CS264853B1 - Painting composition on the base termoplastic polyacrylate,chelate and nitrocellulose - Google Patents

Abstract

The solution relates to paints in the air drying based on thermoplastic polyacrylate, chelate and nitrocellulose containing 5 to 40 parts by weight of thermoplastic acrylic resin of molecular weight 60,000 to 120,000, consisting of methacrylate and / or acrylate units and optionally free styrene units carboxyl groups in a concentration range acid numbers 15 to 40 mg KOH, below 2 to 40 parts by weight of nitrocellulose, 0.1 up to 2 parts by weight of chelate resin containing Al3 + and / or Ti4 + salts with acid α-acetic, maleic, benzoylacetone, acetoacetone and 30 to 90 parts by weight organic solvents with a content of at least 0.2 to 90 parts by weight Bronsted-Lowry base type, and optionally up to 10 parts additive additives and up to 30 parts of pigments and fillers.

Description

Air-drying paints based on thermoplastic polyacrylate, chelate and nitrocellulose are dilutable with organic solvents and dry quickly at temperatures up to 70 ° C, possibly under the influence of infrared radiation. The advantage of the solution is to achieve high mechanical and chemical resistance of the paint capable of fast curing even at elevated temperature.

Well-known nitrocellulose-based paints are characterized by a rapid drying. Their disadvantage is low resistance to chemicals, ultraviolet radiation, mechanical stress and low content of non-volatile components.

It is well known that chemical resistance can be increased somewhat by admixture of different types of chelate. The most frequently cited are chelates based on titanium and cheaper aluminum and chelating agents such as acetoacetonate, acetoacetate, malonate, benzoylacetonate, etc. groups (GB 1 210 966, Rumono G. J .: Am. Ink. Maker 60, 1982, No. 5). Paints based on thermo-plastic acrylate are characterized by good adhesion, fast drying, higher content of non-volatile components, high gloss. However, the thermoplastic character results in low surface hardness and also low chemical resistance. Another disadvantage is the relatively high price. A combination of nitrocellulose and thermoplastic acrylate is also known (US 3,594,338). It solves insufficient resistance to mechanical stress and high cost of paint. The question of chemical resistance remains unresolved.

These deficiencies are addressed by air-drying paints based on thermoplastic acrylate, chelate and nitrocellulose, characterized in that they comprise a thermoplastic acrylate resin having a molecular weight of 60,000 to 120,000, consisting of methacrylate, acrylate and optionally styrene groups containing free carboxyl groups the concentration of the acid number from 15 to 40 in an amount of 5-40 parts by weight, further 2 to 40 parts by weight of nitrocellulose containing free hydroxyl groups, from 0.1 to 2.0 chelate resin based on salts of Al + ^2, respectively. Ti ⁴⁺ with acetic acid, maleic acid, acetoacetone, benzoylacetone such as aluminum triacetacetonate, or titanium tetraacetoacetate and 30 to 90 parts of organic solvents such as ketones, alcohols, ethers, esters, aromatics containing 0.2 to 90 parts by weight Bronsted-Lowry type bases such as ethanediol dimethyl ether, tetrahydrofuran, acetoacetates, etc., optionally up to 15 parts of additive additives such as: dibutyl phthalate, dioctyl phthalate, silicone oil and others and up to 30 parts pigments and fillers such as titanium dioxide, phthalocyanine dyes, chromium yellow, carbon black, barium sulphate, limestone, kaolin, and the like. Throughout the text, is meant hundredths of a weight per unit of the resulting coating composition.

The present invention is directed to the use of a controlled crosslinking reaction between the free carboxyl groups of the acrylate resin, the hydroxy groups of nitrocellulose and the chelate resin according to the following scheme in the formulation of paints

OR, .C-OH + Al / \

STEED,

STEED,

STEED,

CH, OH + Al - ^»2 / \ r ₂ 0 ₃ or

OR «/ ²

CH ₂ -O-Al + R 3 OH

OR, CH ₂ -O-Al / ^OR 2

OR, + HO-C ► -► C-O-A1-OC + R 10 OH

STEED,

ORatd.

.C-O-Al-O-CH (air humidity,

OH

AND

C-O-Al-O-C + R 10 OH

OH

AND

CH2-O-Al-O-C

Δ

-h ₂ 0

C-O-Al-O-C

I o

C-O-Al-O-C etc.

In the liquid state in a closed vessel, the reaction is inhibited by the basic components of the solvent. The following examples of formulation formulations illustrate the specific application of the solution:

Example 1: Transparent lacquer

1. Acrylic resin 40 wt. d. 2. Nitrocellulose 2 wt. d. 3. Dioctyl phthalate 5 wt. d. 4. 50% solution of a chelated resin based on aluminum triacetoacetate in xylene 1.5 wt. d. 5. Ethylacetoacetate 10 wt. d. 6. Butyl acetate 38,5 wt. d. 7. Silicone oil 3 wt. d.

Example 2: Basic abrasive varnish

1. Acrylic resin 5 wt. d 2, Nitrocellulose 40 wt. d 3. Dibutyl phthalate 3 wt. d 4. Zinc stearate 7 wt. d 5. 50% solution of titanium tetraacetoacetonate chelate resin in xylene 0.5 wt. d 6. Ethylacetoacetate 5 wt. d 7. Ethyl acetate 5 wt. d 8. Silicone oil 0.5 wt. d

Example 3: White email

1. Acrylic resin 15 Dec hm. d 2. TiCl4-based pigment 20 May hm. d 3. 50% aluminum triacetoacetate solution in xylene 2,0 hm. d 4. Nitrocellulose 5 hm. d 5. Ethylacetoacetate 10 hm. d 6. Ethyl acetate 48 hm. d

Example 4: Impregnating varnish

1. Acrylic resin 5 wt. d 2. Nitrocellulose 2 wt. d 3. Aluminum triacetoacetate 0.1 wt. d 4. Tetrahydrofuran 0,9 wt. d 5. Xylene 30 wt. d 6. Butyl acetate 62 wt. d

All of the ingredients are mixed, homogenized and the insoluble ingredients dispersed by conventional techniques, e.g., in a pearl friction machine.

While maintaining the composition of the coating compositions within the scope of the present invention, it is possible to prepare coating compositions of various kinds - sealants, fillers, primers and primers, lacquers and enamels for indoor and outdoor use. They can be applied to metal, wood, plastic substrates. All coatings can be cured at normal and elevated temperatures (up to 70 ° C) and by infrared radiation. They can replace nitrocellulose paints as well as thermoplastic acrylate based paints and combinations thereof with the advantage of improved mechanical and chemical resistance of the coatings - especially aliphatic solvent resistance, hardness and flexibility and resistance to elevated temperatures. They can also replace synthetic paints with the advantage of faster drying and higher surface hardness. They can replace acid-curable paints and the benefits of faster drying and higher surface hardness and easier processing, as they are one-component paints. They do not contain free toxic monomers such as free formaldehyde or aggressive compounds such as acid catalysts.

Claims (1)

Air-drying paints based on thermoplastic polyacrylate, chelate and nitrocellulose, characterized in that they contain 5 to 40 parts by weight of a thermoplastic acrylate resin having a molecular weight of 60,000 to 120,000, consisting of methacrylate, acrylate and optionally styrene units containing free carboxylic acids 2 to 40 parts by weight of nitrocellulose, 0.1 to 2 parts by weight of a chelate resin consisting of salts of tetravalent titanium and / or trivalent aluminum ion with acetoacetic acid, maleic acid, benzylacetone acetone, acetone, 30 to 90 parts by weight of organic diluents containing 0.2 to 90 parts by weight of Bronsted-Lowry type bases, and optionally up to 10 parts of additive additives and up to 30 parts by weight of pigments and fillers.