JPS6365023B2 - - Google Patents

Info

Publication number
JPS6365023B2
JPS6365023B2 JP11135981A JP11135981A JPS6365023B2 JP S6365023 B2 JPS6365023 B2 JP S6365023B2 JP 11135981 A JP11135981 A JP 11135981A JP 11135981 A JP11135981 A JP 11135981A JP S6365023 B2 JPS6365023 B2 JP S6365023B2
Authority
JP
Japan
Prior art keywords
aggregate
layer
polyethylene
epoxy resin
paint
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
Application number
JP11135981A
Other languages
Japanese (ja)
Other versions
JPS5812753A (en
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 filed Critical
Priority to JP11135981A priority Critical patent/JPS5812753A/en
Publication of JPS5812753A publication Critical patent/JPS5812753A/en
Publication of JPS6365023B2 publication Critical patent/JPS6365023B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Laminated Bodies (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Description

【発明の詳細な説明】[Detailed description of the invention]

本発明は鋳鉄管等の内外面の防食に使用する防
食層の改良に関するものである。 鋳鉄管の防食には、各種の樹脂が用いられてい
るが、ポリエチレンは不活性であること、価値的
に比較的低廉であること等のために特に、有益で
ある。しかしながら、金属等に対する密着性が劣
悪であるため、ポリエチレンのまゝでは使用でき
ず、密着性の改良のために変成した変形ポリエチ
レンの形態で使用されている。 この変成ポリエチレンには各種のものが存在す
るが、塗料価格が高く、また、長期の浸漬、屋外
曝露、塩水噴霧等の試験に対しては満足な結果が
得られず、厳しい腐食環境のもとでの防食には適
用し難い。 もつとも、エポキシ樹脂層、変成ポリエチレン
層並びにポリエチレン層からなる三層構造の防食
層においては、金属素地とエポキシ樹脂層との秀
れた密着性、変成ポリエチレン層とエポキシ樹脂
層並びにポリエチレン層との良好な密着性、表面
層であるポリエチレンの不活性のために、長期の
浸漬、屋外曝露、塩水噴霧等の試験に対し、秀れ
た性能を有する。しかしながら、三層構成であ
り、ランニングコストが高価であるといつた不利
がある。 本発明者等は、上記した諸性能を充足し、かつ
低コストな防食層を得るべく、ポリエチレンを主
として使用した防食層について種々実験を行つた
ところ、エポキシ樹脂層を下層として使用し、上
層としてポリエチレン/骨材との重量比が1/0.1
〜1/3の骨材混入ポリエチレンを使用することが
有効であることを知見して、本発明に到達するに
至つた。 本発明に係る防食層は、長期の浸漬、屋外曝
露、塩水噴霧等の何れの試験に対しても秀れた性
能を呈し、その理由としては、下層のエポキシ樹
脂自体の金属素地への密着性が秀れ、下層のエポ
キシ樹脂層と上層の骨材混入ポリエチレン層との
界面がせん断に対して骨材で結合され、表面層で
ある骨材混入ポリエチレン層のポリエチレンが化
学的に安定であること等が考えられる。 本発明において、骨材には通常、珪砂を使用す
る。骨材の混入割合をポリエチレン1に対し、
0.1〜3に限定する理由は、0.1以下では後述する
ように、例えば塩水噴霧試験に対して満足な結果
が得られず、3以上では防食層の表面平滑性が低
下し、外観低下が顕著となるためである。好まし
い範囲は1/0.3〜1/1である。 本発明において使用する骨材の粒度は、全体の
25〜50%が50〜200メツシユの範囲内であるよう
に選択することが望ましく、かゝる粒度範囲内で
あれば、ポリエチレンに粉末ポリエチレンを使用
する場合、これと骨材とのドライブレンドも容易
である。 本発明において、必要に応じ下層を構成するエ
ポキシ樹脂にも骨材を混入でき、その混入量は重
量比で、エポキシ樹脂1に対し、0.1〜0.3とする
ことが望ましく、また、粒度は上層に混入するも
のよりも粗くすることが望ましい。 本発明は、例えば、次のような態様で実施する
ことができる。 すなわち、鋳鉄管を予熱し(300〜500℃)、所
定の温度(180〜280℃)になるまで冷却し、骨材
混入粉体エポキシ塗料を塗布し、次に骨材混入粉
体ポリエチレン塗料を塗布し、而るのち、除冷す
る方法、または上記骨材混入粉体エポキシ塗料の
代りに骨材混入液状エポキシ塗料を用いる方法を
使用できる。後者の場合、液状エポキシには、速
乾タイプまたは無溶剤タイプのものが用いられ
る。更に、骨材無添加の液状エポキシ塗料を塗布
し、これが乾燥するまえに、その表面に骨材を散
布し、次いで、骨材混入粉体ポリエチレン塗料を
塗布する方法を用いることもできる。 以下、本発明に係る防食層の各種性能試験につ
いて説明する。 1 90゜ピール強度 鋳鉄管を350℃に余熱し、280℃まで冷却した
のち、骨材混入粉体エポキシ樹脂塗料(エポキ
シ1:骨材:0.1)を塗布し、更に、第1表の
上層塗料を塗布し、次いで、除冷したもののそ
れぞれにつき初期密着力並びに長期密着力を測
定したところ第1表の通りであつた。 この場合、骨材混入ポリエチレンには、粉体
ポリエチレン1:骨材1のものを使用し、長期
密着力は、試験片を水中に1年浸漬した後に測
定した。
The present invention relates to improvements in anti-corrosion layers used to prevent corrosion on the inner and outer surfaces of cast iron pipes and the like. Although various resins are used to protect cast iron pipes from corrosion, polyethylene is particularly useful because it is inert and relatively inexpensive. However, due to its poor adhesion to metals, polyethylene cannot be used as is, and is instead used in the form of modified polyethylene, which has been modified to improve adhesion. There are various types of modified polyethylene, but the cost of paint is high, and satisfactory results cannot be obtained in tests such as long-term immersion, outdoor exposure, and salt spray, and they cannot be used in harsh corrosive environments. It is difficult to apply this method to corrosion protection. However, in a three-layer corrosion protection layer consisting of an epoxy resin layer, a modified polyethylene layer, and a polyethylene layer, excellent adhesion between the metal base and the epoxy resin layer, and good bonding between the modified polyethylene layer, the epoxy resin layer, and the polyethylene layer are required. Due to its excellent adhesion and the inertness of the polyethylene surface layer, it has excellent performance in tests such as long-term immersion, outdoor exposure, and salt spray. However, it has a three-layer structure and has disadvantages such as high running costs. In order to obtain a corrosion protection layer that satisfies the above-mentioned performance and is low cost, the present inventors conducted various experiments on a corrosion protection layer mainly using polyethylene, and found that an epoxy resin layer was used as a lower layer and an upper layer Weight ratio of polyethylene/aggregate is 1/0.1
We have arrived at the present invention by finding that it is effective to use polyethylene mixed with ~1/3 aggregate. The anticorrosion layer according to the present invention exhibits excellent performance in all tests such as long-term immersion, outdoor exposure, and salt spray, and the reason for this is the adhesion of the underlying epoxy resin itself to the metal substrate. The interface between the lower epoxy resin layer and the upper aggregate-containing polyethylene layer is bonded by the aggregate against shearing, and the polyethylene in the aggregate-containing polyethylene layer, which is the surface layer, is chemically stable. etc. are possible. In the present invention, silica sand is usually used as the aggregate. The mixing ratio of aggregate to 1 part of polyethylene,
The reason for limiting the value to 0.1 to 3 is that if it is less than 0.1, satisfactory results cannot be obtained in the salt spray test, for example, and if it is more than 3, the surface smoothness of the anticorrosion layer will decrease, and the appearance will be significantly deteriorated. To become. The preferred range is 1/0.3 to 1/1. The particle size of the aggregate used in the present invention is
It is preferable to select 25 to 50% of the particles within the range of 50 to 200 mesh, and if powdered polyethylene is used for polyethylene, dry blending of this with aggregate is also possible within such a particle size range. It's easy. In the present invention, if necessary, aggregate can be mixed into the epoxy resin constituting the lower layer, and the amount of aggregate mixed in is preferably 0.1 to 0.3 to 1 part of the epoxy resin in terms of weight ratio, and the particle size can be adjusted to the upper layer. It is desirable to make it coarser than what is mixed in. The present invention can be implemented, for example, in the following manner. That is, a cast iron pipe is preheated (300-500℃), cooled to a predetermined temperature (180-280℃), and then powdered epoxy paint mixed with aggregate is applied, and then powdered polyethylene paint mixed with aggregate is applied. It is possible to use a method in which the coating is applied and then slowly cooled, or a method in which an aggregate-containing liquid epoxy paint is used instead of the aggregate-containing powder epoxy paint. In the latter case, the liquid epoxy used is a quick-drying type or a solvent-free type. Furthermore, it is also possible to use a method in which a liquid epoxy paint containing no aggregate is applied, aggregate is sprinkled on the surface of the paint before it dries, and then a powder polyethylene paint containing aggregate is applied. Below, various performance tests of the anticorrosion layer according to the present invention will be explained. 1 90° Peel Strength After preheating the cast iron pipe to 350°C and cooling it to 280°C, apply aggregate-mixed powder epoxy resin paint (epoxy 1: aggregate: 0.1), and then apply the upper layer paint shown in Table 1. The initial adhesion force and long-term adhesion force of each of the coated and slowly cooled samples were measured and were as shown in Table 1. In this case, the aggregate-containing polyethylene used was powder polyethylene 1: aggregate 1, and the long-term adhesion was measured after the test piece was immersed in water for one year.

【表】 第1表から、本発明に係る防食層において
は、長期密着性に著しく秀れていることが明ら
かである。 2 塩水噴霧試験 上記比較例並びに実施例につき、JISZ2371
に準じて塩水噴霧試験を行い、防食層の剥離が
生じるまでの期間を測定したところ、第2表の
通りであつた。
[Table] From Table 1, it is clear that the anticorrosion layer according to the present invention has excellent long-term adhesion. 2 Salt spray test For the above comparative examples and examples, JISZ2371
A salt spray test was carried out according to the method, and the period until the anticorrosion layer peeled off was measured, and the results were as shown in Table 2.

【表】 第2表から本発明に係る防食層においては、
塩水噴霧試験に著しく秀れていることが明らか
である。 更に、上記実施例において、ポリエチレン:
骨材の重量割合を変えて塩水噴霧試験を行つた
ところ、第3表の通りであり、重量比が1:01
〜1:3のもとで塩水噴霧試験の結果が向上す
ることが第3表と第2表の比較例1との対比か
ら明らかである。
[Table] From Table 2, in the anticorrosion layer according to the present invention,
It is clear that it excels in the salt spray test. Furthermore, in the above examples, polyethylene:
When we conducted a salt spray test with different weight ratios of aggregate, the results are shown in Table 3, and the weight ratio was 1:01.
It is clear from the comparison between Table 3 and Comparative Example 1 in Table 2 that the results of the salt spray test are improved under the ratio of ~1:3.

【表】【table】

Claims (1)

【特許請求の範囲】[Claims] 1 エポキシ樹脂の下層上に、ポリエチレン/骨
材との重量比が1/0.1〜1/3の骨材混入ポリエチレ
ンの上層を設け、下層と上層との界面に骨材を介
在させたことを特徴とする防食層。
1. An upper layer of aggregate-mixed polyethylene with a polyethylene/aggregate weight ratio of 1/0.1 to 1/3 is provided on the lower layer of epoxy resin, and the aggregate is interposed at the interface between the lower layer and the upper layer. Anti-corrosion layer.
JP11135981A 1981-07-15 1981-07-15 Corrosion protective layer Granted JPS5812753A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11135981A JPS5812753A (en) 1981-07-15 1981-07-15 Corrosion protective layer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11135981A JPS5812753A (en) 1981-07-15 1981-07-15 Corrosion protective layer

Publications (2)

Publication Number Publication Date
JPS5812753A JPS5812753A (en) 1983-01-24
JPS6365023B2 true JPS6365023B2 (en) 1988-12-14

Family

ID=14559193

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11135981A Granted JPS5812753A (en) 1981-07-15 1981-07-15 Corrosion protective layer

Country Status (1)

Country Link
JP (1) JPS5812753A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6378934U (en) * 1986-11-12 1988-05-25
JPH0668595B2 (en) * 1986-11-13 1994-08-31 キヤノン株式会社 Method for manufacturing exposure control blades
WO1995013250A1 (en) * 1993-11-10 1995-05-18 Ebara Shoji Kabushiki Kaisha Resin concrete product and method of manufacturing same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6378934U (en) * 1986-11-12 1988-05-25
JPH0668595B2 (en) * 1986-11-13 1994-08-31 キヤノン株式会社 Method for manufacturing exposure control blades
WO1995013250A1 (en) * 1993-11-10 1995-05-18 Ebara Shoji Kabushiki Kaisha Resin concrete product and method of manufacturing same

Also Published As

Publication number Publication date
JPS5812753A (en) 1983-01-24

Similar Documents

Publication Publication Date Title
CA1262624A (en) Black corrosion resistant coating and method for a metal substrate
US4407893A (en) Polyolefin coating containing an ionomer for metal substrates
EP0808883A3 (en) Water-reducible coating composition for providing corrosion protection
HUP0100715A1 (en) Dispersed resins for use in coating compositions
US3887449A (en) Coating method and composition for the sacrificial protection of metal substrates
JPS6365023B2 (en)
CN112143268B (en) Preparation of phosphate bonded polytetrafluoroethylene coating and coating
JPS63119880A (en) Method for coating rusty surface and coated object
JPS59221361A (en) Heat-resistant corrosion-proofing paint
JPS60141549A (en) Corrosion-resistant coated laminate
JPH10113613A (en) Anticorrosive paint coating method
JPH06104220B2 (en) Method for forming heat fusible fluorine resin layer on metal surface
JPS61101565A (en) Inorganic paint
JPH01236283A (en) Double-layered rust-preventive coating film
JPS6241629B2 (en)
JPS60138078A (en) Pretreating agent for painting of metal
TH546A (en) Silicate coating method provides a substrate that has already been coated.
JPS61152444A (en) Coated steel plate having excellent weldability, workabilityand corrosion resistance
TH456B (en) Silicate coating method provides a substrate that has been coated.
JPS6232232B2 (en)
JPS62902Y2 (en)
TH546EX (en) Silicate coating method provides a substrate that has already been coated.
JPH02272070A (en) Water-based rusting-proof coating for iron wires reinforcing concrete foam
JPS6017462B2 (en) Zn alloy anti-rust pigment powder for highly corrosion-resistant anti-rust paints
JP2013166806A (en) Coating material