DE1246916B - Matting additive to coating agents - Google Patents

Description

GERMAN

PATENT OFFICE

EDITORIAL

German class: 22 g-10/01 ZZ { ₍ y

Number: 1246916

File number: P 31724 IV c / 22 g

Filing date: May 2, 1963

Opened on: August 10, 1967

I '' ■

There are many matting and opacifying agents in the art for paints, especially nitrocellulose paints, known, for. B. dewaxed shellac, synthetic wax, Naphthalene, zinc white, clay, kaolin, kieselguhr, talc, silica airgel, acetyl cellulose, Benzyl cellulose, chlorinated rubber.

It is also known to use fine crystalline polyethylene as a matting agent for matt lacquers. In order to achieve satisfactory results, however, relatively large amounts of this had to be used fine crystalline polymers are incorporated into the paint. In addition, the hardness and scratch resistance the lacquer coatings produced in this way leave something to be desired.

The object was therefore to find additives with a matting effect compared to the known ones Additions, special technical effects with regard to the physical properties that can be achieved in the paint coatings Enable properties.

According to the invention, polypropylene is used in finely divided form as an additive with a matting effect to optionally pigmented solvent-based or aqueous coating agents.

It was not foreseeable that the use of finely divided polypropylene according to the invention would continue Instead of the fine crystalline polyethylene a sudden improvement in the properties of the corresponding Paint coatings would bring with it. This improvement is particularly beneficial in that significantly smaller amounts of polypropylene are required to achieve the same matting effect than when incorporating finely crystalline polyethylene. Leave more than 40% polyolefin save comparatively. In addition, those made with finely divided polypropylene turned out to be Paint coatings as significantly more scratch and pressure resistant.

The tendency to soak up dirt on the surface of the paint is reduced; Their resistance to chalking, scratching and becoming matt on exposure can also be demonstrated raise. The painted surface can also be given a particularly aesthetic pattern effect. These benefits can be achieved without compromising flexibility, adhesive strength, or durability. The staining that occurs when roll-coated, post-deformable metal strips are wound up can also be avoided reduce.

For the invention, polypropylene of any origin can be used if its comminution up to desired particle size is possible. Particle size and particle size distribution in the invention matting effective additive to coating agents

Applicant:

E. I. du Pont de Nemours and Company,

Wilmington, Del. (V. St. A.)

Representative:

Dr.-Ing. A. v. Kreisler, Dr.-Ing. K. Schönwald,
Dr.-Ing. Th. Meyer and Dr. JF Fues,
Patent attorneys, Cologne, Deichmannhaus

Named as inventor:

Craig Whiting Larson, Lansing, Mich. (V. St. A.)

Claimed priority:

V. St. ν. America 11 February 1963 (257 744)

paint compositions according to the invention depends primarily on the formulation chosen and the area of application away. For general use, the finely divided polypropylene should have an average particle diameter up to about 35 microns and with a particle size distribution such that no particles greater than 75 microns in diameter are present. If you want special pattern effects, so the individual particles should have mean diameters of about 17 microns, while for unpatterned appearance the particles should have mean diameters below 17 microns. The lower limit for the particle size is determined by the degree of fineness to which the polypropylene brought; can be. To achieve satisfactory smoothness and quality of the paint coating is for For most areas of application, a partial height distribution that is as uniform as possible is desirable.

It is important that the polypropylene is in the paint of the invention maintains the size and shape of the particles. It can therefore be used in all paints incorporate that meet this requirement. No solvents are allowed in the masses are present, the polypropylene under the conditions chosen for use and storage in considerable Dissolve measure.

The new matting agent is particularly suitable for paints made from polymers and acrylic acid or Consist of methacrylic acid. However, alkyd- and melamine- or urea-formaldehyde-modified ones are also suitable Alkyd enamel paints, aqueous emulsion

709 620/539

paints, nitrocellulose paints, vinyl resin paints and oil paints.

The paints obtained with the coating compositions according to the invention are characterized by low Light reflection off. They are therefore particularly suitable for painting automotive instrument panels, because they reduce the glare effect of the windshield. Also for camouflage paints and for areas of application, where low surface reflection and high wear resistance are important, they have proven themselves very well. Examples: painting canvases, kitchen coatings, furniture coatings.

The amounts of polypropylene to be used depend of course on its particle size, the desired Degree of matting, the selected recipe, the substrate to be coated and similar factors away. It is therefore not possible to give an exact quantity that is valid for all purposes. Usually is polypropylene in amounts of 0.5 to 90%, in particular 5 to 65 · / », based on the total amount on existing solids, incorporated.

According to one embodiment of the invention, concentrations of 10 to 50% are chosen.

The grinding of the polypropylene particles to the desired particle size can be carried out in ball mills be made, after which the desired particle distribution is adjusted by sieving. In In special cases you have to add a surface-active agent to ensure proper wetting of the particles to ensure.

The paint compositions can be applied using methods customary in the paint industry, such as brushing on or spraying on or roller applied; special devices are not required.

The following examples illustrate the invention. The approaches were made using the usual Grinding and mixing technology manufactured; the polypropylene was added and the mixture up to Stirred formation of a uniform dispersion. Unless otherwise stated, all quantities are given to be regarded as weight specifications.

Methanol 1.50%

Ethylene glycol monoethyl ether acetate 2.83%

Butyl alcohol 6.31%

High-boiling aromatic solvent 5.45%

Polypropylene;

mean diameter: 7 microns 10.76%

This enamel was diluted to spray viscosity and sprayed onto sheet metal that was previously used for Apply a suitable primer or an equivalent treatment to ensure the adhesive strength had been subjected. The resulting film, up to 50 microns thick, was then left for 30 minutes dried in the oven at 132 ° C.

The paint showed extremely low surface reflectance. It is hard, scratch-resistant, and corrosion-resistant and flexible.

Example 2

Matt lacquer for automotive interiors
based on acrylic acid

Soot 2.11%

Cationically surface-treated assembly

morillonite earth 0.75%

Polymethyl methacrylate (corresponding to
U.S. Patent 2,934,509) with a
relative viscosity of 1.165 22.22%

Butyl benzyl phthalate 7.67%

2% silicone solution as leveling agent .. 0.24%

Acetone 12.03%

Xylene 21.72%

Toluene 23.33%

Ethylene glycol monoethyl ether acetate 2.76%

Polypropylene;

mean diameter: 7 microns 7.17%

example 1

Thermosetting enamel matt lacquer for automotive interior paints based on acrylic acid

Molybdenum orange

Maroon pigment

Porous silica airgel of light weight

weight

Thermosetting polymer
(a copolymer obtained from 30 parts of styrene, 30 parts of methyl methacrylate, 26 parts of lauryl methacrylate, 12 parts of hydroxyethyl methacrylate and 2 parts of methacrylic acid, which in a 5: 1 1-xylene-butanol solution at 55% solids a Gardner-Holdt-

Viscosity Z )

Alkyd resin modified with 43% soybean oil, butylated urea-formaldehyde resin Butylated melamine-formaldehyde resin

Xylene

High-boiling aromatic solvent (petrol-like, hydrogenated Petroleum distillate)

The paint was diluted to spray viscosity with suitable thinners and then applied A suitably pretreated automotive instrument panel is injected to make a 20 to 51 micron thick film emerged.

The paint can then be dried either in the air or in the oven for minutes at 149 ° C, after which there is a top coat that is characterized by low surface reflection and except for -1.50% which is hard and scratch-resistant.

9.30% 3.37% 55

20.19% 2.54% 1.25% 4.31% 7.37%

23.32% 60

Example 3

Aqueous emulsion of a matt lacquer
for interior painting

Magnesium silicate 2.29%

Titanium dioxide 3.79%

Finely ground, classified vermiculite .. 10.79%

Iron oxide yellow 0.43%

Carbon black 0.73%

Iron oxide red 0.30%

Acrylate resin emulsion as a binder
(Copolymer from the emulsion polymerization of 33 parts of methyl methacrylate and 67 parts of ethyl acrylate) 18.53%

Claims (1)

5 6 Methyl Cellulose 400OcP 4.33% thick of about 20 to 51 microns. This Ethylene glycol 0.45% ^ze 'gt slight surface reflection, feels fine Propylene glycol 009% has a frizzy appearance and has good scratch resistance. Man XT ». η ι Ι! \ '\ ^' r, r> «/ can be painted in the air or for 20 minutes Dry Natnum polycarboxylate 0.29% _{5 at a temperature of 149} o _c . Phenyl mercury oleate 0.04% Polyacrylic acid 0.05% claim: Water 49.12% Use of polypropylene in finely divided Polypropylene Form as a matting additive to counter mean diameter: 7 microns 8.50V. ¹⁰ tenenfelb pigmented solvent-based or aqueous coating agents. You can paint this paint by brushing it on or after dilution with water by means of publications. spray on appropriately prepared documents German Auslegeschrift No. 1 059 134; apply, for example on plaster, wood, metals 15 A. Kraus, Handbuch der Nitrocelluloselacke, or plastic, so that a paint with a film part 2.1952, p. 290 to 292. When the application was announced, three spray-on patterns were laid out. 709 620/539 7. «7 O Bundesdiuckerei Berlin