Anti-falling and anti-skid mobile phone shell and preparation method thereof

Abstract

The invention relates to the technical field of mobile phone accessories, and discloses an anti-falling and anti-skid mobile phone shell which comprises the following components in parts by weight: 60-75 parts of a silica gel base material; 10 to 20 parts of a functional additive; 4-6 parts of a temperature-sensitive polymer; 4-8 parts of a composite functional additive; the invention further provides a preparation method of the anti-falling and anti-skid mobile phone shell, and the preparation method comprises the following steps that the silica gel base material is pretreated, and water and impurities in the silica gel base material are removed; adding the functional additive into the silica gel base material and uniformly dispersing; adding the composite functional additive and uniformly fusing with the mixture; and fusing the temperature-sensitive polymer with the mixture. By optimizing the proportion of the functional additives, introducing the temperature-sensitive polymer and accurately controlling the injection molding process and curing treatment, the skid resistance, the falling resistance, the durability and the adaptability at different temperatures of the mobile phone shell are improved.

Description

Technical Field

[0001] The invention relates to the technical field of mobile phone accessories, in particular to a drop-resistant and non-slip mobile phone shell and a preparation method thereof. Background Art

[0002] With the popularity of smart phones, mobile phone cases, as an important accessory, are becoming more and more a must-have choice for consumers. Mobile phone cases can not only provide basic anti-fall protection, but also effectively enhance the personalization of the appearance of mobile phones.

[0003] In the prior art, materials such as silicone and TPU are often used in the production of mobile phone cases. Silicone materials are widely used in the market because they are soft, drop-resistant and have certain cushioning properties. However, while traditional silicone mobile phone cases improve their protective performance, they often ignore their anti-slip and adaptability. Although TPU materials provide better drop resistance, they lack the softness and comfort of silicone. The prior art focuses more on increasing friction through surface textures or particles to improve the anti-slip effect.

[0004] However, the prior art still has some shortcomings; first, although silicone has a cushioning effect, its anti-slip performance is still insufficient, especially in humid, high temperature or low temperature environments, the anti-slip property of the mobile phone case is significantly reduced, which can easily cause the mobile phone to slip; second, although traditional mobile phone case materials can resist falling to a certain extent, their durability and impact resistance are still insufficient, and they are prone to breakage or aging after long-term use; in addition, most current mobile phone cases have poor temperature adaptability, and friction and comfort are easily affected in extreme climates. More importantly, the inaccuracy of parameter control in the injection molding process makes the product surface quality inconsistent, affecting the overall performance of the mobile phone case. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a drop-resistant and non-slip mobile phone case and a preparation method thereof, which solves the problems in the prior art of poor slip resistance, insufficient drop resistance and unstable performance of mobile phone cases in extreme environments.

[0006] To achieve the above objectives, the present invention is implemented by the following technical scheme: a drop-resistant and non-slip mobile phone case, wherein the mobile phone case composition comprises the following components in parts by weight: Silicone base material: 60-75 parts. The molecular structure of silicone base material contains a large number of silicon-oxygen bonds, which enables it to undergo elastic deformation when subjected to external force and is not easy to break. In addition, silicone has a certain buffering effect, which helps to reduce the damage of the mobile phone when it is subjected to external impact; Functional additives: 10-20 parts; Thermosensitive polymer: 4-6 parts. Thermosensitive polymer has temperature response characteristics, that is, under low temperature conditions, the movement of its molecular chain is small and has strong rigidity; under high temperature conditions, the activity of its molecular chain is enhanced, so that the friction coefficient of the material is appropriately reduced to adapt to different use environments caused by temperature changes; Composite functional additives: 4 to 8 parts.

[0007] Preferably, the functional additives include: Nano-silicon dioxide: 4-8 parts, particle size is 10-100nm. Nano-silicon dioxide particles have a large specific surface area, which can effectively increase the interaction between the silicone base material and other functional components. This particle size range can form a fine and uniform microstructure in the material, further improving the performance of the material. Its tiny particles can form a microscopic rough structure on the surface of the silicone, thereby increasing the friction between the contact surfaces and improving the anti-slip performance. Graphene: 3-6 parts, particle size no larger than 5μm. Adding graphene to the material of the mobile phone case can effectively enhance the impact resistance and hardness of the mobile phone case. The excellent tensile strength of graphene can disperse external forces during falls and collisions, reducing damage caused by external impacts. This particle size range helps to ensure the mechanical properties of the mobile phone case while avoiding affecting its flexibility. Carbon nanotubes: 2 to 5 parts, particle size is 50 to 200 nm. Nanotubes have extremely high specific strength and specific stiffness, and their tensile strength along the long axis is extremely high, so they can effectively enhance the material's resistance to drop and cracking. When the mobile phone case is subjected to external impact, the carbon nanotubes can quickly absorb and disperse the impact force, reduce the propagation of cracks, and improve the impact resistance of the mobile phone case. This particle size range helps it form a strong three-dimensional network structure in the mobile phone case material.

[0008] Preferably, the composite functional additive comprises: Antioxidant: 1-3 parts. The function of antioxidant is to capture free radicals and inhibit the occurrence of oxidation reactions, thereby extending the service life of the material. At the same time, by adding antioxidants, these oxidation reactions can be effectively prevented, thereby maintaining the mechanical properties, flexibility and appearance of the mobile phone case; 1 to 3 parts of ultraviolet absorber, which can effectively absorb ultraviolet rays in sunlight and prevent ultraviolet rays from penetrating into the internal materials of the mobile phone case. At the same time, it can effectively reduce the incidence of ultraviolet rays and avoid aging and discoloration of materials caused by ultraviolet rays, thereby maintaining the appearance and performance of the mobile phone case; Plasticizer: 2 to 5 parts. Plasticizers are inserted between molecular chains to reduce the interaction between molecules, thereby reducing the hardness and glass transition temperature of the material, making the material softer and more elastic. At the same time, when subjected to external impact, plasticizers can cause the phone case to deform to a certain extent, thereby buffering the external force and reducing damage when falling.

[0009] The present invention also provides a method for preparing a drop-resistant and anti-slip mobile phone case, comprising the following steps: Pre-treat the silica gel base material to remove moisture and impurities. Through heating and vacuum degassing, moisture and impurities in the silica gel base material are removed, thereby ensuring the uniformity and operability of the material and avoiding the influence of adverse reactions on the material performance; Add the functional additives into the silica base and disperse them evenly; Add composite functional additives and blend them evenly with the mixture; blending a temperature-sensitive polymer with the mixture; Perform injection molding to form the shape of the mobile phone case; Curing the injection molded mobile phone shell; The cured mobile phone case is post-processed to remove excess parts and perform surface finishing. The cured mobile phone case needs to be deburred and surface finished to ensure its smooth and defect-free appearance. The deburring and surface finishing process can remove the irregular edges during the injection molding process to ensure that the appearance of the final product meets the standards. In addition, surface finishing can improve the touch of the mobile phone case, making it smoother and more comfortable, and avoid affecting the user experience due to rough surfaces or burrs. Through this post-processing, the appearance and quality of the mobile phone case are ultimately guaranteed.

[0010] Preferably, the pretreated silica gel base material comprises: Place the silicone base material in a heating furnace for heating, and control the temperature at 80℃~100℃. This temperature range can ensure that the silicone base material can fully remove the moisture in it, improve the pretreatment efficiency, and provide a more stable base material for the subsequent mixing steps; continue heating for 30 minutes to 1 hour. This heating time range can ensure that the moisture in the silicone base material is fully evaporated at a moderate temperature. If the heating time is too short and the moisture is not completely removed, it may cause uneven materials in the subsequent mixing process and affect the final quality of the mobile phone case. On the contrary, if the heating time is too long, although it is conducive to removing moisture, it may cause changes in the physical properties of the silicone base material and reduce its performance; Use vacuum degassing equipment to remove bubbles and impurities in the silicone base material to ensure uniformity during the mixing process. By using vacuum degassing equipment, bubbles and impurities in the silicone base material can be effectively removed by reducing the ambient pressure to ensure the uniformity of the base material, thereby improving the stability of subsequent processes and the quality of the final product.

[0011] Preferably, the step of adding the functional additives into the silica gel base material and uniformly dispersing the functional additives comprises: Adding nano-silica, graphene and carbon nanotubes together with toluene or xylene, the particles of functional additives such as nano-silica, graphene and carbon nanotubes are relatively fine and have strong affinity, which makes it difficult to disperse them in the silica base material. The solvent can fully dissolve or suspend the additives, reduce particle agglomeration, ensure that the subsequent mixing can achieve the expected dispersion effect, and further improve the comprehensive performance of the mobile phone case; Use a high shear mixer for mixing, with a dispersion time of 1 to 2 hours. Mixing within this time range can maximize the uniform distribution of the additives, so that the phone case has the same performance in all areas; The dispersion temperature is controlled at 25℃~40℃ to ensure the uniform distribution of functional additives. This temperature range can ensure that the additives in the solvent remain stable without solubility changes or aggregation. This temperature range ensures the uniform dispersion of functional additives in the base material while avoiding any negative effects caused by excessively high temperatures, thereby maintaining the excellent performance of the mobile phone case.

[0012] Preferably, the adding of the composite functional additive and uniformly blending it with the mixture comprises: Antioxidants, UV absorbers and plasticizers are added to the mixture. The antioxidant can effectively inhibit the oxidation reaction and extend the service life of the mobile phone case, while the UV absorber can absorb UV rays and convert them into heat energy, reducing the damage of UV rays to the mobile phone case, thereby improving the anti-UV ability of the mobile phone case and maintaining its appearance and performance stability in long-term use. At the same time, the addition of plasticizers allows the mobile phone case to maintain a certain degree of softness in a low temperature environment, avoid becoming brittle or cracking, and improve the comfort of touch. During the stirring process, the stirring temperature is controlled to be 100°C to 120°C. This temperature range can ensure the stability and effect of functional additives such as plasticizers, antioxidants and ultraviolet absorbers, thereby improving the overall performance of the mobile phone case; The stirring speed is set to 200rpm~500rpm, and stirring is continued for 30 minutes to 1 hour to ensure uniform fusion. Through this range of stirring speed and stirring time, the uniform distribution of the composite functional additives in the silicone base material can be guaranteed, ensuring the consistent performance of the mobile phone case in each area and avoiding excessive shearing of the material, thereby ensuring the excellent anti-fall and anti-slip properties of the mobile phone case.

[0013] Preferably, the step of fusing the temperature-sensitive polymer with the mixture comprises: Adding a thermosensitive polymer (such as polyurethane elastomer) to the mixture, polyurethane elastomer has a higher friction coefficient at low temperatures, which can enhance the anti-slip property of the mobile phone case, while at high temperatures, its friction coefficient is lower, which can keep the surface of the mobile phone case smooth and avoid the loss of comfort caused by excessive friction; During the stirring process, the temperature is maintained at 100℃~120℃. This temperature range can ensure that the polymer does not degrade when mixed with other ingredients, while maintaining the fluidity of its molecular chain, thereby ensuring its uniform distribution. Too low a temperature may lead to incomplete dissolution of the polymer, affecting its adaptive performance; too high a temperature may cause the polymer to degrade, affecting its mechanical properties and long-term stability; The stirring time is 1 to 2 hours to ensure that the thermosensitive polymer is completely dissolved and evenly blended with other ingredients. If the stirring time is insufficient, the thermosensitive polymer may not be completely blended with other components, resulting in performance differences in different parts of the mobile phone case; if the stirring time is too long, the polymer's molecular chain may be excessively sheared, affecting the mechanical properties and durability of the material. Therefore, this range of stirring time can ensure the complete dissolution and uniform distribution of the polymer, ensuring that the mobile phone case maintains ideal performance under a variety of environmental conditions.

[0014] Preferably, the injection molding comprises: The mixture is fed into the barrel of the injection molding machine, and the injection temperature is set to 150℃~180℃. This temperature range can ensure that the mixture is completely melted and has appropriate fluidity, so that it can evenly fill the mold while avoiding the loss of material properties at too high a temperature. In addition, a higher injection temperature helps promote the uniform fusion of different ingredients and ensure the consistency of functional additives and polymers in the final product; The injection pressure is controlled between 60MPa and 120MPa. This injection pressure range can ensure that the material flows smoothly into the mold while avoiding the adverse effects of excessive pressure, thus ensuring the physical properties and appearance quality of the mobile phone case. The injection speed was set to 50 cm 3 / min~150cm 3 / min, ensuring that the material fills the mold evenly. This injection speed range can ensure that the material flows into the mold at a uniform and stable speed, thereby avoiding the above problems and ensuring the molding quality of the mobile phone case, especially the precise filling of the details, ensuring the dimensional accuracy and performance consistency of each product.

[0015] Preferably, the curing process comprises: The injection molded mobile phone case is placed in a curing oven, and the curing temperature is controlled at 150℃~180℃. This temperature range can ensure that the polymer undergoes a moderate cross-linking reaction, while avoiding material degradation or performance degradation caused by overheating. At the same time, it can provide sufficient energy to promote the cross-linking reaction, thereby making the molecular structure of the mobile phone case more compact and stable, and improving its impact resistance and durability; The curing time is set to 30 minutes to 60 minutes to ensure that the mobile phone shell reaches the required mechanical properties. This curing time range can ensure that the cross-linking reaction is fully carried out and the performance of the mobile phone shell is stable; Peroxides are used in the curing process to promote cross-linking reactions and improve drop resistance. Peroxide initiators not only help improve the material's impact resistance, but also improve the material's chemical resistance and heat resistance, ensuring that the phone case maintains its physical properties and appearance in a variety of usage environments.

[0016] The present invention provides a drop-resistant and anti-skid mobile phone case and a preparation method thereof. The present invention has the following beneficial effects: 1. The present invention uses a combination of multiple functional additives, such as nano-silicon dioxide, graphene and carbon nanotubes, to significantly enhance the anti-skid performance and drop resistance of the mobile phone case. Through a reasonable proportion combination, not only the friction coefficient is increased, but also the grip stability of the mobile phone case in extreme environments such as humidity and cold is effectively improved. Compared with traditional silicone materials, this innovative solution solves the problem that ordinary silicone has poor anti-skid performance and insufficient drop resistance in high temperature or humid environments.

[0017] 2. The present invention introduces polyurethane elastomer, which enables the mobile phone case to automatically adjust the friction coefficient at different temperatures. This technical solution achieves the effect of increasing the friction coefficient at low temperatures and maintaining softness at high temperatures, effectively improving the grip experience under various climatic conditions. Compared with the materials in the prior art that do not have temperature adaptability, the present invention solves the problem of the decline in the anti-slip performance of traditional materials at extreme temperatures.

[0018] 3. The present invention ensures high precision and high consistency in the molding of the mobile phone case by precisely controlling the injection molding process parameters, such as temperature, pressure and injection speed. This technical solution effectively reduces problems such as incomplete mold filling and surface defects, and ensures the dimensional consistency and surface smoothness of each product. Compared with the situation of imprecise control of process parameters in traditional injection molding, the present invention improves the overall quality of the mobile phone case and reduces the scrap rate in the production process.

[0019] 4. The present invention optimizes the curing process and uses a peroxide initiator to promote the cross-linking reaction, thereby enhancing the drop resistance and durability of the mobile phone case. Compared with the materials with insufficient curing treatment in the prior art, the mobile phone case of the present invention performs better in terms of impact resistance and high temperature resistance, avoiding the problem of material embrittlement or insufficient hardness caused by insufficient cross-linking reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a flow chart of the method for preparing a mobile phone case. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Please refer to the attached Figure 1 : Embodiment 1: step: Pre-treat the silicone base material: Place the silicone base material in a heating furnace, set the temperature to 95°C, and heat for 45 minutes to ensure that the moisture is completely removed.

[0023] Add functional additives: Add nanosilica (6 parts), graphene (4 parts) and carbon nanotubes (3 parts) together with toluene solvent to the pretreated silica base. Use a high shear mixer to stir for 1 hour and control the temperature at 30°C to ensure that the functional additives are evenly distributed.

[0024] Adding composite functional additives: Add antioxidant (2 parts), UV absorber (1 part) and plasticizer (4 parts) to the mixture. Continue stirring, set the temperature at 110°C, and the stirring speed at 300 rpm for 45 minutes to ensure uniform fusion.

[0025] Adding the temperature-sensitive polymer: Add the polyurethane elastomer (5 parts) into the mixture, maintaining the stirring temperature at 115°C for 1 hour.

[0026] Injection molding: The mixture is fed into the injection molding machine, the injection temperature is 170°C, the injection pressure is 90MPa, and the injection speed is 80cm 3 / min, ensuring that the material fills the mold evenly and the molding accuracy is high.

[0027] Curing treatment: The injection molded mobile phone case is placed in a curing oven with a curing temperature of 160°C and a curing time of 45 minutes. Peroxide is used as a thermal curing initiator to promote the cross-linking reaction.

[0028] Post-processing: The cured phone case is passed through a deburring machine to remove excess material, and the surface is trimmed and inspected to ensure a smooth and flawless appearance.

[0029] Embodiment 2: step: Pre-treat the silica gel base material: put the silica gel base material into a heating furnace, set the temperature to 85°C, heat for 30 minutes to remove moisture.

[0030] Add functional additives: Add nano-silica (5 parts) and graphene (3 parts) to the silica base material in proportion, use a high shear mixer to mix, the dispersion time is 1.5 hours, and the temperature is maintained at 35°C to ensure uniform dispersion.

[0031] Add composite functional additives: add antioxidant (1.5 parts), ultraviolet absorber (1 part) and plasticizer (3.5 parts). Control the stirring temperature at 100°C and the stirring speed at 250rpm for 40 minutes to ensure that the additives are completely dissolved and evenly blended.

[0032] Addition of the temperature-sensitive polymer: Add polyurethane elastomer (4 parts) and stir, keep the temperature at 105°C, and stir for 1 hour to ensure that the temperature-sensitive polymer is completely dissolved.

[0033] Injection molding: Feed the mixture into the injection molding machine, set the injection temperature to 175°C, the injection pressure to 80MPa, and the injection speed to 100cm 3 / min, ensuring that every part of the mold is filled evenly.

[0034] Curing treatment: After injection molding, the mobile phone case is placed in a curing oven, the temperature is set to 165°C, the curing time is 40 minutes, and peroxide is used as an initiator to promote the cross-linking reaction.

[0035] Post-processing: After curing, the phone case is deburred and surface finished, and the surface smoothness and shape accuracy are checked.

[0036] Embodiment 3: step: Pre-treat the silica gel base material: put the silica gel base material into a heating furnace, set the temperature to 90°C, and heat for 1 hour to remove moisture and impurities.

[0037] Addition of functional additives: Add nano-silica (4 parts), graphene (4 parts) and carbon nanotubes (2 parts) in proportion to the treated silica gel base material, stir using a high shear mixer for 1 hour, and control the temperature at 30°C.

[0038] Addition of composite functional additives: Add antioxidant (2 parts), UV absorber (2 parts) and plasticizer (4 parts), set the stirring temperature to 110°C, stirring speed to 300 rpm, and continue stirring for 45 minutes to ensure uniform fusion.

[0039] Addition of temperature sensitive polymer: Polyurethane elastomer (6 parts) was added to the mixture, the temperature was maintained at 100°C, and the stirring time was 1.5 hours to ensure its uniform distribution.

[0040] Injection molding: The mixture was fed into the injection molding machine with an injection temperature of 180°C, an injection pressure of 100 MPa, and an injection speed of 70 cm 3 / min, ensuring that the material fills the mold evenly.

[0041] Curing treatment: The injection molded mobile phone case is placed in a curing oven with a curing temperature of 170°C and a curing time of 30 minutes. A peroxide initiator is used to promote the cross-linking reaction.

[0042] Post-processing: After curing, the phone case is deburred and surface finished to ensure that the appearance and quality meet the standards.

[0043] Embodiment 4: step: Pre-treat the silica gel base material: Place the silica gel base material in a heating furnace and heat it to 95°C for 40 minutes to remove moisture.

[0044] Addition of functional additives: Add nano-silica (5 parts), graphene (3 parts) and xylene, stir using a high shear mixer, disperse for 1 hour, and set the temperature to 28°C to ensure that the additives are evenly dispersed.

[0045] Addition of composite functional additives: antioxidant (2 parts), ultraviolet absorber (2 parts) and plasticizer (5 parts) were added, and the temperature was controlled at 115° C. and the stirring speed was 250 rpm during the stirring process for 50 minutes.

[0046] Add the temperature-sensitive polymer: add the polyurethane elastomer (5 parts), keep the temperature at 110°C, and stir for 1 hour.

[0047] Injection molding: The mixture was fed into the injection molding machine, and the injection temperature was set to 175°C, the injection pressure was 90MPa, and the injection speed was 120cm 3 / min, ensuring the mold is filled and avoiding defects.

[0048] Curing treatment: The injection molded mobile phone case is placed in a curing oven, the curing temperature is set to 165°C, the curing time is 40 minutes, and peroxide is used as an initiator.

[0049] Post-processing: deburring and surface finishing to ensure the surface of the phone case is smooth and flawless, and the final inspection is qualified.

[0050] Comparative Example 1: Reducing the proportion of functional additives (compared with Example 1) Differences: The proportion of functional additives: reduce nano-silica from 6 parts to 4 parts, graphene from 4 parts to 3 parts, and carbon nanotubes from 3 parts to 2 parts.

[0051] Operation process: Pre-treat the silicone base material: Place the silicone base material in a heating furnace, set the temperature to 95°C, and continue heating for 45 minutes to remove moisture.

[0052] Addition of functional additives: Nano-silica (4 parts), graphene (3 parts) and carbon nanotubes (2 parts) were added together with toluene solvent, stirred using a high shear mixer, the dispersion time was 1 hour, and the temperature was controlled at 30°C.

[0053] Adding composite functional additives: adding antioxidant (2 parts), ultraviolet absorber (1 part) and plasticizer (4 parts). The stirring temperature is set at 110°C and the stirring speed is 300 rpm for 45 minutes.

[0054] Adding temperature-sensitive polymer: Add polyurethane elastomer (5 parts), stir for 1 hour, and control the temperature at 105°C.

[0055] Injection molding: injection temperature 170℃, injection pressure 90MPa, injection speed 80cm 3 / min, ensuring uniform filling of the mold.

[0056] Curing treatment: curing temperature 160°C, curing time 45 minutes, using peroxide initiator to promote cross-linking reaction.

[0057] Post-processing: deburring, surface finishing, and final appearance inspection.

[0058] Comparative Example 2: No Thermosensitive Polymer Used (Compared with Example 2) Differences: Removal of temperature-sensitive polymers: Polyurethane elastomers are no longer added to examine their impact on the temperature adaptability and feel of the phone case.

[0059] Operation process: Pre-treat the silicone base material: put the silicone base material into a heating furnace, set the temperature to 90°C, and keep it for 30 minutes.

[0060] Add functional additives: Add nano-silica (5 parts), graphene (3 parts) and carbon nanotubes (2 parts) to the silica gel base material in proportion, stir using a high shear mixer, disperse for 1.5 hours, and set the temperature to 30°C.

[0061] Addition of composite functional additives: antioxidant (2 parts), ultraviolet absorber (2 parts) and plasticizer (4 parts) were added, stirring temperature was 100° C., stirring speed was 250 rpm, and the stirring was continued for 45 minutes.

[0062] Injection molding: injection temperature 175℃, injection pressure 80MPa, injection speed 90cm 3 / min, ensuring uniform filling of the mold.

[0063] Curing treatment: curing temperature 170℃, curing time 30 minutes, using peroxide initiator.

[0064] Post-processing: deburring and surface finishing to ensure that the phone case meets the appearance and physical performance standards.

[0065] Comparative Example 3: Using the traditional injection molding process, the injection speed is not precisely controlled (compared with Example 3) Differences: The injection speed is not precisely controlled: the injection speed is set to 100cm 3 / min, but not strictly controlled at 50cm 3 / min~150cm 3 / min range, but simply use the normal speed.

[0066] Operation process: Pre-treat the silicone base: Heat to 95°C for 45 minutes.

[0067] Adding functional additives: Mix nano-silicon dioxide (5 parts), graphene (3 parts), carbon nanotubes (2 parts) with the solvent and stir for 1 hour at a temperature of 30°C.

[0068] Adding composite functional additives: adding antioxidant (2 parts), ultraviolet absorber (2 parts) and plasticizer (5 parts), stirring at a temperature of 105° C. and a stirring speed of 300 rpm for 45 minutes.

[0069] Injection molding: injection temperature 175°C, injection pressure 100MPa, injection speed 100cm 3 / min.

[0070] Curing treatment: curing temperature 160℃, curing time 40 minutes, using peroxide initiator.

[0071] Post-processing: deburring and surface finishing to ensure forming accuracy.

[0072] Comparative Example 4: Reducing the curing time (compared with Example 4) Differences: Shortened curing time: Reduce curing time from 40 minutes to 20 minutes.

[0073] Operation process: Pre-treat the silicone base: Heat to 90°C for 40 minutes.

[0074] Add functional additives: add nano-silica (6 parts), graphene (3 parts), carbon nanotubes (3 parts), mix with the solvent, stir for 1 hour, and set the temperature to 30°C.

[0075] Addition of composite functional additives: antioxidant (1.5 parts), ultraviolet absorber (1 part), plasticizer (4 parts), stirring temperature is 100° C., stirring speed is 200 rpm, and the stirring time is continued for 30 minutes.

[0076] Injection molding: injection temperature 170℃, injection pressure 80MPa, injection speed 90cm 3 / min.

[0077] Curing treatment: Curing temperature 165℃, curing time 20 minutes, using peroxide initiator.

[0078] Post-processing: deburring and surface finishing.

[0079] experiment: Experimental purpose: To compare the performance differences of mobile phone cases of different technical solutions in the embodiment and the comparative example, especially the anti-slip, anti-fall and anti-ultraviolet ability.

[0080] Experimental steps: Sample preparation: Mobile phone case samples were prepared according to different formulas of the examples and comparative examples. The preparation process of each experimental group was strictly carried out according to the predetermined ratios and parameters.

[0081] Anti-slip test: Use a friction coefficient tester to test the friction coefficient of the phone case surface at room temperature (25°C) and high humidity environment (90% RH). Measure the static friction coefficient of each sample and record the data in dry, wet and low temperature environments. Test the friction coefficient change trend of each sample.

[0082] Drop resistance test: Free drop tests were conducted at heights of 1.5 meters and 2 meters. Each sample fell freely from a specified height to test the degree of damage and cracks of the sample after the fall. The overall integrity of the phone case was recorded, and the effects of different technical solutions on drop resistance were analyzed.

[0083] UV resistance test: Use a UV aging box to simulate long-term exposure to sunlight. Set the UV intensity to UV-A and continuously expose each sample for 200 hours. Detect and record the color change, cracks, and performance degradation of each sample.

[0084] Durability Test: Use a wear tester to wipe the surface of the phone case to simulate possible scratches in daily use. Set the number of wipes to 500 times and record the wear on the sample surface. Use a pressure tester on each sample to test its compression resistance and deformation under repeated compression.

[0085] Data Analysis: The test data of each experimental group was collected and compared and analyzed. The contribution of different technical solutions to performance was comprehensively evaluated by calculating the change in friction coefficient, the percentage of cracks and damage.

[0086] Experimental Materials: Silicone base material Nano-silicon dioxide, graphene, carbon nanotubes Polyurethane elastomer (temperature sensitive polymer) Antioxidants, UV absorbers, plasticizers Peroxide thermal curing initiator Toluene, xylene and other solvents Friction coefficient tester Drop test equipment UV aging box Wear testing machine, pressure testing machine Experimental process: Prepare samples: Prepare mobile phone case samples according to the parameters in different embodiments and comparative examples.

[0087] Conduct friction coefficient tests and record changes in friction under different environments.

[0088] Conduct a drop resistance test and record the damage after the fall.

[0089] The samples were placed in a UV aging box for UV exposure testing, and the color changes and cracks were recorded.

[0090] Durability testing was performed to observe surface wear and compression set.

[0091] Various data were collected and the performance differences between the embodiments and the comparative examples were analyzed and compared.

[0092] Experimental data comparison table From the experimental results, the innovation of the present invention is reflected in many aspects. First, the proportion of functional additives directly affects the anti-skid performance of the mobile phone case. In Example 1, the higher proportion of nano-silica, graphene and carbon nanotubes increases the friction coefficient, especially under wet conditions. In contrast, the friction coefficient of Comparative Example 1 is lower, indicating that the reduction in the proportion of functional additives leads to a decrease in anti-skid performance. In the mechanism analysis, nano-silica and graphene increase the surface roughness and strengthen the friction, so that the mobile phone case maintains good anti-skid performance under different environments.

[0093] Secondly, the addition of the temperature-sensitive polymer improves the temperature adaptability of the mobile phone case. Compared with Comparative Example 2, Example 2 shows better anti-slip performance in both low and high temperature environments. Mechanistically, the polyurethane elastomer can increase the friction coefficient at low temperatures and maintain good softness at high temperatures, avoiding the problem of the decline in anti-slip performance of traditional materials at extreme temperatures.

[0094] Precise control of injection molding process parameters is also one of the keys of the present invention. In Example 3, by precisely controlling the injection molding temperature, injection pressure and injection speed, the material is ensured to uniformly fill the mold, reducing voids and defects. In contrast, Comparative Example 3 did not precisely control the injection speed, resulting in incomplete material filling and defects, which made Example 3 better in drop resistance and surface quality.

[0095] Finally, the optimization of the curing process ensures the long-term durability of the mobile phone case. The curing time in Example 4 is controlled within the optimal range, ensuring that the cross-linking reaction of the material is complete, improving the drop resistance and wear resistance. The shortened curing time in Comparative Example 4 leads to incomplete cross-linking reaction, affecting the hardness and drop resistance of the final product.

[0096] The present invention improves the anti-slip, drop resistance, durability and UV resistance of the mobile phone case by optimizing the proportion of functional additives, adding temperature-sensitive polymers, accurately controlling the injection molding process and improving the curing process. The experimental data fully proves the excellent performance of the present invention under different process adjustments.

[0097] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drop-resistant and non-slip mobile phone case, characterized in that: The mobile phone shell composition comprises the following components in parts by weight: Silicone base material: 60-75 parts; Functional additives: 10-20 parts; Thermosensitive polymer: 4-6 parts; Composite functional additives: 4 to 8 parts.

2. The drop-resistant and non-slip mobile phone case according to claim 1, characterized in that: The functional additives include: Nano silicon dioxide: 4-8 parts, particle size 10-100nm; Graphene: 3-6 parts, particle size not greater than 5 μm; Carbon nanotubes: 2 to 5 parts, particle size 50 to 200 nm.

3. The drop-resistant and non-slip mobile phone case according to claim 1, characterized in that: The composite functional additives include: Antioxidant: 1-3 parts; 1 to 3 parts of ultraviolet absorber; Plasticizer: 2 to 5 parts.

4. A method for preparing a drop-resistant and non-slip mobile phone case, characterized in that: Using the anti-drop and anti-slip mobile phone case according to any one of claims 1 to 3 comprises the following steps: Pre-treat the silica gel base material to remove moisture and impurities; Add the functional additives into the silica base and disperse them evenly; Add composite functional additives and blend them evenly with the mixture; blending a temperature-sensitive polymer with the mixture; Perform injection molding to form the shape of the mobile phone case; Curing the injection molded mobile phone shell; The cured mobile phone case is post-processed to remove excess parts and perform surface finishing.

5. The method for preparing a drop-resistant and non-slip mobile phone case according to claim 4, characterized in that: The pre-treated silica gel base material comprises: Place the silica gel base material in a heating furnace and heat it at a temperature of 80°C to 100°C; Continue heating for 30 minutes to 1 hour; Use vacuum degassing equipment to remove bubbles and impurities from the silicone base to ensure uniformity during mixing.

6. The method for preparing a drop-resistant and non-slip mobile phone case according to claim 4, characterized in that: The step of adding the functional additives into the silica gel base material and uniformly dispersing the functional additives comprises: adding nano-silica, graphene and carbon nanotubes together with toluene or xylene; Mixing is performed using a high shear mixer with a dispersion time of 1 to 2 hours; The dispersion temperature is controlled at 25°C to 40°C to ensure uniform distribution of the functional additives.

7. The method for preparing a drop-resistant and non-slip mobile phone case according to claim 4, characterized in that: The adding of the composite functional additive and uniformly blending the mixture comprises: adding an antioxidant, a UV absorber, and a plasticizer to the mixture; During the stirring process, the stirring temperature is controlled to be 100°C to 120°C; The stirring speed is set to 200 rpm to 500 rpm, and stirring is continued for 30 minutes to 1 hour to ensure uniform fusion.

8. The method for preparing a drop-resistant and non-slip mobile phone case according to claim 4, characterized in that: The step of fusing the temperature-sensitive polymer with the mixture comprises: adding a temperature-sensitive polymer to the mixture; During the stirring process, the temperature is maintained at 100°C to 120°C; The stirring time is 1 to 2 hours to ensure that the temperature-sensitive polymer is completely dissolved and evenly mixed with other ingredients.

9. The method for preparing a drop-resistant and non-slip mobile phone case according to claim 4, characterized in that: The injection molding comprises: The mixture is fed into the barrel of an injection molding machine, and the injection temperature is set to 150°C to 180°C; The injection pressure is controlled at 60MPa~120MPa; The injection speed was set to 50 cm 3 / min~150cm 3 / min, ensuring that the material fills the mold evenly.

10. The method for preparing a drop-resistant and non-slip mobile phone case according to claim 4, characterized in that: The curing process comprises: Put the injection molded mobile phone shell into a curing oven, and control the curing temperature at 150℃~180℃; The curing time is set to 30 minutes to 60 minutes to ensure that the mobile phone case achieves the required mechanical properties; Peroxide is used during the curing process to promote cross-linking reactions and improve drop resistance.

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