What are the main improvement methods of polypropylene PP granules?


Release time:

2023-02-10

Polypropylene PP particles are an odorless, tasteless and Milky White high-crystalline polymer. They have good dielectric properties and high-frequency insulation. They are not affected by humidity, but they become brittle at low temperatures, are not wear-resistant, and are easy to age. In order to improve the defects of polypropylene PP particles, it is modified through technological innovation and experience accumulation to meet the needs of different customers.

       PP Polypropylene GranulesIt is an odorless, tasteless milky white high-crystalline polymer with good dielectric properties and high-frequency insulation. It is not affected by humidity, but it becomes brittle at low temperature, is not wear-resistant, and is easy to age. In order to improve the defects of polypropylene PP particles, it is modified through technological innovation and experience accumulation to meet the needs of different customers. The modification of the material is mainly to add a variety of modifiers, additives, fillers and pigments and other components, and then the modified polypropylene PP granular material in the screw extruder extrusion granulation. The properties of the material after curing are suitable for the production and application of specific products, and can be directly used in the production of extrusion, injection molding, blow molding and other products. Colleagues can be widely used in automotive interior and exterior parts, home appliances, mechanical parts and other fields.

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PP Polypropylene Granules

The main improvement methods are as follows:

1. Fill

Polypropylene filling modification is to add inorganic fillers or organic fillers in the plastic molding process to reduce the raw material cost of plastic products, achieve the purpose of incremental, or significantly change the performance of plastic products.

FillPP Polypropylene Granuleshas the following characteristics

1) Reduce costs: inorganic fillers, such as calcium carbonate, talc, etc. are relatively cheap;

2) Improve heat resistance: Ordinary PP is difficult to meet the heat resistance requirements of plastic products. Adding inorganic fillers is an effective way to improve the heat resistance of PP. For example, the thermal deformation temperature of PP plus talc can reach 130 ℃;

3) improve the rigidity: general PP bending modulus of about 1000MPa. By adding inorganic filler, its flexural modulus can reach 2000 ~ 3000MPa, which has obvious rigidity reinforcement effect.

4) Reduce molding shrinkage: Improve dimensional stability: PP is a crystalline polymer, the shrinkage rate is relatively large during the molding process (shrinkage rate is 1.5%~ 2.0%), which is prone to post-crystallization, resulting in warping and cracking of manufactured parts. In order to reduce the molding shrinkage and improve the dimensional stability, adding inorganic filler is an effective means, such as adding 30% talcum powder, the molding shrinkage can be reduced to about 1%;

The mineral processing aids used for PP plastic modification mainly include calcium carbonate, talc powder, mica powder, etc. Their influence on the shrinkage rate of PP plastic molding process is obvious. In three aspects, the mineral filler itself does not shrink, the addition of mineral filler reduces the overall shrinkage of the polypropylene modified material, and the addition of mineral filler affects the crystallinity of polypropylene; third, the addition of mineral filler plays the role of nucleating agent, changes the structure of polypropylene, increases the formation of spherulites, and affects the shrinkage of polypropylene.

When the glass fiber content is more than 30%, the shrinkage of PP is reduced from 1.8 to 0.5. And the effect of surface treated glass fiber on molding shrinkage is greater than that of untreated glass fiber. The addition of glass and fiber destroys the crystallinity of PP and affects the shrinkage of the enterprise, while the addition of fiber to glass can limit the shrinkage of PP plastic at the crystallization temperature.



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