Tons ntawm lub hnab ua rau peb tuaj rau hauv kev sib cuag nrog ntau yam khoom hauv lub neej, vim tias txhua yam khoom xav muag nws yuav tsum tau ntim, yog li tsis muaj teeb meem dab tsi ntim cov ntaub ntawv, tom qab siv mus ntev, los ntawm cov laj thawj sab nraud thiab lawv tus kheej, Nws yog ib qho yooj yim kom pom kev laus thiab tawg, ntawm chav kawm, qhov no qhia tau hais tias peb yuav tsum hloov lub ntim tshiab. Yog li ntawd, nws yog ib qho tseem ceeb heev los tiv thaiv kev laus ntawm tons ntawm lub hnab, ntau tus neeg tsis to taub cov ntsiab lus no, yog li cia peb saib yuav ua li cas tiv thaiv kev laus ntawm tons ntawm hnab.
1. Ultraviolet lub teeb yog ib qho ntawm cov laj thawj tseem ceeb, vim tias lub hnab ntim khoom hauv kev khaws cia, kev thauj mus los, kev siv thiab lwm yam ntawm feem ntau raug rau lub hnub, lub teeb ultraviolet nyob rau hauv lub hnub muaj lub zog siab, tuaj yeem txhawb kev tsim cov dawb radicals thiab hydrogen. thiab cov pa oxygen sib txuas, yog li ua rau tawg ntawm cov saw hlau molecular hauv polypropylene, yog li lub hnab tau pom tias muaj peev xwm tensile tsis muaj zog. Ntxiv rau qhov no, muaj qhov sib txawv hauv zos hauv qhov kub thiab av noo los xav txog.
2. Photooxidation mechanism. Lub photooxidation mechanism ntawm lub hnub ci muaj ob qhov chaw: thawj, ncaj qha tshav ntuj, ncaj qha irradiation ntawm lub hnub; Qhov thib ob, lub hnub ci tsis ncaj, vim qhov kev xav ntawm dej vapor hauv huab cua, plua plav, thiab lwm yam .; Ob lub ntsiab ntawm lub hnub ci muaj cov kab hluav taws xob infrared, uas ua rau muaj ntau yam oxidants thiab yooj yim degrade polymers. Tsis txhob kwv yees qhov cuam tshuam ntawm qhov no, dhau sijhawm, peb yuav pom tias kev laus ntawm cov zaub mov qib tons ntawm lub hnab hnyav zuj zus.