Powder coating for radiator and preparation process of powder coating

Abstract

The invention relates to a powder coating, in particular to a powder coating for a radiator and a preparation process of the powder coating. The powder coating consists of the following components: 30-32 percent of phenolic aldehyde modified epoxy resin, 30-32 percent of hydroxyl saturated polyester resin, 0.5-1.5 percent of pigment, 20-30 percent of rutile TiO2, 8-12 percent of calcium carbonate, 0.8-1 percent of flatting agent, 0.4-0.6 percent of yellow-preventing benzoin, 0.4-0.6 percent of polysiloxane defoaming agent, 0.8-1.3 percent of cross-linking agent and 0.5-1 percent of antioxidant. The powder coating for a radiator is scientific in formula, the cured film cannot become yellow after being exposed in a high-temperature working environment of the radiator for a long time, the salt fog resistance, gloss preserving property and the impact resistant property of the film are excellent, the preparation process is simple and feasible, and the market prospects are wide.

Description

technical field

[0001] The invention relates to a powder coating, in particular to a powder coating for a radiator and a preparation process thereof. Background technique

[0002] Powder coatings are widely used in household appliances, aluminum profiles and metal furniture industries due to their advantages of environmental protection, energy saving and high efficiency, which provide good decorative and protective effects for metal surfaces. Because the radiator needs to be at high temperature for a long time during use, its surface coating film is prone to yellowing, tarnishing, and poor mechanical properties, which not only hinders the appearance, but also tends to shorten the safe service life of metal components. The common characteristics of existing radiators are: many solder joints, long weld seams, many connection parts, and many dead spots in electrostatic spraying. Ordinary decorative powder coatings will appear bubbles, shrinkage cavities, and pinholes during the...

Examples

Embodiment 1

[0014] A kind of powder coating for radiator, its preparation method has the following steps:

[0015] (1) 30% phenolic modified epoxy resin, 30% hydroxyl saturated polyester resin, 1.1% pigment, 26% rutile TiO 2 , 10% calcium carbonate, 0.8% leveling agent, 0.4% anti-yellow benzoin, 0.4% polysiloxane defoamer, 0.8% cross-linking agent and 0.5% antioxidant, put into a high-speed mixing mixer and mix fully and evenly 10-12min;

[0016] (2) Add the uniformly mixed material to the screw extruder with the temperature of 100°C and 110°C in Zone I and Zone II, and the screw rotation controlled by the frequency of the host machine at 32hz will fully melt and knead the material, and then extrude, Press the tablet, then cool and crush it through the conveyor belt, put the crushed flakes into the hopper of the mill, and control the main and auxiliary mills of the mill to grind the flakes with a 180-mesh screen. Sieve powder coatings for radiators.

[0017] The powder coating is spray...

Embodiment 2

[0020] A kind of powder coating for radiator, its preparation method has the following steps:

[0021] (1) 32% phenolic modified epoxy resin, 32% hydroxyl saturated polyester, 0.5% pigment, 22% rutile TiO 2 , 9% calcium carbonate, 1% leveling agent, 0.6% anti-yellow benzoin, 0.6% polysiloxane defoamer, 1.3% cross-linking agent and 1% antioxidant, put them into a high-speed mixing mixer and mix them fully and evenly 10-12min;

[0022] (2) Same as embodiment one step (2).

[0023] The powder coating is sprayed on the surface of the radiator by electrostatic spraying construction method, and it can be fully cured after 7 minutes at 205°C.

[0024] After testing: the D50 particle size of the powder coating is 38-42μm; the impact resistance of the cured coating film (GB / T1732-1993): 50cm forward and recoil pass; heat resistance: 150°C, 35h baking without loss of gloss Color change; salt spray test 500h (GB / T1771-1991): no blistering, no cracking and no peeling; adhesion (1mm cro...

Embodiment 3

[0026] A kind of powder coating for radiator, its preparation method has the following steps:

[0027] (1) 32% phenolic modified epoxy resin, 32% hydroxyl saturated polyester, 1% pigment, 25% rutile TiO 2 , 6% calcium carbonate, 0.8% leveling agent, 0.4% anti-yellow benzoin, 0.4% polysiloxane defoamer, 1% cross-linking agent and 1.4% antioxidant, put it into a high-speed mixing mixer and mix it fully and evenly 10-12min;

[0028] (2) Same as embodiment one step (2).

[0029] The powder coating is sprayed on the surface of the radiator by electrostatic spraying construction method, and it can be fully cured after 10 minutes at 200°C.

[0030] After testing: the D50 particle size of the powder coating is 38-42μm; the impact resistance of the cured coating film (GB / T1732-1993): 50cm forward and recoil pass; heat resistance: 150°C, 35h baking without loss of gloss Color change; salt spray test 500h (GB / T 1771-1991): no blistering, no cracking and no peeling; adhesion (1mm cross...

technical field

[0001] The invention relates to a powder coating, in particular to a powder coating for a radiator and a preparation process thereof. Background technique

[0002] Powder coatings are widely used in household appliances, aluminum profiles and metal furniture industries due to their advantages of environmental protection, energy saving and high efficiency, which provide good decorative and protective effects for metal surfaces. Because the radiator needs to be at high temperature for a long time during use, its surface coating film is prone to yellowing, tarnishing, and poor mechanical properties, which not only hinders the appearance, but also tends to shorten the safe service life of metal components. The common characteristics of existing radiators are: many solder joints, long weld seams, many connection parts, and many dead spots in electrostatic spraying. Ordinary decorative powder coatings will appear bubbles, shrinkage cavities, and pinholes during the...

Examples

Embodiment 1

[0014] A kind of powder coating for radiator, its preparation method has the following steps:

[0015] (1) 30% phenolic modified epoxy resin, 30% hydroxyl saturated polyester resin, 1.1% pigment, 26% rutile TiO 2 , 10% calcium carbonate, 0.8% leveling agent, 0.4% anti-yellow benzoin, 0.4% polysiloxane defoamer, 0.8% cross-linking agent and 0.5% antioxidant, put into a high-speed mixing mixer and mix fully and evenly 10-12min;

[0016] (2) Add the uniformly mixed material to the screw extruder with the temperature of 100°C and 110°C in Zone I and Zone II, and the screw rotation controlled by the frequency of the host machine at 32hz will fully melt and knead the material, and then extrude, Press the tablet, then cool and crush it through the conveyor belt, put the crushed flakes into the hopper of the mill, and control the main and auxiliary mills of the mill to grind the flakes with a 180-mesh screen. Sieve powder coatings for radiators.

[0017] The powder coating is spray...

Embodiment 2

[0020] A kind of powder coating for radiator, its preparation method has the following steps:

[0021] (1) 32% phenolic modified epoxy resin, 32% hydroxyl saturated polyester, 0.5% pigment, 22% rutile TiO 2 , 9% calcium carbonate, 1% leveling agent, 0.6% anti-yellow benzoin, 0.6% polysiloxane defoamer, 1.3% cross-linking agent and 1% antioxidant, put them into a high-speed mixing mixer and mix them fully and evenly 10-12min;

[0022] (2) Same as embodiment one step (2).

[0023] The powder coating is sprayed on the surface of the radiator by electrostatic spraying construction method, and it can be fully cured after 7 minutes at 205°C.

[0024] After testing: the D50 particle size of the powder coating is 38-42μm; the impact resistance of the cured coating film (GB / T1732-1993): 50cm forward and recoil pass; heat resistance: 150°C, 35h baking without loss of gloss Color change; salt spray test 500h (GB / T1771-1991): no blistering, no cracking and no peeling; adhesion (1mm cro...

Embodiment 3

[0026] A kind of powder coating for radiator, its preparation method has the following steps:

[0027] (1) 32% phenolic modified epoxy resin, 32% hydroxyl saturated polyester, 1% pigment, 25% rutile TiO 2 , 6% calcium carbonate, 0.8% leveling agent, 0.4% anti-yellow benzoin, 0.4% polysiloxane defoamer, 1% cross-linking agent and 1.4% antioxidant, put it into a high-speed mixing mixer and mix it fully and evenly 10-12min;

[0028] (2) Same as embodiment one step (2).

[0029] The powder coating is sprayed on the surface of the radiator by electrostatic spraying construction method, and it can be fully cured after 10 minutes at 200°C.

[0030] After testing: the D50 particle size of the powder coating is 38-42μm; the impact resistance of the cured coating film (GB / T1732-1993): 50cm forward and recoil pass; heat resistance: 150°C, 35h baking without loss of gloss Color change; salt spray test 500h (GB / T 1771-1991): no blistering, no cracking and no peeling; adhesion (1mm cross...