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JP2009185206A - Composition for coating - Google Patents

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JP2009185206A
JP2009185206A JP2008027753A JP2008027753A JP2009185206A JP 2009185206 A JP2009185206 A JP 2009185206A JP 2008027753 A JP2008027753 A JP 2008027753A JP 2008027753 A JP2008027753 A JP 2008027753A JP 2009185206 A JP2009185206 A JP 2009185206A
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fine particles
porous silica
silica fine
coating composition
aqueous emulsion
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Kiyoshi Usui
潔 臼井
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Bridgestone Corp
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Bridgestone Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a composition for coating forming a coating film having a low static friction coefficient. <P>SOLUTION: The composition for coating is formed by adding porous silica fine particles to an aqueous emulsion. A synthetic porous silica fine particles formed by reacting sodium silicate with an acid and washing the resultant product with water and then drying the resultant product is favorable as the porous silica fine particles. As the aqueous emulsion, a urethane-based aqueous emulsion is favorable. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明はコーティング用組成物に係り、特に摩擦係数の小さい塗膜を形成することができるコーティング用組成物に関する。   The present invention relates to a coating composition, and more particularly to a coating composition capable of forming a coating film having a small friction coefficient.

水性エマルジョンに対し無機微粒子を配合することにより塗膜特性を改善することが種々行われている。   Various improvements of coating film properties have been made by blending inorganic fine particles with an aqueous emulsion.

例えば、特開平7−325390には、水性エマルジョンに対しコロイダルシリカを配合することにより、対象物に対する塗膜の密着性を高めると共に、塗膜の硬度を高めることが記載されている。
特開平7−325390
For example, Japanese Patent Application Laid-Open No. 7-325390 describes that by adding colloidal silica to an aqueous emulsion, the adhesion of the coating film to an object is increased and the hardness of the coating film is increased.
JP-A-7-325390

本発明は、静摩擦係数が低い塗膜を形成することができるコーティング用組成物を提供することを目的とする。   An object of this invention is to provide the coating composition which can form the coating film with a low static friction coefficient.

請求項1のコーティング用組成物は、水性エマルジョンに対し多孔質シリカ微粒子を添加してなるものである。   The coating composition according to claim 1 is obtained by adding porous silica fine particles to an aqueous emulsion.

請求項2のコーティング用組成物は、請求項1において、水性エマルジョンの固形分100重量部に対する多孔質シリカ微粒子の割合が5〜15重量部であることを特徴とするものである。   The coating composition of claim 2 is characterized in that, in claim 1, the ratio of the porous silica fine particles to the solid content of 100 parts by weight of the aqueous emulsion is 5 to 15 parts by weight.

請求項3のコーティング用組成物は、請求項1又は2において、多孔質シリカ微粒子の平均粒径が2〜10μmであることを特徴とするものである。   The coating composition according to claim 3 is the coating composition according to claim 1 or 2, wherein the porous silica fine particles have an average particle diameter of 2 to 10 μm.

請求項4のコーティング用組成物は、請求項1ないし3のいずれか1項において、多孔質シリカ微粒子は珪酸ソーダを酸と反応させ、水洗後、乾燥させた合成多孔質シリカ微粒子であることを特徴とするものである。   The coating composition according to claim 4 is the synthetic porous silica fine particles according to any one of claims 1 to 3, wherein the porous silica fine particles are synthetic porous silica fine particles obtained by reacting sodium silicate with an acid, washing with water and drying. It is a feature.

請求項5のコーティング用組成物は、請求項1ないし4のいずれか1項において、水性エマルジョンがウレタン系エマルジョンであることを特徴とするものである。   The coating composition according to claim 5 is characterized in that, in any one of claims 1 to 4, the aqueous emulsion is a urethane emulsion.

本発明のコーティング用組成物は、水性エマルジョンに対し多孔質シリカ微粒子を配合することにより、塗膜の摩擦係数を低下させるようにしたものである。なお、多孔質シリカ微粒子を配合することにより塗膜の摩擦係数が低下するメカニズムについては、本来、平坦面である樹脂表面層に、該微粒子が存在する事により、微妙な凹凸が形成されるためであると推察される。   In the coating composition of the present invention, the friction coefficient of the coating film is reduced by blending porous silica fine particles with the aqueous emulsion. The mechanism by which the friction coefficient of the coating film is reduced by blending the porous silica fine particles is because fine irregularities are formed by the presence of the fine particles in the resin surface layer that is originally a flat surface. It is guessed that.

なお、塗膜の摩擦係数を低下するために固体潤滑材の微粒子を水性エマルジョンに配合することが考えられるが、コーティング用組成物の長期保存安定性が低かったり、塗膜の摩擦係数が経時的に増大したりする短所がある。   In order to reduce the friction coefficient of the coating film, it is conceivable to add fine particles of solid lubricant to the aqueous emulsion, but the long-term storage stability of the coating composition is low, or the friction coefficient of the coating film changes over time. There is a disadvantage that increases.

以下、本発明についてさらに詳細に説明する。   Hereinafter, the present invention will be described in more detail.

本発明のコーティング用組成物は、水性エマルジョンに対し多孔質シリカ微粒子を添加してなるものである。   The coating composition of the present invention is obtained by adding porous silica fine particles to an aqueous emulsion.

エマルジョンとしては、合成樹脂エマルジョンが用いられ、合成樹脂エマルジョンとしては、たとえば、アクリル−スチレン共重合体エマルジョン、アクリル酸エステル共重合体エマルジョン、エチレン−酸酸ビニル共重合体エマルジョン、酢酸ビニル−飽和分岐脂肪酸ビニル共重合体エマルジョン、合成ゴム系ラテックスなどの乾燥型エマルジョンや、エポキシ樹脂エマルジョン、シリコーンアクリル樹脂エマルジョン、ウレタン樹脂エマルジョン、アクリル複合ウレタン樹脂エマルジョンなどの反応硬化型エマルジョンをはじめとする種々のエマルジョンが用いられ、使用目的に応じてこれらの中から耐侯性、被膜強度、コストなどを加味して適当なものを選択使用する。   As the emulsion, a synthetic resin emulsion is used. Examples of the synthetic resin emulsion include an acrylic-styrene copolymer emulsion, an acrylate copolymer emulsion, an ethylene-vinyl acid copolymer emulsion, and a vinyl acetate-saturated branch. Various emulsions including dry emulsions such as fatty acid vinyl copolymer emulsions and synthetic rubber latexes, and reactive curable emulsions such as epoxy resin emulsions, silicone acrylic resin emulsions, urethane resin emulsions, and acrylic composite urethane resin emulsions Depending on the purpose of use, an appropriate one is selected and used in consideration of weather resistance, film strength, cost and the like.

本発明では、特にウレタン樹脂エマルジョンとりわけアニオン系自己乳化型ウレタン系エマルジョンが好適である。   In the present invention, a urethane resin emulsion, particularly an anionic self-emulsifying urethane emulsion, is particularly suitable.

合成樹脂エマルジョンの固形分濃度に特に限定はないが、通常は10〜75重量%の範囲から選ぶことが多い。ただし、特に薄膜化を図るときは、さらに水で稀釈して用いることもできる。   The solid content concentration of the synthetic resin emulsion is not particularly limited, but is usually selected from the range of 10 to 75% by weight. However, it can be further diluted with water to reduce the film thickness.

水性エマルジョンに配合する多孔質シリカ微粒子としては、珪酸ソーダを酸たとえば硫酸などの無機酸と反応させてシリカゾルを得、該シリカゾルを水洗した後、乾燥し、シリカ粒子が所定の粒度となるように粒度調整することによって得られるものが好適である。   As the porous silica fine particles to be blended in the aqueous emulsion, silica sol is obtained by reacting sodium silicate with an acid, for example, an inorganic acid such as sulfuric acid, and the silica sol is washed with water and dried so that the silica particles have a predetermined particle size. What is obtained by adjusting the particle size is preferred.

多孔質シリカ微粒子の平均粒径は、2〜10μm程度が好ましい。この平均粒径は、レーザー散乱法により計測される値である。   The average particle diameter of the porous silica fine particles is preferably about 2 to 10 μm. This average particle diameter is a value measured by a laser scattering method.

このような多孔質シリカ微粒子としては、富士シリシア化学株式会社製の「サイリシア」を好適に用いることができる。   As such porous silica fine particles, “Silysia” manufactured by Fuji Silysia Chemical Co., Ltd. can be suitably used.

合成樹脂エマルジョン中の樹脂分100重量部に対する多孔質シリカ微粒子の量は、5〜15重量部、好ましくは5〜10重量部である。多孔質シリカ微粒子の割合が余りに少ないときは摩擦係数低下の効果が得られず、余りに多いときは密着性、透明性などの点でかえって不利となる。   The amount of the porous silica fine particles relative to 100 parts by weight of the resin content in the synthetic resin emulsion is 5 to 15 parts by weight, preferably 5 to 10 parts by weight. When the ratio of the porous silica fine particles is too small, the effect of reducing the friction coefficient cannot be obtained, and when it is too large, it is disadvantageous in terms of adhesion and transparency.

コーティング用組成物を調製するには、水性エマルジョンに対し多孔質シリカ微粒子を添加し、混合すればよい。   In order to prepare the coating composition, the porous silica fine particles may be added to the aqueous emulsion and mixed.

上記各成分を有するコーティング用組成物には、必要に応じ、増粘剤、低温安定剤、造膜助剤、垂れ防止剤、界面活性剤、消泡剤、着色剤、溶剤などの添加剤を含有させることができる。   Additives such as thickeners, low-temperature stabilizers, film-forming aids, sag-preventing agents, surfactants, antifoaming agents, colorants, solvents, etc., to the coating composition having the above components as necessary. It can be included.

本発明のコーティング用組成物を塗布する対象物としては、ウレタンエラストマー等のエラストマー、ABS等の一般的な樹脂、ガラス表面などが例示される。   Examples of the object to which the coating composition of the present invention is applied include elastomers such as urethane elastomers, general resins such as ABS, and glass surfaces.

塗膜の厚み(乾燥後)は10〜30μm程度が好適である。   About 10-30 micrometers is suitable for the thickness (after drying) of a coating film.

次に実施例及び比較例をあげて本発明をさらに詳細に説明する。以下「部」とあるのは重量部である。   Next, the present invention will be described in more detail with reference to examples and comparative examples. Hereinafter, “parts” means parts by weight.

なお、以下の実施例及び比較例で用いた材料は次の通りである。
<水性エマルジョン>
三洋化成 ユーコート UWS−145
アニオン系自己乳化型ウレタン系エマルジョン(樹脂分37%)
<多孔質シリカ微粒子>
富士シリシア化学 サイリシア 310P、350、370
(無定形二酸化ケイ素 SiO・nHO)
平均粒径は次の通り。
The materials used in the following examples and comparative examples are as follows.
<Aqueous emulsion>
Sanyo Kasei U-coat UWS-145
Anionic self-emulsifying urethane emulsion (resin content 37%)
<Porous silica fine particles>
Fuji Silysia Chemical Silicia 310P, 350, 370
(Amorphous silicon dioxide SiO 2 · nH 2 O)
The average particle size is as follows.

サイリシア 310P 2.7μm
サイリシア 350 3.9μm
サイリシア 370 6.4μm
<比較例で用いた微粒子>
PEパウダー(SK−PE−20L 20μ/(株)セイシン企業)
PTFEパウダー(TFW−3000F 3μ/(株)セイシン企業)
<調製方法>
水性エマルジョン、微粒子及びエマルジョン濃度調整のための水を、特殊機化工業(株) T.K.ロボミックスfモデルにて500〜1000rpmにて、5分から10分間、攪拌混合を行った。
<コーティング方法>
NO3.及びNO10.バーコーターを使用し常法にて塗膜を形成した。
<乾燥方法>
ADVANTEC THM042FA型恒温槽にて80℃×1時間乾燥した。
<被着体>
ウレタン系微発泡シート 密度250g/cm 硬度20/アスカーC硬度
厚み2mm
<静摩擦係数測定>
測定器 新東科学株式会社 HEIDON TYPE:10
静摩擦測定装置
対象物 ABS樹脂
荷重 200g
サンプルサイズ 20mm×20mm
Silicia 310P 2.7μm
Silicia 350 3.9μm
Silicia 370 6.4μm
<Fine particles used in comparative examples>
PE powder (SK-PE-20L 20μ / Seishin Corporation)
PTFE powder (TFW-3000F 3μ / Seishin company)
<Preparation method>
A water-based emulsion, fine particles, and water for adjusting the emulsion concentration are supplied from Tokushu Kika Kogyo Co., Ltd. K. The mixture was stirred and mixed for 5 to 10 minutes at 500 to 1000 rpm in the ROBOMIX f model.
<Coating method>
NO3. And NO10. A coating film was formed by a conventional method using a bar coater.
<Drying method>
It dried at 80 degreeC x 1 hour in ADVANTEC THM042FA type | mold thermostat.
<Adherent>
Urethane fine foam sheet Density 250g / cm 3 hardness 20 / Asker C hardness
Thickness 2mm
<Measurement of static friction coefficient>
Measuring instrument Shinto Science Co., Ltd. HEIDON TYPE: 10
Static friction measuring device Object ABS resin Load 200g
Sample size 20mm x 20mm

測定を5回行い、測定値の下限値と上限値を表1に示した。なお、このABS樹脂と上記ウレタン系微発泡シートとの静摩擦係数は1以上である。   The measurement was performed 5 times, and the lower limit value and the upper limit value of the measured values are shown in Table 1. In addition, the static friction coefficient of this ABS resin and the said urethane type fine foam sheet is 1 or more.

[実施例1〜12]
水性エマルジョン、多孔質シリカ微粒子及び水を表1の割合で配合し、上記の通り調製し、塗膜を形成し、その静摩擦係数を測定した。結果を表1に示す。
[Examples 1 to 12]
An aqueous emulsion, porous silica fine particles and water were blended in the proportions shown in Table 1, prepared as described above, a coating film was formed, and the coefficient of static friction was measured. The results are shown in Table 1.

実施例1〜6ではバーコーターNo.3を使用し、実施例7〜12ではバーコーターNo.6を使用した。   In Examples 1 to 6, the bar coater No. 3 and in Examples 7 to 12, the bar coater No. 6 was used.

なお、各コーティング用組成物を静置し、経時変化を観察したところ、約2週間で水性エマルジョンと多孔質シリカ微粒子とが層状に分離したが、攪拌することにより再び均一な分散液に戻ることが認められた。このことから、各実施例のコーティング用組成物は長期保存安定性に優れることが認められた。   In addition, when each coating composition was allowed to stand and the change with time was observed, the aqueous emulsion and the porous silica fine particles were separated into layers in about 2 weeks, but the mixture returned to a uniform dispersion again by stirring. Was recognized. From this, it was recognized that the coating composition of each Example was excellent in long-term storage stability.

[比較例1]
多孔質シリカ微粒子の代わりに上記PE(ポリエチレン)パウダーを用いたこと以外は実施例2,4,6と同様にしてコーティング用組成物を調製し、塗膜を形成した。結果を表1に示す。
[Comparative Example 1]
A coating composition was prepared in the same manner as in Examples 2, 4 and 6 except that the above PE (polyethylene) powder was used instead of the porous silica fine particles, and a coating film was formed. The results are shown in Table 1.

なお、このコーティング用組成物を静置して外観の経時変化を観察したところ、2週間で液上部にパウダーが「だま」状に分離し、しかも攪拌しても均一にはならなかった。このことから、比較例1のコーティング用組成物は、保存安定性が悪いことが認められた。   When this coating composition was allowed to stand and the change in appearance over time was observed, the powder separated into a “dama” shape at the top of the liquid in two weeks, and even when stirred, it did not become uniform. From this, it was recognized that the coating composition of Comparative Example 1 has poor storage stability.

[比較例2]
多孔質シリカ微粒子の代わりに上記PTFE(ポリテトラフルオロエチレン)パウダーを用いたこと以外は実施例2,4,6と同様にしてコーティング用組成物を調製し、塗膜を形成した。結果を表1に示す。
[Comparative Example 2]
A coating composition was prepared in the same manner as in Examples 2, 4 and 6 except that the PTFE (polytetrafluoroethylene) powder was used instead of the porous silica fine particles, and a coating film was formed. The results are shown in Table 1.

なお、このコーティング用組成物を静置して外観の経時変化を観察したところ、2週間で液上部にパウダーが「だま」状に分離し、しかも攪拌しても均一にはならなかった。このことから、比較例2のコーティング用組成物は、保存安定性が悪いことが認められた。   When this coating composition was allowed to stand and the change in appearance over time was observed, the powder separated into a “dama” shape at the top of the liquid in two weeks, and even when stirred, it did not become uniform. From this, it was recognized that the coating composition of Comparative Example 2 had poor storage stability.

Figure 2009185206
Figure 2009185206

上記各実施例及び比較例より、実施例に係るコーティング用組成物は長期保存安定性に優れると共に、これを用いて形成された塗膜の静摩擦係数が低いことが明らかである。   From the above examples and comparative examples, it is clear that the coating compositions according to the examples are excellent in long-term storage stability and that the coefficient of static friction of a coating film formed using the same is low.

比較例1,2とも保存安定性に乏しく、また比較例1では静摩擦係数も高い。   Both Comparative Examples 1 and 2 have poor storage stability, and Comparative Example 1 has a high coefficient of static friction.

Claims (5)

水性エマルジョンに対し多孔質シリカ微粒子を添加してなるコーティング用組成物。   A coating composition comprising porous silica fine particles added to an aqueous emulsion. 請求項1において、水性エマルジョンの固形分100重量部に対する多孔質シリカ微粒子の割合が5〜15重量部であることを特徴とするコーティング用組成物。   2. The coating composition according to claim 1, wherein the ratio of the porous silica fine particles to the solid content of 100 parts by weight of the aqueous emulsion is 5 to 15 parts by weight. 請求項1又は2において、多孔質シリカ微粒子の平均粒径が2〜10μmであることを特徴とするコーティング用組成物。   The coating composition according to claim 1 or 2, wherein the porous silica fine particles have an average particle diameter of 2 to 10 µm. 請求項1ないし3のいずれか1項において、多孔質シリカ微粒子は珪酸ソーダを酸と反応させ、水洗後、乾燥させた合成多孔質シリカ微粒子であることを特徴とするコーティング用組成物。   4. The coating composition according to claim 1, wherein the porous silica fine particles are synthetic porous silica fine particles obtained by reacting sodium silicate with an acid, washing with water and drying. 請求項1ないし4のいずれか1項において、水性エマルジョンがウレタン系エマルジョンであることを特徴とするコーティング用組成物。   The coating composition according to any one of claims 1 to 4, wherein the aqueous emulsion is a urethane emulsion.
JP2008027753A 2008-02-07 2008-02-07 Composition for coating Pending JP2009185206A (en)

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Cited By (3)

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JP2016191013A (en) * 2015-03-31 2016-11-10 日本表面化学株式会社 Water-soluble coating composition
JP2019167497A (en) * 2018-03-26 2019-10-03 大建工業株式会社 Aqueous coating composition
EP3677548A4 (en) * 2016-07-25 2020-07-08 Chengyuan Wang Method for manufacturing ultra-porous nano-sio2

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016191013A (en) * 2015-03-31 2016-11-10 日本表面化学株式会社 Water-soluble coating composition
EP3677548A4 (en) * 2016-07-25 2020-07-08 Chengyuan Wang Method for manufacturing ultra-porous nano-sio2
JP2019167497A (en) * 2018-03-26 2019-10-03 大建工業株式会社 Aqueous coating composition
JP7037403B2 (en) 2018-03-26 2022-03-16 大建工業株式会社 Aqueous paint composition

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