Terylene industrial yarn containing rare earth flame retardant

Abstract

The invention relates to a polyester industrial yarn containing a rare earth flame retardant, raw materials of the polyester industrial yarn mainly comprise the rare earth flame retardant, the mass fraction of the rare earth flame retardant in the polyester industrial yarn is 6-9%, the rare earth flame retardant is a compound of porous carbon aerogel, and the components of the rare earth flame retardant mainly comprise porous carbon aerogel and lanthanum hydroxide. The preparation method has the technical characteristics that the physical barrier of the porous carbon aerogel is combined with the chemical flame retardancy of lanthanum hydroxide and magnesium hydroxide to form a multi-scale synergistic flame-retardant system of adsorption, heat absorption, oxygen isolation and char formation, so that the efficient and continuous flame-retardant property of the polyester is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of textile production, specifically, a polyester industrial yarn containing a rare earth flame retardant.

Background Art

[0002] Due to its high strength, abrasion resistance and chemical resistance, polyester industrial yarn is widely used in fields such as tire cord fabrics, seat belts, and geotechnical materials. However, the limiting oxygen index (LOI) of polyester is only about 15%, belonging to flammable materials, which are prone to burning and dripping at high temperatures, posing safety hazards. Therefore, improving the flame retardancy of polyester is a key requirement in industrial applications. Introducing rare earth flame retardants into polyester industrial yarn can improve the flame retardancy through copolymerization, blending or surface modification, etc., without significantly reducing the mechanical properties of the material, which is a new hot spot in the current research on flame retardants. And this application starts from the rare earth material lanthanum hydroxide, and adsorbs the rare earth material lanthanum hydroxide on the pores of porous carbon aerogel to achieve an efficient and continuous flame retardant effect, so as to overcome the technical pain point of the poor persistence of traditional flame retardants.

Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a polyester industrial yarn containing a rare earth flame retardant.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A polyester industrial yarn containing a rare earth flame retardant, the raw materials of which mainly include a rare earth flame retardant, and the mass fraction of the rare earth flame retardant in the polyester industrial yarn is 6-9%.

[0006] The mass fraction of the rare earth flame retardant in the polyester industrial yarn is 7-8%.

[0007] The rare earth flame retardant is a composite of porous carbon aerogel.

[0008] The components of the rare earth flame retardant mainly include porous carbon aerogel and lanthanum hydroxide.

[0009] A preparation method of a rare earth flame retardant, the specific steps are as follows:

[0010] (1) Pretreatment of porous carbon aerogel: The porous carbon aerogel can be soaked in a 3-5% nitric acid solution for 1-2 hours, and then washed with deionized water to obtain a solution of pretreated porous carbon aerogel;

[0011] In order to enhance the binding force between the porous carbon aerogel and the hydroxide, this step improves the surface polarity of the porous carbon aerogel by introducing oxygen-containing groups (such as -COOH, -OH), and promotes the interfacial interaction with lanthanum hydroxide and magnesium hydroxide;

[0012] The porous carbon aerogel uses lignin as the carbon source and zinc chloride as the template pore-forming agent. After heating reaction and carbonization reaction, porous carbon aerogels with different porosities and densities are prepared by controlling the lignin / zinc chloride content ratio, reaction temperature, and carbonization temperature. The mass ratio of lignin to zinc chloride is between 1 / 1 and 4 / 1, the reaction temperature is between 150 and 180 °C, and the carbonization temperature is between 700 and 900 °C.

[0013] (2) Rare earth suspension: Take lanthanum hydroxide (La(OH)3) and magnesium hydroxide (Mg(OH)2) powders and mix them to obtain a mixed powder. Add the mixed powder to deionized water and ultrasonically disperse for 30 minutes to obtain a suspension with a mixed powder concentration of 10 - 20 mg / mL.

[0014] The mass ratio of lanthanum hydroxide (La(OH)3) to magnesium hydroxide is 1:0.9 - 1:1.1, preferably 1:1.

[0015] The mass ratio of the porous carbon aerogel to lanthanum hydroxide is 2:0.9 - 2:1.2, preferably 2:1.

[0016] (3) Mix the solution of the pretreated porous carbon aerogel in step (1) and the suspension in step (2), and stir or ultrasonically treat at room temperature for 1 - 3 hours to promote the uniform adsorption of lanthanum hydroxide and magnesium hydroxide particles on the pore surface of the porous carbon aerogel.

[0017] (4) Filter the mixed solution in step (3) with filter paper or microporous membrane to separate the loaded porous carbon aerogel; wash it repeatedly with deionized water 3 - 5 times to remove unadsorbed hydroxide particles and dispersant residues, and obtain the washed porous carbon aerogel.

[0018] (5) Place the washed porous carbon aerogel in step (4) in a vacuum drying oven and dry it at 60 ± 2 °C for 48 ± 1 hour to obtain the rare earth flame retardant, which is the composite of the porous carbon aerogel; the porous structure of the porous carbon aerogel can be retained.

[0019] A method for preparing a polyester industrial yarn containing a rare earth flame retardant. After mixing the rare earth flame retardant and polyester chips, melt extrusion is carried out, and then melt spinning is carried out to obtain the polyester industrial yarn.

[0020] The temperature of melt spinning is 240 - 270 °C, and the spinning speed is 2500 - 2900 m / min; when cooling, the cooling temperature is 18 - 21 °C, the cooling humidity is 60 - 80%, and the cooling wind speed is 0.4 - 0.6 m / s; the stretching is divided into pre-stretching and main stretching, the multiple of pre-stretching is 1 - 2 times, and the main stretching is 2 - 4 times.

[0021] The porous carbon aerogel of the present application has a high specific surface area and a porous structure, which provides loading sites for lanthanum hydroxide and magnesium hydroxide, promoting their uniform dispersion; and the porous structure can hinder the transfer of heat and oxygen, enhancing the continuous heat insulation, oxygen isolation and flame retardant effect.

[0022] The mixed powder of lanthanum hydroxide / magnesium hydroxide of the present application can absorb heat to lower the material temperature and release water to dilute flammable gases when heated and decomposed; the formed lanthanum oxide and magnesium oxide form a dense protective layer on the material surface, inhibiting the spread of combustion and enhancing the flame retardant effect.

[0023] The limiting oxygen index (LOI) of the polyester industrial yarn of the present application is greater than 28%, and the test is carried out according to the oxygen index method for testing the combustion performance of textiles GB / T 5454-1997.

[0024] The initial limiting oxygen index (LOI) of the polyester industrial yarn is L1;

[0025] The polyester industrial yarn is placed at 50 °C for 240 hours and then tested. Its limiting oxygen index is L2, and the decline rate of the limiting oxygen index is within 5.5%; preferably within 5%;

[0026] The decline rate of the limiting oxygen index = [(L1 - L2) / L1] * 100%.

[0027] Compared with the prior art, the positive effects of the present invention are:

[0028] The physical barrier of the porous carbon aerogel of the present application is combined with the chemical flame retardancy of lanthanum hydroxide and magnesium hydroxide to form a multi-scale synergistic flame retardant system of "adsorption - endothermic - oxygen isolation - carbonization", significantly enhancing the high-efficiency and continuous flame retardant performance of polyester.

Specific Embodiments

[0029] The following provides specific embodiments of a polyester industrial yarn containing a rare earth flame retardant of the present invention.

[0030] Example 1

[0031] A polyester industrial yarn containing a rare earth flame retardant, the raw materials of which mainly include a rare earth flame retardant, and the mass fraction of the rare earth flame retardant in the polyester industrial yarn is 6.6%.

[0032] The rare earth flame retardant is a composite of a porous carbon aerogel.

[0033] The components of the rare earth flame retardant mainly include a porous carbon aerogel and lanthanum hydroxide.

[0034] A preparation method of a rare earth flame retardant, the specific steps of which are:

[0035] (1) Pretreatment of porous carbon aerogel: The porous carbon aerogel can be immersed in a 4% nitric acid solution for 1 - 2 hours, and then washed with deionized water to obtain a solution of the pretreated porous carbon aerogel;

[0036] To enhance the binding force between the porous carbon aerogel and the hydroxides, this step improves the surface polarity of the porous carbon aerogel by introducing oxygen-containing groups (such as -COOH, -OH), promoting the interfacial interaction with lanthanum hydroxide and magnesium hydroxide;

[0037] (2) Rare earth suspension: Take lanthanum hydroxide (La(OH)3) and magnesium hydroxide (Mg(OH)2) powders and mix them to obtain a mixed powder. Add the mixed powder to deionized water and ultrasonically disperse for 30 minutes to obtain a suspension with a concentration of 15 mg / mL of the mixed powder;

[0038] The mass ratio of lanthanum hydroxide (La(OH)3) to magnesium hydroxide is 1:0.9;

[0039] The mass ratio of the porous carbon aerogel to lanthanum hydroxide is 2:0.9;

[0040] (3) Mix the solution of the pretreated porous carbon aerogel in step (1) and the suspension in step (2), and stir or ultrasonically treat at room temperature for 1 - 3 hours to promote the uniform adsorption of lanthanum hydroxide and magnesium hydroxide particles on the pore surface of the porous carbon aerogel;

[0041] (4) Filter the mixed solution in step (3) with filter paper or a microporous membrane to separate the loaded porous carbon aerogel; wash it repeatedly with deionized water 3 - 5 times to remove unadsorbed hydroxide particles and dispersant residues, obtaining the washed porous carbon aerogel;

[0042] (5) Place the washed porous carbon aerogel in step (4) in a vacuum drying oven and dry it at 60 ± 2 °C for 48 ± 1 hour to obtain a rare earth flame retardant, which is the composite of the porous carbon aerogel; the porous structure of the porous carbon aerogel can be retained.

[0043] A preparation method of a polyester industrial yarn containing a rare earth flame retardant. After mixing the rare earth flame retardant and polyester chips, melt extrusion is carried out, and then melt spinning is carried out to obtain the polyester industrial yarn.

[0044] The temperature of the melt spinning is 240 - 270 °C, and the spinning speed is 2800 ± 50 m / min; when cooling, the cooling temperature is 20 ± 0.5 °C, the humidity is 75 ± 3%, and the cooling air speed is 0.5 m / s; the stretching is divided into pre-stretching and main stretching. The multiple of the pre-stretching is 1 time, and the multiple of the main stretching is 3 times.

[0045] The limiting oxygen index of the polyester industrial yarn in this Example 1 is 28.2%.

[0046] The polyester industrial yarn of Example 1 was placed at 50°C for 240 hours, and its limiting oxygen index was 26.7%, which decreased by about 5%.

[0047] Example 2

[0048] A polyester industrial yarn containing a rare earth flame retardant, the raw materials of which mainly include a rare earth flame retardant, and the mass fraction of the rare earth flame retardant in the polyester industrial yarn is 7.6%.

[0049] The rare earth flame retardant is a composite of porous carbon aerogel.

[0050] The components of the rare earth flame retardant mainly contain porous carbon aerogel and lanthanum hydroxide.

[0051] A preparation method of a rare earth flame retardant, the specific steps are as follows:

[0052] (1) Pretreatment of porous carbon aerogel: The porous carbon aerogel can be soaked in a 4% nitric acid solution for 1-2 hours, and then washed with deionized water to obtain a solution of pretreated porous carbon aerogel;

[0053] In order to improve the binding force between the porous carbon aerogel and the hydroxide, this step improves the surface polarity of the porous carbon aerogel by introducing oxygen-containing groups (such as -COOH, -OH) to promote the interfacial interaction with lanthanum hydroxide and magnesium hydroxide;

[0054] (2) Rare earth suspension: Take lanthanum hydroxide (La(OH)3) and magnesium hydroxide (Mg(OH)2) powders and mix them to obtain a mixed powder. Add the mixed powder to deionized water and ultrasonically disperse it for 30 minutes to obtain a suspension with a concentration of 15 mg / mL of the mixed powder;

[0055] The mass ratio of lanthanum hydroxide (La(OH)3) to magnesium hydroxide is 1:1;

[0056] The mass ratio of porous carbon aerogel to lanthanum hydroxide is 2:1;

[0057] (3) Mix the solution of pretreated porous carbon aerogel in step (1) and the suspension in step (2), and stir or ultrasonically treat it at room temperature for 1-3 hours to promote the uniform adsorption of lanthanum hydroxide and magnesium hydroxide particles on the pore surface of the porous carbon aerogel;

[0058] (4) Filter the mixed solution in step (3) with filter paper or microporous filter membrane to separate the loaded porous carbon aerogel; wash it repeatedly with deionized water 3-5 times to remove unadsorbed hydroxide particles and dispersant residues, and obtain the washed porous carbon aerogel;

[0059] (5) Place the washed porous carbon aerogel in step (4) in a vacuum drying oven and dry it at 60 ± 2 °C for 48 ± 1 hour to obtain a rare earth flame retardant, which is a composite of the porous carbon aerogel; the porous structure of the porous carbon aerogel can be retained.

[0060] A method for preparing a polyester industrial yarn containing a rare earth flame retardant is the same as in Example 1.

[0061] The limiting oxygen index of the polyester industrial yarn of this Example 2 is 29.0%.

[0062] The polyester industrial yarn of this Example 2 was placed at 50 °C for 240 hours, and the limiting oxygen index was 28.2%, a decrease of about 3%.

[0063] Example 3

[0064] A polyester industrial yarn containing a rare earth flame retardant, the raw materials of which mainly include a rare earth flame retardant, and the mass fraction of the rare earth flame retardant in the polyester industrial yarn is 8.6%.

[0065] The rare earth flame retardant is a composite of the porous carbon aerogel.

[0066] The components of the rare earth flame retardant mainly contain porous carbon aerogel and lanthanum hydroxide.

[0067] A method for preparing a rare earth flame retardant, the specific steps are as follows:

[0068] (1) Pretreatment of the porous carbon aerogel: The porous carbon aerogel can be soaked in a 4% nitric acid solution for 1 - 2 hours, and then washed with deionized water to obtain a solution of the pretreated porous carbon aerogel;

[0069] To enhance the binding force between the porous carbon aerogel and the hydroxide, this step improves the surface polarity of the porous carbon aerogel by introducing oxygen-containing groups (such as -COOH, -OH) to promote the interfacial interaction with lanthanum hydroxide and magnesium hydroxide;

[0070] (2) Rare earth suspension: Take lanthanum hydroxide (La(OH)3) and magnesium hydroxide (Mg(OH)2) powders, mix them to obtain a mixed powder, add the mixed powder to deionized water, and ultrasonically disperse for 30 minutes to obtain a suspension with a concentration of 15 mg / mL of the mixed powder;

[0071] The mass ratio of lanthanum hydroxide (La(OH)3) to magnesium hydroxide is 1:1.1;

[0072] The mass ratio of the porous carbon aerogel to lanthanum hydroxide is 2:1.2;

[0073] (3) Mix the solution of the pretreated porous carbon aerogel in step (1) and the suspension in step (2), and stir or ultrasonically treat at room temperature for 1 to 3 hours to promote the uniform adsorption of lanthanum hydroxide and magnesium hydroxide particles on the pore surface of the porous carbon aerogel;

[0074] (4) Filter the mixed solution in step (3) with filter paper or microporous filter membrane to separate the loaded porous carbon aerogel; wash it repeatedly with deionized water 3 to 5 times to remove the unadsorbed hydroxide particles and the residue of the dispersant, and obtain the washed porous carbon aerogel;

[0075] (5) Place the washed porous carbon aerogel in step (4) in a vacuum drying oven and dry it at 60 ± 2 °C for 48 ± 1 hour to obtain the rare earth flame retardant, which is the composite of the porous carbon aerogel; the porous structure of the porous carbon aerogel can be retained.

[0076] A method for preparing a polyester industrial yarn containing a rare earth flame retardant is the same as that in Example 1.

[0077] The limiting oxygen index of the polyester industrial yarn in this Example 3 is 29.9%.

[0078] The polyester industrial yarn in this Example 3 is placed at 50 °C for 240 hours, and the limiting oxygen index is 29.3%, which decreases by about 2%.

[0079] Comparative Example 1

[0080] A polyester industrial yarn containing a rare earth flame retardant, whose raw materials mainly include the rare earth flame retardant, and the mass fraction of the rare earth flame retardant in the polyester industrial yarn is 7.6%.

[0081] A method for preparing a rare earth flame retardant, the specific steps are as follows:

[0082] (1) Pretreatment of porous carbon aerogel: The porous carbon aerogel can be soaked in a 4% nitric acid solution for 1 to 2 hours, and then washed with deionized water to obtain the solution of the pretreated porous carbon aerogel;

[0083] (2) Rare earth suspension: Add magnesium hydroxide (Mg(OH)2) to deionized water and ultrasonically disperse for 30 minutes to obtain a suspension with a concentration of 15 mg / mL;

[0084] The mass ratio of the porous carbon aerogel to magnesium hydroxide is 2:1;

[0085] (3) Mix the solution of the pretreated porous carbon aerogel in step (1) and the suspension in step (2), and stir or ultrasonically treat at room temperature for 1 to 3 hours to promote the uniform adsorption of magnesium hydroxide particles on the pore surface of the porous carbon aerogel;

[0086] (4) Filter the mixed solution in step (3) with filter paper or a microporous filter membrane to separate the loaded porous carbon aerogel; wash it repeatedly with deionized water 3 to 5 times to remove unadsorbed hydroxide particles and dispersant residues, and obtain the washed porous carbon aerogel;

[0087] (5) Place the washed porous carbon aerogel in step (4) in a vacuum drying oven and dry it at 60 ± 2 °C for 48 ± 1 hour to obtain the rare earth flame retardant, which is the composite of the porous carbon aerogel; the porous structure of the porous carbon aerogel can be retained.

[0088] The preparation method of a polyester industrial yarn containing a rare earth flame retardant is the same as that in Example 1.

[0089] The limiting oxygen index of the polyester industrial yarn of this Comparative Example 1 is 21.5%.

[0090] The polyester industrial yarn of this Comparative Example 1 was placed at 50 °C for 240 hours, and the limiting oxygen index was 19.7%, a decrease of about 9%.

[0091] Comparative Example 2

[0092] A polyester industrial yarn containing a rare earth flame retardant, the raw materials of which mainly include a rare earth flame retardant, and the mass fraction of the rare earth flame retardant in the polyester industrial yarn is 7.6%.

[0093] A preparation method of a rare earth flame retardant, the specific steps of which are:

[0094] (1) Pretreatment of the porous carbon aerogel: The porous carbon aerogel can be soaked in a 4% nitric acid solution for 1 to 2 hours, and then washed with deionized water to obtain a solution of the pretreated porous carbon aerogel;

[0095] (2) Rare earth suspension: Add lanthanum hydroxide (La(OH)3) powder to deionized water and ultrasonically disperse it for 30 minutes to obtain a suspension with a mixed powder concentration of 15 mg / mL;

[0096] The mass ratio of the porous carbon aerogel to lanthanum hydroxide is 2:1;

[0097] (3) Mix the solution of the pretreated porous carbon aerogel in step (1) and the suspension in step (2), and stir or ultrasonically treat it at room temperature for 1 to 3 hours to promote the uniform adsorption of lanthanum hydroxide particles on the pore surface of the porous carbon aerogel;

[0098] (4) Filter the mixed solution in step (3) with filter paper or a microporous filter membrane to separate the loaded porous carbon aerogel; wash it repeatedly with deionized water 3 to 5 times to remove unadsorbed hydroxide particles and dispersant residues, and obtain the washed porous carbon aerogel;

[0099] (5) Place the washed porous carbon aerogel from step (4) in a vacuum drying oven and dry it at 60 ± 2 °C for 48 ± 1 hour to obtain a rare earth flame retardant, which is a composite of the porous carbon aerogel; the porous structure of the porous carbon aerogel can be retained.

[0100] A method for preparing a polyester industrial yarn containing a rare earth flame retardant is the same as in Example 1.

[0101] The limiting oxygen index of the polyester industrial yarn of this Comparative Example 2 is 23.1%.

[0102] The polyester industrial yarn of this Comparative Example 2 was placed at 50 °C for 240 hours, and the limiting oxygen index was 22.4%, a decrease of about 7%.

[0103] Comparative Example 3

[0104] A polyester industrial yarn containing a rare earth flame retardant, the raw materials of which mainly include a rare earth flame retardant, and the mass fraction of the rare earth flame retardant in the polyester industrial yarn is 7.6%.

[0105] The rare earth flame retardant is a composite of a porous carbon aerogel.

[0106] The components of the rare earth flame retardant mainly include a porous carbon aerogel and lanthanum hydroxide.

[0107] A method for preparing a rare earth flame retardant, the specific steps are as follows:

[0108] (1) Pretreatment of the porous carbon aerogel: The porous carbon aerogel can be soaked in a 4% nitric acid solution for 1 - 2 hours, and then washed with deionized water to obtain a solution of the pretreated porous carbon aerogel;

[0109] (2) Rare earth suspension: Take lanthanum hydroxide (La(OH)3) and magnesium hydroxide (Mg(OH)2) powders and mix them to obtain a mixed powder. Add the mixed powder to deionized water and ultrasonically disperse it for 30 minutes to obtain a suspension with a concentration of the mixed powder of 15 mg / mL;

[0110] The mass ratio of lanthanum hydroxide (La(OH)3) to magnesium hydroxide is 1:1;

[0111] The mass ratio of the porous carbon aerogel to lanthanum hydroxide is 2.5:1;

[0112] (3) Mix the solution of the pretreated porous carbon aerogel from step (1) and the suspension from step (2), and stir or ultrasonically treat it at room temperature for 1 - 3 hours to promote the uniform adsorption of lanthanum hydroxide and magnesium hydroxide particles on the pore surface of the porous carbon aerogel;

[0113] (4) Filter the mixed solution in step (3) with filter paper or a microporous filter membrane to separate the loaded porous carbon aerogel; wash it 3 - 5 times repeatedly with deionized water to remove the unadsorbed hydroxide particles and the residue of the dispersant, and obtain the washed porous carbon aerogel;

[0114] (5) Place the washed porous carbon aerogel in step (4) in a vacuum drying oven and dry it at 60 ± 2 °C for 48 ± 1 hour to obtain the rare earth flame retardant, which is the composite of the porous carbon aerogel; the porous structure of the porous carbon aerogel can be retained.

[0115] A preparation method of polyester industrial yarn containing rare earth flame retardant is the same as that in Example 1.

[0116] The limiting oxygen index of the polyester industrial yarn in this Comparative Example 3 is 23.4%.

[0117] The polyester industrial yarn in this Comparative Example 3 is placed at 50 °C for 240 hours, and the limiting oxygen index is 22%, which has decreased by about 6%.

[0118] Comparative Example 4

[0119] A polyester industrial yarn containing rare earth flame retardant, whose raw materials mainly include rare earth flame retardant, and the mass fraction of the rare earth flame retardant in the polyester industrial yarn is 7.6%.

[0120] The rare earth flame retardant is a composite of porous carbon aerogel.

[0121] The components of the rare earth flame retardant mainly include porous carbon aerogel and lanthanum hydroxide.

[0122] A preparation method of rare earth flame retardant, the specific steps are as follows:

[0123] (1) Pretreatment of porous carbon aerogel: The porous carbon aerogel can be soaked in a 4% nitric acid solution for 1 - 2 hours, and then washed with deionized water to obtain the solution of the pretreated porous carbon aerogel;

[0124] (2) Rare earth suspension: Take lanthanum hydroxide (La(OH)3) and magnesium hydroxide (Mg(OH)2) powders and mix them to obtain a mixed powder. Add the mixed powder into deionized water and disperse it ultrasonically for 30 minutes to obtain a suspension with a concentration of 15 mg / mL of the mixed powder;

[0125] The mass ratio of lanthanum hydroxide (La(OH)3) to magnesium hydroxide is 1:1;

[0126] The mass ratio of porous carbon aerogel to lanthanum hydroxide is 3:1;

[0127] (3) Mix the solution of the pretreated porous carbon aerogel in step (1) with the suspension in step (2), and stir or ultrasonically treat at room temperature for 1 - 3 hours to promote the uniform adsorption of lanthanum hydroxide and magnesium hydroxide particles on the pore surface of the porous carbon aerogel;

[0128] (4) Filter the mixed solution in step (3) with filter paper or microporous membrane to separate the loaded porous carbon aerogel; wash it repeatedly with deionized water 3 - 5 times to remove the unadsorbed hydroxide particles and dispersant residues, and obtain the washed porous carbon aerogel;

[0129] (5) Place the washed porous carbon aerogel in step (4) in a vacuum drying oven and dry it at 60 ± 2 °C for 48 ± 1 hour to obtain the rare earth flame retardant, which is the composite of the porous carbon aerogel; the porous structure of the porous carbon aerogel can be retained.

[0130] A method for preparing a polyester industrial yarn containing a rare earth flame retardant is the same as that in Example 1.

[0131] The limiting oxygen index of the polyester industrial yarn in this Comparative Example 4 is 22.2%.

[0132] The polyester industrial yarn in this Comparative Example 4 is placed at 50 °C for 240 hours, and the limiting oxygen index is 20.7%, which has decreased by about 7%.

[0133] 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 concept of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. A polyester industrial yarn containing a rare earth flame retardant, characterized in that, Its raw materials mainly include rare earth flame retardants, and the mass fraction of rare earth flame retardants in polyester industrial yarn is 6-9%. The initial limiting oxygen index of polyester industrial yarn is L1; After the polyester industrial yarn is placed at 50 °C for 240 hours and then tested, its limiting oxygen index is L2; The decrease rate of the limiting oxygen index is within 5.5%; The decrease rate of the limiting oxygen index = [(L1 - L2) / L1] * 100%.

2. The polyester industrial yarn containing rare earth flame retardant according to claim 1, characterized in that, The mass fraction of rare earth flame retardants in polyester industrial yarn is 7-8%.

3. The polyester industrial yarn containing rare earth flame retardant according to claim 1, characterized in that, The rare earth flame retardant is a composite of porous carbon aerogel.

4. The polyester industrial yarn containing a rare earth flame retardant according to claim 1, characterized in that, The components of the rare earth flame retardant mainly contain porous carbon aerogel and lanthanum hydroxide.

5. A polyester industrial yarn containing a rare earth flame retardant as described in claim 1, characterized in that, The preparation method of the rare earth flame retardant, the specific steps are as follows: (1) Pretreatment of porous carbon aerogel: The porous carbon aerogel can be soaked in a 3-5% nitric acid solution for 1-2 hours, and then washed with deionized water to obtain a solution of pretreated porous carbon aerogel; (2) Rare earth suspension: Take lanthanum hydroxide (La(OH)3) and magnesium hydroxide (Mg(OH)2) powders and mix them to obtain a mixed powder. Add the mixed powder to deionized water and disperse it ultrasonically for 30 minutes to obtain a suspension with a concentration of 10-20 mg / mL of the mixed powder; (3) Mix the solution of pretreated porous carbon aerogel in step (1) and the suspension in step (2), and stir or ultrasonically treat it at room temperature for 1-3 hours to promote the uniform adsorption of lanthanum hydroxide and magnesium hydroxide particles on the pore surface of the porous carbon aerogel; (4) Filter the mixed solution in step (3) with filter paper or microporous membrane to separate the loaded porous carbon aerogel; wash it repeatedly with deionized water 3-5 times to remove unadsorbed hydroxide particles and dispersant residues; obtain the washed porous carbon aerogel; (5) Place the washed porous carbon aerogel in step (4) in a vacuum drying oven and dry it at 60 ± 2 °C for 48 ± 1 hour to obtain the rare earth flame retardant, which is a composite of porous carbon aerogel.

6. The polyester industrial yarn containing rare earth flame retardant according to claim 1, wherein The mass ratio of lanthanum hydroxide (La(OH)3) to magnesium hydroxide is 1:0.9 - 1:1.

1.

7. The polyester industrial yarn containing rare earth flame retardant according to claim 1, characterized in that, The mass ratio of lanthanum hydroxide (La(OH)3) to magnesium hydroxide is 1:

1.

8. The polyester industrial yarn containing a rare earth flame retardant according to claim 1, characterized in that, The mass ratio of porous carbon aerogel to lanthanum hydroxide is 2:0.9 - 2:1.

2.

9. A polyester industrial yarn containing a rare earth flame retardant as described in claim 1, characterized in that, The mass ratio of porous carbon aerogel to lanthanum hydroxide is 2:

1.

10. A polyester industrial yarn containing a rare earth flame retardant according to claim 1, characterized in that, The decrease rate of the limiting oxygen index of polyester industrial yarn is within 5%.