GB2105218A - Process for applying reaction-hardening two-component or multicomponent coating materials to underwater surfaces - Google Patents

Process for applying reaction-hardening two-component or multicomponent coating materials to underwater surfaces Download PDF

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Publication number
GB2105218A
GB2105218A GB08219824A GB8219824A GB2105218A GB 2105218 A GB2105218 A GB 2105218A GB 08219824 A GB08219824 A GB 08219824A GB 8219824 A GB8219824 A GB 8219824A GB 2105218 A GB2105218 A GB 2105218A
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GB
United Kingdom
Prior art keywords
coating
airless
hardening
water
coating material
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.)
Withdrawn
Application number
GB08219824A
Inventor
Peter Heinze
Hans-Joachim Dittmers
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.)
DITTMERS LUDWIG GmbH
Original Assignee
DITTMERS LUDWIG GmbH
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 DITTMERS LUDWIG GmbH filed Critical DITTMERS LUDWIG GmbH
Publication of GB2105218A publication Critical patent/GB2105218A/en
Withdrawn legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins

Abstract

A process is disclosed for applying reaction-hardening two-component or multicomponent coating materials to underwater surfaces, wherein a coating material with a high wetting power is applied in finely dispersed manner by low pressure or airless spraying, or centrifuging. The coating material used may be a solvent-free, low viscosity, sprayable epoxy resin-hardener mixture containing active corrosion inhibiting pigments and/or inert fillers. The high wetting power of the coating material gives firm adhesion thereof to the underwater surface to be coated.

Description

SPECIFICATION Process for applying reaction-hardening twocomponent or multicomponent coating materials to underwater surfaces The invention relates to a process for applying reaction-hardening two-component or multicomponent coating materials, such as paints, corrosion inhibitors, etc to underwater surfaces.
It is ofvital inportance to provide an effective corrosion protection for underwater objects which are exposed to the atmosphere (oxygen) every so often.
Such corrosion protection measures relate more particularly to offshore constructions e.g. drilling and exploration platforms, lighthouses, fioodgates, dock and port installations, bulkheads, as well as ships.
In the case of objects which are to some extent movable such as ships, pontoons, sluice gates, etc it is possible to carry out the corrosion protection measures in the dry, e.g. in the dock, it then being possible to use conventional corrosion protection materials and application processes.
However, it is more difficult to apply coating materials under water, where it is standard practice for a diver to apply such materials with a brush or roller.
Suitable coating materials are reaction-hardening two-component or multicomponent systems satisfying the following requirements. They must be heavier than water, solvent-free and miscible with or dispersible in water. The main disadvantages of such an application is that, in view of the fact that it can only be performed manually, it is extremely costly and is also subject to quality variations. Therefore underwater corrosion protection is generally limited to repairs.
The problem of the invention is to provide a process of the aforementioned type enabling uniform coatings to be economically applied to large underwater surfaces.
According to the invention this problem is solved in that a coating material with a high wetting power is applied in finely dispersed manner by low pressure or airless spraying, centrifuging, etc. Due to the high wetting power of the coating material, necessary for obtaining a rapid, firm adhesion thereof to the substrate to be coated, such spraying or centrifuging can be carried out rapidly and with excellent uniformity of the coating thickness beiow the surface of the water using the requisite mechanical equipment such as spraying units, spray guns, centrifuging equipment, etc. Mechanical application also ensures better adhesion to the substrate, which can be concrete, steel, wood or other conventional materials.In addition to being highly economic as a result of the higher coating capacity compared with manual application, the process of the invention inter alia also permits the corrosion protection coating of nonuniform surfaces and surfaces which are inaccessible when using a brush or roller such as undercuts, gaps, cracks, etc, i.e. those parts which can be in contact with water and air.
It is particularly advantageous to use a solvent4ree, low viscosity, sprayable epoxy resin-hardener mixture containing corrosion inhibiting pigments and/or inertfillers. This material particularly effectively satisfies the aforementioned basic requirements such as specific gravity, immiscibility with water, reaction hardenability and freedom from solvents. By adding suitable agents, the material can also be given the necessary low surface tension, i.e. a high wetting power.
When the coating material is applied by the airless process it can be advantageous to build up a pneumatic cushion round the coating material fans formed, which eliminates the resistance of the surrounding water and increases the impact speed of the individual coating particles, ensuring better adhesiveness.
The invention is described in greater detail hereinafter relative to examples.
Example A : application by air atomization A material consisting of 40% epoxy resin based on bisphenol A with an epoxy equivalent weight of approximately 200,30% specifically heavy fillers such as zinc and/or barium sulphate, additions of titanium compounds as wetting agents, is hardened with a cycloaliphatic amine having a hydrogen equivalent weight of approximately 150.
The material is sprayed by means of a pot-type spray gun having a 3 mm nozzle onto a Sa 3-blasted steel test plate with a peak-to-valley height of 65,cm, using an air pressure of 6 bar, a spraying distance of 3 to 5 cm and at a water depth of 1 m. The coating thickness obtained is approximately 300 iim, it hardens uniformly and forms a closed, flat, uniform coating.
Example B : application by airless process A material consisting of 20% epoxy resin based on bisphenol A with an epoxy equivalent weight of approximately 190,25% tar oil with a viscosity of 2000 to 3000 mPas, 30% inert fillers and a small amount of titanium compounds as the wetting agent is hardened with a hardener mixture of aromatic amines and aliphatic amine adducts. The material is sprayed onto Sa 3-blasted metal sheets with a peak-to-valley height of approximately 65 clam using a 1: 60 airless pump and a 0.66 mm nozzle with a spraying distance of approximately 5 cm and at a water depth of 50 cm.
The coating thickness is on average 100 elm and has the characteristics described in example A.
Example C: application by combined airless and air process Same conditions and requirements as in example B, except that air jets are positioned on either side of the airless material nozzle, so that on spraying the material there is also a 6 bar air pressure.
1. A process for applying reaction-hardening two-component or multicomponent coating materialps to underwater surfaces, wherein a coating material with a high wetting power is applied in finely dispersed manner by low pressure or airless spraying, centrifuging, etc.
2. A process according to claim 1, wherein the
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Process for applying reaction-hardening twocomponent or multicomponent coating materials to underwater surfaces The invention relates to a process for applying reaction-hardening two-component or multicomponent coating materials, such as paints, corrosion inhibitors, etc to underwater surfaces. It is ofvital inportance to provide an effective corrosion protection for underwater objects which are exposed to the atmosphere (oxygen) every so often. Such corrosion protection measures relate more particularly to offshore constructions e.g. drilling and exploration platforms, lighthouses, fioodgates, dock and port installations, bulkheads, as well as ships. In the case of objects which are to some extent movable such as ships, pontoons, sluice gates, etc it is possible to carry out the corrosion protection measures in the dry, e.g. in the dock, it then being possible to use conventional corrosion protection materials and application processes. However, it is more difficult to apply coating materials under water, where it is standard practice for a diver to apply such materials with a brush or roller. Suitable coating materials are reaction-hardening two-component or multicomponent systems satisfying the following requirements. They must be heavier than water, solvent-free and miscible with or dispersible in water. The main disadvantages of such an application is that, in view of the fact that it can only be performed manually, it is extremely costly and is also subject to quality variations. Therefore underwater corrosion protection is generally limited to repairs. The problem of the invention is to provide a process of the aforementioned type enabling uniform coatings to be economically applied to large underwater surfaces. According to the invention this problem is solved in that a coating material with a high wetting power is applied in finely dispersed manner by low pressure or airless spraying, centrifuging, etc. Due to the high wetting power of the coating material, necessary for obtaining a rapid, firm adhesion thereof to the substrate to be coated, such spraying or centrifuging can be carried out rapidly and with excellent uniformity of the coating thickness beiow the surface of the water using the requisite mechanical equipment such as spraying units, spray guns, centrifuging equipment, etc. Mechanical application also ensures better adhesion to the substrate, which can be concrete, steel, wood or other conventional materials.In addition to being highly economic as a result of the higher coating capacity compared with manual application, the process of the invention inter alia also permits the corrosion protection coating of nonuniform surfaces and surfaces which are inaccessible when using a brush or roller such as undercuts, gaps, cracks, etc, i.e. those parts which can be in contact with water and air. It is particularly advantageous to use a solvent4ree, low viscosity, sprayable epoxy resin-hardener mixture containing corrosion inhibiting pigments and/or inertfillers. This material particularly effectively satisfies the aforementioned basic requirements such as specific gravity, immiscibility with water, reaction hardenability and freedom from solvents. By adding suitable agents, the material can also be given the necessary low surface tension, i.e. a high wetting power. When the coating material is applied by the airless process it can be advantageous to build up a pneumatic cushion round the coating material fans formed, which eliminates the resistance of the surrounding water and increases the impact speed of the individual coating particles, ensuring better adhesiveness. The invention is described in greater detail hereinafter relative to examples. Example A : application by air atomization A material consisting of 40% epoxy resin based on bisphenol A with an epoxy equivalent weight of approximately 200,30% specifically heavy fillers such as zinc and/or barium sulphate, additions of titanium compounds as wetting agents, is hardened with a cycloaliphatic amine having a hydrogen equivalent weight of approximately 150. The material is sprayed by means of a pot-type spray gun having a 3 mm nozzle onto a Sa 3-blasted steel test plate with a peak-to-valley height of 65,cm, using an air pressure of 6 bar, a spraying distance of 3 to 5 cm and at a water depth of 1 m. The coating thickness obtained is approximately 300 iim, it hardens uniformly and forms a closed, flat, uniform coating. Example B : application by airless process A material consisting of 20% epoxy resin based on bisphenol A with an epoxy equivalent weight of approximately 190,25% tar oil with a viscosity of 2000 to 3000 mPas, 30% inert fillers and a small amount of titanium compounds as the wetting agent is hardened with a hardener mixture of aromatic amines and aliphatic amine adducts. The material is sprayed onto Sa 3-blasted metal sheets with a peak-to-valley height of approximately 65 clam using a 1: 60 airless pump and a 0.66 mm nozzle with a spraying distance of approximately 5 cm and at a water depth of 50 cm. The coating thickness is on average 100 elm and has the characteristics described in example A. Example C: application by combined airless and air process Same conditions and requirements as in example B, except that air jets are positioned on either side of the airless material nozzle, so that on spraying the material there is also a 6 bar air pressure. CLAIMS
1. A process for applying reaction-hardening two-component or multicomponent coating materialps to underwater surfaces, wherein a coating material with a high wetting power is applied in finely dispersed manner by low pressure or airless spraying, centrifuging, etc.
2. A process according to claim 1, wherein the coating material used is a solvent-free, low viscosity, sprayable epoxy resin-hardener mixture containing active corrosion inhibiting pigments and/or inert fillers.
3. A process according to claims 1 or 2 in which the coating material is applied by the airless process, wherein a pneumatic cushion is built up round the coating material fans formed.
4. A process of applying reaction-hardening two-component or multicomponent coating materials to underwater surfaces, substantially as herein particularly described in any one of the foregoing examples.
GB08219824A 1981-07-13 1982-07-08 Process for applying reaction-hardening two-component or multicomponent coating materials to underwater surfaces Withdrawn GB2105218A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19813127651 DE3127651A1 (en) 1981-07-13 1981-07-13 METHOD FOR APPLYING REACTION-HARDENING TWO- OR MULTI-COMPONENT COATING MATERIALS TO SURFACES UNDER WATER

Publications (1)

Publication Number Publication Date
GB2105218A true GB2105218A (en) 1983-03-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB08219824A Withdrawn GB2105218A (en) 1981-07-13 1982-07-08 Process for applying reaction-hardening two-component or multicomponent coating materials to underwater surfaces

Country Status (3)

Country Link
DE (1) DE3127651A1 (en)
GB (1) GB2105218A (en)
NO (1) NO822411L (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2756209A1 (en) * 1996-11-22 1998-05-29 Massard Rene Poured resin protection of buried cables
WO1999061710A1 (en) * 1998-05-26 1999-12-02 Massard Rene Resin casting method for protecting in situ underground cables
GB2368338A (en) * 2000-10-28 2002-05-01 Richard J Foster Epoxy resin coatings for hydraulic mortars

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH707140B1 (en) 2012-10-16 2018-03-29 Fischer Norbert Passive protection system for hydraulic engineering systems.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2756209A1 (en) * 1996-11-22 1998-05-29 Massard Rene Poured resin protection of buried cables
WO1999061710A1 (en) * 1998-05-26 1999-12-02 Massard Rene Resin casting method for protecting in situ underground cables
GB2368338A (en) * 2000-10-28 2002-05-01 Richard J Foster Epoxy resin coatings for hydraulic mortars

Also Published As

Publication number Publication date
DE3127651A1 (en) 1983-01-20
NO822411L (en) 1983-01-14

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)