Dab tsi yog thermosetting resin?
Thermosetting resin los yog thermosetting resin yog ib qho polymer uas kho tau los yog zoo li lub cev tawv siv txoj kev kho xws li cua sov lossis hluav taws xob.Cov txheej txheem curing yog txheej txheem irreversible.Nws crosslinks ib lub network polymer los ntawm covalent tshuaj daim ntawv cog lus.
Tom qab cua sov, cov khoom siv thermosetting tseem muaj zog kom txog thaum qhov kub nce mus txog qhov kub ntawm qhov nws pib degrade.Cov txheej txheem no yog qhov txawv ntawm cov yas thermoplastic.Qee qhov piv txwv ntawm thermosetting resins yog:
Phenolic cob
- Amino cob
- Polyester cob
- Silicone cob
- Epoxy cob, thiab
- Polyurethane cob
Ntawm lawv, epoxy resin lossis phenolic resin yog ib qho ntawm cov thermosetting resins feem ntau.Niaj hnub no, lawv tau siv dav hauv cov qauv thiab cov khoom siv tshwj xeeb sib xyaw.Vim lawv lub zog siab thiab nruj (vim lawv txoj kev sib txuas siab), lawv yuav luag tsim nyog rau txhua daim ntawv thov.
Dab tsi yog hom tseem ceeb ntawm epoxy resins siv hauv cov ntaub ntawv sib xyaw?
Peb hom tseem ceeb ntawm epoxy resins siv hauv cov khoom siv sib xyaw yog:
- Phenolic aldehyde glycidyl ether
- Cov tshuaj tsw qab glycidyl amine
- Cyclic aliphatic compounds
Dab tsi yog cov khoom tseem ceeb ntawm epoxy resin?
Peb tau teev tseg hauv qab no cov khoom tseem ceeb muab los ntawm epoxy resin.
- Siab zog
- Tsawg shrinkage tus nqi
- Nws muaj adhesion zoo rau ntau yam substrate
- Siv hluav taws xob rwb thaiv tsev zoo
- Chemical resistance thiab hnyav kuj, thiab
- Tus nqi qis thiab qis toxicity
Epoxy resins yog ib qho yooj yim los kho thiab sib haum nrog feem ntau cov substrates.Lawv yooj yim rau ntub qhov chaw thiab tshwj xeeb tshaj yog haum rau cov khoom siv sib xyaw.Epoxy resin kuj yog siv los hloov ntau yam polymers, xws li polyurethane los yog unsaturated polyester.Lawv txhim kho lawv lub cev thiab tshuaj lom neeg.Rau thermosetting epoxy resins:
- Lub zog tensile ntau yog los ntawm 90 txog 120MPa
- Qhov ntau ntawm tensile modulus yog 3100 txog 3800MPa
- Lub iav hloov pauv kub (Tg) ntau yog 150 txog 220 ° C
Epoxy resin muaj ob lub ntsiab drawbacks, uas yog nws brittleness thiab dej rhiab heev.
Post lub sij hawm: Jan-29-2024
