【作者】 罗华；

【导师】 莫健华；

【作者基本信息】 华中科技大学 ， 材料加工工程， 2005， 硕士

【摘要】 快速成形制造技术(RP&M)是20 世纪80 年代末期开始商品化的,是将计算机辅助设计(CAD)和计算机辅助制造(CAM)、计算机数字控制(CNC)、激光、等先进技术和新材料集于一体的一种高新制造技术,因其成本低,速度快、效率高,具有极大的市场应用价值,近年来在制造业和学术界引起了极大关注。利用成形制造技术间接快速制造模具,或者直接快速制模具,便产生了基于快速原型的快速模具制造技术(RT)。快速成形材料是RP&M 技术发展的关键环节。聚氨酯树脂材料(PU)由于适合室温真空双组分浇注工艺, 其制品综合性能优异,因而被广泛的运用于RP&M 和RT中,它是快速成形制造技术中的一种重要的成形材料。然而普通聚氨酯耐热性能较差,一般在80℃以下能长期使用,短期使用温度则不超过120℃。因此研究适合真空浇注工艺的高性能耐热聚氨酯树脂材料具有重大意义。本文以二异氰酸酯(4,4’-二苯甲烷二异氰酸酯MDI; 4 ,4’-二环已基甲烷二异氰酸酯H12MDI),低聚物多元醇(聚醚多元醇TMN; 聚酯多元醇CAM) ,小分子交联扩链剂,催化剂及助剂,采用半预聚法合成了5 个系列耐热聚氨酯树脂材料。用红外光谱(FTIR)表征了结构,用X 射线衍射分析了微观结构,用差示扫描量热(DSC)法,热失重(TGA)法对其热稳定性进行了分析测试,对力学性能也进行了测试。结果表明合成的聚氨酯材料具有较高的耐热性能和优异的力学性能,能够替代某些工程塑料被运用于更广泛的领域。更多还原

【Abstract】 Rapid Prototyping & Manufacture (RP&M) technology was commercialized in the eighties of the twentieth century , It is a new and advanced manufacture technology which is composed of CAD、CAM、CNC、laser、Materials and so on. Low costs,high speed and high efficiency endow it with great value in the intensive competition in the market, so it has attracted great attention in the fields of manufacture industry and academy. Rapid Tooling (RT) is another important technology founded on RP&M, rapid tools or molds can be manufactured rapidly by RT. Materials is one of the most pivotal factors used in RP&M . Polyurethane resin (PU) is an important materials and used widely for Vacuum Casting manufacture because of its convenient process and high performance . But Casting Polyurethane resin (CPU) can not be used as material on the fields of high temperature, so study of CPU with heat resistance , used for Vacuum Casting manufacture, became very significant, and was done the thesis. Series of casting polyurethane resins (CPU) were synthesized by using 4.4’-methylene diphenyl dissocyanate (MDI), cycloaliphatic diisocyanate (H12MDI), polyols, crosslinking agent, catalyst and special aids, and they were prepared by semi-prepolymerization. Their structures were studied by FTIR,and domain structures were studied by WAXD. the thermal stabilities of CPU were examinated by DSC and TGA . The mechanical properties of CPU were measured , the results show that they have high thermal stabilities and excellent mechanical properties. It can be used as material on the fields of high temperature, high impact strength, etc.更多还原