How to spray PP plastic, how to paint on plastic

The landlord means that he wants to spray on the PP products after molding, right? If so, we'll address it as follows. First of all, because of the physical properties of PP, it is difficult to adhere to the paint, so it can be sanded before spraying, which is useful for larger PP injection molded parts.

Secondly, the landlord can increase the surface roughness of the inner cavity of the mold, which can increase the surface roughness of the injection molded parts. Finally, if the customer's requirements are not very strict, talcum powder with larger particle size can be added to the PP material, which can increase the surface adhesion of the PP finished product and reduce the cost.

PP plastic is generally sprayed with rubber paint, ordinary paint, PU paint, UV, etc. to obtain the required coating effect, but the PP material (polypropylene) has low surface energy, low polarity, and poor adhesion performance. An effective solution to improve the adhesion between the PP substrate and the paint coating is to use Jiongsheng PP treatment agent to solve the problem of paint loss.

The undesirable phenomenon that is more likely to occur in the PP plastic painting process is that the adhesion between the paint and the substrate is not good, the phenomenon of paint peeling, or the adhesion test methods such as Baige cannot meet the adhesion demand standard, so it is also a problem that the spraying industry needs to solve.

The main reason for the difficulty of spraying PP plastic paint and the phenomenon of paint falling off is the insufficient adhesion between the paint and the substrate, which does not form an effective bonding force. The traditional solution in the industry is to improve the adhesion of the substrate surface through grinding, corona, flame and other treatment methods, but it is difficult to meet the requirements in terms of effect, efficiency and safety.

Shizukawa PP treatment agent is sprayed on the surface of the substrate by spraying, and then sprayed with paint, through the adhesion principle of intermolecular force, cross-linked with the substrate and paint to form a solid whole, so as to improve the interlayer adhesion and achieve the effect of solving the problem of PP plastic spray paint peeling.

In the PP plastic painting process, Shizukawa PP treatment agent is suitable for different paints, such as PP surface spray rubber paint, ordinary color paint, UV paint, PU paint, etc., and the operation process also meets the requirements of hand spraying and automatic line spraying, and passes the adhesion test of 100 grids.

Construction conditionsThe spraying application temperature is (25 5). The relative humidity of construction is not more than 80%. When the humidity is too high, add CHA-13 or F-1 moisture-proof agent to the paint to prevent the coating from whitish.

Introduction to the construction conditions and process of spraying plastic parts.

Process 1: Painting (paint brushes, rollers and other tools).

2. Roller coating. 3. Air spraying (spray gun plus compressed air).

4. Impregnation method (the workpiece is soaked in a paint can filled with paint and dipped in pigment).

5. Electrostatic spraying.

6. Electrophoresis spraying.

7. High-pressure airless spraying.

Surface treatment of plastic parts:

1. Usually use thinner to clean the surface of plastic parts and degrease them chemically, so as to eliminate the oil, dust and other chemicals in the production process of plastic parts and increase the adhesion of the substrate.

2. Because plastic parts are easy to generate static electricity, and static electricity will attract some dust to fall on the substrate, which is difficult to remove, so it is necessary to carry out anti-static treatment on plastic parts, and generally use high-voltage ionized air to remove static electricity on plastic parts.

Self-spraying paint. Generally, hardware and paint stores are sold, and a variety of colors are available, less than ten yuan. Before use, you need to shake hard, there is a steel ball inside, shake the role of stirring, press the nozzle to move immediately to avoid concentration in one place, the paint is a fast-drying type, it needs to be sprayed several times to be even, can not be fast, too much at a time is not easy to dry, the surface is uneven.

1. The material and type of plastic are indeed painted, and generally speaking, a certain primer is required for spraying paint on plastics.

2. Buy primer and the corresponding surface paint, generally speaking, online ** and paint stores are available, the most common is canned, spray primer first and then spray surface decorative paint after it dries, shake vigorously before painting, so that the internal paint is uniform, follow the first concentration and then the full range, spray several times, so that it can be evenly spread on the plastic surface.

The strongest way to paint on plastic:

1.The usual solution is to clean the surface of the material to be painted.

2.If the paint still falls off, it may be due to the poor adhesion between the substrate and the paint.

3.The adhesion promoter that can be used can be sprayed between the material and the paint coating to improve the adhesion, solve the problem of paint bending and bending, and meet the requirements through the 100-grid adhesion test.

4.However, the effect and production method are uncontrollable, and there is still a certain danger. If not on the material side (considering the cost and various reasons) and the paint side (the avenues for adjusting the paint were limited), a better option is to use a treatment agent to solve the paint problem by improving the interlayer adhesion of the substrate and the paint coating.

Its application is not limited to plastics, but also widely used in the surface coating of metals (such as stainless steel, zinc alloy, aluminum alloy, etc.). ).Millions of car purchase subsidies.

PVC material has high density, small adhesion of paint on its surface, easy to peel off, and is generally not suitable for paint. But you are using a 3mm diameter PVC pipe, which is very thin, and it is only a three-dimensional composition job, just for learning. I think it can be self-spraying paint, which is very affordable.

Of course, if you want to have a good effect, you can use nitro paint if possible.

Yes.

The surface of PVC board can be painted, but the surface of the board must be haired (beaten with sandpaper) to make the paint film better "adhere" to the surface of the board, and it is best to use a paint that can resist ultraviolet rays.

The material should be painted. First of all, it is necessary to polish the surface. Use 800 or 1000 sandpaper, and after sanding, spray a layer of plastic primer on it.

That way you can spray paint. The self-spray paint will dry, and it will dry quickly, but the effect is not so good, there is no luster, and it will fall off after a long time. It is recommended to go to the paint shop and buy some good paint.

Be sure to spray a layer of plastic primer on the surface first, otherwise you will use the best paint industry will fall off. Even imported paint will come off.

Resin paint, double water paint, or PVC plastic paint.

The natural color is yellowish and translucent, and it is shiny. The transparency is better than polyethylene, polypropylene, worse than polystyrene, with the amount of additives, divided into soft and hard polyvinyl chloride, soft products are flexible and tough, feel sticky, the hardness of hard products is higher than that of low-density polyethylene, and lower than polypropylene, and there will be whitening phenomenon at the inflection. Common products:

Plates, pipes, shoe soles, toys, doors and windows, wire skins, stationery, etc. It is a polymer material that uses one chlorine atom to replace one hydrogen atom in polyethylene.

PVC (Polyvinyl Chloride) Chemical and Physical Properties Rigid PVC is one of the most widely used plastic materials. PVC material is an amorphous material. PVC materials are often added with stabilizers, lubricants, auxiliary processing agents, pigments, impact inhibitors and other additives in practical use.