The application of talc is widely used in many fields. It is added to the plastic in the form of a filler, which has a remarkable effect on improving the properties of the plastic. It has been reported that the crystalline structure of talc is layered, has a tendency to split into scales and has a special lubricity. The refractive index is close to that of polyolefin, and it shows good processing fluidity, transparency and high gloss in plastics. The property can impart brightness, rigidity, heat distortion temperature and creep resistance to the surface of the plastic product, and at the same time improve and shorten the product production cycle, save resin dosage and reduce production cost.
The conventional talc modification method is mainly for surface organic treatment of talc. The compatibility of the particles with the polymer is improved by changing the surface of the talc particles from hydrophilic to hydrophobic by a surfactant or a coupling agent. The main mechanism of this conventional method is to deal with the disadvantage that the talc powder has low affinity with the polymer, and the surfactant with the amphiphilic group covers the particles, the hydrophilic group faces the particle surface, and the lipophilic group faces outward. Good compatibility with the polymer for modification purposes.
Conventional processing methods are simple and easy to implement, and are also convenient for industrial applications. However, there are some disadvantages, because the layered structure of the talc powder particles is easily peeled off under the action of external force, and the fresh surface appears continuously, which brings difficulty to the surface organic treatment, especially in the plastic processing, due to the heating and shearing, Under heating conditions above 200 °C, the active agent and coupling agent on the surface of the talc powder are extremely volatile and fall off, resulting in failure of the resin falling off the surface of the talc powder.
In order to solve the drawbacks of the conventional modification method, an innovative solution is: through the layering and surface of the fine talcum powder by steam explosion stripping, hydrochloric acid etching, in the talc layer, between the layers, the layer is firmly wrapped A layer of thermoplastic resin is applied and further ground with a powdery resin, and the polymer is firmly coated on the surface of the talc particles by reflow shearing by a reciprocating screw machine. When used for plastic processing, since the coating layer does not fall off, its processing characteristics are expressed as a coated thermoplastic resin, which has good thermoplastic processing characteristics, and the thermoplastic talc powder can be mixed with the resin at a high addition amount without lowering the resin. The mechanical properties and processing properties of the talc replacement resin are promoted.
There are many methods for modifying talc powder, and the modification methods are different. However, the same goal is to improve the practicality of talcum powder, and to make the talc better serve the society through method innovation.
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