Antistatic flame-retardant composite material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of electrical materials, and discloses an antistatic flame-retardant composite material as well as a preparation method and application thereof. The antistatic flame-retardant composite material comprises the following raw material components: modified epoxy resin, conductive color paste, glass fibers, a curing agent and an accelerant. Wherein the modified epoxy resin is phosphaphenanthrene epoxy resin; the conductive color paste is selected from at least one of conductive carbon black, conductive carbon nanotubes and conductive carbon fibers. The preparation method is simple to operate and easy to industrialize. According to the antistatic flame-retardant composite material, the conductive color paste is added, a conductive network is formed in the base material, dissipation of static charges accumulated in the base material is accelerated, the modified epoxy resin is added, the phosphorus content in the product is increased, and the flame retardance of the composite material is enhanced; the composite material disclosed by the invention has excellent antistatic and flame-retardant effects, the surface resistance is as low as 107 omega, and the flame-retardant property is V-0 grade.

Description

Technical Field

[0001] The invention relates to the technical field of electrical materials, and in particular to an anti-static flame-retardant composite material and a preparation method and application thereof. Background Art

[0002] With the development of the electrical industry, composite materials products that are highly insulating, high-strength, high-temperature resistant, and antistatic and adaptable to various use environments have emerged one after another. At present, epoxy resin composite materials are widely used because of their good electrical insulation, but they are prone to generate static electricity through friction during use, and the accumulation of static electricity can easily lead to short circuits, fires, and even explosions. In composite materials, conductive carbon black is usually added to play an antistatic role. The greater the proportion of conductive carbon black, the more significant its antistatic effect. However, adding too much conductive carbon black will lead to insufficient flame retardancy of the composite material and reduce the mechanical properties of the composite material. In high-power product applications, safety is insufficient. Summary of the invention

[0003] In order to overcome at least one of the problems existing in the above-mentioned prior art, one of the purposes of the present invention is to provide an anti-static flame retardant composite material. The second purpose of the present invention is to provide a method for preparing the anti-static flame retardant composite material. The third purpose of the present invention is to provide an electrical device. The anti-static flame retardant composite material of the present invention forms a conductive network inside the matrix material by adding conductive color paste, accelerates the dissipation of the static charge accumulated in the matrix material, and increases the phosphorus content in the product by adding modified epoxy resin, thereby enhancing the flame retardancy of the composite material, so that the composite material of the present invention has excellent anti-static and flame retardant effects at the same time.

[0004] To this end, the present invention adopts the following technical solutions:

[0005] A first aspect of the present invention provides an anti-static flame retardant composite material, the raw material components of which include modified epoxy resin, conductive color paste, glass fiber, curing agent and accelerator.

[0006] Preferably, the modified epoxy resin is a phosphaphenanthrene epoxy resin. Further preferably, the modified epoxy resin is at least one of a bisphenol A novolac resin containing a phosphaphenanthrene side group and a phosphaphenanthrene / triazinetrione dibasic carboxylic acid flame retardant anhydride cured epoxy resin. Even more preferably, the modified epoxy resin is 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide.

[0007] Preferably, the conductive paste is selected from at least one of conductive carbon black, conductive carbon nanotubes, and conductive carbon fibers. Further preferably, the conductive paste includes conductive carbon black and conductive carbon nanotubes, and the weight ratio of the conductive carbon black to the conductive carbon nanotubes is (0.1-4):(1-6).

[0008] Preferably, the curing agent is selected from at least one of cyanamide polymer and phenolic resin.

[0009] Preferably, the cyanamide polymer is selected from at least one of dicyandiamide, aniline dicyandiamide, and benzaldehyde dicyandiamide. Further preferably, the cyanamide polymer is selected from dicyandiamide.

[0010] Preferably, the phenolic resin is selected from at least one of nitrogen-containing phenolic resin and phosphorus-containing phenolic resin. Further preferably, the phenolic resin is selected from phosphorus-containing phenolic resin.

[0011] Preferably, the accelerator is an imidazole compound. Further preferably, the imidazole compound is at least one selected from 2-methylimidazole, 2-ethyl-4-methylimidazole, and 2-phenylimidazole.

[0012] Preferably, the anti-static flame retardant composite material comprises, by weight, the following raw material components:

[0013] 30-60 parts of modified epoxy resin;

[0014] 3-15 parts of conductive color paste;

[0015] 35-60 parts of glass fiber;

[0016] 0.5-5 parts of curing agent;

[0017] Accelerator 0.01~0.5 parts.

[0018] Further preferably, the anti-static flame retardant composite material comprises, by weight, raw material components:

[0019] 40-55 parts of modified epoxy resin;

[0020] Conductive color paste 5-10 parts;

[0021] 35-55 parts of glass fiber;

[0022] 1 to 3 parts of curing agent;

[0023] Accelerator 0.02-0.1 parts.

[0024] The second aspect of the present invention provides a method for preparing the anti-static flame retardant composite material according to the first aspect of the present invention, comprising the following steps:

[0025] (1) Mixing and dissolving a curing agent and an accelerator, adding a conductive color paste and a modified epoxy resin to prepare glue;

[0026] (2) Immersing the glass fiber in glue and drying it to obtain the anti-static flame-retardant composite material.

[0027] Preferably, in step (1), the time for mixed dissolution is 30 to 90 min. Further preferably, in step (1), the time for mixed dissolution is 30 to 80 min. Even further preferably, in step (1), the time for mixed dissolution is 40 to 60 min.

[0028] The third aspect of the present invention provides an electrical device, comprising the anti-static flame retardant composite material prepared according to the anti-static flame retardant composite material according to the first aspect of the present invention or the method for preparing the anti-static flame retardant composite material according to the second aspect of the present invention.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The antistatic flame-retardant composite material of the present invention forms a conductive network inside the base material by adding a conductive color paste, accelerates the dissipation of the static charge accumulated in the base material, and increases the phosphorus content in the product by adding a modified epoxy resin, thereby enhancing the flame retardancy of the composite material, so that the composite material of the present invention has excellent antistatic and flame retardant effects at the same time, and the surface resistance is as low as 10 7 Ω, flame retardant performance is V-0 grade. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below through specific examples, comparative examples and tables, but is not limited to all discussions and data.

[0032] Among the raw material components of the anti-static flame-retardant composite material, the conductive carbon black is 2209-011 from Jiangxi Xiyan New Material Technology Co., Ltd., the conductive carbon nanotube is 2310-011 from Jiangxi Xiyan New Material Technology Co., Ltd., the glass fiber is 2116 from Zhuhai Zhubo Electronic Materials Co., Ltd. and the bisphenol A epoxy resin is 901 from Zhuhai Hongchang Electronic Materials Co., Ltd.

[0033] It is particularly important to emphasize that, unless otherwise specified, the raw materials, reagents or devices in the present invention can be obtained from conventional commercial channels.

[0034] The contents of the components in the following Examples 1 to 4 and Comparative Examples 1 to 3 are shown in Table 1:

[0035] Table 1 Mass ratio of components of Examples 1 to 4 and Comparative Examples 1 to 3 (unit: g)

[0036]

[0037] Embodiment 1:

[0038] A method for preparing an anti-static flame-retardant composite material comprises the following steps:

[0039] (1) adding a curing agent and an accelerator to a solvent, mixing and dissolving for 60 minutes, adding a conductive color paste and a modified epoxy resin, and dispersing them evenly to obtain a glue;

[0040] (2) The glass fibers are immersed in glue, dried in an oven, taken out for lamination, and sent to a press for lamination to obtain an antistatic flame retardant composite material.

[0041] Embodiment 2:

[0042] The preparation method of an anti-static flame retardant composite material is the same as that of Example 1, except that the mass of each raw material is added according to that of Example 2.

[0043] Embodiment 3:

[0044] The preparation method of an anti-static flame retardant composite material is the same as that of Example 1, except that the mass of each raw material is added according to that of Example 3.

[0045] Embodiment 4:

[0046] The preparation method of an anti-static flame retardant composite material is the same as that of Example 1, except that the mass of each raw material is added according to that of Example 4.

[0047] Comparative Example 1:

[0048] The preparation method of an anti-static flame retardant composite material is the same as that of Example 1, except that no conductive color paste is added in Comparative Example 1, and the mass of each raw material is added according to that in Comparative Example 1.

[0049] Comparative Example 2:

[0050] The preparation method of an antistatic flame retardant composite material is the same as that of Example 1, except that the modified epoxy resin added in Comparative Example 2 is a commonly used industrial epoxy resin: bisphenol A type epoxy resin, and the mass of each raw material added is based on that of Comparative Example 2.

[0051] Comparative Example 3:

[0052] The preparation method of an anti-static flame retardant composite material is the same as that of Example 1, except that in Comparative Example 3, the amount of conductive color paste added is 50% of that added in Example 1, and the mass of each raw material added is based on that of Comparative Example 3.

[0053] Material performance test:

[0054] The surface resistance and flame retardant properties of the anti-static flame retardant composite materials obtained in Examples 1 to 4 and Comparative Examples 1 to 3 were tested according to the following test standards:

[0055] Surface resistance: After taking the board, wipe the surface of the board with a clean dust-free cloth, place the surface resistance tester (DR.SCHAEIDER model: SL-030) on the surface of the board for testing and read the data.

[0056] Flame retardant performance: tested according to UL-94 standard.

[0057] Table 2 Test results of Examples 1 to 4 and Comparative Examples 1 to 3

[0058]

[0059] From the test results in Table 2, it can be seen that the surface resistance of Examples 1 to 4 is 10 7 Ω, accelerating the elimination of static charge accumulated on the surface, showing excellent conductive properties; the flame retardant properties of Examples 1 to 4 are all V-0 level, and the flame retardant effect is outstanding. Comparative Example 1 does not add conductive color paste, although the flame retardant effect is good, but the surface resistance is as high as 10 10 Ω, high resistance, poor conductivity. Comparative Example 2 adds other types of modified epoxy resin, good conductivity, but insufficient flame retardant performance. In Comparative Example 3, insufficient amount of conductive color paste is added, the conductive network is not fully spread, and the conductive performance is poor.

Claims

1. An anti-static flame retardant composite material, characterized in that: The raw material components include modified epoxy resin, conductive color paste, glass fiber, curing agent and accelerator; The modified epoxy resin is a phosphaphenanthrene epoxy resin.

2. The anti-static flame retardant composite material according to claim 1, characterized in that: The modified epoxy resin is at least one of a bisphenol A novolac resin containing a phosphaphenanthrene side group and a phosphaphenanthrene / triazinetrione dicarboxylic acid flame retardant anhydride cured epoxy resin; And / or, the conductive color paste is selected from at least one of conductive carbon black, conductive carbon nanotubes, and conductive carbon fibers.

3. The anti-static flame retardant composite material according to claim 2, characterized in that: The conductive color paste includes conductive carbon black and conductive carbon nanotubes, and the weight ratio of the conductive carbon black to the conductive carbon nanotubes is (0.1-4):(1-6).

4. The anti-static flame retardant composite material according to claim 1, characterized in that: The curing agent is selected from at least one of cyanamide polymer and phenolic resin.

5. The anti-static flame retardant composite material according to claim 4, characterized in that: The cyanamide polymer is selected from at least one of dicyandiamide, aniline dicyandiamide, and benzaldehyde dicyandiamide; And / or, the phenolic resin is selected from at least one of nitrogen-containing phenolic resin and phosphorus-containing phenolic resin.

6. The anti-static flame retardant composite material according to claim 1, characterized in that: The accelerator is an imidazole compound.

7. The anti-static flame retardant composite material according to claim 6, characterized in that: The imidazole compound is selected from at least one of 2-methylimidazole, 2-ethyl-4-methylimidazole and 2-phenylimidazole.

8. The anti-static flame retardant composite material according to any one of claims 1 to 7, characterized in that: By weight, the raw material components include: 30-60 parts of modified epoxy resin; 3-15 parts of conductive color paste; 35-60 parts of glass fiber; 0.5-5 parts of curing agent; Accelerator 0.01~0.5 parts.

9. A method for preparing the anti-static flame retardant composite material according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) Mixing and dissolving a curing agent and an accelerator, adding a conductive color paste and a modified epoxy resin to prepare glue; (2) Immersing the glass fiber in glue and drying it to obtain the anti-static flame-retardant composite material.

10. An electrical device, characterized in that: The invention comprises the anti-static flame retardant composite material according to any one of claims 1 to 8 or the anti-static flame retardant composite material prepared by the preparation method of the anti-static flame retardant composite material according to claim 9.

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