1. Roj thiab tshuaj tiv thaiv
General -lub hom phiaj cov khoom siv roj hmab silicone muaj cov roj nruab nrab thiab hnyav hnyav. Qhov℃ntawm qhov kev tiv thaiv no feem ntau yog nyob ntawm hom raw silicone roj hmab, hom thiab tus nqi ntawm cov muab tub lim, hom additives, thiab crosslinking ceev. Thaum cov khoom siv roj hmab silicone tau muab tso rau hauv cov kuab tshuaj organic polar, lawv cov ntim yuav nce 10% -15%. (ASTM...) Immersion nyob rau hauv No. 1 thiab No. 3 roj ntawm 150℃rau 70 teev ua rau expansion ntawm 10% thiab 45% raws, thaum expansion nyob rau hauv non{13}}polar solvents thiab roj roj mus txog 150% -200%. Txawm li cas los xij, qhov kev nthuav dav rov qab mus rau nws lub xeev qub tom qab hnyav evaporation nrog qhov cuam tshuam tsawg kawg rau nws lub cev. Cov khoom siv roj hmab silicone nthuav tawm cov roj qis hauv chav sov piv rau cov roj hmab ntuj thiab chloroprene roj hmab; Txawm li cas los xij, siab dua 100 degree, lawv cov roj kuj tau zoo dua. Cov khoom siv roj hmab silicone tau pom tias muaj kev tiv thaiv zoo tiv thaiv tsiaj thiab zaub roj uas tuaj yeem yaj cov roj hmab organic. Cov khoom siv roj hmab silicone tau tiv taus rau dilute acid thiab alkali daws, tab sis depolymerization thiab decomposition tshwm sim nyob rau hauv muaj zog acid thiab alkali tej yam kev mob. Qhia CF3CH2CH2- pab pawg rau hauv cov khoom siv roj hmab silicone ua tau zoo tuaj yeem txhim kho lawv cov roj thiab hnyav ua haujlwm; Txawm li cas los xij, kev nthuav dav hauv cov kuab tshuaj polar xws li acetone tseem muaj siab.
2. Dej Vapor Resistance
Cov khoom siv roj hmab silicone muaj qhov ua tau zoo heev rau qis -siab dej vapor (hauv qab 130℃). Lub sijhawm ntev immersion nyob rau hauv dej sov thiab boiling dej yuav ua rau ib tug ntim ntawm tsawg tshaj li 1%, nrog rau tsawg heev cuam tshuam rau lawv txhua yam thiab hluav taws xob zog. Txawm li cas los xij, dej vapor siab tshaj 140℃yooj yim ua rau Si-O-Si cov saw tseem ceeb tawg, ua rau txo qis hauv lub cev thiab txhua yam khoom ntawm cov khoom siv roj hmab silicone. Cov dej vapor tsis kam ntawm cov khoom siv roj hmab silicone muaj feem xyuam rau hom thiab tus nqi ntawm cov khoom siv siv, qhov sib txuas ntawm qhov ntom ntom, thiab hom vulcanizing tus neeg sawv cev.
3. Thermal Expansion, Thermal Conductivity, Tshwj xeeb Thaum tshav kub kub muaj peev xwm, thiab nplaim retardancy
Lub coefficient ntawm thermal expansion ntawm silicone roj hmab cov khoom yog ntau dua li ntawm cov organic rubbers thiab feem ntau yog nyob ntawm tus nqi ntawm cov muab tub lim siv; uas yog, qhov siab dua qhov txheeb ze ntawm cov khoom siv roj hmab silicone, qhov qis dua nws qhov nthuav dav. Tus nqi qis ntawm cov khoom siv roj hmab silicone feem ntau txawv ntawm (2-4) × 10⁻⁴ / K, uas yog 2.0-2.5 npaug ntawm cov roj hmab organic, lossis 20 npaug ntawm cov hlau. Cov thermal conductivity ntawm cov khoom siv roj hmab silicone yog 0.20-0.30 W / (m·K), ob zaug ntawm cov roj hmab organic, nrog cov qib tshwj xeeb tshaj 1.2 W / m·K. Vim yog lub thermal conductivity ntawm silicone roj hmab, qhov kub thiab txias sab hauv yog nce sai heev thaum lub sij hawm vulcanization, yog li ceev cov txheej txheem vulcanization los yog txo lub sij hawm vulcanization. Ntxiv cov khoom siv thermally xws li Al₂O₃, BN, MgO, thiab Ag rau cov khoom siv roj hmab silicone tuaj yeem ua kom cov thermal conductivity rau 2.0-14 W / (m·K).
