Compared with other general-purpose thermoplastics, PP plus talc has the advantages of low relative density, low price, good processability and good overall performance. Because it can be well blended with a variety of materials, it can simulate the performance of high-priced engineering resins at a lower price, and can be thinner and lighter, making it suitable for automobiles and electrical appliances in automotive and electrical materials applications. The demanding requirements of plastics have advantages. PP has the disadvantages of low temperature brittleness, low low temperature impact strength, poor rigidity, large molding shrinkage, and easy aging. PP plus talc powder can improve the heat distortion temperature of PP plastic, increase the dimensional stability of the product, reduce the molding shrinkage and increase the rigidity; the addition of superfine talcum powder masterbatch, as a reinforcing filler for polypropylene, can not only be remarkable Improve the rigidity, surface hardness, creep resistance and electrical insulation of polypropylene products, and also improve the impact strength of polypropylene, improve the impact resistance of PP, and impart excellent surface properties to the system; talcum powder also has melt flow promotion The role of the agent, as well as synergistic agents with certain flame retardants. When a small amount of talc is added to propylene, it can act as a nucleating agent to refine grains and improve the crystallinity of polypropylene, thereby improving various mechanical properties of polypropylene and improving transparency. The effect of surface modification of talc on PP enhancement performance: After the talc powder is treated by coupling agent, the reinforcing performance of PP filling is obviously improved; various coupling agents have great difference in PP strengthening effect, among which silane is the most Well, the phosphate ester is inferior, and the combination of silane and titanate is also effective, which may be related to the synergistic effect of the two. Effect of stone powder particle size on PP reinforcing properties: The particle size of talc powder is an important factor in the preparation of filled PP composites. As the particle size of talc decreases, the surface area increases and the reinforcing properties of the powder increase. It is because the surface defects of small particles are relatively small, the possibility of physical and chemical bonding with PP is large, and the interface bonding performance is good. Under the impact of external force, more micro-cracks and plastic deformation will occur, but further ultra-fine, so that The surface of the powder is significantly enlarged, the interaction between the particles is too strong, and the powder tends to agglomerate, which affects the dispersibility in the PP. When the amount is less than 15%, the strength of the composite increases with the increase of the amount of talc, and when it is more than 15%, it decreases. This is mainly because the filling amount of talcum powder is too small, the dispersion concentration is too low, and the main body that absorbs external stress is PP matrix, which can not play a significant role in strengthening and toughening; when the filling amount is large, the particles are too close to each other due to limited The matrix is ​​not enough to wrap all the particles, the interface bonding condition is reduced, and the bonding defects occur. When the material is impacted, the microcracks and plastic deformation are too large, and the macroscopic cracking is almost caused, resulting in a decrease in strength. Adhesion between talc and PP: The dynamic viscosity of PP system filled with ultrafine talcum powder modified by different coupling agents has a big difference. The effect of silane coupling agent is ideal. The modified talc powder is filled with PP. The dynamic viscosity of the system is significantly reduced, improving compatibility with PP. The adhesion between talc and PP has a good correspondence with the tensile strength of the composite. The greater the adhesion, the better the mechanical properties of the material. When the talc mass fraction is 20%, the tensile strength of the composite increases, while the higher mass fraction decreases. With 10% talc and no MAPP, the maximum strength is increased by approximately 5%. The chemical coupling agent of talc particles and PP matrix has a suitable influence on the tensile properties through the MAPP coupling agent. The optimum mass fraction of MAPP is about 1.5-3.0%. When the mass fraction of the MAPP resin is 1.5%, the tensile strength of the PP-30% talc powder is increased by about 10%. In the case of larger frequency ratios, studies on the flow properties of the composites show that the rheological properties of the talc are generally reduced. By increasing the talc mass fraction to 50%, the flow index will decrease, even lower than the reference PP value. The movement of the crossover frequency represents a change in the properties of molecular mobility and relaxation time. The crossover frequency of the composite is almost the same, the talc mass fraction reaches 30%, and when the filler loading is higher, the amount is reduced because the filler particle network has polymer molecular mobility and its The effect of relaxation time. The appropriate amount of crosslinking agent is related to the crossover frequency of the composite and the minimum of the crossover coefficient. Talc has become an important inorganic mineral filler for plastic modification, and has received attention in the research and application of filled modified polypropylene (PP) plastics. There is research space for the development of talc-filled modified PP plastics. The talc powder is filled with modified PP to improve its quality. It has a huge market prospect in the fields of automobiles and electrical appliances. Talc powder is a commonly used mineral powder filler for PP polypropylene plastics, and has received extensive attention due to its abundant resources, low price and excellent filling performance. Talc-filled composites have been widely used in the automotive industry and daily necessities. Their products have good apparent quality, low shrinkage and high heat distortion temperature compared to unfilled talc. However, due to the two-phase interface Affinity is not strong. Direct filling of talc often leads to some degradation of mechanical properties, which limits the application of composites. Surface modification treatment can effectively improve the interfacial affinity of talc powder and polymer, improve the wetting ability of polymer to talc powder, improve the dispersion state of talc powder filler in polymer matrix, and improve the composite material. Physical and mechanical properties. There have been many studies on the enhanced properties of mineral powders at home and abroad, and a large number of analyses have been carried out on their enhancement mechanisms. Some models have been developed for the proposed mechanism. These studies have promoted the theory of mineral particle reinforced polymer composites. Practical application. PP plus talc composite has been widely used in the production of automotive parts and daily necessities. Its products have good apparent quality, low shrinkage and high heat distortion temperature compared with PP without talcum powder. The affinity of the two-phase interface is not strong, and the direct filling of the talc powder often leads to a decrease in some mechanical properties, thereby limiting the application of the composite material. Surface modification treatment can effectively improve the interfacial affinity of talc powder and polymer, improve the wetting ability of polymer to talc powder, improve the dispersion state of talc powder filler in polymer matrix, and thus improve The physical and mechanical properties of the composite. There have been many studies on the properties of mineral powder-reinforced PP at home and abroad. A large number of analyses have been carried out on its enhancement mechanism, and some models have been established for the proposed mechanism. These studies have promoted the preparation of composite materials by mineral particle reinforced polymer. Theoretical and practical applications. However, these studies are based on the structural analysis of composite materials, the properties of mineral powders, and the amount of fillers. For example, the relationship between material strength, elastic modulus, rheological properties and mineral powder loading is established. The complexity of the interaction between mineral particles and the polymer matrix is ​​neglected, and this factor is crucial for explaining the enhancement of mineral powder and understanding the application performance of the composite. Application of PP plus talc automotive special materials Automotive is the main development direction of energy saving, environmental protection and low cost. Plasticization of automotive materials is one of the keys to achieve this direction. Polypropylene modified materials are increasingly used in automotive parts due to their light weight, low cost, easy processing, mature products, recyclable, and excellent comprehensive properties. At present, with the improvement of the manufacturing level of PP special materials, the application of modified PP in automobiles will be more extensive. The leading products are PP modified special materials for manufacturing bumpers and instrument panels. Modified PP bumper special materials Among the auto parts made of modified PP, the front and rear bumpers are one of the most representative and largest parts. PP/EPDM, which is commonly used in the world today, is used as a bumper material. Foreign polypropylene car bumpers have developed rapidly. At present, more than 90% of models use plastic bumpers, of which about 70% use elastomer-modified polypropylene bumpers, and Japanese polyolefin companies in PP/SEBS/POE/ Bumper made of talc/PP graft composite with high impact strength and excellent coating properties. PP plus talcum powder instrument panel special material instrument panel is one of the main automotive interior parts. At home and abroad, the method of rubber toughening and inorganic filling strengthening of PP is widely used, so that the instrument panel with PP has high rigidity and high toughness. . Inorganic fillers or reinforcing materials are: talc, mica and glass. Currently used dashboards can be divided into hard gauges and soft gauges. Talc modified PP is mainly used to form the skeleton of hard instrument panels and soft instrument panels. The polymer type interface compatibilizer was prepared by melt grafting method, and applied to the blending system of PP and talc powder, and toughening agent (POE) was added to the blending system for toughening. The results show that the compatibilizer exerts a good compatibilizing effect, and the PP/talc powder blending system is strengthened and toughened under certain conditions, and compared with the PP vehicle dashboard special material without the compatibilizer. Both strength and impact strength are greatly improved. The instrument panel is required to have high impact strength and toughness. The impact-modified talc powder with high EPDM content is used to enhance PP. It can be used in the dashboard of a car, and its surface quality is good and easy to shape and process. It is also a common practice to adopt a composite reinforcement method, such as calcium carbonate/talc composite reinforced PP.
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3 application range
PP plus talcum powder
The superior performance of talc filler The inorganic filler plays an important role in plastic modification and becomes an indispensable modifier. In different application fields, talc has been recognized as an extender, enhancer and functional modifier in the industry. This is inseparable from the characteristics of the talc itself: the connection between the layers is weak, making it soft, reducing the wear on the equipment during processing; the sheet structure can give the best balance between the stiffness and impact strength of the filling system; It has a certain affinity for organic matter; the surface of talc is both hydrophobic and inert; higher whiteness. However, the compatibility between the filler and the plastic matrix is ​​poor, which affects the final properties of the system. In order to improve the interfacial organic bond between the two, the surface of the talc must be modified.