Abstract
The process of long fiber reinforced reaction injection molding (LFR-RIM) was introduced in this paper, which was used to prepare Long glass fiber reinforced foam composite materials based on polyurethane, and the bending properties of the composites were studied by this experiment. The results show that the optimal combination of technology is basically the same through the range analysis of bending strength and elastic modulus of the products, that is the fiber content A=30%, fiber length B=25mm, mold temperature C=45 °C, mixture temperature D=30 °C, the module time E=12min, ratio of material A and material B F = 1:1.85, and through the verification of the optimal combination, the bending strength was 414.96Mpa, and the bending modulus was 17.81Gpa. Though the variance analysis of bending strength and modulus of elasticity, it is found that fiber content and fiber length is the most significant factor, and the mold temperature is the least significant factors.
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