阅读说明：本技术 保暖材料、制备保暖材料的方法、以保暖材料制备的制品 (Thermal insulation material, method for preparing thermal insulation material and product prepared from thermal insulation material ) 是由 胡伟立 林炜罡 史凡 李宇 于 2020-07-17 设计创作，主要内容包括：本公开实施例提供了一种保暖材料、制备保暖材料的方法、以保暖材料制备的制品。本公开实施例的保暖材料,包括：一非织造基材,其于1KPa压强下的厚度保持率至少为70％；一干凝胶；一阳离子界面活性剂,其包括一四级铵盐且均匀分布于所述干凝胶；其中,所述非织造基材在所述保暖材料中的重量百分含量为20-96.7％,所述干凝胶在所述保暖材料中的重量百分含量3-60％,所述阳离子界面活性剂在所述保暖材料中的重量百分含量0.3-20％。(The embodiment of the disclosure provides a thermal insulation material, a method for preparing the thermal insulation material and a product prepared from the thermal insulation material. The thermal insulation material of the embodiment of the disclosure includes: a nonwoven substrate having a thickness retention of at least 70% at a pressure of 1 KPa; a xerogel; a cationic surfactant comprising a quaternary ammonium salt uniformly distributed on the xerogel; wherein the weight percentage of the non-woven base material in the thermal insulation material is 20-96.7%, the weight percentage of the xerogel in the thermal insulation material is 3-60%, and the weight percentage of the cationic surfactant in the thermal insulation material is 0.3-20%.)

1. A thermal material comprising:

a nonwoven substrate having a thickness retention of at least 70% at a pressure of 1 KPa;

a xerogel; and

a cationic surfactant comprising a quaternary ammonium salt uniformly distributed on the xerogel;

wherein the weight percentage of the non-woven base material in the thermal insulation material is 20-96.7%, the weight percentage of the xerogel in the thermal insulation material is 3-60%, and the weight percentage of the cationic surfactant in the thermal insulation material is 0.3-20%.

2. The thermal insulation material according to claim 1, wherein the material of the nonwoven substrate is at least one selected from the group consisting of polyester fibers, nylon fibers, acrylic fibers, polypropylene fibers, polylactic acid fibers, and cellulose fibers.

3. The thermal material of claim 1, wherein the nonwoven substrate has an initial thickness of 2 to 50mm at a pressure of 0.02 KPa.

4. The thermal material according to claim 1, wherein the xerogel is formed from a gel comprising an organosilica precursor and the silicone comprises an alkoxysilane.

5. The thermal material according to claim 4, wherein the alkoxysilane comprises an alkyltrialkoxysilane that is methyltrimethoxysilane, vinyltrimethoxysilane, or a combination thereof.

6. The thermal material according to claim 4, wherein the alkoxysilane comprises a dialkoxysilane selected from the group consisting of diethoxysilane, dimethoxysilane, and combinations thereof.

7. The thermal material of claim 4, wherein the gel further comprises a solvent and a catalyst.

8. The thermal material of claim 7, wherein the solvent comprises an alcohol selected from the group consisting of methanol, ethanol, and combinations thereof.

9. The thermal material according to claim 7, wherein the catalyst includes an acidic catalyst and a basic catalyst.

10. The thermal material according to claim 9, wherein the acidic catalyst is selected from the group consisting of oxalic acid, hydrochloric acid, and combinations thereof.

11. The thermal material according to claim 9, wherein the basic catalyst is selected from the group consisting of ammonia, urea, and a combination thereof.

12. The thermal material according to claim 1, wherein the quaternary ammonium salt of the cationic surfactant is selected from quaternary ammonium halide salts.

13. The thermal material of claim 12 wherein the quaternary ammonium halogen salts are selected from the group consisting of cetyltrimethyl ammonium bromide, cetyltrimethyl ammonium chloride, benzalkonium bromide, benzalkonium chloride, and combinations thereof.

14. A preparation method of a thermal insulation material comprises the following steps:

(a) providing a sol and a cationic surfactant, wherein the cationic surfactant comprises quaternary ammonium salt;

(b) co-condensing the sol and the cationic surfactant to form a gel;

(c) providing a nonwoven substrate having a thickness retention of at least 70% at a pressure of 1 KPa;

(d) soaking the nonwoven substrate in the gel;

(e) and heating and drying the non-woven substrate impregnated with the gel under atmospheric pressure to form the thermal insulation material with a xerogel bonded on the non-woven substrate, wherein the weight percentage of the non-woven substrate in the thermal insulation material is 20-96.7%, the weight percentage of the xerogel in the thermal insulation material is 3-60%, and the weight percentage of the cationic surfactant in the thermal insulation material is 0.3-20%.

15. The method for producing a thermal material according to claim 14, wherein the sol includes an organosilica precursor, and the silicone includes an alkoxysilane.

16. The method of making a thermal material according to claim 15, wherein the alkoxysilane comprises an alkyltrialkoxysilane that is methyltrimethoxysilane, vinyltrimethoxysilane, or a combination thereof.

17. The method of producing a thermal material according to claim 15, wherein the alkoxysilane includes a dialkoxysilane selected from the group consisting of diethoxysilane, dimethoxysilane, and a combination thereof.

18. The method for producing a thermal material according to claim 14, wherein the quaternary ammonium salt is selected from quaternary ammonium halogen salts.

19. The method of making a thermal material according to claim 18, wherein the quaternary ammonium halide salt is selected from the group consisting of cetyltrimethyl ammonium bromide, cetyltrimethyl ammonium chloride, benzalkonium bromide, benzalkonium chloride, and combinations thereof.

20. The method for preparing a thermal insulation material according to claim 14, wherein the sol further comprises a solvent and a catalyst.

21. The method of making a thermal material according to claim 20, wherein the solvent comprises an alcohol selected from the group consisting of methanol, ethanol, and combinations thereof.

22. The method for producing a thermal material according to claim 20, wherein the catalyst includes an acidic catalyst and a basic catalyst.

23. The method for preparing a thermal insulation material according to claim 14, wherein the material of the non-woven substrate is at least one selected from the group consisting of polyester fiber, nylon fiber, acrylic fiber, polypropylene fiber, polylactic acid fiber and cellulose fiber, and the non-woven substrate has an initial thickness of 2 to 50mm at a pressure of 0.02 KPa.

24. The method for preparing thermal insulation material according to claim 14, wherein the heating condition in step (e) is 110-150 ℃.

25. An article made with the thermal material of any of claims 1-13.

Technical Field

The application relates to a thermal material, a method for preparing the thermal material and a product prepared from the thermal material. In particular, the present application relates to a thermal material comprising a xerogel, a method of making a thermal material, and articles thereof.

Background

Thermal insulation materials are widely used in clothing, footwear, gloves, etc., or bedding such as quilts. In order to achieve the effect of keeping warm, the structure of the warm-keeping material can keep air in the warm-keeping material, thereby reducing the dissipation of heat energy.

In some applications where space is limited and warming needs to be achieved, for example: in footwear applications, the thermal insulation material is compressed to affect the thermal insulation effect, so that a technique of maintaining the thermal insulation effect by using the low density and porosity characteristics of aerogel (aerogel) or xerogel (xenogel) is currently used.

In some documents, the terms "xerogel" and "aerogel" are used to describe porous solids formed by drying a gel. Generally, the difference between xerogels and aerogels is based on the porosity and density of the structure. Xerogels typically have a porosity of 20-40% and a density of between 0.5-0.8 g/cc; aerogels generally have densities between 0.1 and 0.2g/cc and porosities of at least 75%.

However, aerogels or xerogels are brittle due to their porosity and thus have limited applications, and maintaining structural integrity in a compressed state is also an important issue. Among the existing aerogel or xerogel products, there are those which use various techniques to increase the physical structural strength of their sol, for example, WO2013053951 uses a fiber reinforcement in the preparation of a xerogel, WO1997023675a2 discloses a composite material formed from thermoplastic fibers and aerogel particles, WO2017087511 discloses a synthetic fiber comprising aerogel particles and a polymeric material, and US20160060808a1 discloses a thermal insulation sheet comprising silica xerogel and a nonwoven fabric. However, these prior art techniques still fail to overcome the problem of easy breaking of aerogels or xerogels; in addition, many processes for preparing aerogels use subcritical or supercritical conditions, or require solvent exchange preparation, such as CN102964111A, and therefore the process is complicated and expensive.

In addition, there are some techniques for covering the surface of an aerogel or xerogel with a polymer to overcome the problem of brittleness, but these methods sacrifice breathability and increase weight of the thermal insulation material article.

Disclosure of Invention

In view of the above, embodiments of the present disclosure provide a thermal material, a method of making a thermal material, and an article made with a thermal material. The heat-insulating material provided by the embodiment of the disclosure does not need to be prepared under severe conditions such as supercritical and subcritical conditions or in a solvent exchange mode, so that the preparation process and the preparation cost are facilitated to be simplified, and the obtained heat-insulating material still has certain structural strength, heat-insulating degree and air permeability, so that the heat-insulating material can be widely applied to various products. In addition, because the heat preservation material of this disclosed embodiment has more antibiotic advantage, because of stable in structure also keeps cold-proof effect under the compression state simultaneously, consequently also be applicable to the environment that easily grows the bacterium, for example but not limited to shoes.

Generally, the thermal material according to the embodiment of the disclosure includes a non-woven substrate, a xerogel and a cationic surfactant, wherein the thickness retention rate of the non-woven substrate under a pressure of 1KPa is at least 70%, the cationic surfactant includes a quaternary ammonium salt and is uniformly distributed in the xerogel, wherein the non-woven substrate is 20-96.7% by weight in the thermal material, the xerogel is 3-60% by weight in the thermal material, and the cationic surfactant is 0.3-20% by weight in the thermal material.

In some embodiments, the material of the nonwoven substrate is selected from at least one of polyester fibers, nylon fibers, acrylic fibers, polypropylene fibers, polylactic acid fibers, and cellulosic fibers.

In some embodiments, the nonwoven substrate has an initial thickness of between 2 and 50mm at a pressure of 0.02 KPa.

In some embodiments, the xerogel is formed from a gel comprising an organosilica precursor, and the organosilicon comprises an alkoxysilane.

In some embodiments, the alkoxysilane comprises an alkyltrialkoxysilane, optionally wherein the alkyltrialkoxysilane is methyltrimethoxysilane, vinyltrimethoxysilane, and combinations thereof; or, the alkoxysilane comprises a dialkoxysilane, optionally wherein the dialkoxysilane is selected from the group consisting of diethoxysilane, dimethoxysilane, and combinations thereof.

In some embodiments, the gel further comprises a solvent and a catalyst. Solvents include alcohols, for example: methanol, ethanol, or a combination thereof; the catalyst includes an acidic catalyst (such as oxalic acid, hydrochloric acid, or a combination thereof) and a basic catalyst (such as ammonia, urea, or a combination thereof).

In some embodiments, the quaternary ammonium salt of the cationic surfactant is selected from quaternary ammonium halide salts, such as: cetyl trimethyl ammonium bromide, cetyl trimethyl ammonium chloride, benzalkonium bromide, benzalkonium chloride, or combinations thereof.

The embodiment of the disclosure further provides a preparation method of the thermal insulation material, which comprises the following steps: (a) providing a sol and a cationic surfactant, wherein the cationic surfactant comprises quaternary ammonium salt; (b) co-condensing the sol and the cationic surfactant to form a gel; (c) providing a nonwoven substrate having a thickness retention of at least 70% at a pressure of 1 KPa; (d) soaking the nonwoven substrate in the gel; and (e) heating and drying the non-woven substrate impregnated with the gel under atmospheric pressure to form the thermal insulation material with a xerogel bonded on the non-woven substrate, wherein the weight percentage of the non-woven substrate in the thermal insulation material is 20-96.7%, the weight percentage of the xerogel in the thermal insulation material is 3-60%, and the weight percentage of the cationic surfactant in the thermal insulation material is 0.3-20%.

The disclosed embodiments also provide an article made of the aforementioned thermal material.

Drawings

The accompanying drawings are included to provide a further understanding of the embodiments of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the principles of the disclosure and not to limit the disclosure. The above and other features and advantages will become more apparent to those skilled in the art by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which:

fig. 1 is a photograph of a thermal material made according to an embodiment of the disclosure.

Detailed Description

In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, the thermal insulation material, the method for manufacturing the thermal insulation material, and the article manufactured by the thermal insulation material provided in the embodiments of the present disclosure are described in detail below with reference to the drawings.

The disclosed embodiments will be described more fully hereinafter with reference to the accompanying drawings, but the illustrated embodiments may be embodied in different forms and should not be construed as limited to the embodiments set forth in the disclosure. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Embodiments of the present disclosure and features of embodiments may be combined with each other without conflict.

The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure, the term "and/or" includes any and all combinations of one or more of the associated listed items. As used in this disclosure, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," comprising, "" prepared from "… …," as used in this disclosure, specify the presence of stated features, integers, steps, operations, components, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, and/or groups thereof.

Unless otherwise defined, all terms (including technical and scientific terms) used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Unless otherwise defined, the following terms or descriptions have the following meanings in the present application:

"xerogel" is used to describe the final product of a porous solid formed by drying a gel.

"Sol" refers to the raw material used to form the gel.

"gel" refers to a colloidal material formed by gluing and co-condensing a sol; in this application, both sol and gel are used to describe the gel before it forms a xerogel.

"Organosilicon oxide precursor" refers to a material that forms organosilicon oxides upon hydrolytic cocondensation.

"initial caliper" refers to the average caliper of a nonwoven substrate measured at a pressure of 0.02 KPa.

"gsm", grammage, means grams per square meter, i.e. gram weight per square meter of material.

The 'Clo (Clo) value' is a parameter for evaluating the heat-insulating ability of the material, and the essence is a thermal resistance value, wherein the larger the value is, the better the heat-insulating ability is; wherein, when a person who is quiet or who is engaged in brain work (calorific value is 209.2kJ/m 2. h) feels comfortable in an environment where the temperature is 21 ℃, the relative humidity is less than 50%, and the wind speed is not more than 0.lm/s, the Clo value of the clothes worn by the person is 1.

The description of "A to B" or "A-B" includes the values of A, B, and any values greater than A and less than B.

"the weight percentage of A in B" means that A is a part of B, and the weight percentage of A is taken as 100% of the weight of B.

The embodiment of the disclosure provides a thermal insulation material, which comprises a non-woven substrate, a xerogel and a cationic surfactant, wherein the cationic surfactant is dispersed in the xerogel, and the xerogel is evenly distributed on the surface and in pores of the non-woven substrate and is combined with the non-woven substrate, so that the non-woven substrate can capture air by virtue of the porous pores of the xerogel, thereby achieving the thermal insulation effect.

In some embodiments, the material of the nonwoven substrate may be selected from polyester fibers, such as vertically lapped 100% polyester fibers (vertical lapped nonwoven polyester), and the grammage may be, but is not limited to, 50 to 1240 gsm.

In addition, the initial thickness of the non-woven substrate is preferably between 2 mm and 50mm, and the thickness retention rate under the pressure of 1KPa is at least 70%, that is, the thickness of the non-woven substrate under the pressure of 1KPa is not lower than 70% of the initial thickness, so that the finally prepared thermal insulation material has a certain thermal insulation effect.

Of course, other man-made or natural fibers, such as: fiber materials such as nylon fibers, acrylic fibers, polypropylene fibers, polylactic acid fibers, and cellulose fibers can also be used as the nonwoven substrate in the embodiments of the present disclosure, and are not limited to polyester fibers.

Xerogels according to embodiments of the present disclosure are formed from a gel that is dried, and the sol from which the gel is prepared may include components such as an organosilicon oxide precursor, a solvent, and a catalyst. In embodiments of the present disclosure, the organosilicon of the organo-silicon oxide precursor includes alkoxysilanes such as: an alkyltrialkoxysilane or a dialkoxysilane, wherein the alkyltrialkoxysilane is selected from the group consisting of Methyltrimethoxysilane (MTMS), vinyltrimethoxysilane (vinyltrimethoxysilane), and combinations thereof, and the dialkoxysilane is diethoxysilane (diethoxysiline), dimethoxysilane (dimethoxysilane), or combinations thereof.

The solvent used for preparing the gel sol is optionally added, and may be selected from alcohols, such as methanol, ethanol, or a combination thereof, but not limited thereto.

As for the catalyst, an acidic catalyst and a basic catalyst are included, wherein the acidic catalyst may be added to the solvent and the organo-silicon oxide precursor to promote the early hydrolysis reaction of the co-condensation process using the acidic catalyst, and the basic catalyst is added after the acidic catalyst to accelerate the condensation reaction to form a gel. In some embodiments, the acidic catalyst may optionally be selected from oxalic acid (oxalic acid), hydrochloric acid (hydrochloric acid), or combinations thereof; the basic catalyst can be selected from ammonia, urea, and combinations thereof, but is not limited thereto.

Sol formulations useful in embodiments of the present disclosure are described, for example, in chem.Mater.2005, Vol.17,2807-2816(Dong et al), chem.Mater.2004, Vol.16, No.11,2041(Loy et al), chem.Mater.2006, Vol.18,541-546(Dong et al), J.Colloid Interface Sci.2006,300,179-285(Rao et al), WO2010080239A2, and the like, which are incorporated herein by reference.

The xerogels of the disclosed embodiments further comprise a cationic surfactant, which may be selected from quaternary ammonium salt surfactants, preferably selected from quaternary ammonium salt surfactants comprising halogen salts, such as: cetyl trimethyl ammonium bromide (hexadecyl trimethyl ammonium bromide), hexadecyl trimethyl ammonium chloride (hexadecyl trimethyl ammonium chloride), benzalkonium bromide (benzalkonium bromide), benzalkonium chloride (benzalkonium chloride), or combinations thereof. The addition of the surfactant can promote the dispersion of the components in the sol, and in the embodiment disclosed in the disclosure, the quaternary ammonium salt surfactant is selected to be more favorable for promoting the polymerization reaction, fixing the dried xerogel structure and enabling the xerogel to have an antibacterial effect.

The methods of making the thermal materials of the embodiments of the present disclosure generally provide a surfactant and a sol that includes a solvent, an organo-silicon oxide precursor, and an acidic catalyst (where the solvent is a selectively added component). In the disclosed embodiment, the surfactant is preferably a cationic surfactant including quaternary ammonium halide salt, and the cationic surfactant and the sol portion are uniformly mixed and then left for a period of time, such as: after 24 hours, the mixture can be hydrolyzed and initially condensed, then alkaline catalyst is added to initiate gel and co-condensation reaction, so that the sol and the cationic surfactant can be co-condensed to form gel, the non-woven substrate is impregnated in the gel, so that the gel is completely distributed on the surface and in the pores of the non-woven substrate, and the non-woven substrate impregnated with the gel is heated and dried under the environmental pressure (for example, 1 atm), so as to obtain the thermal insulation material of the embodiment of the disclosure. In some embodiments, the drying conditions of the gel are 1 atm, temperature 110-.

The weight percentage of the non-woven laminated material in the thermal insulation material prepared by the embodiment of the disclosure is 20-96.7%, the weight percentage of the xerogel is 3-60%, and the weight percentage of the cationic surfactant is 0.3-20%, and the thermal insulation material has good thermal insulation performance, air permeability and antibacterial effect, and has a stable structure. Embodiments of the disclosure are further illustrated by the following examples.

TABLE 1 materials used to make the thermal materials of the examples of the present disclosure

The test mode of each characteristic of the thermal insulation material of the embodiment of the disclosure is described as follows:

thickness measurement

The initial caliper (T0) was measured by caliper gauge at 0.02KPa for a nonwoven substrate of 30cm by 30cm gauge thickness and the caliper measured at 1KPa for a pressed nonwoven substrate was measured as the pressed caliper (T1).

Thickness retention ratio

The thickness retention ratio was 100% of the pressed thickness (T1)/the initial thickness (T0).

Warming effect

The test method uses astm c518 standard test method and the mean value is taken for three tests, represented by Clo (Clo) value.

Warm keeping effect under compression state

Clo (Clo) value obtained when the thermal material to be tested was compressed at a pressure of 1 KPa.

Air permeability

The air permeability is measured and tested by using the GB/T24218.15-2018 national standard textile non-woven fabric test method of the national standards of the people's republic of ChinaThe area is 20cm²The differential pressure was 200 Pa.

Antibacterial effect

Coli (escherichia. coli), Staphylococcus aureus (Staphylococcus aureus), Candida albicans (Candida albicans) were selected using AATCC100 standard test methods. If the bacteria can be inhibited by more than 99.0% in 24 hours, the antibacterial effect is obtained.

Stability of xerogel

Whether the xerogel falls off after the thermal insulation material is finished and in a compressed state is observed by visual observation so as to evaluate the stability of the xerogel attached to the non-woven base material.

Table 2 gel formulations of the experimental examples and comparative examples of the present disclosure

Experimental examples 2, 5-8 and comparative examples 1-2, 5-9 gels were prepared by uniformly mixing an organic silicon oxide precursor, a solvent, an acid catalyst and a cationic surfactant for 30 minutes and then standing for 1 hour, and then uniformly mixing with an alkali catalyst to initiate a gluing and co-condensation reaction to form a gel; experimental example 1 the gel was formed by uniformly mixing an organic silicon oxide precursor, a solvent, an acidic catalyst and a cationic surfactant for 20 minutes, then allowing to stand for 24 hours, then adding a basic catalyst to uniformly mix to start a gluing and co-condensation reaction, and allowing to stand for 24 hours; experimental example 3 was a method in which an organo-silicon oxide precursor, a solvent, an acidic catalyst, water and a cationic surfactant were mixed for 30 minutes, and then a basic catalyst was added and stirred for 30 minutes to form a gel; experimental example 4 was to mix the organic silicon oxide precursor, the solvent, the acidic catalyst and the cationic surfactant for 30 minutes, and then to add the basic catalyst and stir to form a gel.

Table 3, formula of thermal insulation material of each experimental example of the embodiment of the present disclosure

Wherein, the thermal material is prepared by soaking non-woven fibers of each group into the gel, the size, the weight and the use amount of the gel of the non-woven base material are not limited, the non-woven base material can be completely soaked and adsorbed with the gel as the principle, and the non-woven base material with the gel is sent to the extrusion pressure of 5kg/m after the soaking is completely carried out²The press roll of (a) to control the loading of the final gel, and then drying at ambient pressure (i.e., about 1 atm) and 150 c to obtain the final thermal material, wherein the specific gravities of the nonwoven substrate, the xerogel and the surfactant are the weight percentages of the final thermal material.

Table 4, and the warming effect, air permeability and antibacterial effect of each of the experimental examples and comparative examples

Table not tested.

As can be seen from table 4, in the embodiments of the present disclosure, compared with the comparative examples, each unit of the nonwoven substrate has a better thermal insulation effect in a compressed state, and if the comparative examples 5 and 7 are further compared, even though the xerogel is added to the comparative example 7 and the quaternary ammonium salt is contained therein, the antibacterial effect is generated, but the thermal insulation effect of the thermal insulation material in the compressed state is not favorably improved.

Further, as can be seen from comparison of experimental example 2 and comparative example 1, or comparison of experimental example 5 and comparative example 6, when the quaternary ammonium salt component is absent from the xerogel or the ratio of the quaternary ammonium salt is too low, the bonding force between the xerogel and the substrate is affected, and therefore, it is found that the addition of the quaternary ammonium salt to the xerogel contributes to the enhancement of the bonding strength between the xerogel and the substrate, and the ratio of the quaternary ammonium salt is preferably 0.3 to 20%.

As can be seen from the comparison of experimental example 2 and comparative examples 8 and 9, even though the nonwoven substrate has a proper thickness retention rate and a proper quaternary ammonium salt ratio, the xerogel will fall off when the ratio of the nonwoven substrate and the ratio of the xerogel exceed a certain range, that is, the present application found that the ratio of the nonwoven substrate is preferably 20-96.7% and the ratio of the xerogel is preferably 3-60%.

In addition, as can be seen from comparison between the experimental examples and the comparative examples, the addition of the quaternary ammonium salt not only helps the structural stability of the thermal insulation material, but also enables the thermal insulation material to produce an antibacterial effect. As can be seen from experimental example 2 and comparative example 1, the thermal insulation material provided by the method of the embodiment of the present disclosure has better air permeability; as can be seen from the comparison of the groups with similar grammage (experimental example 1 and comparative example 3, experimental example 3 and comparative example 4, and experimental example 4 and comparative example 5), the thermal insulation material prepared by the method of the embodiment of the present disclosure has excellent air permeability, and the addition of the quaternary ammonium salt in a proper proportion also contributes to the improvement of the air permeability of the thermal insulation material (experimental example 2 compared with comparative example 1).

Therefore, the heat-insulating material which can be prepared under the environmental pressure and has good structural stability, good air permeability and an antibacterial effect is provided, and the heat-insulating material still maintains good heat-insulating capability under the condition of being pressed, so that the heat-insulating material is suitable for various products, such as clothes, bedding, shoes and the like. The warm-keeping material disclosed by the embodiment of the disclosure has good air permeability and bacteriostatic ability, still has warm-keeping property in a compressed state, and can be applied to articles such as shoes and socks to achieve the effects of avoiding peculiar smell and considering comfort and warm-keeping property of a user.

The present disclosure has disclosed example embodiments and, although specific terms are employed, they are used and should be interpreted in a generic and descriptive sense only and not for purposes of limitation. In some instances, features, characteristics, and/or elements described in connection with a particular embodiment may be used alone or in combination with features, characteristics, and/or components described in connection with other embodiments, unless expressly stated otherwise, as would be apparent to one skilled in the art. Accordingly, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the disclosure as set forth in the appended claims.