Calcium-magnesium composite fireproof flame-retardant material, preparation method and application thereof, flame-retardant optical / cable and preparation method thereof

Abstract

The invention provides a calcium-magnesium composite fireproof flame-retardant material, a preparation method and application thereof, a flame-retardant optical / cable and a preparation method thereof, and relates to the technical field of flame-retardant materials. According to the invention, only water is used as a solvent, the VAE latex is used as a polymer matrix, the biomass calcium material powder and the magnesium hydroxide are used as fillers, the raw materials are low in price and easy to obtain, and the calcium-magnesium composite fireproof flame-retardant material has excellent flame retardance and mechanical strength. According to the invention, the layered structure, gas generation mechanism, stable thermal decomposition product and excellent mechanical property of the biomass calcium material are utilized, so that the flame retardant property and mechanical property of the calcium-magnesium composite fireproof flame-retardant material can be effectively improved. Through the synergistic effect of the magnesium hydroxide and the biomass calcium material, the flame retardant property, tensile strength and stretch rate of the calcium-magnesium composite fireproof flame-retardant material are enhanced. Moreover, the biomass calcium is solid waste, the raw materials are easy to obtain and low in price, and the calcium-magnesium composite fireproof flame-retardant material is low in cost.

Description

[0001] This application claims the priority of a Chinese patent application titled "A Calcium-Magnesium Composite Fireproof and Flame-Retardant Material and Its Preparation Method and Application, Flame-Retardant Optical / Cable and Its Preparation Method" with the application number CN2024116014370 and filed with the National Intellectual Property Administration on November 11, 2024. The entire content thereof is incorporated herein by reference. Technical Field

[0002] The present invention relates to the technical field of flame-retardant materials, and specifically relates to a calcium-magnesium composite fireproof and flame-retardant material and its preparation method and application, and a flame-retardant optical / cable and its preparation method. Background Art

[0003] The application scenarios of optical (electrical) cables have put forward higher requirements for safety, flame retardancy, and mechanical properties. At present, flame-retardant and fire-resistant communication optical (electrical) cables are composed of conductors, insulating layers, fireproof and flame-retardant tapes, etc. The relatively mature flame-retardant tapes on the market mainly use magnesium hydroxide as the raw material. Due to the low flame-retardant efficiency of magnesium hydroxide, the flame-retardant effect can only be achieved when the filling amount reaches more than 60%, which affects the mechanical properties and processing properties of the tape and the cable. Chinese Patent CN118562200A points out that the compatibility between magnesium hydroxide and polymers is poor, and the addition amount is limited, making it difficult to ensure the mechanical properties of the composite material. Chinese Patent CN114318910A discloses the processing process steps of a halogen-free and low-smoke filling rope for cables. The preparation raw materials include the following components in mass percentages: 30-60% of magnesium hydroxide, 10-40% of VAE emulsion, and the rest is water. However, although the above raw materials use magnesium hydroxide for coating, the mechanical properties and processing properties of the tape have not been significantly improved. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a calcium-magnesium composite fireproof and flame-retardant material and its preparation method and application, and a flame-retardant optical / cable and its preparation method. The calcium-magnesium composite fireproof and flame-retardant material provided by the present invention has both excellent flame retardancy and mechanical strength, and low cost.

[0005] In order to achieve the above-mentioned invention purpose, the present invention provides the following technical solutions:

[0006] The present invention provides a calcium-magnesium composite fireproof and flame-retardant material. Calculated by mass parts, the preparation raw materials include: 1-10 parts of biomass calcium material, 1-10 parts of magnesium hydroxide, 2-8 parts of VAE latex, and 10-30 parts of water.

[0007] Preferably, the biomass calcium material includes one or more of shells, oyster shells, and eggshells;

[0008] The biomass calcium material is first pulverized and then dried before use to obtain biomass calcium material powder;

[0009] The particle size of the biomass calcium material powder is 40 - 200 μm.

[0010] The present invention provides a method for preparing the calcium-magnesium composite fireproof and flame-retardant material described in the above technical solution, comprising the following steps:

[0011] Mix the preparation raw materials to obtain a mixed solution, and dry the mixed solution to obtain the calcium-magnesium composite fireproof and flame-retardant material.

[0012] Preferably, the mixing includes ultrasonic mixing or stirring mixing;

[0013] Preferably, the time for ultrasonic mixing is 20 - 40 min, and the power is 20 - 100 W;

[0014] The time for stirring mixing is 30 - 90 min, and the speed is 200 - 800 r / min.

[0015] Preferably, the drying temperature is 60 - 100 °C.

[0016] The present invention provides the application of the calcium-magnesium composite fireproof and flame-retardant material described in the above technical solution or the calcium-magnesium composite fireproof and flame-retardant material prepared by the above technical solution in an optical cable tape or a cable tape.

[0017] The present invention provides a flame-retardant optical / cable, comprising a matrix and a calcium-magnesium composite fireproof and flame-retardant material coated on the surface of the matrix; the matrix includes an optical cable or a cable.

[0018] The present invention provides a method for preparing the flame-retardant optical / cable described in the above technical solution, comprising the following steps: Mix the preparation raw materials of the calcium-magnesium composite fireproof and flame-retardant material described in the above technical solution to obtain a mixed solution, coat the mixed solution on the matrix and then dry it to obtain the flame-retardant optical / cable.

[0019] Preferably, the mixing includes ultrasonic mixing or stirring mixing;

[0020] The time for ultrasonic mixing is 20 - 40 min, and the power is 20 - 100 W;

[0021] The time for stirring mixing is 30 - 90 min, and the speed is 200 - 800 r / min.

[0022] Preferably, the drying temperature is 60 - 100 °C.

[0023] The present invention provides a calcium-magnesium composite fireproof and flame-retardant material. In terms of parts by mass, the preparation raw materials include: 1-10 parts of biomass calcium material, 1-10 parts of magnesium hydroxide, 2-8 parts of VAE latex, and 10-30 parts of water. The present invention only uses water as a solvent, VAE latex as a polymer matrix, and biomass calcium material and magnesium hydroxide as fillers. The raw materials are low-cost and easily available. The calcium-magnesium composite fireproof and flame-retardant material has both excellent flame retardancy and mechanical strength. Specifically, by adding VAE latex as a polymer matrix, the present invention effectively combines the calcium-magnesium composite fireproof and flame-retardant material with glass fiber. The present invention enhances the flame retardancy, tensile strength, and elongation rate of the calcium-magnesium composite fireproof and flame-retardant material through the synergistic effect of magnesium hydroxide and biomass calcium material. Generally, biomass calcium is a unique layered structure constructed by calcium carbonate and organic molecules; at high temperatures, calcium carbonate can decompose into calcium oxide and carbon dioxide, releasing carbon dioxide gas and generating calcium oxide. The carbon dioxide dilutes the combustion-supporting gas, thereby slowing down the combustion rate, and calcium oxide acts as a protective layer to isolate the transfer of heat and gas; the unique layered structure of the biomass calcium material can endow the material with good strength and toughness. The present invention utilizes the layered structure, gas generation mechanism, stable thermal decomposition products, and excellent mechanical properties of the biomass calcium material to effectively improve the flame retardancy and mechanical properties of the calcium-magnesium composite fireproof and flame-retardant material. Moreover, biomass calcium is a solid waste, the raw materials are easily obtained and low in price, and the cost of the calcium-magnesium composite fireproof and flame-retardant material is low.

[0024] The preparation method of the calcium-magnesium composite fireproof and flame-retardant material provided by the present invention has a simple process flow, the raw materials are easily obtained and low in price, is environmentally friendly, has low production cost, and is suitable for industrial production. Specific embodiments

[0025] The present invention provides a calcium-magnesium composite fireproof and flame-retardant material. In terms of parts by mass, the preparation raw materials include: 1-10 parts of biomass calcium material, 1-10 parts of magnesium hydroxide, 2-8 parts of VAE latex, and 10-30 parts of water.

[0026] Unless otherwise specified, the materials and equipment used in the present invention are all commercially available products in the art.

[0027] In terms of parts by mass, the preparation raw materials of the calcium-magnesium composite fireproof and flame-retardant material provided by the present invention include 1-10 parts of biomass calcium material, which can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts in the specific embodiments of the present invention.

[0028] In the present invention, the biomass calcium material preferably comprises one or more of shells, oyster shells and eggshells. In the present invention, the biomass calcium material is first crushed and then dried before use to obtain a biomass calcium material powder. In the present invention, the particle size of the biomass calcium material is preferably 40-200 μm, and in the specific embodiments of the present invention, it can be 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm or 200 μm.

[0029] The biomass calcium material adopted in the present invention has a unique layered structure constructed by calcium carbonate and organic molecules. At high temperatures, calcium carbonate can decompose into calcium oxide and carbon dioxide, releasing carbon dioxide gas and generating calcium oxide. The carbon dioxide dilutes the combustion-supporting gas, thereby slowing down the combustion rate, and the calcium oxide acts as a protective layer to isolate the transfer of heat and gas. Moreover, the unique layered structure of the biomass calcium material can endow the calcium-magnesium composite fireproof and flame-retardant material with good strength and toughness.

[0030] In the present invention, the crushing preferably comprises ball milling, and the time of the ball milling is preferably 5-16 h, and in the specific embodiments of the present invention, it can be 5 h, 6 h, 7 h, 8 h, 9 h, 10 h, 11 h, 12 h, 13 h, 14 h, 15 h or 16 h; the rotation speed of the ball milling is preferably 200-700 r / min, and in the specific embodiments of the present invention, it can be 200 r / min, 250 r / min, 300 r / min, 350 r / min, 400 r / min, 450 r / min, 500 r / min, 550 r / min, 600 r / min, 650 r / min or 700 r / min.

[0031] In the present invention, the drying preferably includes one or more of room temperature drying, atmospheric pressure heating drying, vacuum heating drying, and freeze drying. In the present invention, the temperature of the room temperature drying is preferably room temperature, and the time is preferably 10 to 24 h. In specific embodiments of the present invention, it can be 10 h, 11 h, 12 h, 13 h, 14 h, 15 h, 16 h, 17 h, 18 h, 19 h, 20 h, 21 h, 22 h, 23 h, or 24 h. In the present invention, the temperature of the atmospheric pressure heating drying is preferably 50 to 80 °C, and in specific embodiments of the present invention, it can be 50 °C, 55 °C, 60 °C, 65 °C, 70 °C, 75 °C, or 80 °C; the time of the atmospheric pressure heating drying is preferably 5 to 12 h, and in specific embodiments of the present invention, it can be 5 h, 6 h, 7 h, 8 h, 9 h, 10 h, 11 h, or 12 h. In the present invention, the temperature of the vacuum heating drying is preferably 50 to 80 °C, and in specific embodiments of the present invention, it can be 50 °C, 55 °C, 60 °C, 65 °C, 70 °C, 75 °C, or 80 °C; the time of the vacuum heating drying is preferably 5 to 12 h, and in specific embodiments of the present invention, it can be 5 h, 6 h, 7 h, 8 h, 9 h, 10 h, 11 h, or 12 h. In the present invention, the temperature of the freeze drying is preferably -50 to -80 °C, and in specific embodiments of the present invention, it can be -50 °C, -60 °C, -70 °C, or -80 °C; the time of the freeze drying is preferably 10 to 24 h, and in specific embodiments of the present invention, it can be 10 h, 11 h, 12 h, 13 h, 14 h, 15 h, 16 h, 17 h, 18 h, 19 h, 20 h, 21 h, 22 h, 23 h, or 24 h.

[0032] Based on the mass parts of the biomass calcium material powder, the raw materials for preparing the calcium-magnesium composite fireproof and flame-retardant material provided by the present invention include 1 to 10 parts of magnesium hydroxide, and in specific embodiments of the present invention, it can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts. The present invention enhances the flame retardancy, tensile strength, and elongation at break of the calcium-magnesium composite fireproof and flame-retardant material through the synergistic effect of magnesium hydroxide and the biomass calcium material.

[0033] Based on the mass parts of the biomass calcium material powder, the raw materials for preparing the calcium-magnesium composite fireproof and flame-retardant material provided by the present invention include 2 to 8 parts of VAE latex, and in specific embodiments of the present invention, it can be 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, or 8 parts. The present invention effectively combines the calcium-magnesium composite fireproof and flame-retardant material with glass fiber by adding VAE latex as a polymer matrix.

[0034] Based on the mass parts of the biomass calcium material powder, the raw materials for preparing the calcium-magnesium composite fireproof and flame-retardant material provided by the present invention include 10 to 30 parts of water, which can be 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts or 30 parts in specific embodiments of the present invention.

[0035] The present invention also provides a method for preparing the calcium-magnesium composite fireproof and flame-retardant material according to the above technical solution, comprising the following steps: mixing the raw materials for preparation to obtain a mixed solution, and drying the mixed solution to obtain the calcium-magnesium composite fireproof and flame-retardant material.

[0036] In the present invention, the mixing preferably includes ultrasonic mixing or stirring mixing; the temperature of the mixing is preferably room temperature.

[0037] In the present invention, the time of the ultrasonic mixing is preferably 20 to 40 min, which can be 20 min, 25 min, 30 min, 35 min or 40 min in specific embodiments of the present invention; the power of the ultrasonic mixing is preferably 20 to 100 W, which can be 20 W, 30 W, 40 W, 50 W, 60 W, 70 W, 80 W, 90 W or 100 W in specific embodiments of the present invention.

[0038] In the present invention, the time of the stirring mixing is preferably 30 to 90 min, which can be 30 min, 35 min, 40 min, 45 min, 50 min, 55 min, 60 min, 65 min, 70 min, 75 min, 80 min, 85 min or 90 min in specific embodiments of the present invention; the speed of the stirring mixing is preferably 200 to 800 r / min, which can be 200 r / min, 250 r / min, 300 r / min, 350 r / min, 400 r / min, 450 r / min, 500 r / min, 550 r / min, 600 r / min, 650 r / min, 700 r / min, 750 r / min, 800 r / min, 850 r / min or 900 r / min in specific embodiments of the present invention. In the present invention, the stirring mixing preferably includes magnetic stirring or mechanical stirring.

[0039] The present invention uses physical mixing to uniformly mix the biomass calcium material powder and magnesium hydroxide, avoiding the agglomeration phenomenon of magnesium hydroxide and the biomass calcium material powder, and enhancing the flame retardancy, tensile strength and elongation rate of the calcium-magnesium composite fireproof and flame-retardant material through the synergistic effect of magnesium hydroxide and the biomass calcium material.

[0040] In the present invention, the drying temperature is preferably 60 - 100°C, and in specific embodiments of the present invention, it can be 60°C, 65°C, 70°C, 75°C, 80°C, 90°C, 95°C or 100°C; the drying time is preferably ≥2 min, more preferably 2 - 10 min, and in specific embodiments of the present invention, it can be 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, 9 min or 10 min.

[0041] The present invention also provides the application of the calcium - magnesium composite fire - retardant material described in the above technical solution or the calcium - magnesium composite fire - retardant material prepared by the preparation method described in the above technical solution in optical cable tapes or cable tapes. The calcium - magnesium composite fire - retardant material provided by the present invention is prepared through steps of ball - milling, mixing, coating and drying. The prepared calcium - magnesium composite fire - retardant material has excellent mechanical properties, fire - retardant properties and tensile strength, and the manufacturing process is simple, raw materials are easy to obtain, it is environmentally friendly and has low cost. It has good application prospects as an optical cable tape or a cable tape.

[0042] The present invention provides a flame - retardant optical / cable, comprising a matrix and a calcium - magnesium composite fire - retardant material coated on the surface of the matrix; the matrix comprises an optical cable or a cable. In the present invention, the material of the matrix preferably comprises fiberglass cloth. In the present invention, the thickness of the calcium - magnesium composite fire - retardant material is preferably 0.15 - 0.20 mm, and in specific embodiments of the present invention, it can be 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm or 0.20 mm.

[0043] The present invention provides a preparation method of the flame - retardant optical / cable described in the above technical solution, comprising the following steps: mixing the raw materials for preparing the calcium - magnesium composite fire - retardant material described in the above technical solution to obtain a mixed solution, coating the mixed solution on the matrix and then drying to obtain the flame - retardant optical / cable.

[0044] In the present invention, the coating preferably comprises coating one side of the matrix and then drying, and then coating the other side and drying. The present invention has no special limitation on the coating, and using the coating methods well - known to those skilled in the art can obtain a calcium - magnesium composite fire - retardant material with a thickness of 0.15 - 0.20 mm.

[0045] In the present invention, the conditions of mixing and drying are the same as those of the mixing and drying of the aforementioned calcium - magnesium composite fire - retardant material, and will not be elaborated here.

[0046] To further illustrate the present invention, the following examples are used to describe in detail the calcium - magnesium composite fire - retardant material provided by the present invention, its preparation method and application, and the flame - retardant optical / cable and its preparation method, but they should not be construed as limiting the protection scope of the present invention.

[0047] In the following examples and comparative examples, the preparation method of the biomass calcium material powder: Put the biomass calcium material into a planetary ball mill, add water for ball milling, the ball milling time is 10 h, the ball milling speed is 300 r / min, and then freeze-dry at -50 °C until constant weight (10 - 24 h) to obtain biomass calcium material powder with a particle size of 40 - 200 μm.

[0048] Example 1

[0049] Take 2.5 parts of oyster shell powder, 2.5 parts of magnesium hydroxide, 4 parts of VAE latex, and 20 parts of water, ultrasonic for 30 min at a power of 100 W, and then stir at 800 r / min in a magnetic stirrer for 1 h to obtain a mixed solution; Use a coater to apply the mixed solution on the fiberglass cloth, heat and dry at 80 °C under normal pressure for 5 min, then turn the fiberglass cloth over, repeat the above coating and drying to obtain a fireproof and flame-retardant tape based on the oyster shell / magnesium hydroxide coating.

[0050] Example 2

[0051] Take 1.67 parts of oyster shell powder, 3.33 parts of magnesium hydroxide, 4 parts of VAE latex, and 20 parts of water, ultrasonic for 30 min at a power of 100 W, and then stir at 800 r / min in a magnetic stirrer for 1 h to obtain a mixed solution; Use a coater to apply the mixed solution on the fiberglass cloth, heat and dry at 80 °C under normal pressure for 5 min, then turn the fiberglass cloth over, repeat the above coating and drying to obtain a fireproof and flame-retardant tape based on the oyster shell / magnesium hydroxide coating.

[0052] Example 3

[0053] Take 3.33 parts of oyster shell powder, 1.67 parts of magnesium hydroxide, 4 parts of VAE latex, and 20 parts of water, ultrasonic for 30 min at a power of 100 W, and then stir at 800 r / min in a magnetic stirrer for 1 h to obtain a mixed solution; Use a coater to apply the mixed solution on the fiberglass cloth, heat and dry at 80 °C under normal pressure for 5 min, then turn the fiberglass cloth over, repeat the above coating and drying to obtain a fireproof and flame-retardant tape based on the oyster shell / magnesium hydroxide coating.

[0054] Example 4

[0055] Take 2.5 parts of shell powder, 2.5 parts of magnesium hydroxide, 4 parts of VAE latex, and 20 parts of water, ultrasonic for 30 min at a power of 100 W, and then stir at 800 r / min in a magnetic stirrer for 1 h to obtain a mixed solution; Use a coater to apply the mixed solution on the fiberglass cloth, heat and dry at 80 °C under normal pressure for 5 min, then turn the fiberglass cloth over, repeat the above coating and drying to obtain a fireproof and flame-retardant tape based on the shell / magnesium hydroxide coating.

[0056] Example 5

[0057] Take 2.5 parts of eggshell powder, 2.5 parts of magnesium hydroxide, 4 parts of VAE latex, and 20 parts of water. Ultrasonic for 30 min at a power of 100 W, and then stir in a magnetic stirrer at 800 r / min for 1 h to obtain a mixed solution; use a coater to apply the mixed solution on a fiberglass cloth. After coating on the fiberglass cloth, heat and dry it at normal pressure at 80 °C for 5 min, then turn the fiberglass cloth over and repeat the above coating and drying to obtain a fireproof and flame-retardant tape based on an eggshell / magnesium hydroxide coating.

[0058] Comparative Example 1

[0059] The difference from Example 1 is only that: replace magnesium hydroxide with an equal amount of oyster shell powder to obtain a fireproof and flame-retardant tape based on an oyster shell coating.

[0060] Comparative Example 2

[0061] The difference from Example 1 is only that: replace oyster shell powder with an equal amount of magnesium hydroxide to obtain a fireproof and flame-retardant tape based on a magnesium hydroxide coating.

[0062] Test Example 1

[0063] Performance Evaluation

[0064] Carry out flame retardancy, oxygen index, gram weight and mechanical property tests on the tapes prepared in the examples and comparative examples.

[0065] 1. Flame Retardancy Test

[0066] The oxygen index of the tape is measured in an oxygen index measuring instrument. Under the specified conditions, the lowest oxygen concentration required for the material to burn with a flame in an oxygen-nitrogen mixed gas stream. The lower the oxygen index (LOI), the easier the material is to burn.

[0067] 2. Mechanical Property Test

[0068] Cut the tape into strip samples of 250 mm × 40 mm and test them in a universal tensile testing machine at 50 mm / min.

[0069] Table 1 Performance Test Results of the Tapes Prepared in Examples and Comparative Examples

[0070]

[0071] As can be seen from Table 1, the oxygen indexes of the tapes prepared in the examples and comparative examples all reach 100%, showing excellent flame retardancy. In particular, Example 1 with the compounding of oyster shell and magnesium hydroxide shows the best comprehensive performance in terms of tensile strength, elongation at break, gram weight, thickness and other indicators while maintaining an oxygen index of 100%.

[0072] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A calcium-magnesium composite fireproof and flame-retardant material, and by mass parts, the preparation raw materials include: 1 - 10 parts of biomass calcium material, 1 - 10 parts of magnesium hydroxide, 2 - 8 parts of VAE latex, and 10 - 30 parts of water.

2. The calcium-magnesium composite fireproof and flame-retardant material according to claim 1, characterized in that, The biomass calcium material includes one or more of shell, oyster shell, and eggshell; Before use, the biomass calcium material is crushed and then dried to obtain biomass calcium material powder; The particle size of the biomass calcium material powder is 40 - 200 μm.

3. The preparation method of the calcium-magnesium composite fireproof and flame-retardant material according to claim 1 or 2, comprising the following steps: Mix the preparation raw materials to obtain a mixed solution, and dry the mixed solution to obtain the calcium-magnesium composite fireproof and flame-retardant material.

4. The preparation method according to claim 3, characterized in that, The mixing includes ultrasonic mixing or stirring mixing; The time of the ultrasonic mixing is 20 - 40 min, and the power is 20 - 100 W; The time of the stirring mixing is 30 - 90 min, and the speed is 200 - 800 r / min.

5. The preparation method according to claim 3, characterized in that, The drying temperature is 60 - 100 °C.

6. The application of the calcium-magnesium composite fireproof and flame-retardant material according to any one of claims 1 - 2 or the calcium-magnesium composite fireproof and flame-retardant material prepared by the preparation method according to any one of claims 3 - 5 in optical cable tape or cable tape.

7. A flame-retardant optical / cable, comprising a matrix and a calcium-magnesium composite fireproof and flame-retardant material coated on the surface of the matrix; the matrix includes an optical cable or a cable.

8. The preparation method of the flame-retardant optical / cable according to claim 7, comprising the following steps: Mix the preparation raw materials of the calcium-magnesium composite fireproof and flame-retardant material according to any one of claims 1 - 2 to obtain a mixed solution, coat the mixed solution on the matrix and then dry it to obtain the flame-retardant optical / cable.

9. The preparation method according to claim 8, wherein The mixing includes ultrasonic mixing or stirring mixing; The time of the ultrasonic mixing is 20 - 40 min, and the power is 20 - 100 W; The time of the stirring mixing is 30 - 90 min, and the speed is 200 - 800 r / min.

10. The preparation method according to claim 8, characterized in that, The drying temperature is 60 - 100 °C.

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