Masterbatches play a vital role in the manufacturing of plastic products. It can not only provide uniform and vivid color, but also ensure the stability of the product during the production process. This paper will introduce the production process of PPR masterbatch in detail, including raw material selection, color matching skills and production technology.
Material selection is the first step in the production of color masterbatch, which is directly related to the quality of the final product. The basic materials of color masterbatch mainly include carrier resin, pigment and various additives.
Carrier resin: The choice of carrier resin should match the material of the final product, and the commonly used carrier resins are LDPE (low density polyethylene), LLDPE (linear low density polyethylene) and so on. The fluidity of the carrier resin should be similar to the main plastic to ensure good compatibility between the color masterbatch and the plastic.
Pigments: The choice of pigments depends on the desired color and weather resistance, temperature resistance and other properties. Inorganic pigments have good stability and are suitable for applications requiring high temperature and light resistance. Organic pigments are rich in color and suitable for products with higher color requirements.
Additives: including stabilizers, antioxidants, smoothing agents, etc., these additives can improve the processing performance and performance of the product.
Color matching is the key link in the production of color masterbatch, which directly affects the appearance of the product. The color matching process includes the measurement and mixing of pigments.
Pigment metering: Accurate pigment metering is the basis for ensuring color consistency. It is usually necessary to adjust the measurement according to the coverage and dispersion of the pigment to ensure the stability of the color of each batch of products.
Uniform mixing: the pigment and the carrier resin and additives need to be fully mixed evenly to avoid color spots and color differences. Mixing tools and conditions have an important effect on the final mixing effect.
The production process is the core link to achieve high quality masterbatch, which mainly includes melt mixing, extrusion, cutting and other steps.
Melt mixing: The prepared mixture is heated to the melting temperature of PPR, so that the pigment and resin are fully fused. This step is usually performed in twin-screw extruders, as twin-screw extruders provide better cutting and mixing results.
Extrusion: The molten PPR mixture is extruded through the die head of the extruder to form a uniform color masterbatch strip. The temperature control and screw speed in extrusion process directly affect the quality of the product.
Granulation: The extruded strip material is cooled and cut into small particles by the granulation machine. The uniformity of grain size and the uniformity of grain size are important factors to ensure the dispersion and use effect of color masterbatch.
Inspection and packaging: The completed masterbatch needs to undergo strict quality inspection, including color testing, melting point testing, etc., to ensure that the performance of each batch of color masterbatch meets the requirements. It is then packed and stored as required.