JP6611339B2 - Method for producing silicone molded product - Google Patents

Description

  The present invention relates to a silicone molded article and a method for producing the same.

  Silicone is colorless and odorless and has water repellency, oil resistance, oxidation resistance, heat resistance, and electrical insulation, so it is used in a wide range of fields such as architecture, toys, medical, electrical / electronic, and cosmetics. Many types of silicone resin (silicone rubber) molded products such as smartphone cases, cooking utensils, and packing are provided.

  However, the silicone resin has a drawback that it is difficult to firmly bond the molded product to another member. By using silicone adhesives, silicone resin molded products (silicone molded products) can be bonded to other members, but silicone adhesives are not universal and are urethane resins and vinyl chloride resins. The compatibility is poor and they cannot be bonded to the silicone molded product. Moreover, it is very difficult to coat another resin on the silicone resin due to the high releasability of the silicone resin.

  For example, in Patent Document 1, a porous material is bonded to a silicone molded article with a silicone-based adhesive, and a portion that is not impregnated with the silicone-based adhesive is provided in the porous material. Can be bonded to other members.

JP-A-5-181984

  However, when the silicone adhesive is cured, the silicone oil released from the inside of the cured silicone adhesive oozes out. When the exuded silicone oil permeates into the porous material and the silicone oil permeates into the surface of the porous material, the surface of the porous material cannot be satisfactorily adhered to other members. Further, when the surface of the porous material is bonded to another member and silicone oil reaches the bonded portion, the adhesive strength is reduced, and the porous material may be peeled off from the other member.

The objective of this invention is providing the manufacturing method of the silicone molded product which can be firmly attached to another member.

  In order to achieve the above object, a silicone molded article according to one aspect of the present invention includes a film and a main body formed on one surface of the film, the main component being a silicone resin, on one surface of the film. The silicone adhesive component adheres, and the silicone resin and the silicone adhesive component are mixed at least at the boundary between the main body and the film, and the film is made of a resin that does not allow silicone oil to permeate.

  According to this structure, the main body which uses a silicone resin as the main material is formed on one surface of the film. Moreover, the component of the silicone type adhesive has adhered to the one side of the film. And in the boundary part with the film in a main body, the component of a silicone resin and a silicone adhesive is mixed. Therefore, the main body and the film are firmly bonded via the silicone adhesive.

  The film is made of a resin that does not allow silicone oil to penetrate. Therefore, even if silicone oil oozes from the cured silicone pressure-sensitive adhesive, the silicone oil does not soak into the film and does not ooze out to the other side of the film (the surface opposite to the main body side). Therefore, the other side of the film and the other member can be firmly bonded with the adhesive. Since the main body and the film are firmly bonded, the other surface of the film is firmly bonded to the other member, whereby the main body is firmly attached (fixed) to the other member.

  A silicone molded article having such a structure is prepared by injecting a material mainly composed of a silicone resin into a concave portion of a mold, and preparing a film having a silicone-based adhesive on one side, and after the injecting step, one side of the film Facing the mold and placing the film so as to cover at least the entire surface of the material injected into the recess, the curing step after the placement step, curing the material in the recess, and curing after the curing step And a take-out step of taking out a molded product made of the material and a film integrated with the material from the mold.

  Further, in the method for producing a silicone molded product, the film is cut along the outer shape of the cured material using a cutting blade whose cutting edge is formed in the same shape as the opening end of the concave portion of the mold after the take-out process. A cutting step may be further included.

  By this cutting step, even if the film protrudes from the cured material, that is, the main body of the silicone molded product, the protruding portion of the film can be easily cut off. Moreover, since the main body of the silicone molded product is not cut, a main body having no cut surface on the surface can be obtained.

  The structure which does not have a cut surface in the main body is suitable when the phosphorescent material is included in the material of the main body. That is, in the main body using the mixed material of the silicone resin and the phosphorescent material, since it does not have a cut surface, it is possible to prevent moisture from entering into the main body. Can be suppressed. As a result, the degree of aging of the phosphorescent luminance of the phosphorescent material can be reduced, and the phosphorescent luminance of the phosphorescent material can be maintained high over a long period.

  The silicone molded article has a structure that further includes a double-sided adhesive sheet having adhesive layers on both sides, one adhesive layer being bonded to the other side of the film, and a release paper bonded to the other adhesive layer of the double-sided sheet. There may be.

  In this configuration, the silicone molded article can be easily attached to the other member by peeling the release paper and bonding the adhesive layer of the double-sided adhesive sheet to the other member.

  According to the present invention, a silicone molded product can be firmly attached to another member without using a silicone-based adhesive.

It is a perspective view of the silicone molded product which concerns on one Embodiment of this invention. It is a side view which shows the structure of the resin film of the state of a raw material schematically. It is an illustration side view of the silicone molded product of the structure by which the double-sided adhesive sheet was provided in the other side of the resin film. It is a perspective view of the silicone molded product of a shape different from the shape shown by FIG. It is a perspective view which shows the use condition of the silicone molded product of the shape shown by FIG. It is a perspective view which shows the manufacturing process of the silicone molded product of the shape shown by FIG. It is a perspective view which shows the manufacturing process (injection process) of the silicone molded product of the shape shown by FIG. It is a perspective view which shows the manufacturing process (an arrangement | positioning process, a hardening process) of the silicone molded product of the shape shown by FIG. It is a perspective view which shows the manufacturing process (extraction process, cutting process) of the silicone molded product of the shape shown by FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Structure of silicone molded product>
FIG. 1 is a perspective view of a silicone molded product 1 according to an embodiment of the present invention.

  The silicone molded product 1 includes a resin film 2 and a main body 3 formed on one surface of the resin film 2.

  FIG. 2 is a side view schematically showing the structure of the resin film 2 in a raw material state.

  The resin film 2 is made of a resin that does not allow silicone oil to permeate, for example, a polyester resin. In the state of the material before being integrated with the main body 3, as shown in FIG. 2, the resin film 2 is a silicone-based adhesive layer on one surface thereof, that is, the surface on which the main body 3 is formed. It has a certain adhesive layer 4. The thickness of the resin film 2 is, for example, 25 μm, and the thickness of the adhesive layer 4 is, for example, 30 μm.

  The main body 3 is a molded body mainly composed of a thermosetting or ultraviolet curable silicone resin (silicone rubber). The thermosetting silicone resin may be a low temperature curable silicone resin or a room temperature curable silicone resin.

  In a state where the main body 3 is formed on one surface of the resin film 2, the adhesive layer 4 included in the resin film 2 in a raw material state is integrated with the main body 3. In this state, the silicone adhesive component constituting the adhesive layer 4 remains in the resin film 2, and the silicone resin and the silicone adhesive component in the boundary portion of the main body 3 with the resin film 2. Are intermingled. Thereby, the resin film 2 and the main body 3 are firmly joined via the silicone adhesive.

  The silicone molded product 1 is made of a resin film 2 using an adhesive that is not a silicone adhesive, such as an acrylic resin adhesive, a urethane resin adhesive, an epoxy resin adhesive, a vinyl chloride resin solvent adhesive, and the like. By adhering to the other member, it can be firmly attached to the other member.

  FIG. 3 is a side view schematically showing a configuration in which the double-sided adhesive sheet 6 is provided on the other surface 5 of the resin film 2.

  A double-sided adhesive sheet 6 may be provided on the other surface 5 of the resin film 2, that is, the surface 5 opposite to the main body 3 side. The double-sided adhesive sheet 6 has, for example, a configuration in which adhesive layers 8 and 9 made of an adhesive are provided on both sides of a film-like substrate 7. One adhesive layer 8 is bonded to the other surface 5 of the resin film 2, and the adhesive layer 8 adheres to the other surface 5, whereby the double-sided adhesive sheet 6 is fixedly provided to the resin film 2. A release paper 10 is detachably bonded to the other adhesive layer 9.

  In this configuration, the silicone molded article 1 can be easily attached to the other member by peeling the release paper 10 and bonding the adhesive layer 9 of the double-sided adhesive sheet 6 to the other member.

  The shape of the silicone molded product 1 is not particularly limited as long as it can be manufactured by a manufacturing method described later. In the example shown in FIG. 1, the resin film 2 is formed in a substantially square shape, and the main body 3 is formed in a flat, substantially quadrangular prism shape. The side surface of the main body 3 is gently inclined so as to be located on the inner side as the distance from the resin film 2 increases. Moreover, the surface (side surface and upper surface) of the main body 3 does not have a cut surface generated by being cut with a blade or the like.

  FIG. 4 is a perspective view showing another example of the shape of the silicone molded product 1. FIG. 5 is a perspective view showing a use state of the silicone molded product 1 having the shape shown in FIG.

  As shown in FIG. 4, the silicone molded product 1 may be formed in a shape having a circular arc cross section and extending in the center line direction.

  The silicone molded product 1 having this shape can be attached to the handrail 11 by bonding the resin film 2 to the surface of the handrail 11 such as a corridor using an adhesive or a double-sided adhesive sheet 6.

  The material of the main body 3 may include a phosphorescent material (phosphorescent pigment). That is, a mixed material of a silicone resin and a phosphorescent material may be used as the material of the main body 3.

  By including a phosphorescent pigment in the material of the main body 3, the function of simple illumination can be exhibited at night. For example, when the silicone molded product 1 is attached to the handrail 11, the position of the handrail 11 can be guided even in the dark by the phosphorescence emitted from the silicone molded product 1. Moreover, the circumference | surroundings of the handrail 11 can be illuminated with the phosphorescence emitted from the silicone molded article 1, and the walk in the corridor etc. in which the handrail 11 was provided can be made safe.

  The phosphorescent material may be non-water-resistant in which the phosphorescence effect is reduced by hydrolysis when touched by moisture, or water-resistant or water-resistant that does not cause hydrolysis. Good. Examples of waterproof luminous pigments include “Standard Pigment: Luminesus CJ01” manufactured by Lumines Co., Ltd.

  When a mixed material of a silicone resin and a waterproof phosphorescent pigment is used as the material of the main body 3, the silicone molded article 1 has excellent water resistance and is suitable for use around water. For example, when the silicone molded product 1 is attached to the quay, the quay can be made conspicuous at night. Thereby, the safety | security at the time of a ship berthing can be improved. Further, the silicone molded product 1 can be used by being attached to a hull or a wet suit. Furthermore, it can also be used as a lure by attaching a fishing hook to the silicone molded product 1.

<Manufacturing method of silicone molded product>
6A, 6B, 6C, and 6D are perspective views showing a manufacturing process of the silicone molded product 1 having the shape shown in FIG.

  When the silicone molded product 1 is manufactured, as shown in FIG. 6A, a mold 22 having a recess 21 corresponding to the shape of the silicone molded product 1 is prepared. In the mold 22 for the silicone molded product 1 having the shape shown in FIG. 1, for example, a plurality of quadrangular recesses 21 in a plan view are formed in a matrix.

  Moreover, the material of the main body 3 and the resin film 2 in the raw material state are prepared.

  Thereafter, as shown in FIG. 6B, the material of the main body 3 is injected into the concave portion 21 of the mold 22, and the concave portion 21 is filled with the material of the main body 3 (injection step).

  Next, the resin film 2 is placed on the molding die 22 as shown in FIG. 6C with the material of the main body 3 uncured (arrangement step). At this time, the resin film 2 is disposed so that the adhesive layer 4 is directed to the molding die 22 and covers at least the entire surface of the material injected into each of the recesses 21.

  Then, the process (hardening process) of hardening the material in the recessed part 21 of the shaping | molding die 22 is implemented. In the process in which the material in the recess 21 is cured, a part of the components of the silicone-based adhesive constituting the adhesive layer 4 of the resin film 2 is mixed with the material in the recess 21. As a result, when the material in the recess 21 is cured, the main body 3 and the resin film 2 made of the cured material are integrated.

  After the curing step, a molded body composed of the plurality of main bodies 3 and the resin film 2 integrated therewith is taken out from the mold 22 (extraction step).

  Thereafter, as shown in FIG. 6D, a cutting blade 23 having a cutting edge having the same shape as the opening end of the concave portion of the mold is used to cut the resin film 2 along the outer shape of each main body 3 (cutting). Process). Thereby, the silicone molded product 1 is obtained.

  By this cutting step, even if the resin film 2 protrudes from the cured material, that is, the main body 3 of the silicone molded product, the protruding portion of the resin film 2 can be easily excised. And since the main body 3 of the silicone molded article 1 is not cut away, the main body 3 having no cut surface on the surface can be obtained.

<Effect>
As described above, the main body 3 mainly composed of silicone resin is formed on one surface of the resin film 2. Further, a silicone adhesive component is attached to one surface of the resin film 2. And in the boundary part with the resin film 2 in the main body 3, the silicone resin and the component of a silicone type adhesive are mixed. Therefore, the main body 3 and the resin film 2 are firmly bonded via the silicone-based adhesive.

  The resin film 2 is made of a resin that does not allow silicone oil to permeate. Therefore, even if silicone oil oozes out from the cured silicone pressure-sensitive adhesive, the silicone oil does not soak into the resin film 2 and does not ooze out to the other surface of the resin film 2 (surface opposite to the main body 3 side). Therefore, the other surface of the resin film 2 and another member can be firmly bonded with an adhesive. Since the main body 3 and the resin film 2 are firmly bonded, the other surface of the resin film 2 is firmly bonded to the other member, whereby the main body 3 is firmly attached (fixed) to the other member. ).

  In the silicone molded product 1, the main body 3 does not have a cut surface. Therefore, the silicone molded product 1 is suitable when the material for the main body 3 includes a phosphorescent material. That is, in the main body 3 using the mixed material of the silicone resin and the phosphorescent material, it is possible to prevent moisture from entering the main body 3 by not having a cut surface. Therefore, even if a non-water-resistant material is used for the phosphorescent material, deterioration of the phosphorescent material due to moisture can be suppressed. As a result, the degree of aging of the phosphorescent luminance of the phosphorescent material can be reduced, and the phosphorescent luminance of the phosphorescent material can be maintained high over a long period.

<Modification>
As mentioned above, although embodiment of this invention was described, this invention can also be implemented with another form.

  For example, in the above-described embodiment, when the silicone molded article 1 is manufactured, the resin film 2 in a raw material state is prepared. However, the step of preparing the resin film 2 is a resin in a raw material state prepared in advance. The process of preparing the film 2 may be sufficient, and the process of producing the resin film 2 by apply | coating a silicone type adhesive on the film which consists of resin of the property which does not permeate | transmit a silicone oil may be sufficient.

  Moreover, although some uses of the silicone molded article 1 were illustrated, the use is not limited, and the silicone molded article 1 can be used for various emblems of vehicles such as automobiles. .

  In addition, various design changes can be made to the above-described configuration within the scope of the matters described in the claims.

1 Silicone molded product 2 Resin film (film)
3 Body 4 Adhesive layer (silicone adhesive)
5 Other side 6 Double-sided adhesive sheet 8 Adhesive layer 9 Adhesive layer 10 Release paper 21 Recess 22 Forming die 23 Cutting blade

Claims (2)

An injection step of injecting a material mainly composed of silicone resin into the recess of the mold,
A film having a silicone-based adhesive on one side is prepared, and after the pouring step, the one side of the film faces the mold and covers at least the entire surface of the material poured into the recess. An arrangement process of arranging a film;
After the placing step, a curing step for curing the material in the recess,
After the said hardening process, the manufacturing method of a silicone molded article including the taking-out process which takes out the molded article which consists of the hardened material and the film integrated with the said material from a shaping | molding die. The method further includes a cutting step of cutting the film along the outer shape of the hardened material using a cutting blade whose blade edge is formed in the same shape as the open end of the concave portion of the mold after the removing step. Item 2. A method for producing a silicone molded article according to Item 1 .

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