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1、熟悉建筑高分子材料的特性与应用（Familiarwiththecharacteristicsandapplicationsofbuildingpolymermaterials）FamiliarwiththecharacteristicsandapplicationsofbuildingpolymermaterialsI.BuildingPlastics(a)basicknowledgeofplastic:plasticismadeofsyntheticornaturalpolymerresinas
2、basicmaterial,andthenbyaddingacertainproportionoffiller,plasticizer,curingagent,coloringagentandotheradditives,mixing,plasticizationandmoldingbyundercertainconditions,cankeeptheproductshapeundernormaltemperatureandpressureofmaterials.1.Synthesisofhigh
3、polymerresin:canbedividedintothermoplasticresinandthermosettingresin.Thethermoplasticresinissoftenedbyheatandcooledandhardened,andtheprocesscanberepeatedmanytimes.Thermosettingresincanbesoftenedbyheatingwhenitisprocessed,butitwillnotsoftenandchangesha
4、peevenafterheating.(1)thermoplasticresins:PVC,polyethylene,polystyrene,polypropyleneandsoon.(2)thermosettingresins:phenolicresin,epoxyresin,siliconeresin,polyamide(nylon),melamine,formaldehyderesin,etc..2:characteristics:lightquality,insulation,wearre
5、sistance,corrosionresistance,heatinsulation,soundinsulationandothergoodperformance,butalsohaspoorheatresistance,flammable,easyaging,stiffness,thermalexpansionandothershortcomings.3:application:canbeusedasdecorativematerials,insulationmaterials,sound-a
6、bsorbingmaterials,fireprotectionmaterials,wallmaterials,pipesandsanitaryware.(two)plasticpipes1,rigidpolyvinylchloride(PVC-U)pipe:usetemperatureisnotgreaterthan40degreesafter,soitiscoldwaterpipe.Goodagingresistance,flameretardant,flexiblerubberringins
7、tallation.Usedforwatersupplypipes(nonpotablewater),drainagepipes,andstormwaterpipes.2,chlorinatedpolyvinylchloride(PVC-C)tube:hightemperature,highmechanicalstrength,suitableforcompressionoccasions.Usetemperatureofupto90degreesCelsius,lifeofupto50years
8、.Theinstallationmethodisconvenient,andtheconnectingmethodissolventbonding,threadconnection,flangeconnectionandweldingrodconnection.Flameretardant,fireretardant,lowthermalconductivity,lessheatloss.Notethattheglueusedistoxic.Applytohotandcoldwat
