JP4317827B2 - High release silicone rubber roll and method for producing the same - Google Patents

Description

  The present invention relates to a silicone rubber roll for preventing an adhesive composition or the like in a production process of an adhesive tape, a film and the like from sticking to a roll (rubber roll) in a production apparatus such as a film and an adhesive tape, and a method for producing the same.

  Adhesive tapes, adhesive sheets, films, and the like are used for various purposes in a wide range of fields such as commercial use, office use, and home use.

  In the drying process of the process of manufacturing a film, an adhesive tape, etc., the adhesive composition such as the film, the adhesive tape does not peel from the guide roll, the take-off roll, etc. in the manufacturing apparatus, and sticks (winds). There is a problem that the manufacturing apparatus stops. For this reason, rolls in which a release agent such as silicone oil is contained in roll materials such as guide rolls and take-off rolls to increase the non-tackiness imparting effect have been used conventionally. However, when the film or the pressure-sensitive adhesive composition comes into contact with the roll containing the release agent, the mold release agent adheres to the film or the pressure-sensitive adhesive composition, and the adhesive strength of the pressure-sensitive adhesive composition, the heat sealability of the film, the printability, There was a problem such as lowering.

  In order to solve such a problem, a material (sheet) provided with irregularities is conventionally adhered to the surface of the iron core to form irregularities on the surface of the roll, so that a film or an adhesive tape is wound around the roll. There have been ways to prevent it. However, this roll has a bonded joint (joint part), and the joint is displaced or peeled off from the joint as the roll is used. If the roll joint is displaced or peeled off, the roll cannot be used, and there has been a problem that the production line must be stopped and the film, adhesive tape or the like must be rewound. In addition, it is possible to eliminate the joint on the roll surface by laser processing or the like and to form a concavo-convex structure on the surface, but there is a problem that the processing apparatus that constitutes the concavo-convex structure is expensive and the manufacturing cost is high.

  There is also a method in which fine powder (particle size of less than 500 μm) is mixed with silicone rubber or the like to form irregularities on the roll surface. However, since the irregularities of the fine powder are small, a sufficient non-adhesive effect can be obtained. There was also a problem that it was not possible.

Furthermore, for example, Patent Document 1 provides a method of manufacturing a roll having an uneven shape by applying a coating base solution containing a powder filler. However, the particle size of the powder filler is limited, and the problem of obtaining a sufficient non-adhesive effect has not been solved.
Japanese Patent Application No. 2003-25350

  The present invention has been made in the circumstances as described above, and an object of the present invention is to provide a highly releasable silicone rubber roll to which an adhesive composition such as a film and an adhesive tape in a production process of a film and an adhesive tape does not adhere and its It is to provide a manufacturing method.

The present invention is a highly releasable silicone rubber roll characterized in that it has a particle layer whose surface is coated, adhered, and fixed with silicone rubber, and has a concavo-convex structure on the surface. A first silicone rubber layer made of liquid silicone rubber and having a thickness of 100 to 2000 μm on a roll-shaped substrate, and particles before the first silicone rubber layer is cured on the first silicone rubber layer A particle layer formed by coating particles having a diameter of 500 to 4000 μm , and a second silicone having a thickness obtained by curing liquid silicone rubber formed on the particle layer is 20 to 100% of the particle layer by have a stacked structure made by the rubber layer, is uneven structure is formed on the surface, and by joints not be effectively achieved.

The above-mentioned object of the present invention is to provide a first silicone rubber layer made of liquid silicone rubber having a thickness of 100 to 2000 μm and before the first silicone rubber layer is cured on the first silicone rubber layer. particle size and coating the particles of 500～4000Myuemu, curing the first silicone rubber layer, and grain child layer treated with a silane coupling agent surface, liquid silicone rubber formed on said particle layer by thickness formed by curing to have a stacked structure made by the second silicone rubber layer from 20 to 100 percent of the particle layer and the relief structure formed on the surface, and by joints it is not, some The particle layer is more effectively achieved by being made of glass beads.

The present invention is a method for producing a highly releasable silicone rubber roll, characterized in that it has a particle layer whose surface is coated, adhered and fixed with silicone rubber, and has a concavo-convex structure on the surface. purpose, a primer is applied to the roll-shaped substrate, a step of thickness consisting of liquid silicone rubber to form a first silicone rubber layer 100~2000μm on the substrate, wherein the first liquid silicone rubber Coating a glass bead having a particle size of 500 to 4000 μm before the layer is cured, forming a particle layer, curing the first silicone rubber layer, and subjecting the surface of the particle layer to a silane coupling treatment; Forming a second silicone rubber layer made of liquid silicone rubber on the silane coupling treated particle layer, and curing the liquid second silicone rubber layer; A method for producing a highly releasable silicone rubber roll, wherein the second silicone rubber layer is coated to have a thickness of 20 to 100% of the particle layer, whereby an uneven structure is formed on the surface, And it is achieved effectively by the absence of joints .

  Further, the object of the present invention is to apply a primer containing a silane compound instead of the silane coupling treatment in the step of curing the first silicone rubber layer and subjecting the surface of the particle layer to a silane coupling treatment. This can also be achieved effectively.

  According to the highly releasable silicone rubber roll of the present invention, a film, an adhesive tape, etc. can be produced without reducing the adhesive strength of an adhesive composition such as an adhesive tape, the corona treatment strength of the film, and the printability. It became so. Moreover, since the silicone rubber layer is further formed on the particle layer in the highly releasable silicone rubber roll of the present invention, a material (rubber sheet) provided with unevenness as in the prior art is adhered to the iron core surface. There is no joint like a roll with irregularities formed on the roll surface. Therefore, the problem that the joint is displaced as the roll is used, or the joint becomes a starting point and peels off has been solved. Further, according to the production method of the present invention, a high releasable silicone rubber roll can be produced at low cost.

  The highly releasable silicone rubber roll of the present invention has a structure in which a first silicone rubber layer, a particle layer, and a second silicone rubber layer are laminated in this order on a substrate. Thereby, a film, an adhesive tape, etc. came to be manufactured, without reducing adhesive force, such as a film and an adhesive tape. Hereinafter, the highly releasable silicone rubber roll of the present invention will be described in detail.

  FIG. 1 is a cross-sectional view of a highly releasable silicone rubber roll of the present invention. The highly releasable silicone rubber roll of the present invention is laminated on a roll-shaped substrate 1 in the order of a first silicone rubber layer 3, a particle layer 4 and a second silicone rubber layer 5. The substrate 1 and the first silicone rubber layer 3 are bonded via the primer 2.

  If the base material 1 is roll shape (cylindrical shape), a material will not be specifically limited, For example, it consists of well-known various materials, such as a metal core, a plastic core, and a rubber core. As the primer 2, various known primers such as a metal primer can be used.

  The first silicone rubber layer 3 is adhered by the primer 2 applied on the substrate 1. The first silicone rubber layer 3 uses liquid silicone rubber, and the material is not particularly limited as long as it is liquid silicone rubber. The thickness of the first silicone rubber layer 3 is preferably 100 μm or more, and more preferably 200 to 2000 μm. If the thickness of the first silicone rubber layer 3 is less than 100 μm, the particle layer 4 on the first silicone rubber layer 3 cannot be fixed.

  On the first silicone rubber layer 3, a particle layer 4 covered with particles is formed. By providing the particle layer 4, irregularities are formed on the roll, and the surface area around which the adhesive composition such as a film or an adhesive tape is wound is reduced, so that the adhesive composition can be effectively prevented from being wound. The particle diameter is preferably 500 to 4000 μm. When the particle size of the particles is less than 500 μm, the unevenness of the roll surface is reduced and the non-tackifying effect is lost. On the other hand, when the particle diameter exceeds 4000 μm, the roll cannot be formed.

  The material used for the particle layer 4 is not particularly limited as long as the particle size is 500 to 4000 μm. For example, glass beads, aluminum oxide (alumina), silicon carbide, olefin beads, heat resistant resin filler For example, various known particles can be used. In view of the stability of the particle distribution, the adhesion to the first silicone rubber layer 3 and the cost, it is particularly preferable to use glass beads as the particles used for the particle layer 4.

  Before forming the second silicone rubber layer 5 on the particle layer 4, the surface of the particle layer 4 is treated with a silane coupling agent. By treating the particle layer 4 with the silane coupling agent, the adhesive strength with the second silicone rubber layer 5 is increased, and the problem that the particles are less likely to drop off and the unevenness is eliminated is solved. As the silane coupling agent used in the present invention, for example, various known silane coupling agents such as aminosilane, epoxysilane, and ethoxysilane can be used. In addition, these silane coupling agents may be used alone or in combination. Alternatively, the second silicone rubber layer 5 may be formed after a primer containing a silane compound or a silane coupling agent is applied to the particle layer 4.

  After the surface of the particle layer 4 is subjected to silane coupling treatment, a second silicone rubber layer 5 is formed on the particle layer 4. Thereby, the 2nd silicone rubber layer 5 can adhere | attach (bond | couple) firmly with the particle | grain layer 4 and a silane coupling agent, and can prevent that a particle | grain omission does not disappear. The second silicone rubber layer 5 uses liquid silicone rubber in the same manner as the first silicone rubber layer 3, and the material is not particularly limited as long as it is liquid silicone rubber. In addition, it is preferable that the thickness of the second silicone rubber layer 5 is 20 to 100% of the thickness of the particle layer 4 subjected to the silane coupling treatment. By setting the thickness of the second silicone layer 5 to be in such a range, it becomes possible to provide a highly releasable silicone rubber roll without a joint. If the thickness of the second silicone rubber layer 5 is less than 20% of the thickness of the particle layer 4, the particle layer 4 cannot be covered with the second silicone rubber layer 5, and the particles may fall off. is there. On the other hand, when the thickness of the second silicone rubber layer 5 exceeds 100% of the thickness of the particle layer 4, the unevenness formed by the particle layer 4 is lost.

  Next, the manufacturing method of the high releasable silicone rubber roll of this invention is demonstrated in detail.

  FIG. 2 is a flowchart showing the flow of the method for producing a highly releasable silicone rubber roll of the present invention. In the production method of the present invention, the primer 2 is applied on the substrate 1 to form the first silicone rubber layer 3 (step 11), and the particles are coated before the first silicone rubber layer 3 is cured. A step of forming the layer 4 (step 12), a step of silane coupling treatment of the surface of the particle layer 4 after the curing of the first silicone rubber layer (step 13), and a second silicone rubber layer after completion of the silane coupling treatment. 5 (step 14).

  In step 11, the primer 2 is applied on a roll-shaped base material 1 made of various known materials such as a metal core, a plastic core, and rubber to form a first silicone rubber layer 3. As the method for forming the first silicone rubber layer 3, the first silicone rubber layer 3 can be formed by various known methods such as coating and spraying. Further, the application amount of the primer 2 is not particularly limited as long as the base material 1 and the first silicone rubber layer 3 are not peeled off.

  The first silicone rubber layer 3 uses liquid silicone rubber, and the material is not particularly limited as long as it is liquid silicone rubber. The thickness of the first silicone rubber layer 3 is preferably 100 μm or more, and more preferably 200 to 2000 μm. If the thickness of the first silicone rubber layer 3 is less than 100 μm, the particle layer 4 on the first silicone rubber layer 3 cannot be fixed. In addition, although 2000 micrometers or more may be sufficient, there exists a possibility that a roll cannot be formed.

  After step 11, the particles are coated before the first silicone rubber layer 3 formed on the substrate 1 is cured (step 12). The particle size of the particles coated on the first silicone rubber layer 3 is preferably 500 to 4000 μm. When the particle size is less than 500 μm, the unevenness of the roll surface is reduced and the non-tackifying effect is lost. On the other hand, when the particle size exceeds 4000 μm, it becomes impossible to mold the roll. While rotating the base material 1 on which the first silicone rubber layer 3 before curing is formed such that particles having a particle size of 500 to 4000 μm cover the entire first silicone rubber layer 3, an opening of 500 to 4000 μm The particles having the above are vibrated to coat the particles on the surface of the first silicone rubber layer 3, and the first silicone rubber layer 3 is cured to form the particle layer 4. When the particles are coated after the first silicone rubber layer 3 is cured, the particles are not fixed.

  After the first silicone rubber layer 3 is cured, the surface of the particle layer 4 is subjected to a silane coupling treatment with a silane coupling agent (step 13). As the silane coupling agent used in the present invention, for example, various known silane coupling agents such as aminosilane, epoxysilane, and ethoxysilane can be used. In addition, these silane coupling agents may be used alone or in combination. The amount of the silane coupling agent used can be appropriately changed according to the size, purpose and the like. In addition, you may apply | coat the primer containing a silane compound or a silane coupling agent on the surface of the particle layer 4 instead of a silane coupling agent.

  After the surface of the particle layer 4 is subjected to silane coupling treatment, a second silicone rubber layer 5 is formed on the particle layer 4 and cured (step 14). Thereby, the 2nd silicone rubber layer 5 can adhere | attach (bond | couple) firmly with the particle | grain layer 4 and a silane coupling agent, and can prevent that a particle | grain omission does not disappear. The liquid silicone rubber is used in the same manner as the first silicone rubber layer 3, and the material is not particularly limited as long as it is a liquid silicone rubber. As a method of forming the second silicone rubber layer 5, the second silicone rubber layer 5 can be formed by various known processing methods such as coating and spraying. Coating or spraying is performed until the thickness of the second silicone rubber layer 5 becomes 20 to 100% of the thickness of the particle layer 4 subjected to the silane coupling treatment. If the thickness of the second silicone rubber layer 5 is less than 20% of the thickness of the particle layer 4, the particle layer 4 cannot be covered with the second silicone rubber layer 5, and the particles may fall off. is there. On the other hand, when the thickness of the second silicone rubber layer 5 exceeds 100% of the thickness of the particle layer 4, the unevenness formed by the particle layer 4 is lost.

  As mentioned above, although this invention was demonstrated in detail, this invention is not limited to these. For example, the first silicone rubber layer 3 and the second silicone rubber layer 5 may be changed to plastic, heat resistant resin, various rubbers, and the like.

  Examples of the present invention will be described in detail below, but the present invention is not limited thereto.

  The metal core 2 was applied to the outer periphery of the base material 1 using the core metal as the base material 1 to form the first silicone rubber layer 3. Before the first silicone rubber layer 3 is cured, the base material on which the first silicone rubber layer 3 is formed by applying vibrations to particles having a particle size of 800 to 1000 μm and an opening having the same size as the particle size. While rotating 1, the entire first silicone rubber layer 3 was coated with glass beads. Thereafter, in order to fix the particles, the first silicone rubber layer 3 was cured to form a particle layer 4 (glass bead layer).

  A primer containing aminosilane (silane coupling agent) was applied to the surface of the particle layer 4, and silane coupling treatment was performed. The particle layer 4 subjected to the silane coupling treatment is coated with the second silicone rubber layer 5 until it becomes 80% of the thickness of the particle layer 4, the second silicone rubber layer 5 is cured, and there is no joint on the roll surface. A highly releasable silicone rubber roll of the present invention was produced.

  In order to test the releasability between the highly releasable silicone rubber roll of the present invention produced in Example 1 and the adhesive composition of the adhesive tape, the high releasable silicone rubber roll of the present invention was brought into contact with the film. Then, the highly releasable silicone rubber roll and the adhesive tape were peeled off, and the peeling force was measured using a measuring instrument (autograph AGS-H manufactured by Shimadzu Corporation).

As a comparative example, a conventionally used roll (hereinafter referred to as Comparative Sample 1) to which a release agent was added and an embossed tape-attached roll (hereinafter referred to as Comparative Sample 2) were also tested in the same manner. The pressure-sensitive adhesive tape used in the peel force test is a flow glass sheet AGF-500-6 (manufactured by Chuko Kasei Co., Ltd.). The test results are shown in Table 1.

表１から明らかであるように、本発明の高離型性シリコーンゴムロールは、粘着テープが全く貼りつかず剥離力を測定することができなかった。すなわち、非粘着性付与が大きいことがわかる。

As is clear from Table 1, the high release silicone rubber roll of the present invention was not able to measure the peeling force because the adhesive tape was not attached at all. That is, it can be seen that the non-tackiness imparting is large.

  On the other hand, the comparative sample 1 is 15 N / mm, the comparative sample 2 is 3 N / mm, and the peeling force with the adhesive composition of the adhesive tape is observed, and non-adhesiveness is imparted compared to the highly releasable silicone rubber roll of the present invention. I understand that it is small.

It is sectional drawing of the high releasable silicone rubber roll of this invention. It is a flowchart which shows the flow of the manufacturing method of the high release silicone rubber roll of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base material 2 Primer 3 1st silicone rubber layer 4 Particle layer 5 2nd silicone rubber layer

Claims (5)

A first silicone rubber layer made of liquid silicone rubber and having a thickness of 100 to 2000 μm on a roll-shaped substrate, and particles before the first silicone rubber layer is cured on the first silicone rubber layer A particle layer formed by coating particles having a diameter of 500 to 4000 μm and curing the first silicone rubber layer, and a thickness formed by curing liquid silicone rubber formed on the particle layer. of by it has a stacked structure made by the second silicone rubber layer from 20 to 100% is relief structure formed on the surface, and high releasability silicone rubber rolls, wherein the joint is not. A first silicone rubber layer made of liquid silicone rubber having a thickness of 100 to 2000 μm on a roll-shaped substrate, and particles before the first silicone rubber layer is cured on the first silicone rubber layer diameter coated particles 500～4000Myuemu, curing the first silicone rubber layer, and grain child layer treated with a silane coupling agent surface, the liquid silicone rubber formed on said particle layer by thickness formed by curing to have a stacked structure made by the second silicone rubber layer from 20 to 100% of said particle layer, the surface relief structure is formed in, and wherein the joint is not High release silicone rubber roll.   The highly releasable silicone rubber roll according to claim 1, wherein the particle layer is made of glass beads. Primers were applied to the roll-shaped substrate, a step of thickness consisting of liquid silicone rubber on the substrate to form a first silicone rubber layer of 100 to 2000, the first silicone rubber layer of the liquid is cured A step of coating glass beads having a particle diameter of 500 to 4000 μm before forming, a step of forming a particle layer, a step of curing the first silicone rubber layer and subjecting the surface of the particle layer to a silane coupling treatment, and the silane Forming a second silicone rubber layer made of liquid silicone rubber on the particle layer subjected to the coupling treatment, and curing the liquid second silicone rubber layer, and a method for producing a highly releasable silicone rubber roll comprising: The second silicone rubber layer is coated to have a thickness of 20 to 100% of the particle layer, thereby forming a concavo-convex structure on the surface. A process for producing a highly releasable silicone rubber roll, characterized in that it has no joints .   5. The primer containing a silane compound is applied instead of the silane coupling treatment in the step of curing the first silicone rubber layer and subjecting the surface of the particle layer to a silane coupling treatment. A process for producing a highly releasable silicone rubber roll as described in 1.

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