RU2244725C1 - Bitumen emulsion - Google Patents

Abstract

FIELD: road-building materials.

SUBSTANCE: pavement-intended bitumen emulsion contains, wt %: bitumen, 45-49; surfactant-type emulsifier in the form of amines, diamines, polyamines, and quaternary ammonium salts, 0.125-0.25; aqueous hydrochloric acid for neutralization of emulsifier, 1-2; additionally, polyalkylbenzene resin produced as by-product in isopropylbenzene production process, 1-15; and water, the balance.

EFFECT: increased resistance of bitumen component to oxidative ageing processes without losses in other performance characteristics.

2 tbl, 12 ex

Description

The invention relates to bitumen emulsions used in the manufacture of pavements.

Known bitumen emulsion for road works, including bitumen, a cationic adhesive additive, hydrochloric acid and water [Methodical recommendations for the preparation and use in road construction of cationic emulsions. M., Union Research Institute, 1973, pp. 3-24].

The disadvantages of this emulsion are the lack of stability and adhesion to the mineral filler and the difficulty of regulating the rate of its decay at the same emulsifier content.

The closest to the invention is a bitumen emulsion [patent RU No. 2176652, class. 7 C 08 L 95/00, 2001], including bitumen, a surfactant-based emulsifier such as amines, diamines, polyamines and quaternary ammonium salts, hydrochloric acid as a reagent to neutralize the emulsifier and water. Moreover, it additionally contains a waste of the process of pyrolysis of hydrocarbons - heavy pyrolysis resin with the following ratios of components, wt.%:

Bitumen 20-70

Emulsifier 0.1-5

reagent to neutralize the emulsifier 0.5-3

TPN 0.4-8

water rest

The recipe of the emulsion allows you to adjust the rate of its decay at the same emulsifier content, increases its stability and adhesion to the mineral filler, and also helps to save bitumen.

The disadvantage of the emulsion is the lack of resistance to oxidative aging processes. Changes in the values of the depth of penetration of the needle and the elongation of bitumen extracted from the emulsion, relative to the values of the corresponding indicators of the initial bitumen used to prepare the emulsion, do not meet the requirements of GOST 18659-81 on road bitumen emulsions, according to which these changes should not exceed 15%, while as for the prototype, the values of these indicators are reduced by 16-19%. The indicated drawback is apparently caused by the presence of TPS (according to the results of analyzes by NMR and IR spectroscopy)

unsaturated olefin structures and unsaturated aliphatic aldehydes. The specified disadvantage can lead to a reduction in the service life of pavements.

The objective of the invention is the development of an emulsion that improves the stability of the bitumen component to oxidative aging processes while maintaining the remaining advantages, namely the ability to control its decay rate at the same emulsifier content, high stability and good adhesion to the mineral filler and saving bitumen.

The problem is solved by the development of a bitumen emulsion, including bitumen, emulsifier, a reagent to neutralize the emulsifier, water and an additional component, characterized in that as an additional component it contains a by-product of the production of isopropylbenzene - polyalkylbenzene resin in the following ratios of components,% wt .:

Bitumen 45-60

Emulsifier 0.125-0.25

Reagent for neutralizing emulsifier 1-2

Polyalkylbenzene Resin 1-15

Water rest

For the preparation of the emulsion using oil road bitumen brands BND 60/90 and BND 90/130 in accordance with GOST 22245-90.

The physicochemical parameters of polyalkylbenzene resin (PABS) (product of Kazanorgsintez JSC, TU 38.10296-83) are given in Table 1.

Surfactants such as amines, diamines, polyamines and quaternary ammonium salts are used as emulsifier.

Concentrated hydrochloric acid is used as a reagent to neutralize the emulsifier.

A bitumen emulsion is prepared by known technology by mixing the components in the following sequence:

In the mixture of water, emulsifier, acid and PABS, heated to 70-75 ° C with stirring, road bitumen preheated to 120-125 ° C is also added with stirring.

Samples of bitumen emulsions were prepared in accordance with the following examples:

Example 1. To a mixture of 77.75 g of water, 0.25 g of an emulsifier, 2 g of acid and 2 g of PABS, heated to 75 ° C, 118 g of pre-added with constant stirring

Heated in a separate container to 125 ° C road bitumen BND 60/90 and mix until completely homogeneous.

The composition of the emulsion obtained is as follows (% wt.): Bitumen - 59, emulsifier - 0.125, acid - 1, PABS - 1, water - 38.875.

Example 2. To a mixture of 77.75 g of water, 0.25 g of an emulsifier, 2 g of acid and 6 g of PABS, heated to 75 ° C, with constant stirring, 114 g of road bitumen BND 60 preheated in a separate container to 125 ° C are added. / 90 and mix until completely homogeneous.

The composition of the emulsion obtained is as follows (% wt.): Bitumen - 57, emulsifier - 0.125, acid - 1, PABS - 3, water - 38.875.

Example 3. To a mixture of 77.75 g of water, 0.25 g of an emulsifier, 2 g of acid and 10 g of PABS heated to 75 ° C, with constant stirring, add 110 g of road BND 60 bitumen preheated in a separate container to 125 ° C. 60 / 90 and mix until completely homogeneous.

The composition of the emulsion obtained is as follows (% wt.): Bitumen - 55, emulsifier - 0.125, acid - 1, PABS - 5, water - 38.875.

Example 4. To a mixture of 77.75 g of water, 0.25 g of an emulsifier, 2 g of acid and 20 g of PABS heated to 75 ° C, 100 g of BND road bitumen preheated in a separate container to 125 ° C are added with constant stirring 60/90 and mix until completely homogeneous.

The composition of the emulsion obtained is as follows (% wt.): Bitumen - 50, emulsifier - 0.125, acid - 1, PABS - 10, water - 38.875.

Example 5. To a mixture of 77.75 g of water, 0.25 g of an emulsifier, 2 g of acid and 30 g of PABS heated to 75 ° C, with constant stirring, add 90 g of road BND 60 bitumen preheated in a separate container to 125 ° C. 60 / 90 and mix until completely homogeneous.

The composition of the emulsion obtained is as follows (% wt.): Bitumen - 45, emulsifier - 0.125, acid - 1, PABS - 15, water - 38.875.

Example 6. To a mixture of 75.5 g of water, 0.5 g of emulsifier, 4 g of acid and 2 g of PABS heated to 70 ° C, 118 g of BND road bitumen preheated in a separate container to 120 ° C are added with constant stirring 90/130 po and mix until completely homogeneous.

The composition of the emulsion obtained is as follows (% wt.): Bitumen - 59, emulsifier - 0.25, acid - 2, PABS - 1, water - 37.75.

Example 7. To a mixture of 75.5 g of water, 0.5 g of emulsifier, 4 g of acid and 6 g of PABS, heated to 70 ° C, with constant stirring, add 114 g of road BND preheated in a separate container to 120 ° C. 90/130 and mix until completely homogeneous.

The composition of the emulsion obtained is as follows (% wt.): Bitumen - 57, emulsifier - 0.25, acid - 2, PABS - 3, water - 37.75.

Example 8. To a mixture of 75.5 g of water, 0.5 g of emulsifier, 4 g of acid and 10 g of PABS, heated to 70 ° C, with constant stirring, add 110 g of road BND preheated in a separate container to 120 ° C. 90/130 and mix until completely homogeneous.

The composition of the emulsion obtained is as follows (% wt.): Bitumen - 55, emulsifier - 0.25, acid - 2, PABS - 5, water - 37.75.

Example 9. To a mixture of 75.5 g of water, 0.5 g of emulsifier, 4 g of acid and 20 g of PABS, heated to 70 ° C, with constant stirring, add 100 g of road BND preheated in a separate container to 120 ° C. 90/130 and mix until completely homogeneous.

The composition of the emulsion obtained is as follows (% wt.): Bitumen - 50, emulsifier - 0.25, acid - 2, PABS - 10, water - 37.75.

Example 10. To a mixture of 75.5 g of water, 0.5 g of emulsifier, 4 g of acid and 30 g of PABS, heated to 70 ° C, with constant stirring, add 90 g of road BND preheated in a separate container to 120 ° C. 90/130 according to GOST 22245-90 and mix until completely homogeneous.

The composition of the emulsion obtained is as follows (% wt.): Bitumen - 45, emulsifier - 0.25, acid - 2, PABS - 15, water - 37.75.

To compare the proposed samples of emulsions with the prototype, 2 samples of emulsions were prepared according to the prototype (examples 11-12).

Example 11. In 49.7 g of road bitumen (according to GOST 22245-90), heated to a temperature of 110 ° C, 0.3 g of a cationic emulsifier is added with stirring. The aqueous phase is prepared as follows: in 48.5 g of water, 0.5 g of anhydrous heavy pyrolysis resin (TPS) and 1 g of hydrochloric acid are added with stirring, then heated with stirring to 85 ° C, then a mixture of bitumen with an emulsifier having a temperature of 110 ° C is added and mix until completely homogeneous.

The composition of the emulsion obtained is as follows (% wt.): Bitumen - 49.7, emulsifier - 0.3, acid - 1, TPS - 0.5, water - 48.5.

Example 12. In 49.7 g of road bitumen (according to GOST 22245-90), heated to a temperature of 110 ° C, 0.3 g of a cationic emulsifier and 2 g of anhydrous TPS are added with stirring. The aqueous phase is prepared as follows: add 1 g of hydrochloric acid to 47 g of water, mix thoroughly, heat this solution to a temperature of 85 ° C, then add a mixture of bitumen, emulsifier and heavy pyrolysis resin heated to 110 ° C. Stir until completely homogeneous.

The composition of the emulsion obtained is as follows (% wt.): Bitumen - 49.7, emulsifier - 0.3, acid - 1, TPS - 2, water - 47.

Physico-mechanical properties of emulsions prepared according to examples No. 1-No. 12 are shown in table 2, according to which the proposed emulsion surpasses the prototype in terms of resistance to oxidative aging. The change in the depth of penetration of the needle and the elongation of bitumen isolated from the proposed emulsion is 7-11% of the value of this indicator for the source bitumen, against 16-19% for the prototype. For other indicators, the proposed emulsion is not inferior to the prototype.

Table 1
Physico-chemical properties of the polyalkylbenzene resin of Kazanorgsintez JSC (TU 38.10296-83). Indicators Values Density, kg / m ³ 990 Molecular weight 250 The sulfur content,% of the mass. 0.04 Kinematic viscosity, mm ² / s 14.8 - at 50 ° C - at 100 ° C 5,6 Pour point, ° C -12.0 The content of aromatic hydrocarbons,% wt. 66.5 including: - dialkyl substituted 12.5 - polyalkyl substituted 54.0 High molecular weight residue,% mass. 24.5 Fractional composition: The beginning of the boil, ° C 170-180 Boils,% mass .: up to 300 ° C 20.65 up to 370 ° С 75.35 up to 440 ° C 87.0 residue above 440 ° C 13.0 Table 2 - Performance characteristics of bitumen emulsions The composition and properties of bitumen emulsions Offered samples (according to No. of examples) Samples of the prototype (for No. examples) 1 2 3 4 5 6 7 8 nine 10 eleven 12 The content of components in the emulsion,% mass .: bitumen 59 57 55 fifty 45 59 57 55 fifty 45 49.7 49.7 emulsifier 0.125 0.125 0.125 0.125 0.125 0.25 0.25 0.25 0.25 0.25 0.25 0.25 PABS 1 3 5 10 fifteen 1 3 5 10 fifteen - - TPN - - - - - - - - - - 0.5 3 emulsifier neutralizing agent 1 1 1 1 1 2 2 2 2 2 1 1 water 37,875 37,875 37,875 37,875 37,875 37.75 37.75 37.75 37.75 37.75 48.5 47 The decay rate when mixed with quartz sand, g sand / 100 g emulsion 185 175 155 130 100 550 470 400 200 105 100 185 The change in the depth of penetration of the needle for bitumen extracted from the emulsion, compared with the original bitumen,% 7 nine nine 10 eleven nine nine 10 10 10 17 19 The decrease in elongation for bitumen extracted from the emulsion, compared with the original bitumen,% nine 9.5 10 10 10.5 8 9.5 9.5 10.5 eleven 16 eighteen Continuation of table 2 The composition and properties of bitumen emulsions Offered samples (according to No. of examples) Samples of the prototype (for No. examples) 1 2 3 4 5 6 7 8 nine 10 eleven 12 Adhesion to mineral materials,% of area 98 96 100 97 96 98 92 96 100 99 97 100 Conventional viscosity at 20 ° С through the drain hole 3 mm, sec 22 24 26 28 31 33 39 42 56 fifty 23 24 Storage stability by bitumen residue on a sieve 0.14 mm,% after 7 days 0.1 0.1 0.1 0.08 0.09 0.1 0.1 0.1 0.1 0.1 0.1 0.08 after 30 days 0.15 0.2 0.18 0.1 0.15 0.2 0.2 0.1 0.18 0.19 0.2 0.1

Claims (1)

Bitumen emulsion containing bitumen, surfactants such as amines, diamines, polyamines and quaternary ammonium salts as an emulsifier, hydrochloric acid as a reagent to neutralize the emulsifier, water and an additional component, characterized in that as an additional component it contains a polyalkylbenzene resin, which is a by-product the product of the production of isopropylbenzene, with the following components, wt.%: Bitumen 45-59 Emulsifier 0.125-0.25 Reagent for neutralizing emulsifier 1-2 Polyalkylbenzene Resin 1-15 Water Else