Silica gel spring for mattress as well as preparation method and application of silica gel spring

Abstract

The invention relates to a silica gel spring for a mattress as well as a preparation method and application of the silica gel spring, and belongs to the technical field of spring mattresses. The silica gel spring for the mattress comprises an independent spring and a silica gel material wrapping the outer side of the independent spring, and the silica gel material is prepared from, by weight, 100 parts of methyl vinyl silicone rubber, 8-12 parts of polyvinyl alcohol, 10-15 parts of silane coupling agent modified white carbon black, 2-4 parts of methyl silicone oil, 1-3 parts of 2, 5-dimethyl-2, 5-dihexane and 0.1-0.2 part of zinc stearate. According to the silica gel spring, the silica gel material has good supporting performance and rebound resilience, the number of turns of an independent spring in the silica gel spring can be reduced, the rebound resilience and supporting performance of the silica gel spring are guaranteed while the production cost is reduced, and the silica gel material has good deflection resistance and is longer in service life; and noise caused by contact of independent springs in adjacent silica gel springs due to damage is not easily generated.

Description

Technical Field

[0001] The present application relates to a silicone spring for a mattress and a preparation method and application thereof, belonging to the technical field of spring mattresses. Background Art

[0002] Spring mattress is a more commonly used mattress at present. It usually includes a mattress core and a surface layer such as fabric or soft mat covering the outside of the mattress core. The mattress core is composed of several vertical springs. When the spring is subjected to force, the spring is compressed. When the pressure disappears, the spring automatically rebounds. The spring mattress has good supporting force and rebound force. Compared with ordinary hard mattresses, spring mattresses are more comfortable to use.

[0003] The spring structure in the spring mattress has evolved from the original whole-mesh spring, such as the brushed wire spring, Bonnier round spring, Merlot spring, and Metso spring, to the more popular independent bag spring today. Each spring is independently configured so that its telescopic support is independent, which can effectively avoid the noise problem caused by the internal action of the traditional whole-mesh spring, especially the anti-interference ability is greatly improved.

[0004] In order to ensure that the mattress has good resilience and support, the independent bag springs in the prior art require that each independent spring has a larger wire diameter and has higher requirements for the number of turns. In addition, in order to ensure that the mattress has good fit and sensitivity, the caliber of the spring cannot be too large. This will result in a very high density of independent springs in a mattress of the same area and a large amount of springs. On the one hand, this will lead to a high production cost. On the other hand, the mattress is heavy and inconvenient to transport and install.

[0005] In addition, in order to reduce the noise generated by the contact between adjacent springs and further improve the resilience and support of the mattress, thereby improving the comfort of using the mattress, it is possible to consider using silicone material to cover the springs. However, the existing silicone material has good anti-deformation performance, but its support and resilience are insufficient, resulting in the problem of insufficient resilience when it is used in a spring mattress in conjunction with the spring.

[0006] Therefore, how to optimize the silicone material wrapped around the outside of the spring to improve the support and resilience of the silicone material while ensuring the original good deformation resistance and flexural resistance of the silicone material, thereby reducing the amount of springs and thus reducing the cost of the springs, while still having the required resilience and support, and greatly improving the user experience, is an important issue that urgently needs to be solved in the design, manufacturing and industrial production of high-quality spring mattresses. Summary of the invention

[0007] In order to solve the above problems, a silicone spring for a mattress and a preparation method and application thereof are provided. The silicone material provided in the present application has good support and resilience, can reduce the number of coils of the independent spring in the silicone spring, reduce the production cost while ensuring the resilience and support performance of the silicone spring, and the silicone material has good flexural resistance, a longer service life, and is not easy to be damaged, resulting in the independent springs in adjacent silicone springs contacting and generating noise.

[0008] The present application provides a silicone spring for a mattress, the silicone spring comprising an independent spring and a silicone material coated on the outside of the independent spring, and the silicone material comprises, by weight: 100 parts of methyl vinyl silicone rubber, 8-12 parts of polyvinyl alcohol, 10-15 parts of silane coupling agent modified white carbon black, 2-4 parts of methyl silicone oil, 1-3 parts of 2,5-dimethyl-2,5-bishexane, and 0.1-0.2 parts of zinc stearate.

[0009] Optionally, the methyl vinyl silicone rubber is modified methyl vinyl silicone rubber, and the preparation method of the modified methyl vinyl silicone rubber includes the step of blending the methyl vinyl silicone rubber with ethylene propylene diene monomer rubber and iron oxide, wherein the addition amount of the ethylene propylene diene monomer rubber is 10~30wt% of the methyl vinyl silicone rubber, and the addition amount of the iron oxide is 1~5wt% of the methyl vinyl silicone rubber.

[0010] Optionally, the relative molecular weight of the methyl vinyl silicone rubber is 450,000 to 500,000, and the vinyl content is 1.8 to 3wt%.

[0011] Optionally, the preparation method of the silane coupling agent modified white carbon black comprises: 1) Dissolve the silane coupling agent in 95-98 vol% ethanol solvent and let it stand for 2-4 hours to obtain a silane coupling agent solution; 2) Add white carbon black to the silane coupling agent solution and perform ultrasonic dispersion treatment; 3) heating to volatilize the solvent under continuous stirring, and obtaining the silane coupling agent-modified white carbon black after drying.

[0012] Optionally, the amount of the silane coupling agent used is 5-15wt% of the white carbon black.

[0013] Optionally, the white carbon black is fumed white carbon black, and the particle size of the white carbon black is 10-20 nm.

[0014] Optionally, after the preparation of the silane coupling agent modified silica, a post-treatment step of premixing it with methyl vinyl silicone rubber is included, and the amount of methyl vinyl silicone rubber in the premix is ​​not less than 5 times the mass of the modified silica.

[0015] Optionally, the post-processing step includes: 1) Add methyl vinyl silicone rubber into a vacuum kneader and knead for 2 to 5 minutes; 2) Add the modified silica into the vacuum kneader at least three times, kneading for at least 10 minutes each time; 3) After the treatment is completed, take it out to obtain the modified silica after post-treatment.

[0016] The present application provides a method for preparing the above-mentioned silicone spring for a mattress, the preparation method comprising the following steps: 1) cleaning and drying the independent spring; 2) Mixing methyl vinyl silicone rubber, polyvinyl alcohol, silane coupling agent modified white carbon black, methyl silicone oil, 2,5-dimethyl-2,5-bishexane and zinc stearate to obtain a raw material to be processed; 3) After the raw material to be processed is prepared into an inner cylinder, an independent spring is sleeved on the outside of the inner cylinder, and then the material to be processed is covered on the outside of the inner cylinder to form an outer cylinder; 4) After vulcanization treatment, the silicone spring for the mattress is obtained.

[0017] The present application provides the use of the above-mentioned silicone spring for mattresses in the preparation of spring mattresses.

[0018] The beneficial effects of this application include but are not limited to: The silicone material provided in the present application has good support and resilience, and can reduce the number of coils of the independent spring in the silicone spring, thereby reducing production costs while ensuring the resilience and support performance of the silicone spring. The silicone material also has good flexural resistance, a longer service life, and is not prone to breakage, causing the independent springs in adjacent silicone springs to contact and generate noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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: Figure 1 It is a three-dimensional diagram of a first specific implementation mode of a silicone spring involved in an embodiment of the present application; Figure 2 It is a vertical cross-sectional view of a first specific implementation mode of a silicone spring involved in an embodiment of the present application; Figure 3 It is a vertical cross-sectional view of a second specific implementation manner of the silicone spring involved in an embodiment of the present application.

[0020] List of parts and reference numerals: Inner tube-1, outer tube-2, independent spring-3, thin end-4, thick end-5, reinforcement ring-6. DETAILED DESCRIPTION

[0021] The present application is described in detail below in conjunction with examples, but the present application is not limited to these examples. Unless otherwise specified, the raw materials and reagents in the examples of the present application are purchased through commercial channels.

[0022] The present application scheme is described below through specific embodiments.

[0023] Example 1 refer to Figures 1 to 3 In this embodiment, a silicone spring structure is provided, including: The inner cylinder is a truncated cone with a through hole in the middle; The outer cylinder is a truncated cone with a receiving space in the middle, and the receiving space is used to place the inner cylinder; An independent spring comprises a thin end and a thick end, the diameter of the thick end is larger than the diameter of the thin end, the independent spring is arranged on the outer edge of the inner tube, and the independent spring is completely covered by the outer tube.

[0024] The silicone spring provided by the present application has an inner tube and an outer tube both of which are truncated cone-shaped, and the independent spring inside the outer tube also conforms to the truncated cone shape. The independent spring includes a thin end and a thick end. The thin end faces upward to ensure better fit while having higher adjustment sensitivity and better anti-deformation effect to ensure the flatness of the mattress, while the thick end faces downward to ensure better support stability. The thick end placed downward in the mattress can provide sufficient rebound force while reducing the number of elastic parts required for the mattress, thereby taking into account fit, adjustment sensitivity and support stability, and ensuring that the rebound force meets the requirements while reducing the use density of silicone springs in the mattress, which can not only reduce the weight of the mattress to facilitate transportation and installation, but also reduce the amount of independent springs to reduce production costs.

[0025] As an implementation method, the diameter of the thin end of the independent spring is 50-60 mm, and the diameter of the thick end of the independent spring is 80-90 mm.

[0026] The diameter of the taper port is set within the relatively small range mentioned above, which can ensure that the mattress has good adjustment sensitivity. If the diameter of the taper port is too large, the adjustment sensitivity will decrease and the fit will be poor, which will lead to poor comfort of the spring mattress, and when the local force is large, it will also lead to large deformation and insufficient resilience of the mattress; if the diameter of the taper port is too small, the stability of the mattress after the force is poor.

[0027] The diameter of the thick end is set within the relatively large range mentioned above, which can ensure that the mattress has good support stability. If the diameter of the thick end is too small, the support stability will be poor, and the use density of independent springs will increase, and the cost will also increase; if the diameter of the thick end is too large, the resilience of the silicone spring will be poor.

[0028] As an implementation method, the number of turns of the independent spring is 4 to 10 turns. In the present application, an outer cylinder is coated on the outside of the independent spring, and the structure of the inner cylinder can significantly improve the resilience of the silicone spring and achieve a significant noise reduction effect. Therefore, the number of turns of the independent spring can be reduced to a relatively low number. In the case of 4 turns, it can also maintain a good resilience, and make the mattress more supportive, and the deformation process of the mattress during use is more comfortable.

[0029] As an implementation method, the wire diameter of the independent spring is 2.8~3.2mm.

[0030] The wire diameter within the above range is adopted in the present application scheme, and the inner tube and the outer tube are matched to achieve both good comfort and resilience.

[0031] As an implementation mode, the thickness of the inner cylinder is not less than 16 mm.

[0032] If the thickness of the inner cylinder is too low, the enhancement of the rebound force will be relatively poor. If the thickness of the inner cylinder is too thick, it will lead to increased costs and reduced adjustment sensitivity. Those skilled in the art can make adjustments as needed.

[0033] As an implementation mode, the thickness of the outer cylinder is not less than 18 mm.

[0034] If the thickness of the outer tube is too low, the wrapping property of the independent spring will be poor. The independent spring will be easily damaged during repeated deformation and use. If the outer tube is too thin, it will cause contact and noise between adjacent independent springs.

[0035] It should be noted that the thickness of the inner tube and the outer tube can be uniform or non-uniform, for example Figure 2 The middle is uniform thickness, Figure 3 The thickness of the inner cylinder and the outer cylinder is not uniform. The definition of the thickness of the inner cylinder and the outer cylinder is clear to those skilled in the art, that is, Figure 2 or Figure 3 The thickness of the inner cylinder or outer cylinder reflected in the middle section is a conventional concept in the art.

[0036] It should be noted that there is no specific limitation on the through hole in the middle of the inner cylinder. Figure 1 and Figure 2 In the first specific embodiment shown, the thickness of the inner cylinder is uniform. For example, in order to facilitate processing and manufacturing, a through hole is opened in the middle of the inner cylinder. Figure 3 In the second specific embodiment shown, it is configured in a cylindrical shape.

[0037] The reason for providing the through holes is to ensure the air permeability of the mattress, so those skilled in the art can set the shape of the through holes according to other needs while meeting the air permeability requirements.

[0038] As an implementation method, the independent spring is a high manganese carbon steel spring.

[0039] Commonly used in this field include ordinary carbon steel, vanadium steel, fine steel, etc. High manganese carbon steel has better life and elasticity.

[0040] As an implementation mode, both ends of the outer cylinder are provided with reinforcement rings extending both inwardly and outwardly.

[0041] By arranging reinforcement rings at both ends of the outer tube, the support and fit of the silicone spring can be further enhanced, and the thickness and width of the reinforcement ring on the thin end of the independent spring are reasonably set and not too large, thereby ensuring better mattress adjustment sensitivity, while the thickness and width of the reinforcement ring on the thick end of the independent spring are relatively large, which can improve the support stability of the silicone spring while significantly improving its resilience.

[0042] As an implementation mode, the thickness of the reinforcement ring on the thin end side of the independent spring is not less than 15 mm, and the thickness of the reinforcement ring on the thick end side of the independent spring is not less than 25 mm.

[0043] If the thickness of the reinforcement rings at both ends is too low, the resilience of the silicone spring will be poor, and reinforcement rings of a certain thickness can also protect the independent spring.

[0044] As an implementation method, the thickness of the reinforcement ring on the thin end side of the independent spring is 15-25 mm, and the thickness of the reinforcement ring on the thick end side of the independent spring is 25-35 mm. When the thickness of the reinforcement rings at both ends is within the above range, the silicone spring has good resilience.

[0045] As an implementation mode, the width of the reinforcement ring on the thin end side of the independent spring is not less than 20 mm, and the width of the reinforcement ring on the thick end side of the independent spring is not less than 40 mm.

[0046] If the width of the reinforcement rings at both ends is too narrow, the fixing stability of the silicone spring in the mattress will be poor. If the width of the reinforcement ring on the thin end of the independent spring is too large, the adjustment sensitivity of the mattress will be reduced. If the width of the reinforcement ring on the thick end of the independent spring is too large, the manufacturing cost will be higher.

[0047] As an implementation method, the width of the reinforcement ring on the thin end of the independent spring is 20-30 mm, and the width of the reinforcement ring on the thick end of the independent spring is 40-50 mm. When the widths of the reinforcement rings at both ends are within the above range, the silicone spring has better support stability.

[0048] The definition of the thickness and width of the reinforcement ring is further explained, such as Figure 2 or Figure 3As shown in , the reinforcement ring is an additional structure at both ends, which has a certain thickness in the vertical height of the cross section and a certain width in the left and right directions, especially according to Figure 1 The stereoscopic diagram in the figure can more intuitively show its width attribute and thickness attribute, which is a common concept in this field.

[0049] Example 2 The silicone spring includes an independent spring and a silicone material coated on the outside of the independent spring. The present embodiment provides the silicone material of the inner tube and the outer tube of the silicone spring in embodiment 1. The silicone material includes, by weight: 100 parts of methyl vinyl silicone rubber, 8-12 parts of polyvinyl alcohol, 10-15 parts of silane coupling agent modified white carbon black, 2-4 parts of methyl silicone oil, 1-3 parts of 2,5-dimethyl-2,5-bishexane, and 0.1-0.2 parts of zinc stearate.

[0050] As an embodiment, the methyl vinyl silicone rubber is modified methyl vinyl silicone rubber, and the preparation method of the modified methyl vinyl silicone rubber includes the step of blending the methyl vinyl silicone rubber with ethylene propylene diene monomer rubber and iron oxide, wherein the amount of ethylene propylene diene monomer rubber added is 10-30wt% of the methyl vinyl silicone rubber, and the amount of iron oxide added is 1-5wt% of the methyl vinyl silicone rubber.

[0051] As an implementation method, the relative molecular weight of the methyl vinyl silicone rubber is 450,000 to 500,000, and the vinyl content is 1.8 to 3 wt%.

[0052] As an embodiment, the preparation method of silane coupling agent modified white carbon black comprises: 1) Dissolve the silane coupling agent in 95-98 vol% ethanol solvent and let it stand for 2-4 hours to obtain a silane coupling agent solution; 2) Add white carbon black to the silane coupling agent solution and perform ultrasonic dispersion treatment; 3) The solvent is heated and volatilized under continuous stirring, and the silane coupling agent-modified white carbon black is obtained after drying.

[0053] As an implementation method, the amount of silane coupling agent used is 5-15wt% of white carbon black.

[0054] As an implementation method, the white carbon black is fumed white carbon black, and the particle size of the white carbon black is 10-20 nm.

[0055] As an embodiment, after the preparation of the silane coupling agent modified silica, a post-treatment step of premixing it in methyl vinyl silicone rubber is included, and the amount of methyl vinyl silicone rubber in the premix is ​​not less than 5 times the mass of the modified silica.

[0056] As an embodiment, the post-processing step includes: 1) Add methyl vinyl silicone rubber into a vacuum kneader and knead for 2 to 5 minutes; 2) Add the modified silica into the vacuum kneader at least three times, kneading for at least 10 minutes each time; 3) After the treatment is completed, take it out to obtain the modified silica after post-treatment.

[0057] A method for preparing the above-mentioned silicone spring for a mattress is further provided, comprising the following steps: 1) Clean and dry the independent spring; 2) Mixing methyl vinyl silicone rubber, polyvinyl alcohol, silane coupling agent modified white carbon black, methyl silicone oil, 2,5-dimethyl-2,5-bishexane and zinc stearate to obtain a raw material to be processed; 3) After the raw material to be processed is prepared into an inner cylinder, an independent spring is sleeved on the outside of the inner cylinder, and then the material to be processed is covered on the outside of the inner cylinder to form an outer cylinder; 4) After vulcanization, the silicone springs used in mattresses are obtained.

[0058] The following silicone spring samples were prepared according to the structure of the above-mentioned silicone spring, the composition of the silicone material and the preparation method, wherein the structures of the silicone springs are the same.

[0059] The structure of the silicone spring includes: an inner cylinder, which is a truncated cone with a through hole in the middle; an outer cylinder, which is a truncated cone with a receiving space in the middle, and the receiving space is used to place the inner cylinder; an independent spring, which includes a thin end and a thick end, the diameter of the thick end is larger than the diameter of the thin end, and the independent spring is arranged at the outer edge of the inner cylinder, and the independent spring is completely covered by the outer cylinder. The diameter of the thin end of the independent spring is 55mm, the diameter of the thick end of the independent spring is 85mm, the number of coils of the independent spring is 5, the wire diameter of the independent spring is 3.0mm, the thickness of the inner cylinder is 16mm, the thickness of the outer cylinder is 18mm, the independent spring is a high manganese carbon steel spring, and both ends of the outer cylinder are provided with reinforcing rings extending inward and outward at the same time, the thickness of the reinforcing ring on the thin end side of the independent spring is 15mm, the thickness of the reinforcing ring on the thick end side of the independent spring is 25mm, the width of the reinforcing ring on the thin end side of the independent spring is 20mm, and the width of the reinforcing ring on the thick end side of the independent spring is 40mm.

[0060] It should be noted that the silicone spring also includes a reinforcing ring structure at the upper and lower ends, which can be processed and prepared by conventional processing methods in the art, such as preparing the reinforcing ring structure and fixing the reinforcing ring structure to the inner tube and the outer tube before vulcanization, and finally performing vulcanization to obtain the silicone spring. It should be noted that in this embodiment, the raw material of the reinforcing ring is the same as that of the inner tube and the outer tube.

[0061] The differences in the raw materials used for the inner and outer cylinders, namely the silicone materials, are as follows: Silicone spring #1 The silicone materials of the inner tube and the outer tube of the silicone spring include, by weight: 100 parts of methyl vinyl silicone rubber, 10 parts of polyvinyl alcohol, 12 parts of silane coupling agent modified white carbon black, 3 parts of methyl silicone oil, 2 parts of 2,5-dimethyl-2,5-bishexane, and 0.15 parts of zinc stearate.

[0062] Among them, the methyl vinyl silicone rubber is modified methyl vinyl silicone rubber, which is obtained by blending methyl vinyl silicone rubber with ethylene propylene diene rubber and iron oxide. The addition amount of ethylene propylene diene rubber is 20wt% of the methyl vinyl silicone rubber, and the addition amount of iron oxide is 3wt% of the methyl vinyl silicone rubber. The relative molecular weight of the methyl vinyl silicone rubber used is 450,000 to 500,000, and the vinyl content is 2wt%.

[0063] The preparation method of silane coupling agent modified white carbon black includes: 1) dissolving the silane coupling agent in 96 vol% ethanol solvent, standing for 3 hours, and obtaining a silane coupling agent solution; 2) adding white carbon black to the silane coupling agent solution, and performing ultrasonic dispersion treatment; 3) heating and volatilizing the solvent under continuous stirring, and obtaining silane coupling agent modified white carbon black after drying, wherein the amount of the silane coupling agent is 10 wt% of the white carbon black, the white carbon black is gas phase white carbon black, the particle size of the white carbon black is 10-20 nm, and the silane coupling agent is bis(γ-triethoxysilylpropyl)tetrasulfide.

[0064] After the preparation of the silane coupling agent modified silica is completed, a post-treatment step is also included, in which the silane coupling agent is pre-mixed in methyl vinyl silicone rubber, and the amount of methyl vinyl silicone rubber used is 5 times the mass of the modified silica, specifically including: 1) adding the methyl vinyl silicone rubber into a vacuum kneader and kneading for 3 minutes; 2) adding the modified silica into the vacuum kneader in 3 times, kneading for 10 minutes each time; 3) taking it out after the treatment is completed to obtain the post-treated modified silica.

[0065] The preparation method of the silicone spring comprises the following steps: 1) Clean and dry the independent spring; 2) Mixing modified methyl vinyl silicone rubber, polyvinyl alcohol, pre-treated silane coupling agent modified white carbon black, methyl silicone oil, 2,5-dimethyl-2,5-bishexane and zinc stearate to obtain a raw material to be processed; 3) After the raw material to be processed is made into the shape of an inner cylinder, an independent spring is sleeved on the outside of the inner cylinder, and then the material to be processed is covered on the outside of the inner cylinder to form an outer cylinder; 4) The silicone spring is obtained after vulcanization treatment, the vulcanization temperature is 123°C, and the vulcanization time is 10 min.

[0066] Silicone spring #2 The silicone materials of the inner tube and the outer tube of the silicone spring include, by weight: 100 parts of methyl vinyl silicone rubber, 8 parts of polyvinyl alcohol, 10 parts of silane coupling agent modified white carbon black, 2 parts of methyl silicone oil, 1 part of 2,5-dimethyl-2,5-bishexane, and 0.1 part of zinc stearate.

[0067] Among them, the methyl vinyl silicone rubber is modified methyl vinyl silicone rubber, which is obtained by blending methyl vinyl silicone rubber with ethylene propylene diene rubber and iron oxide. The addition amount of ethylene propylene diene rubber is 10wt% of the methyl vinyl silicone rubber, and the addition amount of iron oxide is 1wt% of the methyl vinyl silicone rubber. The relative molecular weight of the methyl vinyl silicone rubber used is 450,000 to 500,000, and the vinyl content is 3wt%.

[0068] The preparation method of silane coupling agent modified white carbon black includes: 1) dissolving the silane coupling agent in 95 vol% ethanol solvent, standing for 2 hours, and obtaining a silane coupling agent solution; 2) adding white carbon black to the silane coupling agent solution, and performing ultrasonic dispersion treatment; 3) heating and volatilizing the solvent under continuous stirring, and obtaining silane coupling agent modified white carbon black after drying, wherein the amount of the silane coupling agent is 5 wt% of the white carbon black, the white carbon black is fumed white carbon black, the particle size of the white carbon black is 10-20 nm, and the silane coupling agent is bis(γ-triethoxysilylpropyl) disulfide.

[0069] After the preparation of the silane coupling agent modified silica is completed, a post-treatment step is also included, in which the silane coupling agent is pre-mixed in methyl vinyl silicone rubber, and the amount of methyl vinyl silicone rubber is 10 times the mass of the modified silica, specifically including: 1) adding the methyl vinyl silicone rubber into a vacuum kneader and kneading for 2 minutes; 2) adding the modified silica into the vacuum kneader in 5 times, kneading for 12 minutes each time; 3) taking it out after the treatment is completed to obtain the post-treated modified silica.

[0070] The preparation method of the silicone spring comprises the following steps: 1) Clean and dry the independent spring; 2) Mixing modified methyl vinyl silicone rubber, polyvinyl alcohol, pre-treated silane coupling agent modified white carbon black, methyl silicone oil, 2,5-dimethyl-2,5-bishexane and zinc stearate to obtain a raw material to be processed; 3) After the raw material to be processed is made into the shape of an inner cylinder, an independent spring is sleeved on the outside of the inner cylinder, and then the material to be processed is covered on the outside of the inner cylinder to form an outer cylinder; 4) The silicone spring is obtained after vulcanization treatment, the vulcanization temperature is 120°C, and the vulcanization time is 5 minutes.

[0071] Silicone Spring #3 The silicone materials of the inner tube and the outer tube of the silicone spring include, by weight: 100 parts of methyl vinyl silicone rubber, 12 parts of polyvinyl alcohol, 15 parts of silane coupling agent modified white carbon black, 4 parts of methyl silicone oil, 3 parts of 2,5-dimethyl-2,5-bishexane, and 0.2 parts of zinc stearate.

[0072] Among them, the methyl vinyl silicone rubber is modified methyl vinyl silicone rubber, which is obtained by blending methyl vinyl silicone rubber with ethylene propylene diene rubber and iron oxide. The addition amount of ethylene propylene diene rubber is 30wt% of the methyl vinyl silicone rubber, and the addition amount of iron oxide is 5wt% of the methyl vinyl silicone rubber. The relative molecular weight of the methyl vinyl silicone rubber used is 450,000 to 500,000, and the vinyl content is 1.8wt%.

[0073] The preparation method of silane coupling agent modified white carbon black includes: 1) dissolving the silane coupling agent in 98 vol% ethanol solvent, standing for 4 hours, and obtaining a silane coupling agent solution; 2) adding white carbon black to the silane coupling agent solution, and ultrasonically dispersing the solution; 3) heating and volatilizing the solvent under continuous stirring, and obtaining silane coupling agent modified white carbon black after drying, wherein the amount of the silane coupling agent is 15 wt% of the white carbon black, the white carbon black is gas phase white carbon black, the particle size of the white carbon black is 10-20 nm, and the silane coupling agent is bis(γ-triethoxysilylpropyl)tetrasulfide.

[0074] After the preparation of the silane coupling agent modified silica is completed, a post-treatment step is also included, in which the silane coupling agent is pre-mixed in methyl vinyl silicone rubber, and the amount of methyl vinyl silicone rubber is 7 times the mass of the modified silica, specifically including: 1) adding the methyl vinyl silicone rubber into a vacuum kneader and kneading for 5 minutes; 2) adding the modified silica into the vacuum kneader in 4 times, kneading for 15 minutes each time; 3) taking it out after the treatment is completed to obtain the post-treated modified silica.

[0075] The preparation method of the silicone spring comprises the following steps: 1) Clean and dry the independent spring; 2) Mixing modified methyl vinyl silicone rubber, polyvinyl alcohol, pre-treated silane coupling agent modified white carbon black, methyl silicone oil, 2,5-dimethyl-2,5-bishexane and zinc stearate to obtain a raw material to be processed; 3) After the raw material to be processed is made into the shape of an inner cylinder, an independent spring is sleeved on the outside of the inner cylinder, and then the material to be processed is covered on the outside of the inner cylinder to form an outer cylinder; 4) The silicone spring is obtained after vulcanization treatment, the vulcanization temperature is 120°C, and the vulcanization time is 20 min.

[0076] Silicone Spring #4 The difference from Silicone Spring #1 is that the methyl vinyl silicone rubber is unmodified methyl vinyl silicone rubber.

[0077] Silicone Spring #5 The difference from Silicone Spring #1 is that only EPDM rubber is added to the preparation method of the modified methyl vinyl silicone rubber.

[0078] Silicone spring #6 The difference from Silicone Spring #1 is that only iron oxide is added to the preparation method of the modified methyl vinyl silicone rubber.

[0079] Silicone Spring #7 The difference from silicone spring #1 is that the relative molecular weight of methyl vinyl silicone rubber is 650,000 to 700,000.

[0080] Silicone spring #8 The difference from Silicone Spring #1 is that the vinyl content of methyl vinyl silicone rubber is 4.5wt%.

[0081] Silicone spring #9 The difference from Silicone Spring #1 is that the vinyl content of methyl vinyl silicone rubber is 0.5wt%.

[0082] Silicone spring #10 The difference from Silicone Spring #1 is that the silica is unmodified silica.

[0083] Silicone spring #11 The difference from silicone spring #1 is that the amount of silane coupling agent used is 3wt% of white carbon black.

[0084] Silicone spring #12 The difference from silicone spring #1 is that the particle size of silica is 40~60nm.

[0085] Silicone spring #12 The difference from Silicone Spring #1 is that the amount of methyl vinyl silicone rubber used in the premix is ​​3 times the mass of modified silica.

[0086] Test Example 1 Silicone Spring Performance Test Results The silicone springs #1~#12 prepared above were subjected to the following performance tests.

[0087] Bending resistance times: The silicone spring is tested for its bending resistance at room temperature, and is compressed to 75% of its original length each time during the test.

[0088] Fall-off resistance: Test the initial weight of the silicone spring, then compress and reset it repeatedly. After testing 100,000 times, weigh the weight of the silicone spring after treatment. The difference between 1-the ratio of the weight after treatment to the initial weight is the fall-off rate (%).

[0089] Support performance: Referring to the method recorded in GB / T7759-2015 standard, the support performance of the silicone spring is tested by testing the compression permanent deformation of the silicone spring. The test is carried out at a temperature of 75°C, with the compression rate of the silicone spring being 75%. After maintaining it for 100 days, the compression permanent deformation rate (%) of the test silicone spring is measured and calculated.

[0090] Rebound performance: refer to GB / T1681 determination method of vulcanized rubber rebound resilience, place the silicone spring at the bottom of the rebound tester, place the measuring iron rod at the 100 scale position, let it fall naturally, read the rebound height of the iron rod (1kg), and calculate the rebound resilience (%) after multiple experiments.

[0091] The test results are shown in Table 1. In Table 1, the higher the crack level after 100,000 flexures, the more serious the cracks and the worse the flexural resistance; the higher the shedding rate, the worse the shedding resistance; the higher the compression permanent deformation rate, the worse the supporting performance; the higher the resilience, the better the resilience.

[0092] Table 1 Silicone spring performance test results

[0093] According to the results in Table 1, the silicone springs #1, #2 and #3 in the present application have good bending resistance, falling resistance, support performance and resilience. The silicone springs prepared by modifying methyl vinyl silicone rubber, specifically blending ethylene propylene rubber and iron oxide, and selecting methyl vinyl silicone rubber with a specific molecular weight and vinyl content have good bending resistance, falling resistance, support performance and resilience.

[0094] By selecting silica with specific properties and modifying the silica with a silane coupling agent, the dispersion performance of silica can be improved. Before the silica is added, it is premixed in methyl vinyl silicone rubber as a masterbatch, and then in a subsequent step, the masterbatch is mixed with other raw materials to prepare the materials of the inner and outer tubes of the silicone spring. This can significantly improve the flexural resistance, fall-off resistance, support performance and rebound performance of the silicone spring.

[0095] 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 for a mattress, characterized in that: The silicone spring comprises an independent spring and a silicone material coated on the outside of the independent spring, and the silicone material comprises, by weight: 100 parts of methyl vinyl silicone rubber, 8-12 parts of polyvinyl alcohol, 10-15 parts of silane coupling agent modified white carbon black, 2-4 parts of methyl silicone oil, 1-3 parts of 2,5-dimethyl-2,5-bishexane, and 0.1-0.2 parts of zinc stearate.

2. The silicone spring for a mattress according to claim 1, characterized in that: The methyl vinyl silicone rubber is modified methyl vinyl silicone rubber. The preparation method of the modified methyl vinyl silicone rubber includes the step of blending the methyl vinyl silicone rubber with ethylene propylene diene monomer rubber and iron oxide. The addition amount of the ethylene propylene diene monomer rubber is 10-30wt% of the methyl vinyl silicone rubber, and the addition amount of the iron oxide is 1-5wt% of the methyl vinyl silicone rubber.

3. The silicone spring for a mattress according to claim 2, characterized in that: The relative molecular weight of the methyl vinyl silicone rubber is 450,000 to 500,000, and the vinyl content is 1.8 to 3 wt %.

4. The silicone spring for a mattress according to claim 1, characterized in that: The preparation method of the silane coupling agent modified white carbon black comprises: 1) Dissolve the silane coupling agent in 95-98 vol% ethanol solvent and let stand for 2-4 hours to obtain a silane coupling agent solution; 2) Add white carbon black to the silane coupling agent solution and perform ultrasonic dispersion treatment; 3) heating to volatilize the solvent under continuous stirring, and obtaining the silane coupling agent-modified white carbon black after drying.

5. The silicone spring for a mattress according to claim 4, characterized in that: The amount of the silane coupling agent used is 5-15wt% of the white carbon black.

6. The silicone spring for a mattress according to claim 4, characterized in that: The white carbon black is fumed white carbon black, and the particle size of the white carbon black is 10-20 nm.

7. The silicone spring for a mattress according to claim 4, characterized in that: After the silane coupling agent modified white carbon black is prepared, a post-treatment step of premixing it in methyl vinyl silicone rubber is included, and the amount of methyl vinyl silicone rubber in the premix is ​​not less than 5 times the mass of the modified white carbon black.

8. The silicone spring for a mattress according to claim 7, characterized in that: The post-processing steps include: 1) Add methyl vinyl silicone rubber into a vacuum kneader and knead for 2 to 5 minutes; 2) Add the modified silica into the vacuum kneader at least three times, kneading for at least 10 minutes each time; 3) After the treatment is completed, take it out to obtain the modified silica after post-treatment.

9. The method for preparing a silicone spring for a mattress according to any one of claims 1 to 8, characterized in that: The preparation method comprises the following steps: 1) cleaning and drying the independent spring; 2) Mixing methyl vinyl silicone rubber, polyvinyl alcohol, silane coupling agent modified white carbon black, methyl silicone oil, 2,5-dimethyl-2,5-bishexane and zinc stearate to obtain a raw material to be processed; 3) After the raw material to be processed is prepared into an inner cylinder, an independent spring is sleeved on the outside of the inner cylinder, and then the material to be processed is wrapped around the outside of the inner cylinder to form an outer cylinder; 4) After vulcanization treatment, the silicone spring for the mattress is obtained.

10. Use of the silicone spring for mattresses according to any one of claims 1 to 8 in the preparation of spring mattresses.

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