EP0946307A1 - Procede pour pulveriser a l'air chaud des compositions polymeres en poudre fondant a la chaleur - Google Patents

Procede pour pulveriser a l'air chaud des compositions polymeres en poudre fondant a la chaleur

Info

Publication number
EP0946307A1
EP0946307A1 EP97937532A EP97937532A EP0946307A1 EP 0946307 A1 EP0946307 A1 EP 0946307A1 EP 97937532 A EP97937532 A EP 97937532A EP 97937532 A EP97937532 A EP 97937532A EP 0946307 A1 EP0946307 A1 EP 0946307A1
Authority
EP
European Patent Office
Prior art keywords
hot air
powdered
polymers
paint
combination
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.)
Ceased
Application number
EP97937532A
Other languages
German (de)
English (en)
Inventor
Silvestro Farronato
Sergio Gazzea
Faruq Marikar
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.)
Allnex Italy SRL
Original Assignee
Vianova Resins SpA
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 Vianova Resins SpA filed Critical Vianova Resins SpA
Publication of EP0946307A1 publication Critical patent/EP0946307A1/fr
Ceased legal-status Critical Current

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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
    • B05D3/0413—Heating with air
    • 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
    • B05D1/08—Flame spraying
    • B05D1/10—Applying particulate materials
    • 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
    • B05D1/12—Applying particulate materials

Definitions

  • Powder paints are up to now used almost exclusively in industrial plants as they need cumbersome static equipment such as baking ovens and application booths.
  • thermoplastic powder paints In order to remove these limitations flame guns were recently made available, allowing to apply thermoplastic powder paints in an open atmosphere through an annular flame which melts the projected powder paint.
  • the molten paint deposits on a support, but the presence of the flame limits its use only to thermoplastic paints of high molecular weight.
  • thermoplastic paints of high molecular weight In order to remove these limitations flame guns were recently made available, allowing to apply thermoplastic powder paints in an open atmosphere through an annular flame which melts the projected powder paint.
  • the molten paint deposits on a support, but the presence of the flame limits its use only to thermoplastic paints of high molecular weight.
  • to avoid combustion of the deposited molten paint it is necessary to move continuously and rapidly the point of projection of the flame.
  • heat guns comprising glue sticks pressed against a heated nozzle that melts them, allowing only their spreading.
  • hot air dryers are available on the market, that are used for packaging articles with shrinkable films.
  • a gun for projecting powder and a hot air dryer were designed in such a way that the outgoing hot air envelopped the gun no.zzle, thus the powder was deposited in a partially molten condition. Then temperature of the dryer was increased until the projected powder was deposited in a molten condition and thereafter discontinuing delivery of powder it was possible to crosslink it.
  • the method of the present invention consists of the use of at least one equipment comprising at least one gun for spraying the powdered paint or glue and at least one dryer for delivering hot air with variable temperature and output, possibly with a single nozzle so that the gun and dryer may be used contemporaneously or alternately according to the need.
  • the method allows the application of any meltable powdered composition or thermoplastic or thermosetting polymer on any kind of support or surface.
  • the powdered product to be applied may be projected in powder form from an adjustable close distance and can deposit on a surface in a molten or powdered condition.
  • the polymer can be melted and cross-linked by heat using the dryer part.
  • the dryer can first be used to preheat the surface on which the powdered polymer is applied with the gun and then is melted during or after said application.
  • the equipment As the equipment has a reduced size, it may be used as a single unit or a set of units, it may be movable or fixed, and it allows to paint either static or large surfaces, or small surfaces even for retouching purposes, by applying the paint melted at a temperature lower than the cross-linking.
  • paint thermally sensitive supports or to apply a powdered photohardenable paint, melting it and subjecting the applied film to UV radiation when it is still hot or after cooling.
  • thermosetting powder paints which are caused to melt and expand, controlling that they are perfectly spread and faultless, and subsequently they can be thermoset at any desired time and with any heat source such as hot air, flame, IR ovens, EB and so forth.
  • a hybrid polyester-epoxy powder paint comprising:
  • TiO 2 290 was sprayed in a molten condition on a steel sheet having a size of 6 xl5 cm coating it uniformly with a layer about 60 ⁇ thick, then stopping spraying and at the same time raising the air temperature to about 500°C, only hot air is projected for 2 minutes to obtain cross-linking.
  • the steel sheet is then subjected to analysis tests by comparing it with a sheet painted in the traditional way and hardened in an oven at 180°C for 20 minutes and it results in being equal to the standard sample.
  • hot air can be used to melt and harden a thermosetting powdered paint
  • the same paint was applied with the gun only on a sheet and then the dryer was used with a hot air output lowered to 500 foot/min, reducing the air inlet opening to avoid that the deposited paint is removed and with the temperature adjusted to 200°C the deposited paint melted and expanded. After fusion, the output was raised to 2,000 foot/min, the temperature to 400°C and this condition was held for 3 minutes. Also this steel sheet resulted in hardening like that hardened in an oven at 180°C for 20 minutes.
  • Example 2 Following the same procedure of Example 1 a polyester-polyurethane powder paint is deposited, consisting of:
  • UV Stabilizer 30 was sprayed in a molten condition on two steel sheets.
  • a transparent UN hardenable powder paint consisting of:
  • Degassing agent 3 was projected in a molten condition on two small wooden boards, coating them with a layer about lOO ⁇ thick, then one board was subjected with the still molten paint to UV radiation for 30 seconds, while the other board was cooled and after some days subjected with the applied cold paint to the same radiation but for one minute and surprisingly also the second board, when subjected to the acetone soaked cotten flock test, passed 100 back and forth rubs.
  • Thermoplastic powdered paint for traffic signs consisting of 600 parts of Mowilith
  • 35-73 (vinylacetate - maleate - Hoechst AG), 300 parts of Blanc fixe and 100 parts of titanium dioxide, was applied in a molten condition on asphalt using a special equipment provided with spraying gun and dryed with no.zzle positioned at 5-10 cm from the soil and mounted on a mobile carriage provided with compressor and power generator.
  • the output of hot air from the dryer is rased to 2200 foot/min and at a temperature of 700°C.
  • This p ⁇ tint was applied at a speed of 7-10 km/hour and five minutes after application and cooling it was subjected to tests of adhesion and abrasion resistance, largely passing the required specification, as it resulted perfectly adherent and wear resistant.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)

Abstract

Procédé permettant d'appliquer et/ou de faire fondre par la chaleur, avec éventuellement une thermofixation simultanée ou ultérieure, des polymères en poudre fondant à la chaleur. Selon le procédé, on utilise des générateurs d'air chaud et des convecteurs ayant une vitesse et une température variables (chalumeaux à air chaud pour revêtements ou colles en poudre à pulvériser).
EP97937532A 1996-08-08 1997-07-26 Procede pour pulveriser a l'air chaud des compositions polymeres en poudre fondant a la chaleur Ceased EP0946307A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI961728 1996-08-08
IT96MI001728A IT1283779B1 (it) 1996-08-08 1996-08-08 Metodo per l'applicazione ad aria calda di composizioni polimere in polvere termofusibili
PCT/EP1997/004161 WO1998006507A1 (fr) 1996-08-08 1997-07-26 Procede pour pulveriser a l'air chaud des compositions polymeres en poudre fondant a la chaleur

Publications (1)

Publication Number Publication Date
EP0946307A1 true EP0946307A1 (fr) 1999-10-06

Family

ID=11374792

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97937532A Ceased EP0946307A1 (fr) 1996-08-08 1997-07-26 Procede pour pulveriser a l'air chaud des compositions polymeres en poudre fondant a la chaleur

Country Status (6)

Country Link
EP (1) EP0946307A1 (fr)
AU (1) AU732517B2 (fr)
BR (1) BR9711177A (fr)
CA (1) CA2263003A1 (fr)
IT (1) IT1283779B1 (fr)
WO (1) WO1998006507A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE935837C (de) * 1951-12-16 1956-02-16 Max Dipl-Ing Deutrich Verfahren und Vorrichtung zum Warmspritzen von Anstrichmassen
US3076214A (en) * 1961-01-31 1963-02-05 United Shoe Machinery Corp Methods of bonding
US3958758A (en) * 1975-05-27 1976-05-25 Owens-Illinois, Inc. Spraying apparatus
US4065057A (en) * 1976-07-01 1977-12-27 Durmann George J Apparatus for spraying heat responsive materials
FI823821L (fi) * 1981-11-14 1983-05-15 Antler Ltd Foerfarande foer tillverkning av delar av termoplastiskt material
US5338578A (en) * 1993-01-21 1994-08-16 Gencorp Inc. Method for achieving a smooth powder coated finish on a low density compression-molded plastic article
US5503872A (en) * 1994-03-14 1996-04-02 Mackenzie; Kenneth R. Flameless plastic coating apparatus and method therefor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9806507A1 *

Also Published As

Publication number Publication date
IT1283779B1 (it) 1998-04-30
CA2263003A1 (fr) 1998-02-19
BR9711177A (pt) 2000-01-11
AU4012797A (en) 1998-03-06
ITMI961728A0 (fr) 1996-08-08
AU732517B2 (en) 2001-04-26
ITMI961728A1 (it) 1998-02-08
WO1998006507A1 (fr) 1998-02-19

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