Composition of high temperature resistant powder coating
Formulation of high temperature resistant Powder coating
The main ingredients of Powder coating are as follows: resin and its curing agent, which is the basis of coating film formation; Additives to improve the appearance or functions of the coating; Pigment to give the coating covering and color; Filler, the first is to play the effect of physical enhancement.
When the commonly used full polyester resin, epoxy resin and other materials are above 350 ℃, the carbon oxygen bond will soon break and decompose, which is manifested in the powdering and falling off of the coating.
Silicone resin is the first choice for the main resin of high temperature resistant Powder coating because it takes silicone oxygen bond as the main chain and gives silicone resin high oxidation stability due to its high bond energy. Pigments and fillers are the key to affecting the function of high temperature resistant coatings. Fillers should have high stability and can react with siloxane functional groups of silicone resin. Therefore, silicate fillers are the first choice, such as mica powder, silicon micro powder, etc.
The other is silicate materials, which mainly because their phosphate can react with the metal, and then ensure the adhesion between the coating and the substrate.
In terms of pigments, most conventional pigments can not enjoy the high temperature above 500 ℃. Titanium dioxide can be selected for white, iron oxide black, iron manganese black, red, yellow and blue can be selected for black. It is advocated to select wrapped products, and the overall formula can ensure that heavy metals will not overspend.
According to the different Powder coating materials to be destroyed, select the destruction rod and sieve plate with appropriate structure, separately install the destruction rod and sieve plate on the connecting block and spring of the transmission shaft, check whether the circuit of the Powder coating processing equipment is normal, and check whether the cylinder and motor work normally;
Pour the Powder coating material into the destruction box through the feed pipe, separate the power lines on the cylinder and motor from the external power supply, start the motor, the motor drives the transmission shaft to rotate, and then drives the connection block and the destruction rod on the connection block to destroy the Powder coating material in the destruction box, and the damaged Powder coating material falls into the silo below the destruction box, Start the cylinder, and the cylinder drives the damage box to move up and down on the guide rail through the piston rod, so that the damaged Powder coating material falls onto the sieve plate through the damage box;
The cylinder and piston rod continue to push the damage box down and contact with the sieve plate to break the unselected large particle Powder coating materials on the sieve plate, so as to improve the damage quality and damage efficiency of Powder coating materials, and then improve the product quality of coatings;
The Powder coating material selected by the sieve plate falls into the deflector, flows into the discharge bin through the deflector and is discharged from the silo;
After the Powder coating materials are damaged and selected, close the cylinder and motor, remove the residual Powder coating materials in the silo and damage box, and cut off the power supply.