3 PE anticorrosive steel pipe generally consists of three layers structure

3PE coating steel pipe generally consists of three layers structure:

A layer of epoxy powder di (FBE > 100 um)

Pretreatment quality greatly influence on the performance of the coating. Because of his bad pretreatment in the process of actual coating anticorrosive effect examples of many amounted to less than expected. Especially many excellent anti-corrosion coatings, only strictly according to the requirements of their respective can form normal coating, achieve the desired corrosion protection.

Steel base material must be after cleaning, degreasing, phosphating treatment.

Anti-corrosion coating thickness must be more than the critical thickness, to play a protective role, general is 150 microns to 200 microns.

After such as primer is placed too long to apply paint, will be difficult to adhesion and affect the overall protective effect.

Epoxy powder was coated by electrostatic spraying technology. Due to epoxy powder jinsu processing by adhesion problems, epoxy powder jinsu never can be widely used. In recent years, along with three special coconut epoxy powder jinsu phosphating liquid development success, for the first time the adhesive force of epoxy powder jinsu processing to overcome the difficulties, epoxy powder jinsu began promoting this new process.

Epoxy powder is a kind of thermosetting, non-toxic paint, formation of high molecular weight after curing coating crosslinked structure, with excellent chemical resistance and high mechanical properties, especially abrasion resistance and adhesion best. The coating is 100% solid, no solvent, no pollution, utilization rate of powder can reach more than 95%, is a good anticorrosive coating of buried steel pipeline.

The second floor adhesive (AD) 170 ~ 250 um

Glue (glue, glue, cementation, adhesive) refers to the homogeneous or heterogeneous surfaces connected with adhesive technology, has the stress distribution of continuous, light weight, or seal, most of the low temperature process. Cementing is particularly suited to different material, different thickness, ultra-thin specification and connection of complex components. Adhesive close to generation, the fastest growing industries, and the high and new science and technology progress and improve People's Daily life have a significant impact. Therefore, the research, development and production of various kinds of adhesive is very important.

As solid adsorption of adhesive is to connect the main reason of theory, known as cementing theory of adsorption. Theory is that: the main source of sticky relay is molecular reaction bonding system, namely Fan Dehua gravitational force and hydrogen bond. When the adhesive and glued the distance between the molecules up to 10 to 5 & Aring; Produces mutual attraction, interface between molecules, further shortened the distance between molecules in the da steady state.

According to the calculation, due to the effect of van der Waals force, when two ideal plane distance of 10 & Aring; When the strength of gravity between them can be up to 10-1000 mpa; When the distance is 3-4 & Aring; When can reach 100-100 mpa. This value is much more than modern the strength of the adhesive can achieve the best structure. As a result, some people think that as long as when two objects in contact with good, the adhesive for bonding interface fully wetting, assume that the two values are closely contact plane, and ensure the interface layer on the damage at the same time, the function of intermolecular also can not be guaranteed all the forces between molecules.

The polarity of the adhesive is too high, sometimes can seriously interfere with the wet process and reduce the stick relay. Molecular inter-atomic forces is to provide stick relay factors, but it is not the only factor. In some special cases, other factors can also play a leading role.

Anti-corrosion steel pipe is used adhesive is the use of it between the metal and can produce strong adsorption.

The third layer of polyethylene (PE) 2.5 ~ 3.7 mm

Polyethylene (PE) plastic one, we often mention the convenience bag is polyethylene (PE). Polyethylene is one of the most simple polymer structure, also is the most widely used polymer materials. It is composed of repeat - CH2 - unit connection. Polyethylene is through ethylene (CH2 = CH2) addition polymerization reaction.

Actual operation will be mixed together, three kinds of material processed to that of the steel pipe firmly to form excellent anticorrosive coating. The processing methods of general points spiral wound and circular mould coated type two kinds.

3 PE anticorrosive steel pipe coating (three layers of polyethylene anticorrosive coating), 2 PE anticorrosive coating is to Europe and North America widely used epoxy powder anticorrosive steel pipe coating (FBE) ingenious combination of a new kind of anticorrosive coating steel pipe. Has been recognized and used all over the world already has more than ten years.

3 PE anticorrosive coating of steel pipe is the bottom is in contact with the steel tube surface by epoxy powder anticorrosive coating, the middle layer copolymer adhesive for branching structure with functional groups. Surface for high density polyethylene anticorrosive coatings.

3 PE anticorrosive coating of epoxy resin and polyethylene material high permeability, high mechanical properties, etc. So far, is the world recognized the use effect of the best, the best performance pipeline anticorrosion coating, which has been applied in many engineering.

In three layer structure, the main function of fusion bonded epoxy powder coating is: to form a continuous film, directly bonded with structural steel pipe surface, has the very good resistance to chemical corrosion and cathodic disbonding resistance; Reactive response to form chemical bonding with the middle layer adhesive, ensure that the overall coating has good caking at higher temperatures. The middle layer is usually copolymer adhesive, its main composition is polyolefin, is currently widely used vinyl copolymer adhesive. Copolymer adhesive part polar functional groups and fusion bonded epoxy powder coating epoxy groups can react to generate hydrogen bond or bonds, middle layer and the bottom to form a good bond; Rather than polyethylene vinyl section and surface polarity has the very good close cooperation with, so the middle layer and the surface also has the very good performance. Polyethylene surface is the main function of mechanical protection and anti-corrosion effect, with the traditional polyethylene anticorrosive coating layer structure has the same effect.