RU2400508C1 - Water-dispersed composition and method of its production - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to water-dispersed composition for finishing, hydraulic insulation and roof coatings containing powder emulsifier, thermoplastic binder, water, powder emulsifier is represented by mineral powder, talc, chalk, cement, lime, clay, pigment, cellulose, asbestos, each separately or their mixtures, thermoplastic binder is represented by polymer resin or rosin with plasticisers, plasticiser is represented by dibutyl phthalate, dioctyl phthalate; besides ratio of components in thermoplastic binder is selected so that binder softening temperature by ball and ring method makes 46-52°C, at the same time components are taken in the following amounts, wt %: petroleum polymer resin or rosin in amount of 19-20; plasticiser - 5-6; water - 45; emulsifier - the rest. Also invention relates to method for production of water-dispersed composition.

EFFECT: improved dispersion, homogeneity and stability of water-dispersed composition and accordingly quality of coatings made from it.

2 cl, 2 tbl, 2 dwg

Description

The invention relates to paints and varnishes, waterproofing and roofing materials, putties, primers and can be used for applying concrete, brick, plastered, wood-fiber, wood-chip and other materials to the surface.

Depending on the composition, the composition can be used in construction as a putty for leveling the surface of concrete or mortar, asphalt concrete, wood and other building materials, as well as for painting or waterproofing them.

Known water-dispersion composition for coating (RF patent No. 2168529, publ. 06/10/2001), including a film former - an aqueous emulsion of an acrylic copolymer, a pigment - titanium dioxide, a filler - talc, a thickener - sodium carboxymethyl cellulose, an emulsifier - polyoxyethylene ether alkylphenol dispersant - sodium polyphosphate, antifreeze - diethylene glycol, antifoam - tributyl phosphate, stabilizer - polyvinyl alcohol, pH stabilizer - ammonia (25% aqueous solution), filler - microcrystalline cellulose with particle sizes 19-100 microns, biocidal additive - thiuram "D", water.

A method of preparing the known composition consists in preparing a pigment paste, in a mixer with hot water load: sodium carboxymethyl cellulose, polyvinyl alcohol, polyoxyethylene ether of alkyl phenol, then portionwise: diethylene glycol, tributyl phosphate, then sodium polyphosphate, titanium dioxide, talc, thirocrystal D . Dispersion of the pigment paste is carried out by rolling. Next, an aqueous solution of ammonia, an aqueous emulsion of an acrylic copolymer, and the remaining water are successively loaded into the mixer.

The disadvantages of the known composition are the low uniformity, complexity and instability of the composition, which entails the delamination of the material, as well as the relatively long duration of its manufacture (from 1 hour 40 minutes to 2 hours 45 minutes).

Known water-dispersion paint (RF patent No. 2142975, publ. 12/20/1999), including an aqueous emulsion of acrylic copolymer methyl methacrylate, butyl acrylate and methacrylic acid MGM-5 (50%) or styrene acrylic copolymer n-butyl acrylate and styrene, acrylic copolymer emulsion MBM-20 or carboxymethyl cellulose sodium salt - a structuring additive, pigments, talc fine-ground - filler, dispersant, preserving, anticorrosive, antifoam additives, ammonia 26%, antifreeze and drinking water, additionally contains as As additives that reduce moisture absorption, sodium methylsiliconate - hydrophobizing organosilicon liquid GKZH-11 - and micronized barium sulfate.

The paint is obtained by combining acrylic emulsions or styrene acrylic, pre-neutralized to pH 8.5-9.0 with ammonia solution, with an aqueous paste of pigments and fillers. Water paste is obtained by dispersing pigments and fillers in mills (ball or bead), roller painters or any other dispersing apparatus, on a semi-finished product consisting of drinking water, dispersing surface-active and other target additives, using the technology characteristic of water-dispersion paints .

The disadvantages of the known water-dispersion paint are the need to use expensive constituent components; relatively low uniformity, complexity and instability of the paint composition, which entails the delamination of the material, and the method of producing paint is multi-stage and not sufficiently technological.

A known method of producing cold bitumen emulsion mastic (USSR patent No. 1804471, publ. March 23, 1993), first lime is mixed with latex and asbestos-cement waste, then the preheated bitumen is gradually introduced into the resulting suspension with constant stirring (up to 140-170 ° C) and water heated to 60-90 ° C. The viscosity of the resulting mastic is controlled by its mobility, determined by the draft of a standard cone, equal to 12-14 cm. Asbestos filler in the mastic uses asbestos-cement production wastes (water pulp), additionally styrene-butadiene latex, and fluff lime as lime .

The disadvantages of the known method for producing cold bitumen emulsion mastic are the production of material with relatively low quality indicators for dispersion and uniformity, which results in low quality and its instability.

The technical result of this invention is to simplify the composition and expand the types of powder emulsifiers used, including waste, reduce the consumption of polymer binder, simplify the technology for producing a water-dispersion composition, increase its dispersion, uniformity and stability and, accordingly, the quality of coatings made from it.

The specified technical result is achieved in that the water-dispersion composition for finishing, waterproofing and roofing, including a powder emulsifier, thermoplastic binder, water, according to the invention as a powder emulsifier contains mineral powder, talc, chalk, cement, lime, clay, pigment, cellulose, asbestos individually, or mixtures thereof, as a thermoplastic binder use an oil polymer resin or rosin with plasticizers, dibutyl is used as a plasticizer phthalate, dioctyl phthalate, moreover, the ratio of the components in the thermoplastic binder is chosen such that the softening temperature according to the KiS binder is 46-52 ° C; while the components are taken in quantity, wt.%: thermoplastic binder - 19-20, plasticizer - 5-6; water - 45; emulsifier - the rest.

The choice of the softening temperature range is due to the fact that at a binder softening temperature below 46 ° C, the heat resistance of the resulting coating is not high enough, at a binder softening temperature of more than 52 ° C, the resulting water-dispersion composition is not uniform and coarse.

A method of obtaining a water-dispersion composition for finishing, waterproofing and roofing, including heating an aqueous dispersion medium, loading it into a dispersing mixer, batch loading a powder emulsifier into a working mixer-dispersing agent, thoroughly mixing, loading a hot melt of a thermoplastic binder, thermoplastic melt according to the invention the binder in the dispersion medium begins to be fed at a concentration C of the powder emulsifier in water at which it appears in the dispersion system, the ultimate shear stress Р _К or break occurs on the dependence of viscosity η - concentration С; moreover, a thermoplastic binder with a temperature of 120-150 ° C is introduced into the aqueous dispersion medium with an emulsifier; in the process of supplying the melt of a thermoplastic binder to the mixer-dispersant, water with a temperature of 60-90 ° C is simultaneously supplied in an amount that ensures precipitation of the cone of the finished water-dispersion composition within 12-14 cm.

The figure 1 shows the dependence of the relative viscosity VU20 (-) and the ultimate shear stress P _to at 20 ° C (---) dispersion of the powder emulsifier on its concentration in water C: 1 - clay; 2 - non-activated limestone mineral powder; 3 - cement; 4 - asbestos; 5 - talc; 6 - lime.

In figure 2 - the dependence of VU20 (-) and P _to at 20 ° C (---) on the concentration of the mixture of powder emulsifiers C: 7 - a mixture of clay with cement at a ratio of 1: 1; 8 - a mixture of lime, mineral powder, clay and pigment red iron oxide in a ratio of 1: 4: 4: 1; 9 - a mixture of asbestos and lime at a ratio of 1: 1.

The selection of the optimal concentration C of a powder emulsifier in water is carried out using a viscometer or using a conical plastometer. By mixing thoroughly, a powder emulsifier is added to the water, after thoroughly mixing each sample, viscosity η or ultimate shear stress P _k at 20 ° C is measured. Experimentally establish the concentration at which there is a sharp break in the dependence of viscosity-concentration or there is a maximum shear stress P _to , which is taken as the optimal concentration of the powder emulsifier. As a powder emulsifier use: mineral powder, talc, chalk, clay, phosphogypsum, soot, which are fillers in the composition; cement, lime, which are binders that increase the strength and water resistance of the composition; cellulose, asbestos-fiber additives that increase the strength and crack resistance of the composition, pigment dyes and the like, each individually or in a mixture. Moreover, when choosing any emulsifier or their mixture using this method, it is possible to determine the optimal concentration of emulsifier, which, in turn, allows you to get a composition with a sufficiently high dispersion, uniformity and stability and, accordingly, to ensure high quality of coatings obtained from it.

A method of obtaining a water-dispersion composition is as follows: water is heated, then it is fed into a dispersing mixer.

Powder emulsifier is loaded with a mixture of emulsifiers of optimum concentration C in a working mixer-dispersant filled in the required amount with water. After thorough mixing, the hot melt of the thermoplastic binder is loaded into the dispersion medium; moreover, the plasticizer is introduced into the thermoplastic binder in such an amount that the softening temperature according to the KiS binder reaches a value of 46-52 ° C; the temperature of the thermoplastic binder is 120-150 ° C; in the process of supplying the melt of the thermoplastic binder to the mixer-dispersant, additional water is simultaneously supplied in an amount that ensures precipitation of the cone of the finished water-dispersion composition in the range of 12-14 cm. Petroleum resin, rosin with plasticizers, etc. are used as the thermoplastic binder dibutyl phthalate, dioctyl phthalate and the like are used as a plasticizer.

The composition of the composition is selected to achieve the required properties of sample properties of the composition prepared from a mixture of molten binder and powder components heated to 120-150 ° C, and checked according to the properties of samples prepared from a water-dispersion composition at the age of 14 days. Table 1 presents the compositions of water-dispersed compositions, in table 2 - data on the main properties of the proposed varieties of water-dispersed compositions. In the columns of the tables under No. 1-6, the compositions on separate powder emulsifiers are indicated, under No. 7-9, compositions of mixtures of powder emulsifiers according to the invention, and under No. 10, the composition according to the prototype.

Table 1 Component Composition, wt.% one 2 3 four 5 6 7 8 8a 9 10 Bitumen of the oil brand BND 60/90 - - - - - - - - - - 41 Styrene-butadiene latex SKS-65GP - - - - - - - - - - four Lime Fluff - - - - - 16 - 3 3 7 2 Asbestos cement waste - - - - - - - - - - eighteen Limestone Mineral Powder - thirty - - - - - 12 12 - - Talc - - - - thirty - - - - - - Cement - - thirty - - - 12 - - - - Clay fifteen - - - - - 12 12 12 - - Pigment red iron oxide - - - - - - - 3 3 - - Asbestos - - - fifteen - - - - - 7 - Petroleum Resin thirty 19 19 thirty 19 29.7 23.5 19 - 30.5 - Dibutyl phthalate 10 6 6 10 6 9.3 7.5 6 - 105 - Rosin - - - - - - - - twenty - - Dioctyl phthalate - - - - - - - - 5 - - Water 45 45 45 45 45 45 45 45 45 45 35

table 2 Indicator Composition number one 2 3 four 5 6 7 8 8a 9 10 Heat resistance, ° С 81 87 94 80 88 80 91 92 92 80 77 Water absorption,% 5,0 4.2 3,7 4.6 4.0 4.9 4.6 4.0 3.9 5.1 5.2 Swelling% 1.4 0.9 0.5 1,1 0.6 0.6 1,0 1.3 1,2 0.7 1,5 Water tightness, MPa 0 0.01 0 0.01 0.01 0.01 0.01 0.01 0.01 0.01 - Tensile strength at break at 20 ° C, MPa 0.30 0.38 0.42 0.44 0.39 0.30 0.31 0.4 0.45 0.34 - Frost resistance cycle 5 6 7 6 6 6 6 6 6 7 - Adhesion to concrete, MPa 0.42 0.4 0.4 0.36 0.39 0.38 0.4 0.41 0.4 0.4 0.3 Homogeneity (residue on a sieve 0.2 mm), wt.% 1,2 1,1 0.8 0.91 1,0 0.8 1,0 1,1 0.9 0.9 1,6

Thus, the proposed water-dispersion composition for finishing, waterproofing and roofing of the proposed compositions, prepared by the proposed method, has better indicators of uniformity, more heat-resistant and water-resistant, has a higher adhesion to concrete in comparison with the prototype, has a lower polymer consumption astringent.

As a result of the implementation of this invention, a composition with a sufficiently high dispersion, uniformity and stability is obtained, which ensures high quality of the coatings obtained with its help. The composition has a fairly simple composition and in the process of implementing the method, a significant simplification of the technology for producing the claimed water-dispersion composition is achieved.

Claims (2)

1. A water-dispersion composition for decoration, waterproofing and roofing, including a powder emulsifier, thermoplastic binder, water, characterized in that the powder emulsifier uses mineral powder, talc, chalk, cement, lime, clay, pigment, cellulose, asbestos each individually or a mixture thereof, an oil polymer resin or rosin with plasticizers are used as a thermoplastic binder, dibutyl phthalate, dioctyl phthalate are used as a plasticizer; moreover, the ratio of the components in the thermoplastic binder is chosen such that the softening temperature according to KlS of the binder is 46-52 ° C, while the components are taken in the amount, wt.%: oil polymer resin or rosin in the amount of 19-20; plasticizer - 5-6; water - 45; emulsifier - the rest. 2. A method of producing a water-dispersion composition for waterproofing and roofing coatings according to claim 1, including heating the aqueous dispersion medium, loading it into a dispersing mixer, portioning a powder emulsifier into a working mixer-dispersing agent, thoroughly mixing, loading a hot melt of a thermoplastic binder characterized in that the melt of the thermoplastic binder into the dispersion medium begins to be supplied at a concentration C of a powder emulsifier in water at which it appears in di in a spERSional system, the ultimate shear stress Р _K or a kink occurs on the dependence of viscosity η - concentration C; moreover, a thermoplastic binder with a temperature of 120-150 ° C is introduced into the aqueous dispersion medium with an emulsifier; in the process of supplying the melt of a thermoplastic binder to the mixer-dispersant, water with a temperature of 60-90 ° C is simultaneously supplied in an amount that ensures precipitation of the cone of the finished water-dispersion composition within 12-14 cm.

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