Epoxy Flame Retardant Adhesive: Dual Dziviriro Yekunamatira Kwakasimba uye Yakakwira Murazvo Retardancy.

 

Epoxy adhesives akasandura kugadzirwa nekuvaka kwazvino nekuda kwekugona kwawo kwechisungo, kuita zvakasiyana-siyana, uye kusimba. Yakatorwa kubva kuepoxy resins, aya anonamira mapolymers e thermosetting akaumbwa nekuita kwemapoka epoxide ane mishonga yekurapa, senge maamines kana anhydrides, zvichikonzera network yakabatana-yakabatana inopa kunamatira kwakasimba kune akawanda arranty e substrates anosanganisira simbi, mapurasitiki, macomposites, uye ceramics. Kushandiswa kwavo kwakapararira kunotora maindasitiri senge aerospace, mota, zvemagetsi, uye kuvaka, kwavanogonesa magadzirirwo akareruka, kuvimbika kwechimiro, uye maitiro egungano anoshanda. Nekudaro, chinodzikisira chakakosha chetsika epoxy adhesives ndiko kugona kwavo kupisa. Epoxy resins, inonyanya kuumbwa nekabhoni, hydrogen, uye okisijeni, inoratidza yakaderera inodzikamisa okisijeni index (LOI) yakatenderedza 19-20%, ichiita kuti ive nyore kupisa, kukurumidza kupararira kwemurazvo, uye kuburitswa kwehutsi hune muchetura uye madonhwe akanyunguduka panguva yekupisa. Izvi zvinounza njodzi dzakakura dzekuchengetedza mumashandisi akazarurwa kune njodzi dzemoto, senge zvinhu zvemagetsi, mukati mendege, uye zvekuvakisa.

Kuti vagadzirise izvi, vatsvakurudzi vakagadzira moto unodzorera epoxy adhesives anosanganisira additives kana reactive agents kuti awedzere kupisa moto pasina kukanganisa simba rekunamatira. Pfungwa ye "dziviriro mbiri" inoreva kuwirirana pakati pechakasimba mechanicha bonding uye high flame retadancy, inowanikwa kuburikidza neunyowani maumbirwo anoenzanisa zvivakwa izvi. Kufambira mberi kwazvino kunotarisa kune halogen-isina retardants, senge phosphorous-based compounds, boron derivatives, uye nanomaterials senge graphene, iyo inosimudzira kuumbwa kwechar uye kudzima zvakanyanya kudzima marimi. Semuyenzaniso, yakaderera-kurodha phosphorus modifiers inogona kuwana UL-94 V-0 ratings - chiyero chezvimisikidza zvinhu-zvine zvishoma zvinokanganisa kusimba uye kugera simba. Zviitiko izvi hazvienderane chete nemitemo yakasimba yekuchengetedza moto asiwo inopindirana nekuchengetedza kwezvakatipoteredza nekuderedza kuburitswa kwehupfu.

Ichi chinyorwa chinoongorora zvakakosha zve epoxy flame retardant adhesives, maitiro avo, mhando, mashandisirwo, matambudziko, uye tarisiro yeramangwana. Nekubatanidza tsvakiridzo yekucheka-kumucheto, inoratidza kuti zvinhu izvi zvinopa sei dziviriro mbiri, kuve nechokwadi chekuchengetedza uye kuita munzvimbo dzinodiwa. Shanduko yezvinonamira izvi inosimbisa shanduko yakanangana neakawanda-inoshanda zvinhu zvinosangana nezvinodiwa zviviri zvekunamatira uye kuramba moto, zvichigadzira nzira yezvitsva zvakachengeteka kumativi ese.

Zvinokosha zveEpoxy Adhesives

Epoxy adhesives anobva pane epoxy resins, kazhinji bisphenol A diglycidyl ether (DGEBA), iyo inopindirana nehardener kuita chimiro chakaoma, chakabatana. Kurapa kunosanganisira ring-kuvhura polymerization, uko epoxide mhete inovhurika uye inobatana nemaamine kana mamwe mapoka anoshanda, kugadzira matatu-dimensional network. Iyi network inopa yakanakisa mechaniki zvivakwa, zvinosanganisira yakakwira tensile simba (kazhinji inodarika makumi mashanu MPa), kuchinjika simba, uye kukanganisa kuramba. Adhesion maitiro anovimba nemakemikari bonding, mechanical interlocking, uye van der Waals masimba, achibvumira epoxies kuti abatanidze zvinhu zvakasiyana-siyana zvinobudirira. Semuyenzaniso, marapirwo epamusoro senge jecha kana silane coupling agents anowedzera kunyorova uye kusimba kwechiso, kuwana kusimba kwekugera kusvika ku10-15 MPa pasimbi sealuminium.

Mumagadzirirwo anonamira, mafirita akadai se silica kana mafibhi anowedzerwa kunatsiridza viscosity, thixotropy, uye thermal conductivity, nepo modifiers senge inoshanduka epoxies (semuenzaniso, diglycidyl phthalate) inoderedza brittleness uye inogonesa kurapa nekukurumidza pane tembiricha. Chidzidzo paDGEBA yakagadziridzwa ine 10 wt% diglycidyl phthalate yakaratidza kudzikiswa kwenguva yegel kusvika kumaminitsi makumi mashanu nemana uye kuwedzera kwesimba rekuwedzera kusvika ku44 MPa, nekusimudzirwa kwekudzikira kudzika kusvika -20°C. Uku kuchinjika kwakakosha kune maapplication anoda kukurumidza kusangana pasina kudziyisa.

Zvisinei, ma epoxies asina kuchinjwa anogona kupfuta, ane peak heat release rates (PHRR) pamusoro pe800 kW/m² mumakoni calorimetry bvunzo, zvichiita kuti kukurumidza kuora uye kugadzirwa kweutsi. Kuti uderedze izvi, zvinodzoreredza murazvo zvakabatanidzwa, asi hazvifanirwe kukanganisa kurapa kinetics kana kunamatira. Reactive retardants, kemikari yakasungirirwa mumatrix, inopa kuwirirana kuri nani pane zvinowedzera, kuchengetedza kunamatira uku uchiwedzera kuchengetedzwa kwemoto. Pakazere, izvo zvakakosha zvinosimbisa kudiwa kweakagadzirirwa maumbirwo anokwenenzvera kuyambuka-yekubatanidza density yemabhondi akasimba, akasimba.

 

Kupisa uye Kupisa kweEpoxy Resins

Kupisa kwe epoxy resins inzira yakawanda-nhanho inotungamirwa nekupisa, okisijeni, uye mafuta. Inotanga nekupisa, apo zvinhu zvinonyorovesa uye zvinotora simba, zvichiteverwa nekuparara kwekushisa kwakapoteredza 300-400 ° C, kusunungura magasi anoputika semahydrocarboni uye phenols. Kubatidza kunoitika kana magasi aya asangana neokisijeni uye osvika patembiricha yekudzima moto, zvichitungamira mukupisa kwakasimba nekupararira kwemurazvo. Epoxies inoburitsa kupisa kwakanyanya (kupisa kusunungurwa kwe ~ 50-60 MJ/m²) uye kuburitsa utsi hwakakora, kuwedzera njodzi dzemoto kuburikidza nekuderedza kuoneka uye chepfu kubva kumakomponi akaita seCO neHCN.

LOI yavo yakaderera (19.8%) inoreva kupisa zviri nyore mumhepo (21% oxygen), kazhinji nekudonha kunoparadzira moto. Zvinhu zvakadai semamolecular chimiro-zvinonhuhwirira zvindori mubisphenol A marudzi-pesvedzero yekuora, asi pasina retardants, epoxies inotadza bvunzo dzemoto seUL-94. Kupisa uku kunoganhurira kushandiswa kwadzo munzvimbo dzine njodzi huru, zvichiita kuti zvigadziriswe zvidzore kuvhiringa kutenderera kwekupisa.

 

Flame Retardant Mechanisms

Kudzoserwa kwemoto mune epoxy adhesives kunoshanda kuburikidza negasi-chikamu uye yakapfupika-chikamu maitiro, kazhinji synergistically. Muchikamu chegasi, retardants inoburitsa radicals (semuenzaniso, PO• kubva kune phosphorus compounds) inodzima zvinopisa H• uye OH• radicals, kukanganisa cheni maitiro uye kuderedza kupisa kusunungurwa. Zviito zvecondensed-phase zvinosanganisira kuumbwa kwechar, uko zvinodzoreredza zvinokonzeresa kupera mvura mumuviri uye kuyambuka-kubatanidza kugadzira chinovharira chinodzivirira substrate, chinodzikamisa okisijeni kupinda, uye inoderedza kuburitswa kwemhepo.

Intumescent masisitimu anokura kuita foamy chars, inosimudzira dziviriro. Semuenzaniso, phosphorus-boron synergies inosimudzira phosphate esters inokurudzira dense chars, ichidzikisa PHRR ne10-20%. Dilution mhedzisiro kubva kumagasi asingabatike (semuenzaniso, NH3 kubva kune nitrogen makomponi) uye endothermic decomposition (semuenzaniso, boron hydroxides inotora kupisa) inowedzera kudzvanya marimi. Mukunamatira, nzira idzi dzinofanirwa kuchengetedza kubatana kwemukati; reactive retardants inobatanidza zvisina musono, kuchengetedza kunamatira uchiwana LOI> 30% uye V-0 ratings.

 

Mhando dzeFlame Retardants yeEpoxy Adhesives

Flame retardants ye epoxy adhesives inoiswa seyekuwedzera kana reactive. Mhando dzekuwedzera, dzakasanganiswa nemuviri, dzinosanganisira inorganic fillers senge aluminium hydroxide kana nanomaterials, inopa nyore asi ine njodzi yekuparadzaniswa kwechikamu uye kuderedzwa kunamatira. Reactive mhando, covalently bonded, inopa yunifomu kupararira uye kushoma kurasikirwa kwepfuma, zvichiita kuti ive yakanaka kune mbiri dziviriro.

Phosphorus-based retardants inotonga, ine makomisheni senge DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) inowana kugona kwepamusoro pakurodha yakaderera. Inoveli DOPO inotorwa, BDD, pa 0.25 wt% phosphorus, inowedzera LOI kusvika 33.4% uye inowana V-0 chiyero, nePHRR yakaderedzwa ne9.1. Boron compounds, senge boronic acids, inovandudza char kugadzikana, kazhinji inopindirana ne phosphorus ye LOI inokosha ye26-30% pa 2 wt%.

Nanomaterials senge graphene uye kabhoni nanotubes inovandudza kunonoka kuburikidza nezvivhariso zvinokonzeresa, kuderedza utsi uye kuparara. Graphene-phosphorus mahybrids ari mucomposites anoburitsa V-0 zviyero zvine simba rakachengetedzwa. Bio-based retardants, yakabva kune vanillin kana cardanol, inopa kugadzikana; vanillin-phosphazene masisitimu anowana LOI 34.2% uye kudzokorora.

Intumescent additives mune zvinonamira zvinogonesa debonding kuti idzokororwe, iine ammonium polyphosphate ichikura kuti iite zinyekenyeke mabhondi pasi pekupisa uku ichipa kudzivirira kwemoto. Multi-element system (PN-Si) inowedzera kukwidziridza mashandiro, ichidzikisa THR ne30-60% mumacomposites. Kusarudzwa kunoenderana nekushandisa; zvemagetsi zvinoda mhando dzefodya dzakaderera, nepo muchadenga chichifarira akasimba-simba reactive.

 

Kuwana Dziviriro Yaviri: Kuenzanisa Kunamatira uye Kudzoreredza Murazvo

Dambudziko mumurazvo unodzoreredza epoxy adhesives kuchengetedza kunamatira kwakasimba pakati pekuwedzera kusingadzoreki, sezvo kurodha kwakanyanya kunogona kuwedzera brittleness kana kuderedza kuyambuka-kubatanidza. Maitiro ekurodha pasi, senge 0.25 wt% phosphorus muBDD-modified epoxies, kuderedza kusimba kwesimba kurasikirwa (kusvika 77 MPa, 6.4% inodonha) uchiwana V-0. Reactive kubatanidzwa kunovimbisa kugarisana, ne phosphazene kubatanidza pane fibers inosimudzira interfacial shear simba ne70-200% kuburikidza nemakemikari bonding.

Kugadziridzwa kwepamusoro, senge silane coupling, kunatsiridza kunyorova, kuwedzera simba rekugera paaluminium kusvika ku12 MPa kunyangwe mushure mekudzika-kupisa. Synergistic modhifita senge phosphorus-boron-graphene inochengetedza modulus (kusvika 3000 MPa) uye kunamatira nekudzivisa agglomeration. Mune intumescent adhesives, retardants inogonesa inodzorwa debonding pasina yekutanga adhesion kurasikirwa, yakanakira recycle bhondi. Pakazere, dziviriro mbiri dzinoonekwa kuburikidza neakagadziridzwa maumbirwo ayo anowedzera reactive chemistry kune yakaenzana zvivakwa.

 

Applications

Epoxy flame retardant adhesives tsvaga kushandiswa kwakawanda uko kuchengetedzwa kwemoto uye kubatana kwakakosha. Mune zvemagetsi, vanosunga mabhodhi edunhu, vachipa V-0 retardancy uye kutungamira kwekupisa kwekupisa kupisa. Zvishandiso zvemuchadenga zvinosanganisira zvemukati zvendege uye macomposites, uko phosphorus-yakagadziridzwa epoxies inovimbisa kumira kwemurazvo mumasisitimu emafuta uye mapaneru ezvimiro.

Mumotokari, vanochengetedza zvemukati-zvinodzoreredza moto uye zvinhu zvinopedza simba, zvichideredza njodzi dzekudzima. Kuvaka kunobatsira kubva kumachira uye zvinonamira zvesimbi/huni dziviriro muzvivakwa nefenicha. Kushandiswa kwechiuto kunosanganisira zvinoputika zvinosanganisa, ukuwo zvikamu zvesimba rinomutsidzirwa zvinozvishandisa mumablades emhepo kuti zvigare uye kuchengeteka. Aya anonamira anogonesa kureruka, akachengeteka dhizaini mumaindasitiri.

 

Matambudziko uye Nenguva Yemberi

Kunyangwe kufambira mberi, zvinonetsa zvinoramba zviripo: kurodha kwakanyanya kunoshatisa zvivakwa, uye mhando dzehalogen dzinoisa njodzi kwezvakatipoteredza, zvichiita kuti halogen-isina shanduko. Kupararira nyaya mune zvinowedzera zvinogona kuderedza kunamatira, uye mutengo unotadzisa scalability.

Mafambiro emangwana anosimbisa bio-based retardants yekusimudzira, senge vanillin-yakatorwa masisitimu anogonesa kudzokorodza ne> 90% simba rekudzoreredza. Nanomaterial synergies uye zvinhu zvakangwara zvine kuzvirapa zvinogona kuwedzera kuwanda kwekushanda. Tsvagiridzo inotarisa pane yakaderera-chepfu, yakakwira-inoshanda maumbirwo ekusangana nemirau, ine tarisiro mune yakasvibira chemistry yekunamatira eco-inoshamwaridzika.

mhedziso

Epoxy flame retardant adhesives muenzaniso wedziviriro mbiri, kubatanidza kunamatira kwakasimba nekureba kwemoto wemoto kuburikidza nehunyanzvi hwekudzoreredza. Sezvo maindasitiri achitungamira kuchengetedza uye kusimba, zvinhu izvi zvinofambisa hunyanzvi hweramangwana, kuve nechokwadi chekuita kwakavimbika mumashandisirwo anopisa moto.

Kuti uwane zvimwe nezve epoxy flame retardant adhesive: mbiri chengetedzo yeadhesion yakasimba uye yakakwira murazvo retadancy, unogona kushanya kuDeepmaterial pa. https://www.adhesivesmanufacturer.com/ nokuti zvimwe info.