Kungani ukumaka umgwaqo kuphenduka ophuzi? Indima ye-UV & resin isimo sezulu

Ukumaka uphawu umgwaqo ophuzi ngokuyinhloko kubangelwa ukucekelwa phansi kwe-UV futhi uhlele kabusha isimo sezulu, ukuyekethisa ukubonakala nokuphepha. Nakhu ukuthi bahlangana kanjani:

1. Ukulimala kwe-UV
Imisebe ye-Sunlight's Ultraviolet (UV) ibhidliza izibopho zamakhemikhali ezintweni zokumaka. Okokumaka kwe-thermoplastic, ama-UV experose axidizes axishins (E.G., C5 Petroleum Resin), akha ama-chromophores aphuzi. Ukumaka okumhlophe okunokuqukethwe okuphansi kwe-titanium dioxide (Tio₂) kulahlekelwe okumhlophe okumhlophe, njengezihlangu ze-tio₂ ngokumelene ne-UV kodwa kuncibilika ngokuhamba kwesikhathi.

2. Hlala kabusha isimo sezulu
Ama-thermoplastic resins athambisa amazinga okushisa aphezulu (180-20 ° C), asheshise i-oxidation. Ukushisa ngokweqile ngesikhathi sohlelo lokusebenza noma ukuvezwa kwelanga isikhathi eside kusheshisa ukuncipha kwe-resin, okuholela kuphuzi.
I-Aromatic TPU Remins (esetshenziswe kwezinye izimbobo) ithambekele ku-UV-eqedwa ophuzi ngenxa yezinhlaka ze-benzene ring, ngokungafani ne-aliphhatic TPU.
Isixazululo
Ngeza ama-UV Ablebers (E.G., I-Benzotriazole Compounds) ukuze ihleli, ivimbe imisebe engu-270-380NM ye-UV.
Sebenzisa ama-resins amsulwa aphezulu kanye ne-tio₂ eyanele (≥18%) ukuthuthukisa ukumelana kwe-UV.
Lawula izinga lokushisa lesicelo (180-200 ° C) ukuvikela ukonakala okushisayo.
Ngokubhekana ne-UV nokuqina kwe-resin, ukumaka komgwaqo kungagcina umbala kanye nokusebenza isikhathi eside.