阅读说明：本技术 一种耐老化沥青改性剂及其制备方法及耐老化沥青 (A kind of ageing-resistant asphalt modifier and preparation method thereof and ageing-resistant pitch ) 是由 刘思楠 谷坤鹏 陈克伟 聂亚楠 徐志祥 钟赛 左元凯 于 2019-08-01 设计创作，主要内容包括：本申请的目的是提供一种耐老化沥青改性剂及其制备方法及耐老化沥青,所述耐老化沥青改性剂由质量百分比为0％～30％的水滑石和质量百分比为70％～100％的水杨酸根插层水滑石组成,其中,水杨酸根插层水滑石的制备以水滑石和水杨酸为原料,水滑石和水杨酸的摩尔比为1：4。本申请得到的耐老化沥青改性剂成本低廉,制备简单,且在对沥青改性后能显著提高沥青的抗老化性能,本申请使用的耐老化沥青改性剂对沥青改性后能提高沥青的抗老化能力,具备良好的应用前景。(The purpose of the application is to provide a kind of ageing-resistant asphalt modifier and preparation method thereof and ageing-resistant pitch, the salicylate intercalated houghite that the hydrotalcite and mass percent that the ageing-resistant asphalt modifier is 0%~30% by mass percent are 70%~100% forms, wherein, using hydrotalcite and salicylic acid as raw material, hydrotalcite and salicylic molar ratio are 1:4 for the preparation of salicylate intercalated houghite.The ageing-resistant asphalt modifier that the application obtains is low in cost, preparation is simple, and the anti-aging property of pitch can be significantly improved after to asphalt modification, ageing-resistant asphalt modifier used in this application has good application prospect to the ageing resistance that can improve pitch after asphalt modification.)

1. a kind of ageing-resistant asphalt modifier, which is characterized in that the ageing-resistant asphalt modifier by mass percent be 0%~ The salicylate intercalated houghite that 30% the first hydrotalcite and mass percent is 70%~100% forms.

2. ageing-resistant asphalt modifier according to claim 1, which is characterized in that the ageing-resistant asphalt modifier is by matter Percentage is measured as 5%~25% the first hydrotalcite and 75%~95% salicylate intercalated houghite composition.

3. ageing-resistant asphalt modifier according to claim 1, which is characterized in that the ageing-resistant asphalt modifier is by matter Percentage is measured as 10%~20% the first hydrotalcite and 80%~90% salicylate intercalated houghite composition.

4. ageing-resistant asphalt modifier according to claim 1, which is characterized in that first hydrotalcite is magnalium carbonic acid Root hydrotalcite, specific molecular formula are [Mg_1-XAl_X(OH)₂]^X+[(CO₃)_X/2]^X-·mH₂O, 0.2≤X≤0.33,0.1≤m≤0.8, Wherein, subscript X refers to the changes of contents of metallic element, and m represents the quantity of the crystallization water.

5. ageing-resistant asphalt modifier according to claim 1, which is characterized in that the salicylate intercalated houghite Preparation method includes the following steps:

Weigh the second hydrotalcite and salicylic acid that molar ratio is 1:4, the ingredient of second hydrotalcite and first hydrotalcite, Molecular formula is all the same；

The salicylic acid is heated to be dissolved in ethylene glycol after 40~80 DEG C and is configured to solution A；

Second hydrotalcite is added in the solution A and is uniformly dispersed, slurries B is made；

The pH value for adjusting the slurries B with alkaline solution is stirred to react 1~2h at a temperature of 140~160 DEG C, filters to 3~4 Obtain solid matter；

By solid matter washing, dry, grinding, salicylate intercalated houghite is made.

6. ageing-resistant asphalt modifier according to claim 5, which is characterized in that the dispersing agent is ethylene glycol, the third two One or more of alcohol, normal propyl alcohol, n-butanol, isobutanol, isoamyl alcohol.

7. ageing-resistant asphalt modifier according to claim 5, which is characterized in that the fineness of first hydrotalcite is 200~600 mesh, the fineness of the salicylate intercalated houghite are 200~600 mesh.

8. ageing-resistant asphalt modifier according to claim 5, which is characterized in that the alkaline solution is that NaOH is molten Liquid.

9. a kind of preparation method of ageing-resistant asphalt modifier, which comprises the steps of:

S1: salicylate intercalated houghite is prepared.

S2: the salicylate intercalated houghite mass percent for being 70%~100% by the mass percent being prepared in S1 It is uniformly mixed for 0%~30% the first hydrotalcite.

10. a kind of ageing-resistant pitch, which is characterized in that the ageing-resistant pitch is described in any item resistance to old by claim 1 to 8 Change asphalt modifier to mix with pitch, wherein the mass ratio of the ageing-resistant asphalt modifier and the pitch for 0.04~ 0.1:1.

Technical field

The present invention relates to field of bitumen technology, and in particular to a kind of ageing-resistant asphalt modifier and preparation method thereof and resistance to old Change pitch.

Background technique

In recent years, Xinjiang expressway construction was developed rapidly, to the end of the year 2015, the built high speed in Xinjiang Total mileage of highway is up to 4316 kilometers.According to planning, the year two thousand twenty is arrived, Xinjiang will strive completing Transportation Infrastructure Construction investment 10,000 Hundred million yuan, about 15.2 ten thousand kilometers of total kilometrage are built, wherein about 8500 kilometers of highway, at that time, Xinjiang will build up ten thousand kilometers of high speeds Highway main framing.However Xinjiang their location solar energy is abundant, ultraviolet irradiation intensity is big, bituminous pavement easily aging, and then produces Raw to destroy, not only Xinjiang is in this way, China is entire western most of regional all in ultraviolet strong irradiated site, as west area is handed over The flat further rapid development of water flowing and its complicated special climatic environment requirement, these areas will certainly be to asphalt roads Durability put forward higher requirements.Therefore, high performance ageing-resistant asphalt modifier is prepared for the pitch in west area The anti-aging of road has very important significance.

Having always both at home and abroad can be carried out research to the resistance to ag(e)ing of pitch, to increase pitch ageing-resistant performance, commonly Method is to asphalt modification.Currently used asphalt modifier is SBR modifying agent and SBS modifier.

Such as Chinese patent 200810204209.4 uses SBR modifier modification pitch, and proposes in SBR modified pitch Middle addition can absorb the CeO of ultraviolet light₂Nanoparticle or ultraviolet absorber UV531, can significantly improve SBR modified pavement asphalt Resistance to UV aging.But CeO₂Nanoparticle forms the dispersion of nanoscale in pitch, it is necessary first to using coprecipitated Shallow lake method is subject to Mr.'s high-temperature calcination powdering modifying agent, it is also necessary to be prepared as slurries dress using ultrasonic wave dispersion in dispersing agent and change Property agent, be used further to asphalt modification, prepare in the industrial production more difficult.

Therefore, how preparation process is simple, the significantly ageing-resistant modifying agent of effect becomes the ageing-resistant project of current pitch Hot spot.

Summary of the invention

The shortcomings that for the above-mentioned prior art or deficiency, the application technical problems to be solved are to develop a kind of preparation process Simple and effective asphalt modifier increases pitch ageing-resistant performance.

In order to solve the above technical problems, the ageing-resistant pitch changes this application provides a kind of ageing-resistant asphalt modifier Property agent is by the first hydrotalcite that mass percent is 0%~30% and the salicylic acid root cutting that mass percent is 70%~100% Layer hydrotalcite composition.

Preferably, the first hydrotalcite and 75% that the ageing-resistant asphalt modifier is 5%~25% by mass percent ~95% salicylate intercalated houghite composition.

Preferably, the first hydrotalcite and 80% that the ageing-resistant asphalt modifier is 10%~20% by mass percent ~90% salicylate intercalated houghite composition.

Preferably, first hydrotalcite is magnalium carbonate hydrotalcite, and specific molecular formula is

[Mg_1-X Al_X(OH)₂]^X+[(CO₃)_X/2]^X-·mH₂O, 0.2≤X≤0.33,0.1≤m≤0.8, wherein subscript X refers to The changes of contents of metallic element, m represent the quantity of the crystallization water.First hydrotalcite can be the naturally occurring magnalium of nature Carbonate hydrotalcite, or the magnalium carbonate hydrotalcite of coprecipitation preparation.

Preferably, the preparation preparation method of the salicylate intercalated houghite includes the following steps:

Weigh the second hydrotalcite and salicylic acid that molar ratio is 1:4, second hydrotalcite and first hydrotalcite Ingredient, molecular formula are all the same；

The salicylic acid is heated to be dissolved in ethylene glycol after 40~80 DEG C and is configured to solution A；

Second hydrotalcite is added in the solution A and is uniformly dispersed, slurries B is made；

The pH value of the slurries B is adjusted to 3~4 with alkaline solution, is stirred to react 1~2h at a temperature of 140~160 DEG C, Solid matter is obtained by filtration；

By solid matter washing, dry, grinding, salicylate intercalated houghite is made.

Preferably, the dispersing agent is ethylene glycol, propylene glycol, normal propyl alcohol, n-butanol, isobutanol, one in isoamyl alcohol Kind is several, wherein is arbitrary proportion when several dispersants.

Preferably, the fineness of first hydrotalcite is 200~600 mesh, the fineness of the salicylate intercalated houghite For 200~600 mesh.

Preferably, the alkaline solution is NaOH.

Present invention also provides a kind of preparation methods of ageing-resistant asphalt modifier, include the following steps:

S1: salicylate intercalated houghite is prepared.

S2: the salicylate intercalated houghite quality hundred for being 70%~100% by the mass percent being prepared in S1 Divide than being uniformly mixed for 0%~30% the first hydrotalcite.

A kind of ageing-resistant pitch, the ageing-resistant pitch are mixed by ageing-resistant asphalt modifier with pitch, wherein institute The mass ratio for stating ageing-resistant asphalt modifier and the pitch is 0.04~0.1:1.

The present invention prepares more complicated defect for asphalt modifier in the prior art, provides a kind of ageing-resistant pitch Modifying agent and preparation method thereof, and ageing-resistant asphalt modifier is used for modified pitch.Use hydrotalcite and salicylic acid as original Material prepares salicylate intercalated houghite, and will make salicylate intercalated houghite and hydrotalcite than mixing according to certain mass Carry out modified pitch for asphalt modifier, obtains ageing-resistant pitch.

It is a kind of ultraviolet-resistant haveing excellent performance since hydrotalcite is a kind of aluminium magensium silicate mineral with layer structure Material, multistage laminate can multiple reflections and refraction ultraviolet light, play the role of physical shielding to ultraviolet light, the metal on laminate Element and interlayer anion can play chemisorption to ultraviolet light, and therefore, hydrotalcite can be effective as asphalt modifier Using hydrotalcite on the physical shielding and laminate of ultraviolet light metallic element and interlayer anion to the double of ultraviolet radiation absorption Recast is used, and hydrotalcite does not need nanoscale dispersion as asphalt modifier, and preparation process is relatively simple, and hydrotalcite is as drip Green modifying agent can significantly improve the anti-ultraviolet ageing performance of pitch, extend the service life of pitch.

In addition, salicylic acid has uv absorption property because of the feature in chemical structure, by salicylic acid in the technical program Root introduces hydrotalcite layers as object, so that salicylate is replaced carbonate, calcining or ultrasonic wave are not needed in preparation process The processes such as dispersion, prepare relatively simple, acquired salicylate intercalated houghite material, have biggish interlamellar spacing, good Thermal stability and shielding absorb action of ultraviolet radiation, therefore, can be effectively sharp using salicylate intercalated houghite as asphalt modifier The characteristic that ultraviolet light is shielded and absorbed with salicylate intercalated houghite, significantly improves the anti-ultraviolet ageing performance of pitch, extends The service life of pitch.

Therefore, compared with prior art, a kind of ageing-resistant asphalt modifier preparation process provided in the present invention is simple, is easy to It realizes, can significantly improve the ageing-resistant performance of pitch.

Detailed description of the invention

By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is other Feature, objects and advantages will become more apparent upon:

Fig. 1: the XRD spectra of hydrotalcite and salicylate intercalated houghite in the application；

Specific embodiment

The present invention is further illustrated below by embodiment.It is base that 70# bi tumenf orr oad is chosen in following embodiment Matter is mixed to prepare asphalt modifier with hydrotalcite and salicylate intercalated houghite with different quality percentage, due to the first water The ingredient and molecular formula of talcum and the second hydrotalcite are all the same, refer to the first hydrotalcite or the in embodiment with hydrotalcite Two hydrotalcites.

Carry out modified pitch using asphalt modifier made from different embodiments, obtains the different modified pitch of each group. Bitumen ductility refers to the extensibility of pitch, and ductility is bigger, shows that the plasticity of pitch is better.Colloid is reduced in pitch after aging, Asphalitine increases, and softening point increases, ductility decline.The low-temperature ductility of pitch can react plasticity of the pitch under low-temperature condition, That is the quality of its non-deformability.The present embodiment is using 5 DEG C of ductility retention rates as the Ageing Index of pitch.

According to " highway engineering pitch and Asphalt Mixture Experiment regulation ", following embodiment record passes through various combination ingredient Asphalt modifier before modified after 5 DEG C of ductility data being measured in ultraviolet light (UV) degradation of pitch, come with this specific Illustrate the effect of asphalt modifier.Wherein,

Using SYD-4508C type numerical control soft pitch ductility machine, bitumen ductility is tested, tensile speed 5cm/ Min, unit are indicated with cm.

Ultraviolet light (UV) degradation uses LHX-205 type intelligent numerical control light-heat aging case, uses wavelength for 365nm's GHF125W-03 type mercury lamp, ultraviolet light irradiation degree are 2000 μ W/m2, and temperature is controlled in (50 ± 0.5) DEG C, ageing time 14d.