Silica gel spring

Abstract

The invention discloses a silica gel spring, particularly relates to a silica gel spring for a sofa or a mattress, and belongs to the technical field of furniture supplies. The silica gel spring comprises a silica gel material and a metal spring coated in the silica gel material, and the silica gel material comprises the following components in parts by weight: 80-100 parts of food-grade silica gel, 20-30 parts of polyurethane resin, 10-15 parts of toughening resin, 1-2 parts of an antioxidant, 1-1.5 parts of a lubricant and 1-2 parts of a silica gel vulcanizing agent. The silica gel spring comprises a silica gel material and a metal spring wrapped in the silica gel material, the noise can be effectively reduced, the damping performance can be effectively improved, the silica gel material takes food-grade silica gel as a base material, the use safety can be improved, and the added polyurethane resin and toughening resin can be used for improving the damping performance of the silica gel spring. The adaptability of the silica gel material and the metal spring can be effectively improved, so that the mechanical property and weather resistance of the silica gel material are improved.

Description

Technical Field

[0001] The present application relates to a silicone spring, in particular to a silicone spring for a sofa or a mattress, and belongs to the technical field of furniture products. Background Art

[0002] The current mattresses or sofas have built-in springs to improve user comfort. The springs are compressed and rebound when they are weak, which makes the mattresses or sofas have good support and rebound forces. Since the springs are generally made of metal, they have the following disadvantages during the compression and rebound process:

[0003] 1. The compression process will inevitably cause the adjacent elastic rings of the spring to contact each other, and the metal collision will make a sound, making it difficult to achieve silence;

[0004] 2. During the compression and rebound process, the spring is prone to displacement or offset, and is easily linked with other adjacent springs, causing the flatness of the sofa or mattress to decrease.

[0005] In order to solve this shortcoming, CN219742284U discloses a solution of setting a sound insulation sleeve or a silicone tube on the outside of a metal spring. However, under the above setting, the collision of the metal spring itself will still produce a certain amount of noise, and the sound insulation sleeve or silicone tube cannot form a good match with the deformation of the rigid spring, and the sound insulation sleeve or silicone tube cannot effectively absorb the force through elastic deformation. CN107836909A discloses a mattress produced by connecting compression springs with silicone, which is respectively provided with a silicone connection layer at the upper and lower ends of the spring, and the middle part of the spring retains the structure of the original spring, so that the flatness of the mattress is increased and the noise is reduced. However, under this solution, since the middle part of the spring retains the structure of the original spring, it still does not solve the problem of noise generated when the spring is compressed, and the silicone connection layer set at the upper and lower ends of the spring is difficult to absorb the force of the spring.

[0006] Therefore, the mattress or sofa using springs in the existing technology still cannot achieve the effect of muteness, and the shock absorption performance needs to be improved. The applicant found that coating the metal spring with silica gel can effectively solve the above technical problems and obtain a mattress or sofa with excellent muteness and shock absorption performance. However, the silica gel coated on the metal spring needs to deform with the deformation of the metal spring, and the silica gel needs to have good mechanical properties and weather resistance. However, the existing silica gel material has the problem of poor elasticity and is difficult to adapt to the elasticity of the metal spring. In addition, since the mattress or sofa is a daily necessity, silica gel dust should be avoided during use to improve the safety of use. Summary of the invention

[0007] In order to solve the above problems, a silicone spring and a preparation method thereof are provided. The silicone spring comprises a silicone material and a metal spring coated in the silicone material, which can effectively reduce noise and improve shock absorption performance. The silicone material uses food-grade silicone as a base material, which can improve safety of use. The added polyurethane resin and toughening resin can effectively improve the compatibility of the silicone material with the metal spring, thereby improving the mechanical properties and weather resistance of the silicone material.

[0008] According to one aspect of the present application, a silicone spring is provided, comprising a silicone material and a metal spring coated in the silicone material, wherein the silicone material comprises, by weight, 80-100 parts of food-grade silicone, 20-30 parts of polyurethane resin, 10-15 parts of toughening resin, 1-2 parts of antioxidant, 1-1.5 parts of lubricant, and 1-2 parts of silicone vulcanizer;

[0009] The structural formula of the toughening resin is shown in Formula I:

[0010]

[0011] In Formula I, x is selected from any integer between 50 and 60, y is selected from any integer between 40 and 50, n is selected from any integer between 5 and 8, and R is selected from hydroxyl or carboxyl.

[0012] The present application adds polyurethane resin to food-grade silicone, which can significantly improve the elasticity and mechanical properties of food-grade silicone. However, the mixed compatibility of food-grade silicone and polyurethane resin is poor. In the reciprocating compression and rebound test of the silicone spring, there will be problems of cracking and delamination. On this basis, the present application further adds the above-mentioned toughening resin, which plays the role of a concoction agent and lubricant, can improve the compatibility of food-grade silicone and polyurethane resin, reduce the cracking or delamination of silicone materials, and thus improve the weather resistance of silicone materials; in addition, the toughening resin is composed of a carbon chain with a hydroxyl or carboxyl group and a carbon chain without a functional group. The carbon chain without a functional group can improve the toughness of the silicone material, and the carbon chain with a hydroxyl or carboxyl group can form hydrogen bonds or covalent bonds with the polyurethane resin and food-grade silicone in the silicone system, further improving the mechanical properties of the silicone material and extending its service life.

[0013] Optionally, the preparation method of the food-grade silica gel is:

[0014] S1: mixing ethyl orthosilicate and sodium hydroxide solution, stirring and adding γ-aminopropyltrimethoxysilane to react and treat to obtain a silica gel matrix;

[0015] S2: Sodium alginate and chitosan are mixed and ground to obtain a modifier, the modifier is dissolved in a solvent, and then added to a silica gel matrix for ultrasonic oscillation dispersion, and heated at 60-75° C. for reaction for 45-60 minutes to obtain the food-grade silica gel, wherein the sodium alginate and chitosan account for 3wt% and 2wt% of the silica gel matrix, respectively.

[0016] Sodium alginate and chitosan are added to the preparation of the above-mentioned food-grade silica gel, which can improve the antibacterial properties of the food-grade silica gel, thereby improving the safety of the use of the silica gel spring. At the same time, the added chitosan can also improve the connection strength with the metal spring, thereby preventing the silica gel material from falling off from the metal spring during long-term use.

[0017] Optionally, a connection layer formed by a silane coupling agent and glutaraldehyde is further provided between the metal spring and the silicone material.

[0018] Optionally, the silane coupling agent is 1-2 parts, the glutaraldehyde is 0.5-1.3 parts, and the silane coupling agent and glutaraldehyde are coated on the surface of the metal spring to form the connection layer.

[0019] Optionally, the silane coupling agent is selected from at least one of bis(γ-triethoxysilylpropyl)tetrasulfide and bis(γ-triethoxysilylpropyl)disulfide.

[0020] The connecting layer formed between the metal spring and the silicone material can enhance the connectivity between the metal spring and the silicone material, improve the bonding strength between the two, and thus improve the integrity of the silicone material. The silane coupling agent added to the connecting layer can form a covalent bond with the hydroxyl or carboxyl group carried in the toughening resin, thereby improving the connection strength between the connecting layer and the silicone material. Glutaraldehyde can undergo a cross-linking reaction with the amino group carried in the food-grade silicone to form a chemical bond, thereby also improving the connection strength between the connecting layer and the silicone material. Therefore, the connecting layer formed by the silane coupling agent and glutaraldehyde can achieve a double connection with the silicone material, thereby improving the integrity of the silicone spring, making the silicone material more compatible with the properties of the metal spring, thereby improving the overall elasticity and load-bearing capacity of the silicone spring.

[0021] Optionally, the antioxidant is tert-butylhydroquinone;

[0022] The lubricant is at least one of n-butyl stearate, methyl stearate, ethyl stearate, barium stearate, magnesium stearate, zinc stearate, and aluminum stearate;

[0023] The silicone vulcanizing agent is a platinum vulcanizing agent.

[0024] According to another aspect of the present application, a method for preparing the silicone spring described in any one of the above items is provided, comprising the following steps:

[0025] (1) cleaning and drying the metal spring;

[0026] (2) mixing corresponding amounts of food-grade silicone, polyurethane resin, toughening resin, stabilizer, antioxidant and lubricant and extruding and granulating to obtain silicone masterbatch, and then mixing the silicone masterbatch with a silicone vulcanizer to obtain a material to be processed;

[0027] (3) Extruding the material to be processed into a silicone inner tube, then sleeve the metal spring on the outside of the silicone inner tube, and then coating part of the material to be processed on the outside of the metal spring by melt injection to form a silicone outer tube;

[0028] (4) Vulcanization is performed to obtain the silicone spring.

[0029] Optionally, after drying in step (1), the method further comprises plasma treating the metal spring and then coating the metal spring with a mixture of a silane coupling agent and glutaraldehyde to form a connecting layer.

[0030] Optionally, the plasma treatment is to use a spray gun of a vacuum plasma treatment equipment to spray an oxygen plasma beam on the surface of the metal spring, the distance between the spray gun and the surface of the metal spring is 10-15mm, and the movement speed of the spray gun relative to the metal spring is 30-40mm / s, and the movement speed refers to the speed of movement along the steel wire of the metal spring, and the material of the metal spring is selected from one of cast iron, steel or stainless steel.

[0031] Optionally, the vulcanization temperature of step (4) is 180-200°C.

[0032] According to another aspect of the present application, a bedding is provided, comprising the silicone spring described in any one of the above items.

[0033] Optionally, the bedding is a sofa or a mattress, and the silicone springs are evenly distributed inside the sofa or the mattress. The silicone springs of the present application are placed in the sofa or the mattress, and have the advantages of moderate deformation, high resilience, and high load-bearing capacity. The deformation consistency of the silicone springs under stress in the sofa and the mattress is high, which improves the user experience.

[0034] The beneficial effects of this application include but are not limited to:

[0035] 1. According to the silicone spring of the present application, the silicone material is set with the characteristics of the metal spring so that the elastic force of the silicone material is adapted to the elasticity of the metal spring, thereby maintaining good elasticity during multiple deformations, thereby improving the comfort and service life of the silicone spring.

[0036] 2. The silicone spring according to the present application has good mechanical strength and weather resistance, will not crack or delaminate under normal temperature conditions, and improves the coverage of the silicone material on the metal spring to achieve the best quiet and shock-absorbing effects.

[0037] 3. According to the silicone spring of the present application, the use of food-grade silicone can improve the safety of use, and the sodium alginate and chitosan added to the food-grade silicone can improve the antibacterial properties of the silicone material. At the same time, they can be evenly dispersed in the silicone material, thereby improving the adhesion to the metal spring and avoiding the detachment of the silicone material.

[0038] 4. According to the silicone spring of the present application, the connecting layer arranged on the surface of the metal spring can improve the wrapping of the silicone material on the metal spring, increase the integrity of the metal spring and the silicone material, so as to improve the overall elasticity and load-bearing capacity of the silicone spring and improve the comfort of use of the mattress or sofa. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0040] Figure 1 This is a three-dimensional diagram of the silicone spring involved in Example 2 of the present application;

[0041] Figure 2 is a cross-sectional view of a silicone spring according to an embodiment of the present application;

[0042] List of parts and reference numerals:

[0043] 1. Silicone inner tube; 2. Silicone outer tube; 3. Metal spring; 4. Thin end; 5. Thick end; 6. Reinforcement ring. DETAILED DESCRIPTION

[0044] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0045] Unless otherwise specified, the raw materials in the examples of this application were purchased through commercial channels.

[0046] Unless otherwise specified, the method used in the embodiments of the present application is a conventional method in the prior art. Figure 1 and 2 , which includes a thin end 4 and a thick end 5, the diameter of the thin end 4 is 50-60mm, the diameter of the thick end 5 is 80-90mm, the number of turns of the built-in metal spring 3 is 8, the wire diameter is 2.8-3.2mm, the thickness of the silicone inner tube 1 is 17mm, and the thickness of the silicone outer tube 2 is 20mm. Both ends are provided with reinforcing rings 6 extending inward and outward at the same time, the thickness of the reinforcing ring 6 on the thin end 4 side is not 15mm, and the thickness of the reinforcing ring 6 on the thick end 5 side of the independent spring is 25mm.

[0047] Example 1

[0048] This embodiment relates to a silicone material, which includes 80-100 parts of food-grade silicone, 20-30 parts of polyurethane resin, 10-15 parts of toughening resin, 1-2 parts of antioxidant, 1-1.5 parts of lubricant, and 1-2 parts of silicone vulcanizer;

[0049] The structural formula of the toughening resin is shown in Formula I:

[0050]

[0051] In Formula I, x is selected from any integer between 50 and 60, y is selected from any integer between 40 and 50, n is selected from any integer between 5 and 8, and R is selected from hydroxyl or carboxyl.

[0052] The preparation method of food grade silica gel is:

[0053] S1: mixing ethyl orthosilicate and sodium hydroxide solution, stirring and adding γ-aminopropyltrimethoxysilane to react and treat to obtain a silica gel matrix;

[0054] S2: Sodium alginate and chitosan are mixed and ground to obtain a modifier, which is dissolved in a solvent and then added to a silica gel matrix for ultrasonic oscillation dispersion. The mixture is heated at 60-75°C for 45-60 minutes to obtain food-grade silica gel, wherein sodium alginate and chitosan account for 3wt% and 2wt% of the silica gel matrix, respectively.

[0055] The antioxidant is tertiary butylhydroquinone; the lubricant is at least one of n-butyl stearate, methyl stearate, ethyl stearate, barium stearate, magnesium stearate, zinc stearate and aluminum stearate; and the silicone vulcanizer is a platinum vulcanizer.

[0056] The preparation method of the silicone material is to mix corresponding portions of food-grade silicone, polyurethane resin, toughening resin, stabilizer, antioxidant and lubricant and extrude and granulate to obtain silicone masterbatch, then mix the silicone masterbatch with silicone vulcanizer to obtain a material to be processed, and extrude and mold the material to be processed to obtain a silicone material with a thickness of 0.5 cm. The following silicone materials are prepared according to the above raw materials and preparation method, and the specific differences are as follows:

[0057] Silicone material 1#

[0058] It includes 100 parts of food-grade silicone, 30 parts of polyurethane resin, 15 parts of toughening resin, 2 parts of tert-butyl hydroquinone, 1.5 parts of ethyl stearate, and 2 parts of platinum vulcanizer; the toughening resin is a copolymer of ethylene and 6-heptene-1 alcohol, and the molar ratio of ethylene to 6-heptene-1 alcohol is 50:50 。

[0059] The preparation method of food grade silica gel is:

[0060] S1: 31.2 ml of ethyl orthosilicate and 150 ml of sodium hydroxide solution (0.01 mol / L) were mixed, stirred and 3.8 ml of γ-aminopropyltrimethoxysilane was added, heated to 40°C for reflux reaction for 10 h, then heated to 70°C for reflux reaction for 10 h, cooled, filtered under reduced pressure, washed with methanol solution three times, and dried to obtain a powdered silica gel matrix;

[0061] S2: Sodium alginate and chitosan are mixed and ground to obtain a modifier, which is dissolved in methanol and then added to a silica gel matrix for ultrasonic oscillation dispersion. The mixture is heated at 75°C for 45 minutes to obtain food-grade silica gel, in which sodium alginate and chitosan account for 3wt% and 2wt% of the silica gel matrix, respectively.

[0062] Silicone material 2#

[0063] The invention comprises 80 parts of food-grade silica gel, 20 parts of polyurethane resin, 10 parts of toughening resin, 1 part of tert-butylhydroquinone, 1 part of n-butyl stearate and 1 part of platinum vulcanizer; the toughening resin is a copolymer of ethylene and 10-undecenoic acid, and the molar ratio of ethylene to 10-undecenoic acid is 60:40.

[0064] The preparation method of food grade silica gel is:

[0065] S1: Same as silicone material 1#;

[0066] S2: Sodium alginate and chitosan are mixed and ground to obtain a modifier, which is dissolved in methanol and then added to a silica gel matrix for ultrasonic oscillation dispersion. The mixture is heated at 60°C for 60 minutes to obtain food-grade silica gel, in which sodium alginate and chitosan account for 3wt% and 2wt% of the silica gel matrix, respectively.

[0067] Silicone material 3#

[0068] The difference between it and silica gel material 1# is that 9-decene-1-ol is used instead of 6-heptene-1-ol, and the rest is the same as silica gel material 1#.

[0069] Comparison of silicone material D1#

[0070] The difference between it and silicone material 1# is that the toughening resin is a copolymer of ethylene and acrylic acid, the molar ratio of ethylene to acrylic acid is 60:40, and the rest is the same as silicone material 1#.

[0071] Comparison of silicone material D2#

[0072] The difference between it and silicone material 1# is that the toughening resin is 20 parts, and the rest is the same as silicone material 1#.

[0073] Comparison of silicone material D3#

[0074] The difference between it and silicone material 1# is that the polyurethane resin is 40 parts, and the rest is the same as silicone material 1#.

[0075] Test Example 1 Mechanical properties of silicone materials

[0076] The compressive strength (GBT7757-1993), tensile strength (GB / T528-2009), elongation at break (GB / T528-2009) and rebound rate (GB / T1681) of each silicone material prepared as described above were tested. The results are shown in the table below.

[0077] Table 1

[0078]

[0079] According to the data in the above table, the silicone material of the present application has good mechanical strength and elasticity, and can meet the needs of practical applications.

[0080] According to the comparison between silicone material 1# and comparative silicone material D1#, when the toughening resin does not contain carboxyl or hydroxyl functional groups, the mechanical properties of the silicone material are significantly reduced, especially the rebound rate is significantly reduced, which will affect the coordination between the silicone material and the metal spring, making it difficult for the silicone material to change rapidly with the strain of the metal spring during long-term use, which can easily cause cracking or delamination of the silicone material.

[0081] According to the comparison between silicone material 1# and comparative silicone material D2#, it can be seen that when the amount of toughening resin added is large, the proportion of polyurethane resin will be reduced accordingly, which will also reduce the mechanical strength and resilience of the silicone material; according to the comparison between silicone material 1# and comparative silicone material D3#, it can be seen that with the increase in the amount of polyurethane resin added, the resilience of the silicone material is not greatly improved, but the tensile strength is significantly reduced. The reason for this is that with the increase in the amount of polyurethane resin added, the problem of poor compatibility with food-grade silicone is more significant, which makes the material easier to break when subjected to stress.

[0082] Test Example 2 Antibacterial Performance

[0083] Staphylococcus aureus, Escherichia coli and Aspergillus cyanobacterium were used as test strains, and the bacteria were suspended in a phosphate buffer with a concentration of 100umol / L and a pH value of 7 to prepare bacterial solutions. The above-mentioned silica gel materials were immersed in the bacterial solutions and shaken to make the bacterial solutions fully contact with the silica gel spring. After standing for 30 minutes, the silica gel spring was taken out, and the supernatant was taken out by centrifugation. The supernatant was diluted with a phosphate buffer with a concentration of 100umol / L and a pH value of 7, and the dilution was added to the culture medium. The culture was carried out at a temperature of 37°C for 24 hours, and the number of bacterial colonies was counted. The results are shown in the following table.

[0084] Table 2

[0085]

[0086]

[0087] Example 2

[0088] The present embodiment relates to a silicone spring and a preparation method thereof. The silicone spring comprises a silicone material and a metal spring coated in the silicone material. The silicone material comprises, by weight, 80-100 parts of food-grade silicone, 20-30 parts of polyurethane resin, 10-15 parts of toughening resin, 1-2 parts of antioxidant, 1-1.5 parts of lubricant, and 1-2 parts of silicone vulcanizer.

[0089] The structural formula of the toughening resin is shown in Formula I:

[0090]

[0091] In Formula I, x is selected from any integer between 50 and 60, y is selected from any integer between 40 and 50, n is selected from any integer between 5 and 8, and R is selected from hydroxyl or carboxyl.

[0092] The preparation method of food grade silica gel is:

[0093] S1: mixing ethyl orthosilicate and sodium hydroxide solution, stirring and adding γ-aminopropyltrimethoxysilane to react and treat to obtain a silica gel matrix;

[0094] S2: Sodium alginate and chitosan are mixed and ground to obtain a modifier, which is dissolved in a solvent and then added to a silica gel matrix for ultrasonic oscillation dispersion. The mixture is heated at 60-75°C for 45-60 minutes to obtain food-grade silica gel, wherein sodium alginate and chitosan account for 3wt% and 2wt% of the silica gel matrix, respectively.

[0095] The preparation method of the silicone spring comprises the following steps:

[0096] (1) Cleaning and drying the metal spring 3;

[0097] (2) mixing corresponding amounts of food-grade silicone, polyurethane resin, toughening resin, stabilizer, antioxidant and lubricant and extruding and granulating to obtain silicone masterbatch, and then mixing the silicone masterbatch with a silicone vulcanizer to obtain a material to be processed;

[0098] (3) Extruding the material to be processed into a silicone inner tube 1, then sleeve the metal spring on the outside of the silicone inner tube 1, and then coating part of the material to be processed on the outside of the metal spring by melt injection to form a silicone outer tube 2;

[0099] (4) Vulcanize at 180-200°C to obtain a silicone spring.

[0100] Different silicone springs were prepared using the above preparation method, in which the metal springs were all made of steel. The specific differences are as follows:

[0101] Silicone spring 1#

[0102] The silicone material 1# of Example 1 was prepared according to the above preparation method, and the vulcanization temperature was 200° C. to obtain a silicone spring 1#.

[0103] Silicone spring 2#

[0104] The silicone material 1# of Example 1 was prepared according to the above preparation method, and the vulcanization temperature was 180° C. to obtain a silicone spring 1#.

[0105] Silicone spring 3#

[0106] The difference from silicone spring 1# is that silicone material 3# is used, and the rest is the same as silicone spring 1#.

[0107] Silicone spring 4#

[0108] The difference from Silicone Spring 1# is that after drying in step (1), the surface of the metal spring is treated by spraying an oxygen plasma beam with a spray gun of a vacuum plasma treatment device. The distance between the spray gun and the surface of the metal spring is 10 mm, and the movement speed of the spray gun relative to the metal spring is 40 mm / s. Then, a mixture of 1 part of bis(γ-triethoxysilylpropyl) disulfide and 1.3 parts of glutaraldehyde is coated to form a connecting layer. The rest is the same as Silicone Spring 1#.

[0109] Silicone spring 5#

[0110] The difference from Silicone Spring 1# is that after drying in step (1), the surface of the metal spring is treated by spraying an oxygen plasma beam with a spray gun of a vacuum plasma treatment device. The distance between the spray gun and the surface of the metal spring is 15 mm, and the movement speed of the spray gun relative to the metal spring is 30 mm / s. Then, a mixture of 2 parts of bis(γ-triethoxysilylpropyl)tetrasulfide and 0.5 parts of glutaraldehyde is coated to form a connecting layer. The rest is the same as Silicone Spring 1#.

[0111] Silicone spring 6#

[0112] The difference from silicone spring 5# is that γ-aminopropyltrimethoxysilane is used to replace bis(γ-triethoxysilylpropyl)tetrasulfide, and the rest is the same as silicone spring 1#.

[0113] Silicone spring 7#

[0114] The difference from silicone spring 5# is that the connection layer does not include bis(γ-triethoxysilylpropyl)tetrasulfide, and the rest is the same as silicone spring 5#.

[0115] Silicone spring 8#

[0116] The difference between this embodiment and silicone spring 5# is that glutaraldehyde is not included in the connecting layer, and the rest is the same as silicone spring 5#.

[0117] Silicone spring 9#

[0118] The difference from Silicone Spring 5# is that a mixture of 2 parts of bis(γ-triethoxysilylpropyl)tetrasulfide and 0.5 parts of glutaraldehyde is directly coated on the dried metal spring to form a connecting layer, and the metal spring is not plasma treated. The rest is the same as Silicone Spring 5#.

[0119] Comparison of silicone spring D1#

[0120] The difference from silicone spring 1# is that it uses contrast silicone material D1#, and the rest is the same as silicone spring 1#.

[0121] Comparison of silicone spring D2#

[0122] The difference from silicone spring 1# is that it uses contrast silicone material D2#, and the rest is the same as silicone spring 1#.

[0123] Comparison of silicone spring D3#

[0124] The difference from silicone spring 1# is that it uses contrast silicone material D3#, and the rest is the same as silicone spring 1#.

[0125] Test Example 3 Spring Mechanical Properties

[0126] The above silicone spring was subjected to a compression-rebound test. A universal testing machine was used to apply a force of 50 kN to the silicone spring. The external force was then removed to allow it to recover. The compression test was repeated until the silicone spring cracked or the silicone material fell off the metal spring. The number of times the silicone spring could be repeatedly compressed and rebounded, as well as the deformation rate of the silicone spring when the silicone spring cracked or the silicone material fell off the metal spring were recorded. The results are shown in the table below. The deformation rate is calculated as: [(initial silicone spring height-final silicone spring height) / initial silicone spring height]×100%.

[0127] Weather resistance: The silicone spring is placed at 80°C and 60% humidity for 15 days, and then placed at 80°C and dried in a vacuum environment for 1 day as one test cycle. Each silicone spring is subjected to three test cycles to observe whether the silicone material coated on the silicone spring is powdered, and then 100 compression-rebound tests are carried out to observe whether the silicone material coated on the silicone spring falls off. The test results are shown in the table below.

[0128] Table 3

[0129]

[0130] The above is only the embodiment of the present application, and the protection scope of the present application is not limited by these specific embodiments, but is determined by the claims of the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the technical ideas and principles of the present application should be included in the protection scope of the present application.

Claims

1. A silicone spring, characterized in that: The silicone spring comprises a silicone material and a metal spring coated in the silicone material. The silicone material comprises, by weight, 80-100 parts of food-grade silicone, 20-30 parts of polyurethane resin, 10-15 parts of toughening resin, 1-2 parts of antioxidant, 1-1.5 parts of lubricant, and 1-2 parts of silicone vulcanizer; The structural formula of the toughening resin is shown in Formula I: In Formula I, x is selected from any integer between 50 and 60, y is selected from any integer between 40 and 50, n is selected from any integer between 5 and 8, and R is selected from hydroxyl or carboxyl.

2. The silicone spring according to claim 1, characterized in that: The preparation method of the food-grade silica gel is: S1: mixing ethyl orthosilicate and sodium hydroxide solution, stirring and adding γ-aminopropyltrimethoxysilane to react and treat to obtain a silica gel matrix; S2: Sodium alginate and chitosan are mixed and ground to obtain a modifier, the modifier is dissolved in a solvent, and then added to a silica gel matrix for ultrasonic oscillation dispersion, and heated at 60-75° C. for reaction for 45-60 minutes to obtain the food-grade silica gel, wherein the sodium alginate and chitosan account for 3wt% and 2wt% of the silica gel matrix, respectively.

3. The silicone spring according to claim 1, characterized in that: A connection layer formed by a silane coupling agent and glutaraldehyde is also arranged between the metal spring and the silicone material.

4. The silicone spring according to claim 1, characterized in that: The silane coupling agent is 1-2 parts, the glutaraldehyde is 0.5-1.3 parts, and the silane coupling agent and glutaraldehyde are coated on the surface of the metal spring to form the connection layer.

5. The silicone spring according to claim 1, characterized in that: The silane coupling agent is selected from at least one of bis(γ-triethoxysilylpropyl)tetrasulfide and bis(γ-triethoxysilylpropyl)disulfide.

6. The silicone spring according to claim 1, characterized in that: The antioxidant is tert-butylhydroquinone; The lubricant is at least one of n-butyl stearate, methyl stearate, ethyl stearate, barium stearate, magnesium stearate, zinc stearate, and aluminum stearate; The silicone vulcanizing agent is a platinum vulcanizing agent.

7. A method for preparing a silicone spring according to any one of claims 1 to 6, characterized in that: The steps include: (1) cleaning and drying the metal spring; (2) mixing corresponding amounts of food-grade silicone, polyurethane resin, toughening resin, stabilizer, antioxidant and lubricant and extruding and granulating to obtain silicone masterbatch, and then mixing the silicone masterbatch with a silicone vulcanizer to obtain a material to be processed; (3) Extruding the material to be processed into a silicone inner tube, then sleeve the metal spring on the outside of the silicone inner tube, and then coating part of the material to be processed on the outside of the metal spring by melt injection to form a silicone outer tube; (4) Vulcanization is performed to obtain the silicone spring.

8. The preparation method according to claim 7, characterized in that: After step (1) drying, the method further includes the steps of plasma treating the metal spring and then coating the metal spring with a mixture of a silane coupling agent and glutaraldehyde to form a connecting layer.

9. The preparation method according to claim 7, characterized in that: The vulcanization temperature of step (4) is 180-200°C.

10. A bedding, characterized in that: It comprises the silicone spring according to any one of claims 1 to 6.

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