A coating treatment liquid, a coating, a heat-insulating mica tube, and a preparation method and application thereof for preparing a heat-insulating mica tube

Abstract

This application relates to the technical field of mica materials, and specifically discloses a coating treatment liquid, a coating, a heat-insulating mica tube, and a preparation method and application thereof for preparing a heat-insulating mica tube. The coating treatment liquid disclosed in this application comprises the following components in parts by weight: 25-35 parts of aerogel powder, 15-35 parts of microsphere powder, 5-15 parts of glass powder, and 35-45 parts of silicone resin. This application also discloses a coating, a heat-insulating mica tube, and an application thereof prepared by using the above coating treatment liquid. By coating the mica tube substrate surface with the coating treatment liquid disclosed in this application, a heat-insulating mica tube is obtained. The prepared heat-insulating mica tube has excellent apparent characteristics, and also has excellent normal state withstand voltage, fire resistance and heat insulation performance.

Description

Technical Field

[0001] The present application relates to the technical field of mica materials, and specifically relates to a coating treatment liquid, a coating, a heat-insulating mica tube, and a preparation method and application thereof for preparing a heat-insulating mica tube. Background Art

[0002] With the integrated development of large motors, mica materials have electrical properties such as high electrical strength, low dielectric loss, high surface resistance, and high volume resistance, and are widely used in cables and large electromechanical equipment.

[0003] Currently, the main insulation structure of mica materials is developing towards thinner and more advanced directions. Thinner insulation is beneficial for increasing the single-machine capacity of motors, reducing the manufacturing cost of windings, and enhancing the market competitiveness of high-voltage motor products. However, the reduction in the thickness of the insulation structure poses higher requirements for the size and physical and chemical properties of mica tube materials.

[0004] In the market, mica tubes are mainly produced by rolling mica paper. Since mica itself is a semi-heat-insulating material, the heat-insulating performance of mica materials under high-temperature conditions is generally average, and the heat-insulating performance of the prepared mica tubes is poor. Therefore, there is an urgent need for a new preparation method to solve the above problems. Summary of the Invention

[0005] In order to solve the above technical problems and improve the heat-insulating performance of mica tubes, the present application provides a coating treatment liquid, a coating, a heat-insulating mica tube, and a preparation method and application thereof for preparing a heat-insulating mica tube.

[0006] In a first aspect, the present application provides a coating treatment liquid for preparing a heat-insulating mica tube, which includes the following components in parts by weight: 25 - 35 parts of aerogel powder, 15 - 35 parts of microsphere powder, 5 - 15 parts of glass powder, and 35 - 45 parts of silicone resin.

[0007] The present application uses the above specific parts by weight of aerogel powder, microsphere powder, glass powder, and silicone resin as the coating treatment liquid for preparing a heat-insulating mica tube. The heat-insulating mica tube is prepared by spraying the coating treatment liquid on a mica tube substrate. The surface of the prepared heat-insulating mica tube sample has no defects, and it has excellent withstand voltage performance, fire resistance performance, and heat-insulating performance.

[0008] The aerogel powder, microsphere powder, and glass powder used in the present application can fill the pores between fine particles of the coating treatment liquid, cooperate with each other synergistically, increase the compactness of the system, and thus can significantly improve the heat-insulating performance of the coating. The silicone resin has a very flexible main chain, with weak intermolecular forces, provides appropriate viscosity, weak surface tension, small surface energy, and strong film-forming ability, making the apparent structure of the coating treatment liquid good after spraying and forming.

[0009] The inorganic materials and organic substances in the coating treatment liquid can be well combined with the surface of the mica tube matrix, and cooperate with each other to improve the high-temperature insulation performance of the mica tube; the above coating treatment liquid can improve the performance of the mica tube and enhance its high-temperature insulation performance, and finally obtain a mica tube with good high-temperature insulation and excellent heat insulation performance.

[0010] Preferably, the coating treatment liquid comprises the following components in parts by weight: 25-35 parts of aerogel powder, 15-25 parts of microsphere powder, 5-15 parts of glass powder, and 35-45 parts of silicone resin.

[0011] Further, the coating treatment liquid comprises the following components in parts by weight: 30 parts of aerogel powder, 20 parts of microsphere powder, 10 parts of glass powder, and 40 parts of silicone resin.

[0012] Through experimental analysis, it can be known that when the particle sizes of the components in this application are within the above ranges, the breakdown voltage resistance and heat insulation of the heat-insulating mica tube can be further improved.

[0013] Preferably, the true density of the microsphere powder is 0.20-0.57 g / cm 3 .

[0014] Further, the true density of the microsphere powder is 0.27-0.48 g / cm 3 .

[0015] In a specific embodiment, the true density of the microsphere powder can be 0.20-0.22 g / cm 3 , 0.27-0.30 g / cm 3 , 0.33-0.37 g / cm 3 , 0.44-0.48 g / cm 3 , 0.53-0.57 g / cm 3 .

[0016] Preferably, the silicone resin is selected from one or more of hydroxyl silicone resin RY-JJ-03, vinyl phenyl silicone resin RY-BJG-04, phenyl hydrogen-containing silicone resin RY-BJG-02, and methyl silicone resin RY-ZNJ01.

[0017] Through experimental analysis, it can be known that by screening the above types of silicone resin in this application and controlling the true density of the microsphere powder within the above ranges, the breakdown voltage resistance and heat insulation of the heat-insulating mica tube can be further improved.

[0018] The preparation method of the above coating treatment liquid specifically comprises the following steps: After mixing the raw materials according to the parts by weight, mixing and stirring are carried out under the condition of stirring at a speed of not less than 500 rpm for not less than 60 min to prepare the coating treatment liquid.

[0019] During the preparation of the coating treatment liquid, when the stirring speed is lower than 500 rpm or the stirring time is shorter than 60 min, the treatment uniformity is poor, the added materials cannot be evenly stirred, and the performance of the prepared product is unstable; the stirring speed and stirring time in the preparation process of the coating treatment liquid are optimized in this application, and the obtained coating treatment liquid has excellent uniformity, which is convenient for the subsequent preparation of the heat-insulating mica tube.

[0020] In a second aspect, this application provides a coating, which is prepared by using the above coating treatment liquid for preparing the heat-insulating mica tube.

[0021] In a third aspect, this application provides a heat-insulating mica tube, which includes a mica tube matrix and the above coating.

[0022] Preferably, the thickness of the coating is 80 ± 10 μm.

[0023] In a fourth aspect, this application provides a method for preparing the above heat-insulating mica tube, which specifically includes the following steps:

[0024] Spray the above coating treatment liquid for preparing the heat-insulating mica tube on the surface of the mica tube matrix. After spraying, place it at 120 - 140 °C until the coating dries, and then the heat-insulating mica tube is obtained;

[0025] Preferably, the spraying conditions are: spraying temperature 80 - 100 °C, pressure 32 - 38 psi.

[0026] When spraying the coating treatment liquid on the surface of the mica tube matrix, if the spraying temperature is too low or the pressure is too small, the bonding force between the coating treatment liquid and the matrix surface is weak, and the coating treatment liquid has not formed a dry coating on the matrix surface, resulting in a falling-off phenomenon; if the spraying temperature is too high or the pressure is too large, it is easy for the coating treatment liquid to dry itself before it is fully combined with the matrix surface, or there are easily bad phenomena such as fuzzing and powder shedding on the surface of the finished mica tube.

[0027] In a fifth aspect, this application provides the use of the above coating treatment liquid or the above heat-insulating mica tube in the preparation of refractory insulating heat-insulating materials.

[0028] In summary, the technical solution of this application has the following effects:

[0029] This application uses specific parts by weight of aerogel powder, microsphere powder, glass powder, and silicone resin as the coating treatment liquid. The surface of the heat-insulating mica tube product prepared by spraying on the surface of the mica tube matrix has no defects, and has excellent withstand voltage performance, fire resistance performance, and heat insulation performance.

[0030] The preparation method of the heat-insulating mica tube provided by the present application is simple in operation, reduces the production cost, and avoids the occurrence of defects such as fracture, powder dropping, and cracking during the forming process of the heat-insulating mica tube by controlling the raw materials and specific process parameters.

[0031] By screening the true density of the microsphere powder and the type of silicone resin in the coating treatment liquid, the present application further improves the heat-insulating performance of the heat-insulating mica tube. Detailed implementation manners

[0032] The present application will be further described in detail below in combination with examples, comparative examples, and performance detection tests. These examples should not be construed as limiting the scope claimed by the present application.

[0033] Preparation examples

[0034] Preparation examples 1-11

[0035] Preparation examples 1-11 respectively provide a coating treatment liquid.

[0036] The differences in the coating treatment liquids in the above preparation examples are as follows: the dosages of the components in the coating treatment liquid are different, as shown in Table 1 specifically.

[0037] The preparation method of the coating treatment liquid in the above preparation examples is as follows:

[0038] According to the addition amounts shown in Table 1, take silica aerogel powder (KN-0683, purchased from Langfang Kenuo Building Materials Co., Ltd.), microsphere powder (YN35, true density 0.33-0.37 g / cm 3 , purchased from Guangzhou Yuanyuan New Materials Co., Ltd.), glass powder (800 mesh, purchased from Zhong'an Te Nano Technology Co., Ltd.), and silicone resin (hydroxyl silicone resin RY-JJ-03, purchased from Jiangxi Riyue New Materials Co., Ltd.) for mixing, and carry out mixing and stirring under the conditions of 500 rpm and a stirring time of 60 min to prepare the coating treatment liquid.

[0039] Table 1 Dosages of each component in the coating treatment liquid in preparation examples 1-11

[0040]

[0041]

[0042] Preparation examples 12-21

[0043] Preparation examples 12-21 respectively provide a coating treatment liquid.

[0044] The differences between the above preparation examples and preparation example 2 are specifically as follows:

[0045] In Preparation Example 12: The silicone resin was vinyl phenyl silicone resin RY-BJG-04, purchased from Jiangxi Riyue New Materials Co., Ltd.

[0046] In Preparation Example 13: The silicone resin was phenyl hydrogen-containing silicone resin RY-BJG-02, purchased from Jiangxi Riyue New Materials Co., Ltd.

[0047] In Preparation Example 14: The silicone resin was methyl silicone resin RY-ZNJ01, purchased from Jiangxi Riyue New Materials Co., Ltd.

[0048] In Preparation Example 15: The microbead powder was YN20, with a true density of 0.20 - 0.22 g / cm 3 , purchased from Guangzhou Yuanyuan New Materials Co., Ltd.

[0049] In Preparation Example 16: The microbead powder was YN28, with a true density of 0.27 - 0.30 g / cm 3 , purchased from Guangzhou Yuanyuan New Materials Co., Ltd.

[0050] In Preparation Example 17: The microbead powder was YN46, with a true density of 0.44 - 0.48 g / cm 3 , purchased from Guangzhou Yuanyuan New Materials Co., Ltd.

[0051] In Preparation Example 18: The microbead powder was YN55, with a true density of 0.53 - 0.57 g / cm 3 , purchased from Guangzhou Yuanyuan New Materials Co., Ltd.

[0052] In Preparation Example 19: The silicone resin was replaced with a silicone rubber emulsion (model 5468, purchased from Shenzhen Shengtian Silicone Rubber Materials Technology Co., Ltd.).

[0053] In Preparation Example 20: The microbead powder was replaced with glass powder (800 mesh, purchased from Zhong'an Te Nano Technology Co., Ltd.).

[0054] In Preparation Example 21: The microbead powder was replaced with ceramic powder (800 mesh, purchased from Zhong'an Te Nano Technology).

[0055] Examples

[0056] Examples 1 - 10

[0057] Examples 1 - 10 each provided a heat-insulating mica tube.

[0058] The differences between the above examples were as follows: The sources of the coating treatment liquid were different, as specifically shown in Table 2.

[0059] The specific steps of the preparation method of the heat-insulating mica tube in the above examples were as follows:

[0060] Take a mica tube (with the specification model of HP-5, sourced from Yangzhou Shangke Electric Power Equipment Co., Ltd.) as the substrate. Under the conditions of a spraying temperature of 90°C and a pressure of 35 psi, after spraying the coating treatment liquid, place it at 130°C until the coating dries. Then, an insulating mica tube with a coating thickness of 80 ± 10 μm is obtained.

[0061] Table 2 Sources of the coating treatment liquid in Examples 1-10

[0062]

[0063] Comparative example

[0064] Comparative examples 1-11

[0065] Comparative examples 1-11 each provided a mica tube.

[0066] The differences between the above comparative examples and Example 1 are as follows: the sources of the coating treatment liquid are different, as shown in Table 3 specifically. The preparation methods of the mica tubes in the above comparative examples and Example 1 are the same.

[0067] Table 3 Sources of the coating treatment liquid in Comparative examples 1-11

[0068]

[0069] Comparative example 12

[0070] This comparative example provided a common mica tube.

[0071] The mica tube in this comparative example has the specification model of HP-5 and is sourced from Yangzhou Shangke Electric Power Equipment Co., Ltd.

[0072] For the performance detection test, the mica tubes provided by Examples 1-10 and Comparative examples 1-12 were used as the detection objects, and the following performances of the mica tubes were detected.

[0073] (1) Apparent characteristics: Observe whether the surface of the insulating mica tube product is flat and whether there are defects such as powder shedding, cracks, bubbles, and pockmarks.

[0074] (2) Bonding strength: According to ASTM C633-2013 "Standard Test Method for Adhesion or Cohesive Strength of Thermal Spray Coatings", detect the bonding strength between the coating and the mica tube substrate.

[0075] (3) Normal state withstand voltage: Refer to GB / T5019.2-2009 "Insulating Materials Based on Mica" Part 2: Test Methods to detect the normal state withstand voltage performance of the cable. The normal state withstand voltage can reflect the insulation performance of the cable.

[0076] (4) Fire resistance: The fire resistance of the heat-insulating mica tube was inspected by the method specified in GBT19216.11-2003.

[0077] (5) Heat insulation: Referring to the test method of "GB / T 25352-2010 Test Method for Fire Penetration Resistance of Heat Insulating and Sound Insulating Materials", one side of the heat-insulating mica tube was burned with a 1000°C flame, and the temperature on the other side was detected; the heat insulation calculation formula is: Heat insulation = (1000 - R) / 1000 × 100%, where represents the burning temperature on one side of the mica tube, which is 1000°C; R (°C) represents the temperature on the other side of the mica tube.

[0078] Test results: As shown in Table 4.

[0079] Table 4 Performance test results of heat-insulating mica tubes in Examples 1-10 and Comparative Examples 1-12

[0080]

[0081]

[0082]

[0083] Combined with Table 4, by comparing the performance of the heat-insulating mica tubes in Examples 1-10 and Comparative Examples 1-12, it can be seen that in this application, specific parts by weight of aerogel powder, microsphere powder, glass powder, and silicone resin are used as the coating treatment liquid, which is coated on the surface of the mica tube substrate to obtain a heat-insulating mica tube. There are no defects on the surface of the sample, the bonding strength between the coating and the mica tube substrate is 70-83 MPa, the normal state withstand voltage of the heat-insulating mica tube is 60-66 Mv / mm, the fire resistance is 805-855 °C, and the heat insulation reaches 70.7-80.2%. The above test results show that using the coating treatment liquid provided in this application as the coating of the mica tube, the prepared product has no defects on the surface, the bonding force between the coating and the mica tube substrate surface is strong, and the withstand voltage, fire resistance, and heat insulation are excellent.

[0084] By comparing the test results of Examples 1-3 and Comparative Examples 1-8, it can be seen that the addition ratio of each raw material in the coating treatment liquid has a great influence on the subsequent apparent characteristics and performance of the heat-insulating mica tube; when the raw material ratio is too much or too little, the heat-insulating mica tube is prone to defects such as powder falling, pitting, and rough surface, and the normal state withstand voltage, fire resistance, and heat insulation of the prepared heat-insulating mica tube are also poor.

[0085] By comparing the test results of Example 1 and Comparative Example 9, it can be seen that when choosing to use silicone rubber emulsion instead of silicone resin and adding it to the coating treatment liquid, the fire resistance and heat insulation of the heat-insulating mica tube are poor; while the present application selects silicone resin as the raw material component of the coating treatment liquid, and the prepared heat-insulating mica tube has excellent normal withstand voltage, fire resistance and heat insulation. Further, by comparing the test results of Example 1 and Examples 4-6, the present application screens the type of silicone resin as hydroxy silicone resin RY-JJ-03, which can further improve the fire resistance and heat insulation of the heat-insulating mica tube.

[0086] By comparing the test results of Example 1 and Comparative Examples 10-11, it can be seen that when choosing to use glass powder or ceramic powder instead of microsphere powder and adding it to the coating treatment liquid, the fire resistance and heat insulation of the heat-insulating mica tube are poor; while the present application selects microsphere powder as the raw material component of the coating treatment liquid, and the prepared heat-insulating mica tube has excellent normal withstand voltage, fire resistance and heat insulation. Further, by comparing the test results of Example 1 and Examples 7-10, the present application controls the true density of the microsphere powder to be 0.27-0.48 g / cm 3 , which further improves the withstand voltage and fire resistance of the heat-insulating mica tube.

[0087] Although the present invention has been described in detail above with general descriptions and specific embodiments, on the basis of the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A coating treatment liquid for preparing heat-insulating mica tubes, characterized in that, It consists of the following components in parts by weight: 25-35 parts of silica aerogel powder, 15-35 parts of microsphere powder, 5-15 parts of glass powder, and 35-45 parts of hydroxyl silicone resin RY-JJ-03; the true density of the microsphere powder is 0.27-0.48 g / cm 3 .

2. The coating treatment liquid for preparing the heat-insulating mica tube according to claim 1, characterized in that, It consists of the following components in parts by weight: 30 parts of silica aerogel powder, 20 parts of microsphere powder, 10 parts of glass powder, and 40 parts of hydroxyl silicone resin RY-JJ-03.

3. A coating, characterized in that, It is prepared by using the coating treatment liquid for preparing the heat-insulating mica tube described in any one of claims 1-2.

4. A heat-insulating mica tube, characterized in that, It includes a mica tube substrate and the coating described in claim 3.

5. The heat-insulating mica tube according to claim 4, wherein, The thickness of the coating is 80 ± 10 μm.

6. The preparation method of the heat-insulating mica tube according to any one of claims 4-5, characterized in that, Specifically, it includes the following steps: Spray the coating treatment liquid for preparing the heat-insulating mica tube described in any one of claims 1-2 on the surface of the mica tube substrate. After spraying, place it at 120-140 °C until the coating dries, and then the heat-insulating mica tube is obtained. The spraying conditions are: spraying temperature 80-100 °C, pressure 32-38 psi.

7. Use of the coating treatment liquid for preparing the heat-insulating mica tube described in any one of claims 1-2 or the heat-insulating mica tube described in any one of claims 4-5 in the preparation of a refractory insulating heat-insulating material.

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