JPH08176469A - Powder coating and method of coating therewith - Google Patents

Powder coating and method of coating therewith

Info

Publication number
JPH08176469A
JPH08176469A JP33533294A JP33533294A JPH08176469A JP H08176469 A JPH08176469 A JP H08176469A JP 33533294 A JP33533294 A JP 33533294A JP 33533294 A JP33533294 A JP 33533294A JP H08176469 A JPH08176469 A JP H08176469A
Authority
JP
Japan
Prior art keywords
powder coating
coating material
quaternary ammonium
ammonium salt
coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP33533294A
Other languages
Japanese (ja)
Inventor
Yuichi Moriya
祐一 守屋
Kiyoshi Nishida
潔 西田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tomoegawa Co Ltd
Original Assignee
Tomoegawa Paper Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tomoegawa Paper Co Ltd filed Critical Tomoegawa Paper Co Ltd
Priority to JP33533294A priority Critical patent/JPH08176469A/en
Publication of JPH08176469A publication Critical patent/JPH08176469A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To improve the leveling properties and form a thinner coating film to thereby improve the operating efficiency by positively charging a powder coating containing a binder resin, a curing agent and a quaternary ammonium salt compound and having a specified mean particle diameter through the friction with a member containing fluorine atoms at a part for conveying the coating and then spraying the coating on an object to be coated. CONSTITUTION: The powder coating has a mean particle diameter of 5-20μm and is sprayed with a spray gun by triboelectrification using, e.g. a tetrafluoroethylene resin. The quaternary ammonium salt compound has a constitution represented by formula I (wherein R1 is 1-8C alkyl; R2 and R3 are each 1-18C alkyl; R4 is 1-8C alkyl or benzyl; and X is an anion of formula II) and is added in an amount of 0.1-5wt.% of the powder coating. Examples of the binder resin used include polyester and epoxy resins. Examples of the curing agent used include an isocyanate and an amine. The powder coating is obtained by dry mixing raw materials, thermally melting and kneading the mixture, grinding the kneaded material, and classifying the ground material.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、薄膜塗装に適した粉体
塗料及び該粉体塗料を使用する塗装方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder coating suitable for thin film coating and a coating method using the powder coating.

【0002】[0002]

【従来の技術】粉体塗料は、溶剤塗料に比べて揮発分及
び臭気等が少ないことから、公害対策及び環境規制の面
で非常に有益であることが普通に知られている。しかし
ながら、従来の粉体塗料は、平均粒子径が30μm前後
のものであり、かつ、厳密な分級がなされていないため
に、粒子径分布は非常にブロードなものであった。その
ため、レベリング性の向上、塗膜の薄膜化による作業効
率の向上及びトータルコストダウン等の市場ニーズを満
足するものではなかった。すなわち、従来の粉体塗料を
使用する場合、良好なレベリング性を有する塗膜を形成
させるためには、粒子層が2〜3層以上重なるように塗
装する必要があり、このため60μm程度の厚い塗膜を
形成させなければならないという問題があった。また、
一般に使用されている粉体塗料塗装方式としては、コロ
ナ帯電方式スプレーガンがある。この方式は、スプレー
ガンの先端に設けられたコロナ電極から生成されたコロ
ナイオンによって帯電された粉体塗料が、導電体である
被塗物と電極との間に形成された電界及び空気流に沿っ
て飛翔し、被塗物に付着するものである。しかしなが
ら、このコロナ帯電方式を用いて粉体塗料を塗装するに
は、次のような2つの技術的課題を有していることが知
られている。その第1は、ファラデーケージ効果と呼ば
れているものであって、電界(電気力線)が被塗物の凹
部に形成されないことから、その凹部には粉体塗料を少
量しか付着させることができず、またその反対に、電気
力線が集中するエッジ部には粉体塗料が多量に付着する
という問題である。その第2は、逆電離現象と呼ばれて
いるものであって、被塗装物上に堆積された粉体塗料及
び遊離コロナイオンの蓄積電荷が大きくなりすぎて火花
放電が発生し、塗装面にクレータ状の不良箇所が生じる
という問題である。
2. Description of the Related Art It is generally known that powder coating materials are very useful in terms of pollution control and environmental regulations because they have less volatile components and odors than solvent coating materials. However, the conventional powder coatings have an average particle size of about 30 μm and have not been subjected to strict classification, so that the particle size distribution is very broad. Therefore, it has not satisfied the market needs such as improvement of leveling property, improvement of working efficiency due to thinning of the coating film, and total cost reduction. That is, when a conventional powder coating material is used, it is necessary to coat so that the particle layers are overlapped by 2 to 3 layers or more in order to form a coating film having good leveling property. There was a problem that a coating film had to be formed. Also,
A commonly used powder paint coating method is a corona charging type spray gun. In this method, the powder coating material charged by corona ions generated from the corona electrode provided at the tip of the spray gun is applied to the electric field and air flow formed between the object to be coated and the electrode. It flies along and adheres to the object to be coated. However, it is known that coating the powder coating material by using this corona charging method has the following two technical problems. The first is what is called the Faraday cage effect, and since an electric field (line of electric force) is not formed in the concave portion of the object to be coated, only a small amount of powder coating can be attached to the concave portion. On the contrary, there is a problem that a large amount of powder coating material adheres to the edge portion where the lines of electric force are concentrated. The second is what is called the reverse ionization phenomenon, in which the accumulated charge of the powder coating material and free corona ions deposited on the object to be coated becomes too large and spark discharge occurs, causing This is a problem that crater-like defects occur.

【0003】これらの問題を解決させる方法として、近
年、トリボ帯電方式スプレーガンを用いる塗装方法が使
用されてきている。この方式は、空気流によって搬送さ
れる粉体塗料がスプレーガンの内壁との摩擦によって帯
電し、空気流のみによって被塗物まで飛翔して付着する
ものであって、電界が形成されないことから凹部にも粉
体塗料が良好に付着し、また、遊離イオンが発生しない
ので逆電離現象が起きにくいという利点を有している。
しかしながら、トリボ帯電方式は、粉体塗料の帯電が摩
擦のみに依存しているものであるから、絶対的な帯電量
はコロナ帯電方式よりも低くなり、粉体塗料のスプレー
ガンからの吐出速度を上げると十分な帯電量が得られな
いこと及び連続して使用するとスプレーガン内壁に摩擦
電荷が蓄積されるために粉体塗料の摩擦帯電量が低下し
て被塗物への付着が不十分になる等の問題点が存在する
ことが知られている。さらに、摩擦帯電現象は、温度・
湿度などの環境条件に左右されやすく、特に湿度の高い
条件下では十分な摩擦帯電量を得られ難いという問題も
ある。
As a method of solving these problems, a coating method using a tribo-charging type spray gun has been used in recent years. In this method, the powder coating material carried by the air flow is charged by friction with the inner wall of the spray gun, and flies to and adheres to the object to be coated only by the air flow. In addition, the powder coating adheres well, and since free ions are not generated, the reverse ionization phenomenon is less likely to occur.
However, in the tribo charging method, the charging of the powder coating depends only on friction, so the absolute charging amount is lower than in the corona charging method, and the discharge speed of the powder coating from the spray gun is reduced. If it is raised, a sufficient charge cannot be obtained, and if it is continuously used, the triboelectric charge accumulates on the inner wall of the spray gun, which reduces the triboelectric charge of the powder coating, resulting in insufficient adhesion to the object to be coated. It is known that there are problems such as Furthermore, the triboelectrification phenomenon is
There is also a problem that it is easily affected by environmental conditions such as humidity, and it is difficult to obtain a sufficient triboelectric charge amount particularly under conditions of high humidity.

【0004】[0004]

【発明が解決しようとする課題】本発明は、上記した問
題を解消するためになされたものであって、その目的
は、塗膜を薄膜化できる小粒径の粉体塗料を提供するこ
と、及びその粉体塗料をトリボ帯電方式のスプレーガン
に適用することにより、レベリング性の向上及び塗膜の
薄膜化による作業効率の向上を図るとともに、連続使用
しても被塗物への付着性が保持され、広範囲の環境条件
下において使用可能な粉体塗料の塗装方法を提供するこ
とにある。
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a powder coating having a small particle diameter capable of thinning a coating film, And by applying the powder coating material to a tribo-charging type spray gun, the leveling property is improved and the work efficiency is improved by thinning the coating film, and the adhesiveness to the coated object is improved even if it is continuously used. It is an object of the present invention to provide a method for coating a powder coating which is retained and can be used under a wide range of environmental conditions.

【0005】[0005]

【課題を解決するための手段】本発明の粉体塗料は、少
なくとも結着樹脂、硬化剤及び第4級アンモニウム塩化
物を含有してなり、かつ、平均粒子径が5〜20μmで
あることを特徴とする。また、本発明の塗装方法は、塗
料搬送部に設置されたフッ素原子を含有する部材との摩
擦で正極性に帯電した後、被塗物に吹付けることを特徴
とする。このフッ素原子を含有する部材が、トリボ帯電
方式スプレーガンの塗料搬送部に設置されていることが
好ましい。
The powder coating composition of the present invention comprises at least a binder resin, a curing agent and a quaternary ammonium chloride and has an average particle size of 5 to 20 μm. Characterize. Further, the coating method of the present invention is characterized in that after being positively charged by friction with a member containing a fluorine atom installed in the coating material conveying section, it is sprayed onto the object to be coated. It is preferable that the member containing the fluorine atom is installed in the coating material conveying section of the tribo-charging type spray gun.

【0006】以下、本発明を詳細に説明する。本発明の
粉体塗料は、少なくとも結着樹脂及び硬化剤を含有する
粉体粒子からなるものである。この結着樹脂として使用
できるものとしては、ポリエステル樹脂、エポキシ樹
脂、アクリル樹脂、フェノール樹脂、キシレン樹脂、ユ
リヤ樹脂及びメラミン樹脂等を挙げることができる。ま
た、硬化剤として使用できるものとしては、イソシアネ
ート、アミン、ポリアミド、酸無水物、ポリスルフィ
ド、三フッ化ホウ素酸、酸ジヒドラジド及びイミダゾー
ル等を挙げることができる。さらに、粉体粒子には、硫
酸バリウム、炭酸カルシウム、酸化アルミニウム、ケイ
酸カルシウム等の充填剤、アクリルオリゴマー、シリコ
ーン等の流展剤、酸化チタン、酸化クロム、酸化鉄、カ
ーボンブラック等の着色剤、発泡防止剤等を適宜添加す
ることができる。
The present invention will be described in detail below. The powder coating material of the present invention comprises powder particles containing at least a binder resin and a curing agent. Examples of the binder resin that can be used include polyester resin, epoxy resin, acrylic resin, phenol resin, xylene resin, urea resin and melamine resin. Further, examples of usable curing agents include isocyanates, amines, polyamides, acid anhydrides, polysulfides, trifluoroboric acid, acid dihydrazides and imidazoles. Further, powder particles include fillers such as barium sulfate, calcium carbonate, aluminum oxide and calcium silicate, leveling agents such as acrylic oligomer and silicone, coloring agents such as titanium oxide, chromium oxide, iron oxide and carbon black. A foaming inhibitor and the like can be added as appropriate.

【0007】この粉体塗料は、上記の組成物を乾式混合
し、熱溶融混練した後、粉砕、分級することによって製
造するか、または上記の組成物を懸濁重合法又は乳化重
合法等の重合法によって製造することができる。本発明
に使用する粉体粒子の粒子径としては、コールターカウ
ンターTAII型で測定される体積50%径が5〜20μ
mの範囲のものであることが必要である。体積50%径
が5μm未満の粉体粒子は、ファンデルワールス力等に
起因する粒子間力が大きくなることによって、凝集し易
くなり、粉体としての流動性が悪化するため粉体塗料と
して実用的でない。また、このような小粒径の粉体粒子
を一般的な溶融混練、粉砕分級方法で製造しようとする
と、粉砕分級工程において大きなエネルギーを必要とす
るため、製造コストがかなり上昇することになる。ま
た、体積50%径が20μmを超えると、被塗布面に薄
く均一な粉体付着層を得ることができず、したがって、
良好な薄膜を得ることはできない。
This powder coating composition is produced by dry-mixing the above-mentioned compositions, hot-melt kneading, and then pulverizing and classifying, or by subjecting the above-mentioned compositions to a suspension polymerization method or an emulsion polymerization method. It can be produced by a polymerization method. The particle size of the powder particles used in the present invention is 50% by volume of 50% volume measured by Coulter counter TAII type.
It must be in the m range. Powder particles with a volume 50% diameter of less than 5 μm tend to agglomerate due to the increased interparticle force due to van der Waals forces, etc., and the fluidity of the powder deteriorates. Not relevant. If an attempt is made to manufacture such powder particles having a small particle diameter by a general melt-kneading and pulverizing and classifying method, a large amount of energy is required in the pulverizing and classifying step, so that the manufacturing cost will be considerably increased. If the volume 50% diameter exceeds 20 μm, a thin and uniform powder adhesion layer cannot be obtained on the surface to be coated, and therefore,
A good thin film cannot be obtained.

【0008】また、本発明は、粉体塗料の構成成分とし
て第4級アンモニウム塩化合物を使用することを特徴と
しているものである。この第4級アンモニウム塩化合物
の使用によって摩擦帯電の立ち上がり時間を短縮できる
から、トリボ方式のスプレーガン内部で十分な帯電量ま
で容易に帯電させることができる上に、従来、帯電不良
が発生し易かった高湿環境等のもとでも実用上十分な帯
電量を得ることができるものである。さらに、第4級ア
ンモニウム塩化合物は、殆んど無色又は淡色のものであ
るから、粉体塗料のカラーマッチングの障害となること
はない。
Further, the present invention is characterized in that a quaternary ammonium salt compound is used as a constituent component of the powder coating material. By using this quaternary ammonium salt compound, the rise time of triboelectric charging can be shortened, so that it is possible to easily charge up to a sufficient amount of charge inside the tribo-type spray gun, and in the past, charging failure was likely to occur. It is possible to obtain a sufficient amount of charge for practical use even in a high humidity environment. Furthermore, since the quaternary ammonium salt compound is almost colorless or light-colored, it does not hinder the color matching of the powder coating material.

【0009】本発明で使用される第4級アンモニウム塩
化合物としては、
The quaternary ammonium salt compound used in the present invention includes:

【化3】 (式中、R1 はC1 〜C8 のアルキル基、R2 及びR3
はC1 〜C18のアルキル基、R4 はC1 〜C8 のアルキ
ル基又はベンジル基、Xはアニオンを示す。)で示され
る化合物が用いられる。特に、アニオンとしては、
Embedded image (In the formula, R 1 is a C 1 -C 8 alkyl group, R 2 and R 3
Represents a C 1 -C 18 alkyl group, R 4 represents a C 1 -C 8 alkyl group or a benzyl group, and X represents an anion. ) Is used. In particular, as the anion,

【化4】 を用いた、第4級アンモニウム塩とナフトールスルホン
酸との造塩化合物が好適に用いられる。
[Chemical 4] A salt-forming compound of quaternary ammonium salt and naphtholsulfonic acid is preferably used.

【0010】本発明に用いられる第4級アンモニウム塩
化合物の例を以下に示す。
Examples of the quaternary ammonium salt compound used in the present invention are shown below.

【化5】 第4級アンモニウム塩化合物の添加量は、0.1〜5重
量%の範囲、好ましくは0.5〜3重量%が好適に用い
られる。0.1重量%以下の添加量では帯電性に寄与し
ないし、また、5重量%以上の添加量では結着樹脂への
分散性が悪化して焼付け時に塗膜状態が不良になりやす
い。
Embedded image The amount of the quaternary ammonium salt compound added is suitably in the range of 0.1 to 5% by weight, preferably 0.5 to 3% by weight. If the addition amount is 0.1% by weight or less, it does not contribute to the charging property, and if the addition amount is 5% by weight or more, the dispersibility in the binder resin is deteriorated and the state of the coating film tends to be poor during baking.

【0011】本発明の粉体塗料粒子には、必要に応じ
て、シリカ、アルミナ、酸化チタン等の無機微粒子をそ
の表面に付着させてもよい。無機微粒子を粉体粒子の表
面に付着させるには、両者をヘンシェルミキサー(三井
三池社製)及びスーパーミキサー(川田製作所社製)等
の高速ミキサーによって乾式混合することにより行な
う。
Inorganic fine particles such as silica, alumina and titanium oxide may be attached to the surface of the powder coating material particles of the present invention, if necessary. In order to adhere the inorganic fine particles to the surface of the powder particles, they are dry-mixed with a high-speed mixer such as a Henschel mixer (manufactured by Mitsui Miike Co., Ltd.) and a super mixer (manufactured by Kawada Seisakusho Co., Ltd.).

【0012】本発明の粉体塗料は、トリボ帯電方式のス
プレーガンに好適に用いられる。スプレーガン内部の粉
体塗料搬送部は、フッ素原子を含有する部材で形成され
ているか又は表面処理されている必要がある。フッ素原
子を含有する部材は、長期間継続使用しても物理的な劣
化が少ないという利点を有するとともに、強い負帯電性
を有するために、この部材と粉体塗料との摩擦によっ
て、粉体塗料側を正極性に帯電させることができる。フ
ッ素原子を含有する部材として使用されるものとして
は、ポリテトラフルオロエチレン、ポリトリフルオロク
ロルエチレン、ポリフッ化ビニル、ポリフッ化ビニリデ
ン、ポリジクロルジフルオロエチレン等を挙げることが
できる。
The powder coating material of the present invention is suitable for use in a tribo-charging type spray gun. The powder coating material conveying section inside the spray gun must be formed of a member containing a fluorine atom or be surface-treated. A member containing a fluorine atom has an advantage that physical deterioration is small even if it is continuously used for a long period of time, and has a strong negative charging property. The side can be positively charged. Examples of the member used as a member containing a fluorine atom include polytetrafluoroethylene, polytrifluorochloroethylene, polyvinyl fluoride, polyvinylidene fluoride and polydichlorodifluoroethylene.

【0013】[0013]

【実施例】以下、実施例に基づいて本発明を具体的に説
明する。 実施例1 ポリエステル樹脂 54.8重量% (商品名:ER−6680、日本エステル社製) ブロックイソシアネート 10.2重量% (商品名:BF−1540、ダイセルヒュルス社製) 二酸化チタン 33.0重量% (商品名:CR−90、石原産業社製) 第4級アンモニウム塩化合物 1.0重量% [上記式(1)で示される化合物] 流展剤 0.66重量% (商品名:アクロナール4F、BASF社製) 発泡防止剤 0.34重量% (商品名:ベンゾイン、みどり化学社製) 上記の配合比からなる原料をスーパーミキサーで混合
し、加圧ニーダーにより120℃で熱混練した後、ジェ
ットミルで粉砕し、その後乾式気流分級機で体積50%
径が13μmとなるように分級した。この粉体100重
量部とアミノシランカップリング剤で処理されたシリカ
0.4重量部とを、ヘンシェルミキサーで撹拌混合して
粉体塗料を得た。次いで、得られた粉体塗料を、塗料搬
送部に4フッ化エチレン樹脂を使用したトリボ帯電方式
スプレーガンに適用し、ブライト仕上げされたリン酸亜
鉛処理鋼板(SPCC−SB板)に膜厚が30μmとな
るように吹き付けを行った後、200℃で焼付けを行っ
た。
EXAMPLES The present invention will be specifically described below based on examples. Example 1 Polyester resin 54.8% by weight (Brand name: ER-6680, manufactured by Nippon Ester Co., Ltd.) Block isocyanate 10.2% by weight (Brand name: BF-1540, manufactured by Daicel Hüls) Titanium dioxide 33.0% by weight % (Brand name: CR-90, manufactured by Ishihara Sangyo Co., Ltd.) Quaternary ammonium salt compound 1.0 wt% [Compound represented by the above formula (1)] Leveling agent 0.66 wt% (Brand name: Acronal 4F , BASF) Antifoaming agent 0.34% by weight (trade name: benzoin, manufactured by Midori Kagaku Co., Ltd.) The raw materials having the above blending ratios are mixed with a super mixer, and after heat kneading with a pressure kneader at 120 ° C., Grind with a jet mill, then dry air classifier with 50% volume
The particles were classified so that the diameter was 13 μm. 100 parts by weight of this powder and 0.4 parts by weight of silica treated with an aminosilane coupling agent were mixed by stirring with a Henschel mixer to obtain a powder coating material. Then, the obtained powder coating material was applied to a tribo-charging system spray gun using a tetrafluoroethylene resin in the coating material conveying section, and a zinc phosphate-treated steel sheet (SPCC-SB board) having a bright finish had a film thickness of After spraying to have a thickness of 30 μm, baking was performed at 200 ° C.

【0014】実施例2 ポリエステル樹脂 54.8重量% (商品名:ER−6680、日本エステル社製) ブロックイソシアネート 10.2重量% (商品名:BF−1540、ダイセルヒュルス社製) 二酸化チタン 33.0重量% (商品名:CR−90、石原産業社製) 第4級アンモニウム塩化合物 1.0重量% [上記式(2)で示される化合物] 流展剤 0.66重量% (商品名:アクロナール4F、BASF社製) 発泡防止剤 0.34重量% (商品名:ベンゾイン、みどり化学社製) 上記の配合比からなる原料をスーパーミキサーで混合
し、加圧ニーダーにより120℃で熱混練した後、ジェ
ットミルで粉砕し、その後乾式気流分級機で体積50%
径が13μmとなるように分級した。この粉体100重
量部とアミノシランカップリング剤で処理されたシリカ
0.4重量部とをヘンシェルミキサーで撹拌混合して粉
体塗料を得た。次いで、得られた粉体塗料を、塗料搬送
部に4フッ化エチレン樹脂を使用したトリボ帯電方式ス
プレーガンに適用し、ブライト仕上げされたリン酸亜鉛
処理鋼板(SPCC−SB板)に膜厚が30μmとなる
ように吹き付けを行った後、200℃で焼付けを行っ
た。
Example 2 Polyester resin 54.8% by weight (trade name: ER-6680, manufactured by Nippon Ester Co., Ltd.) 10.2% by weight of blocked isocyanate (trade name: BF-1540, manufactured by Daicel Hüls) Titanium dioxide 33 0.0 wt% (trade name: CR-90, manufactured by Ishihara Sangyo Co., Ltd.) quaternary ammonium salt compound 1.0 wt% [compound represented by the above formula (2)] extender 0.66 wt% (trade name : Acronal 4F, manufactured by BASF) Antifoaming agent 0.34% by weight (trade name: benzoin, manufactured by Midori Kagaku Co., Ltd.) The raw materials having the above mixing ratios are mixed with a super mixer, and heat kneaded with a pressure kneader at 120 ° C. After crushing, pulverize with a jet mill, and then dry air classifier with a volume of 50%
The particles were classified so that the diameter was 13 μm. 100 parts by weight of this powder and 0.4 parts by weight of silica treated with an aminosilane coupling agent were mixed by stirring with a Henschel mixer to obtain a powder coating material. Then, the obtained powder coating material was applied to a tribo-charging system spray gun using a tetrafluoroethylene resin in the coating material conveying section, and a zinc phosphate-treated steel sheet (SPCC-SB board) having a bright finish had a film thickness of After spraying to have a thickness of 30 μm, baking was performed at 200 ° C.

【0015】比較例1 実施例1と同一配合比の原料をスーパーミキサーで混合
し、加圧ニーダーにより120℃で熱混練した後、ジェ
ットミルで粉砕し、その後乾式気流分級機で体積50%
径が4.8μmとなるように分級した。この粉体100
重量部とアミノシランカップリング剤で処理されたシリ
カ0.4重量部とをヘンシェルミキサーで撹拌混合して
粉体塗料を得た。次いで、得られた粉体塗料を、塗料搬
送部に4フッ化エチレン樹脂を使用したトリボ帯電方式
スプレーガンに適用し、ブライト仕上げされたリン酸亜
鉛処理鋼板(SPCC−SB板)に膜厚が30μmとな
るように吹き付けを行った後、200℃で焼付けを行っ
た。
Comparative Example 1 Raw materials having the same mixing ratio as in Example 1 were mixed in a super mixer, heat kneaded at 120 ° C. by a pressure kneader, pulverized by a jet mill, and then 50% in volume by a dry air stream classifier.
The particles were classified so that the diameter was 4.8 μm. This powder 100
Part by weight and 0.4 part by weight of silica treated with an aminosilane coupling agent were mixed by stirring with a Henschel mixer to obtain a powder coating material. Then, the obtained powder coating material was applied to a tribo-charging system spray gun using a tetrafluoroethylene resin in the coating material conveying section, and a zinc phosphate-treated steel sheet (SPCC-SB board) having a bright finish had a film thickness of After spraying to have a thickness of 30 μm, baking was performed at 200 ° C.

【0016】比較例2 実施例1と同一配合比の原料をスーパーミキサーで混合
し、加圧ニーダーにより120℃で熱混練した後、ジェ
ットミルで粉砕し、その後乾式気流分級機で体積50%
径が26.0μmとなるように分級した。この粉体10
0重量部とアミノシランカップリング剤で処理されたシ
リカ0.4重量部とをヘンシェルミキサーで撹拌混合し
て粉体塗料を得た。次いで、得られた粉体塗料を、塗料
搬送部に4フッ化エチレン樹脂を使用したトリボ帯電方
式スプレーガンに適用し、ブライト仕上げされたリン酸
亜鉛処理鋼板(SPCC−SB板)に膜厚が30μmと
なるように吹き付けを行った後、200℃で焼付けを行
った。
Comparative Example 2 Raw materials having the same blending ratio as in Example 1 were mixed in a super mixer, heat kneaded at 120 ° C. by a pressure kneader, pulverized by a jet mill, and then 50% in volume by a dry air stream classifier.
The particles were classified so that the diameter was 26.0 μm. This powder 10
0 parts by weight and 0.4 parts by weight of silica treated with an aminosilane coupling agent were mixed by stirring with a Henschel mixer to obtain a powder coating material. Then, the obtained powder coating material was applied to a tribo-charging system spray gun using a tetrafluoroethylene resin in the coating material conveying section, and a zinc phosphate-treated steel sheet (SPCC-SB board) having a bright finish had a film thickness of After spraying to have a thickness of 30 μm, baking was performed at 200 ° C.

【0017】比較例3 ポリエステル樹脂 55.8重量% (商品名:ER−6680、日本エステル社製) ブロックイソシアネート 10.2重量% (商品名:BF−1540、ダイセルヒュルス社製) 二酸化チタン 33.0重量% (商品名:CR−90、石原産業社製) 流展剤 0.66重量% (商品名:アクロナール4F、BASF社製) 発泡防止剤 0.34重量% (商品名:ベンゾイン、みどり化学社製) 上記の配合比からなる原料をスーパーミキサーで混合
し、加圧ニーダーにより120℃で熱混練した後、ジェ
ットミルで粉砕し、その後乾式気流分級機で体積50%
径が13μmとなるように分級した。この粉体100重
量部とアミノシランカップリング剤で処理されたシリカ
0.4重量部とをヘンシェルミキサーで撹拌混合して粉
体塗料を得た。次いで、得られた粉体塗料を、塗料搬送
部に4フッ化エチレン樹脂を使用したトリボ帯電方式ス
プレーガンに適用し、ブライト仕上げされたリン酸亜鉛
処理鋼板(SPCC−SB板)に膜厚が30μmとなる
ように吹き付けを行った後、200℃で焼付けを行っ
た。
Comparative Example 3 Polyester resin 55.8% by weight (Brand name: ER-6680, manufactured by Nippon Ester Co., Ltd.) Block isocyanate 10.2% by weight (Brand name: BF-1540, manufactured by Daicel Hüls) Titanium dioxide 33 0.0% by weight (trade name: CR-90, manufactured by Ishihara Sangyo Co., Ltd.) 0.66% by weight of leveling agent (trade name: ACRONAL 4F, manufactured by BASF) Antifoaming agent 0.34% by weight (trade name: benzoin, (Midori Kagaku Co., Ltd.) The raw materials having the above blending ratios are mixed in a supermixer, heat kneaded at 120 ° C. by a pressure kneader, pulverized by a jet mill, and then 50% by volume in a dry airflow classifier.
The particles were classified so that the diameter was 13 μm. 100 parts by weight of this powder and 0.4 parts by weight of silica treated with an aminosilane coupling agent were mixed by stirring with a Henschel mixer to obtain a powder coating material. Then, the obtained powder coating material was applied to a tribo-charging system spray gun using a tetrafluoroethylene resin in the coating material conveying section, and a zinc phosphate-treated steel sheet (SPCC-SB board) having a bright finish had a film thickness of After spraying to have a thickness of 30 μm, baking was performed at 200 ° C.

【0018】実施例1〜2及び比較例1〜3について、
それぞれの吹き付け状態及び焼き付け後の塗膜面を評価
した。その結果を表1に示した。なお、比較例2では、
表面が平滑な薄膜は得られなかったが、膜厚を60μm
にしたところ良好な塗面を得ることができた。
Regarding Examples 1-2 and Comparative Examples 1-3,
Each sprayed state and the coating surface after baking were evaluated. The results are shown in Table 1. In Comparative Example 2,
A thin film with a smooth surface could not be obtained, but the film thickness was 60 μm.
As a result, a good coated surface could be obtained.

【表1】 表1から明らかなように、本発明では、粉体塗料の噴霧
量に対する被塗物への塗着効率が良好であり、塗着時の
環境条件に左右されず、焼付け後の塗膜面も良好な粉体
塗料の塗装方法を得ることができる。
[Table 1] As is clear from Table 1, in the present invention, the coating efficiency with respect to the spray amount of the powder coating material is good, is not affected by the environmental conditions during coating, and the coating surface after baking is also A good powder coating method can be obtained.

【0019】[0019]

【発明の効果】本発明の粉体塗料は、平均粒子径が5〜
20μmの範囲のものであるために、塗膜の薄膜化が可
能であり、また、特定の第4級アンモニウム塩化合物を
添加していることにより、高温高湿環境下でも塗料搬送
部に設置されたフッ素原子を含有する部材との摩擦によ
って適正な帯電量にまで正極性に帯電させることができ
る。したがって、本発明の塗装方法によれば、レベリン
グ性の向上及び塗膜の薄膜化による作業効率の向上を図
ることができるとともに、連続使用時においても被塗物
への粉体塗料の付着性が保持され、しかも、広範囲の環
境条件下で使用可能であって、焼付け後も良好な塗面を
得ることができるものである。
The powder coating material of the present invention has an average particle size of 5 to 5.
Since it is in the range of 20 μm, it is possible to make the coating film thin, and by adding a specific quaternary ammonium salt compound, it can be installed in the paint transport section even in a high temperature and high humidity environment. Further, by friction with a member containing a fluorine atom, it can be positively charged to an appropriate charge amount. Therefore, according to the coating method of the present invention, it is possible to improve the leveling property and the work efficiency by thinning the coating film, and at the time of continuous use, the adhesion of the powder coating material to the object to be coated is improved. It is retained and can be used under a wide range of environmental conditions, and a good coated surface can be obtained even after baking.

Claims (6)

【特許請求の範囲】[Claims] 【請求項1】 少なくとも結着樹脂、硬化剤及び第4級
アンモニウム塩化合物を含有してなり、かつ、平均粒子
径が5〜20μmであることを特徴とする粉体塗料。
1. A powder coating material comprising at least a binder resin, a curing agent and a quaternary ammonium salt compound, and having an average particle diameter of 5 to 20 μm.
【請求項2】 使用する第4級アンモニウム塩化合物
が、下記構造式[1]で示される化合物であることを特
徴とする請求項1記載の粉体塗料。 【化1】 (式中、R1 はC1 〜C8 のアルキル基、R2 及びR3
はC1 〜C18のアルキル基、R4 はC1 〜C8 のアルキ
ル基又はベンジル基、Xはアニオンを示す。)
2. The powder coating composition according to claim 1, wherein the quaternary ammonium salt compound used is a compound represented by the following structural formula [1]. Embedded image (In the formula, R 1 is a C 1 -C 8 alkyl group, R 2 and R 3
Represents a C 1 -C 18 alkyl group, R 4 represents a C 1 -C 8 alkyl group or a benzyl group, and X represents an anion. )
【請求項3】 請求項2記載の第4級アンモニウム塩に
おいて、Xが下記構造式[2]で示される化合物である
ことを特徴とする請求項2記載の粉体塗料。 【化2】
3. The powder coating composition according to claim 2, wherein in the quaternary ammonium salt according to claim 2, X is a compound represented by the following structural formula [2]. Embedded image
【請求項4】 第4級アンモニウム塩の添加量が、粉体
塗料中の0.1〜5重量%であることを特徴とする請求
項1記載の粉体塗料。
4. The powder coating material according to claim 1, wherein the amount of the quaternary ammonium salt added is 0.1 to 5% by weight of the powder coating material.
【請求項5】 少なくとも結着樹脂、硬化剤及び第4級
アンモニウム塩化合物を含有してなり、かつ、平均粒子
径が5〜20μmである粉体塗料を、塗料搬送部にフッ
素原子を含有する部材との摩擦で正極性に帯電させた
後、被塗物に吹付けることを特徴とする粉体塗料の塗装
方法。
5. A powder coating material containing at least a binder resin, a curing agent and a quaternary ammonium salt compound, and having a mean particle size of 5 to 20 μm, wherein the coating material conveying section contains a fluorine atom. A method for coating a powder coating material, which comprises electrically charging to a positive polarity by friction with a member and then spraying it onto an object to be coated.
【請求項6】 フッ素原子を含有する部材が、トリボ帯
電方式スプレーガンの塗料搬送部に設置されていること
を特徴とする請求項5記載の粉体塗料の塗装方法。
6. The coating method for powder coating material according to claim 5, wherein the member containing a fluorine atom is installed in the coating material conveying section of the tribo-charging type spray gun.
JP33533294A 1994-12-22 1994-12-22 Powder coating and method of coating therewith Pending JPH08176469A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP33533294A JPH08176469A (en) 1994-12-22 1994-12-22 Powder coating and method of coating therewith

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP33533294A JPH08176469A (en) 1994-12-22 1994-12-22 Powder coating and method of coating therewith

Publications (1)

Publication Number Publication Date
JPH08176469A true JPH08176469A (en) 1996-07-09

Family

ID=18287338

Family Applications (1)

Application Number Title Priority Date Filing Date
JP33533294A Pending JPH08176469A (en) 1994-12-22 1994-12-22 Powder coating and method of coating therewith

Country Status (1)

Country Link
JP (1) JPH08176469A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2828008B1 (en) 2012-03-21 2020-06-03 Swimc Llc Method for powder coating

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2828008B1 (en) 2012-03-21 2020-06-03 Swimc Llc Method for powder coating

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