JPS60199060A - Emulsion-type modified reclaimed additive composition - Google Patents

Abstract

PURPOSE:To obtain the titled composition usable without the need of heating in the manufacturing reclaimed asphalt mixture, resistant to developing flow deformation and/or wear phenomena on road surface, by incorporating a rubber in petroleum-based softening agent followed by emulsification using an emulsifying liquor. CONSTITUTION:In (A) 100pts.wt. of a molten petroleum-based softening agent is gradually incorporated (B) 1-30pts.wt. of a solid or latex-type rubber (pref. with a Mooney viscosity 10-100) to dissolve by heating while stirring, followed by emulsification using (C) an emulsifying liquor prepared by incorporating water with (i) 0.5-5pts.wt. based on 100pts.wt. of the aqueous solution, of surfactant (of anionic, nonionic, cationic, and/or amphoteric type), bentonite, and/or emulsifying auxiliary, and (ii) alkali, acid, salt, and protective colloidal agent, thus obtaining the objective composition.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an emulsion-type modified recycled additive composition for paving recycled asphalt mixtures intended for high-grade pavements, simple pavements, bridge pavements, airport pavements, and the like.

BACKGROUND ART In recent years, with resource and energy conservation efforts, recycled asphalt mixtures from aged or unnecessary waste materials have been carried out.

The maltene fraction (consisting of n-pentane soluble polar fraction, aromatic fraction, and saturated fraction) in the asphalt in the asphalt mixture, which is aged pavement waste, is oxidized or polymerized. As a result, the maltene fraction is relatively insufficient in terms of chemical composition compared to the original asphalt. When this is solidified, the physical properties of the asphalt mixture deteriorate and stress relaxation performance, etc., decreases. To this end, by adding to the asphalt mixture a regenerating additive that has physical properties close to those of the maltene fraction, the asphalt can be restored and regenerated to have physical properties close to those of the original asphalt.

There are two main types of regeneration for asphalt mixtures: central plant methods and on-road methods.

The central plant method is a method of recycling in a special or conventional type of plant, in which the waste asphalt mixture is accumulated in a stockyard, then loosened and classified using crushing equipment or thermal crushing)l Simple or new Supplementary materials such as aggregate, straight asphalt and recycled additives are added and mixed.

In addition, in the on-road method, part or all of the asphalt mixture of the existing pavement is cut on site, and the cutting waste alone or supplementary materials such as aggregate, stray asphalt, asphalt mixture, and recycled additives are used. is added and mixed, and the mixture is spread and compacted.

However, in the central plant method and on-road method using recycled additives, the recycled additives, which are supplementary materials when producing recycled asphalt mixtures, have a viscosity that allows them to be heated and melted and sprayed through a nozzle. In addition, since the viscosity of the supplementary material is lowered to a level that allows it to form a film with the aggregate before use, there is a drawback that extra fuel and steps are required to heat the supplementary material.

In addition, in order to regenerate an aged asphalt mixture with such physical properties, if a regeneration additive mainly consisting of maltene fraction is added in the above-mentioned central plant method or on-road method, the asphalt mixture will flow more easily at high temperatures than a new asphalt mixture. Deformation phenomena are more likely to occur, and wear phenomena are more likely to occur at low temperatures. Therefore, when a recycled asphalt mixture containing recycled additives is used as an asphalt mixture for paving, it is more likely than ordinary asphalt mixtures to cause flow deformation and abrasion phenomena on the road surface when subjected to repeated loads due to automobile traffic. However, it has the disadvantage that it is difficult to maintain a flat road surface for a long time.

The present invention solves the above-mentioned drawbacks, and has a wide range of applications regardless of the degree of aging of the waste asphalt mixture.In addition, when producing a recycled asphalt mixture, the recycled additive material, which is a supplementary material, can be kept at room temperature without heating. The object of the present invention is to provide an emulsion-type modified regenerating additive composition for pavement use.

In order to achieve this object, the present invention has a special mission of adding rubber to a petroleum-based softener and then emulsifying it using an emulsion liquid to obtain an emulsion-type modified recycled additive composition for pavement.

The emulsion-type modified recycled additive composition for pavement according to the present invention will be explained below.

The present invention uses different types of emulsifiers used for emulsification, such as cyanion type petroleum softener emulsions, nonionic type petroleum softener emulsions, cationic type petroleum softener emulsions, and clay type petroleum softener emulsions. It is a water-clear emulsion made by emulsifying a petroleum-based softener in water.

First, the petroleum softener, which is the main component of the present invention, is distilled oil obtained by separating low-boiling fractions from crude oil using an atmospheric distillation column, and distilling the heavy crude oil remaining at the bottom of the atmospheric distillation column under reduced pressure. Moreover, this distillate oil is further classified into shibarafine softeners, naphthenic softeners, and aromatic softeners depending on the type of crude oil, processing steps, and formulation, but all of these can be used in the present invention.

Various synthetic rubbers including natural rubber are used as the rubber, and one type or a mixture of two or more types may be used. The rubber may be in any form such as solid, solution, or latex, and good results are obtained when the rubber has a Mooney viscosity of about 10 to 100.

In addition, chloroprene rubber and styrene ψ are used as synthetic rubbers.
Butadiene copolymer rubber, SfL/7/isoprene copolymer rubber, polyisoprene rubber, polybutadiene rubber, acrylonitrile butadiene copolymer rubber, butyl rubber, alphine rubber.

Styrene/butadiene block polymer rubber, styrene/isoprene block polymer rubber, butadiene rubber, nitrile rubber, ethylene propylene rubber, EPT rubber, polyolefin rubber, etc. are used.

Emulsifiers used for emulsification include anionic surfactants, nonionic surfactants, cationic surfactants, 9 amphoteric surfactants, bentonite, and emulsifying aids, which can be used alone or in aqueous solutions of two or more. 0.2 per 100 parts by weight
By adding ~5.0 parts by weight, it can be used as an emulsion, as well as alkalis and acids.

Add salt and protective colloid.

If the amount of emulsifier used is less than 0.2 parts by weight, the emulsion stability of the paving emulsion regeneration additive composition obtained by emulsification will deteriorate, making it difficult to obtain a homogeneous emulsion with good long-term stability. be. Furthermore, if the amount of emulsifier used is more than 5.0 parts by weight, it will be an economic disadvantage and the emulsion will be very stable when used at room temperature, so curing is required to obtain the reduced petroleum softener. The disadvantage is that it takes a long time.

The composition of the present invention can be obtained as follows.

A method in which a predetermined amount of solid type or latex type rubber is gradually added to a predetermined amount of heated and melted petroleum softener, and the resulting mixture is emulsified using an emulsifying liquid while continuing to stir. One method is to add latex-type rubber to the liquid and emulsify it with a petroleum-based softener.

Next, the present invention will be explained in detail.

First Example To 100 parts by weight of tap water, 1 part by weight of a cationic emulsifier, such as 1 part by weight of fatty diamine, 0.3 parts by weight of concentrated hydrochloric acid, and 0.5 parts by weight of calcium chloride were added and stirred to dissolve the cationic emulsion. Add 10 parts by weight of chloroprene rubber latex in terms of solid content to the emulsion obtained by heating to 5.5i'C and 140 parts by weight of a petroleum softener heated and melted at a temperature of 140 to 160°C. The cationic pavement emulsion-type modified recycled additive composition of the present invention is obtained by stirring to remove moisture, stirring until uniform, and introducing the dissolved mixture into a barrel-type homogenizer to emulsify it. .

Second Example: 1.5 parts by weight of an anionic emulsifier such as beef tallow carboxylic acid soap and 0 parts by weight of caustic soda per 100 parts by weight of tap water.
．． The emulsion obtained by adding 45 parts by weight and stirring and dissolving the anionic emulsion to about 60°C and the emulsion obtained at a temperature of 140°C.
To 140 parts by weight of a petroleum softener heated and melted at ~160°C, add 10 parts by weight of styrene-butadiene copolymer rubber latex in terms of solid content, stir to remove moisture, and make it homogeneous. The anionic emulsion-type modified reclaimed additive composition for pavement according to the present invention is obtained by stirring and dissolving the mixture into a . . . rel type homogenizer and emulsifying it.

Third Example A nonionic emulsifier such as PO was added to 100 parts by weight of tap water.
An emulsion obtained by heating a nonionic emulsion to which 3.0 parts of E-benzyl sulfonate and 0.31 parts of calcium chloride were added and stirred and dissolved, and a temperature of 1.
To 140 parts by weight of a petroleum softener heated and dissolved at 40 to 160°C, 10% of block copolymer rubber (SBS type) was added and stirred until uniformly dissolved.
- The nonionic pavement emulsion-type modified recycled additive composition of the present invention is obtained by introducing it into a rel-type homogenizer and emulsifying it.

As explained above, according to the present invention, by emulsifying the modified regenerating additive composition, it is no longer necessary to apply heat to obtain a viscosity that can be sprayed through a nozzle and a viscosity that can form a film on the aggregate. As a result, the process can be greatly shortened, the construction period can be shortened, and no fuel is required at all.

Furthermore, according to the present invention, unlike the modified recycled additive composition mainly composed of maltene fraction, even under the repeated loading force of an automobile, the flow conversion phenomenon similar to that of a new asphalt mixture occurs, and the abrasion phenomenon may occur. This has the effect of maintaining a flat road surface for a long period of time.

Claims (1)

[Claims] 1. 1 to 30 parts of rubber per 100 parts by weight of petroleum softener
1. An emulsion-type recycled additive composition for pavement, characterized in that it is added in parts by weight and then emulsified and modified using an emulsion liquid.