The shrinkage rate control/manufacturing of PP polypropylene modified materials is an important aspect of polypropylene modification. The shrinkage rate control/manufacturing is of great significance to the promotion and use of polypropylene modified materials, and is also an important aspect to ensure product quality. In particular, the use of modified polypropylene to replace traditional engineering plastics, shrinkage is very important. The following Jialixin modified PP will explain the influence of shrinkage on minerals, glass fiber, polyethylene and molten fat. Effect of Mineral Filling on Molding Shrinkage of Polypropylene PP Modified Plastics The mineral additives for polypropylene PP are mainly calcium carbonate, talc, mica powder and the like. The effect of various mineral fillers on the shrinkage of polypropylene molding shows that the influence of mineral fillers on the molding shrinkage of PP modified materials is obvious. The influence of mineral filler on the shrinkage of polypropylene modified material has three main aspects: First, the mineral filler itself does not shrink, and its addition reduces the shrinkage of the polypropylene modified material from the overall proportion; The addition of mineral fillers will inevitably affect the crystallinity of polypropylene, thus affecting the shrinkage rate. Third, after the addition of fine mineral agents, it acts as a nucleating agent, changing the structural state of polypropylene, preventing large balls. The formation of crystals also affects the molding shrinkage of polypropylene. Effect of Glass Fiber on Molding Shrinkage of Polypropylene PP Modified Plastics Glass fiber has the greatest influence on the shrinkage of polypropylene PP modified material. When the content of the glass fiber reaches 30% or more, the molding shrinkage of the polypropylene modified material decreases from 1.8 to 0.5, and the surface-treated glass fiber has a greater influence on the molding shrinkage than the untreated glass fiber. The addition of glass fiber breaks the crystallinity of polypropylene, affects the shrinkage rate, and more importantly, the glass fiber limits/crystal shrinkage of polypropylene. Effect of polyethylene addition on shrinkage of polypropylene molding The addition of polyethylene also affects the molding shrinkage of the polypropylene modified material. Although polyethylene is also a high crystallinity plastic, the molding shrinkage rate is also large. However, after being added to the polypropylene, the respective crystallinity is broken or broken to a different extent, and the overall molding shrinkage rate is lowered. Effect of changes in polypropylene's own MI (molten fat) on molding shrinkage The molding shrinkage of polypropylene is affected by its crystallinity, which in turn is affected by its own molecular weight. When MI is increased, the molecular weight is decreased, the crystallization rate is increased, and the molding shrinkage rate is increased. When the polypropylene MI changes, it also has a certain influence on the molding shrinkage rate. Personal experience suggests: glass fiber, minerals, elastomers, polyethylene, MI on the shrinkage rate of PP modified plastics in the order: glass fiber > minerals > elastomer > polyethylene > MI. 2: Changing the crystallinity of polypropylene is the key to controlling the shrinkage of polypropylene modified materials. Vde Wire Stripper,Vde/Gs Certificate Plier,Custom Vde Wire Stripper,En60900 Approved Wire Stripper Shanghai Countool In't Trading Co.,ltd , https://www.countool.com
Analysis of Shrinkage Rate of Polypropylene pp Modified Plastics
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