JPS6059028B2 - How to paint the inner surface of metal tubes - Google Patents
How to paint the inner surface of metal tubesInfo
- Publication number
- JPS6059028B2 JPS6059028B2 JP9111580A JP9111580A JPS6059028B2 JP S6059028 B2 JPS6059028 B2 JP S6059028B2 JP 9111580 A JP9111580 A JP 9111580A JP 9111580 A JP9111580 A JP 9111580A JP S6059028 B2 JPS6059028 B2 JP S6059028B2
- Authority
- JP
- Japan
- Prior art keywords
- inorganic particles
- layer
- paint
- metal tube
- 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.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Description
【発明の詳細な説明】
本発明は金属管、特に鋳鉄管の内面塗装方法の改良に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the method for coating the inner surface of metal pipes, particularly cast iron pipes.
鋳鉄管の内面塗装において、内面に微細な凹部、例えば
ピンホールが存在すると、平滑表面の塗膜を得ることが
困難てある。When painting the inner surface of a cast iron pipe, if minute recesses, such as pinholes, exist on the inner surface, it is difficult to obtain a coating film with a smooth surface.
ところで、塗料においては、塗膜の動性、例えは塗膜剥
離に重大な影響を与える熱収縮性、或いは塗膜の耐衝撃
荷重強度に重大な影響を与える硬度等を改良するために
、無機質充填材、例えばシリカ粒子を塗料に混合するこ
とが公知である。Incidentally, in paints, inorganic materials are used to improve the dynamic properties of the paint film, such as heat shrinkage, which has a significant effect on paint film peeling, and hardness, which has a significant impact on the impact load resistance of the paint film. It is known to mix fillers, such as silica particles, into paints.
而るに、金属管の内面塗装においては、一般に、金属管
を回転させ、この回転中の金属管の内面に塗料を吹付け
る方法が使用されている。この内面塗装において、塗料
に上記無機質充填材、例えシリカ粒子を配合したものを
用いると塗膜が硬化するまでの間に、無機質粒子が、ベ
ース塗料との比重の相違並びに回転遠心力のためにベー
ス塗料から分離しようとする。しかし、かゝる分離は、
無機質粒子を均一に塗膜中に分散させて、塗膜の諸物性
を改良しようとする本来の目的に反し、このため、従来
においては、上記分離を排除するように金属管の回転速
度、無機質粒子の性状、無機質粒子の配合割合等を規制
している。However, when painting the inner surface of a metal tube, a method is generally used in which the metal tube is rotated and paint is sprayed onto the inner surface of the metal tube while it is rotating. In this internal coating, if the above-mentioned inorganic filler, for example silica particles, is used in the paint, the inorganic particles will be absorbed by the paint before the paint film hardens due to the difference in specific gravity with the base paint and due to rotational centrifugal force. Try to separate it from the base paint. However, such separation
Contrary to the original purpose of uniformly dispersing inorganic particles in a coating film to improve various physical properties of the coating film, conventionally, the rotational speed of the metal tube and the inorganic particles have been adjusted to eliminate the above separation. The properties of particles and the blending ratio of inorganic particles are regulated.
しかしながら、上記無機質粒子の分離のもとでは、金属
管内面の微細凹部、例えはピンホールを無機質粒子て充
填てき、従つて、金属管内面に、ピンホール等の存在に
もかゝわらず、平滑な塗膜を形成てきる。However, under the above-mentioned separation of inorganic particles, the inorganic particles fill minute recesses, such as pinholes, on the inner surface of the metal tube, and therefore, despite the presence of pinholes, etc. on the inner surface of the metal tube, Forms a smooth coating film.
本発明に係る金属管内面の塗装方法は、上記無機質粒子
の分離を利用して、金属管内面の微細凹部の存在にもか
）わらず、塗膜の平滑化を可能にＪする方法であり、回
転中の金属管の内面に、多量の無機質粒子を添加した樹
脂塗料の第１層を設け無機質粒子を少量添加または無添
加の樹脂塗料の第２層を上記第１層上に設け、上記第１
層中の無機質粒子を回転遠心力により樹脂を付着させた
状態で金属管内面の微細凹部に充填させることを特徴と
する方法である。The method for painting the inner surface of a metal tube according to the present invention is a method that makes it possible to smooth the coating film despite the presence of minute recesses on the inner surface of the metal tube by utilizing the above-mentioned separation of inorganic particles. , a first layer of resin paint to which a large amount of inorganic particles have been added is provided on the inner surface of the rotating metal tube, a second layer of resin paint to which a small amount or no inorganic particles have been added is provided on the first layer, and the above-mentioned 1st
This method is characterized by filling minute recesses on the inner surface of a metal tube with the inorganic particles in the layer adhered to the resin by rotational centrifugal force.
本発明を実施するには、加熱した鋳鉄管（加熱温度：１
８０〜２００℃）をターニングローラー上で回転させ、
樹脂塗料に無機質粒子を多量に配合した塗料を回転中の
鋳鉄管の内面に、スプレー法、トラフ法等により第１層
として塗布する。To carry out the present invention, a heated cast iron pipe (heating temperature: 1
80-200℃) on a turning roller,
A resin paint containing a large amount of inorganic particles is applied as a first layer to the inner surface of a rotating cast iron pipe by a spray method, a trough method, or the like.
更に、樹脂塗料に無機質粒子を少量配合または無添加の
塗料を、スプレー法、トラフ法等により、鋳鉄管の回転
を継続しつつ、上記第１層上に第２層として塗布する。
第１図は、塗布初期の状態を示し、各塗布層中Ａｌ，ａ
２での無機質粒子Ｂ，ｂ・・・・・・の分散状態は均一
てあり、鋳鉄管内面のピンホールは未充填のま）てある
。Further, a resin paint containing a small amount of inorganic particles or no additive is applied as a second layer onto the first layer by a spray method, a trough method, or the like while the cast iron pipe continues to rotate.
Figure 1 shows the state at the initial stage of coating, and shows the state of Al, a in each coating layer.
In No. 2, the dispersion state of the inorganic particles B, b, etc. was uniform, and the pinholes on the inner surface of the cast iron pipe remained unfilled.
各塗布層Ａｌ，ａ２中の無機質粒子Ｂ，ｂ・・・・・・
は回転遠心力を受け、而して、第１層−１の無機質粒子
においては、その配合量が多量であるために、回転遠心
力により分離される量が多く、第２図に示すように、こ
の分離無機質粒子で、ピンホールＣ，ｃ・・・・・が完
全に充填されるに至る。Inorganic particles B, b in each coating layer Al, a2...
is subjected to rotational centrifugal force, and since the amount of inorganic particles in the first layer-1 is large, a large amount is separated by rotational centrifugal force, as shown in Figure 2. , the pinholes C, c... are completely filled with the separated inorganic particles.
無機質粒子は、樹脂が付着された状態でピンホールに浸
入するから、ピンホール内の無機質粒子は、塗膜の；硬
化と共に付着塗料で固められてしまう。上記のように管
内面のピンホールが充填される結果、第２層Ａ２の表面
には、ピンホールの影響は出現しない。Since the inorganic particles enter the pinhole with the resin attached, the inorganic particles in the pinhole are hardened by the adhering paint as the coating film hardens. As a result of filling the pinholes on the inner surface of the tube as described above, the influence of the pinholes does not appear on the surface of the second layer A2.
しかも、第２層Ａ２には、無機質粒子が無添加または少
量添加の樹脂塗料を使用していこるから、無機質粒子の
添加による塗膜面の凹凸化もない。従つて、表面平滑な
内面塗装が可能になる。Moreover, since a resin coating with no or a small amount of inorganic particles added is used for the second layer A2, the coating surface does not become uneven due to the addition of inorganic particles. Therefore, it is possible to coat the inner surface with a smooth surface.
本発明において、樹脂塗料には、粉末、液体の何れも使
用できる。液状樹脂塗料には、２００００〜３００００
ポイズの溶剤系またはエマルジョン塗料を使用でき、例
えば、タールエポキシ塗料，エポキシ塗料，ポリエステ
ル塗料，ウレタン塗料，アクリル塗料等を使用できる。
無機質粒子には、嵩比重：１．４〜２．へ粒度：６０〜
１００メッシュのものが使用され、例えば、シリカ粉を
使用できる。In the present invention, the resin coating can be either powder or liquid. 20,000 to 30,000 for liquid resin paint
Poise solvent-based or emulsion paints can be used, such as tar epoxy paints, epoxy paints, polyester paints, urethane paints, acrylic paints, and the like.
The inorganic particles have a bulk specific gravity of 1.4 to 2. Particle size: 60~
100 mesh is used, for example, silica powder can be used.
第１層に使用する塗料での樹脂塗料：無機質粒子の混合
比（重量比）は、通常、１：１〜５好ましくは１：２〜
４てあり、第２層に使用する塗料での樹脂塗料：無機質
粒子の混合比は、１：０〜１である。The mixing ratio (weight ratio) of resin paint to inorganic particles in the paint used for the first layer is usually 1:1 to 5, preferably 1:2 to
4, and the mixing ratio of resin paint to inorganic particles in the paint used for the second layer is 1:0 to 1.
金属管の回転周速は、通常０，５〜４ｍ／ｓであり、塗
布時間は、通常１分〜５分である。The rotation peripheral speed of the metal tube is usually 0.5 to 4 m/s, and the coating time is usually 1 minute to 5 minutes.
各層の厚さは０．５〜１ｗＲである。本発明において、
第１層は、まず無機質粒子をスプレー法により散布し、
その上に液状樹脂塗料をスプレー法により散布すること
によつて設けることもできる。The thickness of each layer is 0.5 to 1 wR. In the present invention,
The first layer is made by first spraying inorganic particles,
It can also be provided by spraying a liquid resin paint thereon.
この場合、液状樹脂塗料が無機質粒子の散布層に浸透し
て、多量の無機質粒子と樹脂塗料との混合層である第１
層が形成される。上述した通り、本発明によれば、金属
管内面に、ピンホール等の微細凹部があつても、その金
属管内面に表面平滑な塗装を施すことが可能である。In this case, the liquid resin paint penetrates into the dispersed layer of inorganic particles, and the first layer is a mixed layer of a large amount of inorganic particles and the resin paint.
A layer is formed. As described above, according to the present invention, even if the inner surface of the metal tube has minute recesses such as pinholes, it is possible to coat the inner surface of the metal tube with a smooth surface.
第１図並びに第２図は本発明を示すための説明図であり
、第１図は塗布直後の状態を第２図はピンホールの充填
状態をそれぞれ示している。FIGS. 1 and 2 are explanatory drawings to illustrate the present invention, with FIG. 1 showing the state immediately after coating and FIG. 2 showing the state of pinhole filling, respectively.
Claims (1)
した樹脂塗料の第１層を設け、無機質粒子を少量添加ま
たは無添加の樹脂塗料の第２層を上記第１層上に設け、
上記第１層中の無機質粒子を回転遠心力により樹脂を付
着させた状態で金属管内面の微細凹部に充填させること
を特徴とする金属管内面の塗装方法。1. A first layer of resin paint with a large amount of inorganic particles added is provided on the inner surface of the rotating metal tube, and a second layer of resin paint with a small amount or no addition of inorganic particles is provided on the first layer,
A method for coating the inner surface of a metal tube, characterized in that the inorganic particles in the first layer are filled into minute recesses on the inner surface of the metal tube in a state in which the resin is adhered by rotational centrifugal force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9111580A JPS6059028B2 (en) | 1980-07-02 | 1980-07-02 | How to paint the inner surface of metal tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9111580A JPS6059028B2 (en) | 1980-07-02 | 1980-07-02 | How to paint the inner surface of metal tubes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5715873A JPS5715873A (en) | 1982-01-27 |
| JPS6059028B2 true JPS6059028B2 (en) | 1985-12-23 |
Family
ID=14017511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9111580A Expired JPS6059028B2 (en) | 1980-07-02 | 1980-07-02 | How to paint the inner surface of metal tubes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6059028B2 (en) |
-
1980
- 1980-07-02 JP JP9111580A patent/JPS6059028B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5715873A (en) | 1982-01-27 |
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