JPH11323215A - Coating composition with excellent fractional characteristic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition capable of inexpensively and industrially forming a coating film enabling its high coefficient of abrasion to be stably retained over a long service period on an industrial product such as a paper feed roller made of rubber, by including a resin and a specific inorganic filler. SOLUTION: This coating composition is obtained by including (A) a resin, (B) an inorganic filler consisting of inorganic powder with its constituent particle having a size of 20-50 μm, pref. 25-40 μm at 50% cumulative height point and indeterminate polyhedrons with acute angles (pref. aluminum oxide powder, silicon carbide powder, silicon oxide vitreous powder or the like), and (C) as necessary, a sedimentation-proofing agent (e.g. polyethyleneamide); wherein the component A is e.g. an acrylic melamine resin, amino alkyd resin, one-pack polyurethane resin, two-pack polyurethane resin composed of the chief agent and a curing agent. It is preferable that the amounts of the components B and C to be compounded are 35-55 wt.% and 1-3 wt.% based on the total solid content of this composition.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、摩擦特性などに優
れた塗膜を形成する塗料組成物に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating composition for forming a coating film having excellent friction characteristics.

【０００２】[0002]

【従来の技術】従来、摩擦を利用した工業製品にはゴム
材料が広く用いられている。このような分野の具体的な
例として、カラープリンターにおいては通常、ゴム製の
給紙ローラーが使用されている。2. Description of the Related Art Conventionally, rubber materials have been widely used for industrial products utilizing friction. As a specific example of such a field, a paper feed roller made of rubber is usually used in a color printer.

【０００３】[0003]

【発明が解決しようとする課題】しかしながら、最近の
カラープリンターは一層鮮明な画質が要求されており、
その給紙ローラーの紙搬送部では高い寸法精度と安定し
た摩擦係数（０．８〜１．２）が求められているため、
従来のゴム製の給紙ローラーでは充分に対応できなくな
っている。すなわち、特殊な高度の摩擦性能が要求され
る分野においては、従来公知のゴム材料では量産困難で
あり工業的に充分には対応できない。However, recent color printers are required to have clearer image quality.
Since high dimensional accuracy and a stable friction coefficient (0.8 to 1.2) are required in the paper transport section of the paper feed roller,
Conventional rubber paper feed rollers are no longer sufficient. That is, in a field where a special high friction performance is required, conventionally known rubber materials are difficult to mass-produce and cannot be industrially sufficiently satisfied.

【０００４】本発明は、高い摩耗係数を長い使用期間に
わたって安定的に保持しうる塗膜をゴム製給紙ローラー
等の特殊な高度の摩擦性能が要求される工業製品に安価
かつ工業的に形成できる塗料組成物を提供することを目
的とする。The present invention provides an inexpensive and industrial method for forming a coating film capable of stably maintaining a high wear coefficient over a long use period on an industrial product requiring a special high frictional performance such as a rubber feed roller. It is an object of the present invention to provide a coating composition which can be used.

【０００５】[0005]

【課題を解決するための手段】前記目的を達成するため
に、本発明は、樹脂と無機充填剤とを少なくとも含有す
る摩擦特性に優れた塗料組成物であって、前記無機充填
剤が累積高さ５０％点において２０〜５０μの範囲の粒
子径かつ鋭角を持つ不定形多面体の無機粉末であるこ
と、を特徴とする前記塗料組成物である。In order to achieve the above-mentioned object, the present invention provides a coating composition having at least a resin and an inorganic filler and having excellent frictional properties, wherein the inorganic filler has a cumulative high content. The coating composition according to claim 1, wherein the coating composition is an amorphous polyhedral inorganic powder having a particle diameter in the range of 20 to 50 [mu] at a 50% point and an acute angle.

【０００６】また本発明は、樹脂と無機充填剤と沈降防
止剤とを少なくとも含有する摩擦特性に優れた塗料組成
物であって、前記無機充填剤が累積高さ５０％点におい
て２０〜５０μの範囲の粒子径かつ鋭角を持つ不定形多
面体の無機粉末であること、を特徴とする前記塗料組成
物である。The present invention also provides a coating composition having at least a resin, an inorganic filler and an anti-settling agent and having excellent friction characteristics, wherein the inorganic filler has a cumulative height of 20 to 50 μm at a 50% point. The coating composition according to claim 1, which is an amorphous polyhedral inorganic powder having a particle diameter in a range and an acute angle.

【０００７】[0007]

【発明の実施の形態】本発明における樹脂は、塗料にお
いて一般に使用される樹脂成分であり、塗膜を形成する
能力のある樹脂あるいは樹脂化可能な単量体などの化合
物を含む。具体的には例えば、アクリルメラミン樹脂、
アミノアルキド樹脂、一液型ポリウレタン樹脂、主剤と
硬化剤とからなる二液型ポリウレタン樹脂、ポリエステ
ル樹脂を挙げることができる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The resin in the present invention is a resin component generally used in paints, and includes a resin capable of forming a coating film or a compound such as a monomer capable of being converted into a resin. Specifically, for example, acrylic melamine resin,
An aminoalkyd resin, a one-pack type polyurethane resin, a two-pack type polyurethane resin comprising a main agent and a curing agent, and a polyester resin can be exemplified.

【０００８】本発明における無機充填剤は、累積高さ５
０％点において２０〜５０μの範囲の粒子径、好ましく
２５〜４０μの範囲の粒子径、かつ、鋭角を持つ不定形
多面体の無機粉末である。具体的には、これらの粒子は
更に、累積高さ３％点の粒子径８７μ、累積高さ９４％
点の粒子径３３μから累積高さ３％点の粒子径４３μ、
累積高さ９４％点の粒子径１３μまでの範囲の粒子径、
好ましくは累積高さ３％点の粒子径８７μ、累積高さ９
４％点の粒子径３３μから累積高さ３％点の粒子径６６
μ、累積高さ９４％点の粒子径２３μまでの範囲の粒子
径を持っているものが好ましい。無機充填剤の粒子径が
小さすぎる場合には、紙などの被搬送物との摩擦係数が
小さく不十分であり、粒子径が大きすぎる場合には、被
搬送物に傷を発生させやすくなり好ましくない。具体例
としては、これらの条件を備えた酸化アルミニウム粉
末、炭化ケイ素粉末、酸化ケイ素ガラス質粉末、又はこ
れらの任意の２種或いは３種の混合物が好ましく、これ
らのなかで酸化アルミニウム粉末が特に好ましい。この
無機充填剤の配合量は、塗料組成物の全固形分中で３５
〜５５重量％の範囲が好ましく、特に４０〜５０重量％
の範囲が好ましい。無機充填剤の配合量が３５重量％よ
り少ない場合には、形成される塗膜表面の粒子の分布密
度が疎であるため、また、５５重量％より多い場合に
は、粒子の分布密度が過密すぎるため、塗膜の摩擦係数
が小さくなり好ましくない。In the present invention, the inorganic filler has a cumulative height of 5
It is an amorphous polyhedral inorganic powder having a particle diameter in the range of 20 to 50 μ at the 0% point, preferably in the range of 25 to 40 μ, and an acute angle. Specifically, these particles further have a particle diameter of 87 μ at a cumulative height of 3% point and a cumulative height of 94%.
A particle diameter of 43 μ at a cumulative height of 3% from a particle diameter of 33 μ at the point,
A particle size in the range of up to 13 μm at a 94% cumulative height,
Preferably, the particle diameter is 87 μ at a cumulative height of 3%, and the cumulative height is 9
From the particle diameter of 33% at the 4% point to the particle diameter of 66 at the cumulative height of 3% point
It is preferred that the particles have a particle diameter in the range of 23 μm at μ and a cumulative height of 94%. If the particle size of the inorganic filler is too small, the coefficient of friction with the conveyed object such as paper is insufficient and insufficient, and if the particle size is too large, the conveyed object is liable to cause scratches, which is preferable. Absent. As specific examples, aluminum oxide powder, silicon carbide powder, silicon oxide vitreous powder, or any mixture of two or three of these powders having these conditions is preferable, and among these, aluminum oxide powder is particularly preferable. . The amount of the inorganic filler is 35% in the total solid content of the coating composition.
The range is preferably from 55 to 55% by weight, particularly from 40 to 50% by weight.
Is preferable. When the amount of the inorganic filler is less than 35% by weight, the distribution density of the particles on the surface of the formed coating film is low. It is not preferable because the coefficient of friction of the coating film is too small.

【０００９】本発明においては、塗料貯蔵時の無機充填
剤の沈降や塗装時のその分離を防止すると同時に、無機
充填剤の鋭い角により紙が傷付くのを防止するため、沈
降防止剤を併用するのが好ましい。このような沈降防止
剤としては、ポリエチレンアマイド、有機ベントナイ
ト、平均粒径０．１μ以下のシリカ微粉末を例示するこ
とができるが、塗料の適正な粘度や形成塗膜の耐久摩耗
性を確保すると共に紙の損傷を防止するには、塗料にチ
クソ性を付与しうるポリエチレンアマイドが好ましい。
沈降防止剤は、塗料組成物の全固形分中で１〜３重量％
の範囲で使用するが好ましい。沈降防止剤の配合量が少
なすぎる場合には、無機充填剤の沈降防止効果や紙の損
傷防止効果が不充分であり、配合量が多すぎる場合に
は、塗料の適正な流動性や分散性を確保しにくい。In the present invention, an anti-settling agent is used in combination to prevent sedimentation of the inorganic filler during storage of the paint and its separation during coating and to prevent the paper from being damaged by sharp corners of the inorganic filler. Is preferred. Examples of such an anti-settling agent include polyethylene amide, organic bentonite, and fine silica powder having an average particle size of 0.1 μ or less, which ensure proper viscosity of the coating and durability of the formed coating film. In addition, in order to prevent the paper from being damaged, polyethylene amide which can impart thixotropy to the paint is preferable.
The anti-settling agent is 1 to 3% by weight in the total solid content of the coating composition.
Is preferably used. If the amount of the antisettling agent is too small, the effect of preventing the inorganic filler from settling or the paper from being damaged is insufficient, and if the amount is too large, the proper fluidity and dispersibility of the paint are required. Is difficult to secure.

【００１０】[0010]

【実施例】以下、本発明を実施例により更に詳細に説明
する。なお、実施例及び比較例において、「％」は「重
量％」、「部」は「重量部」を意味する。実施例１ アクリルメラミン樹脂塗料（カシュー（株）製アクリエ
ース＃３００グレー、固形分５０％）１００部に、まえ
もってトルエン３２部とポリエチレンアマイド（楠本化
成（株）製Ａ６３０−２０Ｘ、固形分２０％）８部を分
散した混合物を添加し、均一になるまで攪拌した。次
に、この混合物に、酸化アルミニウム粉末（昭和電工
（株）製ホワイトモランダムＷＡ＃３２０：累積高さ５
０％点の粒子径４０．０±２．５μ、累積高さ３％点の
粒子径７４μ、累積高さ９４％点の粒子径２７μ、最大
粒子径９８μ）４５部を添加して、塗料組成物を得た。
得られた塗料組成物１８５部と希釈剤（キシレン／ハイ
ゾール＃１００／イソブタノール＝４／４／２）３７部
を均一になるまで攪拌して希釈した塗料を、ニッケルめ
っき板にスプレーガンで乾燥塗膜の厚さが３０μになる
よう塗装した。塗装板は室温で１０分間静置し、１６０
℃で２０分間加熱乾燥し、更に室温で２４時間静置した
後、以下の性能試験を行った。これらの結果をまとめて
表１に示す。The present invention will be described in more detail with reference to the following examples. In Examples and Comparative Examples, “%” means “% by weight” and “parts” means “parts by weight”. Example 1 To 100 parts of an acrylic melamine resin paint (Acryace # 300 gray, 50% solid content, manufactured by Cashew Co., Ltd.), 32 parts of toluene and polyethylene amide (A630-20X, 20% solid content, manufactured by Kusumoto Kasei Co., Ltd.) The mixture in which 8 parts were dispersed was added and stirred until uniform. Next, aluminum oxide powder (White Morundum WA # 320 manufactured by Showa Denko KK: cumulative height 5) was added to this mixture.
45% of a particle diameter of 40.0 ± 2.5μ at 0% point, a particle diameter of 74μ at a cumulative height of 3% point, a particle diameter of 27μ at a cumulative height of 94% point, and a maximum particle diameter of 98μ) are added to the coating composition. I got something.
The paint obtained by stirring and diluting 185 parts of the obtained coating composition and 37 parts of a diluent (xylene / Hisol # 100 / isobutanol = 4/4/2) until uniform is dried on a nickel-plated plate with a spray gun. Coating was performed so that the thickness of the coating film was 30 μm. The coated plate is allowed to stand at room temperature for 10 minutes,
After drying by heating at 20 ° C. for 20 minutes and further standing at room temperature for 24 hours, the following performance tests were performed. The results are summarized in Table 1.

【００１１】〔性能試験〕 （１）摩擦係数の測定 ヘイドン１４４型表面測定機に塗装板をセットし、５×
５ｃｍのコピー用紙を装着した端子で塗装面を一定速度
で移動させた。そのときの摩擦係数を測定した。 （２）紙の損傷性 摩擦係数を測定した５×５ｃｍのコピー用紙の表面の傷
付き度合を目視により判定した。 （３）塗料組成物及び希釈塗料の貯蔵性 塗料組成物１ｋｇを１リットルの容器に充填し、５０℃
で１か月間貯蔵した後、開封し、容器底部の塗料組成物
中の酸化アルミニウム粉末の沈殿状態を観察した。塗料
組成物１００部に対して希釈剤２０部の割合で希釈した
塗料１ｋｇを１リットルの容器に充填し、５０℃で１日
間貯蔵した後、開封し、容器底部の希釈塗料中の酸化ア
ルミニウム粉末の沈殿状態を観察した。 （４）塗装適性 塗料組成物１００部に対して希釈剤２０部の割合で希釈
した塗料をスプレーガンで塗装し、その吐出性や微粒化
状態及び塗膜状態を観察した。 （５）塗膜の耐久摩耗性 塗装板の塗膜面を綿帆布で５０回スライドさせ、塗膜の
摩滅状態を観察した。[Performance Test] (1) Measurement of Coefficient of Friction A painted plate was set on a Haydon 144 type surface measuring machine, and 5 ×
The painted surface was moved at a constant speed by a terminal equipped with 5 cm copy paper. The coefficient of friction at that time was measured. (2) Damage of Paper The degree of scratching on the surface of a 5 × 5 cm copy sheet whose friction coefficient was measured was visually determined. (3) Storage property of paint composition and diluted paint 1 kg of paint composition is filled in a 1 liter container, and 50 ° C
And stored for one month, and opened, and the precipitation state of the aluminum oxide powder in the coating composition at the bottom of the container was observed. 1 kg of paint diluted with 20 parts of diluent with respect to 100 parts of paint composition is filled in a 1 liter container, stored at 50 ° C. for 1 day, opened, and aluminum oxide powder in the diluted paint at the bottom of the container is opened. Was observed. (4) Coating aptitude A coating diluted with 20 parts of a diluent with respect to 100 parts of the coating composition was applied with a spray gun, and its dischargeability, atomization state, and coating state were observed. (5) Durability of coating film The coating surface of the coated plate was slid 50 times with a cotton canvas, and the abrasion state of the coating film was observed.

【００１２】実施例２ アクリルポリオール樹脂塗料（カシュー（株）製ストロ
ン＃１００グレー、固形分５０％）１００部に、まえも
ってトルエン３２部とポリエチレンアマイド（楠本化成
（株）製Ａ６３０−２０Ｘ、固形分２０％）８部を分散
した混合物を添加し、均一になるまで攪拌した。次に、
この混合物に、酸化アルミニウム粉末（昭和電工（株）
製ホワイトモランダムＷＡ＃３２０：累積高さ５０％点
の粒子径４０．０±２．５μ、累積高さ３％点の粒子径
７４μ、累積高さ９４％点の粒子径２７μ、最大粒子径
９８μ）４５部を添加して、塗料組成物を得た。得られ
た塗料組成物１８５部とイソシアネート硬化剤（固形分
５０％）２３部と希釈剤（トルエン／キシレン／酢酸ブ
チル／ＰＭＡ＝１／１／１／１）４６部を均一になるま
で攪拌して希釈した塗料を、ＡＢＳ板にスプレーガンで
乾燥塗膜の厚さが２０μになるよう塗装した。塗装板は
室温で１０分間静置し、８０℃で２０分間加熱乾燥し、
更に室温で２４時間静置した後、実施例１と同様にして
性能試験を行った。これらの結果をまとめて表１に示
す。 Example 2 In 100 parts of an acrylic polyol resin paint (Strong # 100 gray, solid content 50%, manufactured by Cashew Co., Ltd.), 32 parts of toluene and polyethylene amide (A630-20X manufactured by Kusumoto Chemicals, solids content) (20%) A mixture in which 8 parts were dispersed was added and stirred until uniform. next,
This mixture was mixed with aluminum oxide powder (Showa Denko KK)
White Morundum WA # 320: 40.0 ± 2.5 μm particle diameter at 50% cumulative height, 74 μm particle diameter at 3% cumulative height, 27 μm particle diameter at 94% cumulative height, maximum particle diameter 98μ) was added to obtain a coating composition. 185 parts of the obtained coating composition, 23 parts of isocyanate curing agent (solid content 50%) and 46 parts of diluent (toluene / xylene / butyl acetate / PMA = 1/1/1/1) were stirred until uniform. The diluted paint was applied to an ABS plate with a spray gun so that the thickness of the dried coating film became 20 μm. The coated plate is allowed to stand at room temperature for 10 minutes, and is dried by heating at 80 ° C. for 20 minutes.
After leaving still at room temperature for 24 hours, a performance test was performed in the same manner as in Example 1. The results are summarized in Table 1.

【００１３】比較例１及び２ 実施例１と同様にして、表１に示す各成分を使用し、希
釈塗料を調製し、性能試験を行った。これらの結果をま
とめて表１に示す。なお、表１において、ホワイトモラ
ンダムＷＡ＃２４０は、累積高さ５０％点の粒子径５
７．０±３．０μ、累積高さ３％点の粒子径１０３μ以
下、累積高さ９４％点の粒子径４０μ以上、最大粒子径
１２７μ以下であり、ホワイトモランダムＷＡ＃４００
０は、累積高さ５０％点の粒子径３．０±０．４μ、累
積高さ３％点の粒子径８．０μ、累積高さ９４％点の粒
子径１．３μ、最大粒子径１１μである。 Comparative Examples 1 and 2 In the same manner as in Example 1, each component shown in Table 1 was used to prepare a diluted paint, and a performance test was conducted. The results are summarized in Table 1. In Table 1, White Morundum WA # 240 has a particle diameter of 5% at a cumulative height of 50%.
7.0 ± 3.0μ, particle diameter 103μ or less at 3% cumulative height, particle diameter 40μ or more at cumulative height 94% point, maximum particle diameter 127μ or less, White Morundum WA # 400
0 indicates a particle diameter of 3.0 ± 0.4 μ at a cumulative height of 50%, a particle diameter of 8.0 μ at a cumulative height of 3%, a particle diameter of 1.3 μ at a cumulative height of 94%, and a maximum particle diameter of 11 μ. It is.

【００１４】[0014]

【表１】 [Table 1]

【００１５】[0015]

【発明の効果】以上説明した通り、本発明の塗料組成物
を使用して形成される塗膜は、高い摩耗係数を長い使用
期間にわたって安定的に保持しうると共に、接触する相
手素材表面を傷つけない。そのため、本発明の塗料組成
物により、ゴム製給紙ローラー等の特殊な高度の摩擦性
能などが要求される工業製品を安価かつ工業的に量産で
きる。As described above, the coating film formed by using the coating composition of the present invention can stably maintain a high coefficient of abrasion over a long period of use and damage the surface of a contacting material. Absent. Therefore, the coating composition of the present invention enables low-cost and industrial mass production of industrial products that require special high friction performance, such as rubber feed rollers.

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 樹脂と無機充填剤とを少なくとも含有す
る摩擦特性に優れた塗料組成物であって、 前記無機充填剤が、累積高さ５０％点において２０〜５
０μの範囲の粒子径かつ鋭角を持つ不定形多面体の無機
粉末であること、を特徴とする前記塗料組成物。1. A coating composition having at least a resin and an inorganic filler and having excellent friction characteristics, wherein the inorganic filler has a cumulative height of 20 to 5 at a 50% point.
The coating composition, wherein the coating composition is an amorphous polyhedral inorganic powder having a particle diameter in the range of 0 μ and an acute angle. 【請求項２】 樹脂と無機充填剤と沈降防止剤とを少な
くとも含有する摩擦特性に優れた塗料組成物であって、 前記無機充填剤が、累積高さ５０％点において２０〜５
０μの範囲の粒子径かつ鋭角を持つ不定形多面体の無機
粉末であること、を特徴とする前記塗料組成物。2. A coating composition having at least a resin, an inorganic filler and an antisettling agent and having excellent friction characteristics, wherein the inorganic filler has a cumulative height of 20 to 5 at a 50% cumulative height point.
The coating composition, wherein the coating composition is an amorphous polyhedral inorganic powder having a particle diameter in the range of 0 μ and an acute angle. 【請求項３】 前記無機充填剤が、それぞれ累積高さ５
０％点において２０〜５０μの範囲の粒子径かつ鋭角を
持つ不定形多面体の、酸化アルミニウム粉末、炭化ケイ
素粉末、及び／又は酸化ケイ素ガラス質粉末である、請
求項１又は２に記載の前記塗料組成物。3. The method according to claim 1, wherein each of the inorganic fillers has a cumulative height of 5.
The paint according to claim 1 or 2, which is an amorphous polyhedral aluminum oxide powder, a silicon carbide powder, and / or a silicon oxide vitreous powder having a particle diameter in the range of 20 to 50 µ at a 0% point and an acute angle. Composition. 【請求項４】 前記沈降防止剤がポリエチレンアマイド
である、請求項２に記載の塗料組成物。4. The coating composition according to claim 2, wherein the antisettling agent is polyethylene amide.