RU2393189C1 - Coating composition - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to compositions used as protective coating for wood, concrete, glass and metal. The composition contains the following in pts. wt: 30-70 polyoxypropylenetriol with molecular weight of 3000-5000, 65-70 polyisocyanate based on 4,4'-diphenylmethanediisocyanate, 0.1-0.2 tin dibutyldilaurate, 70-30 diphenylolpropane and 125 acetone as a solvent.

EFFECT: composition enables to increase hardness and strength of coatings, shorten hardening time of the composition and improve its environmental friendliness through reduction of amount of polyisocyanate used.

19 ex, 1 tbl

Description

The invention relates to compositions of film-forming polyurethane compositions and can be used as a protective coating for wood, concrete, glass, metal.

Known composition for coatings containing polyoxypropylene triol, a polyisocyanate based on 4,4'-diphenylmethanediisocyanate and ethyl acetate in the following ratio, wt.h .:

polyoxypropylene triol with a molecular weight of 3000-5000 one hundred 4,4'-diphenylmethanediisocyanate polyisocyanate 100-200 ethyl acetate 100-200

see RU Patent 2073053, IPC 6 C09D 175/08, 1997

The disadvantage of this composition is the long curing time of the composition and the insufficient strength properties of the coatings.

Closest to the invention in technical essence is a coating composition containing polyoxypropylene triol with a molecular weight of 3000-5000, a polyisocyanate based on 4,4'-diphenylmethane diisocyanate, tin dibutyl dilaurate, and as a solvent a mixture of ethyl acetate, butyl acetate and tributylamine, in the following ratio of components wt.h .:

polyoxypropylene triol with a molecular weight of 3000-5000 one hundred 4,4'-diphenylmethanediisocyanate polyisocyanate 100-200 tin dibutyl dilaurate 0.2-0.6 ethyl acetate 30-70 butyl acetate 30-70 tributylamine 0.1-0.3

see RU Patent 2162478, IPC 7 C09D 175/08, 2001

The disadvantage of this composition is the low hardness and strength of the coatings, the duration of curing of the composition and the high content of hazardous polyisocyanate in the composition.

The objective of the invention is to increase the hardness and strength of the coatings, reducing the curing time of the composition and improving its environmental friendliness by reducing the amount of input polyisocyanate.

The technical problem is solved in that the coating composition containing polyoxypropylene triol with a molecular weight of 3000-5000, a polyisocyanate based on 4,4'-diphenylmethanediisocyanate, tin dibutyl dilaurate and a solvent, it additionally contains diphenylol propane, and acetone is used as a solvent in the following ratio of components wt.h .:

polyoxypropylene triol with a molecular weight of 3000-5000 30-70 4,4'-diphenylmethanediisocyanate polyisocyanate 65-70 tin dibutyl dilaurate 0.1-0.2 diphenylolpropane 70-30 acetone 125

which makes it possible to increase the hardness and strength of coatings by 1.3–1.4 times, reduce the curing time of the composition by 1.5–2 times, and improve its environmental friendliness by reducing the amount of polyisocyanate introduced by 2.8–3 times.

Characteristics of the substances used in the composition:

- polyoxypropylene triol of the Laprol brand according to TU 6-05-1513-75, TU 6-05-2033-87, TU 6-55-62-93;

- a polyisocyanate based on 4,4'-diphenylmethanediisocyanate of the Surizon or Surizon P 85 trademark in accordance with TU 113-03-29-22-84;

- tin dibutyl dilaurate, see J.H. Saunders, K.K. Frisch "Chemistry of Polyurethanes", M., "Chemistry", 1968, p.211;

- diphenylolpropane according to TU 2423-172-00203335-2007;

- acetone according to GOST 2768-84 / 2.

The invention is illustrated by the following examples of specific performance:

Example 1 (prototype)

Components are loaded into the container in the following ratio, parts by weight:

polyoxypropylene triol with a molecular weight of 3000 one hundred 4,4'-diphenylmethanediisocyanate polyisocyanate 200 tin dibutyl dilaurate 0.2 ethyl acetate fifty butyl acetate fifty tributylamine 0.1

stirred for 2 hours and applied to the work surface.

Example 2 (according to the claimed object)

Composition for coatings obtained by mixing the components in the following ratio, parts by weight:

polyoxypropylene triol with a molecular weight of 3600 thirty 4,4'-diphenylmethanediisocyanate polyisocyanate 68 tin dibutyl dilaurate 0.2 diphenylolpropane 70 acetone 125

after mixing, the mixture is applied to the work surface.

Example 3

The composition is obtained analogously to example 2, but using polyoxypropylene triol with MM 3000.

Example 4

The composition is obtained analogously to example 2, but using polyoxypropylene triol with MM 5000.

Examples 5, 8

The composition is obtained analogously to example 2, but with a different ratio of polyoxypropylene triol and diphenylol propane.

Examples 6, 9

The composition is obtained analogously to example 3, but with a different ratio of polyoxypropylene triol and diphenylol propane.

Examples 7, 10

The composition is obtained analogously to example 4, but with a different ratio of polyoxypropylene triol and diphenylol propane.

The composition according to examples 11, 12, 13, 14, 15, 16, 17, 18, 19 is obtained similarly to examples 2, 3, 4, 5, 6, 7, 8, 9, respectively, when using 0.1 wt.h. tin dibutyl dilaurate.

The curing time of the composition is based on the ability of coatings to hold paper on their surface during curing, determined according to GOST 19003-73.

The tensile strength of the film is the maximum stress that the film can withstand without breaking, is determined according to GOST 18299-72.

The relative hardness of the coatings (in units) is determined by the pendulum device of the ME-3 brand according to GOST 5233-67.

The data on examples are given in the table.

As can be seen from examples of specific performance, the claimed composition allows to increase the hardness and strength of the coatings by 1.3-1.4 times, reduce the curing time of the composition by 1.5-2 times, and improve its environmental friendliness by reducing the amount of polyisocyanate introduced by 2.8-3 times.

Table The composition and properties of the composition Composition (parts by weight) and composition properties 1 (prototype) 2 3 four 5 6 7 8 9 10 Polyoxypropylene triol one hundred thirty thirty thirty fifty fifty fifty 70 70 70 Polyisocyanate 200 68 70 65 68 70 65 68 70 65 Ethyl acetate fifty Butyl acetate fifty Tin Dibutyl Dilaurate 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Tributylamine 0.1 Acetone 125 125 125 125 125 125 125 125 125 Diphenylolpropane 70 70 70 fifty fifty fifty thirty thirty thirty Curing time, h 1,5-2 one one one one one one one one one Hardness of coatings, unit 0.48 0.64 0.62 0.65 0.68 0.66 0.67 0.67 0.64 0.66 Film tensile strength, MPa 51 70 66 69 71 69 70 68 66 68

Table continuation eleven 12 13 fourteen fifteen 16 17 eighteen 19 thirty thirty thirty fifty fifty fifty 70 70 70 68 70 65 68 70 65 68 70 65 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 125 125 125 125 125 125 125 125 125 70 70 70 fifty fifty fifty thirty thirty thirty 1-1.5 1-1.5 1-1.5 1-1.5 1-1.5 1-1.5 1-1.5 1-1.5 1-1.5 0.63 0.62 0.65 0.67 0.65 0.65 0.65 0.63 0.64 68 66 67 70 67 69 67 66 68

Claims (1)

Composition for coatings containing polyoxypropylene triol with a molecular weight of 3000-5000, a polyisocyanate based on 4,4'-diphenylmethanediisocyanate, tin dibutyl dilaurate and a solvent, characterized in that it additionally contains diphenylol propane, and acetone in the following ratio, wt. hours:
polyoxypropylene triol with a molecular weight of 3000-5000 30-70 4,4'-diphenylmethanediisocyanate polyisocyanate 65-70 tin dibutyl dilaurate 0.1-0.2 diphenylolpropane 70-30 acetone 125