Qhov no yog thawj txoj hauv kev ntawm kev faib cov phenolic resins thiab cov txheej txheem ntau tshaj plaws rau kev paub qhov txawv ntawm cov ntawv thov kev lag luam.
Thermoplastic Phenolic Resins (Novolac / Linear Phenolic Resins)
- Synthesis tej yam kev mob: Acid catalytic ib puag ncig; molar ratio ntawm formaldehyde rau phenol yog tsawg dua 1 (feem ntau 0.8-0.9).
- Cov yam ntxwv ntawm tus yam ntxwv: Linear molecular qauv; tsis muaj active methylol pawg; softens thiab melts thaum cua sov.
- Kev Kho Kom Zoo: Yuav tsum tau ntxiv cov tshuaj tua kab mob (xws li hexamethylenetetramine) txhawm rau hla- txuas thiab kho thaum cua sov.
- Daim ntawv thov: Bakelite molding compounds, sib tsoo log binders, cob -coated xuab zeb binders rau casting, thiab lwm yam.
Thermosetting Phenolic Resins (Resole / A-theem Phenolic Resins)
- Synthesis tej yam kev mob: Alkaline catalytic ib puag ncig; molar piv ntawm formaldehyde rau phenol yog ntau dua 1 (feem ntau 1.2-1.5).
- Cov yam ntxwv ntawm tus yam ntxwv: Molecular chains feature active methylol pawg ntawm qhov kawg; muaj peev xwm ntawm tus kheej -kho ntawm tshav kub los ua ib tug peb -seem network qauv.
- Cov theem kho: Muab faib rau theem A (soluble thiab fusible), Theem B (ib nrab hla- txuas), thiab theem C (kho tag nrho; insoluble thiab infusible).
- Daim ntawv thov raug: Binders rau cov ntaub ntawv refractory, nplaum rau laminates, impregnating resins rau cov ntaub ntawv rwb thaiv tsev, thiab lwm yam.
Kev faib tawm los ntawm Cov Khoom Siv
- Khoom Phenolic Resins: Feem ntau hauv pob lossis hmoov daim ntawv; muab kev ruaj ntseg zoo thiab yooj yim ntawm lub sijhawm ntev - khaws cia thiab thauj; feem ntau siv hauv molding tebchaw thiab tsim cov cuab yeej abrasive.
- Cov kua Phenolic Resins: Feem ntau qis - kua viscosity los yog cawv- raws li kev daws teeb meem; yooj yim siv; tuaj yeem siv ncaj qha li impregnating agents, coatings, lossis adhesives.