Cov ntaub ntawv txheej polyurethane feem ntau yuav daj vim yog lub teeb ultraviolet lossis cua sov ntev, cuam tshuam rau lawv qhov tsos thiab lub neej ua haujlwm. Los ntawm kev qhia UV-320 thiab 2-hydroxyethyl thiophosphate rau hauv cov saw hlau txuas ntawm polyurethane, polyurethane dej-raws li nonionic uas tiv taus daj zoo heev tau npaj thiab siv rau txheej tawv. Los ntawm kev sib txawv xim, kev ruaj khov, scanning electron microscope, X-ray spectrum thiab lwm yam kev sim, nws tau pom tias tag nrho cov xim sib txawv △E ntawm cov tawv kho nrog 50 qhov ntawm nonionic dej-raws li polyurethane nrog kev tiv taus daj zoo heev yog 2.9, qib hloov xim yog 1 qib, thiab tsuas muaj kev hloov xim me ntsis xwb. Ua ke nrog cov ntsuas kev ua tau zoo ntawm tawv tensile lub zog thiab hnav tsis kam, nws qhia tau hais tias polyurethane daj-resistant npaj tuaj yeem txhim kho qhov tiv taus daj ntawm tawv thaum tswj nws cov khoom siv kho tshuab thiab hnav tsis kam.

Raws li tib neeg lub neej tau zoo dua, tib neeg muaj kev xav tau ntau dua rau cov rooj zaum tawv, tsis yog tsuas yog xav kom lawv tsis muaj teeb meem rau tib neeg kev noj qab haus huv, tab sis kuj xav kom lawv zoo nkauj. Polyurethane ua los ntawm dej yog siv dav hauv cov tshuaj pleev tawv vim nws muaj kev nyab xeeb zoo heev thiab tsis muaj kuab paug, ci ntsa iab, thiab cov qauv amino methylidynephosphonate zoo ib yam li tawv. Txawm li cas los xij, polyurethane ua los ntawm dej feem ntau yuav daj thaum lub sijhawm ntev ntawm lub teeb ultraviolet lossis cua sov, cuam tshuam rau lub neej ua haujlwm ntawm cov khoom. Piv txwv li, ntau cov khoom siv polyurethane khau dawb feem ntau tshwm sim daj, lossis ntau dua lossis tsawg dua, yuav muaj daj thaum lub hnub ci. Yog li ntawd, nws yog qhov tseem ceeb kom kawm txog kev tiv thaiv kev daj ntawm polyurethane ua los ntawm dej.

Tam sim no muaj peb txoj hauv kev los txhim kho qhov kev tiv thaiv daj ntawm polyurethane: kho qhov sib piv ntawm cov ntu tawv thiab mos thiab hloov cov khoom siv raw los ntawm cov hauv paus chiv keeb, ntxiv cov organic additives thiab nanomaterials, thiab kev hloov kho cov qauv.

(a) Kev kho qhov sib piv ntawm cov ntu tawv thiab mos thiab hloov cov khoom siv raw tsuas yog daws tau qhov teeb meem ntawm polyurethane nws tus kheej uas yooj yim rau 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 qhov xav tau ntawm kev ua lag luam Los ntawm TG, DSC, kev tiv thaiv kev sib txhuam thiab kev sim tensile, nws tau pom tias cov khoom siv lub cev ntawm polyurethane uas tiv taus huab cua thiab tawv kho nrog polyurethane ntshiab yog sib xws, qhia tias polyurethane uas tiv taus huab cua tuaj yeem tswj tau cov khoom yooj yim ntawm tawv thaum txhim kho nws cov huab cua tiv taus.

(b) Kev ntxiv cov organic additives thiab nanomaterials kuj muaj teeb meem xws li cov nqi ntxiv ntau thiab kev sib xyaw lub cev tsis zoo nrog polyurethane, ua rau cov khoom siv kho tshuab polyurethane txo qis.

(c) Cov ntawv cog lus disulfide muaj zog rov qab ua haujlwm tau zoo, ua rau lawv lub zog ua haujlwm qis heev, thiab lawv tuaj yeem tawg thiab rov tsim dua ntau zaus. Vim yog qhov rov qab ua haujlwm tau zoo ntawm cov ntawv cog lus disulfide, cov ntawv cog lus no raug rhuav tshem tas li thiab rov tsim dua hauv qab lub teeb ultraviolet irradiation, hloov lub zog teeb ultraviolet mus rau hauv lub zog cua sov tso tawm. Qhov daj ntawm polyurethane yog tshwm sim los ntawm lub teeb ultraviolet irradiation, uas ua rau cov ntawv cog lus tshuaj lom neeg hauv cov ntaub ntawv polyurethane zoo siab thiab ua rau cov ntawv cog lus sib cais thiab kev hloov pauv rov qab, ua rau muaj kev hloov pauv ntawm cov qauv thiab daj ntawm polyurethane. Yog li ntawd, los ntawm kev qhia cov ntawv cog lus disulfide rau hauv cov dej-raws li polyurethane saw ntu, kev kho tus kheej thiab kev tiv thaiv daj ntawm polyurethane tau raug sim. Raws li GB / T 1766-2008 xeem, △E yog 4.68, thiab qib hloov xim yog qib 2, tab sis txij li nws siv tetraphenylene disulfide, uas muaj xim tshwj xeeb, nws tsis haum rau polyurethane tiv taus daj.

Cov khoom nqus teeb ultraviolet thiab disulfides tuaj yeem hloov cov teeb ultraviolet uas nqus tau mus rau hauv lub zog cua sov kom txo qhov cuam tshuam ntawm cov teeb ultraviolet rau ntawm cov qauv polyurethane. Los ntawm kev qhia cov khoom siv rov qab tau 2-hydroxyethyl disulfide rau hauv theem polyurethane synthesis expansion, nws tau qhia rau hauv cov qauv polyurethane, uas yog cov tshuaj disulfide uas muaj cov pab pawg hydroxyl uas yooj yim rau kev cuam tshuam nrog isocyanate. Tsis tas li ntawd, UV-320 ultraviolet absorber tau qhia los koom tes nrog kev txhim kho ntawm polyurethane qhov kev tiv thaiv daj. UV-320 uas muaj cov pab pawg hydroxyl, vim nws tus yam ntxwv ntawm kev yooj yim cuam tshuam nrog cov pab pawg isocyanate, kuj tuaj yeem qhia rau hauv cov saw polyurethane thiab siv rau hauv nruab nrab ntawm tawv kom txhim kho qhov kev tiv thaiv daj ntawm polyurethane.

Los ntawm kev sim qhov sib txawv ntawm xim, nws pom tau tias qhov tsis kam ntawm cov xim daj polyureth. Los ntawm TG, DSC, kev tiv thaiv kev sib txhuam thiab kev sim tensile, nws pom tau tias cov khoom siv lub cev ntawm cov polyurethane uas tiv taus huab cua thiab cov tawv uas kho nrog polyurethane ntshiab yog sib xws, qhia tias cov polyurethane uas tiv taus huab cua tuaj yeem tswj tau cov khoom yooj yim ntawm tawv thaum txhim kho nws cov huab cua tiv taus.