RU2331659C1 - Latex priming composition - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention pertains to production of coating materials, in particular to finishing materials, used for external and internal finishing of buildings and other structures, and more specifically relates to materials for coating concrete surfaces. Description is given of the latex priming composition, which contains a latex film-forming agent in form of a 50% syrup of acrylic dispersion DL-430 or Acronal-290 based on a copolymer of methylacrylate, butylacrylate, acrylamide, styrene and ethylbenzene in quantity of 5-50 mass %, plasticiser - dibutylphtalate or dioctylphtalate in quantity of 0.2-3.0 mass %, surface active substances based on polyoxyethylene esters of alkylphenols in quantity of 0.2-1.0 mass %, kaolin 20-30 mass %, fine-dispersed chalk 20-30 mass %, thickener 0.4-6.0 mass %, carbon black 0.2-1.0 mass % and water. The composition contains an extra technical target additive, chosen from a group containing a coalescent additive, anti-foaming agent, antiseptic additive, alkali, antifreeze or their mixture.

EFFECT: obtaining latex priming with short drying time, low water absorption and vapour permeability, high freezing and heat resistance.

2 cl, 1 tbl, 5 ex

Description

The present invention relates to the chemical industry and relates to the production of paints and varnishes, in particular decorative materials used for exterior and interior decoration of buildings and structures, and specifically relates to primers for treating concrete surfaces in order to protect them from moisture, for example, building products before application decorative and protective coatings.

Recently, for the treatment of various surfaces (metal, concrete, plastered), aqueous primers based on various copolymer latexes (polyvinyl acetate, polyvinyl chloride and especially acrylic, in particular styrene acrylic) have been widely used because of their environmental safety, fire safety, ease of application and low toxicity.

Water dispersions of acrylic copolymers and, in particular, latex of styroacrylic copolymers, due to their high technological and protective properties, have found particular distribution among polymer latexes in the preparation of finishing primers.

A known composition for finishing work, including, wt.%: Latex 30-50, thickener 0.8-1.5, filler 30-40 (USSR copyright certificate No. 872500, 10/15/1981). As a latex film-forming known composition contains styrene butadiene latex SKPS-50 or acrylate latex AK-202.

Another composition for finishing work is known, including, wt.%: Plasticized polyvinyl acetate emulsion - synthetic latex 0.1-0.2, pigments 13-15, water 4-5, sand 35-40, marshalite 20-29, triethylamine 1- 2 (USSR copyright certificate No. 501998, 1976).

A disadvantage of the known compositions are low properties, such as adhesion to the surface to be coated, light, alkali and water resistance.

From RU No. 2153512, 07.27.2000, a composition for finishing works is known, including a binder based on synthetic latex and a filler, it contains synthetic latex as a binder and has the following composition of components, wt.%: Synthetic latex 32-80, surfactant - ethoxylated alkyl phenol OP-7 in the form of a 40% aqueous solution of 0.4-3.0, if necessary a thickener 0-3.0, sodium tripolyphosphate in the form of a 10% aqueous solution of 1.0-5.0, metocel - water-retaining component - hydroxypropylated methylcellulose in the form of 1.6% water solution 0-49, alkali in the form of a 20% aqueous solution of 0.5-10, and also antifoam in the form of a 20% aqueous solution of 0.5-4.8, antifreeze 0-5.0, coalescent 0 -14, and as a filler it contains a mixture, wt.%: White filler 1-99 and filler additionally colored 1-99 and additionally antimony trioxide and a fungicidal additive.

The following synthetic latexes are used in the known composition: DL-424, 430, XZ 92099 styrene acrylic, under contract with Dow Chem, Primal 219N styrene acrylic, under contract with Room and Haas, Lacryl 21, styrene acrylic, MBM-5C, acrylic, manufacturer of LLC Orgkhimprom, Dzerzhinsk, according to TU 2241-002-39251899-96 and NE 6-01-274-79, Movilit DM 771, 6610, DL 611, styrene acrylic dispersions under a contract with Hecht .

As other fillers, the known composition contains: colored sand - quartz or carbonate (marble), painted with a mixture of the pigment of the corresponding color in liquid glass or epoxy binder production "Plastone"; marble chips, white or painted white with a main fraction of 5, 15, 40, 130 microns, 0.2-1.5 mm produced by Plastone; organic and inorganic pigments under contracts with Bayer, Germany, Holiday, England, or domestically produced Dulevo and other manufacturers (TU 2364-017-00303835-96, TU 301-10-019-90, GOST 8135-74 GOST 22699-77).

This composition is also not intended as a primer composition; the composition has the following properties: water resistance of 7 days, light fastness of 12-24 hours, adhesion of 0.2 MPa, data on temperature operating conditions are not available.

The closest in technical essence to the claimed invention is a putty (RU 2164234, 03.20.2001), which includes synthetic latex, surfactant, thickener, chalk and water, as a surfactant contains the product of the processing of mono- and dialkylphenols with ethylene oxide - OP-7 or OP-10 and additionally a dispersant, coalescent, antimony trioxide, biocide additive, antifoam, plasticizer, alkali, and it may also contain talc, silica sand and silica flour in the following ratio, wt.%: S synthetic latex 5-30, surfactant OP-7 or OP-10 0.1-1.5, thickener 0.05-1.5, dispersant 0.1-1.5, coalescent 0.05-3, biocidal additive 0.01-1, antifoam 0.01-1, antifreeze 0.0-5.0, plasticizer 0.05-10.0, antimony trioxide 3.0-5.0, alkali 0.05-5, chalk 30-70, talc 0-20, silica sand 0-20, silica flour 0-25, the rest is water.

For the preparation of putty, the following components are used:

Latexes: DL-424, 430, XZ 92099, styrene acrylic, under contract with Dow Chem; Primal 219N, styrene acrylic, under contract with Room and Haas; Lacryl 21, styrene acrylic, MBM-5C, acrylic, manufacturer LLC Orkhimprom, Dzerzhinsk, respectively, according to TU 2241-002-39251899-96 and TU 6-01-274-79; Movilit DM 771, 6610, DL 611, styrene acrylic dispersions, under a contract with Hecht, Acropal 290D - styrene acrylic dispersions, under a contract with BASF;

Dibutyl phthalate - plasticizer, GOST 8728-88;

Dioctyl phthalate - plasticizer, GOST 8728-77;

EDOS - a mixture of formulas and oligomers of dioxane alcohols, TU 2493-003-13004749-93;

Plastilite 3080, 3060 - propylene glycol alkylphenyl ether, plasticizer of the company "BASF";

Chalk - calcium carbonate, with the main fraction of 5, 15, 40, 130 microns, GOST 12085-88;

Sand quartz Volgograd, Ramensky or Chelyabinsk fractions of 0.1-0.3 mm;

Talc - filler, magnesium hydrosilicate, product of the company "Finnminerals";

Antimony trioxide, TU 48-14-1-82.

Putty Characteristic:

Density, g / cm ³ 1,6-1,7

Drying time to degree 3, hour, no more than 24

Adhesion to concrete surface, MPa 0.7-0.9

Workability - good sanding, no cracks.

Resistance to static action of water, hours, not less than 24.

However, this putty is not intended as a full primer coating and does not provide the necessary range of properties for primer materials. Data on temperature operating conditions are also not available.

The technical task of the claimed invention is to increase the temperature range of its operability, improve adhesion strength, increase water resistance, reduce vapor permeability.

1. The stated technical problem is achieved in that the composition is latex primer containing latex film-forming in the form of a 50% styrene acrylic dispersion DL-430 or Acronal-290 based on a copolymer of methyl methacrylate, butyl acrylate, acrylamide, styrene and ethyl benzene, plasticizer-dibutyl phthalate or surfactants based on polyoxyethylene ethers of alkyl phenols, kaolin, finely divided chalk, thickener, industrial carbon and water, in the following ratio of components, wt.%:

The above styrene acrylic dispersion, DL - 430 or Acronal - 290 5-50 Dibutyl phthalate or dioctyl phthalate 0.2-3.0 Surfactants based on polyoxyethylene alkyl phenol esters 0.2-1.0 Technical carbon 0.2-1.0 Fine chalk 20-30 Kaolin 20-30 Thickener 0.4-6.0 Water rest

The latex primer composition according to the invention, if necessary, may additionally contain a technological target additive selected from the group comprising a coalescing additive, antifoam, antiseptic additive, alkali, antifreeze, or a mixture thereof. In the latex primer of the invention, styrene acrylic latexes DL-430 (styrene acrylic) are used under a contract with Dow Chem based on a copolymer of methyl acrylate, butyl acrylate, acrylamide, styrene and ethyl benzene, and Acronal-290 latex under a contract with BASF based on a copolymer of methyl methacrylate, butyl acrylate, acrylamide, styrene and ethylbenzene, which have a solids content of 50-52 wt.% and are used in the form of aqueous dispersions.

As a surfactant based on polyoxyethylene ethers of alkyl phenols, the latex primer composition contains, for example, surfactants of the type OP-7, OP-10.

In the composition of the latex primer, finely dispersed (finely dispersed) chalk is used, as well as kaolin (enriched).

The latex primer composition according to the invention contains such targeted technological additives as a thickener, mainly a cellulose thickener, in particular MT-100 grade cellulose and, optionally, coalescing additives, in particular white spirit, dispersing additives, in particular preferably sodium tripolyphosphate.

As a filler pigment, the composition of the latex primer contains technical carbon.

A primer composition is used for priming various surfaces, in particular surfaces of building materials and products, for example, ends of concrete surfaces of concrete building envelopes.

Apply it on a dust-free surface of concrete slabs with a brush or spatula, then stand for 3-5 minutes.

The latex primer composition according to the invention is obtained according to the traditional technology adopted for latex paint and varnish materials, in particular, first preparing aqueous solutions of surfactants, dispersants, then they are mixed with latex film-forming styrene acrylic DL-430 or Acronal-290 mixed with chalk, if necessary ( for pH adjustment) with sodium hydroxide and, if necessary, with other specified technological target additives (coalescing additives, thickener, antifoam, other pigments - fillers, antiseptic supplement).

The composition of the latex primer is a homogeneous pasty mass. Warranty period of storage is 6 months; the composition has a viscosity Suttard Viscometer "BC" at 20 ± 0.5 ° C 40-80 s, a drying time of not more than 60 minutes, adhesion to concrete (MPa) of at least 0.2; water absorption of not more than 1.0% by weight; vapor permeability coefficient mg / (mchPa) not more than 0.01; film adhesion 1 -2 points; the composition is operable in the temperature range from -50 to + 50 ° C.

Compared with RU 2164234 (prototype), the claimed composition has a shorter drying time of not more than 60 minutes (in the prototype not more than 24 hours), low water absorption of not more than 1%, low vapor permeability and can be operated as at low temperature (up to -50 ° С ) (frost-resistant composition), and at elevated temperatures (up to + 50 ° C), that is, a heat-resistant composition. The known composition does not have such properties (data on these properties are absent in patent RU 2164234).

The table shows examples of latex primer compositions according to the invention.

Examples of latex primer compositions of the invention Name of components The ratio of components in the examples, wt.% one 2 3 four 5 1. Latex film-forming: - 50% aqueous styrene acrylic dispersion DL-430 36.0 - 50,0 - 35.0 - 50% aqueous styrene acrylic
Acronal dispersion - 290 - 5,0 - 40,0 - 2. Surfactant: - Op-10 0.5 0.2 1,0 1,0 1,0 3. Plasticizer: - dibutyl phthalate 1.8 3.0 - - 3.0 - dioctyl phthalate - - 0.2 1,0 - 4. Fine chalk 24.0 30,0 20,0 25.0 20,0 5. Koalin 21.0 30,0 20,0 20,0 20,0 6. Thickener: - MTs-100 0.4 6.0 0.5 0.4 0.4 7. Dispersant: - sodium tripolyphosphate 0.5 1,0 2,5 - 1,0 8. Coalescing additive: - White Spirit 0.5 - - 0.5 0.2 9. Antiseptic supplement: - Sodium Benzonate 1,5 - - 1,0 - 10. Antifoam: - Lumiten EL (BASF) 0.5 0.2 - 0.3 0.2 11. Ethylene glycol 1,0 0.5 2.0 - 1,0 12. Technical carbon 0.2 1,0 0.2 0.5 0.5 13. Water rest rest rest rest rest

Claims (2)

1. A latex primer composition containing a latex film-forming in the form of a 50% styrene acrylic dispersion DL-430 or Acronal-290 based on a copolymer of methyl methacrylate, butyl acrylate, acrylamide, styrene and ethyl benzene, a plasticizer-dibutyl phthalate or dioctyl ethylene phthalate based on surface alkylphenol ethers, kaolin, finely divided chalk, thickener, industrial carbon and water in the following ratio of components, wt.%: The above styrene acrylic dispersion DL-430 or Acronal-290 5-50 Dibutyl phthalate or dioctyl phthalate 0.2-3.0 Based Surfactants polyoxyethylene ethers of alkyl phenols 0.2-1.0 Technical carbon 0.2-1.0 Fine chalk 20-30 Kaolin 20-30 Thickener 0.4-6.0 Water Rest 2. The latex primer composition according to claim 1, characterized in that it further comprises a technological target additive selected from the group comprising a coalescing additive, antifoam, antiseptic additive, alkali, antifreeze, or a mixture thereof.