Preparation method of synthetic resin

Synthetic resin is a synthetic polymer that has some similar properties to natural resins. They usually have a certain melting or softening temperature range, and can show a state of plastic flow under the action of external forces. Synthetic resins can be divided into two categories: additive resins and polycondensation resins, and can also be divided into thermoplastic resins and thermosetting resins according to their properties.

Synthetic resins used in the preparation of coatings must have the following characteristics:

Good solubility and dispersion, can be uniformly dispersed in the dispersion medium.

It has excellent film forming properties, can form a film, and has specific film properties, such as gloss, hardness, elasticity, weather resistance and corrosion resistance.

Preparation method of synthetic resin

It can effectively wet the pigment and ensure that the pigment is evenly dispersed in the paint.

It has good storage stability to ensure that the coating does not have problems such as delamination or deterioration during storage.

The coatings with synthetic resin as the main film forming material are usually superior to oil coatings and natural resin coatings in mechanical properties, decorative properties and protective properties.

In the preparation of synthetic resins, there are four common methods, they are bulk polymerization, suspension polymerization, emulsion polymerization and solution polymerization.

Preparation method of synthetic resin

Bulk polymerization

Bulk polymerization, also known as bulk polymerization, is a method of preparing synthetic resins by monomer polymerization under the action of an initiator or heat, light, or radiation. The advantage of this method is that the product is pure, does not require complex separation and purification steps, and the operation is relatively simple. However, the viscosity of the material during bulk polymerization will increase with the polymerization reaction, which may lead to mixing and heat transfer difficulties, but also make the reactor temperature difficult to control. This method is commonly used to produce polymethyl methacrylate, polystyrene, polyester and polyamide resins.

Suspension polymerization

Suspension polymerization, also known as bead polymerization, is a method of polymerization by dispersing monomers into droplets and suspending them in water under the action of mechanical agitation or oscillation and dispersant. After polymerization, the resin can be obtained through a simple separation, washing and drying step, and the product is relatively pure and uniform. However, compared with bulk polymerization, the product purity of suspension polymerization is slightly lower.

Preparation method of synthetic resin

Emulsion polymerization

Emulsion polymerization method uses the action of emulsifier, under mechanical stirring or oscillation, the monomer is dispersed in water to form emulsion, and then polymerization. The product is latex, which can be applied directly or can be post-treated to produce a polymer in powder or needle form. This method can obtain high molecular weight polymers at a high reaction rate and easily remove the remaining monomers. However, the process of removing emulsifiers is complicated because the emulsifiers used in the polymerization process can affect product performance. In addition, the production capacity of emulsion polymerization reactor is lower than that of bulk polymerization.

Solution polymerization

Solution polymerization is a method of polymerization by dissolving monomers in appropriate solvents. In solution polymerization, the operation and polymerization temperature are easy to control, but the solvent needs to be recovered. This method is commonly used to produce resins such as polypropylene.

To sum up, there are a variety of synthetic resin preparation methods, and each method has its own application occasions and advantages. Choosing the right preparation method depends on the type of resin required, product purity requirements, and the specific needs of the production process. Through these methods, we are able to produce a wide range of synthetic resins, widely used in coatings, plastics, adhesives and other fields, promoting the development of modern industry.

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