Thermal khoom ntawm roj hmab
Thermal conductivity: roj hmab yog ib tug tsis zoo conductor ntawm tshav kub, thiab nws thermal conductivity coefficient yog hais txog 2.2 ~ 6.28 W / m 2.0K thaum lub thickness yog 25 hli. Nws yog ib qho khoom siv hluav taws xob zoo heev. Yog tias cov roj hmab tau ua rau hauv lub xeev microporous lossis daim txhuam cev, nws cov hluav taws xob rwb thaiv tsev yuav raug txhim kho ntxiv, kom cov thermal conductivity yuav raug txo mus rau 0.4 ~ 2.0 watts. Txhua yam khoom siv roj hmab tuaj yeem tsim kom muaj cua sov vim tsis siv hysteresis, yog li cov cua kub dissipation yuav tsum tau them sai sai rau.
Thermal expansion: because there is a large free volume between rubber molecular chains, the internal rotation of its chain segments becomes easier when the temperature rises, which will make its volume larger. The linear expansion coefficient of rubber is about 20 times that of steel. This must be considered in the vulcanization model design of rubber products, because the linear size of rubber products will be 1.2~3.5% smaller than the model. For the same type of rubber, the hardness of the rubber compound and the content of raw rubber also have a greater impact on the shrinkage of the rubber compound. The shrinkage is inversely proportional to the hardness and is proportional to the rubber content. The order of shrinkage of various rubbers in theory is: fluororubber>silicone rubber>butyl rubber>nitrile rubber>neoprene>styrene butadiene rubber>ntuj roj hmab. Thaum cov khoom siv roj hmab siv los ntawm qhov kub thiab txias, tshwj xeeb yuav tsum tau them nyiaj rau kev cuam tshuam ntawm ntim ntim. Piv txwv li, cov roj foob yuav xau vim qhov shrinkage, thiab cov khoom siv roj hmab thiab cov hlau sib txuas yuav ua rau muaj kev ntxhov siab ntau dhau vim qhov shrinkage, ua rau kev puas tsuaj thaum ntxov.
