CN109735123B - Rubber asphalt and preparation method thereof - Google Patents

Abstract

The invention discloses rubber asphalt and a preparation method thereof. The rubber asphalt comprises the following components: 30-70 parts of high-grade straight-run asphalt, 3-15 parts of rubber modifier, 0.02-0.5 part of stabilizer, 1-8 parts of lubricant, 0.02-0.5 part of solubilizer and 0-20 parts of filler; the penetration degree of the high-grade straight-run asphalt at 0 ℃ is 200-3000.1 mm, and the softening point is 20-70 ℃. Compared with the prior rubber asphalt, the rubber asphalt of the invention has the following advantages: (1) the storage stability is high and the segregation is not easy to occur; (2) high extensibility; (3) low viscosity; (4) low density; (5) high sustained viscosity and high adhesion; (6) no petroleum softener and organic solvent addition, and low VOC.

Description

Rubber asphalt and preparation method thereof

Technical Field

The invention belongs to the technical field of waterproof materials for constructional engineering, and particularly relates to rubber asphalt and a preparation method thereof.

Background

At present, the leakage rate of domestic buildings is high, waterproof materials are used as functional materials of buildings, and the quality and the waterproof effect of the waterproof materials directly determine the service life of the buildings. The rubber modified asphalt product still plays a leading role in the current building waterproof field, mainly comprises three types of rubber asphalt waterproof coiled materials, rubber asphalt waterproof coatings and matching materials, and the core technical performance of the product depends on rubber asphalt, so the rubber asphalt modified asphalt product is particularly key to the physical performance and application research of the rubber asphalt.

In the aspect of products, the existing rubber asphalt mainly comprises asphalt, petroleum softening agents (waste engine oil, minus line oil, rubber oil, aromatic oil and the like), SBS modifiers, fillers and the like, and the problems of segregation, layering and the like of the rubber asphalt are easily caused due to the formulation design, the external seepage of the softening agents and the like, so that the physical properties and the storage stability of rubber asphalt products are influenced. Therefore, it is necessary to invent a high-stability and non-segregation rubber asphalt and a preparation method thereof.

In the application aspect, the SBS modifier is usually added into the existing rubber asphalt product to improve the material strength, the high-modulus, high-strength and high-viscosity modified asphalt is generally taken as a main material, the extensibility of the material is reduced when the material strength is too high, the capability of the material for being suitable for deformation of a base layer is reduced, the interface stripping is easy to occur, and a water channeling channel is formed. Secondly, the high-viscosity rubber asphalt has high construction temperature which can reach 180-200 ℃ generally, and a large amount of smoke is easy to generate in the construction process, thus being harmful to the environment. Thirdly, the low viscosity rubber asphalt generally contains organic solvent, has high VOC content (more than or equal to 10g/L) and is harmful to the environment and human body. Therefore, it is required to invent a rubber asphalt with high elongation, high adhesion, low viscosity and low VOC and a preparation method thereof.

Disclosure of Invention

The invention aims to solve the problems and provides rubber asphalt with high elongation, high adhesion, high stability, low VOC, low viscosity and low density and a preparation method thereof.

In order to achieve the above object, a first aspect of the present invention provides a rubberized asphalt comprising the following components:

30-70 parts of high-grade straight-run asphalt, 3-15 parts of rubber modifier, 0.02-0.5 part of stabilizer, 1-8 parts of lubricant, 0.02-0.5 part of solubilizer and 0-20 parts of filler.

As a preferred embodiment of the present invention, the rubber asphalt comprises the following components:

45-55 parts of high-grade straight-run asphalt, 8-10 parts of rubber modifier, 0.1-0.25 part of stabilizer, 3-6 parts of lubricant, 0.1-0.25 part of solubilizer and 0-20 parts of filler.

In a preferred embodiment of the present invention, the penetration of the high-grade straight asphalt at 0 ℃ is 200 to 3000.1 mm, and the softening point is 20 to 70 ℃.

As a preferred embodiment of the present invention, the high-grade straight asphalt is 200# straight asphalt and/or 250# straight asphalt.

As a preferred embodiment of the present invention, the rubber modifier is at least one selected from the group consisting of EPDM, cement rubber powder and tire rubber powder.

As a preferred embodiment of the present invention, the stabilizer is at least one selected from the group consisting of maleic anhydride, sulfur, sulfate, and chromium-based complex.

As a preferred embodiment of the present invention, the lubricant is selected from at least one of fischer-tropsch wax, polyethylene wax, oxidized polyethylene wax, polypropylene wax, and EVA wax.

As a preferred embodiment of the present invention, the solubilizer is an alkylphenol type compound. In the invention, the solubilizer is used for improving the solubility of the rubber modified powder in the asphalt under the condition of low-temperature modification temperature (140-160 ℃), and has the function of improving the dissolution effect.

As a preferred embodiment of the present invention, the filler is at least one selected from the group consisting of glass beads, stone powder, bentonite, calcium carbonate, fly ash and carbon black.

The second aspect of the present invention provides the above-mentioned process for producing a rubberized asphalt, which comprises:

mixing high-grade straight-run asphalt with a rubber modifier, adding a solubilizer into the obtained mixture, shearing, adding a lubricant and a stabilizer, optionally adding a filler, and stirring to obtain the rubber asphalt.

In a preferred embodiment of the present invention, the temperature of the shearing is 140 to 160 ℃.

Compared with the prior rubber asphalt, the rubber asphalt of the invention has the following advantages:

(1) high storage stability and difficult segregation: the storage stability test result of the invention is less than or equal to 10 ℃, the difference of the softening points of the upper layer and the lower layer is very small, the added solubilizer is matched with the preparation method to realize the chemical bond fracture of the crosslinked rubber modifier, so that the rubber modifier is completely dissolved in the asphalt, and then the stabilizer is added to realize the chemical crosslinking between the asphalt and the rubber, and between the rubber and the rubber, so as to form asphalt-rubber gel, and the spatial network structure is stable and is not easy to separate. Thus, the technical process of first decrosslinking and then crosslinking is completed.

(2) High extensibility: the extensibility of the product can reach more than 80mm, the product can adapt to the concrete structure crack of 80mm, the integrity and the continuity of a waterproof system are ensured, and the conversion of rubber is fully realized.

(3) Low viscosity: the invention has lower viscosity and more excellent construction performance, which cannot be realized by asphalt, rubber modifier and lubricant alone, and must adopt a form of compounding high-grade asphalt (such as 200# and/or 250# asphalt), lubricant and solubilizer. The high-grade liquid asphalt is taken as a base material, a lubricant and a solubilizer are used for optimizing the performance, the high-temperature and low-temperature lubricating effect of the lubricant is exerted on the basis of realizing the dissolution of the rubber modified powder, the viscosity of the lubricant is 500mPa & s at 110 ℃, and the spraying construction can be carried out at 110 ℃.

(4) Low density: the rubber asphalt composition of the invention contains low-density light raw materials such as glass beads and the like, and the density and the dosage of the materials are reduced, so that the rubber asphalt has the effect of saving the materials in the using process.

(5) High permanent viscosity and high adhesion: the tackiness refers to the ability of the rubberized asphalt to resist displacement when a weight of a prescribed weight is hung vertically in the direction of the pressure-sensitive adhesive tape stuck on the adherend. In general, tack can be divided into shear tack and peel tack. The rubber asphalt provided by the invention adopts the shear-holding viscosity to reflect the anti-sagging performance of the rubber asphalt, and can accurately reflect the viscosity states of products and base layers, products and coiled materials and the interior of the products. By adopting the mode, the composite anti-sliding performance of the product and the coiled material can be judged quickly, so that the construction feasibility and the applicability of the product in the vertical surface range are judged.

The test method is carried out according to the method of 7.16.1.1 sample preparation and maintenance in JC/T2428-2017. Vertically hanging, hanging 500g of heavy objects (including the mass of the lower plate) at the lower end of the test piece, starting to record time, recording the time required for the test piece to completely fall off from the upper plate, counting five test pieces, and taking the average value of the test results of the five test pieces. If the individual test piece does not fall off after more than 60min, recording the test piece in 60 min; if all test pieces are not dropped for more than 60min, the test result is reported to be more than 60 min.

(6) No petroleum softener and organic solvent addition, low VOC: different from the existing rubber asphalt in the market, the rubber asphalt of the invention has the solid content of more than 99 percent, does not add petroleum softening agents such as minus line oil, rubber oil, aromatic oil and the like and organic solvents, has the VOC content of less than or equal to 10g/L, has stable structure, does not segregate, is a non-hazardous article, and is environment-friendly and nontoxic. Petroleum series softening agents or organic solvents are added to similar products in the market, the softening agents are easy to migrate out of the structure to influence the aging performance of the materials, and the organic solvents are harmful to the environment and human health.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Detailed Description

Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Typical properties of the rubber asphalt of the present invention are shown in Table 1, and the added parts by weight of each component in the examples of the present invention are shown in Table 2.

TABLE 1 physical mechanical Property requirements

TABLE 2 Components and component contents in the examples

Examples 1 to 3:

sequentially adding high-grade asphalt, a rubber modifier and a solubilizer, shearing at 150 ℃ for 1.5h at a high speed, shearing at a rotating speed of 4500rpm for 10min, then rotating at 3000rpm for shearing, sequentially adding a stabilizer, a lubricant and a filler, and stirring at a rotating speed of 1200rpm for 15min by a variable frequency stirrer to obtain the asphalt.

Example 4:

sequentially adding high-grade asphalt, a rubber modifier and a solubilizer, shearing at a high speed of 150 ℃ for 1.5h, shearing at a rotating speed of 5000rpm for 10min, then shearing at a rotating speed of 4000rpm, sequentially adding a lubricant, a stabilizer and a filler, and stirring at a rotating speed of 1200rpm for 10min by a variable frequency stirrer to obtain the asphalt.

Example 5:

sequentially adding high-grade asphalt, a rubber modifier and a solubilizer, shearing at a high speed of 5500rpm for 10min at 140 ℃ for 2h, then shearing at 3000rpm, sequentially adding a lubricant, a stabilizer and a filler, and stirring at 1000rpm for 15min under a variable frequency stirrer to obtain the asphalt.

Example 6:

sequentially adding high-grade asphalt, a rubber modifier and a solubilizer, shearing at a high speed of 160 ℃ for 1.2h, shearing at a rotating speed of 6000rpm for 10min, then shearing at a rotating speed of 5000rpm, sequentially adding a lubricant, a stabilizer and a filler, and stirring at a rotating speed of 1000rpm for 20min by a variable frequency stirrer to obtain the asphalt.

TABLE 3 test results of properties of rubber asphalt prepared in each example

Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims (9)

1. The rubber asphalt is characterized by comprising the following components:

45-55 parts of high-grade straight-run asphalt, 3-15 parts of rubber modifier, 0.02-0.5 part of stabilizer, 3-6 parts of lubricant, 0.1-0.25 part of solubilizer and 0-20 parts of filler;

the solubilizer is an alkylphenol compound;

the lubricant is selected from at least one of Fischer-Tropsch wax, polyethylene wax, oxidized polyethylene wax, polypropylene wax, and EVA wax.

2. The rubberized asphalt of claim 1 wherein the rubberized asphalt comprises the following components:

45-55 parts of high-grade straight-run asphalt, 8-10 parts of rubber modifier, 0.1-0.25 part of stabilizer, 3-6 parts of lubricant, 0.1-0.25 part of solubilizer and 0-20 parts of filler.

3. The rubberized asphalt according to claim 1 or 2, wherein the high-grade straight asphalt has a penetration at 0 ℃ of 200 to 3000.1 mm and a softening point of 20 to 70 ℃.

4. The rubberized asphalt of claim 3, wherein the high-grade straight-run asphalt is 200# straight-run asphalt and/or 250# straight-run asphalt.

5. The rubber asphalt of claim 1 or 2, wherein the rubber modifier is selected from at least one of EPDM, cement rubber crumb and tire rubber crumb.

6. The rubberized asphalt of claim 1 or 2,

the stabilizer is at least one selected from maleic anhydride, sulfur, sulfate and chromium-based complex.

7. The rubberized asphalt of claim 1 or 2, wherein the filler is selected from at least one of glass micro beads, stone powder, bentonite, calcium carbonate, fly ash, and carbon black.

8. The process for producing a rubber asphalt as described in any one of claims 1 to 7, characterized by comprising:

mixing high-grade straight-run asphalt with a rubber modifier, adding a solubilizer into the obtained mixture, shearing, adding a lubricant and a stabilizer, optionally adding a filler, and stirring to obtain the rubber asphalt.

9. The method according to claim 8, wherein the shearing temperature is 140 to 160 ℃.