Sucker material, preparation method thereof and self-suction type sucker and sucker type pad

Abstract

The application belongs to the technical field of suction cups and discloses a suction cup material, a preparation method thereof, a self-suction suction cup and a suction cup type pad, wherein the preparation raw material of the suction cup material comprises SEBS, EVA, processing oil, polypropylene, SEBS-g-MAH, an antioxidant and a lubricant. The application introduces SEBS into the formula system of the suction cup material, endows the suction cup material with excellent elasticity, soft touch and rebound performance, makes the formed suction cup lip edge easy to deform, and enables the air in the suction cup cavity to be discharged to form a negative pressure by light pressing, thereby solving the defect that the traditional hard suction cup needs to be pressed hard. The formula system is introduced with the EVA material, the cost of the raw material is further reduced, the hardness of the suction cup material can be adjusted, the suction cup material will not be excessively soft and will not have the problem of insufficient support, thereby helping to prolong the negative pressure maintaining time and relieve the problem that the anti-skid and adsorption performance of the suction cup type anti-skid pad rapidly decays in the repeated use process.

Description

Technical Field

[0001] This invention relates to the field of suction cup technology, and in particular to a suction cup material and its preparation method, as well as a self-suctioning suction cup and a suction cup pad. Background Technology

[0002] Suction cup anti-slip mats are practical mats that provide adhesive-free fixation and slip protection. They consist of a mat body and suction cups at the bottom of the mat body. By expelling air from the suction cups, a negative pressure environment is created, allowing the mat body to adhere tightly to smooth surfaces such as glass and tiles. Simultaneously, the surface of the suction cup anti-slip mat is designed with anti-slip textures to further enhance friction and prevent objects from sliding or people from slipping. Based on these characteristics, suction cup anti-slip mats can be widely used in damp and slippery environments such as bathrooms and kitchens.

[0003] Existing suction cup anti-slip mats use suction cups made of relatively hard material, requiring significant pressure to ensure the mat adheres firmly to the installation area, making operation inconvenient. Furthermore, if the suction cups are not pressed firmly enough during installation, the lips cannot fully adhere to the substrate, making it difficult to expel air from the suction cup cavity and create a stable negative pressure. This results in insufficient adhesion, making the mat prone to shifting or even detaching under pressure from footsteps, water flow, or other external forces, significantly reducing its anti-slip effect. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a suction cup material and its preparation method, as well as a self-adhesive suction cup and a suction cup mat, in order to solve the problem that the suction cup material of the existing suction cup anti-slip mat is too hard, requiring a lot of pressure to make the mat firmly adhere to the laying area, which is inconvenient to operate and can easily cause safety hazards during the use of the anti-slip mat.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The first aspect of the present invention provides a suction cup material, the raw materials for which, by weight, are: SEBS: 68-72 parts, EVA: 28-32 parts, processing oil: 19-23 parts, polypropylene: 2-4 parts, SEBS-g-MAH: 2.5-3.2 parts, antioxidant: 0.2-0.4 parts, and lubricant: 0.1-0.3 parts.

[0006] In the suction cup material, the VA content of the EVA is 27-28%.

[0007] In the suction cup material, the polypropylene has a melt index of 10-15 g / 10 min.

[0008] In the suction cup material, the processing oil is at least one of naphthenic oil and white oil.

[0009] In the suction cup material, the lubricant is zinc stearate.

[0010] In the suction cup material, the antioxidant is antioxidant 1010.

[0011] A second aspect of the present invention provides a method for preparing the above-mentioned suction cup material, comprising the following steps: S10. Weigh SEBS, EVA, processing oil, polypropylene, SEBS-g-MAH, antioxidant, and lubricant according to the proportions and mix them in a mixer. S20. The mixed materials are placed in an extruder for melt blending, and then the melt is cooled and pelletized to obtain pellets. S30. Injection molding of granules to obtain suction cup material.

[0012] In the method for preparing the suction cup material, the mixing temperature in step S10 is 60-80℃ and the mixing time is 5-8 min; in step S20, the extruder melting temperature is 160-185℃; in step S30, the injection molding temperature is 170-190℃ and the mold temperature is 40-60℃.

[0013] A third aspect of the present invention provides a self-closing suction cup, comprising the suction cup material described above. The thickness of the lip of the self-closing suction cup is 0.65–0.75 mm.

[0014] A fourth aspect of the present invention provides a suction cup type pad, including a pad and a self-adhesive suction cup disposed at the bottom of the pad; the self-adhesive suction cup is the self-adhesive suction cup described above.

[0015] Beneficial effects: The first aspect of this invention provides a suction cup material. By introducing SEBS into the formulation system of the suction cup material, the material can be endowed with excellent elasticity, soft touch, and resilience. This makes the lip of the molded suction cup easily deformable, allowing air to be expelled from the suction cup cavity and negative pressure to be formed with a light press. This solves the problem of traditional hard suction cups requiring strong pressing, making it convenient for users to use suction cup anti-slip mats while ensuring the anti-slip performance of the mats. Furthermore, by introducing EVA material into the formulation system, the cost of raw materials can be further reduced, and the hardness of the suction cup material can be adjusted, preventing the material from becoming too soft and lacking support. This helps to extend the negative pressure retention time and alleviate the problem of rapid decay of anti-slip and adsorption performance during repeated use of suction cup anti-slip mats.

[0016] The second aspect of this invention provides a method for preparing suction cup materials. The preparation method can be implemented and mass-produced using conventional mixing, extrusion, and injection molding equipment in a workshop. The equipment is highly versatile and has low investment costs. The entire process is highly controllable, has excellent production stability, and produces batches of finished products with good consistency, which is conducive to industrial-scale mass promotion. At the same time, by simply changing the injection molds of different specifications, suction cup products of various sizes and models can be processed, and the production line has a wide range of adaptability.

[0017] The third aspect of this invention provides a self-adhesive suction cup, which has a long-lasting adsorption force, is resistant to aging and does not easily detach. When assembled at the bottom of an anti-slip mat, it can quickly form a reliable negative pressure adsorption, which can effectively prevent the anti-slip mat from slipping or lifting its edges, so that the anti-slip mat can continuously guarantee its anti-slip performance. At the same time, the self-adhesive suction cup has good flexibility and resilience, and can be pre-fixed to various smooth surfaces without manual pressure, making it highly easy to use.

[0018] The fourth aspect of this invention provides a suction cup type mat, which can be adapted to various mat substrates. The self-adhesive suction cup at the bottom of the mat can quickly form negative pressure without the need for manual pressure to pre-fix it. When a person stands, sits, or lies on the mat, the air between the mat and the contact surface can be automatically expelled by the person's own weight, forming a stable, sealed negative pressure space without internal or external air circulation. Moreover, the greater the load applied by the person, the tighter the mat adheres, and the anti-slip performance is improved simultaneously. Attached Figure Description

[0019] Figure 1 This is a physical image of the self-suction suction cup provided by the present invention.

[0020] Figure 2 This is a flowchart illustrating the preparation process of the suction cup material of this invention.

[0021] Figure 3 This is a physical image of the suction cup pad provided by the present invention. Detailed Implementation

[0022] This invention provides a suction cup material, its preparation method, a self-adhesive suction cup, and a suction cup pad. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0023] The first aspect of this invention provides a suction cup material, which, after molding, can obtain... Figure 1 The self-priming suction cup.

[0024] Specifically, by weight, the raw materials for preparing the suction cup material include: SEBS: 68-72 parts, EVA: 28-32 parts, processing oil: 19-23 parts, polypropylene: 2-4 parts, SEBS-g-MAH: 2.5-3.2 parts, antioxidant: 0.2-0.4 parts, and lubricant: 0.1-0.3 parts.

[0025] In the raw materials used to prepare the aforementioned suction cup material, SEBS, a hydrogenated styrene-butadiene-styrene block copolymer, is the basic elastomer of the suction cup material. It provides the material with excellent elasticity, a soft touch, and resilience. The molded suction cup lip is easily deformable, and a light press can expel air from the suction cup cavity, creating negative pressure. This solves the problem of traditional rigid suction cups requiring strong pressure. Furthermore, SEBS imparts excellent resistance to compression creep, ensuring that negative pressure remains within the suction cup cavity for an extended period. EVA, or ethylene-vinyl acetate copolymer, can reduce the amount of SEBS in the raw material system, thereby lowering raw material costs. Furthermore, as a semi-crystalline polyolefin, EVA's crystalline regions provide a rigid support network. When blended with SEBS, it can increase the modulus of the suction cup material, mitigating the excessive softness and insufficient support often caused by the heavy use of SEBS. This prevents excessive collapse of the suction cup under pressure, reducing compression set and inhibiting plastic deformation under continuous load. Ultimately, it ensures smooth rebound after unloading, extending the negative pressure holding time and alleviating the problem of rapid decay in anti-slip and adsorption properties during repeated use of suction cup anti-slip mats.

[0026] Furthermore, in the raw materials for preparing the suction cup material described above, SEBS-g-MAH is maleic anhydride-grafted SEBS. One end of its molecular chain retains the SEBS chain segment structure, which is compatible with the SEBS matrix in the raw material system. The maleic anhydride group at the other end of its molecular chain can form hydrogen bonds and dipole interactions with the polar groups on the EVA molecular chain, improving the interfacial affinity of SEBS / EVA. When the suction cup is subjected to negative pressure compression load for a long time, the stress can be effectively transferred between the SEBS continuous phase and the EVA dispersed phase, avoiding slippage and delamination at the interface between the two phases. This significantly reduces the irreversible creep deformation of the polymer chain after compression, reduces the permanent compression deformation of the material, and prevents permanent collapse of the suction cup after long-term compression. As a result, it can maintain the tight adhesion between the suction cup and the adsorption substrate, effectively block air infiltration, and significantly improve the vacuum holding time and durable adsorption stability of the suction cup.

[0027] Polypropylene can be used to improve the melt processing performance of raw materials, increase melt strength, and avoid melt collapse and sticking to the mold during injection molding. At the same time, as a rigid phase dispersed in the SEBS elastic matrix, polypropylene can moderately increase the modulus of the suction cup material, suppress the continuous deformation of the suction cup material, thereby reducing the long-term compression creep of the suction cup material and extending the pressure holding time of the suction cup.

[0028] Processing oil can wet the elastic segments of SEBS, weaken the entanglement of SEBS molecular chains, reduce the hardness of the suction cup material, and make the suction cup lip softer, allowing it to adhere to a smooth surface with light pressure, thus improving ease of use. Furthermore, processing oil can improve melt viscosity, enhancing material processing performance and reducing energy consumption. Lubricant can reduce the friction between resin molecules, improve the uniformity of melt blending and dispersion, and reduce screw shear load. Additionally, lubricant can reduce friction between the melt and the barrel and mold cavity metal walls, ensuring smooth demolding during injection molding, thereby preventing suction cup lip tearing and sticking. Antioxidant can capture free radicals during high-temperature granulation and injection molding, preventing high-temperature breakage and degradation of SEBS and EVA molecular chains, avoiding decreased melt elasticity and yellowing of the product. Simultaneously, with long-term use, antioxidants can delay the natural aging of thermoplastic elastomers, preventing the suction cup from hardening and losing its springback, thus maintaining the long-term creep resistance of the suction cup.

[0029] As can be seen, by introducing SEBS into the suction cup material formulation, this invention endows the suction cup material with excellent elasticity, soft touch, and resilience. This makes the lip of the molded suction cup easily deformable, allowing air to be expelled from the suction cup cavity with a light press, creating negative pressure. This solves the problem of traditional hard suction cups requiring strong pressure, making it convenient for users to use suction cup anti-slip mats while ensuring their anti-slip performance. Furthermore, by introducing EVA material into the formulation, the cost of raw materials can be further reduced, and the hardness of the suction cup material can be adjusted, preventing the suction cup material from becoming excessively soft and lacking support. This helps to extend the negative pressure retention time and alleviate the problem of rapid decay of anti-slip and adsorption performance during repeated use of suction cup anti-slip mats.

[0030] In a preferred embodiment, the VA content of the EVA is 27-28%. When the VA content of EVA is within the range described above, the polarity of EVA is moderate, which can form a stable interface with the SEBS-g-MAH compatibilizer, improving the uniformity of the blending of SEBS and EVA. At the same time, EVA can retain a suitable degree of crystallinity, improving the overall rigidity of the suction cup material while maintaining its soft touch, and avoiding the increase in compression set caused by the large amount of SEBS used in the suction cup material.

[0031] In a preferred embodiment, the melt index of the polypropylene is 10-15 g / 10 min. When the melt index of polypropylene is within the above range, the polypropylene has a complete crystalline structure and moderate molecular chain entanglement strength, which can effectively improve the flexural modulus of the suction cup material, giving the suction cup appropriate stiffness. Under negative pressure, the suction cup is not prone to excessive deformation and collapse, and can maintain pressure and prevent air leakage for a long time.

[0032] In a preferred embodiment, the processing oil is at least one of naphthenic oil and white oil. Both naphthenic oil and white oil are low-aromatic mineral oils, and both have excellent compatibility with the soft segment of SEBS, effectively softening the elastomer and reducing the processing viscosity of the melt.

[0033] In a preferred embodiment, the lubricant is zinc stearate. Zinc stearate serves both internal and external lubrication purposes, reducing the viscosity of the melt, improving the uniformity of the blending and dispersion of SEBS and EVA, and simultaneously reducing friction between the injection melt and the mold cavity, thus enabling damage-free demolding by the suction cup.

[0034] In a preferred embodiment, the antioxidant is antioxidant 1010. Antioxidant 1010 is a high molecular weight tetrafunctional hindered phenolic antioxidant with excellent thermal stability and is not easily volatilized or decomposed at high temperatures; furthermore, its large molecular weight results in low migration risk, which can prevent aging problems in the suction cup material during long-term use.

[0035] like Figure 2 As shown, a second aspect of the present invention provides a method for preparing the above-mentioned suction cup material, comprising the following steps: S10. Weigh SEBS, EVA, processing oil, polypropylene, SEBS-g-MAH, antioxidant, and lubricant according to the proportions and mix them in a mixer. S20. The mixed materials are placed in an extruder for melt blending, and then the melt is cooled and pelletized to obtain pellets. S30. Injection molding of granules to obtain suction cup material.

[0036] The preparation method can be implemented on a large scale using conventional mixing, extrusion, and injection molding equipment in the workshop. The equipment is highly versatile and has low investment costs. The whole process is highly controllable, has excellent production stability, and good batch consistency of finished products, which is conducive to industrial mass promotion. At the same time, only by changing the injection mold of different specifications, suction cup products of various sizes and models can be processed, and the production line has a wide range of adaptability.

[0037] In order to ensure that the liquid processing oil fully wets the SEBS and EVA particles, and that the powdered antioxidants and lubricants can be uniformly attached to the resin surface, thus achieving pre-dispersion of solid materials; at the same time, to avoid problems such as agglomeration of additives and uneven oil filling in the subsequent melt blending stage, and to ensure that the composition of each batch of materials is uniform from the source, thereby reducing fluctuations in the hardness and adsorption performance of the finished product, in step S10, the mixing temperature is 60-80℃ and the mixing time is 5-8min.

[0038] In order to ensure that the resin and additives are fully melted and blended, and to avoid high-temperature thermal degradation of SEBS and EVA, the extruder melt temperature in step S20 is 160-185°C.

[0039] In order to ensure that the melt has good fluidity and filling capacity, and can completely fill the mold cavity, while ensuring that the product cools evenly and demolds smoothly, in step S30, the injection molding temperature is 170-190℃ and the mold temperature is 40-60℃.

[0040] A third aspect of this invention provides a self-adhesive suction cup, comprising the suction cup material described above. The thickness of the lip of the self-adhesive suction cup is 0.65–0.75 mm, with suitable softness and hardness. The self-adhesive suction cup has long-lasting adsorption force, is resistant to aging and does not easily detach. When assembled at the bottom of an anti-slip mat, it can quickly form a reliable negative pressure adsorption, effectively preventing the anti-slip mat from slipping or lifting, thus ensuring the anti-slip mat can continuously maintain its anti-slip effect. At the same time, the self-adhesive suction cup also has good flexibility and resilience, and can be pre-fixed to various smooth surfaces without the need for strong manual pressing, making it highly easy to use.

[0041] A fourth aspect of the present invention provides a suction cup type pad, comprising a pad body and a self-adhesive suction cup disposed at the bottom of the pad body; the self-adhesive suction cup is the self-adhesive suction cup described above. The pad body may be made of TPE material, EVA material, PVC material, etc.

[0042] The suction cup-type mat can be adapted to various mat substrates. It can quickly form negative pressure by relying on the self-suction cup at the bottom of the mat, without the need for manual pressure to pre-fix it. When a person stands, sits, or lies on the mat, the air between the mat and the contact surface can be automatically expelled by the person's own weight, forming a stable, sealed negative pressure space without internal or external air circulation. Moreover, the greater the load applied by the person, the tighter the mat adheres, and the anti-slip performance is improved simultaneously.

[0043] The following examples and comparative examples further illustrate the present invention. The sources of some of the raw materials used in the following examples and comparative examples are as follows: SEBS: Baling Petrochemical YH-501; EVA: Lianhong UL00628, VA content 27.5%, melt index 5.5g / 10min; EVA: Lianhong UL01833, VA content 33%, melt index 18g / 10min; Polypropylene: Yangzi Petrochemical YPJ-1215C, melt index 15g / 10min; Polypropylene: Thai Petrochemical 2300SC, melt flow index 30g / 10min; SEBS-g-MAH: KETEN FG1901X.

[0044] Example 1 This embodiment provides a suction cup material, the raw materials for which, by weight, are: SEBS (Baling Petrochemical YH-501): 70 parts, EVA (Lianhong UL00628): 30 parts, naphthenic oil: 21 parts, polypropylene (Yangzi Petrochemical YPJ-1215C): 3 parts, SEBS-g-MAH (Keteng FG1901X): 3.0 parts, antioxidant 1010: 0.3 parts, zinc stearate: 0.2 parts.

[0045] This embodiment also provides a method for preparing a suction cup material, including the following steps: S10. Weigh SEBS, EVA, processing oil, polypropylene, SEBS-g-MAH, antioxidant, and lubricant according to the proportions and mix them in a mixer. S20. The mixed materials are placed in an extruder for melt blending, and then the melt is cooled and pelletized to obtain pellets. S30. Injection molding of granules to obtain suction cup material.

[0046] Furthermore, in step S10, the mixing temperature is 70℃ and the mixing time is 6 minutes; in step S20, the temperatures of each barrel of the extruder are set sequentially to 160℃, 165℃, 170℃, 175℃, 180℃, and 182℃; in the injection molding process of step S30, the temperature of the feeding section is 170℃, the temperature of the front section is 175℃, the temperature of the middle section is 180℃, the temperature of the rear section is 190℃, and the mold temperature is 50℃.

[0047] Example 2 This embodiment provides a suction cup material, the raw materials for which, by weight, are: SEBS (Baling Petrochemical YH-501): 68 parts, EVA (Lianhong UL00628): 28 parts, naphthenic oil: 19 parts, polypropylene (Yangzi Petrochemical YPJ-1215C): 2 parts, SEBS-g-MAH (Keteng FG1901X): 2.5 parts, antioxidant 1010: 0.2 parts, zinc stearate: 0.1 parts.

[0048] This embodiment also provides a method for preparing a suction cup material, including the following steps: S10. Weigh SEBS, EVA, processing oil, polypropylene, SEBS-g-MAH, antioxidant, and lubricant according to the proportions and mix them in a mixer. S20. The mixed materials are placed in an extruder for melt blending, and then the melt is cooled and pelletized to obtain pellets. S30. Injection molding of granules to obtain suction cup material.

[0049] Furthermore, in step S10, the mixing temperature is 60℃ and the mixing time is 5min; in step S20, the temperatures of each barrel of the extruder are set sequentially to 160℃, 165℃, 170℃, 175℃, 180℃, and 182℃; in the injection molding process of step S30, the temperature of the feeding section is 170℃, the temperature of the front section is 175℃, the temperature of the middle section is 180℃, the temperature of the rear section is 190℃, and the mold temperature is 40℃.

[0050] Example 3 This embodiment provides a suction cup material, the raw materials for which, by weight, are: SEBS (Baling Petrochemical YH-501): 72 parts, EVA (Lianhong UL00628): 32 parts, naphthenic oil: 23 parts, polypropylene (Yangzi Petrochemical YPJ-1215C): 4 parts, SEBS-g-MAH (Keteng FG1901X): 3.2 parts, antioxidant 1010: 0.4 parts, zinc stearate: 0.3 parts.

[0051] This embodiment also provides a method for preparing a suction cup material, including the following steps: S10. Weigh SEBS, EVA, processing oil, polypropylene, SEBS-g-MAH, antioxidant, and lubricant according to the proportions and mix them in a mixer. S20. The mixed materials are placed in an extruder for melt blending, and then the melt is cooled and pelletized to obtain pellets. S30. Injection molding of granules to obtain suction cup material.

[0052] Furthermore, in step S10, the mixing temperature is 80℃ and the mixing time is 8min; in step S20, the temperatures of each barrel of the extruder are set sequentially to 160℃, 165℃, 170℃, 175℃, 180℃, and 182℃; in the injection molding process of step S30, the temperature of the feeding section is 170℃, the temperature of the front section is 175℃, the temperature of the middle section is 180℃, the temperature of the rear section is 190℃, and the mold temperature is 60℃.

[0053] Comparative Example 1 This comparative example provides a suction cup material, the raw materials for which, by weight, are: SEBS (Baling Petrochemical YH-501): 55 parts, EVA (Lianhong UL00628): 45 parts, naphthenic oil: 21 parts, polypropylene (Yangzi Petrochemical YPJ-1215C): 3 parts, SEBS-g-MAH (Keteng FG1901X): 3.0 parts, antioxidant 1010: 0.3 parts, zinc stearate: 0.2 parts.

[0054] This comparative example also provides a method for preparing the suction cup material of this comparative example, which is the same as the preparation method provided in Example 1.

[0055] Comparative Example 2 This comparative example provides a suction cup material, the raw materials for which, by weight, are: SEBS (Baling Petrochemical YH-501): 90 parts, EVA (Lianhong UL00628): 10 parts, naphthenic oil: 21 parts, polypropylene (Yangzi Petrochemical YPJ-1215C): 3 parts, SEBS-g-MAH (Keteng FG1901X): 3.0 parts, antioxidant 1010: 0.3 parts, zinc stearate: 0.2 parts.

[0056] This comparative example also provides a method for preparing the suction cup material of this comparative example, which is the same as the preparation method provided in Example 1.

[0057] Comparative Example 3 This comparative example provides a suction cup material. The only difference between this material and the material provided in Example 1 is that the EVA used has a VA content of 33%.

[0058] This comparative example also provides a method for preparing the suction cup material of this comparative example, which is the same as the preparation method provided in Example 1.

[0059] Comparative Example 4 This comparative example provides a suction cup material. The only difference between the raw material and the raw material provided in Example 1 is that the polypropylene used is polypropylene with a melt index of 30 g / 10 min.

[0060] This comparative example also provides a method for preparing the suction cup material of this comparative example, which is the same as the preparation method provided in Example 1.

[0061] Comparative Example 5 This comparative example provides a suction cup material, which differs from the material provided in Example 1 only in that it does not use SEBS-g-MAH.

[0062] This comparative example also provides a method for preparing the suction cup material of this comparative example, which is the same as the preparation method provided in Example 1.

[0063] The suction cup materials provided in the above embodiments and comparative examples were tested, and the compression set C (%) and hardness of the suction cup materials were tested respectively.

[0064] Compression set, or compression set, reflects the ability of a suction cup material to return to its original dimensions after pressure is released. A higher compression set value indicates that the suction cup material is more prone to irreversible deformation under pressure, while a lower compression set value indicates stronger rebound ability, making it less likely to permanently collapse under repeated pressure and resulting in better dimensional stability of the suction cup structure. Therefore, suction cup materials with low compression set are more suitable for producing self-closing suction cups. The compression set test is conducted according to the standard GB / T 7759.1-2005 "Determination of Compression Set of Vulcanized Rubber or Thermoplastic Rubber". The sample height is 12.5 mm, the diameter is 29 mm, and the sample compression rate during the test is 25%.

[0065] Hardness testing was conducted according to standard GB / T 39693.4-2025, "Determination of hardness of vulcanized or thermoplastic rubber – Part 4: Determination of indentation hardness by Shore hardness tester (Shore hardness)". The sample thickness was 6 mm. The test results are shown in the table below.

[0066]

[0067] As can be seen from the test results in the table above, the permanent compression deformation of the suction cup materials provided in Examples 1 to 3 is maintained at 26-30%, and the hardness is moderate. This ensures that the suction cup is soft and easily deformable, and can expel the internal air and form negative pressure with a light press, making operation effortless. At the same time, it has sufficient supporting rigidity and will not collapse under pressure due to the material being too soft.

[0068] The compression set and hardness test results of the suction cup material provided in Comparative Example 1 were significantly higher than those in Example 1. This is because the amount of EVA used in the preparation of the suction cup material in Comparative Example 1 was greatly increased. EVA is a semi-crystalline polyolefin, and a high proportion of EVA significantly increases the density of the internal crystalline network, resulting in an increase in the overall modulus and hardness of the material. Furthermore, the excessive EVA crystalline regions restrict the recovery of the internal molecular chains, thus leading to a significant increase in the irreversible plastic deformation of the suction cup material under pressure.

[0069] The compression set test results of the suction cup material provided in Comparative Example 2 were higher than those in Example 1, while the hardness test results were lower than those in Example 1. This is because the proportion of SEBS in the raw materials for preparing the suction cup material in Comparative Example 2 was significantly increased, resulting in the suction cup material being too soft.

[0070] The compression set test results of the suction cup material provided in Comparative Example 3 were slightly higher than those in Example 1. This is because Comparative Example 3 used EVA with a higher VA (vinyl acetate) content. The higher the VA content of EVA, the lower the crystallinity, which will lead to a simultaneous decrease in the rigidity and modulus of the suction cup material, making the suction cup material more prone to collapse under pressure.

[0071] The compression set test results of the suction cup material provided in Comparative Example 4 were slightly higher than those in Example 1. This is because Comparative Example 4 used polypropylene with a higher melt index. However, the molecular chain strength of polypropylene with a higher melt index is insufficient, which will cause the rigidity and modulus of the suction cup material to decrease simultaneously, making the suction cup material more prone to collapse under pressure.

[0072] The compression set test results of the suction cup material provided in Comparative Example 5 were slightly higher than those in Example 1. This is because SEBS-g-MAH was not used in the raw materials of the suction cup material in Comparative Example 5, which resulted in poor compatibility between the SEBS and EVA phases in the suction cup material. The stress could not be effectively transferred between the continuous SEBS phase and the dispersed EVA phase, resulting in poor overall rebound consistency of the suction cup material. After being compressed, the suction cup material would experience local permanent collapse.

[0073] It is understood that those skilled in the art can make equivalent substitutions or modifications to the technical solution and inventive concept of the present invention, and all such substitutions or modifications should fall within the protection scope of the appended claims.

Claims

1. A suction cup material, characterized in that, The raw materials for its preparation, by weight, include: SEBS: 68-72 parts, EVA: 28-32 parts, processing oil: 19-23 parts, polypropylene: 2-4 parts, SEBS-g-MAH: 2.5-3.2 parts, antioxidant: 0.2-0.4 parts, and lubricant: 0.1-0.3 parts.

2. The suction cup material according to claim 1, characterized in that, The VA content of the EVA is 27-28%.

3. The suction cup material according to claim 1, characterized in that, The melt flow index of the polypropylene is 10-15 g / 10 min.

4. The suction cup material according to claim 1, characterized in that, The processing oil is at least one of naphthenic oil and white oil.

5. The suction cup material according to claim 1, characterized in that, The lubricant is zinc stearate.

6. The suction cup material according to claim 1, characterized in that, The antioxidant is antioxidant 1010.

7. A method for preparing a suction cup material as described in any one of claims 1-6, comprising the following steps: S10. Weigh SEBS, EVA, processing oil, polypropylene, SEBS-g-MAH, antioxidant, and lubricant according to the proportions and mix them in a mixer. S20. The mixed materials are placed in an extruder for melt blending, and then the melt is cooled and pelletized to obtain pellets. S30. Injection molding of granules to obtain suction cup material.

8. The method for preparing the suction cup material according to claim 7, characterized in that, In step S10, the mixing temperature is 60-80℃ and the mixing time is 5-8 min; in step S20, the extruder melt temperature is 160-185℃; in step S30, the injection molding temperature is 170-190℃ and the mold temperature is 40-60℃.

9. A self-suctioning suction cup, characterized in that, The suction cup material includes any one of claims 1-6; the thickness of the lip of the self-suction suction cup is 0.65-0.75 mm.

10. A suction cup type pad, characterized in that, It includes a pad and a self-suction cup disposed at the bottom of the pad; the self-suction cup is the self-suction cup as described in claim 9.

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