阅读说明：本技术 一种温拌改性剂及其制备方法 (Warm-mixing modifier and preparation method thereof ) 是由 戴锋 于 2019-11-07 设计创作，主要内容包括：本发明公开了一种温拌改性剂及其制备方法,其技术要点为：原料按重量份包括以下组分：N,N,_亚乙基双硬脂酰胺25-56份,硬脂酸正丁酯18-35份,乙基纤维素16-36份,芳烃油相容剂15-35份,增韧剂12-30份；制备过程为：将N,N,_亚乙基双硬脂酰胺液体、硬脂酸正丁酯液体和乙基纤维素液体以及芳烃油相容剂以及增韧剂,混合得到液态混合物；再将液态混合物冷却至粘稠状后造粒,在常温下晾干,然后进行粉碎,过15-20目筛,取筛下物,得到温拌改性剂。本发明的温拌改性剂可以有效降低沥青混合料拌和温度,从而改善生产沥青混合料时的能源消耗和烟尘等废弃物排放的增多的问题,而且在环境温度较低的冬季施工可以顺利施工,不会过多影响沥青混合料本身的韧性和和粘结性等。(The invention discloses a warm mixing modifier and a preparation method thereof, and the technical key points are as follows: the raw materials comprise the following components in parts by weight: 25-56 parts of N, N, ethylene bis stearamide, 18-35 parts of N-butyl stearate, 16-36 parts of ethyl cellulose, 15-35 parts of aromatic oil compatilizer and 12-30 parts of toughening agent; the preparation process comprises the following steps: mixing N, N, ethylene bis stearamide liquid, N-butyl stearate liquid, ethyl cellulose liquid, an aromatic oil compatilizer and a flexibilizer to obtain a liquid mixture; and cooling the liquid mixture to be viscous, granulating, drying at normal temperature, crushing, sieving by a 15-20-mesh sieve, and taking undersize products to obtain the warm-mix modifier. The warm mixing modifier can effectively reduce the mixing temperature of the asphalt mixture, thereby improving the problems of energy consumption, smoke dust and other waste emission increase during the production of the asphalt mixture, and can be smoothly constructed in winter with lower environmental temperature without excessively influencing the toughness, caking property and the like of the asphalt mixture.)

1. The warm mixing modifier is characterized by comprising the following raw materials in parts by weight: 25-56 parts of N, N, ethylene bis stearamide, 18-35 parts of N-butyl stearate, 16-36 parts of ethyl cellulose, 15-35 parts of aromatic oil compatilizer and 12-30 parts of toughening agent.

2. The warm-mix modifier according to claim 1, wherein: the raw materials of the toughening agent comprise the following components: 20-35 parts of epoxy resin, 5-12 parts of liquid polysulfide rubber and 18-30 parts of nano calcium carbonate.

3. The warm-mix modifier according to claim 1, wherein: the ethyoxyl of the ethyl cellulose accounts for 46-48% by weight.

4. The warm-mix modifier according to claim 1, wherein: the epoxy resin is one or two of phenolic epoxy resin and alicyclic epoxy resin.

5. The warm-mix modifier according to claim 1, wherein: the aromatic oil compatilizer comprises the following raw materials in parts by weight: 10-25 parts of one or more of benzene, toluene and xylene, and 12-35 parts of maleic anhydride grafted polyethylene.

6. The warm-mix modifier of claim 1, which is characterized by comprising the following raw materials in parts by weight: 42 parts of N, N, ethylene bis stearamide, 25 parts of N-butyl stearate, 28 parts of ethyl cellulose, 30 parts of aromatic oil compatilizer and 23 parts of toughening agent.

7. The method for preparing the warm-mix modifier according to any one of claims 1 to 6, characterized by comprising the steps of:

s1, heating the N, N and ethylene bis-stearamide at the temperature of 145 +/-5 ℃ for 10min to obtain N, N and ethylene bis-stearamide liquid;

s2, heating n-butyl stearate at the temperature of 155 +/-5 ℃ for 10min to obtain n-butyl stearate liquid;

s3, heating the ethyl cellulose at the temperature of 165 +/-5 ℃ for 10min to obtain ethyl cellulose liquid;

s4, mixing the N, N, ethylene bis stearamide liquid, the N-butyl stearate liquid, the ethyl cellulose liquid and the aromatic oil compatilizer at the temperature of 160 +/-5 ℃ for 15min, adding the flexibilizer, and continuously stirring for 10min to obtain a liquid mixture;

s5, cooling the liquid mixture to be viscous, granulating, airing at normal temperature, then crushing, sieving by a 15-20-mesh sieve, and taking undersize to obtain the warm-mix modifier.

8. The method for preparing a warm-mix modifier according to claim 7, wherein: the step S1 is gradually warmed up to 145 +/-5 ℃ in 10min, the step S2 is gradually warmed up to 155 +/-5 ℃ in 10min, and the step S3 is gradually warmed up to 165 +/-5 ℃ in 10 min.

Technical Field

The invention relates to the field of road maintenance, in particular to a warm mixing modifier and a preparation method thereof.

Background

In the process of using the road, the road is inevitably damaged due to external factors and road materials, and the damaged part of the road needs to be maintained in time for the use safety of the road. At present, roads are often rearranged by asphalt mixtures, but the mixing and compacting temperatures of the asphalt mixtures are high, so that the energy consumption and the emission of wastes such as smoke dust are increased when the asphalt mixtures are produced, and the construction is hindered in winter when the environmental temperature is low.

In order to solve the problems, a warm-mixed asphalt modification technology is developed, a specific technical scheme or an additive is used, the mixing and construction temperature (110-130 ℃) is between that of a hot-mixed asphalt mixture (150-180 ℃) and that of a cold-mixed asphalt mixture (normal temperature), the performance of the warm-mixed asphalt is up to or close to that of the hot-mixed asphalt, and the warm-mixed asphalt modification technology is environment-friendly and saves resources.

The existing warm mixing technical approaches achieve the warm mixing effect by reducing the high-temperature viscosity of the asphalt, wherein an organic viscosity reducer method is the most common method, has the characteristics of reliable warm mixing and cooling effect, proper cost performance and the like, and can greatly reduce the high-temperature viscosity of the asphalt by adding the organic viscosity reducer. On the other hand, however, the addition of such organic additives also has some technical negative effects: 1. most of the organic viscosity reducers reduce the low-temperature ductility of the asphalt, so that the asphalt becomes brittle and the low-temperature performance of the asphalt mixture is damaged; 2. the interface lubricating effect brought by wax components and lubricating groups (such as amide substances) in most of simple organic viscosity reducers reduces the interface cohesive force of asphalt and stone, weakens the adhesion, and brings adverse effects of reducing the water damage resistance of pavements, falling off stone and the like.

The prior application publication No. CN102061098A discloses a warm-mix modifier for asphalt mixture and a preparation method thereof, wherein the warm-mix modifier contains a certain proportion of Fischer-Tropsch paraffin (FT wax), an organic compound for improving low-temperature flexibility and synthetic resin thereof; the asphalt mixture is compounded with other special organic compounds and synthetic resin to modify asphalt and raise the softening point, low temperature toughness and strength of asphalt material.

Therefore, the invention also aims to provide a warm modifier for asphalt, which improves the current problems of the existing warm mixing modification technology of an organic viscosity reducer method, reduces the mixing temperature of the asphalt mixture, and simultaneously does not influence the toughness, the caking property and the like of the asphalt mixture too much.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a warm mixing modifier and a preparation method thereof, which can effectively reduce the mixing temperature of an asphalt mixture, do not influence the toughness, the caking property and the like of the asphalt mixture too much, and are simple and convenient.

In order to achieve the purpose, the invention provides the following technical scheme:

the warm mixing modifier comprises the following raw materials in parts by weight: 25-56 parts of N, N, ethylene bis stearamide, 18-35 parts of N-butyl stearate, 16-36 parts of ethyl cellulose, 15-35 parts of aromatic oil compatilizer and 12-30 parts of toughening agent.

By adopting the technical scheme, the N, N and ethylene bis stearamide is white or milk white powder or granular substance, has excellent lubricating effect, can be used as an excellent anti-adhesion machine and a lubricant in the asphalt mixture, so that the mixing temperature of the asphalt mixture is effectively reduced, and in addition, the N, N and ethylene bis stearamide also has a certain antistatic effect and reduces the electrostatic hazard of the asphalt mixture; n-butyl stearate also acts as a lubricant, which has good internal lubrication and thermal stability, and together with N, ethylene bis stearamide, accomplishes the mixing temperature lowering task for asphalt mixtures, while N-butyl stearate also increases the water resistance of asphalt mixtures by virtue of its own water resistance.

In addition, in order to avoid excessive reduction of the bonding capacity of the asphalt mixture caused by the addition of N, N, ethylene bis stearamide and N-butyl stearate, the ethyl cellulose is added in the invention, so that the ethyl cellulose has good fluidity at high temperature without influencing the stirring of the asphalt mixture, and is gradually solidified when the temperature is reduced, the viscosity is increased, the bonding strength of the asphalt mixture can be effectively maintained, meanwhile, the N-butyl stearate can play a plasticizing role on the ethyl cellulose, so that the N-butyl stearate and the ethyl cellulose can be compounded besides playing a basic role, and the plastic processing performance and the flexibility of the asphalt mixture are improved.

The aromatic oil compatilizer is used as a main solvent, so that N-butyl stearate, ethyl cellulose and N, N and ethylene bis stearamide can be fully fused together to assist in mixing and dispersing the N-butyl stearate, the ethyl cellulose and the N, N and ethylene bis stearamide in the asphalt mixture, and meanwhile, the aromatic oil in the aromatic oil compatilizer not only has certain compatibility, but also can enhance the anti-weathering, oxidation, friction and aging degrees of the asphalt mixture.

Meanwhile, the toughening agent is added in the invention, so that the brittleness of the asphalt mixture can be effectively reduced, the impact resistance of the asphalt mixture can be improved, the mixing temperature of the asphalt mixture can be effectively reduced, the toughness, the caking property and the like of the asphalt mixture cannot be influenced too much,

The invention is further configured that the raw materials of the toughening agent comprise the following components: 20-35 parts of epoxy resin, 5-12 parts of liquid polysulfide rubber and 18-30 parts of nano calcium carbonate.

By adopting the technical scheme, the epoxy resin is used as an organic polymer compound containing two or more than two epoxy groups in the molecule, so that the epoxy resin has high hardness and good flexibility, has certain bonding strength, and improves the bonding strength of the asphalt mixture while improving the toughness of the asphalt mixture; the liquid polysulfide rubber further toughens the epoxy resin to prevent the epoxy resin from becoming brittle so as to further improve the shock resistance of the epoxy resin, thereby further improving the shock resistance of the asphalt mixture. The nano calcium carbonate is used as a filler, and can be used for toughening and reinforcing the asphalt mixture and improving the bending strength and the bending elastic modulus of the asphalt mixture.

The invention is further provided that the ethyl cellulose contains 46-48% of ethoxy groups by weight.

By adopting the technical scheme, the property of the ethyl cellulose is changed along with the content of the ethoxy group, and when the content of the ethoxy group of the ethyl cellulose is 46-48%, the ethyl cellulose has good flexibility and flexibility, and the toughness of the asphalt mixture can be further improved while the bonding strength of the asphalt mixture is improved.

The invention is further provided that the epoxy resin is one or two of novolac epoxy resin and alicyclic epoxy resin.

By adopting the technical scheme, the novolac epoxy resin has high epoxy group content, so that the cured product has high crosslinking density and good physical and mechanical properties, the mechanical property of the asphalt mixture can be effectively improved, the novolac epoxy resin has high viscosity, and the bonding strength of the asphalt mixture can be further improved; the aliphatic epoxy resin is characterized in that the epoxy group of the alicyclic epoxy resin is directly connected to the alicyclic ring, so that a compact rigid molecular structure can be formed, the cross-linking density is also high after curing, and the alicyclic epoxy resin also has good weather resistance, so that the service life of the asphalt mixture can be further prolonged.

The invention is further set up in that the aromatic oil compatilizer comprises the following raw materials in parts by weight: 10-25 parts of one or more of benzene, toluene and xylene, and 12-35 parts of maleic anhydride grafted polyethylene.

By adopting the technical scheme, benzene, toluene and xylene are aromatic oil, and have good compatibility with N-butyl stearate, ethyl cellulose and N, N, ethylene bis stearamide; the maleic anhydride grafted polyethylene can effectively improve the compatibility of each component by introducing polar molecule maleic anhydride, and polyethylene molecules are introduced by adding the maleic anhydride grafted polyethylene, so that the polyethylene has good low-temperature toughness and impact resistance, and the road performance of the asphalt mixture can be further improved.

The invention is further provided that a warm-mix modifier comprises the following raw materials in parts by weight: 42 parts of N, N, ethylene bis stearamide, 25 parts of N-butyl stearate, 28 parts of ethyl cellulose, 30 parts of aromatic oil compatilizer and 23 parts of toughening agent.

By adopting the technical scheme, the content ratio of the N, N, ethylene bis stearamide, the N-butyl stearate, the ethyl cellulose, the aromatic oil compatilizer and the toughening agent is optimized, so that the warm-mixing modifier can more effectively modify the performance of the asphalt mixture.

The invention also aims to provide a preparation method of the warm-mixing modifier, which is characterized by comprising the following steps:

s1, heating the N, N and ethylene bis-stearamide at the temperature of 145 +/-5 ℃ for 10min to obtain N, N and ethylene bis-stearamide liquid;

s2, heating n-butyl stearate at the temperature of 155 +/-5 ℃ for 10min to obtain n-butyl stearate liquid;

s3, heating the ethyl cellulose at the temperature of 165 +/-5 ℃ for 10min to obtain ethyl cellulose liquid;

s4, mixing the N, N, ethylene bis stearamide liquid, the N-butyl stearate liquid, the ethyl cellulose liquid and the aromatic oil compatilizer at the temperature of 160 +/-5 ℃ for 15min, adding the flexibilizer, and continuously stirring for 10min to obtain a liquid mixture;

s5, cooling the liquid mixture to be viscous, granulating, airing at normal temperature, then crushing, sieving by a 15-20-mesh sieve, and taking undersize to obtain the warm-mix modifier.

By adopting the technical scheme, the N, N, ethylene bis stearamide, the N-butyl stearate and the ethyl cellulose are pre-melted, so that the N, N, ethylene bis stearamide liquid, the N-butyl stearate liquid and the ethyl cellulose liquid are fused with the aromatic hydrocarbon compatilizer, and the toughening agent is added, so that the components of the warm mixing modifier can be mixed more uniformly and have uniform properties, and the asphalt mixture can be better modified.

The invention is further provided that the step S1 is gradually warmed to 145 +/-5 ℃ in 10min, the step S2 is gradually warmed to 155 +/-5 ℃ in 10min, and the step S3 is gradually warmed to 165 +/-5 ℃ in 10 min.

By adopting the technical scheme, the N, N, ethylene bis stearamide liquid, the N-butyl stearate liquid and the ethyl cellulose liquid are gradually melted by gradually heating, so that the problem of local agglomeration is avoided.

In conclusion, the invention has the following beneficial effects:

1. the invention utilizes N-butyl stearate and N, N, ethylene bis stearamide to reduce the mixing temperature of the asphalt mixture, utilizes ethyl cellulose to maintain the bonding strength of the asphalt mixture, and utilizes the compounding action between the N-butyl stearate and the ethyl cellulose and the toughening action of the toughening agent to improve the impact strength of the asphalt mixture, so that the warm mixing modifier can effectively reduce the mixing temperature of the asphalt mixture, does not influence the toughness, the caking property and the like of the asphalt mixture too much, and has simple and convenient preparation method;

2. in the preparation process of the warm-mix modifier, the related components are gradually heated and melted, so that the problem of local agglomeration of the related components is avoided, the components of the warm-mix modifier are mixed more uniformly and have uniform properties, and the warm-mix modifier has a better modification effect on an asphalt mixture.

Detailed Description

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

The raw materials used in the invention are: