Cooling pillow and method of production thereof

Abstract

This application relates to the technical field of everyday bedding, and in particular to a cooling pillow and its manufacturing method. A cooling pillow includes a pillow core body; a gel layer is disposed on at least one end face of the pillow core body, and the gel layer has a plurality of through-holes; the surface layer of the pillow core body is provided with phase change material microcapsules, and the gel layer comprises the following raw materials in parts by weight: 90-110 parts of aqueous polyurethane emulsion, 40-50 parts of composite material, 0.3-1 parts of wetting and dispersing agent, 0.1-0.5 parts of defoamer, 0.2-1 parts of thickener, and 0.1-0.3 parts of leveling agent. This application discloses a cooling pillow and its manufacturing method. By coupling three technologies—adding phase change material microcapsules to the surface layer of the pillow core body, providing a gel layer on the pillow core body, and providing through-holes in the gel layer—this application significantly improves the durability and comfort of the cooling experience of the cooling pillow, allowing it to not only provide an initial cool and comfortable sensation but also maintain a cool and comfortable sensation for a long time.

Description

Technical Field

[0001] This application relates to the technical field of everyday bedding products, and in particular to a cooling pillow and a method for producing the same. Background Technology

[0002] Most cooling pillows currently on the market are designed for a single function and generally suffer from technical defects such as limited temperature control, short duration of cooling sensation, insufficient temperature regulation capabilities, and easy heat accumulation. These defects fail to meet users' long-term needs for comfortable sleep temperature control. Specific defects are as follows: Firstly, cooling pillows using pure gel layers rely solely on the cooling sensation of the gel material itself for instant cooling. Their core function is only rapid heat conduction and surface cooling, lacking the ability to actively store and lock in heat. During use, the gel layer quickly absorbs body heat, causing its own temperature to rise, and the cooling sensation will quickly diminish or even disappear within a short period. At the same time, the absorbed heat remains inside the pillow core and cannot be effectively dissipated, easily leading to localized heat accumulation and a rebound in pillow core temperature, resulting in extremely poor long-term temperature control.

[0003] Secondly, cooling pillows that only use perforated and breathable structures rely solely on the perforated channels inside the pillow core for passive air convection heat dissipation. Without a front-end interface for rapid cooling, the initial cooling experience is weak. Furthermore, they can only passively dissipate a small amount of heat through natural airflow and do not have the function of actively absorbing or locking in body heat. The temperature control efficiency is low, and when the ambient temperature is slightly high, the passive convection heat dissipation effect is greatly reduced, making it impossible to achieve a stable constant temperature effect. Overall, the practicality of temperature control is insufficient.

[0004] Third, while some pillow core products using phase change material technology have certain active heat storage and temperature regulation capabilities, most of them are not equipped with efficient front-end heat conduction interfaces and back-end heat dissipation channels. After absorbing heat, the phase change material cannot quickly complete the heat conduction and release, which easily leads to the problem of temperature control failure after heat storage saturation. The phase change temperature regulation function cannot operate continuously and efficiently, the overall temperature control link is broken, and it is difficult to achieve stable temperature control throughout the entire process.

[0005] Therefore, existing cooling pillow products with single functions or single structures cannot form a complete and coherent temperature control system. They cannot simultaneously take into account the instant cooling effect, the duration of the cooling sensation, and the stable constant temperature performance, making it difficult to meet users' needs for long-lasting, stable, and comfortable sleep temperature control. There is an urgent need for a cooling pillow structure that can solve the above-mentioned technical defects. Summary of the Invention

[0006] In view of the shortcomings of the prior art, this application provides a cooling pillow and a method for producing the same.

[0007] In the first aspect, this application provides a cooling pillow, which adopts the following technical solution: A cooling pillow includes a pillow core body; a gel layer is disposed on at least one end face of the pillow core body, and a plurality of through holes are disposed on the gel layer; a phase change material microcapsules are disposed on the surface of the pillow core body. The gel layer comprises the following raw materials in parts by weight: 90-110 parts of waterborne polyurethane emulsion, 40-50 parts of composite material, 0.3-1 part of wetting and dispersing agent, 0.1-0.5 parts of defoamer, 0.2-1 part of thickener, and 0.1-0.3 parts of leveling agent.

[0008] By adopting the above technical solutions, the cooling pillow in this application achieves a three-dimensional closed-loop temperature control system through the deep coupling of three core technologies: adding phase change material microcapsules to the surface of the pillow core, setting a gel layer on the surface of the pillow core, and adopting a matrix perforation structure on the gel layer. This system realizes full-link temperature control from instant cooling upon contact and dynamic constant temperature to active heat dissipation, effectively solving the technical problems of rapid cooling decay, local heat accumulation, and dependence on the environment in traditional cooling pillows.

[0009] PCM phase change material microcapsules are dispersed at the molecular level on the surface of the pillow core. When the temperature of the head exceeds the human comfort threshold (about 32°C), the phase change material inside the microcapsule will change from solid to liquid, absorbing and locking in excess heat to achieve active heat absorption and cooling. When the body temperature drops or the ambient temperature decreases, it will change back from liquid to solid, slowly releasing heat to avoid discomfort caused by sudden temperature changes. Throughout the process, the temperature of the head and neck is kept stable within a comfortable range of ±1.5°C, achieving rapid cooling of the head and neck.

[0010] The gel layer has a good thermal conductivity, which can quickly absorb heat from the skin of the head and neck upon contact, bringing a soft, cool touch experience and effectively solving the stuffy and damp feeling of traditional memory foam pillows. Secondly, as a heat-conducting medium, the gel layer can quickly and evenly spread the heat from the contact area to the entire pillow surface, avoiding local heat accumulation. This provides uniform heat input to the PCM phase change material microcapsules, greatly improving the heat absorption efficiency of the PCM phase change material microcapsules and achieving a synergistic effect of instant cooling without icing and continuous constant temperature.

[0011] In this application, the gel layer has several through-holes. The diameter and spacing of each through-hole have been optimized by hydrodynamics to form a directional airflow channel that runs through the pillow core. When the head is pressed down, hot air inside the pillow core can be quickly expelled through the openings, while cool air from the outside can be introduced, creating dynamic convection. This allows the heat absorbed by the PCM phase change material microcapsules to be quickly expelled from the pillow, preventing heat from circulating and accumulating inside the pillow core. At the same time, the perforated structure significantly increases the porosity of the pillow core, breaking the limitations of the closed-cell structure of ordinary polyurethane pillows. The air permeability is increased several times, which not only helps the gel layer to quickly dissipate heat but also allows the PCM phase change material microcapsules to carry away heat through airflow during the phase change process, preventing heat from remaining inside the pillow core and achieving a smooth end-to-end process of heat absorption, conduction, and expulsion.

[0012] Preferably, the composite material comprises the following raw materials in parts by weight: 0.5-1.5 parts beeswax, 5-15 parts camellia seed oil, 25-35 parts whey protein isolate, 120-180 parts sodium hydroxide, 0.2-0.6 parts pectin, 80-120 parts soybean, 280-330 parts n-hexane, 0.5-1.5 parts sodium carboxymethyl cellulose, 1-1.5 parts sodium periodate, 90-150 parts ethanol, 1-5 parts silica aerogel aqueous suspension, and 0.5-1.5 parts silane coupling agent.

[0013] Preferably, the silica aerogel aqueous suspension comprises the following raw materials in parts by weight: 1-3 parts silica aerogel, 0.05-1 part sodium hexametaphosphate, 0.05-1 part sodium pyrophosphate, and 50-150 parts water.

[0014] Preferably, the method for preparing the aqueous suspension of silica aerogel includes the following steps: dry grinding the silica aerogel, adding water for mixing, and then adding sodium hexametaphosphate and sodium pyrophosphate for mixing to obtain the aqueous suspension of silica aerogel.

[0015] Preferably, the method for preparing the composite material includes the following steps: Beeswax and camellia seed oil were mixed to obtain product 1; Whey protein isolate and sodium hydroxide were mixed, pectin was added and mixed, and then product 1 was added and mixed to obtain product 2. Mix soybeans and n-hexane, filter, collect the precipitate, dissolve the precipitate in water, adjust the pH to alkaline, centrifuge, and collect the supernatant. Adjust the pH of the supernatant to acidic, centrifuge, collect the precipitate, adjust the pH of the precipitate to neutral, freeze-dry, dissolve the freeze-dried mixture in water, adjust the pH to alkaline, and obtain product 3; Sodium carboxymethyl cellulose and sodium periodate were mixed, the pH was adjusted to acidic, ethanol was added and mixed, dialyzed, and frozen. The frozen mixture was dissolved in water and the pH was adjusted to alkaline to obtain product 4. Product 3 and product 4 were mixed to obtain product 5; Product 2, Product 5, silica aerogel aqueous suspension, and silane coupling agent were mixed to obtain a composite material.

[0016] By adopting the above technical solutions, this application uses natural skin-friendly oils such as beeswax and camellia seed oil as a base, combined with an elastic network formed by whey protein isolate and pectin. This not only gives the pillow a silky feel and cushioning support, but also helps transfer body heat to the cooling layer through the thermal conductivity of the oils. At the same time, the protein-pectin network maintains the fluffiness of the cooling pillow, ensuring that the cooling sensation is evenly distributed and does not collapse. Secondly, the soybean active ingredients contained in the composite material work synergistically with modified sodium carboxymethyl cellulose to form a highly efficient moisture-wicking channel, which can quickly absorb and diffuse sweat produced during sleep, preventing dampness and stickiness from weakening the cooling sensation. The modified cellulose also optimizes the hydrophilicity of the material, further improving breathability. Thirdly, the silica aerogel aqueous suspension contained in the composite material, with its nano-porous structure, blocks the intrusion of external heat with an extremely low thermal conductivity, while promoting air microcirculation through the pores to accelerate the dissipation of body heat.

[0017] In this application, by improving the raw materials of the gel layer, the added composite material forms a stable and functionally synergistic three-dimensional composite network in the cooling pillow, thus bringing multiple core advantages. This network uses silane coupling agents as molecular bridges to firmly bind hydrophilic proteins and cellulose with hydrophobic silica aerogel and oil components, greatly enhancing the integrity and durability of the material and preventing functional layer separation or performance degradation during use.

[0018] This application utilizes the synergistic effect between various raw materials to create a cool sleep microenvironment that is heat-insulating, heat-conducting, moisture-absorbing, breathable, supportive, durable, stable, and actively adjustable. This significantly enhances the durability and comfort of the cooling experience, allowing the cooling pillow to not only feel cool and refreshing upon initial contact but also maintain its coolness for a long time, thus balancing physical cooling with health and comfort.

[0019] Preferably, the composite material further includes 0.1-2 parts of graphene oxide.

[0020] By adopting the above technical solution, this application improves the raw materials of the gel layer by adding graphene oxide, which has high thermal conductivity, can accelerate heat diffusion, further enhance the heat dissipation effect, and improve the thermal conductivity of the cooling pillow.

[0021] Secondly, this application provides a method for producing a cooling pillow, which adopts the following technical solution: A method for producing a cooling pillow includes the following steps: (1) Preparation of gel materials: Weigh out each raw material according to the formula, and mix the water-based polyurethane emulsion, composite material, wetting and dispersing agent, defoamer, thickener and leveling agent to obtain a gel material; (2) The gel material is conveyed to the roller coating machine. The pillow core body with phase change material microcapsules loaded on the surface is conveyed by the conveying device of the roller coating machine to the bottom of the top coating roller. The top coating roller and the uniform coating roller work together to spray the gel material on the surface of the pillow core body. (3) After spraying the gel material onto the surface of the pillow core, it is cured to obtain a gel layer; (4) The gel layer is perforated using a matrix layout to obtain a cooling pillow.

[0022] Preferably, in step (2), the conveying speed of the conveying device is 5-15 m / min, and the rotation speed of the rubber roller is 5-17 r / min.

[0023] Preferably, the curing temperature in step (3) is 45-50℃ and the curing time is 1-2 min.

[0024] Preferably, the thickness of the gel layer in step (4) is 5-10 mm.

[0025] By adopting the above technical solution, the perforation method of the gel layer of the cooling pillow adopts a matrix layout. The pore size and spacing are optimized by fluid mechanics to form a directional airflow channel that runs through the pillow core. This not only helps the gel layer to quickly dissipate heat, but also allows the PCM phase change material microcapsules to carry away heat through airflow during the phase change process, avoiding heat retention in the pillow core and achieving smooth flow of heat absorption, conduction and discharge throughout the entire process.

[0026] In summary, this application includes at least one of the following beneficial technical effects: This application discloses a cooling pillow and its manufacturing method. By coupling three technologies—adding phase change material microcapsules to the surface of the pillow core, providing a gel layer on the surface of the pillow core, and providing through holes on the gel layer—this application significantly improves the durability and comfort of the cooling experience, allowing the cooling pillow to not only feel cool and comfortable upon initial contact but also maintain a cool and comfortable feeling for a long time. Detailed Implementation

[0027] The technical solutions of this application are further illustrated by specific embodiments below. These specific embodiments do not represent a limitation on the scope of protection of this application. Any non-essential modifications and adjustments made by others based on the concept of this application still fall within the scope of protection of this application.

[0028] All raw materials involved in this application are commercially available products, among which, Phase change material microcapsules (PCM), phase change material FSM-PCM1, product number: 9707113, reference phase change temperature: 24℃, reference phase change enthalpy ≥170J / g, 14-24μm, manufacturer: Forsmann Technology (Beijing) Co., Ltd.

[0029] Silica aerogel was purchased from Shengrun Nano; Whey protein isolate (purity ≥90%), product code: L5385-25MG, purchased from Merck. Beeswax, CAS No.: 8006-40-4; Camellia seed oil, CAS No.: 225233-97-6; Pectin, CAS No.: 9000-69-5; Soybean (Dongnong 252), Soybean Research Institute, Northeast Agricultural University; Carboxymethyl cellulose (DS=0.9), Shanghai Aladdin Co., Ltd.; Graphene oxide, product number: 796034, purchased from Merck; Waterborne polyurethane resin emulsion, model: WPU-123, Jiangsu Jufeng Chemical Technology Co., Ltd. The present application will be further described in detail below with reference to embodiments and comparative examples.

[0030] Preparation Example 1:

[0031] The preparation steps of the composite material are as follows: (1) Preparation of aqueous suspension of silica aerogel 2g of silica aerogel was ball-milled at 400r / min for 100 minutes, then sonicated at 40kHz and 500w for 30 minutes. 100g of water was added and mixed for 5 minutes. Then, 0.5g of sodium hexametaphosphate and 0.5g of sodium pyrophosphate were added and mixed for 10 minutes to obtain an aqueous suspension of silica aerogel.

[0032] (2) Preparation of composite materials: Mix 1g of beeswax and 10g of camellia seed oil at 80℃ for 20 minutes, cool to room temperature, and let stand for 20 hours to obtain product 1; Mix 30g of whey protein isolate and 150g of sodium hydroxide for 1 hour; add hydrochloric acid to adjust the pH to 7, add 0.4g of pectin and 20mL of water and mix. Cool to 4°C and let stand for 1 hour, then heat to 90°C for 1.5 hours, cool to room temperature and let stand for 1 hour, add product 1 and mix for 5 minutes, cool at 4°C for 2 hours, and then place at room temperature for 20 hours to obtain product 2. Mix 100g of soybeans and 300g of n-hexane for 1.5 hours, let stand for 30 minutes, filter, collect the precipitate, add 1000mL of water to the precipitate and mix for 30 minutes, add sodium hydroxide to adjust the pH to 8.5, continue stirring for 1.5 hours, centrifuge, collect the supernatant; add hydrochloric acid solution to adjust the pH of the supernatant to 4.5, mix for 30 minutes, centrifuge, collect the precipitate, add sodium hydroxide to the precipitate and adjust the pH to 7, pre-freeze the mixture at -50℃ for 2 hours, then freeze-dry for 10 hours, add the frozen mixed powder to 90mL of water and mix for 1 hour, let stand at room temperature for 12 hours, add sodium hydroxide to adjust the pH to 8, to obtain product 3; 1 g of sodium carboxymethyl cellulose and 30 mL of water were mixed for 25 minutes. 1.3 g of sodium periodate was added and mixed for 10 minutes. Hydrochloric acid was added to adjust the pH to 3, and the mixture was reacted at 35 °C for 10 hours. 110 g of ethanol was added and mixed for 6 minutes. The mixture was then transferred to a dialysis bag with a molecular weight cutoff of 3500 Da for dialysis. The dialysis mixture was frozen at -20 °C for 20 hours and then freeze-dried at -50 °C for 20 hours. 10 mL of water was added and mixed for 2.5 hours. Sodium hydroxide was added to adjust the pH to 8 to obtain product 4. Product 3 was heated at 90°C for 30 minutes, product 4 was added and mixed for 2 minutes, the temperature was raised to 90°C and heated for 30 minutes, cooled to room temperature and allowed to stand for 2 hours to obtain product 5. Product 2, Product 5, 3g of silica aerogel aqueous suspension, and 1g of silane coupling agent KH550 were mixed for 20 minutes. Then, 1g of graphene oxide was added and mixed for another 20 minutes to obtain the composite material.

[0033] Preparation Example 2:

[0034] The preparation steps of the composite material are as follows: (1) Preparation of aqueous suspension of silica aerogel 1g of silica aerogel was ball-milled at 400r / min for 100 minutes, then sonicated at 40kHz and 500w for 30 minutes. 50g of water was added and mixed for 5 minutes. Then, 0.05g of sodium hexametaphosphate and 0.05g of sodium pyrophosphate were added and mixed for 10 minutes to obtain an aqueous suspension of silica aerogel.

[0035] (2) Preparation of composite materials: Mix 0.5g of beeswax and 5g of camellia seed oil at 80℃ for 20 minutes, cool to room temperature, and let stand for 20 hours to obtain product 1; Mix 25g of whey protein isolate and 120g of sodium hydroxide for 1 hour; add hydrochloric acid to adjust the pH to 7, add 0.2g of pectin and 20mL of water and mix. Cool to 4°C and let stand for 1 hour, then heat to 90°C for 1.5 hours, cool to room temperature and let stand for 1 hour, add product 1 and mix for 5 minutes, cool at 4°C for 2 hours, and then place at room temperature for 20 hours to obtain product 2. Mix 80g of soybeans and 280g of n-hexane for 1.5 hours, let stand for 30 minutes, filter, collect the precipitate, add 1000mL of water to the precipitate and mix for 30 minutes, add sodium hydroxide to adjust the pH to 8.5, continue stirring for 1.5 hours, centrifuge, collect the supernatant; add hydrochloric acid solution to adjust the pH of the supernatant to 4.5, mix for 30 minutes, centrifuge, collect the precipitate, add sodium hydroxide to the precipitate and adjust the pH to 7, pre-freeze the mixture at -50℃ for 2 hours, then freeze-dry for 10 hours, add the frozen mixed powder to 90mL of water and mix for 1 hour, let stand at room temperature for 12 hours, add sodium hydroxide to adjust the pH to 8, to obtain product 3; 0.5 g of sodium carboxymethyl cellulose and 30 mL of water were mixed for 25 minutes. 1 g of sodium periodate was added and mixed for 10 minutes. Hydrochloric acid was added to adjust the pH to 3, and the mixture was reacted at 35 °C for 10 hours. 90 g of ethanol was added and mixed for 6 minutes. The mixture was then transferred to a dialysis bag with a molecular weight cutoff of 3500 Da for dialysis. The dialyzed mixture was frozen at -20 °C for 20 hours and then freeze-dried at -50 °C for 20 hours. 10 mL of water was added and mixed for 2.5 hours. Sodium hydroxide was added to adjust the pH to 8, yielding product 4. Product 3 was heated at 90°C for 30 minutes, product 4 was added and mixed for 2 minutes, the temperature was raised to 90°C and heated for 30 minutes, cooled to room temperature and allowed to stand for 2 hours to obtain product 5. Product 2, Product 5, 1g of silica aerogel aqueous suspension, and 0.5g of silane coupling agent KH550 were mixed for 20 minutes. Then, 0.1g of graphene oxide was added and mixed for another 20 minutes to obtain the composite material.

[0036] Preparation Example 3:

[0037] The preparation steps of the composite material are as follows: (1) Preparation of aqueous suspension of silica aerogel 3g of silica aerogel was ball-milled at 400r / min for 100 minutes, then sonicated at 40kHz and 500w for 30 minutes. 150g of water was added and mixed for 5 minutes. Then, 1g of sodium hexametaphosphate and 1g of sodium pyrophosphate were added and mixed for 10 minutes to obtain an aqueous suspension of silica aerogel.

[0038] (2) Preparation of composite materials: Mix 1.5g of beeswax and 15g of camellia seed oil at 80℃ for 20 minutes, cool to room temperature, and let stand for 20 hours to obtain product 1; Mix 35g of whey protein isolate and 180g of sodium hydroxide for 1 hour; add hydrochloric acid to adjust the pH to 7, add 0.6g of pectin and 20mL of water and mix. Cool to 4°C and let stand for 1 hour, then heat to 90°C for 1.5 hours, cool to room temperature and let stand for 1 hour, add product 1 and mix for 5 minutes, cool at 4°C for 2 hours, and then place at room temperature for 20 hours to obtain product 2. 120g of soybeans and 330g of n-hexane were mixed for 1.5 hours, allowed to stand for 30 minutes, filtered, and the precipitate was collected. 1000mL of water was added to the precipitate and mixed for 30 minutes. Sodium hydroxide was added to adjust the pH to 8.5, and stirring was continued for 1.5 hours. The mixture was centrifuged and the supernatant was collected. Hydrochloric acid solution was added to adjust the pH of the supernatant to 4.5, and the mixture was mixed for 30 minutes. The mixture was centrifuged and the precipitate was collected. Sodium hydroxide was added to the precipitate and the pH was adjusted to 7. The mixture was pre-frozen at -50℃ for 2 hours and then freeze-dried for 10 hours. The frozen powder was added to 90mL of water and mixed for 1 hour. The mixture was allowed to stand at room temperature for 12 hours, and sodium hydroxide was added to adjust the pH to 8 to obtain product 3. 1.5 g of sodium carboxymethyl cellulose and 30 mL of water were mixed for 25 minutes. 1.5 g of sodium periodate was added and mixed for 10 minutes. Hydrochloric acid was added to adjust the pH to 3, and the mixture was reacted at 35 °C for 10 hours. 150 g of ethanol was added and mixed for 6 minutes. The mixture was then transferred to a dialysis bag with a molecular weight cutoff of 3500 Da for dialysis. The dialyzed mixture was frozen at -20 °C for 20 hours and then freeze-dried at -50 °C for 20 hours. 10 mL of water was added and mixed for 2.5 hours. Sodium hydroxide was added to adjust the pH to 8, yielding product 4. Product 3 was heated at 90°C for 30 minutes, product 4 was added and mixed for 2 minutes, the temperature was raised to 90°C and heated for 30 minutes, cooled to room temperature and allowed to stand for 2 hours to obtain product 5. Product 2, Product 5, 5g of silica aerogel aqueous suspension, and 1.5g of silane coupling agent KH550 were mixed for 20 minutes. Then, 2g of graphene oxide was added and mixed for another 20 minutes to obtain the composite material.

[0039] Example 1:

[0040] A method for producing a cooling pillow includes the following steps: Step 1: Under low-speed stirring, 20g of phase change material microcapsules were gradually added to 70g of aqueous polyurethane emulsion and mixed for 30 minutes. Then, 1g of wetting and dispersing agent (BYK-190), 0.3g of defoamer (BYK-024), and 20g of deionized water were added and mixed for 30 minutes. Finally, 0.5g of thickener (polyurethane thickener, Dutch Cryminal 662) was added to adjust the viscosity of the finishing liquid to 4000mPa·s. Using a spraying process, the finishing liquid is evenly applied to the surface of the pillow core body. The wet film thickness is controlled at 0.2 mm. The coated pillow core body is first pre-baked in a 70°C oven for 4 minutes to allow partial evaporation of moisture and initial shaping of the coating. Then, it is cured at 120°C for 13 minutes to allow the polyurethane resin to completely form a film, firmly encapsulating the microcapsules, resulting in a pillow core body with phase change material microcapsules loaded on the surface.

[0041] Step Two: 100g of waterborne polyurethane emulsion, 45g of composite material, 0.6g of wetting and dispersing agent (BYK-190), 0.3g of defoamer (BYK-024), 0.5g of thickener (polyurethane thickener RM-2020), and 0.2g of leveling agent (BYK-348) were mixed for 40 minutes to obtain a gel material. The composite material was prepared as described in Preparation Example 1.

[0042] Step 3: The gel material is fed to the roller coating machine. The pillow core body with microcapsules of phase change material loaded on the surface is conveyed by the conveying device of the roller coating machine to the bottom of the top coating roller. The top coating roller and the even coating roller work together to spray the gel material onto the surface of the pillow core body. The conveying speed of the conveying device is 10m / min, and the rotation speed of the rubber roller is 12r / min.

[0043] Step Four: The gel material was sprayed onto the upper surface of the pillow core, with a gel layer thickness of 8 mm, and cured at 48°C for 1.5 min. Step 5: A matrix layout is used to perforate the gel layer, with through holes set throughout the gel layer to create a cooling pillow.

[0044] Example 2:

[0045] A method for producing a cooling pillow includes the following steps: Step 1: Under low-speed stirring, 20g of phase change material microcapsules were gradually added to 70g of aqueous polyurethane emulsion and mixed for 30 minutes. Then, 1g of wetting and dispersing agent (BYK-190), 0.3g of defoamer (BYK-024), and 20g of deionized water were added and mixed for 30 minutes. Finally, 0.5g of thickener (polyurethane thickener, Dutch Cryminal 662) was added to adjust the viscosity of the finishing liquid to 4000mPa·s. Using a spraying process, the finishing liquid is evenly applied to the surface of the pillow core body. The wet film thickness is controlled at 0.2 mm. The coated pillow core body is first pre-baked in a 70°C oven for 4 minutes to allow partial evaporation of moisture and initial shaping of the coating. Then, it is cured at 120°C for 13 minutes to allow the polyurethane resin to completely form a film, firmly encapsulating the microcapsules, resulting in a pillow core body with phase change material microcapsules loaded on the surface.

[0046] Step Two: 90g of waterborne polyurethane emulsion, 40g of composite material, 0.3g of wetting and dispersing agent (BYK-190), 0.1g of defoamer (BYK-024), 0.2g of thickener (polyurethane thickener RM-2020), and 0.1g of leveling agent (BYK-348) were mixed for 40 minutes to obtain a gel material. The composite material was prepared in Preparation Example 2.

[0047] Step 3: The gel material is fed to the roller coating machine. The pillow core body with microcapsules of phase change material loaded on the surface is conveyed by the conveying device of the roller coating machine to the bottom of the top coating roller. The top coating roller and the even coating roller work together to spray the gel material onto the surface of the pillow core body. The conveying speed of the conveying device is 5m / min, and the rotation speed of the rubber roller is 5r / min.

[0048] Step Four: The gel material was sprayed onto the upper surface of the pillow core, with a gel layer thickness of 8 mm, and cured at 45°C for 1 min. Step 5: A matrix layout is used to perforate the gel layer, with through holes set throughout the gel layer to create a cooling pillow.

[0049] Example 3:

[0050] A method for producing a cooling pillow includes the following steps: Step 1: Under low-speed stirring, 20g of phase change material microcapsules were gradually added to 70g of aqueous polyurethane emulsion and mixed for 30 minutes. Then, 1g of wetting and dispersing agent BYK-190, 0.3g of defoamer BYK-024 and 20g of deionized water were added and mixed for 30 minutes. Finally, 0.5g of thickener (polyurethane thickener, Dutch Cryminal 662) was added to adjust the viscosity of the finishing liquid to 4000mPa·s. Using a spraying process, the finishing liquid is evenly applied to the surface of the pillow core body. The wet film thickness is controlled at 0.2 mm. The coated pillow core body is first pre-baked in a 70°C oven for 4 minutes to allow partial evaporation of moisture and initial shaping of the coating. Then, it is cured at 120°C for 13 minutes to allow the polyurethane resin to completely form a film, firmly encapsulating the microcapsules, resulting in a pillow core body with phase change material microcapsules loaded on the surface.

[0051] Step Two: 110g of waterborne polyurethane emulsion, 50g of composite material, 1g of wetting and dispersing agent (BYK-190), 0.5g of defoamer (BYK-024), 1g of thickener (polyurethane thickener RM-2020), and 0.3g of leveling agent (BYK-348) were mixed for 40 minutes to obtain a gel material. The composite material was prepared in Preparation Example 3.

[0052] Step 3: The gel material is fed to the roller coating machine. The pillow core body with microcapsules of phase change material loaded on the surface is conveyed by the conveying device of the roller coating machine to the bottom of the top coating roller. The top coating roller and the even coating roller work together to spray the gel material onto the surface of the pillow core body. The conveying speed of the conveying device is 15m / min, and the rotation speed of the rubber roller is 17r / min.

[0053] Step Four: The gel material was sprayed onto the upper surface of the pillow core, with a gel layer thickness of 8 mm, and cured at 50°C for 2 minutes. Step 5: A matrix layout is used to perforate the gel layer, with through holes set throughout the gel layer to create a cooling pillow.

[0054] Example 4:

[0055] The difference from Example 1 is that the composite material was prepared by Preparation Example 2.

[0056] Example 5:

[0057] The difference from Example 1 is that the composite material was prepared by Preparation Example 3.

[0058] Example 6:

[0059] The difference from Example 1 is that the amount of composite material added is 40g.

[0060] Example 7:

[0061] The difference from Example 1 is that the amount of composite material added is 50g.

[0062] Comparative Example 1:

[0063] The difference from Example 1 is that no composite material is added.

[0064] Comparative Example 2:

[0065] The difference from Example 1 is that graphene oxide is not added when preparing the composite material.

[0066] Comparative Example 3:

[0067] The difference from Example 1 is that the amount of composite material added is 39g.

[0068] Comparative Example 4:

[0069] The difference from Example 1 is that the amount of composite material added is 51g.

[0070] Comparative Example 5:

[0071] The difference from Example 1 is that the surface of the pillow core does not have phase change material microcapsules.

[0072] The production method of the cooling pillow in this comparative example includes the following steps: Step 1: 100g of waterborne polyurethane emulsion, 45g of composite material, 0.6g of wetting and dispersing agent (BYK-190), 0.3g of defoamer (BYK-024), 0.5g of thickener (polyurethane thickener RM-2020), and 0.2g of leveling agent (BYK-348) were mixed for 40 minutes to obtain a gel material. The composite material was prepared as described in Preparation Example 1.

[0073] Step Two: The gel material is fed to the roller glue machine, and the pillow core body is fed by the conveying device of the roller glue machine to the bottom of the glue roller. The glue roller and the glue spreading roller work together to spray the gel material onto the surface of the pillow core body. The conveying speed of the conveying device is 10m / min, and the rotation speed of the rubber roller is 12r / min.

[0074] Step 3: The gel material was sprayed onto the upper surface of the pillow core, with a gel layer thickness of 8 mm, and cured at 48°C for 1.5 min. Step Four: A matrix layout is used to perforate the gel layer, with through holes set throughout the gel layer to create a cooling pillow.

[0075] Comparative Example 6:

[0076] The difference from Example 1 is that the gel layer does not have a number of through holes.

[0077] Comparative Example 7:

[0078] The difference from Example 1 is that the pillow core body does not have a gel layer.

[0079] Performance testing:

[0080] 1. Cooling performance test The test was conducted according to GB / T 35263-2017 "Test and Evaluation of Instant Cooling Performance of Textiles in Contact", and the contact cooling coefficient was calculated.

[0081] 2. Thermal conductivity testing The thermal conductivity was calculated according to ASTM D7984-21, "Standard Test Method for Measuring the Thermal Emissivity of Fabrics Using an Improved Transient Plane Source (MTPS) Instrument".

[0082] 3. Rebound rate test According to the international standard ISO 3386-1:1986 "Determination of compressive stress-strain properties of flexible foam polymeric materials - Part 1: Low-density materials", a universal testing machine was used to apply a constant pressure to the cooling pillow, and the rebound time and recovery ratio were recorded.

[0083] 4. Compression set test Tests were conducted according to industry standard HG / T 5644-2019 "Latex Pillows".

[0084] Table 1 Performance Test Results

[0085] As shown in Table 1, the cooling pillow prepared in this application has good cooling performance, thermal conductivity, resilience, and compression set. This indicates that in the preparation of the cooling pillow, this application has constructed a three-dimensional closed-loop temperature control system by deeply coupling three core technologies: adding phase change material microcapsules to the surface of the pillow core, setting a gel layer on the pillow core, and adopting a matrix perforation structure on the gel layer. This system achieves full-link temperature control from instantaneous cooling upon contact and dynamic constant temperature to active heat dissipation, effectively solving the technical problems of rapid cooling decay, local heat accumulation, and dependence on the environment in traditional cooling pillows.

[0086] Based on the test results of Example 1 and Comparative Example 1, it can be seen that the cooling performance, thermal conductivity, resilience, and compression set of Example 1 are all better than those of Comparative Example 1. This indicates that by improving the raw materials of the gel layer in this application, the added composite material forms a stable and functionally synergistic three-dimensional composite network in the cooling pillow, which constructs a functional system for a lasting, stable, and actively regulated cool sleep microenvironment for the cooling pillow, significantly improving the durability and comfort of the cooling experience.

[0087] Based on the test results of Example 1 and Comparative Example 2, it can be seen that the cooling performance, thermal conductivity, resilience, and compression set of Example 1 are all better than those of Comparative Example 2. This indicates that the addition of graphene oxide has high thermal conductivity, which can accelerate heat diffusion, further enhance the heat dissipation effect, improve the thermal conductivity of the cooling pillow, and thus further improve the overall performance of the cooling pillow.

[0088] Based on the test results of Examples 1, 6, 7, Comparative Example 3, and Comparative Example 4, it can be seen that the amount of composite material added has a certain impact on the cooling performance, thermal conductivity, resilience, and compression set of the cooling pillow. Furthermore, the overall performance of the cooling pillow is optimal when the amount of composite material added is 40-50 parts by mass.

[0089] Based on the test results of Example 1 and Comparative Example 5, it can be seen that the cooling performance, thermal conductivity, resilience, and compression set of Example 1 are all better than those of Comparative Example 5. This indicates that the surface of the pillow core is provided with phase change material microcapsules, which can be adjusted according to the temperature of the head and neck to achieve rapid cooling of the head and neck, thereby further improving the overall performance of the cooling pillow.

[0090] Based on the test results of Example 1 and Comparative Example 6, it can be seen that the cooling performance, thermal conductivity, resilience, and compression set of Example 1 are all better than those of Comparative Example 6. This indicates that the gel layer has several through holes, and the diameter and spacing of each through hole have been optimized by fluid dynamics to form a directional airflow channel that runs through the pillow core, which can dissipate heat from the body and thus further improve the overall performance of the cooling pillow.

[0091] Based on the test results of Example 1 and Comparative Example 7, it can be seen that the cooling performance, thermal conductivity, resilience, and compression set of Example 1 are all superior to those of Comparative Example 7. This indicates that the pillow core body is provided with a gel layer. The gel layer has a good thermal conductivity and can quickly absorb the heat from the skin of the head and neck upon contact, bringing a soft, cool touch experience and effectively solving the stuffy and damp feeling of traditional memory foam pillows. Secondly, as a heat-conducting medium, the gel layer quickly and evenly diffuses the heat from the contact area to the entire pillow surface, avoiding local heat accumulation, thereby further improving the overall performance of the cooling pillow.

Claims

1. A cooling pillow, characterized in that: The pillow core body includes a gel layer on at least one end face of the pillow core body, and the gel layer has a plurality of through holes; the surface of the pillow core body is provided with phase change material microcapsules. The gel layer comprises the following raw materials in parts by weight: 90-110 parts of waterborne polyurethane emulsion, 40-50 parts of composite material, 0.3-1 part of wetting and dispersing agent, 0.1-0.5 parts of defoamer, 0.2-1 part of thickener, and 0.1-0.3 parts of leveling agent.

2. The cooling pillow according to claim 1, characterized in that: The composite material comprises the following raw materials in parts by weight: 0.5-1.5 parts beeswax, 5-15 parts camellia seed oil, 25-35 parts whey protein isolate, 120-180 parts sodium hydroxide, 0.2-0.6 parts pectin, 80-120 parts soybean, 280-330 parts n-hexane, 0.5-1.5 parts sodium carboxymethyl cellulose, 1-1.5 parts sodium periodate, 90-150 parts ethanol, 1-5 parts silica aerogel aqueous suspension, and 0.5-1.5 parts silane coupling agent.

3. A cooling pillow according to claim 2, characterized in that: The silica aerogel aqueous suspension comprises the following raw materials in parts by weight: 1-3 parts silica aerogel, 0.05-1 part sodium hexametaphosphate, 0.05-1 part sodium pyrophosphate, and 50-150 parts water.

4. A cooling pillow according to claim 3, characterized in that: The preparation method of the silica aerogel aqueous suspension includes the following steps: dry grinding the silica aerogel, adding water for mixing, and then adding sodium hexametaphosphate and sodium pyrophosphate for mixing to obtain the silica aerogel aqueous suspension.

5. A cooling pillow according to claim 2, characterized in that: The method for preparing the composite material includes the following steps: Beeswax and camellia seed oil were mixed to obtain product 1; Whey protein isolate and sodium hydroxide were mixed, pectin was added and mixed, and then product 1 was added and mixed to obtain product 2. Mix soybeans and n-hexane, filter, collect the precipitate, dissolve the precipitate in water, adjust the pH to alkaline, centrifuge, and collect the supernatant. Adjust the pH of the supernatant to acidic, centrifuge, collect the precipitate, adjust the pH of the precipitate to neutral, freeze-dry, dissolve the freeze-dried mixture in water, adjust the pH to alkaline, and obtain product 3; Sodium carboxymethyl cellulose and sodium periodate were mixed, the pH was adjusted to acidic, ethanol was added and mixed, dialyzed, and frozen. The frozen mixture was dissolved in water and the pH was adjusted to alkaline to obtain product 4. Product 3 and product 4 were mixed to obtain product 5; Product 2, Product 5, silica aerogel aqueous suspension, and silane coupling agent were mixed to obtain a composite material.

6. A cooling pillow according to claim 2, characterized in that: The composite material also includes 0.1-2 parts of graphene oxide.

7. A method for producing a cooling pillow, characterized in that: Includes the following steps: Weigh out each raw material according to the formula, and mix the water-based polyurethane emulsion, composite material, wetting and dispersing agent, defoamer, thickener and leveling agent to obtain a gel material; (2) The gel material is conveyed to the roller coating machine. The pillow core body with phase change material microcapsules loaded on the surface is conveyed by the conveying device of the roller coating machine to the bottom of the top coating roller. The top coating roller and the uniform coating roller work together to spray the gel material on the surface of the pillow core body. (3) After spraying the gel material onto the surface of the pillow core, it is cured to obtain a gel layer; (4) The gel layer is perforated using a matrix layout to obtain a cooling pillow.

8. The method for producing a cooling pillow according to claim 7, characterized in that: In step (2), the conveying speed of the conveying device is 5-15 m / min, and the rotation speed of the rubber roller is 5-17 r / min.

9. A method for producing a cooling pillow according to claim 7, characterized in that: The curing temperature in step (3) is 45-50℃ and the curing time is 1-2 min.

10. A method for producing a cooling pillow according to claim 7, characterized in that: The thickness of the gel layer in step (4) is 5-10 mm.

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