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Kodi mafuta abwino kwambiri a silicone ndi ati omwe sitikudziwa?

Zinthu zambiri m'moyo zimapangidwa kuchokera kuzinthu zopangidwa ndi mankhwala. Izi zikugwiritsa ntchito zabwino zawo kuti tigwiritse ntchito. Mafuta a silicone nthawi zambiri amatanthauza mankhwala opangidwa ndi polysiloxane omwe amakhala ndi madzi otentha. Nthawi zambiri imakhala yopanda utoto (kapena yonyezimira), yopanda fungo, yopanda poizoni, yosasinthasintha madzi, yosungunuka m'madzi, methanol, ethylene glycol, komanso yogwirizana ndi benzene. , Dimethyl ether, carbon tetrachloride kapena palafini amatha kusungunuka, osungunuka pang'ono mu acetone, dioxane, ethanol ndi butanol. Ndiroleni ndikuuzeni zabwino za mafuta a silicone.

Chimodzi. Kutentha kwabwino

Popeza unyolo waukulu wa polysiloxane molekyulu umapangidwa ndi -Si-O-Si- nsinga, uli ndi mawonekedwe ofanana ndi ma polima amadzimadzi, ndipo mphamvu yake yolimba ndiyokwera kwambiri, motero imakhala ndi kutentha kwabwino kwambiri.

Awiri. Kukhazikika kwa okosijeni wabwino komanso kukana nyengo

Atatu. kutchinjiriza kwabwino kwamagetsi

Mafuta a silicone amakhala ndi ma dielectric abwino, ndipo mawonekedwe ake amagetsi sasintha pang'ono pakusintha kwa kutentha komanso pafupipafupi. Nthawi zonse ma dielectric amachepetsa ndikutentha, koma kusintha ndikochepa. Mphamvu yamafuta a silicone ndiyotsika, ndipo imakulira ndikutentha, koma palibe lamulo losintha pafupipafupi. Kutalika kwa voliyumu kumachepa kutentha kukakwera.

Zinayi. hydrophobicity yabwino

Ngakhale unyolo waukulu wa   mafuta a silicone amapangidwa ndi polar bond Si-O, gulu lopanda polar alkyl lomwe lili pambaliyo limayang'ana panja, kuteteza ma molekyulu amadzi kuti asalowe mkati ndikusewera ma hydrophobic. Mavuto amkati amafuta a silicone kumadzi amakhala pafupifupi 42 dyne / cm. Pakufalikira pagalasi, chifukwa chamadzi obwezeretsa mafuta a silicone, mawonekedwe olumikizana ndi 103oC amapangidwa, omwe amafanana ndi sera ya parafini.

Asanu. coefficient yotentha ya viscosity ndi yaing'ono

Kutalika kwa mafuta a silicone ndikotsika, ndipo sikusintha pang'ono ndi kutentha, komwe kumakhudzana ndi kapangidwe ka helical yama molekyulu amafuta a silicone. Mafuta a silicone ali ndi mawonekedwe abwino kwambiri otentha pakati pamafuta osiyanasiyana amadzimadzi. Khalidwe la mafuta a silicone ndilofunika kwambiri kuzipangizo zonyamulira zida.

Zisanu ndi chimodzi. kuthamanga kwambiri

Chifukwa cha mawonekedwe am'magazi amafuta a silicone komanso kutalika kwakatikati mwa mamolekyulu, imatha kukanikiza kwambiri. Pogwiritsa ntchito mawonekedwe amafuta a silicone, amatha kugwiritsidwa ntchito ngati kasupe wamadzi. Poyerekeza ndi kasupe wamakina, voliyumu imatha kuchepetsedwa kwambiri.

Zisanu ndi ziwiri. otsika pamwamba mavuto

Kutsika kwapansipansi ndimikhalidwe yamafuta a silicone. Kutsika kwapansi kumatanthauza zochitika zapamwamba. Chifukwa chake, mafuta a silicone ali ndi zida zabwino kwambiri zotsutsana ndi thovu, kupatula kuzinthu zina, komanso mafuta.

Eyiti. yopanda poizoni, yopanda pake komanso yopanda thanzi

"Malinga ndi momwe thupi limaonera, ma polima a silicone ndi amodzi mwamankhwala osagwira ntchito omwe amadziwika. Simethicone ilowerera m'zinthu zamoyo ndipo siyimakanidwa ndi matupi anyama. Chifukwa chake, akhala akugwiritsidwa ntchito kwambiri m'madipatimenti monga opaleshoni ndi mankhwala amkati, mankhwala, chakudya ndi zodzoladzola.

Naini. mafuta abwino

Mafuta a silicone ali ndi zinthu zambiri zabwino monga mafuta othira mafuta, monga malo owala kwambiri, malo ozizira otsika, kukhazikika kwamatenthedwe, kusintha kocheperako pang'ono ndikutentha, kulibe dzimbiri lazitsulo, kulibe zotsatira zoyipa pa mphira, mapulasitiki, zokutira, makanema ojambula, ndi otsika mavuto padziko. Ndikosavuta kufalikira pamwamba pazitsulo ndi mawonekedwe ena. Pofuna kukonza mafuta osakanizika ndi zitsulo, mafuta owonjezera omwe amatha kusokonekera ndi mafuta a silicon amatha kuwonjezeredwa. Kuyambitsa gulu la chlorophenyl pamakina a siloxane kapena kusintha gulu la trifluoropropylmethyl kukhala gulu la dimethyl kumatha kukonza bwino mafuta a silicone.

Khumi. Katundu wa mankhwala

Mafuta a Silicone ndiosavomerezeka chifukwa kulumikizana kwa Si-C ndikokhazikika. Koma zowonjezera zowonjezera zimakhala zosavuta kuyanjana nazo, makamaka kutentha kwambiri. Mafuta a silicone amakhudzidwa kwambiri ndi mafuta a chlorine, makamaka mafuta a methyl silicone. Nthawi zina pamakhala zophulika. Mgwirizano wa Si-O umasweka mosavuta ndi maziko olimba kapena zidulo. Mafuta osakanikirana a sulfuric amachedwa msanga kutentha pang'ono, kuthyola unyolo wa siloxane ndikulumikiza nawo. Pankhaniyi, mafuta a silicone okhala ndi magulu ambiri a alkane ndi magulu a phenyl amakhazikika, koma asidi wa sulfuric acid amathyola mgwirizano wa benzene-silicon wamagulu a phenyl ndikumasula benzene.

 


Nthawi yamakalata: Aug-23-2021