Rare earth magnetic memory foam and preparation process thereof

Abstract

The invention relates to the technical field of functional composite materials, in particular to rare earth magnetic memory foam and a preparation technology thereof.The rare earth magnetic memory foam comprises a structural layer, a functional layer and a contact layer which are sequentially combined; the structural layer comprises an aerogel grid framework, and the aerogel grid framework is wrapped with a wrapping layer; the functional layer is made of a rare earth magnet and memory foam composite material; the contact layer is made of an aerogel and memory foam composite material, the contact layer is compounded with the memory foam through the aerogel, the air permeability of the memory foam is improved, the problem of stuffiness of traditional memory foam is solved, the functional layer forms a uniform magnetic field band through directional arrangement of rare earth magnetic powder, local blood circulation can be improved in an auxiliary mode, and the magnetic field health care function is achieved; the supporting performance of the structural layer is enhanced by means of an aerogel grid framework, and collapse caused by long-term use is avoided; the contact layer, the functional layer and the structural layer cooperate to form a unified system with comfortable contact, effective health care and stable supporting, and the problems that traditional memory foam is single in function, stuffy and insufficient in supporting are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of functional composite materials, in particular to a rare earth magnetic memory cotton and a preparation process thereof. BACKGROUND

[0002] Memory cotton, also known as slow-rebound sponge, is a kind of polyurethane foam material with unique mechanical properties. Its characteristics and application scenarios are closely related to the molecular structure of the material itself. When the memory cotton is subjected to external force, the material will gradually deform to conform to the shape of the pressure source. When the pressure is removed, it will not immediately return to its original state, but will slowly rebound to the initial state.

[0003] The application discloses an antibacterial health-care memory cotton pillow with sponge rods and a processing method thereof, which comprises an antibacterial memory cotton pillow core, sponge rods, a magnetic therapy sleeve, a pillowcase and a traditional Chinese medicine supporting column.

[0004] The application discloses a health-care memory cotton pillow for promoting sleep, which comprises a memory cotton body, a natural magnetic powder bag and a health-care medicine bag.

[0005] Traditional memory cotton only has the characteristics of support and slow rebound, lacks auxiliary health-care function, and is difficult to meet the composite needs of users for support and health. Pure memory cotton has poor air permeability and is easy to be hot and stuffy after long-term use. The support is insufficient and is easy to collapse after long-term pressure. If functional materials such as magnetic powder are directly added, uneven dispersion and mechanical property reduction are easy to occur due to poor compatibility. SUMMARY

[0006] (I) Technical problems solved

[0007] The present application provides a rare earth magnetic memory cotton and a preparation process thereof to solve the above problems.

[0008] (II) Technical solutions

[0009] To achieve the above-mentioned purposes, the present application provides the following technical solutions:

[0010] The present application provides a rare earth magnetic memory cotton and a preparation process thereof, which comprises a structure layer, a functional layer and a contact layer combined in sequence.

[0011] The structure layer comprises an aerogel grid skeleton, and the aerogel grid skeleton is wrapped with a wrapping layer.

[0012] The functional layer is a rare earth magnetic and memory cotton composite material.

[0013] The contact layer is an aerogel and memory cotton composite material.

[0014] Further, the aerogel grid skeleton is a fiber-reinforced silicon aerogel, and the grid shape of the aerogel grid skeleton is a hexagon, and the skeleton wall thickness is 10-100 μm.

[0015] Further, the wrapping layer adopts memory cotton material, and the aerogel grid skeleton and the wrapping layer are combined by hot pressing.

[0016] Further, the mass ratio of the rare earth magnet and the memory cotton in the functional layer is 3-5%, forming a uniform magnetic field band with a surface magnetic field strength of 10-30 mT.

[0017] Further, the mass ratio of the aerogel and the memory cotton in the contact layer is 5-10%, and the aerogel particles are uniformly dispersed in the pores of the memory cotton.

[0018] Further, the rare earth magnet in the functional layer adopts neodymium iron boron magnetic powder, and the outside is coated with epoxy resin.

[0019] Further, a magnetic conducting layer is arranged between the structure layer and the functional layer, and the magnetic conducting layer is made of aluminum foil material.

[0020] A preparation process of a rare earth magnetic memory cotton, comprising the following steps:

[0021] (1) Contact layer preparation: mix hydrophobic modified aerogel particles with memory cotton raw materials, and cut into 5-10 mm thick sheets after foaming and curing;

[0022] (2) Functional layer preparation: mix epoxy resin coated rare earth magnetic powder with memory cotton raw materials, and foam into 10-15 mm thick sheet of uniform magnetic field band in a 0.1T magnetic field environment;

[0023] (3) Structure layer preparation: combine high-density memory cotton blank with aerogel grid skeleton through hot pressing process, hot pressing temperature 80-100℃, pressure 0.3-0.5MPa, time 30-60 seconds, forming a 15-20 mm thick sheet;

[0024] (4) Composite molding: coat polyurethane elastic adhesive on the contact surface between the contact layer, the functional layer and the structure layer, and heat press and cure at 80-90℃ for 0.3-0.5 hours, and then cool and cure for 48 hours.

[0025] Further, the aerogel grid skeleton in step (3) is pre-soaked with a silane coupling agent solution with a concentration of 2-5%.

[0026] The application of rare earth magnetic memory cotton is used for preparing health care pillow, waist support or mattress, wherein:

[0027] As a health care pillow, the function layer magnetic field belt corresponds to the physiological curve of human cervical spine;

[0028] As a waist support, the pore size of the aerogel grid skeleton in the structure layer is 8mm-10mm, and the mass ratio of rare earth magnet and memory cotton in the function layer is 4%-5%;

[0029] As a mattress, the thickness of the structure layer is 20mm, and the mass ratio of aerogel and memory cotton in the contact layer is 8%-10%.

[0030] (Three) beneficial effects

[0031] Compared with the prior art, the beneficial effects of the present application are:

[0032] 1. The contact layer is composed of aerogel and memory cotton, which improves the ventilation of memory cotton, solves the problem of heat of traditional memory cotton, the function layer is formed by directional arrangement of rare earth magnetic powder to form a uniform magnetic field belt, which can assist in improving local blood circulation and realizing the function of magnetic field health care; the structure layer enhances the support by the aerogel grid skeleton, avoiding collapse after long-term use;

[0033] 2. An aluminum foil magnetic conducting layer is added between the structure layer and the function layer to reduce the invalid diffusion of the magnetic field to the bottom layer and improve the magnetic field strength acting on the human body;

[0034] 3. By adjusting the thickness and material ratio of each layer, it can be adapted to health care pillow, waist support, mattress and other scenes;

[0035] 4. The contact layer, function layer and structure layer form a unified system of comfortable contact, effective health care and stable support, solving the problems of single function, heat and insufficient support of traditional memory cotton. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0037] Figure 1 is a cross-sectional structure schematic diagram of the present application;

[0038] The reference signs are explained as follows: 1, structure layer; 101, wrapping layer; 102, aerogel grid skeleton; 2, function layer; 3, contact layer; 4, magnetic conducting layer. DETAILED DESCRIPTION

[0039] In order to make the purposes, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0040] Embodiment 1: Rare earth magnetic memory wool for health care pillow

[0041] I. Selection of raw materials

[0042] Structural layer raw material: the fiber-reinforced silica aerogel is adopted for the aerogel grid skeleton 102, the grid shape is hexagonal, the skeleton wall thickness is 50 μm, and the pore size is 8 mm; the high-density memory cotton raw material is adopted for the wrapping layer 101, the molar ratio of polyether polyol to isocyanate in the high-density memory cotton raw material is 1:1.15, and the density is 90 kg / m 3 .

[0043] Functional layer raw material: the particle size of the rare earth magnet is 2 μm neodymium iron boron magnetic powder, the outer side is coated with epoxy resin, and the coating layer thickness is 0.8 μm; the mass ratio of the rare earth magnet to the memory cotton is 4%.

[0044] Contact layer raw material: the aerogel particle is a hydrophobic modified silica aerogel with a particle size of 0.3 mm; the mass ratio of the aerogel to the memory cotton is 8%.

[0045] Other materials: the magnetic conductive layer 4 adopts aluminum foil with a thickness of 0.05 mm; the silane coupling agent concentration is 3% ethanol solution; and the polyurethane elastic adhesive solid content is 60%.

[0046] II. Preparation steps

[0047] Preparation of the contact layer 3: the hydrophobic modified aerogel particles and the memory cotton raw material are mixed at a mass ratio of 8%, the molar ratio of polyether polyol to isocyanate is 1:1.02, high-speed stirring is performed for 3 minutes, then the mold is injected, foaming is performed at 45°C for 6 minutes, curing is performed at 25°C for 24 hours, and cutting is performed to form 8 mm thick sheets, and the aerogel particles are uniformly dispersed in the memory cotton pores.

[0048] Preparation of the functional layer 2: the neodymium iron boron magnetic powder coated with epoxy resin and the memory cotton raw material are mixed at a mass ratio of 4%, pre-stirring is performed at 500 r / min for 10 minutes; the catalyst and the foaming agent are added, stirring is performed at 1200 r / min for 2 minutes, then the mold with a cervical curve groove is injected, a magnetic field of 0.1 T is applied around the mold, and the direction is along the curve tangent; foaming is performed at 40°C for 9 minutes, and cutting is performed to form 12 mm thick sheets after curing, and a uniform magnetic field belt with a surface magnetic field strength of 20-25 mT is formed.

[0049] Structure layer 1 preparation: pretreatment of aerogel grid skeleton 102, immersed in 3% silane coupling agent solution for 12 minutes, dried at 80℃ for 30 minutes;

[0050] Embed the skeleton into a high-density memory cotton blank with a thickness of 20mm, hot-press at 85℃, 0.4MPa for 45 seconds, trim to 18mm thick after cooling, and wrap layer 101 completely wraps the aerogel grid skeleton.

[0051] Composite molding: lay aluminum foil magnetic layer 4 on the upper surface of structure layer 1, and coat polyurethane elastic adhesive with a thickness of 0.08mm on the contact surface of each layer; stack in the order of structure layer 1, magnetic layer 4, functional layer 2, and contact layer 3, hot-press and cure at 85℃, 0.3MPa for 0.4 hours;

[0052] After cooling, mature for 48 hours in an environment of 25℃, 50% humidity, and obtain rare earth magnetic memory cotton for health care pillows.

[0053] Example 2: Rare earth magnetic memory cotton for waist protection

[0054] The difference from Example 1 is that:

[0055] The mass ratio of rare earth magnets to memory cotton in the functional layer is 5%, and the surface magnetic field strength is 25-30mT;

[0056] The pore size of the aerogel grid skeleton in the structure layer is 10mm, the hot-press parameters are 90℃, 0.5MPa, and 50 seconds, and the structure layer thickness is 20mm;

[0057] The contact layer thickness is 10mm, and the mass ratio of aerogel to memory cotton is 10%, which enhances the waist adhesion and air permeability.

[0058] Example 3: Rare earth magnetic memory cotton for mattresses

[0059] The difference from Example 1 is that:

[0060] The structure layer thickness is 20mm, the wall thickness of the aerogel grid skeleton is 80μm, and the support stability is improved;

[0061] The mass ratio of aerogel to memory cotton in the contact layer is 9%, and the thermal conductivity is 0.028W / m·K, which meets the large-area air permeability demand of mattresses; the functional layer thickness is 15mm, and the magnetic field strength is 10-15mT, which meets the whole-body uniform magnetic field effect.

[0062] The above examples are only preferred solutions of the present application, and any equivalent replacement or modification within the technical principles of the present application is within the protection scope of the present application.

[0063] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A rare earth magnetic memory foam, characterized by: It comprises a structural layer (1), a functional layer (2) and a contact layer (3) which are combined in sequence; The structural layer (1) comprises an aerogel grid skeleton (102), and a wrapping layer (101) is wrapped on the aerogel grid skeleton (102); The functional layer (2) is a composite material of rare earth magnets and memory foam; The contact layer (3) is a composite material of aerogel and memory foam.

2. The rare earth magnetic memory foam according to claim 1, characterized in that: The aerogel grid skeleton (102) is a fiber-reinforced silica aerogel, the grid shape of the aerogel grid skeleton (102) is hexagonal, and the skeleton wall thickness is 10 μm-100 μm.

3. The rare earth magnetic memory foam according to claim 1 or 2, characterized in that: The wrapping layer (101) is made of memory cotton material, and the aerogel grid skeleton (102) and the wrapping layer (101) are combined by hot pressing.

4. The rare earth magnetic memory foam according to claim 1, characterized in that: The mass ratio of rare earth magnetism to memory foam in the functional layer (2) is 3%-5%, forming a uniform magnetic field band with a surface magnetic field intensity of 10-30 mT.

5. The rare earth magnetic memory foam according to claim 1, characterized in that: The mass ratio of aerogel to memory foam in the contact layer (3) is 5%-10%, and the aerogel particles are evenly dispersed in the pores of the memory foam.

6. The rare earth magnetic memory foam according to claim 1, characterized in that: The rare earth magnets in the functional layer (2) are made of neodymium iron boron magnetic powder, and the outer side of the magnetic powder is coated with epoxy resin.

7. The rare earth magnetic memory foam according to claim 1, characterized in that: A magnetic conductive layer (4) is provided between the structural layer (1) and the functional layer (2), and the magnetic conductive layer (4) is made of aluminum foil material.

8. A process for preparing rare earth magnetic memory foam, using the rare earth magnetic memory foam according to any one of claims 1 to 5, characterized in that: The following steps are involved: (1) Preparation of contact layer: Mix the hydrophobically modified aerogel particles with the memory foam raw material, foam and mature them, and then cut them into sheets with a thickness of 5 mm to 10 mm; (2) Preparation of functional layer: epoxy resin coated rare earth magnetic powder is mixed with memory foam raw materials and foamed in a 0.1T magnetic field environment to form a 10mm-15mm thick sheet with a uniform magnetic field band; (3) Preparation of structural layer: The high-density memory foam blank is combined with the aerogel grid skeleton through a hot pressing process at a temperature of 80°C-100°C, a pressure of 0.3MPa-0.5MPa, and a time of 30-60 seconds to form a 15mm-20mm thick sheet; (4) Composite molding: Coat the contact surface between the contact layer, functional layer and structural layer with polyurethane elastic adhesive, heat-cure at 80-90℃ for 0.3-0.5 hours, and then mature for 48 hours after cooling.

9. The process for preparing rare earth magnetic memory foam according to claim 6, characterized in that: In step (3), the aerogel grid skeleton is pre-immersed in a silane coupling agent solution with a concentration of 2%-5%.

10. An application of the rare earth magnetic memory foam according to any one of claims 1 to 7, characterized in that: Used for preparing health care pillows, waist protectors or mattresses, wherein: When used as a health pillow, the magnetic field belt of the functional layer corresponds to the physiological curve of the human cervical spine; When used as a waist protector, the pore size of the aerogel grid skeleton in the structural layer is 8mm-10mm, and the mass ratio of rare earth magnets and memory foam in the functional layer is 4%-5%; When used as a mattress, the thickness of the structural layer is 20 mm, and the mass ratio of aerogel and memory foam in the contact layer is 8%-10%.

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