The preparation and performance of polypropylene (PP) composites is a hot topic at home and abroad, and PP composites not only reduce the cost of materials, but also significantly improve the comprehensive properties of materials.
If bagasse (BF) is added to PP to make composite materials, it will better reflect the environmental protection value of composite materials.
Nano calcium carbonate is a new type of inorganic material and a strong reinforcing agent. Because of its small size and large specific surface area, it has become a hot spot of development and research in recent years.
If the nano-calcium carbonate is combined with PP, it can effectively show the internal stress it bears, and can enhance the toughness of the polymer. However, due to the polar surface of calcium carbonate, the compatibility with non-polar polymers is extremely poor. Therefore, when PP is filled and modified with calcium carbonate, the comprehensive performance of the composite material will decrease. modified.
The results of surface modification of nano-calcium carbonate by titanate coupling agent and aluminate coupling agent were obtained. After modification with aluminate, the dispersibility was better and the whiteness increased. However, the price of nano-calcium carbonate modified with titanate coupling agent is high, and there is a danger of harming human health, and the whiteness of the modified product decreases.
By using aluminate coupling agent to modify nano-calcium carbonate, the effect of nano-calcium carbonate content on the structure and properties of PP/BF composites was known. The results showed that:
(1) The addition of nano-calcium carbonate increases the mechanical properties of the composite material. When the mass fraction of nano-calcium carbonate is filled with 9%, the mechanical properties of the PP/BF/nano-calcium carbonate composite are the best, compared with those without nano-carbonic acid. With calcium, the tensile strength increased by 20.7%, the flexural strength increased by 14.6%, and the notched impact strength increased by 20.0%.
(2) The filling of nano-calcium carbonate basically has no effect on the chemical structure of the composite material, and no new chemical bonds are generated.
(3) With the addition of nano-calcium carbonate content, the thermal stability of PP/BF/nano-calcium carbonate composites also increases gradually.
(4) Adding a certain amount of nano-calcium carbonate improves the surface compatibility of PP/BF/nano-calcium carbonate composites. When the mass fraction of nano-calcium carbonate is 9%, the Compatibility and dispersion of nano calcium carbonate are the best.
(5) This material is used in the production of special materials for automobiles, which increases the rigidity, toughness, bending strength and other mechanical properties of modified plastics, and also endows plastics with thermal hysteresis, which effectively reduces the production cost of economical automobiles.