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——反应注塑的增强塑料车身外部板件,比金属制的具有多方面的显著优越性——杰斐逊化学公司的研究人员正在对反应注塑的增强尿烷塑料汽车车身外部板件作出评价。这种材料制造的车身零件,比金属轻而且耐腐蚀,其强度和热膨胀问题现在正进行解决。反应注塑法(R.I.M.)是模塑制造大型塑料零件、并能迅速熟化的一项新技术。这种工艺被认为宜于用来模塑尿烷塑料的大型汽车零件。在反应注塑过程中,将两种能强烈起反应的塑料组成物在高达13.8兆帕(2000磅/吋~2)的压力下分别喷射到混和室内,它们彼此在冲击作用下被混合。其中喷入的一股组成
- Reactive injection molding of reinforced plastic body panels provides significant benefits over metal in many aspects - Researchers at Jefferson Chemical are evaluating reactive injection molded exterior panels of urethane plastic automotive bodies. Body parts made of this material are lighter and more corrosion resistant than metals, and their strength and thermal expansion problems are now being addressed. Reaction Injection Molding (R.I.M.) is a new technology for molding large plastic parts that can be rapidly aged. This process is considered suitable for large automotive parts used to mold urethane plastics. During reaction injection molding, two strongly reactive plastic compositions are injected into the mixing chamber at pressures up to 13.8 MPa (2000 psi), respectively, and they are mixed with one another under impact. Which injected into the composition