CS265020B1 - Bituminous emulsion stable - Google Patents

Abstract

Dew refers to a stable anionic asphalt emulsion of the oil-in-water type, which is composed of petroleum asphalt with a penetration of 40 to JO pcn. units at 25 °C, 0.5 to 3 >6 boron, alkylbenzenesulfonic acid □ alkyls Iq and Coq, 0.5 to 10 >5 alkaline hydrolysis of animal skin or its condensation product with aliphatic monocarboxylic acids ClO to, Cgo. 0.1. to 1 -,í wt. sodium or potassium hydroxide and water up to 100 -,σ b/not. Asphalt emulsion 00 does not split when mixed with cement, sand, hard water.

Description

The present invention provides a stable, anionic, oil-in-water bitumen emulsion.

Reduction, viscosities of bitumen and bituminous products ns. the value needed for its correct application can be achieved practically in three ways:

1) heating to a temperature at which the asphalt has a corresponding viscosity 2) by dissolving the asphalt in a suitable organic solvent

3) by dispersing asphalt in water in the form of fine particles under technological conditions that will allow the formation of a more or less stable emulsion.

The current effort to reduce the energy intensity of technological processes means increasing the interest of users in cold-applied asphalt products without the need for heating. In particular, environmental considerations are prevented since most of the hydrocarbon solvents evaporate to the atmosphere during application. For this reason, attention will be deteriorated more on cold-processed asphalt emulsions and their use does not give rise to minor ocological problems.

Asphalt emulsions are widely used mainly in road construction, waterproofing technology, as protection against soil erosion, mulch in agriculture, etc. Individual application methods require that the asphalt emulsion used has the appropriate properties.For the application of spraying technology, in particular, for bitumen maintenance pavement and restoration of aged bituminous waterproofing coverings is required that the emulsion breaks down immediately after contact with the aggregate, by retreating the additional precipitant, usually salts of divalent and trivalent metals / CaCl _? , AL ₂ / SO ,, / 3.

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On the other hand, in asphalt emulsion coating technologies in mixers, when applying the emulsion by coating and wherever the emulsion comes into contact with hard water, the emulsion needs to resist coagulation to the salts of divalent and trivalent metals (Ca, Kg, Pe, ΑΙ) «In the quality standards, the resistance to the action of ions of the mentioned metals is characterized by miscibility with Portland cement under the conditions of the ČSN 65 7205 XII 1 test, when a stable emulsion can dissipate a maximum of $ 3 wt., Asphalt.

The requisite emulsion stability can be achieved by the use of various stabilizers, forming a protective sheath of the asphalt globules and thus preventing their agglomeration with the consequent breakdown of the asphalt from the emulsion. Kc Intosch, l'BC, 44, 1656 (1952) and Kc Coy USP 2 481522 (1949) disclose the use of cyclic hydrocarbon compounds such as lignin or resin derivatives. However, these emulsions find insufficient storage stability. indicates BP 1 165 51? (1969), wherein the emulsifiers used are mono and dialkylbenzene sulfonates having a molecular weight of 400 to 500. These emulsions, in turn, are less stable against the action of divalent and trivalent metal ions and have high foaming properties which prevent their normal operational application. formulation of stable protective colloid emulsions of a protein nature, e.g. lecithin - USP 5,540,205 (196?) »hydrolyzed animal blood and casein -BP 555,505 (1929), glue -Dat.pat 58178 /1927/, rescal alkali yeast hydrolyzate - BP 154174-8 /196?/.Pro stabilization systems are unsuitable for the difficult availability of the described products, limited use of kPPALALIO Pardubice kašinin for the production of 'stable emulsion', for stabilization of emulsion used in the paper industry, but due to the heterogeneous cattle nutrition the chemical composition of casein it fluctuates, and thus its. stabilizing effects.

The disadvantages described are eliminated by solutions which: use i

265,020 synergistic properties of alkylarylsulfonate-type emulsifiers and protein-type stabilizers, wherein the asphalt emulsion of the stable oil-in-water type is a 30-75% w / w asphalt with a penetration of 40-300 units at 25 ° C, 0, 3% by weight. slkvlbenzensulfonových acid with alkyl _of C to C _on.

From 0.5 to 10% by weight of an alkaline hydrolyzate of animal skins and / or its condensate product with nonocarbazylic acids C10 to C18 of 0.1 to 0.7% by weight of sodium or potassium hydroxide with water up to 100% by weight;

In particular, a stable emulsion of this composition can be used to coat bituminous mixtures, with cold aggregates, to form mixtures for grassing slopes below.

Alkali hydrolyzate of animal skin, which has excellent enriching and stabilizing properties in the formation of asphalt emulsions from £ _f highlighted synergistically by the action of alkylarylsulfonic acids, is a mixture of glutin hydrolyzate of different molecular weight and is produced by pressure alkaline hydrolysis of chronic skin germinated and contains 10 to 50 amino acids (cligopeptides) with an average molecular weight of I50 to 350.Condensation of an alkaline hydrolyzate with monocarbosylic acids Ο ^ θε:

a surfactant having good emulsifying and stabilizing activity and higher stability against bacterial decomposition during storage is obtained.

The production of a stable emulsion is preferably carried out in an efficient emulsifier, such as a disintegrator, a multi-stage centrifugal pump, a colloid mill, in a continuous manner, i.e. by simultaneous dosing of the asphalt and water phases, as shown in the following examples.

Example 1

A stable anicnative asphalt emulsion, type C / V, is prepared by continuous mixing in a colloid mill of 55% by weight. an asphalt phase consisting of asphalt with noflown bitumen at a temperature of 80 ° C

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45 · wt. 80 ° C aqueous phase consisting of 2% by weight of alkylbenzenesulfonic acids (Dubacid ST-Petrochema Dubová), 6% by weight & 1kcal skin hydrolyzate / Chromolysate, ZAZ Jaromer production / with a dry matter content of 42%, 0.7% % sodium hydroxide and 91.2% water.

The resulting emulsion has the following color - light brown, viscosity 25 ° C quality parameters:

14.5 mm @ ³ > pH - 12.8, the average particle size of the asphalt 2.5 µm / 2 mulsion does not break down when mixed with cement and does not change its properties upon storage.

Example 2

A stable anionic type 0 / V asphalt emulsion is prepared in the same manner as in Example 1, using 0.7% potassium hydroxide instead of 0.77% sodium hydroxide to form the aqueous phase. The quality parameters of the emulsion obtained are the same as in Example 1.

Example 3

Asphalt emulsion of stable anionic type 0 / V is produced by continuous mixing in a colloid mill SOI ·· by weight of asphalt phase hot 120 ° C, consisting of asphalt road oil Δ-80 and · 40 · ρ by weight water phase at 80 ° C, containing 2% by weight of alkylbenzeasulphonic acid AB2S0N X - Effective product and 6% by weight of the condensation product of alkaline skin hydrolyzate with oleic acid - HSTARDOX M, Chemical and Metallurgical Society - 0.7% by weight of sodium hydroxide and 91.5 $ w / w.

The emulsion produced has a light brown color, a viscosity of 2 ° C - 16 nm / µ. pH - 12,9.Emulze does not cleave when mixed with cement, sand, hard water.After 6 months of storage does not change its properties.

Claims (3)

l _e stable anionic bitumen emulsion, oil in water, characterized in that it contains 30 to 700 hmot.ropného asphalt of penetration 40 to J00 jedn.při 2> C, _0> 5-3-f wt. alkylarylsulfokj ^r Selin, 0.5. 100 wt.% Alkaline skin hydrolyzate and / or condensation product thereof with 3 monocarboxylic acids, 0.1 to 10 wt.% Sodium hydroxide and / or potassium hydroxide, and water in an amount of up to 1000 wt. An asphalt emulsion according to claim 1, wherein the alkyl aryl sulfonic acids are alkylbenzenesulfonic acids and alkyls of up to 10%. 3. The asphalt emulsion of claim 1, wherein the animal skin alkaline hydrolyzate is a yeast hydrolyzate of varying molecular weight * s.s. polypeptides to amides, and is produced. Λ. »P 1 4 v. - - Λ -r * r \ * 5 -rr * v * \ pr,>» · * »*> ** - ^ 11 ^ ⁴ * 0 * Λ either X> V stvých or partially cleared and containing 10 to $ O0 hmot.aminokyselin j * _{oligopeptides;} of average molecular weight O r- <g i. «> ‘Ait emulsion p. zu i i t-i / u The product of animal skin alkaline hydrolyzate and monocarboalic acid contains aliphatic monocarboxylic acids C. _A to C- _n . £ 1V ·