Glass fiber reinforced co-polypropylene composite material and preparation method of the Glass fiber reinforced co-polypropylene composite material

Abstract

The invention discloses a glass fiber reinforced co-polypropylene composite material and a preparation method of the glass fiber reinforced co-polypropylene composite material. The preparation method includes the steps as follows: uniformly mixing co-polypropylene, polypropylene grafted with maleic anhydride, homopolymerized polypropylene organic peroxide initiator, and antioxidant in proportion;adding the mixture in a double-screw extruder and simultaneously adding glass fiber strand roving; and conducting melt extrusion for granulation at the temperature of 170-220 DEG C, thus obtaining the glass fiber reinforced co-polypropylene composite material, wherein the melt index of the obtained composite material is 18-35g / 10min, the tensile strength is 49-89 Mpa, the breaking elongation is 9-35%, the Young modulus is 2.3-5.3GPa and the notch impact strength is 10-33kJ / m2. The glass fiber reinforced co-polypropylene composite material provided by the invention has not only outstanding strength, modulus, and impact resisting and heat resisting properties, but also excellent processing flow property, and can injection-mold and form thin-wall products with attractive appearance and complex shape; and the glass fiber reinforced co-polypropylene composite material has the characteristics of being light in weight and cheap in cost can substitute for engineering plastics such as expensive ABS (Acrylonitrile Butadiene Styrene) and nylon.

Description

technical field [0001] The invention belongs to the technical field of glass fiber reinforced polypropylene (PP / GF) composite material and its preparation, and in particular relates to a glass fiber reinforced copolymerized polypropylene composite material with high strength, high modulus, high toughness and excellent processability and its preparation method. Background technique [0002] Polypropylene has rich raw materials, simple synthesis process, low price, good overall performance of resin, and wide range of uses. It is a very important general-purpose plastic. However, polypropylene has poor low-temperature toughness, strong notch sensitivity, and low mechanical properties, which also limit its application on functional structural parts (Wang Duoren, Synthetic Resin and Engineering Plastics Production Technology, Beijing, China Light Industry Press, 2001, 8). [0003] Although glass fiber reinforced polypropylene greatly improves the tensile strength, modulus and h...

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Problems solved by technology

However, because the matrix resin of traditional glass fiber reinforced polypropylene generally adopts homopolypropylene (Liu Xue, Zhuang Hui, Cheng Yongfeng, Research on the performance of long glass fiber reinforced PET engineering plastics. Plastic Industry, 2006, 34 (12): 26-28; Thomasset J, Carreau P J, Sanschagrin B, et al. Rheologleal properties of long glass fiberfilled polypropylene. JNon-Newtonian Fluid Mech, 2005, 125: 25-34; Wang Hongzeng, Li Rongxun, Liu Baocheng,. Reinforced polypropylene automotive engine fan Development of modified materials, Plastic Science and Technology, 2005(6): 32-35; Zhang Ning, Li Zhongheng, Tao Yu, Research on long glass fiber reinforced polypropylene composite materials, Plastic Industry, 2006, 34(12): 29- 32; etc.), so that the prepared glass fiber reinforced polypropylene material still has certain performance defects:

[0004] 1) Due to the low notched impact strength of the homopolypropylene used, it is only ~5kJ / m 2 , although the impact strength has been improved after adding glass fiber, the toughness of the material, especially the notched impact strength and elongation at break, is very limited, and it still cannot meet the requirements of some functional structural components.

[0005] 2) Due to the high viscosity of glass fiber reinforced polypropylene melt, especially when the glass fiber content is high, the fluidity is poor and it is not easy to injection molding

[0006] 3) Due to the poor compatibility between the added glass fiber and homopolypropylene, glass fiber often floats on the surface of the product in the prepared glass fiber reinforced polypropylene product, causing the "floating fiber phenomenon" and seriously affecting the product. Exterior

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