Mica-based flame retardant, application thereof and vinyl cable material containing mica-based flame retardant

Abstract

The invention belongs to the technical field of halogen-free inorganic flame retardants, and particularly discloses a mica-based flame retardant, application thereof and a vinyl cable material containing the mica-based flame retardant, the mica-based flame retardant is prepared by directly compounding and mixing mica powder and strong alkali, and the mica-based flame retardant can be widely applied to flame retardance of materials such as rubber, plastic and paint. The vinyl cable material containing the mica-based flame retardant has good flame retardance and physical and mechanical properties at the same time. The mica-based flame retardant disclosed by the invention is wide in raw material source, simple in preparation process, low in production cost, low in addition amount when being used as a flame retardant, small in influence on physical and mechanical properties of a matrix, and wide in market prospect and remarkable in social and economic benefits.

Description

Technical Field

[0001] The invention relates to a flame retardant material, in particular to a mica-based flame retardant and application thereof, and a vinyl cable material containing the mica-based flame retardant, belonging to the technical field of inorganic flame retardants. Background Art

[0002] Although halogen flame retardants have excellent flame retardant properties, their fatal shortcomings, such as toxicity and environmental concerns, limit their widespread application. Halogen-free flame retardants have emerged as a result, mainly inorganic flame retardants based on magnesium hydroxide and aluminum hydroxide, and the excellent intumescent flame retardants.

[0003] Intumescent flame retardants (IFRs) have rapidly developed due to their excellent performance and are widely used in rubber, plastics, and coatings. IFRs consist of three components: a carbon source, an acid source, and a gas source. Carbon sources primarily include pentaerythritol and starch; acid sources primarily include potassium ammonium dihydrogen phosphate and ammonium polyphosphate; and gas sources primarily include melamine and urea. Their mechanism of action is that during combustion, they form a dense, high-temperature-resistant char layer that isolates the flammable material from the fire source and oxygen. Simultaneously, the generated gas dilutes the flammable gas and oxygen, thereby achieving a flame retardant effect. The advantages of intumescent flame retardants are that they form a barrier layer, resulting in a strong flame retardant effect and minimal impact on the physical and mechanical properties of the substrate. However, due to their complex composition, intumescent flame retardants require complex processing and are relatively expensive. Inorganic flame retardants, such as aluminum hydroxide and magnesium hydroxide, while inexpensive, offer poor flame retardancy and require high addition levels, significantly impacting the physical and mechanical properties of the substrate (rubber, plastic, and coating). Summary of the Invention

[0004] To address the problems of existing flame-retardant materials, such as complex production processes, high costs, and significant impact on substrate properties, the present invention provides a mica-based flame retardant. This mica-based flame retardant is produced by directly compounding mica powder with a strong base. The raw materials are readily available, the preparation process is simple, and the production cost is low. When applied to rubber, plastics, and coatings, this mica-based flame retardant exhibits excellent flame retardancy with minimal impact on the physical and mechanical properties of these materials, even at low addition levels. In particular, when used as a material for ethylene-vinyl acetate cables, this mica-based flame retardant exhibits excellent flame retardancy with minimal impact on physical and mechanical properties.

[0005] In order to achieve the above technical objectives, the technical solutions adopted by the present invention are as follows:

[0006] According to a first embodiment of the present invention, a mica-based flame retardant is provided:

[0007] A mica-based flame retardant comprises mica powder and a strong base or is composed of a mixture of mica powder and a strong base.

[0008] Preferably, the mixing mass ratio of the mica powder and the strong alkali is 1:1~3.

[0009] Preferably, the mixing mass ratio of the mica powder to the strong alkali is 1:1.2~2.5.

[0010] Preferably, the mixing mass ratio of the mica powder to the strong alkali is 1:1.4~2.1.

[0011] Preferably, the mica powder is natural mica powder and / or synthetic mica powder, preferably synthetic mica powder (KMg3(AlSi3O 10 )F2).

[0012] Preferably, the strong base is one or more of sodium hydroxide, potassium hydroxide, and lithium hydroxide, preferably potassium hydroxide.

[0013] According to a second embodiment of the present invention, there is provided a use of a mica-based flame retardant:

[0014] A use of a mica-based flame retardant, wherein the mica-based flame retardant or the mica-based flame retardant as described in the first embodiment is used as a flame retardant additive for any one of rubber, plastic, and coating.

[0015] In the prior art, mica powder used in pearlescent pigment production is primarily of relatively large diameter and thickness. However, during the mica powder production process, in addition to the relatively large diameter and thickness of the mica powder, a large amount of ultrafine mica powder (≤15 microns) is also produced. Ultrafine mica powder cannot be used in pearlescent pigment production. In the present invention, the mica used in the production of mica-based flame retardants is primarily ultrafine mica powder with a smaller particle size and a large specific surface area. This means that the present invention utilizes waste ultrafine mica powder, which is not needed in the pearlescent pigment production process, as a raw material for the production of mica-based flame retardants. This achieves high-value recycling of ultrafine mica powder while significantly reducing the production cost of the mica-based flame retardants. This eliminates the need for additional mica powder grinding, reduces process steps, and improves production efficiency.

[0016] In the present invention, research has discovered that by mixing mica powder with a strong base in a specific ratio, an inorganic mica-based flame retardant can be produced for use in substrates such as rubber, plastic, and coatings. This flame retardant reacts at temperatures in the initial stages of a fire (approximately 250-300°C) to form a barrier layer, shielding flammable materials from heat and oxygen. The water vapor generated by the reaction also dilutes the flammable gases and oxygen. This mica-based flame retardant exhibits flame retardancy similar to that of intumescent flame retardants, offering excellent flame retardancy with minimal addition. In a preferred embodiment of the present invention, a mica-based flame retardant produced by mixing mica powder and a strong base in a mass ratio of 1:1-3 (preferably 1:1.2-2.5, and more preferably 1:1.4-2.1) exhibits excellent flame retardancy. Excessive or insufficient amounts of the strong base will result in reduced flame retardancy in the resulting combustion aid.

[0017] According to a third embodiment of the present invention, a vinyl cable material is provided:

[0018] A vinyl cable material, comprising or consisting of the following raw materials:

[0019] EVA-40 (ethylene-vinyl acetate copolymer): 20-50 parts by mass.

[0020] VA-1828 (ethylene-vinyl acetate copolymer): 50-80 parts by mass.

[0021] Titanium dioxide (R818): 1-5 parts by mass.

[0022] Antiaging agent (4010NA): 1~5 parts by mass.

[0023] Zinc stearate: 1 to 5 parts by mass.

[0024] Vinyltri(β-methoxyethoxy)silane (A-172): 1 to 5 parts by mass.

[0025] Dioctyl phthalate (DOP): 1-5 parts by mass.

[0026] Triallyl isocyanurate (TAIC): 0.5-5 parts by mass.

[0027] Dicumyl peroxide (DCP): 1-5 parts by mass.

[0028] Mica-based flame retardant as described in the first embodiment: 20-40 parts by mass.

[0029] Preferably, the vinyl cable material comprises or consists of the following raw materials:

[0030] EVA-40: 25 to 40 parts by mass

[0031] VA-1828: 60 to 75 parts by mass.

[0032] Titanium dioxide (R818): 1.5~3 parts by mass.

[0033] Antioxidant (4010NA): 2~4 parts by mass.

[0034] Zinc stearate: 2-4 parts by mass.

[0035] Vinyltri(β-methoxyethoxy)silane (A-172): 2 to 4 parts by mass

[0036] Dioctyl phthalate (DOP): 2-4 parts by mass.

[0037] Triallyl isocyanurate (TAIC): 1 to 4 parts by mass.

[0038] Dicumyl peroxide (DCP): 2-4 parts by mass.

[0039] Mica-based flame retardant as described in the first embodiment: 25-35 parts by mass.

[0040] Preferably, the vinyl cable material is prepared as follows: EVA-40, VA-1828, titanium dioxide (R818), antioxidant 4010NA, zinc stearate, vinyl tris(β-methoxyethoxy)silane (A-172), dioctyl phthalate (DOP), and a mica-based flame retardant are mixed in proportion and pre-mixed to obtain a pre-refined material. Triallyl isocyanurate (TAIC) and dicumyl peroxide (DCP) are then added to the pre-refined material in proportion and re-mixed to obtain a finished material.

[0041] Preferably, the pre-mixing temperature is 20-40° C., and the pre-mixing time is 1-30 min.

[0042] Preferably, the re-mixing temperature is 50-100° C., and the re-mixing time is 1-15 minutes.

[0043] In existing technologies, intumescent flame retardants are expensive due to their complex processing and complex composition. While inorganic flame retardants such as aluminum hydroxide and magnesium hydroxide are inexpensive, they offer poor flame retardancy and require high addition levels, significantly impacting the physical and mechanical properties of the substrate. Research has shown that by mixing mica powder with a strong base as an inorganic flame retardant for vinyl cable materials, a relatively low addition level can ensure excellent flame retardancy while significantly minimizing the impact on the material's physical and mechanical properties, achieving a balance between high flame retardancy and minimal impact on physical and mechanical properties.

[0044] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0045] 1: The mica-based flame retardant prepared by the present invention using mica powder and strong alkali as raw materials has good flame retardant properties and has low impact on the physical and mechanical properties of the substrate. It can be widely used in rubber, plastic, coating, etc., and has broad market prospects and significant social and economic benefits.

[0046] 2. The mica-based flame retardant of the present invention has a wide range of raw material sources, a simple preparation process, low production costs, and a low addition dosage, offering excellent prospects for large-scale promotion and application. Furthermore, vinyl cable materials containing it exhibit both excellent flame retardancy and physical and mechanical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a photo of the sample after the combustion test of Sample IV.

[0048] Figure 2 This is a photo of the sample after the combustion test of the control sample. DETAILED DESCRIPTION

[0049] The technical solutions of the present invention are illustrated below with examples, and the scope of protection requested by the present invention includes but is not limited to the following embodiments.

[0050] Preparation Example 1

[0051] 100 g of synthetic mica powder and 70 g of KOH were weighed, added into a grinder, crushed and stirred evenly to obtain a mica-based flame retardant (denoted as S1).

[0052] Preparation Example 2

[0053] Weigh 100 g of synthetic mica powder and 100 g of KOH, add the two into a grinder, grind and stir evenly to obtain a mica-based flame retardant (denoted as S2).

[0054] Preparation Example 3

[0055] 100 g of synthetic mica powder and 120 g of KOH were weighed, added to a grinder, crushed and stirred evenly to obtain a mica-based flame retardant (denoted as S3).

[0056] Preparation Example 4

[0057] 100 g of synthetic mica powder and 140 g of KOH were weighed, added into a grinder, crushed and stirred uniformly to obtain a mica-based flame retardant (denoted as S4).

[0058] Preparation Example 5

[0059] 100 g of synthetic mica powder and 170 g of KOH were weighed, added to a grinder, crushed and stirred evenly to obtain a mica-based flame retardant (denoted as S5).

[0060] Preparation Example 6

[0061] 100 g of synthetic mica powder and 210 g of KOH were weighed, added to a grinder, crushed and stirred uniformly to obtain a mica-based flame retardant (denoted as S6).

[0062] Preparation Example 7

[0063] 100 g of synthetic mica powder and 250 g of KOH were weighed, added to a grinder, crushed and stirred uniformly to obtain a mica-based flame retardant (denoted as S7).

[0064] Preparation Example 8

[0065] 100 g of synthetic mica powder and 300 g of KOH were weighed, added to a grinder, crushed and stirred evenly to obtain a mica-based flame retardant (denoted as S8).

[0066] Preparation Example 9

[0067] 100 g of synthetic mica powder and 330 g of KOH were weighed, added to a grinder, crushed and stirred uniformly to obtain a mica-based flame retardant (denoted as S9).

[0068] Preparation Example 10

[0069] 100 g of synthetic mica powder and 160 g of NaOH were weighed, added to a grinder, crushed and stirred uniformly to obtain a mica-based flame retardant (denoted as S10).

[0070] Application Example 1

[0071] First, 25g of S1, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tris(β-methoxyethoxy)silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of diisopropyl peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as E1).

[0072] Application Example 2

[0073] First, 25g of S2, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tri(β-methoxyethoxy) silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of diisopropyl peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as E2).

[0074] Application Example 3

[0075] First, 25g of S3, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tri(β-methoxyethoxy) silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of diisopropyl peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as E3).

[0076] Application Example 4

[0077] First, 25g of S4, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tris(β-methoxyethoxy)silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of diisopropyl peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as E4).

[0078] Application Example 5

[0079] First, 25g of S5, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tris(β-methoxyethoxy)silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of diisopropyl peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as E5).

[0080] Application Example 6

[0081] First, 25g of S6, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tri(β-methoxyethoxy) silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of diisopropyl peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as E6).

[0082] Application Example 7

[0083] First, 25g of S7, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tris(β-methoxyethoxy)silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of diisopropyl peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as E7).

[0084] Application Example 8

[0085] First, 25g of S8, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tri(β-methoxyethoxy) silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of diisopropyl peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as E8).

[0086] Application Example 9

[0087] First, 25g of S9, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tri(β-methoxyethoxy) silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of diisopropyl peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as E9).

[0088] Application Example 10

[0089] First, 25g of S10, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tri(β-methoxyethoxy) silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of diisopropyl peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as E10).

[0090] Application Example 11

[0091] First, 15g of S5, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tri(β-methoxyethoxy) silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of diisopropyl peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as E11).

[0092] Application Example 12

[0093] First, 20g of S5, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tri(β-methoxyethoxy) silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of diisopropyl peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as E12).

[0094] Application Example 13

[0095] First, 30g of S5, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tri(β-methoxyethoxy) silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of diisopropyl peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as E13).

[0096] Application Example 14

[0097] First, 35g of S5, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tri(β-methoxyethoxy) silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of diisopropyl peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as E14).

[0098] Application Example 15

[0099] First, 40g of S5, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tri(β-methoxyethoxy) silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of diisopropyl peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as E15).

[0100] Application Example 16

[0101] First, 45g of S5, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tri(β-methoxyethoxy) silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of diisopropyl peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as E16).

[0102] Comparative Example 1

[0103] First, 25g of aluminum hydroxide, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tris(β-methoxyethoxy)silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of diisopropylbenzene peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as D1).

[0104] Comparative Example 2

[0105] First, 30g of aluminum hydroxide, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tris(β-methoxyethoxy)silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of dicumyl peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as D2).

[0106] Comparative Example 3

[0107] First, 35g of aluminum hydroxide, 30g of EVA-40, 70g of VA-1828, 2g of titanium dioxide, 3g of dioctyl phthalate, 2.5g of antioxidant 4010NA, 2g of zinc stearate, and 2g of vinyl tris(β-methoxyethoxy)silane were added to a mixer and mixed at room temperature for 10 minutes; then 1g of triallyl isocyanurate and 2.6g of dicumyl peroxide were added to the mixer and mixed at 70°C for 3 minutes to obtain a vinyl cable material (denoted as D3).

[0108] Flame retardant performance test:

[0109] First, 42g of P004 polyester powder coating and 18g of the S1 flame retardant prepared above were mixed evenly, and sprayed on an oil-free and rust-free cold-rolled steel plate using a powder coating sprayer to a spray thickness of 80μm. The plate was placed in an oven at 200℃ and baked for 15min, and then naturally cooled to obtain sample I.

[0110] The above process was repeated with the prepared S2 to S10 and the P004 polyester powder coating to obtain samples II to X, respectively.

[0111] 60 g of P004 polyester powder coating was sprayed on an oil-free and rust-free cold-rolled steel plate using a powder coating sprayer to a thickness of 80 μm. The plate was baked in an oven at 200° C. for 15 minutes and then naturally cooled to obtain a control sample.

[0112] A horizontal combustion test was conducted on Samples I to X and the control sample using a gas spray gun. The test sample was placed horizontally, the inner flame height of the gas spray gun flame was 20 mm, the edge of the sample was 10 mm from the gas spray gun nozzle, and the combustion test lasted for 30 seconds.

[0113] Finally, after comparison, it was found that samples I to X all had significant flame retardant effects compared to the control sample. The burned areas of samples IV, V, and VI were significantly smaller than those of the other samples, with sample V having the smallest burned area.

[0114] Cable material performance test:

[0115] The cable materials (E1-E16, D1-D3) obtained in Examples 1-16 and Comparative Examples 1-3 were respectively sampled to obtain plastic samples of the materials, and then the limiting oxygen index LOI, vertical burning test, and tensile test of each plastic sample were tested.

[0116] Sample preparation steps are as follows: 1) Pressing: Use a flatbed vulcanizer at 180°C. Use a 2mm thick mold for tensile specimens and a 4mm thick mold for vertical combustion and LOI tests. Curing is done for 15 minutes. 2) Tensile: Select a 2mm specimen and cut it with a dumbbell cutter to ensure the test area is 4mm wide. 3) Vertical combustion: Select a 4mm specimen and cut it with a straight cutter to ensure a width of 13mm and a length greater than 150mm. 4) Limiting Oxygen Index: Select a 4mm specimen and cut it with a straight cutter to ensure a width of 10mm and a length greater than 125mm.

[0117] Table 1 shows the performance test results of various cable materials

[0118]

[0119] The sources of the reagents used in the present invention are as follows:

[0120] Synthetic mica powder is an ultrafine synthetic fluorphlogopite powder with a particle size of less than 15 microns.

[0121] Potassium hydroxide (industrial grade) was purchased from Langfang Qianyao Technology Co., Ltd.

[0122] Sodium hydroxide (industrial grade) was purchased from Shandong Senbang Chemical Co., Ltd.

[0123] Aluminum hydroxide (industrial grade) was purchased from Jinan Jiuding New Materials Industry Co., Ltd.

[0124] EVA-40 was purchased from Mitsui Chemicals, Inc., Japan.

[0125] VA-1828 was purchased from Mitsui Chemicals, Inc., Japan.

[0126] Titanium dioxide (R818) was purchased from Shanghai Liangjiang Titanium Dioxide Chemical Products Co., Ltd.

[0127] Antioxidant 4010NA was purchased from Jiangsu Shengao Chemical Technology Co., Ltd.

[0128] Zinc stearate (industrial grade) was purchased from Qingdao Sino New Materials Co., Ltd.

[0129] Vinyl tris(β-methoxyethoxy)silane (A-172) was purchased from Nanjing Daoning Chemical Co., Ltd.

[0130] Dioctyl phthalate (DOP) was purchased from Shandong Shengfan Chemical Co., Ltd.

[0131] Triallyl isocyanurate (TAIC) was purchased from Zhonghe Chemical (Shandong) Co., Ltd.

[0132] Dicumyl peroxide (DCP) was purchased from Wanqing Chemical Technology Co., Ltd.

[0133] P004 polyester powder coating was purchased from Tianjin Xiangsheng Weiye Powder Coating Co., Ltd.

[0134] Vertical burning test standard: GB / T 2408-2008.

[0135] Oxygen index test standard: GB / T 2406.1-2008.

[0136] Tensile test standard: GB / T 528-2009.

Claims

1. A mica-based flame retardant, characterized in that: The mica-based flame retardant comprises mica powder and a strong base or is a mixture of mica powder and a strong base.

2. The mica-based flame retardant according to claim 1, characterized in that: The mixing mass ratio of the mica powder and the strong alkali is 1:1-3.

3. The mica-based flame retardant according to claim 1 or 2, characterized in that: The mixing mass ratio of the mica powder to the strong alkali is 1:1.2~2.

5.

4. The mica-based flame retardant according to any one of claims 1 to 3, characterized in that: The mixing mass ratio of the mica powder to the strong alkali is 1:1.4~2.

1.

5. The mica-based flame retardant according to any one of claims 1 to 4, characterized in that: The mica powder is natural mica powder and / or synthetic mica powder, preferably synthetic mica powder; and / or The strong base is one or more of sodium hydroxide, potassium hydroxide, and lithium hydroxide, preferably potassium hydroxide.

6. A use of a mica-based flame retardant, characterized in that: The mica-based flame retardant according to any one of claims 1 to 5 is used as a flame retardant additive for any material selected from rubber, plastic, and coating.

7. A vinyl cable material, characterized by: The vinyl cable material includes or consists of the following raw materials: EVA-40: 20-50 parts by mass; VA-1828: 50-80 parts by mass; Titanium dioxide: 1-5 parts by mass; Antiaging agent: 1-5 parts by mass; Zinc stearate: 1-5 parts by mass; Vinyl tris(β-methoxyethoxy)silane: 1-5 parts by mass; Dioctyl phthalate: 1-5 parts by mass; Triallyl isocyanurate: 0.5-5 parts by mass; Dicumyl peroxide: 1-5 parts by mass; 20-40 parts by mass of the mica-based flame retardant according to any one of claims 1 to 5.

8. The vinyl cable material according to claim 7, characterized in that: EVA-40: 25-40 parts by mass; VA-1828: 60-75 parts by mass; Titanium dioxide: 1.5-3 parts by mass; Antiaging agent: 2~4 parts by mass; Zinc stearate: 2-4 parts by mass; Vinyl tris(β-methoxyethoxy)silane: 2-4 parts by mass; Dioctyl phthalate: 2-4 parts by mass; Triallyl isocyanurate: 1-4 parts by mass; Dicumyl peroxide: 2-4 parts by mass; 25-35 parts by mass of the mica-based flame retardant according to any one of claims 1 to 5.

9. The vinyl cable material according to claim 7 or 8, characterized in that: The preparation process of the vinyl cable material is as follows: first, EVA-40, VA-1828, titanium dioxide, antioxidant, zinc stearate, vinyl tris(β-methoxyethoxy)silane, dioctyl phthalate, and mica-based flame retardant are mixed in proportion and then pre-mixed to obtain a pre-refined material; then, triallyl isocyanurate and dicumyl peroxide are added to the pre-refined material in proportion and then re-mixed to obtain a finished material.

10. The vinyl cable material according to claim 9, characterized in that: The pre-mixing temperature is 20-40°C and the pre-mixing time is 1-30 minutes; and / or The re-mixing temperature is 50-100°C, and the re-mixing time is 1-15 minutes.

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