Definitions

• the invention relates to water-borne zinc silicate shop primer compositions including a suitable amount of zinc, micaceous iron oxide and/or graphite and optionally a second filler.
• Shop primers or pre-construction primers, are paints intended for short-term protection of steel during fabrication and before application of the full paint system. It must protect steel from rusting in usually aggressive environments and provide a sound surface for subsequent coats.
• compositions include zinc powder in an organic resin such as an epoxy resin, an epoxy ester, a polyurethane, a polystyrene resin or a silicone resin. Coatings based on these organic binders are not well suited for coating steel that must ultimately be welded because the binder tends to decompose from the heat of the weld, resulting in pores in the weld seams.
• organic resin such as an epoxy resin, an epoxy ester, a polyurethane, a polystyrene resin or a silicone resin.
• compositions based on an organic resin compositions based on a silicate-based binder system have been developed. Such compositions can be divided into two separate classes, namely water-borne or solvent-borne compositions.
• the vaporised substances can penetrate the weld root and become entrapped, creating a porous weld. It is sometimes possible to partially overcome the porosity problem by reducing the welding speed sufficiently to allow the gas to escape ahead of the weld. Even when this technique is successful, however, it results in increased fabrication costs due to reduced welding speed.
• WO 88/06177 discloses shop primer composition comprising zinc powder, fillers and pigments including a certain proportion of conductive fillers and pigments, anti-settling agents, optionally thickening agents, a silicate-type binder, and a solvent
• WO 88/06177 discloses shop primer composition comprising zinc powder, fillers and pigments including a certain proportion of conductive fillers and pigments, anti-settling agents, optionally thickening agents, a silicate-type binder, and a solvent
• Zimmermann, Eur. Coatings. J, 1 991 , 1 , 14-1 9, discloses solvent-borne compositions in which a portion of zinc has been replaced by fillers, e.g. micaceous iron oxide.
• Makishima et al. U.S. Pat. No. 4,01 1 ,088 have proposed an anti-corrosive coating composition comprising 5 to 80% of a binder, which is either potassium silicate or ammonium silicate, and 20 to 95% of a pigment mixture of zinc powder and iron phosphide and/or nickel phosphide.
• a binder which is either potassium silicate or ammonium silicate
• the ratio between zinc powder and phosphide should be in the range of 8:2 to 2:8 as "if the proportion of zinc is smaller than this range, the electrochemical anti-corrosive effect by zinc powder is insufficient, and if the proportion of phosphide is smaller than the above range, the weldability of the resulting coating is reduced.”
• the ratio of silicate to potassium should be between 2.5 and 4.0. If the molar ratio is smaller than 2.5, the film forming property is said to be insufficient and if the molar ratio is larger than 4.0, the stability of the binder is said to be reduced.
• the average particle size of the zinc powder and the phosphide is generally 5 ⁇ m. Inclusion of other fillers is not suggested. Furthermore, it is described by Makishima et al. that useful properties are only found for the combination of the phosphide fillers and inorganic silicate binders, i.e. water soluble silicate binders.
• Falberg U.S. Pat. No. 5,580,371 has proposed yet another example of a zinc- containing primer that provides a durable, corrosion-resistant coating, combined with suitable weldability.
• the primer comprises zinc, iron phosphide and an aqueous potassium silicate solution wherein the ratio of silicate to potassium is between 4.1 and 6.0. It appears to be crucial that the amount of zinc in the pigment/filler part of the composition is 35-90% by weight and that the amount of iron phosphide in the pigment/filler part is 1 0-65% by weight. It is stated that the most preferred particle size for zinc as well as for iron phosphide is in the range of 3-8 ⁇ m.
• WO 98/58028 describes water-borne protective coatings (i.a. preconstruction primers) comprising zinc dust, Group IA metal silicates, colloidal silica and a carbonate- containing internal hardener.
• the composition may comprise pigments and fillers (among which micaceous iron oxide is mentioned as an example).
• the role of the pigment and fillers is apparently only to make a film of the coating non-transparent as it is stated that "[t]he amount of pigment and filler that is used to form the composition is understood to vary, depending on the particular composition application, and can be zero when a clear composition is desired". This is confirmed by the examples where no filler is used in the example illustrating a pre-construction primer.
• water-borne zinc silicate shop primers comprising zinc, a well-defined amount of a first filler selected from micaceous iron oxide and graphite, and optionally a portion of a second filler are cost-efficient and provide excellent properties with respect to weldability, corrosion resistance for a sufficient period of time, etc.
• the present invention thus provides a water-borne shop primer composition
• a water-borne shop primer composition comprising: (a) 5-40% by volume of a pigment mixture,
• said pigment mixture comprises
• a first filler selected from micaceous iron oxide and/or graphite, and 0-50% by weight of a second filler.
• the present invention also provides a method of using a shop primer composition for temporary protection of a steel surface, and a method for the manufacture of a steel construction.
• the shop primer composition according to the present invention is preferably a fast drying primer which, when applied onto metallic surfaces, e.g. steel or steel alloy surfaces, as a 10-30 ⁇ m dry film, provides an efficient anti-corrosive protection of the steel material for at least 6 months, and which does not have any detrimental effect on welding of steel surfaces coated with the composition.
• the shop primer composition of the invention comprises, as essential constituents, (a) a pigment mixture comprising zinc, micaceous iron oxide and/or graphite and optionally one or more second fillers; (b) one or more silicates; and (c) an amount of water.
• the composition may also contain one or more additives, which should not impair the anti-corrosive protection or excellent welding properties of the resultant composition.
• the combination of zinc and the filler(s) is to be considered as the pigment mixture of the shop primer.
• Pigments are generally characterised in that they render the final shop primer coating non-transparent and non-translucent.
• the pigments of the pigment mixture in the present context are furthermore selected from pigment-like ingredients. These materials are characterised in that they do not render the paint non-translucent and therefore do not contribute significantly to hide any material below the coating.
• possible constituents of the pigment mixture which at least includes zinc and micaceous iron oxide and/or graphite, are chosen based on their combined anti-corrosive and weldability properties when included in the water-borne zinc silicate shop primer composition.
• the pigment mixture constitutes 5-40% by volume, such as 10-35% by volume, preferably 1 6-30% by volume, of the (wet) composition.
• the pigment mixture preferably constitutes 25-75% by weight, preferably 35-70% by weight, in particular 45-65% by weight, of the (wet) shop primer composition.
• zinc which constitutes 40-90% by weight, such as 50-85% by weight, of the pigment mixture.
• the zinc content is preferably 60-90% by weight, such as 70- 85% by weight or 75-90% by weight.
• the zinc content may be 40-60% by weight, such as 45-55% by weight, of the pigment mixture.
• the zinc used in the composition can be metallic zinc in the form of a powder or flakes, hollow spheres embedded with zinc on the surface, minerals embedded with zinc on the surface, and polymers embedded with zinc on the surface.
• the zinc can be surface-treated metallic zinc chemically inert to the aqueous environment.
• the zinc may be presented in the form of a paste.
• the zinc has a mean particle size in the range of 0.5-20 ⁇ m, such as 1 -1 5 ⁇ m, preferably 2-5 ⁇ m or 6-9 ⁇ m.
• the zinc is in the form of zinc powder, especially of the stated particle size ranges.
• the content of a particular amount of the first filler i.e.
• micaceous iron oxide and/or graphite is one of the main features of the present invention. It is presently believed that the content of the first filler should be 5-60% by weight, such as 5-40% by weight, or 10-40% by weight, in particular 5-25% by weight, especially 10-25% by weight, of the pigment mixture. It is envisaged that particular "high" first filler compositions may be applicable as well; such compositions may have a content of 25- 60% by weight, such as 30-50% by weight, of the first filler, i.e. micaceous iron oxide and/or graphite .
• the first filler comprises micaceous iron oxide.
• the amount of micaceous iron oxide is at least 5% by weight of the pigment mixture.
• the first filler comprises micaceous iron oxide as well as graphite.
• the weight ratio of micaceous iron oxide to graphite is preferably in the range of 1 00:0 to 20:80, such as 80:20 to 30:70.
• micaceous iron oxide can be natural or artificial micaceous iron oxide (MIO) such as Laminox 8 and Hematite.
• MIO micaceous iron oxide
• graphite can be natural or synthetic graphite such as macrocrystalline graphite, microcrystalline graphite, black graphite or amorphous graphite from natural sources, and electro-graphite from synthetic sources.
• the pigment mixture comprises a first filler as well as a second filler. It should be understood that even further filler components may be used as long as the total amount of the second fillers is within the ranges stated herein (such further fillers will all be calculated as "the" second filler).
• the combined amount of the first filler and any second filler is in the range of 10- 60% by weight, such as 10-25%, of the pigment mixture.
• the second filler (which in principle may be a single filler or a combination of two or more fillers) is independently selected from the group consisting of iron oxides (other than micaceous iron oxide); natural and precipitated barium sulphate, barytes, blanc fixe; aluminium silicates such as potassium aluminium silica and muscovite, kaolin, kaolinite, china clay; magnesium silicate and magnesium hydrosilicate, mica, talc, chlorite, tremolite; silica, surface treated silica, amorphous quartz, crystalline quartz, fumed silica; aluminium oxide and hydrate, bauxite, calcined bauxite; calcium magnesium carbonate, dolomite; natural and precipitated calcium carbonate; aluminium silicates, felds
• fillers should be of the phosphide type. In a particularly interesting embodiment, none of the fillers are of the phosphide type. It is furthermore believed that the special combination of fillers provides the possibility of reducing the zinc content of the pigment mixture and thereby improving the weldability without compromising the anticorrosive properties.
• the pigment mixture in one preferred embodiment comprises a first filler and a second filler.
• the second filler includes barium sulphate.
• the second filler includes kaolin.
• the second filler includes muscovite.
• the first filler typically comprises micaceous iron oxide.
• the binder comprises one or more water-soluble silicates.
• the silicates are selected from water-soluble silicates resulting in inorganic shop primers which are hardly burned and do not decompose upon welding.
• water-soluble silicates are alkali metal silicates, such as lithium silicate, sodium silicate, or potassium silicate, and ammonium silicates, such as tetraethanol ammonium silicate, or diethanol morpholinium silicate.
• the binder comprises lithium silicate, sodium silicate, and potassium silicate among which lithium silicate and potassium silicate are the most preferred ones.
• An interesting feature of the invention appears to be the complementary effects obtained by the combination of zinc and micaceous iron oxide and/or graphite, preferably at least micaceous iron oxide, and a second filler, in the above-mentioned specific ratios.
• any further fillers added may (or may not) fill any "gaps" in the total particle size distribution of zinc, micaceous iron oxide and/or graphite and the second filler.
• zinc itself has a mean particle size of 2-5 ⁇ m
• the optimal distribution of the particle size in the zinc silicate shop primer can be obtained.
• the zinc has a mean particle size in the range of 2-4 ⁇ m
• micaceous iron oxide and/or graphite has a mean particle size in the range of 5-1 0 ⁇ m
• the second filler has a mean particle size in the range of 8-1 5 ⁇ m.
• additives may be added to the composition of the invention as long as the percentages of zinc, the fillers, one or more silicates, and water are maintained within the stated ranges.
• additives examples include thickening agents, accelerators, wetting and dispersing agents.
• the amount of additives can be up to 22% by volume, such as such as 0.03-1 2% by volume, preferably 0.03-5% by volume, of the (wet) composition.
• Addition of one or more thickening agents in a ratio of 0.01 -10% by volume, such as 0.01 -5% by volume, preferably 0.05-2% by volume, of the (wet) composition improves the anti-settling properties, film formation and spraying properties of the shop primer.
• suitable thickening agents are bentonite, fumed/colloidal silica, natural thickeners (e.g. alginates), cellulosic thickeners, saccharides, and polysaccharides.
• wetting and dispersing agents that could be added include ammonium salts of polyacrylic acid, cellulose, non- ionic surfactants, anionic surfactants, and cationic surfactants.
• an accelerator in 0.01 -10% by volume, such as 0.02-5% by volume, preferably 0.2-2% by volume, of the (wet) composition to the composition the curing time of the composition can be reduced.
• Suitable accelerators are organo siliconates (e.g.
• alkaline borates such as alkaline borates, trimethyl borates, titanates, alcohols, colloidal silica, silanes, tin oxides, choline base, choline, chelates such as EDTA, iron oxide, red lead, sodium bisulphate, sodium bicarbonate, sodium dihydrogen phosphate, potassium chloride, potassium bromide, and sucrose, preferably organo siliconates such as sodium methyl siliconate, sodium ethyl siliconate, sodium propyl siliconate, potassium methyl siliconate, potassium ethyl siliconate, potassium propyl siliconate, etc.
• organo siliconates such as sodium methyl siliconate, sodium ethyl siliconate, sodium propyl siliconate, potassium methyl siliconate, potassium ethyl siliconate, potassium propyl siliconate, etc.
• the present invention provides novel shop primers having a relatively low content of zinc and excellent properties with respect to corrosion resistance.
• the shop primer according to the present invention when applied as a 1 5-25 ⁇ m dry film to steel surfaces exposed outdoor for 6 months in accordance with the Standard Practice for Conducting Exposure Tests of Paints on Steel (ASTM D 1014- 95), preferably tests to a rust grade of 6-1 0, such as 7-10, in particular 8-10, when evaluated according to the Standard Test Method for Evaluating Degree of Rusting on Painted Steel Surfaces (ASTM D 610-95).
• the rust grade can be determined for red rust and for white rust. Suppression of red rust is particularly important as this form of rust will have a detrimental effect on welding.
• White rust can, although in a time consuming step, be removed by water rinsing before welding, but this is of course also undesirable. As will appear from the examples, red rust and even white rust can be reduced or even eliminated with the compositions of the present invention, thus making the products over-all much more cost effective.
• the rust grade for red rust is high, such as 7-10, in particular 8-10, more preferably 9-10, especially 10, after exposure for 6 months.
• the rust grade for white rust should preferably be at least 5, such as at least 6, preferably at least 7, more preferably 8 or 9, after exposure for 6 months.
• the present invention relates to a shop primer composition
• a shop primer composition comprising a pigment mixture, one or more alkali metal silicates, optionally one or more additives, and water
• the pigment mixture comprises 75-90% by weight, such as 78-88% by weight, of zinc and 10-25% by weight, such as 1 2-22% by weight, of the first filler, preferably comprising micaceous iron oxide.
• the best mode within this embodiment is illustrated with compositions 78, 1 62 and 149.
• the present invention relates to a shop primer composition
• a shop primer composition comprising a pigment mixture, one or more alkali metal silicates, optionally one or more additives, and water
• the pigment mixture comprises 70-90% by weight, such as 70-85% by weight, of zinc, 10-25% by weight, such as 10-20% by weight, of the first filler, preferably comprising micaceous iron oxide, and 3-20% by weight, such as 4-1 5% by weight, of a second filler.
• the best mode within this embodiment is illustrated with compositions 81 , 1 74 and 1 76.
• the present invention relates to a shop primer composition
• a shop primer composition comprising a pigment mixture, one or more alkali metal silicates, optionally one or more additives, and water
• the pigment mixture comprises 40-60% by weight, such as 40-55% by weight, of zinc, 10-25% by weight, such as 10-20% by weight, of the first filler, preferably comprising micaceous iron oxide, and 25-45% by weight, such as 30-45% by weight, of a second filler.
• the best mode within this embodiment is illustrated with composition 74 and 1 50.
• the present invention relates to a shop primer composition
• a shop primer composition comprising a pigment mixture, one or more alkali metal silicates, optionally one or more additives, and water
• the pigment mixture comprises 70-90% by weight, such as 75-90% by weight, of zinc, 10-25% by weight, such as 10-20% by weight, of the first filler, preferably comprising micaceous iron oxide as well as graphite, and 0-10% by weight, such as 0-8% by weight, of a second filler.
• the best mode within this embodiment is illustrated with compositions 84, 87 and 91 .
• the present invention relates to a shop primer composition
• a pigment mixture comprising a pigment mixture, one or more alkali metal silicates, optionally one or more additives, and water, wherein the pigment mixture comprises 40-60% by weight of zinc, 25- 60% by weight of the first filler, in particular micaceous iron oxide, and 0-25% by weight of a second filler.
• the final mixing of the components of a shop primer containing non surface-treated metallic zinc has to be done immediately before the application of the shop primer onto the steel material.
• at less reactive zinc quality e.g. zinc in the form of a zinc paste may be used.
• a typical procedure for the manufacturing of a shop primer is as follows: to the extent that a thickening agent and/or a wetting agent are included in the shop primer composition they are initially mixed with parts of or the total amount of water and stirred until dissolved. Any fillers that need to be ground in order to obtain the correct particle size distribution are added and the mixture is ground until the size of agglomerates of filler(s) is below 50 ⁇ m, preferably below 20 ⁇ m. Subsequently, any remaining fillers are added and the mixture is dispersed for 5-1 5 minutes. Finally, parts of or any remaining water and the silicate(s) are added. If the shop primer composition includes an accelerator it is typically added as the last component. Immediately before application of the shop primer, zinc and any remaining water are added to the mixture.
• the shop primer is advantageously provided as a kit for subsequent admixture, optionally with additional water in order to obtain the optimal sprayability.
• the present invention also relates to a kit for preparing a ready-to-use shop primer composition (optionally after addition of additional water), where the kit comprises a first separate portion comprising zinc and a second separate portion comprising pigment components other than zinc, one or more silicates, optionally one or more additives, and water, wherein combination of the first separate portion, the second separate portion and any additional water will give a shop primer composition as defined herein.
• the shop primer can be prepared by mixing a zinc powder or zinc paste composition comprising one or more of the fillers, and/or one or more of the additives, with a composition containing the remaining components and the added water. Kits having this constitution are also possible within the present invention.
• the shop primer is typically applied onto a steel surface, preferably by spraying, to a final thickness of 10-30 ⁇ m, such as 15-25 ⁇ m. Such a coating will provide a temporary protection to the steel surface.
• the present invention also relates to a method for temporarily protecting a steel surface with an anti-corrosive coating, the method comprising coating the steel surface with a shop primer composition as defined herein.
• the steel surface is preferably coated with a 10-30 ⁇ m layer of the shop primer composition.
• the anti-corrosive coating will preferably exhibit to a rust grade of 6-10 when tested after 6 months of exposure evaluated according to the Standard Test Method for Evaluating Degree of Rusting on Painted Steel Surfaces (ASTM D 610-95).
• ASTM D 610-95 Standard Test Method for Evaluating Degree of Rusting on Painted Steel Surfaces
• the rust grades with respect to red and white rust will preferably be as above.
• the thus coated steel surfaces will typically be stored for 2-40 weeks such as up to around 6 months, where after the steel surfaces can be used in the manufacture of steel constructions where the coated steel surfaces are surfaces of steel body parts of which the steel construction is constituted.
• the steel construction is assembled by welding and importantly, the steel body parts coated with the composition according to the invention can readily be welded to provide high quality junctions between the steel body parts of the steel constructions.
• the present invention also relates to a method for manufacturing a steel construction, said steel construction being constituted by a plurality of steel body parts, said method comprising the steps of:
• step (a) assembling at least a part of the steel construction by welding together at least two of the steel body parts, at least one of said at least two steel body parts being coated as in step (a).
• Composition 149
• Component A was prepared by mixing the following components in the approximate 5 proportions: 28 parts by weight (36 parts by volume) of water was mixed with 0.1 7 parts by weight (0.2 parts by volume) of sodium alginate (Manutex RM ex. Kelco) until dissolved. 38 parts (1 1 .1 parts of potassium silicate and 26.9 parts of water) by weight (40 parts by volume, corresponding to 5.9 parts of potassium silicate and 34.1 parts of water) of potassium silicate solution (Kali Wasserglass 28/30 ex. Henkel) and
• composition 149 was dispersed in the mixture. Prior to application, 52 parts by weight (86 parts by volume) of component A was mixed with 48 parts by weight (14 parts by volume) zinc powder (Zinc Dust Super Extra ex. Larvik Pigment SA - mean particle size 2-4 ⁇ m) so as to obtain composition 149.
• Composition 74
• Component A was prepared by mixing the following components in the approximate proportions: 6 parts by weight of water was mixed with 0.06 parts by weight of
• Composition 1 50 is a composition of Composition 1 50:
• Component A was prepared by mixing the following components in the approximate proportions: 6 parts by weight of water was mixed with 0.06 parts by weight of sodium alginate (Manutex RM ex. Kelco) until dissolved. 0.06 parts by weight of a solution of ammonium salt of polyacrylic acid (Pigmentverteiler A ex. BASF) and 36 parts by weight barium sulphate (Barytmehl F ex. Sachtleben - mean particle size 5-10 ⁇ m) was ground in the mixture. After grinding, the remaining 1 parts by weight of water, 32 parts by weight of potassium silicate solution (Kali Wasserglass 28/30 ex. Henkel) and 1 2 parts by weight of lithium silicate solution (Lithium Polysilicate 48 ex.
• Composition 162 is a composition of Composition 162:
• Component A was prepared by mixing the following components in the approximate proportions: 35 parts by weight of water was mixed with 0.06 parts by weight of sodium alginate (Manutex RM ex. Kelco) until dissolved. 0.06 parts by weight of a solution of ammonium salt of polyacrylic acid (Pigmentverteiler A ex. BASF) was added. 31 parts by weight of potassium silicate solution (Kali Wasserglass 28/30 ex.
• lithium silicate solution Lithium Polysilicate 48 ex.
• composition 162 was dispersed in the mixture. Prior to application, 53 parts by weight of component A was mixed with 47 parts by weight zinc powder (Zinc Dust Super Extra ex. Larvik Pigment SA - mean particle size 2-4 ⁇ m) so as to obtain composition 162.
• composition 174
• Component A was prepared by mixing the following components in the approximate
• Composition 176
• Component A was prepared by mixing the following components in the approximate 30 proportions: 6 parts by weight of water was mixed with 0.06 parts by weight of sodium alginate (Manutex RM ex. Kelco) until dissolved. 0.06 parts by weight of a solution of ammonium salt of polyacrylic acid (Pigmentverteiler A ex. BASF) and 6 parts by weight quartz (Sikron M-500 ex Sibelco S.C.R. Sibalco SA - mean particle size 2-3 ⁇ m) was ground in the mixture. After grinding, the remaining 31 parts by weight of water, 32 parts by weight of potassium silicate solution (Kali Wasserglass 28/30 ex. Henkel) and 1 2 parts by weight of lithium silicate solution (Lithium Polysilicate 48 ex.
• Composition 78
• Component A was prepared by mixing the following components in the approximate
• Composition 81
• Component A was prepared by mixing the following components in the approximate 30 proportions: 1 8 parts by weight of water was mixed with 0.1 3 parts by weight of sodium alginate ( Manutex RM ex. Kelco) until dissolved. 5 parts by weight muscovite (Mical S180 ex Lubrizol Coating additives GmbH - mean particle size 6-8 ⁇ m) was ground in the mixture. After grinding, the remaining 21 parts by weight of water, 28 parts by weight of potassium silicate solution (Kali Wasserglass 28/30 ex. Henkel) and
• Composition 84
• Component A was prepared by mixing the following components in the approximate proportions: 18 parts by weight of water was mixed with 0.1 3 parts by weight of sodium alginate (Manutex RM ex. Kelco) until dissolved. The remaining 22 parts by weight of water, 29 parts by weight of potassium silicate solution (Kali Wasserglass 28/30 ex. Henkel) and 13 parts by weight of lithium silicate solution (Lithium Polysilicate 48 ex. Du Pont) was added and the mixture was stirred for 1 hour. Finally,
• Composition 87
• Component A was prepared by mixing the following components in the approximate proportions: 18 parts by weight of water was mixed with 0.18 parts by weight of sodium alginate (Manutex RM ex. Kelco) until dissolved. The remaining 30 parts by weight of water, 20 parts by weight of potassium silicate solution (Kali Wasserglass 28/30 ex. Henkel) and 9 parts by weight of lithium silicate solution (Lithium Polysilicate 48 ex. Du Pont) was added and the mixture was stirred for 1 hour. Finally, 1 6 parts by weight of micaceous iron oxide (Laminox ZR ex. Omya - particle size 5-10 ⁇ m, 95% ⁇ 25 ⁇ m) and 7 parts by weight of graphite (Graphit AF96/97 ex.
• Example 1 (MIO + graphite + muscovite)
• Composition 91
• Component A was prepared by mixing the following components in the approximate proportions: 18 parts by weight of water was mixed with 0.13 parts by weight of sodium alginate ( Manutex RM ex. Kelco) until dissolved. 5 parts by weight muscovite (Mical S180 ex Lubrizol Coating additives GmbH - mean particle size 6-8 ⁇ m) was ground in the mixture. After grinding, the remaining 22 parts by weight of water, 29 parts by weight of potassium silicate solution (Kali Wasserglass 28/30 ex. Henkel) and 1 3 parts by weight of lithium silicate solution (Lithium Polysilicate 48 ex. Du Pont) was added and the mixture was stirred for 1 hour. Finally, 9 parts by weight of micaceous iron oxide (Laminox ZR ex.
• Composition 108
• Component A was prepared by mixing the following components in the approximate proportions: 7 parts by weight of water was mixed with 0.07 parts by weight of sodium alginate (Manutex RM ex. Kelco) until dissolved. 0.07 parts by weight of a solution of ammonium salt of polyacrylic acid (Pigmentverteiler A ex. BASF) and 37 parts by weight kaolin (China Clay, Grade E ex. ECC International - mean particle size 5 ⁇ m, 80% ⁇ 10 ⁇ m) was ground in the mixture. After grinding, the remaining 2 parts by weight of water, 39 parts by weight of potassium silicate solution (Kali Wasserglass 28/30 ex. Henkel) and 1 5 parts by weight of lithium silicate solution (Lithium Polysilicate 48 ex.
• component A was added and the mixture was stirred for 1 hour. Prior to application, 65 parts by weight of component A was mixed with 35 parts by weight zinc powder (Standard 7 ex. Larvik Pigment SA - mean particle size 6-9 ⁇ m). The mixture was thinned with 22 parts by weight of water before application so as to obtain composition 108.
• Composition 93 Component A was prepared by mixing the following components in the approximate proportions: 6 parts by weight of water was mixed with 0.06 parts by weight of sodium alginate (Manutex RM ex. Kelco) until dissolved. 0.06 parts by weight of a solution of ammonium salt of polyacrylic acid (Pigmentverteiler A ex. BASF) and 49 parts by weight barium sulphate (Barytmehl F ex. Sachtleben - mean particle size 5-10 ⁇ m) was ground in the mixture. After grinding, the remaining 1 parts by weight of water, 32 parts by weight of potassium silicate solution (Kali Wasserglass 28/30 ex. Henkel) and 12 parts by weight of lithium silicate solution (Lithium Polysilicate 48 ex.
• 6 parts by weight of water was mixed with 0.06 parts by weight of sodium alginate (Manutex RM ex. Kelco) until dissolved. 0.06 parts by weight of a solution of ammonium salt of polyacrylic acid (Pigmentverteiler A ex. BASF)
• component A was added and the mixture was stirred for 1 hour.
• 70 parts by weight of component A was mixed with 30 parts by weight zinc powder (Standard 7 ex. Larvik Pigment SA - mean particle size 6-9 ⁇ m).
• the mixture was thinned with 22 parts by weight of water before application so as to obtain composition 93.
• Composition 107
• Component A was prepared by mixing the following components in the approximate proportions: 7 parts by weight of water was mixed with 0.07 parts by weight of sodium alginate (Manutex RM ex. Kelco) until dissolved. 0.07 parts by weight of a solution of ammonium salt of polyacrylic acid (Pigmentverteiler A ex. BASF) and 37 parts by weight nepheline syenite (Minex S 20 ex. North Cape Nefelin A/S - mean particle size 5 ⁇ m) was ground in the mixture. After grinding, the remaining 2 parts by weight of water, 39 parts by weight of potassium silicate solution (Kali Wasserglass 28/30 ex. Henkel) and 1 5 parts by weight of lithium silicate solution (Lithium Polysilicate 48 ex.
• component A was added and the mixture was stirred for 1 hour. Prior to application, 65 parts by weight of component A was mixed with 35 parts by weight zinc powder (Standard 7 ex. Larvik Pigment SA - mean particle size 6- 9 ⁇ m). The mixture was thinned with 22 parts by weight of water before application so as to obtain composition 107.
• Composition 109
• Component A was prepared by mixing the following components in the approximate proportions: 7 parts by weight of water was mixed with 0.07 parts by weight of sodium alginate (Manutex RM ex. Kelco) until dissolved. 0.07 parts by weight of a solution of ammonium salt of polyacrylic acid (Pigmentverteiler A ex. BASF) and 37 parts by weight quartz (Sikron M-500 ex Sibelco S.C.R. Sibalco SA - mean particle size 2-3 ⁇ m) was ground in the mixture. After grinding, the remaining 2 parts by weight of water, 39 parts by weight of potassium silicate solution (Kali Wasserglass 28/30 ex. Henkel) and 1 5 parts by weight of lithium silicate solution (Lithium Polysilicate 48 ex.
• Composition 96
• Component A was prepared by mixing the following components in the approximate proportions: 6 parts by weight of water was mixed with 0.06 parts by weight of sodium alginate (Manutex RM ex. Kelco) until dissolved. 0.06 parts by weight of a solution of ammonium salt of polyacrylic acid (Pigmentverteiler A ex. BASF) and 35 parts by weight barium sulphate (Barytmehl F ex. Sachtleben - mean particle size 5-10 ⁇ m) was ground in the mixture. After grinding, the remaining 1 part by weight of water, 30 parts by weight of potassium silicate solution (Kali Wasserglass 28/30 ex. Henkel) and 1 1 parts by weight of lithium silicate solution (Lithium Polysilicate 48 ex.
• Composition 97
• Component A was prepared by mixing the following components in the approximate proportions: 6 parts by weight of water was mixed with 0.06 parts by weight of sodium alginate (Manutex RM ex. Kelco) until dissolved. 0.06 parts by weight of a solution of ammonium salt of polyacrylic acid (Pigmentverteiler A ex. BASF) and 35 parts by weight barium sulphate (Barytmehl F ex. Sachtleben - mean particle size 5-10 ⁇ m) was ground in the mixture. After grinding, the remaining 1 part by weight of water, 30 parts by weight of potassium silicate solution (Kali Wasserglass 28/30 ex. Henkel) and 1 1 parts by weight of lithium silicate solution (Lithium Polysilicate 48 ex.
• Composition 1 10 is a composition of Composition 1 10:
• Component A was prepared by mixing the following components in the approximate proportions: 6 parts by weight of water was mixed with 0.06 parts by weight of sodium alginate (Manutex RM ex. Kelco) until dissolved. 0.06 parts by weight of a solution of ammonium salt of polyacrylic acid (Pigmentverteiler A ex. BASF) and 25 parts by weight kaolin (China Clay, Grade E ex. ECC International - mean particle size 5 ⁇ m, 80% ⁇ 10 ⁇ m) was ground in the mixture. After grinding, the remaining 2 parts by weight of water, 35 parts by weight of potassium silicate solution (Kali).
• Composition 99 is a composition of Composition 99:
• Component A was prepared by mixing the following components in the approximate proportions:34 parts by weight of water was mixed with 52 parts by weight of potassium silicate solution (Kali Wasserglass 28/30 ex. Henkel). 14 parts by weight of lithium silicate solution (Lithium Polysilicate 48 ex. Du Pont) was added and the mixture was stirred for 1 hour. Finally, 27 parts by weight of iron phosphide (Ferrophos HRS 21 32 - mean particle size 3 ⁇ m)) was dispersed in the mixture. Prior to application, 54 parts by weight of component A was mixed with 46 parts by weight zinc powder (Zinc Dust Super Extra ex. Larvik Pigment SA - mean particle size 2-4 mm) so as to obtain composition 99. Pigment mixture
• compositions having an amount of micaceous iron oxide and/or graphite in the pigment mixture of in the range of 10- 60% by weight, in particular 10-25% show remarkable anti-corrosive properties.
• the shop primer compositions according to the invention are superior to compositions comprising "other fillers” only (Reference examples 1 -4) and are excellent alternatives, and even improvements, to iron phosphide-containing shop primers (Reference examples 5-8).

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• 2002
  • 2002-02-26 EP EP02701242A patent/EP1478702A1/de not_active Withdrawn
  • 2002-02-26 AU AU2002234514A patent/AU2002234514A1/en not_active Abandoned

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