rau hauv tej cheeb tsam xws li cov chaw tuag los yog nkhaus seem ntawm cov pwm, nws yog nquag ua rau huab cua entrapment thiab tsis zoo curing.
Hardness
- Lub hardness ntawm silicone roj hmab yog qhia nyob rau hauv Shore hardness, tseem hu ua Shore A hardness, qhia hais tias tsis kam ntawm ib yam khoom ntawm ib tug tshwj xeeb daim duab rau indentation nyob rau hauv ib tug tshwj xeeb load. Lub Nkoj A hardness nplai yog li ntawm 0 txog 100, nrog 0 yog tus nqi qis tshaj plaws thiab 100 yog qhov siab tshaj.
- Silicone feem ntau muaj Shore hardness ntau ntawm 10 txog 80. Los ntawm kev sib xyaw polymer substrates, fillers, thiab additives nyob rau hauv sib txawv proportions, ntau intermediate hardness qhov tseem ceeb yuav ua tau tiav. Ib yam li ntawd, lub sij hawm thiab qhov kub thiab txias ntawm kev kho cua sov kuj tuaj yeem hloov qhov hardness yam tsis muaj kev cuam tshuam lwm yam ntawm lub cev.
- Shore hardness tester: suav nrog Shore A, Shore D, thiab Shore 00. Qhov ntsuas qhov tseeb ntawm Shore A hardness tester yog 10 ~ 90. Thaum Shore A<10, it is necessary to switch to Shore 00 for testing. When Shore A>90, nws yuav tsum tau hloov mus rau Shore D rau kev sim.
Specific Gravity
- Specific gravity, also known as relative density, is the ratio of the density of a substance (in a completely dense state) to the density of pure H2O at 3.98℃under standard atmospheric pressure (999.972 kg/m3).
- Qhov tshwj xeeb lub ntiajteb txawj nqus yog qhov tsis muaj qhov loj, txhais tau tias nws yog tus nqi tsis muaj units, thiab feem ntau nws txawv nrog qhov kub thiab txias.
- Qhov ntom ntawm silica gel feem ntau siab dua li cov dej, feem ntau nyob ntawm qhov muab tub lim ntawm silica gel
Tensile zog
- Lub zog tensile, tseem hu ua tensile lub zog, yog hais txog lub zog uas yuav tsum tau muaj nyob rau hauv ib cheeb tsam kom ua rau cov khoom siv silicone ua kua muag.
- Chav tsev ntawm tensile zog yog Newton ib square centimeter (N/cm2) los yog Pascal (Pa).
- Lub zog tensile dav dav ntawm cov khoom siv silicone roj hmab yog nruab nrab ntawm 4.0 thiab 12.5 MPa.
- Lub zog tensile dav dav ntawm fluorosilicone roj hmab yog nyob nruab nrab ntawm 8.7 thiab 12.1 MPa.
- Lub zog tensile dav dav ntawm cov kua silicone roj hmab yog nyob nruab nrab ntawm 3.6 thiab 11.0 MPa
Elongation ntawm Break
- Elongation thaum so yog hais txog qhov feem pua nce hauv qhov ntev ntawm tus qauv thaum nws tawg.
- Cov txheej txheem sib txawv thiab cov kev xaiv ntawm hardeners tuaj yeem hloov kho nws tus nqi elongation. Lub elongation tus nqi ntawm silicone yog ze ze rau qhov kub thiab txias.
- Qhov dav dav elongation tus nqi ntawm cov khoom silicone yog nyob nruab nrab ntawm 90% thiab 1120%.
- Qhov dav dav elongation tus nqi ntawm fluorosilicone roj hmab yog nyob nruab nrab ntawm 159% thiab 699%.
- Qhov dav dav elongation tus nqi ntawm cov kua silicone roj hmab yog nruab nrab ntawm 220% thiab 900%
Tear Strength
- Tear lub zog yog hais txog qhov kev tiv thaiv rau kev nthuav dav ntawm kev txiav los yog nicks thaum quab yuam siv rau cov qauv txiav.
- Lub zog tsim kua muag ntau ntawm cov khoom siv silicone roj hmab yog nruab nrab ntawm 9 txog 55 kN / m.
- Lub zog tsim kua muag dav dav ntawm fluorosilicone roj hmab yog nyob nruab nrab ntawm 17.5 thiab 46.4 kN / m.
- Lub zog tsim kua muag ntawm cov kua roj hmab silicone feem ntau yog li ntawm 11.5 txog 52 kN / m.
Linear shrinkage
- Linear shrinkage yog hais txog qhov feem pua ntawm qhov yuam kev ntawm qhov ntev ntawm cov khoom siv silicone tom qab kho thiab demolding thiab qhov ntev ntawm qhov
thawj pwm.
Rebound elasticity
- Resilience yog hais txog lub peev xwm ntawm ib yam khoom kom sai sai rov qab mus rau nws qhov qub zoo tom qab lub zog sab nraud ua rau deformation raug tshem tawm. Nws yog feem ntau
ntsuas raws li qhov sib piv ntawm cov zis zog ntawm cov qauv strained thaum lub sij hawm rov qab sai tom qab kev ntxhov siab tshem tawm mus rau lub zog tawm tswv yim xav tau los lim cov
qauv.
- Resilience yog ib qho kev qhia txog qhov loj ntawm cov elastic deformation nyob rau hauv silicone roj hmab nyob rau hauv kev ntxhov siab. Kev sib cuam tshuam ntawm
silicone roj hmab molecules cuam tshuam kev txav ntawm molecular ntu. Ib feem ntawm lub zog ua haujlwm ntawm silicone roj hmab molecules yog siv los kov yeej
Lub viscous tsis kam ntawm molecules, thaum lwm qhov deforms cov saw hlau molecular. Ob lub ntsiab lus no tsim cov viscoelasticity ntawm
silicone roj hmab. Yog li ntawd, silicone roj hmab nthuav tawm ob qho tib si siab elasticity thiab viscosity.
- Yam tseem ceeb cuam tshuam rau kev ua haujlwm ntawm silicone roj hmab:
--Silicon roj hmab nrog siab elongation, tsis tshua muaj deformation, thiab zoo elasticity.
--Silicone roj hmab nrog siab molecular hnyav exhibits zoo elasticity.
--Silicone roj hmab nrog nqaim molecular hnyav faib kuj muaj zoo elasticity.
--Silicone nrog zoo yooj nyob rau hauv nws cov saw molecular exhibits zoo elasticity.
--Txawm li cas los xij, lub zog intermolecular muaj zog tuaj yeem txo qis nws elasticity
Compression deformation tus nqi, Compression Set
- Tus nqi compression deformation yog hais txog tus nqi ntawm qhov deformation mus tas li uas tshwm sim thaum cov khoom raug compressed rau ib qho duab ntawm ib
qee qhov kub thiab khaws cia rau qee lub sijhawm.
- Cov txheej txheem compression piv piv rau feem pua ntawm cov qauv khoom uas tsis rov qab los rau nws qhov siab qub. Piv txwv li, 40% compression
teeb piv qhia tau hais tias tus qauv tsuas yog rov qab tau 60% ntawm nws cov tuab tuab. Ib 100% compression teeb qhia tias tsis muaj kev rov qab los, lub ntsiab lus
tus qauv tseem nyob hauv nws lub xeev compressed.
- Qhov loj ntawm compression deformation feem ntau yog tswj hwm los ntawm kev rov qab muaj peev xwm ntawm silicone roj hmab, uas yog cuam tshuam los ntawm yam xws li
intermolecular rog, kev hloov pauv lossis cuam tshuam hauv cov qauv hauv lub network, thiab kev hloov pauv ntawm lub cev.
- Qhov qis dua qhov compression deformation tus nqi, qhov zoo dua qhov resilience thiab qhov muaj zog tiv thaiv deformation ntawm cov khoom.
