Basalt flake insulation paper, preparation method thereof and insulation wrapping tape for cable

Abstract

The invention discloses basalt flake insulation paper, a preparation method thereof and an insulation wrapping tape for cables, and belongs to the technical field of insulation paper for cables, and the basalt flake insulation paper comprises the following components in parts by weight: 5-15 parts of basalt flakes, 1-3 parts of a thickening agent, 10-30 parts of basalt chopped fibers, 5-20 parts of basalt powder and 200-500 parts of water. According to the invention, basalt scales are adopted as a raw material, and a thickening agent and the like are added to adjust the viscosity and the stability of the basalt scale slurry; the basalt chopped fibers and the basalt powder are added to fill gaps among the basalt flake stacks, so that the tensile strength of the basalt flake flame-retardant and high-temperature-resistant insulation paper is improved; all the components act together to obtain the basalt flake flame-retardant high-temperature-resistant insulation paper. When the insulating wrapping tape for the cable is prepared, the technical problem that an existing insulating wrapping tape for the cable is poor in working performance in a high-temperature environment can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of insulating paper for cables, and in particular to basalt flake insulating paper and a preparation method thereof, and an insulating wrapping tape for cables. Background Art

[0002] At present, the flame-retardant and high-temperature resistant insulation paper for cables mainly uses mica sheets as raw materials, which are made into mica paper by a rotary paper machine. According to the different types of mica, it can be divided into three categories: phlogopite paper, muscovite paper, and synthetic mica paper; according to whether the raw materials are calcined and processed, it can be divided into calcined mica paper and non-calcined mica paper. Since mica has a lamellar structure and belongs to silicate minerals, it has the characteristics of flame retardancy, high temperature resistance, insulation, etc. The mica ore is crushed and screened, and the mica sheet suspension is prepared by hydraulic crushing and stripping. Then, the larger mica particles and gravel are separated by a hydrocyclone to obtain a suspension solution that meets the mica paper making process. Then, a certain thickener, stabilizer, defoamer, chopped fiber, etc. are added to make mica paper by a rotary paper machine, and then dried, cut and packaged. Mica paper is compounded with alkali-free glass fiber cloth and polyimide film through silicone resin or epoxy resin to form an insulating wrapping tape for cables.

[0003] However, since ordinary mica minerals contain crystal water, the insulation layer used in the high-temperature resistant insulation wrapping tape of cables will lose crystal water at 600°C due to the rise in temperature, which will destroy the structure of muscovite; phlogopite loses crystal water at 800°C, which will destroy the structure of phlogopite. Synthetic mica uses artificial synthesis methods to replace the silicon hydroxyl groups in the mica structure with fluorine atoms. The structure of synthetic mica will be destroyed at around 1000°C, which will eventually lead to the failure of the electrical insulation performance of the cable insulation wrapping tape under high temperature conditions. Since the melting point of mica is usually around 1130°C, the cable insulation layer material prepared from mica sheets will completely fail at higher operating temperatures. Summary of the invention

[0004] The purpose of the present invention is to provide a basalt flake insulation paper and a preparation method thereof, and an insulation wrapping tape for a cable, so as to solve the technical problem that the existing insulation wrapping tape for a cable has poor working performance in a high temperature environment (>800°C).

[0005] In a first aspect, an embodiment of the present application provides a basalt flake insulation paper, which comprises the following components in parts by weight:

[0006] 5-15 parts of basalt flakes, 1-3 parts of thickener, 10-30 parts of basalt chopped fibers, 5-20 parts of basalt powder and 200-500 parts of water.

[0007] Furthermore, the basalt flake insulation paper comprises the following components in parts by weight:

[0008] 10 parts of basalt flakes, 2 parts of thickener, 20 parts of basalt chopped fibers, 15 parts of basalt powder and 400 parts of water.

[0009] Furthermore, the thickness of the basalt flakes is 3 to 5 microns, and the diameter is 0.03 to 5 millimeters; the basalt flakes are obtained by surface treatment with a silane coupling agent.

[0010] Furthermore, the thickener includes at least one of guar gum, hydroxypropyl cellulose, carboxymethyl cellulose and polyacrylamide.

[0011] Furthermore, the basalt flake insulation paper further comprises, by weight: 0.5 to 2 parts of a dispersant (such as sodium polyacrylate).

[0012] In a second aspect, an embodiment of the present application provides a method for preparing the basalt flake insulation paper according to the first aspect, the preparation method comprising:

[0013] Silane coupling agent is used to perform surface treatment on basalt flakes to obtain surface treated basalt flakes;

[0014] The surface-treated basalt flakes, thickener, basalt chopped fibers, basalt powder and water are mixed to obtain basalt flake slurry;

[0015] The basalt flake slurry is paper-made to obtain basalt flake insulation paper.

[0016] Furthermore, the step of surface treating the basalt flakes with a silane coupling agent to obtain the surface-treated basalt flakes includes: adding the basalt flakes to an ethanol aqueous solution containing a silane coupling agent (such as silane coupling agent KH550) and performing ultrasonic treatment for 30-60 minutes.

[0017] In a third aspect, an embodiment of the present application provides an insulating wrapping tape for a cable, wherein the insulating wrapping tape for a cable is made of the basalt flake insulating paper described in any one of the first aspects.

[0018] Furthermore, the cable insulation wrapping tape comprises the following components in parts by weight:

[0019] The basalt flake insulation paper described in the first aspect is 30-50 parts, the alkali-free glass fiber cloth is 20-40 parts, the polyimide film is 10-25 parts and the resin (such as epoxy resin) is 15-35 parts.

[0020] Compared with the prior art, the above solution provided by the embodiment of the present application has at least the following beneficial effects:

[0021] The embodiment of the present application provides a basalt flake insulation paper, which adopts basalt flakes as raw materials, adds thickeners (hydroxypropyl cellulose, carboxymethyl cellulose, guar gum, polyacrylamide) and the like to adjust the viscosity of the basalt flake slurry and the stability of the slurry; adds basalt chopped fibers and basalt powder to fill the gaps between the stacked basalt flakes, thereby improving the tensile strength of the basalt flake flame retardant and high temperature resistant insulation paper; and the components work together to obtain a basalt flake flame retardant and high temperature resistant insulation paper.

[0022] When the basalt flake insulation paper is used to prepare insulation wrapping tape for cables, under high temperature conditions, the basalt flake flame retardant and high temperature resistant insulation paper does not release small molecules such as crystal water, and the thermal stability of the material structure is significantly improved (muscovite loses crystal water at around 600°C, phlogopite loses crystal water at 800°C, and synthetic mica loses fluorine atoms at around 1000°C, which ultimately leads to structural destruction of the mica, loss of structural strength and electrical insulation, and failure of the insulation wrapping tape for cables). The maximum operating temperature of basalt flake flame-retardant and high-temperature resistant insulating paper material is increased from muscovite paper (600℃), phlogopite paper (800℃), and synthetic mica paper (1000℃) to 1100℃, thereby improving the thermal stability of the insulating wrapping tape for cables. During the heating process, no small molecules such as crystalline water are released from the insulating layer, thereby effectively solving the technical problem of poor working performance of existing insulating wrapping tapes for cables in high temperature environments (>800℃). At the same time, the production of basalt flakes does not require other chemical modifications. It is made from natural basalt ore as raw material and has the characteristics of being green, environmentally friendly and pollution-free. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic flow chart of a method for preparing basalt flake insulation paper provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to specific embodiments.

[0027] The overall idea of ​​the technical solution provided by the embodiment of the present invention is as follows:

[0028] In a first aspect, an embodiment of the present application provides a basalt flake insulation paper, which comprises the following components in parts by weight:

[0029] 5-15 parts of basalt flakes, 1-3 parts of thickener, 10-30 parts of basalt chopped fibers, 5-20 parts of basalt powder and 200-500 parts of water.

[0030] The embodiment of the present application provides a basalt flake insulation paper, which uses basalt flakes as raw materials and is matched with an appropriate amount of basalt chopped fibers and basalt powder. The components work together to obtain basalt flake flame-retardant and high-temperature resistant insulation paper. The synergistic effects between the components are as follows:

[0031] The basalt scales are formed into paper through the mutual overlapping of electrostatic forces, hydrogen bonding forces, and van der Waals forces. The scales are filled with basalt powder and basalt fibers to improve the tensile strength of the basalt scale flame-retardant and high-temperature resistant insulation paper. The reasonable size and particle size distribution of the basalt scales ensure that the basalt flame-retardant and high-temperature resistant insulation paper can be perfectly stacked, achieving high tensile strength and good electrical insulation. In the direction perpendicular to the basalt flame-retardant and high-temperature resistant insulation paper, the perfect stacking of basalt scales and the good filling of the gaps between the scales by basalt fibers and basalt particles achieve good electrical insulation in the vertical direction of the paper surface.

[0032] Therefore, this application adopts basalt flakes as raw materials, and adds thickeners (hydroxypropyl cellulose, carboxymethyl cellulose, guar gum, polyacrylamide) to adjust the viscosity and stability of basalt flake slurry; adds basalt chopped fibers and basalt powder to fill the gaps between the stacked basalt flakes to improve the tensile strength of basalt flake flame-retardant and high-temperature resistant insulation paper; the components work together to obtain a basalt flake flame-retardant and high-temperature resistant insulation paper. When it is used to prepare insulation wrapping tape for cables, under high temperature conditions, the basalt flake flame-retardant and high-temperature resistant insulation paper does not release small molecules such as crystal water, and the thermal stability of the material structure is significantly improved (muscovite loses crystal water at about 600°C, phlogopite loses crystal water at 800°C, and synthetic mica loses fluorine atoms at about 1000°C, which ultimately leads to the destruction of the mica structure, loss of structural strength and electrical insulation, and failure of the insulation wrapping tape for cables). The maximum operating temperature of basalt flake flame-retardant and high-temperature resistant insulating paper material is increased from muscovite paper (600℃), phlogopite paper (800℃), and synthetic mica paper (1000℃) to 1100℃, thereby improving the thermal stability of the insulating wrapping tape for cables. During the heating process, no small molecules such as crystalline water are released from the insulating layer, thereby effectively solving the technical problem of poor working performance of existing insulating wrapping tapes for cables in high temperature environments (>800℃). At the same time, the production of basalt flakes does not require other chemical modifications. It is made from natural basalt ore as raw material and has the characteristics of being green, environmentally friendly and pollution-free.

[0033] As an implementation method of the present application, the basalt flake insulation paper includes the following components in parts by weight:

[0034] 10 parts of basalt flakes, 2 parts of thickener, 20 parts of basalt chopped fibers, 15 parts of basalt powder and 400 parts of water.

[0035] When the components of the present application are controlled to be in the above ratio, the comprehensive performance of the obtained basalt flake insulation paper is good.

[0036] As an implementation method of an embodiment of the present application, the thickness of the basalt flakes is 3 to 5 microns and the diameter is 0.03 to 5 millimeters; the basalt flakes are obtained by surface treatment with a silane coupling agent.

[0037] Since the surface of basalt flakes is smooth and has no specific active sites, the present application uses silane coupling agents (HK550, HK560, etc.) to treat the surface of basalt flakes, thereby improving the interaction between basalt flakes and the dispersibility of basalt flakes in basalt flake slurry, which is beneficial to enhancing the synergistic effect between basalt flakes and other components such as basalt chopped fibers and basalt powder.

[0038] As an implementation method of an example of the present application, the basalt flake insulation paper further includes, by weight: 0.5 to 2 parts of a dispersant (such as sodium polyacrylate).

[0039] In a second aspect, the present application provides a method for preparing the basalt flake insulation paper according to the first aspect, such as Figure 1 As shown, the preparation method comprises:

[0040] Silane coupling agent is used to perform surface treatment on basalt flakes to obtain surface treated basalt flakes;

[0041] The surface-treated basalt flakes, thickener, basalt chopped fibers, basalt powder and water are mixed to obtain basalt flake slurry;

[0042] The basalt flake slurry is paper-made to obtain basalt flake insulation paper.

[0043] In some specific embodiments, the above preparation method may specifically include:

[0044] In the grinding stage, 1%-3% of silane coupling agent (KH550, KH560, HK570) is added to the surface of basalt flakes for surface treatment. The silane coupling agent is anchored on the surface of basalt flakes through condensation polymerization of silanol produced by hydrolysis of silane coupling agent and silanol on the surface of basalt flakes, thereby improving the interaction force between basalt flakes and the dispersibility in subsequent basalt flake slurry. Subsequently, basalt flakes of different particle sizes are screened out through sieves with different mesh sizes, and basalt flake slurry with a weight fraction of 5%-8% is prepared with deionized water, thickener (guar gum, hydroxypropyl cellulose, carboxymethyl cellulose, polyacrylamide), basalt chopped fibers, and basalt powder. Basalt scale flame-retardant and high-temperature resistant insulating paper is made through a single-cylinder single-net or single-cylinder multi-net papermaking machine, and the basalt scale insulating paper is dried, cut and rolled.

[0045] As an implementation method of an example of the present application, the step of surface treating basalt flakes with a silane coupling agent to obtain surface-treated basalt flakes includes: adding the basalt flakes to an ethanol aqueous solution containing a silane coupling agent (such as silane coupling agent KH550) and ultrasonically treating them for 30-60 minutes.

[0046] In a third aspect, an embodiment of the present application provides an insulating wrapping tape for a cable, wherein the insulating wrapping tape for a cable is made of the basalt flake insulating paper described in any one of the first aspects.

[0047] Since basalt flakes have a similar volume resistivity to mica flakes, a higher heat resistance temperature (softening point 830-860°C, melting point 1450-1500°C), and no small molecules such as crystal water are released during the heating process, the material's high temperature structural stability is better than that of mica paper wrapping tape, and its high temperature electrical stability is better and its heat resistance temperature is higher. Therefore, the insulating wrapping tape for cables provided in the embodiments of the present application has excellent working performance in high temperature environments. At the same time, the insulating wrapping tape for cables is based on the basalt flake insulation paper described in the first aspect above. Since the preparation adopts part or all of the technical solutions of the basalt flake insulation paper described in the first aspect above, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0048] As an implementation of the embodiment of the present application, the insulating wrapping tape for the cable includes the following components in parts by weight:

[0049] The basalt flake insulation paper described in the first aspect is 30-50 parts, the alkali-free glass fiber cloth is 20-40 parts, the polyimide film is 10-25 parts and the resin (such as epoxy resin) is 15-35 parts.

[0050] The cable insulation wrapping tape provided in the embodiment of the present application can be prepared according to the existing method of using mica paper, alkali-free glass fiber cloth, and polyimide film to be compounded by silicone resin or epoxy resin, and the mica paper can be adaptively replaced with the basalt flake insulation paper provided in the embodiment of the present application. This application document will not be repeated here one by one.

[0051] In some specific embodiments, the resin may be silicone resin or epoxy resin.

[0052] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0053] Examples 1-4 provide a basalt flake insulation paper, measured in parts by weight (unit: g), and the specific components and amounts in each example are shown in Table 1.

[0054] Table 1

[0055]

[0056] The preparation methods of the basalt flake insulation paper provided in the above examples include:

[0057] Silane coupling agent is used to perform surface treatment on basalt flakes to obtain surface treated basalt flakes;

[0058] The surface-treated basalt flakes, thickener, basalt chopped fibers, basalt powder and water are mixed to obtain basalt flake slurry;

[0059] The basalt flake slurry is paper-made to obtain basalt flake insulation paper.

[0060] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0061] In addition, in the description of the present application, the terms "include", "comprise", etc. mean "including but not limited to". In this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0062] The embodiments described above are part of the embodiments of the present invention, rather than all of the embodiments. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A basalt flake insulation paper, characterized in that: The basalt flake insulation paper comprises the following components in parts by weight: 5-15 parts of basalt flakes, 1-3 parts of thickener, 10-30 parts of basalt chopped fibers, 5-20 parts of basalt powder and 200-500 parts of water.

2. The basalt flake insulation paper according to claim 1, characterized in that: The basalt flake insulation paper comprises the following components in parts by weight: 10 parts of basalt flakes, 2 parts of thickener, 20 parts of basalt chopped fibers, 15 parts of basalt powder and 400 parts of water.

3. The basalt flake insulation paper according to claim 1 or 2, characterized in that: The thickness of the basalt flakes is 3 to 5 microns, and the diameter is 0.03 to 5 millimeters; the basalt flakes are obtained by surface treatment with a silane coupling agent.

4. The basalt flake insulation paper according to claim 1 or 2, characterized in that: The thickener includes at least one of guar gum, hydroxypropyl cellulose, carboxymethyl cellulose and polyacrylamide.

5. The basalt flake insulation paper according to claim 1 or 2, characterized in that: Calculated in parts by weight, the basalt flake insulation paper further includes: 0.5 to 2 parts of dispersant.

6. A method for preparing basalt flake insulation paper according to any one of claims 1 to 5, characterized in that: The preparation method comprises: Silane coupling agent is used to perform surface treatment on basalt flakes to obtain surface treated basalt flakes; The surface-treated basalt flakes, thickener, basalt chopped fibers, basalt powder and water are mixed to obtain basalt flake slurry; The basalt flake slurry is paper-made to obtain basalt flake insulation paper.

7. The preparation method according to claim 6, characterized in that: The step of surface treating the basalt flakes with a silane coupling agent to obtain the surface treated basalt flakes comprises: adding the basalt flakes to an ethanol aqueous solution containing a silane coupling agent and performing ultrasonic treatment for 30-60 minutes.

8. An insulating wrapping tape for a cable, characterized in that: The insulating wrapping tape for the cable is made of the basalt flake insulating paper described in any one of claims 1 to 5.

9. The insulating wrapping tape for a cable according to claim 8, characterized in that: The insulating wrapping tape for the cable comprises the following components in parts by weight: 30-50 parts of basalt flake insulation paper as described in any one of claims 1 to 5, 20-40 parts of alkali-free glass fiber cloth, 10-25 parts of polyimide film and 15-35 parts of resin.

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