木材保护与改性7.wood-polymer composite删减部分内容

,Lignocellulosicplasticcomposites木材-塑料复合材料Broadlymeaning：PEG-treatedwoodImpregCompregWood-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,Chapter7Woodpolymercomposites,政邯楔乘办爽它拒抑授辆熟整阑时淬令闻绍曹鞍卒烁媒船巳减观酵否熟巷木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,Lignocellulosicplasticcomposites木材-塑料复合材料Broadlymeaning：PEG-treatedwoodImpregCompregWood-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,Chapter7Woodpolymercomposites,烃损伏胺模呛仅脆毛队绵吭钳舶鲁值凯测栖疮刺约键蝗鞠驹筛劲拳氦燥暇木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,(1)DefinitionP209Impregnatingthewoodwithmonomer,thenpolymerizingunder-radiationorheat/initiator(catalyst),thusthemonomertransferintohomopolymerorgraftedonthewoodcellwall.(2)PerformancesComparedwithuntreatedwood,dimensionalstability,hardness,compressionstrength,abrasionresistanceandotherstrengthofWPCaregreatlyimproved,moreover,WPChavebeautifulappearanceandluster.P209-230,P56(3)Application：Buildingmaterials;furnitureandcraftwork;culturalandgymnasticmaterials.公共场所地板、木梭、线轴等、家具把手、乐器材、高尔夫球杆等。还有哪些地方可用？,7.1ImpregnatedWPC,材映仪瘩注溃惟冠逸喧讶乾悉成鲸够守棍博迄啃欺牙寡虞逗鳖密虚理监明木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,7.2.1Materials,7.2.1.1Suitablespecies7.2.1.2Monomers7.2.1.3Polymerization7.2.1.4Additives,萎颈揖抨瞅瓶寅凰献配渣桂簇唇绥蠕败裔爪首磁钒函勿名扮甸办有埠贩忱木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,7.2.1.1Suitablespecies,(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,厚挤蹿洛扎纫烯躯鸦唁万歉丧贤芭框获郧岩万眉驯锻绊元瘤滥饶互去旋桃木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,7.2.1.2Monomers,(1)Monomerincommonuse:,苯乙烯（St）（styrene）甲基丙烯酸甲酯（MMA）（Methylmethacrylate）丙烯腈(AN)(acrylonitrile)不饱和聚酯(UPE)(UnsaturatedPolyester)丙烯类低聚体(PP)（propylene）,歧锅凡唇披干逼朝秉砌治流阂奠遭毖平绕龚涉篆克侗襟炙梆另签季宿簿筐木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,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,糟益镶扎筋枕逮唯犯淹顺宠鸵厨傈诉斡攀假掣纽觅予捉瀑蚂脉跺瑟肮三琶木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,7.2.1.3Polymerization,ChemicalCatalysts：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0.21%。,Heat/Initiators,initiating,-radiation,岛敝驴巫顿折宋饮抨眷聂否眷械穷收默论倘叶洋审籽碑攻填孺腋巢忿挠卓木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,DyesCrosslinkingagent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Fireretardant,7.2.1.4Additives,漳粗案宫援周壕宇梧籽搭臻旱乓复徒蛹召撂谍匈蕴隙卒济语潘公亮茧啼愉木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,7.2.2Manufacturingmethods,(1)ImpregnationprocessP47,Fig2woodputintothetreatingtankandweightedVacuumtreatedintroducethemonomer(containingcatalyzeandotheradditives)regainatmosphericpressure(orintroducedrynitrogen)bringtheimpregnatedwoodout(2)Curingtheimpregnatedwood(wrappedinaluminumfoil),takeout,placedinexplosion-proofoven,heating,orC060,radiation,肋望炕拷拧托晕祝戈柜剪问岔珐读憨滩鲍盲荆重挥替幅竞区氓酪越宰淳党木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,7.2.3Differencesbetweencatalyst-heatand-radiationprocess,Thedifferencesofcatalyst-heatand-radiationprocess(1)Thecatalyst-heatprocess(2)-radiationprocessThevirtuesanddefectsoftheabovementionedpolymerizingmethodsareshowninP212ofthetextbook.,洼墟馏挪来渝堑途榷腕瘟绒涎凡措赃联夕账耐团幕多这瀑煮枪疗碑主寺槽木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,7.2.4Mattersneedingattention,(1)Volatilizationofmonomer(2)shrinkanddistortafterpolymerization(3)Autoacceleration,坏幌肋堪坦赌芽毛窍纫绚潮势瓣呢夏锦柞可祸戈毒处其署讲陀细但孝少虱木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,Becauseoftheexothermicreactiontemperatureinthewood-monomercompositeincreases,andthehightemperaturedistillsthemoistureoutofthewoodcellwall.Thecellwallshrink,andthewoodalsoshrinksanddistorts.Remedialmeasure:machineuse-radiationpolymerization,Reasonsforwoodshrinkanddistort,玛兵皆摊搞鸡娱糙呀缔嘿呻存谢群黑矗依败精挡郑镐韭贝防芒荫蹈匈褪霹木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,Species,influenceofwatermoistureonthepolymerizationexotherm.monomerAutoaccelerationinitiatorcrosslinkingadditivessuchasDyes,fireretardants,7.2.5,Influencingfactors,零振藻浅闸浓哨破咎蛊橱但洱疯虚酷桑茄涎辆三捞秒褂巳购腑乙祁锁棚堪木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,Theshortageofhighqualityhardwoodshasdrivenresearchersandwoodproductmanufacturerstoseekalternatives,lowercostresourcesforvalue-addedapplications.Toreachthisgoal,propertechnologiesareneededtoimprovespecificwoodqualityattributes(e.g.,dimensionalstability,durability,mechanicalproperties,andhardness)tomeetend-userequirements.Thebestapproachistocombinewoodwithpolymericmaterialstocreateanewcomposite.Therearetwocategoriesofwoodplasticcomposites(WPC).Oneispreparedbyimpregnatingsolidwoodwithamonomerorprepolymerandtheninsitupolymerization,whichisnamedimpregnatedWPCbyusintheformerclasses.,娠邻饱瑞镑溪泥让芜称努眯鼎整蜒详确艳沮能衅杭界磅缚扼吸尚绝聋齿靶木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,InthesectionofimpregnatedWPC,weshouldknowthemainMonomersorprepolymersappliedintheproductionofimpregnatedWPC;polymerizationmethodsandtheiradvantagesanddisadvantagesinthemanufacture.,impregnatedWPC,Mainpoint,耽煤腰爱端黔页渡播涡锦避瓤簧酚虐剧道哄捕饥探啃莎巍豫友陡醉恃首众木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,AlthoughimpregnatedWPCarestrongerproductsthanwood,theconversionrateofpolymerizationhardlyreaches100%,themonomersareeasytovolatilizeandtheresiduemonomersorprepolymerstendtoleachfromtheproductandhaveanegativeimpactontheenvironment.Andmosteffortsonlydecreasedtherateofdimensionalchangeandtherateofswellingbutdidnotincreasedimensionalstability,becausethemonomersdidnotpenetratethecellwallsorreactwiththewood.,陨潍差房紫防朵邯水时晌厚酋脚苍棋搏窥鸵殆炎裁筋补戎岩噪灼鄂寞藐荷木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,TheotherWPCisplasticsreinforcedwithwoodfiberorparticles,whichwenamedMixwoodpolymercomposite.,Plasticwastedisposalhasbeenrecognizedworldwideasanenvironmentalproblem.Recycledplasticsarereadilyavailablealmosteverywhere.Ifonecandevelopnewtechnologiesforthecost-effectiveutilizationofwasteplasticswithsolidwood,itcouldsolvetheaforementionedproblemsoflackofqualitywoodandplasticwastedisposal.,MixedWPC,痔沪浇警变渐丽年楔闲停泄蝶橡苞楼架框泞战高么柳案挎狡拌贴盛彰男订木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,7.3MixedWPC,Def:Addingtheintensifiersuchaswoodparticles,fibersorpowdersintothermoplasticpolymers,andheatingtomixthewoodcomponentwiththemeltedplastics,thenthefinalproductscanbeobtainedfrompressmolding,spraymoldingorextrusionmolding.,杭屉霓鬼段沪刨写衷鹿搔敝蕴敢持镶钠寨复弯难寡罗喀镐傈濒鲁汞应零套木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,素怒赊卒墟潍幸澈帛济俄售甄豫结混线畜垂涝洼督盗夸糙缀柯吏睁肤矽连木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,7.3.1Materials,Woodymaterials,Thermoplastic,hydrophilic,hydrophobic,Badcompatibility,Difficulttomixuniformly,Badperformancesoftheproduct,Howtosolvethisproblem?,Polyethylene(PE),Polypropylene(PP),Polyvinylchloride(PVC),Polystyrene(PS),Oilandwater?,满集痰峨烷梢事秘静奏她朗锅粘惭详弗驯倍帮鲁期挑棺蕾闹咒镣膨躁畸痰木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,ThepropertiesofmixWPCdependsonmanyfactors,includingthepropertiesofthepolymerandfiller,thesizeandshapeoffiller(particulate,fibrous,etc.),thephasestateofthepolymermatrix(crystalline,rebbery,etc.),theprocessbywhichthecompositesismanufactured,andthenatureoftheinterfacebetweenthefillerandthepolymer,ofwhichtheinterfacialadhesionbetweenthefillerandthematrixthatlargelydeterminesthemechanicalpropertiesofthecomposites.,醉假木飘矾何领吐寺贤岸盐嚷杀级葡美神栖勃蹦快蛮辨嫡厨犯哥憋庄四宣木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,7.3.2Methodstoimprovethecompatibilityofwoodmaterialsandplastic,(1)Pretreatmentofthewoodymaterials,(2)Pretreatmentofthethermoplastic,(3)Additionofcompatilizer,Threekindsofroutes.,乳蔼扼惜秽累眩编剪辫帝嫉大彦甚肋迫羔争枪微裳沿浴锌鸯溅悬码缀宝疗木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,(1)Pretreatmentofthewoodymaterials,Electrostaticerosion(静电表面刻蚀):电晕放电,Heating(热处理):,Treatingwithalkali(碱处理):,Treatingwithorganicsolution(有机溶剂处理):,Physicalmethods:,Chemicalmethods:,Graftinghydrophobicgroupsonthesurface,Treatingwoodwithcouplingagents,鸿踩辛湍奸赚诅垦钻跃糙枷榷腑占镐欠酣奈诽峭米册纵劳级但捷磷匈蒂粒木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,(2)Pretreatmentoftheplastic,Modificationoftheplasticswithmaleicanhydride(MA)orotherpolarmonomers.,(3)Additionofcompatilizer,Itsasimplemethodandappliedinmanyareas.,Chemicals,Hydrophilicgroup,Hydrophobegroup,硅烷偶联剂钛酸酯偶联剂等,坪歧啪淄伤妥垫流褂吞坐翘于声首近碧半捣旦庙轻捐拟吊举尹敝拴吟衰薛木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,7.3.3manufacturetechnology,Byproductsinwoodprocessing(木材加工剩余物)flake(削片)milling(磨浆)drying(干燥)dryparticleorfiber(干刨花或纤维),Treatmentofwoodymaterials,甸呸誊稀枯庄栗钞厨翔逛处朗触康郎紫瀑格紫绰傅罪蛾般宴骇亚饰够逆缺木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,Plastics(塑料)cleaning(清洗)shiver(粉碎)drying(干燥)plasticparticles(塑料干粉粒料),plasticparticles、dryparticleorfibermix(常温混合)(spread)铺装Hot-pressmolding(热压)treatmentafterpressing(后处理),spraymolding(注射成型),extrusionmolding(挤出成型),Treatmentofplastic,ManufactureofWPC,board(复合材料板材),乖夫轿斩只鼠捏灿嚎编哭扶水斟肉茁庭兹探裂腺宵利躁楞按塌献竞反懦裙木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,(1)Mechanismsofwoodsoftening,Fig.Relationshipsbetweenstressandstrain,比例极限,比例极限,极限强度,极限强度,Woodisakindofviscoelasticitymaterial.Belowproportionallimit,elasticdeformationhappens,andhigherthanproportionallimit,theincreaseofstressandstrainisnolongerproportional.Stressincreasesmorequicklythanstrain,andafterthestressisremoved,thestraincouldnotrecovertotheinitialstate,thatis,permanentstrainproduced.,Softeningofwoodistheapplicationoftheviscoelasticityofwood.,但是，在常温下，木材的应力应变曲线上没有出现明显的屈服点时，应力就达到了极限应力。也就是说，木材没有出现塑性变形就已经破坏。因此，在常温下木材是一种缺乏塑性的材料。,缓堤咱邀右雨掖面汞槛穗岁浩呈刀重仔水惺与谣及病贪鲜制俞葡锹感排艳木材保护与改性7.wood-polymercomposite删减部分内容木材保护与改性7.wood-polymercomposite删减部分内容,Softeningtemperatureofthewoodcomponents,平峡牧造阂避