Polychlorotrifluoroethylene fluorocarbon powder coating

ECT FE is an alternating copolymer of ethylene and trifluoroethylene (CTFE), exhibiting excellent properties that differ from conventional materials. It has excellent chemical resistance and electrical insulation performance within a wide temperature range from low temperature to 150 ° C, and is a tough material with excellent impact strength. Its compact internal structure makes it one of the best fluorinated polymers for wear resistance and impermeability, making it particularly suitable as a protective and anti-corrosion coating material.

● Thermal performance, chemical performance, and impermeability

● Surface smoothness

● Mechanical properties

● Cleanliness

● Electrical performance

● Flame retardant performance

● Processing performance

Excellent adhesion

ECT FE has extraordinary corrosion resistance to the vast majority of inorganic, organic chemicals, and organic solvents. Until now, no solvent has been able to corrode ECTFE or cause cracks below 120 ℃. Compared with other thermoplastic materials, the resistance of ECTFE to chlorine and its derivatives at high temperatures is particularly outstanding. ECT FE has excellent corrosion resistance, extremely low permeability, excellent electrical performance, and extremely smooth surface, making it safe to use in the temperature range of low temperature to 150 ℃. It not only has outstanding impact resistance, but also is a tough material with considerable mechanical strength. It is suitable for manufacturing products for safe use and complies with the German BGA Deuschland standard when in constant contact with food ingredients. It avoids the influence of smell and taste. Therefore, it has been recommended as a "clean" ECTFE abroad and is allowed to be used in the food and water industry.

The surface of ECT FE finished products, similar to glass, can prevent the growth of microorganisms and provide significant hygiene advantages. Solvay Solexis, an American company, provided an interesting experimental result: under 1000x magnification, the surface of the "HALAR" resin lining was compared with PP (polypropylene), PVDF (polyvinylidene fluoride), and PVC (polyvinyl chloride) plastics; The surface of the former still appears smooth, with relatively few bacteria found in areas such as pits, while the other three types of plastic surfaces show granular and uneven surfaces, with much more bacteria.

Application technology:

For devices and pipelines used in the petrochemical industry, ECTFE resin is a more suitable material for thin lining, such as pumps, valves, containers, storage tanks, and fittings. The company claims that as long as a 0.13-0.18mm thick "HALAR" brand of ECTFE thin film coating is applied, it is sufficient to resist the corrosion of media such as hydrochloric acid, fluoroboric acid, sulfuric acid, and sodium hydroxide, demonstrating the anti penetration ability of such fluoroplastics.

Application examples:

Using HALAR brand ECTFE resin, it can ensure the correct thickness of the lining required by the user. The forming process can meet the coating requirements for large tank linings, complex shaped pipe fittings, valves, and even spiral bent springs. The coating adhesion is firm and tough, and can even withstand thousands of universal cyclic bending and shapes. When used for coating propellers or fan impellers, it not only has no pinholes, a smooth and non sticky surface, but also exhibits excellent corrosion resistance. It is widely used in drainage, washing, sewage treatment systems of chemical and petroleum industries, as well as chemical cleaning systems of equipment and distribution systems of chemical drugs.

1. Chlorine washing tower

What is the size of the tower? 1.22 x 2.44m. Wash with sodium hydroxide solution to remove chlorine gas from the tail gas generated by the production process of zirconium metal. The tower has formed a harsh corrosive environment. The tower was originally lined with vinyl resin fiberglass, but due to the medium's ability to penetrate through the resin rich fiberglass layer, corrosion damage occurred, resulting in a maximum lifespan of 3 years. We now use the HALAR brand's ECTFE thin lining, which has been in use for more than 6 years. When opened for inspection during maintenance, it still looks like new.

2. Hydrofluoric acid delivery pipeline

The 25-50mm pipeline is approximately 90m long and is used to transport 70% hydrofluoric acid. It is lined with thin sheets of ECTFE and has been in use for about 2 years without any leakage or corrosion.

3. Sodium hypochlorite treatment system

The production process of corn starch involves the treatment of complex carbohydrates with sodium hypochlorite and other chemicals, ultimately resulting in a pure and white product. This treatment system involves chlorine gas, which corrodes most metals. The solution storage tank for intermediate products was once made of polypropylene, and the conveying pipeline with a diameter of 75mm was made of PVC material. The system discovered a leak in the PVC lining pipe as soon as it was driven, and later replaced it with PP lining pipe. Although PP material is corrosion-resistant, the pipeline experienced corrosion leakage at the flange of the pipe fittings during use. It was replaced by the ECT FE thin lining pipe in less than 3 years. It has been in use for more than 2 years and no corrosion leakage has been found.

4. Repainting or repairing old equipment

Given the high cost of new equipment, the use of HALAR brand ECTFE resin is suitable for the re coating or repair of old equipment, which is a promising and recommended application field. All corroded old pump impellers and casings, as well as devices that are difficult to repair or cannot be repaired within our company, can be solved using fluidized bed forming or rotary forming thin sheet lining processes. Due to the fact that the time required for fluidized bed and rotary forming processes is only a very small part of the fiberglass lining, and the labor cost of the lining only accounts for a very small proportion, despite the high cost of raw materials and other aspects, the rotary forming price of HALAR brand's ECTFE can still compete with the price of fiberglass lining in European and American countries.

For certain complex components, such as impellers, propeller blades used for mixing tanks, springs used for conveying devices, etc., using rotary formed thin film lining or coating will not only resist strong corrosion at high temperatures, but also eliminate cracks, pinholes, or rupture defects that may occur in fiberglass lining.

Processing and forming methods

1、 Electrostatic spray molding

HALAR ECTFE electrostatic spraying process

1. Surface treatment: Sandification of 16 mesh sand

2. Preheating temperature: 290 degrees

3. Preheating time: 30 minutes

4. Baking time: 15 minutes

5. Spray time: 1-2 minutes

6. Furnace temperature: 275 degrees

Application example: 100X100X3MM carbon steel plate for spraying components

1. Surface treatment: sandblasting 16 grit of sand;

2. Preheating: 285-290 degrees Celsius, time of 30 minutes, with the entire component reaching a uniform temperature as appropriate;

3. First layer of primer spraying: The entire surface of the coated object must be covered with primer (6614). After spraying, place the components in the furnace at a temperature of 270-275 degrees Celsius and bake for 7-10 minutes;

4. Second layer of topcoat spraying: Spray HALAR topcoat (6014) evenly on the components until the unpainted powder melts, then place the components back in the furnace at a temperature of 270-275 degrees Celsius and bake for 7-10 minutes.

5. Third layer of topcoat spraying: The operation is the same as above. After each spraying, the furnace temperature is set at 270 degrees Celsius and the baking time is 10-15 minutes.

After the final spraying, remove the components from the furnace and place them in the open air to cool naturally to room temperature. As a HARLAR used for chemical anti-corrosion, the usual spraying thickness is 0.8-1mm. Due to differences in the shape, size, and metal thickness of the components, the number of layers required for spraying varies, but generally, this thickness can be achieved after 5-6 rounds of spraying.

2、 Fluidized bed forming

Preheat the parts that need to be processed to around 240 ℃, then immerse the heated parts in a boiling point boiling state, that is, continuously flowing up, down, left and right, in an ECTFE resin bath. It only takes 1-2 seconds to remove them. This is the forming process of fluidized bed. In order to obtain a thicker coating, experienced operators can dissolve the components in a resin bath for 2-4 seconds; Finally, heat and melt in the oven. This process is suitable for painting small and complex components.

3、 Rotary molding

Abbreviated as rolling lining forming, the equipment and pipeline itself can be used as molds. Pre heat the parts to be coated, and then spray the resin powder onto the surface of the rotating parts. Utilize the heat of the parts to melt and adhere the resin to the surface of the parts. Due to the continuous rotation of the coated parts, the thickness of the thin lining is ensured to be uniform. This molding process is particularly suitable for the thin lining of processing equipment (when using prefabricated molds, a considerable thickness of overall plastic equipment can be obtained), as well as for the repair and reprocessing of old equipment lining.

Product form

In addition to being used as spray powder, Halar itself is a thermoplastic resin that can be formed using the same processing methods as other plastics such as PE, PP, PVC, etc.

Powder materials used for powder spraying

Granular materials used for extrusion, injection, molding, and melt blown fibers

Typical applications of grades

6014 topcoat, colorless

6614 primer, green

6514 primer, black

6014F topcoat, colorless, low melt index

6914 topcoat, gray, low melt index

9414 single system, beige, with stronger waterproof vapor permeability than 6014

3404DA single system, beige, food grade