Epoxy Nplaim Retardant Adhesive: Dual Protection of Strong Adhesion thiab High Flame Retardancy

 

Epoxy adhesives tau hloov pauv kev tsim khoom niaj hnub thiab kev tsim kho vim lawv qhov tshwj xeeb kev sib koom ua ke, muaj peev xwm ua tau zoo, thiab ua haujlwm ntev. Muab tau los ntawm epoxy resins, cov nplaum no yog thermosetting polymers tsim los ntawm cov tshuaj tiv thaiv ntawm epoxide pawg nrog cov tshuaj tua kab mob, xws li amines lossis anhydrides, uas ua rau muaj kev sib txuas sib txuas uas muab cov nplaum nplaum rau ntau yam ntawm cov substrates xws li hlau, plastics, composites, thiab ceramics. Lawv siv dav dav hauv kev lag luam xws li aerospace, automotive, electronics, thiab kev tsim kho, qhov chaw uas lawv ua rau cov qauv tsim, kev ua haujlwm ruaj khov, thiab cov txheej txheem sib dhos ua tau zoo. Txawm li cas los xij, qhov kev txwv tseem ceeb ntawm cov tshuaj epoxy ib txwm yog lawv cov nplaim taws. Epoxy resins, feem ntau muaj cov pa roj carbon, hydrogen, thiab oxygen, pom qhov qis qis qis qis qis qis (LOI) qhov tseem ceeb nyob ib puag ncig 19-20%, ua rau lawv nquag tawg, nplaim taws sai sai, thiab tso tawm cov pa luam yeeb thiab cov molten droplets thaum combustion. Qhov no ua rau muaj kev nyab xeeb tseem ceeb hauv cov ntawv thov raug hluav taws kub, xws li cov khoom siv hluav taws xob, lub dav hlau sab hauv, thiab cov khoom siv hauv tsev.

Txhawm rau hais txog qhov no, cov kws tshawb fawb tau tsim cov nplaim hluav taws kub hnyiab epoxy nplaum uas muaj cov khoom siv ntxiv lossis cov neeg ua haujlwm reactive los txhim kho hluav taws kub tsis muaj kev cuam tshuam lub zog adhesion. Lub tswv yim ntawm "kev tiv thaiv dual" yog hais txog kev sib koom ua ke ntawm kev sib koom ua ke ntawm kev sib raug zoo thiab cov nplaim hluav taws kub, ua tiav los ntawm cov qauv tsim tshiab uas sib npaug cov khoom no. Kev nce qib tsis ntev los no tsom mus rau halogen-dawb retardants, xws li phosphorus-based compounds, boron derivatives, thiab nanomaterials zoo li graphene, uas txhawb char tsim thiab radical quenching kom txo cov nplaim taws. Piv txwv li, cov khoom siv phosphorus qis qis tuaj yeem ua tiav UL-94 V-0 kev ntsuas - tus qauv rau cov khoom siv tua tus kheej - nrog rau kev cuam tshuam tsawg heev ntawm tensile thiab shear zog. Cov kev tsim kho no tsis tsuas yog ua raws li cov cai nruj kev nyab xeeb hluav taws tab sis kuj ua raws li ib puag ncig kev ruaj ntseg los ntawm kev txo cov pa phem.

Kab lus no tshawb txog cov hauv paus ntsiab lus ntawm epoxy nplaim retardant adhesives, lawv cov txheej txheem, hom, kev siv, kev sib tw, thiab kev cia siab rau yav tom ntej. Los ntawm kev sib koom ua ke cov kev tshawb fawb txiav, nws qhia txog yuav ua li cas cov ntaub ntawv no muab kev tiv thaiv dual, ua kom muaj kev nyab xeeb thiab kev ua tau zoo hauv qhov xav tau ib puag ncig. Kev hloov pauv ntawm cov nplaum nplaum no qhia txog kev hloov pauv mus rau cov khoom siv ntau yam uas ua tau raws li qhov xav tau ntawm ob qhov kev thov ntawm adhesion thiab hluav taws kub, paving txoj hauv kev rau kev nyab xeeb dua tshiab thoob plaws cov haujlwm.

Qhov tseem ceeb ntawm Epoxy Adhesives

Epoxy adhesives yog raws li epoxy resins, feem ntau bisphenol A diglycidyl ether (DGEBA), uas hnov ​​​​mob nrog hardeners los ua ib tug nruj, cross-linked qauv. Cov txheej txheem kho muaj xws li lub nplhaib-qhib polymerization, qhov twg epoxide rings qhib thiab txuas nrog amine lossis lwm pab pawg ua haujlwm, tsim kom muaj kev sib txuas ntawm peb sab. Lub network no muab cov khoom siv zoo heev, suav nrog lub zog tensile siab (feem ntau tshaj 50 MPa), flexural zog, thiab cuam tshuam tsis kam. Adhesion mechanisms cia siab rau cov tshuaj sib txuas, kev sib txuas ntawm cov khoom siv, thiab van der Waals rog, tso cai rau cov epoxies rau cov ntaub ntawv sib txawv zoo. Piv txwv li, kev kho saum npoo zoo li cov xuab zeb lossis silane coupling cov neeg ua haujlwm txhim kho cov dej ntub dej thiab lub zog ntawm lub ntsej muag, ua kom muaj zog shear txog li 10-15 MPa ntawm cov hlau zoo li txhuas.

Nyob rau hauv daim ntawv nplaum, cov khoom siv ntxiv xws li silica lossis fibers tau ntxiv los txhim kho viscosity, thixotropy, thiab thermal conductivity, thaum hloov kho xws li cov epoxies hloov tau (xws li, diglycidyl phthalate) txo cov brittleness thiab pab kom ceev ceev ntawm chav tsev kub. Ib txoj kev tshawb fawb ntawm kev hloov kho DGEBA nrog 10 wt% diglycidyl phthalate tau pom tias lub sijhawm gel txo mus rau 54 feeb thiab lub zog tensile nce mus rau 44 MPa, nrog kev txhim kho qhov kub thiab txias mus rau -20 ° C. Qhov kev hloov pauv no yog qhov tseem ceeb rau cov ntawv thov uas xav tau kev sib dhos sai yam tsis muaj cua sov.

Txawm li cas los xij, cov epoxies uas tsis tau hloov pauv yog cov nplaim taws, nrog rau qhov siab tshaj plaws tso tawm tus nqi (PHRR) tshaj 800 kW / m² hauv kev sim ntsuas calorimetry, ua rau kom tawg sai thiab cov pa luam yeeb ntau lawm. Txhawm rau txo qhov no, cov nplaim hluav taws xob sib xyaw ua ke, tab sis lawv yuav tsum tsis txhob cuam tshuam cov kev kho kinetics lossis adhesion. Reactive retardants, chemically bonded rau hauv lub matrix, muab kev sib raug zoo zoo dua li additives, khaws cia adhesion thaum txhim kho kev nyab xeeb hluav taws. Zuag qhia tag nrho, cov hauv paus ntsiab lus hais txog qhov yuav tsum tau ua kom haum cov qauv uas ua kom zoo tshaj qhov sib txuas sib txuas kom ruaj khov thiab ruaj khov.

 

Combustion thiab Flammability ntawm Epoxy Resins

Lub combustion ntawm epoxy resins yog txheej txheem ntau theem uas tau tsav los ntawm tshav kub, oxygen, thiab roj. Nws pib nrog cua sov, qhov twg cov khoom softens thiab absorbs lub zog, ua raws li thermal decomposition nyob ib ncig ntawm 300-400 ° C, tso tawm volatile gases xws li hydrocarbons thiab phenols. Ignition tshwm sim thaum cov gases sib xyaw nrog oxygen thiab ncav cuag qhov kub ntawm qhov pib-ignition, ua rau muaj kev sib txuas nrog cov nplaim hluav taws. Epoxies tso tawm cov cua kub tseem ceeb (tag nrho cov cua sov tso tawm ~ 50-60 MJ / m²) thiab tsim cov pa taws hnyav, ua rau muaj kev phom sij ntau dua los ntawm kev txo qhov pom thiab muaj tshuaj lom los ntawm cov tebchaw xws li CO thiab HCN.

Lawv cov LOI qis (19.8%) txhais tau hais tias lawv hlawv yooj yim hauv huab cua (21%), feem ntau nrog cov dej ntws uas kis hluav taws. Cov yam ntxwv zoo li cov qauv molecular-aromatic rings nyob rau hauv bisphenol A hom-kev cuam tshuam decomposition, tab sis tsis muaj retardants, epoxies tsis kuaj hluav taws zoo li UL-94. Qhov no flammability txwv lawv cov kev siv nyob rau hauv high-kev pheej hmoo cheeb tsam, yuav tsum tau retardants los cuam tshuam lub combustion voj voog.

 

Nplaim Retardant Mechanisms

nplaim retardancy nyob rau hauv epoxy adhesives ua hauj lwm los ntawm gas-theem thiab condensed-theem mechanisms, feem ntau synergistically. Nyob rau hauv cov roj theem, retardants tso tawm radicals (xws li, PO• los ntawm phosphorus tebchaw) uas quench flammable H• thiab OH• radicals, disrupting chain reactions thiab txo tshav kub tso. Condensed-theem kev nqis tes ua cuam tshuam nrog kev tsim cov char, qhov twg cov retardants catalyze lub cev qhuav dej thiab kev sib txuas los tsim ib qho kev tiv thaiv kev tiv thaiv uas insulates lub substrate, txwv oxygen ingress, thiab txo cov emissions volatile.

Intumescent systems nthuav dav los ua foamy chars, txhawb kev tiv thaiv. Piv txwv li, phosphorus-boron synergies txhawb phosphate esters uas txhawb nqa cov khoom ntom ntom, txo PHRR los ntawm 10-20%. Dilution los ntawm cov roj uas tsis yog-flammable (xws li, NH3 los ntawm nitrogen tebchaw) thiab endothermic decomposition (xws li, boron hydroxides absorbing tshav kub) ntxiv suppress nplaim taws. Hauv cov nplaum, cov txheej txheem no yuav tsum khaws cov kev sib txuas ntawm lub ntsej muag; reactive retardants integrate seamlessly, tswj adhesion thaum ua tiav LOI> 30% thiab V-0 kev ntsuam xyuas.

 

Hom Nplaim Retardants rau Epoxy Adhesives

nplaim retardants rau epoxy adhesives yog cais raws li additives los yog reactive. Cov khoom siv ntxiv, lub cev sib xyaw, suav nrog cov khoom siv tsis zoo xws li txhuas hydroxide lossis nanomaterials, muab kev yooj yim tab sis pheej hmoo rau theem sib cais thiab txo qhov adhesion. Reactive hom, covalently bonded, muab cov dispersion zoo li qub thiab cov khoom poob tsawg, ua rau lawv zoo tagnrho rau kev tiv thaiv dual.

Phosphorus-raws li retardants dominate, nrog cov tebchaw zoo li DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) ua tau zoo ntawm kev thauj khoom tsawg. Ib qho tshiab DOPO derivative, BDD, ntawm 0.25 wt% phosphorus, boosts LOI mus rau 33.4% thiab attains V-0 ntsuam xyuas, nrog PHRR txo los ntawm 9.1% ntawm radical quenching thiab char nce qib. Boron tebchaw, xws li boronic acids, txhim khu char stability, feem ntau synergizing nrog phosphorus rau LOI qhov tseem ceeb ntawm 26-30% ntawm 2 wt%.

Nanomaterials zoo li graphene thiab carbon nanotubes txhim kho retardancy los ntawm kev cuam tshuam, txo cov pa luam yeeb thiab volatiles. Graphene-phosphorus hybrids nyob rau hauv composites tawm los V-0 kev ntsuam xyuas nrog khaws cia lub zog tensile. Bio-raws li retardants, muab los ntawm vanillin los yog cardanol, muaj kev ruaj ntseg; vanillin-phosphazene systems ua tiav LOI 34.2% thiab rov ua dua tshiab.

Intumescent additives nyob rau hauv adhesives pab kom debonding rau recycling, nrog ammonium polyphosphate expanding kom tsis muaj zog bonds nyob rau hauv tshav kub thaum muab hluav taws xob tiv thaiv. Multi-element systems (PN-Si) ntxiv kev ua tau zoo, txo THR los ntawm 30-60% hauv cov khoom sib xyaw. Kev xaiv nyob ntawm daim ntawv thov; electronics xav tau hom pa luam yeeb tsawg, thaum aerospace nyiam cov muaj zog reactive.

 

Ua tiav Kev Tiv Thaiv Dual: Ntsuas Adhesion thiab Nplaim Retardancy

Qhov kev sib tw hauv nplaim hluav taws retardant epoxy adhesives yog tswj kom muaj zog adhesion nyob rau hauv retardant ntxiv, raws li cov loadings siab yuav ua rau kom brittleness los yog txo tus ntoo khaub lig-linking. Tsawg-loading tswv yim, zoo li 0.25 wt% phosphorus hauv BDD-hloov epoxies, txo qis tensile lub zog poob (rau 77 MPa, 6.4% poob) thaum ua tiav V-0. Kev sib koom ua ke ua kom muaj kev sib raug zoo, nrog phosphazene grafting ntawm fibers pab txhawb kev sib tshuam ntawm lub zog los ntawm 70-200% ntawm kev sib txuas tshuaj.

Kev hloov kho saum npoo, xws li silane coupling, txhim kho wettability, boosting shear zog ntawm txhuas mus rau 12 MPa txawm tias tom qab qhov kub thiab txias. Synergistic modifiers xws li phosphorus-boron-graphene khaws cia modulus (txog 3000 MPa) thiab adhesion los ntawm kev zam agglomeration. Nyob rau hauv intumescent adhesives, retardants pab tswj kev debonding yam tsis tau pib adhesion poob, zoo tagnrho rau recyclable bonds. Zuag qhia tag nrho, kev tiv thaiv dual yog pom tau los ntawm kev ua kom zoo tshaj plaws uas siv cov tshuaj reactive chemistry rau cov khoom sib npaug.

 

daim ntawv sau npe

Epoxy nplaim retardant adhesives nrhiav kev siv dav hauv qhov kev nyab xeeb hluav taws thiab kev sib txuas lus tseem ceeb. Nyob rau hauv cov khoom siv hluav taws xob, lawv daim ntawv cog lus Circuit Court boards, muab V-0 retardancy thiab thermal tswj rau cua sov dissipation. Aerospace daim ntaub ntawv muaj xws li aircraft interiors thiab composites, qhov twg phosphorus-hloov epoxies xyuas kom cov nplaim tsis kam nyob rau hauv roj systems thiab structural panels.

Nyob rau hauv tsheb, lawv ruaj ntseg hluav taws-retardant interiors thiab tso pa Cheebtsam, txo ignition txaus ntshai. Kev tsim kho tau txais txiaj ntsig los ntawm cov txheej txheem thiab cov nplaum rau cov hlau / ntoo tiv thaiv hauv tsev thiab rooj tog. Kev siv tub rog suav nrog cov khoom tawg, thaum cov khoom siv hluav taws xob txuas ntxiv siv tau rau hauv cov cua tshuab kom ruaj khov thiab nyab xeeb. Cov nplaum no ua rau lub teeb yuag, tsim kev nyab xeeb thoob plaws kev lag luam.

 

Cov kev sib tw thiab yav tom ntej Trends

Txawm hais tias muaj kev vam meej, cov kev cov nyom tseem muaj: cov khoom siv retardant siab degrade cov cuab yeej cuab tam, thiab halogen-based hom ua rau muaj kev pheej hmoo ntawm ib puag ncig, ua rau tsis muaj halogen hloov pauv. Dispersion teeb meem nyob rau hauv additives tuaj yeem ua rau tsis muaj zog adhesion, thiab cov nqi cuam tshuam scalability.

Yav tom ntej tiam sis hais txog bio-raws li retardants rau sustainability, xws li vanillin-derived systems ua rau recyclability nrog> 90% lub zog rov qab. Nanomaterial synergies thiab cov ntaub ntawv ntse nrog kev kho tus kheej tuaj yeem txhim kho ntau txoj haujlwm. Kev tshawb fawb tsom mus rau cov tshuaj lom neeg tsawg, cov txheej txheem ua tau zoo kom ua tau raws li cov cai, nrog rau kev cia siab hauv ntsuab chemistry rau eco-friendly adhesives.

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Epoxy nplaim retardant adhesives ua piv txwv dual kev tiv thaiv, sib txuas muaj zog adhesion nrog siab nplaim taws retardancy los ntawm lub retardants tshiab. Raws li kev lag luam saib xyuas qhov tseem ceeb ntawm kev nyab xeeb thiab kev ruaj ntseg, cov ntaub ntawv no yuav tsav cov kev tsim kho tshiab yav tom ntej, ua kom muaj kev ntseeg tau zoo hauv kev siv hluav taws kub.

Yog xav paub ntxiv txog epoxy nplaim retardant adhesive: dual kev tiv thaiv ntawm muaj zog adhesion thiab siab nplaim retardancy, koj tuaj yeem mus ntsib Deepmaterial ntawm https://www.adhesivesmanufacturer.com/ yog xav paub ntau info.