WO2018178451A1 - Two-part silicone elastomer composition for modelling - Google Patents

Two-part silicone elastomer composition for modelling Download PDF

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Publication number
WO2018178451A1
WO2018178451A1 PCT/ES2018/070228 ES2018070228W WO2018178451A1 WO 2018178451 A1 WO2018178451 A1 WO 2018178451A1 ES 2018070228 W ES2018070228 W ES 2018070228W WO 2018178451 A1 WO2018178451 A1 WO 2018178451A1
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WIPO (PCT)
Prior art keywords
component
composition
curing
product
weight
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PCT/ES2018/070228
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Spanish (es)
French (fr)
Inventor
Xavier LARRAÑAGA GARMENDIA
Juan Antonio GARATE ALDAZ
Original Assignee
Siliconas Silam, S.A.
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Application filed by Siliconas Silam, S.A. filed Critical Siliconas Silam, S.A.
Publication of WO2018178451A1 publication Critical patent/WO2018178451A1/en

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/54—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/54—Silicon-containing compounds
    • C08K5/541—Silicon-containing compounds containing oxygen
    • C08K5/5415—Silicon-containing compounds containing oxygen containing at least one Si—O bond
    • C08K5/5419—Silicon-containing compounds containing oxygen containing at least one Si—O bond containing at least one Si—C bond

Definitions

  • the present invention relates to a new two component silicone elastomeric composition for modeling. It can be used for various purposes, either for the personalization of the form of products for recreational use, both domestic and for teaching, as well as for obtaining molds for duplicating or copying objects for industrial or artistic use in both jewelry and Arts & Crafts .
  • Patent ES2389759 discloses a curable silicone composition in 24 hours at room temperature and ambient humidity, comprising polydimethylsiloxane, pyrogenic silica treated with silane, magnesium silicate, a hydrolysable silane crosslinking agent and an amount of a catalyst, preferably a compound of tin such as dibutyltin dilaurate. It is a composition of a surface curable product, so that under this surface, the composition can still be modeled. However, to stop curing and continue molding at a later time, the product must be packaged in airtight and vacuum packaging. All product not packaged properly loses the property of being modeled afterwards and must be wasted.
  • Patent CN101671482 describes a bicomponent silicone of room temperature curing for the manufacture of manual modeling toys.
  • the bicomponent silicone is formed by a putty component and a catalyst component, where the ratio between both components is 1: 1.
  • the putty component comprises methyl vinyl silicone oil, a methyl vinyl silicone crosslinking agent, an inhibitor, low density microspheres, a hydrogen sequestering agent, a mold releasing agent, a plasticizer and a filling.
  • the inhibitor is a low molecular weight liquid of the siloxane type.
  • the catalyst component comprises silica gel, a complex coordination compound of methyl vinyl siloxane and platinum, low density microspheres, a mold release agent, a plasticizer and a filler.
  • the material described in CN101671482 is not curable at high temperature, whereby said silicone composition is limited to very specific uses.
  • thermoplastic high temperature curing materials have also been described, for example, by hot air or hot water, where curing takes place by evaporation of the solvent.
  • the US patent US5431563 discloses a thermoplastic article for customizable molding parts of devices such as dental plates or handles or sports equipment, in which the polymerized thermoplastic composition maintains its hardness after polymerization at temperatures around 37 e C and can be molded repeatedly repeatedly when heated between about 50 e C and 95 e C.
  • the composition comprises a liquid methyl methacrylate monomer, a liquid butyl methacrylate monomer and a mixture of plasticizers.
  • said composition polymerizes and can become repeatedly woven when heated to temperatures between 50 e C to 95 e C.
  • a pulverized polymer of polyethyl methacrylate that hardens at least substantially, with temperatures below 95 e C
  • said composition polymerizes and can become repeatedly woven when heated to temperatures between 50 e C to 95 e C.
  • the preparation of the polymerized thermoplastic composition is complex and difficult to carry out by an inexperienced user, especially the proper mixing of quantities of each of the components, as well as the correct spraying of the polymer that integrates the composition.
  • the international patent application WO201425078 discloses a clay composition for modeling, which is curable with hot air.
  • the modeling clay composition is prepared by mixing together a base silicone in a gelled state that is formed by mixing siloxane, silicone, vinyl finished group, methyl vinyl, dimethyl, a plasticity regulator made of a silica-based powder material to regulate hardness, an oily anti-caking agent made of a polydimethylsiloxane material to prevent agglomerate, an antimicrobial agent, and a platinum curing agent.
  • a base silicone in a gelled state that is formed by mixing siloxane, silicone, vinyl finished group, methyl vinyl, dimethyl
  • a plasticity regulator made of a silica-based powder material to regulate hardness
  • an oily anti-caking agent made of a polydimethylsiloxane material to prevent agglomerate, an antimicrobial agent, and a platinum curing agent.
  • the three types of technologies for curing or vulcanizing silicones are generally known to a person skilled in the art: 1) hot crosslinking, 2) crosslinking at room temperature, and 3) UV radiation curing.
  • Hot crosslinking in general, is carried out by peroxides that generate free radicals with a first mold consolidation stage at approximately 125 ° C, followed by a second post-curing stage for the removal of peroxides, water and small molecules originated, or by means of polysiloxane oligomer hardeners with hydride side group + Pt catalyst, where the reaction takes place in approximately 10-20 seconds at 175-190 ° C and in which the speed can be regulated with the presence of inhibitors or retarders in the composition.
  • Cross-linking at room temperature in a general way is carried out by means of a condensation mechanism that is initiated by the ambient water vapor.
  • UV radiation curing is limited to pieces of small thickness that do not need temperature, nor humidity of the environment.
  • an elastomeric silicone composition of easy preparation by an inexperienced user does not yet exist in the state of the art, with a curing time at room temperature long enough for the user to customize his design and model it without difficulty. that at the same time is suitable to cure at room temperature, at high temperature or by the effect of electromagnetic waves.
  • the present invention has been made in view of the state of the art described above.
  • the object of the present invention is to provide an elastomeric silicone composition that has a sufficiently long curing time so that a user can model the design of a product at room temperature, can be prepared easily, safely and efficiently by any inexperienced user. as, for example, a child, which is also suitable to cure at room temperature, at high temperature or by electromagnetic radiation and support extreme temperatures.
  • the elastomeric silicone composition of the invention is versatile in terms of curing the composition.
  • the product modeled with it has improved properties that make it useful for different recreational and industrial applications.
  • the elastomeric composition of the invention solves the drawbacks of the state of the art, also presenting other advantages that will be described below.
  • the two component silicone elastomeric composition is characterized by the fact that it comprises high consistency polydimethylsiloxane elastomer and by the fact that the composition is a binary mixture of a component A and a component B, the ratio between component A and component B substantially close to 1: 1,
  • component A includes the following ingredients: 40-85% polydimethylsiloxane elastomer, reinforcing filler such as pyrogenic silica and / or 10-30% precipitated silica, curing agent: polyhydrogenomethylsiloxane and 0.5-10%, the percentages being expressed in weight with respect to the weight of component A, with the condition that the sum of all components do not exceed 100%, and
  • Component B includes the following ingredients: 40-85% polydimethylsiloxane elastomer, reinforcing filler such as pyrogenic silica and / or 10-30% precipitated silica, platinum catalyst: 1-8% and pigments: up to 5%, being the percentages expressed in weight with respect to the weight of component B, with the proviso that the sum of all components does not exceed 100%.
  • high temperature in the present invention is meant a temperature greater than 80 ° C, preferably comprised between 150 and 300 ° C.
  • the two-component silicone elastomeric composition mixed with substantially equal parts of its two components A and B has a Mooney viscosity before of curing between 15 and 75 mPa s and a Shore hardness after curing between 10 and 80 Sh A.
  • the silicone selected in the composition of the present invention is "high consistency polydimethylsiloxane elastomer", which is presented in the form of a moldable polydimethylsiloxane paste, where "high consistency” indicates that the polydimethylsiloxane elastomer includes reinforcing fillers such as pyrogenic silica and / or precipitated silica that provide said "high consistency" to the resulting elastomer.
  • the polydimethylsiloxane elastomer consists of Si-0 polymer chains of different lengths with different organic groups: methyl groups and vinyl groups.
  • the high consistency polydimethylsiloxane elastomer reacts with vulcanizing additives for strengthening. This reaction is known as vulcanizing or curing of the silicone that usually takes place at room temperature.
  • vulcanizing or curing of the silicone that usually takes place at room temperature.
  • the vulcanization of silicones and the transformation to a solid elastomer, gel or flexible foam form part of the general knowledge of an expert in the field.
  • the mechanical properties of the composition are satisfactory for different uses: toys, decoration or molds for copying.
  • the composition of the present invention vulcanizes at room temperature with a 100% transformation of the composition into an elastic phase without the need to protect it from atmospheric conditions to slow curing or vulcanizing.
  • the vulcanization process of the composition of the invention can be accelerated by heat treatment at elevated temperature or by application of electromagnetic radiation.
  • the same composition presents the versatility of vulcanizing at different temperatures, so that the curing time can be adjusted to the manufacturing needs of the modeling parts.
  • the present invention provides a composition that allows modeling at room temperature similar to plasticine molding and subsequent vulcanization, where the composition can be modeled at room temperature as many times as desired without the need for temperature, followed by temperature vulcanization. ambient, high temperature or electromagnetic radiation.
  • Curing or vulcanizing is activated when the two components A and B are combined in a ratio substantially equal to 1: 1 (50% v / v, p / p).
  • Components A and B have been selected so that the curing or vulcanizing mode is neither too fast nor too slow, thus allowing the user enough time to model the two-component silicone composition after mixing component A with component B.
  • the modeling time by the user can be several hours, said time being able to be adjusted by modifying in the composition the percentages of curing agent in component A and the percentages of catalyst in component B.
  • both components A and B must contain the same ingredients with the exception of the curing agent and the catalyst, the pigments being able to be incorporated together either in the component carrying the Platinum catalyst or in the component that carries the curing agent or vulcanizing compound. It is also important that the catalyst and the curing agent are in different components.
  • component B includes pigments in order to provide end products, parts or objects of various colors.
  • the inventive composition of the invention consists of a binary mixture of component A and component B, in a ratio substantially close to 1: 1, wherein component A includes the following ingredients: 50-80% polydimethylsiloxane elastomer, reinforcing filler: pyrogenic silica and / or 15-25% precipitated silica, curing agent: 1 -5% polyhydrogenomethylsiloxane, where the percentages are expressed by weight with respect to the weight of component A and the sum of all ingredients in A does not exceed 100%, and component B includes the following ingredients: elastomer 50-80% polydimethylsiloxane, reinforcing filler: pyrogenic silica and / or 15-25% precipitated silica, platinum catalyst: 1-5% and pigments: up to 5%, where the percentages are expressed by weight with respect to the weight of the component B and the sum of all the ingredients of B does not exceed 100%.
  • component A includes the following ingredients: 50-80% polydimethylsiloxane elastomer
  • a ratio between components A and B substantially close to 1: 1 indicates a mixture of component A and component B in substantially equal parts that numerically corresponds to a ratio between 0.8: 1, 2 and 1 , 2: 0.8, preferably between 0.9: 1, 1 and 1, 1: 0.9, more preferably 1: 1.
  • Component A of the composition is transparent and includes the following ingredients:
  • polydimethylsiloxane elastomer preferably .50-80%
  • - reinforcing filler pyrogenic silica and / or precipitated silica 10-30%, preferably 15-25;
  • - curing agent 0.5-10% polyhydrogenomethylsiloxane, preferably 1-5%.
  • the high consistency is achieved by incorporating reinforcing fillers such as pyrogenic silica and / or precipitated silica into the elastomeric matrix of polydimethylsiloxane.
  • the reinforcing filler is selected from pyrogenic silica, precipitated silica or a combination thereof.
  • the curing agent is polyhydrogenomethylsiloxane.
  • Component B of the composition is transparent or colored when it contains pigments, and includes the following ingredients:
  • polydimethylsiloxane elastomer preferably 50-80%
  • - reinforcing filler pyrogenic silica and / or precipitated silica 10-30%, preferably 15-25;
  • the Williams plasticity test used here is carried out as follows: a sample with a cylindrical geometry and a thickness of approximately 15 mm, is compressed between two parallel plates exerting a pressure of 49 +/- 0.05 N, and The resulting height is measured when the pressure is stopped.
  • Component A, component B, and the bicomponent composition A + B before curing, that is, in its plastic phase, have a Mooney viscosity, measured according to DIN 53523/23 ° C, between 15 and 75 mPa s.
  • the Mooney viscosity test is a consolidated method for the characterization of uncured rubber materials. According to well-defined standardized procedures, the sample is preheated for a defined period, then cut at a constant rate. Mooney viscosity is recorded from the end of this deformation stage. The higher the Mooney viscosity, the lower the plasticity of the sample.
  • the two-component silicone elastomer composition is modelable at room temperature for a period of 5 hours. Curing materializes within 24-48 hours depending on the size of the modeled piece.
  • the two-component silicone elastomer composition is curable in hot air or by electromagnetic radiation.
  • the temperature of a conventional oven is suitable for curing in hot air, the temperature of the oven being at least 80 ° C, preferably in the range between 150 and 300 ° C. In hot air curing, the higher the temperature, the shorter the curing time.
  • a conventional domestic microwave is suitable for curing by electromagnetic radiation, where the power is between 500 and 2000 W.
  • the greater the power the less curing time.
  • the invention relates to the modeled product obtained from the composition according to the first aspect of the invention.
  • the product obtained withstands extreme temperatures, which include temperatures between -40 and +250 e C.
  • the modeled product obtained after curing stands out for being inert. It has excellent resistance to weathering and atmospheric agents, such as ozone, UV, salinity, humidity, etc., making it an ideal product for external use applications.
  • the product obtained is a non-toxic material and complies with the requirements and regulations that apply to the toy sector (DIN EN-71).
  • the modeled product obtained after curing has Shore hardness between 10 and 80 Sh A.
  • Shore hardness DIN 53505-A has been used at room temperature 23 ° C / on 6mm thick specimens.
  • Shore hardness is a measurement scale of the elastic hardness of materials, determined from the elastic reaction of the material when an object is dropped on it. During the non-destructive test, the height at which the projectile bounces is measured. This depends on the amount of energy absorbed by the test material during impact. Letter A in DIN 53505 indicates the type of durometer used in the test. A type A hardness tester is suitable for tests in the hardness range of 10 to 90 Shore A.
  • the invention relates to the use of the composition defined in the first aspect of the invention for the manufacture of products for recreational and / or educational use.
  • composition according to the first aspect of the invention is useful for the manufacture of molds, for example, molds for duplicating parts. It is also useful for manufacturing a final product, such as jewelry.
  • the molds obtained with the composition according to the first aspect of the invention are suitable for manufacturing or duplicating pieces or figures of different types of materials such as plaster, ice, polymer clay, wax, soap, resin, among others.
  • the mold obtained with the composition of the invention is even valid for use with low melting metals such as lead, zamak or pewter usually used in jewelry. Therefore, the invention also provides a finished product (mold), after curing, resistant to high temperatures, where this property of resistance to extreme temperatures does not depend on the method of curing, that is, this property does not depend on whether the mold manufactured it has been cured at room temperature, high temperature or by electromagnetic waves but it has its origin in the composition of the invention.
  • the inventive composition of the invention has good adhesive properties to other materials, especially porous materials such as plaster, wood, clays, etc.
  • the invention relates to a process for obtaining a moldable product from the composition defined in the first aspect of the invention characterized by the fact that it comprises the following steps:
  • iii) cure the product at room temperature in a period of time between 24-48 hours depending on size, or cure the product by application of hot air or electromagnetic radiation in minutes.
  • the curing stage by application of hot air includes a temperature above 80 ° C.
  • the curing stage by electromagnetic radiation includes a power between 500 and 2,000W.
  • the 100% transformation to the elastic phase (curing) will depend on the size of the piece or object modeled.
  • the bicomponent silicone elastomer composition of the invention has the versatility of facilitating the modeling of the product, the part or object, for a period of up to 5 hours, being able, if desired, to accelerate the curing at the time that the user You have finished modeling the part or object by using hot air in a conventional oven or by using electromagnetic radiation in a microwave conventional.
  • the piece or object cures at room temperature in a period between 24-48 hours.
  • the inventive composition of the invention can be molded in the same way, and the resulting product is elastic and durable, unlike plasticine.
  • the inventive composition has a greater range of colors, even transparent.
  • the product without curing or vulcanization being activated, using only component B (and its color variants). In this way the product does not vulcanize and its use resembles conventional plasticine. But with the advantage that it stains less, it does not harden or dry out, like conventional plasticine.
  • the inventive composition of the invention has a longer expiration period, since in contact with the air it does not dry out;
  • the inventive composition of the invention after vulcanization has superior elastic properties
  • the inventive composition of the invention is inert. It does not melt in contact with water, unlike polymeric clays drying at room temperature.
  • the inventive composition of the invention after vulcanization is elastic, unlike air-dried polymer clay that is rigid (non-elastic).
  • the inventive composition of the invention after vulcanization is elastic, this type of materials is not.
  • Bicomponent silicones to make molds have a very limited modeling time (they vulcanize very quickly) which does not allow to create figures.
  • inventive composition of the invention figures can be created, in addition to being used to make molds;
  • Figure 1 shows four photographs (a-d) of different custom created products obtained with the inventive composition of the invention.
  • Figure 2 shows a mold obtained with the inventive composition of the invention with the product duplicated with this mold.
  • Figure 3 shows a bicycle handlebar protector obtained with the inventive composition of the invention.
  • Figure 4 shows a plaster object glued using the inventive composition of the invention.
  • Example 1 Preparation of the two-component silicone elastomer composition
  • Component A 1 kg
  • Silicone elastomer (polydimethylsiloxane): 80%
  • Curing agent 5% polyhydrogenomethylsiloxane
  • Component B 1,200 kg, divided into several colors:
  • Silicone elastomer (polydimethylsiloxane): 80%
  • Silicone elastomer (polydimethylsiloxane): 80% Pyrogenic silica reinforcing load: 15%
  • Silicone elastomer (polydimethylsiloxane): 80%
  • Silicone elastomer (polydimethylsiloxane): 80%
  • Silicone elastomer (polydimethylsiloxane): 80%
  • Silicone elastomer (polydimethylsiloxane): 80%
  • component B the different colors available in component B.
  • the base colors are combined and mixed, since with these base colors (yellow, red and blue) in addition to white, black and transparent you can achieve a wide range of colors.
  • each sphere of each color of component B is mixed with the same amount of component A (1) : 1), the latter transparent, until a uniform color is obtained. As a result, spheres twice the size of each color are obtained.
  • the proportion of component A and B to be mixed must be approximately 1: 1, although it is not essential that this ratio be exact. It is not necessary to weigh each component A and B so that the weight ratio is 1: 1. Mixing approximately the same amount of component A with component B of similar sizes (measured by eye) is sufficient to obtain the effect of the invention.
  • the silicone composition of the invention is easily modeled, does not collapse, does not stain, does not smell. Colored silicones stick together, and can even be easily peeled off, which makes it easier to correct modeling errors.
  • Example 4 Mold making with the silicone composition of the invention
  • Component B (transparent) + component A (transparent) two portions of approximately the same size of each component are taken, and mixed with the hands. Once the mixture has been homogenized (transparent color), the figure to be copied is modeled and embedded. In this way the cavity is created, or negative in the silicone composition of the invention. In this case, the figure is a plastic crab. It is allowed to cure at room temperature. Within a period of 24 to 36 hours the silicone composition of the invention is already cured, and the plastic figure is removed. Once removed the plastic figure, already The mold ready to be used with many products (soaps, wax, polymer clay, etc.) is created (see Fig. 2).

Abstract

The invention relates to a two-part silicone elastomer composition that is curable at high and ambient temperatures, in which the silicone is high-consistency polydimethylsiloxane elastomer consisting of two parts, A and B, at a ratio close to 1:1, said two-part silicone elastomer composition having a pre-curing Mooney viscosity of between 15 and 7 mPa s and a post-curing Shore hardness of between 10 and 80 Sh A.

Description

COMPOSICIÓN ELASTOMÉRICA DE SILICONA BICOMPONENTE PARA MODELADO Campo de la invención  BICOMPONENT SILICONE ELASTOMERIC COMPOSITION FOR MODELING Field of the invention
La presente invención se refiere a una nueva composición elastomérica de silicona bicomponente para el modelado. Puede utilizarse para diversos propósitos, ya sea para la personalización de la forma de productos para uso lúdico, tanto doméstico como docente, así como para la obtención de moldes para duplicado o copia de objetos para uso industrial o artístico tanto en bisutería o Arts & Crafts.  The present invention relates to a new two component silicone elastomeric composition for modeling. It can be used for various purposes, either for the personalization of the form of products for recreational use, both domestic and for teaching, as well as for obtaining molds for duplicating or copying objects for industrial or artistic use in both jewelry and Arts & Crafts .
Antecedentes de la invención  Background of the invention
En el estado de la técnica son conocidas composiciones de silicona adecuadas para modelar y personalizar un diseño en un producto.  In the state of the art silicone compositions suitable for modeling and customizing a design in a product are known.
La patente ES2389759 divulga una composición de silicona curable en 24 horas a temperatura ambiente y humedad ambiental, que comprende polidimetilsiloxano, sílice pirogénica tratada con silano, silicato de magnesio, un agente reticulante de silano hidrolizable y una cantidad de un catalizador, preferiblemente un compuesto de estaño tal como el dilaurato de dibutilestaño. Se trata de una composición de un producto curable en superficie, de modo que bajo esta superficie, la composición todavía puede modelarse. Sin embargo, para frenar el curado y continuar con el moldeo en un momento posterior, el producto debe envasarse en envase hermético y al vacío. Todo el producto no envasado correctamente pierde la propiedad de modelarse en posterioridad y debe desperdiciarse.  Patent ES2389759 discloses a curable silicone composition in 24 hours at room temperature and ambient humidity, comprising polydimethylsiloxane, pyrogenic silica treated with silane, magnesium silicate, a hydrolysable silane crosslinking agent and an amount of a catalyst, preferably a compound of tin such as dibutyltin dilaurate. It is a composition of a surface curable product, so that under this surface, the composition can still be modeled. However, to stop curing and continue molding at a later time, the product must be packaged in airtight and vacuum packaging. All product not packaged properly loses the property of being modeled afterwards and must be wasted.
La patente CN101671482 describe una silicona bicomponente de curado a temperatura ambiente para la fabricación de juguetes de modelado manual. La silicona bicomponente está formada por un componente masilla y un componente catalizador, donde la relación entre ambos componentes es 1 :1 . Por una parte, el componente masilla comprende aceite de metil vinil silicona, un agente reticulante de la metil vinil silicona, un inhibidor, microesferas de baja densidad, un agente secuestrante de hidrógeno, un agente de liberación de molde, un plastificante y un agente de relleno. El inhibidor es un líquido de bajo peso molecular de tipo siloxano. Por otra parte, el componente catalizador comprende gel de sílice, un compuesto complejo de coordinación de metil vinil siloxano y platino, microesferas de baja densidad, un agente de liberación de molde, un plastificante y un agente de relleno. Sin embargo, el material descrito en CN101671482 no es curable a alta temperatura, por lo que dicha composición de silicona queda limitada a usos muy concretos. Patent CN101671482 describes a bicomponent silicone of room temperature curing for the manufacture of manual modeling toys. The bicomponent silicone is formed by a putty component and a catalyst component, where the ratio between both components is 1: 1. On the one hand, the putty component comprises methyl vinyl silicone oil, a methyl vinyl silicone crosslinking agent, an inhibitor, low density microspheres, a hydrogen sequestering agent, a mold releasing agent, a plasticizer and a filling. The inhibitor is a low molecular weight liquid of the siloxane type. On the other hand, the catalyst component comprises silica gel, a complex coordination compound of methyl vinyl siloxane and platinum, low density microspheres, a mold release agent, a plasticizer and a filler. However, the material described in CN101671482 is not curable at high temperature, whereby said silicone composition is limited to very specific uses.
En el estado de la técnica, también se han descrito materiales termoplásticos de curado a altas temperaturas, por ejemplo, mediante aire caliente o agua caliente, en donde el curado tiene lugar por evaporación del disolvente. Así, por ejemplo, la patente americana US5431563 divulga un artículo termoplástico para piezas de moldeo personalizables de dispositivos tales como placas dentales o agarraderas o equipos deportivos, en el que la composición termoplástica polimerizada mantiene su dureza tras la polimierización a temperaturas entorno a los 37eC y puede moldearse de forma conformable en repetidas ocasiones sólo cuando calienta entre aproximadamente 50eC y 95eC. La composición comprende un monómero líquido de metacrilato de metilo, un monómero líquido de metacrilato de butilo y una mezcla de plastificantes. Mezclándose dicha mezcla líquida con un polímero pulverizado de metacrilato de polietilo que se endurece, al menos sustancialmente, con temperaturas por debajo de 95eC, junto con un iniciador de polimerización, dicha composición polimeriza y puede volverse remoldeable en repetidas ocasiones cuando se calienta a temperaturas entre 50eC a 95eC. Sin embargo, la preparación de la composición termoplástica polimerizada es compleja y de difícil realización por parte de un usuario no experimentado, en especial la adecuada mezcla de cantidades de cada uno de los componentes, así como la correcta pulverización del polímero que integra la composición. In the state of the art, thermoplastic high temperature curing materials have also been described, for example, by hot air or hot water, where curing takes place by evaporation of the solvent. Thus, for example, the US patent US5431563 discloses a thermoplastic article for customizable molding parts of devices such as dental plates or handles or sports equipment, in which the polymerized thermoplastic composition maintains its hardness after polymerization at temperatures around 37 e C and can be molded repeatedly repeatedly when heated between about 50 e C and 95 e C. The composition comprises a liquid methyl methacrylate monomer, a liquid butyl methacrylate monomer and a mixture of plasticizers. By mixing said liquid mixture with a pulverized polymer of polyethyl methacrylate that hardens, at least substantially, with temperatures below 95 e C, together with a polymerization initiator, said composition polymerizes and can become repeatedly woven when heated to temperatures between 50 e C to 95 e C. However, the preparation of the polymerized thermoplastic composition is complex and difficult to carry out by an inexperienced user, especially the proper mixing of quantities of each of the components, as well as the correct spraying of the polymer that integrates the composition.
Por otro lado, la solicitud de patente internacional WO201425078 divulga una composición de arcilla para el modelado, que es curable con aire caliente. La composición de arcilla de modelado se prepara mezclando conjuntamente una silicona base en estado gelificado que se forma mezclando siloxano, silicona, grupo terminado de vinilo, metil vinilo, dimetilo, un regulador de la plasticidad hecho de un material en polvo a base de sílice para regular la dureza, un agente antiaglutinante oleoso hecho de un material polidimetilsiloxano para evitar el aglomerado, un agente antimicrobiano, y un agente de curado de platino. De nuevo, la propia naturaleza de los componentes de la composición representa un problema para el correcto mezclado por parte de un usuario no experimentado: silicona gelificada, material en polvo, antiaglutinante oleoso entre algunos de los componentes.  On the other hand, the international patent application WO201425078 discloses a clay composition for modeling, which is curable with hot air. The modeling clay composition is prepared by mixing together a base silicone in a gelled state that is formed by mixing siloxane, silicone, vinyl finished group, methyl vinyl, dimethyl, a plasticity regulator made of a silica-based powder material to regulate hardness, an oily anti-caking agent made of a polydimethylsiloxane material to prevent agglomerate, an antimicrobial agent, and a platinum curing agent. Again, the very nature of the components of the composition represents a problem for the correct mixing by an inexperienced user: gelled silicone, powder material, oily binder between some of the components.
Es de conocimiento general para un conocedor en la materia los tres tipos de tecnologías existentes para el curado o vulcanizado de siliconas: 1 ) reticulación en caliente, 2) reticulación a temperatura ambiente, y 3) curado por radiación UV.  The three types of technologies for curing or vulcanizing silicones are generally known to a person skilled in the art: 1) hot crosslinking, 2) crosslinking at room temperature, and 3) UV radiation curing.
La reticulación en caliente, de forma general, se lleva a cabo mediante peróxidos que generan radicales libres con una primera etapa de consolidación en molde a aproximadamente 125 ° C, seguido de una segunda etapa de post-curado para la eliminación de peróxidos, agua y pequeñas moléculas originadas, o bien mediante agentes endurecedores oligómeros polisiloxano con grupo lateral hidruro + catalizador de Pt, donde la reacción tiene lugar en aproximadamente 10-20 segundos a 175-190 °C y en les que la velocidad puede regularse con la presencia de inhibidores o retardadores en la composición. Hot crosslinking, in general, is carried out by peroxides that generate free radicals with a first mold consolidation stage at approximately 125 ° C, followed by a second post-curing stage for the removal of peroxides, water and small molecules originated, or by means of polysiloxane oligomer hardeners with hydride side group + Pt catalyst, where the reaction takes place in approximately 10-20 seconds at 175-190 ° C and in which the speed can be regulated with the presence of inhibitors or retarders in the composition.
La reticulación a temperatura ambiente de, forma general, se lleva a cabo mediante un mecanismo de condensación que se inicia por el vapor de agua del ambiente.  Cross-linking at room temperature in a general way is carried out by means of a condensation mechanism that is initiated by the ambient water vapor.
Y finalmente, el curado por radiación UV está limitado a piezas de pequeño espesor que no necesitan temperatura, ni humedad del ambiente.  And finally, UV radiation curing is limited to pieces of small thickness that do not need temperature, nor humidity of the environment.
Sin embargo, todavía no existe en el estado de la técnica una composición elastomérica de silicona de fácil preparación por parte de un usuario inexperimentado, con un tiempo de curado a temperatura ambiente suficientemente largo como para que el usuario pueda personalizar su diseño y modelarlo sin dificultad que al mismo tiempo sea adecuada para curar a temperatura ambiente, a elevada temperatura o por efecto de ondas electromagnáticas. However, an elastomeric silicone composition of easy preparation by an inexperienced user does not yet exist in the state of the art, with a curing time at room temperature long enough for the user to customize his design and model it without difficulty. that at the same time is suitable to cure at room temperature, at high temperature or by the effect of electromagnetic waves.
Descripción de la invención Description of the invention
La presente invención se ha realizado a la vista del estado de la técnica descrito más arriba. El objeto de la presente invención es proporcionar una composición elastomérica de silicona que posea un tiempo de curado suficientemente largo como para que un usuario pueda modelar el diseño de un producto a temperatura ambiente, pueda prepararse de forma fácil, segura y eficaz por cualquier usuario inexperto como, por ejemplo, un niño, que además sea adecuada para curar a temperatura ambiente, a elevada temperatura o por radiación electromagnética y soporte temperaturas extremas.  The present invention has been made in view of the state of the art described above. The object of the present invention is to provide an elastomeric silicone composition that has a sufficiently long curing time so that a user can model the design of a product at room temperature, can be prepared easily, safely and efficiently by any inexperienced user. as, for example, a child, which is also suitable to cure at room temperature, at high temperature or by electromagnetic radiation and support extreme temperatures.
La composición elastomérica de silicona de la invención es versátil en cuanto al curado de la composición. Además, el producto modelado con la misma presenta propiedades mejoradas que la hacen útil para diferentes aplicaciones tanto lúdicas como industriales.  The elastomeric silicone composition of the invention is versatile in terms of curing the composition. In addition, the product modeled with it has improved properties that make it useful for different recreational and industrial applications.
La composición elastomérica de la invención resuelve los inconvenientes del estado de la técnica, presentando además otras ventajas que se describirán a continuación.  The elastomeric composition of the invention solves the drawbacks of the state of the art, also presenting other advantages that will be described below.
La composición elastomérica de silicona bicomponente se caracteriza por el hecho de que comprende elastomero de polidimetilsiloxano de alta consistencia y por el hecho de que la composición es una mezcla binaria de un componente A y un componente B, siendo la relación entre el componente A y el componente B sustancialmente próxima a 1 :1 ,  The two component silicone elastomeric composition is characterized by the fact that it comprises high consistency polydimethylsiloxane elastomer and by the fact that the composition is a binary mixture of a component A and a component B, the ratio between component A and component B substantially close to 1: 1,
Donde:  Where:
- el componente A incluye los siguientes ingredientes: elastomero de polidimetilsiloxano 40- 85%, carga reforzante tal como sílice pirogénica y/o sílice precipitada 10-30%, agente de curado: polihidrógenometilsiloxano y 0,5-10%, estando los porcentajes expresados en peso con respecto al peso del componente A, con la condición que la suma de todos los componentes no supere el 100%, y - component A includes the following ingredients: 40-85% polydimethylsiloxane elastomer, reinforcing filler such as pyrogenic silica and / or 10-30% precipitated silica, curing agent: polyhydrogenomethylsiloxane and 0.5-10%, the percentages being expressed in weight with respect to the weight of component A, with the condition that the sum of all components do not exceed 100%, and
- el componente B incluye los siguientes ingredientes: elastomero de polidimetilsiloxano 40- 85%, carga reforzante tal como sílice pirogénica y/o sílice precipitada 10-30%, catalizador de platino: 1 -8% y pigmentos: hasta 5%, estando los porcentajes expresados en peso con respecto al peso del componente B, con la condición que la suma de todos los componentes no supere el 100%.  - Component B includes the following ingredients: 40-85% polydimethylsiloxane elastomer, reinforcing filler such as pyrogenic silica and / or 10-30% precipitated silica, platinum catalyst: 1-8% and pigments: up to 5%, being the percentages expressed in weight with respect to the weight of component B, with the proviso that the sum of all components does not exceed 100%.
Por "elevada temperatura" en la presente invención se entiende una temperatura superior a 80 °C, preferiblemente comprendida entre 150 y 300 °C La composición elastomérica de silicona bicomponente mezclada a partes sustancialmente iguales de sus dos componentes A y B presenta una viscosidad Mooney antes del curado comprendida entre 15 y 75 mPa s y una dureza Shore después del curado comprendida entre 10 y 80 Sh A.  By "high temperature" in the present invention is meant a temperature greater than 80 ° C, preferably comprised between 150 and 300 ° C. The two-component silicone elastomeric composition mixed with substantially equal parts of its two components A and B has a Mooney viscosity before of curing between 15 and 75 mPa s and a Shore hardness after curing between 10 and 80 Sh A.
La silicona seleccionada en la composición de la presente invención es "elastomero de polidimetilsiloxano de alta consistencia", que se presenta en forma de pasta moldeable de polidimetilsiloxano, donde "de alta consistencia" indica que al elastomero polidimetilsiloxano incluye cargas reforzantes tal como la sílice pirogénica y/o sílice precipitada que proporcionan dicha "alta consistencia" al elastomero resultante. El elastomero de polidimetilsiloxano consta de cadenas poliméricas de Si-0 de diferentes longitudes con diferentes grupos orgánicos: grupos metilo y grupos vinilo.  The silicone selected in the composition of the present invention is "high consistency polydimethylsiloxane elastomer", which is presented in the form of a moldable polydimethylsiloxane paste, where "high consistency" indicates that the polydimethylsiloxane elastomer includes reinforcing fillers such as pyrogenic silica and / or precipitated silica that provide said "high consistency" to the resulting elastomer. The polydimethylsiloxane elastomer consists of Si-0 polymer chains of different lengths with different organic groups: methyl groups and vinyl groups.
El elastomero de polidimetilsiloxano de alta consistencia reacciona con aditivos vulcanizantes para fortalecimiento. Esta reacción se conoce con el nombre de vulcanizado o curado de la silicona que habitualmente tiene lugar a temperatura ambiente. Forma parte del conocimiento general de un experto en la materia la vulcanización de siliconas y la transformación a un elastomero sólido, gel o espuma flexible. Las propiedades mecánicas de la composición son satisfactorias para distintos usos: juguetes, decoración o moldes para copia.  The high consistency polydimethylsiloxane elastomer reacts with vulcanizing additives for strengthening. This reaction is known as vulcanizing or curing of the silicone that usually takes place at room temperature. The vulcanization of silicones and the transformation to a solid elastomer, gel or flexible foam form part of the general knowledge of an expert in the field. The mechanical properties of the composition are satisfactory for different uses: toys, decoration or molds for copying.
Sorprendentemente, la composición de la presente invención vulcaniza a temperatura ambiente con una transformación del 100% de la composición a fase elástica sin necesidad de protegerla de las condiciones atmosféricas para ralentizar el curado o vulcanizado. Surprisingly, the composition of the present invention vulcanizes at room temperature with a 100% transformation of the composition into an elastic phase without the need to protect it from atmospheric conditions to slow curing or vulcanizing.
Ventajosamente, si se desea, el proceso de vulcanización de la composición de la invención puede acelerarse mediante tratamiento térmico a temperatura elevada o por aplicación de radiación electromagnética. La misma composición presenta la versatilidad de vulcanizar a distintas temperaturas con lo que el tiempo de curado puede ajustarse a las necesidades de fabricación de las piezas de modelado.  Advantageously, if desired, the vulcanization process of the composition of the invention can be accelerated by heat treatment at elevated temperature or by application of electromagnetic radiation. The same composition presents the versatility of vulcanizing at different temperatures, so that the curing time can be adjusted to the manufacturing needs of the modeling parts.
Hasta la fecha, se han descrito composiciones de vulcanizado a temperatura ambiente y composiciones de vulcanizado a temperatura elevada, ambas con sus respectivos inconvenientes. To date, vulcanizing compositions have been described at room temperature and high temperature vulcanizing compositions, both with their respective drawbacks.
Por el contrario, la presente invención proporciona una composición que permite el modelado a temperatura ambiente similar al moldeado de la plastilina y vulcanización posterior, donde la composición puede modelarse a temperatura ambiente tantas veces como se desee sin necesidad de temperatura, seguido de vulcanización a temperatura ambiente, temperatura elevada o radiación electromagnética.  On the contrary, the present invention provides a composition that allows modeling at room temperature similar to plasticine molding and subsequent vulcanization, where the composition can be modeled at room temperature as many times as desired without the need for temperature, followed by temperature vulcanization. ambient, high temperature or electromagnetic radiation.
El curado o vulcanizado se activa cuando se juntan los dos componentes A y B en una relación sustancialmente igual a 1 :1 (al 50% v/v, p/p). Los componentes A y B se han seleccionado para que el modo de curado o vulcanizado no sea ni demasiado rápido, ni demasiado lento, teniendo así el usuario el tiempo suficiente para modelar la composición bicomponente de silicona tras mezclar el componente A con el componente B.  Curing or vulcanizing is activated when the two components A and B are combined in a ratio substantially equal to 1: 1 (50% v / v, p / p). Components A and B have been selected so that the curing or vulcanizing mode is neither too fast nor too slow, thus allowing the user enough time to model the two-component silicone composition after mixing component A with component B.
Ventajosamente, el tiempo de modelado por parte del usuario puede ser de varias horas, pudiéndose ajustar dicho tiempo modificando en la composición los porcentajes de agente de curado en el componente A y los porcentajes de catalizador en el componente B. A mayor porcentaje de agente de curado y de catalizador, dentro de los rangos descritos más arriba, menor tiempo de curado o vulcanización tras mezclar los dos componentes A y B de la composición inventiva de la invención.  Advantageously, the modeling time by the user can be several hours, said time being able to be adjusted by modifying in the composition the percentages of curing agent in component A and the percentages of catalyst in component B. The higher the percentage of Curing and catalyst, within the ranges described above, less cure or vulcanization time after mixing the two components A and B of the inventive composition of the invention.
Los autores de la presente invención han encontrado que para obtener la composición inventiva de la invención ambos componentes A y B deben contener los mismos ingredientes a excepción del agente de curado y del catalizador, pudiéndose incorporar los pigmentos conjuntamente bien sea en el componente que lleva el catalizador de platino o bien sea en el componente que lleva el agente de curado o compuesto vulcanizante. Así mismo es importante que el catalizador y el agente de curado estén en componentes distintos.  The authors of the present invention have found that to obtain the inventive composition of the invention both components A and B must contain the same ingredients with the exception of the curing agent and the catalyst, the pigments being able to be incorporated together either in the component carrying the Platinum catalyst or in the component that carries the curing agent or vulcanizing compound. It is also important that the catalyst and the curing agent are in different components.
En una realización, el componente B incluye pigmentos al objeto de proporcionar productos, piezas u objetos finales de colores diversos. In one embodiment, component B includes pigments in order to provide end products, parts or objects of various colors.
En otra realización, la composición inventiva de la invención consiste en una mezcla binaria del componente A y el componente B, en una relación sustancialmente próxima a 1 :1 , donde el componente A incluye los siguientes ingredientes: elastómero de polidimetilsiloxano 50- 80%, carga reforzante: sílice pirogénica y/o sílice precipitada 15-25%, agente de curado: polihidrógenometilsiloxano 1 -5%, donde los porcentajes están expresados en peso con respecto al peso del componente A y la suma de todos los ingredientes de A no supera el 100%, y el componente B incluye los siguientes ingredientes: elastómero de polidimetilsiloxano 50-80%, carga reforzante: sílice pirogénica y/o sílice precipitada 15-25%, catalizador de platino: 1 -5% y pigmentos: hasta el 5%, donde los porcentajes están expresados en peso con respecto al peso del componente B y la suma de todos los ingredientes de B no supera el 100%. In another embodiment, the inventive composition of the invention consists of a binary mixture of component A and component B, in a ratio substantially close to 1: 1, wherein component A includes the following ingredients: 50-80% polydimethylsiloxane elastomer, reinforcing filler: pyrogenic silica and / or 15-25% precipitated silica, curing agent: 1 -5% polyhydrogenomethylsiloxane, where the percentages are expressed by weight with respect to the weight of component A and the sum of all ingredients in A does not exceed 100%, and component B includes the following ingredients: elastomer 50-80% polydimethylsiloxane, reinforcing filler: pyrogenic silica and / or 15-25% precipitated silica, platinum catalyst: 1-5% and pigments: up to 5%, where the percentages are expressed by weight with respect to the weight of the component B and the sum of all the ingredients of B does not exceed 100%.
En la presente invención, una relación entre los componentes A y B sustancialmente próxima a 1 :1 indica una mezcla de componente A y componente B a partes sustancialmente iguales que numéricamente se corresponde con una relación comprendida entre 0,8:1 ,2 y 1 ,2:0,8, preferiblemente comprendida entre 0,9:1 ,1 y 1 ,1 :0,9, más preferiblemente de 1 :1 . In the present invention, a ratio between components A and B substantially close to 1: 1 indicates a mixture of component A and component B in substantially equal parts that numerically corresponds to a ratio between 0.8: 1, 2 and 1 , 2: 0.8, preferably between 0.9: 1, 1 and 1, 1: 0.9, more preferably 1: 1.
El componente A de la composición es transparente e incluye los siguientes ingredientes:  Component A of the composition is transparent and includes the following ingredients:
- elastómero de polidimetilsiloxano 40-85%, preferiblemente .50-80%;  - 40-85% polydimethylsiloxane elastomer, preferably .50-80%;
- carga reforzante: sílice pirogénica y/o sílice precipitada 10-30%, preferiblemente 15- 25;  - reinforcing filler: pyrogenic silica and / or precipitated silica 10-30%, preferably 15-25;
- agente de curado: polihidrógenometilsiloxano 0,5-10%, preferiblemente 1 -5%.  - curing agent: 0.5-10% polyhydrogenomethylsiloxane, preferably 1-5%.
La alta consistencia se consigue mediante la incorporación de cargas reforzantes como la sílice pirogénica y/o sílice precipitada a la matriz elastómerica de polidimetilsiloxano.  The high consistency is achieved by incorporating reinforcing fillers such as pyrogenic silica and / or precipitated silica into the elastomeric matrix of polydimethylsiloxane.
La carga reforzante se selecciona entre sílice pirogénica, sílice precipitada o una combinación de las mismas. El agente de curado es polihidrógenometilsiloxano.  The reinforcing filler is selected from pyrogenic silica, precipitated silica or a combination thereof. The curing agent is polyhydrogenomethylsiloxane.
El componente B de la composición es transparente o coloreado cuando contiene pigmentos, e incluye los siguientes ingredientes:  Component B of the composition is transparent or colored when it contains pigments, and includes the following ingredients:
- elastómero de polidimetilsiloxano 40-85%, preferiblemente 50-80%;  - 40-85% polydimethylsiloxane elastomer, preferably 50-80%;
- carga reforzante: sílice pirogénica y/o sílice precipitada 10-30%, preferiblemente 15- 25;  - reinforcing filler: pyrogenic silica and / or precipitated silica 10-30%, preferably 15-25;
- catalizador de platino: 1 -8%, preferiblemente 1 -5%. y  - Platinum catalyst: 1-8%, preferably 1-5%. Y
- pigmentos: hasta 5%.  - pigments: up to 5%.
El componente A, el componente B, y la composición bicomponente A+B antes de curar, es decir en su fase plástica, presentan una plasticidad Williams, medida según la norma ASTM D926, comprendida entre 100 y 800 mm. La plasticidad, medida según ASTM D926 con un plastíimetro de Williams, debe estar comprendida entre 100 y 800 mm. Estos valores significan la altura de recuperación de la muestra dentro de un tiempo determinado al dejar de aplicar una fuerza de compresión con un Plastometro de láminas paralelas, donde esta altura se multiplica por 100. El test de plasticidad Williams aquí utilizado se lleva a cabo de la siguiente manera: una muestra con una geometría cilindrica y un espesor de aproximadamente 15 mm, se comprime entre dos platos paralelos ejerciendo una presión de 49 +/-0,05 N, y se mide la altura resultante al dejar de ejercer la presión. Component A, component B, and the bicomponent composition A + B before curing, that is, in its plastic phase, have a Williams plasticity, measured according to ASTM D926, between 100 and 800 mm. The plasticity, measured according to ASTM D926 with a Williams plastimeter, must be between 100 and 800 mm. These values mean the height of recovery of the sample within a certain time to stop applying a compression force with a Plastometer parallel plates, where this height is multiplied by 100. The Williams plasticity test used here is carried out as follows: a sample with a cylindrical geometry and a thickness of approximately 15 mm, is compressed between two parallel plates exerting a pressure of 49 +/- 0.05 N, and The resulting height is measured when the pressure is stopped.
El componente A, el componente B, y la composición bicomponente A+B antes de curar, es decir en su fase plástica, presentan una viscosidad Mooney, medida según la norma DIN 53523/23 °C, comprendida entre 15 y 75 mPa s. Component A, component B, and the bicomponent composition A + B before curing, that is, in its plastic phase, have a Mooney viscosity, measured according to DIN 53523/23 ° C, between 15 and 75 mPa s.
La prueba de viscosidad de Mooney es un método consolidado para la caracterización de materiales de caucho no curado. De acuerdo con procedimientos estandarizados bien definidos, se precalienta la muestra durante un período definido, luego se corta a una velocidad constante. La viscosidad de Mooney se registra desde el final de esta etapa de deformación. Cuanto mayor es la viscosidad Mooney, menor es la plasticidad de la muestra. The Mooney viscosity test is a consolidated method for the characterization of uncured rubber materials. According to well-defined standardized procedures, the sample is preheated for a defined period, then cut at a constant rate. Mooney viscosity is recorded from the end of this deformation stage. The higher the Mooney viscosity, the lower the plasticity of the sample.
En una realización, la composición de elastómero de silicona bicomponente es modelable a temperatura ambiente durante un periodo de tiempo de 5 horas. El curado se materializa en un plazo de 24-48 horas en función del tamaño de la pieza modelada. In one embodiment, the two-component silicone elastomer composition is modelable at room temperature for a period of 5 hours. Curing materializes within 24-48 hours depending on the size of the modeled piece.
En otra realización alternativa, la composición de elastómero de silicona bicomponente es curable en aire caliente o por radiación electromagnética. La temperatura de un horno convencional es adecuada para realizar el curado en aire caliente, estando la temperatura del horno al menos a 80 °C, preferiblemente en el rango comprendido entre 150 y 300 °C. En el curado por aire caliente, a mayor temperatura menor tiempo de curado.  In another alternative embodiment, the two-component silicone elastomer composition is curable in hot air or by electromagnetic radiation. The temperature of a conventional oven is suitable for curing in hot air, the temperature of the oven being at least 80 ° C, preferably in the range between 150 and 300 ° C. In hot air curing, the higher the temperature, the shorter the curing time.
El uso de un microondas doméstico convencional es adecuado para el curado por radiación electromagnética, donde la potencia está comprendida entre 500 y 2000 W. En el curado por radiación electromagnética, a mayor potencia menor tiempo de curado.  The use of a conventional domestic microwave is suitable for curing by electromagnetic radiation, where the power is between 500 and 2000 W. In curing by electromagnetic radiation, the greater the power, the less curing time.
En un segundo aspecto, la invención se refiere al producto modelado obtenido a partir de la composición de acuerdo con el primer aspecto de la invención.  In a second aspect, the invention relates to the modeled product obtained from the composition according to the first aspect of the invention.
Sorprendentemente, el producto obtenido soporta temperaturas extremas, que incluyen temperaturas comprendidas entre -40 y +250eC. Surprisingly, the product obtained withstands extreme temperatures, which include temperatures between -40 and +250 e C.
El producto modelado obtenido después del curado destaca por ser inerte. Posee una excelente resistencia a la intemperie y a los agentes atmosféricos, tal como ozono, UV, salinidad, humedad, etc, por lo que es un producto ideal para aplicaciones de uso externo. The modeled product obtained after curing stands out for being inert. It has excellent resistance to weathering and atmospheric agents, such as ozone, UV, salinity, humidity, etc., making it an ideal product for external use applications.
Ventajosamente, el producto obtenido es un material atóxico y cumple con los requisitos y normativas que aplican al sector del juguete (Norma DIN EN-71 ). El producto modelado obtenido después del curado presenta dureza Shore comprendida entre 10 y 80 Sh A. Para la determinación de la dureza se ha empleado la norma DIN 53505-A a temperatura ambiente 23°C/sobre probetas de 6mm deespesor. Advantageously, the product obtained is a non-toxic material and complies with the requirements and regulations that apply to the toy sector (DIN EN-71). The modeled product obtained after curing has Shore hardness between 10 and 80 Sh A. For the determination of hardness DIN 53505-A has been used at room temperature 23 ° C / on 6mm thick specimens.
La dureza Shore es una escala de medida de la dureza elástica de los materiales, determinada a partir de la reacción elástica del material cuando se deja caer sobre él un objeto. Durante el ensayo, no destructivo, se mide la altura a la que rebota el proyectil. Ésta depende de la cantidad de energía absorbida por el material de ensayo durante el impacto. La letra A en la norma DIN 53505 indica el tipo de durómetro empleado en el ensayo. Un durómetro tipo A es adecuado para pruebas en el rango de durezas de 10 a 90 Shore A.  Shore hardness is a measurement scale of the elastic hardness of materials, determined from the elastic reaction of the material when an object is dropped on it. During the non-destructive test, the height at which the projectile bounces is measured. This depends on the amount of energy absorbed by the test material during impact. Letter A in DIN 53505 indicates the type of durometer used in the test. A type A hardness tester is suitable for tests in the hardness range of 10 to 90 Shore A.
Así pues, en un tercer aspecto, la invención se refiere al uso de la composición definida en el primer aspecto de la invención para la fabricación de productos para uso lúdico y/o docente.Thus, in a third aspect, the invention relates to the use of the composition defined in the first aspect of the invention for the manufacture of products for recreational and / or educational use.
En un tercer aspecto, la composición de acuerdo con el primer aspecto de la invención es útil para la fabricación de moldes, por ejemplo, moldes para duplicar piezas. Es igualmente útil para fabricar un producto final como, por ejemplo, bisutería. In a third aspect, the composition according to the first aspect of the invention is useful for the manufacture of molds, for example, molds for duplicating parts. It is also useful for manufacturing a final product, such as jewelry.
Ventajosamente, los moldes obtenidos con la composición según el primer aspecto de la invención son adecuados para fabricar o duplicar piezas o figuras de distintos tipos de materiales tales como yeso, hielo, arcilla polimérica, cera, jabón, resina, entre otros. El molde obtenido con la composición de la invención incluso es válido para utilizar con metales de bajo punto de fusión como el plomo, zamak o peltre habitualmente empleados en bisutería. Por lo tanto, la invención proporciona además un producto acabado (molde), después de curado, resistente a elevadas temperaturas, donde esta propiedad de resistencia a temperaturas extremas no depende del método de curado, es decir, esta propiedad no depende de si el molde fabricado se ha curado a temperatura ambiente, temperatura elevada o por ondas electromagnéticas sino que tiene su origen en la composición de la invención. Advantageously, the molds obtained with the composition according to the first aspect of the invention are suitable for manufacturing or duplicating pieces or figures of different types of materials such as plaster, ice, polymer clay, wax, soap, resin, among others. The mold obtained with the composition of the invention is even valid for use with low melting metals such as lead, zamak or pewter usually used in jewelry. Therefore, the invention also provides a finished product (mold), after curing, resistant to high temperatures, where this property of resistance to extreme temperatures does not depend on the method of curing, that is, this property does not depend on whether the mold manufactured it has been cured at room temperature, high temperature or by electromagnetic waves but it has its origin in the composition of the invention.
Ventajosamente, la composición inventiva de la invención posee buenas propiedades adhesivas a otros materiales, en especial a materiales porosos tal como la escayola, madera, arcillas, etc. Advantageously, the inventive composition of the invention has good adhesive properties to other materials, especially porous materials such as plaster, wood, clays, etc.
En un cuarto aspecto, la invención se refiere a un procedimiento para obtener un producto moldeable a partir de la composición definida en el primer aspecto de la invención que se caracteriza por el hecho de que comprende las siguientes etapas:  In a fourth aspect, the invention relates to a process for obtaining a moldable product from the composition defined in the first aspect of the invention characterized by the fact that it comprises the following steps:
i) mezclar una parte del componente A con otra parte del componente B a partes substancialmente iguales;  i) mixing a part of component A with another part of component B to substantially equal parts;
ii) modelar en condiciones de presión y temperatura ambientales, donde la etapa de modelado dispone de un periodo de hasta 5 horas; y ii) modeling under ambient pressure and temperature conditions, where the stage of modeling has a period of up to 5 hours; Y
iii) curar el producto a temperatura ambiente en un periodo de tiempo comprendido entre 24-48 horas según tamaño, o curar el producto por aplicación de aire caliente o radiación electromagnética en minutos. La etapa de curado por aplicación de aire caliente incluye una temperatura superior a 80°C.  iii) cure the product at room temperature in a period of time between 24-48 hours depending on size, or cure the product by application of hot air or electromagnetic radiation in minutes. The curing stage by application of hot air includes a temperature above 80 ° C.
La etapa de curado por radiación electromagnética incluye una potencia comprendida entre 500 y 2.000W. The curing stage by electromagnetic radiation includes a power between 500 and 2,000W.
La transformación al 100% a la fase elástica (curado) dependerá del tamaño de la pieza u objeto modelado.  The 100% transformation to the elastic phase (curing) will depend on the size of the piece or object modeled.
La mezcla de una parte del componente A con otra parte del componente B, a partes substancialmente iguales, inicia la reacción que se representa a continuación: Mixing one part of component A with another part of component B, at substantially equal parts, initiates the reaction shown below:
Figure imgf000010_0001
Figure imgf000010_0001
Ventajosamente, la composición de elastomero de silicona bicomponente de la invención presenta la versatilidad de facilitar el modelado del producto, la pieza u objeto, durante un período de hasta 5 horas, pudiéndose, si se desea, acelerar el curado en el momento que el usuario haya finalizado el modelado de la pieza u objeto mediante el uso de aire caliente en un horno convencional o mediante el uso de radiación electromagnética en un microondas convencional. Alternativamente, la pieza u objeto cura a temperatura ambiente en un periodo comprendido entre 24-48 horas. Advantageously, the bicomponent silicone elastomer composition of the invention has the versatility of facilitating the modeling of the product, the part or object, for a period of up to 5 hours, being able, if desired, to accelerate the curing at the time that the user You have finished modeling the part or object by using hot air in a conventional oven or by using electromagnetic radiation in a microwave conventional. Alternatively, the piece or object cures at room temperature in a period between 24-48 hours.
La composición de silicona bicomponente de la invención presenta las siguientes ventajas con respecto a los productos existentes en el estado de la técnica:  The bicomponent silicone composition of the invention has the following advantages over products existing in the state of the art:
Respecto a la plastilina: la composición inventiva de la invención puede moldearse de la misma manera, y el producto resultante es elástico y duradero, a diferencia de la plastilina. La composición inventiva tiene una mayor gama de colores, incluso transparentes. With respect to plasticine: the inventive composition of the invention can be molded in the same way, and the resulting product is elastic and durable, unlike plasticine. The inventive composition has a greater range of colors, even transparent.
Si se prefiere, es posible también utilizar el producto sin que se active el curado o vulcanización, utilizando únicamente el componente B (y sus variantes de color). De esta manera el producto no vulcaniza y su uso se asemeja a la plastilina convencional. Pero con la ventaja de que mancha menos, no endurece, ni se reseca, como la plastilina convencional. If preferred, it is also possible to use the product without curing or vulcanization being activated, using only component B (and its color variants). In this way the product does not vulcanize and its use resembles conventional plasticine. But with the advantage that it stains less, it does not harden or dry out, like conventional plasticine.
Respecto a la arcilla polimérica de secado a temperatura ambiente: Regarding polymer clay drying at room temperature:
Más fácil de modelar, no colapsa a diferencia de las arcillas poliméricas de secado a temperatura ambiente;  Easier to model, it does not collapse unlike polymeric clays drying at room temperature;
Tiene una gama más amplia de colores, más vivos, con posibilidad de obtener el color transparente; It has a wider range of colors, more vivid, with the possibility of obtaining the transparent color;
Caducidad: la composición inventiva de la invención tiene un período de caducidad superior, ya que en contacto con el aire no se seca;  Expiration: the inventive composition of the invention has a longer expiration period, since in contact with the air it does not dry out;
La composición inventiva de la invención tras la vulcanización tiene propiedades elásticas superiores;  The inventive composition of the invention after vulcanization has superior elastic properties;
La composición inventiva de la invención es inerte. No se deshace en contacto con el agua, a diferencia de las arcillas poliméricas de secado a temperatura ambiente.  The inventive composition of the invention is inert. It does not melt in contact with water, unlike polymeric clays drying at room temperature.
Respecto a la arcilla polimérica de secado a alta temperatura:  Regarding high temperature drying polymer clay:
La composición inventiva de la invención tras la vulcanización es elástica, a diferencia de la arcilla polimérica de secado al aire que rígido (no elástico).  The inventive composition of the invention after vulcanization is elastic, unlike air-dried polymer clay that is rigid (non-elastic).
Respecto a arcilla, veso, porcelana:  Regarding clay, veso, porcelain:
La composición inventiva de la invención tras la vulcanización es elástica, este tipo de materiales no.  The inventive composition of the invention after vulcanization is elastic, this type of materials is not.
Respecto a siliconas bicomponetes para fabricar moldes:  Regarding silicones bicomponetes to manufacture molds:
Las siliconas bicomponentes para fabricar moldes tienen un tiempo de modelado muy limitado (vulcanizan muy rápidamente) lo que no permite crear figuras. Con la composición inventiva de la invención sí pueden crearse figuras, además de que puede utilizarse para fabricar moldes; Bicomponent silicones to make molds have a very limited modeling time (they vulcanize very quickly) which does not allow to create figures. With the inventive composition of the invention figures can be created, in addition to being used to make molds;
Breve descripción de las figuras  Brief description of the figures
Para mejor comprensión de cuanto se ha expuesto se acompañan unas figuras en las que, esquemáticamente y tan sólo a título de ejemplo no limitativo, se representa un caso práctico de realización. For a better understanding of how much has been exposed, some figures are attached in which, schematically and only by way of non-limiting example, a practical case of embodiment is represented.
La figura 1 es muestra cuatro fotografías (a - d) de distintos productos de creación personalizada obtenidos con la composición inventiva de la invención.  Figure 1 shows four photographs (a-d) of different custom created products obtained with the inventive composition of the invention.
La figura 2 muestra un molde obtenido con la composición inventiva de la invención con el producto duplicado con este molde. Figure 2 shows a mold obtained with the inventive composition of the invention with the product duplicated with this mold.
La figura 3 muestra un protector de manillar de bicicleta obtenido con la composición inventiva de la invención.  Figure 3 shows a bicycle handlebar protector obtained with the inventive composition of the invention.
La figura 4 muestra un objeto de escayola pegado empleando la composición inventiva de la invención.  Figure 4 shows a plaster object glued using the inventive composition of the invention.
Ejemplos  Examples
Ejemplo 1 : Preparación de la composición de elastómero de silicona bicomponente  Example 1: Preparation of the two-component silicone elastomer composition
Componente A: 1 kg Component A: 1 kg
Elastómero de silicona (polidimetisiloxano): 80%  Silicone elastomer (polydimethylsiloxane): 80%
Carga reforzante: sílice pirogénica: 15% Reinforcement load: pyrogenic silica: 15%
Agente de curado: polihidrógenometilsiloxano 5%  Curing agent: 5% polyhydrogenomethylsiloxane
Componente B: 1 .200 kg, divididos en varios colores: Component B: 1,200 kg, divided into several colors:
- Color rojo, preparación de 200 gramos  - Red color, preparation of 200 grams
Elastómero de silicona (polidimetilsiloxano): 80% Silicone elastomer (polydimethylsiloxane): 80%
Carga reforzante: sílice pirogénica: 15% Reinforcement load: pyrogenic silica: 15%
Catalizador de platino: 4% Platinum Catalyst: 4%
Pigmento rojo: 1 % Red Pigment: 1%
- Color amarillo, preparación de 200 gramos  - Yellow color, preparation of 200 grams
Elastómero de silicona (polidimetilsiloxano): 80% Carga reforzante sílice pirogénica: 15% Silicone elastomer (polydimethylsiloxane): 80% Pyrogenic silica reinforcing load: 15%
Catalizador de platino: 4% Platinum Catalyst: 4%
Pigmento amarillo: 1 % Yellow Pigment: 1%
- Color azul, preparación de 200 gramos  - Blue color, preparation of 200 grams
Elastómero de silicona (polidimetilsiloxano): 80% Silicone elastomer (polydimethylsiloxane): 80%
Carga reforzante: sílice pirogénica: 15% Reinforcement load: pyrogenic silica: 15%
Catalizador de platino: 4% Platinum Catalyst: 4%
Pigmento azul: 1 % Blue Pigment: 1%
- Color transparente, preparación de 200 gramos  - Transparent color, preparation of 200 grams
Elastómero de silicona (polidimetilsiloxano): 80% Silicone elastomer (polydimethylsiloxane): 80%
Carga reforzante: sílice pirogénica: 15%  Reinforcement load: pyrogenic silica: 15%
Catalizador de platino: 4% Platinum Catalyst: 4%
- Color blanco, preparación de 200 gramos  - White color, preparation of 200 grams
Elastómero de silicona (polidimetilsiloxano): 80% Silicone elastomer (polydimethylsiloxane): 80%
Carga reforzante: sílice pirogénica: 15% Reinforcement load: pyrogenic silica: 15%
Catalizador de platino: 4% Platinum Catalyst: 4%
Pigmento blanco: 1 % White Pigment: 1%
- Color negro, preparación de 200 gramos  - Black color, preparation of 200 grams
Elastómero de silicona (polidimetilsiloxano): 80% Silicone elastomer (polydimethylsiloxane): 80%
Carga reforzante: sílice pirogénica: 15% Reinforcement load: pyrogenic silica: 15%
Catalizador de platino: 4% Platinum Catalyst: 4%
Pigmento negro: 1 % Black Pigment: 1%
Ejemplo 2: Elaboración de figuras en forma de la oveja shawn  Example 2: Elaboration of figures in the form of the shawn sheep
Primeramente se trabaja con los distintos colores disponibles del componente B. Se combinan y mezclan los colores base, ya que con estos colores base (amarillo, rojo y azul) además del blanco, negro y transparente se puede conseguir una amplísima gama de colores. Mezclando en distintas proporciones diferentes componentes B se obtienen distintos colores: amarillo, verde, naranja, gris, etc. Añadiendo el color blanco y/o negro se ajusta la tonalidad definitiva de los colores obtenidos. First, you work with the different colors available in component B. The base colors are combined and mixed, since with these base colors (yellow, red and blue) in addition to white, black and transparent you can achieve a wide range of colors. Mixing in different proportions different components B different colors are obtained: yellow, green, orange, gray, etc. Adding the white and / or black color adjusts the final hue of the colors obtained.
Una vez se dispone de todos los colores necesarios del componente B (con cada color se ha formado una esfera), a continuación, se procede a mezclar con las manos cada esfera de cada color de componente B con la misma cantidad de componente A (1 :1 ), éste último de color transparente, hasta que se obtiene un color uniforme. Como resultado se obtienen esferas del doble de tamaño de cada color. La proporción de componente A y B a mezclar debe ser aproximadamente 1 :1 , aunque no es imprescindible que dicha relación sea exacta. No es necesario pesar cada componente A y B para que la relación en peso sea 1 :1 . Con mezclar aproximadamente la misma cantidad de componente A con componente B de tamaños similares (medido a ojo) es suficiente para obtener el efecto de la invención.  Once all the necessary colors of component B are available (with each color a sphere has been formed), then each sphere of each color of component B is mixed with the same amount of component A (1) : 1), the latter transparent, until a uniform color is obtained. As a result, spheres twice the size of each color are obtained. The proportion of component A and B to be mixed must be approximately 1: 1, although it is not essential that this ratio be exact. It is not necessary to weigh each component A and B so that the weight ratio is 1: 1. Mixing approximately the same amount of component A with component B of similar sizes (measured by eye) is sufficient to obtain the effect of the invention.
Una vez mezclados los dos componentes (A+B) puede iniciarse el modelado de piezas o figuras con el diseño deseado (véase Fig. 1 ).  Once the two components (A + B) have been mixed, modeling of pieces or figures with the desired design can be started (see Fig. 1).
La composición de silicona de la invención se modela con facilidad, no colapsa, no mancha, no huele. Las siliconas de colores se pegan entre sí, e incluso se pueden despegar con facilidad lo que facilita corregir errores en el modelado.  The silicone composition of the invention is easily modeled, does not collapse, does not stain, does not smell. Colored silicones stick together, and can even be easily peeled off, which makes it easier to correct modeling errors.
Una vez conformadas las figuras, se procede al curado. En este caso el curado de las figuras se realizó en un horno microondas, a una potencia de 800 W y la transformación del 100% a fase elástica terminó en unos 10 minutos.  Once the figures are formed, curing is carried out. In this case the curing of the figures was carried out in a microwave oven, at a power of 800 W and the transformation of 100% to the elastic phase was completed in about 10 minutes.
Ejemplo 3: Elaboración de protector para manillar bicicleta  Example 3: Development of bicycle handlebar protector
Componente B (Azul) + Componente A (transparente): se cogen dos porciones del mismo tamaño aproximadamente de cada componente, y se mezclan con las manos. Una vez que la mezcla se ha homogeneizado (color azul), se procede a modelar. Se modelan churros de diámetro similar, y se colocan en forma de espiral en el manillar de la bicicleta. Una vez cubierto todo el manillar con la silicona, se deja que cure la silicona sobre el manillar a temperatura ambiente. En un plazo de 24-36 horas la silicona ya está curada (véase Fig. 3).Component B (Blue) + Component A (transparent): two portions of approximately the same size of each component are taken, and mixed with the hands. Once the mixture has been homogenized (blue color), it is modeled. Churros of similar diameter are modeled, and spirally placed on the handlebars of the bicycle. Once the entire handlebar is covered with silicone, the silicone is allowed to cure on the handlebar at room temperature. Within 24-36 hours the silicone is already cured (see Fig. 3).
Ejemplo 4: Elaboración de molde con la composición de silicona de la invención Example 4: Mold making with the silicone composition of the invention
Componente B (transparente) + componente A (transparente): se cogen dos porciones del mismo tamaño aproximadamente de cada componente, y se mezclan con las manos. Una vez que la mezcla se ha homogeneizado (color transparente), se modela y se incrusta la figura a copiar. De esta forma se crea la cavidad, o negativo en la composición de silicona de la invención. En este caso, la figura es un cangrejo de plástico. Se deja que cure a temperatura ambiente. En un plazo de 24 a 36 horas la composición de silicona de la invención ya está curada, y se procede a retirar la figura de plástico. Una vez retirada la figura de plástico, ya está creado el molde listo para ser utilizado con infinidad de productos (jabones, cera, arcilla polimérica, etc..) (véase Fig. 2). Component B (transparent) + component A (transparent): two portions of approximately the same size of each component are taken, and mixed with the hands. Once the mixture has been homogenized (transparent color), the figure to be copied is modeled and embedded. In this way the cavity is created, or negative in the silicone composition of the invention. In this case, the figure is a plastic crab. It is allowed to cure at room temperature. Within a period of 24 to 36 hours the silicone composition of the invention is already cured, and the plastic figure is removed. Once removed the plastic figure, already The mold ready to be used with many products (soaps, wax, polymer clay, etc.) is created (see Fig. 2).
A pesar de que se ha hecho referencia a una realización concreta de la invención, es evidente para un experto en la materia que la composición inventiva de la invención descrita es susceptible de pequeñas variaciones y modificaciones, y que todos los detalles mencionados pueden ser substituidos por otros técnicamente equivalentes, sin apartarse del ámbito de protección definido por las reivindicaciones adjuntas.  Although reference has been made to a specific embodiment of the invention, it is apparent to one skilled in the art that the inventive composition of the described invention is susceptible to minor variations and modifications, and that all the mentioned details can be replaced by others technically equivalent, without departing from the scope of protection defined by the appended claims.

Claims

REIVINDICACIONES
1 . Composición elastomérica de silicona bicomponente adecuada para curar indistintamente a temperatura ambiente, elevada temperatura o radiación electromagnética, caracterizada por el hecho de que comprende elastómero de polidimetilsiloxano de alta consistencia y por el hecho de que dicha composición es una mezcla binaria de dos componentes, A y B, a partes substancialmente iguales, donde  one . Two-component silicone elastomeric composition suitable for curing at room temperature, high temperature or electromagnetic radiation, characterized by the fact that it comprises high consistency polydimethylsiloxane elastomer and by the fact that said composition is a binary mixture of two components, A and B, to substantially equal parts, where
- el componente A incluye los siguientes ingredientes: elastómero de polidimetilsiloxano 40- 85%, carga reforzante: sílice pirogénica y/o sílice precipitada 10-30%, agente de curado: polihidrógenometilsiloxano 0,5-10%, donde los porcentajes están expresados en peso con respecto al peso del componente A, con la condición de que la suma de todos los componentes de A no supere el 100%, y  - component A includes the following ingredients: 40-85% polydimethylsiloxane elastomer, reinforcing filler: pyrogenic silica and / or 10-30% precipitated silica, curing agent: 0.5-10% polyhydrogenomethylsiloxane, where the percentages are expressed in weight with respect to the weight of component A, with the proviso that the sum of all components of A does not exceed 100%, and
- el componente B incluye los siguientes ingredientes: elastómero de polidimetilsiloxano 40- 85%, carga reforzante: sílice pirogénica y/o sílice precipitada 10-30%, catalizador de platino: 1 -8% y pigmentos: hasta 5%, donde los porcentajes están expresados en peso con respecto al peso del componente B, con la condición de que la suma de todos los componentes de B no supere el 100%.  - Component B includes the following ingredients: 40-85% polydimethylsiloxane elastomer, reinforcing filler: pyrogenic silica and / or 10-30% precipitated silica, platinum catalyst: 1-8% and pigments: up to 5%, where percentages they are expressed in weight with respect to the weight of component B, with the proviso that the sum of all components of B does not exceed 100%.
2. Composición según la reivindicación 1 , donde la composición presenta una viscosidad Mooney antes de curado comprendida entre 15 y 75 mPa s y una dureza Shore después de curado comprendida entre 10 y 80 Sh A.  2. Composition according to claim 1, wherein the composition has a Mooney viscosity before curing between 15 and 75 mPa s and a Shore hardness after curing between 10 and 80 Sh A.
3. Composición según la reivindicación 1 , donde 3. Composition according to claim 1, wherein
- el componente A incluye los siguientes ingredientes: elastómero de polidimetilsiloxano 50-80%, carga reforzante: sílice pirogénica y/o sílice precipitada 15-25% y agente de curado: polihidrógenometilsiloxano 1 -5% donde los porcentajes están expresados en peso con respecto al peso del componente A, y la suma de todos los ingredientes del componente A no supera el 100%, y  - Component A includes the following ingredients: 50-80% polydimethylsiloxane elastomer, reinforcing filler: 15-25% pyrogenic silica and / or precipitated silica and curing agent: 1-5% polyhydrogenomethylsiloxane where the percentages are expressed by weight with respect to to the weight of component A, and the sum of all the ingredients of component A does not exceed 100%, and
- el componente B incluye los siguientes ingredientes: elastómero de polidimetilsiloxano 50-80%, carga reforzante: sílice pirogénica y/o sílice precipitada 15-25%, catalizador de platino: 1 -5% y pigmentos: hasta 5%, donde los porcentajes están expresados en peso con respecto al peso del componente B, y la suma de todos los ingredientes del componente B no supera el 100%.  - Component B includes the following ingredients: 50-80% polydimethylsiloxane elastomer, reinforcing filler: pyrogenic silica and / or 15-25% precipitated silica, platinum catalyst: 1-5% and pigments: up to 5%, where percentages they are expressed in weight with respect to the weight of component B, and the sum of all the ingredients of component B does not exceed 100%.
4. Composición según una cualquiera de las reivindicaciones anteriores, donde los componentes A y B a partes substancialmente iguales incluye una relación entre los componentes A y B comprendida entre 0,8:1 ,2 y 1 ,2:0,8, preferiblemente 1 :1 . 4. Composition according to any one of the preceding claims, wherein components A and B to substantially equal parts include a ratio between components A and B between 0.8: 1, 2 and 1, 2: 0.8, preferably 1 :one .
5. Composición según una cualquiera de las reivindicaciones anteriores, donde el componente A es transparente y el componente B es transparente o coloreado. 5. Composition according to any one of the preceding claims, wherein component A is transparent and component B is transparent or colored.
6. Composición según una cualquiera de las reivindicaciones anteriores modelable a temperatura ambiente durante un periodo de tiempo de hasta 5 horas y curable a temperatura ambiente en un periodo de tiempo de 24-48 horas según tamaño.  6. Composition according to any one of the preceding claims modelable at room temperature for a period of up to 5 hours and curable at room temperature in a period of 24-48 hours depending on size.
7. Composición según una cualquiera de las reivindicaciones anteriores modelable a temperatura ambiente durante un periodo de tiempo de hasta 5 horas y curable por aire caliente o por radiación electromagnética en minutos.  7. Composition according to any one of the preceding claims modelable at room temperature for a period of up to 5 hours and curable by hot air or electromagnetic radiation in minutes.
8. Producto modelable obtenible a partir de una composición según una cualquiera de las reivindicaciones anteriores.  8. A modelable product obtainable from a composition according to any one of the preceding claims.
9. Producto según la reivindicación 8, donde dicho producto no degrada a temperaturas comprendidas entre -40 y +250eC. 9. Product according to claim 8, wherein said product does not degrade at temperatures between -40 and +250 and C.
10. Producto según cualquiera de las reivindicacione 8 ó 9, donde el producto es un molde para duplicar piezas.  10. Product according to any of claims 8 or 9, wherein the product is a mold for duplicating parts.
1 1 . Procedimiento para obtener un producto moldeable a partir de la composición definida en una cualquiera de las reivindicaciones 1 a 7, caracterizado por el hecho de que comprende: iv) mezclar una parte del componente A con otra parte del componente B a partes substancialmente iguales;  eleven . Process for obtaining a moldable product from the composition defined in any one of claims 1 to 7, characterized in that it comprises: iv) mixing a part of component A with another part of component B to substantially equal parts;
v) modelar en condiciones de presión y temperatura ambientales, donde la etapa de modelado dispone de un periodo de hasta 5 horas; y  v) modeling under ambient pressure and temperature conditions, where the modeling stage has a period of up to 5 hours; Y
vi) curar el producto a temperatura ambiente en un periodo de tiempo comprendido entre 24-48 horas según tamaño, o curar el producto por aplicación de aire caliente o radiación electromagnética en minutos.  vi) cure the product at room temperature in a period of time between 24-48 hours depending on size, or cure the product by application of hot air or electromagnetic radiation in minutes.
12. Procedimiento según la reivindicación 1 1 , donde la etapa de curar el producto por aplicación de aire caliente incluye una temperatura superior a 80°C.  12. A method according to claim 1, wherein the step of curing the product by application of hot air includes a temperature greater than 80 ° C.
PCT/ES2018/070228 2017-03-31 2018-03-23 Two-part silicone elastomer composition for modelling WO2018178451A1 (en)

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