阅读说明：本技术 一种高性能硫基改性沥青及其制备方法 (High-performance sulfur-based modified asphalt and preparation method thereof ) 是由 何锐 鲁孝松 王振军 陈华鑫 杨博 白永厚 薛成 郭凤俊 段德峰 于 2019-08-28 设计创作，主要内容包括：本发明提供了一种高性能硫基改性沥青及其制备方法,由以下原料制成：基质沥青,硫磺,增容剂,降粘剂和烟雾抑制剂；所述的增容剂由以下原料制成：二硫化二吗啉,氧化镁,乙炔炭黑,二苯甲酰基对醌二肟；所述的降粘剂由以下原料制成：马来酸酐接枝聚乙烯,有机硅油,邻苯二甲酸二辛酯,季戊四醇硬脂酸酯,月桂酸；所述的烟雾抑制剂由以下原料制成：多孔铝硅酸盐矿物材料,硅烷偶联剂,碳酸二烯丙酯,三氧化二砷。本发明提出的硫基改性沥青可显著降低沥青混合料的拌合温度,低至110-130℃；大幅降低硫化氢和二氧化硫的排放量,具体表现在硫化氢浓度不高于0.15ppm,实施过程中无明显异味。(The invention provides high-performance sulfur-based modified asphalt and a preparation method thereof, wherein the high-performance sulfur-based modified asphalt is prepared from the following raw materials: matrix asphalt, sulfur, a compatibilizer, a viscosity reducer and a smoke inhibitor; the compatibilizer is prepared from the following raw materials: dimorpholine disulfide, magnesium oxide, acetylene black, dibenzoyl p-quinone dioxime; the viscosity reducer is prepared from the following raw materials: maleic anhydride grafted polyethylene, silicone oil, dioctyl phthalate, pentaerythritol stearate, and lauric acid; the smoke inhibitor is prepared from the following raw materials: porous aluminosilicate mineral material, silane coupling agent, diallyl carbonate and arsenic trioxide. The sulfur-based modified asphalt provided by the invention can obviously reduce the mixing temperature of the asphalt mixture to 110-130 ℃; greatly reduces the discharge amount of hydrogen sulfide and sulfur dioxide, which is particularly shown in that the concentration of the hydrogen sulfide is not higher than 0.15ppm, and no obvious peculiar smell exists in the implementation process.)

1. The high-performance sulfur-based modified asphalt is characterized by being prepared from the following raw materials: matrix asphalt, sulfur, a compatibilizer, a viscosity reducer and a smoke inhibitor;

the compatibilizer is prepared from the following raw materials: dimorpholine disulfide, magnesium oxide, acetylene black, dibenzoyl p-quinone dioxime;

the viscosity reducer is prepared from the following raw materials: maleic anhydride grafted polyethylene, silicone oil, dioctyl phthalate, pentaerythritol stearate, and lauric acid;

the smoke inhibitor is prepared from the following raw materials: porous aluminosilicate mineral material, silane coupling agent, diallyl carbonate and arsenic trioxide.

2. The high-performance sulfur-based modified asphalt according to claim 1, which is prepared from the following raw materials in parts by weight: 64.1 to 78.1 percent of matrix asphalt, 15.7 to 29.6 percent of sulfur, 3.9 to 4.0 percent of compatibilizer, 1.5 to 1.6 percent of viscosity reducer, 0.7 to 0.8 percent of smoke inhibitor, and the sum of the weight percentages of the raw materials is 100 percent;

the compatibilizer is prepared from the following raw materials in parts by weight: 19 to 23 percent of dimorpholinyl disulfide, 35 to 36 percent of magnesium oxide, 16 to 21 percent of acetylene black, 24 to 26 percent of dibenzoyl-p-quinonedioxime, and the sum of the weight percentages of the raw materials being 100 percent;

the viscosity reducer is prepared from the following raw materials in parts by weight: 30-35% of maleic anhydride grafted polyethylene, 5-7% of organic silicone oil, 9-11% of dioctyl phthalate, 43-46% of pentaerythritol stearate, 5-9% of lauric acid, and the sum of the weight percentages of the raw materials is 100%;

the smoke inhibitor is prepared from the following raw materials in parts by weight: 62 to 70 percent of porous aluminosilicate mineral material, 8 to 9 percent of silane coupling agent, 19 to 27 percent of diallyl carbonate, 3 to 5 percent of arsenic trioxide, and the sum of the weight percentages of the raw materials is 100 percent.

3. The high-performance sulfur-based modified asphalt according to claim 2, which is prepared from the following raw materials in parts by weight: 71.2 percent of matrix asphalt, 22.5 percent of sulfur, 4.0 percent of compatibilizer, 1.6 percent of viscosity reducer and 0.7 percent of smoke inhibitor;

the compatibilizer is prepared from the following raw materials in parts by weight: 19% of dimorpholinyl disulfide, 36% of magnesium oxide, 21% of acetylene black and 24% of dibenzoyl-p-quinonedioxime;

the viscosity reducer is prepared from the following raw materials in parts by weight: 30% of maleic anhydride grafted polyethylene, 7% of organic silicone oil, 11% of dioctyl phthalate, 43% of pentaerythritol stearate and 9% of lauric acid;

the smoke inhibitor is prepared from the following raw materials in parts by weight: 62% of porous aluminosilicate mineral material, 8% of silane coupling agent, 27% of diallyl carbonate and 3% of arsenic trioxide.

4. The high performance sulfur-based modified asphalt of claim 2, prepared from the following raw materials: 64.1 percent of matrix asphalt, 29.6 percent of sulfur, 4.0 percent of compatibilizer, 1.6 percent of viscosity reducer and 0.7 percent of smoke inhibitor;

the compatibilizer is prepared from the following raw materials in parts by weight: 21% of dimorpholinyl disulfide, 35% of magnesium oxide, 18% of acetylene black and 26% of dibenzoyl-p-quinonedioxime;

the viscosity reducer is prepared from the following raw materials in parts by weight: 31% of maleic anhydride grafted polyethylene, 6% of organic silicone oil, 11% of dioctyl phthalate, 45% of pentaerythritol stearate and 7% of lauric acid;

the smoke inhibitor is prepared from the following raw materials in parts by weight: 65% of porous aluminosilicate mineral material, 9% of silane coupling agent, 22% of diallyl carbonate and 5% of arsenic trioxide.

5. The high-performance sulfur-based modified asphalt according to claim 2, which is prepared from the following raw materials in parts by weight: 78.1% of matrix asphalt, 15.7% of sulfur, 3.9% of compatibilizer, 1.5% of viscosity reducer and 0.8% of smoke inhibitor;

the compatibilizer is prepared from the following raw materials in parts by weight: 23% of dimorpholinyl disulfide, 35% of magnesium oxide, 16% of acetylene black and 26% of dibenzoyl-p-quinonedioxime;

the viscosity reducer is prepared from the following raw materials in parts by weight: 35% of maleic anhydride grafted polyethylene, 5% of organic silicone oil, 9% of dioctyl phthalate, 46% of pentaerythritol stearate and 5% of lauric acid;

the smoke inhibitor is prepared from the following raw materials in parts by weight: 70% of porous aluminosilicate mineral material, 8% of silane coupling agent, 19% of diallyl carbonate and 3% of arsenic trioxide.

6. The high-performance sulfur-based modified asphalt as claimed in any one of claims 1 to 5, wherein the porous aluminosilicate mineral material is prepared by uniformly mixing zeolite powder and caustic soda in a mass ratio of 1:0.3 and then calcining the mixture at 500 ℃ for 1 hour.

7. A method for preparing high-performance sulfur-based modified asphalt, which is characterized in that the method adopts the formula of the high-performance sulfur-based modified asphalt as claimed in any one of claims 1 to 5.

8. The method for preparing high-performance sulfur-based modified asphalt according to claim 7, which comprises the following steps:

step one, respectively weighing substrate asphalt sulfur, a compatibilizer, a viscosity reducer and a smoke inhibitor for later use;

step two, placing the viscosity reducer weighed in the step one into a container, heating to 80-90 ℃, and stirring at the speed of 200r/min for 0.5h for later use;

and step three, heating the substrate asphalt weighed in the step one to 130-140 ℃, adding sulfur, shearing for 5min at a speed of 3000r/min in a high-speed shearing machine, sequentially adding a compatibilizer, a viscosity reducer and a smoke inhibitor, and shearing for 1h at a speed of 3000r/min in the high-speed shearing machine to obtain the high-performance sulfur-based modified asphalt.

Technical Field

The invention relates to the technical field of road materials, relates to modified asphalt, and particularly relates to high-performance sulfur-based modified asphalt and a preparation method thereof.

Background

The asphalt pavement is popularized on a large scale on all levels of roads due to the advantages of convenient construction and maintenance, good driving stability and the like, and is gradually developed into the main structural form of the roads in China. When high-grade roads are built, the application of the modified asphalt is more and more extensive in order to meet the requirements on the road performance. At present, common polymer modified asphalt such as SBS modified asphalt can obviously improve the viscosity, toughness and toughness of the asphalt, rubber modified asphalt can improve the high and low temperature performance and the aging resistance, resin modified asphalt can improve the age and the softening point of the asphalt and improve the high temperature performance of the asphalt, but the prominent problems are that SBS modifier is expensive, the compatibility between the rubber and resin modified asphalt and the asphalt is poor, and the asphalt cannot be stored for a long time. Sulfur-modified asphalt, as a representative of inorganic modifier-modified asphalt, has received much attention in the past due to its excellent high and low temperature properties and low cost (even lower than that of base asphalt). However, the sulfur modified asphalt also has the problems that the compatibility of sulfur and asphalt is poor, and hydrogen sulfide gas harms the health of constructors in the production and construction processes.

In order to realize high added value utilization of sulfur resources, improve the performance of sulfur-based modified asphalt, reduce the emission of harmful gas and improve the environmental protection property, the invention provides the environment-friendly high-performance sulfur-based modified asphalt and the preparation method thereof, which improve the compatibility of the sulfur-based modified asphalt, greatly reduce the harmful gas generated during the production, construction and mixing of the asphalt, reduce the temperature of construction and mixing and reduce the production and application costs of the modified asphalt.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide high-performance sulfur-based modified asphalt and a preparation method thereof, which can improve the high added value utilization of sulfur, improve the performance of the sulfur-based modified asphalt and enhance the environmental protection property of the sulfur-based modified asphalt.

In order to solve the technical problems, the invention adopts the following technical scheme:

a high-performance sulfur-based modified asphalt is prepared from the following raw materials: matrix asphalt, sulfur, a compatibilizer, a viscosity reducer and a smoke inhibitor;

the compatibilizer is prepared from the following raw materials: dimorpholine disulfide, magnesium oxide, acetylene black, dibenzoyl p-quinone dioxime;

the viscosity reducer is prepared from the following raw materials: maleic anhydride grafted polyethylene, silicone oil, dioctyl phthalate, pentaerythritol stearate, and lauric acid;

the smoke inhibitor is prepared from the following raw materials: porous aluminosilicate mineral material, silane coupling agent, diallyl carbonate and arsenic trioxide.

Specifically, the feed is prepared from the following raw materials in parts by weight: 64.1 to 78.1 percent of matrix asphalt, 15.7 to 29.6 percent of sulfur, 3.9 to 4.0 percent of compatibilizer, 1.5 to 1.6 percent of viscosity reducer, 0.7 to 0.8 percent of smoke inhibitor, and the sum of the weight percentages of the raw materials is 100 percent;

the compatibilizer is prepared from the following raw materials in parts by weight: 19 to 23 percent of dimorpholinyl disulfide, 35 to 36 percent of magnesium oxide, 16 to 21 percent of acetylene black, 24 to 26 percent of dibenzoyl-p-quinonedioxime, and the sum of the weight percentages of the raw materials being 100 percent;

the viscosity reducer is prepared from the following raw materials in parts by weight: 30-35% of maleic anhydride grafted polyethylene, 5-7% of organic silicone oil, 9-11% of dioctyl phthalate, 43-46% of pentaerythritol stearate, 5-9% of lauric acid, and the sum of the weight percentages of the raw materials is 100%;

the smoke inhibitor is prepared from the following raw materials in parts by weight: 62 to 70 percent of porous aluminosilicate mineral material, 8 to 9 percent of silane coupling agent, 19 to 27 percent of diallyl carbonate, 3 to 5 percent of arsenic trioxide, and the sum of the weight percentages of the raw materials is 100 percent.

The invention also has the following distinguishing technical characteristics:

preferably, the feed is prepared from the following raw materials in parts by weight: 71.2 percent of matrix asphalt, 22.5 percent of sulfur, 4.0 percent of compatibilizer, 1.6 percent of viscosity reducer and 0.7 percent of smoke inhibitor;

the compatibilizer is prepared from the following raw materials in parts by weight: 19% of dimorpholinyl disulfide, 36% of magnesium oxide, 21% of acetylene black and 24% of dibenzoyl-p-quinonedioxime;

the viscosity reducer is prepared from the following raw materials in parts by weight: 30% of maleic anhydride grafted polyethylene, 7% of organic silicone oil, 11% of dioctyl phthalate, 43% of pentaerythritol stearate and 9% of lauric acid;

the smoke inhibitor is prepared from the following raw materials in parts by weight: 62% of porous aluminosilicate mineral material, 8% of silane coupling agent, 27% of diallyl carbonate and 3% of arsenic trioxide.

Preferably, the feed is prepared from the following raw materials: 64.1 percent of matrix asphalt, 29.6 percent of sulfur, 4.0 percent of compatibilizer, 1.6 percent of viscosity reducer and 0.7 percent of smoke inhibitor;

the compatibilizer is prepared from the following raw materials in parts by weight: 21% of dimorpholinyl disulfide, 35% of magnesium oxide, 18% of acetylene black and 26% of dibenzoyl-p-quinonedioxime;

the viscosity reducer is prepared from the following raw materials in parts by weight: 31% of maleic anhydride grafted polyethylene, 6% of organic silicone oil, 11% of dioctyl phthalate, 45% of pentaerythritol stearate and 7% of lauric acid;

the smoke inhibitor is prepared from the following raw materials in parts by weight: 65% of porous aluminosilicate mineral material, 9% of silane coupling agent, 22% of diallyl carbonate and 5% of arsenic trioxide.

Preferably, the feed is prepared from the following raw materials in parts by weight: 78.1% of matrix asphalt, 15.7% of sulfur, 3.9% of compatibilizer, 1.5% of viscosity reducer and 0.8% of smoke inhibitor;

the compatibilizer is prepared from the following raw materials in parts by weight: 23% of dimorpholinyl disulfide, 35% of magnesium oxide, 16% of acetylene black and 26% of dibenzoyl-p-quinonedioxime;

the viscosity reducer is prepared from the following raw materials in parts by weight: 35% of maleic anhydride grafted polyethylene, 5% of organic silicone oil, 9% of dioctyl phthalate, 46% of pentaerythritol stearate and 5% of lauric acid;

the smoke inhibitor is prepared from the following raw materials in parts by weight: 70% of porous aluminosilicate mineral material, 8% of silane coupling agent, 19% of diallyl carbonate and 3% of arsenic trioxide.

Preferably, the porous aluminosilicate mineral material is prepared by uniformly mixing zeolite powder and caustic soda according to the mass ratio of 1:0.3 and then roasting for 1h at 500 ℃.

The invention also provides a preparation method of the high-performance sulfur-based modified asphalt, which adopts the formula of the high-performance sulfur-based modified asphalt as claimed in the above claim.

The method specifically comprises the following steps:

step one, respectively weighing substrate asphalt sulfur, a compatibilizer, a viscosity reducer and a smoke inhibitor for later use;

step two, placing the viscosity reducer weighed in the step one into a container, heating to 80-90 ℃, and stirring at the speed of 200r/min for 0.5h for later use;

and step three, heating the substrate asphalt weighed in the step one to 130-140 ℃, adding sulfur, shearing for 5min at a speed of 3000r/min in a high-speed shearing machine, sequentially adding a compatibilizer, a viscosity reducer and a smoke inhibitor, and shearing for 1h at a speed of 3000r/min in the high-speed shearing machine to obtain the high-performance sulfur-based modified asphalt.

Compared with the prior art, the invention has the following technical effects:

under the action of carbon black and metal oxide MgO, the activity of the vulcanizing agent dibenzoyl p-quinone dioxime can be improved, and the crosslinking degree of sulfur and asphalt is improved. Dimorpholinyl disulfide (DTDM) is a vulcanizing agent and an accelerator, but when the dimorpholinyl disulfide is used alone, the vulcanization is slow, and the dibenzoyl-p-quinone dioxime and the DTDM are compounded, so that the vulcanization reaction can be promoted, and the property of the sulfur-based modified asphalt is stabilized. The addition of the compatibilizer accelerates the process of generating a high-molecular polysulfide compound by the chemical reaction of the elemental sulfur and the asphalt, forms a cross-linked network system with coexisting low-sulfur bonds and C-C bonds, increases the vulcanized cross-linked density, and improves the heat resistance and the fatigue resistance of the modified asphalt; the processing mode has high vulcanization speed, so that the quantity of free elemental sulfur is greatly reduced, the compatibility of the sulfur and the asphalt is improved, and the quantity of generated harmful gas is greatly reduced.

(II) the maleic anhydride grafted polyethylene has the reactiveness and strong polarity of the maleic anhydride and has the excellent processing characteristics of the polyethylene; the organic silicone oil, the lauric acid and the pentaerythritol stearate reduce the high-temperature viscosity of the asphalt; the dioctyl phthalate serving as a plasticizer reduces the high-temperature viscosity of the asphalt and ensures the adhesion of the asphalt and the aggregate. The viscosity reducer disclosed by the invention has the advantages that the heating temperature is reduced, the fluidity is improved, the crosslinking efficiency of a vulcanization reaction is improved, and the emission of harmful gases is reduced; meanwhile, the compatibility of the sulfur and the polymer polysulfide compound with the asphalt is improved, the segregation is reduced, the adhesion effect of the asphalt and stone is improved, and the durability of the mixture is improved.

And (III) the porous aluminosilicate mineral material can adsorb sulfur atom free radicals after being loaded with two activators (diallyl carbonate and arsenic trioxide), so that the generation of harmful gases such as hydrogen sulfide and sulfur dioxide is inhibited, and meanwhile, the silicon-based porous material can adsorb light components in asphalt and improve the high-temperature performance of the asphalt. In addition, the porous aluminosilicate mineral material can also reduce the density difference of each component in the sulfur modified asphalt, reduce the sedimentation and rising rate and inhibit the precipitation of sulfur crystals. The silane coupling agent facilitates the bonding of the silicon-based porous material with the two activators.

(IV) the compatibilizer, the viscosity reducer and the smoke inhibitor are not completely independent in the action on sulfur and asphalt, the action of various modifying additives is mutually promoted, and the viscosity reducer can reduce the high-temperature viscosity of an asphalt system, so that the chemical reaction is easier to perform, and the vulcanization efficiency is improved; the porous aluminosilicate mineral material can also reduce the density difference of each component in the sulfur modified asphalt, reduce the sedimentation and rising rate and inhibit the precipitation of sulfur crystals. The compatibilizer and the viscosity reducer can reduce the mixing temperature, and achieve the effects of reducing the exhaust emission, improving the high-temperature performance of the asphalt and improving the adhesion of the asphalt and the aggregate.

(V) results of a large number of researches and tests show that the sulfur-based modified asphalt provided by the invention can obviously reduce the mixing temperature of the asphalt mixture to 110-130 ℃; greatly reduces the discharge amount of hydrogen sulfide and sulfur dioxide, which is particularly shown in that the concentration of the hydrogen sulfide is not higher than 0.15ppm, and no obvious peculiar smell exists in the implementation process.

The present invention will be explained in further detail with reference to examples.

Detailed Description

In this application, it should be noted that:

the matrix asphalt has penetration degree of 72(0.1mm), softening point of 49 deg.C, 25 deg.C ductility of more than 100cm, 5 deg.C ductility of less than 1cm, and 135 deg.C Brookfield viscosity of 590mPa · s.

Sulphur with fineness of 100 meshes and purity of 99.7 percent.

Dimorpholinyl disulfide (DTDM): molecular formula C₈H₁₆N₂O₂S₂Molecular weight is 236.27, purity is 98%.

Dibenzoyl p-quinone dioxime with molecular formula C₂₀H₁₄N₂O₄Molecular weight is 346.34, purity is 98%.

Magnesium oxide, chemical formula of MgO, molecular weight of 40.30, purity of 99%.

Acetylene black with a purity of 99.7%.

Maleic anhydride grafted polyethylene, used with the trade designation TY 1053H, density: 0.9g/cm³Heat distortion temperature: the grafting rate is 8 percent at 70 ℃, and the number average molecular weight is 3000-8000.

The silicone oil is AK-1000, viscosity is 1000, and flash point is 359 ℃.

Dioctyl phthalate with molecular formula of C₂₄H₃₈O₄Molecular weight is 390.55, purity is 99.9%.

Lauric acid, molecular formula C₁₂H₂₄O₂Molecular weight is 200.32, purity is 99.0%.

Diallyl carbonate of the formula C₇H₁₀O₃Molecular weight is 142.15, purity is 99.5%.

The silane coupling agent is KH550 in type, and the purity is 99%.

Porous aluminosilicate mineral material with molecular formula of Na₁₂Al₁₂Si₁₂O₄₈·27H₂O, chemical name Zeolite sodium aluminosilicate, is a three-dimensional framework compound made from silica and alundum.

Zeolite powder, model 4A.

The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.