Monga zida zazikulu zopangira masks, nsalu zosungunuka zakhala zokwera mtengo kwambiri ku China, zikufika mpaka kumitambo. Mtengo wamsika wa high melt index polypropylene (PP), zopangira za nsalu zosungunuka, zakweranso kwambiri, ndipo makampani apakhomo a petrochemical ayambitsa kutembenuka kukhala zida zapamwamba za polypropylene.
Mwa njira, ziyenera kudziwidwa kuti zinthu zenizeni zosungunuka zimatha kukhala biodegradable. 2040 yomwe imagwiritsidwa ntchito kwambiri pamsika ndi zinthu wamba za PP, ndipo zida zenizeni za PP zosungunuka zonse zimasinthidwa. Panopa, makina ang'onoang'ono (zosinthidwa extruders) pa msika, ntchito mkulu fluidity meltblown zipangizo ndi wosakhazikika. Makina akamakula, amathanso kugwiritsa ntchito zida za PP zosungunuka kwambiri. Mavuto amtundu wa makina ang'onoang'ono amawerengera gawo lalikulu lazifukwa. Nsalu yosungunuka nthawi zonse imafuna kugwiritsa ntchito 1500 melt chala chapadera chosungunuka, ndikuwonjezerapo polar masterbatch ndi polar process treatment kuti apititse patsogolo kusefera bwino.
Lero, mkonzi walemba nkhani yokhudza mawonekedwe a magwiridwe antchito a zosinthidwaZida zosungunuka za PP, ndikuyembekeza kukhala zothandiza kwa aliyense. Ngati mukufuna kupanga nsalu zosungunuka zomwe zimakwaniritsa miyezo yapadziko lonse ya KN90, KN95, ndi KN99, muyenera kumvetsetsa zonse zomwe zachitika popanga, kuzindikira zomwe zasiyidwa, ndikuzipanganso. Choyamba, tiyeni tiyambe ndi kusungunula kuwombedwa zopangira.
Malo osungunuka kwambiri amatanthauza kusungunula zakuthupi za PP
Masks opanga sangachite popanda nsalu ya spunbond ndi nsalu yosungunuka, zonse zomwe ndi zida za PP zosungunuka pambuyo pakuwonongeka. Kukwera kwa index yosungunuka ya PP yomwe imagwiritsidwa ntchito popanga nsalu yosungunuka, ulusi wowomberedwa bwino kwambiri, komanso kusefera kwa nsalu yosungunukayo. PP yokhala ndi kulemera kochepa kwa maselo ndi kugawa kwapang'onopang'ono kwa maselo ndikosavuta kupanga ulusi wofanana bwino.
Zopangira zopangira S-wosanjikiza (nsalu ya spunbond) ya masks imakhala ndi index yosungunuka kwambiri PP yokhala ndi index yosungunuka pakati pa 35-40, pomwe zinthu zopangira M-layer (nsalu yosungunuka) ndi PP yosungunuka yokhala ndi index yosungunuka kwambiri (1500). Kupanga kwa mitundu iwiriyi ya PP yosungunuka kwambiri sikungasiyanitsidwe ndi chinthu chofunikira kwambiri, chomwe ndi organic peroxide degradation agent.
Chifukwa chochepa kwambiri chosungunuka cha PP wamba, kuyenda kwake mumkhalidwe wosungunuka kumakhala kocheperako, zomwe zimalepheretsa kugwiritsidwa ntchito kwake m'magawo ena. Powonjezera organic peroxides kuti asinthe polypropylene, ndondomeko yosungunuka ya PP ikhoza kuwonjezereka, kulemera kwake kwa maselo kumatha kuchepetsedwa, ndipo kugawa kwa ma molekyulu a PP kumatha kuchepetsedwa, zomwe zimapangitsa kuyenda bwino komanso kujambula kwakukulu. Chifukwa chake, PP yosinthidwa ndi kuwonongeka kwa organic peroxide itha kugwiritsidwa ntchito kwambiri pamakina opangira jakisoni wokhala ndi mipanda yopyapyala komanso minda yopanda nsalu.
Zambiri zowononga peroxide
Organic peroxides ndi mankhwala owopsa a Gulu 5.2 omwe amafunikira kwambiri popanga, kusunga, kuyendetsa, ndi kugwiritsa ntchito. Pakadali pano, pali ma organic peroxides ochepa omwe amagwiritsidwa ntchito kwambiri pakuwonongeka kwa PP ku China. Nawa ochepa:
Diter butyl peroxide (DTBP)
Makhalidwe ake akuluakulu ndi awa:
Osavomerezedwa ndi FDA kuti awonjezere mu PP, osavomerezeka kuti apange chakudya chamagulu ndi zinthu zaukhondo.
Flash point ndi 6 ℃ yokha, ndipo imakhudzidwa kwambiri ndi magetsi osasunthika. 0.1MJ ya mphamvu ndi yokwanira kuyatsa nthunzi yake, kuti ikhale yosavuta kuwunikira ndi kuphulika kutentha; Ngakhale ndi chitetezo cha nayitrogeni, imatha kung'anima ndikuphulika m'malo opitilira 55 ℃.
Coefficient conductivity ndi yotsika kwambiri, zomwe zimapangitsa kuti zikhale zosavuta kusonkhanitsa ndalama panthawi yothamanga.
DTBP idasankhidwa ndi European Chemicals Agency (ECHA) mu 2010 ngati Level 3 inducing gene mutation substance ndipo sangavomerezedwe kuti igwiritsidwe ntchito ngati chowonjezera pakudya komanso kukhudzana mwachindunji ndi zinthu za anthu, chifukwa pali chiopsezo chachikulu choyambitsa biotoxicity.
2,5-dimethyl-2,5-bis (tert butylperoxy) hexane (yotchedwa "101″)
Wowononga uyu ndi m'modzi mwa ma peroxide omwe amagwiritsidwa ntchito kwambiri pakuwonongeka kwa PP. Chifukwa cha kutentha kwake koyenera komanso kuchuluka kwa mitundu ya okosijeni yokhazikika, komanso chivomerezo chake cha FDA ku United States ndi kuvomerezedwa ndi BfR ku Europe, ikadali chida chowonongera chomwe chimagwiritsidwa ntchito kwambiri pantchito iyi. Chifukwa cha kuchuluka kwa zinthu zosasunthika m'zinthu zowola, zomwe zimakhala zosakanikirana ndi fungo lamphamvu, zomwe zimapangitsa kuti PP ikhale yosungunuka kwambiri. Makamaka pazinthu zosungunuka zomwe zimagwiritsidwa ntchito popanga chigoba, kuwonjezera kwazinthu zambiri zowonongeka kungayambitse vuto lalikulu la fungo la nsalu zosungunuka.
3,6,9-Triethyl-3,6,9-Trimethyl-1,4,7-Triperoxynonane (yotchedwa "301″)
Poyerekeza ndi zida zina zowononga, 301 ili ndi magwiridwe antchito abwino kwambiri achitetezo komanso kuwononga bwino, komanso fungo lotsika kwambiri, zomwe zimapangitsa kuti ikhale imodzi mwazosankha zomwe zimakonda kunyozetsa PP. Ubwino wake ndi motere:
● Otetezeka
Kutentha kodziwola kofulumira ndi 110 ℃, ndipo kung'anima kwake kumakhalanso kokwera ngati 74 ℃, komwe kumatha kuletsa kuwonongeka ndi kuyatsa kwa zinthu zowononga panthawi yodyetsa. Ndi mankhwala otetezeka kwambiri a peroxide pakati pa zinthu zodziwika zowononga.
● Yothandiza kwambiri
Chifukwa cha kukhalapo kwa zomangira zitatu za peroxide mu molekyulu, kuwonjezera kwa gawo lomwelo la mitundu yotakata ya okosijeni kungapereke ma radicals aulere, ndikuwongolera bwino kuwonongeka.
Kununkhira kochepa
Poyerekeza ndi "Double 25", mankhwala osakhazikika omwe amapangidwa ndi kuwonongeka kwake ndi gawo limodzi mwa magawo khumi a zinthu zina, ndipo mitundu yazinthu zosasunthika zimakhala ndi fungo lochepa la esters, popanda mankhwala osokoneza bongo. chiopsezo chotsitsa zinthu za PP panthawi yosungira ndi kunyamula, potero kuwongolera chitetezo.
Ngakhale kuti DTBP siinavomerezedwenso ngati wothandizira zowonongeka kwa PP yosinthidwa, palinso ena opanga pakhomo omwe amagwiritsa ntchito DTBP monga wothandizira zowonongeka kuti apange PP yosungunuka kwambiri, yomwe imayambitsa ngozi zambiri zachitetezo pakupanga ndi madera ogwiritsira ntchito. Zotsatira zake zimakhalanso ndi vuto lalikulu la fungo, ndipo pali chiopsezo chachikulu cha kukanidwa kapena kulephera kuyesedwa pamene akutumizidwa kumsika wapadziko lonse.
Dongguan Liansheng Non Woven Technology Co., Ltd.idakhazikitsidwa mu Meyi 2020. Ndi bizinesi yayikulu yopanda nsalu yopanga nsalu kuphatikiza kafukufuku ndi chitukuko, kupanga, ndi malonda. Itha kupanga mitundu yosiyanasiyana ya nsalu za PP spunbond zosalukidwa ndi m'lifupi mwake osakwana 3.2 metres kuchokera ku 9 magalamu mpaka 300 magalamu.
Nthawi yotumiza: Nov-09-2024