Epoxy polyester type powder coating for evaporator and preparation method thereof

Abstract

The invention relates to the technical field of a powder coating for a refrigerator evaporator, in particular to an epoxy polyester type powder coating for an evaporator and a preparation method thereof. The powder coating comprises the following components in percentage by weight: 28%-30% of saturated carboxyl polyester resin, 28%-30% of epoxy resin, 0.1%-1% of curing accelerator, 0.1%-0.4% of benzoin, 0.7%-1.4% of imported flatting agent, 0.2%-2.0% of homemade toughening agent, 15%-20% of pigment and 15%-20% of precipitated barium sulfate. Because the curing accelerator and the homemade toughening agent are added into the epoxy polyester type powder coating, the reaction is complete in the film curing process, the impact resistance of the film is improved, and the film has excellent frozen bending performance and passes the 180-degree bending performance.

Description

technical field

[0001] The invention relates to the technical field of powder coatings for refrigerator evaporators, in particular to an epoxy polyester powder coating for evaporators and a preparation method thereof. Background technique

[0002] Powder coating is widely used in the surface coating of various metal parts due to its environmental protection and economic superiority. In recent years, with the environmental protection characteristics of powder coatings, the application fields have been expanded, especially the demand for powder used in household appliances has grown rapidly.

[0003] Compared with general powder coatings, special powder coatings for refrigerator evaporators have higher requirements on the performance of the coating film and require environmental protection. Because the epoxy-polyester type powder coating is adopted in the present invention, environmental protection requirements are met; curing accelerator and self-made toughening agent are ad...

Examples

preparation example Construction

[0021] A kind of preparation method of the epoxy polyester type powder coating that is used for evaporator, this method comprises the steps:

[0022] a. Add 28% to 30% of saturated carboxyl polyester resin; 28% to 30% of epoxy resin; 0.1% to 1% of curing accelerator; 0.1% to 0.4% of benzoin; 0.7% to 1.4% of imported leveling agent; 0.2%~2.0% toughening agent; 15%~20% colorant; 15%~20% precipitated barium sulfate is put into the container according to the proportion and mixed evenly;

[0023] b. After the mixed material in step a is extruded-tablet-crushed, the finished product is obtained.

[0024] The invention adds special curing accelerator and self-made toughening agent; curing condition: 180-200°C / 10min-15min.

[0025] The powder coating of the present invention is sprayed on an evaporator for a refrigerator, and baked and solidified under the conditions of a temperature of 180-200° C. and a time of 10 minutes to 15 minutes.

Embodiment 1

[0028] Prepare raw materials, saturated carboxyl polyester resin: 30; epoxy resin: 30; curing accelerator: 0.4; benzoin: 0.4; imported leveling agent: 1; self-made toughening agent: 2; 18.2.

[0029] The above-mentioned raw materials are mixed according to the proportion, extruded, pressed into tablets, crushed, sprayed on the evaporator of the refrigerator, and baked and solidified under the conditions of temperature 180-200°C and time 10-15 minutes.

Embodiment 2

[0031] Prepare raw materials, saturated carboxyl polyester resin: 29; epoxy resin: 29; curing accelerator: 0.6; benzoin: 0.4; imported leveling agent: 1; self-made toughening agent: 1.8; twenty two.

[0032] The above-mentioned raw materials are mixed according to the proportion, extruded, pressed into tablets, crushed, sprayed on the evaporator of the refrigerator, and baked and solidified under the conditions of temperature 180-200°C and time 10-15 minutes.

technical field

[0001] The invention relates to the technical field of powder coatings for refrigerator evaporators, in particular to an epoxy polyester powder coating for evaporators and a preparation method thereof. Background technique

[0002] Powder coating is widely used in the surface coating of various metal parts due to its environmental protection and economic superiority. In recent years, with the environmental protection characteristics of powder coatings, the application fields have been expanded, especially the demand for powder used in household appliances has grown rapidly.

[0003] Compared with general powder coatings, special powder coatings for refrigerator evaporators have higher requirements on the performance of the coating film and require environmental protection. Because the epoxy-polyester type powder coating is adopted in the present invention, environmental protection requirements are met; curing accelerator and self-made toughening agent are ad...

Examples

preparation example Construction

[0021] A kind of preparation method of the epoxy polyester type powder coating that is used for evaporator, this method comprises the steps:

[0022] a. Add 28% to 30% of saturated carboxyl polyester resin; 28% to 30% of epoxy resin; 0.1% to 1% of curing accelerator; 0.1% to 0.4% of benzoin; 0.7% to 1.4% of imported leveling agent; 0.2%~2.0% toughening agent; 15%~20% colorant; 15%~20% precipitated barium sulfate is put into the container according to the proportion and mixed evenly;

[0023] b. After the mixed material in step a is extruded-tablet-crushed, the finished product is obtained.

[0024] The invention adds special curing accelerator and self-made toughening agent; curing condition: 180-200°C / 10min-15min.

[0025] The powder coating of the present invention is sprayed on an evaporator for a refrigerator, and baked and solidified under the conditions of a temperature of 180-200° C. and a time of 10 minutes to 15 minutes.

Embodiment 1

[0028] Prepare raw materials, saturated carboxyl polyester resin: 30; epoxy resin: 30; curing accelerator: 0.4; benzoin: 0.4; imported leveling agent: 1; self-made toughening agent: 2; 18.2.

[0029] The above-mentioned raw materials are mixed according to the proportion, extruded, pressed into tablets, crushed, sprayed on the evaporator of the refrigerator, and baked and solidified under the conditions of temperature 180-200°C and time 10-15 minutes.

Embodiment 2

[0031] Prepare raw materials, saturated carboxyl polyester resin: 29; epoxy resin: 29; curing accelerator: 0.6; benzoin: 0.4; imported leveling agent: 1; self-made toughening agent: 1.8; twenty two.

[0032] The above-mentioned raw materials are mixed according to the proportion, extruded, pressed into tablets, crushed, sprayed on the evaporator of the refrigerator, and baked and solidified under the conditions of temperature 180-200°C and time 10-15 minutes.