A down jacket fabric having an aerogel coating

Abstract

The application discloses a down jacket fabric with aerogel coating, which comprises a base fabric and an aerogel coating coated on at least one surface of the base fabric, and the preparation raw materials of the aerogel coating comprise 40-80 wt% of a coating matrix, 10-25 wt% of modified silica aerogel particles and 10-35 wt% of an auxiliary agent, wherein the modified silica aerogel particles are obtained by sequentially subjecting silica aerogel particles to moisture regain treatment and heat treatment. The modified silica aerogel particles used in the application can be transformed from amorphous to crystal through heat treatment, thereby significantly improving the mechanical strength of the aerogel particles, so that the phenomenon of coating being scraped, pressed or worn is effectively avoided; the moisture regain treatment can effectively reduce the pore collapse and particle aggregation phenomenon in the crystal transformation process, so that the porous framework structure of the aerogel is maintained, the advantages of the aerogel in the warm-keeping performance are maintained, and the heat treatment at a temperature of 800 DEG C or above can be used after the moisture regain treatment, which is helpful to deepening the degree of crystal transformation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fabric preparation, in particular to a down jacket fabric with aerogel coating. BACKGROUND

[0002] As a nano-porous solid material, aerogel can significantly improve the warmth retention performance of down jacket fabric by covering an aerogel coating on the surface of the down jacket fabric, thereby allowing the down jacket to be made into a light and thin type while the fabric still maintains a soft hand feeling and increases the wearing comfort.

[0003] However, as a special material, aerogel has many unique advantages, but also has some obvious disadvantages, the most important of which is that aerogel has low density and loose structure, resulting in weak mechanical strength, which is easily broken or damaged, especially in occasions requiring high mechanical strength, the use of aerogel has obvious limitations.

[0004] Therefore, the conventional process of covering an aerogel coating on the surface of the down jacket fabric has poor durability of the aerogel coating, which is easily scratched, damaged and worn, reducing the warmth retention performance and aesthetic appearance. SUMMARY

[0005] The present application provides a down jacket fabric with an aerogel coating, which solves the problem of low mechanical strength of the coating of the existing aerogel coated down jacket fabric, which is easily scratched, damaged and worn.

[0006] The present application achieves the above-mentioned purpose through the following technical solutions:

[0007] A down jacket fabric with an aerogel coating, comprising a base fabric and an aerogel coating coated on at least one surface of the base fabric, the preparation raw materials of the aerogel coating comprising 40-80wt% of a coating base, 10-25wt% of modified silica aerogel particles and 10-35wt% of an auxiliary agent, the modified silica aerogel particles being obtained by sequentially subjecting silica aerogel particles to moisture conditioning and heat treatment.

[0008] Further improvement is that the base fabric is selected from one of natural fiber fabric, chemical fiber fabric, regenerated fiber fabric and blended fabric.

[0009] Further improvement is that the coating base is selected from one or more of bisphenol A epoxy resin, hydroxyethyl methacrylate, acrylic emulsion, polyvinyl acetate emulsion and melamine formaldehyde resin.

[0010] Further improvement is that the auxiliary agent includes toluene, polyethylene glycol, sodium hexametaphosphate, polyvinyl alcohol and ethanol.

[0011] Further improvement lies in that the mass ratio of the auxiliary agents is toluene: polyethylene glycol: sodium hexametaphosphate: polyvinyl alcohol: ethanol = 1:1.2:0.5:1.5:2.

[0012] Further improvement lies in that the moisture regain treatment refers to that the silica aerogel particles are placed in a constant temperature and humidity box with a temperature of 40-50℃ and a humidity of 80-90% for 2-5h, so that the moisture regain of the silica aerogel particles reaches 8-12%.

[0013] Further improvement lies in that, during the moisture regain treatment, isopentyl alcohol vapor is introduced into the box and the air pressure in the box is controlled to be 300-320kPa.

[0014] Further improvement lies in that the heat treatment refers to that the silica aerogel particles are placed in a crucible, heated from room temperature to 800-850℃ at a heating rate of 10-12℃ / min under a nitrogen atmosphere, and then kept for 0.2-0.5h.

[0015] The application has the advantages that the modified silica aerogel particles used in the application are subjected to moisture regain treatment and heat treatment, the heat treatment can make the silica aerogel particles change from amorphous to crystalline, significantly improve the mechanical strength, thereby effectively avoiding the phenomenon of scratching, crushing or wearing of the coating, the moisture regain treatment can effectively reduce the phenomenon of pore collapse and particle aggregation during the crystalline transformation, maintain the porous framework structure of the aerogel, thereby maintain the advantage of the aerogel in the warmth performance, and the heat treatment above 800℃ can be used after the moisture regain treatment, which helps to deepen the degree of crystalline transformation. In addition, the isopentyl alcohol vapor and high pressure auxiliary conditions are used during the moisture regain treatment, which can reduce the surface tension of the particles and improve the compatibility, thereby improving the moisture regain effect. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an electron microscope SEM graph of the modified silica aerogel particles of Example 4;

[0017] Figure 2 It is an electron microscope SEM graph of the modified silica aerogel particles of Comparative Example 1;

[0018] Figure 3 It is an electron microscope SEM graph of the silica aerogel particles of Comparative Example 2; DETAILED DESCRIPTION

[0019] It is necessary to point out here that the following detailed description is only used to further illustrate the application and cannot be understood as limiting the protection scope of the application, and the skilled in the art can make some non-essential improvements and adjustments to the application according to the above application content.

[0020] I. Main instruments and materials

[0021] Silica aerogel particles: Commonly commercially available hydrophilic silica aerogel particles, white and slightly transparent, particle size between 0.02-0.05mm, density 92.4kg / m 3 , Brunau-Emmett Teller (BET) model to calculate its porosity of 96.5%.

[0022] Electronic microscope: S4800 type scanning electron microscope (SEM) of Japan Hitachi Company.

[0023] II. Experimental implementation

[0024] Example 1

[0025] A down jacket fabric with aerogel coating, comprising a base fabric and an aerogel coating coated on at least one surface of the base fabric, the preparation raw materials of the aerogel coating include 40wt% of coating matrix, 25wt% of modified silica aerogel particles and 35wt% of auxiliary agents, the modified silica aerogel particles are obtained by silica aerogel particles sequentially through moisture conditioning and heat treatment.

[0026] The moisture conditioning refers to: placing the silica aerogel particles in a constant temperature and humidity chamber with a temperature of 40℃ and a humidity of 80% for 5h (normal pressure), so that the moisture regain of the silica aerogel particles reaches 8%. The heat treatment refers to: placing the silica aerogel particles in a crucible, heating from room temperature to 800℃ at a heating rate of 10℃ / min under nitrogen atmosphere, and then keeping the temperature for 0.5h.

[0027] In addition, the base fabric is selected from natural cotton fiber fabric; the coating matrix is selected from bisphenol A epoxy resin; the auxiliary agents include toluene, polyethylene glycol, sodium hexametaphosphate, polyvinyl alcohol and ethanol, and the mass ratio of each auxiliary agent is toluene: polyethylene glycol: sodium hexametaphosphate: polyvinyl alcohol: ethanol = 1:1.2:0.5:1.5:2.

[0028] Example 2

[0029] A down jacket fabric with aerogel coating, comprising a base fabric and an aerogel coating coated on at least one surface of the base fabric, the preparation raw materials of the aerogel coating include 40wt% of coating matrix, 25wt% of modified silica aerogel particles and 35wt% of auxiliary agents, the modified silica aerogel particles are obtained by silica aerogel particles sequentially through moisture conditioning and heat treatment.

[0030] The moisture regain treatment refers to: placing the silica aerogel particles in a constant temperature and humidity chamber with a temperature of 45℃ and a humidity of 85% for 3h (atmospheric pressure), so that the moisture regain rate of the silica aerogel particles reaches 10%. The heat treatment refers to: placing the silica aerogel particles in a crucible, heating from room temperature to 820℃ at a heating rate of 11℃ / min under a nitrogen atmosphere, and then keeping the temperature for 0.4h.

[0031] In addition, the base fabric is selected from polyester fiber fabric; the coating base is selected from acrylic emulsion and polyvinyl acetate emulsion (mass ratio 1:1); the auxiliary agent includes toluene, polyethylene glycol, sodium hexametaphosphate, polyvinyl alcohol and ethanol, and the mass ratio of each auxiliary agent is toluene: polyethylene glycol: sodium hexametaphosphate: polyvinyl alcohol: ethanol = 1:1.2:0.5:1.5:2.

[0032] Example 3

[0033] A down jacket fabric with an aerogel coating layer, comprising a base fabric and an aerogel coating layer coated on at least one surface of the base fabric, and the preparation raw materials of the aerogel coating layer include 80wt% of a coating base, 10wt% of modified silica aerogel particles and 10wt% of an auxiliary agent, wherein the modified silica aerogel particles are obtained by sequentially subjecting silica aerogel particles to moisture regain treatment and heat treatment.

[0034] The moisture regain treatment refers to: placing the silica aerogel particles in a constant temperature and humidity chamber with a temperature of 50℃ and a humidity of 90% for 2h (atmospheric pressure), so that the moisture regain rate of the silica aerogel particles reaches 12%. The heat treatment refers to: placing the silica aerogel particles in a crucible, heating from room temperature to 850℃ at a heating rate of 12℃ / min under a nitrogen atmosphere, and then keeping the temperature for 0.2h.

[0035] In addition, the base fabric is selected from modal fiber fabric; the coating base is selected from melamine formaldehyde resin; the auxiliary agent includes toluene, polyethylene glycol, sodium hexametaphosphate, polyvinyl alcohol and ethanol, and the mass ratio of each auxiliary agent is toluene: polyethylene glycol: sodium hexametaphosphate: polyvinyl alcohol: ethanol = 1:1.2:0.5:1.5:2.

[0036] Example 4

[0037] A down jacket fabric with an aerogel coating layer, comprising a base fabric and an aerogel coating layer coated on at least one surface of the base fabric, and the preparation raw materials of the aerogel coating layer include 60wt% of a coating base, 20wt% of modified silica aerogel particles and 20wt% of an auxiliary agent, wherein the modified silica aerogel particles are obtained by sequentially subjecting silica aerogel particles to moisture regain treatment and heat treatment.

[0038] The moisture regain treatment refers to: placing the silica aerogel particles in a constant temperature and humidity chamber with a temperature of 45℃ and a humidity of 85% for 3h, so that the moisture regain rate of the silica aerogel particles reaches 10%; and during the moisture regain treatment, isopentyl alcohol vapor is introduced into the chamber and the air pressure in the chamber is controlled to be 300kPa. The heat treatment refers to: placing the silica aerogel particles in a crucible, heating from room temperature to 820℃ at a heating rate of 11℃ / min under a nitrogen atmosphere, and then keeping the temperature for 0.4h.

[0039] The electron microscope SEM image of the obtained modified silica aerogel particles is shown in Figure 1 As can be seen from the figure, the particles have been crystallized, but the micro-pore structure is rarely damaged, and the phenomenon of pore collapse and particle aggregation is not obvious.

[0040] In addition, the base fabric is selected to be a polyester fiber fabric; the coating base is selected to be an acrylic emulsion and a polyvinyl acetate emulsion (mass ratio 1:1); the auxiliary agent includes toluene, polyethylene glycol, sodium hexametaphosphate, polyvinyl alcohol and ethanol, and the mass ratio between each auxiliary agent is toluene: polyethylene glycol: sodium hexametaphosphate: polyvinyl alcohol: ethanol = 1:1.2:0.5:1.5:2.

[0041] Comparative Example 1

[0042] A down jacket fabric with an aerogel coating layer, comprising a base fabric and an aerogel coating layer coated on at least one surface of the base fabric, the preparation raw materials of the aerogel coating layer comprising 60wt% of a coating base, 20wt% of modified silica aerogel particles and 20wt% of an auxiliary agent, the modified silica aerogel particles being obtained by sequentially subjecting silica aerogel particles to heat treatment.

[0043] The heat treatment refers to: placing the silica aerogel particles in a crucible, heating from room temperature to 820℃ at a heating rate of 11℃ / min under a nitrogen atmosphere, and then keeping the temperature for 0.4h.

[0044] The electron microscope SEM image of the obtained modified silica aerogel particles is shown in Figure 2 As can be seen from the figure, the particles have been completely crystallized, and the micro-pore structure has been completely destroyed, and the particles have become large and aggregated together.

[0045] In addition, the base fabric is selected to be a polyester fiber fabric; the coating base is selected to be an acrylic emulsion and a polyvinyl acetate emulsion (mass ratio 1:1); the auxiliary agent includes toluene, polyethylene glycol, sodium hexametaphosphate, polyvinyl alcohol and ethanol, and the mass ratio between each auxiliary agent is toluene: polyethylene glycol: sodium hexametaphosphate: polyvinyl alcohol: ethanol = 1:1.2:0.5:1.5:2.

[0046] Comparative Example 2

[0047] A down jacket fabric with aerogel coating, comprising a base fabric and an aerogel coating coated on at least one surface of the base fabric, and the raw materials for preparing the aerogel coating include 60wt% of a coating base, 20wt% of silica aerogel particles and 20wt% of an auxiliary agent.

[0048] The electron microscope SEM image of the silica aerogel particles is shown in Figure 3 It can be seen that the porous structure is obvious and the particles are dispersed.

[0049] The base fabric is selected from polyester fiber fabric; the coating base is selected from acrylic emulsion and polyvinyl acetate emulsion (mass ratio 1:1); the auxiliary agent includes toluene, polyethylene glycol, sodium hexametaphosphate, polyvinyl alcohol and ethanol, and the mass ratio of each auxiliary agent is toluene: polyethylene glycol: sodium hexametaphosphate: polyvinyl alcohol: ethanol = 1:1.2:0.5:1.5:2.

[0050] The preparation methods of the above examples and comparative examples are the same, specifically: first, mix all the raw materials of the aerogel coating in proportion to obtain a coating, then uniformly coat the coating on the surface of the well-woven base fabric, here the single-sided coating method is adopted, and the coating thickness is controlled at 0.6mm.

[0051] III. Performance test

[0052] Take the down jacket fabric samples with aerogel coating prepared in Examples 1-4 and Comparative Examples 1-2, and test their performance as follows:

[0053] (1) Heat retention performance: take six groups of sealable glass bottles filled with 90℃ water (5 bottles in each group), and use the fabric samples prepared in Examples 1-4 and Comparative Examples 1-2 to wrap the sides of each group respectively, then place them in a normal temperature environment, record the water temperature in the glass bottles after 2h, calculate the average temperature loss rate of each group, the calculation formula is: temperature loss rate = (initial temperature-2h later temperature) / initial temperature*100%, and the calculation results are shown in Table 1 below.

[0054] (2) Abrasion resistance: according to GB / T21196.2-2007 "Determination of the abrasion resistance of fabrics by the Martindale method", test the abrasion resistance of the down jacket fabric samples in the initial state and after folding 10000 times, detect the abrasion resistance index Ai (average mass loss per rubbing), and the statistical results are shown in Table 2 below.

[0055] IV. Result analysis

[0056] (1) Heat retention performance.

[0057] Table 1: Temperature loss rate results of each example and comparative example

[0058] Group Initial temperature Temperature after 2h Average temperature loss rate / % Example 1 90.0℃ 49.3℃ 45.2％ Example 2 90.0℃ 52.9℃ 41.2％ Example 3 90.0℃ 51.7℃ 42.6％ Example 4 90.0℃ 60.6℃ 32.6％ Comparative Example 1 90.0℃ 38.5℃ 57.2％ Comparative Example 2 90.0℃ 62.1℃ 31.0％

[0059] (2) Wear resistance.

[0060] Table 2: Wear resistance index Ai results of various embodiments and comparative examples

[0061]

[0062] Analysis: It can be seen from Tables 1 and 2 above that Examples 1-3 of the present invention use modified silica aerogel particles that have undergone moisture retention and heat treatment, and their overall thermal insulation performance is good, which is significantly improved compared to Comparative Example 1 (not subjected to moisture retention treatment). The wear resistance of Examples 1-3 is also good, close to the level of Comparative Example 1, and significantly better than Comparative Example 2 (ordinary silica aerogel particle coating); Based on Example 2, Example 4 of the present invention adds auxiliary conditions of isoamyl alcohol vapor and high pressure during the moisture retention process, so that the thermal insulation performance is further improved, which is equivalent to Comparative Example 2; In addition, the silica aerogel particles of Comparative Example 1 have only undergone heat treatment, and although their wear resistance is the best, their thermal insulation performance is the worst; Comparative Example 2 uses ordinary silica aerogel particles, and its thermal insulation performance is the best, but its wear resistance is the worst.

[0063] In summary, the present invention uses modified silica aerogel particles that have been subjected to moisture retention and heat treatment to effectively reduce pore collapse and particle aggregation during the crystal transformation process, maintain the porous skeleton structure of the aerogel, and thus maintain the advantage of the aerogel in thermal insulation performance, so that the fabric has both thermal insulation and mechanical strength. And after the moisture retention treatment, a heat treatment of more than 800°C can be used (generally, a heat treatment of more than 700°C will basically completely destroy the aerogel structure and make it lose its function), which helps to deepen the degree of crystal transformation. In addition, the auxiliary conditions of isoamyl alcohol vapor and high pressure are used during the moisture retention treatment to reduce the surface tension of the particles and improve compatibility, thereby improving the moisture retention effect, and ultimately reflected in the further improvement of thermal insulation performance.

[0064] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A down jacket fabric with an aerogel coating, comprising a base fabric and an aerogel coating coated on at least one surface of the base fabric, characterized in that: The raw materials for preparing the aerogel coating include 40-80 wt% of a coating matrix, 10-25 wt% of modified silica aerogel particles, and 10-35 wt% of an additive. The modified silica aerogel particles are obtained by sequentially subjecting silica aerogel particles to moisture conditioning treatment and heat treatment. The coating matrix is ​​selected from one or more of bisphenol A epoxy resin, hydroxyethyl methacrylate, acrylic emulsion, polyvinyl acetate emulsion, and melamine formaldehyde resin; The auxiliary agent includes toluene, polyethylene glycol, sodium hexametaphosphate, polyvinyl alcohol and ethanol; The moisture regain treatment refers to placing the silica aerogel particles in a constant temperature and humidity chamber at a temperature of 40-50°C and a humidity of 80-90% for 2-5 hours, so that the moisture regain of the silica aerogel particles reaches 8-12%; During the rehumidification process, isoamyl alcohol vapor is introduced into the chamber and the pressure in the chamber is controlled at 300-320 kPa; The heat treatment comprises placing the silica aerogel particles in a crucible, heating the crucible from room temperature to 800-850° C. at a heating rate of 10-12° C. / min under a nitrogen atmosphere, and then maintaining the temperature for 0.2-0.5 h.

2. The down jacket fabric with aerogel coating according to claim 1, characterized in that: The basic fabric is selected from one of natural fiber fabric, chemical fiber fabric, regenerated fiber fabric and blended fabric.

3. The down jacket fabric with aerogel coating according to claim 1, characterized in that: The mass ratio of each additive is toluene: polyethylene glycol: sodium hexametaphosphate: polyvinyl alcohol: ethanol = 1:1.2:0.5:1.5:2.

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