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
• • 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
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
  • B05D7/16—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies using synthetic lacquers or varnishes
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
  • C09D5/08—Anti-corrosive paints
• • 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
  • B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
  • B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant

Definitions

• the present invention relates to an anticorrosive agent and a method for the application thereof according to the preamble of the following patent claims 1-7.
• Anticorrosive treatments of different kinds have today become more and more important, especially within the car manufacturing.
• One known type of anticorrosive treatment is based on covering the surfaces that are to be protec ⁇ ted against corrosion with agents that at elevated tempe ⁇ ratures are liquid. This property allows the agent to be applied in a rational way, preferably by being sprayed. Such agents are often based on wax.
• thermoplastic rubber which have rubber properties in temperatures somewhere under 100° and which have resin-like properties in temperatures somewhere above 100°.
• a thermoplastic rubber may consist of styrene-butadiene, styrene-isoprene or styrene.-ethylene/butylene-thermoplastics.
• the above-mentioned polymers can chemically be described as polymers consisting of block segments of styrene mono ⁇ mers and rubber monomers (butadiene or isoprene and ethy- lene/butylene) .
• the polymers may exist as a diblock, a triblock or in branched (radial) structure.
• polystyrene Before heating, the polystyrene is associated in rigid segments. Physical cross binding creates via polystyrene segments a threedimensional net.
• thermoplastics which are segmencopolymers of styrene and mixtures of olefines, for example ethene, propene and/or butene.
• Attemps have, as mentioned, been made with anticorrosive agents containing thermoplastic rubber. It has then been desirable to be able to use the application equipment on hand, which often is an arrangement where the agent is sprayed on, and to be able to apply the agents without using non-desirable compounds from an environmental point of view, such as solvents.
• thermo-rubber already has been subjec ⁇ ted to a non-desirable, phase, tranafor ance before it has reached the surface that is to be anticorrosion treated.
• the phase transformance means that one gets a thread-like cover of the thermoplastic rubber, a so called “co-webbing"
• the object of the present invention is to obtain an anti ⁇ corrosive agent and an application method which elimina ⁇ tes the disadvantages which are connected with the above- mentioned known agents and application methods.
• an anticorrosive agent which primarily relates to a composition intended to be applied on the surface by spraying of the hot liquid composition for obtaining a cover which is resistant to wear and corro ⁇ sion, the composition comprising a first glue-based bin ⁇ der, a second part of fillers and a third part consisting of a thero plastic polymer containing said thermoplastic rubber, and being characterized in that said second part of fillers contains compounds with a high heat capacity.
• Fig. 1 schematically shows an application arrangement according to the invention
• Fig. 2 schematically shows an arrangement for performing a modified method according to the invention
• Fig. 3 shows in more detail a chosen part of Fig. 2, and
• Fig. 4 shows an alternative modified method where the space is limited by the object that is to be cor ⁇ rosion-treated.
• Fig. 1 shows an object 1 with a surface 2 which is to be corrosion-treated.
• the schematically shown application arrangement comprises a container 3 which contains the liquid and the corrosive agent 4.
• the agent is kept li- quid by means of a suitable heat dissipating means 5 which, for example, by means of convection heat dissipa ⁇ ting means 6, releases a suitable (not shown controlling means) heat amount to the anticorrosive agent 4.
• a spraying nozzle 7 is shown which sprays a fog 8 of the agent towards the surface 2 that is to be protected.
• Bet ⁇ ween the nozzle 7 and the container 3 there is a connec ⁇ ting pipe 9. To this pipe 9 is in a suitable way a pres ⁇ sure increasing aggregate 10 connected.
• the solution according to the invention is based on the application of a filler with high heat capacity to the anticorrosive agent. Due to the use of such a filler, the undesirable generation of "co-webbing" is counteracted. The reason hereto is that fillers carry a sufficiently great heat amount so that the thermoplastic rubber, which is included in the anticorrosive agent, is not cooled down to the critical "co-webbing" limit until it reaches the object 1 to be protected.
• heat capacity is primarily meant the ability to store heat.
• weight of the agent is of minor importance, it is here primarily directed to the ability per volume unit, which means that an agent with a low specific heat and high density (for instance BaS0 4 ; 0,11 resp. 4,8) may as well be interesting as a compound with a high specific heat and lower density, (for example Al; 0,21 resp. 2,69).
• an agent with a low specific heat and high density for instance BaS0 4 ; 0,11 resp. 4,8
• a high specific heat and lower density for example Al; 0,21 resp. 2,69.
• the filler should have a "product" which exceeds 0,32, preferably exceeding 0,5 cal/cm 3 , °C, and that the filler, when being sprayed on, is not in the state of vapour but preferably in a solid state.
• the filler has the ability to relatively quickly release its heat to the surrounding mass during the air travel from the nozzle to the surface which is to be protected.
• the agent in some preferred cases also should have a relatively good heat contacting ability and/or a small grain size.
• a disadvantage with decreased grain size is, however, that the smallest pos ⁇ sible part of binder increases as the total exposed sur ⁇ face per volume unit is increased. Advantages and disad- vantages must, accordingly, be compared with each other for finding an optimum.
• the following table shows the grain size (in ⁇ m) of the fillers that have been used. Grain size of the different fillers
• the greatest grain size which is to be regarded as usable for application according to the invention, has turned out to be 150 ⁇ m.
• the recipe (2) that does not contain fillers according to the invention has bad spraying ability. It is evident that an addition of at least 20 % of thermoplastic rubber gives a very good wea ⁇ ring resistance.
• thermoplastic rubber articles can be mentioned which are sold under the trade mark Cariflex ® (Shell Chemical Company) the chemical composition of which is:
• FIG. 2 a modified method according to the invention is shown. With this method, the amount of fillers with which heat capacity can be drastically reduced by raising the surrounding temperature.
• Fig. 2 shows the limited space 11 in which an object 2 is located which is to be corro ⁇ sion-treated. Within the space 11 there is also, at least preferably, a mobile robot 21 (shown schematically) and equipped with a nozzle 14. Within the limited space 11 the application of an anticorrosive agent 15 is carried out at elevated temperature. Due to the fact that the application occurs at elevated temperature the unfavour ⁇ able forming of "co-webbing" is eliminated or avoided, which "co-webbing" arises at spraying of a thermoplastic rubber at normal temperature.
• suitable means are connected to the space 11.
• this means consists of a con- trol arrangement 18 that via a first pipe 19 supplies tempered air to the space 11 and a second pipe 20 con- ducting air out of the space.
• heating of the space also may be carri ⁇ ed out within said space in an other way, for example by means of radiators.
• Fig. 3 the object 2 and the nozzle 14 are shown as a partial view of Fig. 2.
• the figure shows that a robot 21 keeps and directs a nozzle 14 so that the fog 15 is ap ⁇ plied to the surface 13 that is to be corrosion-treated.
• the anticorrosive agent 15 containing thermoplastic rub ⁇ ber is supplied to the nozzle 14 in a conventional way, suitably by means of existing equipment 17. This means that the mass is supplied in a melted phase at a tempera ⁇ ture of about 150° C and at an approximate pressure of 100 bar, (which of course can vary within known limits for the man skilled in the art) . Without surplus efforts it is, consequently, possible, by means of the invention, to have one or more robots (or possible persons) to work simultaneously.
• one wall of the space consists of the object 2 that is to be corrosion- treated.
• the object 2 For cars it may for example be convenient to let the underside of the car be the roof of the limited space 1. It is released that more than one "wall" of the space may be made up of the object. In an extreme case it is thinkable to have all limiting surfaces made up by the object, that is a fully covering interior anticorrosion treatment.
• the invention is not limited to the above described, but can be varied within the scope of the following claims.
• the invention is not limited to the materials which are sold under the classification thermoplastic rubbers, but can of course be used for all kind of polymers that can be expected to have varying resistant influence on an anticorrosive agent and that has the property that they have an unfavourable change of the phases if the cooling at normal application is too large.
• Thermoplastic polyme ⁇ rs are therefore a more relevant denomination. It is also realized that the amount of the different parts can vary within relatively wide limits.
• the modified method is limited to the above described, but it is realized that, for example, the temperature in the space can be varied within wide limits and that, if the temperature is sufficiently high in the space, the filler with high heat capacity can be completely expelled.
• robots are preferably used for the spraying work. How many (for ex ⁇ ample 2, which are shown in Fig. 3) and what kind of ro ⁇ bots, that should be used, is a question of adaption which is within the order of the normal development work of the man skilled in the art, and preferably in cooperatin with people in the robot field.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Wood Science & Technology (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Paints Or Removers (AREA)
• Preventing Corrosion Or Incrustation Of Metals (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Compositions Of Macromolecular Compounds (AREA)

Applications Claiming Priority (4)

Publications (1)

Family

ID=26660552

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (2)

Family Cites Families (6)

• 1990
  • 1990-06-21 EP EP90910169A patent/EP0480967A1/de not_active Withdrawn
  • 1990-06-21 WO PCT/SE1990/000447 patent/WO1991000152A1/en not_active Ceased
  • 1990-06-21 JP JP2509481A patent/JPH04506368A/ja active Pending
  • 1990-06-21 AU AU59343/90A patent/AU5934390A/en not_active Abandoned

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events