Yuan Lei's Little Knowledge | Influence of Talcum Powder in Plastic Modification
Talcum powder is second only to calcium carbonate used in plastic filler, with our in-depth understanding of talcum powder, its application is becoming more and more widely.
Talcum powder can be used in cosmetics, chemicals, ceramics, medicine, food, paper, plastics and other industries. For applications in the plastics industry, the addition of talcum powder can change the various properties of plastics, so that the molding shrinkage, surface hardness, bending modulus, tensile strength, impact strength, thermal deformation temperature, molding process and product dimensional stability and other effective properties can be improved. For engineering plastics, talcum powder is not added in many occasions, such as heat resistance, rigidity, hardness, smooth surface, convenient molding, weight, etc.
As we all know, the price of talcum powder is 10% ~ 20% of that of plastic. Especially in recent years, the price of plastic raw materials has been rising continuously. The addition of talcum powder can effectively reduce the cost of materials and improve the economic benefits of enterprises. However, the addition of talcum powder can not reduce the cost at any time. In some cases, the product cost will increase due to the limitation of addition amount and the high quality requirements of products.
In different plastic materials, the application characteristics of talc powder are also different. In addition to the economic benefits of adding talcum powder to ABS and nylon, the performance is mainly heat resistance and molding shrinkage. The addition of talcum powder to polyethylene is mainly rigidity, heat resistance, molding shrinkage and cost reduction. Polypropylene added talcum powder is the most widely used, the role of the largest, such as the improvement of the overall strength, the improvement of heat resistance, the reduction of molding shrinkage, the increase of rigidity, in addition, high mesh talcum powder, in polypropylene can play the role of nucleating agent, can effectively improve the comprehensive performance of polypropylene.
The use of talcum powder three points of attention
1, talc powder must be surface activation treatment. The activation treatment of talcum powder surface is mainly to improve the compatibility between talcum powder and plastic raw materials and increase the modification effect. Different surface treatment agents should be selected for different plastics.
2. The dispersion of talcum powder in plastic raw materials. Under the condition of the same formula, the dispersion of talcum powder in plastic raw materials has a great influence on the final physical and chemical properties of modified materials. Therefore, strict control should be carried out in the production process. The main factors affecting the dispersion of talcum powder in plastic raw materials are formula, temperature, yield, process and so on. In addition, when the amount of talc added is large, it can be added step by step to achieve a good dispersion effect.
For different plastics, different specifications of talcum powder should be selected for different requirements to achieve the desired effect. This point is very particular, and bad choices may backfire. Because different plastics, different products, and different use conditions have different requirements for raw materials, different choices must be made to achieve the desired effect.
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