DD297435A5 - COMBINATION ARTICLES BASED ON HEAT-ACTIVE SELF-NETWORKING ACRYLIC RESINS - Google Patents

Abstract

The invention relates to combination paints based on heat-reactive self-crosslinking acrylic resins with cellulose esters, ketone-formaldehyde resins, air-drying Polymethacrylatharzen, amine resins or epoxy resins. To avoid premature gelation in the presence of more than 0.2 parts by weight in% water, the paints do not contain anatase-type TiO 2 pigments and pigments and extenders containing the oxides or hydroxides of Mg, Ca, Sr, Ba, Zn or Cd as direct components respectively. They contain oxides and hydroxides of aluminum up to 1.5% by weight, based on the pigment / extender mixture, and additionally 0.3 to 2.0 parts by mass in% of alkyltin compounds. {Acrylic resins, heat-reactive, self-crosslinking; Combination paint; gelation; Water content; oxides; hydroxides; alkaline earths; Zinc; Cadmium; Aluminum; alkyltin}

Description

Field of application of the invention

The invention relates to acrylic resin combination paints based on heat-reactive self-crosslinking acrylic resins and other binders for base, pre-cast and paint colors for metallic, wood, wood-like and silicate substrates.

Characteristic of the known state of the art

Paints with heat-reactive self-crosslinking homopolymers or copolymers of acrylic or methacrylic acid, preferably of the acrylamide type, and combinations thereof with cellulose nitrate and / or ketone-formaldehyde resins and / or air-drying polymethacrylate resins and / or amine resins, preferably melamine / formaldehyde condensates, and optionally further binder components, such as epoxy resins, fillers, pigments and solvent mixtures belong to the state of the art.

These combinations, in conjunction with 0.4% by weight of water, and more, based on the paint formula, before all components of the paint formulation can be incorporated, exhibit increased susceptibility to irreversible gelation.

The gelation can occur during the entire manufacturing process as well as during the storage of the finished paint. The reaction rate is dependent on the structure of the acrylic resin, in particular its acid number and hydroxyl content and the polarity ratios in the solvent system. With increasing acid number and decreasing hydroxyl content of the acrylic resin and with increasing polarity of the solvent system, an increase in the gelation rate can be observed. The processability of the paint is usually limited to a period of a few hours up to 10 days.

Object of the invention

It is the object of the invention to eliminate the existing disadvantages of acrylic resin combination paints in system stability and to increase storage stability to at least 6 months.

Explanation of the essence of the invention

The object of the invention is to vermindorn by suitable composition of the combination paints based on heat-reactive self-crosslinking acrylic resins Gelierungsneigung in the presence of 0.4 parts by weight in% and more water significantly.

According to the invention, the object is achieved by combination paints based on heat-reactive self-crosslinking acrylic resins of the amide type with cellulose esters, ketone-formaldehyde resins, air-drying polymethacrylate resins, amine resins or epoxy resins, and mixtures of these and solvents, auxiliaries, pigments and extenders, at from 0.3 to 2, 0% by weight, based on the total recipe of the paint, in the binders soluble and compatible with these alkyltin compounds having 3 to 0C atoms in the alkyl radical are added. TiO ₂ pigments of the anatase type and pigments and extenders which contain oxides and hydroxides of Mg, Ca, Sr, Ba, Zn and Cd or mixtures of these oxides and hydroxides as direct constituents or consist of these and those which contain oxides or hydroxides of aluminum or mixtures thereof in amounts of up to 1.5% by weight, based on the particular pigment / extender mixture used.

The combination paints may contain oxides or hydroxides of aluminum in amounts of up to 5 parts by weight in% in the form of modifiers of aftertreated TiO ₂ pigment with rutile structure, based on this pigment.

As the alkyltin compounds, particularly useful are alkyltin mercaptides and maleate, wherein the alkyl group may be a propyl, butyl, pentyl, hexyl, heptyl or octyl group.

As heat-reactive self-crosslinking acrylic resins are homopolymers or copolymers of acrylic acid or methacrylic acid, preferably of the acrylamide type, can be used.

As combination resins are cellulose esters, such as. As cellulose nitrate or cellulose acetobutyrate, amine resins such as melamine-formaldehyde condensates, ketone resins such as cyclohexanone-formaldehyde condensates and used as epoxy resins, for example, dian-epichlorohydrin polyaddition products.

The solvents to be used are those customary in the paint industry, such. As ethanol, n-butanol, ethyl acetate and butyl ester and aromatics, preferably C ₈ aromatics.

Particularly useful as pigments and extenders are iron oxide pigments, lead chromate segments, common organic materials and dyes, carbon blacks and selected kaolin and talcum species, silica extenders and barium sulfate extenders.

Compared to the known formulations, the coating materials according to the invention have a system stability of at least 6 months in the case of a water content of up to 2% by weight, based on the overall recipe, of at least 6 months. Thus, the shelf life as well as the application and processing capability is increased to a time that is in practice high.

Ausföhrungsbeisplele

example 1

for a base and pre-paint, air-drying

11.0 acrylic resin solution, type acrylamide, 50% in xylene / n-butanol

12.0 cellulose nitrate, alcohol damp

4.0 ketone-formaldehyde resin

4.0 TiO ₂ , rutile structure, aftertreated with 5% alumina hydrate

20.0 selected inorganic fillers (eg slate meal, kaolin, barite) and possibly pigments

12.0 talc (selected type)

0.5 anti-settling agent

0.4 wetting agent

4.6 plasticizer mixture

19.0 ethyl / butyl acetate mixture

12.0 aromatic mixture

0.5 dibutyltin mercaptide 100.0

Example 2

for a presize paint, oven-drying 30.0 acrylic resin solution, type acrylamide, 50% in xylene / n-butanol melamine resin solution, 50% in n-butanol TiO ₂ , rutile structure, aftertreated with 7% inorganic Al and Si compounds selected inorganic fillers , eg BaSO ₄ , possibly also pigments solvent mixture additives

dibutyltin mercaptide

Example 3

for a paint, air-drying

38.0 acrylic resin solution, type acrylamide, 50% in xylene / n-butanol

10.0 cellulose nitrate, alcohol damp

13.0 TiO ;, rutile structure, aftertreated with 6% alumina hydrate and organic substances

3.8 selected inorganic fillers, e.g. B. Blanc fixe

0.2 anti-settling agents

0.1 wetting agent

4.0 plasticizer mixture

21.0 EthylVButylacetat-mixture

8.0 flavor mixture

1.0 additives

0.9 modified butyl tin maleate 100.0

Example 4

for one enamel paint, oven-drying 38.4 acrylic resin solution, type acrylamide, 50% in xylene / n-butanol

30.0 TiO ₂ , rutile structure, aftertreated with inorganic extenders selected with 5% alumina hydrate and organic substances, ζ. Β. Blanc fixe anti-settling additives

Solvent mixture dibutyltin mercaptide

Examples

11,0 acrylic resin solution, type acrylamide, 50% in xylene / n-butanol 12,0 cellulose nitrate, alcohol damp 4,0 ketone-formaldehyde resin 4,0 TiO ₂ , anatase structure 20,0 usual inorganic fillers (eg zinc white, lithopone, calcite), possibly also pigments

12.0 talc

0.5 anti-settling agent

0.4 wetting agent

5.0 plasticizer mixture

19.1 EthylVButyl acetate mixture 12.0 Aromatics mixture

Example 6

for a paint color according to previously known solution

13.0 acrylic resin solution, type acrylamide, 50% in xylene / n-butanol

10.0 cellulose nitrate, alcohol damp

2.0 polymethacrylate resin solution, 40% in xylene, air-drying

13.0 TiO ;, rutile structure, 93.5% TiOj, aftertreated with inorganic Al and Si and organic compounds

3.8 usual inorganic extenders, z. As zinc white, lithopone

0.2 anti-settling agents

0.2 wetting agent

4.5 plasticizer mixture

19.0 ethyl / butyl acetate mixture

8.3 aromatics mixture

1.0 Additives 100.0

table

Comparison of the invention with known paints at a water content of 1.1.5 and 2 parts by mass in%

Termination time TGL1443 (RGW) in [S] invention. Examples 1.3 2.4 Comparative Examples 5,6 immediately after production a 18-30 b 75-200 60-95 18-30 75-200 rare b. gel. after 1 week storage time a 18-30 b 75-200 60-95 18-30 75-200 to gel. after 4 weeks storage time a 20-35 b 80-220 65-110 20-35 80-200 to gel. after 6 months storage time a 25-40 b100-240 70-120 gel. gel.

a = Antrichstoff2: 1 diluted b = undiluted paint gel = gelled

A differentiation of the viscosity ratios results from the composition of the paints, the nature of the resin, the pigmentation, the water content and the temperature conditions.

Claims (3)

1. Combination paints based on heat-active self-crosslinking acrylic resins of the amide type with cellulose esters, ketone-formaldehyde resins, air-drying Polymethacrylatharzen, amine resins, epoxy resins or mixtures thereof and solvents, excipients, pigments and extenders, characterized in that they exclude anatase type TiO ₂ pigment and pigments and extenders, the oxides or hydroxides of the elements Mg, Ca, Sr, Ba, Zn and Cd or mixtures of these oxides and hydroxides as direct constituents and oxides or hydroxides of aluminum up to 1.5 mass%, based on the used pigment / extender mixture, additionally contain 0.3 to 2.0 parts by weight in%, based on the paint, in the binders soluble and compatible with these alkyltin compounds having 3 to 8C atoms in the alkyl radical. 2. combination paints according to claim 1, characterized in that they contain Alkylzinnmercaptide or Alkylzinnmaleinate with 3 to 8C atoms in the alkyl radical. 3. Combination paints according to claim 1, characterized in that they contain the oxides or hydroxides of aluminum up to 5 parts by mass in% as a modifier of post-treated ΤΊΟ2 with rutile structure.