An efficient heat-resistant insulating battery coating and its preparation method

Abstract

The present invention discloses an efficient heat-resistant insulating battery coating and a preparation method thereof, which includes a base layer in contact with the coating surface and a foaming layer coated outside the base layer. The coating composition of the base layer contains epoxy resin, curing aids, glass fiber, cerium aluminum garnet and flame retardant aids. The coating composition of the foaming layer contains epoxy resin, curing aids, foaming agent, polyester, cerium aluminum garnet. The ratio of the total weight of the foaming agent in the foaming layer to the total content of epoxy resin and polyester is 0.5-1:10. The present invention improves the thermal stability of the coating substrate through cerium aluminum garnet powder, and at the same time achieves the heat insulation effect through the foaming layer. Adding cerium aluminum garnet powder can not only improve the thermal stability of the substrate, but also improve the heat-resistant effect.

Description

Technical Field

[0001] The present invention relates to the field of battery coatings, and particularly to a highly efficient heat-resistant and insulating battery coating and a preparation method thereof. Background Art

[0002] A coating is a thin film or paint applied to the surface of an object, which has various functions such as protection, decoration, and improvement of functions. According to different functions and compositions, coatings can be divided into various types. For example, an anti-corrosion coating is a coating used to prevent the corrosion of metal materials, usually composed of one or more layers of paint, which can form a protective layer on the metal surface. A waterproof coating is used to protect structures such as buildings, roofs, and basements from water erosion, usually made of materials such as polymers, rubber, and asphalt. A fireproof coating is used to prevent the spread of fire, which can produce a chemical reaction during a fire to form a heat-insulating layer and slow down the spread rate of the fire. A conductive coating is a coating that can conduct electric current, made of conductive materials such as metals or carbon nanotubes.

[0003] When manufacturing coatings, various methods are used, including powder sprinkling coating method, powder dot coating method, paste dot method, etc. Each method has its specific application scenarios and advantages. For example, the powder sprinkling coating method is suitable for low-grade lining fabrics and temporarily bonded lining fabrics, while the powder dot coating method can produce a uniform, neat, and good bonding effect coating.

[0004] The quality of coatings is affected by various factors, including adhesion, flexibility, impact strength, hardness, etc. The evaluation methods of these properties are different, but they all have an important impact on the actual application effect of coatings.

[0005] In addition, coatings also play an important role in heat insulation and insulation. Some specific coatings, such as high-temperature heat-insulating and heat-preserving coatings, have good heat insulation, insulation, and anti-corrosion properties, and can effectively protect objects. However, existing coatings still have some problems in heat insulation and insulation, such as limited heat insulation effect, insufficient insulation performance, and poor durability. When used as battery coatings, they can only meet one effect and cannot meet the requirements of existing battery production, and further research and improvement are needed. Summary of the Invention

[0006] The main object of the present invention is to provide a highly efficient heat-resistant and insulating battery coating and a preparation method thereof.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] An efficient heat-resistant insulating battery coating, comprising a base layer in contact with the coating surface and a foaming layer covering the outside of the base layer. The coating composition of the base layer contains epoxy resin, a curing aid, glass fiber, cerium aluminum garnet and a flame retardant aid. The coating composition of the foaming layer contains epoxy resin, a curing aid, a foaming agent, polyester, and cerium aluminum garnet. The ratio of the total weight of the foaming agent in the foaming layer to the total content of epoxy resin and polyester is 0.5-1:10.

[0009] Cerium aluminum garnet powder is added to both the base layer and the foaming layer. Cerium aluminum garnet is a solid material with a perovskite structure. The high insulation performance of cerium aluminum garnet can effectively prevent the conduction of electric current, thereby improving the safety and reliability of electrical equipment. At the same time, the thermal conductivity of cerium aluminum garnet is only 0.06 W / mK, which is much lower than that of the vast majority of materials. Using cerium aluminum garnet as an auxiliary material for the coating can improve the insulation performance and heat insulation performance of the coating.

[0010] Furthermore, the component content of the base layer is as follows: based on the total weight of the coating, the content of epoxy resin is 50-70% by weight, the content of the curing aid is 3-8% by weight, the content of glass fiber is 5-8% by weight, the content of cerium aluminum garnet is 30-40% by weight, the content of the dispersant is 0.5-2% by weight, the content of the flame retardant aid is 0.5-3% by weight, and the content of the conventional aid is 3-6% by weight.

[0011] Glass fiber can improve the insulation performance of the base layer. At the same time, the addition of cerium aluminum garnet in the base layer will affect the strength and adhesion of the base layer, while the addition of glass fiber can well solve this problem and can also improve the hardness, wear resistance and crack resistance of the base layer.

[0012] Furthermore, the component content of the foaming layer is as follows: based on the total weight of the coating, the content of epoxy resin is 40-50% by weight, the content of the curing aid is 3-8% by weight, the content of the foaming agent is 6-9% by weight, the content of polyester is 30-35% by weight, the content of cerium aluminum garnet is 10-20% by weight, the content of the dispersant is 0.5-2% by weight, and the content of the conventional aid is 6-8% by weight.

[0013] A foaming agent is added to the foaming layer. The foaming agent expands the coating. Through the bubbles in the foaming layer, not only the heat insulation performance of the coating is increased, but also through the cooperation of cerium aluminum garnet and the foaming agent, a multi-layer heat-resistant effect is formed for this layer of coating. At the same time, the cooperation of the foaming agent and cerium aluminum garnet also improves the insulation performance of the coating.

[0014] Furthermore, the foaming agent is a physical foaming agent, and the foaming agent includes a combination of one or more aliphatic hydrocarbons containing 5-7 carbon atoms.

[0015] The advantages of the physical foaming method are no residue pollution, which means no additional pollutants are introduced during the production process, helping to maintain the purity of the product. Secondly, the use of physical foaming agents can make the product have the characteristics of lightness, thinness, softness and elasticity, thus improving the performance of the product in terms of appearance, feel, heat preservation, etc. Moreover, physical foaming agents can replace some expensive raw materials, reduce the production cost of the product, and improve the economic benefits of the enterprise. Finally, the physical foaming method can shorten the molding time to a certain extent, improve the production efficiency, and increase the production capacity.

[0016] Furthermore, the cerium aluminum garnet is cerium aluminum garnet powder formed by grinding cerium aluminum garnet raw materials, and the cerium aluminum garnet powder is uniformly dispersed in a base material formed by epoxy resin or a combination of epoxy resin and polyester through a dispersant.

[0017] Furthermore, the epoxy resin is bisphenol A type epoxy resin.

[0018] Phenol A type epoxy resin is a high molecular compound, which is condensed from bisphenol A and epichlorohydrin under alkaline conditions and refined by washing with water and removing solvents. It has excellent physical and mechanical properties, chemical resistance and electrical insulation properties. When combined with polyester, it has a higher melting point and crystallinity, as well as good mechanical properties, heat resistance and chemical resistance, better constituting a structurally stable coating.

[0019] Furthermore, the curing agent is one or a combination of a polyphenol curing agent, dicyandiamide, a hydride curing agent, an aromatic anhydride and an aliphatic anhydride.

[0020] Furthermore, the glass fiber is in powder form.

[0021] Furthermore, a method for preparing a coating includes steps

[0022] S1, preparing a base coat: First, apply a primer on the coating surface to increase the adhesiveness of the coating. Before the primer is cured, cover the coating surface with glass fiber, and then apply the coating prepared from a mixture of epoxy resin, a curing aid, cerium aluminum garnet, a dispersant, a flame retardant aid and a conventional aid by electrostatic spraying above the glass fiber and the primer, and dry and cure it.

[0023] S2, preparing a foaming layer coating: Thoroughly mix and disperse the prepared foaming layer materials including epoxy resin, a curing aid, a foaming agent, polyester, cerium aluminum garnet and a dispersant, and then prepare the mixture into a coating through a coating preparation process. Apply the prepared coating on the outside of the base layer by electrostatic spraying, and carry out high-temperature foaming and curing.

[0024] S3, complete the coating production after cooling.

[0025] Further, the glass fiber in S1 can be multiple layers. Except for one layer of primer, the remaining layers are distributed in the base coating, that is, the base coating is applied multiple times, and one layer of glass fiber is laid each time it is applied.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] Through the layered arrangement of the base layer and the foaming layer, the present invention can not only achieve high insulation performance, but also improve the heat insulation performance. Moreover, the structure of the foaming layer can not only reduce the material consumption of the thick coating, but also improve the buffering performance, heat insulation and insulation performance of the coating;

[0028] As a material with a thermal conductivity far lower than that of most materials, cerium aluminum garnet is used as a coating material and evenly distributed in the coating, further improving the heat insulation and insulation performance of the coating;

[0029] The co-application of cerium aluminum garnet and other coating components can also produce a synergistic effect. Through the interaction with other materials, the performance of the coating can be further optimized, including the adhesion, weather resistance and wear resistance of the high coating. This synergistic effect makes the application of cerium aluminum garnet in the heat-resistant insulation coating more advantageous. Specific embodiments

[0030] The following elaborates on the preferred embodiments of the present invention in detail, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making the protection scope of the present invention more clearly defined.

[0031] An efficient heat-resistant insulation battery coating includes a base layer in contact with the coating surface. The component content of the base layer is: based on the total weight of the coating, the content of epoxy resin is 50-70% by weight, the content of curing assistant is 3-8% by weight, the content of glass fiber is 5-8% by weight, the content of cerium aluminum garnet is 30-40% by weight, the content of dispersant is 0.5-2% by weight, the content of flame retardant assistant is 0.5-3% by weight, and the content of conventional assistant is 3-6% by weight.

[0032] A foaming layer coated outside the base layer. The component content of the foaming layer is: based on the total weight of the coating, the content of epoxy resin is 40-50% by weight, the content of curing assistant is 3-8% by weight, the content of foaming agent is 6-9% by weight, the content of polyester is 30-35% by weight, the content of cerium aluminum garnet is 10-20% by weight, the content of dispersant is 0.5-2% by weight, and the content of conventional assistant is 6-8% by weight.

[0033] The foaming agent is a physical foaming agent, which includes a combination of one or more aliphatic hydrocarbons containing 5-7 carbon atoms in the hydrocarbon.

[0034] The cerium aluminum garnet is cerium aluminum garnet powder formed by grinding cerium aluminum garnet raw materials, and the cerium aluminum garnet powder is uniformly dispersed in a base material formed by epoxy resin or a base material formed by epoxy resin and polyester through a dispersant.

[0035] The epoxy resin is bisphenol A epoxy resin.

[0036] The curing agent is one or more of polyphenol curing agents, dicyandiamide, hydride curing agents, aromatic anhydrides, and aliphatic anhydrides.

[0037] The glass fiber is glass fiber powder.

[0038] Example 1

[0039] First, a primer is coated on the coating surface of the product. The primer can be a primer made of a base coating, or can be epoxy resin or other heat-resistant and insulating resins. In this example, the base coating is used as the primer. The specific operation is as follows: Based on the total weight of the coating, the content of epoxy resin in the base coating is 50% by weight, the content of the curing aid is 4.2% by weight, the content of glass fiber is 6% by weight, the content of cerium aluminum garnet is 34% by weight, the content of the dispersant is 0.8% by weight, the content of the flame retardant aid is 1% by weight, and the content of the conventional aid is 4% by weight. The conventional aid includes one or more of a leveling agent, a surfactant, and a pigment.

[0040] Mix the other materials in the base coating except for the glass fiber, and first coat a layer on the coating surface of the product as the primer. When the primer has not yet cured, lay the powder made of glass fiber on the primer, and then coat the remaining base mixed coating on the primer and the glass fiber layer. After it cures, coat the coating of the foaming layer on the outside of the cured base.

[0041] Based on the total weight of the coating of the foaming layer, the content of epoxy resin is 40% by weight, the content of the curing aid is 5.5% by weight, the content of the foaming agent is 5.5% by weight, the content of polyester is 30% by weight, the content of cerium aluminum garnet is 15% by weight, the content of the dispersant is 1% by weight, and the content of the conventional aid is 3% by weight. The conventional aid includes one or more of a leveling agent, a surfactant, and a pigment.

[0042] Example 2

[0043] The coating materials and structures of this example are substantially the same as those of Example 1. The difference is that the glass fiber layer in the base layer can be multiple layers. Except for one layer outside the primer, the remaining layers are distributed in the base coating, that is, the base coating is coated multiple times, and a layer of glass fiber is laid each time it is coated.

[0044] Comparative Example 1

[0045] The difference between this comparative example and Example 1 is that no foaming layer is provided. Based on the total weight of the coating, the content of epoxy resin in the base coating is 50% by weight, the content of curing aid is 4.2% by weight, the content of glass fiber is 6% by weight, the content of cerium aluminum garnet is 34% by weight, the content of dispersant is 0.8% by weight, the content of flame retardant aid is 1% by weight, and the content of conventional aid is 4% by weight, and this is used as the total coating amount.

[0046] The total amount of materials in Comparative Example 1 is the same as that in Example 1.

[0047] Comparative Example 2

[0048] The difference between this comparative example and Example 1 is that no cerium aluminum garnet is added, and other structures are the same, and the total amount of materials is also the same.

[0049] Experiment 1

[0050] Connect the positive and negative electrodes of the multimeter to the coating surface and the substrate surface respectively, then set the multimeter to the resistance test mode, and record the test results.

[0051] Product type Example 1 Example 2 Comparative example 1 Comparative example 2 Product insulation performance 10^11Ω 10^12Ω 10^9Ω 10^6Ω

[0052] It should be noted that this test result is the average value of multiple tests, and the total weight of each experimental coating used is the same, and the coating area is the same.

[0053] Experiment 2

[0054] The method of this experiment is to evenly coat different coatings on metal products of different round tubes with the same length. Uniformly heat the inside of the round tube to a specified temperature, and after maintaining for 10 minutes, measure the outer surface temperature of the middle coating of the round tube through multiple experiments and record the test results.

[0055] Note: The ambient temperature is 25°C.

[0056]

[0057] Experiment 3

[0058] This experiment is used to test the stability of the coating structures of Example 1 and Example 2, and it is found that the difference between Example 2 and Example 1 is that the structure of Example 2 has higher brittleness. The reason is the material characteristics of the glass fiber, so the number of layers of glass fiber needs to be set in combination with the coating thickness and requirements during use.

[0059] In summary, although the heat insulation effect and insulation of Example 2 are better, its structural brittleness is relatively high. By comprehensively considering Comparative Example 1 and Comparative Example 2, it can be concluded that adding cerium aluminum garnet to the coating can greatly improve the heat resistance and insulation effects, and setting a foaming layer can also improve the heat resistance and insulation effects.

[0060] The above description is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modification or change made by those of ordinary skill in the art according to the disclosure of the present invention should be included in the protection scope recorded in the claims.

Claims

1. An efficient heat-blocking and insulating battery coating, characterized in that: It includes a base layer and a foaming layer coated outside the base layer; The base layer is made of the following materials: based on the total weight of the base layer coating, 50-70% by weight of epoxy resin, 3-8% by weight of curing aid, 5-8% by weight of glass fiber, 30-40% by weight of cerium aluminum garnet, 0.5-2% by weight of dispersant, 0.5-3% by weight of flame retardant aid, and 3-6% by weight of conventional aid; The foaming layer is made of the following materials: based on the total weight of the foaming layer coating, 40-50% by weight of epoxy resin, 3-8% by weight of curing aid, 6-9% by weight of foaming agent, 30-35% by weight of polyester, 10-20% by weight of cerium aluminum garnet, 0.5-2% by weight of dispersant, and 6-8% by weight of conventional aid; wherein the ratio of the total weight of the foaming agent in the foaming layer to the total weight of epoxy resin and polyester is 0.5~1:10; The foaming agent is a physical foaming agent, and the physical foaming agent is a combination of one or more aliphatic hydrocarbons of hydrocarbons containing 5-7 carbons; The thermal conductivity of the cerium aluminum garnet is 0.06 W / (m·K); The conventional aid includes one or more of a leveling agent, a surfactant, and a pigment; The preparation method of the high-efficiency heat-resistant insulation battery coating includes the steps: S1, preparing the base layer: first coat a primer on the coating surface to increase the adhesiveness of the coating. Before the primer is cured, cover the coating surface with glass fiber, and then electrostatically spray the base layer mixed coating prepared from the mixed materials of epoxy resin, curing aid, cerium aluminum garnet, dispersant, flame retardant aid, and conventional aid prepared for the base layer on the glass fiber and the primer, and dry and cure; S2, preparing the foaming layer: fully mix and disperse the prepared foaming layer materials of epoxy resin, curing aid, foaming agent, polyester, cerium aluminum garnet, and dispersant, and then prepare the mixed and dispersed mixed materials into a foaming layer coating through a coating preparation process, and electrostatically spray the prepared foaming layer coating outside the base layer, and perform high-temperature foaming and curing; S3, complete the coating production after cooling; The glass fiber in the base layer is in multiple layers. Except for one layer outside the primer, the remaining layers are distributed in the base layer, that is, the base layer mixed coating is coated multiple times, and one layer of glass fiber is laid for each coating; 2. An efficient heat-resistant and insulating battery coating according to claim 1, characterized in that: The cerium aluminum garnet is cerium aluminum garnet powder formed by grinding cerium aluminum garnet raw materials, and the cerium aluminum garnet powder is uniformly dispersed in a base material formed by epoxy resin or epoxy resin and polyester through a dispersant; 3. An efficient heat-blocking and insulating battery coating according to claim 1, characterized in that: The epoxy resin is bisphenol A epoxy resin; 4. An efficient heat-resistant and insulating battery coating according to claim 1, characterized in that: The curing aid is a combination of one or more of a polyphenol curing agent, dicyandiamide, a hydride curing agent, an aromatic anhydride, and an aliphatic anhydride; 5. An efficient heat-resistant insulating battery coating according to claim 1, characterized in that: The glass fiber is glass fiber powder;

Images