Cold storage pad with cold capacity slow release function and preparation process thereof

Abstract

The invention relates to the field of textile fabrics, and discloses a cold storage pad with a cold capacity slow release function and a preparation process thereof, and the cold storage pad with the cold capacity slow release function comprises a cold storage agent, a double-layer spacer fabric and a packaging bag. The cold storage pad is composed of air, spacer fabric, a cold storage agent and a packaging bag. And the spacer fabric has a supporting effect, so that the horizontally placed cold storage agent can form a flat air layer in the cold storage pad when being frozen. The cold storage agent contains a thickening agent, a foaming agent, inorganic salt and the like, and deformation of a flat air layer after the cold storage agent is melted can be slowed down. The cold storage pad is unique in structure and novel in product.

Description

Technical Field

[0001] This application relates to the field of textile fabrics, and more specifically, it relates to a cold storage pad with a cold quantity slow-release function and its preparation process. Background Art

[0002] With the frequent occurrence of global warming and extreme high-temperature weather, the problem of heat stress in high-temperature working environments has become increasingly prominent, seriously affecting the health and work efficiency of workers. Cooling vests bring coolness and comfort to workers in the sweltering summer. The cooling vest absorbs the heat of the human body and the environment through a cold storage agent. Among them, the water-based cold storage agent is the most commonly used cold storage agent at present. For example, the Chinese patent with the authorization publication number CN 213756745U discloses a cooling vest with ice packs, which uses the phase change heat absorption characteristics of ice to achieve the cooling effect. The ice pack has a high enthalpy value and can absorb more heat under the same mass. However, the phase change temperature point of ice is relatively low, and direct contact with the human body is likely to cause cold stress. Therefore, although the high-enthalpy cold storage agent can extend the cooling duration, the contradiction between the low-temperature phase change characteristics and human comfort has not been effectively solved. Therefore, on the premise of ensuring that the cold storage agent has a high enthalpy value, how to reduce the cold stress injury to the human body has become the key to improving the wearing comfort of the cooling vest. Summary of the Invention

[0003] The invention object of this application is to reduce the cold stress injury to the human body and improve the wearing comfort of the cooling vest on the premise of ensuring that the cold storage agent has a high enthalpy value. For this reason, the present invention provides a cold storage pad with a cold quantity slow-release function and its preparation process.

[0004] In the first aspect, the present invention provides a cold storage pad with a cold quantity slow-release function. The cold storage pad with a cold quantity slow-release function includes air, spacer fabric, cold storage agent and packaging bag. The air, spacer fabric and cold storage agent are placed inside the packaging bag. The cold storage agent and air are sealed and injected inside the double-layer spacer fabric.

[0005] The spacer fabric can be selected to be woven into a double-layer spacer fabric with a yarn composed of one or more combinations of polyester fiber, polypropylene fiber, nylon fiber and polyethylene fiber, and the fabric layer height is between 1-3 cm.

[0006] The cold storage agent is composed of deionized water, thickening agent, foaming agent and inorganic salt. The content of deionized water is between 85-99%, the thickening agent is between 0.1-9%, the foaming agent is between 0.1-6%, and the inorganic salt is between 0.1-5%.

[0007] The thickening agent is composed of one or more of sodium polyacrylate, starch, arabic gum and carboxymethyl cellulose.

[0008] The foaming agent is composed of one or more of sodium dodecyl sulfate and sodium lauroyl methyl aminopropionate

[0009] The inorganic salt is one or more of sodium carbonate, sodium sulfate, sodium chloride, and calcium chloride.

[0010] A preparation method of the above-mentioned cold storage pad with a cold quantity slow release function, which comprises the following steps:

[0011] (1) Cut the spacer fabric and the composite fabric;

[0012] (2) Hot-press the composite fabric;

[0013] (3) Prepare the cold storage agent;

[0014] (4) Inject the cold storage agent and air;

[0015] (5) Hot-press and seal the composite.

[0016] Further, in step (1), the length and width of the spacer fabric are 2-5 cm less than those of the composite fabric.

[0017] Further, in step (2), stack them in the order of "one layer of composite fabric, one layer of spacer fabric, one layer of composite fabric" in sequence and hot-press and bond the two layers of composite fabric together. The width of the hot-press seam is between 0.2-0.8 cm, the hot-press temperature is between 180-260 °C, and the hot-press pressure is between 10-30 MPa. In addition, leave a 1 cm gap on one side of the composite fabric not hot-pressed and bonded as a filling port for subsequent filling of air and the cold storage agent.

[0018] Further, in step (3), add the thickening agent, foaming agent, and inorganic salt to deionized water in sequence and stir for 6 hours in an environment of 25-50 °C, and the stirring speed is 50-300 revolutions per minute;

[0019] Further, in step (4), fill deionized water from the filling port until it is full, then pour out the deionized water to measure the capacity of the cold storage bag, dry the cold storage bag, then load the cold storage agent, and the content of the cold storage agent is 10-90% of the capacity of the cold storage bag. Then, fill in air, and the air content is 10-90% of the capacity of the cold storage bag;

[0020] Further, in step (5), after filling in air, clamp the filling port of the cold storage bag and hot-press for sealing. The hot-press temperature is between 180-260 °C, and the hot-press pressure is between 10-30 MPa.

[0021] Due to the adoption of the above scheme, the beneficial effects of the present invention are:

[0022] 1. A cold storage pad with a cold quantity slow-release function according to the present invention is composed of air, spacer fabric, cold storage agent, and packaging bag. The spacer fabric has a supporting effect, which helps the horizontally placed cold storage agent to form a "flat" air layer in the cold storage pad during freezing. The cold storage agent contains thickeners, foaming agents, inorganic salts, etc., which can slow down the deformation of the "flat" air layer after the cold storage agent melts. The cold storage pad of the present invention has a unique structure and novel product.

[0023] 2. A cold storage pad with a cold quantity slow-release function according to the present invention can reduce the cold quantity release speed and reduce human cold stress by means of the air layer in the cold storage pad.

[0024] 3. The air layer in the cold storage pad of the present invention reduces the cold quantity release speed of the cold storage agent, which helps to increase the cooling duration.

[0025] 4. The preparation process of the present invention is simple and does not require equipment replacement, and can be mass-produced, which is suitable for large-scale promotion. Description of the Drawings

[0026] Figure 1 It is a process flow chart of a cold storage pad with a cold quantity slow-release function provided by the present invention;

[0027] Figure 2 It is a structural schematic diagram of a cold storage pad with a cold quantity slow-release function provided by the present invention;

[0028] Figure 3 It is a schematic diagram of the cold quantity slow-release principle of a cold storage pad with a cold quantity slow-release function provided by the present invention;

[0029] Note: 1 - Composite fabric, 2 - Cold storage agent, 3 - Spacer fabric, 4 - Air. Detailed Embodiments

[0030] The technical solutions and effects of the present application will be further described in detail below in conjunction with embodiments and drawings. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention.

[0031] Embodiment

[0032] (1) Cut the spacer fabric and the composite fabric. The length of the spacer fabric is 8 cm and the width is 6 cm; the length of the composite fabric is 10 cm and the width is 8 cm. The spacer fabric is a double-layer polyester spacer fabric, and the composite fabric is a composite fabric composed of a polyurethane film and a polyester fabric.

[0033] (2) Heat-pressed composite fabric. Stack the fabrics in the order of "one layer of composite fabric, one layer of spacer fabric, one layer of composite fabric" and heat-press and bond the two layers of composite fabric together. The width of the heat-pressed seam is 0.4 cm, the heat-pressing temperature is 200 °C, and the heat-pressing pressure is 15 MPa. In addition, leave a 1 cm gap on one side of the composite fabric without heat-pressing and bonding as the filling port for subsequent air and cool storage agent filling.

[0034] (3) Prepare the cool storage agent. Add sodium polyacrylate, sodium dodecyl sulfate, and sodium carbonate into deionized water in sequence, and stir for 6 hours at 25 - 50 °C with a stirring speed of 50 - 300 revolutions per minute. The content of deionized water is 95%, the content of sodium polyacrylate is 2%, the foaming agent is 2%, and the inorganic salt is 1%.

[0035] (4) Inject the cool storage agent and air. Load the cool storage agent, and the content of the cool storage agent is 70% of the capacity of the cool storage bag. Then, fill in air, and the content of air is 30% of the capacity of the cool storage bag.

[0036] (5) Heat-press and seal the composite. Clamp the filling port of the cool storage bag and heat-press for sealing. The heat-pressing temperature is 200 °C, and the heat-pressing pressure is 15 MPa.

[0037] Using a Pyrist Dse differential scanning calorimeter, the enthalpy value of the cool storage agent is measured to be 289 J / g in accordance with "GB / T 19466.3 - 2004 Plastics - Differential scanning calorimetry (DSC) - Part 3: Determination of melting and crystallization temperatures and enthalpies".

[0038] Use a constant-temperature heating hot plate to simulate the human skin surface. The surface of the hot plate is made of silica gel, and the surface temperature is set at 33 °C. Place the cool storage pad on the hot plate, and use a thermocouple thermometer to measure the temperature on the side of the cool storage pad close to the hot plate and the temperature on the side of the cool storage pad close to the environment respectively, and record the relevant data. The test environment temperature is maintained at 25 ± 1 °C, and the environmental humidity is maintained at 65 ± 1% RH. The test results show that the temperature of the contact surface between the cool storage pad of the present invention and the hot plate is on average 8 °C lower than that of a common cool storage pad. The time for the surface of the cool storage pad of the present invention to reach 33 °C is 11 minutes longer than that of a common cool storage pad.

[0039] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above, or modify it into an equivalent embodiment with equivalent changes, which does not affect the essence of the present invention. Therefore, all simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A cold storage pad with a cold quantity slow-release function, characterized in that, The cold storage pad with the function of cold quantity slow release includes a cold storage agent, a double-layer spacer fabric and a packaging bag.

2. The cold storage pad with a cold quantity slow release function according to claim 1, characterized in that The cold storage agent includes deionized water, a thickening agent, a foaming agent and inorganic salts. The content of deionized water is 85-99%, the content of the thickening agent is 0.1-9%, the content of the foaming agent is 0.1-6%, and the content of the inorganic salts is 0.1-5%.

3. The cold storage pad with a cold quantity slow-release function according to claim 2, wherein, The thickening agent is selected from one or more of sodium polyacrylate, starch, gum arabic and carboxymethyl cellulose.

4. The cold storage pad with a cold quantity slow release function according to claim 2, characterized in that, The foaming agent is selected from one or more of sodium dodecyl sulfate and sodium lauroyl sarcosinate.

5. The cold storage pad with a cold quantity slow-release function according to claim 2, characterized in that, The inorganic salts are selected from one or more of sodium carbonate, sodium sulfate, sodium chloride and calcium chloride.

6. The cold storage pad with a cold quantity slow release function according to claim 1, characterized in that, The double-layer spacer fabric is woven from yarns composed of one or more combinations of polyester fiber, polypropylene fiber, nylon fiber and polyethylene fiber.

7. The preparation method of the cold storage pad with the function of cold quantity slow release according to claim 1, characterized in that, It includes the following steps: (1) Cut the spacer fabric and the composite fabric. (2) Stack them in the order of "one layer of composite fabric, one layer of spacer fabric, one layer of composite fabric" in sequence, hot-press the composite fabric, and leave a 1-cm gap as the filling port. (3) Inject the cold storage agent. (4) Inject a certain amount of air. (5) Hot-press and seal the package.

8. For the preparation method of the cold storage pad with the function of cold quantity slow release according to claim 7, the hot-pressing temperature is between 180-260 °C, and the hot-pressing pressure is between 10-30 MPa.

9. For the preparation method of the cold storage pad with the function of cold quantity slow release according to claim 7, the air injection amount is 10-90% of the volume of the packaging bag, and the cold storage agent injection amount is 10-90% of the volume of the packaging bag.

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