Preparation method of mica melamine composite material and mica melamine composite cotton

Abstract

The invention discloses a preparation method of a mica melamine composite material and mica melamine composite cotton. The preparation method comprises the following steps: preparing a high-temperature-resistant adhesive; coating a high-temperature-resistant adhesive on one side of the mica; melamine foam is attached to the mica gluing face in the step S2, and an attached body is formed; the preparation process is simple, the effect in the field of heat preservation and heat insulation is outstanding, and the composite material is an ideal hard thermal runaway protection material, has excellent buffering capacity and heat insulation effect during charging and discharging, and has the effect that the composite material is not worn at the temperature of 1300 DEG C for 30 minutes.

Description

Technical Field

[0001] This invention relates to a method for preparing a mica-melamine composite material and a mica-melamine composite cotton. Background Technology

[0002] In many fields such as industrial production, new energy, and transportation, the performance of flame-retardant insulation materials directly affects the safety, energy efficiency, and environmental friendliness of equipment operation.

[0003] Currently, the traditional flame-retardant insulation materials widely used in the market are mainly rock wool and glass fiber. Although these materials have a certain flame-retardant effect, they have inherent defects such as being thick, brittle, and prone to shedding. This not only makes it difficult for their flame-retardant insulation performance to meet the needs of high-end applications, but also has a negative impact on human health and the ecological environment during production, use, and disposal, thus limiting their promotion and application in high-end scenarios.

[0004] Therefore, developing a method for preparing mica-melamine composite materials that are highly adaptable, low-cost, and fast-curing, and that can give the composite materials excellent comprehensive properties such as thermal insulation, flame retardancy, flexibility, and electrical insulation, as well as mica-melamine composite cotton, has become an urgent need in the industry. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for preparing a mica-melamine composite material.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for preparing a mica-melamine composite material, comprising the following steps: Step S1, preparing a high-temperature resistant adhesive, selecting a two-component inorganic adhesive as the high-temperature resistant binder; Step S2, selecting mica with a thickness of 0.05-5mm, and coating one side of the mica with the high-temperature resistant adhesive prepared in Step S1; Step S3, attaching melamine foam to the adhesive surface of the mica in Step S2 to form an adhesive body; Step S4, curing the adhesive body obtained in Step S3 at a temperature of 65-200℃ for 0-30min to obtain a composite material of mica and melamine foam.

[0007] The technical problem to be solved by the present invention is to provide a mica-melamine composite cotton.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a mica-melamine composite cotton, which adopts the above-mentioned method for preparing mica-melamine composite material, and sequentially includes a mica layer, a high-temperature resistant adhesive layer coated on the surface of the mica layer, and a melamine foam layer coated on the surface of the high-temperature resistant adhesive layer.

[0009] In some embodiments, the mica layer is a mica paper layer or a mica board layer.

[0010] In some embodiments, the mica layer is a muscovite layer, a phlogopite layer, or a fiberglass mica layer.

[0011] In some embodiments, the high-temperature resistant adhesive layer is a two-component inorganic adhesive layer, which is one or more of silicate-based two-component inorganic adhesives, aluminum sulfate-based two-component inorganic adhesives, and phosphate-based two-component inorganic adhesives.

[0012] In some embodiments, component A of the two-component inorganic adhesive is an aqueous liquid component, and component B is an inorganic powder component, with A:B = 1-5:1.

[0013] In some embodiments, the melamine foam layer is a hydrophilic melamine foam layer or a hydrophobic melamine foam layer.

[0014] In some embodiments, the hydrophobic melamine foam layer is a melamine foam layer prepared by a bio-wax / natural wax impregnation method or a low surface energy material grafting / coating method, and its water contact angle is >140°.

[0015] In some embodiments, the thickness of the melamine foam layer is 1.0-10 mm.

[0016] In some embodiments, the thickness of the high-temperature resistant adhesive layer is 0.05-0.5 mm.

[0017] The scope of this invention is not limited to technical solutions formed by specific combinations of the above-described technical features, but also includes other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this application.

[0018] Due to the application of the above technical solutions, the present invention has the following advantages compared with the prior art: The present invention provides a method for preparing mica-melamine composite material and mica-melamine composite cotton. The layered structure of mica can withstand high temperature environments of 900-1200℃ for a long time. Its lightweight and dense structure gives it a V0 flame retardant rating. In addition, its extremely high resistivity and breakdown voltage maintain excellent insulation performance at high temperatures. It can be widely used in high-end fields such as new energy vehicle battery packs, energy storage systems, and industrial equipment insulation. It is one of the most comprehensive protective materials with heat insulation, flame retardant, electrical insulation and environmental protection properties. Melamine foam is chemically stable, possesses high porosity, a lightweight mesh structure, and flame-retardant and thermal insulation properties. It can operate for extended periods in environments ranging from -140°C to 220°C. Its fiber structure exhibits high flexibility and tensile strength, making it easy to process and providing excellent thermal insulation performance. The composite method of combining mica and melamine foam results in a simple composite material preparation process with outstanding performance in the field of thermal insulation. It is also an ideal rigid thermal runaway protection material, providing excellent buffering capacity and high thermal insulation effect during charging and discharging, and exhibiting fire resistance up to 1300°C for 30 minutes without penetration. Composite materials prepared using hydrophilic melamine foam have excellent absorption capacity for acid and alkali solvents, effectively preventing battery leakage. Composite materials prepared using hydrophobic melamine foam, on the other hand, have waterproof, buffering, and sound absorption properties. Attached Figure Description

[0019] Appendix Figure 1 This is a schematic diagram of the structure of mica-melamine composite cotton. Appendix Figure 2 These are the refractory spray test diagrams for Example 3 and Comparative Example 3; Appendix Figure 3 This is a schematic diagram showing the peeling process of the sample in Example 1; Appendix Figure 4 This is a schematic diagram illustrating the peeling process of the sample in Comparative Example 3. Appendix Figure 5 These are images showing the surface waterproofing effects of Example 4 and Comparative Example 4. The structure consists of: 1. mica layer; 2. high-temperature resistant adhesive layer; 3. melamine foam layer. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Comparative tests were conducted on the back side temperature after being kept at 300°C for 20 minutes, the highest back side temperature after being flame-sprayed at 1300°C for 30 minutes, the 25% compressive strength, and the adhesion strength.

[0021] like Figure 1The mica-melamine composite cotton shown includes, from top to bottom, a mica layer 1, a high-temperature resistant adhesive layer 2 coated on the surface of the mica layer 1, and a melamine foam layer 3 coated on the surface of the high-temperature resistant adhesive layer 2.

[0022] The mica layer 1 has a thickness of 0.05-5mm, the melamine foam layer 3 has a thickness of 1.0-10mm, and the high-temperature resistant adhesive layer 2 has a thickness of 0.05-0.5mm.

[0023] Mica layer 1 is a muscovite layer, phlogopite layer, or fiberglass mica layer. High-temperature resistant adhesive layer 2 is a two-component inorganic adhesive layer, one or more of silicate-based, aluminum sulfate-based, and phosphate-based two-component inorganic adhesives. Component A of the two-component inorganic adhesive is an aqueous liquid component, and component B is an inorganic powder component, with an A:B ratio of 1-5:1. Melamine foam layer 3 is a hydrophilic or hydrophobic melamine foam layer. The hydrophobic melamine foam layer is prepared by a bio-wax / natural wax impregnation method or a low surface energy material grafting / coating method, and its water contact angle is >140°.

[0024] The preparation method of the above-mentioned mica-melamine composite cotton includes the following steps: Step S1, preparing a high-temperature resistant adhesive, using a two-component inorganic adhesive as the high-temperature resistant binder; Step S2, selecting mica with a thickness of 0.05-5mm, and coating one side of the mica with the high-temperature resistant adhesive prepared in Step S1; Step S3, attaching melamine foam to the adhesive surface of the mica in Step S2 to form an adhesive body; Step S4, curing the adhesive body obtained in Step S3 at a temperature of 65-200℃ for 0-30min to obtain a composite material of mica and melamine foam.

[0025] Example 1: A method for preparing a composite material of mica and melamine foam, comprising the following steps: Step 1: preparing a two-component sodium silicate high-temperature resistant adhesive according to the ratio of A:B=2:1; Step 2: coating a 0.15mm thick mica paper with the high-temperature resistant adhesive; Step 3: applying a 3.0mm thick mica paper with a density of 8kg / m³ to a mica paper. 3 Step 4: The hydrophilic melamine foam is bonded to the mica paper from step 2; Step 5: The prepared composite material is cured at 100℃ for 2 minutes to obtain the composite material of mica paper and melamine foam.

[0026] In this embodiment, the overall thickness of the composite material after curing is approximately 3.2 mm.

[0027] The peeling situation in this embodiment is as follows: Figure 3 As shown, the high-temperature resistant adhesive has high strength, and the melamine foam is destroyed when it is peeled off.

[0028] Example 2: A method for preparing a composite material of mica and melamine foam, comprising the following steps: Step 1: preparing a two-component aluminum silicate high-temperature resistant adhesive according to the ratio of A:B=1:1; Step 2: coating a 0.3mm thick mica paper with the high-temperature resistant adhesive, the coating thickness being 0.1mm; Step 3: applying a 1.0mm thick mica paper with a density of 5kg / m³ to the mica paper. 3 Step 4: The hydrophilic melamine foam is bonded to the mica board from step 2; Step 5: The prepared composite material is cured at 80℃ for 5 minutes to obtain the composite material of mica board and melamine foam.

[0029] In this embodiment, the overall thickness of the composite material after curing is approximately 1.25 mm.

[0030] Example 3: A method for preparing a composite material of mica and melamine foam, comprising the following steps: Step 1: preparing a two-component aluminum phosphate high-temperature resistant adhesive according to the ratio of A:B=4:1; Step 2: coating a 0.2mm thick mica paper with the high-temperature resistant adhesive, the coating thickness being 0.3mm; Step 3: applying a 5.0mm thick mica paper with a density of 16kg / m³ to the mica paper. 3 Step 4: The hydrophilic melamine foam is bonded to the mica paper from step 2; Step 5: The prepared composite material is cured at 120℃ for 3 minutes to obtain the composite material of mica paper and melamine foam.

[0031] In this embodiment, the overall thickness of the composite material after curing is approximately 5.3 mm.

[0032] The hydrophobic effect of this embodiment is as follows: Figure 5 As shown in the left figure.

[0033] Example 4: The implementation steps are the same as in Example 3, except that a material with a thickness of 5.0 mm and a density of 16 kg / m³ is selected. 3 Hydrophobic melamine foam was used to prepare composite materials.

[0034] In this embodiment, the overall thickness of the composite material after curing is approximately 5.3 mm.

[0035] Comparative Example 1: A sample with a thickness of 3.2 mm and a density of 8 kg / m³ was selected. 3 The hydrophilic melamine foam was compared with that in Example 1.

[0036] Comparative Example 2: Three mica papers with thicknesses of approximately 0.5 mm, 0.5 mm, and 0.25 mm were stacked and clamped together to form a mica board with a total thickness of approximately 1.25 mm, and a comparative test was conducted with Example 2.

[0037] Comparative Example 3: Includes the following steps: Step 1: Prepare a water-based polyurethane adhesive to bond mica paper or mica board and melamine foam; Step 2: Coat a 0.15mm thick mica paper with a high-temperature resistant adhesive; Step 3: Apply a 3.0mm thick mica paper with a density of 8kg / m³ to the mica paper. 3 Step 4: The hydrophilic melamine foam is bonded to the mica paper from step 2; Step 5: The prepared composite material is cured at 100℃ for 10 minutes to obtain the composite material of mica paper and melamine foam.

[0038] In this embodiment, the overall thickness of the composite material after curing is approximately 3.2 mm, compared with Example 1.

[0039] The peeling condition of the sample in Comparative Example 3 is as follows Figure 4 As shown, increased thickness of the water-based polyurethane adhesive coating will seep out onto the melamine foam surface, forming irregular coating spots (circled). The bonding strength between some melamine foam and mica paper or mica board is low, leading to partial breakage of the melamine foam.

[0040] Comparative Example 4: A sample with a thickness of 5.3 mm and a density of 16 kg / m³ was selected. 3 The hydrophobic melamine foam was compared with that in Example 4.

[0041] The performance tests of the above embodiments and comparative examples are compared, and the results are shown in the table below: Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 300°C / 20 min back face temperature / °C 126 235 95 100 152 226 135 89 1300°C flame spray 30 min back face temperature / °C 483.6 685.2 282.8 289.3 Melamine burn through 702.4 711.7 Melamine burn through 25% compression strength KPa 7.202 1.523 11.047 11.526 7.506 / 7.105 12.035 Adhesive strength Breakage Breakage Breakage Breakage / / Partial breakage / .

[0042] Based on the test results of Example 1 and Comparative Example 1, the use of inorganic high-temperature resistant adhesive has a good improvement on the heat insulation effect of composite materials. After being kept at 300°C for 20 minutes, the back heat insulation effect was measured to decrease from 152°C in Comparative Example 1 to 126°C in Example 1, and the heat insulation efficiency increased to 58%.

[0043] After being sprayed under a flame at 1300℃ for 30 minutes, the melamine foam in Comparative Example 1 was directly burned through, but the composite material with mica paper or mica board only had the surface melamine burned through, while the high-temperature adhesive and mica paper or mica board still played a role in flame retardancy and fireproofing.

[0044] The test in Comparative Example 2 shows that stacking mica paper alone improves the flame retardant effect to a certain extent, but the composite with melamine foam not only improves the heat insulation effect, but also provides a certain compressive strength, which improves the cushioning effect of the composite material itself.

[0045] Comparative Example 3 uses water-based polyurethane adhesive as a binder to bond mica and melamine foam. Due to the organic properties of water-based adhesive, the curing time is longer and the bonding strength between mica and melamine foam is lower, resulting in lower overall thermal insulation and fireproof performance than Example 1.

[0046] Compared with Example 3, Example 4 differs in the waterproof effect of the melamine foam surface. The other test results are similar. However, the tests of Examples 1 and 4 show that, regardless of whether it is hydrophilic or hydrophobic, the fire-resistant effect of melamine foam alone is poor and it cannot isolate the burning of open flames.

[0047] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing a mica-melamine composite material, characterized in that: Includes the following steps: Step S1: Prepare a high-temperature resistant adhesive, using a two-component inorganic adhesive as the high-temperature resistant binder; Step S2: Select mica with a thickness of 0.05-5mm and coat one side of the mica with the high-temperature resistant adhesive prepared in step S1. Step S3: Adhere the melamine foam to the adhesive surface of the mica from step S2 to form an adhesive body; Step S4: The laminate obtained in step S3 is cured at 65-200℃ for 0-30 minutes to obtain a composite material of mica melamine foam.

2. A mica-melamine composite cotton, prepared by the method for preparing the mica-melamine composite material as described in the claims, characterized in that: It includes, in sequence, a mica layer (1), a high-temperature resistant adhesive layer (2) coated on the surface of the mica layer (1), and a melamine foam layer (3) coated on the surface of the high-temperature resistant adhesive layer (2).

3. The mica-melamine composite cotton according to claim 2, characterized in that: The mica layer (1) is a mica paper layer or a mica board layer.

4. The mica-melamine composite cotton according to claim 3, characterized in that: The mica layer (1) is a muscovite layer, a phlogopite layer, or a fiberglass mica layer.

5. The mica-melamine composite cotton according to claim 2, characterized in that: The high-temperature resistant adhesive layer (2) is a two-component inorganic adhesive layer, one or more of the following: silicate two-component inorganic adhesive layer, aluminum sulfate two-component inorganic adhesive layer, and phosphate two-component inorganic adhesive layer.

6. The mica-melamine composite cotton according to claim 5, characterized in that: The two-component inorganic adhesive layer includes a component A layer and a component B layer. Component A is an aqueous liquid component, and component B is an inorganic powder component, with A:B = 1-5:

1.

7. The mica-melamine composite cotton according to claim 2, characterized in that: The melamine foam layer (3) is a hydrophilic melamine foam layer or a hydrophobic melamine foam layer.

8. The mica-melamine composite cotton according to claim 7, characterized in that: The hydrophobic melamine foam layer (3) is a melamine foam layer prepared by biological wax / natural wax impregnation or low surface energy material grafting / coating method, and its water contact angle is >140°.

9. The mica-melamine composite cotton according to claim 2, characterized in that: The thickness of the melamine foam layer (3) is 1.0-10 mm.

10. The mica-melamine composite cotton according to claim 2, characterized in that: The thickness of the high-temperature resistant adhesive layer (2) is 0.05-0.5 mm.

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