阅读说明：本技术 一种悬垂感好的抗紫外线面料及其制备方法 (Ultraviolet-resistant fabric with good draping feeling and preparation method thereof ) 是由 崔永珍 于 2021-09-14 设计创作，主要内容包括：本发明公开了一种悬垂感好的抗紫外线面料及其制备方法,该抗紫外线面料包括如下重量份原料：二苯甲烷二异氰酸酯30-50份、聚甲基丙烯酸甲酯60-70份、聚丙烯树脂30-35份、对甲酚8-15份、竹纤维10-15份、紫外线吸收剂3-5份、脂肪酸甘油酯3-5份；该紫外线吸收剂分子内存在氢键螯合环,在吸收紫外线后,氢键被破坏,将紫外光能转化热能释放,且在受到光照后分子内的氮原子与羟基上的氢之间形成的分子内氢键会发生断裂,而使化合物达到不稳定的高能状态,处于高能状态的紫外线吸收剂通过释放热量回到低能状态,再次形成氢键,且受阻酚的存在使得布料的抗紫外线效果进一步提升。(The invention discloses an anti-ultraviolet fabric with good drapability and a preparation method thereof, wherein the anti-ultraviolet fabric comprises the following raw materials in parts by weight: 30-50 parts of diphenylmethane diisocyanate, 60-70 parts of polymethyl methacrylate, 30-35 parts of polypropylene resin, 8-15 parts of p-cresol, 10-15 parts of bamboo fiber, 3-5 parts of an ultraviolet absorbent and 3-5 parts of fatty glyceride; there is hydrogen bond chelate ring in this ultraviolet absorbent molecule, after absorbing ultraviolet, the hydrogen bond is destroyed, with ultraviolet light energy conversion heat energy release, and the intramolecular hydrogen bond that forms between the hydrogen on the nitrogen atom in receiving illumination back molecule and the hydroxyl can break off, and makes the compound reach unstable high energy state, and the ultraviolet absorbent that is in high energy state gets back to the low energy state through the release heat, forms the hydrogen bond once more, and the existence of hindered phenol makes the ultraviolet resistance effect of cloth further promote.)

1. An uvioresistant fabric with good draping feeling is characterized in that: the feed comprises the following raw materials in parts by weight: 30-50 parts of diphenylmethane diisocyanate, 60-70 parts of polymethyl methacrylate, 30-35 parts of polypropylene resin, 8-15 parts of p-cresol, 10-15 parts of bamboo fiber, 3-5 parts of an ultraviolet absorbent and 3-5 parts of fatty glyceride;

step S1: adding diphenylmethane diisocyanate, polymethyl methacrylate, polypropylene resin and p-cresol into a stirring kettle, mixing and heating to be molten under the condition that the rotating speed is 300-500r/min, adding bamboo fiber and an ultraviolet absorbent, and continuously stirring for 3-5h to prepare a molten material;

and step S2, extruding the molten material from a spinneret plate with the diameter of 0.01-0.015mm to prepare base fibers, and weaving the base fibers according to the warp density of 50-60 pieces/cm and the weft density of 40-45 pieces/cm to prepare the ultraviolet-resistant fabric.

2. The ultraviolet-resistant fabric with good draping feeling of claim 1, wherein: the ultraviolet absorbent is prepared by the following steps:

step A1, adding m-methylphenol and sodium hydroxide solution into a reaction kettle, stirring and adding dimethyl sulfate under the conditions of the rotation speed of 150-;

step A2: adding deionized water and concentrated hydrochloric acid into a reaction kettle, stirring and adding o-nitroaniline under the condition that the rotation speed is 200-80 ℃ and 300r/min, cooling to 0-2 ℃ after the o-nitroaniline is completely dissolved, adding sodium nitrite, reacting for 4-6h to obtain a diazo solution, adding sodium carbonate, p-aminophenol and the diazo solution into the reaction kettle, stirring for 10-15min under the conditions that the rotation speed is 200-300r/min and the temperature is 0-2 ℃, adjusting the pH value of the mixed solution to 10-11, and continuing to react for 1.5-2h to obtain an intermediate 3;

step A3, adding deionized water and sodium hydroxide into a reaction kettle, stirring and adding the intermediate 3 prepared in the step A2 under the condition that the rotating speed is 500-600r/min, adding thiourea dioxide at the temperature of 70-75 ℃ for 20-30min, and reacting for 4-6h at the temperature of 80-90 ℃ after the addition is finished to prepare an intermediate 4;

step A4: adding the intermediate 2, tetrahydrofuran and deionized water prepared in the step A1 into a reaction kettle, stirring and refluxing at the rotation speed of 200-120 ℃ and potassium permanganate at the temperature of 100-120 ℃, continuing to react for 4-5h to prepare an intermediate 5, adding the intermediate 5, 3, 5-di-tert-butyl-4-hydroxybenzyl alcohol and tetrahydrofuran into the reaction kettle, stirring at the rotation speed of 150-200r/min and adding concentrated sulfuric acid, reacting at the temperature of 90-100 ℃ for 1-2h to prepare an intermediate 6, adding the intermediate 6, the intermediate 4, dimethyl sulfoxide and 1-hydroxybenzotriazole into the reaction kettle, reacting at the rotation speed of 120-150r/min and the temperature of 25-30 ℃ for 5-8h, removing dimethyl sulfoxide to obtain ultraviolet absorbent.

3. The ultraviolet-resistant fabric with good draping feeling of claim 2, wherein: the dosage ratio of the m-methyl phenol, the sodium hydroxide solution and the dimethyl sulfate in the step A1 is 5g:70mL:36.2g, the mass fraction of the sodium hydroxide solution is 15%, and the dosage ratio of the intermediate 1, the aluminum trichloride, the dichloroethane, the phosgene, the ice water and the concentrated hydrochloric acid is 0.19mol:20.3g:120mL:0.2 mol: 60mL is 15mL, and the mass fraction of concentrated hydrochloric acid is 36%.

4. The ultraviolet-resistant fabric with good draping feeling of claim 2, wherein: the using amount ratio of the deionized water, the concentrated hydrochloric acid, the o-nitroaniline and the sodium nitrite in the step A2 is 5mL:5mL:2g:1g, the mass fraction of the concentrated hydrochloric acid is 38%, and the using amount ratio of the sodium carbonate, the p-nitrophenol and the diazo solution is 2.5g:1.3g:8 mL.

5. The ultraviolet-resistant fabric with good draping feeling of claim 2, wherein: the using amount ratio of the deionized water, the sodium hydroxide, the intermediate 1 and the thiourea dioxide in the step A3 is 150mL to 6.7g to 5.2g to 10 g.

6. The ultraviolet-resistant fabric with good draping feeling of claim 2, wherein: the using amount mass ratio of the intermediate 2 to the potassium permanganate in the step A4 is 3.5:4.2, the using amount ratio of the intermediate 5, the 3, 5-di-tert-butyl-4-hydroxybenzyl alcohol to the concentrated sulfuric acid is 0.01mol:0.01mol:15mL, the mass fraction of the concentrated sulfuric acid is 15%, and the using amount molar ratio of the intermediate 6, the intermediate 4 and the 1-hydroxybenzotriazole is 1:1: 1.1.

7. The preparation method of the ultraviolet-resistant fabric with good draping feeling according to claim 1, characterized by comprising the following steps: the method specifically comprises the following steps:

step S1: adding diphenylmethane diisocyanate, polymethyl methacrylate, polypropylene resin and p-cresol into a stirring kettle, mixing and heating to be molten under the condition that the rotating speed is 300-500r/min, adding bamboo fiber and an ultraviolet absorbent, and continuously stirring for 3-5h to prepare a molten material;

and step S2, extruding the molten material from a spinneret plate with the diameter of 0.01-0.015mm to prepare base fibers, and weaving the base fibers according to the warp density of 50-60 pieces/cm and the weft density of 40-45 pieces/cm to prepare the ultraviolet-resistant fabric.

Technical Field

The invention relates to the technical field of fabric preparation, in particular to an ultraviolet-resistant fabric with good draping feeling and a preparation method thereof.

Background

With the continuous development of science and technology and the continuous enhancement of human self-protection consciousness, people have clearly recognized that skin is a weak link of human body, is easily damaged by various external factors and also is easy to become a channel for various harmful factors to invade into the human body, so that the skin is a defense line which needs to be paid attention to. The incidence of skin diseases is increasing in recent years, and research results show that proper ultraviolet radiation is beneficial to human health, but excessive ultraviolet radiation can cause damage. Wherein UVC can be absorbed by an ozone layer 25km away from the ground when passing through the atmosphere and cannot reach the ground; most of UVB is absorbed by skin dermis, nucleic acid or protein in skin cells is promoted to be denatured, erythema and skin aging can occur after long-term radiation, and skin cancer can be caused in severe cases; UVA energy is low, but penetrates more deeply into clothing and skin than UVB, causing pigmentation of melanin, making the skin dark, accumulating for a long period of time, and still leading to skin aging. Therefore, in areas or seasons with excessive ultraviolet rays, the health of human bodies can be effectively protected by using the textile with the ultraviolet ray resistance.

The existing ultraviolet-resistant fabric has a certain ultraviolet-resistant effect, but after long-time illumination, the consumption of the internal ultraviolet-resistant components is finished, so that the ultraviolet-resistant effect of the fabric is reduced.

Disclosure of Invention

The invention aims to provide an ultraviolet-resistant fabric with good draping feeling and a preparation method thereof.

The technical problems to be solved by the invention are as follows:

the existing ultraviolet-resistant fabric has a certain ultraviolet-resistant effect, but after long-time illumination, the consumption of the internal ultraviolet-resistant components is finished, so that the ultraviolet-resistant effect of the fabric is reduced.

The purpose of the invention can be realized by the following technical scheme:

an anti-ultraviolet fabric with good drapability comprises the following raw materials in parts by weight: 30-50 parts of diphenylmethane diisocyanate, 60-70 parts of polymethyl methacrylate, 30-35 parts of polypropylene resin, 8-15 parts of p-cresol, 10-15 parts of bamboo fiber, 3-5 parts of an ultraviolet absorbent and 3-5 parts of fatty glyceride;

step S1: adding diphenylmethane diisocyanate, polymethyl methacrylate, polypropylene resin and p-cresol into a stirring kettle, mixing and heating to be molten under the condition that the rotating speed is 300-500r/min, adding bamboo fiber and an ultraviolet absorbent, and continuously stirring for 3-5h to prepare a molten material;

and step S2, extruding the molten material from a spinneret plate with the diameter of 0.01-0.015mm to prepare base fibers, and weaving the base fibers according to the warp density of 50-60 pieces/cm and the weft density of 40-45 pieces/cm to prepare the ultraviolet-resistant fabric.

Further, the ultraviolet absorbent is prepared by the following steps:

step A1, adding m-methylphenol and sodium hydroxide solution into a reaction kettle, stirring and adding dimethyl sulfate under the conditions of the rotation speed of 150-;

the reaction process is as follows:

step A2: adding deionized water and concentrated hydrochloric acid into a reaction kettle, stirring and adding o-nitroaniline under the condition that the rotation speed is 200-80 ℃ and 300r/min, cooling to 0-2 ℃ after the o-nitroaniline is completely dissolved, adding sodium nitrite, reacting for 4-6h to obtain a diazo solution, adding sodium carbonate, p-aminophenol and the diazo solution into the reaction kettle, stirring for 10-15min under the conditions that the rotation speed is 200-300r/min and the temperature is 0-2 ℃, adjusting the pH value of the mixed solution to 10-11, and continuing to react for 1.5-2h to obtain an intermediate 3;

the reaction process is as follows:

step A3, adding deionized water and sodium hydroxide into a reaction kettle, stirring and adding the intermediate 3 prepared in the step A2 under the condition that the rotating speed is 500-600r/min, adding thiourea dioxide at the temperature of 70-75 ℃ for 20-30min, and reacting for 4-6h at the temperature of 80-90 ℃ after the addition is finished to prepare an intermediate 4;

the reaction process is as follows:

step A4: adding the intermediate 2, tetrahydrofuran and deionized water prepared in the step A1 into a reaction kettle, stirring and refluxing at the rotation speed of 200-120 ℃ and potassium permanganate at the temperature of 100-120 ℃, continuing to react for 4-5h to prepare an intermediate 5, adding the intermediate 5, 3, 5-di-tert-butyl-4-hydroxybenzyl alcohol and tetrahydrofuran into the reaction kettle, stirring at the rotation speed of 150-200r/min and adding concentrated sulfuric acid, reacting at the temperature of 90-100 ℃ for 1-2h to prepare an intermediate 6, adding the intermediate 6, the intermediate 4, dimethyl sulfoxide and 1-hydroxybenzotriazole into the reaction kettle, reacting at the rotation speed of 120-150r/min and the temperature of 25-30 ℃ for 5-8h, removing dimethyl sulfoxide to obtain ultraviolet absorbent.

The reaction process is as follows:

further, the using amount ratio of the m-methylphenol, the sodium hydroxide solution and the dimethyl sulfate in the step A1 is 5g, 70mL and 36.2g, the mass fraction of the sodium hydroxide solution is 15%, and the using amount ratio of the intermediate 1, the aluminum trichloride, the dichloroethane, the phosgene, the ice water and the concentrated hydrochloric acid is 0.19mol, 20.3g, 120mL and 0.2 mol: 60mL is 15mL, and the mass fraction of concentrated hydrochloric acid is 36%.

Further, the amount ratio of the deionized water, the concentrated hydrochloric acid, the o-nitroaniline and the sodium nitrite in the step A2 is 5mL:5mL:2g:1g, the mass fraction of the concentrated hydrochloric acid is 38%, and the amount ratio of the sodium carbonate, the p-nitrophenol and the diazo solution is 2.5g:1.3g:8 mL.

Further, the using ratio of the deionized water, the sodium hydroxide, the intermediate 1 and the thiourea dioxide in the step A3 is 150mL:6.7g:5.2g:10 g.

Further, the mass ratio of the intermediate 2 to the potassium permanganate in the step A4 is 3.5:4.2, the mass ratio of the intermediate 5, the 3, 5-di-tert-butyl-4-hydroxybenzyl alcohol to the concentrated sulfuric acid is 0.01mol:0.01mol:15mL, the mass fraction of the concentrated sulfuric acid is 15%, and the mass ratio of the intermediate 6, the intermediate 4 and the 1-hydroxybenzotriazole is 1:1: 1.1.

A preparation method of an ultraviolet-resistant fabric with good draping feeling comprises the following steps:

step S1: adding diphenylmethane diisocyanate, polymethyl methacrylate, polypropylene resin and p-cresol into a stirring kettle, mixing and heating to be molten under the condition that the rotating speed is 300-500r/min, adding bamboo fiber and an ultraviolet absorbent, and continuously stirring for 3-5h to prepare a molten material;

and step S2, extruding the molten material from a spinneret plate with the diameter of 0.01-0.015mm to prepare base fibers, and weaving the base fibers according to the warp density of 50-60 pieces/cm and the weft density of 40-45 pieces/cm to prepare the ultraviolet-resistant fabric.

The invention has the beneficial effects that: the invention prepares an ultraviolet absorbent in the process of preparing an ultraviolet resistant fabric with good draping feeling, the ultraviolet absorbent takes m-methylphenol as raw material to react with dimethyl sulfate to prepare an intermediate 1, the intermediate 1 reacts with phosgene to prepare an intermediate 2, then o-nitroaniline is diazotized to prepare a diazo solution, the diazo solution reacts with p-aminophenol to prepare an intermediate 3, the intermediate 3 further reacts to prepare an intermediate 4, the intermediate 2 is oxidized by potassium permanganate to convert methyl into carboxyl to prepare an intermediate 5, the intermediate 5 and 3, 5-di-tert-butyl-4-hydroxybenzyl alcohol are esterified to prepare an intermediate 6, the intermediate 6 and the intermediate 4 are dehydrated and condensed to prepare the ultraviolet absorbent, hydrogen bond chelating rings exist in the molecules of the ultraviolet absorbent, after absorbing the ultraviolet ray, the hydrogen bond is destroyed, with ultraviolet ray energy conversion heat energy release, and the intramolecular hydrogen bond that forms between the hydrogen on the intramolecular nitrogen atom and the hydroxyl after receiving the illumination can break off, and makes the compound reach unstable high energy state, and the ultraviolet absorbent that is in high energy state gets back to the low energy state through the release heat, forms the hydrogen bond once more, and the existence of hindered phenol makes the ultraviolet resistance effect of cloth further promote.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.

Example 1

An anti-ultraviolet fabric with good drapability comprises the following raw materials in parts by weight: 30 parts of diphenylmethane diisocyanate, 60 parts of polymethyl methacrylate, 30 parts of polypropylene resin, 8 parts of p-cresol, 10 parts of bamboo fiber, 3 parts of ultraviolet absorbent and 3 parts of fatty glyceride;

step S1: adding diphenylmethane diisocyanate, polymethyl methacrylate, polypropylene resin and p-cresol into a stirring kettle, mixing and heating to be molten under the condition that the rotating speed is 300r/min, adding bamboo fiber and an ultraviolet absorbent, and continuously stirring for 3 hours to prepare a molten material;

and step S2, extruding the molten material from a spinneret plate with the diameter of 0.01mm to prepare base fibers, and weaving the base fibers according to the warp density of 50 pieces/cm and the weft density of 40 pieces/cm to prepare the ultraviolet-resistant fabric.

The ultraviolet absorbent is prepared by the following steps:

step A1, adding m-methyl phenol and a sodium hydroxide solution into a reaction kettle, stirring and adding dimethyl sulfate under the conditions of the rotation speed of 150r/min and the temperature of 28 ℃ to react for 2 hours to obtain an intermediate 1, stirring the intermediate 1, aluminum trichloride and dichloroethane under the conditions of the rotation speed of 120r/min and the temperature of 30 ℃ and introducing phosgene to react for 6 hours, heating to 65 ℃, continuing to react for 6 hours, adding ice water to continue stirring for 5 minutes, adding concentrated hydrochloric acid, and reacting for 40 hours at the temperature of 25 ℃ to obtain an intermediate 2;

step A2: adding deionized water and concentrated hydrochloric acid into a reaction kettle, stirring and adding o-nitroaniline under the condition that the rotation speed is 200r/min, stirring at the temperature of 60 ℃ until the o-nitroaniline is completely dissolved, cooling to the temperature of 0 ℃, adding sodium nitrite, reacting for 4 hours to obtain a diazo solution, adding sodium carbonate, p-aminophenol and the diazo solution into the reaction kettle, stirring at the rotation speed of 200r/min and the temperature of 0 ℃ for 10 minutes, adjusting the pH value of the mixed solution to 10, and continuing to react for 1.5 hours to obtain an intermediate 3;

step A3, adding deionized water and sodium hydroxide into a reaction kettle, stirring and adding the intermediate 3 prepared in the step A2 under the condition that the rotating speed is 500r/min, adding thiourea dioxide at the temperature of 70 ℃ for 20min, and reacting for 4h at the temperature of 80 ℃ after the addition is finished to prepare an intermediate 4;

step A4: adding the intermediate 2 prepared in the step A1, tetrahydrofuran and deionized water into a reaction kettle, stirring and refluxing at the rotation speed of 200r/min and the temperature of 100 ℃, adding potassium permanganate, continuing to react for 4 hours to prepare an intermediate 5, adding the intermediate 5, 3, 5-di-tert-butyl-4-hydroxybenzyl alcohol and tetrahydrofuran into the reaction kettle, stirring and adding concentrated sulfuric acid at the rotation speed of 150r/min, reacting at the temperature of 90 ℃ for 1 hour to prepare an intermediate 6, adding the intermediate 6, the intermediate 4, dimethyl sulfoxide and 1-hydroxybenzotriazole into the reaction kettle, reacting at the rotation speed of 120r/min and the temperature of 25 ℃ for 5 hours, and removing the dimethyl sulfoxide to prepare the ultraviolet absorbent.

Example 2

An anti-ultraviolet fabric with good drapability comprises the following raw materials in parts by weight: 40 parts of diphenylmethane diisocyanate, 65 parts of polymethyl methacrylate, 33 parts of polypropylene resin, 10 parts of p-cresol, 13 parts of bamboo fiber, 4 parts of ultraviolet absorbent and 4 parts of fatty glyceride;

step S1: adding diphenylmethane diisocyanate, polymethyl methacrylate, polypropylene resin and p-cresol into a stirring kettle, mixing and heating to be molten under the condition that the rotating speed is 300r/min, adding bamboo fiber and an ultraviolet absorbent, and continuously stirring for 5 hours to prepare a molten material;

and step S2, extruding the molten material from a spinneret plate with the diameter of 0.01mm to prepare base fibers, and weaving the base fibers according to the warp density of 60 pieces/cm and the weft density of 40 pieces/cm to prepare the ultraviolet-resistant fabric.

The ultraviolet absorbent is prepared by the following steps:

step A1, adding m-methyl phenol and a sodium hydroxide solution into a reaction kettle, stirring and adding dimethyl sulfate under the conditions of the rotation speed of 200r/min and the temperature of 28 ℃ to react for 4 hours to obtain an intermediate 1, stirring and introducing phosgene under the conditions of the rotation speed of 120r/min and the temperature of 35 ℃ to react for 6 hours, heating to 70 ℃, continuing to react for 6 hours, adding ice water, continuing to stir for 10 minutes, adding concentrated hydrochloric acid, and reacting for 50 hours under the temperature of 25 ℃ to obtain an intermediate 2;

step A2: adding deionized water and concentrated hydrochloric acid into a reaction kettle, stirring and adding o-nitroaniline under the condition that the rotation speed is 200r/min, stirring at the temperature of 80 ℃ until the o-nitroaniline is completely dissolved, cooling to the temperature of 0 ℃, adding sodium nitrite, reacting for 6 hours to obtain a diazo solution, adding sodium carbonate, p-aminophenol and the diazo solution into the reaction kettle, stirring at the rotation speed of 200r/min and the temperature of 2 ℃ for 10 minutes, adjusting the pH value of the mixed solution to 11, and continuing to react for 1.5 hours to obtain an intermediate 3;

step A3, adding deionized water and sodium hydroxide into a reaction kettle, stirring and adding the intermediate 3 prepared in the step A2 under the condition that the rotating speed is 600r/min, adding thiourea dioxide at the temperature of 70 ℃ for 30min, and reacting for 6h at the temperature of 80 ℃ after the addition is finished to prepare an intermediate 4;

step A4: adding the intermediate 2 prepared in the step A1, tetrahydrofuran and deionized water into a reaction kettle, stirring and refluxing at the rotation speed of 200r/min and at the temperature of 120 ℃, adding potassium permanganate, continuing to react for 4 hours to prepare an intermediate 5, adding the intermediate 5, 3, 5-di-tert-butyl-4-hydroxybenzyl alcohol and tetrahydrofuran into the reaction kettle, stirring and adding concentrated sulfuric acid at the rotation speed of 200r/min, reacting at the temperature of 90 ℃ for 2 hours to prepare an intermediate 6, adding the intermediate 6, the intermediate 4, dimethyl sulfoxide and 1-hydroxybenzotriazole into the reaction kettle, reacting at the rotation speed of 120r/min and at the temperature of 30 ℃ for 5 hours, and removing the dimethyl sulfoxide to prepare the ultraviolet absorbent.

Example 3

An anti-ultraviolet fabric with good drapability comprises the following raw materials in parts by weight: 50 parts of diphenylmethane diisocyanate, 70 parts of polymethyl methacrylate, 35 parts of polypropylene resin, 15 parts of p-cresol, 15 parts of bamboo fiber, 5 parts of ultraviolet absorbent and 5 parts of fatty glyceride;

step S1: adding diphenylmethane diisocyanate, polymethyl methacrylate, polypropylene resin and p-cresol into a stirring kettle, mixing and heating to be molten under the condition that the rotating speed is 500r/min, adding bamboo fiber and an ultraviolet absorbent, and continuously stirring for 5 hours to prepare a molten material;

and step S2, extruding the molten material from a spinneret plate with the diameter of 0.015mm to prepare base fibers, and weaving the base fibers according to the warp density of 60 pieces/cm and the weft density of 45 pieces/cm to prepare the ultraviolet-resistant fabric.

The ultraviolet absorbent is prepared by the following steps:

step A1, adding m-methyl phenol and a sodium hydroxide solution into a reaction kettle, stirring and adding dimethyl sulfate under the conditions of the rotation speed of 200r/min and the temperature of 30 ℃ to react for 4 hours to obtain an intermediate 1, stirring and introducing phosgene under the conditions of the rotation speed of 150r/min and the temperature of 35 ℃ to react for 10 hours, heating to 70 ℃, continuing to react for 10 hours, adding ice water, continuing to stir for 10 minutes, adding concentrated hydrochloric acid, and reacting for 50 hours under the temperature of 30 ℃ to obtain an intermediate 2;

step A2: adding deionized water and concentrated hydrochloric acid into a reaction kettle, stirring and adding o-nitroaniline under the condition that the rotation speed is 300r/min, stirring at the temperature of 80 ℃ until the o-nitroaniline is completely dissolved, cooling to the temperature of 2 ℃, adding sodium nitrite, reacting for 6 hours to obtain a diazo solution, adding sodium carbonate, p-aminophenol and the diazo solution into the reaction kettle, stirring at the rotation speed of 300r/min and the temperature of 2 ℃ for 15 minutes, adjusting the pH value of the mixed solution to 11, and continuing to react for 2 hours to obtain an intermediate 3;

step A3, adding deionized water and sodium hydroxide into a reaction kettle, stirring and adding the intermediate 3 prepared in the step A2 under the condition that the rotating speed is 600r/min, adding thiourea dioxide at the temperature of 75 ℃ for 30min, and reacting for 6h at the temperature of 90 ℃ after the addition is finished to prepare an intermediate 4;

step A4: adding the intermediate 2 prepared in the step A1, tetrahydrofuran and deionized water into a reaction kettle, stirring and refluxing at the rotation speed of 300r/min and the temperature of 120 ℃, adding potassium permanganate, continuing to react for 5 hours to prepare an intermediate 5, adding the intermediate 5, 3, 5-di-tert-butyl-4-hydroxybenzyl alcohol and tetrahydrofuran into the reaction kettle, stirring and adding concentrated sulfuric acid at the rotation speed of 200r/min, reacting at the temperature of 100 ℃ for 2 hours to prepare an intermediate 6, adding the intermediate 6, the intermediate 4, dimethyl sulfoxide and 1-hydroxybenzotriazole into the reaction kettle, reacting at the rotation speed of 150r/min and the temperature of 30 ℃ for 8 hours, and removing the dimethyl sulfoxide to prepare the ultraviolet absorbent.

Comparative example

The comparative example is a common uvioresistant fabric in the market.

The results of the tests performed on the uv resistant fabrics obtained in examples 1 to 3 and comparative example are shown in table 1 below;

tensile strength of the uvioresistant fabrics prepared in examples 1-3 and comparative example was measured, and the uvioresistant fabrics were irradiated with light of 340nm at an irradiation intensity of 0.68W/m²The temperature of the blackboard is 60 ℃, and the condensation temperature is 60 ℃; a single cycle process; illuminating for 3h, and blowing for 10 min; and continuously repeating the cycle process, wherein the total experiment time is 200h, and detecting whether the tensile strength is reduced or not.

TABLE 1

	Example 1	Example 2	Example 3	Comparative example
					Whether or not the tensile strength is reduced	Is not lowered	Is not lowered	Is not lowered	Is greatly reduced

As can be seen from table 1 above, the tensile strength of the uv resistant fabrics prepared in examples 1 to 3 did not decrease after being irradiated with external light, and the tensile strength of the uv resistant fabrics prepared in the comparative example did decrease significantly after being irradiated with external light.

The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.