CN217997648U

CN217997648U - Breathable cooling knitted fabric and garment

Info

Publication number: CN217997648U
Application number: CN202122894801.5U
Authority: CN
Inventors: 宋理; 陈邦
Original assignee: Shenzhen Deep Space Refrigeration Technology Co ltd
Current assignee: Shenzhen Deep Space Refrigeration Technology Co ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2022-12-09
Anticipated expiration: 2031-11-23

Abstract

The application provides a ventilative cooling knitted fabric and clothing, ventilative cooling knitted fabric include the looped fabric body, set up the radiation cooling layer on the looped fabric body and set up the polyurethane enhancement layer on the radiation cooling layer. The breathable cooling knitted fabric has good radiation cooling effect, air and moisture permeability and waterproof performance, has good wearability, and can meet higher clothing requirements of people.

Description

Breathable cooling knitted fabric and garment

Technical Field

The application relates to the field of garment fabric preparation, in particular to breathable cooling knitted fabric and garment.

Background

Along with the development of society, the outdoor activity time of people is increasing day by day, and the performance requirement of people on the clothes fabric is also continuously improved. When the outdoor environment temperature is higher, sunlight irradiates the surface of the traditional fabric for clothes to enable the fabric to generate heat, so that the human body can easily discharge sweat and generate stuffy feeling, and the wearing experience of people is influenced. Therefore, it is necessary to provide a fabric with good cooling effect and air and moisture permeability to meet the higher requirement of people.

SUMMERY OF THE UTILITY MODEL

In view of this, the application provides a breathable cooling knitted fabric, the breathable cooling knitted fabric has a laminated structure of knitted fabric body/radiation cooling layer/polyurethane enhancement layer, can have better radiation cooling effect and air and moisture permeability concurrently, and can satisfy higher clothing demand of people.

In a first aspect, the present application provides a breathable cooling knitted fabric, the breathable cooling knitted fabric includes a knitted fabric body, a radiation cooling layer disposed on the knitted fabric body, and a polyurethane reinforcing layer disposed on the radiation cooling layer.

In the embodiment of the application, the radiation cooling layer comprises a resin matrix and radiation cooling particles embedded in the resin matrix.

In an embodiment of the present invention, the resin matrix has a constant force elongation of 50% to 400%, the knitted fabric body has a constant force elongation of 1% to 7%, and the resin matrix has a constant force elongation greater than or equal to the constant force elongation of the knitted fabric body.

In an embodiment of the present application, the polyurethane reinforcing layer includes a polyurethane matrix and reinforcing particles embedded in the polyurethane matrix.

In an embodiment of the present application, the hardness of the polyurethane reinforcing layer is greater than the hardness of the radiation cooling layer.

In the embodiment of the application, the radiation cooling layer has a micropore structure, and the pore diameter of micropores is 0.01-15 μm; the polyurethane enhancement layer has a porous structure, and the pore size of the pores is 0.01-15 μm.

In the embodiment of the application, the particle size of the radiation cooling particles is 0.2-4 μm; 2g-60g of the radiation cooling particles are embedded in each square meter of the radiation cooling layer.

In an embodiment of the present application, the reinforcing particles have a particle size of 20nm to 60nm.

In the embodiment of the application, the thickness of the radiation cooling layer is 2-50 μm; the thickness of the polyurethane reinforced layer is 0.1-50 μm; the total thickness of the radiation cooling layer and the polyurethane reinforcing layer is 2.1-100 mu m.

In the embodiment of the application, the air permeability value of the air permeable cooling knitted fabric is greater than or equal to 1.8mm/s.

In the embodiment of the application, the total solar energy blocking rate of the breathable cooling knitted fabric is greater than or equal to 84%.

The breathable cooling knitted fabric provided by the first aspect of the application has the functions of radiation cooling and breathability and moisture permeability, and has better wearability.

The present application further provides a garment comprising the breathable cooling knitted fabric of the first aspect of the present application.

Drawings

FIG. 1 is a schematic structural view of a breathable cooling knitted fabric in an embodiment of the present application;

FIG. 2 is a schematic view of the principle of radiation cooling of the breathable cooling knitted fabric in the embodiment of the present application;

fig. 3 is a schematic structural diagram of a garment in an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.

Referring to fig. 1, the present embodiment provides a breathable cooling knitted fabric 100, which includes a knitted fabric body 10, a radiation cooling layer 20 disposed on the knitted fabric body 10, and a polyurethane reinforcing layer 30 disposed on the radiation cooling layer 20. In practical use, one side of the knitted fabric body 10 of the breathable cooling knitted fabric 100 is close to a human body and is an inner side of the fabric, and one side of the polyurethane reinforcing layer 30 is exposed in the environment and is an outer side of the fabric.

The breathable cooling knitted fabric 100 provided by the embodiment of the application has a laminated structure of a knitted fabric body/a radiation cooling layer/a polyurethane enhancement layer, and the laminated structure can enable the fabric to obtain good radiation cooling effect and good breathable moisture-permeable performance, so that the wearability of the fabric is improved, and the wearing experience of people is improved. The radiation cooling layer can better reflect visible light, infrared light and the like, and emit heat through the atmospheric window in an infrared radiation mode, so that the breathable cooling knitted fabric has a good radiation cooling effect.

In the embodiment of the present application, the knitted fabric body 10 is a fabric formed by bending yarns into loops and stringing and sleeving yarns, and can be divided into warp knitting fabric and weft knitting fabric, and the fabric has a certain elasticity, a mesh structure is loose, and a ventilation channel is sufficient. The knitted fabric body 10 may include, but is not limited to, a interlock fabric, a rib fabric, and a mesh fabric. In some embodiments of the present application, the knitted fabric body 10 may be nylon, polyester, cotton-polyurethane, etc.

In the embodiment of the present application, the radiation cooling layer 20 includes a resin matrix 21 and radiation cooling particles 22 embedded in the resin matrix 21, and the radiation cooling particles 22 are uniformly distributed in the resin matrix 21. Because the looped fabric body has more loose mesh structure, be difficult for taking place to block up and cause the decline of looped fabric body air permeability because of ventilative mesh, consequently this application embodiment directly sets up radiation cooling layer 20 on looped fabric body 10, is located between looped fabric body 10 and the polyurethane enhancement layer 30.

In the present embodiment, the radiation cooling layer 20 has a microporous structure, that is, the resin matrix 21 has a microporous structure, and the radiation cooling particles 22 are uniformly dispersed in the microporous resin matrix 21. The pore diameter of the micropores of the radiation cooling layer 20 may be 0.01 μm to 15 μm, and specifically, may be, for example, 0.01 μm, 0.02 μm, 0.05 μm, 0.1 μm, 0.2 μm, 0.5 μm, 1 μm, 2 μm, 5 μm, 10 μm, 15 μm, or the like. In the present embodiment, the density of the micropores in the radiation cooling layer 20 may be about 15 hundred million micropores per square centimeter of the radiation cooling layer. The air permeability and the moisture permeability of the fabric can be better improved by the proper pore size range and the proper number of micropores.

In the embodiment of the present application, the resin matrix 21 may be a polyurethane matrix or another kind of porous resin matrix. In the present application, the resin matrix 21 not only serves as a dispersion carrier for the radiation cooling particles 22, but also provides air permeable pores to ensure that the radiation cooling layer 20 has good air and moisture permeability. The resin matrix is used as a dispersion carrier of the radiation cooling particles, so that the structure of the radiation cooling layer after solidification is more stable, and the fabric is favorable for keeping a more stable radiation cooling effect. And the resin matrix has better stretching capacity, can be matched with the micro-elasticity property of the knitted fabric body, and forms better combination with the knitted fabric body, thereby being beneficial to preventing the radiation cooling layer from being broken or degummed due to the stretching deformation of the knitted fabric body. In the embodiment of the present application, the resin matrix 21 may have a constant force elongation of 50% to 400%, specifically 50%, 100%, 150%, 200%, 250%, 300%, 350%, 400%, etc., and the knitted fabric body 10 may have a constant force elongation of 1% to 70%, specifically 1%, 2%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, etc., and the constant force elongation of the resin matrix may be greater than or equal to the constant force elongation of the knitted fabric body. The constant force elongation refers to an elongation generated when the fabric is subjected to a predetermined tensile force. In addition, the resin matrix has a micropore structure, so that air molecules and gaseous water molecules in the air can also permeate through micropores of the radiation cooling layer, and the radiation cooling layer is prevented from blocking permeation of hot air and moisture in the fabric, so that the fabric is favorable for having radiation cooling effect and good air permeability and moisture permeability.

In the embodiment of the present application, the radiation cooling particles 22 mainly play a role in radiation cooling in the radiation cooling layer 20, where radiation cooling means that the radiation cooling particles can reflect visible light, infrared light, and the like in sunlight, and penetrate through the atmosphere through an atmospheric window in an infrared radiation manner to emit heat, thereby resulting in cooling. Specifically, referring to fig. 2, sunlight a irradiates the fabric with a full spectrum, the sunlight a penetrates through the polyurethane reinforcing layer 30 to reach the radiation cooling layer 20, and further irradiates the radiation cooling particles 22 in the radiation cooling layer 20, the radiation cooling particles 22 can reflect part of rays B in the sunlight, the rays B include visible light and infrared light, and the heat C is emitted through an atmospheric window with a wave band of 8 μm to 13 μm to reach the cooling effect of the fabric by means of infrared radiation through the atmospheric layer 201.

In the present application, the radiant cooling particles 22 include particles that are capable of reflecting sunlight and emitting heat through an atmospheric window in an infrared radiation manner resulting in cooling. In some embodiments, the radiant cooling particles 22 may specifically include one or more of silicon dioxide, silicon carbide, titanium dioxide, calcium carbonate, barium sulfate, silicon nitride, zinc oxide, aluminum oxide, iron oxide, zirconium dioxide, and jade powder. In some embodiments, the radiant cooling particles 22 can be a mixture of two or more of silicon dioxide, silicon carbide, titanium dioxide, calcium carbonate, barium sulfate, silicon nitride, zinc oxide, aluminum oxide, iron oxide, zirconium dioxide, and jade powder. In the application, the radiation cooling particles 22 are uniformly dispersed in the resin matrix 21, and the radiation cooling effect of the fabric can be more uniform due to the uniform dispersion of the radiation cooling particles 22, so that the wearing experience of a human body is improved; in addition, the more uniformly the radiation cooling particles 22 are dispersed, the smoother the surface of the radiation cooling layer is, and the smoother the surface of the fabric is, so that the improvement of the reflectivity to sunlight is facilitated, and the cooling effect of the fabric is better.

In the embodiment of the application, the size of the radiation cooling particles 22 has certain influence on the radiation cooling effect generated by the radiation cooling particles, the particle size of the radiation cooling particles 22 is controlled in a proper range, so that the radiation cooling layer is smoother, the improvement on the reflection capability of sunlight is facilitated, the reflection capability of infrared light in a wave band of 8-13 mu m in the sunlight is improved, and the radiation cooling layer can exert a better radiation cooling effect. In the embodiment of the present application, the particle size of the radiant cooling particles 22 may be controlled to be 0.2 μm to 4 μm, and specifically may be 0.2 μm, 0.5 μm, 1 μm, 2 μm, 3 μm, 4 μm, and the like. The specific shape of the radiant cooling particles 22 is not limited, and can be, for example, spherical, ellipsoidal, rod-like, etc. In addition, the size of the radiation cooling particles 22 also has a certain influence on the air permeability of the fabric, and in the embodiment of the present application, the particle size of the radiation cooling particles can be adjusted within the particle size range of the radiation cooling particles according to the structural characteristics of the fabric selected by the knitted fabric body 10, specifically, the looser the fabric structure selected by the knitted fabric body is, the radiation cooling particles with larger particle size can be selected; on the contrary, the more compact the fabric structure that the knitted fabric body chose for use, the less radiation cooling granule of optional particle size.

In this application, the radiation cooling particle content on the unit area of the radiation cooling layer 20 can also influence the radiation cooling effect to a certain extent. Too low a content of the radiation cooling particles may cause a reduction in the reflection capability of the radiation cooling layer 20 to sunlight (including visible light, infrared light, and the like), and further cause an unsatisfactory radiation cooling effect of the fabric. In order to make the radiant cooling layer exert a good radiant cooling effect, the radiant cooling particles 22 are added to the radiant cooling layer 20 in unit area as sufficient as possible in the embodiment of the present application. However, since the amount of visible light, infrared light, and the like reflected by the radiation cooling particles 22 per unit area is limited, the excessive addition of the radiation cooling particles may reduce the effective utilization rate of the radiation cooling particles, thereby causing waste of the radiation cooling particles and increase of the fabric manufacturing cost. In addition, the excessive addition of the radiation cooling particles can also have adverse effects on the comprehensive performance of the fabric, on one hand, the excessive content of the radiation cooling particles in a unit area can reduce the combination degree of the radiation cooling layer 20 and the knitted fabric body 10 and the polyurethane reinforcing layer 30 positioned on the two sides of the radiation cooling layer, so that the structural stability of the fabric is poor, the fabric is easy to break in the use process, and the service life of the fabric is further influenced; on the other hand, the too large addition amount of the radiation cooling particles in unit area may increase the dispersion difficulty of the radiation cooling particles in polyurethane, and agglomeration is easy to occur, thereby affecting the air and moisture permeability of the radiation cooling layer. In the embodiment of the present application, the content of the radiation cooling particles in each square meter of the radiation cooling layer 20 is optionally controlled to be 2g to 60g, and specifically, the content of the radiation cooling particles in each square meter of the radiation cooling layer 20 may be controlled to be 2g, 5g, 10g, 15g, 20g, 25g, 30g, 35g, 40g, 45g, 50g, 55g, 60g, and the like. The radiation cooling particles on the unit area are controlled in the proper range, so that the fabric can obtain better radiation cooling performance, the effective utilization rate of the radiation cooling particles is improved, the radiation cooling layer can have more microporous structures to keep the air permeability of the fabric, the structural stability of the fabric is enhanced, and the fabric can obtain better comprehensive performance in the aspects of radiation cooling, air permeability, moisture permeability, structural stability and the like.

It should be noted that, in specific application, because the loosening degree and the raw material characteristics of different knitted fabric bodies are different, the content requirements of different fabrics on the radiation cooling particles in unit area are also different, and therefore, the specific addition amount of the radiation cooling particles in unit area can be adjusted within the above range according to the specifically selected fabric.

In the embodiment of the present application, a side of the radiation cooling layer 20 away from the knitted fabric body 10 is provided with a polyurethane reinforcing layer 30, and the polyurethane reinforcing layer 30 includes a polyurethane matrix 31 and reinforcing particles 32 embedded in the polyurethane matrix 31. The polyurethane reinforcing layer 30 has a microcellular structure.

In the embodiment of the present application, the reinforcing particles 32 are added to the polyurethane reinforcing layer 30, which is beneficial to ensuring that the fabric realizes better air permeability and moisture permeability. Specifically, the outermost layer needs to be subjected to calendaring treatment in the preparation process of the fabric, the calendaring treatment is heat treatment, and the process easily causes the damage of the microporous structure of the outermost layer to influence the air permeability and moisture permeability of the fabric; on the other hand, because the polyurethane enhancement layer 30 is transparent or translucent layer, the sunlight can see through the polyurethane enhancement layer 30 and reach the radiation cooling layer 20, consequently the setting of polyurethane enhancement layer 30 is difficult for causing adverse effect to its radiation cooling function of normal performance of radiation cooling layer 20 to be favorable to making the surface fabric obtain better radiation cooling effect simultaneously, can also guarantee better ventilative moisture permeability, and then be favorable to making the wearability of surface fabric obtain better promotion. In addition, the polyurethane reinforcing layer 30 arranged on the outermost layer of the fabric can also prevent the radiation cooling layer 20 from being damaged due to external factors such as abrasion and the like in the use process of the fabric to influence the radiation cooling function of the radiation cooling layer 20, so that the radiation cooling layer 20 is protected to a certain extent. And because the polyurethane enhancement layer 30 after the press polish treatment has a smoother surface, the arrangement of the polyurethane enhancement layer is not only beneficial to improving the reflectivity to sunlight and enabling the fabric to obtain a better cooling effect, but also beneficial to enabling the fabric to obtain a certain waterproof effect and a better appearance, and has a better hand feeling.

In the present embodiment, the reinforcing particles 32 may be high-hardness particles including silica particles. The particle size of reinforcing particles 32 is 20nm to 60nm. Specifically, the particle size of the reinforcing particles 32 may be 20nm, 30nm, 40nm, 50nm, 60nm.

In the embodiment of the present application, in order to better enable the polyurethane reinforcing layer 30 to have a structure that maintains the microcellular structure during the calendering process, the hardness of the polyurethane reinforcing layer 30 is controlled to be greater than that of the radiant cooling layer 20. Specifically, the hardness of the polyurethane reinforcing layer 30 can be adjusted according to the requirement of pressure-resistant polishing treatment, and the polyurethane reinforcing layer 30 can maintain a porous structure during the pressure-resistant polishing treatment, i.e., the polishing treatment, so that the polyurethane reinforcing layer has good air permeability. In some embodiments, the polyurethane reinforcing layer 30 may have a hardness 1 or more times greater than the hardness of the radiant cooling layer 20.

In the present embodiment, the porous pore size of the polyurethane reinforcing layer 30 may be 0.01 μm to 15 μm. In a specific embodiment, the porous pore size of the polyurethane reinforcing layer 30 may be 0.01 μm, 0.02 μm, 0.05 μm, 0.1 μm, 0.2 μm, 0.5 μm, 1 μm, 2 μm, 5 μm, 10 μm, 15 μm, or the like. In the present example, the polyurethane reinforcing layer 30 contains about 15 hundred million cells per square centimeter.

In the present embodiment, the air permeability of the fabric means the air permeability of the fabric when a pressure difference exists between both sides of the fabric, that is, the volume of air flowing per unit area of the fabric per unit time at a predetermined pressure difference between both sides of the fabric. Because the size and the density of the micropores can influence the volume of air flowing through the unit area of the fabric in unit time, the size and the density of the micropores are controlled in a proper range, so that the fabric can obtain better air permeability. In the embodiment of the application, the radiation cooling layer and the polyurethane enhancement layer on the fabric ventilation channel are both provided with a micropore structure, and the pore diameter of each micropore is controlled to be 0.01-15 mu m, so that the pore diameter is far larger than the diameter of air molecules by 0.3-0.4 nm, and therefore, the air molecules can penetrate through the micropores more easily, and the ventilation speed is higher. In addition, as the diameter of the gaseous water molecule in the air is 0.4nm, the diameter of the gaseous water molecule is also far smaller than the pore diameter of the micropores in the embodiment of the application, the air holes which can allow the air molecules to penetrate through can also allow the gaseous water molecule in the air to penetrate through, that is, the micropore structure in the application can simultaneously have the functions of air permeability and moisture permeability. In the embodiment of the present application, the pore diameters of the micro-pores of the radiation cooling layer and the polyurethane reinforcing layer may be substantially the same or different. In one embodiment of the application, the pore diameters of the micropores of the radiation cooling layer and the polyurethane enhancement layer are close, so that the air and moisture permeability of the fabric can be realized. In another embodiment of the present application, in consideration of the fact that the volume of the gas is increased due to the fact that the gas is likely to be liquefied when the hot gas emitted from the human body in the higher temperature environment passes through the fabric through the radiation cooling layer and the polyurethane reinforcing layer, the pore diameter of the micropores of the radiation cooling layer is smaller than that of the micropores of the polyurethane reinforcing layer, which is beneficial to better realizing the air permeability and moisture permeability of the fabric.

In this application embodiment, according to the different application demands of ventilative cooling knitted fabric, also have different requirements to the thickness of each coat of surface fabric and the gross thickness in coat, the thickness in each coat and the gross thickness in coat too big or undersize all can influence the cooperation between each coat, and then influence the radiation cooling effect and the ventilative moisture permeability of surface fabric. The thickness of this application embodiment through with each coating and the gross thickness control of coating in suitable within range, can guarantee that the surface fabric is carrying out under the condition of thickness adjustment according to actual demand, still can have better radiation cooling effect and ventilative moisture permeability. The thickness of the radiation cooling layer can be controlled to be 2 μm-50 μm, specifically 2 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 50 μm, etc. The thickness of the polyurethane reinforcing layer can be controlled to be 0.1 μm to 50 μm, and specifically can be 0.1 μm, 0.2 μm, 0.5 μm, 1 μm, 2 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 50 μm, and the like. The total thickness of the coating layer can be controlled to be 2.1 μm to 100 μm, that is, the total thickness of the radiation cooling layer and the polyurethane reinforcing layer can be controlled to be 2.1 μm to 100 μm, and specifically can be 2.1 μm, 5 μm, 10 μm, 20 μm, 40 μm, 50 μm, 70 μm, 80 μm, 100 μm, and the like.

The breathable cooling knitted fabric 100 in the embodiment of the application can have good breathable moisture-permeable performance while exerting a good radiation cooling effect by mutually matching the knitted fabric body 10, the radiation cooling layer 20 and the polyurethane reinforcing layer 30.

Specifically, each layer in the breathable cooling knitted fabric structure is in cooperation with the function of breathable moisture permeation, and the knitted fabric body, the radiation cooling layer and the polyurethane enhancement layer are of appropriate microporous structures, and due to the specific structure of the breathable cooling knitted fabric, the breathable cooling knitted fabric is divided into an inner side and an outer side, one side of the knitted fabric body is the inner side of the breathable cooling knitted fabric, one side of the polyurethane enhancement layer is the outer side of the breathable cooling knitted fabric, and air molecules and gaseous water molecules in the air can flow to the outer side from the inner side of the knitted fabric in the direction perpendicular to the thickness of the knitted fabric, so that the breathable moisture permeation function of the knitted fabric is realized. The breathable cooling knitted fabric can be used as a garment fabric, the inner side of the fabric is the side contacting with a human body, the outer side of the fabric is the side deviating from the human body, and under a high-temperature environment, the fabric can achieve good radiation cooling, ventilation and perspiration functions, so that stuffiness and sense of heat of a user can be reduced, and good garment performance is shown. In addition, due to the specific laminated structure of the radiation cooling fabric, moisture is difficult to reversely permeate through the fabric, namely, the moisture is difficult to flow from the outer side of the fabric to the inner side of the fabric, so that the radiation cooling fabric also has a certain waterproof effect. In the embodiment of the application, the air permeability value of the air permeable cooling knitted fabric is greater than or equal to 1.8mm/s. In some embodiments, the breathable cooling knit fabric has a breathability value of greater than or equal to 1.9mm/s. In some embodiments, the breathable cooling knit fabric has a breathability value of greater than or equal to 2.0mm/s. In some embodiments, the breathable cooling knit fabric has a breathability value of greater than or equal to 2.1mm/s. In the embodiment of the application, the moisture permeability value of the breathable cooling knitted fabric is greater than or equal to 18000 g/(m) ² *24h)。

In this application, each layer in ventilative cooling knitted fabric 100 can make the coating obtain more stable structure after the polyurethane solidification in radiation cooling layer and the polyurethane enhancement layer in the coating in the concrete main performance of cooperation in the effect of performance radiation cooling, thereby the homodisperse state of radiation cooling granule in polyurethane also can obtain better stability, be favorable to making the stable effect of performance radiation cooling of radiation cooling granule, and the radiation cooling granule that is in stable structure is difficult for taking place to drop or caking and leads to the radiation cooling effect of radiation cooling granule to reduce or become invalid, be favorable to improving the effective utilization ratio of radiation cooling granule. In addition, the polyurethane enhancement layer that sets up and keep away from looped fabric body one side on the radiation cooling layer can make the structure of coating more stable except can solidifying the back, can also prevent that the radiation cooling layer from causing the destruction and influencing its radiation cooling function because of external factors such as wearing and tearing in the surface fabric use to can make the surface fabric have certain waterproof effect, thereby play the effect to the further protection of radiation cooling layer, be favorable to improving the effective life on radiation cooling layer. The breathable cooling knitted fabric can play a better radiation cooling effect under stronger sunlight irradiation, and in the embodiment of the application, the total solar blocking rate of the breathable cooling knitted fabric is greater than or equal to 84% at the ambient temperature of 303.15K, specifically, 84%, 85%, 86%, 87%, 88%, 89%, 90% and the like. Namely, the solar energy transmittance of the breathable cooling knitted fabric is less than or equal to 16 percent. The total solar blocking ratio refers to the ratio of the blocked solar energy (mainly visible light, infrared light and ultraviolet light) to the total solar energy irradiated on the surface of an object. In the embodiment of the application, the sunlight reflectance of the breathable cooling knitted fabric 100 is greater than or equal to 77%; a visible light reflectance of 82% or more; the infrared reflectance is 74% or more. The breathable cooling knitted fabric can realize temperature reduction through thermal insulation, and the effect of radiation cooling is achieved. In the embodiment of the application, the irradiation is carried out at a high temperature of 30-40 ℃ for more than 15min, so that the surface temperature of the breathable cooling knitted fabric can be reduced by 3-10 ℃, specifically by 3 ℃, 4 ℃, 5 ℃, 6 ℃, 7 ℃, 8 ℃, 9 ℃, 10 ℃ and the like.

The breathable cooling knitted fabric provided by the embodiment of the application can have good radiation cooling effect, air permeability, moisture permeability and waterproof performance, has good wearability, and can meet the higher clothing demand of people.

The embodiment of the application also provides a preparation method of the breathable cooling knitted fabric, which comprises the following steps:

(1) Coating a radiation cooling material on the knitted fabric body, and curing to obtain a radiation cooling layer;

(2) And coating a polyurethane reinforcing layer material on the radiation cooling layer, and curing and calendaring to obtain the breathable cooling knitted fabric.

The curing process can be realized by drying, and the drying temperature can be 40-60 ℃. The calendering treatment is the post treatment of the fabric, the calendering treatment can make the surface of the fabric smoother and the whole fabric denser, and the temperature in the calendering treatment process can be controlled to be 50-160 ℃.

In this application embodiment, select for use the looped fabric as the cloth of looped fabric body, range upon range of coating radiation cooling layer and polyurethane enhancement layer on the looped fabric body in proper order. In this application embodiment, with radiation cooling granule homodisperse in can forming the resin matrix raw materials of microporous structure, obtain the radiation cooling layer material, can form the radiation cooling layer that inlays the radiation cooling granule that is equipped with homodisperse after coating this radiation cooling layer material on the looped fabric body and drying the solidification. In some embodiments, the resin matrix material may be a polyurethane material.

In the embodiment of the application, the dispersion liquid containing the reinforcing particles is uniformly dispersed in the polyurethane raw material capable of forming the microporous structure to obtain the polyurethane reinforcing layer material, and then the polyurethane reinforcing layer material is coated on the cured radiation cooling layer and dried and cured to form the polyurethane reinforcing layer with the microporous structure. The dispersion liquid containing the reinforcing particles can be butyl acetate dispersion liquid containing the reinforcing particles, and the hardness of the polyurethane can be obviously improved by adding the dispersion liquid, so that the polyurethane reinforcing layer can resist the calendaring treatment.

In this application embodiment, strike off and dry the coating of solidification processing back and carry out the polyurethane enhancement layer again through the radiation cooling layer after to the coating, be favorable to obtaining the surface fabric that has better radiation cooling effect and ventilative moisture permeability. The coated radiation cooling layer is subjected to strickle treatment, so that on one hand, the combination degree between the radiation cooling layer and the polyurethane reinforcing layer is better, and the structural stability of the formed coating layer is higher, so that the problem that the effective service life of the fabric is influenced due to the falling off of the coating layer in the use process of the fabric is favorably prevented; on the other hand, the radiation cooling layer and the polyurethane reinforcing layer can have smoother surfaces, so that the fabric of the coating layer can obtain smoother surfaces. And carry out the coating of polyurethane enhancement layer again after drying the solidification treatment to the radiation cooling layer after the coating and be favorable to preventing that each layer material from taking place to mix between layer to layer, forming the transition layer of mixing state, the constitution and the structure of this transition layer are relatively unstable, probably exert an influence to mutually supporting between radiation cooling layer and the polyurethane enhancement layer, and then influence the radiation cooling effect and the ventilative moisture permeability of surface fabric. Specifically, the microporous structures of the transition layer relative to the radiation cooling layer and the polyurethane reinforcing layer may change, which affects the circulation of gas between the layers, and further affects the air and moisture permeable functions of the fabric. The dispersion state of the transition layer relative to the radiation cooling particles of the radiation cooling layer may also change, which affects the effective utilization rate of the radiation cooling particles and further affects the radiation cooling effect of the fabric.

In this application embodiment, the coating thickness of each layer can be adjusted through the distance of treating between the coating surface of adjustment scraper blade and last layer, for example the coating thickness of radiation cooling layer can be adjusted through the distance of adjusting between the scraper blade and the surface of treating coating of looped fabric body, and the coating thickness of polyurethane enhancement layer can be adjusted through the distance of adjusting between the scraper blade and the surface of treating coating of radiation cooling layer.

The preparation method provided by the application is simple to operate and easy to realize.

Referring to fig. 3, the present application also provides a garment 200 comprising the breathable cooling knitted fabric described above. Namely, garment 200 has a laminated structure of panels 100. When the garment is worn, one side of the knitted fabric body of the breathable cooling knitted fabric is close to a human body, one side of the polyurethane enhancement layer is exposed in the environment, and the garment has a good radiation cooling effect and breathable moisture-permeable performance, so that the wearing experience of the human body can be improved.

Embodiments of the present application are further illustrated below in the various examples.

Example 1

A preparation method of breathable cooling knitted fabric comprises the following steps:

(1) Coating a radiation cooling material on the knitted fabric body, and drying and curing to obtain a radiation cooling layer; wherein, each square meter of radiation cooling layer contains 10g of radiation cooling particles;

(2) And coating a polyurethane reinforcing layer material on the radiation cooling layer, drying, curing and performing calendaring treatment. Obtaining the breathable cooling knitted fabric with the laminated structure of the knitted fabric body, the radiation cooling layer and the polyurethane reinforcing layer.

Example 2

A preparation method of a breathable cooling knitted fabric, which is different from the embodiment 1 only in that: in the step (2), each square meter of the radiation cooling layer contains 20g of radiation cooling particles.

Example 3

A preparation method of a breathable cooling knitted fabric, which is different from the preparation method of the embodiment 1 only in that: in the step (2), each square meter of radiation cooling layer contains 35g of radiation cooling particles.

Example 4

A preparation method of a breathable cooling knitted fabric, which is different from the embodiment 1 only in that: in the step (2), 48g of radiation cooling particles are contained on each square meter of radiation cooling layer.

In order to highlight the beneficial effects of the application, the following comparative examples are arranged:

comparative example 1

The difference from example 1 is that: the knitted fabric only comprises a knitted fabric body.

Comparative example 2

The difference from example 1 is that: the knitted fabric only comprises a knitted fabric body and a radiation cooling layer, and does not comprise a polyurethane enhancement layer, and the knitted fabric has a laminated structure of the knitted fabric body/the radiation cooling layer.

Comparative example 3

The only difference from example 1 is: each square meter of the radiant cooling layer contains 1g of radiant cooling particles.

Comparative example 4

The only difference from example 1 is: each square meter of the radiant cooling layer contains 65g of radiant cooling particles.

In order to highlight the beneficial effects of the examples of the present application, the fabrics of examples 1 to 4 and comparative examples 1 to 4 were tested for cooling performance and air and moisture permeability, and the test results are shown in table 1 below.

The detection conditions of the cooling performance and the air and moisture permeability are as follows: the environment temperature is 303.15K, and the convection heat release coefficient is 10W/m ² * K, atmospheric mass AM1.5, atmospheric pressure 100Pa.

TABLE 1 test results of cooling performance, air permeability and moisture permeability of fabrics

As can be seen from the results in table 1, under the same sunlight irradiation condition, the knitted fabric of the embodiment of the present application has a laminated structure of the knitted fabric body/the radiation cooling layer/the polyurethane reinforcing layer, so that the fabric has a high sunlight reflectance ratio, wherein the reflectance ratios of visible light and infrared light in sunlight can both reach a high level, the total solar blocking rate can reach above 84%, and the air permeability value and the moisture permeability value of the fabric are also significantly improved. Promptly the ventilative cooling knitted fabric in this application embodiment can have better radiation cooling effect and ventilative moisture permeability concurrently.

Compared with the examples 1-4, the comparative example 1 only comprises the knitted fabric body, and a good radiation cooling effect cannot be obtained due to the lack of the radiation cooling layer. In comparative example 2, the polyurethane reinforcing layer is absent, that is, the radiation cooling layer is the outermost layer of the fabric, and the microporous structure of the radiation cooling layer may be damaged after the calendaring treatment, so that the air permeability and moisture permeability of the fabric are reduced. Therefore, the fabrics with good radiation cooling effect and air and moisture permeability cannot be obtained in the comparative examples 1 and 2.

Compared with examples 1-4, in comparative example 3, the radiation cooling particles contained on the radiation cooling layer per square meter are too few to fully reflect sunlight, so that the total solar energy blocking rate of the fabric is low, and the radiation cooling effect is not obvious. In the comparative example 4, the radiation cooling particles contained in the radiation cooling layer per square meter are too many, so that micropores in the radiation cooling layer are difficult to form good air permeable channels, and the air and moisture permeability of the fabric is not ideal. Therefore, the fabrics with good radiation cooling effect and air and moisture permeability can not be obtained in the comparative examples 3 and 4.

Claims

1. The breathable cooling knitted fabric is characterized by comprising a knitted fabric body, a radiation cooling layer arranged on the knitted fabric body and a polyurethane reinforcing layer arranged on the radiation cooling layer, wherein the radiation cooling layer has a microporous structure, the pore diameter of each micropore is 0.01-15 mu m, the polyurethane reinforcing layer has a porous structure, and the pore diameter of each pore is 0.01-15 mu m.

2. The breathable cooling knit fabric of claim 1 wherein the polyurethane reinforcing layer has a hardness greater than the hardness of the radiant cooling layer.

3. The breathable cooling knit fabric of claim 1 wherein the radiant cooling layer has a thickness of from 2 μm to 50 μm; the thickness of the polyurethane reinforced layer is 0.1-50 μm.

4. The breathable cooling knitted fabric of claim 1, wherein the radiation cooling layer and the polyurethane reinforcing layer have a total thickness of 2.1 μm to 100 μm.

5. The breathable cooling knit fabric of claim 1 having a breathability value of greater than or equal to 1.8mm/s; the total solar energy blocking rate of the breathable cooling knitted fabric is greater than or equal to 84%.

6. A garment comprising the breathable cooling knit fabric of any one of claims 1 to 5.