DD289053A5 - CATION ACTIVE EMULSION - Google Patents

Abstract

The invention relates to a cationic emulsion for Straszenbauzwecke of polymer modified bituminous binder, cationic emulsifiers, mineral acid and water. According to the invention, the object is achieved by a cationic emulsion in which the bituminous binder is a polymer-modified bitumen consisting of 78 to 98 parts by weight of bitumen, 1.8 to 20 parts by weight of polybutadienes and 0.2 to 2.0 parts by weight of sulfur, with stirring at 160 to 230C for 5 hours. {Cation-active emulsion; polymer modified bitumen; polybutadienes; Sulfur; emulsifier}

Description

Field of application of the invention

The invention relates to a cationic emulsion for road construction of polymer-modified bituminous binder, cationic emulsifiers, mineral acid and water.

Characteristic of the known state of the art

Cation-active bituminous emulsions are preferred over other emulsion types for surface treatments, impregnation, bituminous slurries, as pressure-sensitive adhesives or binders for cold mix in the road industry. They are known to be characterized by short setting times, good adhesion to rock building materials and high durability of the layers.

To improve the mechanical properties as well as to increase the life of the layers or coatings produced from these emulsions, high polymers, especially elastomers, are also added to the emulsion binder. There are a number of different procedures. The longest known combination of substances is based on anionic rubber latexes, which are rendered cationic by stabilization and rearrangement. As a result, thus rearranged latices can be mixed with cationic bitumen emulsions and used together for road construction measures. Another type of process consists in the emulsification of already premixed bitumen-elastomer compounds by means of cation-active emulsifiers. The emulsification is more difficult because of the required higher heating of Bindemitteis and not succeed in all cases. Especially known are emulsions of compounds of bitumen with thermoplastic rubbers z. B. block polymers of the type SBS.

Furthermore, methods are known in which the bitumen is emulsified in a cationic latex. Since this latex must be very stable, this form has found little spread. The prior separate mixing of the bitumen and the elastomer in an oil with subsequent emulsification is due to the high technical complexity of little economic importance. Emulsions of already crosslinked with sulfur rubbers are not known in the prior art.

Object of the invention

The aim of the invention is a cationic emulsion for road construction with high performance characteristics and extended life, which can be produced by emulsification already cross-linked or pre-crosslinked bitumen Elastomerkompositionen without high technical complexity.

Explanation of the essence of the invention

The invention has for its object to develop a cationic emulsion for road construction of polymer-modified bitumen, cationic emulsifiers, mineral acid and water.

According to the invention the object is achieved by a cationic emulsion of a polymer modified bitumen consisting of 78 to 98Ma. parts bitumen having softening points of from 35 to 6O ⁰ C and resin proportions of at least 25Ma. parts in%, 1.8 to 20Ma. Part polybutadienes with numerical molar masses of 2000 to 10,000, iodine numbers of 350 to 450g J / 100g and viscosities at 2O ⁰ C of 250Pa · s and 0.2 to 2Ma.-Toile sulfur is obtained with stirring at 160 to 23O ⁰ C up to 5h. According to a further feature of the invention, up to 50 parts by mass in% of the bitumen fraction can be replaced by resin-rich hydrocarbon mixtures of petroleum processing and / or pitches or tars of coal and lignite processing.

The polymer-modified bitumens with crosslinked rubber fractions obtained according to this procedure have the advantageous rubber-elastic properties, such as high resilience with high recovery, high tack and increased adhesion to minerals and increased resistance at high and low temperatures. These positive properties are very valuable for road construction and thereby increase the life of the road coverings produced therewith.

By replacing a portion of the bitumen by resin-rich hydrocarbons, such as heavy vacuum distillates of petroleum processing or pitches or tars of stone and lignite processing, the properties mentioned can be improved or modified as desired.

Surprisingly, it is possible to produce cation-active emulsions in customary equipment and plants from the polymer-modified bitumen obtained with the aid of cation-active emulsifiers, mineral acid and water. In this case, it is possible to proceed in such a way that the polymer-modified bitumen obtained in accordance with the invention is processed immediately after its preparation into an emulsion together with a separately prepared aqueous solution of a cation-active emuigator and a mineral acid in conventional colloid mills.

Since the polymer-modified bitumen is more viscous than an otherwise used bitumen, temperatures of over 150 to 19O ⁰ C for liquefying for the emulsification process are necessary. The excess heat must be dissipated by cooling. As cationic emulsifiers, it is possible to use all known long-chain amines, diamines, tertiary or quaternary ammonium compounds in combination with acids, preferably hydrochloric acid.

embodiments

1. From 90 parts by mass of a bitumen having a softening point of 38 ⁰ C and a resin content of 38 parts by mass in%, which is determined by elution of the phase by column chromatography on activated alumina using acetone-benzene mixtures, 10 Ma. Parts of a polybutadiene having a molecular weight of 7,500, an iodine value of 390 g J / 100g and a viscosity at 20 ° C of 200Pa · s and 0.7 parts by weight of sulfur is a polymer-modified with stirring at 18O ⁰ C for one hour Bitumen having a softening point of 48 ⁰ C, a penetration of 120Vwmm, a breaking point of -18 ⁰ O, a recovery of 50%, which is then immediately in a proportion of 60Ma.-parts in% in a colloid mill with an aqueous solution consisting from 39.3Ma. parts in% water, 0.5Ma.-parts in% of a long-chain quaternary ethoxylated ammonium salt and 0.2 parts by mass in% of a 35% hydrochloric acid is processed into an emulsion. The emulsification is carried out so that the temperature during emulsification is maintained at most 95 ⁰ C. The emulsion is finely divided and is used for surface treatments. The emulsion formed has the following properties:

pH 2.0

Outlet time 2.5 mm nozzle 45s Adhesion to siliceous rock 95% Irrigation resistance after 30min 60%

2. The following feedstocks are used to produce the bituminous binder for the cationic emulsion: bitumen

Softening point R u. K ⁰ C molar mass Resin content parts by weight in% Viscosity at 20 ° C Pa -s Pour point ⁰ C Resin content parts by weight in% A 38 B 48 C 59 I 2050 Il 7500 III 9800 38 40 45 1,200,248 25 18 30 33 28 polybutadiene Hydrocarbon mixtures Iodine number gJ / 100g 1 Vacuum distillate of petroleum refining 2 Coal tar pitch 3 Brown coal low temperature tar 440 390 355 Softening point Ru-K ⁰ C 42

From these raw materials, bituminous binders for cationic emulsions are prepared according to the following reaction conditions:

Binder 12 3 4 5 6 7

Starting materials Ma. Parts hydrocarbon 78 88 98 - - 72 _ Bitumen A mixture of substances 1 - - - 80 - - 46 8th 2 - - - - 55 _ C 3 20 - - - - 18 - Polybutadiene I Sulfur Ma. Parts - 12 - 10 15 - - Il Mischtemperatur'C - - 2 - - - 8th III Mixing time h - - - 10 30 - - - - - - - 10 - - - - - - _ 46 2 0.8 0.2 0.7 0.8 1.5 1 220 200 230 180 160 170 190 3 0.5 5 2 0.5 2.5 3

The produced bituminous binders are worked up according to the following formulations and emulsifying conditions to cation-active bitumen emulsions with the mentioned property:

Emulsion 1 23456789

No. 1 2 3 4 5 6 7 2 2 Binder parts in% 60 60 60 60 60 60 60 65 65 Emulsifier ι parts by weight in% 0.5 - 0.4 1.0 - 0.5 0.25 0.25 - 2Ma.-Teilain% - 0.6 0.2 - 1.5 0.5 0.25 0.25 - 3Ma.-parts throughout% - - - - - - 0.1 _ 0.3 Hydrochloric acid 35% 0.2 0.3 0.3 0.4 0.5 0.4 0.3 0.3 0.3 Temperature of the Binder ° C 160 180 170 160 160 180 170 180 180 PH value 2.0 1.8 1.8 2.5 2.5 1.8 2.0 2.0 3.5 Outflow time 2.5 mm nozzle s 30 35 40 50 55 50 60 80 75 Adhesion to the rock% 90 90 95 90 90 90 95 100 100 irrigation resistance after 30 min 90 75 75 50 50 50 50 75 95

Emulsifier 1 is a long-chain, ethoxylated tertiary ammonium compound, emulsifier 2 is a long-chain, ethoxylated quaternary ammonium salt - both in 35% aqueous solutions. Emulsifier 3 is a diamine commonly used for emulsification.

The emulsions 1, 2, 3, 7, 8, 9 are preferably used for surface treatments or impregnation, emulsions 4 to 6 preferably for bituminous sludges, for the production of cold mix or as a pressure-sensitive adhesive.

Claims (2)

1. Cationic emulsion for road construction of polymer-modified bituminous binder, cationic emulsifiers, mineral acid and water, characterized in that a bituminous binder is a polynary modified bitumen is used, consisting of 78 to 98 parts by weight of bitumen with softening points of 35 to 60 ⁰ C and resin contents of at least 25Ma. parts in%, 1.8 to 20Ma. parts polybutadienes having numerical molecular weights of 2,000 to 10,000, an iodine number of 350 bis450gJ / 100gund viscosities at 20 ⁰ C of 1 to 250 Pa · sundo, 2bis 2,0lVla. divider. Sulfur is obtained by stirring at 160 to 23O ⁰ C up to 5 hours. 2. Cationic emulsion according to claim 1, characterized in that in the bituminous binder up to 50 parts by weight in% of the bitumen fraction resinous hydrocarbon mixtures, such as heavy vacuum distillates and or or residues of petroleum processing and or or pitches or tars of stone and Lignite processing individually or in mixture.