A fragrance-rich silicone rubber and its preparation method

Abstract

This invention relates to the field of silicone rubber technology, specifically to a scented silicone rubber and its preparation method. The silicone rubber comprises the following raw materials in parts by weight: 100 parts vinyl polydimethylsiloxane, 40-80 parts modified fragrance, 10-20 parts wear-resistant filler, 5-10 parts inorganic filler, 10-15 parts phenyl silicone oil, 3-6 parts heat-resistant additive, 5-10 parts hydrogen-containing silicone oil, 0.1-0.5 parts platinum catalyst, and 0.05-0.1 parts inhibitor. The silicone rubber of this invention not only possesses excellent properties such as heat resistance, wear resistance, aging resistance, and good elasticity, but also emits a long-lasting fragrance.

Description

Technical Field

[0001] This invention relates to the field of silicone rubber technology, specifically to a silicone rubber with a natural fragrance and its preparation method. Background Technology

[0002] With the development of wearable devices, in order to improve the texture of wearable devices and obtain a luxurious feel, most of them use high-density rubber, such as fluororubber. However, perfluorohexanoic acid (PFHxA), a fluorinated organic compound, belongs to perfluorinated and polyfluoroalkyl substances. It is not environmentally friendly and cannot be recycled. It has non-degradable and bioaccumulative toxicity, which is harmful to both the human body and the environment.

[0003] Silicone rubber, which emerged in the early 1940s, has the following advantages compared to ordinary rubber: 1) Excellent cold and heat resistance, allowing use in environments ranging from -50 to 300℃; 2) Ozone and weather resistance, enabling long-term outdoor use; 3) Electrical insulation and flame retardancy, suitable for sheathing wires and cables; 4) Chemical resistance, high breathability, high biocompatibility, and non-toxic and non-polluting properties, making it suitable for wearable devices. However, traditional silicone rubber on the market lacks a slow-release fragrance function; therefore, developing scented silicone rubber can further meet market demand. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to overcome the problems existing in the prior art and provide a silicone rubber with a natural fragrance and a method for preparing the same.

[0005] On the one hand, this application provides a scented silicone rubber, achieved through the following technical solution: A scented silicone rubber comprises the following raw materials in parts by weight: 100 parts vinyl polydimethylsiloxane, 40-80 parts modified fragrance, 10-20 parts wear-resistant filler, 5-10 parts inorganic filler, 10-15 parts phenyl silicone oil, 3-6 parts heat-resistant additive, 5-10 parts hydrogen-containing silicone oil, 0.1-0.5 parts platinum catalyst, and 0.05-0.1 parts inhibitor. The silicone rubber of this application not only possesses excellent properties such as heat resistance, wear resistance, aging resistance, and good elasticity, but also emits a long-lasting fragrance. While retaining the inherent characteristics of silicone rubber, it also overcomes the drawback of the pungent odor of traditional rubber, enriching the application functions of silicone rubber.

[0006] Preferably, the modified fragrance is a modified silica fragrance. This application combines the reinforcing agent silica and the fragrance by modifying silica, and adds the modified fragrance to the silicone rubber system, giving the silicone rubber its own fragrance. Furthermore, the addition of silica improves the wear resistance and mechanical strength of the silicone rubber, resulting in silicone rubber with excellent wear resistance, tensile strength, and tear strength.

[0007] Preferably, the wear-resistant filler is polyetheretherketone resin. Polyetheretherketone resin itself has high temperature resistance, wear resistance, chemical corrosion resistance, and also has excellent mechanical strength and dimensional stability. When added to a silicone rubber system, the composite of polyetheretherketone resin and silicone rubber can effectively improve the mechanical properties of silicone rubber.

[0008] Preferably, the inorganic filler is nano-zirconia. More preferably, the nano-zirconia is 30-50 nm in size. Even more preferably, the nano-zirconia is modified with a silane coupling agent; the silane coupling agent is KH550 or KH560. Nano-zirconia is a high-hardness ceramic. Adding it as an inorganic filler to a silicone rubber system can significantly improve the wear resistance of silicone rubber. Furthermore, the melting point of nano-zirconia is as high as 2000℃, which can effectively improve the heat resistance of silicone rubber. Nano-zirconia has a large specific surface area and surface energy. Directly adding it to a silicone rubber system can easily lead to agglomeration. Modifying the surface of nano-zirconia with a silane coupling agent transforms the hydrophilic surface into a hydrophobic surface, allowing the nano-zirconia to be uniformly dispersed in the silicone rubber system, thereby enhancing the wear resistance and heat resistance of silicone rubber.

[0009] Preferably, the heat-resistant additive is selected from iron oxide or cerium oxide. Phenyl silicone oil can introduce rigid phenyl groups into the silicone rubber molecular chain, resulting in higher bond energy and greater steric hindrance. This effectively inhibits the silicone rubber molecular chain from biting back or breaking under high-temperature conditions. Iron and cerium can undergo redox reactions under high-temperature and aerobic conditions, preventing the silicone rubber molecular chain from cross-linking, hardening, and becoming brittle due to free radical oxidation. Simultaneously adding phenyl silicone oil and the heat-resistant additive, as a composite heat-resistant material, can exert a synergistic effect, effectively improving the heat resistance of silicone rubber.

[0010] Preferably, the platinum catalyst is selected from one or more of the following: Karstedt catalyst, Lamoreaux catalyst, and Ashby catalyst.

[0011] Preferably, the inhibitor is selected from one or more of ethynylcyclohexanol, dimethylhexynol, and 3,7,11-trimethyldodecyn-3-ol.

[0012] Preferably, the preparation method of the modified silica fragrance is as follows: 1) First, the fragrance, silane precursor, silane coupling agent, surfactant, water and anhydrous ethanol in parts by weight are mixed together, and after high-speed stirring and ultrasonic dispersion, an oil-in-water solution is formed; 2) Then, the catalyst is added to the system, stirred and reacted, filtered, washed and dried to obtain the modified silica fragrance. More preferably, the fragrance is selected from one or more of rose essential oil, jasmine essential oil and osmanthus essential oil; the silane precursor is selected from tetraethoxysilane; the silane coupling agent is selected from one or more of APTES, MPTES and GPTES; the surfactant is selected from hexadecyltrimethylammonium bromide; and the catalyst is selected from ammonia water. More preferably, the weight ratio of fragrance:silane precursor:silane coupling agent:water:anhydrous ethanol:catalyst is 1-1.5:1-1.5:0.5-1:25-30:15-20:1-1.5. Modified silica fragrances were prepared using a sol-gel method. This method utilizes the hydrolysis and condensation reactions between a silane precursor and a silane coupling agent to form a complete modified silica shell on the surface of the fragrance. The modified silica fragrance of this application possesses a core-shell structure and can release fragrance slowly and continuously.

[0013] On the other hand, this application provides a method for preparing a scented silicone rubber, which is achieved through the following technical solution.

[0014] A method for preparing a scented silicone rubber includes the following steps: S1. Add vinyl polydimethylsiloxane, modified fragrance, wear-resistant filler, inorganic filler, phenyl silicone oil and heat-resistant additive to a mixing container according to the weight parts, mix evenly to obtain component A, and take it out for later use. S2. Add the hydrogen-containing silicone oil and inhibitor to the mixing container according to the weight parts, mix evenly to obtain component B, and set it aside for later use. S3. Add components A and B together to the mixer and mix evenly. Finally, add the platinum catalyst to the mixer and vulcanize and cure to obtain a scented silicone rubber.

[0015] Preferably, the mixing temperature in S3 is 150-180℃, the mixing pressure is 15-20MPa, and the mixing time is 5-15min.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The silicone rubber of this invention, which has its own fragrance, not only has excellent properties such as heat resistance, wear resistance, aging resistance and good elasticity, but also can emit fragrance and the fragrance is long-lasting.

[0017] 2. The preparation method of the fragrance-infused silicone rubber of the present invention is simple and easy to operate, the raw materials are readily available, and the obtained silicone rubber has excellent mechanical properties and can continuously emit fragrance. Detailed Implementation

[0018] The present invention will now be described in detail with reference to specific embodiments. It should also be noted that, to make the embodiments more comprehensive, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement the invention for some well-known technologies.

[0019] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0020] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0021] The sources of raw materials used in the following examples and comparative examples are as follows: Example 1 A scented silicone rubber comprises the following raw materials in parts by weight: 100 parts vinyl polydimethylsiloxane, 40 parts modified fragrance, 10 parts wear-resistant filler, 5 parts inorganic filler, 10 parts phenyl silicone oil, 3 parts heat-resistant additive, 5 parts hydrogen-containing silicone oil, 0.1 parts platinum catalyst, and 0.05 parts inhibitor.

[0022] Preferably, the modified fragrance is made from modified silica fragrance.

[0023] Preferably, the wear-resistant filler is polyetheretherketone resin.

[0024] Preferably, the inorganic filler is nano-zirconia. More preferably, the nano-zirconia is 30 nm. Even more preferably, the nano-zirconia is modified with a silane coupling agent; the silane coupling agent is KH550.

[0025] Preferably, the heat-resistant additive is iron oxide.

[0026] Preferably, the platinum catalyst is a Karstedt catalyst.

[0027] Preferably, the inhibitor is ethynylcyclohexanol.

[0028] Preferably, the preparation method of the modified silica fragrance is as follows: 1) First, the fragrance, silane precursor, silane coupling agent, surfactant, water and anhydrous ethanol in parts by weight are mixed together, and after high-speed stirring and ultrasonic dispersion, an oil-in-water solution is formed; 2) Then, the catalyst is added to the system, stirred and reacted, filtered, washed and dried to obtain the modified silica fragrance. More preferably, the fragrance is made of rose essential oil; the silane precursor is tetraethoxysilane; the silane coupling agent is APTES; the surfactant is hexadecyltrimethylammonium bromide; and the catalyst is ammonia. More preferably, the weight ratio of fragrance:silane precursor:silane coupling agent:water:anhydrous ethanol:catalyst is 1:1:0.5:25:15:1.

[0029] A method for preparing a scented silicone rubber includes the following steps: S1. Add vinyl polydimethylsiloxane, modified fragrance, wear-resistant filler, inorganic filler, phenyl silicone oil and heat-resistant additive to a mixing container according to the weight parts, mix evenly to obtain component A, and take it out for later use. S2. Add the hydrogen-containing silicone oil and inhibitor to the mixing container according to the weight parts, mix evenly to obtain component B, and set it aside for later use. S3. Add components A and B together to the mixer and mix evenly. Finally, add the platinum catalyst to the mixer and vulcanize and cure to obtain a scented silicone rubber.

[0030] Preferably, the mixing temperature in S3 is 150°C, the mixing pressure is 15MPa, and the mixing time is 5min.

[0031] Example 2 A scented silicone rubber comprises the following raw materials in parts by weight: 100 parts vinyl polydimethylsiloxane, 80 parts modified fragrance, 20 parts wear-resistant filler, 10 parts inorganic filler, 15 parts phenyl silicone oil, 6 parts heat-resistant additive, 10 parts hydrogen-containing silicone oil, 0.5 parts platinum catalyst, and 0.1 parts inhibitor.

[0032] Preferably, the modified fragrance is made from modified silica fragrance.

[0033] Preferably, the wear-resistant filler is polyetheretherketone resin.

[0034] Preferably, the inorganic filler is nano-zirconia. More preferably, the nano-zirconia is 50 nm. Even more preferably, the nano-zirconia is modified with a silane coupling agent; the silane coupling agent is KH560.

[0035] Preferably, the heat-resistant additive is cerium oxide.

[0036] Preferably, the platinum catalyst is a Lamoreaux catalyst.

[0037] Preferably, the inhibitor is dimethylhexynol.

[0038] Preferably, the preparation method of the modified silica fragrance is as follows: 1) First, the fragrance, silane precursor, silane coupling agent, surfactant, water and anhydrous ethanol in parts by weight are mixed together, and after high-speed stirring and ultrasonic dispersion, an oil-in-water solution is formed; 2) Then, the catalyst is added to the system, stirred and reacted, filtered, washed and dried to obtain the modified silica fragrance. More preferably, the fragrance is selected from jasmine essential oil; the silane precursor is selected from tetraethoxysilane; the silane coupling agent is selected from MPTES; the surfactant is selected from hexadecyltrimethylammonium bromide; and the catalyst is selected from ammonia water. More preferably, the weight ratio of fragrance:silane precursor:silane coupling agent:water:anhydrous ethanol:catalyst is 1.5:1.5:1:30:20:1.5.

[0039] A method for preparing a scented silicone rubber includes the following steps: S1. Add vinyl polydimethylsiloxane, modified fragrance, wear-resistant filler, inorganic filler, phenyl silicone oil and heat-resistant additive to a mixing container according to the weight parts, mix evenly to obtain component A, and take it out for later use. S2. Add the hydrogen-containing silicone oil and inhibitor to the mixing container according to the weight parts, mix evenly to obtain component B, and set it aside for later use. S3. Add components A and B together to the mixer and mix evenly. Finally, add the platinum catalyst to the mixer and vulcanize and cure to obtain a scented silicone rubber.

[0040] Preferably, the mixing temperature in step S3 is 180°C, the mixing pressure is 20 MPa, and the mixing time is 15 min.

[0041] Example 3 A scented silicone rubber comprises the following raw materials in parts by weight: 100 parts vinyl polydimethylsiloxane, 50 parts modified fragrance, 12 parts wear-resistant filler, 6 parts inorganic filler, 11 parts phenyl silicone oil, 4 parts heat-resistant additive, 6 parts hydrogen-containing silicone oil, 0.2 parts platinum catalyst, and 0.06 parts inhibitor.

[0042] Preferably, the modified fragrance is made from modified silica fragrance.

[0043] Preferably, the wear-resistant filler is polyetheretherketone resin.

[0044] Preferably, the inorganic filler is nano-zirconia. More preferably, the nano-zirconia is 34 nm. Even more preferably, the nano-zirconia is modified with a silane coupling agent; the silane coupling agent is KH550.

[0045] Preferably, the heat-resistant additive is selected from iron oxide or cerium oxide.

[0046] Preferably, the platinum catalyst is an Ashby catalyst.

[0047] Preferably, the inhibitor is 3,7,11-trimethyldodecyn-3-ol.

[0048] Preferably, the preparation method of the modified silica fragrance is as follows: 1) First, the fragrance, silane precursor, silane coupling agent, surfactant, water and anhydrous ethanol in parts by weight are mixed together, and after high-speed stirring and ultrasonic dispersion, an oil-in-water solution is formed; 2) Then, the catalyst is added to the system, stirred and reacted, filtered, washed and dried to obtain the modified silica fragrance. More preferably, the fragrance is selected from osmanthus essential oil; the silane precursor is selected from tetraethoxysilane; the silane coupling agent is selected from GPTES; the surfactant is selected from hexadecyltrimethylammonium bromide; and the catalyst is selected from ammonia water. More preferably, the weight ratio of fragrance:silane precursor:silane coupling agent:water:anhydrous ethanol:catalyst is 1.25:1:0.6:26:16:1.25.

[0049] A method for preparing a scented silicone rubber includes the following steps: S1. Add vinyl polydimethylsiloxane, modified fragrance, wear-resistant filler, inorganic filler, phenyl silicone oil and heat-resistant additive to a mixing container according to the weight parts, mix evenly to obtain component A, and take it out for later use. S2. Add the hydrogen-containing silicone oil and inhibitor to the mixing container according to the weight parts, mix evenly to obtain component B, and set it aside for later use. S3. Add components A and B together to the mixer and mix evenly. Finally, add the platinum catalyst to the mixer and vulcanize and cure to obtain a scented silicone rubber.

[0050] Preferably, the mixing temperature in S3 is 155°C, the mixing pressure is 16 MPa, and the mixing time is 7 min.

[0051] Example 4 A scented silicone rubber comprises the following raw materials in parts by weight: 100 parts vinyl polydimethylsiloxane, 60 parts modified fragrance, 14 parts wear-resistant filler, 7 parts inorganic filler, 12 parts phenyl silicone oil, 5 parts heat-resistant additive, 7 parts hydrogen-containing silicone oil, 0.3 parts platinum catalyst, and 0.07 parts inhibitor.

[0052] Preferably, the modified fragrance is made from modified silica fragrance.

[0053] Preferably, the wear-resistant filler is polyetheretherketone resin.

[0054] Preferably, the inorganic filler is nano-zirconia. More preferably, the nano-zirconia is 38 nm. Even more preferably, the nano-zirconia is modified with a silane coupling agent; the silane coupling agent is KH560.

[0055] Preferably, the heat-resistant additive is iron oxide.

[0056] Preferably, the platinum catalyst is a Karstedt catalyst.

[0057] Preferably, the inhibitor is ethynylcyclohexanol.

[0058] Preferably, the preparation method of the modified silica fragrance is as follows: 1) First, the fragrance, silane precursor, silane coupling agent, surfactant, water and anhydrous ethanol in parts by weight are mixed together, and after high-speed stirring and ultrasonic dispersion, an oil-in-water solution is formed; 2) Then, the catalyst is added to the system, stirred and reacted, filtered, washed and dried to obtain the modified silica fragrance. More preferably, the fragrance is made of rose essential oil; the silane precursor is tetraethoxysilane; the silane coupling agent is APTES; the surfactant is hexadecyltrimethylammonium bromide; and the catalyst is ammonia. More preferably, the weight ratio of fragrance:silane precursor:silane coupling agent:water:anhydrous ethanol:catalyst is 1.35:1.2:0.7:27:17:1.25.

[0059] A method for preparing a scented silicone rubber includes the following steps: S1. Add vinyl polydimethylsiloxane, modified fragrance, wear-resistant filler, inorganic filler, phenyl silicone oil and heat-resistant additive to a mixing container according to the weight parts, mix evenly to obtain component A, and take it out for later use. S2. Add the hydrogen-containing silicone oil and inhibitor to the mixing container according to the weight parts, mix evenly to obtain component B, and set it aside for later use. S3. Add components A and B together to the mixer and mix evenly. Finally, add the platinum catalyst to the mixer and vulcanize and cure to obtain a scented silicone rubber.

[0060] Preferably, the mixing temperature in S3 is 160°C, the mixing pressure is 17MPa, and the mixing time is 9min.

[0061] Example 5 A scented silicone rubber comprises the following raw materials in parts by weight: 100 parts vinyl polydimethylsiloxane, 70 parts modified fragrance, 16 parts wear-resistant filler, 8 parts inorganic filler, 13 parts phenyl silicone oil, 4 parts heat-resistant additive, 8 parts hydrogen-containing silicone oil, 0.4 parts platinum catalyst, and 0.08 parts inhibitor.

[0062] Preferably, the modified fragrance is made from modified silica fragrance.

[0063] Preferably, the wear-resistant filler is polyetheretherketone resin.

[0064] Preferably, the inorganic filler is nano-zirconia. More preferably, the nano-zirconia is 42 nm. Even more preferably, the nano-zirconia is modified with a silane coupling agent; the silane coupling agent is KH550.

[0065] Preferably, the heat-resistant additive is iron oxide.

[0066] Preferably, the platinum catalyst is a Lamoreaux catalyst.

[0067] Preferably, the inhibitor is dimethylhexynol.

[0068] Preferably, the preparation method of the modified silica fragrance is as follows: 1) First, the fragrance, silane precursor, silane coupling agent, surfactant, water and anhydrous ethanol in parts by weight are mixed together, and after high-speed stirring and ultrasonic dispersion, an oil-in-water solution is formed; 2) Then, the catalyst is added to the system, stirred and reacted, filtered, washed and dried to obtain the modified silica fragrance. More preferably, the fragrance is made of jasmine essential oil; the silane precursor is tetraethoxysilane; the silane coupling agent is MPTES; the surfactant is hexadecyltrimethylammonium bromide; and the catalyst is ammonia. More preferably, the weight ratio of fragrance:silane precursor:silane coupling agent:water:anhydrous ethanol:catalyst is 1.5:1:0.8:28:18:1.5.

[0069] A method for preparing a scented silicone rubber includes the following steps: S1. Add vinyl polydimethylsiloxane, modified fragrance, wear-resistant filler, inorganic filler, phenyl silicone oil and heat-resistant additive to a mixing container according to the weight parts, mix evenly to obtain component A, and take it out for later use. S2. Add the hydrogen-containing silicone oil and inhibitor to the mixing container according to the weight parts, mix evenly to obtain component B, and set it aside for later use. S3. Add components A and B together to the mixer and mix evenly. Finally, add the platinum catalyst to the mixer and vulcanize and cure to obtain a scented silicone rubber.

[0070] Preferably, the mixing temperature in S3 is 170°C, the mixing pressure is 18 MPa, and the mixing time is 11 min.

[0071] Example 6 A scented silicone rubber comprises the following raw materials in parts by weight: 100 parts vinyl polydimethylsiloxane, 75 parts modified fragrance, 18 parts wear-resistant filler, 9 parts inorganic filler, 14 parts phenyl silicone oil, 4.5 parts heat-resistant additive, 9 parts hydrogen-containing silicone oil, 0.5 parts platinum catalyst, and 0.09 parts inhibitor.

[0072] Preferably, the modified fragrance is made from modified silica fragrance.

[0073] Preferably, the wear-resistant filler is polyetheretherketone resin.

[0074] Preferably, the inorganic filler is nano-zirconia. More preferably, the nano-zirconia is 46 nm. Even more preferably, the nano-zirconia is modified with a silane coupling agent; the silane coupling agent is KH560.

[0075] Preferably, the heat-resistant additive is cerium oxide.

[0076] Preferably, the platinum catalyst is an Ashby catalyst.

[0077] Preferably, the inhibitor is 3,7,11-trimethyldodecyn-3-ol.

[0078] Preferably, the preparation method of the modified silica fragrance is as follows: 1) First, the fragrance, silane precursor, silane coupling agent, surfactant, water and anhydrous ethanol in parts by weight are mixed together, and after high-speed stirring and ultrasonic dispersion, an oil-in-water solution is formed; 2) Then, the catalyst is added to the system, stirred and reacted, filtered, washed and dried to obtain the modified silica fragrance. More preferably, the fragrance is made of osmanthus essential oil; the silane precursor is tetraethoxysilane; the silane coupling agent is GPTES; the surfactant is hexadecyltrimethylammonium bromide; and the catalyst is ammonia. More preferably, the weight ratio of fragrance:silane precursor:silane coupling agent:water:anhydrous ethanol:catalyst is 1.5:1.2:0.6:25:18:1.

[0079] A method for preparing a scented silicone rubber includes the following steps: S1. Add vinyl polydimethylsiloxane, modified fragrance, wear-resistant filler, inorganic filler, phenyl silicone oil and heat-resistant additive to a mixing container according to the weight parts, mix evenly to obtain component A, and take it out for later use. S2. Add the hydrogen-containing silicone oil and inhibitor to the mixing container according to the weight parts, mix evenly to obtain component B, and set it aside for later use. S3. Add components A and B together to the mixer and mix evenly. Finally, add the platinum catalyst to the mixer and vulcanize and cure to obtain a scented silicone rubber.

[0080] Preferably, the mixing temperature in S3 is 175°C, the mixing pressure is 20 MPa, and the mixing time is 13 min.

[0081] Comparative Example 1 The difference between this comparative example and Example 4 is that fragrance and silica are added directly, that is, the modified fragrance is replaced with an equal amount of fragrance and silica.

[0082] Comparative Example 2 The difference between this comparative example and Example 5 is that an equal amount of nano-silica was used to replace nano-zirconia, i.e., no inorganic filler was added.

[0083] Comparative Example 3 The difference between this comparative example and Example 6 is that cerium oxide was replaced with an equal amount of phenyl silicone oil, i.e., no heat-resistant additives were added.

[0084] Performance testing: Samples of the scented silicone rubber prepared in Examples 1-6 and Comparative Examples 1-3 were taken and injection molded into test strips for testing. The test results are shown in the table below.

[0085] As can be seen from the table above, the silicone rubber prepared in Examples 1-6 has excellent mechanical properties, as well as excellent wear resistance, heat resistance and aging resistance. Furthermore, by adding modified fragrance, the silicone rubber has a stable and long-lasting fragrance, without the pungent odor of traditional silicone rubber.

[0086] By comparing Examples 1-6 and Comparative Example 1, it was found that the silicone rubber in Comparative Example 1 was prepared by directly adding equal amounts of fragrance and silica, without using silica to encapsulate the fragrance. The resulting silicone rubber had a significantly weaker and less lasting fragrance. This indicates that the present application, by adding modified fragrance and using silica to encapsulate the fragrance, utilizes the core-shell structure of the modified fragrance. The reinforcing agent silica can play a reinforcing role while also continuously and slowly releasing fragrance.

[0087] By comparing Examples 1-6 and Comparative Example 2, the silicone rubber in Comparative Example 2 was prepared by replacing zirconium dioxide with an equal amount of silica, i.e., without adding inorganic fillers. The wear resistance and heat resistance of the prepared silicone rubber decreased significantly. This shows that by adding the inorganic filler zirconium dioxide, this application utilizes the properties of zirconium dioxide to improve the wear resistance and heat resistance of silicone rubber in the silicone rubber system.

[0088] By comparing Examples 1-6 and Comparative Example 3, the silicone rubber of Comparative Example 3 was prepared by replacing cerium oxide with an equal amount of phenyl silicone oil, i.e. no composite heat-resistant material was added. The heat resistance of the silicone rubber prepared was reduced. This shows that the present application improves the heat resistance of silicone rubber by adding phenyl silicone oil and heat-resistant additives at the same time. The two are composite materials and play a synergistic role.

[0089] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0090] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A type of silicone rubber with a natural fragrance, characterized in that: The raw materials include the following parts by weight: 100 parts of vinyl polydimethylsiloxane, 40-80 parts of modified fragrance, 10-20 parts of wear-resistant filler, 5-10 parts of inorganic filler, 10-15 parts of phenyl silicone oil, 3-6 parts of heat-resistant additive, 5-10 parts of hydrogen-containing silicone oil, 0.1-0.5 parts of platinum catalyst and 0.05-0.1 parts of inhibitor.

2. The fragrance-rich silicone rubber according to claim 1, characterized in that: The modified fragrance is made from modified silica fragrance.

3. The fragrance-rich silicone rubber according to claim 1, characterized in that: The wear-resistant filler is made of polyetheretherketone resin.

4. The fragrance-rich silicone rubber according to claim 1, characterized in that: The inorganic filler is nano-zirconia.

5. The fragrance-rich silicone rubber according to claim 1, characterized in that: The heat-resistant additive is selected from iron oxide or cerium oxide.

6. The fragrance-rich silicone rubber according to claim 1, characterized in that: The platinum catalyst is selected from one or more of the following: Karstedt catalyst, Lamoreaux catalyst, and Ashby catalyst.

7. The fragrance-rich silicone rubber according to claim 1, characterized in that: The inhibitor is selected from one or more of ethynylcyclohexanol, dimethylhexynol, and 3,7,11-trimethyldodecyn-3-ol.

8. The fragrance-rich silicone rubber according to claim 2, characterized in that: The preparation method of the modified silica fragrance is as follows: 1) First, mix the fragrance, silane precursor, silane coupling agent, surfactant, water and anhydrous ethanol in parts by weight, and form an oil-in-water solution after high-speed stirring and ultrasonic dispersion; 2) Then add the catalyst to the system, stir to react, filter, wash and dry to obtain the modified silica fragrance.

9. A method for preparing a fragrance-rich silicone rubber as described in any one of claims 1-8, characterized in that: Includes the following steps: S1. Add vinyl polydimethylsiloxane, modified fragrance, wear-resistant filler, inorganic filler, phenyl silicone oil and heat-resistant additive to a mixing container according to the weight parts, mix evenly to obtain component A, and take it out for later use. S2. Add the hydrogen-containing silicone oil and inhibitor to the mixing container according to the weight parts, mix evenly to obtain component B, and set it aside for later use. S3. Add components A and B together to the mixer and mix evenly. Finally, add the platinum catalyst to the mixer and vulcanize and cure to obtain a scented silicone rubber.

10. The method for preparing the fragrance-rich silicone rubber according to claim 9, characterized in that: The mixing temperature in S3 is 150-180℃, the mixing pressure is 15-20MPa, and the mixing time is 5-15min.

Images