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Sechinhu chinosanganiswa,unsaturated polyester resinyakashandiswa zvakanaka mukugadzira, girazi fiber yakasimbiswa mapurasitiki, dombo rekugadzira, mabasa emaoko, uye mamwe minda.Nekudaro, iyo ruvara rweyero yeunsaturated resins yagara iri dambudziko kune vanogadzira.Maererano nenyanzvi, zvinowanzokonzera yellowing ye unsaturated resins zvinosanganisira zvinotevera:

1. Munguva ye esterification synthesis process ye unsaturated resin, nekuda kwekuchembera kweyero kunokonzerwa nekupisa kwakanyanya, general esterification tembiricha ye unsaturated resin iri 180 ~ 220 ° kana kutokwira, pakupisa uku resin iri nyore kushanduka yero nekuda. kukwegura kwekupisa, kukanganisa kutaridzika kwezvigadzirwa zve resin.

2. Kutsvuka kunokonzerwa nekubuda kweresin kuultraviolet mwaranzi kunonyanya kukonzerwa nekuvapo kwebenzene rings muresin (kusanganisira aromatic dibasic acids/anhydrides uye benzene rings inounzwa nestyrene), zvinogona kunge zvichikonzerwa nekupisa kwekupisa kweanonhuwirira. zvinosanganiswa pakupisa kwakanyanya.Kushatisa, kunowanzoitika kune zvemagetsi shanduko, zvichiita kuti resin yero.

3. Mukugadzira resin kugadzirwa, iyo yakasvibirira inoratidzwa kune oxygen nekuda kwekusagadzikana kwekuisa chisimbiso kwechishandiso.Iyo molecular chain ye general unsaturated polyester haina chete ester mapoka, meridian mapoka, uye mapoka eantelope, asiwo mabhandi maviri uye zvindori zvinonhuhwirira.Iyo inosangana nekupisa kweiyo oxidative degradation, uye kuita kuri pachena ndekwekuti ruvara rwe resin rwunoshanduka yero.

4. Mhedzisiro yezvinowedzera zvakadai se antioxidants, polymerization inhibitors, kuporesa vamiririri, etc. Amine antioxidants inoshandurwa nyore nyore kuva nitroxide yakasununguka radicals kuti iite ruvara rwechigadzirwa.Inowanzo shandiswa polymerization inhibitors, senge hydroquinone, ndeyeOxidation mumaquinone pamberi pequinones, iyo pachayo ine ruvara, zvichikanganisa ruvara rweresin.Vamwe vagadziri vemishonga yekurapa vachiri kushandisa acyl peroxide-tertiary amine masisitimu uye ketone peroxide simbi sipo masisitimu.Ruvara, nyore-ku-ruvara resin.

Ehezve, pane zvimwe zvikonzero zvinoita kuti resin iite yero.Kazhinji kutaura, kupisa kweokisijeni uye ultraviolet mwaranzi ndizvo zvikonzero zvikuru zvekutsvuka.Saturated dibasic acid (kana acid anhydride) inoshandiswa pachinzvimbo chekunhuhwirira dibasic acid (kana acid anhydride), kunyangwe ichigona kushandiswa mune imwe nhanho, ruvara rweresin runogona kuitwa kureruka, asi tichifunga nezvezvinhu zvakasiyana senge resin kuita uye mutengo, nzira iyi haina kunaka.

Maererano nenyanzvi, kunze kwekuzadza gasi inert mukugadzira uye kuchengetedza nzira yekudzivirira kusangana neokisijeni zvakanyanya sezvinobvira, imwe nzira inoshanda ndeyekuwedzera antioxidants uye ultraviolet absorbers, iyo inogona kunyatso kudzivirira yellowing yepolyester yakanonoka.Nyanzvi-inokurudzirwa anti-yellowing mhinduro dzeunsaturated resins ndeidzi:

MaAntioxidants asina maamine anosarudzwa, uye ekutanga uye anobatsira antioxidants anoshandiswa musanganiswa.Iwo ekutanga antioxidants anowanzo kuvharirwa phenols, anogona kutora peroxide mahara radicals;iyo anobatsira antioxidants iphosphites, iyo Ichiri kuora hydroperoxide, inogona zvakare chelate simbi ions kudzivirira resin kubva kune oxidative discoloration.Kana iwe uchida kuwedzera kuvandudza kuyero kuramba uye kuramba kwemamiriro ekunze, zvinokurudzirwa kuwedzera UV absorber.Kuwedzera UV absorber inogona kunyatso kuvharidzira iyo yellowing phenomenon ye polymer zvinhu pasi pechiito che ultraviolet rays, uye inopa yakanakisa dziviriro kune chigadzirwa, zvinobudirira kudzivirira Kuderedzwa kwegloss, chizvarwa chekutsemuka, bubbles, uye delamination inogona kuvandudza zvakanyanya kupikisa kwemamiriro ekunze. yechigadzirwa, uye ine yakanaka synergistic mhedzisiro kana ichishandiswa pamwe chete nema antioxidants.Ehe, kushandiswa kwemaoxidants uye maAbsorbing eUV haagone kugadzirisa dambudziko rekuyero, asi mukati meimwe nhanho, inogona kunyatso kudzivirira oxidative yellowing yezvigadzirwa zvepolyester zvisina unsaturated, kuchengetedza chigadzirwa chewatercolor pachena, uye kuvandudza kunaka kwechigadzirwa.giredhi.

Yeduunsaturated polyester resinsanowanikwa mumhando dzakasiyana-siyana, pamwe neasina-yellowing resin, sezvinotevera:

Isu tinogadzirawofiberglass yakananga roving,fiberglass mats, fiberglass mesh, uyefiberglass yakarukwa roving.

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