Gel material, multifunctional gel pad, preparation method and application

Abstract

The invention provides a gel material, a multifunctional gel pad, a preparation method and application, and belongs to the technical field of functional materials. The gel material provided by the invention is prepared from the following preparation raw materials in parts by mass: 18 to 21 parts of sodium 2-acrylamido-2-methylpropanesulfonate; 2-4 parts of acrylic acid; 0.04 to 0.08 part of a cross-linking agent; 30-40 parts of a water absorbent; 1.5 to 2 parts of a reinforcing agent; 0.05 to 0.1 part of sodium hydroxide; 0.01 to 0.05 part of a photoinitiator; 0.3 to 0.6 part of a cosolvent; and 15-20 parts of water. The gel material provided by the invention is relatively strong in water absorption, hydrogel formed after water absorption is good in water retention effect, and the multifunctional gel pad prepared from the gel material is relatively long in service life, can be repeatedly used, and can be directly used, heated or cooled for use.

Description

Technical Field

[0001] The present invention relates to the technical field of functional materials, and in particular to a gel material and a multifunctional gel pad, and a preparation method and application thereof. Background Art

[0002] Polymer water-absorbent resin (SAP) is a functional polymer material with a three-dimensional network structure. It has strong water absorption and can be used to prepare resin pads. For example, when using SAP to prepare resin pads, two layers of polyvinyl chloride (PVC) calendered composite fabrics are usually used. Multiple partitions are welded through a high-frequency welding process, and the cold gel obtained by the SAP absorbing water and expanding is fed into each partition through a funnel filling machine. The resin pad can be used as a pet cooling pad, but the water retention effect of SAP is not good, resulting in a short service life of the resin pad, which can generally only be used for one quarter. Moreover, the cold gel obtained by the SAP absorbing water and expanding cannot be heated for use, resulting in a single function of the resin pad. Summary of the invention

[0003] The purpose of the present invention is to provide a gel material and a multifunctional gel pad, as well as a preparation method and application. The gel material provided by the present invention has strong water absorption, and the hydrogel formed after absorbing water has good water retention effect. The multifunctional gel pad prepared using the gel material has a long service life, can be reused, and can be used directly, heated or cooled.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] The present invention provides a gel material, which comprises the following raw materials by weight:

[0006] 18-21 parts of sodium 2-acrylamide-2-methylpropane sulfonate; 2-4 parts of acrylic acid; 0.04-0.08 parts of crosslinking agent; 30-40 parts of water absorbent; 1.5-2 parts of reinforcing agent; 0.05-0.1 parts of sodium hydroxide; 0.01-0.05 parts of photoinitiator; 0.3-0.6 parts of cosolvent; 15-20 parts of water.

[0007] Preferably, the crosslinking agent includes N,N'-methylenebisacrylamide; the water absorbent includes glycerol and / or propylene glycol; the reinforcing agent includes fumed silica; the photoinitiator includes photoinitiator 184 and / or photoinitiator 1173; and the cosolvent includes isopropyl alcohol.

[0008] The present invention provides a method for preparing the gel material described in the above technical solution, comprising the following steps:

[0009] The raw materials are mixed, subjected to polymerization reaction, and then dried to obtain the gel material.

[0010] The present invention provides a multifunctional gel pad, comprising a plurality of connected sealing bodies, each of which is formed by enclosing a first composite material and a second composite material, and each of which is filled with the gel material described in the above technical solution or the gel material prepared by the preparation method described in the above technical solution;

[0011] The first composite material includes a laminated waterproof fabric and a first PEVA film, the second composite material includes a laminated breathable fabric and a second PEVA film, the first PEVA film and the second PEVA film are located on the inner side of the sealing body, and the second PEVA film is provided with a plurality of micropores.

[0012] Preferably, the pore size of each micropore is independently less than 1 mm, and the distance between two adjacent micropores is 4 to 6 mm.

[0013] Preferably, the shape of the sealing body is regular and / or irregular; the lateral dimension and vertical dimension of each sealing body are both ≤10 cm.

[0014] Preferably, the filling amount of the gel material in each of the sealing bodies is 0.2-1 g.

[0015] The present invention provides a method for preparing the multifunctional gel pad described in the above technical solution, comprising the following steps:

[0016] A first composite material and a second composite material are provided, wherein the first composite material is a laminated waterproof fabric and a first PEVA film hot melt adhesive, and the second composite material is a laminated breathable fabric and a second PEVA film hot melt adhesive, and the second PEVA film is provided with micropores;

[0017] The first composite material and the second composite material are stacked and placed with the first PEVA film and the second PEVA film close to each other, a gel material is placed between the first PEVA film and the second PEVA film, and the first composite material and the second composite material are bagged by heat sealing treatment to form a plurality of sealed bodies connected to each other, and each sealed body is filled with the gel material, so as to obtain the multifunctional gel pad.

[0018] The present invention provides the use of the multifunctional gel pad described in the above technical solution or the multifunctional gel pad prepared by the preparation method described in the above technical solution in heat preservation.

[0019] Preferably, the heat preservation method comprises:

[0020] placing the multifunctional gel pad in water for soaking to obtain a hydrogel pad;

[0021] The hydrogel pad is used directly; or the hydrogel pad is used after being heated or cooled.

[0022] Beneficial effects: The gel material provided by the present invention includes the following raw materials by weight: 18-21 parts of 2-acrylamide-2-methylpropanesulfonic acid sodium; 2-4 parts of acrylic acid; 0.04-0.08 parts of cross-linking agent; 30-40 parts of water absorbent; 1.5-2 parts of reinforcing agent; 0.05-0.1 parts of sodium hydroxide; 0.01-0.05 parts of photoinitiator; 0.3-0.6 parts of cosolvent; 15-20 parts of water. The gel material provided by the present invention has strong water absorption, and the hydrogel formed after water absorption has good water retention effect. The multifunctional gel pad prepared by using the gel material has a long service life, can be reused, and can be used directly, heated or cooled. Specifically, when the present invention utilizes the gel material to prepare a multifunctional gel pad, the gel material is directly filled into the sealed body of the multifunctional gel pad. Before use, the multifunctional gel pad is soaked in water, and the gel material absorbs water to form a hydrogel, which can then be used directly, heated or cooled. After use, the pad can be placed outdoors, and the water evaporates to restore the original gel material, so that the product becomes lighter and is convenient to carry when going out or store at home. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a diagram of the initial state of the hydrogel block in Example 1 after it fully absorbs water and before being placed in a constant temperature drying oven;

[0024] Figure 2 This is the initial state diagram of the polymer water-absorbing resin SAP after it fully absorbs water and before being placed in a constant temperature drying oven;

[0025] Figure 3 This is a photo of the hydrogel block and the polymer water-absorbing resin SAP in Example 1 being placed in a constant temperature drying oven for heat treatment after fully absorbing water. DETAILED DESCRIPTION

[0026] The present invention provides a gel material, which comprises the following raw materials by weight:

[0027] 18-21 parts of sodium 2-acrylamide-2-methylpropane sulfonate; 2-4 parts of acrylic acid; 0.04-0.08 parts of crosslinking agent; 30-40 parts of water absorbent; 1.5-2 parts of reinforcing agent; 0.05-0.1 parts of sodium hydroxide; 0.01-0.05 parts of photoinitiator; 0.3-0.6 parts of cosolvent; 15-20 parts of water.

[0028] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known to those skilled in the art or are prepared by methods well known to those skilled in the art.

[0029] The raw materials for preparing the gel material of the present invention include 18 to 21 parts of 2-acrylamido-2-methylpropanesulfonate sodium (AMPS-Na) by weight, and specifically can be 18 parts, 18.5 parts, 19 parts, 19.5 parts, 20 parts, 20.5 parts or 21 parts. The present invention adopts AMPS-Na as a monomer, which is a multifunctional water-soluble anionic surfactant, and is compounded with acrylic acid, a water absorbent and a reinforcing agent to prepare a gel material. The gel material has good water absorption performance, and the hydrogel formed after absorbing water has good water retention effect, and has excellent low-temperature flexibility and permanent compression resilience.

[0030] Based on the mass fraction of the sodium 2-acrylamido-2-methylpropane sulfonate, the raw materials for preparing the gel material of the present invention include 2 to 4 parts of acrylic acid, specifically 2 parts, 2.5 parts, 3 parts, 3.5 parts or 4 parts. The acrylic acid described in the present invention can copolymerize with AMPS-Na when AMPS-Na undergoes a polymerization reaction, and a water absorbent and a reinforcing agent are compounded to obtain a gel material with good water absorption performance. The hydrogel formed after absorbing water has good water retention effect, and has excellent low-temperature flexibility and permanent compression resilience.

[0031] Based on the mass fraction of the sodium 2-acrylamido-2-methylpropane sulfonate, the raw material for preparing the gel material of the present invention includes 0.04 to 0.08 parts of a cross-linking agent, specifically 0.04 parts, 0.045 parts, 0.05 parts, 0.055 parts, 0.06 parts, 0.065 parts, 0.07 parts, 0.075 parts or 0.08 parts. As an embodiment of the present invention, the cross-linking agent may include N,N'-methylenebisacrylamide.

[0032] Based on the mass fraction of the sodium 2-acrylamido-2-methylpropane sulfonate, the raw materials for preparing the gel material of the present invention include 30 to 40 parts of a water absorbent, specifically 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, 38 parts, 39 parts or 40 parts. As an embodiment of the present invention, the water absorbent may include glycerol and / or propylene glycol, specifically glycerol. The use of the above-mentioned types of water absorbents in the embodiments of the present invention is conducive to improving the water absorption performance of the gel material, so that the gel material can absorb more water and maintain a better moisturizing effect, and can also increase the softness and elasticity of the hydrogel.

[0033] Based on the mass fraction of the sodium 2-acrylamido-2-methylpropane sulfonate, the raw materials for preparing the gel material of the present invention include 1.5 to 2 parts of reinforcing agent, specifically 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts or 2 parts. As an embodiment of the present invention, the reinforcing agent includes fumed silica; the reinforcing agent of the above type used in the embodiment of the present invention can form a reversible three-dimensional network structure in the hydrogel by forming a hydrogen bond bridging effect, thereby giving the hydrogel the most suitable rheological effect, which not only helps to control the rheological properties of the hydrogel, but also prevents its sedimentation and sagging, and further enhances the mechanical properties of the hydrogel.

[0034] Based on the mass fraction of the sodium 2-acrylamido-2-methylpropane sulfonate, the raw materials for preparing the gel material of the present invention include 0.05 to 0.1 parts of sodium hydroxide, specifically 0.05 parts, 0.06 parts, 0.07 parts, 0.08 parts, 0.09 parts or 0.1 parts.

[0035] Based on the mass fraction of the sodium 2-acrylamide-2-methylpropane sulfonate, the raw materials for preparing the gel material of the present invention include 0.01 to 0.05 parts of photoinitiator, specifically 0.01 parts, 0.015 parts, 0.02 parts, 0.025 parts, 0.03 parts, 0.035 parts, 0.04 parts, 0.045 parts or 0.05 parts. As an embodiment of the present invention, the photoinitiator includes photoinitiator 184 and / or photoinitiator 1173, specifically photoinitiator 184. In the embodiment of the present invention, the use of the above-mentioned types of photoinitiators can initiate the polymerization, crosslinking and curing of sodium 2-acrylamide-2-methylpropane sulfonate.

[0036] Based on the mass fraction of the sodium 2-acrylamido-2-methylpropane sulfonate, the raw material for preparing the gel material of the present invention includes 0.3 to 0.6 parts of a cosolvent, specifically 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, 0.5 parts, 0.55 parts or 0.6 parts. As an embodiment of the present invention, the cosolvent includes isopropanol. The above-mentioned type of cosolvent used in the embodiment of the present invention can help dissolve or disperse the raw materials such as the photoinitiator, thereby ensuring the smooth preparation of the gel material.

[0037] Based on the mass fraction of the sodium 2-acrylamido-2-methylpropane sulfonate, the raw materials for preparing the gel material of the present invention include 15 to 20 parts of water, specifically 15 parts, 16 parts, 17 parts, 18 parts, 19 parts or 20 parts.

[0038] The present invention provides a method for preparing the gel material described in the above technical solution, comprising the following steps:

[0039] The raw materials are mixed, subjected to polymerization reaction, and then dried to obtain the gel material.

[0040] As an embodiment of the present invention, the method of preparing the raw material mixture can be: mixing the 2-acrylamide-2-methylpropane sulfonate sodium aqueous solution with the crosslinker aqueous solution to obtain a first mixture; mixing the first mixture with acrylic acid to obtain a second mixture; mixing the second mixture with glycerol and fumed silica to obtain a third mixture; mixing the third mixture with a sodium hydroxide aqueous solution to obtain a fourth mixture; mixing the fourth mixture with a photoinitiator solution. As an embodiment of the present invention, the mass concentration of the 2-acrylamide-2-methylpropane sulfonate sodium aqueous solution can be 50-60%, specifically 50%, 53%, 55%, 58% or 60%; the mass ratio of the crosslinker to water in the crosslinker aqueous solution can be 0.04-0.08:2.2, specifically 0.045:2.2; the concentration of the sodium hydroxide aqueous solution can be 45-55wt%, specifically 50wt%. In the embodiment of the present invention, the total amount of water in the 2-acrylamide-2-methylpropane sulfonate sodium aqueous solution, the crosslinker aqueous solution and the sodium hydroxide aqueous solution is the total amount of water used to prepare the gel material. As an embodiment of the present invention, the initiator solution is obtained by mixing a photoinitiator and a co-solvent.

[0041] After mixing the raw materials, the present invention performs a polymerization reaction on the obtained mixture, and then dries it to obtain the gel material. As an embodiment of the present invention, the polymerization reaction can be carried out under ultraviolet light irradiation; the polymerization reaction time can be 5 to 30 seconds, specifically 10 to 12 seconds; the wavelength of the ultraviolet light can be 250 to 420 nm, specifically 365 nm. As an embodiment of the present invention, the polymerization reaction may include: placing a mold with a square flat pit on a conveyor belt, evenly spraying a release agent on the inner surface of the pit, then pouring the mixed material into the pit, and starting the conveyor belt; during the operation of the conveyor belt, 3 to 5 ultraviolet curing devices are placed in parallel directly above it, and the mixed material undergoes a polymerization reaction under ultraviolet irradiation to form a solid hydrogel block; after the hydrogel block passes through the ultraviolet curing device, a cold air blower is placed above the conveyor belt, with the air outlet facing the conveyor belt, and the mold and the hydrogel block are cooled to room temperature by the cold air blower; after the hydrogel block passes through the cold air blower, a layer of PET film is attached to the surface of the hydrogel block, and then the mold is turned upside down, the hydrogel block is taken out, and another layer of PET film is attached to the other surface of the hydrogel block, and it is placed for standby use.

[0042] As an embodiment of the present invention, the polymerization reaction may further include crushing. Specifically, the crushing and drying may be performed simultaneously. In the embodiment of the present invention, a drying and crushing integrated device is specifically used to simultaneously perform the crushing and drying. The present invention does not specifically limit the specific operating conditions of the crushing and drying, and the operating conditions familiar to those skilled in the art may be used. In the present invention, after crushing and drying, the obtained gel material is specifically gel particles.

[0043] The present invention provides a multifunctional gel pad, comprising a plurality of connected sealing bodies, each of which is formed by enclosing a first composite material and a second composite material, and each of which is filled with the gel material described in the above technical solution or the gel material prepared by the preparation method described in the above technical solution; the first composite material comprises a laminated waterproof fabric and a first PEVA film, the second composite material comprises a laminated breathable fabric and a second PEVA film, the first PEVA film and the second PEVA film are located on the inner side of the sealing body, and the second PEVA film is provided with a plurality of micropores.

[0044] When SAP is used to prepare resin pads in the related art, two layers of polyvinyl chloride (PVC) calendered composite fabrics are usually used, and multiple partitions are welded through a high-frequency welding process. The cold gel obtained by the SAP absorbing water and swelling is fed into each partition through a funnel filling machine. The resin pad is heavy as a whole, has a large packaging volume, and has high transportation costs; and the PVC film is an easily breathable material. The water in the cold gel evaporates through the PVC film, and condensed water is easily formed on the surface of the resin pad. The condensed water stays on the cloth for a long time and will breed mold, causing the product to mold; and the resin pad has a short service life and can generally only be used for one quarter. The multifunctional gel pad provided by the present invention uses a PEVA film, which can be degraded and is more conducive to ensuring that environmental protection requirements are met compared to PVC film; by setting micropores, it is convenient for water to enter the sealing body through the micropores when using the multifunctional gel pad, so that water can contact the gel material, and the gel material expands after absorbing water to form a hydrogel; and the multifunctional gel pad provided by the present invention is light in weight and easy to carry out; it can be reused and has a long service life; it is convenient to store, not easy to mold, and is healthy and environmentally friendly. The multifunctional gel pad of the present invention is described in detail below.

[0045] As an embodiment of the present invention, the first composite material is formed by a laminated waterproof fabric and a first PEVA film hot melt adhesive; the second composite material is formed by a laminated breathable fabric and a second PEVA film hot melt adhesive, and micropores are pre-punched on the second PEVA film.

[0046] As an embodiment of the present invention, the micropores on the second PEVA membrane are distributed in an array; the pore size of each micropore is independently <1mm, for example, it can be 0.5-0.8mm, specifically 0.5mm, 0.6mm, 0.7mm or 0.8mm; the spacing between two adjacent micropores is 4-6mm, specifically 4mm, 5mm or 6mm. As an embodiment of the present invention, the first PEVA membrane is not provided with micropores. In the embodiment of the present invention, the pore size and spacing of the micropores are limited to the above range. On the one hand, it can ensure that when the multifunctional gel pad is used, water enters the sealing body in large quantities within 3-5 minutes, which is conducive to the gel material absorbing water and completing expansion as soon as possible. On the other hand, the pore size is not too large to prevent the gel material from seeping out through the micropores after absorbing water and expanding.

[0047] As an embodiment of the present invention, the breathable fabric includes conventional textile fabrics such as polyester taffeta, polyester pongee, nylon taffeta or Oxford cloth.

[0048] As an embodiment of the present invention, the waterproof fabric is a breathable fabric that has been waterproofed, that is, the waterproof fabric can specifically be conventional textile fabrics that have been waterproofed, such as waterproof polyester taffeta, waterproof pongee, waterproof nylon taffeta, or waterproof Oxford cloth; the present invention has no special limitation on the specific method of the waterproof treatment, and a method familiar to those skilled in the art may be used.

[0049] As an embodiment of the present invention, the shape of the sealing body is a regular shape (for example, it can be square and / or circular) and / or irregular shape; the lateral size and vertical size of each sealing body are ≤10cm, for example, it can be 3-8cm, specifically 3cm, 4cm, 5cm, 6cm, 7cm or 8cm. As an embodiment of the present invention, the filling amount of gel material in each sealing body is 0.2-1g, specifically 0.2g, 0.3g, 0.4g, 0.5g, 0.6g, 0.7g, 0.8g, 0.9g or 1g. When SAP is used to prepare a resin pad in the related art, the partitions in the resin pad are usually long strips, and the cold gel formed after SAP absorbs water has poor elasticity. When the resin pad is used as a pet cooling pad, the cold gel filled in the partition (obtained by SAP absorbing water) is squeezed and easily flows to the two ends of each partition, and the pet cooling effect is not good. In the embodiment of the present invention, the gel material has good elasticity after absorbing water, and by controlling the lateral size and the vertical size of the sealing body to be ≤10 cm, and at the same time controlling the filling amount of the gel material in each of the sealing bodies to be 0.2 to 1 g, the hydrogel obtained after the gel material absorbs water fills the entire sealing body. When in use, the hydrogel is not easy to flow, thereby ensuring a good thermal insulation effect.

[0050] As an embodiment of the present invention, a fixing component with a fixing hole can be provided at the edge of the multifunctional gel pad, and the multifunctional gel pad is provided with a fixing belt adapted to the fixing hole. The fixing belt passes through the fixing hole to fix the multifunctional gel pad at the target position for easy use.

[0051] The present invention provides a method for preparing the multifunctional gel pad described in the above technical solution, comprising the following steps:

[0052] A first composite material and a second composite material are provided, wherein the first composite material is a laminated waterproof fabric and a first PEVA film hot melt adhesive, and the second composite material is a laminated breathable fabric and a second PEVA film hot melt adhesive, and the second PEVA film is provided with micropores;

[0053] The first composite material and the second composite material are stacked and placed with the first PEVA film and the second PEVA film close to each other, a gel material is placed between the first PEVA film and the second PEVA film, and the first composite material and the second composite material are bagged by heat sealing treatment to form a plurality of sealed bodies connected to each other, and each sealed body is filled with the gel material, so as to obtain the multifunctional gel pad.

[0054] The present invention provides the use of the multifunctional gel pad described in the above technical solution or the multifunctional gel pad prepared by the preparation method described in the above technical solution in heat preservation. As an embodiment of the present invention, the heat preservation may include warming or cold preservation; specifically, the heat preservation method may include:

[0055] placing the multifunctional gel pad in water for soaking to obtain a hydrogel pad;

[0056] The hydrogel pad is used directly; or the hydrogel pad is used after being heated or cooled.

[0057] The present invention places the multifunctional gel pad in water for soaking treatment to obtain a hydrogel pad. As an embodiment of the present invention, the soaking treatment time can be 3 to 5 minutes, specifically 3 minutes, 4 minutes or 5 minutes; during the soaking treatment, water enters each sealed body through the micropores, and the gel material immediately absorbs water and rapidly expands to 3 to 5 times its own weight to form a hydrogel. The hydrogel has good elasticity and fills each sealed body, so it will not flow during use.

[0058] After the hydrogel pad is obtained, the present invention can use the hydrogel pad directly, for example, the hydrogel pad can be directly placed on the ground as a pet cooling pad for cooling the pet in summer.

[0059] After obtaining the hydrogel pad, the present invention can also heat or cool the hydrogel pad for use. In an embodiment of the present invention, the heating can be microwave heating, and the output power of the microwave oven used for the microwave heating can be 600-900W, specifically 600W, 700W, 800W or 900W; the time can be 1-3min, specifically 1min, 2min or 3min; the hydrogel pad can be placed in a microwave oven for heating; the heated hydrogel pad can be used for hot compress or for heating, such as being directly placed in a pet nest for pets to keep warm in winter. In an embodiment of the present invention, the cooling temperature can be -20-10°C, specifically -20°C, -18°C, -10°C, 0°C or 10°C; the time can be 1-4h, specifically 1h, 1.5h, 2h, 3h or 4h; in an embodiment of the present invention, the hydrogel pad is specifically placed in a refrigerator for cooling; the cooled hydrogel pad can be used for cold compress or for cooling.

[0060] As an embodiment of the present invention, after use, the hydrogel pad can be placed outdoors. The moisture in the hydrogel in the sealed body gradually evaporates under the sun or wind, and eventually returns to the original gel material (it can return to the original gel material in about 10 to 15 days, which is related to the outdoor temperature and wind volume, etc.). The product becomes lighter and is convenient to carry when going out or store at home.

[0061] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] Example 1

[0063] (1) Under stirring conditions, adding a crosslinking agent aqueous solution to 34 kg of a 58% by mass aqueous solution of 2-acrylamide-2-methylpropane sulfonate sodium to obtain a first mixture; the crosslinking agent aqueous solution is obtained by mixing 45 g of N,N'-methylenebisacrylamide with 2.2 kg of filtered water; adding 2 kg of acrylic acid to the first mixture to obtain a second mixture; adding 32.6 kg of glycerol and 1.8 kg of fumed silica to the second mixture to obtain a third mixture; adding a sodium hydroxide aqueous solution to the third mixture to obtain a fourth mixture; the sodium hydroxide aqueous solution is obtained by mixing 0.05 kg of sodium hydroxide solid with 0.05 kg of filtered water; adding a photoinitiator solution to the fourth mixture to obtain a fifth mixture; the photoinitiator solution is obtained by mixing 14 g of photoinitiator 184 with 0.45 kg of isopropanol;

[0064] (2) placing the mold with the square flat pit on a conveyor belt, spraying a release agent evenly on the inner surface of the pit, then pouring the fifth mixture into the pit, and starting the conveyor belt; during the operation of the conveyor belt, 5 ultraviolet curing devices are placed in parallel above it, and the fifth mixture is irradiated with ultraviolet light (the ultraviolet light wavelength is 365nm, and the irradiation time is 12s) to form a solid hydrogel block;

[0065] After the hydrogel block passes through the ultraviolet curing device, a cooling air blower is placed above the conveyor belt, with the air outlet facing the conveyor belt, and the mold and the hydrogel block are cooled to room temperature by the cooling air blower; after the hydrogel block passes through the cooling air blower, a layer of PET film is attached to the surface of the hydrogel block, and then the mold is turned upside down, the hydrogel block is taken out, and another layer of PET film is attached to the other surface of the hydrogel block, and then placed for standby;

[0066] The hydrogel block is dried and crushed by using a drying and crushing integrated device to obtain gel particles.

[0067] Test Example 1

[0068] After the hydrogel block in Example 1 fully absorbs water, it is placed in a constant temperature drying oven and heat treated at 70°C. It is taken out and weighed at the same time every day to test the water retention performance of the hydrogel block, and compared with the high molecular water-absorbing resin SAP (purchased from Jinan Huadi Company, product model 760) after fully absorbing water.

[0069] Figure 1 This is a diagram of the initial state of the hydrogel block in Example 1 after it fully absorbs water and before being placed in a constant temperature drying oven. Figure 2 This is the initial state diagram of the polymer water-absorbing resin SAP after it fully absorbs water and before being placed in a constant temperature drying oven. Figure 3 This is a photo of the hydrogel block and the polymer water-absorbing resin SAP in Example 1 being placed in a constant temperature drying oven for heat treatment after fully absorbing water.

[0070] Table 1 shows the test results of the water retention performance of the hydrogel block and the polymer water-absorbing resin SAP in Example 1. It can be seen from Table 1 that the hydrogel block prepared in Example 1 of the present invention has excellent water retention performance.

[0071] Table 1 Test results of water retention performance of hydrogel block and polymer water-absorbing resin SAP in Example 1

[0072]

[0073] Test Example 2

[0074] The hydrogel block prepared in Example 1 was subjected to a low-temperature flexibility test and a permanent compression resilience test, and compared with a polymer water-absorbing resin SAP (purchased from Jinan Huadi Company, product model 760).

[0075] Table 2 shows the performance test results of the hydrogel block prepared in Example 1, and Table 3 shows the performance test results of the polymer water-absorbing resin SAP; the results show that the hydrogel block prepared in Example 1 has excellent low-temperature flexibility and permanent compression resilience.

[0076] Table 2 Performance test results of the hydrogel blocks prepared in Example 1

[0077]

[0078] Table 3 Performance test results of polymer water-absorbing resin SAP

[0079]

[0080] Example 2

[0081] The gel pad is prepared using the gel particles prepared in Example 1, and the specific steps are as follows:

[0082] A first composite material and a second composite material are provided, wherein the first composite material is a laminated waterproof fabric and a first PEVA film hot melt adhesive, and the second composite material is a laminated breathable fabric and a second PEVA film hot melt adhesive; wherein the waterproof fabric is an Oxford cloth that has been waterproofed, and the breathable fabric is an Oxford cloth; the second PEVA film is pre-arranged with micropores distributed in an array, the pore diameter of the micropores is 0.8 mm, and the distance between two adjacent micropores is 5 mm, and the first PEVA film is not provided with micropores;

[0083] The first composite material and the second composite material are stacked and placed with the first PEVA film and the second PEVA film close to each other, gel particles are placed between the first PEVA film and the second PEVA film, and the first composite material and the second composite material are bagged by an automated heat-sealing integrated device to form a plurality of sealed bodies connected to each other, and each sealed body is filled with the gel particles; wherein the shape of the sealed body is square, the lateral dimension and the vertical dimension of each sealed body are both 5.5 mm, and the filling amount of the gel particles in each sealed body is 0.3 g.

[0084] Furthermore, a fixing component with a fixing hole can be provided on the edge of the gel pad in this embodiment, and the gel pad is provided with a fixing belt adapted to the fixing hole. The fixing belt passes through the fixing hole to fix the gel pad at a target position for easy use.

[0085] Application Example 1

[0086] The method of using the gel pad prepared in Example 2 is as follows:

[0087] The gel pad is placed in water for 4 minutes. Water enters each sealed body through the micropores. The gel particles immediately absorb water and quickly expand to 3 to 5 times their own weight. After absorbing water, the gel particles form hydrogel, that is, each sealed body is filled with hydrogel (the hydrogel has a certain elasticity and the filling amount is appropriate, so the hydrogel in the sealed body will not flow). Then take it out of the water and wipe the surface dry to obtain a hydrogel pad.

[0088] The hydrogel pad can be placed directly on the ground to cool down pets in summer;

[0089] Alternatively, the hydrogel pad is placed in a microwave oven and heated for 2 minutes at an output power of 700 W, and then taken out of the microwave oven for hot compress or heating, such as being directly placed in a pet bed for heating the pet in winter;

[0090] Alternatively, the hydrogel pad can be placed in a refrigerator and frozen at -18°C for 1.5 hours, and then taken out of the refrigerator for use as a cold compress or for cooling.

[0091] When not in use, the hydrogel pad is placed outdoors, and the water in the hydrogel in the sealed body gradually evaporates under the sun or wind, and eventually returns to the original gel granules, making the product lighter and convenient to carry when going out or store at home.

[0092] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A gel material, characterized in that: The preparation materials include the following by weight: 18-21 parts of sodium 2-acrylamide-2-methylpropane sulfonate; 2-4 parts of acrylic acid; 0.04-0.08 parts of crosslinking agent; 30-40 parts of water absorbent; 1.5-2 parts of reinforcing agent; 0.05-0.1 parts of sodium hydroxide; 0.01-0.05 parts of photoinitiator; 0.3-0.6 parts of cosolvent; 15-20 parts of water.

2. The gel material according to claim 1, characterized in that: The cross-linking agent includes N,N'-methylenebisacrylamide; the water absorbent includes glycerol and / or propylene glycol; the reinforcing agent includes fumed silica; the photoinitiator includes photoinitiator 184 and / or photoinitiator 1173; and the co-solvent includes isopropyl alcohol.

3. The method for preparing the gel material according to claim 1 or 2, characterized in that: The following steps are involved: The raw materials are mixed, subjected to polymerization reaction, and then dried to obtain the gel material.

4. A multifunctional gel pad, characterized in that: It comprises a plurality of connected sealing bodies, each of which is formed by enclosing a first composite material and a second composite material, and each of which is filled with the gel material according to claim 1 or 2 or the gel material prepared by the preparation method according to claim 3; The first composite material includes a laminated waterproof fabric and a first PEVA film, the second composite material includes a laminated breathable fabric and a second PEVA film, the first PEVA film and the second PEVA film are located on the inner side of the sealing body, and the second PEVA film is provided with a plurality of micropores.

5. The multifunctional gel pad according to claim 4, characterized in that: The aperture of each micropore is independently less than 1 mm, and the distance between two adjacent micropores is 4 to 6 mm.

6. The multifunctional gel pad according to claim 4 or 5, characterized in that: The shape of the sealing body is regular and / or irregular; the lateral dimension and vertical dimension of each sealing body are both ≤10 cm.

7. The multifunctional gel pad according to claim 6, characterized in that: The filling amount of the gel material in each of the sealing bodies is 0.2-1 g.

8. The method for preparing the multifunctional gel pad according to any one of claims 4 to 7, characterized in that: The following steps are involved: A first composite material and a second composite material are provided, wherein the first composite material is a laminated waterproof fabric and a first PEVA film hot melt adhesive, and the second composite material is a laminated breathable fabric and a second PEVA film hot melt adhesive; The first composite material and the second composite material are stacked and placed with the first PEVA film and the second PEVA film close to each other, a gel material is placed between the first PEVA film and the second PEVA film, and the first composite material and the second composite material are bagged by heat sealing treatment to form a plurality of sealed bodies connected to each other, and each sealed body is filled with the gel material, so as to obtain the multifunctional gel pad.

9. Use of the multifunctional gel pad according to any one of claims 4 to 7 or the multifunctional gel pad prepared by the preparation method according to claim 8 in heat preservation.

10. The use according to claim 9, characterized in that: The heat preservation method comprises: placing the multifunctional gel pad in water for soaking to obtain a hydrogel pad; The hydrogel pad is used directly; or the hydrogel pad is used after being heated or cooled.

Images