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Microporous injection molded article having a solid core of the epidermis, and 5 to 50 microns internal foamed structure can enhance the impact strength of the product, reduce product quality, and tensile properties decreased small, can reduce the filling pressure of the molding process, reduce energy consumption, widely used in engineering structural components. Due to the process, a combination of the two parts of the control of the injection molding, and the supercritical fluid, forming complexity than conventional injection molding, feasible processing range is limited, the production and quality stability of the microporous article is not easy to guarantee, wherein the process parameter is a major one of the factors. Orthogonal experiment method of process parameters on the microporous mechanical properties of injection molded articles, the first comparison microporous injection products and solid products (traditional products) weight, performance differences; computational analysis of the various process parameters on the corresponding molding products the extent of the impact of the mechanical properties; of microporous injection and traditional injection molding process parameters difference. : A basis for the design of the L 18 orthogonal table, complete the preparation of microporous products and the preparation of solid PC injection products using supercritical nitrogen and polycarbonate (PC GE-HF1130) . Two to using AY120/AY220 electronic balance to measure the weight of the products found: microporous injection products lighter than a conventional injection molding products, weight reduction of up to 25%, at least 6%, and the average 13%. According to GB / T 16421-1996, GB/T12460-1996, use of electronic universal testing machine and Izod impact testing machine, molding injection products under different conditions to complete the tensile strength, impact strength and other mechanical properties test. The experiments show that: the impact strength of the microporous products is 2.54 times the conventional injection molding PC products; tensile strength and elastic modulus were 83% and 90% of the traditional injection molding products. The variation of the process parameters, can cause a 29% change in tensile properties, impact properties, 25% change. Using orthogonal table is found, in descending order of different process parameters on the degree of impact strength: mold temperature, injection speed, SCF ratio of the melt temperature, back pressure, pre-plastic amount; pull The tensile strength of the strength of the order: SCF ratio, melt temperature, injection speed, back pressure, the amount of pre-plastic mold temperature. Solid injection products, impact strength impact strength of the order of packing pressure, mold temperature, cooling time, melt temperature, injection speed, injection pressure; affect the strength of the order of the tensile strength of the cooling time, mold temperature, injection pressure, holding pressure, injection speed, melt temperature.
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