Kev laus ntawm lub hnab tuj feem ntau yog tshwm sim los ntawm ultraviolet rays nyob rau hauv lub hnub ci, uas ua rau degradation ntawm polypropylene, thiaj li hais tias lub rub quab yuam ntawm lub hnab ntim txo, chalking, fading thiab lwm yam tshwm sim. Txawm hais tias tus nqi ntawm ib lub hnab tuj tsis siab, ib lub hnab tuj zoo tib yam tsuas yog ob peb lub kaum os yuan, tab sis cov ntaub ntawv nws nqa yog ntau txhiab lossis txawm tias 10,000 npaug ntawm tus nqi. Yog li ntawd, kev siv Jiangxi ton hnab yog ib qho teeb meem tseem ceeb heev. Yog tias lub hnab tuj tau siv sijhawm ntev, yuav muaj qhov sib txawv ntawm kev laus. Yog li dab tsi yog qhov laj thawj tseem ceeb rau kev laus ntawm lub hnab tuj? Puas muaj kev daws teeb meem?
Yog vim li cas
1. Cov kab hluav taws xob ultraviolet yog qhov laj thawj tseem ceeb, vim tias lub hnab ntim tau raug tshav ntuj ntau dua thaum khaws cia, kev thauj mus los thiab siv. Kev tawg ntawm cov saw hlau molecular hauv polypropylene, yog li lub hnab ntim tau pom tias muaj peev xwm tensile tsis muaj zog, thiab lwm yam. Ntxiv rau qhov no, qhov sib txawv ntawm qhov kub thiab av noo hauv zos yuav tsum tau xav txog.
2. Tus kheej-oxidation mechanism Cov pa oxygen molecules ntawm lub thawv yas yuav ua rau nws tus kheej oxidation, thiab nws tus kheej-oxidation yuav txo cov molecular hnyav ntawm cov yas, ua rau kev laus.
3. Photo-oxidation mechanism Lub photo-oxidation mechanism ntawm lub hnub ci, ib qho yog lub hnub ci ncaj qha, ncaj qha tshav ntuj; lwm yam yog indirect tshav ntuj, vim hais tias ntawm lub reflection ntawm dej vapor, hmoov av, 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, yooj yim degradable polymers.
Kev daws
1. Nws yog ib qho tsim nyog yuav tsum to taub tag nrho cov neeg siv khoom los tiv thaiv kev laus rau lub hnab ntim, xws li qhov chaw ntawm kev siv, lub sijhawm siv, thiab lwm yam. Qee cov neeg siv khoom yuav muab cov khoom siv dag zog nrawm nrawm rau lub sijhawm thiab tuav lub zog, thiab qee cov neeg siv khoom txawm hais tias qhov sib ntxiv ntawm UV additives Raws li cov neeg siv khoom xav tau, tsim cov kev daws teeb meem rau cov khoom.
2. Tsim cov qauv tsim. Vim kev laus ntawm cov khoom siv rov ua dua tshiab, cov saw hlau molecular tau tawg, cov khoom siv kho tshuab tau raug txo kom tsawg, thiab kev pabcuam lub neej tau luv luv. Txhawm rau daws qhov teeb meem kev laus ntawm lub hnab ntim, nws yog ib qho tsim nyog yuav tau ntxiv cov tshuaj tiv thaiv kev laus hauv ib qho kev faib ua feem.