Heat-insulating flame-retardant outer-layer fabric for fire-fighting heat-insulating clothes and preparation method thereof

Abstract

The invention discloses a heat-insulating flame-retardant outer-layer fabric for fire-fighting heat-insulating clothes and a preparation method of the heat-insulating flame-retardant outer-layer fabric, and belongs to the technical field of fabrics. The heat-insulating flame-retardant outer-layer fabric for the fire-fighting heat-insulating clothes is characterized in that the outer-layer fabric comprises an aramid fabric layer, an adhesive layer and an aluminum laminated film layer; the adhesive layer is prepared from the following raw materials in parts by weight: 30 to 40 parts of boron modified phenolic resin, 20 to 30 parts of polyimide, 2 to 7 parts of silicate adhesive, 5 to 10 parts of nano filler, 3 to 8 parts of flame retardant and 40 to 60 parts of solvent. The bonding effect of the aluminum laminated film and the aramid fabric layer at high temperature is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fabrics, and in particular to a heat-insulating and flame-retardant outer layer fabric for fire-fighting heat-insulating clothing and a preparation method thereof. Background Art

[0002] Thermal insulation clothing is protective clothing worn by firefighters and high-temperature workers when working near fire. It has the characteristics of fire prevention, heat insulation, wear resistance, folding resistance, flame retardancy, and radiation protection. The thermal insulation principle of thermal insulation clothing is that when heat is transferred from high temperature to low temperature, the temperature change amplitude per unit space becomes smaller due to the change of the conduction medium, thereby blocking the physical process of heat conduction.

[0003] Thermal insulation clothing is usually composed of multiple layers of fabric, including an outer layer, an insulating layer and a comfortable layer. The outer layer of the thermal insulation clothing is usually a composite material of aluminum film and fiber, the second layer is an insulating layer, and the inner layer is a comfortable flame retardant layer. The outer layer is a material composite of aluminum film and fiber, which has good heat radiation performance and can effectively reflect 95% of heat radiation; and the preparation of the outer layer material is usually to bond the fiber and the aluminum film together with glue. The glue is prone to melting or aging under long-term high-temperature baking, causing the aluminum film to separate from the fiber layer, resulting in the composite of aluminum film and fiber being difficult to achieve a high bonding effect and high temperature resistance, which makes it difficult for the outer layer material to achieve an ideal reflection efficiency. Summary of the invention

[0004] In order to improve the bonding effect between the aluminized film and the aramid fabric layer at high temperature, the present invention provides a heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing and a preparation method thereof.

[0005] The first aspect of the present invention provides a heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing, adopting the following technical scheme: a heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing, the outer fabric comprising an aramid fabric layer, an adhesive layer and an aluminum-plated film layer, the raw materials used for the adhesive layer comprising, by weight: 30-40 parts of boron-modified phenolic resin, 20-30 parts of polyimide, 2-7 parts of silicate adhesive, 5-10 parts of nanofiller, 3-8 parts of flame retardant, and 40-60 parts of solvent.

[0006] Preferably, the boron-modified phenolic resin is a boron-modified phenolic resin modified with organosilicon.

[0007] Preferably, the method for treating the organosilicon-modified boron-modified phenolic resin comprises the following steps: S1. Mix the crosslinking agent with ethanol and water in a weight ratio of 1:(2-3):(0.4-0.6), stir at room temperature for 25-30 minutes, and then let stand for 25-30 minutes; S2, dissolving the boron-modified phenolic resin with DMF; S3, adding the material obtained in step S1 to the boron-modified phenolic resin solution obtained in step S2, stirring and mixing, and keeping warm at 50-65° C. for 24 hours to obtain a modified boron-modified phenolic resin, wherein the amount of the silane coupling agent is 1-3% by weight of the boron-modified phenolic resin.

[0008] Preferably, the nanofiller is nano-silicon dioxide modified by silane.

[0009] Preferably, the treatment method of silane-modified nano-silica comprises the following steps: mixing nano-silica and acetone in a weight ratio of 1:1, then adding γ-aminopropyltriethoxysilane at 5% of the weight of the nano-silica, adjusting the pH to 5-6 with acetic acid, heating in an oil bath at 55-65°C with stirring for 5.5-6.5h, filtering after the reaction is completed, then washing and filtering with acetone, and finally drying at 100°C to obtain modified nano-silica.

[0010] Preferably, the flame retardant is a cyclic phosphate ester.

[0011] Preferably, the silicate adhesive is obtained by the following preparation method: sodium silicate powder with a weight ratio of 1:(3-5) is placed in water, and stirred at 75-85° C. until completely dissolved to obtain the silicate adhesive.

[0012] Preferably, the solvent is N,N-dimethylformamide.

[0013] The second aspect of the present invention provides a method for preparing the above-mentioned heat-insulating flame-retardant outer fabric of the fire-fighting heat-insulating clothing, comprising the following steps: stirring and mixing the raw materials used for the adhesive layer, applying them to the aramid fabric layer, bonding them with the aluminized film, and then drying to obtain the heat-insulating flame-retardant outer fabric, wherein the wet coating amount of the adhesive is 120-150g / m 2 .

[0014] In summary, the present invention has the following beneficial effects: In the present application, the combination of boron-modified phenolic resin with polyimide, silicate adhesive, nanofiller and flame retardant can effectively improve the adhesion between the adhesive layer and the aramid fiber and the aluminized film. At the same time, the combination of boron-modified phenolic resin, nanofiller and flame retardant can also greatly improve the heat resistance of the adhesive layer, thereby reducing the separation of the adhesive layer from the aramid fabric layer and the aluminized film layer at high temperatures, and improving the flame retardant properties of the outer fabric for fire fighting. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below with reference to the embodiments.

[0016] The raw materials used in this application are all commercially available.

[0017] Example 1 A method for preparing a heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing comprises the following steps: Preparation of adhesive: 30 kg of boron-modified phenolic resin, 20 kg of polyimide, 2 kg of silicate adhesive, 5 kg of nano-silicon dioxide, 3 kg of cyclic phosphate, and 40 kg of N,N-dimethylformamide were mixed to obtain an adhesive; The silicate adhesive is prepared by the following method: sodium silicate powder with a weight ratio of 1:3 is placed in water, and stirred at 75°C until it is completely dissolved to obtain the silicate adhesive; The adhesive was applied to the aramid fabric layer and then bonded to the aluminized film. The outer layer was dried at 150°C for 90 seconds to obtain a heat-insulating flame-retardant outer layer. The wet coating amount of the adhesive was 120 g / m 2 .

[0018] Example 2 A method for preparing a heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing comprises the following steps: Preparation of adhesive: 35 kg of boron-modified phenolic resin, 25 kg of polyimide, 5 kg of silicate adhesive, 8 kg of nano-silicon dioxide, 5 kg of cyclic phosphate, and 50 kg of N,N-dimethylformamide were mixed to obtain an adhesive; The silicate adhesive is prepared by the following method: sodium silicate powder with a weight ratio of 1:4 is placed in water, and stirred at 80° C. until it is completely dissolved to obtain the silicate adhesive; The adhesive was applied to the aramid fabric layer and then bonded to the aluminized film. The outer layer was dried at 150°C for 90 seconds to obtain a heat-insulating flame-retardant outer layer. The wet coating amount of the adhesive was 120 g / m 2 .

[0019] Example 3 A method for preparing a heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing comprises the following steps: Preparation of adhesive: 40 kg of boron-modified phenolic resin, 30 kg of polyimide, 7 kg of silicate adhesive, 10 kg of nano-silicon dioxide, 8 kg of cyclic phosphate, and 60 kg of N,N-dimethylformamide were mixed to obtain an adhesive; The silicate adhesive is prepared by the following method: sodium silicate powder with a weight ratio of 1:5 is placed in water, and stirred at 85°C until it is completely dissolved to obtain the silicate adhesive; The adhesive was applied to the aramid fabric layer and then bonded to the aluminized film. The outer layer was dried at 150°C for 90 seconds to obtain a heat-insulating flame-retardant outer layer. The wet coating amount of the adhesive was 120 g / m 2 .

[0020] Example 4 A method for preparing a heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing comprises the following steps: Preparation of adhesive: 35 kg of boron-modified phenolic resin, 25 kg of polyimide, 5 kg of silicate adhesive, 8 kg of nano-silicon dioxide, 5 kg of cyclic phosphate, and 50 kg of N,N-dimethylformamide were mixed to obtain an adhesive; The boron-modified phenolic resin is a boron-modified phenolic resin modified by organosilicon, and the method for treating the organosilicon-modified boron-modified phenolic resin comprises the following steps: S1. Mix 3-aminopropyltriethoxysilane with ethanol and water in a weight ratio of 1:2:0.4, stir at room temperature for 25 minutes, and then let stand for 2 minutes; S2, dissolving the boron-modified phenolic resin with DMF, dissolving 35 kg of the boron-modified phenolic resin in 30 kg of DMF; S3, adding the material obtained in step S1 to the boron-modified phenolic resin solution obtained in step S2, stirring and mixing, and keeping the mixture at 50° C. for 24 h to obtain a modified boron-modified phenolic resin, wherein the amount of 3-aminopropyltriethoxysilane is 1% by weight of the boron-modified phenolic resin, i.e., the amount of 3-aminopropyltriethoxysilane is 0.35 kg; The silicate adhesive is obtained by the following preparation method: sodium silicate powder with a weight ratio of 1:4 is placed in water, and stirred at 80° C. until it is completely dissolved to obtain the silicate adhesive; The adhesive was applied to the aramid fabric layer and then bonded to the aluminized film. The outer layer was dried at 150°C for 90 seconds to obtain a heat-insulating flame-retardant outer layer. The wet coating amount of the adhesive was 120 g / m 2 .

[0021] Example 5 A method for preparing a heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing comprises the following steps: Preparation of adhesive: 35 kg of boron-modified phenolic resin, 25 kg of polyimide, 5 kg of silicate adhesive, 8 kg of nano-silicon dioxide, 5 kg of cyclic phosphate, and 50 kg of N,N-dimethylformamide were mixed to obtain an adhesive; The boron-modified phenolic resin is a boron-modified phenolic resin modified by organosilicon, and the method for treating the organosilicon-modified boron-modified phenolic resin comprises the following steps: S1. Mix 3-aminopropyltriethoxysilane with ethanol and water in a weight ratio of 1:3:0.6, stir at room temperature for 30 minutes, and then let stand for 30 minutes; S2, dissolving the boron-modified phenolic resin with DMF, dissolving 35 kg of the boron-modified phenolic resin in 30 kg of DMF; S3, adding the material obtained in step S1 to the boron-modified phenolic resin solution obtained in step S2, stirring and mixing, and keeping the mixture at 60° C. for 24 h to obtain a modified boron-modified phenolic resin, wherein the amount of 3-aminopropyltriethoxysilane is 2% of the weight of the boron-modified phenolic resin, that is, the amount of 3-aminopropyltriethoxysilane is 0.7 kg; The silicate adhesive is obtained by the following preparation method: sodium silicate powder with a weight ratio of 1:4 is placed in water, and stirred at 80° C. until it is completely dissolved to obtain the silicate adhesive; The adhesive was applied to the aramid fabric layer and then bonded to the aluminized film. The outer layer was dried at 150°C for 90 seconds to obtain a heat-insulating flame-retardant outer layer. The wet coating amount of the adhesive was 120 g / m 2 .

[0022] Example 6 A method for preparing a heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing comprises the following steps: Preparation of adhesive: 35 kg of boron-modified phenolic resin, 25 kg of polyimide, 5 kg of silicate adhesive, 8 kg of nano-silicon dioxide, 5 kg of cyclic phosphate, and 50 kg of N,N-dimethylformamide were mixed to obtain an adhesive; The boron-modified phenolic resin is a boron-modified phenolic resin modified by organosilicon, and the method for treating the organosilicon-modified boron-modified phenolic resin comprises the following steps: S1. Mix 3-aminopropyltriethoxysilane with ethanol and water in a weight ratio of 1:3:0.5, stir at room temperature for 30 minutes, and then let stand for 30 minutes; S2, dissolving the boron-modified phenolic resin with DMF, dissolving 35 kg of the boron-modified phenolic resin in 30 kg of DMF; S3, adding the material obtained in step S1 to the boron-modified phenolic resin solution obtained in step S2, stirring and mixing, and keeping the mixture at 65° C. for 24 h to obtain a modified boron-modified phenolic resin, wherein the amount of 3-aminopropyltriethoxysilane is 3% of the weight of the boron-modified phenolic resin, that is, the amount of 3-aminopropyltriethoxysilane is 1.05 kg; The silicate adhesive is obtained by the following preparation method: sodium silicate powder with a weight ratio of 1:4 is placed in water, and stirred at 80° C. until it is completely dissolved to obtain the silicate adhesive; The adhesive was applied to the aramid fabric layer and then bonded to the aluminized film. The outer layer was dried at 150°C for 90 seconds to obtain a heat-insulating flame-retardant outer layer. The wet coating amount of the adhesive was 120 g / m 2 .

[0023] Example 7 A method for preparing a heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing comprises the following steps: Preparation of adhesive: 35 kg of boron-modified phenolic resin, 25 kg of polyimide, 5 kg of silicate adhesive, 8 kg of nano-silicon dioxide, 5 kg of cyclic phosphate, and 50 kg of N,N-dimethylformamide were mixed to obtain an adhesive; The nano-silica is nano-silica modified by silane, and the treatment method of the silane-modified nano-silica comprises the following steps: mixing nano-silica and acetone in a weight ratio of 1:1, then adding γ-aminopropyltriethoxysilane in an amount of 5% by weight of the nano-silica, adjusting the pH to 5 with acetic acid, heating in an oil bath at 55° C. with stirring for 5.5 hours, filtering after the reaction is completed, then washing and filtering with acetone, and finally drying at 100° C. to obtain modified nano-silica; The silicate adhesive is obtained by the following preparation method: sodium silicate powder with a weight ratio of 1:4 is placed in water, and stirred at 80° C. until it is completely dissolved to obtain the silicate adhesive; The adhesive was applied to the aramid fabric layer and then bonded to the aluminized film. The outer layer was dried at 150°C for 90 seconds to obtain a heat-insulating flame-retardant outer layer. The wet coating amount of the adhesive was 120 g / m 2 .

[0024] Example 8 A method for preparing a heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing comprises the following steps: Preparation of adhesive: 35 kg of boron-modified phenolic resin, 25 kg of polyimide, 5 kg of silicate adhesive, 8 kg of nano-silicon dioxide, 5 kg of cyclic phosphate, and 50 kg of N,N-dimethylformamide were mixed to obtain an adhesive; The nano-silica is nano-silica modified by silane, and the treatment method of the silane-modified nano-silica comprises the following steps: mixing nano-silica and acetone in a weight ratio of 1:1, then adding γ-aminopropyltriethoxysilane in an amount of 5% by weight of the nano-silica, adjusting the pH to 6 with acetic acid, heating in an oil bath at 65° C. with stirring for 6.5 hours, filtering after the reaction is completed, then washing and filtering with acetone, and finally drying at 100° C. to obtain modified nano-silica; The silicate adhesive is obtained by the following preparation method: sodium silicate powder with a weight ratio of 1:4 is placed in water, and stirred at 80° C. until it is completely dissolved to obtain the silicate adhesive; The adhesive was applied to the aramid fabric layer and then bonded to the aluminized film. The outer layer was dried at 150°C for 90 seconds to obtain a heat-insulating flame-retardant outer layer. The wet coating amount of the adhesive was 120 g / m 2 .

[0025] Example 9 A method for preparing a heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing comprises the following steps: Preparation of adhesive: 35 kg of boron-modified phenolic resin, 25 kg of polyimide, 5 kg of silicate adhesive, 8 kg of nano-silicon dioxide, 5 kg of cyclic phosphate, and 50 kg of N,N-dimethylformamide were mixed to obtain an adhesive; The boron-modified phenolic resin is a boron-modified phenolic resin modified by organosilicon, and the method for treating the organosilicon-modified boron-modified phenolic resin comprises the following steps: S1. Mix 3-aminopropyltriethoxysilane with ethanol and water in a weight ratio of 1:3:0.6, stir at room temperature for 30 minutes, and then let stand for 30 minutes; S2, dissolving the boron-modified phenolic resin with DMF, dissolving 35 kg of the boron-modified phenolic resin in 30 kg of DMF; S3, adding the material obtained in step S1 to the boron-modified phenolic resin solution obtained in step S2, stirring and mixing, and keeping the mixture at 60° C. for 24 h to obtain a modified boron-modified phenolic resin, wherein the amount of 3-aminopropyltriethoxysilane is 2% of the weight of the boron-modified phenolic resin, that is, the amount of 3-aminopropyltriethoxysilane is 0.7 kg; The nano-silica is nano-silica modified by silane, and the treatment method of the silane-modified nano-silica comprises the following steps: mixing nano-silica and acetone in a weight ratio of 1:1, then adding γ-aminopropyltriethoxysilane in an amount of 5% by weight of the nano-silica, adjusting the pH to 6 with acetic acid, heating in an oil bath at 65° C. with stirring for 6.5 hours, filtering after the reaction is completed, then washing and filtering with acetone, and finally drying at 100° C. to obtain modified nano-silica; The silicate adhesive is obtained by the following preparation method: sodium silicate powder with a weight ratio of 1:4 is placed in water, and stirred at 80° C. until it is completely dissolved to obtain the silicate adhesive; The adhesive was applied to the aramid fabric layer and then bonded to the aluminized film. The outer layer was dried at 150°C for 90 seconds to obtain a heat-insulating flame-retardant outer layer. The wet coating amount of the adhesive was 120 g / m 2 .

[0026] Example 10 A method for preparing a heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing, which is different from Example 9 in that the wet coating amount of the adhesive is 140 g / m 2 .

[0027] Embodiment 11 A method for preparing a heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing, which is different from Example 9 in that the wet coating amount of the adhesive is 150 g / m2 .

[0028] Comparative Example 1 A method for preparing a heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing, which is different from Example 2 in that an equal amount of phenolic resin is used instead of boron-modified phenolic resin, and the rest is the same as Example 2.

[0029] Comparative Example 2 A method for preparing a heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing, which is different from Example 2 in that there is no silicate adhesive in the raw materials of the adhesive layer, and the rest is the same as Example 2.

[0030] Comparative Example 3 A method for preparing a heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing, which is different from Example 2 in that there is no nano-silicon dioxide in the raw material of the adhesive layer, and the rest is the same as Example 2.

[0031] Performance Testing The outer fabrics obtained in the above examples and comparative examples were tested for the bonding performance between the aramid fabric layer and the aluminum-plated film layer, as well as the thermal stability, thermal protection and flame retardancy of the outer fabric as a whole. The test results are shown in Table 1.

[0032] The thermal stability performance test is carried out in accordance with Appendix B of GA10-2014 "Firefighters' Firefighting Protective Clothing". The sample size is 200×200mm and is placed at 260±5℃ for 10 minutes. The sample size is measured within 2 minutes after being taken out and the size change rate is calculated. The peel strength between the heated aramid fabric layer and the aluminized film layer is also tested.

[0033] The flame retardant performance test is carried out in accordance with GB / T5455-2014 "Determination of vertical damage length, smoldering and afterflaming time of textile combustion performance", and the afterflaming time, damage length and dripping of the fabric are measured.

[0034] The peel strength test is carried out in accordance with the relevant provisions of the national standard GB / T7124-2008 "Determination of tensile shear strength of adhesives" and the peel strength is tested under constant temperature and humidity conditions of 25°C and 50-60% relative humidity.

[0035] The bending resistance is tested in accordance with the provisions of Appendix B of XF 634-2015 "Thermal Insulation Protective Clothing for Firefighters", and the radiant heat resistance is tested in accordance with the provisions of Appendix C of XF 634-2015 "Thermal Insulation Protective Clothing for Firefighters", mainly testing the time for the inner surface temperature to reach 24°C.

[0036] Table 1 Outer fabric test results From the table above we can see that: The outer fabric obtained in Examples 1-3 of the present application has good thermal stability, bending resistance, radiation heat resistance and flame retardant properties. At the same time, the peel strength between the aramid fabric layer and the aluminum-plated film layer of the present application is above 14N / 30mm, and after treatment at 260±5°C, the peel strength between the aramid fabric layer and the aluminum-plated film layer is still above 14N / 30mm. It can be seen that the adhesive of the present application can effectively improve the bonding performance between the aramid fabric layer and the aluminum-plated film layer, thereby effectively improving the flame retardant properties of the outer fabric.

[0037] Compared with Example 2, when the boron-modified phenolic resin is modified with a silane coupling agent, the thermal stability, bending resistance, radiation heat resistance and flame retardancy of the outer fabric obtained in Example 4-6 are improved compared with those in Example 2, and the peel strength between the aramid fabric layer and the aluminum-plated film layer is improved compared with that in Example 2. It can be seen that after the boron-modified phenolic resin is modified, the adhesion performance of the adhesive at high temperature can be further improved.

[0038] Compared with Example 2, when the nano-silica is modified with a silane coupling agent, the thermal stability, bending resistance, radiation heat resistance and flame retardancy of the outer fabric obtained in Examples 7-8 are improved compared with those in Example 2, and the peel strength between the aramid fabric layer and the aluminum-plated film layer is improved compared with that in Example 2. It can be seen that after the nano-silica is modified, the adhesion performance of the adhesive at high temperature can be further improved, thereby ensuring the heat resistance and flame retardancy of the outer fabric.

[0039] Compared with Example 2, when the boron-modified phenolic resin and nano-silica are modified by a silane coupling agent, the thermal stability, bending resistance, radiation heat resistance, flame retardancy of the outer fabric obtained in Example 9 and the peel strength between the aramid fiber and the aluminum-plated film are greatly improved. It can be seen that the combined use of the modified boron-modified phenolic resin and nano-silica can further improve the thermal insulation and flame retardancy of the outer fabric.

[0040] Compared with Example 2, when an equal amount of phenolic resin is used in the adhesive raw material to replace the boron-modified phenolic resin or there is no silicate adhesive in the raw material or there is no nano-silica in the raw material, the thermal stability, bending resistance, radiation heat resistance, flame retardancy of the outer layer fabric obtained in Comparative Examples 1-3 and the peel strength between the aramid fiber and the aluminum-plated film are all reduced. It can be seen that the combined use of the raw materials in the adhesive of the present application can effectively improve the thermal insulation and flame retardancy of the outer layer fabric.

[0041] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing, characterized in that: The outer fabric layer includes an aramid fabric layer, an adhesive layer and an aluminum-plated film layer. The raw materials used for the adhesive layer include, by weight: 30-40 parts of boron-modified phenolic resin, 20-30 parts of polyimide, 2-7 parts of silicate adhesive, 5-10 parts of nano filler, 3-8 parts of flame retardant, and 40-60 parts of solvent.

2. The heat-insulating and flame-retardant outer fabric of fire-fighting heat-insulating clothing according to claim 1, characterized in that: The boron-modified phenolic resin is a boron-modified phenolic resin that has been modified with organosilicon.

3. The heat-insulating and flame-retardant outer fabric of fire-fighting heat-insulating clothing according to claim 2, characterized in that: The method for treating the organosilicon-modified boron-modified phenolic resin comprises the following steps: S1. Mix the crosslinking agent with ethanol and water in a weight ratio of 1: (2-3): (0.4-0.6), stir at room temperature for 25-30 minutes, and then let stand for 25-30 minutes; S2, dissolving the boron-modified phenolic resin with DMF; S3, adding the material obtained in step S1 to the boron-modified phenolic resin solution obtained in step S2, stirring and mixing, and keeping warm at 50-65° C. for 24 hours to obtain a modified boron-modified phenolic resin, wherein the amount of the silane coupling agent is 1-3% by weight of the boron-modified phenolic resin.

4. The heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing according to claim 1, characterized in that: The nano filler is nano silicon dioxide modified by silane.

5. The heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing according to claim 4, characterized in that: The treatment method of silane-modified nano-silica comprises the following steps: mixing nano-silica and acetone at a weight ratio of 1:1, then adding γ-aminopropyltriethoxysilane at a weight ratio of 5% of the nano-silica, adjusting the pH to 5-6 with acetic acid, heating in an oil bath at 55-65° C. with stirring for 5.5-6.5 hours, filtering after the reaction is completed, then washing and filtering with acetone, and finally drying at 100° C. to obtain modified nano-silica.

6. The heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing according to claim 1, characterized in that: The flame retardant is a cyclic phosphate ester.

7. The heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing according to claim 1, characterized in that: The silicate adhesive is obtained by the following preparation method: sodium silicate powder with a weight ratio of 1: (3-5) is placed in water, and stirred at 75-85° C. until it is completely dissolved to obtain the silicate adhesive.

8. The heat-insulating and flame-retardant outer fabric for fire-fighting heat-insulating clothing according to claim 1, characterized in that: The solvent is N,N-dimethylformamide.

9. A method for preparing the heat-insulating and flame-retardant outer fabric of fire-fighting heat-insulating clothing according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: mixing the raw materials used for the adhesive layer, applying the mixture to the aramid fabric layer, bonding the mixture to the aluminized film, and drying the mixture to obtain a heat-insulating and flame-retardant outer fabric layer, wherein the wet coating amount of the adhesive is 120-150 g / m 2 .

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