The production of Fireproof masterbatch is a process involving multiple complex processes. The following is a general production process:
The first is the raw material preparation stage. The main raw materials include flame retardants, carrier resins and various additives. Flame retardants are key components for achieving fireproof functions. Common ones include halogen flame retardants (such as bromine flame retardants), phosphorus flame retardants, nitrogen flame retardants and inorganic flame retardants (such as magnesium hydroxide, aluminum hydroxide). Carrier resins are usually selected with good compatibility with the added materials, such as polyethylene (PE), polypropylene (PP), etc. Its function is to evenly disperse and carry components such as flame retardants. Additives include dispersants, lubricants, etc., which are used to improve processing performance and product quality.
After the raw materials are prepared, the mixing stage begins. Flame retardants, carrier resins and additives are added to a high-speed mixer in a certain proportion. The high-speed mixer uses high-speed rotating stirring blades to fully mix various raw materials under strong shear and friction forces. The key to this process is to ensure that the ingredients are evenly distributed and avoid agglomeration, because uneven mixing will affect the performance of the Fireproof masterbatch and lead to unstable fireproofing effects.
The evenly mixed materials then enter the extrusion and granulation stage. This is done using a twin-screw extruder. The material is conveyed into the barrel of the twin-screw extruder and is conveyed forward along the screw under the rotation of the screw. During this process, the material is heated and sheared, causing the resin to melt and further mix evenly with the flame retardant and other ingredients. The temperature setting of the twin-screw extruder is determined according to the melting point and processing properties of the carrier resin, and different resins require different temperature ranges. For example, for PP carrier resin, the temperature is usually set between 180-220℃. After being fully mixed and plasticized by the extruder, the material is extruded through the die head to form a strip shape, and then after being cooled in a cooling water tank, it is cut into uniform pellets by a pelletizer, which is the finished Fireproof masterbatch.
Finally, the produced Fireproof masterbatch needs to be quality tested. The test contents include whether the particle size is uniform, whether the content of flame retardant meets the standard, whether the fireproof performance meets the standard, etc. Only products that pass the strict test can enter the market and be used in the processing of various materials that require fireproof performance.