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ID:38533448
大小:322.00 KB
页数:32页
时间:2019-06-14
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1、Lignocellulosic–plasticcomposites木材-塑料复合材料Broadlymeaning:①PEG-treatedwood②Impreg③Compreg④Wood-vinylcomposites习惯上把第四种称为木塑复合材,即塑合木(WPC)主讲内容塑合木类木塑复合材混合复合型木塑复合材Chapter7WoodpolymercompositesLignocellulosic–plasticcomposites木材-塑料复合材料Broadlymeaning:①PEG-treatedwood②Impreg③Compreg④Wood-vinylcomposites习
2、惯上把第四种称为木塑复合材,即塑合木(WPC)主讲内容塑合木类木塑复合材混合复合型木塑复合材Chapter7Woodpolymercomposites(1)DefinitionP209Impregnatingthewoodwithmonomer,thenpolymerizingunderγ-radiationorheat/initiator(catalyst),thusthemonomertransferintohomopolymerorgraftedonthewoodcellwall.(2)PerformancesComparedwithuntreatedwood,dimensio
3、nalstability,hardness,compressionstrength,abrasionresistanceandotherstrengthofWPCaregreatlyimproved,moreover,WPChavebeautifulappearanceandluster.<木材保护学>P209-230,P56(3)Application:Buildingmaterials;furnitureandcraftwork;culturalandgymnasticmaterials.公共场所地板、木梭、线轴等、
4、家具把手、乐器材、高尔夫球杆等。还有哪些地方可用?7.1ImpregnatedWPC7.2.1Materials7.2.1.1Suitablespecies7.2.1.2Monomers7.2.1.3Polymerization7.2.1.4Additives7.2.1.1Suitablespecies(1)Permeability:桦木属,槭木属、水青冈,栎木,水曲柳,桤木,杨木等(2)Custom:欧美:槭、桦日本:松、柏,表面WPC化7.2.1.2Monomers(1)Monomerincommonuse:苯乙烯(St)(styrene)甲基丙烯酸甲酯(MMA)(Methylme
5、thacrylate)丙烯腈(AN)(acrylonitrile)不饱和聚酯(UPE)(UnsaturatedPolyester)丙烯类低聚体(PP)(propylene)苯乙烯是WPC开发初期常用的单体,但由于存在聚合所需能量大、聚合不完全等问题,现已不单独使用。苯乙烯(St)+不饱和聚酯(UPE):UPS苯乙烯(St)+丙烯腈(AN):SAN苯乙烯(St)+MMA:苯乙烯-MMA常用7.2.1.3PolymerizationChemicalCatalysts:偶氮二异丁腈(AIBN)等偶氮类引发剂过氧化苯甲酰(BPO)过氧化甲乙酮(MEKPO)等有机过氧化物引发剂对MMA:BPO或
6、AIBN,要着色好常用AIBN对UPS:MEKPO或MEKPO+环烷酸钴引发剂加入量一般为树脂液的0.2~1%。Heat/Initiatorsinitiatingγ-radiationDyesCrosslinkingagent常用:过氧化物交联剂如:1,3-丁二稀,二甲基丙烯酸乙二醇酯,三甲基丙烯酸三羟甲基丙烷等Fireretardant7.2.1.4Additives7.2.2Manufacturingmethods(1)ImpregnationprocessP47,Fig2wood→putintothetreatin
7、gtankandweighted→Vacuumtreated→introducethemonomer(containingcatalyzeandotheradditives)→regainatmosphericpressure(orintroducedrynitrogen)→bringtheimpregnatedwoodout(2)Curingtheimpregnatedwood(→wrappedinaluminumfoil)→takeoutp
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