Lub hnab ntim khoom tso cai rau peb tuaj yeem ntsib ntau yam khoom hauv peb lub neej vim tias txhua yam khoom yuav tsum tau ntim yog tias nws xav muag. Yog li ntawd, tsis muaj teeb meem dab tsi ntawm cov khoom ntim, tom qab siv mus ntev, nws yooj yim rau hnub nyoog thiab tawg vim yog sab nraud thiab sab hauv. Tau kawg, qhov no txhais tau tias peb yuav tsum hloov lub ntim. Yog li ntawd, nws yog ib qho tseem ceeb heev los tiv thaiv lub hnab ntim ntawm kev laus. Ntau tus neeg tsis paub ntau txog cov ntsiab lus no. Yuav tiv thaiv lub hnab ntim li cas los ntawm kev laus.
1. Ultraviolet rays yog lub ntsiab yog vim li cas. Txij li thaum lub hnab ntim tau raug tshav ntuj tshaj plaws hauv kev khaws cia, kev thauj mus los, thiab kev siv, ultraviolet rays nyob rau hauv tshav ntuj muaj lub zog siab thiab tuaj yeem txhawb kev tsim cov dawb radicals thiab hydroxides, yog li ua rau kev tawg ntawm cov saw hlau molecular hauv polypropylene, yog li cov hnab ntim tau pom. tsis muaj zog tensile muaj peev xwm, thiab lwm yam. Tsis tas li ntawd, qhov sib txawv ntawm qhov kub thiab av noo hauv zos yuav tsum tau txiav txim siab.
2. Photooxidation mechanism. Lub photooxidation mechanism ntawm lub hnub ci muaj ob qhov chaw: ib qho, ncaj qha tshav ntuj, ncaj qha raug rau lub hnub; ob, indirect tshav ntuj, vim yog lub reflection ntawm dej vapor, plua plav, thiab lwm yam nyob rau hauv cov huab cua; ob lub ntsiab ntawm lub hnub ci muaj cov kab hluav taws xob infrared, uas yuav ua rau ntau yam oxidants thiab yooj yim degradation ntawm polymers. Tsis txhob kwv yees qhov cuam tshuam ntawm qhov no. Raws li lub sijhawm dhau mus, peb yuav pom tias kev laus ntawm cov khoom noj-qib ton hnab tau dhau los ua qhov hnyav dua.
