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1、水性聚丙烯酸酯/聚氨酯的合成及性能研究摘要本文首先以2,4.甲苯二異氰酸酯(TDI)、異佛爾酮二異氰酸酯(IPDI)、聚丙二醇(PPG)、2,2.二羥甲基丁酸(DMBA)、三乙胺(TEA)、乙二胺(EDA)、2.丁炔-l,4-二醇(BDO)等為主要原料,采用自乳化法合成了性能較為優(yōu)異的水性聚氨酯分散體(WPU)。通過改變聚合方法、NC0/oH值、DMBA、EDA、BDO用量和篩選不同類型的異氰酸酯,不同數(shù)均分子量的聚醚二醇合成了一系列水性聚氨酯乳液??疾炝瞬煌簿劢M分和聚合工藝對(duì)、卯U乳液粒徑、膠膜耐水性、漆膜硬度的影響。并借助S
2、EM,力學(xué)實(shí)驗(yàn)技術(shù)研究了不同共聚組分對(duì)乳膠粒形態(tài)和Pu膠膜的力學(xué)性能的影響。。為了改善水性Pu的各項(xiàng)性能,本工作合成了性能較為優(yōu)異的聚丙烯酸酯乳液(PA),同時(shí)采取簡(jiǎn)單機(jī)械攪拌、高壓勻質(zhì)機(jī)共混以及用PA乳液代替水對(duì)PU預(yù)聚體乳化分散這三種方法實(shí)現(xiàn)了聚丙烯酸酯對(duì)水性聚氨酯的改性??疾炝瞬煌M分及PU/PA比例對(duì)丙烯酸酯改性水性聚氨酯復(fù)合乳液(PUA)粒徑、膠膜耐水性、漆膜硬度和乳液儲(chǔ)存穩(wěn)定性的影響。通過本研究采取的以聚丙烯酸酯乳液代替水進(jìn)行PU預(yù)聚物的分散方法,可以制得包敷PA粒子的PUA雜化乳液。制得的PUA雜化乳液擺桿硬度達(dá)到項(xiàng)
3、目要求的0.6以上,鉛筆硬度達(dá)到H以上。PUA雜化乳液涂膜耐水性較好,在水中浸泡一周以上,吸水率僅有0.8%。關(guān)鍵詞:水性聚氨酯;聚丙烯酸酯;改性:雜化;乳液SynthesesandPropertiesofPoIyurethane/PolyacrylateEmulsionsABSTRACTWater-bomepolyurethaneemulsionwaspreparedh·om2,4.toluene.diisocyanate(TDI),isophoronediisocyanate(IPDI),polyetherdiol(PPG),
4、dimethlyl01butanoicacid(DMBA),2-bu哆ne一1,4一di01(BDO)andetllylenedi鋤ine(EDA)throughself-emulsifiedmethod.Polyurethaneswithdiff.ere力tpropertiesweresynthesizedbvchangingthepolym嘶zationmethod,NCo/oHvalues,DMBAcontents.EDAcontentsandBDOcontents.Theefrectsofdif睡:rentcopolyme
5、rsandpolymerizationmethodsontheparticlesize,water-resistanceandhardnessofthePUnlmwereexploredinthispaper.PolyurethaneemulsionpaniclesweredemonstratedbVmeansofSEM,andt11emechanicalpropertieswasinvestigatedbymechanicalexpe—ment.InordertoimproVethepropeniesofPU,polyacyla
6、te(PA)emulsionwaSpreparedinthiswork,thenthePAemulsion鋤dPUdispersionwereblendedbythreemethods.Besides,themechanicalstirmethod,highpressurehomogeniser(HPH),theaqueousac巧lie-polyurethanehybridemulsions(PUA)werealSopreparedbythefollowingmethod:atthestageofdispersionforPUp
7、repolymer,thePAemulsionswereusedasdeionicwater.Also,theea’ectsofdi仃.erentparametersontheparticleslze,water-resistance,stabili妙,andhardnessofthePUAfilmwereinvesti2ated.ThestI.uctureofPAparticlesinsidethePUAhybirdparticlewaspreparedbythismethod.ThepenciIhardnessofPUAfil
8、mismorethanHanditsswinghardnessismorethan0.6.Aftersunl(int印waterformorethanoneweek,thewaterabsorptionofthePUAfilmisonly8%.Fi