Multi-layer composite pad with lasting cool feeling function and preparation method of multi-layer composite pad

Abstract

The invention provides a multi-layer composite pad with a lasting cool feeling function and a preparation method of the multi-layer composite pad, and relates to the technical field of textile articles. Comprising a surface layer, a middle layer and a bottom layer, the surface layer is a cool-feeling fiber fabric, the middle layer is a cool-feeling printing non-woven fabric implanted with PCM phase change microcapsules, and the bottom layer is a three-dimensional net-shaped supporting base material; the surface layer, the middle layer and the bottom layer are connected in a quilting or high-frequency hot pressing mode, and therefore an integrated composite structure is formed. The surface-layer cool-feeling fiber fabric ensures rapid cooling response during initial contact, the middle-layer PCM phase-change microcapsules achieve slow release of cooling capacity through the phase-change characteristic, heat dissipation assistance of the bottom-layer breathable channel is matched, the cool feeling duration time is greatly prolonged, cool feeling distribution is uniform, and a user can enjoy lasting and comfortable cooling experience without frequently moving the contact part.

Description

Technical Field

[0001] This invention relates to the technical field of textile products, specifically to a multi-layer composite mat with a long-lasting cooling function and its preparation method. Background Technology

[0002] In the textile industry, cooling mats, as a common home product in summer, are widely used in sleeping and resting scenarios due to their rapid cooling properties when in contact with the human body, becoming a key home item for improving user comfort. Currently, most cooling mats on the market use a surface layer of cooling fabric, with a backing layer of sponge, synthetic fiber, or similar cushioning material, forming a cooling surface and a cushioning bottom layer. The cooling effect of these products relies entirely on the surface cooling fabric, essentially a design using a single cooling material. The cooling sensation is transmitted instantly upon contact with the body through the thermal conductivity of the surface fabric or cooling additives, without any other auxiliary cooling structures or mechanisms. For example, common cooling mattresses and sofa cushions use this structure, with a surface layer of cooling polyester or bamboo fiber fabric and a bottom layer of ordinary sponge, relying solely on the surface fabric for cooling transmission. However, the cooling effect of a single-layer material made solely of surface-contact cooling fabric is short-lived due to the lack of a single source of cooling and a mechanism for storing and slowly releasing cooling substances. The cooling effect often disappears quickly within a few hours of contact with the human body as heat accumulates and reaches thermal equilibrium. Furthermore, the cooling components of the surface cooling fabric are easily volatilized and lost through friction or washing, resulting in a rapid decline in the cooling effect and an inability to maintain a stable cooling experience over a long period.

[0003] Therefore, the present invention provides a multilayer composite pad with a long-lasting cooling function and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multilayer composite pad with a long-lasting cooling function and its preparation method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a multi-layer composite pad with a long-lasting cooling function, comprising a top layer, a middle layer and a bottom layer sequentially laminated from top to bottom; The outer layer is a cooling fiber fabric, the middle layer is a cooling printed nonwoven fabric with PCM phase change microcapsules implanted, and the bottom layer is a three-dimensional mesh support substrate. The surface layer, intermediate layer, and bottom layer are connected by quilting or high-frequency hot pressing to form an integrated composite structure.

[0006] By leveraging the phase-change heat absorption properties of the PCM microcapsules in the middle layer, combined with the cooling sensation of the surface layer and the breathable heat dissipation of the bottom layer, the duration of the cooling sensation is significantly extended, solving the pain points of existing technologies such as short-lived cooling and frequent heat reabsorption. The three-layer integrated composite structure prevents layer displacement, and together with the three-dimensional mesh substrate at the bottom layer, it greatly improves compressive strength, reduces deformation after repeated use, and its structural stability far exceeds that of traditional products. The three-layer structure forms a three-dimensional breathable channel, effectively increasing air permeability, preventing stuffiness and sweat buildup during use, and enhancing the comfort experience.

[0007] In a preferred embodiment, the cooling fiber fabric of the surface layer is at least one of cotton, linen, bamboo fiber, polyester, or nylon, and the basis weight of the surface layer is 120-180 g / m². 2 .

[0008] The technical advantages of adopting the above-mentioned further solutions are: by selecting specific cooling fiber fabrics, the rapid cooling experience upon initial contact is enhanced, resulting in a superior cooling response speed. A reasonable weight range balances fabric softness and structural strength, meeting the wear-resistance requirements of daily use, and maintaining its good shape even after multiple washes.

[0009] In a preferred embodiment, the PCM phase change microcapsules in the intermediate layer have a particle size of 3-10 μm, and the coating amount of the PCM phase change microcapsules on the nonwoven fabric is 20-40 g / m². 2 The basis weight of the intermediate layer is 80-120 g / m³. 2 .

[0010] The technical advantages of adopting the above-mentioned further solutions are: suitable microcapsule particle size ensures uniform dispersion, and with reasonable coating amount and intermediate layer weight, slow release of cooling energy is achieved, with controllable and stable duration of cooling sensation. Specific particle size and weight matching printing process effectively improves microcapsule fixation rate, reduces loss of cooling substances during washing, and ensures that good cooling effect is maintained even after long-term use.

[0011] In a preferred embodiment, the underlying three-dimensional mesh support substrate is a sandwich mesh fabric, and the basis weight of the underlying substrate is 150-220 g / m². 2 Compressive strength ≥ 3.5 MPa.

[0012] The technical advantages of adopting the above-mentioned further solutions are as follows: the three-dimensional mesh structure of the sandwich mesh fabric provides strong support, and with a reasonable weight and compressive strength design, it can withstand long-term compression without easily deforming, thus extending the product's service life. The mesh structure forms air convection channels, improving breathability and heat dissipation performance, and in synergy with the PCM microcapsules in the middle layer, it can maintain a comfortable temperature even after long-term use.

[0013] A method for preparing a multilayer composite pad with a long-lasting cooling function includes the following steps: S1. Prepare the surface layer by selecting polyester or polyester-nylon blended fiber fabric, and then dyeing or printing it to obtain a surface-contact cooling fabric. S2. Prepare the intermediate layer by using PCM microcapsule coating and printing it onto the nonwoven fabric substrate. After drying, a cool-feeling printed nonwoven fabric is obtained. S3. Prepare the bottom layer by selecting sandwich mesh fabric and bleaching or dyeing it to obtain a three-dimensional mesh support substrate. S4. Stack the prepared surface layer, intermediate layer and bottom layer in order from top to bottom, and fix them together by quilting or high-frequency hot pressing. The quilting stitch spacing is 8-12 stitches / 10cm, the high-frequency hot pressing temperature is 120-150℃, the pressure is 0.3-0.6MPa and the time is 10-30s. S5. Cut the composite fabric to the preset product size. S6. Bind and sew the edges of the cut fabric to obtain the finished multi-layer composite pad.

[0014] By employing both quilting and high-frequency hot pressing processes, different production needs can be met. The composite three-layer structure is tightly bonded, free from defects such as bubbles and scorching, resulting in a higher production qualification rate.

[0015] In a preferred embodiment, the solid content of the PCM microcapsule coating is 30-50 wt%, and the printing process is blade printing or roller printing, with a drying temperature of 80-100℃ and a drying time of 3-8 min.

[0016] The technical advantages of adopting the above-mentioned further solutions are as follows: the coating solids content ensures a balance between fluidity and concentration; combined with the printing process using a doctor blade and rollers, the microcapsules are evenly distributed on the nonwoven fabric, avoiding uneven distribution of cooling sensation in certain areas. The drying temperature and time settings ensure microcapsule fixation while preventing high temperatures from damaging the PCM phase change performance, and the drying efficiency is far higher than traditional natural air drying methods. The combination of printing technology and drying parameters effectively improves the coating peel strength; the coating is less prone to peeling after multiple washes, resulting in superior durability.

[0017] In a preferred embodiment, the polyester or polyester-nylon blended fabric has a fiber fineness of 1.2-2.0 dtex, a warp breaking strength ≥300 N / 5 cm, and a weft breaking strength ≥250 N / 5 cm.

[0018] The technical effects of adopting the above-mentioned further solutions are as follows: Fine denier fibers increase the specific surface area, improving the speed of coolness conduction, allowing for rapid cooling upon initial contact and alleviating the feeling of heat. The increased warp and weft tensile strength ensures the fabric is less prone to tearing during lamination, cutting, and use, extending product lifespan. Fine denier fiber fabrics also exhibit better dyeing uniformity and printability, resulting in clearer printed patterns, better colorfastness, and reduced fading and yellowing after washing.

[0019] This invention provides a multilayer composite pad with a long-lasting cooling function and its preparation method. It has the following beneficial effects: By achieving a cooling sensation upon initial contact with the surface layer, providing continuous heat absorption in the middle layer, and ensuring breathability and heat dissipation in the bottom layer, this product completely solves the core pain points of traditional cooling products: short-lived cooling effect and easy reheating. The surface cooling fiber fabric ensures a rapid cooling response upon initial contact, while the PCM phase change microcapsules in the middle layer achieve a slow release of cold energy through phase change properties. Combined with the heat dissipation assistance of the bottom breathable channels, this significantly extends the duration of the cooling sensation, and the cooling effect is evenly distributed, allowing you to enjoy a long-lasting and comfortable cooling experience without frequently moving the contact area.

[0020] The three-layer integrated composite structure is firmly connected through quilting or high-frequency hot pressing processes, preventing delamination and displacement. The bottom three-dimensional mesh support substrate provides strong structural support, effectively improving the product's compressive strength and shape stability, making it less prone to deformation or collapse over long-term use. The three-layer structure forms a three-dimensional breathable channel, effectively increasing breathability and preventing stuffiness and sweat buildup. Combined with the soft, cool-feeling fiber fabric on the surface, it greatly enhances user comfort. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a multi-layer composite pad with a long-lasting cooling function provided by the present invention.

[0022] Legend: 1. Surface layer; 2. Middle layer; 3. Bottom layer. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] I. Materials Unless otherwise specified, all methods used in this invention are conventional methods known to those skilled in the art, and all reagents and materials used are commercially available products.

[0025] II. Methods Example 1 like Figure 1 As shown, in this embodiment, a multi-layer composite pad with a long-lasting cooling function is prepared by a quilting composite process; First, a 100% polyester fiber fabric was selected, with a fiber fineness of 1.5 dtex, a warp breaking strength of 320 N / 5 cm, and a weft breaking strength of 270 N / 5 cm. Reactive dyes were used for dyeing at room temperature and pressure with a liquor ratio of 1:10 for 40 minutes. Following this, the fabric underwent pre-drying at 100℃ for 5 minutes, and then a setting treatment at 160℃ for 30 seconds. The resulting finished product had a weight of 150 g / m². 2 The cooling sensation upon contact is 0.35 W / cm. 2 Cooling fiber fabric surface layer 1; Secondly, the preparation of the intermediate layer 2 of the cool-feeling printed nonwoven fabric implanted with PCM phase change microcapsules, using materials with a basis weight of 60 g / m². 2 Polypropylene nonwoven fabric with a fiber diameter of 2.0 μm and a porosity of 75%; The core material is n-octadecane, the phase change temperature is 28℃, the latent heat of phase change is 210J / g, the wall material is melamine-formaldehyde resin, the particle size is 5μm, and the encapsulation rate is ≥90% of the PCM phase change microcapsules.

[0026] Preparation: PCM phase change microcapsules and aqueous acrylate emulsion were mixed at a mass ratio of 1:1. The solid content of the PCM phase change microcapsules was 40 wt%, and the solid content of the aqueous acrylate emulsion was 45 wt%. 0.5 wt% dispersant and 0.3 wt% defoamer were added, and the mixture was stirred at high speed for 30 min until homogeneous. The PCM phase change microcapsules were then implanted into polypropylene nonwoven fabric using a doctor blade printing process. The doctor blade angle was 45°, the printing speed was 3 m / min, and the coating amount was 30 g / m². 2 The product was dried in a 90℃ hot air oven for 5 minutes to obtain a finished product with a weight of 100g / m³. 2 The middle layer of the cool-feeling printed nonwoven fabric with implanted PCM phase change microcapsules having a microcapsule fixation rate of ≥95%; Then, a polyester fiber sandwich mesh fabric is selected. The upper layer is a plain weave structure woven from 15D polyester yarn, the middle layer is a vertical support structure woven from 30D polyester yarn, and the lower layer is a plain weave structure woven from 15D polyester yarn. After bleaching, the oxygen bleaching process uses 3wt% hydrogen peroxide and 1wt% sodium hydroxide, treated at 80℃ for 60 minutes. The finished product has a basis weight of 180g / m². 2 The compressive strength is 3.8 MPa, and the air permeability is 800 L / m². 2 •s, to obtain the bottom layer 3 of the three-dimensional mesh support substrate; Finally, the top layer 1, middle layer 2, and bottom layer 3 are prepared using a composite process: Top layer 1, middle layer 2, and bottom layer 3 are stacked in order from top to bottom and composited using a computerized quilting machine. The quilting pattern is a diamond pattern, with a stitch length of 10 stitches / 10cm, a stitch density of 3 stitches / cm, and the sewing tension controlled at 0.8-1.2N. 40S / 2 polyester-cotton thread is used to ensure a tight fit and no shifting of the three layers. The composite fabric is cut to a size of 150cm × 200cm, and the edges are overlocked using polyester-cotton binding strips with a binding width of 1.5cm and a stitch length of 8 stitches / 10cm. The finished edge is guaranteed to be flat and free of loose threads, resulting in a multi-layer composite pad.

[0027] Example 2 like Figure 1 As shown, the multi-layer composite pad with a long-lasting cooling function in this embodiment is prepared by a high-frequency hot-pressing composite process; First, a polyester-nylon blend of 70% and 30% was selected, with a fiber fineness of 1.2 dtex, a warp tensile strength of 350 N / 5 cm, and a weft tensile strength of 290 N / 5 cm. Cooling-sensitive patterns were printed digitally at a resolution of 1200 dpi. After pre-baking and setting treatment at 90℃ for 3 minutes and 150℃ for 20 seconds, the finished product weighed 120 g / m². 2 Cooling value: 0.38 W / cm 2 , thus obtaining the surface layer 1 of the cool-feeling fiber fabric; Secondly, the preparation of the intermediate layer 2 of the cool-feeling printed nonwoven fabric implanted with PCM phase change microcapsules, using materials with a basis weight of 50 g / m². 2 The viscose nonwoven fabric has a fiber diameter of 1.5μm and a porosity of 80%; the core material is n-hexadecane, the phase change temperature is 26℃, the latent heat of phase change is 200J / g, the wall material is urea-formaldehyde resin, the PCM phase change microcapsules have a particle size of 3μm and an encapsulation rate of ≥92%. Preparation: PCM microcapsules and aqueous polyurethane emulsion were mixed at a mass ratio of 1:1.2. The solid content of the PCM microcapsules was 35 wt%, and the solid content of the aqueous polyurethane emulsion was 50 wt%. 0.4 wt% dispersant and 0.2 wt% defoamer were added, and the mixture was stirred until homogeneous. Roller printing was used to embed the microcapsules into viscose nonwoven fabric. The roller pressure was 0.2 MPa, the printing speed was 5 m / min, and the coating amount was 25 g / m². 2 Dry at 85℃ for 6 minutes to obtain a finished product with a weight of 80 g / m³. 2 The middle layer 2 of the cool-feeling printed nonwoven fabric with implanted PCM phase change microcapsules having a microcapsule fixation rate of ≥96%; Then, polyester fiber sandwich mesh fabric is selected, dyed to dark gray, and the finished product has a weight of 150g / m². 2 The compressive strength is 3.5 MPa, and the air permeability is 750 L / m³.2 •s, to obtain the bottom layer 3 of the three-dimensional mesh support substrate; Finally, the top layer 1, middle layer 2, and bottom layer 3 are stacked and sent into a high-frequency hot press. The hot pressing temperature is set to 130℃, the pressure to 0.4MPa, and the hot pressing time to 20s. The hot pressing pattern is a dot array (5mm in diameter and 10mm in spacing). This ensures that the composite fabric is free of bubbles and scorching. The fabric is cut to a size of 90cm×150cm and sewn with elastic binding strips. The stitch length is 9 stitches / 10cm. The finished thickness is 2.2cm, and the flatness error is ≤±0.1cm, resulting in a multi-layer composite pad.

[0028] Example 3 like Figure 1 As shown, this embodiment of a multi-layer composite pad with a lasting cooling function is prepared by a quilting and high-frequency hot-pressing composite process; First, a blended fabric was selected, consisting of 30% bamboo fiber and 70% polyester. The fiber was virgin bamboo pulp fiber with a fineness of 2.0 dtex, a warp breaking strength of 330 N / 5 cm, and a weft breaking strength of 260 N / 5 cm. The fabric was then dyed and set with reactive dyes at 155℃ for 25 seconds, resulting in a finished product with a weight of 180 g / m². 2 The cooling sensation value is 0.32 W / cm². 2 Cooling fiber fabric surface layer 1. Secondly, the preparation of the intermediate layer 2 of the cool-feeling printed nonwoven fabric implanted with PCM phase change microcapsules, using materials with a basis weight of 70 g / m². 2 The nonwoven fabric is made of polyester with a fiber diameter of 2.5μm and a porosity of 70%; the core material is n-nonadecane with a phase change temperature of 30℃ and a latent heat of phase change of 220J / g; the wall material is polyurea resin with a particle size of 10μm and an encapsulation rate of ≥88%; Preparation: PCM microcapsules and aqueous epoxy resin emulsion were mixed at a mass ratio of 1:0.8. The solid content of the PCM microcapsules was 50 wt%, and the solid content of the aqueous epoxy resin emulsion was 40 wt%. 0.6 wt% dispersant and 0.4 wt% defoamer were added, and the mixture was stirred until homogeneous. The mixture was then implanted into polyester nonwoven fabric via doctor blade printing, with a coating amount of 40 g / m². 2 Dry at 100℃ for 3 minutes to obtain a finished product with a weight of 120 g / m³. 2 2. Cooling printed nonwoven fabric with implanted PCM phase change microcapsules with a microcapsule fixation rate of ≥94% as the intermediate layer. Then, a thickened sandwich mesh fabric is selected. This thickened sandwich mesh fabric has a three-layer structure, with the middle layer having a fiber diameter of 0.2mm. After dyeing, the finished product has a weight of 220g / m². 2 Compressive strength 4.2MPa, air permeability 900L / m³ 2•s, to obtain the bottom layer 3 of the three-dimensional mesh support substrate; Finally, the surface layer 1, middle layer 2, and bottom layer 3 are prepared using a quilting and high-frequency hot pressing composite process. First, the surface layer 1, middle layer 2, and bottom layer 3 are fixed by quilting with a stitch spacing of 8 stitches / 10cm. Then, local high-frequency hot pressing is performed for reinforcement, with a temperature of 140℃, a pressure of 0.5MPa, and a time of 15s, to ensure the firmness of the edges and stress-bearing parts. The material is cut to a size of 180cm×220cm, double-layered with 2cm binding, and the finished product is 2.8cm thick. It can be repeatedly folded 500 times without deformation, resulting in a multi-layered composite pad.

[0029] Comparative Example 1 Comparative Example 1 is a traditional single-layer cooling mat, consisting only of a surface cooling fabric, without a middle or bottom layer. The fabric used is the same polyester cooling fabric as in Example 1, with a weight of 150g / m². 2 Cooling sensation value: 0.35 W / cm 2 The fabric was cut directly to a size of 150cm×200cm, and the edges were bound and sewn to form a single-layer pad with a thickness of 0.8cm. Performance testing: The duration of the cooling sensation is 8 minutes from contact with a simulated human body temperature of 36°C to below 30°C, and the surface temperature rises back to 34°C after 20 minutes; the compressive strength is 1.2MPa, and slight wrinkling and deformation occur after 10 uses.

[0030] Comparative Example 2 Comparative Example 1 is a composite pad lacking an intermediate layer, consisting only of a top layer 1 and a bottom layer 3, without the PCM microcapsule intermediate layer 2; the top layer 1 is the polyester-nylon blend cool-feeling fabric of Example 2, 120g / m². 2 The bottom layer 2 is the sandwich mesh fabric of Example 2, 150g / m². 2 It is prepared by high-frequency hot pressing composite material at a temperature of 130℃, a pressure of 0.4MPa, and a time of 20s. It is cut into 90cm×150cm sizes, edged and sewn, and the finished product is 1.5cm thick.

[0031] Performance testing: The cooling sensation lasts for 15 minutes, and the surface temperature rises back to 32°C after 20 minutes; the compressive strength is 2.5 MPa. The cooling effect depends on the instantaneous contact of the surface layer and has no continuous cooling effect.

[0032] Performance Test Comparison Table Test Project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Duration of cooling sensation (minutes) 45 52 48 8 15 Surface temperature (°C) after 20 minutes 28 27 29 34 32 Compressive strength (MPa) 3.8 3.5 4.2 1.2 2.5 <![CDATA[Air permeability (L / m 2 ·s)]]> 800 750 900 500 680 Cooling sensation retention rate after washing (50 washes) 92% 94% 90% 65% 70% Deformation rate after repeated folding (500 times) 0.8% 0.5% 0.3% 3.2% 1.5% The test conditions were: ambient temperature 25℃, humidity 50%, and the duration of the cooling sensation was tested by simulating human contact at a constant temperature of 36℃. The post-wash test followed the standard procedure of GB / T8629-2017.

[0033] As shown in the performance test comparison table above, in Example 3, the cooling sensation lasts for up to 48 minutes and the air permeability reaches 900 L / m² under the combined action of the top layer 1, middle layer 2, and bottom layer 3. 2 •s indicates the effectiveness of the top layer 1, middle layer 2, and bottom layer 3 in Example 3; in Comparative Example 1, only the top layer cooling fabric was used, and the duration of cooling sensation was significantly reduced to 8 minutes; the top layer 1, middle layer 2, and bottom layer 3 of Example 3 ensured superior cooling sensation duration and breathability; in Comparative Example 2, the duration of cooling sensation decreased sharply after using top layer 1 and bottom layer 3; the top layer 1, middle layer 2, and bottom layer 3 of Example 3 contributed to good cooling sensation duration and breathability; In summary, Example 1 was prepared using a quilting process, with a polyester outer layer, a polypropylene nonwoven fabric and n-octadecane microcapsules combined with doctor blade printing for the middle layer, and a bleached bottom layer, emphasizing cost-effectiveness and versatility. Example 2 was prepared using a high-frequency hot pressing process, with a polyester-nylon blend outer layer, a viscose nonwoven fabric with n-hexadecane microcapsules combined with roller printing for the middle layer, and a dyed bottom layer, emphasizing mass production and a lightweight texture. Example 3 was prepared using a quilting and high-frequency hot pressing process, with a bamboo fiber-polyester blend outer layer, a polyester nonwoven fabric with n-nonadecane microcapsules combined with doctor blade printing for the middle layer, and a thickened mesh bottom layer, emphasizing high strength and durability.

[0034] Therefore, the top layer 1, middle layer 2 and bottom layer 3 of Example 3 provide good cooling duration and breathability. Thus, the performance of Example 3 of the present invention is superior to that of the comparative example.

[0035] In summary, the best embodiment of the present invention is Embodiment 3. The multilayer composite pad prepared according to the surface layer 1, the middle layer 2 and the bottom layer 3 of Embodiment 3 achieves the best balance of comprehensive performance and is suitable for the textile industry.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-layered composite pad having a long-lasting cooling function, characterized in that, It comprises a surface layer (1), an intermediate layer (2) and a bottom layer (3) which are sequentially compounded from top to bottom. The surface layer (1) is a cool fiber fabric, the intermediate layer (2) is a cool printing non-woven fabric implanted with PCM phase change microcapsules, and the bottom layer (3) is a three-dimensional network support substrate. The surface layer (1), the intermediate layer (2) and the bottom layer (3) are connected by quilting or high-frequency heat pressing, thereby forming an integrated composite structure.

2. The multi-layered composite pad with long-lasting cooling function according to claim 1, wherein: The cool fiber fabric of the surface layer (1) is at least one of cotton, hemp, bamboo fiber, polyester or nylon, and the gram weight of the surface layer (1) is 120-180 g / m 2 .

3. The multi-layered composite pad with long-lasting cooling function according to claim 1, wherein: The PCM phase change microcapsule of the intermediate layer (2) has a particle size of 3-10 μm, and the coating amount of the PCM phase change microcapsule on the non-woven fabric is 20-40 g / m 2 . The grammage of the intermediate layer (2) is 80-120 g / m 2 .

4. The multi-layered composite pad with long-lasting cooling function according to claim 1, wherein: The three-dimensional net support base material of the bottom layer (3) is a sandwich mesh cloth, the grammage of the bottom layer is 150-220 g / m 2 , and the compressive strength is ≥3.5 MPa.

5. A method for preparing a multilayer composite pad with a lasting cooling function as described in any one of claims 1-4, characterized in that, It comprises the following steps: S1, preparing the surface layer (1), selecting polyester or polyester-polyamide blended fiber fabric, dyeing or printing processing to obtain a cool surface fabric; S2, preparing the intermediate layer (2), using PCM microcapsule coating, and compounding on the non-woven fabric substrate by printing process, and obtaining cool printing non-woven fabric after drying; S3, preparing the bottom layer (3), selecting sandwich mesh cloth, bleaching or dyeing processing to obtain a three-dimensional network support substrate; S4, stacking the prepared surface layer (1), intermediate layer (2) and bottom layer (3) in order from top to bottom, and compounding and fixing by quilting or high-frequency heat pressing process, the quilting needle spacing is 8-12 needles / 10cm, the high-frequency heat pressing temperature is 120-150℃, the pressure is 0.3-0.6MPa, and the time is 10-30s; S5, cutting the integrated fabric after compounding according to the preset product size; S6, edge covering and sewing of the cut fabric to obtain a multi-layer composite pad product.

6. The production method according to claim 5, wherein The solid content of the PCM microcapsule coating is 30-50wt%, and the printing process is doctor blade printing or roller printing, the drying temperature is 80-100℃, and the drying time is 3-8min.

7. The preparation method according to claim 5, characterized in that, The fiber fineness of the polyester or polyester-polyamide blended fabric is 1.2-2.0dtex, the warp breaking strength is ≥300N / 5cm, and the weft breaking strength is ≥250N / 5cm.

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