CN110843293A - Fabric with heat dissipation and thermal insulation and preparation method thereof - Google Patents

Abstract

The invention provides a fabric with heat dissipation and heat preservation and a preparation method thereof. The fabric includes a surface layer tissue and a bottom layer tissue woven from different fibers, one end of the surface layer tissue is provided with a coil, and the surface layer tissue moves through the coil and the bottom layer tissue. For connection, the outer side of the surface tissue except the coil is molded with a resin layer to form a composite film. One side of the composite film is coated with a copper coating, and the other side of the composite film is hot stamped with a bronzing layer; when the bronzing layer is outward, the copper When the coating faces inwards, the fabric can reflect the heat radiated by sunlight to achieve the purpose of heat dissipation; when the copper coating faces outwards and the bronzing layer faces inwards, the heat radiated by the fabrics is reduced, and the purpose of heat preservation is achieved; The two sides of the film are respectively coated with copper coating and hot stamped with a hot stamping layer, and a fabric with heat dissipation and heat preservation is prepared, thereby breaking the limitation of a single function of traditional clothing fabrics; the present invention adopts a semi-closed mold to prepare a composite film , the process is unique and novel.

Description

Fabric with heat dissipation and thermal insulation and preparation method thereof

technical field

The invention belongs to the technical field of textile fabrics, and in particular relates to a fabric with heat dissipation and heat preservation and a preparation method thereof.

Background technique

In their paper "A dual-mode textile for human bodyradiative heating and cooling", Po-Chun Hsu and Chong Liu et al. mentioned a double-sided fabric that can not only help the human body cool down, but also help the human body keep warm. This double-sided material mainly includes nano-carbon coating and copper layer, as well as nano-PE films with different thicknesses on both sides. Nano carbon coating has higher infrared emissivity, the material with higher infrared emissivity can radiate more heat in the outer layer and thus has the function of heat dissipation, the copper layer has lower infrared emissivity, and the material with lower infrared emissivity is in the outer layer It can radiate less heat to the outside and has a thermal insulation function. The pore size on the nano PE film is 50-1000nm, which has small absorption and scattering of infrared light, and high infrared transmittance. The small thickness of the nano PE film is conducive to the heat conduction between the human skin and the reflective infrared radiation layer of the fabric, thereby reducing less heat loss. On the contrary, if the thickness of the nano PE film is large, the heat loss will be large, which is conducive to heat dissipation. Experiments have shown that this material can reduce the original 36.9 ℃ simulated human skin to 33.8 ℃. In addition, this fabric was tested after being turned over, and the simulated human skin could be raised to 40.3 °C. The Chinese Patent Publication No. CN108741294A discloses a double-sided fabric with a similar structure and the same function as the fabrics designed by Po-Chun Hsu, Chong Liu et al. It consists of three materials. The upper and lower layers are nanoporous polyethylene substrates. Between the two substrates, there is a double-layer radiation interlayer, which is coated with ultra-low emissivity aluminum powder and ultra-high emissivity transition metals. The composition of oxide ceramic powder coating; the thickness of the nanoporous polyethylene base layer on the side of the ultra-low emissivity aluminum powder coating is 12 μm to 20 μm, the thickness of the formed coating layer is 0.15 μm to 0.25 μm, and the infrared emissivity at room temperature is 0.3 to 0.5; The thickness of the nanoporous polyethylene base layer on the side of the ultra-high emissivity transition metal oxide ceramic powder coating is 25 μm-35 μm, the thickness of the formed coating layer is 25 μm-45 μm, and the room temperature infrared emissivity is 0.91-0.93.

Although the above-mentioned double-sided fabric has certain functions of cooling and heat preservation compared with ordinary fabrics, it also has some problems, such as high material production cost and poor air permeability. It is conditional to enable the cooling mode of the above-mentioned double-sided fabrics. When the above-mentioned fabrics are tested in an environment with strong light, the cooling effect of the fabrics will be weak because the carbon layer will absorb a lot of heat.

SUMMARY OF THE INVENTION

In view of the deficiencies in the prior art, the primary purpose of the present invention is to provide a fabric with heat dissipation and thermal insulation.

The second object of the present invention is to provide a method for preparing the above-mentioned fabric with heat dissipation and thermal insulation.

In order to achieve the above object, the solution of the present invention is:

A fabric with heat dissipation and thermal insulation, which includes surface layer and bottom layer woven by different fibers;

One end of the surface tissue is provided with a coil, and the surface tissue is movably connected to the bottom tissue through the coil;

The outer side of the surface tissue except the coil is molded with a resin layer to form a sheet-like composite film;

One side of the composite film is coated with a copper coating, and the other side of the composite film is stamped with a hot stamping layer.

Further, when the bronzing layer faces outwards and the copper coating faces inwards, the fabric can reflect a large amount of heat radiated by sunlight to achieve the purpose of heat dissipation; Radiant heat to achieve the purpose of thermal insulation.

Further, the surface layer structure is formed by knitting loops, the bottom loop of the surface layer structure is serially wrapped on the bottom layer structure, and the bottom layer structure is a weft knitting structure.

Further, the surface tissue is polypropylene, and the bottom tissue is polyester fiber.

A preparation method of the above-mentioned fabric with heat dissipation and thermal insulation, which comprises the following steps:

(1) Weaving different fibers to obtain the surface layer tissue and the bottom layer tissue respectively, and the surface layer tissue is movably connected with the bottom layer tissue through the coil provided at its end;

(2) A resin layer is molded on the outside of the surface layer structure except the coil to form a sheet-like composite film;

(3), one side of the composite film is coated with a copper coating, and the other side of the composite film is hot-stamped with a bronzing layer, and the composite film, the copper coating and the bronzing layer are hot-rolled into a composite structure; thereby obtaining a heat-dissipating and heat-insulating layer The fabric is finally washed and dried to remove impurities.

Further, in step (2), the mold during molding includes an upper template and a lower template, the size of the lower template is longer than the size of the upper template, and the upper template is embedded in the right-angle groove of the lower template; the upper end of the upper template is provided with a through hole. , the bottom end of the upper template is provided with interconnected grooves and striped grooves, so that the resin infiltrates the surface tissue.

Owing to adopting the above-mentioned scheme, the beneficial effects of the present invention are:

In the present invention, a bronzing layer is stamped on the front of the composite film, and a copper coating is coated on the back of the composite film. When the bronzing layer faces outward and the copper coating faces inward, the fabric can reflect a large amount of heat of solar radiation, so as to achieve The purpose of heat dissipation; when the copper coating faces outward and the bronzing layer faces inward, the heat radiated from the fabric is reduced, and the purpose of heat preservation is achieved. Therefore, the present invention prepares a fabric with heat dissipation and heat preservation, thereby breaking the traditional single fabric for clothing. Functional limitations; in addition, in the preparation method of the present invention, a semi-closed mold is used to prepare the composite film, and the process is unique and novel.

Description of drawings

FIG. 1 is a schematic diagram of the preparation process of the fabric with heat dissipation and thermal insulation of the present invention.

FIG. 2 is a schematic structural diagram of the fabric with heat dissipation and thermal insulation of the present invention.

FIG. 3 is a schematic diagram of the processing variation of the fabric with heat dissipation and thermal insulation of the present invention.

FIG. 4 is a schematic diagram of the effect of the fabric of the present invention in a heat dissipation mode.

FIG. 5 is a schematic diagram of the effect of the fabric of the present invention in the heat preservation mode.

FIG. 6 is a schematic flow chart of knitting the base fabric in the fabric of the present invention.

FIG. 7 is a schematic structural diagram of the mold of the present invention.

FIG. 8 is a schematic structural diagram of the upper template in the mold of the present invention.

FIG. 9 is a schematic diagram of the preparation process of the composite film in the fabric of the present invention.

10 is a schematic diagram of the preparation process of the copper coating in the fabric of the present invention.

Figure 11 is a side view of a coating template and fabric in a facestock of the present invention.

Figure 12 is a top view of the coating template and fabric in the facestock of the present invention.

Reference numerals: 1- bottom layer organization, 2- composite organization, 3- surface layer organization, 4- composite film, 5- copper coating, 6- bronzing layer, 7- upper template, 8- lower template, 9- through hole, 10-Stripe groove, 11-Right angle groove, 12-Groove, 13-Round roll, 14-Paint, 15-Meter roll, 16-Applicator roll, 17-Coating template and 18-Fabric.

Detailed ways

The invention provides a fabric with heat dissipation and heat preservation and a preparation method thereof.

<Fabric with heat dissipation and thermal insulation>

As shown in FIGS. 1 to 3 , the fabric with heat dissipation and heat preservation of the present invention includes a bottom layer 1 and a surface layer 3 woven from different fibers; one end of the surface layer 3 is provided with a coil, and the surface layer 3 passes through the coil and the bottom layer. The tissue 1 is flexibly connected; the outer side of the surface layer tissue 3 except the coil is molded with a resin layer to form a sheet-like composite film 4; the back of the composite film 4 is coated with a copper coating 5, and the front of the composite film 4 is stamped with The hot stamping layer 6 , the composite film 4 , the copper coating 5 and the hot stamping layer 6 become the composite structure 2 after being hot-rolled and composited. In a specific embodiment of the present invention, as shown in FIG. 3 , the surface layer structure 3 is formed by knitting loops and has good air permeability, thereby helping to dissipate heat. Although the surface weave 3 is basically separated from the bottom weave 1, the bottom stitches of the surface weave 3 are set on the bottom weft 1, and the bottom weft 1 is a general weft knitting structure, that is, a mesh structure formed by knitting loops. Breathable and supportive.

When weaving the base fabric, the structure of the surface layer structure 3 should be loose and the number of loops should be less, so that the weight of the composite film 4 will be reduced, and the composite film 4 will also become thinner. If the underfill coefficient of the underlying tissue 1 is set too large, a larger underfill coefficient is conducive to air circulation, and the fabric has a better heat dissipation effect in the heat dissipation mode.

Specifically, polypropylene fiber can be selected for the surface layer structure 3, because it is light in weight, difficult to be polluted and absorbs odor, and polypropylene fiber is dirt-resistant and easy to wash. The bottom tissue 1 can be selected from polyester fibers, that is, woven cross-type polyester fibers. The cross-type polyester fibers have both hygroscopicity and certain wear resistance.

Therefore, in the fabric with heat dissipation and heat preservation of the present invention, the surface layer structure 3 provides a frame structure for the composite film 4, that is, a skeleton, so as to form a film-like structure. The film-like structure has the function of heat dissipation or heat preservation. The bottom tissue 1 covered by the knitted loop is the main support mechanism of the fabric, which has good air permeability and heat dissipation performance.

In fact, the fabric of the present invention has a novel and unique structure, that is, it includes a base weave 1 and a composite weave 2 . The bottom weave 1 is composed of loops interlaced with each other, which is the weft plain knitting structure in knitting. The composite structure 2 has a grid-like structure, and the grid is generally composed of a group of parallel grid bars with an inclination angle of 60-80°. The difference is that the grid bars of the composite structure 2 can be rotated. The bottom of each grid bar of the composite weave 2 is set on the coils of the bottom layer weave 1 by a coil. The overall structure of the grid bar is a composite of yarn, resin, bronzing layer 6 and copper coating 5 . Since the bottom of the grid bar of the composite tissue 2 is not fixed, when the underlying tissue 1 is close to the human body and the fabric changes from a flat surface to a curved surface, the yarn (coil) at the bottom of the grid bar is tensioned, and the angle between the grid bar and the underlying tissue 1 When the size becomes larger, the breathable range of the fabric 18 becomes larger, so as to facilitate air circulation. At the same time, the hot stamping layer 6 made by the hot stamping process above the grid bars can reflect sunlight and reduce the absorption of external heat. By improving the air permeability of the fabric 18 and blocking heat absorption, the effect of the fabric 18 dissipating more heat to the human body in the heat dissipation mode is achieved.

When the underlying weave 1 of the fabric 18 is outward and the grid bars of the composite weave 2 are inward. As people wear clothes made of this kind of fabric, the fabric 18 is changed from a flat surface to a curved surface, and more stress is generated in the yarn, and then the fabric 18 is pressed against the human skin. When the grid bars are pressed to the surface of the human body by the underlying tissue 1, the human skin will also squeeze the grid bars outward, and finally the grid bars are stacked on each other under the pressing action of the underlying tissue 1 and the human skin, and the fabric 18 The air permeability is therefore weakened, and the worse the air permeability, the easier it is to prevent heat loss. In addition, the bronzing layer 6 contains an anodized aluminum layer, which has the function of reflecting infrared rays. When the grid bars are stacked inward, the anodized aluminum layer is close to the human skin and reflects part of the infrared rays radiated by the human body. Take away heat, reduce infrared radiation and reduce heat loss. Although the anodized aluminum layer can reflect the infrared rays radiated by the human body, there is still a large amount of infrared rays radiated from the human body. The copper coating 5 has a very low infrared emissivity, which can further reduce the outward radiation of infrared rays, thereby achieving the effect of reducing heat loss. By squeezing the grid, the air permeability of the fabric is deteriorated, the anodized aluminum layer reflects part of the infrared rays inward, the copper layer reduces part of the infrared rays outward, and the human body radiates outward to enhance the fabric in the heat preservation mode to reduce or slow down more The effect of heat dissipation.

Specifically, when the fabric 18 is in a heat dissipation mode, as shown in FIG. 4 . Since the knitted fabric itself has a certain degree of ductility and elasticity, when a person wears the clothes made of the fabric of the present invention, the clothes are bent from a plane to a curved surface, the originally loose yarns are in a tight state, the composite film 4 is pulled up, and the The gap between them becomes larger. When the human body heats up, the heat radiated to the outside increases, and the heat is transmitted in the form of waves. Because the underlying tissue 1 is made of coils, the holes are large, and the gap between the composite membranes 4 is also large, which is conducive to the outward appearance of the human body. Radiant heat. In addition, sunlight irradiates on the surface of the fabric, and because the bronzing layer 6 on the composite film 4 is on the outside, the anodized aluminum layer on the bronzing layer 6 can reflect a large amount of heat radiated by sunlight and absorb only a small part. Finally, the flow of outside air can cool the human body through the holes between the coils and the gap between the composite films 4, and the water vapor evaporated by the sweat of the human body is easily taken away by the flowing air.

When the fabric 18 is in the keep warm mode, as shown in FIG. 5 . The composite membrane 4 is sandwiched by the clothes and the underlying tissue 1, and the gap between the composite membranes 4 is small, air is not easily circulated, and heat is not easily dissipated. In addition, the anodized aluminum layer has the function of reflecting infrared radiation, and can reflect back part of the heat radiated by the human body. Since the copper coating 5 on the composite film 4 is on the outside, the heat radiated from the fabric 18 is reduced, thereby further reducing the heat loss.

In a specific embodiment of the present invention, as shown in FIG. 3 , the resin and the surface layer structure 3 are molded using a special mold to obtain a composite film 4. During the molding process, it is necessary to ensure that the resin will not cover the bottom coil of the surface layer structure 3. Therefore, It is ensured that the composite membrane 4 can be rotated flexibly, which further facilitates air circulation. The hot stamping hot stamping paper on the front of the composite film 4 is hot-rolled and compounded to become a hot stamping layer 6, and a copper-containing coating is applied on the reverse side (that is, the back side) of the composite film 4 to become a copper coating 5. Due to the low infrared emissivity of copper, Radiated heat energy to the environment can be reduced. As shown in FIG. 4 , when the bronzing layer 6 faces outward and the copper coating 5 faces inward, the fabric has the function of reflecting solar radiation heat energy, and since the composite film 4 is spread out, a certain distance is maintained between each other, and the air is easy to circulate , so as to take away the heat on the surface of people and fabrics to achieve the purpose of heat dissipation. As shown in Figure 5, when the copper coating 5 faces outward and the bronzing layer 6 faces inward, the fabric has the function of reflecting the radiant heat energy of the human body and reducing the radiant heat energy to the outside, thereby achieving the purpose of heat preservation. At this time, the extrusion of the composite film 4 by the underlying tissue 1 of the base cloth and the human body makes the composite film 4 more tightly stacked, air is not easily circulated, and heat is more easily stored to achieve the purpose of heat preservation.

Among them, the bronzing process transfers the aluminum layer in the anodized aluminum to the surface of the substrate, which enhances the folding resistance and toughness of the fabric. The electrical conductivity of the fabric 18 is also very good due to the effect of the aluminum layer, which eliminates the effects of static electricity. In addition, the fabric 18 has high light reflectivity, the aluminum layer can reflect a large amount of radiant heat brought by visible light and part of infrared light, and the aluminum plating can enhance the heat insulation function of the fabric 18 . In addition, the cost of aluminum plating is cheaper than that of nano-carbon coating, and the bronzing technology is mature and easy to promote.

The function of the bronzing layer 6 in the fabric heat dissipation mode is to reflect the heat of solar radiation, and the function of the heat preservation mode is to reflect the heat radiated by the human body. The quality of the bronzing layer 6 is high or low, and the patterns on the surface of the bronzing layer 6 are also varied, and there are many types to choose from in the market. The hot stamping process parameters mainly design the pressure and temperature of the pressing roller or hot stamping plate, as well as the temperature and time of baking in the holding room after hot stamping. The bronzing temperature of ordinary products is between 80-120 ℃. The bronzing pressure should be determined according to the specific product, and the pressure should be as small as possible after confirming the fit. After the hot stamping layer 6 is thermally transferred to the composite film 4, it needs to be sent to a heat preservation room for heat preservation for 6-12 hours, and the heat preservation temperature is between 50-100°C. In addition, the bronzing fabric of the present invention is different from the ordinary bronzing fabric, because the ordinary bronzing fabric is completely covered by the bronzing layer and has poor air permeability. Compared with ordinary partial bronzing fabrics, the fabrics of the same size have better effects of blocking and reflecting sunlight due to the stacking of the composite films 4 on the fabrics of the present invention, while retaining the air permeability of the fabrics 18 .

Specifically, the preparation process of the bronzing layer is:

The fabric after the composite film 4 is made is sent to the hot stamping compound machine, and the corresponding hot stamping glue and hot stamping paper are carried out for hot pressing. After the bronzing is completed, drying is carried out, the drying time is 6-12h, and the drying temperature is 50-100°C.

Among them, the bronzing glue is composed of 10-45 parts of diisocyanate, 35-80 parts of polyester polyol, 1-15 parts of ethylene glycol, 1-25 parts of sodium alginate, 0.05-0.5 parts of dibutyltin dilaurate and other auxiliary agent composition. The auxiliary agents mainly include defoamer and antioxidant, wherein the content of the defoamer is 0.05-2.0% of the total mass of the bronzing glue, and the content of the antioxidant is 0.3-2.5% of the total mass of the bronzing glue. Put polyester polyol and sodium alginate in an oven at 100°C for heating and melting according to the ratio, then dehydrate for 3 hours in a high temperature vacuum environment of about 110°C, take out and stir until the temperature drops to about 75°C, then put in The oven maintains this temperature. Then add ethylene glycol, dibutyltin dilaurate, antifoaming agent and antioxidant according to the formula, and stir for about 1.5h to make the various ingredients mixed evenly. The diisocyanate is subjected to vacuum defoaming treatment and then mixed with the previous components. Finally, it is put into an aluminum barrel to seal, and then the aluminum barrel is placed in an oven, and the temperature is adjusted to 80 °C for 5 hours, and then taken out and cooled to room temperature.

The main components of bronzing paper include polyester film, peeling layer (the main component is silicone resin), color layer (the main component is film-forming, heat resistance, transparency, suitable synthetic resin and dye), anodized aluminum layer, Glue layer (fusible thermoplastic resin). The aluminum layer can reflect the visible light and infrared light emitted by the sun, thereby reducing the absorption of thermal energy, so the bronzing paper has the function of reflecting infrared light and visible light.

The preparation process of copper coating is as follows:

Coating ingredients: polyvinyl chloride resin (referred to as PVC), polyacrylate fabric coating adhesive (referred to as PA coating adhesive), polyurethane coating adhesive (referred to as PU coating adhesive), copper powder and other additives.

Primer coating formulation and preparation: 90-110 parts of PA coating adhesive, 2-3 parts of polyisocyanate crosslinking agent, 4-7 parts of ethyl acetate, and appropriate amount of toluene. First add ethyl acetate to the polyisocyanate crosslinking agent and mix thoroughly, then add it to the PA coating adhesive and stir, add toluene while stirring to adjust the viscosity to 7000-11000mPa·s, stir well and let stand for 40min.

PVC coating coating formulation and preparation: 90-110 parts of PVC resin prepared by emulsion method, 40-60 parts of dioctyl phthalate, 40-60 parts of dibutyl phthalate, 0.5-60 parts of zinc stearate 1 part, barium stearate 0.5-1.0 parts, calcium stearate 1-2 parts. First add a small amount of plasticizer (dioctyl phthalate and dibutyl phthalate) to the stearate (zinc stearate, barium stearate and calcium stearate), stir well, then Pour it into the mixer together with the PVC resin, then add the remaining plasticizer, and grind it with a three-roller mill for 3-4 times after mixing.

PU copper paste coating formulation and preparation: 40-60 parts of one-component polyurethane, 8-15 parts of copper powder paste, 20-40 parts of methyl ethyl ketone, and 3-6 parts of N,N-dimethylformamide. The particle size of the copper powder particles is 400-1200 mesh. Low mesh has good hiding power and strong gloss. However, if the mesh number is too low, the covering power will decrease due to uneven coating. Add part of the solvent to the copper powder slurry, stir evenly, then add the polyurethane glue, add the remaining solvent while stirring, adjust the viscosity to 4000-8000mPa·s, and let it stand for 40min.

Auxiliaries mainly include dithiocarbamate and rosin salt. Dithiocarbamate acts as an antifungal agent to prevent microorganisms from growing on the surface of the coating film, thereby making the coating film dirty and even degrading the coating film. As a drier, rosin salt can accelerate the curing speed of the coating film. Additives account for about 0.01-5% of the total weight of the coating.

Technological process: First, use the paint composed of PA coating glue as the primer, control the temperature of the front area of the oven to be 60-90 °C, the temperature of the rear area to be 100-130 °C, and the drying time to be 40s. Then carry out PVC coating, control the oven temperature to be 180-200°C, and the plasticizing time to be 3-4min. The fabric after PVC coating is cooled and rolled. Finally, PU copper paste coating is carried out, and the temperature of the oven in the front area is controlled to be 120-140°C, the temperature of the rear area is 140-160°C, and the drying time is 40-50s.

<Preparation method of fabric with heat dissipation and heat preservation>

The innovation of the process method of the invention is that by improving the mold in the manufacturing method of the molded composite material, the closed mold is changed to a semi-closed mold to realize the compounding of the surface layer tissue with one end sleeved on the underlying tissue to form a resin and yarn. composite membrane. Then, the two sides of the composite film are subjected to bronzing treatment and coating treatment respectively through a special template.

As shown in Figure 1, the preparation method of the fabric with heat dissipation and thermal insulation of the present invention comprises the following steps:

(1), different fibers are weaved to obtain surface layer tissue 3 and bottom layer tissue 1 respectively, and the surface layer tissue 3 is movably connected with the bottom layer tissue 1 through the coil provided at its end;

(2) The outer side of the surface layer structure 3 except the coil is molded with a resin layer to form a sheet-like composite film 4;

(3), be coated with copper coating 5 on the back of composite film 4, be hot stamped with bronzing layer 6 on the front of composite film 4, and become composite organization 2 after composite film 4, copper coating 5 and bronzing layer 6 are hot rolled ; Thereby a fabric with heat dissipation and heat preservation is obtained, and finally the impurities are removed by washing and drying.

Specifically, in step (1), the computerized flat knitting machine has two needle beds, and the two needle beds can work at the same time and work independently, and the double-layer knitted fabric is woven by using this characteristic, and there is a local part between the layers. Fabrics that are connected, integral and spaced apart from each other. The surface layer structure 3 is given special functions by compounding, and the coil underfill coefficient of the bottom layer structure 1 is set too large, which is easy for air circulation. When knitting the base fabric on the computerized flat knitting machine, at the beginning, both the front needle bed and the rear needle bed are hooked and looped, and then the front needle bed and the rear needle bed are alternately hooked and looped. At this time, each row of needle beds is equipped with A sand mouth, a total of two sand mouths are needed. After the surface weave 3 is knitted to the designed length, the front needle bed is stitched and the stitch is no longer knitted, and the rear needle bed continues to be knitted. Finally, the front needle bed and the rear needle bed are simultaneously drawn out and hooked to form a loop, and enter a new knitting cycle.

Specifically, the knitting process of the flat knitting machine is shown in Fig. 6. When the fabric is knitting the first row of stitches, the front needle bed and the rear needle bed of the flat knitting machine are simultaneously drawn out, and then the yarn is bent to form a loop. When knitting the 2nd row of stitches, the needles from the front needle bed of the flat knitting machine and the stitches from the back needle bed are only bent to form a loop, and the stitches knitted by the front needle bed of the 1st row are wrapped around the stitches formed by the 2nd row. superior. When knitting the 3rd row of stitches, the front needle bed of the flat knitting machine does not have needles, and the rear needle bed gives out needles, and the yarn is only bent on the rear needle bed to form a loop. superior. When knitting the 4th row of stitches, needles are drawn from the front needle bed of the flat knitting machine, and no needles are drawn from the back needle bed, and the yarn is only bent on the front needle bed to form a loop, and the loop knitted by the front needle bed of the second row is wrapped around the loop formed by the fourth row. superior. When knitting the 5th row of stitches, needles are released from the front needle bed of the flat knitting machine, and no needles are released from the rear needle bed, but no yarn is provided to the needles. In this way, the stitches of the front needle bed will be separated from the needle bar, and the stitches of the rear needle bed will remain on the needle bar for subsequent knitting. The above five-row knitting motion knits a unit of fabric 18 . The fabric 18 required by the present invention can be woven by repeating the above-mentioned steps. This fabric 18 includes a bottom weave 1 and a surface layer weave 3. The bottom weave 1 is composed of loops that are interlocked with each other, and is a weft plain knitting structure in knitting. The surface tissue 3 is discontinuous, but each unit is wrapped around the underlying tissue 1 by the coils at the bottom of the unit.

In step (2), as shown in FIG. 7 , the die during molding includes an upper die plate 7 and a lower die plate 8, the size of the lower die plate 8 is longer than the size of the upper die plate 7, and the inner part of the lower die plate 8 is provided with a right-angle groove 11 , the upper template 7 can be embedded in the right-angle groove 11 of the lower template 8 , or the upper template 7 can move in the right-angle groove 11 of the lower template 8 . As shown in FIGS. 7 and 8 , a through hole 9 is provided in the middle of the upper end of the upper die plate 7 , a stripe groove 10 is provided at the bottom end of the upper die plate 7 , and grooves 12 are provided between the stripe grooves 10 . The striped grooves 10 and grooves 12 at the bottom of the upper template can evenly send the resin to the surface of the fabric 18, and at the same time, the upper template 7 moves in parallel in the right-angle groove 11 of the lower template 8, and the upper template 7 and the lower template 8 are squeezed. As a result, the resin infiltrates the surface tissue 3 and covers the surface tissue 3 at the same time, but the resin does not cover the coils at the bottom of the surface tissue 3, and finally, the resin solidifies to form a film-like structure. That is, the resin reaches the bottom of the upper template 7 through the through holes 9 of the upper template 7 , and then the resin infiltrates the surface tissue 3 through the grooves 12 and striped grooves 10 at the bottom of the upper template 7 and solidifies into a film, that is, the composite film 4 is obtained.

In addition, the surface layer structure 3 of the base cloth will have a curling phenomenon, which is not conducive to the use of conventional molds for molding. The upper template 7 moves in parallel in the right-angle groove 11, and the surface layer structure 3 with curling phenomenon is flattened on the lower template 9. inside the right-angle groove 11 , which is beneficial to the uniform formation of the composite film 4 . Since the lower template 8 adopts a right-angle template, in order to prevent the resin from overflowing the mold, the angle between the lower template 8 and the horizontal plane can be set within 120-160°.

The specific molding process is as follows: the surface layer structure 3 can be regarded as a whole composed of separate units. When the fabric 18 is supported by the round rollers 13, the gaps between the elements of the surface weave 3 are enlarged. The upper and lower templates clamp a unit of the surface tissue 3 , and the resin is injected through the through hole 9 of the upper template 7 and immersed into the unit of the surface tissue 3 . After the resin and the yarn are mixed evenly, the upper die plate 7 moves in the groove of the lower die plate 8, and the resin is injected again to make the yarn not submerged by the resin for the first time and the resin compound. The number of times of movement of the upper template 7 is determined according to the size of each unit of the surface tissue 3 . Finally, except that the connecting part of the surface layer structure 3 and the bottom layer structure 1 is not covered by the resin, the rest part is combined with the resin to form a uniform composite film 4 . After a composite film 4 is made, the upper template 7 and the lower template 8 exit the work area. The fabric 18 is controlled by the winding device and the feeding device to move. The movement of the fabric 18 drives the round roller 13 to move, and the movement of the round roller 13 reduces the friction on the surface of the fabric 18. After the unit of the next superficial tissue 3 arrives at the work area, the upper template 7 and the lower template 8 enter the work area, clamp this unit of the superficial tissue 3, and repeat the above process.

In step (3), as shown in FIG. 10 , the copper coating process is: after the composite film 4 is formed, the coating 14 controlled by the metering roller 15 evenly falls on the coating template 17, because the coating template 17 is in the middle is empty (as shown in Figures 11 and 12), so part of the coating 14 will fall on the surface of the composite film 4, and then as the coating roller 16 rotates, the composite film 4 and the coating template 17 move forward, and are simultaneously The coating roll 16 is pressed so that the coating material 14 is uniformly covered in the surface area of the composite film 4 .

In step (3), the front surface of the composite film 4 is treated with aluminum-coated bronzing paper, and the whole process includes four links: gluing, hot-rolling and compounding, heat preservation and film stripping.

Specifically, glue is partially coated on the back of the bronzing layer 6 , and the bronzing layer 6 is bonded to the front surface of the composite film 4 , and the glue is applied to bond with the composite film 4 . Where there is glue, the bronzing layer 6 will be transferred to the composite film 4, and where there is no glue, the bronzing layer 6 will not be transferred to the composite film 4. After the glue is applied, the composite film 4 and the bronzing layer 6 are still not well combined, and need to be squeezed by two hot pressing rollers. The fabric that has just been hot-rolled and laminated still needs to be kept warm for several hours, mainly for the better lamination of the bronzing layer 6 to the composite film 4 . Finally, the fabric is passed through a peeling machine to peel off the PET film on the surface.

Since various impurities will be generated during the preparation of the fabric, it needs to be washed and dried to remove the impurities. The process of washing and drying: put the fabric into water with a temperature of about 60-90 ℃, add a certain amount of detergent, and after ordinary washing for about 15 minutes, rinse with water and add softener. Then take out the fabric and put it in the oven to dry. Among them, the detergent includes 5-10wt% ester quaternary ammonium salt, 0.5-1wt% thickener (sodium chloride), 0.1-0.5wt% essence, 0.05-0.4wt% preservative (o-phenylphenol) and 85 -90wt% water, softener includes 35-50wt% paraffin oil, 3-6wt% stearic acid, 3-6wt% glyceryl stearate, 2-5wt% leveling agent (sulfonated oil), 4-6wt% Triethanolamine and 30-40 wt% water.

The present invention will be further described below in conjunction with the examples.

Example:

The preparation method of the fabric with heat dissipation and thermal insulation of the present embodiment includes the following steps:

(1) Weaving polypropylene and polyester fibers to obtain surface tissue and underlying tissue respectively, and the surface tissue is movably connected to the underlying tissue through the coil provided at its end;

(2), flow the softened thermoplastic polyurethane elastomer to the bottom end of the upper template through the through holes of the upper template, and infiltrate and place it in the surface layer structure of the lower template except for the coil, and obtain a sheet-like composite film after molding. ;

(3), adopt copper-containing paint to coat on the back of composite film, obtain copper coating;

(4), on the front side of the composite film, the bronzing paper of the aluminized layer is used to carry out the processing of gluing, hot-rolling compounding, heat preservation and film stripping to obtain a bronzing layer; the composite film, the copper coating and the bronzing layer become a composite structure after compounding, Thereby, the fabric with heat dissipation and heat preservation is obtained, and finally it can be washed and dried for many times.

The foregoing description of the embodiments is provided to facilitate understanding and use of the present invention by those of ordinary skill in the art. It will be apparent to those skilled in the art that various modifications to these embodiments can be readily made, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art according to the principles of the present invention without departing from the scope of the present invention should all fall within the protection scope of the present invention.

Claims (6)

1. The utility model provides a surface fabric with heat dissipation and heat preservation which characterized in that: the fabric comprises a surface layer tissue and a bottom layer tissue which are woven by different fibers;

one end part of the surface layer tissue is provided with a coil, and the surface layer tissue is movably connected with the bottom layer tissue through the coil;

the outer side of the surface layer tissue except the coil is molded with a resin layer to form a sheet-shaped composite film;

one side of the composite film is coated with a copper coating, and the other side of the composite film is thermoprinted with a gold stamping layer.

2. The fabric with the functions of heat dissipation and heat preservation according to claim 1, characterized in that: when the gold stamping layer faces outwards and the copper coating layer faces inwards, the fabric can reflect a large amount of heat of solar radiation, so that the purpose of heat dissipation is achieved;

when the copper coating layer faces outwards and the gold stamping layer faces inwards, the heat radiated outwards by the fabric is reduced, and the purpose of heat preservation is achieved.

3. The fabric with the functions of heat dissipation and heat preservation according to claim 1, characterized in that: the surface layer structure is formed by serially sleeving knitting coils, and the bottom layer structure is a weft knitting structure.

4. The fabric with the functions of heat dissipation and heat preservation according to claim 3, characterized in that: the surface layer tissue is polypropylene fiber, and the bottom layer tissue is polyester fiber.

5. A method for preparing the fabric with heat dissipation and heat preservation functions according to any one of claims 1 to 4, wherein the method comprises the following steps: which comprises the following steps:

(1) weaving different fibers to respectively obtain a surface layer tissue and a bottom layer tissue, wherein the surface layer tissue is movably connected with the bottom layer tissue through a coil arranged at the end part of the surface layer tissue;

(2) the outer side of the surface layer tissue except the coil is molded with a resin layer to form a sheet-shaped composite film;

(3) one side of the composite film is coated with a copper coating, the other side of the composite film is thermoprinted with a gold stamping layer, and the composite film, the copper coating and the gold stamping layer are hot-rolled into a composite structure; thereby obtaining the fabric with heat dissipation and heat preservation.

6. The method of claim 5, wherein: in the step (2), the die during die pressing comprises an upper die plate and a lower die plate, the size of the lower die plate is longer than that of the upper die plate, and the upper die plate is embedded into a right-angle groove of the lower die plate; the upper end of the upper template is provided with a through hole, and the bottom end of the upper template is provided with a groove and a stripe groove which are mutually connected, so that the resin is soaked into the surface tissue.

Images