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2024年3月25日发(作者：cp汇编语言是一种)

43

EpoxyResinAdhesives

ng

Consultant,Johannesburg,SouthAfrica

UCTION

Epoxyorepoxideresinsareagroupofreactivecompoundsthatarecharacterizedbythe

presenceoftheoxiranegroup

Theyarecapableofreactingwithsuitablehardenerstoformcross-linkedmatricesofgreat

kesthem

ideallysuitedtoadhesiveapplicationsinwhichhighstrengthunderadverseconditions

niquecharacteristicsincludenegligibleshrinkageduringcure,an

opentimeequaltotheusablelife,excellentchemicalresistance,abilitytobondnonporous

substrates,ghtheywerehailedaswonderproductswhenfirst

introduced,ve,however,

clearlyestablishedniches,especiallyinhigh-technologyapplications,andhaveshown

steadygrowth,fepoxyresinsinEurope,

forexample,totaled101,000metrictonsin1980,150,000metrictonsin1985,and205,000

metrictonsin1990.

Althoughworkonepoxyresinsstartedinthemid-1920s,thefirstcommercially

erebasedonthediglycidyl

etherofbisphenolA(usuallyreferredtoasDGEBAresins),andtodaytheseresins,ina

rangeofmolecularweights,rast,

however,hardenerscomeinavarietyofshapesandsizes,includingaminesandamides,

mercaptans,anhydrides,ofhardenerdependsonthe

applicationrequirements,andthewiderangeofhardenersavailableincreasestheversa-

tilityofadhesivesbasedonepoxyresins.

Copyright © 2003 by Taylor & Francis Group, LLC

TRYOFEPOXYRESINS

Epichlorhydriniscapableofreactingwithhydroxylgroups,withtheeliminationofhydro-

twidelyusedepoxyresinsarethefamilyofproductsproducedbythe

reactionbetweenepichlorhydrinandbisphenolA.

Thisreactswithadditionalepichlorhydrintoproduceamoleculeofgeneralstructure

Commerciallyusefulgradesarerelativelylow-molecular-weightproductsinwhichn

sbetween0and1,theproductisaliquid,andthis

reases,theproductmoves

radesfilessof

molecularweight,ofgreater

functionalitycanbeproducedfrompolyolshavingmorethantwohydroxylgroupsper

enolnovolacresins,havingthegeneralstructurecanbereactedwith

epichlorhydrintoproduceepoxynovolacresins.

Copyright © 2003 by Taylor & Francis Group, LLC


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