Teflon coatings is baking temperature and baking time.

these two factors are closely related to the user's oven,

1. Main raw materials

Teflon paint primer, Teflon paint finish

2. Main equipment and instruments

sandblasting machine, gas tank, high temperature oven, rolling mixer, spray gun and so on.

3. Mold Teflon spraying process.

(1) Initial inspection.

The workpiece to be treated shall be preliminarily inspected to check whether the workpiece cavity has defects such as damage, cracking and pitting. If any, it needs to be repaired before proceeding to the next step.

(2) high temperature degreasing.

the new workpiece may have grease, and the surface of the old workpiece has Teflon coating. The grease or the old coating must be cleaned before the new coating can be sprayed.

process conditions are360 ℃ × 30 minutesor380 ℃ × 10 minutes, carbonize the grease or age the old Teflon coating. The coating after aging is easy to sand blast.

(3) sand blasting roughening,

that is, the workpiece cavity surface for sand blasting roughening treatment. The selected quartz sand grain size should be moderate, and the material of the substrate should be considered (for example, the substrate is iron or aluminum?). If the sand grain size is too large or the substrate is relatively soft, it is easy to cause damage to the surface of the mold cavity, and even cause the workpiece to be scrapped. If the sand grain size is too small or the substrate is hard, the purpose of roughening cannot be achieved.availablewhite.corundum sand60Purpose~ 120Purpose, pressure0.4~0.6mpa, sandblasting,After sandblastingroughness is:2.0 ~ 5μm

(4) Primer spraying.

Before using the bottom oil, it must be fully rolled evenly or slowly stirred evenly with a stirring blade (high-speed stirring with a shearing blade is not allowed, otherwise it willwillmake the coating gel deterioration), will be processedworkpieceflat, use (1.0~1.5)mm Ф spray gun pressure to (0.2~0.3)mpa distance (20~30)cm, direct dope spraying.

Baking Conditions:(120-180)℃ × (10~30) minutes, after the watch is dryPrimerfilm thickness is(10 ~20)μm

(5) Topcoat Spraying

the same facepaintBefore use, it must be fully rolled evenly or slowly stirred evenly with stirring blades, and the workpiece coated with base oil must be applied with surface oil..

(here is a key point, some paint suppliers require the primer to be cooled to room temperature after baking10-40 ℃ can be used for topcoat spraying. Some require the primer to be cooled to about 60 ℃ before topcoat spraying. Some require the primer to come out of the oven. Under hot conditions, it is about 150-180 ℃ for spraying. The key points of this process are somewhat different. Please consult the paint supplier)

used(1.0~1.5)mm Ф spray gun nozzle, the pressure is adjusted to (0.2~0.3)mpa, the distance is (20~30)cm, direct dope spraying,

Curing Conditions:used(120-180) ℃ ×(5-20) minutes to dry first and then use 380 ℃× 10-50minutes for sintering, the total coating film after sintering is (20 ~35) m.

(6) Cooling. After the high temperature curing is completed, the temperature of the workpiece is reduced to room temperature. The cooling rate has a certain influence on the service life of the Teflon coating, because the cooling shrinkage rate of the coating and the mold substrate is different, so the effect of slow cooling of the mold in the oven is better. In addition, if the rapid cooling or cooling temperature is uneven, the workpiece is easy to deform.

(7) Post-processing. After the coating is sprayed, the workpiece needs to be post-treated.

(8) Final inspection. The final inspection of the workpiece shall be carried out according to the acceptance criteria.

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