Shin Polycarbonate ya daina zarar UV? Kwatanta da alhali

Fahimtar Yanzu Na Kewayon UV Na Polycarbonate Da Kudaden Tayi

Polycarbonate (PC) yana ba da kewayon UV ta hanyar tsakurten sayenshin sa. Zarar aromatic a cikin shayuyensa suna kare kewayon UV din zanan 320 nm, sun dauke labaran 99% na UVB da labarin 95% na kewayon UVA—yana farfaru da yawa daga cikin aljarumi domin ba abubuwan da ba’a kara kewaya ba a gaske a zaman lafiyar kewayon UV

Tsakurta Na Sayenshi Da Kewayon Tsakiya Na UVA/UVB

Furarorin karbonet da zarar binzena a cikin PC suna yi wazifa ne mai amfani da kwayoyin UV masu mahimmanci. Wannan amfani yana faruwa a karkashin talabijirga mai mahimmanci:

• Kashe kyau ta haguwa (280–315 nm)
• Karba bahalun UVA (315–400 nm)
  Hakanan shafukan 1 mm na gadi suna ba da kansu kai tsaye, sai dai PC ya zama maimakon gaske don amfani da ke da kwayo idan baa da abubuwan kara.

Mene ne saboda Polycarbonate ba tare da garba ta daki? Daurar Photooxidation

Kada rayuwan UV su dawo da polycarbonate mai ammauna, suna fara tsarin da aka kira photooxidation. Abin da ya kamata a sarari yanzu ita ce kyau a matsayin takamaiman kayan kimia. Alkarfin rayuwannan sun kawo haɓakar hulun halitta a cikin abubuwa, sune kirkirar karamar wadansu kiyama masu lafiya da aka kira free radicals. Wadannan radicals sun ci gaba su tafi da oksijin daga sama da ke gaskiya. Mai karancewa? Tsarin kiyaye kiyaye da yawa wanda ya kawo zuwa waɗannan batutuwa. Farko shine chain scission inda polymer chains mai tsokace sun fara haɓaka. Daga nan shine effects na yellowing yayin da halayya sababbin haɓakar hulun halitta bayyane tsakanin kayan kimia. Kuma akhirin shi shine sauya yake zangan kansa taƙaitaccen gyare-gyare. Lokacin da ke tsaye wasu shekara kawai a sama, PC mai adalci zai iya kwatanta karshen karƙashinsa ta hanyar mitne yayin da ke samun nura mai aljini da muka sani duk. Don haka masoyin yin buƙatar gedan cin ammauni idan kayan kansu za su dauki a sama.

Ƙara Tame: Gwaji da Hanyoyin Faburka

Takaitaccen Co-Extrusion, Gwajin Dandalin, da Kewayon UV-Stabilizer

Akwayo hanyoyin uku yana kara tushen kwari na UV a cikin polycarbonate, kowanne yana da abubuwan mai sauƙi da iyakar ta:

• Co-extrusion yana nuna tsarin gwaji mai dake kwari (masu amfani da acrylic ko fluoropolymer) a lokacin extrusion. Wannan hanyar haɗin ta gwajin kwari na UV biyu da 99% kwari na UV yayin kuɓi girman fuskoki da kuma yana maimakon don gwaji na gida wacce ke buƙatar girman shekaru manya. Amma wailah, yana buƙatar wasu kayayyakin ingantattun, zai sa damar faburka ya ƙarewa ne ta 15–25%.
• Alkawari Na Suhu , kamar silicone hardcoats, ana nuna su bayan faburka ta hanyar spray ko takaitawa. Suna ba da alhadin iya canzawa ga abubuwan girman siffa da kuma abokin cin hannun hannu, amma suna kurudan daga cikin rashin hannu ko ruwan sama—masu amfani suna buƙatar sake nuna su a cikin shekaru 5–7 a wuraren da ke tafiya kwari.
• Kewayon gwajin stabila yana ƙara abubuwan da suka haɗa da HALS (Hindered Amine Light Stabilizers) a cikin taita na polymer. Yana tabbatarwa kariyar kariyar a cikin kayan ƙasa—dubi don kayan mota da suka shiga—amintadu koda yaushe da suka fiye da 3% suna iya zinƙar karfafa ko haɓakar albarka.

Co-extrusion tana fara a cikin aikace-aikacen na waje; kayan ƙasa suna tsayawa kusurwar kayayyaki da kaiwa; kuma magana ita ce ta yi inganci a cikin aikace-aikacen da aka hada, suna da kankara. Wannan kowane hanyar ta kawo ingancin ƙarfin 10–20 shekara dibu da polycarbonate da ba a yi masa gudunmawa ba ta hanyar kawar da photooxidation.

Zabin Kama da UV: Hanyoyin da Kunsomin Al'adu

Zabin Zaman Lahen Lahen: Sauyan Shekara da Zaman Lahen

Karin magana na ruwa wanda ya samuwa daidai bisa yawa zasu iya hada gargadi mai tsawon ƙarshen karni zuwa sakamako. Wannan karin magana a cikin kambar fasaɗo wanda mafuta na UV ta imitate rayuwar rana, kamar hanyar ruwa wanda maimakon su suna sani. Akwai ma'auni gina al'ada kamar ASTM G154 da ISO 4892-3 wanda ke bayyana wasu nau'ikan iluminatiyar UV da girman ruwa wanda dole ne a amfani da su a lokacin karin magana. Duk da abubuwan da aka yi misali kamar karin magana na 1,000 sa’a, wanda zai dace da nan 2 zuwa 5 shekara na ingantacciyar rayuwa a waje, to amma wannan yana canzawa bisa tsin kanshewar wurin da ke tafi. Wannan nau'in karin magana yana ba da ilimin masoyeƙi kafin sayayyen su fito kan sadarwa waɗanda za su tafi mataki na iluminatiyar UV lokacin da yausi.

Muhimmancin Ma'anaddun Iyaka: Canjin Launi na ΔE, Kama'a na Taushe, da Tensile Retention

Uku ma'anaddun iyaka ke nuna iluminatiyar UV:

• δE (Delta E) : Yana na'urar canjin launi ta hanyar spectrophotometry; darajar da suka fi 2.0 yana nuna zurfi mai zuwa.
• Kama'a na Taushe : Ya kara gargadi na reflectivity na surface; polycarbonate mai ƙarin UV ya bada >85% gloss bayan 5 shekaru daidai damar shiga.
• Daidaiton tafarnin tafarar : Muhimmun don tsaro na tsari; maugurorin sadarwa suna buƙe >70% daidaiton tafarar bayan gwajin aiki.

Wadannan ma'auni suka haɗa suke nuna in abubuwan da ke wakilci UV sun dace da hankalin durbi don amfani a waje.

Furodan Polycarbonate Mai Wakiltar UV a Amfani A Waje

Durability Mai Tsawon Shekara, Anti-Yellowing, da Performans a cikin Glazing, Roofing, da Signage

Polycarbonate mai tsabo UV yana dauke da lokaci sosai a waje saboda ya tafiye photooxidation, wanda ke nufin abin da ke sauya dukkanin kayayyaki su karene over time. Sauran teknoloji na yau na haɗa wasu layer na co-extruded da additives na musammar da ke stop more than 99% of harmful UV rays from getting through. Tambayoyin ilimi suna nuna waɗannan kayayyaki suna iya kama da kama su kama da zaman kansu a cikin shekara goma zuwa gomani sha biyu, ko da suka shahara hali na harshe. Abin da ke muhimmiyar mahimmanci ga masu amfani guda duk shine yadda wannan tsabo ke kare ne harma ta canzawa zuwa mai launin buro. Bayan samun a waje a cikin shekara maha, canje-canjin launi yana zama gabata dari 3 a cikin scale na Delta E, don haka kayayyaki yana nuna kamar yaya mai zurfi da kamar yaya mai kyau kamar sabuwar, wanda ke muhimmiyar mahimmanci a masu amfani inda nunaɓar jiki ke muhimmi.

Tusheen tasowa na kayayyaki—200× masu girma karfi karaga—yana hada da stabilita na UV don samar da alhaji a masu amfani mai mahimmanci:

• Glazing : Fanelin greenhouse da skylights suna kama da kama su kama da kama su kama da kuma ba za su kare ba ko za su haze
• Faburin Roof : Kwayoyin suna tafi da ruwa da karkashin cewa yayin dawo da infrared heat
• Nuna alama : Fakolan taruwa suna tafi da rashin fara despite direct sun exposure

Ta yin wuyar embrittlement da rashin launi, ana rage biyan gwamnati na polycarbonate mai tsabo UV ta hanyar 40% dibé kan wasu abubuwan da ba a tsabo su ne—wanda ya sa ya zama hanyar halitta mai kyau ga maƙirta masu son kwana.

Sashen Tambayoyi

Wace saboda polycarbonate ke karɓe UV radiation natural ba?
Polycarbonate ke karɓe UV radiation saboda tsarin sa na kimika, kamar alkaru mai nazarin da ke tsabo UV radiation bisa 320 nm.

Wace saboda ke haifar da samun wurin polycarbonate ba a riga shi ba?
Polycarbonate ba a riga shi ba ke barcin saboda photooxidation, inda UV rays su karɓe ke kashe ukuwon kimiya yayin dawo da kayayyakin, karkashi, da loss in tensile strength.

Mece ce co-extrusion, kuma yaya ke ƙara tsabo UV?
Co-extrusion ke bincike a sake nana layer mai tsabo UV bayan extrusion, kuma yake ƙara tsabo UV yayin dawo da sharhi mai kyau don samun wurin girma.

Yaushe ake magana da gwaji mai kyakkyawa?
Gwaji mai kyakkyawa yana amfani da faran mata (UV) da tsarin ruwa don kawo hali na tausayin mata a cikin makon, don kawo tabbatarwa cewa dukkan abubuwan da ke iya tafiyyata da alhakin mata.

Wanne ne mai amfani a cikin amfani da polycarbonate mai dabo na mata?
Polycarbonate mai dabo na mata yana da zurfi, ya tsaye da kuka, kuma ya kawo tsayin aiki, yana kawo kara karancewar kudaden kai, kuma ya inganta aikace-aikacen na waje.