How to select additives for application in reinforcement modification extruders

Plastic product formulation design may seem easy on the surface, but it's usually the simple things that don't get much attention, which affect the results later. So how do you design a high-performance, easy-to-process, low-cost formulation for use with a reinforcement modification extruder?

Here is the list of contents

The basis for selecting additives

Select the corresponding additives

The basis for selecting additives

To choose the right additives, you first need to determine the performance indicators you need and then based on the performance of the additives choose accordingly. Generally speaking, additives can be used to toughen, strengthen, increase flame retardancy, anti-static, increase electrical conductivity, increase magnetic properties, increase thermal conductivity, heat resistance, and transparency, as well as make the material more resistant to abrasion, insulation, and barrier properties. The following are the additives that correspond to these properties.

Select the corresponding additives

Toughening: selection of elastomeric materials, thermoplastic elastomeric materials, and rigid toughening materials.

Reinforcement: selection of glass fibers, carbon fiber materials, whisker fibers, and organic fibers.

Enhancement of flame retardancy: bromine (ordinary bromine and environmentally friendly bromine), phosphorus, nitrogen, nitrogen/phosphorus compound intumescent flame retardants, antimony trioxide, hydrated metal hydroxides.

Antistatic: various antistatic agents.

Enhancing electrical conductivity: carbon types (carbon black, graphite, carbon fiber materials, carbon nanotubes), metal fibers and metal powders, metal oxides.

ncreasing magnetism: ferrite magnetic powder, rare earth magnetic powder mainly including samarium cobalt class (SmCo5 or Sm2Co17), neodymium iron boron class (NdFeB), samarium iron nitrogen class (SmFeN), aluminum nickel.

Enhancing thermal conductivity: metal fibers and metal powders, metal oxides, nitrides, and carbides; carbon-based materials such as carbon black, carbon fiber materials, graphite, and carbon nanotubes; semiconductor materials such as silicon and boron.

Enhancing heat resistance: glass fibers, inorganic fillers, heat resistance agents such as substituted maleimides, and beta crystal nucleating agents.

Increasing transparency: nucleating agents, for PP the sorbitol series of α-crystalline nucleating agents are actually more effective.

Making the material more resistant to wear: 3 major types of cobalt-based magnetic powders such as graphite, molybdenum disulfide, and copper powder.

Enhancing insulation: calcined kaolin.

Enhance the barrier property: mica, montmorillonite, quartzite, etc.

Take carbon black as an example, the smaller the particle size, the easier it to form a network of conductive pathways to meet the same conductive actual effect of adding carbon black to reduce the amount. But the same as colorants, particle size also has a limit value, particle size is too small to facilitate the aggregation and difficult to disperse, and the actual effect is rather poor.

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