阅读说明：本技术 一种高阻燃弹性无纺布 (High-flame-retardant elastic non-woven fabric ) 是由 胡杰 于 2020-09-15 设计创作，主要内容包括：本发明公开了一种高阻燃弹性无纺布,涉及纺织材料技术领域。本发明先将活化碳纳米管超声分散于甲醇溶液中,并加入六水合硝酸钴,制得混合分散液,然后将2,5-二羟基对苯二甲酸和纳米氧化钴分散于甲醇溶液中,制得氧化钴混合分散液,将混合分散液与氧化钴混合分散液混合后,再加入2-硝基咪唑,搅拌混合,过滤,干燥,并置于二氧化碳氛围中处理,得改性金属有机骨架材料,最后将改性金属有机骨架材料和氢氧化镁加入熔融的聚氨酯切片中,挤出纺丝,制得高阻燃弹性无纺布。本发明制备的高阻燃弹性无纺布具有优异的阻燃效果,且力学性能明显提高。(The invention discloses a high-flame-retardance elastic non-woven fabric, and relates to the technical field of textile materials. The preparation method comprises the steps of firstly ultrasonically dispersing activated carbon nanotubes in a methanol solution, adding cobalt nitrate hexahydrate to prepare a mixed dispersion solution, then dispersing 2, 5-dihydroxyterephthalic acid and nano cobalt oxide in the methanol solution to prepare a cobalt oxide mixed dispersion solution, mixing the mixed dispersion solution with the cobalt oxide mixed dispersion solution, then adding 2-nitroimidazole, stirring and mixing, filtering, drying, placing in a carbon dioxide atmosphere for treatment to obtain a modified metal organic framework material, finally adding the modified metal organic framework material and magnesium hydroxide into a molten polyurethane slice, and extruding and spinning to obtain the high-flame-retardant elastic non-woven fabric. The high-flame-retardant elastic non-woven fabric prepared by the invention has excellent flame-retardant effect and obviously improved mechanical property.)

1. A high flame-retardant elastic non-woven fabric is characterized in that: the adhesive mainly comprises the following components in parts by weight: 60 parts of polyurethane slice G83, 6 parts of modified metal organic framework material and 1 part of magnesium hydroxide;

the preparation method of the non-woven fabric comprises the following preparation steps:

(1) mixing the activated carbon nanotube with methanol according to a mass ratio of 1:100, adding polyvinylpyrrolidone with the mass 6 times of that of the activated carbon nano tube into the beaker, performing ultrasonic dispersion for 40min under the condition of the frequency of 45kHz, adding cobalt nitrate hexahydrate with the mass 4 times of that of the activated carbon nano tube into the beaker, and stirring and mixing to obtain a mixed dispersion liquid;

(2) mixing 2, 5-dihydroxy terephthalic acid and 70% methanol aqueous solution according to a mass ratio of 1: 80, adding nano cobalt oxide with the mass 1.5 times of that of the 2, 5-dihydroxy terephthalic acid into the flask, and stirring and mixing for 40min under the condition that the rotating speed is 1000r/min to obtain cobalt oxide mixed dispersion liquid;

(3) mixing the cobalt oxide mixed dispersion liquid obtained in the step (2) with the mixed dispersion liquid obtained in the step (1) according to a mass ratio of 1: 1.5, mixing the mixture in a stirrer, stirring and mixing the mixture for 12 hours, adding 2-nitroimidazole of which the mass is 0.2 time that of the mixed dispersion liquid into the stirrer, stirring and mixing the mixture for 20 hours, filtering the mixture to obtain a filter cake, drying the filter cake in vacuum at the temperature of 105 ℃ for 5 hours, and placing the filter cake in a carbon dioxide atmosphere for 20 hours to obtain a modified metal organic framework material;

(4) heating and melting the polyurethane slice G83, adding the modified metal organic framework material obtained in the step (2) with the mass of 0.1 time of that of the polyurethane slice G83 and magnesium hydroxide with the mass of 0.15 time of that of the polyurethane slice G83 into the molten polyurethane slice G83, stirring and mixing to obtain a spinning material, and extruding and spinning the spinning material to obtain the high-flame-retardant elastic non-woven fabric;

(5) performing quality analysis on the high-flame-retardant elastic non-woven fabric obtained in the step (4);

the preparation method of the activated carbon nano tube in the step (1) comprises the following steps of mixing the carbon nano tube with mixed concentrated acid according to the mass ratio of 1: 40, mixing, stirring and reacting for 4 hours, filtering to obtain a pretreated carbon nano tube, and washing the pretreated carbon nano tube with deionized water for 8 times to obtain an activated carbon nano tube; the mixed concentrated acid is prepared by mixing nitric acid with a mass fraction of 68% and sulfuric acid with a mass fraction of 75% according to a volume ratio of 3: 1, mixing to obtain mixed concentrated acid;

the extrusion spinning process conditions of the step (4) are that the aperture of a spinning hole is 0.3mm, the pressure of hot air is 0.48MPa, and the receiving distance is 20 cm.

Technical Field

The invention relates to the technical field of textile materials, in particular to a high-flame-retardant elastic non-woven fabric.

Background

The nonwoven fabric is made of chemical fibers, plant fibers and the like on a wet or dry paper machine under the condition of using water or air as a suspension medium, and is called as a nonwoven fabric although the nonwoven fabric is a cloth and is not woven. The non-woven fabric is a new-generation environment-friendly material, and has the advantages of good strength, air permeability, water resistance, environmental friendliness, flexibility, no toxicity, no odor, low price and the like. The non-woven fabric product has the advantages of rich color, brightness, fashion, environmental protection, wide application, elegant appearance, various patterns and styles, light weight, environmental protection and recycling, and is internationally recognized as an environmental protection product for protecting the earth ecology. The product is suitable for industries such as agricultural films, shoemaking, leather making, mattresses, primary and secondary quilts, decoration, chemical engineering, printing, automobiles, building materials, furniture and the like, and industries such as clothing linings, medical and sanitary disposable operating gowns, masks, hats, bed sheets, hotel disposable tablecloths, beauty treatment, saunas and even modern fashionable gift bags, fine product bags, shopping bags, advertising bags and the like. Environmental protection product, wide application, economy and practicality.

However, when the non-woven fabric on the market is used, the non-woven fabric has no flame retardant property and poor elasticity, and a product made of the non-woven fabric is not three-dimensional and has no shape, so that the appearance of the product is not beautiful. Meanwhile, the non-woven fabric has no flame retardance, so that potential safety hazards are large in the using process.

Disclosure of Invention

The invention aims to provide a high-flame-retardant elastic non-woven fabric and a preparation method thereof, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a high flame-retardant elastic non-woven fabric is characterized by mainly comprising the following raw material components in parts by weight: 40-80 parts of polyurethane slices, 5-8 parts of modified metal organic framework materials and 1-2 parts of hydroxides.

As optimization, the polyurethane slices are polyurethane slices G83; the hydroxide is any one of magnesium hydroxide or aluminum hydroxide.

As optimization, the modified metal organic framework material is prepared from cobalt nitrate hexahydrate, an activated carbon nanotube, 2-nitroimidazole, 2, 5-dihydroxyterephthalic acid and nano cobalt oxide; the activated carbon nanotube is prepared by acidifying a carbon nanotube with nitric acid and sulfuric acid.

As optimization, the high-flame-retardant elastic non-woven fabric mainly comprises the following raw material components in parts by weight: 60 parts of polyurethane chip G83, 6 parts of modified metal organic framework material and 1 part of magnesium hydroxide.

As optimization, the production method of the high-flame-retardant elastic non-woven fabric mainly comprises the following preparation steps:

(1) ultrasonically dispersing the activated carbon nano tube in a methanol solution, adding cobalt nitrate hexahydrate, and stirring and mixing to obtain a mixed dispersion liquid;

(2) dispersing 2, 5-dihydroxy terephthalic acid in a methanol solution, adding nano cobalt oxide, stirring and mixing to obtain a cobalt oxide mixed dispersion liquid;

(3) mixing the cobalt oxide mixed dispersion liquid obtained in the step (2) with the mixed dispersion liquid obtained in the step (1), stirring and mixing, then adding 2-nitroimidazole, stirring and mixing, filtering, drying, and placing in a carbon dioxide atmosphere for treatment to obtain a modified metal organic framework material;

(4) heating and melting polyurethane slices, adding the modified metal organic framework material obtained in the step (2) and hydroxide, stirring and mixing to obtain a spinning material, and extruding and spinning the spinning material to obtain a high-flame-retardant elastic non-woven fabric;

(5) and (4) carrying out quality analysis on the high-flame-retardant elastic non-woven fabric obtained in the step (4).

As optimization, the production method of the high-flame-retardant elastic non-woven fabric mainly comprises the following preparation steps:

(1) mixing the activated carbon nanotube with methanol according to a mass ratio of 1: 100-1: 120, mixing the mixture in a beaker, adding polyvinylpyrrolidone with the mass 6-8 times that of the activated carbon nano tube into the beaker, performing ultrasonic dispersion for 40-60 min under the condition of the frequency of 45kHz, adding cobalt nitrate hexahydrate with the mass 3-5 times that of the activated carbon nano tube into the beaker, and stirring and mixing to obtain a mixed dispersion liquid;

(2) mixing 2, 5-dihydroxy terephthalic acid and 70% methanol aqueous solution according to a mass ratio of 1: mixing the raw materials in a ratio of 80-1: 100 in a flask, adding nano cobalt oxide with the mass being 1-3 times that of 2, 5-dihydroxy terephthalic acid into the flask, stirring and mixing for 30-40 min under the condition that the rotating speed is 800-1000 r/min to obtain a cobalt oxide mixed dispersion liquid;

(3) mixing the cobalt oxide mixed dispersion liquid obtained in the step (2) with the mixed dispersion liquid obtained in the step (1) according to a mass ratio of 1: 1.5-1: 2, mixing the mixture in a stirrer, stirring and mixing for 12 hours, adding 2-nitroimidazole with the mass of 0.1-0.3 time of that of the mixed dispersion liquid into the stirrer, stirring and mixing for 20-24 hours, filtering to obtain a filter cake, drying the filter cake in vacuum at the temperature of 100-110 ℃ for 5 hours, and placing in a carbon dioxide atmosphere for 20 hours to obtain the modified metal organic framework material;

(4) heating and melting a polyurethane slice, adding the modified metal organic framework material obtained in the step (2) with the mass of 0.1 time of that of the polyurethane slice and magnesium hydroxide with the mass of 0.15-0.17 time of that of the polyurethane slice into the molten polyurethane slice, stirring and mixing to obtain a spinning material, and extruding and spinning the spinning material to obtain the high-flame-retardant elastic non-woven fabric;

(5) and (4) carrying out quality analysis on the high-flame-retardant elastic non-woven fabric obtained in the step (4).

As optimization, the preparation method of the activated carbon nanotube in the step (1) comprises the following steps of mixing the carbon nanotube with mixed concentrated acid according to a mass ratio of 1: 40, mixing, stirring and reacting for 4 hours, filtering to obtain a pretreated carbon nano tube, and washing the pretreated carbon nano tube for 6-8 times by using deionized water to obtain an activated carbon nano tube; the mixed concentrated acid is prepared by mixing nitric acid with a mass fraction of 68% and sulfuric acid with a mass fraction of 75% according to a volume ratio of 3: 1, mixing to obtain mixed concentrated acid.

And (4) as optimization, the extrusion spinning process conditions in the step (4) are that the aperture of a spinning hole is 0.3-0.4 mm, the pressure of hot air is 0.4-0.5 MPa, and the receiving distance is 15-25 cm.

Compared with the prior art, the invention has the beneficial effects that:

the invention uses polyurethane slice G83 as raw material when preparing high flame-retardant elastic non-woven fabric, and adds modified metal organic framework material in spinning material.

Firstly, the polyurethane slice G83 is used as the raw material of the non-woven fabric, so that the non-woven fabric prepared by the invention has excellent elasticity and good mechanical property, thereby widening the application range of the high flame-retardant elastic non-woven fabric prepared by the invention; secondly, the modified metal organic framework material is added into the spinning material, the modified metal organic framework material contains the carbon nano tube, the carbon nano tube has good flame retardant effect, and after treatment, the metal organic framework material is adsorbed on the surface of the carbon nano tube; meanwhile, due to the existence of the metal organic framework material on the surface of the carbon nano tube, the carbon nano tube can be uniformly distributed in the non-woven fabric fiber, so that the flame retardant property and the mechanical strength of the product are further improved; moreover, the modified metal organic framework material has certain carbon dioxide adsorption capacity, so when the metal organic framework shrinks at a high temperature, carbon dioxide can be released, and the flame retardant property of the product is further improved.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to more clearly illustrate the method provided by the present invention, the following examples are given, and the method for testing the indexes of the high flame-retardant elastic nonwoven fabric manufactured in the following examples is as follows:

mechanical properties: the high flame-retardant elastic nonwoven fabrics obtained in the examples and the comparative products were cut into samples of 5cm × 20cm, and the breaking strength and the breaking elongation were measured by a universal tensile tester.

Flame retardant property: the high flame-retardant elastic nonwoven fabric obtained in each example and the comparative example were tested for limiting oxygen index.

Example 1

A high flame-retardant elastic non-woven fabric mainly comprises the following components in parts by weight: 60 parts of polyurethane chip G83, 6 parts of modified metal organic framework material and 1 part of magnesium hydroxide.

A preparation method of a high-flame-retardant elastic non-woven fabric mainly comprises the following preparation steps:

(1) mixing the activated carbon nanotube with methanol according to a mass ratio of 1:100, adding polyvinylpyrrolidone with the mass 6 times of that of the activated carbon nano tube into the beaker, performing ultrasonic dispersion for 40min under the condition of the frequency of 45kHz, adding cobalt nitrate hexahydrate with the mass 4 times of that of the activated carbon nano tube into the beaker, and stirring and mixing to obtain a mixed dispersion liquid;

(2) mixing 2, 5-dihydroxy terephthalic acid and 70% methanol aqueous solution according to a mass ratio of 1: 80, adding nano cobalt oxide with the mass 1.5 times of that of the 2, 5-dihydroxy terephthalic acid into the flask, and stirring and mixing for 40min under the condition that the rotating speed is 1000r/min to obtain cobalt oxide mixed dispersion liquid;

(3) mixing the cobalt oxide mixed dispersion liquid obtained in the step (2) with the mixed dispersion liquid obtained in the step (1) according to a mass ratio of 1: 1.5, mixing the mixture in a stirrer, stirring and mixing the mixture for 12 hours, adding 2-nitroimidazole of which the mass is 0.2 time that of the mixed dispersion liquid into the stirrer, stirring and mixing the mixture for 20 hours, filtering the mixture to obtain a filter cake, drying the filter cake in vacuum at the temperature of 105 ℃ for 5 hours, and placing the filter cake in a carbon dioxide atmosphere for 20 hours to obtain a modified metal organic framework material;

(4) heating and melting the polyurethane slice G83, adding the modified metal organic framework material obtained in the step (2) with the mass of 0.1 time of that of the polyurethane slice G83 and magnesium hydroxide with the mass of 0.15 time of that of the polyurethane slice G83 into the molten polyurethane slice G83, stirring and mixing to obtain a spinning material, and extruding and spinning the spinning material to obtain the high-flame-retardant elastic non-woven fabric;

(5) and (4) carrying out quality analysis on the high-flame-retardant elastic non-woven fabric obtained in the step (4).

As optimization, the preparation method of the activated carbon nanotube in the step (1) comprises the following steps of mixing the carbon nanotube with mixed concentrated acid according to a mass ratio of 1: 40, mixing, stirring and reacting for 4 hours, filtering to obtain a pretreated carbon nano tube, and washing the pretreated carbon nano tube with deionized water for 8 times to obtain an activated carbon nano tube; the mixed concentrated acid is prepared by mixing nitric acid with a mass fraction of 68% and sulfuric acid with a mass fraction of 75% according to a volume ratio of 3: 1, mixing to obtain mixed concentrated acid.

And (4) as optimization, the extrusion spinning process conditions of the step (4) are that the aperture of a spinning hole is 0.3mm, the pressure of hot air is 0.48MPa, and the receiving distance is 20 cm.

Example 2

A high flame-retardant elastic non-woven fabric mainly comprises the following components in parts by weight: 60 parts of polyurethane chip G83, 6 parts of modified metal organic framework material and 1 part of magnesium hydroxide.

A preparation method of a high-flame-retardant elastic non-woven fabric mainly comprises the following preparation steps:

(1) mixing the activated carbon nanotube with methanol according to a mass ratio of 1:100, adding polyvinylpyrrolidone with the mass 6 times of that of the activated carbon nano tube into the beaker, performing ultrasonic dispersion for 40min under the condition of the frequency of 45kHz, adding cobalt nitrate hexahydrate with the mass 4 times of that of the activated carbon nano tube into the beaker, and stirring and mixing to obtain a mixed dispersion liquid;

(2) mixing water and methanol according to a mass ratio of 3: 7, mixing the mixture in a flask, adding nano cobalt oxide with the mass of 0.5 time of that of water into the flask, and stirring and mixing for 40min under the condition that the rotating speed is 1000r/min to obtain cobalt oxide mixed dispersion liquid;

(3) mixing the cobalt oxide mixed dispersion liquid obtained in the step (2) with the mixed dispersion liquid obtained in the step (1) according to a mass ratio of 1: 1.5, mixing the mixture in a stirrer, stirring and mixing the mixture for 12 hours, adding 2-nitroimidazole of which the mass is 0.2 time that of the mixed dispersion liquid into the stirrer, stirring and mixing the mixture for 20 hours, filtering the mixture to obtain a filter cake, drying the filter cake in vacuum at the temperature of 105 ℃ for 5 hours, and placing the filter cake in a carbon dioxide atmosphere for 20 hours to obtain a modified metal organic framework material;

(4) heating and melting the polyurethane slice G83, adding the modified metal organic framework material obtained in the step (2) with the mass of 0.1 time of that of the polyurethane slice G83 and magnesium hydroxide with the mass of 0.15 time of that of the polyurethane slice G83 into the molten polyurethane slice G83, stirring and mixing to obtain a spinning material, and extruding and spinning the spinning material to obtain the high-flame-retardant elastic non-woven fabric;

(5) and (4) carrying out quality analysis on the high-flame-retardant elastic non-woven fabric obtained in the step (4).

As optimization, the preparation method of the activated carbon nanotube in the step (1) comprises the following steps of mixing the carbon nanotube with mixed concentrated acid according to a mass ratio of 1: 40, mixing, stirring and reacting for 4 hours, filtering to obtain a pretreated carbon nano tube, and washing the pretreated carbon nano tube with deionized water for 8 times to obtain an activated carbon nano tube; the mixed concentrated acid is prepared by mixing nitric acid with a mass fraction of 68% and sulfuric acid with a mass fraction of 75% according to a volume ratio of 3: 1, mixing to obtain mixed concentrated acid.

And (4) as optimization, the extrusion spinning process conditions of the step (4) are that the aperture of a spinning hole is 0.3mm, the pressure of hot air is 0.48MPa, and the receiving distance is 20 cm.

Example 3

A high flame-retardant elastic non-woven fabric mainly comprises the following components in parts by weight: 60 parts of polyurethane chip G83, 6 parts of modified metal organic framework material and 1 part of magnesium hydroxide.

A preparation method of a high-flame-retardant elastic non-woven fabric mainly comprises the following preparation steps:

(1) mixing cobalt nitrate hexahydrate and methanol according to a mass ratio of 1: 25, mixing the mixture in a beaker, adding polyvinylpyrrolidone with the mass of 1.5 times of that of the activated carbon nano tube into the beaker, and performing ultrasonic dispersion for 40min under the condition of the frequency of 45kHz to obtain a mixed dispersion liquid;

(2) mixing 2, 5-dihydroxy terephthalic acid and 70% methanol aqueous solution according to a mass ratio of 1: 80, adding nano cobalt oxide with the mass 1.5 times of that of the 2, 5-dihydroxy terephthalic acid into the flask, and stirring and mixing for 40min under the condition that the rotating speed is 1000r/min to obtain cobalt oxide mixed dispersion liquid;

(3) mixing the cobalt oxide mixed dispersion liquid obtained in the step (2) with the mixed dispersion liquid obtained in the step (1) according to a mass ratio of 1: 1.5, mixing the mixture in a stirrer, stirring and mixing the mixture for 12 hours, adding 2-nitroimidazole of which the mass is 0.2 time that of the mixed dispersion liquid into the stirrer, stirring and mixing the mixture for 20 hours, filtering the mixture to obtain a filter cake, drying the filter cake in vacuum at the temperature of 105 ℃ for 5 hours, and placing the filter cake in a carbon dioxide atmosphere for 20 hours to obtain a modified metal organic framework material;

(4) heating and melting the polyurethane slice G83, adding the modified metal organic framework material obtained in the step (2) with the mass of 0.1 time of that of the polyurethane slice G83 and magnesium hydroxide with the mass of 0.15 time of that of the polyurethane slice G83 into the molten polyurethane slice G83, stirring and mixing to obtain a spinning material, and extruding and spinning the spinning material to obtain the high-flame-retardant elastic non-woven fabric;

(5) and (4) carrying out quality analysis on the high-flame-retardant elastic non-woven fabric obtained in the step (4).

As optimization, the preparation method of the activated carbon nanotube in the step (1) comprises the following steps of mixing the carbon nanotube with mixed concentrated acid according to a mass ratio of 1: 40, mixing, stirring and reacting for 4 hours, filtering to obtain a pretreated carbon nano tube, and washing the pretreated carbon nano tube with deionized water for 8 times to obtain an activated carbon nano tube; the mixed concentrated acid is prepared by mixing nitric acid with a mass fraction of 68% and sulfuric acid with a mass fraction of 75% according to a volume ratio of 3: 1, mixing to obtain mixed concentrated acid.

And (4) as optimization, the extrusion spinning process conditions of the step (4) are that the aperture of a spinning hole is 0.3mm, the pressure of hot air is 0.48MPa, and the receiving distance is 20 cm.

Comparative example 1

A high flame-retardant elastic non-woven fabric mainly comprises the following components in parts by weight: 60 parts of polyurethane chip G83, 6 parts of modified metal organic framework material and 1 part of magnesium hydroxide.

A preparation method of a high-flame-retardant elastic non-woven fabric mainly comprises the following preparation steps:

(1) mixing cobalt nitrate hexahydrate and methanol according to a mass ratio of 1: 25, mixing the mixture in a beaker, adding polyvinylpyrrolidone with the mass of 1.5 times of that of the activated carbon nano tube into the beaker, and performing ultrasonic dispersion for 40min under the condition of the frequency of 45kHz to obtain a mixed dispersion liquid;

(2) mixing water and methanol according to a mass ratio of 3: 7, mixing the mixture in a flask, adding nano cobalt oxide with the mass of 0.5 time of that of water into the flask, and stirring and mixing for 40min under the condition that the rotating speed is 1000r/min to obtain cobalt oxide mixed dispersion liquid;

(3) mixing the cobalt oxide mixed dispersion liquid obtained in the step (2) with the mixed dispersion liquid obtained in the step (1) according to a mass ratio of 1: 1.5, mixing the mixture in a stirrer, stirring and mixing the mixture for 12 hours, adding 2-nitroimidazole of which the mass is 0.2 time that of the mixed dispersion liquid into the stirrer, stirring and mixing the mixture for 20 hours, filtering the mixture to obtain a filter cake, drying the filter cake in vacuum at the temperature of 105 ℃ for 5 hours, and placing the filter cake in a carbon dioxide atmosphere for 20 hours to obtain a modified metal organic framework material;

(4) heating and melting the polyurethane slice G83, adding the modified metal organic framework material obtained in the step (2) with the mass of 0.1 time of that of the polyurethane slice G83 and magnesium hydroxide with the mass of 0.15 time of that of the polyurethane slice G83 into the molten polyurethane slice G83, stirring and mixing to obtain a spinning material, and extruding and spinning the spinning material to obtain the high-flame-retardant elastic non-woven fabric;

(5) and (4) carrying out quality analysis on the high-flame-retardant elastic non-woven fabric obtained in the step (4).

As optimization, the preparation method of the activated carbon nanotube in the step (1) comprises the following steps of mixing the carbon nanotube with mixed concentrated acid according to a mass ratio of 1: 40, mixing, stirring and reacting for 4 hours, filtering to obtain a pretreated carbon nano tube, and washing the pretreated carbon nano tube with deionized water for 8 times to obtain an activated carbon nano tube; the mixed concentrated acid is prepared by mixing nitric acid with a mass fraction of 68% and sulfuric acid with a mass fraction of 75% according to a volume ratio of 3: 1, mixing to obtain mixed concentrated acid.

And (4) as optimization, the extrusion spinning process conditions of the step (4) are that the aperture of a spinning hole is 0.3mm, the pressure of hot air is 0.48MPa, and the receiving distance is 20 cm.

Comparative example 2

A high flame-retardant elastic non-woven fabric mainly comprises the following components in parts by weight: 60 parts of polyurethane chip G83 and 1 part of magnesium hydroxide.

A preparation method of a high-flame-retardant elastic non-woven fabric mainly comprises the following preparation steps:

(1) heating and melting the polyurethane slice G83, adding magnesium hydroxide with the mass of 0.15 time of that of the polyurethane slice G83 into the molten polyurethane slice G83, stirring and mixing to obtain a spinning material, and extruding and spinning the spinning material to obtain a high-flame-retardant elastic non-woven fabric;

(2) and (3) carrying out quality analysis on the high-flame-retardant elastic non-woven fabric obtained in the step (1).

Examples of effects

Table 1 below gives the results of performance analysis of the high flame-retardant elastic nonwoven fabrics using examples 1 to 3 of the present invention and comparative examples 1 and 2.

TABLE 1

	Breaking strength (N)	Elongation at Break (%)	Limiting oxygen index (%)
				Example 1	28.6	447	38.9
Example 2	26.3	451	30.9
				Example 3	19.2	457	25.3
Comparative example 1	18.9	482	22.4
				Comparative example 2	13.6	498	18.6

From the comparison of the experimental data of example 1 and comparative examples 1 and 2 in table 1, it can be found that the mechanical properties of the product can be effectively improved by adding the modified metal organic framework material when preparing the high flame-retardant elastic non-woven fabric, and the product has excellent flame-retardant properties. From the comparison of the experimental data of the embodiment 1 and the embodiment 2, it can be found that when the 2-nitroimidazole is added in the preparation of the modified metal organic framework material, the flame retardant property of the product can be effectively improved, because the 2-nitroimidazole is added to enrich the framework of the metal organic framework material and reduce the thermal conductivity of the metal organic framework material, so that carbon dioxide gas can be effectively stored in the preparation of the product, and the flame retardant property of the product can be improved; from the comparison of the experimental data of example 1 and example 3, it can be seen that when activated carbon nanotubes are not added to the modified metal organic framework material, the mechanical properties and flame retardant properties of the product are greatly reduced, because when the activated carbon nanotubes disappear, the shrinkage of the metal organic framework material at high temperature cannot form a complete barrier layer, thereby greatly reducing the flame retardant properties of the product.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.