1. Production process flow of antibacterial masterbatch
When manufacturing antibacterial plastic products, using antibacterial masterbatch is more effective than directly using antibacterial agent powder. Antibacterial masterbatch is It is made of plastic substrate and antibacterial agent extruded and pelletized by a screw machine according to a certain formula ratio. The specific process flow is:
1. Material selection
First select the antibacterial agent according to the type of plastic. Different plastics are suitable for the use of different antibacterial agents. Generally, when developing PE antibacterial masterbatch, you can choose organic antibacterial agents with lower temperature resistance or inorganic antibacterial agents with good temperature resistance. However, PC For the development of antibacterial masterbatch, only inorganic antibacterial agents that can withstand high temperatures, such as silver ion antibacterial agents, can be selected.
Secondly, select the plastic grade used for antibacterial masterbatch according to the molding process. If you want to develop PE antibacterial masterbatch for blown film, the plastic selected must be blown film grade LLDPE. If you develop PE antibacterial masterbatch for injection molding, you can choose injection molding grade HDPE.
Finally, select the appropriate dispersant and coupling agent according to the type of antibacterial agent and plastic. Because antibacterial agents are either inorganic or organic, different types of antibacterial agents have different compatibility with plastics. In particular, inorganic antibacterial agents have poor compatibility with resin. In order to improve the compatibility between them, appropriate ones must be selected. coupling agent. In addition, in order to mix the antibacterial agent powder and plastic particles evenly and produce antibacterial masterbatch with good uniformity, it is necessary to select a good dispersant in order to make the antibacterial agent powder evenly dispersed on the surface of the plastic particles.
2. Mixing of ingredients
The selected materials are mixed in a certain proportion, and then the prepared raw materials are mixed together.
3. Granulation
After mixing evenly, put it into a screw machine, and undergo melt extrusion, granulation, and drying to obtain the antibacterial masterbatch. granular products.
2. What factors should be paid attention to when preparing antibacterial masterbatch?
In the process of preparing antibacterial masterbatch, there are two main factors that need to be paid attention to:
1. Selection of equipment
Antibacterial masterbatch is mainly granulated by a screw machine, but the screw machine can be divided into single screw and twin screw. The twin-screw has good mixing and plasticizing ability. The material stays in the extruder for a short time and has little impact on the antibacterial agent. Moreover, through the twin-screw mixing, the antibacterial agent is dispersed more evenly, and the antibacterial mother powder after extrusion and pelletization is The antibacterial agent in the granules is evenly dispersed.
2. Determination of antibacterial agent content
With different types of antibacterial masterbatches and antibacterial masterbatches for different uses, the design of the antibacterial agent content must also be adjusted when producing antibacterial masterbatch. Generally, the antibacterial agent content in antibacterial masterbatch is between 10% and 20%. However, for some antibacterial masterbatch used to make transparent plastics, the antibacterial agent content cannot be too high, otherwise it will affect the transparency of the final product. It is generally used to produce transparent plastics. The antibacterial agent content in the antibacterial masterbatch is about 6% to 10%.
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