CS233193B1 - Coating compositions on base of alkyd air-drying resins - Google Patents

Abstract

Coating bumps consist of alkyd a resin having a total of the amount of hydroxyl groups present in the starting reagents 10 to 10 35% free hydroxyl groups, 6 to 11% of the hydroxyl groups bound in the reaction with isocyanates and 50 to 85% hydroxyl ester-bound groups with carboxyl groups. Out of total the amount of bound polyhydric alcohols 15 to 65 wt. acyclic alcohols and 35 to 85 wt. polymeric alcohols that are being prepared by radical styrene copolymer with esters derived from acrylic acid or mothacrylic acid and acyclic poison of alcohol, with hydroxyesters derived from acid and acyclic divalent alcohols and optionally with acyclic unsaturations monocarboxylic acids. Coating compositions further comprise organic solvents, pigments and / or fillers, desiccants, additives and additives binders.

Description

FIELD OF THE INVENTION The present invention relates to coating compositions with extremely fast drying and overcoating properties.

Air-borne paints account for a significant proportion of the total amount of paints produced. A significant part of these are paints in which some type of oil alkyd is used as a binder. The properties of the resulting coatings are fundamentally influenced by the components used and their relative proportions.

A great advantage of alkyd paints is good drying and generally good mechanical properties. However, in some applications, further drying acceleration is required to speed up the ability to handle large items. · This is usually done by attribution, ie by exposing the coating to temperatures of 40 to 70 ° C, which requires installation of the equipment and also increases energy consumption »

Another problem arises when dried coatings are further overcoated or sprayed with paints from the content of oxygenated solvents and aromatics · Mostly surface defects occur, sometimes even degradation of the coatings.

The present invention is directed to alkyd resin based paints containing organic solvents and optionally desiccants, fillers, pigments, additives or additional binders.

233 193

The essence of the invention is that the coating compositions consist of 150 to 500 wt. parts of the modified alkyd resin having from the total amount of hydroxyl groups present in the starting reactants 10 to 35% of hydroxyl groups free, 6 to 11% of hydroxyl groups bound after reaction with isocyanates, in particular -NH-C00-, and 50 to 85% % of the ester-linked hydroxyl groups of the carboxyl groups, of which 15 to 65 wt. acyclic alcohols with 2 to 5 _{to 7} carbon atoms and 2 to 4 hydroxyl groups and from 35 to 85% by weight. polymeric alcohols prepared by the free-radical copolymerization of 1 mole of styrene with 0.35 to 1.70 moles of esters derived from acrylic or methacrylic acid and acyclic monovalent alcohols having a carbon number of 1 to 4 with 0.02 to 0.30 moles of hydroxy esters derived therefrom acids and acyclic divalent alcohols having a carbon number of 1 to 4 and optionally up to 0.1 moles of acyclic unsaturated monocarboxylic acids. acids having a number of carbon atoms of 13 to 22 and an iodine number of 120 to 200 g Jg / 100 g. parts of organic solvents selected from the group consisting of white spirit, xylene, ethyl or butyl acetate, butanol and isobutanol. They may also contain up to 650 wt. parts of pigments and / or fillers and up to 150 wt. parts of desiccants, additives and supplementary binders, in particular from the group comprising alkyds and copolymers containing vinyl and / or acrylate segments.

The coating compositions according to the invention are characterized by an extremely fast drying at all stages. This makes it possible to handle the coated objects very shortly after the application of the coatings. The coatings dry quickly without the addition of desiccants and have excellent adhesion and good mechanical properties. Coatings from primers without drying agents are resistant to solvents during drying and drying. This allows it to be painted or sprayed with ni3

233 193 with three-coat paints. The top coatings are characterized by good gloss retention and color shade, especially whiteness.

The alkyd resins used for the preparation of the coating compositions are characterized by the composition according to Examples A to P shown in Tab. 1. For these alkyds, polymeric alcohols prepared by the free-radical polymerization of monomers having the composition shown in Tab. 2. In Tab. 3, the iodine numbers of vegetable oils and the acyclic and monocarboxylic acids derived therefrom are used to prepare alkyd resins.

Known types of pigments and anticorrosive pigments, especially iron, titanium and lead oxides, as well as lithopone, zinc phosphate, zincktetraoxychromate, as well as special so-called core pigments and color pigments, including organic and others, are also used for the preparation of paints. As fillers, it is possible to use mainly blanc-fix, quartz, precipitated calcium carbonate, micronized limestone, kaolin, dolomite, chalk, quartz, slate, colloidal silicon dioxide, metallic copper powder, zinc, aluminum. As drying agents, salts of naphthenic acids, resin acids or octoates of cobalt, manganese, lead, calcium and other metals are used. Ketoximes, aldoximes, alkyl or arylphosphines are added to suppress skin formation.

The coating compositions of the above-mentioned components can be prepared on all known types of equipment, in particular on bead mills or sand mills. in

The coatings dry to degree 1 from 10 min. to 15 min. and up to degree 4 or 5 maximum 3 hours. Based on the evaluation results, the coatings according to the invention are particularly suitable for extremely fast drying primer coatings, but also for primer coatings and enamels used primarily for structures and metal equipment, as well as for coatings of other substrates, in particular wood.

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Tab. 1

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233 193

Composition of polymeric alcohols prepared by radical polymerization of these monomer mixtures (molar ratios)

Polymeric alcohol AND II III IV in Monomers: Styren 1 1 1 1 1 Ethyl acrylate - 0.650 M 0.230 1,060 Butyl acrylate - 0.100 0,036 0.140 0.120 Methyl methacrylate 1,040 0.530 0.380 0.690 0.360 2-hydroxyethylacry- lath -. - 0.020 0,060 - 2-hydroxyethylmetha- krylát 0,028 - - - - 2-hydroxypropyl- acrylate - 0.050 - 0.040 0.230 Acids of dehydrated castor oil 0,086 0.003 Linseed oil acids O* 0,046 - - -

Tab. 3 Iodine number of the vegetable oils and carboxylic acids used Component —1 iodine. No. g Jg.100 g LO 172.9 SO 129.5 KLO 161.4 KSO 124.7 KDRO 127.5

233 193

The meaning of the abbreviations of the components used in Tables 1 and 3 is as follows:

LO linseed oil SO soybean oil KLO of linseed oil KSO soybean oil KDRO dehydrated oil G glycerol P pentaerythritol NPG neopentylglycol EG ethylene glycol BYE phthalic anhydride THPA tetrahydrophthalic anhydride KB benzoic acid KptBUB p-tert-butylbenzoic acid KA adipic acid PA I and V polymeric alcohol I to V TDI 2,4-toluene diisocyanate IPDI i z o f o r ondi i zocyanate 1,6 HÍ.IDI 1,6-hexamethylenediisocyanate

233 193

The object of the invention is exemplified by the coating compositions for which the alkyd resins described in Table 1 to 3 have been used.

CSN 67 3052 CSN 67 3050 CSN 67 3061 CSN 67 3076

CSN 67 3079

CSN 67 3081

CSN 67 3085

Drying of paints

Preparation of test coatings

Measurement of coating thickness

Determination of hardness of coating film by pendulum apparatus

Determination of flexural resistance of paint film

Determination of Resistance of Coating Film by Digging in an Erichsen Machine Coating Adhesion ·

T ab .4

Some properties of the coating compositions of Examples 1 to 6

Property 1 2 Ex 3 lad 4 5 6 Drying grade 1 min , 10 15 Dec 13 10 13 10 Drying stage 4 »h 2 3 3 2 2 2 Pendulum hardness,% standard after 10 days 18 22nd 25 27 Mar: 18 22nd Grip, degree A1 A1 A1 A1 A1 A1 Digging resistance, mm 6.7 7.1 7.1 7.5 6.7 7.1 Bending resistance, mm 3 3 2 3 2 3

The properties of the coatings were evaluated after 3 days from the date of their preparation.

Example 1 233 193

Color anticorrosive paint for metal structures red ,, extremely fast drying Total Dry matter Dissolve- body Modified alkyd resin 380 190 190 Iron oxide red Slate micronized Talc Žluí zinková Aluminum stearate 220 230 80 50 3 Methylethylketoxin COnaphthate (xylene solution with Co as metal) 3 2 0.3 1.7 Xylene 32

Example 2 Paint base on metal construction gray, very fast drying Total Dry matter Dissolve- body Modified alkyd resin 400 200 200 Litopon 280 White zinc 50 žluí zinková 26 Talc 45 Micronised slate 147 Carbon black LTN 2 Xylene 50

Example 3 233 193 Color basic white fast drying Total dry matter Rcgpcuš 'tedlo Modified alkyd resin kyřxoe C 410 205 205 Litopon 390 White zinc 40 Talc ground 100 ALIGN! Aluminum stearate 3 Butylaldoxin 3 Xylene 94 Example 4 Synthetic undercoat paint very quickly Flowing khaki Total Dry Solvent Modified alkyd resin kyřice D 380 190 190 Litopon 180 White zinc S0 Black iron oxide 5 Yellow iron oxide 47 Micro-limestone limestone 140 Bláno fixe 120 Manganese naphthenate (2 0 Qty as metal) 8 0.8 7.2 Butylaldoxin 3 Xylene 57

Example 5 233 193

Color synthetic top, quick drying for agricultural machinery, green

Total Dry Solvent

Modified alkyd resin 360 180 180 Modified alkyd resin 240 120 120 Copolymer of vinyl chloride with vinyl acetate 70 18 52 Green chrome 125 White zinc 135 Cobalt naphthenate 1% Co as metal 3 0.5 2.5 Xylene 67

Example 6 Synthetic enamel very fast drying for industry, white Dissolve- body Total Dry matter Modified alkyd resin 688 344 344 Blanc-fixe White titanium rutile Methylethylketoxin Cobalt naphthenate (xylenes, 75 200 3 of of solution with 1% Co as metal ) 2 0.3 1.7 Xylene 32

Claims (1)

Alkyd resin based paints (further comprising organic solvents and, optionally, desiccants, fillers, pigments, additives or binder additives), characterized in that they consist of 150 parts by weight to 500 parts by weight of an alkyd resin having: of the total amount of hydroxyl groups present in the starting reactants 10 to 35% of hydroxyl groups free, 6 to 11% of hydroxyl groups bound after reaction with isocyanates, in particular -NH-COO-, and 50 to 85% of ester-linked hydroxyl groups with carboxyl groups wherein, of the total amount of polyhydric alcohols bound, 15 to 65% by weight of acyclic alcohols having 2 to 5 carbon atoms and 2 to 4 hydroxyl groups and 35 to 85% by weight of polymeric alcohols are prepared by radical copolymerization of 1 mole of styrene with 0.35 to 1.70 moles of esters derived from acrylic or methacrylic acid and acyclic monovalent and 0.02 to 0.30 moles of hydroxy esters derived from these acids and acyclic divalent alcohols having 1 to 4 carbon atoms and optionally up to 0.10 moles of acyclic unsaturated monocarboxylic acids having carbon numbers atoms 13 to 22 and iodine number 120 to 200 g Jg / 100 g, 150 to 600 wt. parts of organic solvents selected from the group consisting of white spirit, xylene, ethyl acetate, butyl acetate, butanol and isobutanol and optionally up to 650 wt. parts of pigments and / or fillers and up to 150 wt. parts of desiccants, additives and supplementary binders, in particular from the group comprising alkyds and copolymers comprising vinyl and / or acrylate segments.