KR920007575B1 - Mold-shaping material and production of forming mold using said material - Google Patents

Abstract

No content.

Description

Molding material and manufacturing method of molding die using the same

The present invention relates to a mold material and a method for producing a mold using the same, and more particularly, to a mold material for molding a mold having excellent mold release property and a method for manufacturing a mold using the same. Rubber-like properties based on polyorganosiloxane, that is, silicone rubber, have been widely used in various fields for their excellent heat resistance, electrical properties, cold resistance, and durability. The use of silicone rubber may include potting, coating, coating, etc. One of the main uses is to form a molded product by curing in a mold. The moldings thus obtained are produced in the field of production, such as rubber parts for durable consumer goods such as anode caps of TVs, oil seals of automobiles, first-class consumer goods such as bottle nipples, nose rings of glasses, and rubber molds for resin molding. It is used. The silicone rubber can be roughly classified into a mirrorable rubber and a liquid polymer having a relatively low polymerization degree by crosslinking and curing a solid composition composed of a relatively high degree of polymerization of a base polymer and an inorganic filler with an organic peroxide. There are liquid rubbers with relatively low mechanical properties, which are hardened by various crosslinking mechanisms. Examples of the crosslinking reaction of silicone rubbers include radical reactions using organic peroxides, condensation reactions between hydrolyzable silane compounds and silanol group-containing polymers, and addition reactions between unsaturated hydrocarbons and Si—H groups bonded to silicon atoms. .

Although each of them has advantages and disadvantages, curing by addition reaction is easy to adjust the curability, in particular, it can be cured in a short time by slight heating, shrinkage rate after curing of the molded product is small, and by-products do not occur during curing. There is this.

The curing mechanism by such an addition reaction is employed in liquid rubber and mirrorable rubber and is also used as a molding material.

This addition-reactive polyorganosiloxane composition has been used as a template material since it came out on the market, but its use has been in the field of strong industrial color such as fire tools and art works.

In recent years, however, this is widely used in the field of prototype molding. In the electrical and electronics industry and the automobile industry, many plastic (molded ABS resin) moldings are used, but since they are thermoplastic resins, molding by molding is performed. These plastic molded articles are in a new form when the product is renewed and improved. Therefore, dozens of prototypes of such molded articles need to be examined. Prototype molding is what makes this prototype.

The way to make this is to create a new mold by shaping it, or to cut and assemble the plate, but all are very costly and time-consuming. Prototype molding has recently been developed, in which a model is made and a two-packed room-temperature-curable polyorganosiloxane composition is used as a mold material, and a rubber mold is made therein, and a thermosetting resin is injected and cured to obtain a replica. As a result, both cost and turnaround time show a big improvement. This method is also due to the improved physical properties of the thermosetting resin, which is closer to the plastic properties. In addition, since the apparent viscosity of the system does not excessively increase even when applied in a large amount to the liquid rubber of such an additional type, a highly surface-treated filler is used, which is advantageous for increasing mechanical strength. By using polysiloxane together, the mechanical strength comparable to the mirrorable silicone rubber can be given to the curable molded article of the liquid rubber, and the molded article can be easily obtained in a short time for injection molding using the silicone rubber for flowable additive molding.

As described above, the silicone rubber using the addition reaction has a suitable curing property as a molding material, but has a difficulty in that releasability from the mold is poor. For example, in the case of molding with an additive liquid silicone rubber, it is easy to adhere to the mold and a heating device is required for manufacturing the rubber mold. In addition, for example, as the mechanical properties of urethane or epoxy resin materials are improved for prototyping, there is a tendency that the releasability of these resins from the silicone rubber mold is further deteriorated.

In order to improve the productivity of the molded product by injection molding, one of the requirements is to easily take out the cured molded product from the mold. However, when injecting the above-described high-strength additive-type liquid silicone rubber into an injection mold, the molding mold has excellent peelability. Even if the mold is used, the molded article tends to adhere to the mold during the heat molding, and there is a difficulty in taking out the molded article, and the productivity thereof is hindered. The poor releasability from these additional silicone rubber molds is particularly noticeable when using a curing retardant in order to prolong working time or when curing at relatively low temperatures with this system. In order to solve this problem, the mold is applying a release agent such as fluorine on the surface.

As for the silicone rubber as a molding material, silicone foil or the like is added as an internal mold release agent, but this often affects the properties of the molded article in various ways and is not sufficient. Japanese Patent Application Laid-Open No. 58-19357 shows the use of a specific polyorganohydrogen polysiloxane, which has a considerable effect of improving the release property, but much improvement is still desired.

Japanese Patent Application Laid-Open No. 55-7217 discloses a dental impression material in which a fine powder of a metal palladium or an alloy thereof is blended with an addition-type silon-curable polyorganosiloxane composition.

However, this is for the purpose of adsorbing hydrogen gas generated during hardening by powder of metal palladium or alloy thereof to prevent defects of precision impression due to bubbles of hydrogen gas when pulling up, i.e., forming a mold. The idea of an improvement in dysplasia of the main source of income does not appear.

An object of the present invention is to provide a molding die material for a molding die having excellent mold release properties from a mold and a mold release obtained from a mold, and a molding die manufacturing method for a resin mold using the same.

The present inventors have described the method of improving the mold release property of the curable polyorganosiloxane composition to obtain a mold material suitable for prototyping, thereby improving the mold release property between the mold and the mold and the mold release property from the mold. As a result of a thorough examination by a method different from one conventional method, the present inventors have found that compounding a specific metal enhances the release property to the resin.

The present invention is

A polyorganosiloxane having at least two unsaturated aliphatic hydrocarbon groups bonded to a silicon atom in one molecule.

Polyorganohydrogen siloxane having three or more hydrogen atoms in one molecule bonded to silicon atoms of B: For each unsaturated aliphatic hydrocarbon group in component A, the number of hydrogen atoms bonded to silicon atoms is 0.5-5. amount.

C Platinum Complex Catalyst: 0.2-1,000ppm based on platinum element relative to the total amount of A and B components.

D Metal selected from the group consisting of palladium, rhodium, platinum and the like or powders of alloys thereof supported on them: consisting of 5-1000 ppm in terms of metal elements relative to the total amount of A and B components The mold material characterized by the above-mentioned, and the above-mentioned mold material is molded and hardened.

The polyorganosiloxane of A component used for this invention is a component which becomes the base polymer which is a mold material of this invention. Any one having at least two unsaturated aliphatic hydrocarbon groups directly linked to the silicon atom of the component A can form a network structure by an addition reaction, so long as it has been used as a component of the addition type curable polyorganosiloxane composition. good. Examples of the unsaturated aliphatic hydrocarbon group include vinyl group, aryl group, 1-butenyl group, 1-hexenyl group and the like, but the vinyl group is most advantageous in view of ease of synthesis.

Other organic substances bonded to the silicon atom of the siloxane unit include alkyl groups such as methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, octyl group, decyl group and dodecyl group; Aryl groups such as phenyl groups; Aralkyl groups such as benzyl, 2-phenylethyl and 2-phenylpropyl; Substituted hydrocarbon groups, such as a chloromethyl group, a chlorophenyl group, 2-cyanoethyl group, and a 3,3,3- trifluoro propyl group, are illustrated.

Among them, the methyl group is most suitable in view of ease of synthesis and excellent balance of properties such as mechanical strength and fluidity before curing. The unsaturated aliphatic hydrocarbon group may be present at or at the end or in the middle of the molecular chain of the polyorganosiloxane, but is preferably present at least at the sock end to give the cured product excellent mechanical properties. The siloxane skeleton may be linear or branched.

In this invention, it is also possible to mix and use a linear compound and a branched compound.

In the case of using these mixtures, in order to increase the mechanical strength or elastic modulus of the cured product, as the polyorganosiloxane component, R ₃ SiO unit, R ₂ SiO 1/2 unit, and SiO ₂ unit (R represents the aforementioned organic group, 2-50% by weight of a branched polyorganosiloxane composed of at least two unsaturated aliphatic hydrocarbon groups) and the remainder of the mixture consisting of a polyorganosiloxane sealed with a linear sockdan unsaturated aliphatic hydrocarbon group. proper.

Although the polymerization degree of A component is not specifically limited, In order to have favorable fluidity | liquidity and workability before hardening, and to have suitable elasticity after hardening, it is suitable that it is suitable that it is 40-2,000 and it is especially preferable that it is 100-1,000.

The polyorgano hydrogen siloxane of component B used in the present invention is a compound which acts as a crosslinking agent of component A and must have at least three hydrogen atoms bonded to silicon atoms in order to resemble the cured product.

As the organic group bonded to the silicon atom of the siloxane unit,

Examples of the group A component are exemplified, and among them, methyl group is most suitable in view of ease of synthesis.

The siloxane skeleton of the B component may be any of linear, branched and cyclic.

Moreover, you may use these mixture also in this invention.

Although the polymerization degree of B component is not specifically limited, Since the compound which combines two or more hydrogen atoms with the same silicon atom is difficult to synthesize | combined, it is suitable to consist of three or more siloxane units.

Specific examples of the component B include the following compounds.

a. Branched polyorganohydrogen siloic acid consisting of (CH ₃ ) ₂ HSiO 1/2 unit and SiO ₂ unit

b. Formula:

(Wherein p represents an integer of 3-100, p represents an integer of 0-100), and is a linear polyorgano hydrogen siloxane

c. Formula

The compounding amount of the linear polyorganohydrogen siloxane B component represented by (wherein p represents 3-100 and p represents an integer of 0-100) is contained in the B component for one unsaturated aliphatic hydrocarbon group in the A component. The amount of hydrogen atoms bonded to the silicon atoms of is 0.5-5, preferably 1-3.

If the hydrogen atom is less than 0.5, the curing is not completely completed, and thus the mold separation properties and mold release properties are lowered because the mold obtained by floating the mold or the mold has adhesiveness. On the contrary, when there are more than five hydrogen atoms, foaming is likely to occur during curing, and this forms a mold or a molded body having poor surface conditions by gathering at the interface between the mold and the mold and the mold obtained by floating the mold and the mold. However, the obtained mold or molded body becomes brittle, and the mold recovery of the resin, that is, the mold life, is lowered and the mechanical strength is lowered.

The C-platinum complex catalyst used in the present invention is a catalyst for promoting the addition reaction between the unsaturated aliphatic hydrocarbon group of the component A and the hydrosyryl group of the component B and is excellent in that the curing ability is good at or near room temperature. . Examples of the platinum complex include chloroplatinic acid, reaction products of chloroplatinic acid and alcohols, platinum-olefin complexes, platinum vinylsiloxane complexes, platinum phosphine complexes, and the like. Among them, they have good solubility and catalytic activity in A and B components. Reaction products of chloroplatinic acid and alcohols and platinum vinylsiloxane complexes are suitable. The compounding quantity of C component is 0.2-1,000 ppm or 1-100 ppm in conversion of a platinum element with respect to the total amount of A, B component.

If the content is less than 0.2 ppm, the curing speed is slow and the curing is not completely completed. Therefore, the molded product obtained by floating the mold or the mold exhibits adhesiveness and the releasability is lowered. If the content exceeds 1,000 ppm, the curing speed becomes too fast, and thus the workability after the compounding of each component is impaired, which is uneconomical.

D component used in this invention is a component which comprises the maximum characteristic of the mold material of this invention. This component D exhibits the releasability from the mold of the mold obtained by curing and the effect of improving the releasability from the mold of the replica obtained by injecting and curing the resin into the mold, and the mold releasability from the mold of the molded article obtained by curing. It is a component having an action of improving.

As the D component, a metal selected from the group consisting of palladium, rhodium and platinum and powders of alloys thereof, or those supporting them on various carriers are used. Examples of such a carrier include carbon, alumina, silica and the like. Among these three metals, platinum having the greatest effect of improving releasability is the best. In addition, it is preferable that the carrier is supported on the carrier rather than the metal powder in that the effect of improving the releasability per weight of metal is large.

The blending amount of the D component is 5-1,000 ppm, preferably 10-500 ppm in terms of metal elements relative to the total amount of the A and B components.

In the case of 5 ppm or less, the effect of improving the release property is hardly seen. On the other hand, even if it is added 1,000 ppm or more, improvement of this thinness cannot be desired and it is uneconomical. The mold material of the present invention may contain an inorganic filler in order to increase the mechanical strength of the molded body. Inorganic fillers include fumed silica, precipitated silica, silica aerogels, novel silica, reinforcing fillers such as titanium oxide, fumed crushed quartz, diatomaceous earth, aluminosilicate, asbestos, powdered mica, alumina, zinc oxide, iron oxide, carbonate Non-reinforcing fillers such as calcium are exemplified and these may be used by treating the surface with organosilicon compounds such as trimethylchlorosila, polydimethylsiloxane, hexamethyldisilazane.

Moreover, in order to extend the hardening time at room temperature of the mold material used for this invention, you may mix | blend hardening retarders, such as an acetylene compound, a diaryl maleic acid, a triaryl isocyanurate, a nitrile compound, or an organic peroxide. In addition, you may mix | blend a pigment, a plastic material, etc. as needed.

The mold material of the present invention is generally used after the components containing the B component, C component and D component are separately stored and uniformly mixed with the positive components just before use, but all components in the same container in the presence of the reaction retardant are used. It is also possible to preserve.

The manufacturing method of the molding die of the present invention is, for example, a method of curing the mold material in a desired model, a method of installing the model in a suitable container, and then pouring the mold material into the container described above and curing the mold material. The curing temperature may be any room temperature or higher, but is appropriately determined according to the use of the molded body to be cast or the injection method into the mold.

For example, in the case of injection molding, a curing temperature of 50-250 ° C. is appropriate. Below 50 ° C., curing is slow and requires a long time for the molding cycle. On the contrary, if it exceeds 250 degreeC, the mechanical property of a molded object will fall.

The mold material of the present invention exhibits excellent mold release properties, and a molded article excellent in mold release properties with respect to a model can be obtained.

Molding molds obtained from such mold materials exhibit excellent release properties for various mold materials and are extremely useful in the field of prototyping. In addition, the production method of the present invention greatly improves the productivity of the molding die, in particular, the long working time using the curing retardant is particularly useful for the mold forming of the addition-reactive composition, for example, the production of various rubber parts for injection molding It is applied to the manufacture of silicone rubber molds used in prototyping molding.

Hereinafter, the present invention is shown by examples. Herein, all parts are parts by weight, and all physical property values such as viscosity are the values at 25 ° C.

Example 1

180 parts of xylene soluble vinyl polysiloxane condensates composed of 770 parts of polydimethylsiloxane, trimethylsiloxy unit, dimethylvinylsiloxy unit and SiO ₂ units (molar ratio 5: 1: 7) in which the sock end having a viscosity of 98,000 cP, 50 parts of methylhydrogen polysiloxane having a viscosity of 20 cP (containing 0.9% by weight of Si-H group), 1 part of 5% platinum supported on alumina powder, and 1.5 parts of chloroplatinic acid octanol complex (containing 2% by weight of platinum) uniformly Mixing was carried out to obtain a mold material. Its viscosity was 63,000 cP and could easily be put into the mold.

Moreover, it poured into the metal mold | die of thickness 2mm, it was left to stand at room temperature for 24 hours, and the sheet-like hardened | cured material was obtained. This sheet-like hardened | cured material was heated at 150 degreeC for 30 minutes, and it hardened completely. Its physical properties are as follows. Hardness 43 (JIS A), tensile strength 22 kg.f / cm 2, stretch 280% pull rupture strength 12 kg.f / cm (JIS A). Next, a mold made of ABS resin was placed in a container having a width of 8 cm, a width of 15 cm, and a height of 5 cm, and the mold material was poured therein, and allowed to stand at room temperature for 24 hours, followed by heating at 60 ° C for 4 hours.

The model was taken out of the cured product to obtain a silicone rubber mold. The release property was tested using this silicone rubber frame. That is, the packaged urethane resin high cast 3075 (trade name, between Kokusai Chemical Co., Ltd.) was injected into the silicone rubber mold and cured to obtain a replica. Continuing the manufacture of this replica, the 36th mold outlining was seen as strong, and the 44th part was glued to show the partial destruction of the rubber mold.

In addition, when the CEP-5 (trade name, Koku Chemical Co., Ltd.), a two-package epoxy resin, was used as the injection resin, the mold separation was severely felt in the 12th, and in the 15th part, the part was adhered and the rubber frame was partially broken. appear.

Example 2-7, Comparative Example 1

In the mold material of Example 1, the material was obtained by the metal powder of the kind shown in Table 1, and addition amount instead of 1 part of 5% platinum supporting alumina powder. Using this mold material, a mold test was carried out for the same epoxy resin CEP-5 as in Example 1. The results are shown in Table 1.

TABLE 1

Example 8

80 parts of xylene soluble vinyl polysiloxane condensates composed of 725 parts of polydimethylsiloxane, a trimethylsiloxy unit, a dimethylvinylsiloxy unit, and a SiO ₂ unit (molar ratio 5: 1: 7) of a sock end having a viscosity of 9,500 cP, 170 parts of fumed silica treated with trimethylchlorosilane, 25 parts of methylhydrogen polysiloxane having a viscosity of 20 cP (containing 0.9 wt% of Si-H group), 1 part of 5% platinum-supported alumina powder, platinum-tetramethyltetravinylcyclo 1.4 parts of tetrasiloxane complex compounds (containing 2 weight% of platinum) were uniformly mixed to obtain a mold material.

Its viscosity was 51,000 cP and could be easily poured into the mold. Moreover, it poured into the metal mold | die of thickness 2mm, it was left to stand at room temperature for 24 hours, and the sheet-like hardened | cured material was obtained. This sheet-like hardened | cured material was heated at 100 degreeC for 1 hour, and it hardened completely. Its physical properties are as follows.

Hardness 40 (JIS A), tensile strength 52 kg.f / cm 2, stretch 330% pull rupture strength 20 kg.f / cm (JIS A). When the mold test was carried out in the same manner as in Example 1 using this mold material, mold separation was severely felt at the 38th time for high cast (3075) of urethane resin, and adhesion was noticeable at the 45th time. For CEP-5 of epoxy resin, mold separation was severe at 10th and adhesion was noticeable at 16th.

Comparative Example 2

In the mold material of Example 8, the same mold test as in Example 1 was conducted using no addition of 5% platinum-supported alumina powder. As a result, the mold separation was severely felt in the 12th for high cast (3075) of urethane resin, and the adhesive shape phenomenon appeared in the 18th. For epoxy resin CEP-5, mold separation was very severe from the first, and adhesion phenomenon was already seen in the seventh.

Comparative Example 3

In the composition of Example 3, the mold test was carried out as in Example 1 using no 5% platinum-supported alumina powder and 50 parts of dimethylpolysiloxane having a viscosity of 50 cP. As a result, the mold separation was severe at the 24th and the adhesion at the 29th for the high cast urethane resin (3075). Moreover, when the obtained replica was coated with acrylic paint, the frying phenomenon appeared partially. For CEP-5 of epoxy resin, mold separation was very severe from the first and adhesion phenomenon occurred in the 11th.

[Comparative Example 4]

In the mold material of Example 8, the same mold material was prepared without using any 5% platinum-supported alumina powder, and the same injection molding as in Example 8 was performed. The cured moldings appeared to be in close contact with the mold and did not peel off.

Example 9

280 parts of xylene soluble vinyl polysiloxane condensate consisting of 650 parts of polydimethylsiloxane, trimethylsiloxy unit, dimethylvinylsiloxy unit and SiO ₂ unit (molar ratio 5: 1: 7) in which the sock end of viscosity 98,000 cP is sealed with vinyl group, 70 parts of methylhydrogen polysiloxane having a viscosity of 20 cP (containing 0.9% by weight of Si-H group), 1 part of 5% platinum-supported alumina powder, and 0.2 parts of platinum-tetravinyltetramethylcyclotetrasiloxane complex (containing 2% by weight of platinum) 0.3 parts of bis (1,1-dimethylpropargyloxy) (1,1-dimethylpropargyloxy) dimethylsilane were mixed uniformly to obtain a mold material. Its viscosity was 72,000 cP, and even if it was left at 25 ° C. for 8 hours, the viscosity was not increased to 103,000 cP. This was press-molded at 150 degreeC for 15 minutes to the metal mold | die which chrome-plated the surface of thickness 2mm, and the sheet-like hardened | cured material was obtained. Its physical properties were as follows.

Hardness (JIS A) 58, tensile strength 59 kg.f / cm 2, stretch 310% pull rupture (JIS A) 16 kg.f / cm. 16 pieces of test specimens of 20 mm long, 10 mm short and 2 mm thick oval planks chrome-plated on the surface of the mold were injected into the mold at a pressure of 250 kg.f / cm ² and heated at 110 ° C for 250 seconds. After curing, the mold was taken out. The release property from the metal mold | die of curable molding was favorable, and it was easy to take out.

[Examples 10-15 and Comparative Examples 4 and 5]

The mold material was obtained using the metal powder of the kind and addition amount shown in Table 2 instead of 1 part of 5% platinum supporting alumina powder in the mold material of Example 9. Injection molding was carried out in the same manner as in Example 8 using this mold material, and the release property from the mold of the molded product was observed. The results are shown in Table 2.

TABLE 2

Example 16

100 parts of xylene soluble vinyl polysiloxane condensate composed of 880 parts of polydimethylsiloxane, a trimethylsiloxy unit, a dimethylvinylsiloxy unit and a SiO ₂ unit (molar ratio 5: 1: 7) in which the sock end having a viscosity of 40,500 cP, 20 parts of methylhydrogen polysiloxane having a viscosity of 20 cP (containing 0.9 wt% of Si-H group), 300 parts of fumed silica having a specific surface area of 200 m 2 / g treated with trimethylchlorosilane, and a chloroplatinic acid octanol complex compound (2 weight of platinum) %)) 0.15 parts, 5 parts of platinum supported on an alumina powder, and 1 part of bis (1,1-dimethylpropargyl) dimethylsilane were mixed uniformly to obtain a mold material. This was put into the metal mold | die which chrome plated the surface of thickness 2mm, and the sheet-shaped hardened | cured material was obtained by press molding at 170 degreeC for 15 minutes.

The sheet-shaped hardened | cured material could be easily taken out from the metal mold | die. Its physical properties are as follows. Hardness (JIS A) 38, tensile strength 90kg.f / cm2, stretch 650% pull rupture strength (JIS A) 35kg.f / cm. Four die-shaped test specimens of 120 mm in diameter and 5 mm in thickness, which were chrome plated on the surface of the mold material, were injected into the mold at a pressure of 1.5 t / cm 2, heated at 160 ° C. for 80 seconds, and cured. The release property in the metal mold | die of the hardened molding was favorable, and it was easy to take out.

Comparative Example 6

The mold material was produced and injection-molded in the same manner except that no 5% platinum-supported alumina powder was used in the mold material of Example 8. The hardening product appeared to adhere closely to the mold and did not peel off well.

Example 17

80 parts of xylene soluble vinyl polysiloxane condensate composed of 725 parts of polydimethylsiloxane, a trimethylsiloxy unit, a dimethylvinylsiloxy unit, and a SiO ₂ unit (molar ratio 5: 1: 7) of a sock end having a viscosity of 9,500 cP, 25 parts of methylhydrogen polysiloxane having a viscosity of 20 cP (containing 0.9 wt% of Si-H group), 170 parts of fumed silica having a specific surface area of 200 m 2 / g treated with trimethylchlorosilane, 1 part of 5% platinum-supported alumina powder, platinum -1.4 parts of tetravinyl tetramethyl cyclotetrasiloxane complex (containing 2.0 wt% platinum) and 5.5 parts of bis (1,1-dimethyl propargyloxy) dimethylsilane were uniformly mixed to obtain a mold material. Its viscosity was 51,000 cP and could be easily poured into the mold.

Even if it was left to stand at 30 degreeC for 24 hours, the viscosity did not change very much to 53,000 cP. This was put in the metal mold | die which chrome-plated the surface of thickness 2mm, and the sheet-shaped hardened | cured material was obtained by press molding at 150 degreeC for 15 minutes.

The sheet-shaped hardened | cured material could be easily taken out from the metal mold | die. Its physical properties were as follows.

Hardness 42 (JIS A), tensile strength 55 kg.f / cm 2, stretch 310% pull burst strength 18 kg.f / cm (JIS A). Next, a model made of ABS resin was fixed in a container made of a plywood having a length of 45 cm, a width of 20 mm, and a height of 60 mm, the mold material was poured therein, and left at 60 ° C. for 13 hours to cure. Then, the makeup plywood container was taken out, and then cut out with a scalpel to take out a model made of ABS resin to obtain a silicone rubber mold. The silicone rubber mold was easily removed from the ABS resin model.

Comparative Example 7

The silicone rubber mold was molded in the same manner except that no 5% platinum-supported alumina powder was used in the mold material of Example 9.

As a result, there was a part that the silicone rubber was strongly adhered to the model made of ABS resin, and when peeled off forcibly, part of the rubber mold was torn off.

Claims (2)

A polyorganosiloxane having two or more unsaturated aliphatic hydrocarbon groups bonded to a silicon atom in one molecule, and a polyorganohydrogen siloxane having three or more hydrogen atoms in one molecule bonded to a silicon atom: Unsaturated A component Amount of aliphatic hydrocarbons having 0.5-5 hydrogen atoms bonded to silicon atoms per one, C platinum compound catalyst: 0.2-1,000 ppm in terms of platinum element relative to the total amount of A and B components, D palladium, rhodium A metal selected from the group consisting of platinum and powders of alloys thereof, or those supported by a carrier: a mold material comprising 5-1,000 ppm in terms of metal elements relative to the total amount of the A and B components. A method for producing a molding die, wherein the mold material according to claim 1 is molded and cured.