CN115717022A - High-temperature-resistant powder coating for battery trays of electric and hybrid vehicles - Google Patents
High-temperature-resistant powder coating for battery trays of electric and hybrid vehicles Download PDFInfo
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- CN115717022A CN115717022A CN202211551305.2A CN202211551305A CN115717022A CN 115717022 A CN115717022 A CN 115717022A CN 202211551305 A CN202211551305 A CN 202211551305A CN 115717022 A CN115717022 A CN 115717022A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a high-temperature-resistant powder coating for battery trays of electric and hybrid vehicles, which is prepared from the following raw materials in parts by mass: 60-65 parts of high-temperature-resistant saturated polyester and 5-10 parts of organic silicon resin; 4.5 to 4.9 portions of curing agent, 0.1 to 0.2 portion of isophorone diisocyanate, 0.8 to 1.2 portions of universal leveling agent, 0.2 to 0.5 portion of universal brightening and hardening agent and 0.3 to 0.5 portion of defoaming agent; 15.7-23.4 parts of insulating heat-conducting filler; 0.8 to 1.2 portions of insulating carbon black. This scheme of adoption can be solved electronic and mix and move the car power battery and generate heat in the use, causes quick ageing for filming, lets battery tray lose the problem of filming guard action fast.
Description
Technical Field
The invention relates to the technical field of powder coatings, in particular to a high-temperature-resistant powder coating for battery trays of electric and hybrid vehicles.
Background
In recent years, with the rising price of petroleum energy, new energy electric and hybrid electric vehicles have attracted special attention and developed rapidly. Such electric and hybrid vehicles use batteries as a driving energy source. However, batteries generate heat during use, and a large number of batteries collected together generate a high temperature. Batteries are usually arranged on the chassis of an automobile, and the high temperature emitted by the batteries can cause the common coating film on the surface of the chassis to age quickly, so that the protection effect of the coating film on the chassis is lost.
At present, the conventional powder coating for the power battery trays of electric and hybrid vehicles on the market cannot meet the requirement of high temperature resistance, and is detected in a laboratory: the paint film can be oxidized after being kept for 7 days at the temperature of 120 ℃ and is yellow, and the color difference value delta E is more than 2; when the temperature is kept at 300 ℃ for 10 minutes, the resin can be decomposed, and the coating film foams and falls off, so that the adhesive force and the insulation and voltage resistance functions are lost correspondingly. In the actual use process, the battery can generate heat, and the battery tray can reach more than 60 ℃ due to weather factors, and the coating film can be aged quickly when being in a high-temperature state for a long time and is shown as being dull, pulverized and shed, so that the battery tray is not protected.
Therefore, a powder coating is needed to solve the problems that the power battery of the electric and hybrid electric vehicles generates heat in the using process, the coating film is quickly aged, and the battery tray quickly loses the protection effect of the coating film.
Disclosure of Invention
In view of the problems in the prior art, the present invention aims to: the high-temperature-resistant powder coating for the battery tray of the electric and hybrid electric vehicles solves the problems that the power battery of the electric and hybrid electric vehicles generates heat in the using process, the coating film is quickly aged, and the battery tray loses the coating film protection effect quickly.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a high-temperature-resistant powder coating for battery trays of electric and hybrid vehicles is prepared from the following raw materials in parts by mass:
further preferably, the performance index of the high temperature saturated polyester is as follows: the viscosity is 11000 to 16000mPa.s at 200 ℃; the acid value is 26-34 mgKOH/g; a Tg of 67; the temperature resistance is 270 ℃.
In a further preferred technical scheme, the curing agent is triglycidyl isocyanurate.
Further preferably, the defoaming agent is benzoin.
According to a further preferable technical scheme, the insulating heat-conducting filler is silica micropowder.
Further preferably, the insulation resistance of the insulating carbon black is 1014 Ω or more.
The invention has the beneficial effects that:
the powder coating is coated on the surface of a battery tray of an electric or hybrid vehicle, and has the following high-temperature resistance: the coating is kept for 7 days at the temperature of 120 ℃, and the coating does not crack, fall off, bubble or discolor (the color difference value delta E is less than 1.5); the adhesive force can still reach 0 grade; the insulation and voltage resistance performance can still meet the requirement. The coating is kept for 10 minutes at the temperature of 300 ℃, and the coating does not crack, fall off or bubble; the adhesive force can still reach 0 grade; the insulation and voltage resistance performance can still meet the requirement.
Therefore, the powder coating solves the problems that the power battery of the electric and hybrid electric vehicles generates heat in the using process, the coating film is quickly aged, and the battery tray quickly loses the coating film protection effect.
Detailed Description
Example 1:
a high-temperature-resistant powder coating for battery trays of electric and hybrid vehicles comprises the following raw materials in parts by mass:
wherein, the performance index requirements of the high-temperature saturated polyester are as follows: the viscosity is 11000 to 16000mPa.s at 200 ℃; the acid value is 26-34 mgKOH/g; tg of 67; the temperature resistance is 270 ℃.
The curing agent adopts triglycidyl isocyanurate, and is a curing agent of saturated polyester.
Wherein the defoaming agent adopts benzoin.
Wherein, the insulating heat-conducting filler adopts silica powder.
Wherein the insulation resistance of the insulating carbon black is 1014 Ω or more.
The production process of the powder coating comprises the following steps:
1. premixing
(1) Firstly, adding about 1/2 of the weighed raw materials into a stirring tank, then sequentially adding all the raw materials except the high-temperature-resistant saturated polyester resin, and finally adding the rest about 1/2 of the high-temperature-resistant saturated polyester resin into the stirring tank.
(2) And (3) preparing the stirring tank, setting the stirring machine to stir for 3 minutes at a slow speed and 60 seconds at a fast speed, and starting an automatic stirring mode to stir. The rotational frequency of the slow stirring is 20Hz, and the rotational frequency of the fast stirring is 40Hz.
2. Extrusion
(1) Setting the temperature of a zone I of the double-screw extruder to be 95-100 ℃, the temperature of a zone II of the double-screw extruder to be 100-105 ℃, and the temperature of a zone III of the double-screw extruder to be 105-110 ℃ (the temperature of each zone can not be set to be too high or too low, the high temperature can be coked during extrusion, and the low temperature can not be melted), preheating the double-screw extruder to the set temperature, and stabilizing for 10 minutes.
(2) Taking about 5KG of the stirred mixed raw materials, putting the mixed raw materials into a feeding hopper of an extruder, sequentially opening switches of a crushing roller, a pressing roller, an extrusion screw (the rotating speed frequency of the screw is adjusted to 40-45 Hz) and a feeding screw (the rotating speed frequency of the feeding screw is adjusted to 20-25 Hz), and starting extrusion.
3. Detection of
(1) The detection method comprises the following steps:
preparing sample powder: during the extrusion process, about 100 g of the middle part of the tablet is selected, ground by a small mill, sieved by a 200-mesh sieve and made into sample powder.
Electrostatic spraying: the sample powder is sprayed on a standard detection board without oil, rust and other stains to a thickness of 150 +/-50 mu m.
And (3) curing: and placing the sprayed detection plate into an oven at 200 ℃ for baking for 10 minutes.
And (3) cooling: taking out and naturally cooling.
(2) And (3) detection results:
keeping the temperature at 120 ℃ for 7 days, and enabling the color difference value delta E of the coating film to be =1.2, so that the requirement is met; the coating is kept for 10 minutes at 300 ℃, the coating does not bubble or fall off, the adhesive force =0 level, the direct current voltage of an insulation and voltage resistance test is 3.8kv, the leakage current is less than 10mA, the alternating current voltage is 1.5kv, and the leakage current is less than 10mA, so that the requirement of insulation and voltage resistance is met.
And continuously extruding according to the process of 'second extrusion' after the detection is passed, and repeating the four steps of premixing, stirring, extruding and detecting after corresponding adjustment if the item is not passed until the product is qualified.
(3) Grinding:
grinding the crushed sheet materials by an ACM (acid-activated mechanical grinding) mill, sieving by a 200-mesh rotary sieve, adjusting the rotation speed of a main grinding mill and an auxiliary grinding mill to ensure that the particle diameter D50= 32-37 um, and performing sampling inspection once every 10 boxes (200 KG).
Comparative experiment 1: with respect to example 1, the high temperature resistant saturated polyester was replaced with a general saturated polyester, the silicone resin was removed, and the resulting product was tested.
The formulation of comparative experiment 1 is as follows:
the test method is as follows:
preparing sample powder: during the extrusion process, about 100 g of the middle part of the tablet is selected, ground by a small mill, sieved by a 200-mesh sieve and made into sample powder.
Electrostatic spraying: the sample powder is sprayed on a standard detection board without oil, rust and other stains to a thickness of 150 +/-50 mu m.
And (3) curing: and placing the sprayed detection plate into an oven at 200 ℃ for baking for 10 minutes.
And (3) cooling: taking out and naturally cooling.
The test results were as follows:
keeping the temperature at 120 ℃ for 7 days, and enabling the coating film to become yellow and the color difference value delta E to be more than 2; when the coating is kept for 10 minutes at 300 ℃, the coating foams and falls off, and accordingly, the adhesive force and the insulating and pressure-resistant functions are lost.
Comparative experiment 2: the product obtained was tested after only the silicone resin had been removed, relative to example 1.
The test method is as follows:
preparing sample powder: during the extrusion process, about 100 g of the middle part of the tablet is selected, ground by a small mill, sieved by a 200-mesh sieve and made into sample powder.
Electrostatic spraying: the sample powder is sprayed on a standard detection board without oil, rust and other stains to a thickness of 150 +/-50 mu m.
And (3) curing: and placing the sprayed detection plate into an oven at 200 ℃ for baking for 10 minutes.
And (3) cooling: taking out and naturally cooling.
The test results were as follows:
keeping the temperature at 120 ℃ for 7 days, and ensuring that the color difference value delta E of the coating film is =1.2, thereby meeting the requirements; the coating film foams and falls off after being kept for 10 minutes at the temperature of 300 ℃, and accordingly, the adhesive force and the insulation and voltage resistance functions are lost, and the requirement is not met.
Example 2:
a high-temperature-resistant powder coating for battery trays of electric and hybrid vehicles comprises the following raw materials in parts by mass:
wherein, the performance index requirements of the high-temperature saturated polyester are as follows: the viscosity is 11000 to 16000mPa.s at 200 ℃; the acid value is 26-34 mgKOH/g; tg of 67; the temperature resistance is 270 ℃.
Wherein the curing agent adopts triglycidyl isocyanurate. The curing agent is a curing agent for saturated polyesters.
Wherein the defoaming agent adopts benzoin.
Wherein, the insulating heat-conducting filler adopts silica micropowder.
Wherein the insulation resistance of the insulating carbon black is 1014 Ω or more.
The production process of the powder coating comprises the following steps:
1. premixing
(3) Firstly, adding about 1/2 of the weighed raw materials into a stirring tank, then sequentially adding all the raw materials except the high-temperature-resistant saturated polyester resin, and finally adding the rest about 1/2 of the high-temperature-resistant saturated polyester resin into the stirring tank.
(4) And (3) preparing the stirring tank, setting the stirring machine to stir for 3 minutes at a slow speed and 60 seconds at a fast speed, and starting an automatic stirring mode to stir. The rotational frequency of the slow stirring is 20Hz, and the rotational frequency of the fast stirring is 40Hz.
3. Extrusion
(1) Setting the temperature of a zone I of the double-screw extruder to be 95-100 ℃, the temperature of a zone II of the double-screw extruder to be 100-105 ℃, and the temperature of a zone III of the double-screw extruder to be 105-110 ℃ (the temperature of each zone can not be set to be too high or too low, the high temperature can be coked during extrusion, and the low temperature can not be melted), preheating the double-screw extruder to the set temperature, and stabilizing for 10 minutes.
(2) Taking about 5KG of the stirred mixed raw materials, putting the mixed raw materials into a feeding hopper of an extruder, sequentially opening switches of a crushing roller, a pressing roller, an extrusion screw (the rotating speed frequency of the screw is adjusted to 40-45 Hz) and a feeding screw (the rotating speed frequency of the feeding screw is adjusted to 20-25 Hz), and starting extrusion.
3. Detection of
(1) The detection method comprises the following steps:
preparing sample powder: during the extrusion process, about 100 g of the middle part of the tablet is selected, ground by a small mill, sieved by a 200-mesh sieve and made into sample powder.
Electrostatic spraying: and spraying the sample powder on a standard detection plate without oil, rust and other stains to a spraying thickness of 150 +/-50 mu m.
And (3) curing: and placing the sprayed detection plate into an oven at 200 ℃ for baking for 10 minutes.
And (3) cooling: taking out and naturally cooling.
(2) And (3) detection results:
keeping the temperature at 120 ℃ for 7 days, and enabling the color difference value delta E of the coating film to be =1.2, so that the requirement is met; the coating is kept for 10 minutes at 300 ℃, the coating does not bubble or fall off, the adhesive force =0 level, the direct current voltage of an insulation and voltage resistance test is 3.8kv, the leakage current is less than 10mA, the alternating current voltage is 1.5kv, and the leakage current is less than 10mA, so that the requirement of insulation and voltage resistance is met.
And continuously extruding according to the process of 'second extrusion' after the detection is passed, and repeating the four steps of premixing, stirring, extruding and detecting after corresponding adjustment if the item is not passed until the product is qualified.
(3) Grinding:
grinding the crushed sheet materials by an ACM (acid-milling and mechanical grinding) mill, sieving the ground sheet materials by a 200-mesh rotary sieve, adjusting the rotation speed of a main grinding and an auxiliary grinding to ensure that the particle diameter D50= 32-37 um, and performing sampling inspection once per 10 boxes (200 KG).
Comparative experiment 1: with respect to example 2, the high temperature resistant saturated polyester was replaced with a normal saturated polyester, the silicone resin was removed, and the resulting product was tested.
The formulation of comparative experiment 1 is as follows:
the test method is as follows:
preparing sample powder: during the extrusion process, about 100 g of the middle part of the tablet is selected, ground by a small mill, sieved by a 200-mesh sieve and made into sample powder.
Electrostatic spraying: the sample powder is sprayed on a standard detection board without oil, rust and other stains to a thickness of 150 +/-50 mu m.
And (3) curing: and placing the sprayed detection plate into an oven at 200 ℃ for baking for 10 minutes.
And (3) cooling: taking out and naturally cooling.
The test results were as follows:
keeping the temperature at 120 ℃ for 7 days, and enabling the coating film to become yellow and the color difference value delta E to be more than 2; when the coating is kept for 10 minutes at 300 ℃, the coating foams and falls off, and accordingly, the adhesive force and the insulating and pressure-resistant functions are lost.
Comparative experiment 2: the product obtained was tested after only the silicone resin had been removed, relative to example 2.
The test method is as follows:
preparing sample powder: during the extrusion process, about 100 g of the middle part of the sheet stock is selected, ground by a small grinding machine, sieved by a 200-mesh sieve and made into sample powder.
Electrostatic spraying: and spraying the sample powder on a standard detection plate without oil, rust and other stains to a spraying thickness of 150 +/-50 mu m.
And (3) curing: and placing the sprayed detection plate into an oven at 200 ℃ for baking for 10 minutes.
And (3) cooling: taking out and naturally cooling.
The test results were as follows:
keeping the temperature at 120 ℃ for 7 days, and enabling the color difference value delta E of the coating film to be =1.2, so that the requirement is met; the coating film foams and falls off after being kept for 10 minutes at the temperature of 300 ℃, and accordingly, the adhesive force and the insulation and voltage resistance functions are lost, and the requirement is not met.
Example 3:
a high-temperature-resistant powder coating for battery trays of electric and hybrid vehicles comprises the following raw materials in parts by mass:
wherein, the performance index requirements of the high-temperature saturated polyester are as follows: the viscosity is 11000 to 16000mPa.s at 200 ℃; the acid value is 26-34 mgKOH/g; a Tg of 67; the temperature resistance is 270 ℃.
Wherein the curing agent adopts triglycidyl isocyanurate. The curing agent is a curing agent for saturated polyesters.
Wherein the defoaming agent adopts benzoin.
Wherein, the insulating heat-conducting filler adopts silica powder.
The insulation resistance of the insulating carbon black is 1014 Ω or more.
The production process of the powder coating comprises the following steps:
1. premixing
(5) Firstly, adding about 1/2 of the weighed raw materials into a stirring tank, then sequentially adding all the raw materials except the high-temperature-resistant saturated polyester resin, and finally adding the rest about 1/2 of the high-temperature-resistant saturated polyester resin into the stirring tank.
(6) And (3) preparing the stirring tank, setting the stirring machine to stir for 3 minutes at a slow speed and 60 seconds at a fast speed, and starting an automatic stirring mode to stir. The rotational frequency of the slow stirring is 20Hz, and the rotational frequency of the fast stirring is 40Hz.
4. Extrusion
(1) Setting the temperature of a zone I of the double-screw extruder to be 95-100 ℃, the temperature of a zone II of the double-screw extruder to be 100-105 ℃, and the temperature of a zone III of the double-screw extruder to be 105-110 ℃ (the temperature of each zone can not be set to be too high or too low, the high temperature can be coked during extrusion, and the low temperature can not be melted), preheating the double-screw extruder to the set temperature, and stabilizing for 10 minutes.
(2) Taking about 5KG of the stirred mixed raw materials, putting the mixed raw materials into a feeding hopper of an extruder, sequentially opening switches of a crushing roller, a pressing roller, an extrusion screw (the rotating speed frequency of the screw is adjusted to 40-45 Hz) and a feeding screw (the rotating speed frequency of the feeding screw is adjusted to 20-25 Hz), and starting extrusion.
3. Detection of
(1) The detection method comprises the following steps:
preparing sample powder: during the extrusion process, about 100 g of the middle part of the tablet is selected, ground by a small mill, sieved by a 200-mesh sieve and made into sample powder.
Electrostatic spraying: the sample powder is sprayed on a standard detection board without oil, rust and other stains to a thickness of 150 +/-50 mu m.
And (3) curing: and placing the sprayed detection plate into an oven at 200 ℃ for baking for 10 minutes.
And (3) cooling: taking out and naturally cooling.
(2) And (3) detection results:
keeping the temperature at 120 ℃ for 7 days, and enabling the color difference value delta E of the coating film to be =1.2, so that the requirement is met; the coating is kept for 10 minutes at 300 ℃, the coating does not bubble or fall off, the adhesive force =0 level, the direct current voltage of an insulation and voltage resistance test is 3.8kv, the leakage current is less than 10mA, the alternating current voltage is 1.5kv, and the leakage current is less than 10mA, so that the requirement of insulation and voltage resistance is met.
And continuously extruding according to the process of 'second extrusion' after the detection is passed, and repeating the four steps of premixing, stirring, extruding and detecting after corresponding adjustment if the item is not passed until the product is qualified.
(3) Grinding:
grinding the crushed sheet materials by an ACM (acid-milling and mechanical grinding) mill, sieving the ground sheet materials by a 200-mesh rotary sieve, adjusting the rotation speed of a main grinding and an auxiliary grinding to ensure that the particle diameter D50= 32-37 um, and performing sampling inspection once per 10 boxes (200 KG).
Comparative experiment 1: with respect to example 3, the high temperature resistant saturated polyester was replaced with a normal saturated polyester, the silicone resin was removed, and the resulting product was tested.
The formulation of comparative experiment 1 is as follows:
the test method is as follows:
preparing sample powder: during the extrusion process, about 100 g of the middle part of the tablet is selected, ground by a small mill, sieved by a 200-mesh sieve and made into sample powder.
Electrostatic spraying: and spraying the sample powder on a standard detection plate without oil, rust and other stains to a spraying thickness of 150 +/-50 mu m.
And (3) curing: and placing the sprayed detection plate into an oven at 200 ℃ for baking for 10 minutes.
And (3) cooling: taking out and naturally cooling.
The test results were as follows:
keeping the temperature at 120 ℃ for 7 days, and enabling the coating film to become yellow and the color difference value delta E to be greater than 2; when the coating is kept for 10 minutes at 300 ℃, the coating foams and falls off, and accordingly, the adhesive force and the insulating and pressure-resistant functions are lost.
Comparative experiment 2: the product obtained was tested after only the silicone resin had been removed, relative to example 3.
The test method is as follows:
preparing sample powder: during the extrusion process, about 100 g of the middle part of the tablet is selected, ground by a small mill, sieved by a 200-mesh sieve and made into sample powder.
Electrostatic spraying: and spraying the sample powder on a standard detection plate without oil, rust and other stains to a spraying thickness of 150 +/-50 mu m.
And (3) curing: and putting the sprayed detection plate into an oven at 200 ℃ for baking for 10 minutes.
And (3) cooling: taking out and naturally cooling.
The test results were as follows:
keeping the temperature at 120 ℃ for 7 days, and enabling the color difference value delta E of the coating film to be =1.2, so that the requirement is met; the coating film foams and falls off after being kept for 10 minutes at the temperature of 300 ℃, and accordingly, the adhesive force and the insulation and voltage resistance functions are lost, and the requirement is not met.
The basic principles and the main features of the solution and the advantages of the solution have been shown and described above. It will be understood by those skilled in the art that the present solution is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principles of the solution, but that various changes and modifications may be made to the solution without departing from the spirit and scope of the solution, and these changes and modifications are intended to be within the scope of the claimed solution. The scope of the present solution is defined by the appended claims and equivalents thereof.
Claims (6)
1. The high-temperature-resistant powder coating for the battery tray of the electric and hybrid electric vehicles is characterized by being prepared from the following raw materials in parts by mass:
2. the high-temperature-resistant powder coating for the battery tray of the electric and hybrid electric vehicle as claimed in claim 1, wherein the curing agent is triglycidyl isocyanurate.
3. The high-temperature-resistant powder coating for battery trays of electric and hybrid vehicles according to claim 1, wherein the defoaming agent is benzoin.
4. The high-temperature-resistant powder coating for the battery tray of the electric and hybrid electric vehicle as claimed in claim 1, wherein the insulating and heat-conducting filler is silica micropowder.
5. The high-temperature-resistant powder coating for battery trays of electric and hybrid cars according to claim 1, wherein the insulation resistance of the insulating carbon black is 1014 Ω or more.
6. The high-temperature-resistant powder coating for the battery tray of the electric and hybrid automobile according to claim 1, wherein the performance indexes of the high-temperature-resistant saturated polyester are as follows: the viscosity is 11000 to 16000mPa.s at 200 ℃; the acid value is 26-34 mgKOH/g; tg of 67; the temperature resistance is 270 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211551305.2A CN115717022A (en) | 2022-12-05 | 2022-12-05 | High-temperature-resistant powder coating for battery trays of electric and hybrid vehicles |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211551305.2A CN115717022A (en) | 2022-12-05 | 2022-12-05 | High-temperature-resistant powder coating for battery trays of electric and hybrid vehicles |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117363174A (en) * | 2023-10-10 | 2024-01-09 | 湖北睿智新材料有限责任公司 | Powder coating for battery guard board and preparation method and application thereof |
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2022
- 2022-12-05 CN CN202211551305.2A patent/CN115717022A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117363174A (en) * | 2023-10-10 | 2024-01-09 | 湖北睿智新材料有限责任公司 | Powder coating for battery guard board and preparation method and application thereof |
| CN117363174B (en) * | 2023-10-10 | 2024-04-12 | 湖北睿智新材料有限责任公司 | Powder coating for battery guard board and preparation method and application thereof |
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