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KR-20260065840-A - Bitumen composition containing lignin and method for preparing the same

KR20260065840AKR 20260065840 AKR20260065840 AKR 20260065840AKR-20260065840-A

Abstract

As a bitumen composition, the bitumen composition is: (a) at least one bitumen modified with an elastomeric copolymer; and (b) at least one mixture comprising lignin and a mixture of saturated and/or unsaturated vegetable fatty acids having 6 to 22 carbon atoms, preferably 7 to 20 carbon atoms; a bitumen composition comprising The aforementioned bitumen composition can be advantageously used in the manufacture of bitumen aggregate mixtures for road use. In particular, the aforementioned bitumen composition can be advantageously used in the manufacture of dense bitumen aggregate mixtures (e.g., surface layer, base layer, sub-base layer) or coarse bitumen aggregate mixtures (e.g., drainage, soundproofing material for surface layer) in the optional presence of recycled aggregate mixtures.

Inventors

  • 카나베시 엘리자베타
  • 스칼마니 아녜제 마리아 줄리아
  • 아미코 안토니오

Assignees

  • 에니 에스.피.에이.

Dates

Publication Date
20260511
Application Date
20240912
Priority Date
20230915

Claims (10)

  1. As a bituminous composition, the bituminous composition is: (a) at least one bitumen modified with an elastomeric copolymer; and (b) at least one mixture comprising lignin and a mixture of saturated and/or unsaturated vegetable fatty acids having 6 to 22 carbon atoms, preferably 7 to 20 carbon atoms; a bitumen composition comprising
  2. In claim 1, the bitumen composition is: (a) at least one bitumen modified with an elastomer copolymer, comprising 80% to 99% by weight, preferably 82% to 98.5% by weight, more preferably 84% to 98% by weight, based on the total weight of the bitumen composition; and (b) at least one mixture comprising lignin and a mixture of saturated and/or unsaturated vegetable fatty acids having 6 to 22 carbon atoms, preferably 7 to 20 carbon atoms, in an amount of 1 to 20 weight%, preferably 1.5 to 18 weight%, more preferably 2 to 16 weight%, based on the total weight of the bitumen composition.
  3. A bitumen composition according to claim 1 or 2, wherein the bitumen modified with the elastomer copolymer is selected from bitumen modified with a conjugated styrene-diene block copolymer, preferably a styrene-butadiene block copolymer or a styrene-isoprene block copolymer, and more preferably from bitumen modified with a radial type block copolymer containing polystyrene and polybutadiene blocks, i.e., a styrene-butadiene-styrene (SBS) block copolymer.
  4. A bitumen composition according to any one of claims 1 to 3, wherein the lignin is dry lignin in powder form having a particle size of 10 mesh to 500 mesh, preferably 20 mesh to 300 mesh.
  5. A bitumen composition according to any one of claims 1 to 4, wherein the vegetable fatty acid present in the mixture is selected from caprylic acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, and linoleic acid.
  6. A bitumen composition according to any one of claims 1 to 5, wherein the vegetable fatty acid mixture has a flash point of 150°C to 300°C, preferably 180°C to 280°C.
  7. A bitumen composition according to any one of claims 1 to 6, wherein the mixture comprises the lignin and the saturated and/or unsaturated vegetable fatty acid mixture having 6 to 22 carbon atoms, preferably 7 to 20 carbon atoms, in a weight ratio of 3:1 to 1:3, preferably 2.5:1 to 1:1.
  8. A method for preparing a bitumen composition containing lignin, wherein the method of preparation is: (a) a step of mixing at least one bitumen modified with an elastomer copolymer and at least one mixture comprising lignin and a mixture of saturated and/or unsaturated vegetable fatty acids having 6 to 22 carbon atoms, preferably 7 to 20 carbon atoms, at a temperature of 100°C to 200°C, preferably 110°C to 195°C, for 30 minutes to 10 hours, preferably 40 minutes to 9 hours, to obtain a first bitumen composition comprising lignin; and (b) optionally, mixing the first bitumen composition with at least one bitumen modified with an elastomer copolymer at a temperature of 100°C to 200°C, preferably 110°C to 195°C, for a time of 30 minutes to 10 hours, preferably 40 minutes to 9 hours, to obtain a second bitumen composition containing lignin; a manufacturing method comprising.
  9. A mixture comprising lignin and a mixture of saturated and/or unsaturated vegetable fatty acids having 6 to 22 carbon atoms, preferably 7 to 20 carbon atoms.
  10. A method for preparing a mixture comprising lignin and a mixture of saturated and/or unsaturated vegetable fatty acids having 6 to 22 carbon atoms, preferably 7 to 20 carbon atoms, wherein the method comprises: (i) mixing dry lignin in powder form with a mixture of saturated and/or unsaturated vegetable fatty acids having 6 to 22 carbon atoms, preferably 7 to 20 carbon atoms; and (ii) a step of heating the mixture obtained in step (i) at a pressure of 10 mbar to atmospheric pressure, preferably 50 mbar to atmospheric pressure, for a time of 1 minute to 6 hours, preferably 5 minutes to 4 hours, at a temperature of 15°C to 180°C, preferably 20°C to 140°C; comprising a method for manufacturing.

Description

Bitumen composition containing lignin and method for preparing the same The present invention relates to a bituminous composition containing lignin and a method for preparing the same. More specifically, the present invention relates to a bitumen composition comprising: (a) at least one bitumen modified with an elastomeric copolymer; and (b) at least one mixture comprising a mixture of lignin and vegetable fatty acids. The bituminous composition mentioned above can be advantageously used in the manufacture of bituminous conglomerates for road use. In particular, the bituminous composition mentioned above can be advantageously used in the manufacture of closed bituminous conglomerates (e.g., wearing courses, binders, sub-bases) or open bituminous conglomerates (e.g., drainage, soundproofing for wearing courses) in the optional presence of recycled conglomerates. The present invention also relates to a method for preparing a bitumen composition containing the aforementioned lignin. In addition, the present invention also relates to a mixture comprising lignin and a mixture of vegetable fatty acids, as well as a method for preparing the same. Typically, traditional bitumen or polymer-modified bitumen (PMB) is used in the production of conglomerates, that is, bitumen to which polymer materials, particularly elastomer copolymers, more particularly conjugated styrene-diene block copolymers, more particularly styrene-butadiene block copolymers or styrene-isoprene block copolymers, have been added. Bitumen compositions containing lignin are also known. For example, U.S. patent application US 2018/0346658 relates to a composition comprising bitumen, one or more plasticity modifying agents, lignin, and optionally one or more additional components; said lignin is obtained by a process of treating lignocellulosic biomass, said process comprising the following steps: (a) a step of applying the above lignocellulosic biomass to hydrothermal pre-treatment to produce hydrothermal pre-treated lignocellulosic biomass; and (b) a step of applying at least a portion of the hydrothermal pretreated lignocellulose biomass obtained in step (a) to hydrolysis to obtain a liquid fraction containing soluble carbohydrates and a fibrous fraction containing lignin, wherein the hydrolysis is acid-catalyzed hydrolysis and/or enzymatic hydrolysis; and (c) Optionally, applying at least a portion of the liquid fraction obtained in step (b) to fermentation to ferment at least a portion of the soluble carbohydrates into a fermentation product such as ethanol, methane, or butanol to obtain a fermentation broth. The aforementioned composition is described as having improved properties such as mixing properties and can be used for roads, pavements, waterproofing, asphalt roofing, adhesives, etc. European patent application EP 2918640 relates to a bitumen composition comprising lignin or a derivative thereof, wherein at least 10 weight percent of said lignin or a derivative thereof is molecularly dissolved in said bitumen composition. It is stated that said bitumen composition may be used for paving or roofing. The literature [Yao H. et al, in "Review on Applications of Lignin in Pavement Engineering: A Recent Survey", " Frontiers in Materials " (2022), Vol. 8 DOI: 10.3389/fmats.2021.803524] reports the use of lignin in three types of paving materials as follows: asphalt in which lignin can be used as a modifier, extender, emulsifier, antioxidant, and coupling agent; asphalt mixtures in which lignin can be used as an additive; and road base soils in which lignin can be used as a soil stabilizer. However, the use of lignin in bitumen compositions can have a negative effect on chemical-physical and rheological properties, such as penetration, softening point, storage stability, elastic recovery, and cohesion, as well as on performance when used in the manufacture of bitumen aggregate mixtures. To better understand and practically implement the present invention, some exemplary and non-limiting embodiments of the present invention are reported below. Analysis and characterization methods The analysis method shown in Table 1 below was used. characteristicmeasurement methodPenetration 25℃ (0.1 mm)EN 1426:2015Yeonhwajeom Ring and Ball (℃)EN 1427:2015Intrusion IndexAppendix A - UNI EN 12591:2009Fraass breaking point (℃)EN 12593:2015Elastoplasticity range (℃)EN 14023:2010 (Point 5.2.8.4)Dynamic viscosity at 160℃ (Pa/sec)EN 13702:2018Elastic recovery rate (%) at 25℃EN 13398:2018Cohesion at 10℃ (J/ cm² )EN 13589:2018 EN 13703:2004△ Circle method*(℃)EN 13399:2018Flash point open-type container ("Cleveland Open Cup") (℃)EN ISO 2592:2017RTFOT (Aging Resistance): Rate of change of mass (absolute value) (%) Residual penetration at 25℃ (%) Increase in softening point Hwan-gu-beop (℃)EN 12607-1:2015 EN 1426:2015 EN 1427:2015 * Difference in the ring method value between the top (head) (T) and bottom (bottom) (F) after storage at 180℃ for 3 days. Example 1 (Comparativ