1 Principle and Process of Dry Process The principle of dry process is that the filler acts in a dry state at a certain temperature and by means of high-speed mixing, the treatment agent acts uniformly on the surface of the filler particles to form an extremely thin surface treatment layer. Dry treatment can be used for surface treatment of physical action, and can also be used for surface treatment of chemical action, especially dry processing at the same time as processing such as pulverization or grinding, whether it is physical or chemical, it can be obtained very well. Surface treatment effect. Obviously, this surface treatment effect has a great relationship with the surface of the newly-increased high-active filler and the particle size of the filler, which has become a very attractive new development trend. 3 Surface reaction treatment There are two types of dry surface reaction treatment methods: one is to use a treatment agent capable of forming a large reaction with the surface of the filler, such as aluminate, titanate, etc., directly reacting with the surface of the filler; The treatment agent is subjected to a reaction treatment, that is, the first treatment agent is first reacted with the surface of the filler, and after being chemically bonded to the surface of the filler, the second treatment agent is further reacted with the first treatment agent bonded to the surface of the filler. 4 Surface polymerization Many fillers have reactive groups on the surface. These groups can react with some polymerizable monomers, and then these monomers are polymerized, so that a layer of polymer is coated on the surface of the filler by chemical bonding. . When such a polymer is mixed with a plastic resin, it has a large miscibility, thereby improving the interfacial adhesion between the filler and the matrix resin, and greatly improving the mechanical properties of the filled modified plastic.
The Phenolic Resinmay be considered to be the first polymeric products produced commercially from simple compounds of low molecular weight, i.e they were the first truly synthetic resin to be exploited.
Phenolic resin has low toxicity. The phenolic resin contain basically p-t-amylphenol, p-t-butylphenol, p-nonylphenol, mixed cresols, and also used cashew nutshell liquid.
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2 The surface coating treatment agent may be a liquid, a solvent, an emulsion and a low-melting solid. The general treatment steps are as follows: After mixing uniformly, the temperature is gradually raised to a certain temperature, and the mixture is discharged at a high speed for 3-5 minutes.
Filler dry surface polymerization is a relatively novel surface treatment method. There are usually two ways: First, first treat the surface of the inorganic filler with a suitable initiator such as peroxide, then add the monomer, stir at a high speed and polymerize the monomer on the surface of the filler at a certain temperature to obtain a dry surface. The polymerization-treated filler; the other is to grind the monomer and the filler in a ball mill, and the surface of the inorganic filler is polymerized by the mechanical force of the grinding and the frictional heat to obtain a surface-polymerized filler.