CS255378B1 - Polymer silicate mixture - Google Patents

Abstract

Polymersilicate mixture consisting of inorganic binders, epoxy resins dian type and amine hardener a optionally additives from the group comprising known ones fertilizer additives, fillers, pigments, emulsifiers and water. Increased paint resistance frost-proof, external aggressive environment and improved adhesion concrete substrates are achieved by that the composition comprises an aqueous epoxy dispersion dian type resin of mol. weight 360 to 2000, optionally containing liquid glycidyl ethers on a monocyclic basis alcohols and water diluents polyaminoamide based hardeners o amine number 100 to 400 mg KOH / g k an inorganic binder.

Description

The invention relates to a new type of polymersilicate composition consisting of an inorganic binder, a dian-type epoxy resin and an amine hardener and optionally additives. These mixtures are used to increase the frost resistance, weathering of inorganic building materials and structures made therefrom, and to improve the adhesion of coatings prepared therefrom to concrete substrates.

It is currently known to use polymer-silicate blends, e.g. based on cement or other inorganic binder and aqueous polymer dispersions, e.g., a terpolymer with 2-ethyl-6-hexyl / acrylate and acrylic acid. However, these mixtures have a very low frost resistance. This drawback is, in some cases, overcome by the use of a mersilicate blend, wherein the polymer component as disclosed in U.S. Pat. an aliphatic polyamine hardener. However, the epoxy resin has a high viscosity and is difficult to mix with water or an inorganic binder.

The above-mentioned drawbacks are overcome by the present invention, which relates to a polymersilicate composition consisting of an inorganic binder, a dian-type epoxy resin and an amine hardener, and optionally additives from the group of known modifying additives, fillers, pigments, emulsifiers and water. The essence of the present invention is that the polymersilicate composition contains per 1 wt. 0.01 to 2.5 wt. 5 to 75% of an aqueous dispersion of a dian-type epoxy resin of mol. weight 360 to 2000, optionally containing up to 40 wt. parts of liquid glycidyl ethers based on monovalent and polyhydric alcohols, and a water-based hardener based on polyaminoemides having an amine number of 100 to 400 mg KOH / g in wt. ratio to epoxy resin content of 0.5 to 1.5: 1.

The polymersilicate compositions according to the invention are characterized by increased resistance to frost and weathering and improved adhesion of the coatings to various surfaces, in particular concrete.

All kinds of cements, lime, river sand, gravel, crushed aggregates, artificially expanded aggregates, expanded polystyrene, various types of fly ash, ground limestone, inorganic and organic ion exchangers can be used as inorganic binder according to the application.

If desired, the mixture comprises various additives. In particular, they are emulsifiers for the dispersion improvement added in an amount of 0.3 to 12 wt. parts. The best results are obtained by adding non-ionic emulsifiers, such as alkylene oxidized alkylphenols (ethoxylated nonylphenol), polymers or copolymers of alkylene oxides (ethylene oxide and propylene oxide). However, the types of anionic or cationic emulsifiers or mixtures of non-ionic and ionic emulsifiers, in particular anionic, for example with carboxylates, sulphates, sulphonates, are also suitable. In addition, cationic amine and onion emulsifiers are used, but are less suitable for combination with nonionic emulsifiers.

Furthermore, these mixtures can be modified with various inorganic or organic color pigments, eg titanium white rutile, chrome yellow and green, ferric red and black, ultramarine, Paris blue, versal green, blue, yellow and further dyes cyan, anthraquinone and phthalocyanine .

The polymersilicate compositions of the present invention find a wide range of applications, particularly in the construction industry. They are used in particular for the rehabilitation and repair of concrete surfaces, for watering joints, for filling and leveling potholes in concrete pavements. They are also suitable for the production of gravel and mortar for concrete substrates, for filling cracks and other cavities, for bonding concrete components, for fixing iron to concrete, for sealing very stressed floor joints, for impregnation, respectively. as a top layer of concrete substrates, permanent and fresh concrete, coatings, plasters and the like, eg concrete pavements, industrial or maintenance halls, high-rise and underground garages. These polymersilicate mixtures are further usable as protection against damages caused by frost, road salt, road lanes, airstrips and landing surfaces as a covering and sealing agent of concrete surfaces chemically and mechanically stressed, as well as primers of concrete substrates with good adhesion to the surface and as a universal coating system for concrete surfaces, steel and iron, which protects vertical and horizontal highly chemically stressed areas, eg in the construction of tanks, swimming pools, sewage treatment plants and the like.

The invention is further illustrated by the following examples.

Use of a water dispersion

An aqueous epoxy resin dispersion is prepared by mixing 100 wt. parts of low molecular weight epian resin of dian type of mol. weight 380 with 140 weight. parts of a 50% aqueous solution of polyamine amine having an amine number of 170 mg KOH / g. After thorough mixing, 100 wt. parts of water.

Dispersion B

The aqueous epoxy resin dispersion is

25537S.

prepared by mixing 80 wt. parts of palm type epoxy resin having a molecular weight of 1,100, 30 wt. 80 parts by weight of ethylene glycol benzylcidyl ether; parts of a 150% aqueous solution of polyamine amine having an amine number of 200 mg KOH / g. To improve dispersion, 5 wt. parts of a mixture of a non-ionic and a cationic emulsifier. Dispersion C

An aqueous epoxy resin dispersion is prepared by mixing 100 wt. parts of epian resin based on diane and epiclilorohydrin having a molecular weight of 700 and 130 wt. parts of a water-soluble polyaminoamide hardener in the form of a 50% aqueous solution having an amine number of 140 mg KOH / g. To improve dispersion, 5 wt. parts of a mixture of a non-ionic emulsifier (0.6 ethoxylnonylphenol with 4 ethylene oxide groups and 1.4 ethoxylnonylphenol with 35 ethoxy groups).

Example 1

The paint for the adhesive bonding layers is prepared by mixing dispersion A, 7 wt. parts of titanium white ruble type. 10 wt. % kaolin, 3 wt. parts by weight of sodium hexamethaphosphate and 30 wt. parts of water. This mixture has a shelf life of 5 hours. After application, a coating film is formed which has a hardness after 14 days of drying at 20 ° C min. 40% (determined by pendulum) and adhesion to concrete is min, 2 MPa,

Example 2

0.5 wt. part of dispersion B is added to 1 wt. % of the mixture of cement and fine sand of continuous granulometry in mass. 1 to 1 ratio.

After 48 hours wet storage at 21 ° C, the polymer silicate composition is stored for 14 days in a dry environment at 25 ° C and 50% relative humidity. After 14 days of storage in a dry environment, the mixture is cycled through the system for 6 hours in water at ^21! C and 18 hours at freezing at -25 ° C. In order to prove the good frost resistance of the polymersilicate composition, the standard mortar beams according to CSN 73 2117 were produced in wt. ratio cement, sand 1: 3 with water coefficient v / C = 0.5 and dimensions 20 X 20 X 160 mm in 3 pieces. These strips were coated both with and without the addition of an aqueous emulsion, and the comparison of the individual mixtures is shown in the following overview:

Mixture without addition of dispersion

1.4 wt. of Portland cement tr. 400

1.5 wt. part of sand gas’é granulometry fine

1.0 wt. water

Blend with styrene-2-ethyl-6-hexylacrylate-acrylic acid terpolymer dispersion (Sokrat 2804 AS)

1.4 wt. of Portland cement tr. 400

1.5 wt. a piece of sand smooth granulometry fine

1.0 wt. part Sokrat 2804 AS

Mixture with addition of styrene-2-ethyl-6-hexylacrylate-acrylic acid terpolymer dispersion (Socrat 2804 AS) and dispersion B

0.48 wt. of Portland cement tr. 400

0.52 wt. a piece of sand smooth granulometry fine

0.20 wt. part of Socrat 2804 AS

0.35 wt. part of dispersion B

Mixture with addition of dispersion B

0.48 wt. of Portland cement tr. 400

0.52 wt. part of the sand flowing granulometry fine

0.35 wt. % of the aqueous dispersion B

Evidence of the high frost resistance of the polymersilicate composition of the invention is shown in Table 1.

Table 1

Identification of mixture Number of cycles comparative 7 - decomposition of paints mixture with addition of Socrat

2804 and 15 - decomposition of paint mixture with addition of Socrat

2804 AS and polymersilicate mixtures according to the invention - paint breakdown mixture with addition of polymersilicate mixtures according to the invention - paint unchanged

Claims (1)

SUBJECT Polymersilicate mixture consisting of an inorganic binder, a palm-type epoxy resin and an amine hardener and optionally additives from the group consisting of known modifying agents, fillers, pigments, emulsifiers and water, characterized in that it contains, for one part by weight, inorganic binder 0.01 to 2, 5 parts by weight of a 5 to 75% aqueous dispersion of epoxy resin; weight 360 to 2,000, optionally containing up to 40 parts by weight of monohydric and polyhydric alcohols and a water-dilutable amine amide hardener having an amine number of 100 to 400 milligrams of KOH / g in a weight ratio to the epoxy resin content of 0.5 up to 1.5 to 1.