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The inevitability and development trend of filling active materials in plastics

Date:2018-09-12




 
Plastic filling modification is the compounding of fillers with plastics and resins. Generally, the filling amount of fillers is large, sometimes even hundreds of parts. Therefore, fillers are important and indispensable auxiliary materials in the plastics industry. In general, the consumption of fillers in the world accounts for more than 15% of the weight of plastics, which shows that the consumption is huge. Plastic filling modification has several advantages:

One: reduce the cost Generally, the filler is cheaper than the resin, so the filler can greatly reduce the cost of the plastic, and has obvious economic benefits, which is also the main reason for the wide application of plastic filling modification.

Second: improve the heat resistance of plastics. Generally, plastics have low heat resistance, and most fillers are inorganic materials with high heat resistance. Therefore, when these fillers are added to plastics, the heat resistance of plastics can be significantly improved. . All mineral fillers have this function.

Three: Improve the rigidity of plastics Generally, the rigidity of plastics is poor, which is far from meeting the requirements of processing parts. After adding certain fillers, the flexural modulus is significantly improved. It can be seen that plastic has obvious effect of increasing rigidity. Such as: (active) whisker silicon.

Four: Improve plastic molding processability Some fillers can improve the processability of plastics, such as: (active) hollow microspheres, (active) ceramic microbeads and other materials, good mobility is its main feature, filled in plastic, can be greatly Improve the fluidity of the resin to improve its processing properties, making it easy to process complex components.

V: Improve the dimensional stability of plastic products and parts. Some plastics have large crystal shrinkage, which leads to large shrinkage of the products. It is easy to deform and out of size after coming out of the mold. When the filler is added, the shrinkage rate of the plastic can be greatly reduced, thereby improving Dimensional stability of plastic articles and their components, in particular: (active) hollow microspheres, (active) ceramic microbeads, and the like.

Six: Improve the hardness of plastic surface Generally, the hardness of plastic is low, the surface is easy to scratch, affecting the appearance, thus affecting its surface effect and decoration. The hardness of the inorganic filler is higher than that of the plastic. After adding the inorganic filler, the hardness of the plastic surface can be greatly improved, for example, using (active) whisker silicon.

Seven: Increase the strength of the general plastic itself is not high tensile strength, after filling the inorganic filler, within the appropriate amount of filling, can increase the tensile strength and bending strength of the plastic, thereby providing engineering use of plastic, such as: (active) Whisker silicon.

Eight: Give certain properties to plastics and increase the added value of plastics. Some fillers can impart some functions to plastics. For example, PP can improve the antistatic properties and printing properties of PP after adding nano-active calcium carbonate. After adding hollow beads to plastics, It can improve the thermal insulation performance of plastics; metal ions can improve the thermal conductivity and electrical conductivity of plastics when added to plastics.

Nine: Eliminate floating fiber and improve the surface finish of plastic products

The active hollow microspheres and the active ceramic microbeads have good flow properties and can be well dispersed in the resin system, especially for plastic glass fiber reinforced modification, which complements the glass fiber properties and eliminates the glass fiber exposure, so that the product The surface is smoother and the processing performance is superior.

In short, the filling modification of plastics has many advantages and has been widely used, but it should also be noted that the problems caused by excessive filling modification, such as: general impact strength reduction, surface gloss reduction, color saturation Decrease, the intensity is greatly reduced after the filling amount is too large. These shortcomings are fully considered when designing the formula. Do not blindly increase the amount of filling to reduce costs, to consider the product's usability and long-term retention of performance. For this reason, the use of a coupling agent for surface treatment of the filler material is applied, which makes up for the disadvantages of small addition ratio of inactive filler material, low strength of plastic products, poor toughness, and poor processing fluidity.

The powder filler is prepared by using a coupling agent for surface treatment. It is a new functional material that should be developed in response to the needs of modern high-tech and new materials industries, especially the development of functional materials. It meets the needs of modern society for environmental protection, energy conservation, safety and health. It is the most promising functional powder material. The filling of plastics is even more inevitable.

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