Polyvinyl tshuaj dawb yog ib tug polymer khoom uas siv ib tug tshuaj atoms los hloov ib hydrogen atom nyob rau hauv polyethylene, thiab yog ib tug amorphous polymer muaj ib tug me me npaum li cas ntawm crystalline qauv. Tus qauv ntawm cov khoom no yog raws li nram no: [Chich 2. PVC yog ib tug linear polymer nrog lub taub hau-tus Tsov tus tw qauv ntawm VCM monomer. Cov pa roj carbon atoms cov txheej txheem ntawm nyob rau hauv ib tug sawtooth zoo, thiab tag nrho cov atoms yog kev cob cog rua ntawm σ bonds. Tag nrho cov carbon atoms yog SP3 hybrid.
Nyob rau hauv lub PVC molecule saw, yog ib tug luv luv thiab cov kev teeb tsa. Nrog rau cov thawj ntawm polymerization cov tshuaj tiv thaiv kub, lub regularity ntawm cov kev cai yog zoo tuaj. Nyob rau hauv lub macromolecular qauv ntawm polyvinyl tshuaj dawb, tus qauv ntawm lub taub hau, saw, muab ob npaug rau daim ntawv cog lus, allyl chloride thiab tert-tshuaj yog cov tsis ruaj tsis khov lug, uas ua rau lub tshav kub-tsis kam deformation thiab kev laus kuj tsis muaj zog. Tom qab ua piv txwv yuav tsum tau hla-txuas, nws yuav tshem tawm.
Ntoo khaub lig-linking yog muab faib ua tawg crosslinking thiab tshuaj crosslinking.
1. Tawg crosslinking. Kev siv ntawm high-zog rays, feem ntau cov electron rays generated los ntawm cov tawg los yog electron acceleration generated los ntawm ib tug cobalt 60 qhov twg los, mas yuav siv lub caij nyoog kawg no. Tus ntoo khaub lig-linking neeg sawv cev (ob los yog ntau tshaj carbon-carbon ob daim ntawv cog lus qauv monomers) no ces txaus siab. Tab sis lub lag luam yog heev yooj yim, cov khoom siv uas yuav tsum tau muaj.
2. Tshuaj ntoo khaub lig-linking. Ntoo khaub lig-linking twb tau siv Triazole diamine ntsev (FSH), thiab lub crosslinking mechanism twb tau pawg rau cov ua ke ntawm amine thiab sulfhydryl radicals nyob rau hauv lub nres ntawm carbon chloride ncov qaumteb qabteb bonds. Ntoo khaub lig-txuas cov khoom kuj mus ultraviolet, hnyav kuj, kub, tej yam toughness thiab lwm yam khoom yuav tsum comprehensively upgraded.