RU2241725C1 - Water-dispersed paint - Google Patents

Abstract

FIELD: varnish-and-paint industry.

SUBSTANCE: paint contains film-forming agent: styrene/acrylic acid ester copolymer or styrene/acrylic acid copolymer; thickener: rarely cross-linked copolymer of butyl acrylate, methacrylic acid, and styrene or methylol methacrylamide, titanium dioxide, chalk and/or talc, and oxyethylated alkylphenol; foam suppressor; preservative; antifreeze; water and, additionally, coalescent agent: butyldiglycol acetate or flotation reagent: oxale; optical bleacher; triazineaminostilbene compound; and optionally composition of direct dyes belonging to blue, green, and red optical regions taken at ratio 1:(0.25-0.5):(0.005-0.1) and giving together white summary color. All components are used in specified proportions. Paint is characterized by whiteness 93-95% and resistance to static action of water and 3% alkali solution.

EFFECT: improved physico-mechanical characteristics.

3 cl, 2 tbl, 12 ex

Description

The invention relates to paints and varnishes, in particular to aqueous dispersion paints based on acrylic latexes.

It is known that on the basis of pure acrylates and their copolymers practically universal water-dispersion paints (VDKs) can be prepared, which are used for interior and exterior painting of buildings and structures on brick, concrete, plaster, wood and other surfaces. At the same time, when painting facades, VDK imposes increased requirements in terms of weather resistance and light resistance, for interior paints such indicators as resistance to washing, whiteness (especially for ceilings) are important.

Paints with high whiteness are prepared by selecting the main components of the appropriate quality: film-forming, pigments, fillers, or to add blue pigments to mask the yellowish and reddish shades.

So, in the patent of the Russian Federation 2167175, cl. S 09 D 133/04, publ. 2001, describes a water-dispersion paint containing, wt.%:

Film-forming styrene acrylate dispersion 8-20

or

Polyvinyl Acetate Acid Modified Versatic Acid 30-55

and additionally

Urea-formaldehyde polymer in the form of a dispersion 12-45

and / or pastes 30-35

Pigment - titanium dioxide 8-18

Filler - natural enriched chalk 10-25

Thickener - high viscosity hydroxymethyl cellulose or sodium carboxymethyl cellulose 0.3-1.0

Anti-foaming agent 0.2-0.5,

Water Else

The paint reaches high whiteness, light and weather resistance due to the use of complex film-forming, whose components are not produced in Russia.

Known water-dispersion composition for coating (RF patent 2168529, class C 09 D 133/04, publ. 2001), containing, wt.%:

Water emulsion of acrylic copolymer 48-48,2

Titanium dioxide 19.86-19.90

Talcum powder 6.8-7.2

Sodium CMC 0.19-0.21

Alkylphenol Polyoxyethylene Ether 0.02-0.03

Sodium Polyphosphate 0.10-0.11

Diethylene glycol 1.76-1.79

Tributyl Phosphate 0.28-0.3

Polyvinyl alcohol 0.41-0.42

Ammonia (25% aqueous solution) 0.50-0.51

Microcrystalline cellulose (10-100 microns) 6.8-7.2

Tiuram D 0.19-0.20

Water Else

This composition has good physical and mechanical properties (weather resistance, coating strength). However, the use of talc and microcrystalline cellulose as fillers does not make it possible to obtain an increased whiteness coating (which was not the object of this invention).

Known water-dispersion paint (RF patent 2069223, CL 09 D 133/12, publ. 1996), containing, wt.%:

Dispersion of a Methyl Acrylate Copolymer, 25-35

butyl acrylate and methacrylic acid

Filler (chalk, talc, kaolin) 30-35

Pigment (titanium dioxide, ultramarine,

yellow iron oxide pigment) 5-10

Fungicide (thiuram D, Na pentachlorophenolate) 0.2-0.4

Emulsifier (OP-7, OP-10, sulfanol) 0.1-0.5

Antifoam (silicone fluid) 0.1-0.2

dispersant (sodium tripolyphosphate,

sodium hexametaphosphate) 1.0-1.5

Thickener (styromal, hydroxymethyl cellulose) 0.3-0.6

Aqueous solution of ammonia 0.1-0.3

White Spirit (Coalescent) 1.2-3.0

Sodium Decahydroborate 0.005-0.01

Water Else

The paint is characterized by high water resistance, weather resistance, frost resistance, hardness. However, the use of ultramarine as a bleach, which, strictly speaking, is not bleach, but only masks the yellow tint, is ineffective, and over time the coating acquires a grayish color.

The closest in composition is a water-dispersion composition (RF patent 2188218, CL 09 D 5/02, publ. 2002), containing, wt.%:

Aqueous anionic dispersion based on an ester of acrylic acid, styrene and a carboxyl-containing monomer or a 50% unplasticized polymer dispersion of a copolymer of n-butyl acrylate 6.0-50.0

Pigment (titanium dioxide, yellow iron oxide pigment, red iron oxide pigment, chromium oxide, blue phthalocyanine pigment) 3-29

Mineral filler (micromarble, microcalcite, microbarite, microtalc, kaolin) 15-50

Cellulose thickener 0.1-0.3

Polyphosphate or sodium hexametaphosphate 0.95-5.0

Thiuram D (tetramethylthiuram disulfide) 0.1-0.25

Turpentine 0.3-1.5

Ethylene glycol or diethylene glycol,

or propylene glycol 2.5-6.5

Aqueous solution of ammonia 25% 0.1-0.5

Alkylphenol Polyoxyethylene Ether

or sulfanol or sodium alkanesulfonate 0.02-0.2

Ethyl cellosolve or butyl cellosolve, or complex

ether alcohol 2,2,4-trimethyl-1,3-

pentadiol monoisobutyrate) 1-4.0

Butyldiglycol 0.1-4.0

Thickener (acrylic or acrylurethane) 0.1-1.0

Aerosil 0.1-0.3

Water Else

The proposed composition has high physico-mechanical characteristics, good rheological properties, environmentally friendly. However, the whiteness and durability of the coating are determined only by the pigments, fillers and binders included in the formulation.

A technique is also known in the art for treating a pigment — titanium dioxide — with fluorescent dyes, optical brighteners or blue pigments (manganese violet, ultramarine) to eliminate yellowness, but the brightness is also reduced. In addition, an additional time-consuming stage complicates the technology and increases costs.

In the patent of the People's Republic of China 1106046, cl. From 09 V 129/0, publ. 1995, the proposed coating for the walls of the composition, parts by weight:

Slaked lime 130-150

Polyvinyl alcohol 6

Hydrochloric acid 0.2

Formaldehyde 0.5

Sodium hydroxide 0.4

Dibutyl phthalate 0.3

Polyamide 3-5

Sodium hexametaphosphate 0.3

Optical brightener 0.15

Ultramarine 0.1-0.15

Water 100

In this invention, an optical brightener in combination with a blue pigment is introduced directly into the coating composition, but the mixing of these components in the specified ratio does not allow to obtain a white color. At the same time, lime and alkali contained in the coating composition impose great restrictions on the choice of pigments (color gamut), since only alkali-resistant pigments can be used.

The objective of the invention is the creation of a water-dispersed matte paint with high physico-chemical and performance properties, in particular high whiteness, light, water and alkali resistance, an additional task is to improve the whiteness.

This goal is achieved in that the water-dispersion paint containing film-forming, titanium dioxide, chalk and / or talc, hydroxyethylated alkyl phenol, dispersant - hexametaphosphate or sodium polyphosphate, antifoam, preservative, ammonia (25% aqueous solution), antifreeze , thickener and water, according to the invention, as a film-forming agent contains a copolymer of styrene and esters of acrylic acid or styrene and acrylic acid, as a thickener, a rare crosslinked copolymer of butyl acrylate, methacrylic acid and styrene or methyl lmetacrylamide and additionally contains coalescent butyl diglycol acetate or flotation reagent oxal, an optical brightener of the triazinaminostilbene series and optionally a composition of direct dyes of blue, green and red colors, giving in a mass ratio of 1: 0.25-0.5: 0.005-0.01 in the sum is white, in the following ratio of components, wt.%:

Copolymer of styrene and acrylic esters

or styrene and acrylic acid 20-35

Rare crosslinked copolymer of butyl acrylate, methacrylic

acid and styrene or methylol methacrylamide 1-4

Titanium dioxide 15-30

Chalk and / or talcum powder 20-35

Butyldiglycol acetate or flotenagent oxal 0.7-1.2

Oxyethylated alkyl phenol 0.1-0.15

Hexametaphosphate or sodium polyphosphate 0.3

Antifoam 0.03-0.25

Preservative 0.1-0.3

Antifreeze 1.0-1.5

Ammonia (25% aqueous solution) 0.4

Optical brightener 0.05-0.8

The specified composition of the dyes 0-0,0012

Water Else

The water-dispersion paint according to the invention preferably contains 4,4'-bis- (4 '' - anilino-6 '' - morpholinotriazin-2 '' - amlamino) -2,2'-stilbendisulfonic acid, disodium salt - Belofor as an optical brightener KD-2 - or 4,4'-bis- [4 '' - diethanolamino- (p-sulfoanilino) triazin-2 '' - ilamino] -2,2'-stilbenditsilfokislotu, sodium salt - Belofor OB.

The following colorants can be used to prepare the dye composition: direct turquoise CB (C.I. Direct Blue 86), direct green CB (C.I. Direct Green 26) and direct scarlet (C.I. Direct Red 23) as blue, green, and red colors, respectively.

The proposed water-dispersion paint provides coatings of higher whiteness compared to the prototype. The inclusion in its composition of the composition of the dyes of blue gamut, green gamut and red gamma in the proposed ratio, which gives a total of white, can improve the shade of whiteness of the paint. The use of an integrated film-forming-thickener-pigment-filler system in the claimed component ratio provides increased resistance to the static action of water and alkali. The formulation is selected in such a way that the paint also has a higher light fastness. Thus, the new composition of the components gives the paint new properties.

Characteristics of the materials used.

As the film-forming in the composition, an aqueous emulsion of styrene-butyl acrylate-acrylic acid copolymer “Emulsion 252” (TU 22-41-078-05800142 m. A) or a dispersion based on styrene and acrylic acid esters without plasticizer, “Novopol-110” is used ”Or“ Novopol-001 ”.

As a thickener, a rare crosslinked copolymer of butyl acrylate, methacrylic acid and styrene or methylol methacrylamide is used — Plastitex SD (STP 08-6006) or Plastitex 2MD (STP 08-606).

As a pigment, titanium dioxide according to GOST 9808 or imported can be used.

Fine filler chalk M-5 (TU 5743-010-00186803), microtalc according to TU 5727-001-43439345 or imported is used as fillers.

Sodium polyphosphate according to GOST 20291 or sodium hexametaphosphate is used as a dispersant.

Tributyl phosphate (TU 6-02-733) or a mixture of aliphatic hydrocarbons and emulsifiers “Foamaster NXZ” (Cognis-Henkel) or BIK-037 (BYK-Chemie) can be used as a defoamer.

The emulsifier used is ethoxylated alkyl phenol OP-7 or OP-10 according to GOST 8433.

The flotation reagent oxal (TU 38.103429) or butyl glycol acetate (Union Carbide) is used as a coalescent.

As a preservative, thiuram D (GOST 740) or a broad-spectrum antiseptic “Mergal K9N”, which is a composition of 5-chloro-N-methylisothiazolinone and N-methylisothiazolinone (Troy Chemical), is used.

Ethylene glycol according to GOST 197110 supreme is used as antifreeze. grade.

As an optical brightener, “Belofor KD-2” (TU 6-14-423) or “Belofor OB liquid” (TU 6-38-05800142-728) is used.

The dyes used are Direct Turquoise CB (C.I. Direct Blue 86), Direct Green CB (C.I. Direct Green 26) and Direct Scarlet (C.I. Direct Red 23).

The water used is chemical desalinated (TU 6-00-05011907-110) or drinking (GOST 2874).

The proposed composition is prepared as follows.

The preparation of the pigment paste is carried out in a mixer with an anchor mixer. The prescription amount of water and alternately target additives are loaded into the mixer: emulsifier, antifoam, coalescent, dispersant, preservative. Then, with the stirrer working, add optical brightener and a dye composition, continue stirring for another 15 minutes, after which the pigment and filler are loaded in portions in 2-3 doses at intervals of 5-10 minutes. Dispersion of the pigment paste is carried out in the same mixer for 30-40 minutes.

An acrylic film former is loaded into the obtained pigment paste, mixed for 30 minutes until homogeneous, then an acrylic thickener is added and, after 15 minutes stirring, an ammonia solution, stirring is continued for another 30 minutes until homogeneous, after which the paint is checked for compliance with regulatory requirements. In case of discrepancy in terms of “viscosity” and “pH of the medium” is adjusted by water and ammonia solution.

Determination of the properties of water-dispersion paint is carried out according to standard methods:

- conditional viscosity is determined according to GOST 21903,

- degree of milling - according to GOST 6589,

- mass fraction of non-volatile - according to GOST 17537,

- adhesion - according to GOST 15140,

- film resistance to static action of liquids - according to GOST 9.403,

- whiteness - according to GOST 16873 (instrumental method for determining color and whiteness),

- conditional light resistance - according to GOST 21903,

- frost resistance of the paint - in accordance with GOST 28196, clause 4.8,

- hiding power of the dried film - according to GOST 8784,

- coating drying time - according to TU 2316.

Table 1 shows specific examples of the qualitative and quantitative composition of the proposed water-dispersion paint, in table 2 - data on the properties illustrating the achieved technical result.

The results obtained indicate the achievement of the purpose of the invention. From the data of table 2 it follows that the proposed composition in comparison with the prototype has the best strength and performance properties: increased resistance to the static action of water and a 3% solution of alkali, improves the conditional light resistance from 2.5 to 1.0-1.5% and whiteness from 91 to 94-95. In other respects, the proposed composition is not inferior to the prototype.

Thus, the proposed formulation expands the range of water-dispersion paints based on acrylic latexes. Paint can be prepared on the basis of domestic raw materials. The applicant company has prepared the production of paint according to this recipe, developed technical documentation.

Claims (3)

1. Water-dispersion paint containing film-forming, titanium dioxide, chalk and / or talc, hydroxyethylated alkyl phenol, dispersant - hexametaphosphate or sodium polyphosphate, antifoam, preservative, ammonia (25% aqueous solution), antifreeze, thickener and water, different in that, as a film-forming agent, it contains a copolymer of styrene and esters of acrylic acid or styrene and acrylic acid, as a thickener, a rare crosslinked copolymer of butyl acrylate, methacrylic acid and styrene or methylol methacrylamide, and in addition to alescent is butyl diglycol acetate or flotation reagent oxal, an optical brightener of the triazinaminostilbene series and optionally a composition of direct dyes of blue, green and red colors in a weight ratio of 1: 0.25-0.5: 0.005-0.01, giving a total white color, in the following ratio of components, wt.%: Copolymer of styrene and acrylic esters or styrene and acrylic acid 20-35 Rare crosslinked butyl acrylate copolymer, methacrylic acid and styrene or methylol methacrylamide 1-4 Titanium dioxide 15-30 Chalk and / or talcum powder 20-35 Butyl diglycol acetate or flotation reagent oxal 0.7-1.2 Oxyethylated alkyl phenol 0.1-0.15 Hexametaphosphate or sodium polyphosphate 0.3 Antifoam 0.03-0.25 Preservative 0.1-0.3 Antifreeze 1.0-1.5 Ammonia (25% aqueous solution) 0.4 Optical brightener 0.05-0.8 The specified composition of the dyes 0-0,0012 Water Else 2. The water-dispersion paint according to claim 1, characterized in that it contains 4,4'-bis- (4 "-anilino-6" -morpholino-triazin-2 "-amino) -2,2 as an optical brightener '-stilbendisulfonic acid, disodium salt - Belofor KD-2, or 4,4'-bis- [4 "-diethanolamino- (p-sulfoanilino) -triazin-2" -amino] -2,2'-stilbendisulfonic acid, sodium salt - Belfor OB. 3. The water-dispersible paint according to claim 1, characterized in that as direct dyes it contains Direct turquoise CB (C.I. Direct Blue 86), Direct green CB (C.I. Direct Green 26) and Direct scarlet (C.I. Direct Red 23).