JP7269059B2 - VISCOELASTIC BODY AND METHOD FOR MANUFACTURING SAME - Google Patents
VISCOELASTIC BODY AND METHOD FOR MANUFACTURING SAME Download PDFInfo
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- JP7269059B2 JP7269059B2 JP2019058322A JP2019058322A JP7269059B2 JP 7269059 B2 JP7269059 B2 JP 7269059B2 JP 2019058322 A JP2019058322 A JP 2019058322A JP 2019058322 A JP2019058322 A JP 2019058322A JP 7269059 B2 JP7269059 B2 JP 7269059B2
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- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 238000000034 method Methods 0.000 title description 4
- 239000006260 foam Substances 0.000 claims description 39
- 239000011324 bead Substances 0.000 claims description 17
- 239000000853 adhesive Substances 0.000 claims description 11
- 230000001070 adhesive effect Effects 0.000 claims description 11
- 238000005187 foaming Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000010410 layer Substances 0.000 description 37
- 239000000499 gel Substances 0.000 description 15
- 229920001296 polysiloxane Polymers 0.000 description 12
- 238000011156 evaluation Methods 0.000 description 10
- 239000007788 liquid Substances 0.000 description 10
- 238000002156 mixing Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 239000000428 dust Substances 0.000 description 7
- 239000000835 fiber Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 229920002545 silicone oil Polymers 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 239000000454 talc Substances 0.000 description 4
- 229910052623 talc Inorganic materials 0.000 description 4
- 229920000298 Cellophane Polymers 0.000 description 3
- 239000004005 microsphere Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- -1 polydimethylsiloxane Polymers 0.000 description 3
- 230000037303 wrinkles Effects 0.000 description 3
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000003094 microcapsule Substances 0.000 description 2
- 125000005375 organosiloxane group Chemical group 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 230000001588 bifunctional effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
- 239000000017 hydrogel Substances 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 229920003216 poly(methylphenylsiloxane) Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011359 shock absorbing material Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
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Description
本発明は、粘弾性体およびその製造方法に関する。 The present invention relates to a viscoelastic body and its manufacturing method.
粘性が高く、柔らかい粘弾性体は、同時に粘着性も有しているため、他の物体に接着させて使用する場合、接着剤が不要という利点がある。その反面、表面にホコリ（埃）などが付着しやすく、一旦付着すると除去することが難しいという問題があった。加えて、異物の付着を防止するためには、粘着面を保護フィルムなどで覆う必要があり、作業性が低下するという問題もあった。さらに、粘弾性体の接着力の向上のために、接着剤を表面に塗布する必要が生じても、シリコーンからなる粘弾性体では接着剤が限られてしまうという問題があった。そこで、表面の粘着性を低下させ、ホコリ等の付着がしにくく、様々な接着材が使用できる表面を持つ粘弾性体が求められていた。 A viscoelastic body that is highly viscous and soft has adhesiveness at the same time, and thus has the advantage of not requiring an adhesive when it is used by adhering it to another object. On the other hand, there is a problem that dust or the like easily adheres to the surface, and once adhered, it is difficult to remove. In addition, in order to prevent adhesion of foreign substances, it is necessary to cover the adhesive surface with a protective film or the like, and there is also a problem that workability is lowered. Furthermore, even if it becomes necessary to apply an adhesive to the surface in order to improve the adhesive force of the viscoelastic body, there is a problem that the adhesive is limited for the viscoelastic body made of silicone. Therefore, there has been a demand for a viscoelastic body having a surface that reduces the adhesiveness of the surface, makes it difficult for dust and the like to adhere, and allows the use of various adhesives.
粘弾性体の粘着性を低下させるため、粘弾性体の表面に、含水ケイ酸アルミニウム（タルク）等の粉末を付着させるという方法が知られている。しかしながら、粘弾性体が衝撃、振動、磨耗等を受けた際に該粉末が脱落、粉落ちするという問題がある。 In order to reduce the adhesiveness of the viscoelastic body, a method is known in which powder such as hydrated aluminum silicate (talc) is adhered to the surface of the viscoelastic body. However, when the viscoelastic body is subjected to impact, vibration, abrasion, etc., there is a problem that the powder falls off or falls off.
粘弾性体の表面に、造膜層を設けるという方法が知られている（特許文献１～３）。しかしながら、粘弾性体と造膜した膜の伸び率を同じにすることは難しいという問題がある。そのため、造膜層を設けた粘弾性体を伸び縮みさせた際に、膜の伸びが粘弾性体の伸びより小さい場合、膜が割れ、粘弾性体が破壊されることになり、膜の伸びが粘弾性体より大きい場合、膜にシワが発生することになる。
A method of providing a film-forming layer on the surface of a viscoelastic body is known (
粘弾性体の表面に、シリコーン系のオイル等を塗布する方法が知られている。しかしながら、粘弾性体の粘着性を弱くすることはできるが、粘弾性体表面の表面張力を下げてしまうため、使用できる接着剤や両面テープが限られるという問題がある。 A method of applying silicone-based oil or the like to the surface of a viscoelastic body is known. However, although the adhesiveness of the viscoelastic body can be weakened, the surface tension of the surface of the viscoelastic body is lowered, so there is a problem that the adhesives and double-sided tapes that can be used are limited.
本発明は、表面にホコリが付着しにくく、様々な両面テープや接着剤を塗布できる表面を有する粘弾性体を提供することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide a viscoelastic body having a surface on which dust is less likely to adhere and on which various double-sided tapes and adhesives can be applied.
本発明は、粘弾性体表面に発泡層を有し、両者の界面が凹凸形状である粘弾性体に関する。 TECHNICAL FIELD The present invention relates to a viscoelastic body having a foam layer on the surface of the viscoelastic body and an uneven interface between the two.
界面の最深部の基準点から、界面までの厚み方向の最大長さが２０μｍ以上であることが好ましい。 The maximum length in the thickness direction from the reference point at the deepest part of the interface to the interface is preferably 20 μm or more.
表面に、膜厚が不均一な発泡層を有することが好ましい。 It is preferable that the surface has a foamed layer with a non-uniform film thickness.
長さ１ｍｍの発泡層において、最小厚さに対する最大厚さが１５０％以上であることが好ましい。 It is preferable that the maximum thickness relative to the minimum thickness is 150% or more in the foamed layer having a length of 1 mm.
発泡層の平均膜厚が粘弾性体全体の厚さの１０％以下であることが好ましい。 The average thickness of the foam layer is preferably 10% or less of the thickness of the entire viscoelastic body.
発泡層が、発泡ビーズから形成された単泡であることが好ましい。 It is preferred that the foam layer is a single cell formed from foam beads.
発泡層と粘弾性体の間に粘着剤を含まないことが好ましい。 It is preferable not to include an adhesive between the foam layer and the viscoelastic body.
また、本発明は、粘弾性体の表面に発泡ビーズを付着させる工程、および、
得られた粘弾性体を加熱して発泡させる工程
を含む粘弾性体の製造方法に関する。
Further, the present invention provides a step of attaching foamed beads to the surface of a viscoelastic body, and
The present invention relates to a method for producing a viscoelastic body, including a step of heating and foaming the obtained viscoelastic body.
本発明の粘弾性体では、発泡層は粘弾性体に喰い込むように付着し、発泡層と粘弾性体の界面が平面ではなく凹凸形状をしている。そのため、発泡体と粘弾性体との接触面積が大きくなり、発泡層を構成する発泡体の粉落ちをなくすことができ、伸び縮みさせた際のシワ等の発生を防止することができる。また、発泡層は粘着性を持たず、表面張力が高いため、ホコリ等が付着しても払い落とすことができ、使用できる接着材や両面テープの制限をなくすことができる。 In the viscoelastic body of the present invention, the foam layer adheres to the viscoelastic body so as to bite into it, and the interface between the foam layer and the viscoelastic body is uneven rather than flat. Therefore, the contact area between the foam and the viscoelastic body is increased, so that the foam forming the foam layer can be prevented from falling off, and wrinkles and the like can be prevented from occurring when the foam is expanded and contracted. Moreover, since the foam layer has no stickiness and has high surface tension, even if dust or the like adheres to it, it can be brushed off.
本発明の粘弾性体は、粘弾性体表面に発泡層を有し、両者の界面が凹凸形状であることを特徴とする。発泡層は、粘弾性体の片面のみに形成しても、両面に形成しても良い。 The viscoelastic body of the present invention is characterized by having a foam layer on the surface of the viscoelastic body and having an uneven interface between the two. The foam layer may be formed only on one side of the viscoelastic body, or may be formed on both sides.
粘弾性体の材質は特に限定されず、ウレタンゲル、シリコーンゲル、ハイドロゲルなどが挙げられる。なかでも、長期的な使用において溶媒の揮発が生じ難い点で、ウレタンゲル、シリコーンゲルが好ましい。 The material of the viscoelastic body is not particularly limited, and examples thereof include urethane gel, silicone gel, and hydrogel. Among them, urethane gel and silicone gel are preferable because the solvent is less likely to volatilize during long-term use.
シリコーンゲルとしては、２官能のオルガノシロキサンと３官能のオルガノシロキサンを反応させて架橋することにより得ることができる。シロキサンゲルが立体網目構造を形成し、この立体網目構造の間にシリコーンオイルが担持された構造を有する。シロキサンゲルとしては、たとえばポリジメチルシロキサンゲル、ポリメチルトリフルオロプロピルシロキサンゲル、ポリフェニルメチルシロキサンゲルなどとシリコーンオイルで構成された粘弾性体が特に好ましい。シリコーンオイルとしては、たとえばジメチルシリコーンオイル、メチルフェニルシリコーンオイル、アミノ変性シリコーンオイル、エポキシ変性シリコーンオイルなどが挙げられる。 A silicone gel can be obtained by reacting a bifunctional organosiloxane and a trifunctional organosiloxane to form a crosslink. The siloxane gel forms a three-dimensional network structure, and has a structure in which silicone oil is carried between the three-dimensional network structures. As the siloxane gel, a viscoelastic body composed of, for example, polydimethylsiloxane gel, polymethyltrifluoropropylsiloxane gel, polyphenylmethylsiloxane gel, etc. and silicone oil is particularly preferable. Examples of silicone oil include dimethylsilicone oil, methylphenylsilicone oil, amino-modified silicone oil, and epoxy-modified silicone oil.
両者の界面が凹凸形状であるとは、界面が平滑な平面ではないことをいう。平滑な平面ではないため、発泡層と粘弾性体との接触面積は大きくなり、両者の接着性は高く、接着層を設けなくても発泡層の剥がれなく、両者が強固に接着する。 That the interface between the two has an uneven shape means that the interface is not a smooth plane. Since the surface is not smooth, the contact area between the foam layer and the viscoelastic body is large, and the adhesion between the two is high.
凹凸形状とは、発泡層と粘弾性体の界面の最深部の基準点から、界面までの厚み方向の最大長さがある程度の長さを有することを意味する。図４は、発泡層と粘弾性体の界面の最深部の基準点から、界面までの厚み方向の長さの説明図である。粘弾性体の厚さ方向に最も深く位置する界面の最深部３に対して、厚さ方向の長さ４が最も大きい部分である。その長さは２０μｍ以上が好ましく、４０μｍ以上がより好ましい。２０μｍ未満では、 発泡層は十分な凹凸形状ではないため、粘弾性体に対しての喰い込みが不足し粘弾性体と強固に接着せず、部分的に粉落ちしやすくなる傾向がある。長さの上限は特に限定されないが、３００μｍ以下が好ましい。なお、最大長さの算出において、１ｍｍ以上の界面長さを測定する必要がある。
The uneven shape means that the maximum length in the thickness direction from the deepest reference point of the interface between the foam layer and the viscoelastic body to the interface has a certain length. FIG. 4 is an explanatory diagram of the length in the thickness direction from the deepest reference point of the interface between the foam layer and the viscoelastic body to the interface. It is the portion with the
発泡層の膜厚は不均一であることが好ましい。不均一であるため、発泡層と粘弾性体の界面に凹凸形状が形成され、接触面積が大きくなって粘弾性体に強固に接着する。ここで、不均一とは、発泡層の厚さが一定ではないことを言う。長さ１ｍｍの発泡層の最小厚さに対する最大厚さは、１５０％以上が好ましく、２００％以上がより好ましく、３００％以上がさらに好ましい。１５０％未満では、発泡層の凹凸形状は浅くなり粘弾性体に対しての喰い込みが不足し粘弾性体と強固に接着しない傾向がある。上限は特に限定されないが、５００％以下が好ましい。 The thickness of the foam layer is preferably non-uniform. Since the foam layer and the viscoelastic body are non-uniform, an uneven shape is formed at the interface between the foam layer and the viscoelastic body, and the contact area increases to firmly adhere to the viscoelastic body. Here, the non-uniformity means that the thickness of the foam layer is not constant. The maximum thickness with respect to the minimum thickness of the 1 mm-long foam layer is preferably 150% or more, more preferably 200% or more, and even more preferably 300% or more. If it is less than 150%, the uneven shape of the foamed layer becomes shallow, and there is a tendency that it does not sufficiently bite into the viscoelastic body and does not firmly adhere to the viscoelastic body. Although the upper limit is not particularly limited, it is preferably 500% or less.
発泡層の平均膜厚は特に限定されないが、５０～３００μｍが好ましく、７０～２００μｍがより好ましい。５０μｍ未満では、発泡層の最小厚さの部分が脱落しやすくなる可能性があり、３００μｍを超えると、発泡層の最大厚さの部分が粘弾性体に対し追従性が悪くなる傾向がある。ここで、平均膜厚は、マイクロスコープによって計測した面積および長さから計算（面積÷長さ）する。 The average thickness of the foam layer is not particularly limited, but is preferably 50 to 300 μm, more preferably 70 to 200 μm. If the thickness is less than 50 μm, the minimum thickness portion of the foam layer may easily fall off. Here, the average film thickness is calculated from the area and length measured with a microscope (area/length).
また、発泡層の平均膜厚は、粘弾性体全体の厚さの１０％以下が好ましく、５％以下がより好ましい。１０％を超えると、発泡層が厚いため粘弾性体への追従性が悪くなる傾向がある。下限は特に限定されないが、０．５％以上が好ましい。 Moreover, the average film thickness of the foam layer is preferably 10% or less, more preferably 5% or less, of the total thickness of the viscoelastic body. If it exceeds 10%, the foam layer will be thick and will tend to have poor followability to the viscoelastic body. Although the lower limit is not particularly limited, it is preferably 0.5% or more.
粘弾性体全体の厚さは特に限定されないが、１．０ｍｍ以上が好ましく、３．０ｍｍ以上がより好ましい。１．０ｍｍ未満では、粘弾性体の粘性成分が十分得られない傾向となる。上限は特に限定されないが２０ｍｍ以内が好ましい。 Although the thickness of the entire viscoelastic body is not particularly limited, it is preferably 1.0 mm or more, more preferably 3.0 mm or more. If it is less than 1.0 mm, the viscous component of the viscoelastic body tends to be insufficient. Although the upper limit is not particularly limited, it is preferably within 20 mm.
発泡層の作製方法は特に限定されないが、発泡ビーズを発泡させることが好ましい。ここで、発泡ビーズとは、たとえば、熱可塑性樹脂を殻として内部に空気等の気体を含有し、熱により膨張して微小中空粒子を形成するものである。例えば、熱で膨張するものとしては、７０～２５０℃で膨張し、直径が１．５倍以上、体積が約２～１５０倍以上となるものが挙げられる。 Although the method for producing the foam layer is not particularly limited, it is preferable to foam foam beads. Here, the foamed bead is, for example, a shell made of a thermoplastic resin, containing a gas such as air therein, and expanded by heat to form fine hollow particles. For example, those that expand with heat include those that expand at 70 to 250° C. and have a diameter of 1.5 times or more and a volume of about 2 to 150 times or more.
具体的な発泡ビーズとしては、たとえば、マツモトマイクロスフェアー（松本油脂製薬株式会社製）、エクスパンセル（日本フィライト株式会社製）、アドバンセル（積水化学工業株式会社製）、クレハマイクロスフェアー（株式会社クレハ製）などが挙げられる。 Specific foamed beads include, for example, Matsumoto Microsphere (manufactured by Matsumoto Yushi Seiyaku Co., Ltd.), Expancel (manufactured by Nippon Philite Co., Ltd.), Advancel (manufactured by Sekisui Chemical Co., Ltd.), Kureha Microsphere (manufactured by Sekisui Chemical Co., Ltd.). manufactured by Kureha Co., Ltd.).
発泡ビーズの粒径は特に限定されないが、１～８０μｍが好ましく、５～５０μｍがより好ましい。１μｍ未満では、膨張後の発泡ビーズの発泡層の凹凸形状は浅くなり、弾性体に対しての喰い込みが不足し粘弾性体と強固に接着しない傾向がある。一方、８０μｍを超えると、発泡ビーズの膨張ムラが起こりやすくなることや、膨張後の発泡層の最大厚さの部分が粘弾性体に対し追従性が悪くなる傾向がある。 The particle size of the expanded beads is not particularly limited, but is preferably 1 to 80 μm, more preferably 5 to 50 μm. If the thickness is less than 1 μm, the foamed layer of the foamed beads after expansion has a shallow uneven shape, and there is a tendency that it does not sufficiently bite into the elastic body and does not firmly adhere to the viscoelastic body. On the other hand, if the thickness exceeds 80 μm, uneven expansion of the foamed beads tends to occur, and the maximum thickness of the foamed layer after expansion tends to deteriorate the conformability to the viscoelastic body.
発泡倍率は特に限定されないが、２～３５０倍が好ましく、２～１００倍がより好ましい。２倍未満では、膨張後の発泡ビーズの発泡層の凹凸形状は浅くなり、弾性体に対しての喰い込みが不足し粘弾性体と強固に接着しない傾向がある。一方、３５０倍を超えると、発泡ビーズの膨張ムラが起こりやすくなることや、膨張後の発泡層の最大厚さの部分が粘弾性体に対し追従性が悪くなる傾向がある。 The expansion ratio is not particularly limited, but is preferably 2 to 350 times, more preferably 2 to 100 times. If it is less than 2 times, the uneven shape of the foamed layer of the foamed beads after expansion becomes shallow, and there is a tendency that it does not sufficiently bite into the elastic body and does not firmly adhere to the viscoelastic body. On the other hand, if it exceeds 350 times, uneven expansion of the foamed beads tends to occur, and the maximum thickness of the foamed layer after expansion tends to have poor followability to the viscoelastic body.
また、本発明の粘弾性体の製造方法は、
粘弾性体の表面に発泡ビーズを付着させる工程、および、
得られた粘弾性体を加熱して発泡させる工程
を含むことを特徴とする。本発明の製造方法によって、前述した本発明の粘弾性体を作製することができる。
Further, the method for producing a viscoelastic body of the present invention comprises:
a step of adhering foamed beads to the surface of the viscoelastic body; and
It is characterized by including a step of heating and foaming the obtained viscoelastic body. The viscoelastic body of the present invention described above can be produced by the production method of the present invention.
粘弾性体の表面に発泡ビーズを付着させる工程において、粘弾性体は粘着性を有しているため、発泡ビーズを接触させるだけで表面に付着する。付着させる量は特に限定されないが、粘弾性体の表面全体に付着させることができる量であれば問題ない。 In the step of adhering the foamed beads to the surface of the viscoelastic body, the viscoelastic body has stickiness, so that the foamed beads are attached to the surface only by contacting the viscoelastic body. The amount to be adhered is not particularly limited, but there is no problem as long as the amount can be adhered to the entire surface of the viscoelastic body.
粘弾性体を加熱して発泡させる温度は特に限定されず、使用する発泡ビーズを発泡させるのに最適な発泡応温度であれば問題ないが、５０～３２０℃が好ましく、７０～２５０℃がより好ましい。５０℃未満では、発泡ビーズの発泡開始温度に到達せず十分な発泡が得られず、３２０℃を超えると、発泡ビーズが発泡倍率の上限と超えて逆に収縮してしまう傾向がある。 The temperature for heating and foaming the viscoelastic body is not particularly limited, and there is no problem as long as it is the optimum foaming reaction temperature for foaming the foamed beads used. preferable. If the temperature is less than 50°C, the foaming start temperature of the foamed beads cannot be reached and sufficient foaming cannot be obtained.
本発明の粘弾性体の用途は特に限定されないが、制振材、防振材、防音材、遮熱材、電磁波シールド材、緩衝材、衝撃吸収材等が挙げられる。
Applications of the viscoelastic body of the present invention are not particularly limited, but examples thereof include vibration damping materials, vibration isolating materials, sound insulating materials, heat insulating materials, electromagnetic wave shielding materials, cushioning materials, and impact absorbing materials.
以下、実施例について説明するが、本発明はこれらの実施例のみに限定されるものではない。 Examples will be described below, but the present invention is not limited only to these examples.
実施例１
シリコーンゲルの原料となる２液（信越化学工業株式会社製ＫＥ－１０５２ Ａ液Ｂ液）の配合比率を調整し混ぜ合わせた後、恒温乾燥機にて（２３℃、２４時間）架橋させて粘弾性体を作製した。この粘弾性体の表面に熱膨張性マイクロカプセル（松本油脂製薬株式会社製、マツモトマイクロスフェアーＦ－４８Ｄ、平均粒径９μｍ）０．１ｇを、粘弾性体自身の粘着性を利用して粘弾性体表面に薄く均一に塗布し、恒温乾燥機にて（１１０℃、１時間）マイクロカプセルを発泡させた。発泡倍率は３倍であった。粘弾性体の厚さは４ｍｍ、幅および長さはともに５０ｍｍで、重量は１０．７ｇであった。粘弾性体の切断面を光学顕微鏡で観察したものを図１に、粘弾性体の表面を観察したものを図２に示す。発泡層の平均膜厚は１２０μｍであり、発泡層の平均膜厚は、粘弾性体全体の厚さの３％であった。
Example 1
After adjusting the blending ratio of the two liquids (KE-1052 A liquid B manufactured by Shin-Etsu Chemical Co., Ltd.) and mixing them, which are the raw materials of the silicone gel, they are crosslinked (23 ° C., 24 hours) in a constant temperature dryer to make the viscosity. An elastic body was produced. On the surface of this viscoelastic body, 0.1 g of a thermally expandable microcapsule (Matsumoto Microsphere F-48D, manufactured by Matsumoto Yushi Seiyaku Co., Ltd., average particle size 9 μm) is applied, and the adhesiveness of the viscoelastic body itself is used to form a viscoelastic film. A thin and uniform coating was applied to the surface of the elastic body, and the microcapsules were foamed in a constant temperature dryer (110° C., 1 hour). The expansion ratio was 3 times. The viscoelastic body had a thickness of 4 mm, a width and length of 50 mm, and a weight of 10.7 g. FIG. 1 shows the cut surface of the viscoelastic body observed with an optical microscope, and FIG. 2 shows the observation of the surface of the viscoelastic body. The average thickness of the foam layer was 120 μm, and the average thickness of the foam layer was 3% of the thickness of the entire viscoelastic body.
比較例１（表面処理無）
シリコーンゲルの原料となる２液（信越化学工業株式会社製ＫＥ－１０５２ Ａ液Ｂ液）の配合比率を調整し混ぜ合わせた後、恒温乾燥機にて（２３℃、２４時間）架橋させて粘弾性体を得た。粘弾性体の厚さは４ｍｍ、幅および長さはともに５０ｍｍで、重量は１０．７ｇであった。
Comparative Example 1 (no surface treatment)
After adjusting the blending ratio of the two liquids (KE-1052 A liquid B manufactured by Shin-Etsu Chemical Co., Ltd.) and mixing them, which are the raw materials of the silicone gel, they are crosslinked (23 ° C., 24 hours) in a constant temperature dryer to make the viscosity. An elastic body was obtained. The viscoelastic body had a thickness of 4 mm, a width and length of 50 mm, and a weight of 10.7 g.
比較例２（タルク）
シリコーンゲルの原料となる２液（信越化学工業株式会社製ＫＥ－１０５２ Ａ液Ｂ液）の配合比率を調整し混ぜ合わせた後、恒温乾燥機にて（２３℃、２４時間）架橋させて粘弾性体を作製した。この粘弾性体の表面に０．１ｇのタルクを付着させ軽く振り余分なタルクを落とした。粘弾性体の厚さは４ｍｍ、幅および長さはともに５０ｍｍで、重量は１０．６ｇであった。
Comparative Example 2 (talc)
After adjusting the blending ratio of the two liquids (KE-1052 A liquid B manufactured by Shin-Etsu Chemical Co., Ltd.) and mixing them, which are the raw materials of the silicone gel, they are crosslinked (23 ° C., 24 hours) in a constant temperature dryer to make the viscosity. An elastic body was produced. 0.1 g of talc was applied to the surface of this viscoelastic body, and the excess talc was removed by lightly shaking. The viscoelastic body had a thickness of 4 mm, a width and length of 50 mm, and a weight of 10.6 g.
比較例３（膜）
シリコーンゲルの原料となる２液（信越化学工業株式会社製ＫＥ－１０５２ Ａ液Ｂ液）の配合比率を調整し混ぜ合わせた後、恒温乾燥機にて（２３℃、２４時間）架橋させて粘弾性体を作製した。この粘弾性体の表面に縮合タイプシリコーン改質用コーティング材（信越化学工業株式会社製Ｘ－９３－１７５５－１）０．２ｇをこの粘弾性体の表面に均一に塗布し、恒温乾燥機にて（１２０℃、１時間）膜化させた。粘弾性体の厚さは４ｍｍ、幅および長さはともに５０ｍｍで、重量は１０．８ｇであった。粘弾性体の切断面を光学顕微鏡で観察したものを図３に示す。表層の平均膜厚は１００μｍであった。
Comparative Example 3 (membrane)
After adjusting the blending ratio of the two liquids (KE-1052 A liquid B manufactured by Shin-Etsu Chemical Co., Ltd.) and mixing them, which are the raw materials of the silicone gel, they are crosslinked (23 ° C., 24 hours) in a constant temperature dryer to make the viscosity. An elastic body was produced. On the surface of this viscoelastic body, 0.2 g of a coating material for condensation type silicone modification (X-93-1755-1 manufactured by Shin-Etsu Chemical Co., Ltd.) was evenly applied to the surface of this viscoelastic body and placed in a constant temperature dryer. (120° C., 1 hour) to form a film. The viscoelastic body had a thickness of 4 mm, a width and length of 50 mm, and a weight of 10.8 g. FIG. 3 shows a cut surface of the viscoelastic body observed with an optical microscope. The average film thickness of the surface layer was 100 μm.
比較例４（オイル）
シリコーンゲルの原料となる２液（信越化学工業株式会社製ＫＥ－１０５２ Ａ液Ｂ液）の配合比率を調整し混ぜ合わせた後、恒温乾燥機にて（２３℃、２４時間）架橋させて粘弾性体を作製した。この粘弾性体の表面にジメチルシリコーンオイル（信越化学工業株式会社製ＫＦ－９６－３００ＣＳ）を０．１ｇ塗布した。粘弾性体の厚さは４ｍｍ、幅および長さはともに５０ｍｍで、重量は１０．７ｇであった。
Comparative Example 4 (oil)
After adjusting the blending ratio of the two liquids (KE-1052 A liquid B manufactured by Shin-Etsu Chemical Co., Ltd.) and mixing them, which are the raw materials of the silicone gel, they are crosslinked (23 ° C., 24 hours) in a constant temperature dryer to make the viscosity. An elastic body was produced. 0.1 g of dimethyl silicone oil (KF-96-300CS manufactured by Shin-Etsu Chemical Co., Ltd.) was applied to the surface of this viscoelastic body. The viscoelastic body had a thickness of 4 mm, a width and length of 50 mm, and a weight of 10.7 g.
各実施例および比較例で作製した粘弾性体を用いて、以下の評価を行った。 The following evaluations were performed using the viscoelastic bodies produced in each example and comparative example.
＜ホコリ付着テスト＞
各実施例で作製した粘弾性体の重量を計量後（繊維屑付着前重量）、ホコリを模した繊維長１ｍｍ未満のポリエステル繊維で構成した繊維屑を片面に０．２０ｇ、両面で計０．４０ｇ付着させた後、往復２０回振りはらい、再度サンプルの重量（繊維屑付着後重量）を計量した。繊維屑付着後重量から繊維屑付着前重量を引いた値をもとに、以下の評価基準で評価した結果を表１に示す。
〇：付着量が０．０５ｇ未満
×：付着量が０．０５ｇ以上
<Dust adhesion test>
After measuring the weight of the viscoelastic body prepared in each example (weight before adhesion of fiber waste), 0.20 g of fiber waste composed of polyester fibers having a fiber length of less than 1 mm to simulate dust was added to one side, and a total of 0.20 g was applied to both sides. After attaching 40 g of the sample, the sample was shaken back and forth 20 times, and the weight of the sample (the weight after attaching the fiber waste) was measured again. Table 1 shows the results of evaluation according to the following evaluation criteria based on the value obtained by subtracting the weight before adhesion of fiber waste from the weight after adhesion of fiber waste.
○: adhesion amount is less than 0.05 g ×: adhesion amount is 0.05 g or more
＜表面接着性テスト＞
両面テープＡ（日東電工株式会社製Ｎｉｔｔｏ５００）、両面テープＢ（ＤＩＣ株式会社製８１０ＨＤ）、および、シリコーンの接着に特化した両面テープＣ（日東電工株式会社製Ｎｉｔｔｏ５３０２Ａ）のそれぞれの両面テープの片面にコピー紙を貼り付け、両面テープと紙とが剥がれないことを確認した。その後、各実施例および比較例で作製した粘弾性体の片面に両面テープの離型紙を剥がして貼りつけ、粘弾性体と両面テープの界面での剥離の有無を確認した。以下の評価基準で評価した結果を表１に示す。
〇：剥離無
×：剥離有
<Surface adhesion test>
One side of each of double-sided tape A (Nitto 500 manufactured by Nitto Denko Corporation), double-sided tape B (810HD manufactured by DIC Corporation), and double-sided tape C (Nitto 5302A manufactured by Nitto Denko Corporation) specializing in silicone adhesion. A piece of copy paper was pasted on the tape, and it was confirmed that the double-sided tape and the paper did not come off. After that, the release paper of the double-sided tape was peeled off and attached to one side of the viscoelastic body prepared in each example and comparative example, and the presence or absence of peeling at the interface between the viscoelastic body and the double-sided tape was confirmed. Table 1 shows the results of evaluation according to the following evaluation criteria.
〇: No peeling ×: With peeling
＜表面脱落テスト＞
各実施例および比較例で作製した粘弾性体の表面に幅１２ｍｍ、長さ４０ｍｍのセロハンテープを貼り、その上から１００ｇのローラーを用い１０往復させた。その後、錘を取り除き、続いてセロハンテープも取り除き、セロハンテープに粘弾性体の表面が脱落し付着していないかを確認した。以下の評価基準で評価した結果を表１に示す。
〇：脱落無
×：脱落有
<Surface shedding test>
A cellophane tape having a width of 12 mm and a length of 40 mm was attached to the surface of the viscoelastic body prepared in each of the examples and comparative examples, and a 100 g roller was reciprocated 10 times from above. After that, the weight was removed, and then the cellophane tape was also removed, and it was confirmed whether the surface of the viscoelastic body fell off and adhered to the cellophane tape. Table 1 shows the results of evaluation according to the following evaluation criteria.
〇: No dropping ×: Dropping
＜伸縮テスト＞
各実施例および比較例で作製した粘弾性体から幅２０ｍｍ、長さ５０ｍｍの試験片を切り出し、両端５ｍｍずつつかみ、もとの長さの３倍にまで引き伸ばし元の長さに戻した。この作業を２０回繰り返した後、表面状態を目視にて観察した。以下の評価基準で評価した結果を表１に示す。
〇：しわ無
×：しわ有
<Expansion test>
A test piece having a width of 20 mm and a length of 50 mm was cut out from the viscoelastic body prepared in each of the examples and comparative examples, and was held by 5 mm at each end and stretched to three times its original length and returned to its original length. After repeating this operation 20 times, the surface condition was visually observed. Table 1 shows the results of evaluation according to the following evaluation criteria.
〇: No wrinkles ×: Wrinkled
実施例１で作製した本発明の粘弾性体は、全ての評価項目に優れていた。 The viscoelastic body of the present invention produced in Example 1 was excellent in all evaluation items.
本発明の粘弾性体は、表面にホコリが付着しにくく、様々な両面テープや接着剤を塗布できる表面を有するため、制振材、防振材、防音材、遮熱材、電磁波シールド材、緩衝材、衝撃吸収材等に最適に使用できる。 The viscoelastic body of the present invention has a surface on which dust does not easily adhere and various double-sided tapes and adhesives can be applied. It can be used optimally as a cushioning material, a shock absorbing material, etc.
１：発泡層
２：粘弾性体
３：界面の最深部
４：界面までの厚み方向の長さ
1: foam layer 2: viscoelastic body 3: deepest part of interface 4: length in thickness direction to interface
Claims (7)
得られた粘弾性体を加熱して発泡させる工程
を含む粘弾性体の製造方法。 a step of adhering foamed beads to the surface of the viscoelastic body; and
A method for producing a viscoelastic body, comprising a step of heating and foaming the obtained viscoelastic body.
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| JP2016141010A (en) | 2015-01-30 | 2016-08-08 | 大日本印刷株式会社 | Laminate for suppressing fluid adhesion, and container for fluid |
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| JPH0262210A (en) * | 1988-08-30 | 1990-03-02 | Hayakawa Rubber Co Ltd | Manufacture of shock absorbing sheet |
| JPH106440A (en) * | 1996-06-19 | 1998-01-13 | Toray Dow Corning Silicone Co Ltd | Composite molded material composed of silicone gel formed product and releasable film and its manufacture |
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|---|---|---|---|---|
| JP2001163991A (en) | 1999-11-29 | 2001-06-19 | Technogel Gmbh & Co Kg | Polyurethane molded product and its manufacturing method |
| JP2008120903A (en) | 2006-11-10 | 2008-05-29 | Nitto Denko Corp | Heat-foamable re-releasable acrylic adhesive tape or sheet |
| JP2012071550A (en) | 2010-09-29 | 2012-04-12 | Achilles Corp | Urethane foam for sticking gelled elastic body, gelled elastic body-stuck urethane foam, and method for producing the gelled elastic body-stuck urethane foam |
| JP2016141010A (en) | 2015-01-30 | 2016-08-08 | 大日本印刷株式会社 | Laminate for suppressing fluid adhesion, and container for fluid |
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