Silicone admixtures, inks and molding materials containing the same, cured products thereof, and methods for manufacturing cured products.

Abstract

We provide a silicone rubber that is biocompatible with the human body and can be manufactured at a lower cost than conventional methods. [Solution] The silicone admixture according to the present invention comprises a casting-type silicone rubber, a vulcanizing agent, and a silicone polymer without crosslinking sites, and can become a cured product with a loss tangent (Tanδ) of 0.2 or more at 10°C to 40°C. The casting-type silicone rubber is a liquid silicone rubber that can be cured by addition reaction, and the vulcanizing agent is a platinum compound. The silicone polymer without crosslinking sites is a dimethyl silicone polymer.

Description

Technical Field

[0001] The present invention relates to a silicone mixture, an ink and a molding material containing the same, a cured product thereof, and a method for producing the cured product.

Background Art

[0002] In recent years, the demand for silicone rubber has been increasing, and the development of silicone rubber having excellent properties is desired.

[0003] In Patent Document 1, a silicone mixture containing a millable silicone rubber, a silicone polymer containing no crosslinking site, a vulcanizing agent, and silica for rubber reinforcement is disclosed. The cured product of the silicone mixture described in Patent Document 1 becomes a silicone rubber having an affinity with the human body.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

[0014] and

[0031] )

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the production of the cured product of the silicone mixture described in Patent Document 1, further reduction of production cost is required.

[0006] An object of the present invention is to provide a silicone rubber having an affinity with the human body that can be produced at a lower cost than before.

Means for Solving the Problems

[0007] In order to solve the above problems, the present invention employs the following means. The present invention provides a silicone admixture comprising a casting-type silicone rubber, a vulcanizing agent, and a high-polymer silicone that does not contain crosslinking sites, which can be cured to have a loss tangent (Tanδ) of 0.2 or more at 10°C to 40°C, as well as inks and molding materials containing the same, and cured products thereof.

[0008] In the silicone admixture according to the above invention, curing the casting-type silicone rubber with a vulcanizing agent can result in a cured product with a Tanδ of 0.2 or higher at 10°C to 40°C. Such a cured product has high affinity with the human body and provides a comfortable feel when used in areas that come into contact with human skin.

[0009] Casting-type silicone rubber can be crosslinked (cured) at lower temperatures and in a shorter time compared to the millable-type silicone rubber described in Patent Document 1. Therefore, by using casting-type silicone rubber, the energy consumption required to manufacture the cured product can be reduced. As a result, manufacturing costs can be lowered.

[0010] Furthermore, since casting-type silicone rubber can be crosslinked at a lower temperature than millable-type silicone rubber, it can be cured together with substrates that have a lower melting point and could not withstand the curing temperature of millable-type silicone rubber. By using such silicone admixtures as inks, the range of material options for printed materials can be broadened.

[0011] Casting-type silicone rubber has lower viscosity compared to millable-type silicone rubber. Therefore, silicone admixtures using casting-type silicone rubber are easier to adjust in viscosity and are suitable for use as molding materials in injection molding and press molding.

[0012] In one embodiment of the above invention, the casting-type silicone rubber is a liquid silicone rubber that can be cured by an addition reaction, and the vulcanizing agent may be a platinum compound.

[0013] In one embodiment of the above invention, the silicone polymer that does not contain the crosslinking sites may be a dimethylsilicone polymer.

[0014] In one embodiment of the above invention, it is preferable that 20 parts by weight or more of a silicone high polymer that does not contain the crosslinking sites are included with respect to 100 parts by weight of the casting-type silicone rubber.

[0015] In the cured product, the cross-linked casting-type silicone rubber and the silicone polymer without cross-linking sites play the roles of the hard segment and the soft segment, respectively. By adjusting the ratio of these, a silicone admixture capable of exhibiting the desired Tanδ after curing can be created.

[0016] In one embodiment of the above invention, the silicone admixture may further contain a low-viscosity silicone oil that does not have a methyl group in its molecule.

[0017] Furthermore, the present invention provides a method for producing a cured product, which involves preparing a mixed solution by mixing a casting-type silicone rubber, a silicone polymer without crosslinking sites, and a vulcanizing agent; printing the mixed solution onto a substrate with a melting point higher than the curing temperature of the mixed solution; and then heating the substrate printed with the mixed solution at a temperature lower than the melting point of the substrate and higher than the curing temperature, thereby obtaining a cured product with a loss tangent (Tanδ) of 0.2 or more at 10°C to 40°C.

[0018] Since the casting-type silicone rubber hardens at a temperature lower than the melting point of the substrate, there is no need to worry about damaging the substrate with heat even if the cured silicone mixture and the substrate are heated together.

[0019] Furthermore, the present invention provides a method for producing a cured product by mixing casting-type silicone rubber, a silicone high polymer without crosslinking sites, and a vulcanizing agent to prepare a mixture, filling the mixture into a mold, and then heating the mold filled with the mixture to 110°C or higher to obtain a cured product with a loss tangent (Tanδ) of 0.2 or higher at 10°C to 40°C.

[0020] By adopting casting-type silicone rubber, a cured product can be manufactured at a low temperature and in a short time as compared with the case of using moldable silicone rubber.

Advantages of the Invention

[0021] According to the present invention, it is possible to provide a silicone rubber having affinity with the human body, which can be manufactured at a lower cost than a cured product of a silicone mixture containing moldable silicone rubber.

Brief Description of the Drawings

[0022] [Figure 1] It is a graph of the frequency dependence of the dynamic viscoelasticity of Example 1. [Figure 2] It is a graph of the frequency dependence of the dynamic viscoelasticity of a cured product obtained by crosslinking casting-type silicone rubber under the same conditions. [Figure 3] It is a graph of the frequency dependence of the dynamic viscoelasticity of Example 2. [Figure 4] It is a graph of the frequency dependence of the dynamic viscoelasticity of Example 3.

Embodiments for Carrying Out the Invention

[0023] Hereinafter, an embodiment of a silicone mixture according to the present invention, an ink and a molding material containing the same, a cured product thereof, and a method for manufacturing the cured product will be described.

[0024] The silicone mixture according to the present embodiment is suitable for use as a silicone ink and as a molding material for injection molding or press molding. The cured product of the silicone mixture has a mechanical loss tangent (Tanδ) of 0.2 or more at 10°C to 40°C.

[0025] The Tanδ of the cured product of the silicone mixture becomes a desired value by optimizing the ratio of casting-type silicone rubber / silicone high polymer.

[0026] (Silicone mixture) The silicone admixture includes casting-type silicone rubber, vulcanizing agents, and high-polymer silicones that do not contain crosslinking sites.

[0027] Casting-type silicone rubber is the main component of a silicone admixture. The "main component" is the component that has the greatest influence on the elastic properties of the silicone rubber (cured product) obtained by curing the silicone admixture.

[0028] Casting-type silicone rubber is a liquid silicone rubber at room temperature. For example, casting-type silicone rubber can have a viscosity of 50 to 2,000 Pa·s at room temperature (23°C).

[0029] Casting-type silicone rubber is a monomer having a molecular weight of several hundred to several thousand. It consists of siloxane bonds with a silicon-oxygen (-Si-O-) backbone and has addition-reactive functional groups in its side chains that contribute to crosslinking. These addition-reactive functional groups are vinyl groups and silicon-bonded hydrogen atoms (Si-H groups). Casting-type silicone rubber may also be composed of an organopolysiloxane having vinyl groups and an organohydrogenpolysiloxane having Si-H groups. In casting-type silicone rubber, crosslinking can occur through an addition reaction using a vulcanizing agent (catalyst), where the Si-H groups react with the vinyl groups. Casting-type silicone rubber may be commercially available liquid silicone rubber for use in LIMS (Liquid Silicone Rubber Injection Molding Systems). The addition reaction temperature (curing temperature) of casting-type silicone rubber is 110°C or higher, preferably 120°C to 150°C. The casting-type silicone rubber may be the KE-1950-3 series from Shin-Etsu Chemical Co., Ltd., the LIM6000 series from Momentive, or the Elastosil LR series from Asahi Kasei Wacker, etc.

[0030] The vulcanizing agent acts as a catalyst. The vulcanizing agent is a platinum compound. In a silicone admixture, the vulcanizing agent should be present in an amount sufficient to cause the addition reaction of almost all addition-reactive functional groups. The vulcanizing agent content, calculated by mass on a catalyst metal element (platinum group metal element) basis relative to the total amount of casting-type silicone rubber, is usually in the range of 0.5 to 1,000 ppm, preferably 1 to 500 ppm, and more preferably in the range of 10 to 100 ppm.

[0031] Casting-type silicone rubber may be a one-component or two-component type. The one-component casting-type silicone rubber contains a first casting-type silicone rubber with vinyl groups and a second casting-type silicone rubber with silicon atom-bonded hydrogen atoms. The vulcanizing agent is mixed with the casting-type silicone rubber immediately before use, and crosslinking occurs by heating. In the two-part type, a first casting-type silicone rubber equipped with vinyl groups and a second casting-type silicone rubber equipped with silicon atom-bonded hydrogen atoms are stored separately. Immediately before use, both are mixed with a vulcanizing agent and crosslinked by heating.

[0032] If the casting-type silicone rubber is a two-component type, one of the components may contain a vulcanizing agent.

[0033] Silicone polymers that do not contain crosslinking sites (hereinafter referred to as silicone polymers) do not have crosslinking sites such as methyl groups and vinyl groups. Silicone polymers do not contribute to accelerating the reaction when casting-type silicone rubber hardens (crosslinks). An example of a silicone polymer is dimethyl silicone polymer. Dimethyl silicone polymers have elasticity and viscosity.

[0034] "High polymers" refer to a series of linear polymers that have been polymerized to such an extent that their physical properties (especially viscoelastic properties) do not change significantly depending on their relative molecular mass (see K6900-1994, ISO 472:1988). More specifically, the molecular weight of "high polymers" is approximately 50,000 to 1,000,000.

[0035] In silicone admixtures, 20 parts by weight or more of high-molecular-weight silicone polymer are contained per 100 parts by weight of casting-type silicone rubber. If the ratio of high-molecular-weight silicone polymer is too low, the loss tangent (Tanδ) of the cured silicone admixture cannot be made 0.2 or higher. If the ratio of high-molecular-weight silicone polymer increases, the viscosity of the silicone admixture also increases. The viscosity of the silicone admixture can be appropriately set depending on the product to which it is applied.

[0036] For example, when applying a silicone admixture to an ink, it is preferable that the amount of silicone high polymer be set to be 20 to 50 parts by weight, preferably 25 to 50 parts by weight, per 100 parts by weight of casting-type silicone rubber.

[0037] For example, when applying a silicone admixture to a molding material for LIMS (Liquid Silicone Rubber Injection Molding System) or press molding, the amount of silicone high polymer should be set to be 20 parts by weight or more and 100 parts by weight or less, preferably 25 parts by weight or more and 100 parts by weight or less, per 100 parts by weight of casting-type silicone rubber.

[0038] The silicone admixture may contain plasticizers, lubricants, and reinforcing agents.

[0039] Plasticizers are substances that can increase the fluidity of silicone admixtures and adjust their viscosity. Plasticizers may be low-viscosity silicone oils that do not contain methyl groups in their molecules. Plasticizers do not contribute to accelerating the reaction during the curing (crosslinking) of casting-type silicone rubber. "Low viscosity" means 100 Pa·s or less.

[0040] In silicone admixtures, the plasticizer content can be appropriately set depending on the content of the high-polymer silicone and the application of the silicone admixture.

[0041] For example, when a silicone admixture is applied to an ink, the plasticizer may be present in an amount of 2.5 times or less, preferably 1.0 to 2.5 times, the amount of the high-polymer silicone that does not contain crosslinking sites.

[0042] For example, when applying a silicone admixture to a LIMS (Liquid Silicone Rubber Injection Molding System) or press molding, the amount of plasticizer may be 0 to 2.5 times the amount of high-molecular-weight silicone that does not contain crosslinking sites.

[0043] Lubricants are additives that suppress the tackiness of silicone rubber and impart slipperiness. Lubricants do not contribute to accelerating the reaction during the curing (crosslinking) of casting-type silicone rubber. Lubricants are preferably silicone-based materials. More specifically, lubricant materials are organosilicone-based.

[0044] When a silicone admixture is applied to a molding material, the lubricant acts as an internal mold release agent. The inclusion of a lubricant reduces the adhesion of the cured silicone admixture to the mold, thus assisting in demolding.

[0045] Lubricants may be added only when necessary for manufacturing. For example, if it is desired to improve shape release, the silicone admixture may contain 0.3 parts by weight or less, preferably 0.2 to 0.3 parts by weight, per 100 parts by weight of the sum of the casting-type silicone rubber and the high-polymer silicone.

[0046] The reinforcing agent consists of silica particles that impart hardness and strength to the cured silicone admixture. The reinforcing agent does not contribute to accelerating the reaction during the curing (crosslinking) of the casting-type silicone rubber.

[0047] In silicone admixtures, the reinforcing agent may be present in amounts of 20 parts by weight or less per 100 parts by weight of the sum of the casting-type silicone rubber and the high-molecular-weight silicone polymer. If there is too much reinforcing agent, the casting-type silicone rubber may be diluted, which may prevent the cross-linking reaction from proceeding. If there is too much reinforcing agent, whitening during deformation will become more pronounced. If there is too little reinforcing agent, the cured product of the silicone admixture will not be able to maintain the desired hardness.

[0048] Lubricants and reinforcing agents should be selected from silicone-based materials with high compatibility, depending on the type of casting-type silicone rubber and silicone polymer. Matching the material systems improves compatibility. Selecting highly compatible materials helps avoid problems such as foaming due to reaction inhibition.

[0049] Furthermore, the silicone admixture may contain additives such as functional minerals, pigments, and fragrances, provided that they do not interfere with the crosslinking reaction of the casting-type silicone rubber and do not affect the Tanδ of the cured product. "Does not affect" means that the loss tangent (Tanδ) at the desired temperature range of 10°C to 40°C falls within the desired range.

[0050] Each component of the silicone admixture is stored separately until immediately before use. In particular, components of casting-type silicone rubber that have addition-reactive functional groups contributing to crosslinking are stored separately from the vulcanizing agent. Each component in the silicone mixture, when mixed immediately before use, is dispersed within the silicone mixture.

[0051] (cured product) A cured product obtained by heating and curing a silicone admixture can have a loss tangent (Tanδ) of 0.2 or more at 10°C to 40°C. The resulting cured product is a thermoplastically curable elastomer exhibiting frequency dependence (dilatancy) of Tanδ.

[0052] The hardness of the cured product (Type A durometer) is preferably between 0 and 30. The hardness of the cured product (JIS-A type) is preferably between 0 and 30. When a high-hardness agent is selected as the casting-type silicone rubber, the influence of the elastic body becomes strong, making it difficult for Tanδ to be expressed. JIS-A type is the hardness obtained by the spring-type hardness tester used in the old JIS (JIS K 6301).

[0053] In the cured product, the cross-linked casting-type silicone rubber acts as a hard segment, governing its elastic properties.

[0054] In cured products, the high-molecular-weight silicone acts as a soft segment, governing the viscous properties.

[0055] By adjusting the ratio of hard and soft segments, a cured product exhibiting the desired Tanδ can be obtained.

[0056] (Method of manufacturing a cured product) First, the components of the silicone admixture according to this embodiment are mixed to prepare the mixture. A mixer or the like may be used for mixing. Since the pot life of the casting-type silicone rubber mixture containing the vulcanizing agent is short, mixing should be done immediately before use. "Immediately before" means within 2 hours, preferably within 1 hour, before the start of use.

[0057] By heating the mixed liquid (silicone admixture) at the curing temperature (addition reaction temperature) of the casting-type silicone rubber for a predetermined time, a cured product of cross-linked casting-type silicone rubber can be obtained. For example, when using KE-1950-3A or KE-1950-3B (manufactured by Shin-Etsu Chemical Co., Ltd.) as the casting-type silicone rubber, it is best to cure it by heating it at 110°C or higher for several tens of seconds to several minutes.

[0058] The cured product may be post-cured (secondary cured) as needed. Secondary curing involves heating at 150°C for 1 hour, for example. Secondary curing can improve the mechanical properties of the cured product (e.g., tensile strength). Secondary curing can also reduce the amount of low molecular weight siloxane remaining in the cured product (approximately 2,000 ppm).

[0059] The curing temperature of casting-type silicone rubber (above 110°C) is lower than that of millable-type silicone rubber (above 170°C). By using casting-type silicone rubber, cured products can be manufactured at lower temperatures, thus reducing the energy consumption required for manufacturing.

[0060] The addition reaction rate of casting-type silicone rubber catalyzed with platinum compounds is faster than the condensation reaction rate of millable-type silicone rubber. The curing time of the casting-type silicone rubber undergoing the addition reaction is about 1 / 6 to 1 / 10 of the curing time of millable-type silicone rubber. By adopting casting-type silicone rubber, manufacturing time can be shortened, and as a result, manufacturing costs can be reduced.

[0061] Application example_Ink: When applying a silicone admixture to an ink, the mixture is printed onto the substrate using screen printing or similar methods, and then the substrate is heated to the curing temperature. The substrate material should have a melting point higher than the curing temperature of the silicone admixture. The heating temperature should be lower than the melting point of the substrate and higher than the curing temperature.

[0062] By using casting-type silicone rubber, which hardens at lower temperatures and in a shorter time than millable-type silicone rubber, the range of materials that can be used for printing becomes wider than when using millable-type silicone rubber. For example, thermoplastic resins and synthetic fibers can also be used as materials for printing.

[0063] By using casting-type silicone rubber, the ink can be cured at a temperature lower than the melting point of the printed material. This prevents thermal damage to the printed material even when the ink and the printed material are heated and cured together.

[0064] Liquid addition-reaction type casting silicone rubber has lower viscosity compared to millable-type silicone rubber. The ink using the silicone mixture according to this embodiment is easier to handle and adheres better to the printed material compared to the case where highly viscous millable-type silicone rubber is used.

[0065] Application example - Molding material: When applying a silicone admixture to a molding material, the mixture is filled into a mold, and then the mold filled with the mixture is heated for a predetermined time at the curing temperature (addition reaction temperature) of the casting-type silicone rubber to obtain a cured product in which the casting-type silicone rubber is crosslinked. The curing temperature is, for example, 110°C or higher.

[0066] By using casting-type silicone rubber, it is possible to bond and mold it with materials other than metal, such as rubber and thermoplastic resins.

[0067] By using a liquid casting-type silicone rubber with lower viscosity than millable-type silicone rubber, the viscosity of the silicone admixture can be reduced, making it easier to fill into the mold. Furthermore, molded products can be obtained in a shorter time compared to using millable-type silicone rubber.

[0068] The LIMS using the silicone admixture according to this embodiment as a molding material supports burr-free and runner-less molding, and depending on the product shape, automation of the molding process is also possible. The silicone admixture according to this embodiment is suitable as a molding material and as a molding material to be applied to press molding systems. In press molding, it is preferable to thoroughly degas the mixture before heating. [Examples]

[0069] (Example 1) material: (A) Casting type silicone rubber KE-1950-3A, KE-1950-3B (manufactured by Shin-Etsu Chemical Co., Ltd.; the vulcanizing agent is included in KE-1950-3A) (B) Silicone high polymer TSE200 (manufactured by Momentive Performance Materials Japan LLC) (C) Plasticizer KE96-100 (manufactured by Shin-Etsu Chemical Co., Ltd., kinematic viscosity (25℃) 100mm) 3 / s) (D) Reinforcement agent Nipsil LP (manufactured by Tosoh Silica Co., Ltd., precipitated silica particles (powder)) (E) Lubricant RN-1 (manufactured by Asahi Kasei Wacker Silicone Co., Ltd.)

[0070] A silicone admixture (mixture) was prepared by mixing 100 parts by weight of component (A) with 26 parts by weight of component (B), 42 parts by weight of component (C), 0 parts by weight of component (D), and 0.2 parts by weight of component (E).

[0071] The silicone mixture was placed in a mold and heated at 120°C for 1.5 minutes to crosslink the casting silicone rubber and obtain a cured product.

[0072] The physical properties of the resulting cured product were evaluated. For comparison, instead of the casting-type silicone rubber described above, a silicone admixture was prepared using millable-type silicone rubber (Comparative Example 1: ELASTOSIL® EL 7101 and low-viscosity silicone oil manufactured by Asahi Kasei Wacker Silicone Co., Ltd., and Comparative Example 2: ELASTOSIL® EL 7101 manufactured by Asahi Kasei Wacker Silicone Co., Ltd.). This admixture was heated at 170°C for 10 minutes to prepare a cured product with crosslinked millable-type silicone rubber, and its physical properties were evaluated in the same manner. The results are shown in Table 1.

[0073] [Table 1]

[0074] *1 Type A durometer *2,3 A dumbbell-shaped test specimen No. 3 was punched out from the cured material, and a tensile test was performed on the obtained specimen in accordance with JIS C3005. The tensile test was performed under conditions of a tensile speed of 500 mm / min and a gauge spacing of 20 mm, and the tensile strength (MPa) and elongation at break (%) were measured. *5 For test specimens measuring 10 mm in width and 40 mm in length, the storage modulus E' and loss modulus E'' of the specimens were measured using a viscoelasticity measuring device (DMS6100, manufactured by SII Nanotechnology Co., Ltd.) at different measurement frequencies. The measurement conditions were: measurement mode: tensile, displacement amplitude: 20 μm, measurement temperature: 25 °C, and measurement frequency: 0.01 Hz to 100 Hz. The ratio of the loss modulus E'' to the storage modulus E' (E'' / E'') was defined as Tanδ. Table 1 shows the Tanδ at 30 °C.

[0075] Figure 1 is a graph showing the frequency dependence of the dynamic viscoelasticity of Example 1. According to Figure 1, the storage modulus E' and loss modulus E'' of the cured product of Example 1 increased with increasing frequency. The Tanδ of the cured product of Example 1 was highest around 1 Hz. This confirms that the cured product of Example 1 has frequency dependence (dilatancy). The cured product of Example 1 had a Tanδ of 0.2 or greater.

[0076] The reason why dilatancy occurred in the cured product of Example 1 is thought to be due to the "continuous thermal motion of polymer molecules" occurring in the temperature range near room temperature.

[0077] As Comparative Example 3, Figure 2 shows a graph of the frequency dependence of the dynamic viscoelasticity of a cured product obtained by crosslinking the casting-type silicone rubber described in (A) under the same conditions. According to Figure 2, when only the casting-type silicone rubber was cured, there was a slight tendency for the storage modulus E' and loss modulus E'' to increase as the frequency increased, but no peak value was observed in Tanδ. From this, it can be said that the cured product of Comparative Example 3 does not have dilatancy.

[0078] Furthermore, it has been confirmed that dilatancy was hardly observed in the cured products of Comparative Examples 1 and 2.

[0079] Furthermore, in tests using KE-76BS (manufactured by Shin-Etsu Chemical Co., Ltd.) instead of TSE200 as the (B) high-polymer silicone, it was confirmed that the same dilatancy as in Example 1 was observed.

[0080] (Examples 2, 3) Silicone admixtures (mixtures) were prepared by changing the material composition of Example 1, and cured products were obtained in the same manner as in Example 1 (Examples 2 and 3). The dynamic viscoelasticity of the obtained cured products was evaluated in the same manner as in Example 1. The proportions of the material components in Examples 2 and 3 are shown in Table 2.

[0081] [Table 2]

[0082] Figure 3 is a graph of the frequency dependence of the dynamic viscoelasticity of Example 2. In Figure 3, a clear dilatant property is shown from E'E'', and a tanδ of 0.2 or more is shown at 0.1 to 10 Hz, which are the main movement frequencies of the human body, and especially at 1 Hz.

[0083] Figure 4 is a graph of the frequency dependence of the dynamic viscoelasticity of Example 3. In Figure 4, a clearer dilatant property than E'E'' is shown, and a tanδ of 0.2 or greater is shown at the central motion frequency of the human body, 0.2 to 5 Hz, and especially at 1 Hz.

[0084] Although Figures 1, 3, and 4 show measurement results at 30°C, it has been confirmed that similar results can be obtained in the range of 10°C to 40°C.

Claims

1. Casting-type silicone rubber and vulcanizing agent and A high-polymer silicone that does not contain cross-linking sites, Includes, A silicone admixture that can be cured to have a loss tangent (Tanδ) of 0.2 or higher at temperatures between 10°C and 40°C.

2. The aforementioned casting-type silicone rubber is a liquid silicone rubber that can be cured by an addition reaction. The silicone admixture according to claim 1, wherein the vulcanizing agent is a platinum compound.

3. The silicone admixture according to claim 1, wherein the silicone high polymer that does not contain the aforementioned crosslinking sites is a dimethyl silicone high polymer.

4. The silicone admixture according to claim 1, wherein 100 parts by weight of the casting-type silicone rubber contains 20 parts by weight or more of a silicone high polymer that does not contain the crosslinking sites.

5. The silicone admixture according to claim 1, further comprising a low-viscosity silicone oil that does not have a methyl group in its molecule.

6. An ink containing the silicone admixture described in claim 1.

7. A molding material comprising the silicone admixture described in claim 1.

8. A cured product of the silicone admixture according to claim 1.

9. A mixture is prepared by mixing casting-type silicone rubber, a high-polymer silicone without cross-linking sites, and a vulcanizing agent. A method for producing a cured product, comprising printing the aforementioned mixture onto a substrate with a melting point higher than the curing temperature of the mixture, and then heating the substrate printed with the mixture at a temperature lower than the melting point of the substrate and higher than the curing temperature, to obtain a cured product with a loss tangent (Tanδ) of 0.2 or more at 10°C to 40°C.

10. A mixture is prepared by mixing casting-type silicone rubber, a high-polymer silicone without cross-linking sites, and a vulcanizing agent. A method for producing a cured product, comprising filling a mold with the aforementioned mixture, heating the mold filled with the mixture to 110°C or higher, and obtaining a cured product with a loss tangent (Tanδ) of 0.2 or higher at 10°C to 40°C.

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