US9102801B1 - Lignin nanoparticle synthesis - Google Patents
Lignin nanoparticle synthesis Download PDFInfo
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- US9102801B1 US9102801B1 US13/597,928 US201213597928A US9102801B1 US 9102801 B1 US9102801 B1 US 9102801B1 US 201213597928 A US201213597928 A US 201213597928A US 9102801 B1 US9102801 B1 US 9102801B1
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- GDPFSXBOPUAHAU-UHFFFAOYSA-N C.CCCCCC(=O)OC(=O)CCCCC.CCCCCC(=O)OCC(C)C(OC(=O)CCCCC)C1=CC(OC)=C(CC(COC(=O)CCCCC)C(OC2=C(OC)C=C(C(OC(=O)CCCCC)C(C)COC(=O)CCCCC)C=C2)C2=CC=C(OC(=O)CCCCC)C(OC)=C2)C=C1.COC1=CC(C(OC2=C(OC)C=C(C(O)C(C)CO)C=C2)C(CO)CC2=C(OC)C=C(C(O)C(C)CO)C=C2)=CC=C1O Chemical compound C.CCCCCC(=O)OC(=O)CCCCC.CCCCCC(=O)OCC(C)C(OC(=O)CCCCC)C1=CC(OC)=C(CC(COC(=O)CCCCC)C(OC2=C(OC)C=C(C(OC(=O)CCCCC)C(C)COC(=O)CCCCC)C=C2)C2=CC=C(OC(=O)CCCCC)C(OC)=C2)C=C1.COC1=CC(C(OC2=C(OC)C=C(C(O)C(C)CO)C=C2)C(CO)CC2=C(OC)C=C(C(O)C(C)CO)C=C2)=CC=C1O GDPFSXBOPUAHAU-UHFFFAOYSA-N 0.000 description 1
- SVADOUCXMZVEOB-UHFFFAOYSA-N C=C(C)C(=O)OCCCO(C)[SiH](OC)OC.C=C(C)C(=O)OCCC[Si](C)(OC)OCC(C)C(O[Si](C)(C)CCCOC(=C)C(C)=O)C1=CC(OC)=C(CC(CO[Si](C)(CCCOC(=O)C(=C)C)OC)C(OC2=C(OC)C=C(C(O[Si](C)(CCCOC(=O)C(=C)C)OC)C(C)CO[Si](C)(CCCOC(=O)C(=C)C)OC)C=C2)C2=CC=C(O[Si](CCCOC(=O)C(=C)C)(OC)OC)C(OC)=C2)C=C1.COC1=CC(C(OC2=C(OC)C=C(C(O)C(C)CO)C=C2)C(CO)CC2=C(OC)C=C(C(O)C(C)CO)C=C2)=CC=C1O Chemical compound C=C(C)C(=O)OCCCO(C)[SiH](OC)OC.C=C(C)C(=O)OCCC[Si](C)(OC)OCC(C)C(O[Si](C)(C)CCCOC(=C)C(C)=O)C1=CC(OC)=C(CC(CO[Si](C)(CCCOC(=O)C(=C)C)OC)C(OC2=C(OC)C=C(C(O[Si](C)(CCCOC(=O)C(=C)C)OC)C(C)CO[Si](C)(CCCOC(=O)C(=C)C)OC)C=C2)C2=CC=C(O[Si](CCCOC(=O)C(=C)C)(OC)OC)C(OC)=C2)C=C1.COC1=CC(C(OC2=C(OC)C=C(C(O)C(C)CO)C=C2)C(CO)CC2=C(OC)C=C(C(O)C(C)CO)C=C2)=CC=C1O SVADOUCXMZVEOB-UHFFFAOYSA-N 0.000 description 1
- ODKJPHVBGMWTNU-DGDBOHJLSA-N COC1=C(O)C(C)=CC(/C=C/CO)=C1.COC1=C(O)C=CC(/C=C/CO)=C1.OC/C=C/C1=CC=C(O)C=C1 Chemical compound COC1=C(O)C(C)=CC(/C=C/CO)=C1.COC1=C(O)C=CC(/C=C/CO)=C1.OC/C=C/C1=CC=C(O)C=C1 ODKJPHVBGMWTNU-DGDBOHJLSA-N 0.000 description 1
- HQOQOXAFYQYKGW-UHFFFAOYSA-N COC1=CC(C(OC2=C(OC)C=C(C(O)C(CO)OC)C=C2)C(CO)CC2=C(OC)C=C(C(O)C(CO)OC)C=C2)=CC=C1O Chemical compound COC1=CC(C(OC2=C(OC)C=C(C(O)C(CO)OC)C=C2)C(CO)CC2=C(OC)C=C(C(O)C(CO)OC)C=C2)=CC=C1O HQOQOXAFYQYKGW-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08H—DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
- C08H6/00—Macromolecular compounds derived from lignin, e.g. tannins, humic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/315—Compounds containing carbon-to-nitrogen triple bonds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L97/00—Compositions of lignin-containing materials
- C08L97/005—Lignin
Definitions
- Modern tires are generally made of synthetic rubber, natural rubber, fabric and wire, along with other materials and/or fillers that reinforce the rubber.
- Tires consist of a tread and a body. The tread provides traction while the body ensures support.
- the majority of tires are pneumatic inflatable structures, including a doughnut-shaped body of cords and wires encased in rubber and generally filled with compressed air to form an inflatable cushion.
- Pneumatic tires are used on many types of vehicles, such as cars, bicycles, motorcycles, trucks, earthmovers, and aircraft.
- Carbon black is a by-product produced by the incomplete combustion of heavy petroleum products such as fluid catalytic cracking (FCC) tar, coal tar, ethylene cracking tar, and a small amount from vegetable oil. Carbon black is a form of amorphous carbon that has a relatively high surface-area-to-volume ratio. Carbon black is used as a filler in plastic and rubber, principally pigment and reinforcement properties, particularly as a reinforcing filler in rubber products, especially tires. While a pure gum vulcanizate of styrene-butadiene (synthetic rubber) has a tensile strength on the order of up to 2.5 megapascals (MPa), it has very little abrasion resistance.
- FCC fluid catalytic cracking
- coal tar coal tar
- ethylene cracking tar a form of amorphous carbon that has a relatively high surface-area-to-volume ratio.
- Carbon black is used as a filler in plastic and rubber, principally pigment and reinforcement properties, particularly as
- Carbon black is also used in other automotive products (e.g., belts, hoses), in the Aerospace industry in elastomers for aircraft vibration control components such as engine mounts, and in various other plastic products.
- Lignin is a biopolymer found in woody plants. Lignin may be defined as an amorphous, polyphenolic material produced from enzymatic dehydrogenative polymerization of generally three principal phenylpropanoid monomers: (1) p-coumaryl alcohol, (2) coniferyl alcohol and (3) sinapyl alcohol.
- Lignin is produced generally as a by-product in wood processing.
- lignin is typically required to be removed from wood pulp when the wood pulp is used for papermaking.
- lignin may be recovered from wood pulp by various processes and thus, the nature of an individual lignin depends somewhat upon its plant of origin and recovery process.
- lignin recovery processes include by solvent extraction from wood meal, (e.g., “native lignin” or “Brauns lignin”); by cellulolytic enzyme treatment of finely ground wood meal followed by solvent extraction (e.g., cellulolytic enzyme lignin); by treatment of woody material with dioxane/dilute HCl (e.g., dioxane acidolysis lignin); by solvent extraction and purification of finely ground wood meal (e.g., milled wood lignin); by strong acid degradation of woody materials (e.g., Klason lignin); by successive treatments of woody material with sodium periodate followed by boiling water (e.g., periodate lignin); by reaction with sodium hydroxide and Na 2 S at an elevated temperature followed by isolation through acidification or ultrafiltration (e.g.,
- lignin is made soluble by sulfonation at benzyl alcohol, benzyl aryl ether and benzyl ether linkages of phenyl propane units.
- Lignosulfonates may then be isolated by the addition of a base such as sodium hydroxide, magnesium hydroxide, calcium hydroxide and ammonia. Lignosulfonates have been proposed for use as a filler for tires and as a substitute for carbon black.
- a method of forming a composite structure including lignin particles and a polymer is described.
- the lignin particles have an average particle size of less than 40 nanometers and, in another embodiment, an average particle size of 10 nanometers or less.
- a method of reducing lignin particles by mechanical means is also described.
- Commercially available lignin is generally comprised of lignin particles having an average particle size on the order of 1 micrometer to 200 micrometers or more. Reducing the particle size to less than 40 nanometers and, in another embodiment, to 10 nanometers or less, will increase the surface area of the lignin particles and improve its dispersive property with a polymer in a composite structure.
- lignin particles of a reduced particle size will have improved interaction with the synthetic or natural rubber and possible additional components (e.g., carbon black) to, in one embodiment, improve the reinforcing property of the lignin and optional other components in the tire.
- the reduced sized lignin particles may be combined with other polymeric materials as a reinforcing agent in the formation of other structures including, but not limited to, synthetic plastics (e.g., molded plastic structures) and biocompatible synthetic or biopolymers in medical applications (e.g., drug delivery devices or drug delivery agents).
- a method of forming a modified lignin is described as is forming a composite with a modified lignin and a polymer.
- a modified lignin in one embodiment, can be made to have an increased solubility in organic solvents and may also increase its dispersive property (i.e., its blend inclusion) with a polymeric material.
- the apparatus includes a polymer and lignin wherein the lignin has an average particle size of less than 40 nanometers and, in another embodiment, an average 10 nanometers or less.
- a representative polymer may be synthetic rubber and a representative composite may be a tire.
- the lignin may be modified to impart functional groups to the lignin to increase its solubility and/or its dispersive properties with the polymer.
- FIG. 1 shows a possible reaction mechanism of lignin with a diazonium salt to impart functionality to the lignin.
- lignin particles such as lignosulfonates typically have an average particle size on the order of 1 to 200 microns.
- a polymer such as synthetic rubber (e.g., styrene-butadiene)
- particles of this size tend to agglomerate which can reduce a tensile stress of a composite.
- lignin having an average particle size of less than 40 nanometers and, in another embodiment, having an average particle size of 10 nanometers or less is described.
- Prior art techniques for reducing a particle size of lignin relied on chemical mechanisms (e.g., acid digestion).
- a technique for reducing the size of a lignin particle from, for example, 1 to 200 microns or less than 40 nanometers (e.g., 10 nanometers or less) is mechanical means such as ball milling.
- the lignin particles are exposed to mechanical degradation through a ball milling process that results in particles of smaller size.
- One suitable ball milling process is exposing 100 g of a commercially available lignin, such as lignosulfonates commercially available as Vanisperse CB from Borregaard Ligonotech, to zirconite balls (e.g., one centimeter diameter) in a batch process.
- a mechanical degradation process such as ball milling also tends to remove sulfonate groups from the lignin which tends to increase a solubility of the reduced-size lignosulfonate particles in organic solutions.
- the increased solubility greatly improves dispersion (blend inclusion) within, for example, a polymer, including but not limited to, natural or synthetic rubber (e.g., styrene butadiene).
- the following example describes two representative ball milling processes using different ball-based mills.
- Lignosulfonate (1 g) was dried at 150° C. overnight to remove any residual moisture.
- the lignin was then transferred to a Wig-L-Bug mill and milled for 4 minutes. The mill operated with the sample vial swinging in a 6.5° arc at 3200 rpm.
- the dark black/brown lignin was a light brown color and very soluble in toluene.
- Lignosulfonate 100 g was dried at 150° C. overnight to remove any residual moisture.
- the lignin was then transferred to the grinding reservoir of a planetary mill (Restec p100) (500 ml Y Zr O2). Grinding medium was added such that the volume was equal to half of the lignin.
- the mill was operated at 650 rpm for 24 hours. The direction of milling was reversed every minute.
- the dark black/brown lignin was a light brown color and very soluble in in toluene.
- the lignin particles having an average particle size of less than 40 nanometers such as lignin particles having an average particle size of 10 nanometers or less is combined with styrene-butadiene and/or other elastomers in a composite to form a tire.
- the lignin may be the only filler combined with styrene-butadiene (e.g., in a range of 10 parts by weight lignin per 100 parts by weight elastomer(s) (“phr”) to 60 phr).
- lignin may be combined with another filler material such as carbon black.
- Carbon black contains graphite which has a layered planar structure with each layer having carbon atoms arranged in a hexagonal lattice.
- the hexagonal lattice arrangement creates step edges in the graphite structures.
- the polymer chains of the lignin are attracted to the step edges and, without wishing to be bound by theory, interact with the graphite. Reducing a particle size of lignin particles to an average particle size of less than 40 nanometers, increases the surface area of the lignin. The increased surface area increases interaction with the graphite of carbon black, which increases the dispersibility of the lignin in the composite as well as the reinforcement property of the two fillers.
- Representative combinations of lignin with carbon black in a composite with styrene-butadiene and/or other elastomers to form a tire are a ratio of 10 percent to 90 percent by weight lignin to carbon black and representative ranges of the combination filler to elastomer(s) is 10 phr to 60 phr.
- the lignin particles may be functionalized.
- Resident moieties of lignin include at least one of hydroxyl, methoxyl, carbonyl, and carboxy moieties as well as aromatic moieties and may or may not contain a sulfonate group.
- Functionalized lignin is described in U.S. patent application Ser. No. 12/684,231 (published as Publication No. 2010/0204368), titled “Functionalized Lignin, Rubber Containing Functionalized Lignin and Products Containing Such Rubber Composition,” which is incorporated herein by reference.
- Such functionalized lignin may be obtained, for example, by esterification of the lignin to form lignin ester and by silylation of one or more of the resident moieties to form silylated lignin.
- an ester or acrylate capping agent reacts with resident moieties, particularly, hydroxyl groups, of the lignin to form the functionalized lignin.
- the following illustrates the reaction of a lignin (a polycondensation of coniferyl alcohol) with a hexanoic ester capping agent. The illustration shows the capping agent reacts with residual hydroxyl moieties of the lignin.
- a starting material of a lignosulfonate e.g., Vanisperse CB
- a lignosulfonate e.g., Vanisperse CB
- an ester capping agent e.g., acidic anhydride, valeric anhydride, hexanoic anhydride
- a catalyst e.g., a zinc chloride catalyst
- an esterification of lignosulfonate may be achieved through a transesterification reaction with, for example, ethyl acetate, glycerol triacetate, or methyl caprate in the presence of a catalyst (e.g., p-toluene sulfonic acid).
- a catalyst e.g., p-toluene sulfonic acid
- functionalized lignin may be prepared by esterifying a lignosulfonate with methyl esters, methyl caprate or methyl laurate.
- a functionalized lignin in a form of a silylated lignin may be prepared by reacting a lignosulfonate with a capping agent that is in the form of an alkoxysilane or an organoalkosilane, such as alkylalkoxysilane or arylalkoxysilane, or arylalkylalkoxysilane.
- Functionalized lignin in a form of silylated lignin may be prepared by reacting a lignosulfonate with a capping agent such as isobutyltrimethoxysilane, 3-(trimethoxysilyl)propane-1-thiol, or 3-(dimethoxysilyl)propane-1-thiol in a solvent (e.g., a toluene solvent).
- a solvent e.g., a toluene solvent
- the following illustrates the reaction of a lignin (a polycondensation of conferyl alcohol) with 3-(trimethoxysilyl)propane-1-thiol capping agent.
- the illustration shows the capping agent reacts with residual hydroxyl moieties of the lignin.
- functionalization of lignin with an ester or silylation capping agent may occur while the particle size of the lignin is being reduced or after a reduction to less than 40 nanometers.
- a functionalized lignin may be prepared by modifying the lignin with diazonium salts.
- Such functionalization of lignin may include functionalization to increase solubility in organic solvents and/or to dispersion properties (e.g., increased blend inclusion) with organic polymers in combinations to form composites. Other functionalization objectives may also be achieved.
- modification of lignin may be applied to commercially available lignin or lignin that has been reduced in particle size by a mechanical means such as the particle sizes on the order of 40 nanometers or less (e.g., on the order of 10 nanometers or less) through a mechanical process such as ball milling as described above.
- the lignin can be functionalized with diazonium salts while milling as well.
- functionalization of lignin is achieved by exposing a lignin starting material (e.g., commercially available lignin or lignin reduced in particle size as described above and/or previously functionalized with an ester or silylation capping agent) to a diazonium salt in solution with an electrolyte such as a tetrabutylammonium cation.
- a lignin starting material e.g., commercially available lignin or lignin reduced in particle size as described above and/or previously functionalized with an ester or silylation capping agent
- an electrolyte such as a tetrabutylammonium cation.
- the diazonium salt is reduced by electrons in the lignin structure, particularly the aryl groups in the lignin.
- Exposing lignin to an organic diazonium salt such as an organic aryl diazonium with a tetrabutyl ammonium fluoride counterion produces an electron transferred from an aryl group in the lignin and generates an aryl radical upon loss of N 2 .
- a proton is also generated that eliminates HBF 4 .
- the aryl radical covalently bonds to the aryl group of the lignin to functionalize the lignin.
- the following example describes two representative diazotization processes using two different acids.
- the modification introduces functionality to the lignin and can be a method to impart functional groups like olefins, epoxides, esters, acrylates, halides, thiols, carbonates, nitriles and carboxylic acids to the lignin.
- Increasing an amount of diazonium precursor increases such lignin functionality.
- the functionality may include adding moieties that tend to increase the solubility of the lignin in organic solvents and/or increase the dispersion of the modified lignin in a composite.
- the lignin that is modified may be lignin particles or mechanically reduced in size as described above for commercially available lignin or lignin going to a mechanical particle size reduction process.
- lignin functionalized with the diazonium salt process described is not limited to functionalizing for purposes for use in tire applications but that the functionalized lignin can have other applications, including in combinations with other polymers.
- the lignin may be functionalized through diazonium salt process such as described with a drug or other treatment agent.
- Such lignin can be added to a formulation to be administering to a mammal, such as a formulation including a biopolymer designed for controlled release of the treatment agent or sustained retention of the formulation at a treatment location.
- Examples include drug delivery (e.g., drug delivery devices or delivery agents such as controlled release formulations including biocompatible polymers), and molded plastic.
- drug delivery e.g., drug delivery devices or delivery agents such as controlled release formulations including biocompatible polymers
- molded plastic e.g., molded plastic.
- the scope of the invention is not to be determined by the specific examples provided above but only by the claims below.
- well-known structures, devices, and operations have been shown in block diagram form or without detail in order to avoid obscuring the understanding of the description. Where considered appropriate, reference numerals or terminal portions of reference numerals have been repeated among the FIGURES to indicate corresponding or analogous elements, which may optionally have similar characteristics.
Abstract
Description
Claims (19)
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180037598A1 (en) * | 2015-02-18 | 2018-02-08 | Nutech Ventures | Methods of making and using lignin derivatives |
CN109320738A (en) * | 2018-09-30 | 2019-02-12 | 杭州市第人民医院 | A method of preparing lignin nanoparticle |
WO2020109671A1 (en) | 2018-11-29 | 2020-06-04 | Aalto University Foundation Sr | Lignin particle based hydrogel and the method for preparation of lignin colloidal particles by solvent evaporation process |
US10800891B1 (en) | 2016-03-08 | 2020-10-13 | National Technology & Engineering Solutions Of Sandia, Llc | Conversion of lignin into a water-soluble polyacid using a MOF catalyst |
US11053377B2 (en) * | 2017-01-24 | 2021-07-06 | Bridgestone Corporation | Rubber compounds for pneumatic tyre parts comprising lignin as dispersing agent |
CN113461978A (en) * | 2021-07-06 | 2021-10-01 | 天津科技大学 | Preparation method for preparing high-yield lignin nanoparticles with assistance of ball milling pretreatment |
US11203702B1 (en) | 2019-10-17 | 2021-12-21 | National Technology & Engineering Solutions Of Sandia, Llc | Functionalized coating polymers and uses thereof |
US11332371B2 (en) | 2016-11-08 | 2022-05-17 | University Of Guelph | Methods for creation of sub-micron biocarbon materials from biomass and their fields of application |
CN115386102A (en) * | 2022-08-19 | 2022-11-25 | 广州大学 | Phosphorized lignosulfonate nanoparticle and preparation method and application thereof |
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