DD297433A5 - 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 and epoxy resins. To avoid premature gelation in the presence of more than 0.2 parts by weight in% water, the paints do not contain any pigments and extenders which have oxides or hydroxides of Mg, Ca, Sr, Ba, Zn, Cd and Al as direct constituents. They contain exclusively 3 to 60% by weight in% of untreated rutile-type TiO 2 with a maximum of 2% by weight of aluminum oxide hydrate. {Acrylic resin, heat-reactive, self-crosslinking; Combination paint; gelation; Water content; oxides; hydroxides; alkaline earths; Zinc; Cadmium; Aluminum; titanium dioxide; Rutile, untreated}

Description

The invention relates to acrylic resin combination paints based on heat-active 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 homo- or copolymers of acrylic or methacrylic acid, preferably of the acrylamide type, and their combinations 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 are state of the art. These combinations, in combination with 0.4 weight % water content and more, based on the paint formula, which can be incorporated by all paint formulation ingredients, have an 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 nature or 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 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 reduce the gelation tendency in the presence of 0.4 parts by weight in% and more water by suitable composition of the combination paints based on heat-reactive self-crosslinking acrylic resins.

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 Polymethacrylatharzün, amine resins or epoxy resins and mixtures thereof and solvents, excipients, pigments and extenders, in which 3 to 60 parts by weight in%, based be used on the paint formulation, exclusively not post-treated TiO 2 pigment having a rutile structure, which have at most 2 parts by mass in% of inorganic aluminum compounds (alumina hydrate), based on Τ1Ό2. In addition to this TiO ₂ pigment, all pigments or extenders are excluded which contain or consist of oxides or hydroxides of the elements Mg, Ca, Sr, Ba, Zn, Cd and Al or mixtures of the oxides and hydroxides as direct constituents.

Homopolymer or copolymers of acrylic acid or methacrylic acid, preferably of the acrylamide type, can be used as heat-active, self-crosslinking acrylic resins.

As combination resins are cellulose esters, such as. For example, 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-epichlorofhydrin 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 Ce aromatics.

As the pigments and extenders, especially iron oxide pigments, lead chromate pigments, common organic pigments and dyes, carbon blacks and selected kaolin and talcum species, silicic acid extender and barium sulfate extender are usable.

The paints according to the invention have a system stability of at least 6 months compared to the known formulations with a mass content of up to 2 parts by weight in%, based on the total recipe. Thus, the shelf life as well as the application and processing ability are increased to a time required in practice.

embodiments

example 1

11.0 acrylic resin solution, acrylamide type, 50% in xylene / n-butanol 12.0 cellulose nitrate, alcohol damp 4.0 ketone-formaldehyde resin 4.0 TiO ₂ , rutile structure, not post-treated 20.0 for a base and pre-spray paint, air-drying selected inorganic fillers (eg slate meal, kaolin, barite) and pigments

12.0 Talc (selected type) 0.5 Anti-settling agent 0.4 Wetting agent 5.0 Softener mixture

19.1 Ethyl vinyl acetate _1? 0

Example 2

for a presize paint, oven-drying 30.0 acrylic resin solution, type acrylamide, 50% in xylene / n-butanol 5.0 melamine resin solution, 50% in n-butanol 40.0 TiO ₂ , rutile structure, not post-treated 12.0 selected inorganic fillers (eg BaSO ₄ ), optionally also pigments 12.7 Solvent mixture 0.3 Additives 100.0

Example 3

for one enamel paint, air-drying 38.0 acrylic resin solution, acrylamide type, 50% in xylene / n-butanol 10.0 cellulose nitrate, alcohol dampness 13.0 TiO ₂ , rutile structure, not aftertreated 3.8 selected inorganic extenders, especially blanc fixe 0, 2 anti-settling agents 0.1 wetting agent

4.4 Softener mixture 21.0 EthylVButylacetat

8.5 Aromatic Mixture 1.0 Additives

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, not aftertreated 10.0 selected inorganic extenders (Β Blanc. Blanc fixe) 0.3 Anti-settling agent 0.3 Additives 21.0 Solvent mixture 100.0

Example 5

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 TiOj, anatase structure 20,0 usual fillers (for example, zinc white, lithopone, calcite), optionally also pigments 12.0 talc 0.5 0.4 wetting agent 5.0 antisettling plasticizer mixture EthylVButylacetat 19.4 12.0 aromatics 100.0

Examples

for a base color according to previously known solution 38.0 acrylic resin solution, type acrylamide, 50% in xylene / n-butanol 10.0 cellulose nitrate, alcohol wet 2.0 polymethacrylate resin solution, 40% in xylene 13.0 TiO], rutile structure, 93, 5 % TiO ₂ , aftertreated with inorganic Al and Si as well as organic compounds 3.8 usual extenders, ζ. Β. Zinc white, lithopone 0.2 Anti-settling agent 0.2 Wetting agent 4.5 Softener mixture 21.0 Ethyl / butyl acetate 8.3 Aromatic mixture 1.0 Additives 100.0

table

Comparison of the solution according to the invention with known paints with a water content of 1.1.5 and 2 parts by weight 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 7B-200 until gel. after 4 weeks storage time a 20-35 b 80-200 65-100 20-35 80-200 to gel. after 6 months storage time a 25-40 b100-240 70-120 gel. gel.

a = paint diluted 2: 1 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 (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 include TiO ₂ anatase type and of pigments and Extenders which have oxides or hydroxides of the elements Mg, Ca, Sr, Ba, Zn, Cd and Al or mixtures of the oxides and hydroxides as direct constituents, as TiO ₂ pigment 3 to 60 parts by mass in% untreated rutile TiO ₂ with a maximum of 2 parts by weight in% alumina hydrate, based on the amount of TiO ₂ contained. Field of application of the invention