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Yuan Lei tells you the effect of the properties of inorganic fillers on the performance of plastic products.

Release time:

2024-01-29 09:35

 

Yuan Lei tells you the effect of the properties of inorganic fillers on the performance of plastic products.

 

The nature of inorganic mineral fillers has many effects on plastic products, including physical and chemical composition and properties, particle size and distribution, particle shape and surface properties, as well as density, hardness, whiteness, etc., which have an impact on the performance and process parameters of plastics.

 

 

1. Geometric shape features

 

The effect of filler particles with different geometric shapes on the strength of plastic products is generallyFibrous> Sheet> Columnar> Cube> Spherical. Flaky filler helps to improve the mechanical strength of the product, but is not conducive to molding processing. On the contrary, the spherical filler can improve the molding processability of the product, but it may reduce its mechanical strength.

 

Geometry of inorganic fillers

 

2. Particle size and surface characteristics

 

Generally speaking, the smaller the particle size of the inorganic non-metallic mineral filler, the better the mechanical properties of the plastic under the condition of uniform dispersion. However, the reduction of the particle size of the filler also complicates the processing process and increases the cost.

 

In addition, the surface roughness and free energy of the filler particles also have an impact on the plastic manufacturing process. In actual production, it is required to reduce the surface free energy of the filler particles to avoid agglomeration between particles, thereby avoiding uneven product stress distribution.

 

3. Specific surface area

 

The larger the specific surface area, the better the affinity between the filler and the resin, but the more difficult the surface activation treatment of the filler, the higher the cost. However, for the same volume of filler particles, the rougher the surface, the greater the specific surface area.

 

4. Density

 

The particle size and distribution of different shapes are different. When the quality is the same, the apparent density of the particles with the same true density is not necessarily the same due to the different volume of the pile.

 

5. Hardness

 

High hardness can improve the wear resistance of products, but will wear processing equipment People do not want the benefits of using fillers to be offset by the wear of processing equipment. For a certain hardness of the filler, the wear strength of the metal surface of the processing equipment increases with the increase of the particle size of the filler, and the wear strength tends to be stable after a certain particle size.

 

6, color.

 

In order not to bring significant changes to the color of the filled material matrix or to adversely affect the coloring of the matrix,Most of the production requirements of the higher the better whiteness.

 

7. Oil absorption value

 

The oil absorption value of the filler affects the amount of plasticizing aid in the filling system and the processability of the material. The filler with low oil absorption value has good processability of the filling system, is easy to mix with the resin, and can reduce the amount of plasticizing additives. For similar inorganic mineral fillers of the same fineness,Surface organic modification can reduce the oil absorption value of inorganic mineral fillers.

 

8, Optical Performance

 

Some products can use the light absorption of fillers to increase the temperature, such as agricultural plastic greenhouses.

 

9. Electrical Properties

 

With the exception of graphite, most inorganic mineral fillers are electrical insulators.

 

10. Chemical composition

 

The chemical activity, surface properties (effects) as well as thermal, optical, electrical, magnetic properties, etc. of inorganic mineral fillers depend to a large extent on the chemical composition.

 

Learn from the different effects of different types of fillers on the product in the following table, and choose different fillers according to the required product characteristics.

 

Effect of some mineral fillers on the properties of plastics

 

11, Thermochemical Effects

 

High molecular polymers are easy to burn, but most inorganic mineral fillers, due to their own non-flammability, reduce the combustible substances after being added to the polymer matrix and delay the combustion of the matrix.such as magnesium hydroxide and aluminum hydroxideThe decomposition temperature is low, and water vapor and metal oxides are generated after decomposition, which has excellent flame retardant performance and does not produce toxic smoke, so it is an environmentally friendly flame retardant filler for polymer-based composites.

 

In short, the role of inorganic non-metallic mineral fillers in polymer composites can be summarized as increasing, reinforcing and imparting new functions. However, because the inorganic non-metallic mineral fillers and organic polymers have poor compatibility,Modification of inorganic non-metallic mineral fillers to improve their compatibility with organic polymers to avoid uneven stress dispersion caused by direct addition..

 

 

 

Quality pair, filler, inorganic, mineral, property, particle, influence, difference, surface, particle size

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