xov xwm

Raws li cov khoom sib xyaw,unsaturated polyester cobtau zoo siv nyob rau hauv coatings, iav fiber reinforced plastics, dag pob zeb, handicrafts, thiab lwm yam teb. Txawm li cas los xij, xim yellowing ntawm unsaturated resins yeej ib txwm muaj teeb meem rau cov tuam ntxhab. Raws li cov kws tshaj lij, ib txwm ua rau yellowing ntawm unsaturated resins muaj xws li hauv qab no:

1. Thaum lub sij hawm esterification synthesis txheej txheem ntawm unsaturated resin, vim thermal aging yellowing tshwm sim los ntawm high kub, lub dav esterification kub ntawm unsaturated resin yog 180 ~ 220 ° los yog siab dua, nyob rau hauv qhov kub ntawm no resin yog ib qho yooj yim tig daj vim. rau thermal aging, cuam tshuam cov tsos ntawm resin khoom.

2. Lub yellowing tshwm sim los ntawm kev raug cov resin rau ultraviolet rays yog feem ntau yog tshwm sim los ntawm lub xub ntiag ntawm benzene rings nyob rau hauv resin (xws li aromatic dibasic acids / anhydrides thiab benzene rings qhia los ntawm styrene), uas tej zaum yuav yog vim lub thermal oxidation ntawm aromatic. cov khoom sib xyaw ntawm qhov kub thiab txias. Degradation, yog nquag hloov hluav taws xob, ua rau cov resin daj.

3. Nyob rau hauv cov txheej txheem ntawm resin ntau lawm, cov ntaub ntawv raw yog raug rau cov pa oxygen vim tsis zoo sealing kev ua tau zoo ntawm cov cuab yeej. Cov saw hlau molecular ntawm cov polyester tsis muaj saturated tsis tsuas yog ester pawg, meridian pawg, thiab antelope pawg, tab sis kuj muaj ob daim ntawv cog lus thiab cov nplhaib uas muaj ntxhiab. Nws undergoes thermal oxidative degradation, thiab qhov kev ua tau zoo yog tias cov xim ntawm cov resin hloov daj.

4. Kev cuam tshuam ntawm cov khoom ntxiv xws li antioxidants, polymerization inhibitors, curing agents, thiab lwm yam. Amine antioxidants tau yooj yim hloov dua siab tshiab rau hauv nitroxide dawb radicals rau xim cov khoom. Feem ntau siv polymerization inhibitors, xws li hydroquinone, yog Oxidation rau hauv quinones nyob rau hauv lub xub ntiag ntawm quinones, uas lawv tus kheej muaj xim, yog li cuam tshuam cov xim ntawm resin. Qee cov tuam ntxhab ntawm cov tshuaj tua kab mob tseem siv acyl peroxide-tertiary amine systems thiab ketone peroxide hlau xab npum tshuab. Xim, yooj yim-rau-xim resin.

Tau kawg, muaj lwm yam laj thawj uas ua rau cov resin tig daj. Feem ntau hais lus, thermal oxygen thiab ultraviolet rays yog qhov laj thawj tseem ceeb rau yellowing. Saturated dibasic acid (los yog acid anhydride) yog siv los hloov cov aromatic dibasic acid (los yog acid anhydride), txawm hais tias nws tuaj yeem siv rau qee qhov, cov xim ntawm cov resin tuaj yeem ua kom sib dua, tab sis xav txog ntau yam xws li kev ua haujlwm ntawm resin thiab tus nqi, txoj kev no tsis zoo tagnrho.

Raws li cov kws tshaj lij, ntxiv rau kev sau cov pa roj inert hauv kev tsim khoom thiab khaws cov txheej txheem los tiv thaiv kev sib cuag nrog oxygen ntau li ntau tau, ib txoj hauv kev zoo dua yog ntxiv cov tshuaj tua kab mob antioxidants thiab ultraviolet absorbers, uas tuaj yeem tiv thaiv kom tsis txhob yellowing ntawm polyester retarded. Cov kws tshaj lij pom zoo los tiv thaiv cov xim daj rau cov khoom siv tsis zoo yog:

Cov tshuaj tiv thaiv antioxidant uas tsis muaj amines raug xaiv, thiab cov tshuaj tiv thaiv kab mob tseem ceeb thiab cov tshuaj tiv thaiv kab mob yog siv ua ke. Thawj cov tshuaj antioxidants feem ntau yog hindered phenols, uas tuaj yeem ntes peroxide dawb radicals; Cov pab cuam antioxidants yog phosphites, uas Thaum decomposing hydroperoxide, nws tseem tuaj yeem chelate hlau ions los tiv thaiv cov resin los ntawm oxidative discoloration. Yog tias koj xav txhim kho qhov yellowing tsis kam thiab huab cua tsis kam, nws raug nquahu kom ntxiv UV absorber. Ntxiv rau UV absorber tuaj yeem cuam tshuam qhov tshwm sim yellowing ntawm cov ntaub ntawv polymer nyob rau hauv qhov kev txiav txim ntawm ultraviolet rays, thiab muab kev tiv thaiv zoo rau cov khoom, tiv thaiv kom tsis txhob gloss, tiam ntawm cov kab nrib pleb, npuas, thiab delamination tuaj yeem txhim kho huab cua tiv thaiv. ntawm cov khoom, thiab nws muaj ib tug zoo synergistic nyhuv thaum siv ua ke nrog antioxidants. Tau kawg, kev siv cov tshuaj tiv thaiv antioxidants thiab UV absorbers tsis tuaj yeem daws qhov teeb meem ntawm yellowing, tab sis nyob rau hauv ib tug tej yam ntau yam, nws tseem muaj peev xwm tiv thaiv oxidative yellowing ntawm unsaturated polyester cov khoom, khaws cov khoom watercolor pob tshab, thiab txhim kho cov khoom zoo. qib.

Pebunsaturated polyester resinsmuaj nyob rau hauv ntau yam qauv, raws li zoo raws li tsis-daj resins, raws li nram no:

Peb kuj tsimfiberglass direct roving,fiberglass mats, fiberglass mesh, thiabfiberglass woven roving.

Tiv tauj peb:

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