DE3219327A1 - Method for the production of air- and oven-drying water-dilutable paint binders - Google Patents

Abstract

The present invention relates to a method for the production of water-dilutable binders based on oxidatively drying, oil-modified alkyd resins and the use of these binders in air-drying and forced-drying paints. After addition of crosslinking agents, the products can also be used for the formulation of stoving lacquers. A) 15 to 50 % by weight of a polyester serving as the carrier resin, with the general construction principle <IMAGE> where R represents a radical of a tetravalent alcohol, preferably of pentaerythritol, whose hydroxyl groups are partially reacted with unsaturated oil fatty acids, optionally mixed with cyclic monocarboxylic acids (radicals R1) and under hemiester formation with anhydrides of aromatic, cycloaliphatic or aliphatic dicarboxylic anhydrides (radicals R2) as well as with aromatic, cycloaliphatic or aliphatic dicarboxylic acids and/or diisocyanates (radicals X) and where R3 can be equal to R1 or OH and n can be equal to 0-3, the fatty acid content being between 20 and 50 %, the acid number being between 50 and 100 mg of KOH/g and the components containing at least 1 hydroxyl group per 1000 g, and B) 50 to 85 % by weight of an alkyd resin prepared in a customary manner, dissolved in organic solvents, preferably white spirits as specified in DIN 51632, and modified with 30 to 65 % of unsaturated oil fatty acids, which has a hydroxyl number of 20-100 mg of KOH/g and an acid number of less than 10 mg of KOH/g.

Description

Process for the production of air and oven drying

water-thinnable paint binder Procedure for Manufacture of air- and oven-drying water-thinnable paint binders The present The invention relates to a process for the production of water-thinnable binders based on oxidatively drying, oil-modified alkyd resins and the use this binder in air-drying and force-drying paints. After addition of crosslinking agents, the products can also be used in the formulation of stoving enamels can be used.

Air-drying water-soluble paint binders are from the literature known in large numbers, the basic principle in all cases being one oxidatively drying binder by incorporating hydrophilic groups into a water-soluble one To bring shape. This is done either by introducing polyglycols or by the incorporation of carboxyl groups which, after salt formation with bases, form the resin molecule Bring into a water-soluble form. Such products are in many references described.

Thus, according to DE-AS 12 03 407 oil-modified alkyd resins with a Acid number below 30 mg KOH / g and a hydroxyl number below 120 mg KOH / g with ammonia or amines have been neutralized with high proportions of monoethyl glycol monoethers processed, which means that even with a low acid number of the resin is achieved.

Products with a higher acid number, which are used to achieve solubility in water not these extreme amounts of water-miscible or at least water-tolerant Solvents are required, for example in DE-OS 19 28 904, GB-PSS 962 974, 1 069 912, 1 075 081 and 1 234 955 or DE-PSS 12 61 259 and 24 16 658 or DE-OS 24 46 439 described.

It is in the nature of these polyester soaps that when thinned they will show abnormal viscosity behavior with water, i.e. that by the addition from water to polyester soap the viscosity in the range between approx. 55 and 35% - Solid resin content increases sharply, only becoming steep at a solids content below 30% to fall off. ~ Such water-based paints are for the current state of application technology largely due to their low application strength caused by this anomaly unusable because the paint is not full and looks unsightly. This lack ovar can partly be remedied by adding water-tolerant solvents, so that when diluting with water a steady decrease in viscosity is achieved, however, the paints largely lose their advantage of environmental friendliness. The proportion of the monoethylene glycol monobutyl ether which is mostly used in these cases is roughly in the same order of magnitude as that which can be used for dumpling Water. The same applies to the water-thinnable urethane and oil-modified ones Alkyd resins as described in DE-AS 22 39 094 or DE-OS 23 23 546 will.

Experience has shown that the spray or coating varnish necessary solvent requirements with the fatty acid content in the polyester and that hydroalkyl-rich acidic polyesters are a lower solvent need, but due to their hydrophilic character, films of insufficient Water resistance result. Both findings speak against the possibility of easy to apply, air-drying lacquer binders with a relatively high fatty acid content and low solvent content with high application solids, This is certainly also a reason for the lack of such products, which are required in practice is on the market.

It has now been found that the disadvantages mentioned can be overcome can and receives largely practical products, if. man combinations a specific carrier resin with one compatible with drying oils modified alkyd resins are used, the two partners optionally through a partial probe further improves its compatibility properties can be.

The present invention accordingly relates to a process for the production of oxidatively drying, water-thinnable paint binders based on alkyd resin, which are particularly suitable for the formulation of air-drying paints, which is characterized in that - (A) 15 to 50% by weight of a polyester serving as a carrier resin with the general construction principle where R represents a radical of a tetravalent alcohol, preferably of pentaerythritol, the hydroxyl groups of which are partially with unsaturated oil fatty acids, optionally in a mixture with cyclic nocarboxylic acids (radicals R) and with semi-ester formation with anhydrides of aromatic, cacloaliphatic or aliphatic dicarboxylic anhydrides (radicals R2) and with aromatic anhydrides , cycloaliphatic or aliphatic dicarboxylic acids and / or diisocyanates (radicals X). are reacted and where R3 can be R1 or OH and n O - 3, the fatty acid content between 20 and 50 70, the acid number between 50 and 100 mg KOH / g and this component containing at least 1 hydroxyl group per 1000 g, with ( B) 50 to 85% by weight of a conventionally prepared alkyd resin dissolved in organic solvents, preferably white spirit according to DIN 51 632, modified with 30 to 65% unsaturated oil fatty acids, which has a hydroxyl number of 20 to 100 mg KOH / g and an acid number of less than 10 mg KOH / g mixes or partially condenses at temperatures between 20 and 1600C without exceeding the limit of water solubility after neutralization and the binder obtained in this way by partial or complete neutralization of the carboxyl groups of the carrier resin with ammonia and / or Amines converted into the water-dilutable form.

The invention also relates to the use of these binders in unpigmented or pigmented form for the formulation of air-drying or Forced drying paints and - if necessary with the use of crosslinking agents, of oven-drying paints.

The binders produced according to the invention are distinguished by particularly good stability properties and processability. Because of the exclusively the proportion introduced into the binder by the carrier resin proportion (component A) of volatile bases and the low proportion of solvent, which again is only proportionate can consist of glycol ethers, these products are particularly environmentally friendly. The products show excellent drying and result in films that resemble the well-known Have the properties of conventional air-drying alkyd resins.

The carrier resin (component A) is an oil-modified polyester which, after neutralization of its carboxyl groups with bases, is water-soluble, according to the general structure principle represents, where in this formula R is the radical of a four-sided primary alcohol, preferably pentaerythritol, whose hydroxyl groups are partially with unsaturated oil fatty acids, optionally mixed with cyclic monocarboxylic acids (R1) and with half-ester formation with cyclic monocarboxylic acids (R1) and with half-ester formation with anhydrides of aromatic, .cycloaliphatic or aliphatic dicarboxylic anhydrides (R2) and aromatic, cycloaliphatic or aliphatic dicarboxylic acids and / or diisocyanates (X). The radical R3 can either be the same as a radical R1 or represent a free hydroxyl group. The index n can be between 0 and 3.

The preferred tetravalent primary alcohol is monopentaerythritol, welcluer in its customary form, possibly also proportionally subordinate .engen contains dipentaerythritol or tripentaerythritol used. Trade tetramethylolalkanes can also be used.

The unsaturated fatty acids used for esterification are the Commercially available fatty acids with iodine numbers above 120, such as those from natural drying Oils or from conversion products of these oils by saponification. For example, the fatty acids from linseed oil, soybean oil, whole tree seed oil, Safflower oil, wood oil, fish oil or dehydrated castor oil are listed. The fatty acids can also be present in modified form in polyester.

Such a modification is by way of example in a known manner Copolymerization with unsaturated monomers such as styrene, vinyl toluene or acrylic acid esters possible.

Benzoic acid and p-tert-butylbenzoic acid can be used as cyclic monocarboxylic acids and resin acids as found in the various Rosin varieties are available. The proportion of these cyclic monocarboxylic acids can depending on the desired drying and film properties, up to 50 mole percent the amount of fatty acids.

As dicarboxylic acids (radicals X of the general formula for the component A) the usual aromatic or cycloaliphatic dicarboxylic acids or their anhydrides, such as the various phthalic acids, naphthalenedicarboxylic acids, diphenyl-2,2'-dicarboxylic acid and their complete or partial hydrogenation products are used. Preferably Isophthalic acid is used to achieve optimal film properties. To increase The elasticity of the films can also contain aliphatic dicarboxylic acids alone or in part can be used to build molecules. Succinic acid belongs to this group and their homologues, in particular the homologues with 4-11 carbon atoms with straight-chain or branched alkylene radical.

The introduction of the for water solubility (after at least partial Salt formation with bases) responsible -carboxyl groups takes place through the formation of half-esters on part of the hydroxyl groups by means of aromatic, cycloaliphatic or aliphatic dicarboxylic acid anhydrides, e.g. B.

of o-phthalic anhydride or its hydrogenation products or maleic anhydride. The half-ester formation is preferably carried out with tetrahydrophthalic anhydride.

The preparation of the polyesters according to the general formula given advantageously takes place in 2 stages. The first stage is done in the usual way a hydroxyl-rich base polyester produced, whose hydroxyl groups proportionately is converted with the dicarboxylic anhydride into its half-ester. The starting materials are selected in terms of quantity so that the polyester has a fatty acid content of 20 up to 50% and an acid number between 50 and 100 mg KOH / g.

The hydroxyl content is adjusted so that at least one free Fydroxylgruppe is contained in 1000 g of the component what one Hydroxyl number of 56 mg KOH / g or more.

The component (B) adjusts in organic solvents, preferably higher-boiling gasoline hydrocarbons and monoethylene glycol monoalkyl ethers dissolved air-drying alkyd resin, which with component (A) due to its structure is largely tolerable. The compatibility is determined by the choice of raw materials, the fatty acid content and the corresponding hydroxyl number. The component (B) has an acid number of less than 10 mg KOH / g and is accordingly by itself not soluble in water even after the addition of bases. The hydroxyl content of component (B), expressed in hydroxyl numbers, is between 20 and 100 mg KOH / g, the unsaturated fatty acid content between $ 30 and $ 65.

The air-drying alkyd resins as they are used as component - <B) for Are used, are manufactured in the usual way or are on the market found as a commercial product.

In addition to the unsaturated fatty acids, component (B) can also be used in to a minor extent have aromatic or cycloaliphatic monocarboxylic acids. The preferred materials used are gasoline hydrocarbon solvents Y under the name white spirit in the trade and are according to DIN 51 632 as refined Petrol fractions with a boiling range of 130 - 2200C and an aromatic content defined by a maximum of 19% by weight.

In a preferred embodiment, a urethane-modified Alkyd resin used as component (B). These modified alkyd resins are produced in principle by replacing part of the dicarboxylic acid with a diisocyanate and -are the expert in the form of solutions in organic solvents as binders known for conventional paints. They are made by the implementation of low molecular weight, Alkyd resins rich in OH groups are produced with diisocyanates such as toluene diisocyanate.

A general improvement in the paint properties is achieved if the alkyd resins used as component (B) contain amino groups. The amino groups promote compatibility with the component through salt formation with the carboxyl groups (A) and thus expand the scope for combination. Furthermore, the pigment wetting promoted and the stability of the aqueous paints improved. It also becomes the slope reduced to surface defects such as edge alignment and crater formation. Drying speed, Water resistance and corrosion protection are not impaired if the Concentration of the amino groups with an amine number of a maximum of 25 mg KOH / g, based on the component (B) corresponds.

The amino groups can be converted into the alkyd resins by esterification of tertiary Alkanolamines such as triethanolamine or dimethy.

Ethanolamine can be installed. In a particularly simple and effective way Amino groups can be incorporated into urethane-modified alkyd resins. Included - relatively low molecular weight alkyd resin precursors (BI approx. 800 to approx.

2000, acid number below 2 mg KOH / g) in an inert organic solvent submitted and the piisocyanate added at about 5000. Then the mixture becomes like this Maintained at 70 - 800C for a long time until the content of NCO groups has dropped to approx.

50% of the initial value has fallen.

Now an amine becomes the general formula where Y stands for a hydroxyl or a primary or secondary amino group, R5 stands for an alkylene radical with 2 - 5 carbon atoms and R6 and R7 stands for an alkyl radical with 1 - 4 carbon atoms, diluted with small proportions of the solvent, added and the temperature to 100 ° C. This temperature is maintained until the NCO content has fallen below 0.1% and the desired molecular size, determined by the intrinsic viscosity, has been reached.

The above amines are tertiary alkanolamines such as dimethylethanolamine, Diethalethanolamine, dipropylethanolamine etc. as well as prim.tert. or sec.tert. Diamine-like Dimethylaminoethylamine, dimethylaminopropylamine, diethylaminopropylamine or N, N-diethyl-Nu lethylpropylenediamine. The amount of amine is chosen so that one Amine number of 5-25, preferably 5-15 mg KOH / g results.

Diisocyanates are used in the interests of drying and film hardness especially aromatic diisocyanates such as 4,4'-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate or 2,6-tolylene diisocyanate in terms of. In addition, aliphatic Diisocyanates such as 1,6-hexamethylene diisocyanate at. cycloaliphatic diisocyanates such as isophorone diisocyanate or 4.4 t -dicyclohexylmetha.ndiisocyanat- can be used. The commercially available isomer mixture of 2,4- and 2,6-tolylene diisocyanate is preferred used.

For the production of the air-drying binder combination the two components in a solids ratio of 15 to 50% by weight carrier resin (Component A): 50 to 85% by weight of the alkyd resin dissolved in organic solvents (Component B) mixed and mixed with ammonia or tertiary amines into a water-dilutable Form transferred.

A homogeneous, haze-free film after combining the two To achieve polyester, the rule applies that the oil content in both components is approximate is equal to. This is known to those skilled in the art from the fact that oil-rich alkyd resins when mixed with low-oil alkyd resins, dry cloudy and inhomogeneous. In some In some cases, a homogeneous film formation is possible even with different oil contents to achieve that the resin mixture at an elevated temperature of a precondensation Subjected at 60 to 1600C. It is of course that at this condensation the soluble state must not be exceeded.

After neutralization with bases, a binder is obtained which without the use of complicated dispersing systems by simply stirring in water Forms stable emulsions, i.e. high solids content with a low solvent content and have excellent application and film properties.

If the binders are processed with pigments and fillers, it is advantageous to grind before adding the water. The on base correspond to the paints obtained according to the invention produced binder combinations the usual medium or long oil based paints in their drying properties Alkyd resins. The film properties also paint a similar picture. You are suitable especially for industrial painting, especially when using forced drying at 60 - 800C the influence of changing air humidity during drying is excluded will. The binders can also be used when crosslinking agents such as amino or phenolic resins are used to formulate stoving enamels, this component also being used may optionally be present during the prereaction. These varnishes can also be used for low baking temperatures of approx. 80 -1Z00C. -The following Examples illustrate the invention. All quantities are given in parts or percentages Unless otherwise stated, refer to weight units. All The viscosity was determined in accordance with DIN 53 211/20 ° C.

The petrol hydrocarbons given in the examples correspond of DIN 51 632 (white spirit) and are defined in individual cases by their key figures.

Example 1: (a) Component (A): In a suitable reaction vessel become in the azeotrope process (toluene) at 220cC 545 parts monopentaerythritol (4 mol), 490 parts isophthalic acid (3 moles) and 1150 parts linseed oil fatty acid (4.1 moles) up to one Acid number of approx. 1 mg KOH / g esterified. The towing center is created by applying The vacuum is removed and 456 parts of tetrahydrophthalic anhydride (3 Mol) added and reacted at 100 ° C up to an acid number of 75 mg KOH / g, wherein a viscosity corresponding to a flow time of 70 seconds (measured 50% in BG = ethylene glycol monobutyl ether) is achieved. Then the resin is with Ethylene glycol monoethyl ether (EG) diluted to a solids content of 90%.

(b) Component (B): By esterification of 380 parts of technical linseed oil fatty acid with 104 parts of glycerine, 50 parts of pentaerythritol and 100 parts of phthalic anhydride produced a low molecular weight alkyd resin with an acid number below 2 mg KOH / g. - 80 parts of this alkyd resin precursor are mixed with 10 parts of diethylene glycol dimethyl ether and 27 teaspoons of aromatic-free white spirit. Then 18 parts of toluene diisocyanate (technical mixture of 80% 2,4 and 20% 2,6-isomers) added and the approach heated to 70 ° C .; after 50 minutes the NCO content is 4.15%, that is 47% of the theoretical starting value.

There is now a mixture of 2 parts dimethylethanolamine and 6 parts Test gasoline added and the mass heated to 1000C. After a further 6 hours the NCO content is less than 0.1% and the intrinsic viscosity (measured in chloroform at 20 "C) 10.1 ml / g. The resin solution has a solids content of 70 g and a Amine number of 12.5 mg SOH / g.

(c) Binder combinations: 45 parts of component (A) 90% and 85 The component (B), 70%, is mixed for 3 hours at 140 ° C. with a supply of inert gas touched. It is then cooled to 50 ° C. and adjusted to pH with approx. 4.2 parts of triethylamine set from 8.1 to 8.6. The resulting resin has a solids content of 75%.

(d) Preparation of a clear coat: 100 parts of the 75% resin become with 2 parts lead octoate solution (20% metal content; dissolved in white spirit) and 3 parts Cobalt octoate solution (2% metal content; dissolved in white spirit) mixed homogeneously and then slowly diluted with deionized water. The result is a stable one Emulsion having the composition 33: o resin; 13 70 solvents and 54 70 water. This lacquer composition dries to a firm grip within 1 hour at room temperature Paint film with good gloss. After a drying time of 24 hours, a shows film applied to cleaned sheet iron after storage in water for two days 200C neither softened nor blistered.

Example 2: (a) Component A: In a suitable reaction vessel in the azeotrope process at 2300C 408 parts monopentaerythritol (3 mol), 148 parts adipic acid (1 mol), 840 parts of linseed oil fatty acid (3 mol) and 267 parts of p-tert-butylbenzoic acid (1.5 Mol) with the addition of dibutyltin dilaurate as esterification catalyst in the presence from 160 Tlen white spirit (e.g. Shellsol DT) to an acid number of approx.

1 mg KOH / g esterified. Then gasoline is used at 90 ° C with the same test the resin is diluted to 56-70 and at 60 ° C. 174 parts of toluene diisocyanate become rapidly admitted. The temperature is kept at 600 ° C. for 2 hours, then the temperature is increased by 20 ° C. per hour to 120 "C; this increases the viscosity, measured on a solid at 50 Cc sample diluted with BG for 60 - 70 seconds. After half-ester formation with 296 parts Phthalic anhydride (2 moles) is obtained Harz with the following key figures: Solids content: 60%; Viscosity (50% solution in BG): 86 seconds; Acid number: 58 mg KOH / g.

(b) Component (B): 150 parts technical linoleic acid, 45 parts p-tert-butylbenzoic acid, 87. parts of pentaerythritol and 100 parts of phthalic anhydride are azeotroped at 2200C Esterified with xylene until the acid number is between 7 and 9 mg KOH / g and the viscosity between 55 and 65 seconds (50% in xylene). The resin. becomes 80 with EG % Solids content diluted.

(c) Binder combination: 50 parts of component (A), 60% and 88 parts Component (B), 80% strength, are mixed in a suitable reaction vessel and taken under The inert gas feed was stirred at 1200C for 2 hours. Then at fo'C 3.3 parts of triethylamine admitted. The homogeneous resin solution has a pH of 7.6 and a solids content of 71%; It can be effortlessly by simply stirring water into a stable Transfer emulsion.

(d) Preparation of a varnish: 141.7 parts of this 71% strength resin become with 2 parts lead octoate solution (20 goat solution in white spirit) and 3 parts cobalt octoate solution (Solution containing 2% Co in white spirit) mixed homogeneously. The resin solution will with 30 parts of red iron oxide, 25 parts of microtalk, 70 parts of barium sulfate, 10 parts of lead silica chromate and grind 50 parts of water until homogeneous. After adding 80 parts of water, one contains a brushable metal primer approximately of the following composition: 24% binder 1 0 triethylamine 32 aO water 10 gO organic solvent 33 'pigments and fillers These Paint dries dust-free in 3 hours and is touch-proof after 8 hours filmed. If test panels have been dried in water for only 24 hours, 20 "C, there is no blistering or softening of the film after 4 days to observe.

Example 3: (a) Component (A): Analogously to that described in Example 1 An acidic polyester is produced. from 560 Tlen pentaerythritol, 490 parts of isophthalic acid, 90 parts of p-tert-butylbenzoic acid; 980 parts isomerized Fatty acid with approx. 50% conjuene groups and 520 parts of tetrahydrophthalic anhydride. The batch is diluted with EG to a solids content of 90%. - - - (b) component (B): In the same way as in Example 1, but without the addition of tetrahydrophthalic acid is made of an OH-rich polyester and has a solids content of 80 % redeemed with EG.

(c) Preparation of a binder combination for stoving enamels: 66 Parts of component (A), 50 parts of component (B) and 40 parts of one in 60 pointer Solution in the EC - the melamine-formaldehyde condensate (manufactured in a well-known Way of 1 mol of melamine and 3 mol of formaldehyde and largely etherified with EG) heated to 55-60 ° C. with stirring until the viscosity of a 50-70 solid containing solution in BG has risen to 200 seconds. The resin is 7.5 Tlen dimethylethanolamine neutralized and EG to a solids content of 75% diluted.

(d) Stoving enamel: 100 parts of the binder are slowly mixed with 130 Mix in deionized water. A stable emulsion is created, which has a Solids content of 33%, an organic solvent content of 11% and a Has a water content of 56%. A film baked at 80 "C for 30 minutes shows good gloss, excellent mechanical properties and good resistance against chemical attacks.

Example 4: (a) Component (A): In a suitable reaction vessel become azeotropic at 230-2400C 540 parts monopentaerythritol (4 moles 498 parts isophthalic acid (3 mol) and 1400 Tle isomerized soybean oil fatty acid with a conjuene content of 50% (5 moles) esterified. As soon as the acid number has fallen below 2 mg KOE / g, removed the circulating agent is cooled to 110 ° C. by vacuum and 300 parts of succinic anhydride are used (3 moles) too. The mixture is kept at 110 ° C. for 2 to 3 hours until a viscosity measured as 50 % solution in BG) of 75 - 85 seconds is reached. Then you dilute with approx. 600 Tlen diethylene glycol monoethyl ether (DEGME) and thus obtain an 80% solution.

(b) Component (B): 200 parts of safflower oil are mixed with 47 parts of pentaerythritol in the presence of 0.2 parts lead octoate (10%) and 0.2 parts calcium octoate (4%) interesterified at 2500C until a sample 1: 6 is clearly soluble in alcohol at 200C. Then the temperature is lowered to 200 "C and 80 parts of phthalic anhydride and 10 Tle tall oil fatty acid (resin acid content below 2%) is added. Then at 230 "C under azeotropic cycle with xylene up to an acid number below 3 mg KOH / g esterified.

Now 10 parts of triethanolamine are added and at 2300C for so long held until a sample remains clear on a glass plate when it cools down (approx Min.). Then 10 parts of phthalic anhydride are added and at 230 ° C. with an azeotrope cycle esterified until an acid number of 3 - 5 mg KOH / g and a limiting viscosity number (chloroform, 20 ° C) of 15 - 17 ml / g is reached. The product is cooled and flavored free White spirit diluted to approx. 85% solid content.

The resin has the following characteristics: acid number: 3 mg KOH / g; Amine number: 11.2 mg KOH / g; Limiting viscosity number (CHCl3 / 20 ° C): 16.0 ml / g.

(c) Binder combination: 50 parts of component (A), 80%, 70 parts of component (B), 85% and 1T1DEGE are placed in a suitable reaction vessel at 60 ° C with a supply of inert gas mixed, then adjusted to a pH of 8.2-8.4 with 4 parts of triethylamine. The binder thus obtained is a clear, highly viscous liquid with a Solids content of 80%. The viscosity of a solids content of 50% with BG diluted test solution is 50 seconds.

(d) Production of a wood glaze: 125 parts binder combination.

tion, 2 parts lead octoate solution (20% in white spirit), 1 part cobalt octoate solution (2 70g in white spirit) and 3 parts pentachlorophenol are mixed homogeneously, then Add 225 teaspoons of water. The glaze color obtained in this way consists of 22.5% binder, 1.1% amine, 6.7% organic solvent and siccative and 63% water and is suitable excellent as a glaze paint for all types of wood.

Spruce wood panels coated with it are used after 2 years of outdoor exposure no change in the surface.

(e) Production of a paintable varnish ready for painting: 123 parts binder combination C, 2 parts lead octoate solution (20% in white spirit), 1 part cobalt octoate solution (2 risers in white spirit), 80 parts titanium white (rutile quality), 0.6 parts silicone-free leveling agent (10 aig in BG), 0.6 parts anti-skinning agent, 10 parts EG and 120 parts water are more common Grind wisely. The lacquer consists of approx. 30% binding agent, 1% amine, 10% organic Solvent, 24% Ti02 and 35% water.

Applied to primed wood or metal, this paint dries dust-free in 2 hours and becomes a high-gloss, grip-proof after 6 hours Film dried out. In view of its high oil content, it is particularly suitable for weatherproof exterior coatings.

Claims (6)

Claims: 1. A process for the production of oxidatively drying water-thinnable paint binders based on alkyd resin, which are particularly suitable for the formulation of air-drying or forced drying paints, characterized in that (A) 15 to 50% by weight of a polyester serving as a carrier resin with the general construction principle where R represents a radical of a tetravalent alcohol, preferably of pentaerythritol, the hydroxyl groups of which are partially with unsaturated oleic acids, optionally mixed with cyclic monocarboxylic acids (radicals R1) and with anhydrides of aromatic, cycloaliphatic or aliphatic dicarboxylic acid anhydrides (radicals R2) as well as with aromatic, cycloaliphatic or aliphatic dicarboxylic acids and / or diisocyanates (radicals X) are reacted and where R3 can be R1 or OH and n O - 3, the fatty acid content between 20 and 50%, the acid number between 50 and 100 mg KOH / g and the component contains at least 1 hydroxyl group per 1000 g, with (B) 50 to 85% by weight of a conventionally prepared, dissolved in organic solvents, preferably white spirit according to DIN 51 632, with 30 to 65 70 unsaturated oil-fatty acids modified alkyd resin, which has a hydroxyl number of 20-100 mg KOH / g and an acid number of has less than 10 mg KOH / g mixes or partially condenses at temperatures between 20 and 1600C without exceeding the limit of water solubility after neutralization and the binder obtained in this way by partial or complete neutralization of the carboxyl groups of the carrier resin with ammonia and / or amines converted into the water-dilutable form. 2. The method according to claim 1, characterized in that one in the Component 1 the unsaturated oil fatty acids up to 50 mol% by means of cyclic monocarboxylic acids replaced. 3. The method according to claims 1 and 2, characterized in that that vinyl-modified oil fatty acids are used to produce component (A) will. 4. The method according to claims 1 to 3, characterized in that that urethane-modified alkyd resins are used as component (B). 5. Process according to claims 1 to 4, characterized in that that the alkyd resins used as component (B) amino groups in an amount corresponding to contain an amine number of max. 25 mg KOH / g. 6. The method according to claims 1 to 5, characterized in that that components (A) and (B) consist essentially of the same or similar starting materials being constructed.