Polymer buffer pad

Abstract

The utility model belongs to the field of cushion pads, and relates to a macromolecule cushion pad which comprises an upper surface layer, a lower surface layer and an elastic buffer layer located between the upper surface layer and the lower surface layer. The bonding layers and the buffer layers are alternately arranged, the upper surface layer and the lower surface layer are in contact with the bonding layers, each buffer layer comprises a polymer matrix and hollow polymer microspheres dispersed in the polymer matrix, and the wall thickness of each hollow polymer microsphere is 0.5-50 microns. The polymer buffer cushion can effectively regulate and control the rebound resilience of the microspheres when the microspheres are compressed under stress, the hollow polymer microspheres are adopted to replace a traditional air bag structure, the microspheres cannot be combined, compared with a traditional air mixing mode, the regulation and control capacity of the air bag structure in a product can be remarkably improved, the product is more stable, and the service life of the product is prolonged. The product service life is prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of buffer pads, and in particular relates to a polymer buffer pad. Background Art

[0002] Buffer pads are mainly used to absorb or mitigate vibrations or impacts in the fields of machinery, electronics, automobiles, etc., reduce the jitter of mechanical equipment, avoid deviation of parts, extend the service life of mechanical equipment, prevent products from being damaged by vibration or impact, and protect product quality and safety.

[0003] Cushion pads are usually made of soft elastic materials. Among them, polymer cushion pads use polymer materials as the matrix, and many tiny airbag structures are arranged inside the polymer matrix to achieve the cushioning function. The airbag structure plays an important role in adjusting the performance and life of the cushion. However, the airbag structure is achieved by high-speed shearing of the colloid before molding and mixing a certain amount of air. As the use time increases, many adjacent micro-airbags will merge with each other to form larger bubbles, forming defects and affecting product quality. In addition, the size and distribution of the airbags are difficult to control, which will seriously affect the performance stability and service life of the cushion. Utility Model Content

[0004] The utility model aims to overcome the defects of the existing airbag structure cushion, such as poor performance stability and short service life, and to provide a polymer cushion with high performance stability and long service life.

[0005] Specifically, the polymer buffer pad provided by the utility model includes an upper surface layer, a lower surface layer and an elastic buffer layer located between the upper and lower surface layers, the elastic buffer layer includes at least one adhesive layer and at least one buffer layer, the adhesive layer and the buffer layer are alternately arranged and the upper and lower surface layers are in contact with the adhesive layer, the buffer pad includes a polymer matrix and hollow polymer microspheres dispersed in the polymer matrix, and the wall thickness of the hollow polymer microspheres is 0.5 to 50 μm.

[0006] In a preferred embodiment, the thickness ratio of the upper surface layer, the lower surface layer and the elastic buffer layer is 1:(0.5-1.5):(1-10).

[0007] In a preferred embodiment, the thickness ratio of the adhesive layer to the buffer layer in the elastic buffer layer is 1:(2-10).

[0008] In a preferred embodiment, the hollow polymer microspheres include a hollow microsphere body and a reinforcement layer and a fluorine-containing polymer layer sequentially coated on the surface of the hollow microsphere body.

[0009] In a preferred embodiment, the ratio of the volume of the gas in the hollow microsphere body to the wall thickness of the hollow microsphere body is (1×10 6 ~1×10 8 )μm 3 :1μm.

[0010] In a preferred embodiment, the hollow microsphere body is a hollow polyacrylonitrile microsphere.

[0011] In a preferred embodiment, the reinforcement layer is a silicon dioxide layer.

[0012] In a preferred embodiment, the surface of the hollow microsphere body is modified with a silane coupling agent.

[0013] In a preferred embodiment, the upper surface layer and the lower surface layer are independently selected from at least one of a fluororesin single-sided impregnated fiber cloth layer, a fluororesin double-sided impregnated fiber cloth layer, a fluororubber single-sided impregnated fiber cloth layer, a fluororubber double-sided impregnated fiber cloth layer, a fluoroelastomer single-sided impregnated fiber cloth layer and a fluoroelastomer double-sided impregnated fiber cloth layer.

[0014] In a preferred embodiment, the polymer matrix is ​​selected from at least one of fluororesin, fluororubber, fluoroelastomer, high temperature thermoplastic elastomer and high temperature thermosetting elastomer.

[0015] The key to the utility model is to use hollow polymer microspheres with a specific wall thickness to replace the traditional airbag structure for the cushion. When the traditional airbag structure cushion is used under high temperature and pressure for a long time, because the gas pressure in the airbag increases significantly, the gas will gradually escape from the product under the action of the pressure difference, causing the product's rebound performance to decrease. Controlling the wall thickness of the hollow polymer microspheres within the range of 0.5 to 50 μm can effectively regulate the rebound performance of the microspheres when they are compressed. By using the hollow polymer microspheres to replace the traditional airbag structure, the microspheres will not merge. Compared with the traditional method of mixing air, the ability to regulate the airbag structure in the product can be significantly improved, making the product more stable and extending the product's service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are only exemplary illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always represent the same or similar parts. Among them:

[0017] Figure 1 A schematic diagram of the structure of the hollow polymer microsphere cushion provided by the utility model;

[0018] Figure 2Another structural schematic diagram of the hollow polymer microsphere cushion provided by the utility model;

[0019] Figure 3 A schematic diagram of the structure of the hollow polymer microsphere provided by the utility model.

[0020] The reference numerals are explained as follows: 10 - upper surface layer; 20 - elastic buffer layer; 30 - lower surface layer; 201 - adhesive layer; 202 - buffer layer. DETAILED DESCRIPTION

[0021] Although the present invention can be easily expressed as embodiments of different forms, only some of the specific embodiments are shown in the drawings and described in detail in this specification. It should be understood that this description should be regarded as an exemplary illustration of the principle of the present invention, and is not intended to limit the present invention thereto.

[0022] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the utility model, rather than implying that each embodiment of the utility model must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0023] In the embodiments shown in the drawings, the indications of directions (such as up and down) used to explain the various components of the present invention are not absolute but relative. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, the indications of these directions also change accordingly.

[0024] The polymer cushion provided by the utility model includes an upper surface layer and a lower surface layer and an elastic cushion layer located between the upper and lower surface layers, the elastic cushion layer includes at least one adhesive layer and at least one buffer layer, the adhesive layer and the buffer layer are alternately arranged and the upper and lower surface layers are in contact with the adhesive layer, and the buffer layer includes a polymer matrix and hollow polymer microspheres dispersed in the polymer matrix. Assuming that the number of layers of the buffer layer is n, the number of layers of the adhesive layer is n+1. In some embodiments, n can be 1, 2, 3, 4, 5, etc., which can be flexibly selected according to actual use. In a specific embodiment, when n is 1, the polymer cushion specifically includes an upper surface layer 10, an elastic cushion layer 20 and a lower surface layer 30, and the elastic cushion layer 20 includes two adhesive layers 201 and a buffer layer 202, that is, including an upper surface layer 10, an adhesive layer 201, a buffer layer 202, an adhesive layer 201 and a lower surface layer 30 stacked in sequence. In a specific embodiment, when n is 2, the specific structure of the polymer cushion is as follows: Figure 1 As shown, it includes an upper surface layer 10, an elastic buffer layer 20 and a lower surface layer 30, and the elastic buffer layer 20 includes three adhesive layers 201 and two buffer layers 202, that is, it includes an upper surface layer 10, an adhesive layer 201, a buffer layer 202, an adhesive layer 201, a buffer layer 202, an adhesive layer 201 and a lower surface layer 30 stacked in sequence. When n is 3, the specific structure of the polymer buffer pad includes an upper surface layer 10, an elastic buffer layer 20 and a lower surface layer 30, and the elastic buffer layer 20 includes four adhesive layers 201 and three buffer layers 202, that is, it includes an upper surface layer 10, an adhesive layer 201, a buffer layer 202, an adhesive layer 201, a buffer layer 202, an adhesive layer 201, a buffer layer 202, an adhesive layer 201 and a lower surface layer 30 stacked in sequence. When n is 4, the specific structure of the polymer buffer pad is as follows: Figure 2 The above-mentioned structure includes an upper surface layer 10, an elastic buffer layer 20 and a lower surface layer 30, wherein the elastic buffer layer 20 includes five adhesive layers 201 and four buffer layers 202, that is, the structure includes an upper surface layer 10, an adhesive layer 201, a buffer layer 202, an adhesive layer 201, a buffer layer 202, an adhesive layer 201, a buffer layer 202, an adhesive layer 201, a buffer layer 202, an adhesive layer 201 and a lower surface layer 30 stacked in sequence. The above structure is deduced by analogy and will not be described in detail here.

[0025] The wall thickness of the hollow microsphere body must be controlled within the range of 0.5 to 50 μm. When the wall thickness is less than 0.5 μm, the polymer outer wall is too thin, the inflation volume is too large, the expansion ratio is too high at high temperature and high pressure, and it is easy to separate from the polymer matrix, which will affect the performance stability and service life; when the wall thickness is greater than 50 μm, the polymer outer wall is too thick, and it is difficult to achieve the rebound buffering function. The hollow microsphere body can more accurately control the size of the microspheres during synthesis, achieving a high degree of size consistency, thereby making the cushion product more evenly stressed during compression, which is more conducive to improving product performance.

[0026] The thickness ratio of the upper surface layer, the lower surface layer and the elastic buffer layer is preferably 1:(0.5-1.5):(1-10). In some embodiments, the thickness ratio of the upper surface layer to the lower surface layer is 1:0.5, 1:0.8, 1:1, 1:1.2, 1:1.5, etc. In some embodiments, the thickness ratio of the upper surface layer to the elastic buffer layer is 1:1, 1:1.5, 1:2, 1:2.5, 1:3, 1:3.5, 1:4, 1:4.5, 1:5, 1:5.5, 1:6, 1:6.5, 1:7, 1:7.5, 1:8, 1:8.5, 1:9, 1:9.5, 1:10, etc.

[0027] The thickness ratio of the adhesive layer to the buffer layer in the elastic buffer layer is preferably 1:(2-10). In some embodiments, the thickness ratio of the adhesive layer to the buffer layer is 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, etc.

[0028] The hollow polymer microspheres may only include a hollow microsphere body, and a gas is encapsulated in the outer wall of the hollow microsphere body. The material of the hollow microsphere body is not specifically limited, and may be at least one of hollow polyacrylonitrile microspheres, hollow polystyrene microspheres, hollow polyimide microspheres, hollow N-phenylmaleimide polymer microspheres, hollow divinylbenzene maleic anhydride polymer microspheres, and hollow polysulfone microspheres. However, in order to make the microspheres have better buffering properties and high temperature resistance, hollow polyacrylonitrile microspheres are preferred. In a preferred embodiment, as Figure 3 As shown, the hollow polymer microspheres include a hollow microsphere body and a reinforcing layer and a fluoropolymer layer sequentially coated on the surface of the hollow microsphere body. Wherein, the introduction of the reinforcing layer can effectively improve the strength of the hollow microspheres, and the introduction of the fluoropolymer layer can improve the compatibility with the polymer matrix, improve the binding of the microspheres to the polymer matrix, and give it the performance of not separating after long-term use. The reinforcing layer can be at least one of a silicon dioxide layer, an aluminum oxide layer, a silicon carbonate layer, etc., preferably a silicon dioxide layer. From the perspective of the availability of raw materials, the fluoropolymer in the fluoropolymer layer is preferably polytrifluoroethyl acrylate and / or polytrifluoroethyl methacrylate. In another preferred embodiment, the surface of the hollow microsphere body is modified with a silane coupling agent, wherein the setting of the silane coupling agent can make the hollow microsphere body and the reinforcing layer more closely combined, which is more conducive to improving performance stability and extending service life. The silane coupling agent preferably contains amino and / or carboxyl groups. Specific examples of the silane coupling agent include, but are not limited to, at least one of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, N-β(aminoethyl)-γ-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, γ-aminopropylmethyldiethoxysilane, 3-aminopropylmethyldimethoxysilane, N-n-butyl-3-aminopropyltrimethoxysilane, bis-[3-(triethoxysilyl)-propyl]-amine, 3-anilinopropyltrimethoxysilane, diethylenetriaminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropylmethyldiethoxysilane, and bis-[3-(trimethoxysilyl)-propyl]-amine.

[0029] The ratio of the volume of the gas in the hollow microsphere body to the wall thickness of the hollow microsphere body is preferably (1×10 6 ~1×10 8 )μm3 :1μm. When the above ratio is lower than the lower limit or higher than the upper limit, the rebound performance of the polymer cushion will be poor or the service life will be shortened. In some embodiments, the ratio of the gas volume in the hollow microsphere body to the wall thickness of the hollow microsphere body is 1×10 6 μm 3 :1μm、1.2×10 6 μm 3 :1μm、1.4×10 6 μm 3 :1μm、1.6×10 6 μm 3 :1μm、1.8×10 6 μm 3 :1μm、2×10 6 μm 3 :1μm、4×10 6 μm 3 :1μm、6×10 6 μm 3 :1μm、8×10 6 μm 3 :1μm, 1×10 7 μm 3 :1μm、1.2×10 7 μm 3 :1μm、1.4×10 7 μm 3 :1μm、1.6×10 7 μm 3 :1μm、1.8×10 7 μm 3 :1μm、2×10 7 μm 3 :1μm、4×10 7 μm 3 :1μm、6×10 7 μm 3 :1μm、8×10 7 μm 3 :1μm, 1×10 8 μm 3 :1μm, etc.

[0030] The material of the bonding layer may be fluororesin, and specific examples thereof include but are not limited to: tetrafluoroethylene / perfluoroalkoxy vinyl ether copolymer (PFA) and / or polytetrafluoroethylene (PTFE).

[0031] The weight ratio of the hollow polymer microspheres to the fluorine-containing polymer matrix in the buffer layer is preferably (0.1-0.5):100, such as 0.1:100, 0.2:100, 0.3:100, 0.4:100, 0.5:100 or any value therebetween. In addition, the fluorine-containing resin matrix can be, for example, tetrafluoroethylene / perfluoroalkoxy vinyl ether copolymer (PFA) and / or polytetrafluoroethylene (PTFE).

[0032] The materials of the upper surface layer and the lower surface layer may be the same or different, and are preferably independently selected from at least one of a fluororesin single-sided impregnated fiber cloth layer, a fluororesin double-sided impregnated fiber cloth layer, a fluororubber single-sided impregnated fiber cloth layer, a fluororubber double-sided impregnated fiber cloth layer, a fluoroelastomer single-sided impregnated fiber cloth layer and a fluoroelastomer double-sided impregnated fiber cloth layer.

[0033] Specific examples of the polymer matrix include, but are not limited to, at least one of fluororesin, fluororubber, fluoroelastomer, high temperature thermoplastic elastomer, and high temperature thermosetting elastomer.

[0034] Example 1

[0035] like Figure 1 As shown, the polymer cushion provided in this embodiment includes an upper surface layer 10, a lower surface layer 30 and an elastic cushion layer 20 located between the upper and lower surface layers, wherein the elastic cushion 20 includes two adhesive layers 201 and a cushion layer 202, that is, includes an upper surface layer 10, an adhesive layer 201, a cushion layer 202, an adhesive layer 201 and a lower surface layer 30 stacked in sequence. The thickness of the upper surface layer 10 is 1 mm, the thickness of the adhesive layer 201 is 0.3 mm, the thickness of the cushion layer 202 is 3.4 mm, and the thickness of the lower surface layer 30 is 1 mm.

[0036] The upper surface layer 10 and the lower surface layer 30 are both PTFE fluororesin double-sided impregnated carbon fiber cloth layers. The bonding layer 201 is a PTFE resin layer. The buffer layer 202 includes a polymer matrix and hollow polymer microspheres dispersed in the polymer group (the mass ratio of the hollow polymer microspheres to the polymer matrix is ​​0.5:100), wherein the polymer matrix is ​​a composite matrix of PFA and PTFE, and the polymer microspheres include a hollow microsphere body modified with a silane coupling agent on the surface, and a reinforcing layer and a fluorine-containing polymer layer sequentially coated on the surface of the hollow microsphere body. The hollow microsphere body is a hollow polyacrylonitrile microsphere, the wall thickness of the hollow microsphere body is about 30μm±0.5μm, and the ratio of the gas volume in the hollow microsphere body to the wall thickness of the hollow microsphere body is about 1.5×10 6 μm 3:1μm, the silane coupling agent layer is a γ-aminopropyltrimethoxysilane layer, the reinforcement layer is a silicon dioxide layer, and the fluorine-containing polymer layer is a poly(trifluoroethyl acrylate) layer. The ratio of the wall thickness of the hollow microsphere body, the thickness of the reinforcement layer, and the thickness of the fluorine-containing polymer layer is 1:2:0.5.

[0037] During use, when the polymer cushion is subjected to external force, it will act on the upper and lower surfaces and transfer to the buffer layer, and the hollow polymer microspheres in the buffer layer will rebound to achieve a buffering effect. The hollow polymer microspheres in the buffer layer replace the traditional airbag structure. The microspheres will not merge with each other and can exist stably in the buffer layer. Therefore, compared with the traditional method of mixing air, the ability to control the airbag structure in the product can be significantly improved, making the product more stable and extending the product life.

[0038] The test shows that the initial thickness of the polymer cushion is 6mm, and the thickness tested under a pressure of 2.5MPa is 5.3mm. The polymer cushion is used 100 times at 230℃ and 2.5MPa (one time is 4 hours at 230℃ and 2.5MPa), and then the thickness of the polymer cushion after 100 uses is tested at room temperature and under no stress, and the result is 5.9mm; at the same time, the thickness of the polymer cushion after 100 uses is tested at room temperature and under a pressure of 2.5MPa, and the result is 5.2mm. It can be seen that the polymer cushion still has good cushioning performance after repeated use under high temperature and high pressure, that is, the cushion has stable cushioning performance and a long service life.

[0039] Example 2

[0040] The polymer cushion provided in this embodiment includes an upper surface layer 10, a lower surface layer 30 and an elastic cushion layer 20 located between the upper and lower surface layers, wherein the elastic cushion 20 includes four adhesive layers 201 and three cushion layers 202, that is, including an upper surface layer 10, an adhesive layer 201, a cushion layer 202, an adhesive layer 201, a cushion layer 202, an adhesive layer 201, a cushion layer 202, an adhesive layer 201 and a lower surface layer 30 stacked in sequence. The thickness of the upper surface layer 10 is 1 mm, the thickness of the adhesive layer 201 is 0.25 mm, the thickness of the cushion layer 202 is 2 mm, and the thickness of the lower surface layer 30 is 1 mm.

[0041] The upper surface layer 10 and the lower surface layer 30 are both PTFE fluororesin double-sided impregnated carbon fiber cloth layers. The bonding layer 201 is a PTFE resin layer. The buffer layer 202 includes a polymer matrix and hollow polymer microspheres dispersed in the polymer group (the mass ratio of the hollow polymer microspheres to the polymer matrix is ​​0.5:100), wherein the polymer matrix is ​​a composite matrix of PFA and PTFE, and the polymer microspheres include a hollow microsphere body with a silane coupling agent modified on the surface, and a reinforcing layer and a fluorine-containing polymer layer sequentially coated on the surface of the hollow microsphere body. The hollow microsphere body is a hollow polyacrylonitrile microsphere, the wall thickness of the hollow microsphere body is about 15μm±0.5μm, and the ratio of the gas volume in the hollow microsphere body to the wall thickness of the hollow microsphere body is about 0.9×10 8 μm 3 :1μm, the silane coupling agent layer is N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, the reinforcement layer is a silicon dioxide layer, and the fluorine-containing polymer layer is poly(trifluoroethyl methacrylate). The ratio of the wall thickness of the hollow microsphere body, the thickness of the reinforcement layer and the thickness of the fluorine-containing polymer layer is 1:2:0.3.

[0042] During use, when the polymer cushion is subjected to external force, it will act on the upper and lower surfaces and transfer to the buffer layer, and the hollow polymer microspheres in the buffer layer will rebound to achieve a buffering effect. The hollow polymer microspheres in the buffer layer replace the traditional airbag structure. The microspheres will not merge with each other and can exist stably in the buffer layer. Therefore, compared with the traditional method of mixing air, the ability to control the airbag structure in the product can be significantly improved, making the product more stable and extending the product life.

[0043] The test shows that the initial thickness of the polymer cushion is 9mm, and the thickness tested under a pressure of 2.5MPa is 8.2mm. The polymer cushion is used 100 times at 230℃ and 2.5MPa (one time is 4 hours at 230℃ and 2.5MPa), and then the thickness of the polymer cushion after 100 uses is tested at room temperature and under no stress, and the result is 8.9mm; at the same time, the thickness of the polymer cushion after 100 uses is tested at room temperature and under a pressure of 2.5MPa, and the result is 8.1mm. It can be seen that the polymer cushion still has good cushioning performance after repeated use under high temperature and high pressure, that is, the cushion has stable cushioning performance and a long service life.

[0044] Although the utility model has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the utility model can be implemented in a variety of forms without departing from the spirit or essence of the utility model, it should be understood that the above-mentioned embodiments are not limited to any of the aforementioned details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.

Claims

1. A polymer cushion, characterized in that: The polymer buffer pad includes an upper surface layer, a lower surface layer and an elastic buffer layer located between the upper and lower surface layers, the elastic buffer layer includes at least one adhesive layer and at least one buffer layer, the adhesive layer and the buffer layer are alternately arranged and the upper and lower surface layers are in contact with the adhesive layer, the buffer layer includes a polymer matrix and hollow polymer microspheres dispersed in the polymer matrix, and the wall thickness of the hollow polymer microspheres is 0.5~50μm.

2. The polymer cushion according to claim 1, characterized in that: The thickness ratio of the upper surface layer, the lower surface layer and the elastic buffer layer is 1:(0.5-1.5):(1-10).

3. The polymer cushion according to claim 1, characterized in that: The thickness ratio of the adhesive layer to the buffer layer in the elastic buffer layer is 1:(2-10).

4. The polymer cushion according to claim 1, characterized in that: The hollow polymer microspheres include a hollow microsphere main body and a reinforcement layer and a fluorine-containing polymer layer which are sequentially coated on the surface of the hollow microsphere main body.

5. The polymer cushion according to claim 4, characterized in that: The ratio of the volume of the gas in the hollow microsphere body to the wall thickness of the hollow microsphere body is (1×10 6 ~1×10 8 )μm 3 :1μm.

6. The polymer cushion according to claim 4, characterized in that: The hollow microsphere main body is hollow polyacrylonitrile microsphere.

7. The polymer cushion according to claim 4, characterized in that: The reinforcement layer is a silicon dioxide layer.

8. The polymer cushion according to claim 4, characterized in that: The surface of the hollow microsphere body is modified with a silane coupling agent.

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