JPH02235738A - Metallic product with corrosion resistant double film and manufacture thereof - Google Patents
Metallic product with corrosion resistant double film and manufacture thereofInfo
- Publication number
- JPH02235738A JPH02235738A JP5619189A JP5619189A JPH02235738A JP H02235738 A JPH02235738 A JP H02235738A JP 5619189 A JP5619189 A JP 5619189A JP 5619189 A JP5619189 A JP 5619189A JP H02235738 A JPH02235738 A JP H02235738A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- saturated polyester
- polyester resin
- resin
- 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.)
- Granted
Links
- 238000005260 corrosion Methods 0.000 title claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 230000007797 corrosion Effects 0.000 title abstract description 5
- 239000000843 powder Substances 0.000 claims abstract description 69
- 238000000576 coating method Methods 0.000 claims abstract description 48
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 45
- 229920001225 polyester resin Polymers 0.000 claims abstract description 44
- 239000004645 polyester resin Substances 0.000 claims abstract description 44
- 239000011248 coating agent Substances 0.000 claims abstract description 42
- 229920005989 resin Polymers 0.000 claims abstract description 35
- 239000011347 resin Substances 0.000 claims abstract description 35
- 238000002844 melting Methods 0.000 claims abstract description 28
- 230000008018 melting Effects 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000011812 mixed powder Substances 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims description 31
- 239000002184 metal Substances 0.000 claims description 31
- 239000002245 particle Substances 0.000 claims description 12
- 239000000758 substrate Substances 0.000 claims description 12
- 239000003973 paint Substances 0.000 claims description 8
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract description 10
- 239000011737 fluorine Substances 0.000 abstract description 10
- 229910052731 fluorine Inorganic materials 0.000 abstract description 10
- 239000000463 material Substances 0.000 description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- -1 ethylene glycol Chemical compound 0.000 description 8
- 229920000728 polyester Polymers 0.000 description 8
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 5
- 238000007598 dipping method Methods 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- MIZLGWKEZAPEFJ-UHFFFAOYSA-N 1,1,2-trifluoroethene Chemical group FC=C(F)F MIZLGWKEZAPEFJ-UHFFFAOYSA-N 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical compound C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 2
- 238000007610 electrostatic coating method Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical group FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 150000007519 polyprotic acids Polymers 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は合成樹脂粉体塗料の防食二重被膜を有する金属
製品および該金属製品の製造法に関する。詳しくは、飽
和ポリエステル樹脂粉体塗料と、該飽和ポリエステル樹
脂粉末と同じ材料および弗素樹脂粉末塗料との混合物か
ら成る粉末とを金属製品上に順次焼付けた二重構造被膜
を有する金属製品およびその製造法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a metal product having a double anticorrosive coating of a synthetic resin powder coating and a method for manufacturing the metal product. Specifically, metal products having a double-layered coating formed by sequentially baking a saturated polyester resin powder coating and a powder made of a mixture of the same material as the saturated polyester resin powder and a fluororesin powder coating on a metal product, and the production thereof. Regarding the law.
［従来の技術およびその問題点］
弗素系樹脂は一般に安定であり、耐熱、耐薬品性、耐溶
剤性、離型性等、優れた性能を有するため、金属の塗膜
用に有用である。しかしながら、コストが高いこと、作
業工程が難かしく、塗装に大変手間がかかる等の難点が
ある。しかも形成された該樹脂の塗膜の密着は他の樹脂
、例えばエボキシ樹脂等に比べてはるかに弱い。[Prior art and its problems] Fluorine-based resins are generally stable and have excellent properties such as heat resistance, chemical resistance, solvent resistance, and mold releasability, so they are useful for metal coatings. However, there are drawbacks such as high cost, difficult work processes, and a great deal of time and effort for painting. Moreover, the adhesion of the formed coating film of the resin is much weaker than that of other resins, such as epoxy resin.
従って本発明の主目的は、上記の弗素樹脂の難点を克服
すると同時に、弗素樹脂の優れた性能を何等損うことな
く、金属基材に良好に密着した防食被膜を形成すること
にある。Therefore, the main object of the present invention is to overcome the above-mentioned disadvantages of fluororesins and at the same time form an anticorrosion coating that adheres well to metal substrates without impairing the excellent performance of fluororesins.
ｒ問題点を解決するための手段〕
本発明によって、金属基材；該基材表面に融着された飽
和ポリエステル樹脂から本質的に成る下部被膜；および
該飽和ポリエステル樹脂と同一の樹脂および該樹脂より
も高融点の弗素樹脂粉末から本質的に成り、該飽和ポリ
エステル樹脂を介して該下部被膜と一体化された上部被
膜であって、その表面は実質的に均一に分散し且つ該飽
和ポリエステル樹脂により固定された該弗素樹脂粉末か
ら成る該上部被膜、を含む、防食二重被膜を有する金属
製品が提供される。Means for Solving Problems] According to the present invention, a metal substrate; a lower coating consisting essentially of a saturated polyester resin fused to the surface of the substrate; and a resin identical to the saturated polyester resin and the resin. an upper coating consisting essentially of a fluororesin powder having a melting point higher than that of the saturated polyester resin, the upper coating being integrated with the lower coating through the saturated polyester resin, the surface of which is substantially uniformly dispersed and comprising the saturated polyester resin; A metal product having a corrosion-protective double coating is provided, the upper coating comprising the fluororesin powder fixed by the above-described method.
上記の金属製品は、金属基材上に、飽和ポリエステル樹
脂粉末から本質的に成る塗料を焼付し（第１焼付工程）
、次いで該飽和ポリエステル樹脂と同一の樹脂の粉末お
よび該樹脂よりも高融点の弗素樹脂粉末の混合粉末から
本質的に成る塗料を該飽和ポリエステル樹脂の融点以上
且つ該弗素樹脂の融点未満の温度で焼付る（第２焼付工
程）ことを特徴とする方法によって製造することができ
る．
上記の第１および第２の焼付工程は、被塗装物である金
属基材を所定の温度に加熱し、加熱された該基材上に上
記二種の粉末塗料を順次焼付することによって、余熱を
利用して一気に実施することができる．第２の焼付工程
の後は、塗装された金属基材を冷水等に浸して急冷する
のが好ましい．
上記の二重被膜の上部被膜においては、弗素樹脂粉末は
溶融せずに粉末の形体にあり、該粉末は実質的に均一に
表面に分布して，実質的に弗素樹脂粉末から成る表面層
を形成している。また該粉末粒子は少なくとも一部分が
飽和ポリエステル樹脂に埋まって固定されている。The above metal products are manufactured by baking a paint consisting essentially of saturated polyester resin powder onto a metal base material (first baking step).
Then, a coating material consisting essentially of a mixed powder of a powder of the same resin as the saturated polyester resin and a fluororesin powder having a higher melting point than the resin is applied at a temperature above the melting point of the saturated polyester resin and below the melting point of the fluororesin. It can be manufactured by a method characterized by baking (second baking step). The above-mentioned first and second baking steps are performed by heating the metal base material to be coated to a predetermined temperature, and sequentially baking the above two types of powder coatings onto the heated base material. This can be done all at once using . After the second baking step, it is preferable to quench the coated metal substrate by immersing it in cold water or the like. In the upper coating of the double coating described above, the fluororesin powder is in the form of a powder without melting, and the powder is substantially uniformly distributed over the surface to form a surface layer consisting essentially of the fluororesin powder. is forming. Further, the powder particles are at least partially embedded and fixed in the saturated polyester resin.
本発明で使用する飽和ポリエステル樹脂粉末は、テレフ
タル酸、イソフタル酸又はこれらの混合物のような餡和
多塩基酸と、エチレングリコール等のグリコールとのエ
ステル結合により得られる樹脂であって、通常融点約２
４０゜〜３３０℃、好ましくは約２４０〜約２８０℃“
のものが有利に使用される。イソフタル酸成分約８〜約
２０モル％を含む、固有粘度約０．７〜約１．０の熱可
塑性ポリエチレンテレフタレートを用いた場合、特に優
れた金属基材との融着が得られる。該粉末の粒径は、通
常粉末塗料として用いられる範囲のものが使用できるが
下部被膜用として用いる場合は通常約８０〜約３５０メ
ッシェ（約１７５〜約４ｏμ）の粒径の粉末が用いられ
、弗素系樹脂粉末と混合して２回目の焼付に用いる場合
は比較的小粒径のもの、例えば約２０〜約３０μの粒径
の粉末を用いるのが好ましい。The saturated polyester resin powder used in the present invention is a resin obtained by ester bonding between a mixed polybasic acid such as terephthalic acid, isophthalic acid, or a mixture thereof and a glycol such as ethylene glycol, and usually has a melting point of about 2
40° to 330°C, preferably about 240 to about 280°C
are advantageously used. Particularly excellent fusion with metal substrates is obtained when thermoplastic polyethylene terephthalate containing about 8 to about 20 mole % of isophthalic acid component and having an intrinsic viscosity of about 0.7 to about 1.0 is used. The particle size of the powder can be in the range normally used for powder coatings, but when used for the lower coating, powder with a particle size of about 80 to about 350 meshes (about 175 to about 4oμ) is usually used, When mixed with fluorine-based resin powder and used for the second baking, it is preferable to use a powder with a relatively small particle size, for example, a particle size of about 20 to about 30 microns.
弗素樹脂粉末としては、通常四フッ化エチレンおよび三
フッ化エチレンの重合体又は共重合体、或は四フッ化エ
チレンおよび／または三フッ化エチレンを主成分とする
エチレン或はブロビレン若しくはビニルエーテルの共重
合体であって、使用する飽和ポリエステル樹脂よりも融
点が約３０℃以上高いもの、好ましくは融点約３００℃
以上のもの、更に好まし《は融点約３５０℃以上、特に
融点約４００℃前後のものが使用される。具体的には四
フッ化エチレン樹脂、四フッ化エチレン・六フツ化ブロ
ビレン樹脂、三フッ化ビニリデン樹脂、四フッ化バーフ
ロロアルキルビニルエーテル樹脂が例示される。The fluororesin powder is usually a polymer or copolymer of tetrafluoroethylene and trifluoroethylene, or a copolymer of ethylene, brobylene, or vinyl ether whose main component is tetrafluoroethylene and/or trifluoroethylene. A polymer having a melting point of about 30°C or more higher than the saturated polyester resin used, preferably about 300°C
Among the above compounds, those with a melting point of about 350°C or higher, particularly those with a melting point of about 400°C are used. Specific examples include tetrafluoroethylene resin, tetrafluoroethylene/hexafluoropropylene resin, vinylidene trifluoride resin, and tetrafluorobarfluoroalkyl vinyl ether resin.
該粉末の粒径は約２０μ以下、好ましくは約１５μ以下
、特に好まし《は約５〜約１０μである。The particle size of the powder is about 20 microns or less, preferably about 15 microns or less, particularly preferably about 5 to about 10 microns.
第２焼付工程で用いられる混合粉末塗料は、弗素樹脂を
該塗料全体の通常約５〜約５０重量％、好ましくは約ｌ
Ｏ〜約３０重量％、更に好ましくは約１５〜約２５重量
％含む。特に弗素樹脂を約２０重量％含む場合、優れた
防食金属製品が得られる．
第１および第２焼付工程に用いる各粉末塗料は、上記の
樹脂粉末の他の塗料に通常用いられる添加剤、例えば顔
料、を焼付け塗装を妨げない量で含んでもよい．
第１焼付工程は、使用した飽和ポリエステル樹脂の融点
以上、好まし《は該融点より約２０℃以上、更に好まし
くは約３０℃以上高い温度であって、該樹脂が劣化しな
い温度範囲で行われる．従って焼付温度は使用した飽和
ポリエステル樹脂の種類によって変化するが、通常は例
えば約２６０〜約３３０℃の範囲で行われる。焼付時間
は膜厚および焼付温度等に依存して変るが、数秒〜数十
秒、そして通常数秒、例えば約３〜約６秒程度である．
第２焼付工程は、使用した飽和ポリエステル樹脂の融点
以上、好ましくは該融点より約２０℃以上高い温度であ
って、使用した弗素樹脂の融点未満の温度で行われる。The mixed powder coating used in the second baking step usually contains a fluororesin in an amount of about 5 to about 50% by weight, preferably about 1 liter of the total weight of the coating.
O to about 30% by weight, more preferably about 15 to about 25% by weight. In particular, when it contains about 20% by weight of fluororesin, excellent corrosion-resistant metal products can be obtained. Each powder coating used in the first and second baking steps may contain additives commonly used in coatings other than the resin powder described above, such as pigments, in amounts that do not interfere with baking. The first baking step is carried out at a temperature higher than the melting point of the saturated polyester resin used, preferably about 20°C or more, more preferably about 30°C or more higher than the melting point, and within a temperature range where the resin does not deteriorate. ．． Therefore, the baking temperature varies depending on the type of saturated polyester resin used, but is usually in the range of about 260 DEG C. to about 330 DEG C., for example. The baking time varies depending on the film thickness, baking temperature, etc., but is several seconds to several tens of seconds, and usually several seconds, for example about 3 to about 6 seconds. The second baking step is carried out at a temperature not lower than the melting point of the saturated polyester resin used, preferably at least about 20° C. higher than the melting point, and lower than the melting point of the fluororesin used.
焼付時間は膜厚、焼付温度等に依存して変るが、防食被
膜に必要な膜厚を得るには通常数秒、例えば約１〜３秒
で十分である．
防食に必要な被膜の膜厚は、飽和ポリエステル樹脂から
成る下部被膜が約８０〜約６００μ、好ましくは約３０
０〜約４００μ、そして該ポリエステル樹脂と弗素樹脂
粉末とから成る上部被膜が約５０〜約２００μ、好まし
くは約８０〜約１５０μ、特に好ましくは約１００μ程
度である。The baking time varies depending on the film thickness, baking temperature, etc., but a few seconds, for example about 1 to 3 seconds, is usually sufficient to obtain the necessary film thickness for the anticorrosion coating. The thickness of the coating required for corrosion protection is about 80 to about 600μ, preferably about 30μ for the lower coating made of saturated polyester resin.
The thickness of the upper coating made of the polyester resin and fluororesin powder is about 50 to about 200 microns, preferably about 80 to about 150 microns, particularly preferably about 100 microns.
第１および第２の焼付工程は、流動槽浸漬法、静電塗装
法、スプレー法等によって行うことができるが、流動槽
浸漬法又は静電塗装法が好ましい。便利には金属基材を
所定の温度に加熱し、余熱を利用して第１焼付工程用塗
料および第２焼付工程用塗料の各槽に浸漬して順次焼付
けることができる。The first and second baking steps can be carried out by a fluidized bath dipping method, an electrostatic coating method, a spraying method, etc., but a fluidized bath dipping method or an electrostatic coating method is preferred. Conveniently, the metal base material can be heated to a predetermined temperature, and the remaining heat can be used to immerse it in each tank of the paint for the first baking step and the paint for the second baking step, so that the metal substrate can be baked in sequence.
本発明は全ての腐食性金属基材に適用できるが、例えば
鉄、鉄基材合金（ステンレス等）、アルミニウムおよび
その合金、銅およびその合金等から成る金属基材に適用
される．
〔作用および効果〕
金属基材に飽和ポリエステル樹脂粉末を焼付けた後、該
ポリエステル樹脂と同一の材料と該材料より高融点の弗
素系樹脂粉末との混合粉末を塗布しそして該ポリエステ
ル樹脂の融点以上且つ該弗素樹脂の融点未満の温度で焼
付ける（或いは該金属基材表面を上記温度に保持する）
と、該ポリエステル樹脂は溶融して前工程で塗布した飽
和ポリエステルと一体になる。一方、該弗素樹脂粉末は
溶融せずに微粉体の形体で保持されるため、見かけ比重
や形状の関係で溶融した飽和ポリエステル樹脂の表面に
均一に浮び上る。その後該基材を急冷すると、該ポリエ
ステル樹脂は固化し、多少収縮するので、表面に浮び上
がった弗素系樹脂粉末の粒子はその下部が少なくとも部
分的に（通常約半分近《》該ポリエステル被膜中に埋ま
って、強固に該被膜に取囲まれるので、剥離しない。従
って、弗素樹脂粉末は該ポリエステル被膜上に粉末の形
体で実質的に均−に分散し且つ該被膜に良く接着した表
面層を形成する。なお、上記混合粉末塗料中の弗素樹脂
粉末が多量（例えば約５０重量％近く）である場合には
上部被膜の内部に弗素樹脂粉末が残留するが、下部被膜
の金属基材に接する面までは到達しない．従って本発明
による二重構造被膜は金属基材に接する部分が飽和ポリ
エステルのみであるので、基材との密着性は完全である
．また表面が実質的に弗素樹脂から成るため，防食性、
離型性、耐薬品性、耐熱性等、弗素系樹脂固有の性質が
発現される。The present invention is applicable to all corrosive metal substrates, and is applied, for example, to metal substrates made of iron, iron-based alloys (stainless steel, etc.), aluminum and its alloys, copper and its alloys, etc. [Function and Effect] After baking saturated polyester resin powder onto a metal base material, a mixed powder of the same material as the polyester resin and a fluorine-based resin powder having a higher melting point than the material is applied, and the melting point of the polyester resin is higher than the melting point of the polyester resin. and baking at a temperature below the melting point of the fluororesin (or the surface of the metal base material is maintained at the above temperature)
Then, the polyester resin melts and becomes integrated with the saturated polyester applied in the previous step. On the other hand, since the fluororesin powder is not melted but held in the form of a fine powder, it floats uniformly on the surface of the molten saturated polyester resin due to its apparent specific gravity and shape. When the base material is then rapidly cooled, the polyester resin solidifies and shrinks to some extent, so that the fluorine-based resin powder particles floating to the surface are at least partially (usually about half) in the polyester coating. The fluororesin powder is embedded in the polyester film and is firmly surrounded by the film, so that it does not peel off.Therefore, the fluororesin powder is substantially uniformly dispersed in powder form on the polyester film and forms a surface layer that is well adhered to the film. Note that if the fluororesin powder in the mixed powder coating is large (for example, close to 50% by weight), the fluororesin powder will remain inside the upper coating, but it will not come into contact with the metal base material of the lower coating. Therefore, since the double-structure coating according to the present invention has only the saturated polyester in contact with the metal base material, the adhesion to the base material is perfect.Furthermore, the surface is substantially made of fluororesin. Therefore, corrosion resistance,
Characteristics unique to fluorine-based resins, such as mold releasability, chemical resistance, and heat resistance, are exhibited.
なお、本発明以外の方法で所期の目的を達成することは
困難である。゛たとえば、飽和ポリエステルと弗素樹脂
とを混合した粉体のみで被膜を作ると、浮び上らずに内
部に残留している弗素樹脂粉末が下部に定着して、金属
基材との密着性を妨げる．これは弗素樹脂の比率が多け
れば特に顕著である。また、前工程の樹脂と、弗素樹脂
と混合する樹脂が異なると、溶融樹脂同志が一体となら
ず、被膜が出来ても切りこみを入れると簡単に剥離する
。更にまた、飽和ポリエステルの代りに比重が弗素樹脂
と比してかなり小さい樹脂、例えば比重約１．０程度又
はそれ以下の樹脂（例えばポリエチレン）を用いると、
弗素樹脂粉末は表面に浮かび上らず、弗素樹脂粉末の表
面層が得られない。Note that it is difficult to achieve the intended purpose using methods other than the present invention.゛For example, if a film is made using only a powder mixture of saturated polyester and fluororesin, the fluororesin powder that remains inside without floating up will settle at the bottom, improving the adhesion to the metal substrate. hinder. This is particularly noticeable if the proportion of fluororesin is large. Furthermore, if the resin used in the previous step and the resin mixed with the fluororesin are different, the molten resins will not come together, and even if a film is formed, it will easily peel off when a cut is made. Furthermore, if a resin with a specific gravity considerably lower than that of a fluororesin is used instead of the saturated polyester, for example, a resin with a specific gravity of about 1.0 or less (for example, polyethylene),
The fluororesin powder does not float to the surface, and a surface layer of fluororesin powder cannot be obtained.
本発明によると、高価で且つ煩雑な工程を要する弗素系
樹脂の被膜形成を、飽和ポリエステルと併用することに
より安価に且つ簡単な方法で（例えば単に金属基材を加
熱し、２種の樹脂粉末浸漬槽内に順次浸漬する等）行う
ことができる。According to the present invention, the formation of a film using a fluorine-based resin, which requires an expensive and complicated process, can be performed at a low cost and in a simple manner by using it together with a saturated polyester (for example, by simply heating a metal base material, two types of resin powder can be formed). (e.g., sequential immersion in a dipping tank).
金属基材として１ ０ ０ｍｍＸ ５ ０ｍｍＸ２．３
ｍｍ （厚さ）の鉄片の試料を用い、これを表面温度
３３０℃に加熱する。100mm x 50mm x 2.3 as metal base material
A sample of an iron piece of mm (thickness) is used and heated to a surface temperature of 330°C.
流動浸漬槽を２ヶ用意し、一方には飽和ポリエステル樹
脂粉体にグレーの顔料（全体の１重量％）を混入した塗
料を、他方には同じ飽和ポリエステル樹脂粉末に全体で
２０重量％の弗素樹脂粉末を混合した塗料を入れる。こ
こで該飽和ポリエステル樹脂粉末として、イソフタル酸
成分１０モル％、固有粘度０．８のポリエチレンテレフ
タレート（融点２４５℃）で粒径８０〜３００メッシエ
の粉末を用いた。該弗素樹脂粉末として、四フッ化エチ
レンとパーフロロアルキルビニルエーテルの共重合体（
融点４００℃）で、粒径５〜１０μの粉末を用いた。Two fluidized immersion tanks were prepared, one containing a paint containing saturated polyester resin powder mixed with gray pigment (1% by weight of the total), and the other containing the same saturated polyester resin powder mixed with a total of 20% by weight of fluorine. Add paint mixed with resin powder. Here, as the saturated polyester resin powder, a powder of polyethylene terephthalate (melting point 245° C.) with an isophthalic acid component of 10 mol % and an intrinsic viscosity of 0.8 and a particle size of 80 to 300 Messier was used. As the fluororesin powder, a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether (
A powder with a melting point of 400° C.) and a particle size of 5 to 10 μm was used.
流動浸漬槽を可動し、中の粉末塗料を流動させる。先ず
、飽和ポリエステルのみの浸漬槽に鉄片試料（先に小穴
を設けた）を針で吊して浸漬する。この時の試料の表面
温度は約２８０℃であった。３秒間浸漬後、試料を取出
し、約３秒放置すると，表面まで粉末が完全に溶融する
ので、次に第２の槽、即ち弗素樹脂と飽和ポリエステル
樹脂の混合粉末塗料の流動槽内に約１秒浸漬して、取出
す。試料の余熱で飽和ポリエステル樹脂粉末は溶融しは
じめ、約６秒後にきれいに溶融して、前の工程の飽和ポ
リエステル樹脂と一体となる。弗素樹脂粉末は溶融せず
に表面に浮び上ってくる。Move the fluidized immersion tank to fluidize the powder paint inside. First, an iron piece sample (with a small hole made in the front) is suspended with a needle and immersed in a dipping tank containing only saturated polyester. The surface temperature of the sample at this time was about 280°C. After immersing the sample for 3 seconds, remove the sample and leave it for about 3 seconds until the powder completely melts to the surface. Dip for seconds and take out. The saturated polyester resin powder begins to melt due to the residual heat of the sample, and after about 6 seconds it completely melts and becomes integrated with the saturated polyester resin from the previous process. The fluororesin powder floats to the surface without melting.
そのまま試料を約２０秒放置した後、冷水に浸して急冷
する。冷水中に約５分浸した後、試料を取出して、被覆
工程は完了する。After leaving the sample as it is for about 20 seconds, immerse it in cold water to cool it rapidly. After approximately 5 minutes in cold water, the sample is removed and the coating process is completed.
形成された被膜を観察すると、表面は弗素樹脂特有の薄
い黄色で全表面が覆われているので、弗素樹脂粉末の粒
子が表面に一様に分散していることがわかる。手で触れ
ても非常に滑らかであり、飽和ポリエステル樹脂の被膜
とは異質であることが判る。なお、飽和ポリエステルか
ら成る下部被膜は約３００μ厚であり、そして弗素樹脂
粉末と飽和ポリエステル樹脂から成る上部被膜は約９０
μ厚であった。この二重構造の被膜は鉄片に良《融着し
ており、簡単には剥離しなかった。When the formed film is observed, the entire surface is covered with a pale yellow color unique to fluororesin, indicating that the particles of fluororesin powder are uniformly dispersed on the surface. It is very smooth to the touch, and it can be seen that it is different from a saturated polyester resin film. The lower coating made of saturated polyester has a thickness of about 300 μm, and the upper coating made of fluororesin powder and saturated polyester resin has a thickness of about 90 μm.
It was μ thick. This double-layered coating adhered well to the iron piece and did not peel off easily.
【咋だ〈砥μ 小沢匿之輔[It's Kui〈Toμ Kennosuke Ozawa
Claims (7)
テル樹脂から本質的に成る下部被膜；および該飽和ポリ
エステル樹脂と同一の樹脂および該樹脂よりも高融点の
弗素樹脂粉末から本質的に成り、該飽和ポリエステル樹
脂を介して該下部被膜と一体化された上部被膜であって
、その表面は実質的に均一に分散し且つ該飽和ポリエス
テル樹脂により固定された該弗素樹脂粉末から成る該上
部被膜、を含む、防食二重被膜を有する金属製品。(1) Metal substrate; a lower coating consisting essentially of a saturated polyester resin fused to the surface of the substrate; and a lower coating consisting essentially of a resin identical to the saturated polyester resin and a fluororesin powder having a higher melting point than the resin. an upper coating integrated with the lower coating via the saturated polyester resin, the surface of which is comprised of the fluororesin powder substantially uniformly dispersed and fixed by the saturated polyester resin; Metal products with anti-corrosion double coating, including an upper coating.
を含む、請求項１の金属製品。2. The metal product of claim 1, wherein said top coating comprises 5 to 50% by weight of fluororesin powder.
ある、請求項１又は２の金属製品。(3) The metal product according to claim 1 or 2, wherein the fluororesin powder has a particle size of 20 microns or less.
質的に成る塗料を焼付けし、次いで該飽和ポリエステル
樹脂粉末と同一の樹脂の粉末および該樹脂よりも高融点
の弗素樹脂粉末の混合粉末から本質的に成る塗料を該飽
和ポリエステル樹脂の融点以上且つ該弗素樹脂の融点未
満の温度で焼付ることを特徴とする、防食二重被膜を有
する金属製品の製造法。(4) Baking a paint consisting essentially of saturated polyester resin powder onto a metal substrate, and then using a mixed powder of a powder of the same resin as the saturated polyester resin powder and a fluororesin powder having a higher melting point than the resin. 1. A method for producing a metal product having a corrosion-protective double coating, which comprises baking a paint consisting essentially of a saturated polyester resin at a temperature higher than the melting point of the saturated polyester resin and lower than the melting point of the fluororesin.
用して順次に実施する、請求項４の方法。(5) The method according to claim 4, wherein the second baking step is performed sequentially using residual heat from the previous baking step.
を含む、請求項４の方法。(6) The method of claim 4, wherein the mixed powder contains 5 to 50% by weight of fluororesin powder.
ある、請求項４、５又は６の方法。(7) The method according to claim 4, 5 or 6, wherein the particle size of the fluororesin powder is 20 microns or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1056191A JP2756575B2 (en) | 1989-03-10 | 1989-03-10 | Metal product having double anticorrosion coating and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1056191A JP2756575B2 (en) | 1989-03-10 | 1989-03-10 | Metal product having double anticorrosion coating and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02235738A true JPH02235738A (en) | 1990-09-18 |
| JP2756575B2 JP2756575B2 (en) | 1998-05-25 |
Family
ID=13020216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1056191A Expired - Lifetime JP2756575B2 (en) | 1989-03-10 | 1989-03-10 | Metal product having double anticorrosion coating and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2756575B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010065509A (en) * | 2008-09-12 | 2010-03-25 | Tokyo Seiko Co Ltd | Outdoor installed metal post |
| JP2010065310A (en) * | 2008-09-12 | 2010-03-25 | Tokyo Seiko Co Ltd | Multilayer resin spraying method and metal structure with multilayer resin sprayed |
-
1989
- 1989-03-10 JP JP1056191A patent/JP2756575B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010065509A (en) * | 2008-09-12 | 2010-03-25 | Tokyo Seiko Co Ltd | Outdoor installed metal post |
| JP2010065310A (en) * | 2008-09-12 | 2010-03-25 | Tokyo Seiko Co Ltd | Multilayer resin spraying method and metal structure with multilayer resin sprayed |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2756575B2 (en) | 1998-05-25 |
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