Polyurethane txheej cov ntaub ntawv yog ua rau yellowing lub sij hawm vim lub sij hawm ntev raug rau ultraviolet lub teeb los yog tshav kub, cuam tshuam rau lawv cov tsos thiab kev pab cuam lub neej. Los ntawm kev qhia txog UV-320 thiab 2-hydroxyethyl thiophosphate rau hauv cov saw txuas ntxiv ntawm polyurethane, cov dej tsis muaj dej-raws li polyurethane uas muaj kev tiv thaiv zoo rau yellowing tau npaj thiab siv rau cov tawv txheej. Los ntawm cov xim sib txawv, kev ruaj ntseg, scanning electron microscope, X-ray spectrum thiab lwm yam kev ntsuam xyuas, nws tau pom tias tag nrho cov xim sib txawv △E ntawm cov tawv nqaij kho nrog 50 qhov chaw ntawm nonionic dej-raws li polyurethane nrog zoo heev tsis kam mus yellowing yog 2.9, cov xim hloov qib yog 1 qib, thiab tsuas muaj xim hloov me ntsis. Ua ke nrog cov cim qhia txog kev ua tau zoo ntawm tawv tensile lub zog thiab hnav tsis kam, nws qhia tau hais tias kev npaj yellowing-resistant polyurethane tuaj yeem txhim kho yellowing kuj ntawm tawv thaum tuav nws cov khoom siv kho mob thiab hnav tsis kam.

Raws li tib neeg txoj kev noj qab haus huv tau txhim kho, tib neeg muaj kev xav tau ntau dua rau cov rooj zaum tawv tawv, tsis tsuas yog xav kom lawv tsis muaj kev phom sij rau tib neeg kev noj qab haus huv, tab sis kuj xav kom lawv ua kom zoo nkauj. Dej-raws li polyurethane yog dav siv nyob rau hauv tawv txheej cov neeg sawv cev vim nws zoo heev kev nyab xeeb thiab tsis muaj kuab paug kev ua tau zoo, siab gloss, thiab amino methylidynephosphonate qauv zoo ib yam li cov tawv. Txawm li cas los xij, dej-raws li polyurethane ua rau yellowing nyob rau hauv lub sij hawm ntev ntawm ultraviolet lub teeb los yog tshav kub, cuam tshuam rau lub neej kev pab cuam ntawm cov khoom. Piv txwv li, ntau cov khau dawb polyurethane cov ntaub ntawv feem ntau tshwm daj, los yog ntau dua los yog tsawg dua, yuav muaj yellowing nyob rau hauv irradiation ntawm tshav ntuj. Yog li ntawd, nws yog ib qho tsim nyog los kawm txog kev tiv thaiv yellowing ntawm dej-raws li polyurethane.

Tam sim no muaj peb txoj hauv kev los txhim kho cov yellowing tsis kam ntawm polyurethane: kho qhov feem ntawm cov tawv thiab mos ntu thiab hloov cov ntaub ntawv raw los ntawm cov hauv paus hauv paus, ntxiv cov organic additives thiab nanomaterials, thiab kev hloov kho cov qauv.

(a) Kho qhov feem ntawm cov tawv thiab mos ntu thiab hloov cov ntaub ntawv raw tuaj yeem daws qhov teeb meem ntawm polyurethane nws tus kheej tuaj yeem ua daj, tab sis tsis tuaj yeem daws qhov cuam tshuam ntawm ib puag ncig sab nraud ntawm polyurethane thiab tsis tuaj yeem ua tau raws li kev ua lag luam los ntawm TG, DSC, abrasion resistance thiab tensile test, nws tau pom tias lub cev muaj zog ntawm kev npaj huab cua-resistant polyurethane thiab cov tawv nqaij zoo ib yam. polyurethane tuaj yeem tuav cov khoom tseem ceeb ntawm tawv thaum txhim kho nws cov huab cua tsis kam.

(b) Qhov sib ntxiv ntawm cov organic additives thiab nanomaterials kuj muaj teeb meem xws li ntau ntxiv thiab tsis zoo lub cev sib xyaw nrog polyurethane, uas ua rau txo qis hauv polyurethane mechanical zog.

(c) Disulfide bonds muaj zog dynamic reversibility, ua rau lawv lub zog ua kom qis heev, thiab lawv tuaj yeem tawg thiab rov tsim dua ntau zaus. Vim yog qhov hloov pauv tsis zoo ntawm cov nyiaj disulfide, cov ntawv cog lus no tau tawg tas li thiab rov tsim dua nyob rau hauv ultraviolet lub teeb irradiation, converting ultraviolet lub teeb zog rau hauv tshav kub tso tawm. Lub yellowing ntawm polyurethane yog tshwm sim los ntawm ultraviolet lub teeb irradiation, uas excites cov tshuaj bonds nyob rau hauv cov ntaub ntawv polyurethane thiab ua rau daim ntawv cog lus cleavage thiab reorganization tshwm sim, ua rau cov qauv kev hloov thiab yellowing ntawm polyurethane. Yog li ntawd, los ntawm kev qhia cov disulfide bonds rau hauv cov dej-raws li polyurethane saw ntu, kev kho tus kheej thiab yellowing kuj ua tau zoo ntawm polyurethane tau sim. Raws li GB / T 1766-2008 xeem, △E yog 4.68, thiab cov xim hloov qib yog qib 2, tab sis txij li thaum nws siv tetraphenylene disulfide, uas muaj ib co xim, nws tsis haum rau yellowing-resistant polyurethane.

Ultraviolet lub teeb absorbers thiab disulfides tuaj yeem hloov lub teeb absorbed ultraviolet mus rau lub zog hluav taws xob tso tawm kom txo tau cov hluav taws xob ultraviolet hluav taws xob ntawm cov qauv polyurethane. Los ntawm kev qhia cov dynamic reversible tshuaj 2-hydroxyethyl disulfide mus rau hauv lub polyurethane synthesis expansion theem, nws yog nkag mus rau hauv lub polyurethane qauv, uas yog ib tug disulfide compound uas muaj hydroxyl pawg uas yooj yim rau react nrog isocyanate. Tsis tas li ntawd, UV-320 ultraviolet absorber yog qhia los koom tes nrog kev txhim kho polyurethane's daj tsis kam. UV-320 muaj cov pab pawg hydroxyl, vim nws cov yam ntxwv ntawm kev yooj yim reacting nrog isocyanate pawg, kuj tuaj yeem nkag mus rau hauv cov saw hlau polyurethane thiab siv nyob rau hauv nruab nrab lub tsho tiv no ntawm tawv los txhim kho cov xim daj ntawm polyurethane.

Los ntawm kev kuaj xim sib txawv, nws tau pom tias cov xim daj tsis kam ntawm cov xim daj tsis kam polyureth Los ntawm TG, DSC, abrasion resistance thiab tensile test, nws tau pom tias cov khoom ntawm lub cev ntawm cov huab cua-resistant polyurethane thiab tawv kho nrog ntshiab polyurethane tau zoo ib yam, qhia tias huab cua-resistant polyurethane muaj peev xwm tswj tau cov yam ntxwv ntawm cov tawv nqaij thaum txhim kho huab cua tiv thaiv.