Yuan Lei little knowledge | The application of barium sulfate in general plastics and engineering plastics

Release time:

2024-04-01 13:43

Barium sulfate has the advantages of strong chemical inertness, good stability, acid and alkali resistance, moderate hardness, high specific gravity, high whiteness, absorption of harmful rays, etc., so it is used in various plastics, rubber, coatings, ink, chemical industry, paper making, ceramics, pigments and other fields. It can increase the hardness and strength of products, improve the performance of heat and wear resistance, and is one of the more promising functional fillers. The following is to introduce the application of barium sulfate in the modification of general plastics and engineering plastics.



"Filling modification of barium sulfate in general purpose plastics

General plastic has the advantages of good formability and cheap price, but its disadvantages such as easy aging and easy deformation bring a lot of inconvenience to use. In order to overcome these shortcomings, it can be improved by modifying and adding auxiliaries to meet the needs of practical applications. The application of barium sulfate in general plastics is one of the research hotspots in recent years.

High gloss PP composites were prepared by uniform design method with ultrafine modified barium sulfate and nucleating agent. The tensile strength, bending strength, bending modulus and impact strength of the cantilever beam were investigated. The results showed that the high gloss PP prepared with 2.0‰ nucleating agent content and 28.0% filling content of modified ultra-fine barium sulfate were comparable to those of imported products.

PVC/MBS/ nano-barium sulfate ternary composite was prepared by melt blending method, and its mechanical properties and thermal stability were investigated. The results show that MBS and nano-barium sulfate can synergistically toughen PVC. When the content of MBS and nano-barium sulfate is 10% and 1% respectively, the toughness and rigidity of the material can be improved at the same time, and the impact section shows typical ductile fracture characteristics. Thermogravimetric analysis shows that the addition of 1% nano-barium sulfate can improve the thermal stability of PVC/MBS.

By the method of wet reaction modification, the surface of barium sulfate was changed from hydrophilic to lipophilic by embedding long carbon chain molecules of stearic acid on its surface during the precipitation reaction stage. Therefore, the dispersibility of barium sulfate in polyvinyl alcohol solution can be improved, and the mechanical properties of PP can be improved by using barium sulfate as filler.



"Filling modification of barium sulfate in engineering plastics

With the increasing progress of modern science and technology, society has put forward multi-functional requirements for engineering plastics. If the engineering plastic material is required to have both good toughness and good hardness; It should have both good rigidity and good impact strength. It is necessary to have good comprehensive performance and low price. For diverse requirements, a single resin is difficult to meet the requirements of diversity and high quality, and plastic modification can turn this limited single resin into a multi-functional new material, so as to meet the needs of different fields. There are many ways to modify engineering plastics, such as blending modification, filling modification and so on. Among them, filling modification is a common method used by enterprises, not only because it gives plastics new functions (such as aging resistance, conduction, heat resistance, etc.) and new properties (improve impact strength, tensile strength, elastic modulus and other mechanical properties) through filling modification, but also because it reduces product costs and enhances market competitiveness under the premise of ensuring quality.

The aging properties of ABS/ barium sulfate system and the effects of stearic acid, titanate coupling agent and rare earth coupling agent on the aging properties of ABS system were studied by natural exposure and hot oven aging experiment. The experimental results show that the addition of barium sulfate can block the aging process of ABS system, and can improve the aging resistance of ABS system.

The morphology, structure and mechanical properties of polyamide 66(PA66)/ barium sulfate composite were investigated. The effect of barium sulfate surface treatment on the mechanical properties of the composite was discussed. The results show that in the PA66 composite system modified by 20% activated barium sulfate and 5% ethylene-octane copolymer fused with maleic anhydride, a small part of barium sulfate has the abnormal nucleation effect on PA66, and most of barium sulfate has the toughening effect on PA66. Compared with no activated barium sulfate, the tensile strength and bending strength of the material are increased by 10MPa and 11MPa, and the notched impact strength of the simple supported beam is increased by 9kJ/m2.


sulfate,engineering plastics,general plastics,The application

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