CN102604396A - Synergic flame retardance asphalt material and preparation method thereof - Google Patents

Abstract

The invention discloses a synergistic flame-retardant asphalt material, which is characterized in that it is prepared by mixing the following raw materials in parts by weight: 100 parts of asphalt, 0.2-40 parts of metal hydroxide, and 0.1-30 parts of layered silicate; The pitch is one or more of petroleum pitch, rock pitch and coal pitch, and the metal hydroxide is aluminum hydroxide and/or magnesium hydroxide. The invention also provides a preparation method of the synergistic flame-retardant asphalt material. The invention utilizes the synergistic flame retardant effect of metal hydroxide and layered silicate to carry out nano-composite modification on asphalt, which is a green, non-toxic and environment-friendly method compared with ordinary organic flame retardants (such as halogen-containing ones). Type flame retardant technology. The flame-retardant asphalt material has excellent road performance and meets the requirements of use. The storage stability can reach more than one year, and the temperature sensitivity and aging resistance are obviously higher than ordinary asphalt.

Description

A synergistic flame-retardant asphalt material and its preparation method

technical field

The invention belongs to the technical field of flame retardant materials, and in particular relates to a synergistic flame retardant asphalt material and a preparation method thereof.

Background technique

Asphalt concrete pavement has the advantages of comfortable driving, low noise, good anti-skid performance, high traffic safety, and easy maintenance. It is gradually favored by designers and builders in highway construction. However, due to the flammability of asphalt, when a fire occurs in a tunnel, especially after a fire occurs in an oil-immersed state, asphalt burning will produce a large amount of toxic smoke, which will easily cause heavy losses to personnel and property. Therefore, improving the flame retardant performance of asphalt has very important practical significance for improving the traffic safety performance in tunnels and eliminating hidden dangers of traffic accidents.

Commonly used flame retardants are halogen-based, phosphorus-based, nitrogen-based, antimony compounds, boron compounds, magnesium compounds, aluminum compounds, etc. Most of the organic flame retardants (such as halogen-containing compounds) have better flame retardant effects. However, it will release toxic and irritating gas at high temperature, which not only puts forward high requirements for the production and construction of hot mix asphalt mixture, but also is very harmful to the health of construction workers and personnel in the future operation process. At present, flame retardants are developing in the direction of halogen-free, low toxicity and low smoke. Among them, metal hydroxides, as environmentally friendly flame retardants, have the characteristics of flame retardancy, smoke suppression, and reduction of secondary pollution, and have been widely used. However, there are certain disadvantages when metal hydroxides are used as flame retardants, for example, they need to be added in a relatively high amount to show an obvious flame retardant effect.

Contents of the invention

The technical problem to be solved by the present invention is to provide a green, non-toxic and environment-friendly synergistic flame-retardant asphalt material for the above-mentioned deficiencies in the prior art. The road performance of this material is excellent, which meets the requirements of use. The storage stability can reach more than one year, and the temperature sensitivity and aging resistance are obviously higher than ordinary asphalt.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: a synergistic flame-retardant asphalt material, which is characterized in that it is made by mixing the following raw materials in parts by weight: 100 parts of asphalt, 0.2-40 parts of metal hydroxide, layer 0.1-30 parts of silicate; the asphalt is one or more of petroleum asphalt, rock asphalt and coal tar pitch, and the metal hydroxide is aluminum hydroxide and/or magnesium hydroxide.

The aforementioned synergistic flame-retardant asphalt material is prepared by mixing the following raw materials in parts by weight: 100 parts of asphalt, 3-20 parts of metal hydroxide, and 1-10 parts of layered silicate.

The aforementioned synergistic flame-retardant asphalt material is prepared by mixing the following raw materials in parts by weight: 100 parts of asphalt, 5-8 parts of metal hydroxide, and 2-4 parts of layered silicate.

The aforementioned synergistic flame-retardant asphalt material is prepared by mixing the following raw materials in parts by weight: 100 parts of asphalt, 6 parts of metal hydroxide, and 3 parts of layered silicate.

In the aforementioned synergistic flame-retardant asphalt material, the phyllosilicate is a natural phyllosilicate or an organic phyllosilicate.

In the aforementioned synergistic flame-retardant asphalt material, the natural phyllosilicate is one or more of montmorillonite, rectorite, sepiolite and kaolin minerals.

The aforementioned synergistic flame-retardant asphalt material, the organic phyllosilicate is a phyllosilicate modified by conventional methods, such as chlorinated organic reagent hexadecyl trimethyl Ammonium, cetyltrimethylammonium bromide, sodium dodecylsulfonate or sodium dodecylbenzenesulfonate organically modified phyllosilicate.

The present invention also provides a method for preparing a synergistic flame-retardant asphalt material, which is characterized in that the method is as follows: heat the asphalt to 120°C-160°C and place it in a high-speed shearing instrument, and set the temperature at a speed of 1000rpm-6000rpm Stir the asphalt under the same temperature and stirring conditions; then, under the same temperature and stirring conditions, add the metal hydroxide with a particle size of not more than 200 mesh into the high-speed shearer equipped with asphalt at a uniform speed within 1min to 3min, and continue to stir for 10min to 30min; Finally, under the same temperature and stirring conditions, add the layered silicate with a particle size of no more than 200 mesh into the high-speed shearer at a constant speed within 1min to 3min, continue to stir for 1h to 2h, and after cooling at room temperature, the synergistic flame retardant asphalt is obtained Material.

The parts by weight may be weight measurement units such as gram, liang, jin, kilogram, ton.

Compared with the prior art, the present invention has the following advantages:

1. The present invention utilizes the synergistic flame retardant effect of metal hydroxide and layered silicate to carry out nanocomposite modification on asphalt. Compared with common organic flame retardants (such as halogen-containing), it is a green and non-toxic Toxic and environmentally friendly flame retardant technology.

2. The metal hydroxide and layered silicate added in the present invention have a significant synergistic flame retardant effect on asphalt, far exceeding the flame retardant effect of a single flame retardant, and can make the flame retardant at a relatively low addition amount Performance is greatly improved. In addition, since layered silicate is a nano-modifier, it can improve other application properties of asphalt. The obtained flame-retardant asphalt material has excellent road performance and meets the requirements of use. The storage stability can reach more than one year, and the temperature sensitivity and aging resistance are obviously higher than ordinary asphalt.

3. The preparation method of the present invention is simple, low in cost, mild in conditions and does not require special equipment.

The technical solutions of the present invention will be further described in detail below through examples.

Detailed ways

Example 1

The synergistic flame-retardant asphalt material of this embodiment is made by mixing the following raw materials: 100kg of asphalt, 40kg of metal hydroxide, and 0.1kg of layered silicate; the asphalt is petroleum asphalt, and the metal hydroxide is hydroxide aluminum, and the layered silicate is natural sepiolite.

The preparation method of the synergistic flame-retardant asphalt material in this example is: heat the asphalt to 150°C and place it in a high-speed shearer, and stir the asphalt at a speed of 1000 rpm; then, under the same temperature and stirring conditions, , add the metal hydroxide with a particle size of not more than 200 mesh into the high-speed shearer equipped with asphalt at a constant speed within 3 minutes, continue to stir for 10 minutes, and after cooling at room temperature, a synergistic flame-retardant asphalt material is obtained.

The flame-retardant asphalt material of this embodiment has excellent road performance and meets the requirements of use, and the storage stability can reach more than one year, and the temperature sensitivity and aging resistance are obviously higher than ordinary asphalt.

Example 2

This embodiment is the same as Example 1, wherein the difference is that the pitch is rock pitch or coal pitch, or two or three of petroleum pitch, rock pitch and coal pitch; the metal hydroxide is Magnesium hydroxide or magnesium hydroxide and aluminum hydroxide; The layered silicate is natural rectorite, natural montmorillonite or natural kaolin minerals, or natural montmorillonite, natural rectorite, natural sepiolite and At least two of the naturally occurring kaolin minerals.

The preparation method of the synergistic flame retardant asphalt material of this example is the same as that of Example 1.

The flame-retardant asphalt material of this embodiment has excellent road performance and meets the requirements of use, and the storage stability can reach more than one year, and the temperature sensitivity and aging resistance are obviously higher than ordinary asphalt.

Example 3

The synergistic flame-retardant asphalt material of this embodiment is made by mixing the following raw materials in parts by weight: 100 kg of asphalt, 0.2 kg of metal hydroxide, and 30 kg of layered silicate; the asphalt is rock asphalt, and the metal hydroxide is magnesium hydroxide, and the layered silicate is natural montmorillonite.

The preparation method of the synergistic flame-retardant asphalt material in this embodiment is: heat the asphalt to 120°C and place it in a high-speed shearer, and stir the asphalt at a speed of 6000rpm; then, under the same temperature and stirring conditions, , add the metal hydroxide with a particle size of not more than 200 mesh into the high-speed shearer equipped with asphalt at a constant speed within 1 minute, and continue to stir for 30 minutes; finally, under the same temperature and stirring conditions, layer the The silicate was added into the high-speed shearer at a constant speed within 3 minutes, continued to stir for 1 hour, and after cooling at room temperature, a synergistic flame-retardant asphalt material was obtained.

The flame-retardant asphalt material of this embodiment has excellent road performance and meets the requirements of use, and the storage stability can reach more than one year, and the temperature sensitivity and aging resistance are obviously higher than ordinary asphalt.

Example 4

This embodiment is the same as Example 3, wherein the difference is that the pitch is petroleum pitch or coal pitch, or two or three of petroleum pitch, rock pitch and coal pitch; the metal hydroxide is Aluminum hydroxide or aluminum hydroxide and magnesium hydroxide; The layered silicate is natural rectorite, natural sepiolite or natural kaolin minerals, or natural montmorillonite, natural rectorite, natural sepiolite and At least two of the naturally occurring kaolin minerals.

The preparation method of the synergistic flame-retardant asphalt material in this example is the same as that in Example 3.

The flame-retardant asphalt material of this embodiment has excellent road performance and meets the requirements of use, and the storage stability can reach more than one year, and the temperature sensitivity and aging resistance are obviously higher than ordinary asphalt.

Example 5

The synergistic flame-retardant asphalt material of this embodiment is made by mixing the following raw materials in parts by weight: 100 kg of asphalt, 3 kg of metal hydroxide, and 1 kg of layered silicate; the asphalt is coal tar pitch, and the metal hydroxide is Magnesium hydroxide and aluminum hydroxide, the layered silicate is organic montmorillonite.

The preparation method of the synergistic flame-retardant asphalt material in this embodiment is: heat the asphalt to 160°C, place it in a high-speed shearer, and stir the asphalt at a speed of 4000rpm; then, under the same temperature and stirring conditions, , add the metal hydroxide with a particle size of no more than 200 mesh into the high-speed shearer equipped with asphalt at a constant speed within 2 minutes, and continue to stir for 20 minutes; finally, under the same temperature and stirring conditions, layer the The silicate was added into the high-speed shearer at a constant speed within 1 min, and the stirring was continued for 2 h. After cooling at room temperature, a synergistic flame-retardant asphalt material was obtained.

The flame-retardant asphalt material of this embodiment has excellent road performance and meets the requirements of use, and the storage stability can reach more than one year, and the temperature sensitivity and aging resistance are obviously higher than ordinary asphalt.

Example 6

The present embodiment is the same as Example 5, except that the asphalt is petroleum pitch or rock pitch, or two or three of petroleum pitch, rock pitch and coal tar pitch; the metal hydroxide is aluminum hydroxide or magnesium hydroxide; the layered silicate is one or more of natural montmorillonite, natural rectorite, natural sepiolite and natural kaolin minerals, or organic rectorite, organic sea pumice or organic kaolin minerals, or at least two of organic montmorillonite, organic rectorite, organic sepiolite and organic kaolin minerals.

The preparation method of the synergistic flame-retardant asphalt material in this example is the same as that in Example 5.

The flame-retardant asphalt material of this embodiment has excellent road performance and meets the requirements of use, and the storage stability can reach more than one year, and the temperature sensitivity and aging resistance are obviously higher than ordinary asphalt.

Example 7

The synergistic flame-retardant asphalt material of this embodiment is made by mixing the following raw materials in parts by weight: 100 kg of asphalt, 20 kg of metal hydroxide, and 10 kg of layered silicate; the asphalt is petroleum asphalt and rock asphalt, and the metal hydrogen The oxide is magnesium hydroxide, and the layered silicate is natural montmorillonite, natural rectorite, natural sepiolite and natural kaolin minerals.

The preparation method of the synergistic flame-retardant asphalt material in this embodiment is: heat the asphalt to 130°C and place it in a high-speed shearer, and stir the asphalt at a speed of 5000 rpm; then, under the same temperature and stirring conditions, , add the metal hydroxide with a particle size of not more than 200 mesh into the high-speed shearer equipped with asphalt at a constant speed within 3 minutes, and continue to stir for 20 minutes; finally, under the same temperature and stirring conditions, layer the The silicate was added to the high-speed shearer at a constant speed within 3 minutes, and the stirring was continued for 1.5 hours. After cooling at room temperature, a synergistic flame-retardant asphalt material was obtained.

The flame-retardant asphalt material of this embodiment has excellent road performance and meets the requirements of use, and the storage stability can reach more than one year, and the temperature sensitivity and aging resistance are obviously higher than ordinary asphalt.

Example 8

This embodiment is the same as Example 7, except that the bitumen is one or three of petroleum pitch, rock pitch and coal pitch, or petroleum pitch and coal pitch, or rock pitch and coal pitch ; The metal hydroxide is aluminum hydroxide or aluminum hydroxide and magnesium hydroxide; The layered silicate is at most three of natural montmorillonite, natural rectorite, natural sepiolite and natural kaolin minerals , or one or more of organic montmorillonite, organic rectorite, organic sepiolite and organic kaolinite minerals.

The preparation method of the synergistic flame-retardant asphalt material of this example is the same as that of Example 7.

The flame-retardant asphalt material of this embodiment has excellent road performance and meets the requirements of use, and the storage stability can reach more than one year, and the temperature sensitivity and aging resistance are obviously higher than ordinary asphalt.

Example 9

The synergistic flame-retardant asphalt material of this embodiment is made by mixing the following raw materials in parts by weight: 100 kg of asphalt, 5 kg of metal hydroxide, and 4 kg of layered silicate; The metal hydroxides are magnesium hydroxide and aluminum hydroxide, and the phyllosilicates are organic montmorillonite, organic rectorite, organic sepiolite and organic kaolin minerals.

The preparation method of the synergistic flame-retardant asphalt material in this embodiment is: heat the asphalt to 130°C and place it in a high-speed shearer, and stir the asphalt at a speed of 5000 rpm; then, under the same temperature and stirring conditions, , add the metal hydroxide with a particle size of not more than 200 mesh into the high-speed shearer equipped with asphalt at a constant speed within 3 minutes, and continue to stir for 20 minutes; finally, under the same temperature and stirring conditions, layer the The silicate was added to the high-speed shearer at a constant speed within 3 minutes, and the stirring was continued for 1.5 hours. After cooling at room temperature, a synergistic flame-retardant asphalt material was obtained.

The flame-retardant asphalt material of this embodiment has excellent road performance and meets the requirements of use, and the storage stability can reach more than one year, and the temperature sensitivity and aging resistance are obviously higher than ordinary asphalt.

Example 10

This embodiment is the same as Example 9, except that the pitch is one or both of petroleum pitch, rock pitch and coal tar pitch; the metal hydroxide is aluminum hydroxide or magnesium hydroxide; The layered silicate is one or more of natural montmorillonite, natural rectorite, natural sepiolite and natural kaolin minerals, or organic montmorillonite, organic rectorite, organic sepiolite and organic Up to three of the kaolin minerals.

The preparation method of the synergistic flame-retardant asphalt material in this example is the same as that in Example 9.

The flame-retardant asphalt material of this embodiment has excellent road performance and meets the requirements of use, and the storage stability can reach more than one year, and the temperature sensitivity and aging resistance are obviously higher than ordinary asphalt.

Example 11

The synergistic flame-retardant asphalt material of this embodiment is made by mixing the following raw materials in parts by weight: 100 kg of asphalt, 8 kg of metal hydroxide, and 2 kg of layered silicate; the asphalt is rock asphalt and coal tar pitch, and the metal hydrogen The oxides are magnesium hydroxide and aluminum hydroxide, and the phyllosilicates are organic montmorillonite and organic kaolin minerals.

The preparation method of the synergistic flame-retardant asphalt material in this example is: heat the asphalt to 120°C and place it in a high-speed shearer, and stir the asphalt at a speed of 3000rpm; then, under the same temperature and stirring conditions, , add the metal hydroxide with a particle size of no more than 200 mesh into the high-speed shearer equipped with asphalt at a constant speed within 2 minutes, and continue to stir for 30 minutes; finally, under the same temperature and stirring conditions, layer the The silicate was added into the high-speed shearer at a constant speed within 2 minutes, continued to stir for 2 hours, and cooled at room temperature to obtain a synergistic flame-retardant asphalt material.

The flame-retardant asphalt material of this embodiment has excellent road performance and meets the requirements of use, and the storage stability can reach more than one year, and the temperature sensitivity and aging resistance are obviously higher than ordinary asphalt.

Example 12

This embodiment is the same as Example 11, except that the bitumen is one or three of petroleum pitch, rock pitch and coal tar pitch, or petroleum pitch and rock pitch, or petroleum pitch and coal pitch ; The metal hydroxide is aluminum hydroxide or magnesium hydroxide; The layered silicate is one or more of natural montmorillonite, natural rectorite, natural sepiolite and natural kaolin minerals, or One, three or four of organic montmorillonite, organic rectorite, organic sepiolite and organic kaolin minerals, or two of organic rectorite, organic sepiolite and organic kaolin minerals, or Organic montmorillonite and organic rectorite, or organic montmorillonite and organic sepiolite.

The preparation method of the synergistic flame-retardant asphalt material in this example is the same as that in Example 11.

The flame-retardant asphalt material of this embodiment has excellent road performance and meets the requirements of use, and the storage stability can reach more than one year, and the temperature sensitivity and aging resistance are obviously higher than ordinary asphalt.

Example 13

The synergistic flame-retardant asphalt material of this embodiment is made by mixing the following raw materials in parts by weight: 100 kg of asphalt, 6 kg of metal hydroxide, and 3 kg of layered silicate; the asphalt is coal tar pitch, and the metal hydroxide is Aluminum hydroxide, the layered silicate is natural sepiolite.

The preparation method of the synergistic flame-retardant asphalt material in this embodiment is: heat the asphalt to 160°C and place it in a high-speed shearer, and stir the asphalt at a speed of 6000rpm; then, under the same temperature and stirring conditions, , add the metal hydroxide with a particle size of no more than 200 mesh into the high-speed shearer equipped with asphalt at a constant speed within 1 minute, and continue to stir for 20 minutes; finally, under the same temperature and stirring conditions, layer the The silicate was added to the high-speed shearer at a constant speed within 1 min, and the stirring was continued for 1.5 h. After cooling at room temperature, a synergistic flame-retardant asphalt material was obtained.

The flame-retardant asphalt material of this embodiment has excellent road performance and meets the requirements of use, and the storage stability can reach more than one year, and the temperature sensitivity and aging resistance are obviously higher than ordinary asphalt.

Example 14

This embodiment is the same as Example 13, wherein the difference is that the asphalt is petroleum asphalt or rock asphalt, or two or three of petroleum asphalt, rock asphalt and coal tar pitch; the metal hydroxide is Magnesium hydroxide or magnesium hydroxide and aluminum hydroxide; The layered silicate is natural montmorillonite, natural rectorite or natural kaolin minerals, or natural montmorillonite, natural rectorite, natural sepiolite and At least two of natural kaolin minerals, or one or more of organic montmorillonite, organic rectorite, organic sepiolite and organic kaolin minerals.

The preparation method of the synergistic flame-retardant asphalt material in this example is the same as that in Example 13.

The flame-retardant asphalt material of this embodiment has excellent road performance and meets the requirements of use, and the storage stability can reach more than one year, and the temperature sensitivity and aging resistance are obviously higher than ordinary asphalt.

The present invention uses an oxygen index measuring instrument to carry out the oxygen index of the flame-retardant asphalt material in embodiment 1, embodiment 3, embodiment 5, embodiment 7, embodiment 9, embodiment 11 and embodiment 13, and common asphalt respectively Determination, the results are shown in the table below:

Table 1 Oxygen index comparison table between the asphalt material of the singular embodiment of the present invention and common asphalt

It can be seen from the above table that the oxygen index of the flame-retardant asphalt material of the present invention is obviously higher than that of ordinary asphalt materials, and the flame-retardant performance is high, which belongs to the flame-retardant material.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any way. All simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the invention still belong to the technical solution of the present invention. within the scope of protection.

Claims (8)

1. a cooperative flame retardant bituminous material is characterized in that, is processed by the raw materials mix of following weight part: 100 parts of pitches, 0.2～40 part of metal hydroxides, 0.1～30 part of layered silicate; Said pitch is one or more in petroleum pitch, rock asphalt and the coal-tar pitch, and said metal hydroxides is white lake and/or Marinco H.

2. a kind of cooperative flame retardant bituminous material according to claim 1 is characterized in that, is processed by the raw materials mix of following weight part: 100 parts of pitches, 3～20 parts of metal hydroxidess, 1～10 part of layered silicate.

3. a kind of cooperative flame retardant bituminous material according to claim 2 is characterized in that, is processed by the raw materials mix of following weight part: 100 parts of pitches, 5～8 parts of metal hydroxidess, 2～4 parts of layered silicates.

4. a kind of cooperative flame retardant bituminous material according to claim 3 is characterized in that, is processed by the raw materials mix of following weight part: 100 parts of pitches, 6 parts of metal hydroxidess, 3 parts of layered silicates.

5. according to the described a kind of cooperative flame retardant bituminous material of arbitrary claim in the claim 1 to 4, it is characterized in that layered silicate is natural layered silicate or organic layered silicate.

6. a kind of cooperative flame retardant bituminous material according to claim 5 is characterized in that, said natural layered silicate is one or more in smectite, rectorite leng, sepiolite and the kaolin mineral.

7. a kind of cooperative flame retardant bituminous material according to claim 5 is characterized in that, said organic layered silicate is the layered silicate behind conventional method organic modification.

8. method for preparing like the said cooperative flame retardant bituminous material of arbitrary claim in the claim 1 to 4; It is characterized in that; This method is: pitch heating is placed in the high speed shear appearance for 120 ℃～160 ℃, is under the condition of 1000rpm～6000rpm pitch to be stirred at rotating speed; Then under same temperature and agitation condition, particle diameter is not more than 200 purpose metal hydroxidess in 1min～3min, at the uniform velocity adds and be equipped with in the bituminous high speed shear appearance, continue to stir 10min～30min; Under same temperature and agitation condition, particle diameter is not more than 200 purpose layered silicates in 1min～3min, at the uniform velocity adds in the high speed shear appearance at last, continue to stir 1h～2h, after the room temperature cooling, obtain the cooperative flame retardant bituminous material.