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Main production process of nano-barium sulfate masterbatch
- 2019-09-20-

The main production process of nano-barium sulfate masterbatch:

Production process of general polyolefin filled masterbatch

Polyolefin functional filler masterbatch processing technology and related equipment have changed with the continuous change of China's carrier resin. Firstly, heavy calcium carbonate is used as the filling material. After mixing and pre-dispersing in various equipment, it is applied to various polyolefin products.

Generally, polypropylene or polyethylene is used as the carrier resin. There is also a formulation without a carrier. After mixing and shearing in a high mixer or internal mixer, the pellets are granulated by twin or single screws. Processes such as air cooling or water ring pelletizing have improved production efficiency and reduced the cost of original materials. Co-rotating twin-screw extruder is the most commonly used processing equipment for manufacturing filled master batches. The advantages of this machine are continuous production, stable quality, high production efficiency, low energy consumption, low labor intensity and good operating environment.

Inorganic powder: The powders mainly used for production are heavy calcium carbonate, talc, light calcium carbonate, yuanming powder and general barium sulfate. The curve span of any inorganic filler, particle size and particle size dispersion is an important technical indicator. Generally, the finer the particle size and the narrower the dispersion curve, the better the filling effect. In addition, the filling effect is also related to dispersion. According to the theory of powder engineering, when the particle size of the powder material is smaller, its appearance energy is higher, and the particles with a lot of messy charges form mutual adsorption between them. Leading to dispersal is more difficult. In order to deal with such problems, powder manufacturers mostly add liquid surface coating treatment after the particle size control of powder materials is synthesized and reacted. The surface appearance of the particles is largely shielded and inlaid. The base fraction and the critical concentration have been further improved, and in the application of polyethylene materials, a better original single particle dispersion effect has been achieved, thereby further demonstrating its outstanding optical transparency and reinforcing tensile and fracture effects.

Carrier resin: The performance of the polyolefin-filled masterbatch depends primarily on the carrier resin, which generally depends on the use of the masterbatch. The carrier resin content is generally 10% to 20%. The carrier resin used in the polyolefin-filled masterbatch should have excellent compatibility with the plastic matrix resin being filled. From this point of view, the matrix resin is generally used as the carrier resin. In addition, when choosing a filled masterbatch carrier, its melting point and melt fluidity must also be considered. The melting point of the carrier resin must not be higher than the matrix resin. Nowadays, more companies use linear low density polyethylene (LLDPE) or polypropylene (PP), and polyethylene with comparable melt index and polypropylene-like resin.

Auxiliaries: The main additives used in polyolefin filler master batches are dispersants or lubricants. The function of the dispersant is to improve the processing fluidity of the masterbatch, which is beneficial to the more uniform dispersal of the masterbatch in the matrix resin. Commonly used powders are: white oil, wax, polyethylene wax, coupling agent, stearic acid and stearates.