Kev ua tau zoo thiab kev siv cov roj hmab fluorine
1. Taw qhia rau fluorine roj hmab:
Roj hmab molecules muaj fluorine atoms. Cov khoom CF muaj li ntawm fluorine atoms thiab carbon atoms siab heev. Nyob rau tib lub sijhawm, fluorine atoms muaj cov nyhuv adsorption zoo, uas txhim kho kev ua haujlwm ntawm CC daim ntawv cog lus hauv cov saw hlau fluorocarbon molecular thiab nce nrog kev nce qib ntawm fluorination. Ua kom zoo dua, fluorine atoms tuaj yeem tiv thaiv CC thawj daim ntawv cog lus kom ntseeg tau tias cov tshuaj inertness ntawm CC daim ntawv cog lus. Cov qauv molecular tshwj xeeb no ua rau cov roj hmab fluorine muaj cov cua kub zoo heev, tshuaj lom neeg ua haujlwm, hnyav ua haujlwm, fluorination tsis kam, nqus tsis kam, roj tsis kam, kev laus ua haujlwm thiab lwm yam khoom tshwj xeeb.
Hom fluororubber tseem ceeb yog hom 26, hom 246, thiab hom 23; tetrapropylene fluororubber, fluorosilicone roj hmab, hydroxynitroso fluororubber, fluorinated phosphazene roj hmab, thiab perfluoroether roj hmab.
2. Cov khoom tseem ceeb ntawm fluorine roj hmab
1. Kev ruaj ntseg tshuaj fluorine roj hmab muaj kev ruaj ntseg tshuaj lom neeg thiab muaj kev tshaj tawm zoo tshaj plaws ntawm txhua tus elastomers tam sim no. Hom 26 fluorine roj hmab yog resistant rau roj av-raws li roj, roj diester, silicone silicic acid roj, inorganic acids, thiab feem ntau organic solvents, tab sis tsis resistant rau low-molecular ketones, ethers, esters, amines, ammonia, Hydrofluoric acid, chlorosulfonic acid, phosphoric acid hydraulic roj. Hom 23 yog qhov tshwj xeeb tshaj plaws. Nws kuj muaj zog oxidizing inorganic acids xws li fuming nitric acid thiab concentrated sulfuric acid yog zoo dua li hom 26.
2. Zoo heev kub ua hauj
Qhov kub tsis kam ntawm fluorine roj hmab yog tib yam li cov roj hmab silicone, thiab nws tuaj yeem hais tau tias yog qhov zoo tshaj plaws ntawm cov elastomers tam sim no. 246-26-23
3. Zoo aging kuj
Nws muaj cov huab cua aging kuj zoo heev thiab ozone kuj.
4. Lub tshuab nqus tsev ua haujlwm zoo heev
Nws muaj lub tshuab nqus tsev zoo heev.
5. Cov khoom siv kho tshuab zoo heev
Nws muaj zoo heev lub cev thiab mechanical zog. Lub compression mus tas li deformation ntawm qhov kub thiab txias yog qhov loj, tab sis yog tias muab piv rau tib lub sijhawm, cov roj hmab nitrile thiab chloroprene roj hmab loj dua li hom 26 roj hmab.
6. Kev ua haujlwm hluav taws xob zoo
Hom 23 fluororubber muaj cov khoom hluav taws xob zoo dua thiab qis hygroscopicity dua li lwm cov elastomers, yog li nws tuaj yeem siv los ua cov khoom siv hluav taws xob zoo dua. Fluorine roj hmab feem ntau tsuas yog tsim rau siv nyob rau hauv qis zaus thiab tsis tshua muaj hluav taws xob. Qhov kub thiab txias muaj qhov cuam tshuam zoo rau nws cov khoom hluav taws xob. Thaum nws nce ntawm 24 degree mus rau 184 degree, nws cov rwb thaiv tsev tiv thaiv poob los ntawm 35, 000 zaug.
7. Me npau taws
fluorine roj hmab muaj cov roj solubility siab, tab sis nws qhov diffusion tus nqi kuj me me, yog li nws tag nrho breathability kuj me me. Raws li cov lus ceeb toom, kev ua pa ntawm hom 26 fluororubber rau oxygen, nitrogen, thiab carbon dioxide ntawm 30 degree yog sib npaug rau cov roj hmab butyl, thiab zoo dua li chloroprene roj hmab thiab roj hmab ntuj.
8. Kev ua haujlwm kub tsis zoo
Fluorine rubber has poor low-temperature performance, which is due to its own chemical structure. For example, the Tg of type 23-11 is >0 degree. Qhov ntsuas kub qis ntawm fluororubber siv tau yog feem ntau qhia los ntawm qhov kub thiab txias thiab compression txias coefficient. Cov mis ntawm cov roj hmab sib xyaw thiab cov duab ntawm cov khoom muaj kev cuam tshuam ntau dua rau lub brittleness kub.
9. Cov hluav taws xob tsis zoo
Cov hluav taws xob tiv thaiv ntawm fluorine roj hmab yog qhov tsis zoo ntawm cov elastomers. Hom 26 roj hmab qhia tau hais tias muaj kev sib txuas sib txuas tom qab hluav taws xob, thiab hom 23 qhia tau hais tias muaj kev sib tsoo.
10. Raws li ib yam ntawm cov roj hmab hluavtaws, fluororubber muaj cov tshuaj lom neeg zoo heev, roj tsis kam thiab kub tsis kam, thiab nws qhov kub thiab txias siv mus ntev tuaj yeem ncav cuag 200 degree. Cov qauv tshuaj ntawm fluorine roj hmab muaj cov yam ntxwv ntawm cov ntsiab lus fluorine siab, muaj zog CF daim ntawv cog lus, thiab tsis muaj cov ntawv cog lus unsaturated, yog li nws muaj qhov kub thiab txias tsis kam thiab cov roj zoo heev. Txij li thaum fluorine roj hmab hu ua FKM nyob rau hauv ASTM D1418, FKM yog siv los sawv cev fluorine roj hmab. Raws li SAE J200 / ASTM D2000 kev faib tawm ntawm cov roj hmab, fluorine roj hmab raug cais raws li "HK" cov khoom. Tus thawj fluororubber yog copolymer ntawm hexafluoropropylene thiab vinylidene fluoride. Nws tau tsim los ntawm DuPont hauv Tebchaws Meskas hauv xyoo 1957 thiab siv rau roj tank ntsaws ruaj ruaj, roj thiab roj ntsaws ruaj ruaj thiab hydraulic system seals hauv thaj chaw aerospace. fluorine roj hmab tau siv dav hauv kev lag luam. Siv raws li O-rings, U-rings, V-rings, Y-rings, gaskets thiab lwm yam ntaub ntawv ntawm static thiab dynamic seals. ib yam li lwm cov khoom siv hauv cov roj thiab cov tshuab sib kis.