A thermoset modified additive for asphalt mixture includes the following raw materials: resin, curing agent, promoter, flow agent, filler and additive, wherein the weight part proportions of the raw materials are: resin 35-70, curing agent 1-35, promoter 0-2.5, flow agent 0-6, filler 20-40 and additive 0-2. The asphalt mixture includes thermoset modified additive for asphalt mixture, matrix asphalt or modified asphalt and mineral aggregate, wherein the weight part proportions of the raw materials are: thermoset modified additive for asphalt mixture 1-5, matrix asphalt 2-8 and mineral aggregate 87-97. The thermoset modified additive for asphalt mixture is prepared by dry process modification technology; the prepared modified additive is powdery, has small particle size, and is easy to disperse in asphalt mixture; and the asphalt mixture prepared from the modified additive has simple operation process and low cost, and can be subjected to continuous production.

Description

17 parts

›This application is a national stage application of…

This application is a national stage application of PCT/CN2014/078228 filed on May 23, 2014, which claims priority of Chinese patent application number 201410003536.9 filed on Jan. 3, 2014. The disclosure of each of the foregoing applications is incorporated herein by reference in its entirety.

›TECHNICAL FIELD

The present invention relates to the road engineering field, in particular; relates to a thermoset modified additive for asphalt mixture, a preparation method thereof and an asphalt mixture prepared using the modified additive.

›BACKGROUND

In recent years, due to the rapid development of traffic and transportation, the traffic volume and vehicle axle load rapidly increase and the travelling, is channelized, which raises higher requirements for the performance of asphalt and asphalt mixture. On the one hand, the asphalt mixture is required to have high-temperature stability, thus not causing rutting; on the other hand, the asphalt is required to have low-temperature crack resistance and fatigue resistance, and prolong the service life of road surface. Especially, the requirement for asphalt binder is increasing due to the development of asphalt pavement technology.

In order to improve usability of asphalt and achieve quality level of engineering requirements, various modified asphalts prepared by methods such as blending and adding admixture, etc, are employed to meet engineering requirements. Although the generalization of modified asphalts improves pavement performance, the thermoplasticity of the asphalt is not changed, therefore, it is difficult to overcome common defects of asphalt pavement.

Thermoset-modified asphalt mixture is prepared from thermosetting resin and graded aggregates. The thermosetting resin includes epoxy resin, polyurethane, phenolic resin, polyester and the like. During modification process, the thermosetting resin is reacted with curing agent in a curing reaction to form an irreversible cured substance which is crosslinked in is network structure. The curing reaction converts thermoplastic asphalt into thermoset asphalt; therefore, the thermoset-modified asphalt has excellent physical and mechanical performances. Generally, the thermoset-modified asphalt mixture is constituted by adding certain stone materials. Due to the fact that the thermosetting resin possesses high strength after curing, it is also called high-strength asphaltic concrete material. The thermosetting resin, which has large rigidity, good flexibility, excellent fatigue resistance and durability, is an ideal material for pavement layer of steel bridge deck, pavement wearing layer and overload traffic road, and has wide application prospect.

At present, the most widely-used material in thermoset modification technology is epoxy asphalt mixture. A conventional modification technology for epoxy asphalt mixture is wet modification technology, comprising firstly preparing epoxy-modified asphalt which generally comprises two components, wherein the first component is epoxy resin and the second component comprises asphalt and other components such as curing agent, etc., the two components are mixed at a certain ratio to form epoxy resin-modified asphalt; and then adding some stone materials into the epoxy-modified asphalt to produce the epoxy asphalt mixture. Such method not only requires complex process, but also generally has difficulty in forming stable modified asphalt when epoxy resin and curing agent are directly added into the asphalt, due to the incompatibility of asphalt and epoxy resin with each other.

Chinese Patent CN101255276A discloses an epoxy asphalt material for road-bridge and the environment-friendly preparation method thereof. Asphalt is modified in the method by grafting reactive functional groups onto the asphalt to improve the compatibility between epoxy resin and asphalt and make asphalt itself become a curing agent for epoxy resin, forming a composite curing agent by combing asphalt with a curing agent and a promoter, and mixing the composite curing agent with epoxy resin to prepare the modified asphalt. Chinese Patent CN1952012A discloses a thermosetting epoxy asphalt material prepared by utilizing a special compatibilizer to improve the compatibility between epoxy resin and asphalt. The method for preparation of the compatibilizer is complex method with a high cost, and is not suitable for use in industry. Furthermore, it is difficult to control the stability of modified asphalt in practical application, thereby making the application complex.

›DESCRIPTION OF THE INVENTION · 1 of 2

One purpose of the present invention is to provide a thermoset modified additive for asphalt mixture, with a view to the technical problems present in current thermoset-modified asphalt. The thermoset modified additive for asphalt mixture according to the present invention is prepared by a simple method, i.e. thermoset dry process modification technology, and can be produced continuously; the prepared asphalt mixture has good stability and is suitable for paving and repairing of steel bridge decks, tunnels, airports, highways and arterial streets.

Another purpose of the present invention is to provide a method for preparation of the thermoset modified additive for asphalt mixture.

The third purpose of the present invention is to provide an asphalt mixture prepared using the modified additive.

For achieving the above-mentioned purposes, the technical solutions of the present invention are:

a thermoset modified additive for asphalt mixture, comprising raw materials: resin, curing agent, promoter, flow agent, filler and additive, wherein the weight part proportions of the raw materials are: resin 35-70, curing agent 1-35, promoter 0-2.5, flow agent 0-6, filler 20-40 and additive 0-2;

Wherein in the weight part proportions of the raw materials, promoter 0-2.5, flow agent 0-6 and additive 0-2 mean that the promoter, flow agent and additive in the raw materials can be optionally added or not.

Wherein the additive is coupling agent or plasticizer, preferably coupling agent.

Especially, the coupling agent is silane coupling agent or titanate coupling agent, preferably silane coupling agent.

Wherein the resin is one or more of epoxy resin, polyester resin, phenolic resin and polyurethane, preferably epoxy resin.

Wherein the curing agent is one or more of amine curing agent, anhydride curing agent, hydrazide curing agent, imidazole curing agent, hydroxyl-terminated phenolic resin, polyester resin: acrylic resin, polyglycidyl ester, hydroxyalkylamide and oxazoline.

Especially, the amine curing, agent is one or more of dicyandiamide, triethylenetetramine and m-phenylenediamine, preferably dicyandiamide

Especially, the anhydride curing agent is one or more of methyl tetrahydrophthalic anhydride, pyromellitic dianhydride, phthalic anhydride, polyazelaic polyanhydride and mug oil anhydride.

Especially, the hydrazide curing agent is one or more of sebacic dihydrazide, adipic dihydrazide and isophthalic dihydrazide, preferably sebacic dihydrazide.

Especially, the imidazole curing agent is one or more of imidazole, 2-methylimidazole and 2-ethyl-4-methylimidazole, preferably 2-methylimidazole.

Especially, the polyglycidyl ester is one or more of triglycidyl isocyanurate, glycidyl methacrylate and diglycidyl ester, preferably triglycidyl isocyanurate.

Especially, the hydrox-yalkylamide is N,N,N′,N′-tetra[β-hydroxyethyl]adipamide or N,N,N′,N′-tetra[β-hydroxypropyl]adipamide, preferably N,N,N′,N′-tetra[β-hydroxyethyl]adipamide.

Especially, the oxazoline is one or more of phenylene dioxazoline, 2-ethyl-2-oxazoline and 2,2-bis(2-oxazoline), preferably phenylene dioxazoline.

Wherein the promoter is one or more of imidazole promoter, tertiary amine promoter or metal oxide, preferably imidazole promoter or tertiary amine promoter, and further preferably tertiary amine promoter.

Especially, the imidazole promoter is one or more of imidazole, 2-methylimidazole and 2-ethyl-4-methylimidazole preferably 2-methylimidazole.

Especially, the tertiary amine promoter is one or more of benzyl dimethylamine, 2,4,6-tri(dimethylaminomethyl)phenol (DMP-30) and N—N-dimethylaniline, preferably DMP-30.

Wherein the flow agent is one or more of acrylate, silicone resin, phenolic resin, amino resin and cellulose acetate butyrate, preferably acrylate.

Wherein the filler is one or more of clay, talc powder, calcium carbonate, barium sulfate and silica.

Another aspect of the present invention is to provide a method for preparation of the thermoset modified additive for asphalt mixture, comprising the following steps:

1) mixing resin, curing agent, promoter, flow agent, filler and additive well, adding the mixture into an extruder for extrusion treatment, so as to obtain an extruded material;

2) subjecting the extruded material to grinding treatment or granulation treatment after it is cooled, so as to obtain a material with particle size of less than 1 mm, i.e. the thermoset modified additive for asphalt mixture;

wherein the temperature for the extrusion treatment is 90-120° C.

Still another aspect of the present invention is to provide an asphalt mixture, comprising the following raw materials: the thermoset modified additive for asphalt mixture, matrix asphalt and mineral aggregate.

Wherein the weight pan proportions of the raw materials are: thermoset modified additive for asphalt mixture 1-5, matrix asphalt 2-8 and mineral aggregate 87-97.

Especially, the weight part proportions of the raw materials are: thermoset modified additive for asphalt mixture 2-3, matrix asphalt 3-4 and mineral aggregate 94.

Wherein the thermoset modified additive for asphalt mixture is prepared according to the following steps:

1) mixing resin, curing agent, promoter, flow agent, filler and additive well, adding the mixture into an extruder for extrusion treatment, so as to obtain an extruded material;

Especially, the temperature for the extrusion treatment is 90-120° C.

Wherein the mineral aggregate consists of aggregate and mineral powder.

Another aspect of the present invention is to provide the use of the asphalt mixture in paving and repairing of steel bridge decks, tunnels, airports, high-grade highways and arterial streets.

Still another aspect of the present invention is to provide a method for preparation of asphalt mixture, comprising the following steps:

(1) mixing the thermoset modified additive for asphalt mixture and preheated aggregate with stirring, and stirring well the mixture to obtain it first mixture material:

›DESCRIPTION OF THE INVENTION · 2 of 2

(2) adding matrix asphalt into the first mixture material, and stirring well to obtain a second mixture material;

(3) adding mineral powder into the second mixed material, and stirring well to obtain the asphalt mixture;

wherein in the steps (1)-(3), the stirring temperature is 130-210° C., and the stirring time is 10-600 s.

The technical solution of the present invention has the following advantages:

1. The thermoset modified additive for asphalt mixture according to the present invention is prepared by dry process modification technology and has simple and reliable application process, the prepared thermoset modified additive is powdery with small particle size and easy to disperse in asphalt mixture.

2. The asphalt mixture proposed M the present invention is prepared by directly mixing thermoset modified additive with mineral aggregate and asphalt, without the step of preparing modified asphalt, and has simple operation process and can be produced continuously

3. The asphalt mixture prepared by the method of the present invention successfully avoids the problems regarding compatibility and thermostability which conventional methods of preparing modified asphalt have, and overcomes the defects of thermostability reduction occurring during long-distance transportation, and dissociation, thermal decomposition and index reduction easily, etc, occurring during heat storage management of modified asphalt on the scene, thus lowering production cost, saving energy and reducing emission.

4. The adding amount of the thermoset modified additive for asphalt mixture prepared according to the present invention can be determined or regulated according to specific engineering conditions by a construction unit, and the asphalt mixture prepared using the thermoset modified additive is suitable for paving and repairing of steel bride decks, tunnels, airports, highways and arterial streets

Specific Mode for Carrying Out the Present Invention

The present invention now is further described with reference to the following examples, and the advantages and characteristics of the present invention would be clearer with the description. However, such examples are only illustrative, and are not intended to constitute any limitation to the scope of the present invention. The skilled person in the art should understand that without deviating from the spirit and scope of the present invention, modifications and replacements can be made to the detail and form of the technical solution of the present invention, however, such modifications and replacements all fall into the protection scope of the present invention.

›Examples11

›Example 1. Preparation of Thermoset Modified Additive for Asphalt Mixture

1) Pretreatment of raw materials

The raw to materials are prepared according to the following weight part proportions:

The raw materials as mentioned above are broken into granules for use;

2) The broken raw materials are added into a high-speed mixer for mixing for 5-15 min, and then added into a twin screw extruder for mixing-extruding treatment to obtain a tablet-like extruded material;

wherein the temperature of feeding section in the extruder is 90° C., and the discharging temperature is 120° C., the thickness of the extruded material is 1 mm.

3) The extruded material is subjected to grinding treatment after it is naturally) cooled, so as to obtain a ground material with particle size of ≤1 mm thermoset modified additive for asphalt mixture.

›Example 2. Preparation of Thermoset Modified Additive for Asphalt Mixture

1) Pretreatment of raw materials

The raw materials are prepared according to the following weight part proportions:

The raw materials as mentioned above are broken into granules for use;

wherein, the temperature of feeding section in the extruder is 90° C. and the discharging temperature is 120° C.; the thickness of the extruded material is 1 mm.

3) The extruded material is subjected to grinding treatment after it is naturally cooled, so as to obtain a ground material with particle size of ≤1 mm, i.e. the thermoset modified additive for asphalt mixture.

›Example 3. Preparation of Thermoset Modified Additive for Asphalt Mixture

1) Pretreatment of raw materials

The raw materials are prepared according to the following weight part proportions:

The raw materials as mentioned above are broken into granules for use;

wherein the temperature of feeding section in the extruder is 90° C., and the discharging temperature is 120° C.; the thickness of the extruded material is 1 mm.

›Example 4. Preparation of Thermoset Modified Additive for Asphalt Mixture

1) pretreatment of raw materials

The raw materials are prepared according to the following weight part proportions:

The raw materials as mentioned above are broken into granules for use;

2) The broken raw materials are added into a high-speed mixer for mixing, for 5-15 min, and then added into a twin screw extruder for mixing-extruding treatment to obtain a tablet-like extruded material;

wherein the temperature of feeding section in the extruder is 90° C., and the discharging temperature is 120° C.; and

the thickness of the extruded material is 1 mm.

›Example 5. Preparation of Thermoset Modified Additive for Asphalt Mixture

1) Pretreatment of raw materials

The raw materials are prepared according to the following weight part proportions:

The raw materials as mentioned above are broken into granules for use;

wherein the temperature of feeding section in the extruder is 90° C., and the discharging temperature is 120° C.; the thickness of the extruded material is 1 mm.

›Example 6. Preparation of Thermoset Modified Additive for Asphalt Mixture

1) Pretreatment of Raw Materials

The raw materials are prepared according to the following weight part proportions:

The raw materials as mentioned above are broken into granules for use;

wherein the temperature of feeding section in the extruder is 90° C., and the discharging temperature is 120° C.; the thickness of the extruded material is 1 mm.

›Example 7. Preparation of Thermoset Modified Additive for Asphalt Mixture

1) Pretreatment of raw materials

The raw materials are prepared according to the following weight part proportions:

The raw materials as mentioned above are broken into granules for use;

wherein the temperature of feeding section in the extruder is 90° C., and the discharging temperature is 120° C.; the thickness of the extruded material is 1 min

›Example 8. Preparation of Thermoset Modified Additive for Asphalt Mixture

1) Pretreatment of raw materials

The raw materials are prepared according to the following weight part proportions:

The raw materials as mentioned above are broken into granules for use;

wherein the temperature of feeding section in the extruder is 90° C., and the discharging temperature is 120° C.; the thickness of the extruded material is 1 mm,

›Example 9. Preparation of Asphalt Mixture

1) The raw materials are prepared according to the following weight part proportions:

The AC-13 type of the mineral aggregate is selected to use in the Examples of the present invention, which consists of aggregate and mineral powder, and the mineral aggregate gradation is shown in Table 1:

The thermoset modified additive for asphalt mixture in the present example is prepared in Example 1.

2) The modified additive for asphalt mixture is added into the aggregate preheated to 165° C. with stirring, and stirred well to obtain a first mixture material; wherein the stirring temperature is 160° C., and the stirring time is 30 s.

3) The matrix asphalt is added into the first mixture material, and stirred well to obtain a second mixture material; wherein the stirring temperature is 160° C., and the stirring time is 90 s.

4) The mineral powder is added into the second mixture material, and stirred well to obtain the asphalt mixture, wherein the stirring temperature is 160° C., and the stirring time is 90 s.

›Example 10. Preparation of Asphalt Mixture

1) The raw materials are prepared according to the following weight pan proportions:

The mineral aggregate used in the present example of the invention is the same as that in Example 9;

The modified additive for asphalt mixture in the present example is prepared in Example 2.

2) The thermoset modified additive for asphalt mixture is added into the aggregate preheated to 135° C. with stirring, and stirred well to obtain a first mixture material; wherein the stirring temperature is 130° C., and the stirring time is 600 s.

3) The matrix asphalt is added into the first mixture material, and stirred well to obtain a second mixture material; wherein the stirring temperature is 130° C., and the stirring time is 600 s.

4) The mineral powder is added into the second mixture material, and stirred well to obtain the asphalt mixture, wherein the stirring temperature is 130° C., and the stirring time is 600 s.

›Example 11. Preparation of Asphalt Mixture

1) The raw materials are prepared according to the following weight part proportions:

The mineral aggregate used in the present example of the invention is the same as that in Example 9;

The modified additive for asphalt mixture in the present example is prepared in Example 2.

2) The thermoset modified additive for asphalt mixture is added into the aggregate preheated to 215° C. with stirring, and stirred well to obtain a first mixture material; wherein the stirring temperature is 210° C., and the stirring time is 10 s.

3) The matrix asphalt is added into the first mixture material, and stirred well to obtain a second mixture material; wherein the stirring temperature is 210V, and the stirring time is 10s.

4) The mineral powder is added into the second mixture material, and stirred well to obtain the asphalt mixture; wherein the stirring temperature is 210° C., and the stirring time is 10 s.

The asphalt mixture prepared according to the present invention can be used for paving and repairing of steel bride decks, tunnels, airports, high-grade highways and arterial streets by conventional paving and repairing methods.

Experimental Example 1

The asphalt mixtures prepared in Examples 9-11 are further prepared into Marshall specimens via conventional methods. The specimens are molded at 160° C., cured at 150° C. for 2 h, and then subjected to Marshall performance test. The test results are shown in Table 2.

It can be seen from Table 2 that each performance index, of the asphalt mixture prepared according to the present invention meets corresponding requirement, the Marshall stability can all be up to above 4 times of the required value, and it can be used for paving and repairing of steel bride decks, tunnels, airports, high-grade highways and arterial streets.

The examples above are only intended to describe the preferable embodiments of the present invention, and not intended to limit the scope of the present invention, and without deviating from the spirit of the present invention, various variants and modifications made by common engineering technicians in the art all fall into the protection scope defined b the claims of the present invention.

›INDUSTRIAL APPLICABILITY

The present invention provides a thermoset modified additive for asphalt mixture, which is prepared by a simple method, i.e., thermosetting dry process modification technology, and can be subjected to continuous production. The prepared asphalt mixture has good stability and is suitable for paving and repairing of steel bride decks, tunnels, airports, highways and arterial streets. The asphalt mixture of the present invention is prepared by directly mixing the thermoset modified additive for asphalt mixture with mineral aggregate and asphalt, without the step of preparing modified asphalt, has simple operation process, and can be subjected to continuous production. The asphalt mixture prepared according to the present invention successfully avoids the problems regarding compatibility and thermostability present in conventional methods for preparing modified asphalt, and overcomes the defects of thermostability reduction occurring during long-distance transportation, and dissociation, thermal decomposition and index reduction easily occurring during heat storage management of modified asphalt on the scene, thus lowering production cost, saving energy and reducing emission.

›Tables in the description — 13

epoxy resin E-12	68
2-methylimidazo1e	0.1
calcium carbonate	28.4
dicyandiamide	3
acrylate	0.5

epoxy resin	50
DMP-30	2.5
barium sulfate	21.5
hydroxyl-terminated phenolic resin	25
acrylate	1
silane coupling agent	0.1

epoxy resin E12	70
acrylate	0.8
silane coupling agent	0.1
sebacic dihydrazide	5.3
talc powder	23.9

epoxy resin E-12	35
acrylate	0.8
silane coupling agent	0.15
polyester resin	35
silica	29.2

polyester resin	65
acrylate	6
silane coupling agent	0.1
triglycidyl isocyanurate	6
clay	23

epoxy resin	56.5
DMP-30	0.5
silane coupling agent	2
2-methylimidazole	1
calcium carbonate	40

epoxy resin	45.5
2-methylimidazole	2.5
calcium carbonate	20
acrylic resin	30
acrylate	2

epoxy resin	40
acrylate	5
hydroxyl-terminated phenolic resin	25
calcium carbonate	30

thermoset modified additive for asphalt mixture	2
mineral aggregate	94
matrix asphalt	4

TABLE 1 — gradation composition of mineral aggregate

mesh (mm)	16	13.2	9.5	4.75	2.36	1.18	0.6	0.3	0.15	0.075
Sieving rate (%)	100	95	76.5	53	37	26.5	19	14	10	6

thermoset modified additive for asphalt mixture	2
mineral aggregate	94
matrix asphalt	4

thermoset modified additive for asphalt mixture	3
mineral aggregate	94
matrix asphalt	3

TABLE 2 — Results of Marshall performance test VMA

	VV	(Voids in	VFA	MS	FL
	(Volume	Mineral	(Voids	(Marshall	(flow
	of Air	Aggregate)/	Filled with	Stability)/	value)/
	Voids)/%	%	Asphalt)/%	kN	mm
Technical	4-6	≥14	65-75	≥8	1.5-4
standard
Example 9	5.7	16.8	66.2	36	2.1
Example 10	5.32	16.4	67.7	48.36	2.33
Example 11	5.97	17.01	65.1	77.82	1.6

1 of 17 part labels are ours — the grant heads the rest

Claims as granted

15 claims

Classifications

16 codes

IPC · International Patent Classification

Section C — Chemistry; metallurgy

C08K5/3445
C08L75/00
C08G59/50
C08L75/04
C08L67/00
C08K5/315
C08K5/3492
C08L95/00
C08K3/34
C08K5/20
C08K3/26
C08L63/00
C08K5/101

Section E — Fixed constructions

E01D22/00
E01C7/30
E01C23/00

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