Views: 420 Author: Site Editor Publish Time: 2022-05-12 Origin: Site
With the development of technology, various color masterbatches are widely used on different applications, such as electrical appliances, food packing, cosmetics, daily necessities and building materials etc. And most are used for plastic products. What is the effect of the properties of color master batch on plastic products? Today we will talk about this issue.
The influence of the organic pigments color masterbatch on the mechanical properties of plastic products
We know that inorganic pigments do not interact with plastic resins and additives, and they only exist in plastic products as inert fillers, and have no effect on the physical properties of plastic products. Organic pigments such as phthalocyanine blue exist as a nucleating agent in the molding of plastic products, which causes changes in the crystalline properties of the polymer and has a greater impact on the crystalline polymer. And organic pigments have a large specific surface area and are difficult to disperse. If the pigment particles are too large, it will affect the impact strength of plastic products. The remedy is as followings.
1. Use fine-grained pigments.
2. A certain amount of glass fiber is appropriately added to the plastic raw material to improve the strength of the plastic product.
3. Use nano-level fillers.
4. Use pigments with high coloring strength to make color masterbatch products to reduce the amount of "filler" added.
The influence of small color masterbatch on molding shrinkage of plastic products is same as above. Basically good color masterbatch has no effect on the molding shrinkage of plastic products. The crystalline polymer itself has a large molding shrinkage rate, and the shrinkage rate will be greater after the use of organic pigments to make the color masterbatch particles, especially the color masterbatch of phthalocyan blue pigment with a symmetric molecular structure. But the crystalline state of needle-like and rod-like pigments will produce greater shrinkage of plastic products.
When the shrinkage rate of plastic products is not expected to be too large, you may try to avoid pigments such as phthalocyanine blue during the color matching process of plastic products. Of course, if pigments such as phthalocyanine blue must be used, the shrinkage allowance should be considered when designing the mold. And adding an appropriate amount of glass fiber or ultrafine calcium carbonate fillers to plastic products can reduce the shrinkage of the products.
Impact on the insulation performance of plastic products
In general, inorganic pigments have little impact on insulation performance. For example, general carbon black and R-type titanium dioxide have almost no impact. Metallic pigments have the greatest impact on insulation performance, and iron oxide pigments are next. Generally, organic pigments have no effect on the insulation performance of plastic products, and the lake pigments in organic pigments have a greater impact on the insulation performance. So, when using pigment color masterbatch in the high-speed cable production line, the pigment particles must be fine and the dispersion performance should be good. It is not suitable to use iron oxide series pigment powder for the color masterbatch of insulated wire and cable.