RU2155785C1 - Atmosphere-resistant varnished composition - Google Patents

Abstract

FIELD: preparation of paintwork materials, more particularly polystyrene-based film-forming agent, protection of exterior, metallic, concrete and wooden surfaces from atmospheric corrosion in various industries. SUBSTANCE: described is atmosphere-resistant varnished composition comprising film-forming agent based on 20% polystyrene solution in solvent, plasticizer, pigments and modifying additive. Plasticizer is alph-methylstyrene dimer: pigment-modifying additive is carbamide-formaldehyde powder with particle size of up to 20 mcm and oil capacity of up to 90 g/100 g, ratios of component being as follows: film-forming agent based on 20% polystyrene solution in solvent, 79.5; pigment-modifying additive which is carbide-formaldehyde powder, 4.5-7.5; alpha- methylstyrene dimer plasticizer, 5.5; and pigments, the balance. EFFECT: improved coating by to addition of certain amount of carbide-formaldehyde polymer which improves protective properties of the coating on metallic, wooden and concrete surfaces, reduced amount of pigment used, and wider range of light colors.

Description

 The invention relates to the field of production of paints and varnishes, in particular paints based on polystyrene film-forming, can be used to protect external metal, concrete, wooden surfaces from atmospheric corrosion in various industries.

 A known composition for the protective coating of metal products, including organic compounds as a film former: polystyrene or non-toxic copolymers based on styrene with butadiene and / or acrylonitrile, fillers - inorganic additives, solvents - toluene, solvent and xylene or their mixtures of arbitrary composition in the following ratio of functional components, wt.%: film former 6-16, filler 6-14, solvent 70-88. [1. Patent of Ukraine N 23484A, IPC C 09 D 109/06, 5/08, publ. 08/31/98, BI N4].

 A known composition for producing paints and varnishes, in which polystyrene solvents are toluene, solvent, xylene, plasticizer is coal tar, dibutyl phthalate, dioxyl phthalate, chloroparaffin, sovol, castor oil or mixtures thereof. Known pigments are used to obtain a color gamut: titanium dioxide, chromium oxide, iron red minium, Prussian blue. Water resistance and hiding power is increased by the introduction of a spent oxide-zinc catalyst with a fineness of 50 microns. [2. RF patent N 2017781, MKI C09D191 / 00, publ. 08/15/94, BI N15 - 3. Patent of Ukraine N19264, publ. 12/25/97, PV N 6].

Known anticorrosive polystyrene composition, including in mass parts: polystyrene waste 15-16, coal tar 3.5-4.9, zinc powder 15-16, aluminum oxide 7-8, toluene 54.5-60.0. To increase the durability of the metal equipment of mines and non-ferrous metallurgy enterprises in aggressive environments, in particular 25% hydrochloric acid vapor at 60 ^o C, an organic corrosion inhibitor is introduced in an amount of 0.016-0.02. [4. Patent of Ukraine N3394, IPC C 09 D 125/06, 5/08, publ. 12/27/94, BI N6-1].

 Known coatings and compositions have insufficient weather resistance on wooden and concrete surfaces; to obtain protective coatings with the required hiding power, the consumption of pigments is increased; the presence of coal tar increases atmospheric toxicity and dark colors.

 The closest in technical essence and the achieved effect is the composition of an anticorrosive coating based on polystyrene, where toluene is used as a solvent, zinc dust is used as a pigment, in which coal tar is introduced to increase the protective properties and weather resistance. [5. Patent of Ukraine N5003, MKI C 09 D 3/733, C 09 D 5/08, publ. 08/23/94; PV N31 - 6. A.S.SSSSR N 1523563, MKI C 09 J 3/12, Pub. 11.23.89, BI N43 - prototype].

 The disadvantage of this composition is the insufficient weather resistance of the coating, the high consumption of pigment in obtaining coatings with the required hiding power and the inability to obtain light tones of the paint due to the dark color of coal tar.

 The basis of the invention of the weather-resistant paint composition is the task of improving the coating by introducing as a modifier and filler a certain amount of urea-formaldehyde polymer, which provides increased protective properties of the coating on both metal and wooden and concrete surfaces, reduces pigment consumption and widens the range of colors due to light tones.

The problem is solved due to the fact that the composition for a weather-resistant paint composition, including pigments, a plasticizer and a film-forming agent based on a 20% polystyrene solution, according to the invention, contains an alpha-methylstyrene dimer as a plasticizer, and is additionally introduced as a modifying additive and pigment KPP powder urea-formaldehyde polymer with a particle size of up to 20 microns and oil absorption of up to 90 g / 100 g, with the following ratio of components, wt%:
Film-forming based on a 20% solution of polystyrene in a solvent - 79.5
Pigment-modifying additive - urea-formaldehyde polymer of the KFP powder brand - 4.5-7.5
Plasticizer - alpha-methylothyrene dimer - 5.5
Pigments - The rest.

The urea-formaldehyde polymer of the KFP powder grade is obtained by reacting a urea-formaldehyde concentrate (20-24% urea and 54-60% formaldehyde) in an aqueous medium in the presence of an acid catalyst at a temperature of 80 ^o C, neutralizing the resulting suspension with chalk or another alkaline reagent, filtering and drying the precipitate. This product is produced according to TU-05761 6143.021-99 or TU 3.01 of Ukraine 013-93 or according to STP 51-98 "Urea-formaldehyde polymer".

 Improving the weather resistance, expanding the range of colors, reducing pigment consumption while improving the physical and mechanical properties of the proposed protective paint composition ensures the introduction of the urea-formaldehyde polymer KFP powder with a particle size of up to 20 microns and oil absorption up to 90 g / 100 g within the claimed limits.

The order of preparation of the composition is as follows. Polystyrene and an appropriate amount of solvent are loaded into a container with a stirrer to obtain a 20% polystyrene solution. The contents are mixed until the polystyrene is completely dissolved. The urea-formaldehyde polymer and plasticizer are added to the resulting solution, mixed until a homogeneous mass is obtained. Then the mixture is reloaded into a ball mill or paint grinder, pigment (s) is added and the desired degree of milling is achieved (TU113-03-27-89-91). The resulting composition is applied to the metal, concrete and wooden surfaces of test specimens, dried at a temperature of 18-23 ^o C and tested for weather resistance according to GOST 6992 (art. SEV 1767-79). Coatings are paint and varnish. Test method for resistance to atmospheric conditions. Decorative and protective characteristics after testing samples in atmospheric conditions are determined according to GOST 9.407-84 (Art. CMEA 5731-86). Coatings are paint and varnish. Appearance Assessment Method. The film hardness is determined using the MI-3 pendulum device according to GOST 6883. The adhesion is determined by the method of trellised notches according to GOST 15140. The film bending is determined according to GOST 6806. The film strength upon impact is determined on a U-1A device according to GOST 4765. The viscosity is determined on a B3 viscometer. -4 according to GOST 8420. Hiding power is determined by the method of a glass plate according to GOST 8784.

Table 1 shows the formulations of the paint compositions according to the invention (examples 1-9, of which 1, 4, 7 with zinc oxide, 2, 5, 8 with titanium dioxide, 3, 6, 9 with zinc dust), exorbitant values (examples 10 -15 and 19-20, including 10.13 with ZnO, 11, 14, 19, 20 with TiO ₂ , 12, 15 with zinc dust), prototype (examples 16-18), control (examples 21- 22); table 2 - the properties of the coatings of these compositions.

 According to tables 1-2, the new composition (examples 1-9), compared with the prototype (examples 16-18), provides improved weather resistance by decorative and protective indicators from 2 to 1 point, pigment consumption is reduced by 38-53%, appears possibility of release and light colors of weather-resistant paint. A decrease in the amount of KFP powder below the proposed ratio (examples 10-12) leads to a deterioration of decorative indicators to 2 points, an increase in the number of KFP powder above the proposed ratio (pr. 13-15) affects the viscosity, hardness and adhesion of the film. The use of CFP powder with a particle size of more than 20 μm (example 19) leads to the appearance of visible grains on the surface of the coating, which impairs its decorative properties. KFP powder with an oil absorption of up to 100 g / 100 g (example 20) reduces the hardness of the coating film to 0.22 srvc Replacing the plasticizer in the prototype (Example 21K) improves viscosity, facilitates application of the composition, reduces toxicity, but does not affect the protective properties and color gamut. Adding the proposed modifier-filler to the known composition (example 22k) does not give high results within the claimed limits.

Claims (1)

Weather-resistant paint composition, including film-forming on the basis of a 20% solution of polystyrene in a solvent, a plasticizer, pigments and a modifying additive, characterized in that it contains an alpha-methylstyrene dimer as a plasticizer, and a urea-formaldehyde polymer of the KFP-brand as a pigment-modifying additive powder with particle sizes up to 20 microns and oil absorption up to 90 g / 100 in the following ratio of components, wt.%:
Film-forming based on a 20% solution of polystyrene in a solvent - 79.5
Pigment-modifying additive - urea-formaldehyde polymer of the KFP powder grade - 4.5 - 7.5
Plasticizer - alpha-methylstyrene dimer - 5.5
Pigments - Else

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