JPS60179461A - W/o modified bituminous emulsion - Google Patents

Abstract

PURPOSE:To provide the titled emulsion which does not cause any environmental pollution and has excellent penetrability into the interior of a roadbed, by emulsifying a water phase consisting of an aq. alkaline soln. in an oil phase consisting of a bituminous substance, a resin, rubber, a solvent and a surfactant. CONSTITUTION:40-90wt% bituminous substance (A) (e.g. straight asphalt) is molten by heating at 150-180 deg.C. 1-20wt% thermoplastic high-molecular resin (B) (e.g. an ethylene/vinyl acetate copolymer) and 1-20wt% rubber (C) having a Moony viscosity of 10-100 (e.g. natural rubber latex) are mixed with the molten component A, each quantity being based on that of component A. When the temp. is lowered to 100-130 deg.C, a solvent (D) (e.g. dichloroethylene) in a quantity of 0.25-1.5 times by weight that of component A is added thereto. 0.01- 10.0wt% (based on the entire quantity of oil phase) surfactant (E) having an HLB of 1-18 (e.g. polyoxyethylene alkyl ether) is then added thereto to obtain an oil phase. 10-60wt% aq. alkaline soln. (F) contg. 0.001-5.00wt% metal hydroxide such as Ca(OH)2 is emulsified in 40-90wt% said oil phase.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water-in-oil type modified bitumen emulsion which emulsifies an oil phase consisting of bitumen, a resin, a rubber, a solvent and a surfactant, and an aqueous phase which is an aqueous alkaline solution.

Traditionally, cut-back materials have been the mainstream as prime coats for pavements, but whether their permeability and curing properties are satisfactory, and the risks of pollution due to bad odors, toxicity, and flammability pose risks. Its use began to be limited, and in recent years it has become almost unused.

Therefore, special emulsions and general emulsions for pavements are currently being used in place of cantback materials, which have insufficient performance but have low risk of pollution and disasters and have excellent permeability. Because it is easy to form a precoccal membrane on
Furthermore, there is a drawback that the method requires two steps, including the step of spreading sand or the like to prevent it from adhering to or becoming sticky on the tires of work vehicles.

In addition, if too much is applied9, areas where too much water is applied may soften and flow during high temperatures such as summer and flash onto the asphalt pavement surface, or solidify and become brittle during cold weather such as winter, and are easily destroyed by impacts. It has the disadvantage of being easy to use.

Generally, there are two types of emulsions: oil-in-water emulsions and water-in-oil emulsions. The former is made by dispersing bituminous powder in the form of fine particles in water.The above-mentioned special emulsions and general emulsions for paving belong to this type. Those with ions are also decomposed by contact with aggregate. Due to these properties, although it varies depending on the roadbed moisture content ratio, roadbed compaction density, and weather conditions such as temperature, humidity, and airflow, the reality is that they tend to form a film and do not penetrate into the inside of the roadbed.

The present invention aims to solve the above-mentioned drawbacks, and combines the advantages of cutback materials in terms of physical properties with the advantages of oil-in-water emulsions in terms of pollution and disasters.
By using the latter type of water-in-oil emulsion described above, a modified bitumen emulsion that causes no pollution or disaster and has good permeability into the inside of the roadbed is produced.

The present invention will be explained below.

In the present invention, a water-in-oil type modified bitumen emulsion is obtained by emulsifying an oil phase consisting of a bituminous material, a resin, a rubber, a solvent, and a surfactant, and an aqueous phase of an alkaline aqueous solution.

The present invention will be explained in more detail.

(1) Straight asphalt is the bituminous material.

Semi-prone asphalt, prone asphalt, propane deasphalt composition, natural lake asphalt, light and heavy mineral oils, tars, pitches, etc. are used, or a mixture of two or more of them is used. The proportion of the antebellum is 20 to 90% by weight, particularly preferably 40 to 80% by weight.

(2) The resin is a thermo-OT plastic polymer material such as ethylene/vinyl acetate copolymer, ethylene/acrylate copolymer, ethylene/ethyl acrylate, polyacrylate, polyethylene, polyvinyl acetate, vinyl chloride/vinyl acetate, etc. Polymers, polyvinylidene chloride, styrene/acrylate copolymer, vinyl acetate polymer, acrylic ester/vinyl acetate copolymer, maleate ester/vinyl acetate copolymer, acrylic ester copolymer, chloride It is preferable to use one type or a mixture of two or more types of vinylidene composites, etc., and the amount is preferably 1 to 20% by weight, particularly 1 to 10M, based on the bituminous material.

As the rubber, various synthetic rubbers including natural rubber are used, but its properties (liquid or solid at room temperature, latex type, etc.) may be used, and the Mooney viscosity of the rubber is approximately 10 to IOθ. Very good results were obtained.As natural rubbers, commonly used natural rubber latex, butadiene copolymer rubber, styrene/in-prene copolymer rubber, butyl rubber, and alphine rubber were used.

Styrene/butadiene block polymer rubber, styrene/Inglene block polymer rubber, butadiene rubber, nitrile rubber, ethylene propylene rubber, El) T rubber, polyolefin rubber, etc., or a mixture of two or more of them are used for bituminous materials. 1 to 20% by weight, especially 1 to 1
．． It is preferable to set the weight to 0.

(3) Solvents for dissolving the bituminous material in the oil phase include aromatic hydrocarbons such as triolxolol, 7-based solvents such as methyl ethyl ketone and methyl isobutyl ketone, tricrene, perchloroethylene, trichloroethane, Halogenated hydrocarbon solvents such as tetrachloroethane, ester solvents such as Selonlube acetate, alcohol solvents such as ethanol, glopanol, and octyl alcohol, chlorinated solvents such as dichloroethylene9
One type or a mixture of two or more types of petroleum naphtha etc. is used.

(4) The surfactant is a nonionic surfactant that is liquid or solid at room temperature, and preferably has an ILB value of 1 to 18, particularly 2 to 15. Normally, in order to form a water-in-oil emulsion, it is safe to use an emulsifier with a HL lower than 8; if the HL is 3 or more, an oil-in-water emulsion will be formed.However, in the present invention, An excellent water-in-oil bituminous emulsion was obtained with IIL88-15.The composition of the nonionic surfactant was polyoxyethylene alkyl ether, polyquinoethylene alkylphenol ether, polyoxyethylene nonyl phenol ether, and polyoxyethylene. Derivatives, oxyethylene, oxyprobile/block polymer, nrubitan monolaurate, nrubitan monooleate, sorbitan monopalmitate, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitol fatty acid H-c sterl y Lycerin fatty acid ester, glycerin oleate ester, polyoxyethylene fatty acid ester.

It is one type or a mixture of two or more types of polyoxyethylene alkylamine, polyoxyethylene lauryl ether, polyoxyethylene sorbitan monostearate, etc., and the blending amount is 0.01 to 1000% by weight of the total, In particular, it is preferable to set the weight to 0.03 to 5.00 weight. 1 (5) The metal hydroxide in the alkaline aqueous solution is calcium hydroxide, magnesium hydroxide, barium hydroxide, potassium hydroxide, sodium hydroxide, etc., and the blending amount is o, ooi to 5. 000%, especially 0003
It is preferable to make the rice cake weighing ~1,000 weight.

The product prepared and prepared according to (1) to (5) above is prepared by the following method.

Heat and melt the bituminous material of (1) at 150 to 180°C, add 1 to 10 parts by weight of the resin (rubber) of (2) to 100 parts of the bituminous material, and mix and stir thoroughly to form a homogeneous mixture. When the temperature reaches 100 to 130°C, 25 to 150 parts by weight of the solvent (3) is added to 100 parts of the mixture and stirred to form a uniform mixture.

Add 0.00% of the surfactant (4) to 100% of this mixture.
Add 3 to 5.00 parts by weight while stirring to form a homogeneous mixture. Further, by emulsifying 10 to 60 parts of the alkaline aqueous solution of (5) to 100 parts of this mixture, the modified water-in-oil emulsion of the present invention is obtained.

EXAMPLES The present invention will be explained in more detail with reference to Examples below.

Example 1 Paving asphalt heated and melted at 150 to 180°C (
Straight asphalt penetration 80-100) 1000
．． For 9, add 40 g of ethylene/ethyl acrylate and 40 g of styrene/butadiene block copolymer rubber and stir until homogeneous to dissolve 100 to 1.
When the temperature reaches 30°C, 1000.9' of petroleum naphtha is added and stirred uniformly, and further, 15 g of sorbitan trioleate is added and stirred well to obtain a uniform mixture A1.

Next, 0.5 gt of calcium hydroxide is added to 1000 g of water as an alkaline aqueous solution, heated to 40 to 60° C., and stirred to form a uniform mixture B1.

Above mixture A1 1000.9 and mixture B1 1000
The water-in-oil type modified gauze emulsion of the present invention was obtained by stirring with a homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.) at 35 V for 15 minutes while adding g of the water-in-oil type modified gauze emulsion of the present invention.

Example 2 Paving asphalt heated and melted at 150 to 180°C (
Straight asphalt penetration 60-80) 10009
2 (1
Add 7 to 1 and beat to 1 to remove water and dissolve. When the temperature reached 100-130°C, petroleum naphtha 10100O+- was added and stirred uniformly, and then polyoxyethylene sorbitan monostearate was added. Stir well while adding 10&'r to make a homogeneous mixture A2i.

Next, 0.5 &k of calcium hydroxide is added to 1000 g of water as an alkaline aqueous solution, heated to 40 to 60°C, and stirred to form a uniform mixture B2i.

Mixture 1:12500E to the above mixture A210005'
The water-in-oil type modified bitumen emulsion of the present invention was obtained by stirring with a homomixer at 30 V for 15 minutes while adding .

Example 3 Paving asphalt heated and melted at 150-180°C
(Straight asphalt penetration 2oυ~300) 10
00g of ethylene/vinegar vinyl copolymer 30g
and chloroprene latex converted to solid content is 60.9
Add to ' and stir to remove moisture and dissolve ZZ.
When the temperature reaches 00 to 130℃, petroleum naphtha 1
00 (Add 17'i-c Uniform 7j< Stir, and stir well while adding Nrubitan Monopalmite-420F to obtain a homogeneous mixture A3.

Next, add 1.0.9 i of IJ (1.0.9 i) of water as an alkaline aqueous solution and prepare a homogeneous mixture B3 while stirring.

Mixture +33100 (1) to the above mixture A31000.9
The water-in-oil modified bitumen emulsion of the present invention was obtained by stirring with a homomixer at 40 V for 15 minutes while adding g.

According to the present invention explained above, the conventional prime coat u
The disadvantages of setback phase materials, such as foul odors and toxicity, can be solved by using the above-mentioned solvents. This will prevent ignition.

In addition, unlike oil-in-water type bitumen emulsions, decomposition does not occur due to contact with aggregate, but hardening occurs through evaporation of solvent and water, making it difficult to decompose and harden on the roadbed surface to form a crust. . Therefore, the penetration depth is deep, and it will penetrate until it hardens. These make it difficult to form a film on the surface of the roadbed, so that after penetrating and hardening, it will not stick to the tires of construction workers or the shoes of workers, and there is no risk of it peeling off.

Furthermore, the decomposed and hardened water-in-oil type modified bitumen emulsion of the present invention has improved all the defects of bituminous materials caused by temperature changes such as high and low temperatures, so it softens and flows in the summer.
It does not flash onto the pavement surface, solidifies and becomes brittle in winter, and is not destroyed by impacts.

As described in detail above, the water-in-oil type modified bitumen emulsion of the present invention has excellent actions and effects, and is particularly suitable for use as a prime coat (because of its good permeability, it is suitable for waterproofing the surface of roadbeds). This improves the durability of the construction site, eliminates damage caused by work vehicles during construction, eliminates rainfall, prevents scouring caused by low rainfall, and blocks the rise of capillary water from the roadbed.

In addition, when it is intended for surface treatment, it can rejuvenate aged asphalt pavement due to its good permeability, and extend the life of the pavement itself due to its excellent permeability and permanence. .

Patent applicant: Toa Road Industry Co., Ltd. Agent Patent attorney Takashi Kanekura

Claims (1)

[Claims] 1. A water-in-oil type modified bitumen emulsion, which emulsifies an oil phase consisting of a phosphorus material, a resin, a rubber, a solvent, and a surfactant, and an aqueous phase dissolved in an alkaline aqueous solution. 2. A water-in-oil type modified bitumen emulsion according to claim 1, characterized in that the amount of resin blended is 1 to 20% by weight based on the bituminous material. ~3 A water-in-oil type modified bitumen emulsion according to claim 1, characterized in that the amount of rubber blended is 1 to 20 M bamboo based on the fatigued blue material. 4. The water-in-oil type modified bitumen emulsion according to claim 1, characterized in that the amount of surfactant blended is 0.01 to 1000% of the total weight. 5. Claim 1, characterized in that the amount of metal hydroxide added in the alkaline aqueous solution is between 0001 and 5,000 parts.
-6.1% The water-in-oil modified bitumen emulsion according to claim 1, characterized in that the proportion of bituminous material in the oil phase is 40 to 90% by weight. 7. The water-in-oil modified bitumen emulsion according to claim 1, characterized in that the proportion of the oil phase is 40 to 90% by weight of the total weight.