WO2001024943A1 - Procede relatif a l'application d'un revetement a base de poudre de fluororesine thermodurcissable - Google Patents

Procede relatif a l'application d'un revetement a base de poudre de fluororesine thermodurcissable Download PDF

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Publication number
WO2001024943A1
WO2001024943A1 PCT/JP1999/005487 JP9905487W WO0124943A1 WO 2001024943 A1 WO2001024943 A1 WO 2001024943A1 JP 9905487 W JP9905487 W JP 9905487W WO 0124943 A1 WO0124943 A1 WO 0124943A1
Authority
WO
WIPO (PCT)
Prior art keywords
powder coating
coating
powder
particle size
paint
Prior art date
Application number
PCT/JP1999/005487
Other languages
English (en)
Japanese (ja)
Inventor
Keisuke Tano
Ryuji Iwakiri
Ryoichi Fukagawa
Daisuke Tanizawa
Nobuhiko Tsuda
Original Assignee
Daikin Industries, 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 Daikin Industries, Ltd. filed Critical Daikin Industries, Ltd.
Priority to AU60035/99A priority Critical patent/AU6003599A/en
Priority to PCT/JP1999/005487 priority patent/WO2001024943A1/fr
Publication of WO2001024943A1 publication Critical patent/WO2001024943A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
    • B05B14/48—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths specially adapted for particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • the present invention relates to a coating method for recovering and reusing thermosetting fluororesin powder coatings. Background technology
  • powder paints Compared with general solvent-type paints, powder paints have no emission of volatile solvents, are pollution-free, and are easy to manage. In recent years, it has been widely used in metal painting in general in recent years because of its many advantages.
  • the paint when painting by the charging method such as the corona method or the friction banding method, the paint is not applied as an overspray. Unused powder coatings are produced. Such unused powder coatings may be collected, blended with the Virgin powder coatings and reused for painting.
  • the recovery and reuse method for example, Japanese Patent Application Laid-Open No. 11-1696919
  • the recovery and reuse method used in the conventional powder coating of general-purpose resin is a thermosetting type.
  • fluororesin powder coatings When applied to fluororesin powder coatings, it has the unique properties of fluororesin, such as extremely high chargeability, high specific gravity, and volume-specific resistance. Due to its large properties (approximately 100 to 100 times that of general-purpose resins), the effects achieved with general-purpose resin powder coatings (such as the appearance of the coating film and the efficiency of coating) are low. Etc.) could not be obtained.
  • thermosetting fluororesin powder coating for electrostatic coating, which has an average particle diameter of 20 to 50 m and a particle size distribution of 1 to 4 m.
  • thermosetting fluororesin resin powder coating (A) were not applied as an overspray when electrostatically applied.
  • Thermosetting fluorine resin powder using recycled powder paint (C) blended with recovered powder paint (B) obtained by collecting powder paint Regarding how to apply paint.
  • the particle diameter contained in the virgin powder coating (A) is 7%.
  • the amount of particles above 5 x m is below 20% by weight.
  • the collected powder paint (B) is neutralized before blending with the version powder paint (A). It is preferred that the temperature of the paint (B) be maintained at a temperature of 35 or less until the paint is blended with the version powder paint (A).
  • the content of the nodine powder paint (A) in the reclaimed powder paint (C) obtained by blending is at least 35% by weight.
  • the average particle size of the regenerated powder coating (C) is 15 to 55 xm and the particle size distribution is 1 to 5.
  • thermosetting fluororesin resin powder having a mean particle size of 20 to 50 m and a particle size distribution of 1 to 4 (A) and the heat-curable fluororesin resin powder (A).
  • Curable fluororesin version Powder coating
  • Collected powder coating obtained by collecting powder coating that was not applied as an overspray when (A) was electrostatically coated
  • thermosetting fluorine resin powder paint wherein the content of the zonal powder paint (A) is 35% by weight or more.
  • the reclaimed powder paint (C) of the present invention the reclaimed powder paint (B) and the powdered version paint (A) are collected twice.
  • the coating efficiency of the raw powder coating (C) can be increased to 40% or more, and even to 50% or more. Best form for carrying out the invention
  • the coating method of the present invention is to adjust the average particle diameter and particle size distribution of the preliminary powder coating (A) in advance. As a result, the recovered powder coating (B) is simply blended with the specific version of the powder coating (A), and the regenerated powder coating (C) is merely blended. ) Can be used repeatedly.
  • the average particle diameter of the virgin powder coating material (A) is 20 to 50 im, preferably 30 to 40 m. If it is less than 20 zm, the fluidity of the powder coating material will be reduced, and the electrostatic repulsion will be too large, and the average particle of the regenerated powder coating material (C) will be too high. It works in the direction of decreasing the diameter, and the coating efficiency when applying the reclaimed powder coating (C) decreases. As described above, fluororesin has a high chargeability, and particularly remarkable electrostatic repulsion is caused by particles having a small particle size, so that the coating efficiency is improved. It is necessary to reduce the proportion of small-sized particles from the point of raising.
  • the appearance (smoothness, etc.) of the coating film obtained will be reduced, and the average particle size of the regenerated powder coating material (C) will be reduced. big It works in the opposite direction, and reduces the coating efficiency when applying the reclaimed powder coating (C).
  • the appearance of the coating film is remarkably reduced, so that the relatively large particle size (75 m or more) is used. ) Is preferably suppressed to 20% by weight or less.
  • the particle size distribution of the virgin powder coating (A) is expressed as a ratio of volume average particle diameter / number average particle diameter, and is 1 to 4, preferably 1 to 3, and more preferably. 1 to 2, particularly preferably 1 to 1.5. If the particle size distribution is too large, the coating efficiency of the reclaimed powder coating (C) will decrease, making it difficult to reuse and reuse it, and the appearance of the coating will also decrease. .
  • the recovered powder coating (B) in the present invention is defined as an overspray when the Nitrogen powder coating (A) or the reclaimed powder coating (C) is electrostatically applied.
  • Unused powder coating material that does not adhere to the object to be coated due to its use, such as laying, and is not used for painting, or its properties have changed during storage within a range that does not hinder reuse.
  • Unused powder paint can be collected in a usual manner, for example, in addition to a collection device consisting of a cyclone and a NOGFIEL®, as well as known collection devices. It should be done by
  • the powder coating (B) thus recovered is blended with the virgin powder coating (A) and becomes a recycled powder coating (C).
  • the blended virgin powder coating (A) is the same as the powder coating (A) described above.
  • the blend of the recovered powder coating (B) and the virgin powder coating (A) was 35% by weight of the nitrogen powder coating (A) in the regenerated powder coating (C). As described above, the content is preferably 70 to 98% by weight.
  • the blend amount of the recovered powder coating (B) is increased, the coating rate and It causes the deterioration of the coating film appearance.
  • the recovered powder paint (B) from the regenerated powder paint (C) is used, the content of the nitrogen powder paint (A) is increased at a high ratio. It is preferable to keep them constant or to increase them sequentially.
  • the content of the version powdered coating (A) should be 45% by weight or more. This is preferable because it increases the number of times of repeated use.
  • the recovered powder paint (B) Since the recovered powder paint (B) is charged by electrostatic coating, it is necessary to remove static electricity before blending with the version powder paint (A). Is preferred. There are two ways to remove static electricity: a method of giving the opposite charge and a method of leaving it undisturbed. However, the method is not limited to these.
  • the recovered powder coating (B) may require a certain period of time before it is blended. In this case, it is necessary to keep the recovered powder coating (B) below 35 until the blending is completed.
  • the blocking of the thermosetting fluororesin powder coating is required. It is desirable from the point of prevention.
  • These temperature control conditions are the same for the reclaimed powder coating (C) and the virgin powder coating.
  • the regenerated powder coating (C) prepared in this manner has an average particle size of 15 to 55 ⁇ m, preferably 20 to 50 xm, and a particle size distribution. Is 1 to 5, preferably 1 to 4.
  • the coating conditions for the regenerated powder coating (C) are the same as those used for conventional electrostatic coating.
  • thermosetting fluorine resin powder paint used in the present invention is basically a thermosetting fluorine resin powder and a curing agent, and if necessary, a pigment and various additives. It is an ordinary thermosetting fluorine resin powder coating.
  • Thermosetting fluororesin as a resin component There is no particular restriction as long as the polymer has an essential monomer component and a bridging reactive group as essential components.
  • fluorine-containing monomer examples include tetrafluoroethylen, black mouth trifluorene, trifluorene, and trifluorene.
  • vinylidene fluoride hexafluoropropylen
  • pentafluorene mouth propylene perfluorovinyl
  • One or more species, such as ethers and monofluoroethylen, are given. If necessary, it may be a non-fluorinated monomer-copolymerized product.
  • bridging reactive group examples include, for example, a hydroxyl group, a carboxyl group, an amino group, an amido group, an epoxy group, and an isocyanate.
  • halogen atoms such as bromine and iodine are exposed.
  • thermosetting fluororesin as a powder resin component
  • general-purpose thermosetting resin of non-fluorocarbon type for example, epoxy resin , Acrylic resin, polyester resin, etc. may be blended.
  • thermosetting powder coatings those which are conventionally used in thermosetting powder coatings can be used.
  • the blocking agent can be used.
  • Compounds, acid anhydrides, polyamin compounds, dalycidyl compounds, isocyanurate compounds, polybasic acids, and the like can be used.
  • pigments examples include condensed azo compounds, isoindolinone, quinacridone, diketopyrochloride, pyrrole, and intraquinone.
  • Organic pigments such as xanthane; titanium oxide, iron oxide, carbon black, carbon black, lead chromate, white lead, and molybdenum Inorganic oxide pigments such as orange; metal powders such as aluminum powder and stainless steel powder are produced.
  • various additives commonly used in powder coatings such as fillers, UV absorbers, leveling agents, and flow regulation Agents, antioxidants, thermal degradation inhibitors, glazing modifiers, charge control agents, etc., may be combined as appropriate.
  • thermosetting type fluororesin powder coating material whose properties can be maintained particularly favorably by the storage method of the present invention
  • thermosetting type fluororesin powder coating material for example, Japanese Patent Publication No. Relatively low glass described in the No. 2 publication, Japanese Patent Laid-Open No. 5-331338, the Japanese patent No. 28782726, etc. Powder coatings using thermosetting fluororesin with a transition temperature are required.
  • thermosetting fluororesin resin-based powder coating (Preparation of thermosetting fluororesin resin-based powder coating (A))
  • Black mouth Trifluorofluoroethylene Xylyl vinyl ether Z Isobutyl vinyl ether hydroxyl hydroxy vinyl ether (weight ratio: approx. 50 Z 16 Z 9/25)
  • Acid value 120 mg KOH / g, glass transfer temperature: 45, heat loss: less than 2% by weight, measured in tetrahydrofuran at 30
  • the determined solid viscosity [ ⁇ ]: 0.21) was pulverized with an impact hammer mill to produce a thermosetting fluorine resin powder.
  • the 26 parts by weight were uniformly mixed for about 1 minute with a dry blender (Henshierire 3 Mixer manufactured by Mitsui Chemicals, Ltd.).
  • Powder paint (A) was prepared.
  • the obtained version powder coating (A) is applied to the Nikkaki Co., Ltd. call using a multi-sided caller by a caller-counter method. According to the measurement, the average particle size was 35 m, the particle size distribution was 2.3, and the content of particles having a particle size of 75 m or more was 9 wt%. there were .
  • a 0.8 mm thick zinc phosphate treated steel sheet was electrostatically coated with a powdered vinyl powder (A) at an applied voltage of 40 kV.
  • the powder coating not used for coating was recovered and used as recovered powder coating (B1). Incidentally, the temperature of the recovered powder coating at the time of recovery was 28 ° C.
  • the painted steel plate was baked at 190 ° C for 20 minutes to produce a coated plate, and the appearance (Mitsuzawa) of the coating film was examined by the following method (reference). Example) The results are shown in Table 1.
  • the gloss values of the incident angles of 60 degrees and 30 degrees are measured by a gloss meter manufactured by Nippon Denshoku Co., Ltd.
  • the weight ratio of the recovered powder coating (B 1) and the virgin powder coating (A) is 80/20 (A) / (B 1) (Virgin powder coating (A) With a content of 80% by weight) and a dry powder for 5 minutes by a Henschel Mixer (manufactured by Aisha Seisakusho Co., Ltd.). Paint (C1) was prepared. This regenerated powder coating The average particle size of the material (CI) was 38 m, and the particle size distribution was 2.7.
  • the coated steel plate was baked at 190 t: for 20 minutes to prepare a coated plate, and the appearance (gloss) of the coating film was examined by the method described above. The results are shown in Table 1.
  • Example 3 before the blending, a treatment was performed to apply a positive charge to the recovered powder coating material (B) to remove electricity.
  • Example 6 the recovered powder coating (B) and the nitrogen powder coating (A) were blended and then classified with a 90 mesh wire mesh. was used as a reclaimed powder coating (C).
  • Example 7 in order to see the effect of the storage temperature of the recovered powder coating, the recovered powder coating was held for one hour in a 40 blast drying oven. ).
  • Example 1 When the regenerated powder coating (C) prepared in Example 1 was electrostatically applied, the unreacted regenerated powder coating was recovered as an overspray. Then, the recovered powder coating (B1) is mixed with the powdered vacuum coating (A) so that the content of the powdered coating is 80% by weight. Then, a reclaimed powder coating (C1) was prepared.
  • the reclaimed powder paint (C1) is electrostatically coated, and the unreacted reclaimed powder paint is collected as an overspray, and the recovered powder paint (B2) is collected. Then, this and the virgin powder paint (A) are blended so that the content of the virgin powder paint becomes 80% by weight, and the regenerated powder paint (C) is blended. 2) was prepared.
  • a steel plate on which the reclaimed powder coating (C 2) was electrostatically coated was baked at 19 Ot: for 20 minutes to prepare a coated plate, and the coating rate and the appearance (gloss) of the coating film were determined as described above. According to the above method, the coating rate was 51% by weight, the gloss at an incident angle of 60 ° was 79, and the gloss at an incident angle of 30 ° was 47.
  • Industrial applicability was 51% by weight, the gloss at an incident angle of 60 ° was 79, and the gloss at an incident angle of 30 ° was 47.
  • the virgin powder paint only one kind of powder paint is used as the virgin powder paint, and, in principle, special treatment or processing is performed on the recovered powder paint. Because they do not need to be applied, they can be easily blended and repainted at the painting site, and their practicability and economic effect are enormous.

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)

Abstract

L'invention concerne un procédé relatif à l'application d'un revêtement électrostatique à base de poudre de fluororésine thermodurcissable, qui consiste à utiliser un revêtement à base de poudre recyclé (C) obtenu par mélange entre un revêtement à base de poudre de fluororésine thermodurcissable frais (A) dont le diamètre de particule moyen est compris entre 20 et 50 νm, avec une distribution de taille de particule allant de 1 à 4, d'une part, et un revêtement à base de poudre récupéré (B) obtenu par récupération de revêtement n'ayant pas adhéré au moment de l'application électrostatique du revêtement frais (A) par surpulvérisation, d'autre part. Le procédé fait appel à un seul type de revêtement à base de poudre frais, utilisant généralement le revêtement à base de poudre récupéré sans traitement ni modification spécifique, moyennant quoi le mélange et la réapplication sont faciles, ce qui confère audit procédé des avantages importants sur le plan pratique et économique.
PCT/JP1999/005487 1999-10-05 1999-10-05 Procede relatif a l'application d'un revetement a base de poudre de fluororesine thermodurcissable WO2001024943A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU60035/99A AU6003599A (en) 1999-10-05 1999-10-05 Method for applying thermosetting fluororesin powder coating
PCT/JP1999/005487 WO2001024943A1 (fr) 1999-10-05 1999-10-05 Procede relatif a l'application d'un revetement a base de poudre de fluororesine thermodurcissable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1999/005487 WO2001024943A1 (fr) 1999-10-05 1999-10-05 Procede relatif a l'application d'un revetement a base de poudre de fluororesine thermodurcissable

Publications (1)

Publication Number Publication Date
WO2001024943A1 true WO2001024943A1 (fr) 2001-04-12

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Country Link
AU (1) AU6003599A (fr)
WO (1) WO2001024943A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003003123A (ja) * 2001-06-25 2003-01-08 Tomoegawa Paper Co Ltd 回収粉再生用の補充用粉体塗料及びそれを使用した回収粉再生方法
KR101980038B1 (ko) * 2018-03-21 2019-05-17 이선상 폐분체 도료의 재생방법
KR102068438B1 (ko) * 2019-05-09 2020-02-11 김태하 폐분체도료 재활용을 위한 선별방법

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5141033A (fr) * 1974-10-04 1976-04-06 Sharp Kk
JPH1176919A (ja) * 1997-09-02 1999-03-23 Dainippon Toryo Co Ltd 粉体塗料再利用方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5141033A (fr) * 1974-10-04 1976-04-06 Sharp Kk
JPH1176919A (ja) * 1997-09-02 1999-03-23 Dainippon Toryo Co Ltd 粉体塗料再利用方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003003123A (ja) * 2001-06-25 2003-01-08 Tomoegawa Paper Co Ltd 回収粉再生用の補充用粉体塗料及びそれを使用した回収粉再生方法
KR101980038B1 (ko) * 2018-03-21 2019-05-17 이선상 폐분체 도료의 재생방법
KR102068438B1 (ko) * 2019-05-09 2020-02-11 김태하 폐분체도료 재활용을 위한 선별방법

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Publication number Publication date
AU6003599A (en) 2001-05-10

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