Composition, plastic cement manufacturing method, plastic cement, wrist strap and wearable device

Abstract

The invention provides a composition, a manufacturing method of plastic, the plastic, a wrist strap and wearable equipment. The composition comprises the following raw materials in parts by mass: 100 parts of raw fluororubber; 20-50 parts by mass of a filler; 1-5 parts by mass of an auxiliary agent; the difference value between the refractive index of a material obtained by crosslinking the raw fluororubber and the auxiliary agent and the refractive index of the filler is smaller than a preset threshold value. The composition provided by the invention is simple in composition, low in manufacturing cost and high in safety, and the refractive index of the introduced filler is controlled to be approximately consistent with the refractive index of a material obtained by crosslinking the fluororubber raw rubber and the assistant by controlling the proportion of the fluororubber raw rubber, the filler and the assistant; therefore, the plastic formed by the composition has good transparency.

Description

Technical Field

[0001] The present disclosure relates to the field of plastic technology, and in particular to a composition, a method for manufacturing plastic, plastic, a wristband and a wearable device. Background Art

[0002] Wearable devices usually use plastic products to make their limiting parts worn on the human body. Wearable devices are gradually used as accessories. Therefore, users' requirements for the appearance of wearable devices are gradually increasing, and new demands have been generated for accessories such as transparent wristbands and bracelets.

[0003] In order to obtain transparent plastic materials, silicone rubber and polyurethane are usually used as raw materials for production. However, during the preparation process, silicone oil, plasticizers and other additives are often added, which can easily cause human allergies. Fluorine rubber raw rubber has low allergenicity. In the prior art, when using fluorine rubber raw rubber as raw material to make transparent plastic, the following methods are usually used: a. Introducing perfluoroether monomers to achieve the material's own high temperature yellowing resistance to make transparent fluorine rubber; b. Compounding materials to achieve the transparency of plastics; c. Modifying fluorine rubber raw rubber and inorganic fillers separately to achieve the transparency of the produced plastics.

[0004] However, among the above commonly used methods, the first two methods will limit the application of fillers, resulting in a higher production cost of transparent plastics. In the last method, as disclosed in CN115558313A, the coupling agent introduced therein contains perfluorooctyl, and perfluorooctyl materials have been proven to be harmful to human safety. The plastic material produced therefrom cannot be used in wearable devices. Summary of the invention

[0005] In order to overcome the problems existing in the related art, the present disclosure provides a composition, a method for manufacturing plastic, plastic, a wristband and a wearable device.

[0006] According to a first aspect of the present disclosure, a composition is provided, comprising the following raw materials in parts by weight:

[0007] Fluororubber raw rubber: 100 parts by mass;

[0008] Filler: 20-50 parts by mass;

[0009] Additives: 1-5 parts by weight;

[0010] Wherein, the difference between the refractive index of the material obtained after cross-linking the fluororubber raw rubber and the auxiliary agent and the refractive index of the filler is less than a preset threshold.

[0011] In some embodiments of the present disclosure, the refractive index of the filler is 1.45-1.70.

[0012] In some embodiments of the present disclosure, the particle size of the filler is 0.5 μm-100.0 μm.

[0013] In some embodiments of the present disclosure, the filler includes one or more of polyimide, polyester, polyphenylene ether, polyphenylene sulfide, polylactic acid, polyamide, epoxy resin, melamine, phenolic resin, polyformaldehyde, polymethyl methacrylate, polyethylene, polystyrene, polyvinyl chloride, and polytetrafluoroethylene.

[0014] In some embodiments of the present disclosure, the fluororubber raw rubber includes one or more of type 23 fluororubber, type 24 fluororubber, type 26 fluororubber, type 46 fluororubber, type 246 fluororubber, perfluoroether rubber, and parafluoroether rubber.

[0015] In some embodiments of the present disclosure, the auxiliary agent includes one or more of sulfur, a peroxide cross-linking agent, a platinum catalyst, an amine cross-linking agent, and triallyl isocyanurate.

[0016] According to a second aspect of the present disclosure, a method for manufacturing plastic is provided, the method for manufacturing plastic comprising:

[0017] Under a first preset condition, fluororubber raw rubber, filler and additive are mixed and kneaded to obtain a rubber mixture; wherein the fluororubber raw rubber is 100 parts by mass, the filler is 20-50 parts by mass, the additive is 1-5 parts by mass, and the difference between the refractive index of the material obtained by cross-linking the fluororubber raw rubber and the additive and the refractive index of the filler is less than a preset threshold;

[0018] Under the second preset condition, the mixed rubber is subjected to a molding process to obtain a semi-finished plastic product;

[0019] Under a third preset condition, the semi-finished plastic is heat treated to obtain the plastic.

[0020] In some embodiments of the present disclosure, the mixing process includes a banburying process and an open mixing process in sequence;

[0021] The first preset conditions of the banburying process include: a banburying temperature of 80°C-130°C and a banburying time of 3min-10min;

[0022] The first preset conditions of the open refining process include an open refining temperature of 60°C-100°C and an open refining time of 5min-20min.

[0023] In some embodiments of the present disclosure, the second preset condition includes: the molding process temperature is 160° C.-185° C., the molding process time is 5 min-12 min; and / or,

[0024] The third preset condition includes: the heat treatment temperature is 150° C.-185° C.; the heat treatment time is 1 h-4 h.

[0025] According to a third aspect of the present disclosure, a plastic is provided, wherein the plastic is manufactured by the method for manufacturing the plastic provided by the second aspect of the present disclosure.

[0026] According to a fourth aspect of the present disclosure, a wristband is provided, wherein the wristband is made by the plastic manufacturing method provided by the second aspect of the present disclosure.

[0027] According to a fifth aspect of the present disclosure, a wearable device is provided, wherein the wearable device includes a device body and the wristband provided by the fourth aspect of the present disclosure.

[0028] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the composition provided by the present disclosure has simple components, low production cost, high safety, and by controlling the ratio of fluororubber raw rubber, filler and additives, and controlling the refractive index of the introduced filler to be close to the refractive index of the material obtained after cross-linking the fluororubber raw rubber and the additives, the plastic formed by the composition has good transparency.

[0029] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. DETAILED DESCRIPTION

[0030] Here, exemplary embodiments are described in detail. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are only examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0031] In order to obtain a transparent plastic material with lower sensitization, fluororubber raw rubber is usually used as raw material for production. The following are some existing typical examples of transparent plastics made of fluororubber raw rubber as raw material. In CN115466344A, perfluoromethyl vinyl ether, tetrafluoroethylene, and hexafluoropropylene are used as the main polymerization monomers. Since the molecular chain does not contain hydrogen, the material's own high temperature yellowing is achieved, and it can be guaranteed that the material will not change color after vulcanization to make transparent fluororubber. However, this method limits the application of fillers, making the material cost higher, and the cross-linking reaction activity of perfluoroether materials is low, which is not conducive to the application of materials. In CN115232419A, after mixing two different types of fluororubber raw rubber materials, a specific temperature control method is used to prepare a plastic with a color-transmitting effect. However, the amount of filler added in this method is severely limited, which leads to a rise in cost. In CN115558313A, fluororubber raw rubber and inorganic filler are modified separately, and the coupling agent introduced when modifying the filler contains perfluorooctyl. Perfluorooctyl materials have been proven to be harmful to human safety, and the plastic materials produced therefrom cannot be used in wearable devices.

[0032] In view of this, the present disclosure provides a composition, which includes the following raw materials in parts by mass: 100 parts by mass of fluororubber raw rubber; 20-50 parts by mass of filler; 1-5 parts by mass of auxiliary agent; the difference between the refractive index of the material obtained after the fluororubber raw rubber and the auxiliary agent are cross-linked and the refractive index of the filler is less than a preset threshold. The composition provided by the present disclosure has simple components, low production cost, high safety, and by controlling the ratio of fluororubber raw rubber, filler and auxiliary agent, and controlling the refractive index of the introduced filler to be close to the refractive index of the material obtained after the fluororubber raw rubber and the auxiliary agent are cross-linked, so that the plastic formed by the composition has good transparency.

[0033] An exemplary embodiment of the present disclosure provides a composition, which includes the following raw materials in parts by mass: fluororubber raw rubber: 100 parts by mass; filler: 20-50 parts by mass; additive: 1-5 parts by mass; the difference between the refractive index of the material obtained after cross-linking the fluororubber raw rubber and the additive and the refractive index of the filler is less than a preset threshold.

[0034] In the present embodiment, the mass parts of fluororubber raw rubber is a fixed value, i.e. 100 mass parts, as a benchmark for the mass parts of regulating filler and auxiliary agent. In the composition, because the CF bond energy in the fluororubber raw rubber is very high, and the radius of the fluorine atom is small, the fluorine atom can be closely arranged around the carbon atom, forming a protective barrier of the CC bond, so that the CC bond has higher chemical inertness. In addition, the bond energy of the fluorinated carbon atom combined with other atoms is also improved accordingly, so that the fluororubber raw rubber has good heat resistance and corrosion resistance, and at the same time, the fluorine atom makes the free rotation energy of the fluorine-containing compound chemical bond promoted, so that the fluorocarbon elastomer has good rigidity. The fluororubber raw rubber provided in the present embodiment is a rubber material that has not been vulcanized, for example, it can include one or more of 23 type fluororubber, 24 type fluororubber, 26 type fluororubber, 46 type fluororubber, 246 type fluororubber, perfluoroether rubber, and parafluoroether rubber.

[0035] Auxiliary agents can play an auxiliary role in the molding process of fluororubber raw rubber, and the auxiliary agents can include auxiliary agents with different functions such as crosslinking agents and accelerators. Wherein, under suitable process conditions, the crosslinking agent can cause a chemical reaction between the linear molecular chain in the fluororubber raw rubber and the crosslinking agent, or cause the linear molecular chains in the fluororubber raw rubber to react chemically with each other, so that the linear molecular chains in the fluororubber raw rubber are crosslinked to form a three-dimensional network structure, so as to enhance the elastic strength, wear resistance and mechanical strength of the formed plastic. The accelerator can promote the activation of the crosslinking agent, thereby accelerating the crosslinking reaction between the crosslinking agent and the fluororubber raw rubber molecules, so as to shorten the time of the crosslinking reaction, reduce the crosslinking temperature, thereby increasing the output and reducing the cost. In the case where the fluororubber raw rubber has a fixed mass of 100 mass parts, the auxiliary agent is controlled to be in a suitable mass to ensure that the plastic formed after the fluororubber raw rubber and the auxiliary agent are crosslinked has good mechanical properties. Exemplarily, the mass of the auxiliary agent is 1-5 mass parts, preferably 2-4 mass parts.

[0036] In some embodiments, the auxiliary agent includes one or more of sulfur, peroxide crosslinking agent, platinum catalyst, amine crosslinking agent, and triallyl isocyanurate (TAIC), and the above auxiliary agents can cause the molecular chains in the fluororubber raw rubber to undergo crosslinking reaction (commonly known as vulcanization reaction). Exemplarily, the peroxide crosslinking agent generally refers to a crosslinking agent having a peroxide group (-OO-) in the molecule, and according to different types of groups, the peroxide crosslinking agent may include dialkyl peroxide, peroxy ketal, diacyl peroxide and the like. Among them, dialkyl peroxides may include diisopropylbenzene peroxide (commonly known as DCP), di(tert-butylperoxyisopropyl)benzene (commonly known as BIPB) and 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (commonly known as double two five); peroxy ketal may include 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane (commonly known as 3M); diacyl peroxide may include di(2,4-dichlorobenzoyl) peroxide, which is commonly known as double two four. Amine crosslinking agents may include N, N-secinnamyl-1,6-hexanediamine (commonly known as No. 3 vulcanizing agent), triethylenetetramine, tetraethylenepentamine, etc.

[0037] Since fluororubber raw rubber has self-reinforcement, that is, without adding reinforcing agent, fluororubber raw rubber can be oriented and crystallized at low temperature or during stretching, and the grains are distributed in amorphous rubber to act as physical crosslinking points, so that its own strength is improved. Therefore, in the process of preparing plastic with fluororubber raw rubber as raw material, the filler provided in the present embodiment does not need to have a reinforcing effect, and the filler is dispersed in the fluororubber raw rubber in the form of solid particles to reduce the manufacturing cost of the plastic. The difference between the refractive index of the filler and the refractive index of the material obtained after crosslinking the fluororubber raw rubber and the auxiliary agent is controlled to be less than the preset threshold, that is, the refractive index of the two tends to be consistent, so that the plastic finally formed has a good transparent effect, and the cost of transparent plastic production is reduced at the same time. The preset threshold can be a value pre-set by a technician, which can be set based on the demand for transparency. For example, when the transparency demand is high, the preset threshold can be set to a smaller value, such as 0.03, 0.02, 0.01 and other values, so that the refractive index of the filler is the same or almost the same as the refractive index of the material obtained after crosslinking the fluororubber raw rubber and the auxiliary agent. When the transparency requirement is low, the preset threshold can be set to a larger value, such as 0.07, 0.09, 0.10, etc.

[0038] In the case where the fluororubber raw rubber has a fixed mass of 100 mass parts, when there are too many fillers, although the production cost of the plastic material is reduced, it is easy to have an adverse effect on the mechanical properties and transparency of the formed plastic material; when the filler is too little, the production cost of the plastic material increases. Therefore, the filler is controlled to be at an appropriate mass part to balance the transparency, production cost and mechanical properties of the subsequently formed plastic material. Exemplarily, the filler is 20-50 mass parts, preferably 25-40 mass parts, and more preferably 25-35 mass parts.

[0039] Based on the refractive index of the plastic material obtained after crosslinking the fluororubber raw rubber and the additive, the refractive index of the filler is controlled to be between 1.45-1.70, so that the difference between the refractive index of the filler and the refractive index of the plastic material obtained after crosslinking the fluororubber raw rubber and the additive is less than a preset threshold value, so as to ensure that the formed plastic has good transparency. In some examples, the refractive index of the filler is controlled to be between 1.51-1.65, and the transparency of the formed plastic is better.

[0040] Exemplarily, the particle size of the filler ranges from 0.5 μm to 100.0 μm. When the particle size of the filler is too large, it is easy to cause the mechanical properties and reliability of the formed plastic material to decrease, and it is easy to affect the uniformity of the overall refractive index of the plastic material, affecting the transparency of the plastic material; when the particle size of the filler is too small, when the filler is mixed with fluororubber raw rubber and additives, the filler is easy to agglomerate and cannot achieve a uniform dispersion effect, affecting the material distribution and the uniformity of the refractive index distribution. Controlling the particle size of the filler within a suitable range can balance the mechanical properties and the uniformity of the refractive index distribution of the transparent plastic material formed subsequently. In some embodiments, the particle size of the filler ranges from 15 μm to 50 μm.

[0041] Exemplarily, when selecting the material for forming the filler, it should be ensured that the filler does not react with the fluororubber raw rubber and / or the additive, so that the refractive index of the filler is in a stable value or value range. At the same time, the melting point of the filler should be in a higher range to reduce the probability of the filler melting due to heat during the production process of the plastic, or to reduce the amount of the filler melting due to heat. Exemplarily, the filler can include one or more of polyimide, polyester, polyphenylene ether, polyphenylene sulfide, polylactic acid, polyamide, epoxy resin, melamine, phenolic resin, polyoxymethylene, polymethyl methacrylate, polyethylene, polystyrene, polyvinyl chloride, and polytetrafluoroethylene, and these materials can form hard plastic microspheres as fillers.

[0042] The composition provided by the present disclosure has simple components, and there is no need to modify the filler or fluororubber raw rubber. The composition can be used as a raw material to produce a plastic with good transparency and high safety. At the same time, since the difference between the refractive index of the filler and the refractive index of the material obtained after cross-linking the fluororubber raw rubber and the auxiliary agent is small, the amount of the filler used has a large adjustment range under the premise of ensuring the mechanical strength of the plastic, which can reduce the production cost of the transparent plastic and has little impact on the transparency of the plastic.

[0043] The present disclosure also provides a method for making plastic, the method for making plastic comprising the following steps:

[0044] Step S100, under a first preset condition, mixing fluororubber raw rubber, filler and additives and performing a mixing process to obtain a mixed rubber; wherein the fluororubber raw rubber is 100 parts by mass, the filler is 20-50 parts by mass, the additive is 1-5 parts by mass, and the difference between the refractive index of the material obtained after cross-linking the fluororubber raw rubber and the additive and the refractive index of the filler is less than a preset threshold;

[0045] Step S200, molding the mixed rubber under the second preset condition to obtain a semi-finished plastic;

[0046] Step S300: heat-treating the semi-finished plastic under a third preset condition to obtain plastic.

[0047] In step S100, the composition consisting of fluororubber raw rubber, filler and additives is the raw material for forming plastic. The composition consisting of fluororubber raw rubber, filler and additives can be the composition provided by the above embodiment of the present disclosure, and each component is expressed in parts by mass as follows: fluororubber raw rubber: 100 parts by mass; filler: 20-50 parts by mass; additive: 1-5 parts by mass. The difference between the refractive index of the material obtained after cross-linking the fluororubber raw rubber and the additive and the refractive index of the filler is controlled to be less than a preset threshold value, so that the finally formed plastic has good transparency. Exemplarily, before the filler is mixed with the fluororubber raw rubber and the additive, the filler can be fully cleaned and dried to remove dust or impurities attached to the surface of the filler to avoid the introduced dust or impurities affecting the transparency of the plastic.

[0048] Fluorine rubber raw rubber, fillers and additives are put into a device for mixing treatment, for example, they can be put into a banbury mixer or an open mixer, and the fluororubber raw rubber, fillers and additives are mixed and evenly dispersed under the mechanical action of the equipment to obtain a mixed rubber. In the mixed rubber, the filler is evenly dispersed in the form of solid particles, so that the plastic material formed subsequently has a uniform material distribution, so that the plastic material has good transparency and reliability. The first preset condition can be the operating parameters of the mixing equipment set by the technician according to the composition and ratio of each raw material put into the mixing equipment, for example, it can include mixing temperature and mixing time. Exemplarily, the mixing process can include a banburying process and an open mixing process in sequence, that is, the fluororubber raw rubber, fillers and additives can be put into a banbury mixer for a banburying process, and then the materials can be transferred to an open mixer for an open mixing process to obtain a mixed rubber. The first preset condition corresponding to the banburying process can include: a banburying temperature of 80°C-130°C and a banburying time of 3min-10min. The first preset condition of the open-mixing process may include: the open-mixing temperature is 60°C-100°C, and the open-mixing time is 5min-20min. Since the internal mixer used in the internal mixing process is a closed container, the processing temperature of the internal mixing process is higher than the processing temperature of the open-mixing process. The open-mixing process can improve the uniformity of the obtained mixed rubber by subjecting the composition to the internal mixing process. At the same time, the open-mixing process can better relax the rubber material, so that the shrinkage rate of the subsequently formed plastic tends to be stable.

[0049] In step S200, when the rubber compound is subjected to molding, different processes such as calendering, extrusion, compression molding, injection molding, etc. can be used to produce semi-finished plastic of a desired shape and size. The semi-finished plastic formed can be the shape and size of the product to be made of the transparent plastic material, or can be any other shape, and the transparent plastic material formed by the semi-finished plastic is subsequently used to make a product of a desired shape. The second preset condition can be the operating parameters of the molding equipment set by the technician according to the components of the raw materials in the rubber compound, for example, it can include the processing temperature and processing time of the molding equipment.

[0050] Exemplarily, the second preset condition may specifically include the processing time and processing temperature of the molding process. The processing temperature of the molding process may be any temperature value between 160°C and 185°C, and the processing time of the molding process may be 5min-12min. In some embodiments, the processing time of the molding process may be adjusted based on the processing temperature. The higher the processing temperature, the shorter the corresponding processing time. Since a certain temperature is provided to the rubber compound during the molding process and lasts for a certain period of time, the additives in the rubber compound will cause some fluororubber raw rubber molecular chains to cross-link. However, due to the short duration, the additives in the molded semi-finished plastic may not react completely, that is, part of the cross-linking reaction has not been completed, and not all fluororubber raw rubber molecules have undergone cross-linking.

[0051] In step S300, heat treatment is to provide a specific temperature to the semi-finished plastic so that the additives in the semi-finished plastic can function, the fluororubber molecular chains can be completely cross-linked, and the fluororubber molecular chains can react chemically to form a three-dimensional network structure, thereby obtaining a transparent plastic with good elastic strength, mechanical strength and wear resistance. The third preset condition can be an equipment operating parameter set by the technician according to the composition of each raw material forming the semi-finished plastic, for example, it can include heat treatment time and heat treatment temperature.

[0052] Exemplarily, the temperature range for heat treatment of semi-finished plastics can be 150°C-185°C. In some examples, the heat treatment temperature can be between 160°C-185°C. Since the fluororubber raw rubber is provided with an auxiliary agent for cross-linking, a longer heat treatment time needs to be provided. The heat treatment time can be between 1h-4h, so that the fluororubber molecular chains in the semi-finished plastics can fully undergo cross-linking, and at the same time, the stress in the semi-finished plastics can be eliminated, so that the formed plastic has good mechanical properties. Exemplarily, the heat treatment time can be adjusted based on the heat treatment temperature. The higher the heat treatment temperature, the shorter the corresponding heat treatment time. During the heat treatment process, some fillers in the semi-finished plastics may be heated and in a molten state. After the heat treatment is completed, since the fillers will not react with the rubber molecules and the cross-linking agent, the molten fillers will gradually condense during the cooling process of the plastic, and will not have an adverse effect on the overall refractive index of the plastic.

[0053] It is understandable that before the semi-finished plastic is heat-treated, the semi-finished plastic can be placed in deionized water or a polar solvent to remove dust or impurities attached to the surface of the semi-finished plastic to avoid affecting the transparency of the plastic.

[0054] In an exemplary embodiment, the present disclosure further provides a plastic, which is made of the composition provided in the above embodiment of the present disclosure as a raw material and is produced by the method for producing the plastic provided in the above embodiment. Since the refractive index of the filler introduced in the raw material for forming the plastic tends to be consistent with the refractive index of the cross-linked plastic, the production cost of the transparent plastic can be reduced while ensuring the transparency of the plastic. At the same time, the produced plastic has good mechanical strength and reliability, which is conducive to the mass production of transparent plastic and has certain industrial practicality. In addition, when the plastic provided in this embodiment is used as a raw material to produce a product, its good transparency and safety can meet the user's appearance requirements and enhance the user's use experience.

[0055] In order to more clearly explain the technical solution of the present disclosure, the following are specific examples of using the composition provided by the present disclosure to make plastics, wherein the components used in each example, the weight parts and the performance parameters of the formed plastics are shown in Tables 1 to 2, and the size and shape of the samples tested in each example are the same.

[0056] Table 1: Components and performance parameters of plastics corresponding to Examples 1-8

[0057]

[0058] Table 2: Components and performance parameters of plastics corresponding to Examples 9-16

[0059]

[0060]

[0061] It can be seen from the above embodiments that the plastic made of the composition provided by the present disclosure as a raw material has good transparency, and the maximum light transmittance can reach 72%, and the formed transparent plastic has good tensile strength, which can reach up to 8.2MPa, ensuring that the products made of the plastic have good mechanical reliability. In addition, the transparent plastic formed by the present disclosure also has a high elongation at break, which exceeds 300%, that is, the transparent plastic has good softness, elasticity and toughness, and is not easy to break when subjected to external impact, which can improve the service life and reliability of products made of transparent plastic.

[0062] In an exemplary embodiment, the present disclosure further provides a wristband, which can be a fixed structure for fixing an item on a user's wrist, such as a watch strap, a wristband, or a wristband set on a mobile phone, a water cup, an earphone box, and other convenient items, and the present disclosure does not limit this. The wristband is made of the transparent plastic provided in the above embodiment of the present disclosure. For example, the transparent plastic can be used as a raw material, and the transparent plastic can be shaped, trimmed, polished, sprayed, etc. according to the required shape and size of the wristband to form the wristband. Exemplarily, in the process of making the transparent plastic, when the mixed rubber is molded, a mold or molding parameters can be set according to the required shape and size of the wristband, so that the molded semi-finished plastic is the shape of the wristband, so that the formed plastic is the required transparent wristband, and the present disclosure does not limit this. The wristband provided by the present disclosure has good transparency and mechanical strength, and uses fluororubber raw rubber as a raw material for making, which has low allergenicity. When the wristband contacts the user's skin, the occurrence of sensitive phenomena can be reduced, and the user's use experience can be improved.

[0063] In an exemplary embodiment, the present disclosure also provides a wearable device, which may include, for example, mobile phones, watches, bracelets and other devices that can be worn on the user's body, and the wearable device includes the wristband and device body provided in the above embodiments. The device body is used to realize the main functions of the wearable device, and the wristband can be fixedly connected to the device body or detachably connected. Through the wristband, the user can fix the device body on the user's body, for example, on the user's wrist. Since the wristband of the wearable device has good mechanical strength, safety and transparency, and also has low allergenicity, when the user wears and fixes the wearable device, it can meet the user's requirements for the appearance of the wearable device and improve the user's satisfaction with the use.

[0064] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed in this disclosure. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0065] It should be understood that the present invention is not limited to the precise construction that has been described above and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A composition, characterized in that The composition comprises the following raw materials in parts by weight: Fluororubber raw rubber: 100 parts by mass; Filler: 20-50 parts by mass; Additives: 1-5 parts by weight; Wherein, the difference between the refractive index of the material obtained after cross-linking the fluororubber raw rubber and the auxiliary agent and the refractive index of the filler is less than a preset threshold.

2. The composition according to claim 1, characterized in that The refractive index of the filler is 1.45-1.

70.

3. The composition according to claim 1, characterized in that The particle size of the filler is 0.5 μm-100.0 μm.

4. The composition according to claim 1, characterized in that The filler includes one or more of polyimide, polyester, polyphenylene ether, polyphenylene sulfide, polylactic acid, polyamide, epoxy resin, melamine, phenolic resin, polyoxymethylene, polymethyl methacrylate, polyethylene, polystyrene, polyvinyl chloride, and polytetrafluoroethylene.

5. The composition according to claim 1, characterized in that The fluororubber raw rubber includes one or more of type 23 fluororubber, type 24 fluororubber, type 26 fluororubber, type 46 fluororubber, type 246 fluororubber, perfluoroether rubber, and parafluoroether rubber.

6. The composition according to claim 1, characterized in that The auxiliary agent includes one or more of sulfur, a peroxide crosslinking agent, a platinum catalyst, an amine crosslinking agent, and triallyl isocyanurate.

7. A method for making plastic, characterized in that: The method for making the plastic comprises: Under a first preset condition, fluororubber raw rubber, filler and additive are mixed and kneaded to obtain a rubber mixture; wherein the fluororubber raw rubber is 100 parts by mass, the filler is 20-50 parts by mass, the additive is 1-5 parts by mass, and the difference between the refractive index of the material obtained by cross-linking the fluororubber raw rubber and the additive and the refractive index of the filler is less than a preset threshold; Under the second preset condition, the mixed rubber is subjected to a molding process to obtain a semi-finished plastic product; Under a third preset condition, the semi-finished plastic is heat treated to obtain the plastic.

8. The method for making plastic according to claim 7, characterized in that: The mixing process includes a banburying process and an open mixing process in sequence; The first preset conditions of the banburying process include: a banburying temperature of 80°C-130°C and a banburying time of 3min-10min; The first preset conditions of the open refining process include: an open refining temperature of 60° C.-100° C. and an open refining time of 5 min-20 min.

9. The method for making plastic according to claim 7, characterized in that: The second preset conditions include: the molding process temperature is 160° C.-185° C., the molding process time is 5 min-12 min; and / or, The third preset condition includes: the heat treatment temperature is 150° C.-185° C.; the heat treatment time is 1 h-4 h.

10. A plastic, characterized in that: The plastic is produced by the method for producing plastic according to any one of claims 7 to 9.

11. A wristband, characterized in that: The wristband is made by the plastic making method described in any one of claims 7 to 9.

12. A wearable device, characterized in that: The wearable device comprises a device body and the wristband according to claim 11.

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