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1、低温免清洗卷專中溶剂的优院_系：理学院冶金系专业：冶金工程年级：学生姓名：学号：导师及职称:20XX年4月摘要本文研究的助焊剂是一种低松香的助焊剂，也称免清洗助焊剂。根据免清洗型助焊剂中溶剂的作用和特点，确定好助焊剂中溶剂的种类，并在低温178°C的条件下做单一溶剂实验和正交试验。实验过程中以Sn-Bi无铅焊膏的铺展性能作为评价指标，通过焊接实验，对溶剂进行优化研究。溶剂的选择对助焊剂的性能至关重要，不仅要保证能够溶解有机酸，同时还要对焊接面有很好的保护作用。实验根据沸点、粘度、焊接温度和含有极性基团等因索初选出四种符合条件的溶剂，所选出的溶剂由三种醇（四氢糠醇
2、、异戊醇、乙二醇）和单一瞇（乙二醇丁瞇）组成。首先对单一溶剂进行焊接实验，接着分别做四因素三水平和三因素二水平复配溶剂的正交实验，再分别计算出其铺展率并绘出单一曲线图和复配曲线图。结果表明：单一溶剂实验时，界戊醇配制出来的焊膏铺展率是最高的，可达75.58%,,而四因素三水平的正交实验时，当（四氢糠醇：异戊醇：乙二醇：乙二醇丁储）为2:3:1:2时得到的焊膏性能最优，焊膏铺展率高达81.82%,在三因素二水平的正交实验吋，当（四氢糠醇：异戊醇：乙二醇丁储）为2:1:2吋得到的焊膏性能最佳，其铺展率达到83.18%。关键词：溶剂；低温；优化研究；免清洗ABSTRA
3、CTFluxofthisstudyisalow・rosinflux,alsocalledno-cleanflux.Accordingtotheroleandcharacteristicsofno-cleanfluxsolvent,determinethetypeofgoodfluxsolventandatlowtemperatureof178°Ctodoasinglesolventandorthogonalexperiment,experimentwithlead-freesolderSn-Bispreadingperformanceevaluationasby
4、weldingexperiments,solventoptimization.Thechoiceofsolventiscriticaltotheperformanceofflux,notonlytoensurethatitcandissolveorganicacids,butalsotohaveagoodweldsurfaceprotection.Experimentalprimariesaccordingtoboilingpoints,viscosity,temperatureandfactorsweldingpolargroups,whichcontaina
5、fourqualifiedsolvent,thesolventbeingselectedfromthethreetypesofalcohol(tetrahydrofurfurylalcohol,isoamylalcohol,ethyleneglycol)andasingleether(ethyleneglycolbutylether)composition.Firstexperimentsonsinglesolventweldingexperimentsweredonethenfourfactorsandthreelevelsandthreelevelsofco
6、mplexfactorsthattwoorthogonalsolvents,andthenitspreadrateswerecalculatedandplottedgraphsandcomplexsinglegraph.Theresultsshowedthat:asinglesolventexperiments,isoamylalcoholformulatedoutofsolderpastespreadingrateisthehighest,up75.58percent“whilethefourfactorsandthreelevelsorthogonalexp
7、eriment,whenthe(tetrahydrofurfuryl:isoamylalcohol:Bglycols:ethyleneglycolbutylether)is2:3:1:2togetthebestperformanceofsolderpaste,solderpastespreadingrateofupto81.82%,inthethreefactorsandtwolevelsorthogonalexperiment,whenthe(tetrahydrofurfurylalcohol:isoamylalcohol:ethyleneglycolbuty
8、lether)is2:1
