DE870313C - Solvent in the manufacture of paints - Google Patents

Description

It is known to have solvents in the manufacture of paints the acetates have a very good dissolving power for many paint raw materials, especially for Nitrocellulose, however, prevents their use from the fact that they are physiologically not are flawless' because they are fast acting narcotics.

It has now been found that ß-Alkoxybutyraldehyddialkylacetale, their Alkyl groups are low molecular weight and expediently i to q. Contain carbon atoms, do not have these disadvantages and excellent solvents not only for nitrocellulose, but also for other paint binders such as cellulose ether, chlorinated rubber and! a large number of vinyl polymers, for example post-chlorinated polyvinyl chloride, Copolymers of vinyl chloride and vinyl ethers, polyvinyl acetate, polyacrylic acid esters or polyvinyl ether. Also fatty oils, oil-containing and oil-free alkyd resins, Rosin, maleic acid resins, cyclohexanone resins, coumarone and coumarone-indene resins are extremely easily formed by ß-alkoxybutyraldehyde dialkyl acetals of low viscosity solutions dissolved. But not only for these benzene-soluble resins The acetates mentioned have a good dissolving power, but also for fuel-soluble ones Resins such as Manilakopal, urea or phenol-formaldehyde resins. So you are the Solvents commonly used in the paint industry, such as esters and benzene hydrocarbons, Far superior in their dissolving power to spray-soluble resins, while on the other hand they are compared to the known alcohols and glycol ethers an increased solvency for Resins soluble in petrol and benzene.

ß-Alkoxybutyraldehyddialkylacetals, the z. B. by the addition of low molecular weight alcohols on crotonal'dehyde in the presence of acids as a catalyst can be obtained have only a faint odor. You can for yourself or in a mixture with other common solvents such as esters, glycol ethers, Alcohols ,. Benzene, gasoline or chorohydrocarbons can be used. .

The parts mentioned in the following examples are parts by weight: Example i 15 parts of an ester-soluble, medium-viscosity nitrocellulose with 3'5% fuel is moistened, 4 parts of cyclohexanol resin and 6 parts of di'butyl phthalate are in a mixture of 3o parts ß-Methoxybutyraldehyddimethylacetal, 40 parts Dissolved toluene and 5 parts of butanol.

This solution gives a solution that dries up clearly with good flow Paint that adheres particularly well to metal. She is after the addition of the usual Pigments e.g. B. ideally suited as a car paint.

Example2 18 parts of an ester-soluble, medium-viscosity nitrocellulose, which is moistened with 35% fuel, 3.5 parts of a fuel-soluble urea-formaldehyde condensation product, 4 parts of castor oil and 3 parts of the phthalic acid ester of glycol monomethyl ether will be in a mixture of 20 parts of ß-methoxybutyraldehyde di-methylaoetal, io parts. Sprit, 5 parts of butanol and 36.5 parts of toluene dissolved.

A clear lacquer which adheres very well to wood and which is obtained by spraying or brush can be applied.

Ex, ie13 15 parts of post-chlorinated polyvinyl chloride are Slight heating in 75 parts of ß-methoxy - butyraldehyddimethylacetal and dissolved 8 parts of chlorinated diphenyl and 2 parts of cyclohexanone resin were added to this solution. The paint obtained is pigmented with 15 parts of iron oxide red in the usual way.

A lacquer which adheres well to metal and which is also obtained is obtained repeated repainting does not detach from the substrate.

Example 4 20 parts of low-viscosity chlorinated rubber, 5 parts chlorinated diphenyl and 5 parts of thianthrene in 70 parts of ß-methoxybutyraldehyde dimethylacetal solved. The solution obtained is rubbed with 15 parts of red iron oxide.

An easily spreadable one that adheres well to metal and wood is obtained chemical resistant paint.

Claims (1)

PATENT CLAIM: Use of ß - alkoxybutyraldehyde - dialkyl acetals, the alkyl groups of which are of low molecular weight and expediently contain 1 to 4 carbon atoms, as solvents in the production of paints.