Spinning solution for flame-retardant ultra-high molecular weight polyethylene fiber and preparation method thereof

Abstract

The present invention provides a spinning solution for flame-retardant ultra-high molecular weight polyethylene fibers and a preparation method thereof. The spinning solution comprises 6-12% ultra-high molecular weight polyethylene powder, 1-4% melamine cyanurate (MCA), 1-4% nano-alumina, 1-4% silane coupling agent, 1-4% titanate coupling agent, 1-4% wetting and dispersing agent, 0.05-1% antioxidant, and the balance being white oil. The above components are subjected to processes such as wetting, grinding, and dispersion to obtain a spinning solution. Fibers spun from this spinning solution have excellent flame retardancy, and the flame retardant in the fibers maintains good stability during fiber processing. The preparation method is simple and easy to operate, making it suitable for widespread promotion and application.

Description

Technical Field

[0001] The present invention relates to the technical field of ultra-high molecular weight polyethylene fibers, and in particular to a spinning solution for flame-retardant ultra-high molecular weight polyethylene fibers and a preparation method thereof. Background Art

[0002] With the improvement of the understanding of the performance of ultra-high molecular weight polyethylene fibers, ultra-high molecular weight polyethylene fibers and their products are playing an increasingly important role in the development of modern society. Accordingly, their manufacturing technology, the manufacturing technology and quality of downstream products are constantly improving, and their application fields are also constantly expanding. They have been used in the fields of aviation, biomedicine, sports goods, etc.

[0003] In recent years, the use of ultra-high molecular weight polyethylene (UHMWPE) fibers in the textile field has been increasing, gradually attracting attention. Although UHMWPE fibers have unique properties such as high specific strength, high specific modulus, and chemical inertness, the molecular chains of UHMWPE fibers are mainly composed of C and H, which are highly flammable. Data show that UHMWPE fibers have a very low limiting oxygen index, generate large amounts of heat and smoke during combustion, and can also produce molten droplets, causing secondary disasters. These shortcomings of UHMWPE fibers have greatly limited their application in construction, clothing, and other areas. Although there is research on the flame retardancy of UHMWPE fibers, industrialized products have not yet appeared.

[0004] Many factors affect the industrialization of ultra-high molecular weight polyethylene (UHMWPE) fibers, the most prominent of which is the stability of flame retardants during the processing and use of UHMWPE fibers. During the spinning process, UHMWPE fibers are first processed from the spinning solution through a series of processes such as twin-screw dissolution to form jelly yarns. This then enters the extraction process. When the jelly yarns come into contact with the extractant, due to the double diffusion effect, not only the white oil as a solvent can diffuse into the extractant, but also the flame retardant in the fibers can migrate and diffuse into the extractant, resulting in flame retardant contamination of the extractant and posing a significant challenge in the subsequent separation of the extractant mixture. Furthermore, UHMWPE fibers are non-polar polymers and lack a strong interaction with the flame retardant. Therefore, during the subsequent stretching process, when the fibers rub against the drafting rollers, the flame retardant on the fiber surface easily falls off, contaminating the drafting roller surface and significantly reducing the flame retardant effect of the finished fiber. These technical challenges result in poor stability of the flame retardant in UHMWPE fibers, making industrialization difficult.

[0005] The document with publication number CN101362835A discloses a "surface treatment method for magnesium hydroxide flame retardant". The core idea is to treat the surface of the flame retardant magnesium hydroxide with a coupling agent, with the ultimate goal of increasing the dispersibility and compatibility of the flame retardant in polymeric materials.

[0006] The document with publication number CN102220066A discloses "a flame-retardant coating for wood-plastic composite materials containing inorganic flame retardants". The technology uses polymers such as epoxy resin and curing agent, as well as flame retardants and additives. There is no solvent in the formula. After the coating is applied, the substances in the formula become coating materials.

[0007] Although both of the above-mentioned documents provide flame retardant treatment methods, there is no solution to the problem of flame retardant migration during the preparation of ultra-high molecular weight polyethylene fibers. Therefore, providing a spinning solution and a preparation method for preventing flame retardant migration during the preparation of ultra-high molecular weight polyethylene fibers is of great significance to the industrial development of ultra-high molecular weight polyethylene fibers. Summary of the Invention

[0008] In response to the above-mentioned deficiencies in the prior art, the present invention provides a spinning solution for flame-retardant ultra-high molecular weight polyethylene fibers and a preparation method thereof. The spinning solution comprises ultra-high molecular weight polyethylene powder, melamine cyanurate, nano-alumina, a silane coupling agent, a titanate coupling agent, a wetting and dispersing agent, an antioxidant, and white oil. The above components are subjected to processes such as wetting, grinding, and dispersion to obtain the spinning solution. The fibers spun from the spinning solution have good flame retardant properties, and the flame retardant in the fibers has good stability during the fiber processing process. The preparation method is simple and easy to operate, and is suitable for wide promotion and application.

[0009] The technical solutions of the present invention are as follows:

[0010] A spinning solution for flame-retardant ultra-high molecular weight polyethylene fibers, comprising the following components in percentage by weight:

[0011] Ultra-high molecular weight polyethylene powder: 6-12%, melamine cyanurate (MCA): 1-4%, nano-alumina: 1-4%, silane coupling agent: 1-4%, titanate coupling agent: 1-4%, wetting and dispersing agent: 1-4%, antioxidant: 0.05-1%, and the balance is white oil.

[0012] In the spinning solution, melamine cyanurate (MCA) is a high-nitrogen halogen-free environmentally friendly flame retardant, and nano-alumina has good thermal conductivity. When the complex structure formed by the connection between melamine cyanurate and nano-alumina contacts a heat source, part of the heat can be conducted away through the thermal conductivity of nano-alumina, thereby playing a preliminary flame retardant role. When the heat of the heat source accumulates to a certain extent, melamine cyanurate will play a flame retardant role in the gas phase and the condensed phase. Therefore, with the effective synergy of the two, a good flame retardant effect is achieved; in addition, with the synergistic effect of the silane coupling agent and the titanate coupling agent, the interaction force between the complex structure and the ultra-high molecular weight polyethylene can be enhanced, effectively solving the problem of flame retardant migration on the surface of ultra-high molecular weight polyethylene fibers in the wet spinning process, thereby realizing the industrial production of ultra-high molecular weight polyethylene fibers.

[0013] Preferably, the weight percentage of the ultra-high molecular weight polyethylene powder is 6-12%, and the viscosity average molecular weight is 1×10 6 ~9×10 6 .

[0014] Preferably, the weight percentage of the ultra-high molecular weight polyethylene powder is 8-10%, and the viscosity average molecular weight is 3×10 6 ~7×10 6 .

[0015] Preferably, the weight percentage of the melamine cyanurate is 1-2%, and the average particle size is 0.1-1 μm.

[0016] Preferably, the weight percentage of the nano-aluminum oxide is 1-2%, and the average particle size is 0.05-0.1 μm.

[0017] Preferably, the weight percentage of the silane coupling agent is 1-2%, and the silane coupling agent is one of US i-2301, US i-2302, and US i-2311; the weight percentage of the titanate coupling agent is 1-2%, and the titanate coupling agent is one of Plenact TTS, Plenact 46B, and Plenact 55.

[0018] Preferably, the weight percentage of the wetting and dispersing agent is 1-2%, and the weight percentage of the antioxidant is 0.05-0.3%.

[0019] Preferably, the kinematic viscosity (40°C) of the white oil is 30 to 100 mm 2 / s.

[0020] The method for preparing the spinning solution for the flame-retardant ultra-high molecular weight polyethylene fiber is as follows:

[0021] (1) white oil is taken, the weight of which accounts for 50% of the total weight of the spinning solution, and a wetting dispersant, melamine cyanurate and nano-alumina are dispersed therein, and the mixture is ground using a grinder for 30 minutes, and then a silane coupling agent is slowly and evenly added dropwise, the grinder speed is adjusted to 1000-2000 rpm, the temperature is maintained at 80-100° C., and the mixture is treated for 2-4 hours to obtain a melamine cyanurate-nano-alumina complex structure flame retardant slurry;

[0022] (2) adding an antioxidant and ultra-high molecular weight polyethylene powder to the remaining white oil in sequence, stirring at a speed of 300 to 500 rpm, and treating for 2 to 3 hours to obtain an ultra-high molecular weight polyethylene base material;

[0023] (3) After uniformly mixing the flame retardant slurry of step (1) and the ultra-high molecular weight polyethylene base material of step (2), grind them using a grinder for 30 minutes, then slowly and evenly add the titanate coupling agent, adjust the grinder speed to 500-1000 rpm, maintain the temperature at 70-80°C, and process for 3-6 hours to complete the spinning solution preparation.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The silane coupling agent in the present invention utilizes its hydroxyl and epoxy end group structures to connect melamine cyanurate to nano-alumina to form a complex structure, thereby improving the dispersibility of the flame retardant, increasing the compatibility of the flame retardant with the polymer matrix, and improving the flame retardant performance.

[0026] 2. In this invention, one end of the organic molecular chain of the titanate coupling agent is entangled with the ultra-high molecular weight polyethylene molecular chain, while the other end is physically connected to the flame retardant. Simultaneously, the silane coupling agent connects the melamine cyanurate and nano-alumina through complexation. The combined action of the silane coupling agent and the titanate coupling agent creates physical connections between the flame retardant molecules and between the flame retardant molecules and the ultra-high molecular weight polyethylene molecular chain, forming a three-dimensional network structure, thus eliminating the problem of flame retardant migration.

[0027] 3. The spinning solution provided by the present invention is composed of white oil, ultra-high molecular weight polyethylene powder, melamine cyanurate, nano-alumina, silane coupling agent, titanate coupling agent, wetting dispersant, and antioxidant, and is prepared through wetting, grinding, dispersion and other processes; the fiber spun from this spinning solution has good flame retardant properties, and the flame retardant in the fiber has good stability during the fiber processing process.

[0028] 4. The ultra-high molecular weight polyethylene fiber spinning solution provided by the present invention has good flame retardancy and flame retardant stability. The preparation method is simple and easy to operate, and is suitable for wide promotion and application. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0030] Example 1

[0031] A method for preparing a spinning solution for flame-retardant ultra-high molecular weight polyethylene fiber, the process is as follows:

[0032] (1) Take 500g of white oil, disperse 10g of wetting dispersant, 10g of melamine cyanurate and 10g of nano-alumina in it, grind it with a grinder for 30 minutes, then slowly and evenly add 10g of silane coupling agent, adjust the grinder speed to 1000rpm, maintain the temperature at 90°C, and treat for 4 hours to obtain a melamine cyanurate-nano-alumina complex structure flame retardant slurry;

[0033] Among them, the wetting and dispersing agent DISPERBYK-140 was purchased from BYK; the average particle size of melamine cyanurate was 0.1 to 1 μm and was commercially available; the average particle size of nano-alumina was 0.05 to 0.1 μm and was commercially available; the silane coupling agent was US i-2301, purchased from Liansi Chemical Co., Ltd.; the kinematic viscosity of the white oil (40°C) was 30 mm 2 / s, purchased from Zhejiang Zhengxin Petroleum Technology Co., Ltd.;

[0034] (2) 1 g of antioxidant and 80 g of ultra-high molecular weight polyethylene powder with a viscosity-average molecular weight of 7 million were added to 369 g of white oil in sequence, stirred at 500 rpm, and treated for 2 hours to obtain an ultra-high molecular weight polyethylene base material;

[0035] Among them, ultra-high molecular weight polyethylene powder was purchased from Korea Petrochemical Corporation, batch number U070 22F168; antioxidant was purchased from Yingkou Fengguang New Materials Co., Ltd., compounded from 168 and 1010;

[0036] (3) After uniformly mixing the flame retardant slurry of step (1) and the ultra-high molecular weight polyethylene base material of step (2), the mixture was ground using a grinder for 30 minutes, and then 10 g of a titanate coupling agent was slowly and evenly added, wherein the titanate coupling agent was P l enact TTS; the grinder speed was adjusted to 800 rpm, the temperature was maintained at 70°C, and the mixture was treated for 4 hours. The viscosity of the spinning solution was detected to be 105 mPa.s, and a spinning solution sample 1 for flame retardant ultra-high molecular weight polyethylene fiber was obtained, wherein the ultra-high molecular weight polyethylene powder content was 8% and the flame retardant content was 2%.

[0037] Example 2

[0038] A method for preparing a spinning solution for flame-retardant ultra-high molecular weight polyethylene fiber, the process is as follows:

[0039] (1) Take 500g of white oil, disperse 15g of wetting dispersant, 15g of melamine cyanurate and 15g of nano-alumina in it, grind it with a grinder for 30 minutes, then slowly and evenly add 15g of silane coupling agent, adjust the grinder speed to 1500rpm, maintain the temperature at 90°C, and treat for 4 hours to obtain a melamine cyanurate-nano-alumina complex structure flame retardant slurry;

[0040] Among them, the wetting and dispersing agent DISPERBYK-140 was purchased from BYK; the average particle size of melamine cyanurate was 0.1 to 1 μm and was commercially available; the average particle size of nano-alumina was 0.05 to 0.1 μm and was commercially available; the silane coupling agent was US i-2301, purchased from Liansi Chemical Co., Ltd.; the kinematic viscosity of the white oil (40°C) was 70 mm 2 / s, purchased from Zhejiang Zhengxin Petroleum Technology Co., Ltd.;

[0041] (2) 1 g of antioxidant and 80 g of ultra-high molecular weight polyethylene powder with a viscosity-average molecular weight of 7 million were added to 344 g of white oil in sequence, stirred at 500 rpm, and treated for 2 hours to obtain an ultra-high molecular weight polyethylene base material;

[0042] Among them, ultra-high molecular weight polyethylene powder was purchased from Korea Petrochemical Corporation, batch number U070 22F168; antioxidant was purchased from Yingkou Fengguang New Materials Co., Ltd., compounded from 168 and 1010;

[0043] (3) After uniformly mixing the flame retardant slurry of step (1) and the ultra-high molecular weight polyethylene base material of step (2), the mixture was ground using a grinder for 30 minutes, and then 15 g of a titanate coupling agent was slowly and evenly added, wherein the titanate coupling agent was P l enact46B; the grinder speed was adjusted to 800 rpm, the temperature was maintained at 70°C, and the mixture was treated for 5 hours. The viscosity of the spinning solution was detected to be 108 mPa.s, and a spinning solution sample 2 for flame retardant ultra-high molecular weight polyethylene fiber was obtained, wherein the ultra-high molecular weight polyethylene powder content was 8% and the flame retardant content was 3%.

[0044] Example 3

[0045] A method for preparing a spinning solution for flame-retardant ultra-high molecular weight polyethylene fiber, the process is as follows:

[0046] (1) Take 500g of white oil, disperse 10g of wetting dispersant, 10g of melamine cyanurate and 10g of nano-alumina in it, grind it with a grinder for 30 minutes, then slowly and evenly add 10g of silane coupling agent, adjust the grinder speed to 2000rpm, maintain the temperature at 90°C, and treat for 2.5 hours to obtain a melamine cyanurate-nano-alumina complex structure flame retardant slurry;

[0047] Among them, the wetting and dispersing agent DISPERBYK-140 was purchased from BYK; the average particle size of melamine cyanurate was 0.1 to 1 μm and was commercially available; the average particle size of nano-alumina was 0.05 to 0.1 μm and was commercially available; the silane coupling agent was US i-2301, purchased from Liansi Chemical Co., Ltd.; the kinematic viscosity of the white oil (40°C) was 70 mm 2 / s, purchased from Zhejiang Zhengxin Petroleum Technology Co., Ltd.;

[0048] (2) 1 g of antioxidant and 100 g of ultra-high molecular weight polyethylene powder with a viscosity-average molecular weight of 4,000,000 were added to 349 g of white oil in sequence, stirred at 500 rpm, and treated for 2 hours to obtain an ultra-high molecular weight polyethylene base material;

[0049] Among them, ultra-high molecular weight polyethylene powder was purchased from Sinopec Yanshan Petrochemical, batch number X3004F; antioxidant was purchased from Yingkou Fengguang New Materials Co., Ltd., a compound of 168 and 1010;

[0050] (3) After uniformly mixing the flame-retardant slurry of step (1) and the ultra-high molecular weight polyethylene base material of step (2), the mixture was ground using a grinder for 30 minutes, and then 10 g of a titanate coupling agent (Plene t55) was slowly and evenly added thereto; the grinder speed was adjusted to 800 rpm, the temperature was maintained at 70°C, and the mixture was treated for 5 hours. The viscosity of the spinning solution was detected to be 105 mPa.s, and a spinning solution sample 3 for flame-retardant ultra-high molecular weight polyethylene fiber was obtained, wherein the ultra-high molecular weight polyethylene powder content was 10% and the flame retardant content was 2%.

[0051] Comparative Example 1

[0052] A method for preparing a spinning solution for flame-retardant ultra-high molecular weight polyethylene fiber, the process is as follows:

[0053] (1) Take 500g of white oil, disperse 10g of wetting dispersant and 20g of melamine cyanurate in it, grind it with a grinder for 30 minutes, then slowly and evenly add 10g of silane coupling agent, adjust the grinder speed to 1500rpm, maintain the temperature at 90°C, and treat for 3 hours to obtain melamine cyanurate flame retardant slurry;

[0054] Among them, the wetting and dispersing agent DISPERBYK-140 was purchased from BYK; the average particle size of melamine cyanurate was 0.1 to 1 μm and was commercially available; the silane coupling agent was US i-2301, purchased from Liansi Chemical Co., Ltd.; the kinematic viscosity of the white oil (40°C) was 30 mm 2 / s, purchased from Zhejiang Zhengxin Petroleum Technology Co., Ltd.;

[0055] (2) 1 g of antioxidant and 80 g of ultra-high molecular weight polyethylene powder with a viscosity-average molecular weight of 7 million were added to 369 g of white oil in sequence, stirred at 500 rpm, and treated for 2 hours to obtain an ultra-high molecular weight polyethylene base material;

[0056] Among them, ultra-high molecular weight polyethylene powder was purchased from Korea Petrochemical Corporation, batch number U070 22F168; antioxidant was purchased from Yingkou Fengguang New Materials Co., Ltd., compounded from 168 and 1010;

[0057] (3) After uniformly mixing the flame retardant slurry of step (1) and the ultra-high molecular weight polyethylene base material of step (2), the mixture was ground using a grinder for 30 minutes, and then 10 g of a titanate coupling agent was slowly and evenly added, wherein the titanate coupling agent was P l enact TTS; the grinder speed was adjusted to 800 rpm, the temperature was maintained at 70°C, and the mixture was treated for 4 hours. The viscosity of the spinning solution was detected to be 102 mPa.s, and a spinning solution sample 4 for flame retardant ultra-high molecular weight polyethylene fiber was obtained, wherein the ultra-high molecular weight polyethylene powder content was 8% and the flame retardant content was 2%.

[0058] Comparative Example 2

[0059] A method for preparing a spinning solution for flame-retardant ultra-high molecular weight polyethylene fiber, the process is as follows:

[0060] (1) Take 500g of white oil, disperse 10g of wetting dispersant, 10g of melamine cyanurate and 10g of nano-alumina in it, grind it with a grinder for 30 minutes, then slowly and evenly add silane coupling agent dropwise, adjust the grinder speed to 1500rpm, maintain the temperature at 90°C, and treat for 3 hours to obtain a melamine cyanurate-nano-alumina complex structure flame retardant slurry;

[0061] Among them, the wetting and dispersing agent DISPERBYK-140 was purchased from BYK; the average particle size of melamine cyanurate was 0.1 to 1 μm and was commercially available; the average particle size of nano-alumina was 0.05 to 0.1 μm and was commercially available; the silane coupling agent was US i-2301, purchased from Liansi Chemical Co., Ltd.; the kinematic viscosity of the white oil (40°C) was 30 mm 2 / s, purchased from Zhejiang Zhengxin Petroleum Technology Co., Ltd.;

[0062] (2) 1 g of antioxidant and 80 g of ultra-high molecular weight polyethylene powder with a viscosity-average molecular weight of 7 million were added to 389 g of white oil in sequence, stirred at 500 rpm, and treated for 2 hours to obtain an ultra-high molecular weight polyethylene base material;

[0063] Among them, ultra-high molecular weight polyethylene powder was purchased from Korea Petrochemical Corporation, batch number U070 22F168; antioxidant was purchased from Yingkou Fengguang New Materials Co., Ltd., compounded from 168 and 1010;

[0064] (3) After uniformly mixing the flame retardant slurry of step (1) and the ultra-high molecular weight polyethylene base material of step (2), the mixture was ground in a grinder for 30 minutes, the grinding speed was adjusted to 800 rpm, the temperature was maintained at 70°C, and the mixture was treated for 4 hours. The viscosity of the spinning solution was detected to be 98 mPa.s, and a spinning solution sample 5 for flame retardant ultra-high molecular weight polyethylene fiber was obtained, which had an ultra-high molecular weight polyethylene powder content of 8% and a flame retardant content of 2%.

[0065] Comparative Example 3

[0066] 1 g of antioxidant and 80 g of ultra-high molecular weight polyethylene powder with a viscosity-average molecular weight of 7 million were added to 919 g of white oil, stirred at a speed of 500 rpm, and treated for 2 hours to obtain an ultra-high molecular weight polyethylene base material. The mixture was transferred to a grinder, the speed was increased to 800 rpm, the temperature was maintained at 70°C, and treated for 4 hours. The viscosity of the spinning solution was detected to be 95 mPa.s, and a spinning solution sample 6 for ultra-high molecular weight polyethylene fiber was obtained, which had an ultra-high molecular weight polyethylene powder content of 8% and did not contain a flame retardant; the reagents were the same as in Example 1.

[0067] Experimental Example 1: Migration of flame retardant in extractant

[0068] 10g of the ultra-high molecular weight polyethylene jelly fiber produced by the twin-screw extruder was placed in an extractant with a bath ratio of 1:20 and subjected to ultrasonic extraction at a frequency of 53kHz. Each sample was extracted three times, each time for 15 minutes. The extracted liquid was distilled and filtered, and the resulting white powder was dried and weighed. Three parallel tests were performed for each example, and the average value was taken and recorded as the amount of flame retardant in the extract G. q .

[0069] The mobility of flame retardants in extractants is characterized by the following formula:

[0070]

[0071] Where:

[0072] G q ——the amount of flame retardant measured in the extract (g);

[0073] G——Theoretical total content of flame retardant in jelly yarn (g).

[0074] Experimental Example 2

[0075] The peeling of the flame retardant on the fiber surface during the spinning process, the mobility of the flame retardant during the extraction process, and the flame retardant properties of the fibers of Examples 1 to 3 and Comparative Examples 1 to 3 were tested and analyzed. The results are shown in Table 1 below.

[0076] Table 1 Results and statistics

[0077]

[0078] Note: The test method for limiting oxygen index is GB / T5454-1997. Three parallel tests were conducted for each example, and the average value was taken. The results are shown in Table 1.

[0079] Combined with the above test results, it can be seen that the spinning solution for flame-retardant ultra-high molecular weight polyethylene fiber prepared by the present invention has good spinnability and good flame retardant properties. At the same time, it solves the problem of stability of flame retardants in fibers during the spinning process, effectively solves the industry problem of flame retardants migrating from fibers to extractants during the spinning process, and avoids the problem of contamination of the drafting roller due to the peeling of flame retardants.

[0080] Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who can easily conceive of changes or substitutions within the technical scope disclosed in the present invention shall be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope of protection of the claims.

Claims

1. A spinning solution for flame-retardant ultra-high molecular weight polyethylene fiber, characterized in that: The composition comprises the following components in weight percentage: Ultra-high molecular weight polyethylene powder: 6-12%, melamine cyanurate (MCA): 1-4%, nano-alumina: 1-4%, silane coupling agent: 1-4%, titanate coupling agent: 1-4%, wetting and dispersing agent: 1-4%, antioxidant: 0.05-1%, balance is white oil; Wherein, the silane coupling agent is one of USi-2301, USi-2302, and USi-2311; The method for preparing the spinning solution for the flame-retardant ultra-high molecular weight polyethylene fiber is as follows: (1) Take white oil, the weight of which accounts for 50% of the total weight of the spinning solution, disperse the wetting dispersant, melamine cyanurate and nano-alumina in it, grind it with a grinder for 30 minutes, then slowly and evenly add the silane coupling agent, adjust the grinder speed to 1000-2000 rpm, maintain the temperature at 80-100°C, and treat for 2-4 hours to obtain a melamine cyanurate-nano-alumina complex structure flame retardant slurry; (2) adding an antioxidant and ultra-high molecular weight polyethylene powder to the remaining white oil in sequence, stirring at a speed of 300 to 500 rpm, and treating for 2 to 3 hours to obtain an ultra-high molecular weight polyethylene base material; (3) After uniformly mixing the flame retardant slurry of step (1) and the ultra-high molecular weight polyethylene base material of step (2), grind them in a grinder for 30 minutes, then slowly and evenly add the titanate coupling agent, adjust the grinder speed to 500-1000 rpm, maintain the temperature at 70-80°C, and process for 3-6 hours to complete the spinning solution preparation.

2. The spinning solution for flame-retardant ultra-high molecular weight polyethylene fiber according to claim 1, wherein The weight percentage of the ultra-high molecular weight polyethylene powder is 6-12%, and the viscosity average molecular weight is 1×10 6 ~9×10 6 .

3. The spinning solution for flame-retardant ultra-high molecular weight polyethylene fiber according to claim 2, wherein: The weight percentage of the ultra-high molecular weight polyethylene powder is 8-10%, and the viscosity average molecular weight is 3×10 6 ~7×10 6 .

4. The spinning solution for flame-retardant ultra-high molecular weight polyethylene fiber according to claim 1, wherein The weight percentage of the melamine cyanurate is 1-2%, and the average particle size is 0.1-1 μm.

5. The spinning solution for flame-retardant ultra-high molecular weight polyethylene fiber according to claim 1, wherein The weight percentage of the nano-aluminum oxide is 1-2%, and the average particle size is 0.05-0.1 μm.

6. The spinning solution for flame-retardant ultra-high molecular weight polyethylene fiber according to claim 1, wherein The weight percentage of the silane coupling agent is 1-2%, the weight percentage of the titanate coupling agent is 1-2%, and the titanate coupling agent is one of Plenact TTS, Plenact 46B, and Plenact 55.

7. The spinning solution for flame-retardant ultra-high molecular weight polyethylene fiber according to claim 1, wherein: The weight percentage of the wetting and dispersing agent is 1-2%, and the weight percentage of the antioxidant is 0.05-0.3%.

8. The spinning solution for flame-retardant ultra-high molecular weight polyethylene fiber according to claim 1, wherein: The kinematic viscosity of the white oil at 40°C is 30-100 mm 2 / s.

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