WO2002070589A2 - Preparation of polymer nanocomposites by dispersion destabilization - Google Patents
Preparation of polymer nanocomposites by dispersion destabilization Download PDFInfo
- Publication number
- WO2002070589A2 WO2002070589A2 PCT/US2002/006055 US0206055W WO02070589A2 WO 2002070589 A2 WO2002070589 A2 WO 2002070589A2 US 0206055 W US0206055 W US 0206055W WO 02070589 A2 WO02070589 A2 WO 02070589A2
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- WIPO (PCT)
- Prior art keywords
- polymer
- clay
- dispersion
- clay mineral
- polymer dispersion
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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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/205—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase
- C08J3/21—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase the polymer being premixed with a liquid phase
- C08J3/215—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase the polymer being premixed with a liquid phase at least one additive being also premixed with a liquid phase
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Definitions
- the present invention generally relates to a polymer nanocomposite. More particularly, the invention relates to a polymer nanocomposite formed from a mixture of a clay dispersion with a polymer dispersion.
- Clay minerals such as montmorillonite are composed of silicate layers with a thickness of about 1 nanometer. Incorporation of such layered materials in polymers result in products which may frequently be referred to as nanocomposites. Incorporating clay minerals in a polymer matrix, however, may not always be a straightforward process. Incorporating clay minerals may require additional manufacturing steps or additional capital equipment costs, especially if melt processing may be required. Some have tried to improve the process of forming nanocomposites by increasing the compatibility between the clay minerals and the organic polymers.
- lipophilic compounds such as oniurn compounds
- a dispersion is produced having a layered silicate, a monomer, and a polymerization initiator.
- the monomer is polymerized to form the latex.
- This polymerization process results in a latex containing a layered material intercalated with a polymer.
- This method is disclosed in U.S. Patent No. 5,883,173 to Elspass et al., which is incorporated herein by reference.
- the approaches to preparing nanocomposites may prove difficult in controlling exfoliation and polymer molecular weight. Efficiency in emulsion polymerization may also be difficult to achieve.
- a clay mineral such as, but not limited to smectite clay minerals
- a clay mineral may be intercalated with a polymer by mixing a dispersion of a polymer in a liquid carrier and a dispersion of a clay mineral in a liquid carrier to form a dispersion mixture.
- the dispersion mixture may be treated with a flocculating agent.
- a dispersion of polymer in a liquid carrier may be prepared by any of the means available to those skilled in the art.
- the polymeric dispersion may be formulated by mixing a combination of a liquid carrier, a surfactant, and a polymer.
- a clay mineral dispersion may be produced by mixing a clay mineral with a liquid carrier such that the clay mineral is dispersed in the liquid carrier.
- a surfactant may be added when preparing a dispersion of a clay mineral in the liquid carrier.
- the two dispersions may be subsequently mixed together to produce a dispersion mixture of the polymer and the clay mineral.
- the dispersion mixture may then be flocculated by addition of a flocculating agent.
- flocculating agents may be, but are not limited to, inorganic salts, double-layered metal hydroxides, quaternary onium compounds, or an onium saturated clay mineral.
- An onium saturated clay mineral may be defined as a clay mineral that has been treated with a quaternary onium compound added in excess of that required to meet the Cation Exchange Capacity (CEC) of the clay mineral.
- CEC Cation Exchange Capacity
- a non-layered clay mineral may be substituted in the aforementioned compositions in place of a layered clay mineral.
- the flocculated nanocomposite material may be separated from the liquid carrier using techniques such as, but not limited to, filtration, centrifugation, or evaporation.
- the nanocomposite may be formulated, compounded, and processed for use in applications such as, but not limited to, plastic engineered parts, film, and fiber as well as rubber articles such as tires, belts, and hoses.
- Flocculation as defined herein , is the aggregation of colloidal particles suspended in water.
- Intercalation as defined herein is the movement of polymer between smectite layers, where the layers are separated, but the ordered relationship between the layers is maintained.
- the interlayer spacing can be measured by X-ray diffraction.
- Exfoliation as defined herein is the movement of polymer between the smectite layers, where the layers are separated and the ordered relationship between the layers is lost. In completely exfoliated examples, no X-ray diffraction results from the interlayer separations.
- Nanocomposite as defined herein is a composition comprising layered inorganic particles in a polymer matrix.
- a polymer dispersion may be prepared by dispersion of a polymer within a liquid carrier.
- the polymer dispersion may be prepared by adding an amount of polymer, up to about 80% by weight of polymer, to the liquid carrier.
- the liquid carrier may be either water, an organic solvent, or mixtures thereof.
- Polymers that may be used include, but are not limited to, the following examples: polyester, polyurethane, polyvinyl chloride, styrene-butadiene, acrylic rubber, chlorosulfonated polyethylene rubber, fluoroelastor ⁇ er, polyisoprene, polycarbonate resin, polyamide resin, polyolefin resin, thermoplastic resin or mixtures thereof.
- the polymer dispersion may be subjecting to a shearing process to fully disperse the polymeric material within the liquid carrier.
- a clay mineral dispersion may be prepared by adding from about 1% to about 10% by weight of a clay mineral to a liquid carrier.
- the liquid carrier may be either water, an organic solvent, or mixtures thereof.
- the clay mineral used may be naturally occurring or synthetic. Positively charged or negatively charged minerals may be used. Representative examples of negatively charged clay minerals useful in accordance with an embodiment may be as follows:
- R is selected from the group consisting of Na + , Li + , NH + , and mixtures thereof; Hectorite
- R is selected from the group consisting of Na + , Li + , NH 4 + , and mixtures thereof;
- Inorganic salts include, but are not limited to, any suitable Group I or Group II main group metal cation or any suitable transition metal cation that provides sufficient ionic charge to flocculate the dispersions. Any anion that provides sufficient solubility of the inorganic compound in the liquid carrier may be used. Examples of anions include, but are not limited to, chloride, bromide, iodide, sulfate, nitrate, perchlorate, chlorate, or phosphate. Examples of inorganic salts include, but are not limited to, calcium chloride, magnesium chloride, sodium chloride, potassium chloride, or lithium chloride. Mineral compounds include, but are not limited to, hydrotalcite.
- amine salts that may be used as a flocculant may include, but are not limited to, compounds having the following structure:
- R b R 2 , and R 3 may be independently hydrogen, alkyl, aryl, or alkylaryl groups.
- the alkyl, aryl, or alkylaryl groups may include carbon moieties of about 1 to about 20 carbon atoms and X may be chloride, bromide, iodide, nitrite, nitrate, hydroxide, sulfate, sulfite, phosphate or other suitable anionic substituents.
- the flocculating agent e.g., the onium compound
- the flocculating agent is thus added prior to forming the clay- polymer dispersion, rather than after.
- Mineral compounds may also be used as a flocculating agent.
- a polymeric dispersion and a clay mineral dispersion may be prepared as previously described.
- the clay mineral dispersion may be added to the polymeric dispersion without causing flocculation.
- the polymeric dispersion/clay mineral dispersion mixture may then be contacted with about 1 % to about 10% by weight of a mineral compound (e.g., hydrotalcite) to cause flocculation of the polymeric dispersion.
- a mineral compound e.g., hydrotalcite
- the clay mineral dispersion is added to the polymer dispersion to form a clay-polymer dispersion.
- the polymer dispersion may be added to the clay dispersion to form the clay-polymer dispersion.
- a polymer dispersion and a clay mineral dispersion may be prepared separately as described earlier. These dispersions may be mixed with sufficient shear to produce a clay-polymer dispersion as described earlier.
- To the clay-polymer dispersion, with mixing, may be added an inorganic salt at about 1% to about 20%) by weight of solution such that the clay-polymer dispersion may be flocculated.
- the produced nanocomposite may be processed as described in the previous sections.
- non-layered clay minerals may be utilized as well.
- non-layered clay minerals include, but are not limited to, sepiolite or attapulgite.
- X-ray diffraction may be used to determine the extent of exfoliation, or separation, of the mineral layers in the nanocomposite.
- the D 0 o ⁇ peak may be monitored and distance of the spacing between the platelets may be inferred.
- X-ray diffraction data may be used to determine intercalation and disorder of clay mineral particles incorporated within the polymer. Platelet spacing values may range from 1-2 A in an untreated clay mineral. In clays where the platelets are so well separated, such as in a nanocomposite, the D 0 o ⁇ peak may be absent in the x-ray scan.
- a surfactant may be added to the polymer dispersion to aid in dispersion of the polymer.
- Surfactants that may be used include amphoteric, anionic, cationic, and non-ionic.
- a surfactant may be added in an amount from about 1% to about 20% by weight of polymer.
- the nanocomposites herein described may be mixed with other materials to produce a number of different products or articles.
- the nanocomposite may be formulated, for example, into automobile tires.
- the nanocomposite may be added to impart improved performance of the automobile tire on ice by n ⁇ iimizing reinforcing performance of a tread rubber, while still improving the traction force by the elimination of hydroplaning and increasing the area of contact with a road surface.
- Paints may also be formulated with the nanocomposites described herein to improve desirable paint characteristics such as minimized sagging, luster, durability, thixotropy, and solids suspension.
- the nanocomposites described herein may be used in those specialty paint formulations especially designed to paint the polymeric • materials of automobile bumpers and the like.
- U.S. Patent Number 6,133,374 to Nam, et al. which is incorporated herein by reference, further describes the use of nanocomposites in paint formulations.
- the nanocomposites described herein may, for example, be used in melt extrusion of the nanocomposite into film.
- Formulation may be accomplished by feeding solid polymer to an extruder in which the polymer may be heated to a temperature above its melting point.
- a rotating screw pushes the polymer and the resulting viscous polymer melt through the extruder barrel into a die in which the polymer may be shaped to the desired form.
- the resulting extrudate may either be quenched or allowed to cool slowly to temperatures below the melting point, causing the extrudate to rigidity and assume the shape of the die orifice.
- a gapped coat hanger die may be used to lay a melt of modified polymerized organic system onto a roller.
- the film may then be fed through a nip roller and onto a take-up roll.
- Film may also be produced as a blown film by feeding the melt of the nanocomposites through an annular die, blowing air into the inside of the bubble, then collapsing the bubble and collecting on a roll-up spool.
- the film may be either a monolayer or multiple layer material.
- the nanocomposites may also improve the extrusion of the fibers similar to the elimination of melt fractures in commercial films.
- Injection molding processes may exhibit improvements in form release and more accurate replication of the molded product to the form.
- Blow molding processes may exhibit improved surface structure features.
- the following examples serve to illustrate methods of producing a nanocomposite by the previous embodiments. The examples should not be considered limiting.
- Example 2 was conducted as Example 1 except that Good-Rite SB-1168 (a latex polymer available from B.F. Goodrich) was utilized. The dispersion mixture flocculated. The D 00 ⁇ peak was present and indicated smectite clay platelet spacing of about 36 A.
- Good-Rite SB-1168 a latex polymer available from B.F. Goodrich
- Example 3 was conducted as Example 1 except that Good-Rite SB-1177 (a latex polymer available from B.F. Goodrich) was utilized. The dispersion mixture flocculated. The D 0 o ⁇ peak was present and indicated smectite clay platelet spacing of about 38 A.
- Good-Rite SB-1177 a latex polymer available from B.F. Goodrich
- EXAMPLE 4 A filtercake of an organoclay was prepared in the following way. A montmorillonite clay was exchanged with hydrogenated tallow alkyl(2-etl ⁇ ylhexyl)dimethyl ammonium metliylsulfate, (Arquad ® HTL8-MS, Akzo
- MER is a measure of milliequivalent ratio (MER), providing the relationship between the amount of a quaternary onium compound added to a clay based upon the cation exchange capacity of the clay.
- the slurry was filtered and the filtercake was processed by milling before use. The solids content of the filtercake was 47.40%.
- To 100 grams of Good-Rite SB-1168 was added 12.66 grams of the processed filtercake.
- a high speed disperser was employed for dispersion of the filtercake into Good-Rite SB-1168.
- the dispersion mixture flocculated.
- the solids were isolated and an x-ray diffraction analysis was conducted on the resulting nanocomposite. The D 0 o ⁇ peak was present and indicated smectite clay platelet spacing of about 28 A.
- EXAMPLE 5 A mixture of 97 g of deionized water and 3 grams of hydrotalcite were subj ected to a high energy disperser.
- the dispersion mixture flocculated.
- the solids were prepared for x-ray diffraction analysis.
- the Dooi peak indicated spacing of about 39.9 A.
- EXAMPLE 7 130 grams of a 3% aqueous montmorillonite slurry was added with stirring to 100 grams of Goodyear LPF-
- a 3% solids aqueous Cloisite ® dispersion was prepared with an excess of hydrogenated tallow alkyl(2- ethylhexyl)dimefhyl ammonium methylsulfate, (Arquad ® HTL8-MS, Akzo Chemical) to produce a 125 MER organoclay.
- the organoclay was passed through a Manton-Gaulin homogenizer at a setting of about 4,500 psig.
- To 100 grams of Goodyear LPF-6758 was added, with stirring, 180.7 grams of the aqueous Cloisite ® dispersion.
- the dispersion mixture flocculated.
- the solids were prepared for x-ray diffraction analysis.
- the D 0 o ⁇ peak indicated spacing of the clay platelets of about 39.2 A.
- EXAMPLE 9 A 3.06%) by weight aqueous organoclay slurry was made and passed through the Manton-Gaulin homogenizer at a setting of about 4,500 psig.
- the organoclay was a 125 MER organoclay with hydrogenated tallow alkyl(2-ethylhexyl)dimethyl ammonium methylsulfate, (Arquad ® HTL8-MS, Akzo Chemical).
- LPF-6758 was added, slowly and with stirring, 181.2 grams of the organoclay dispersion. A flock formed after 3 minutes of shearing.
- the solids produced were prepared for x-ray diffraction analysis.
- the D 0 o ⁇ peak indicated spacing of the clay platelets of about 37.1 A.
- EXAMPLE 10 About 50 grams of the nanocomposite produced in Example 9 was fed into a Brabender mixer over a period of two minutes and mixed for an additional 5 minutes at 150° C and at 60 rpm. The Brabender torque was measured during the mixing. The torque initially increased to about 36.1 Nm, and remained at that level during the 5 minute mixing. The material was removed and hot pressed for 5 minutes at 150° C. An x-ray diffraction analysis of the material was run. The D 0 o ⁇ peak was absent, indicating high exfoliation of the clay in the polymer.
- Example 12 is a control for comparison purposes. It is an aqueous dispersion 125 MER hydrogenated tallow alkyl(2-ethylhexyl)dimetl ⁇ yl ammonium methylsulfate, (Arquad ® HTL8-MS, Akzo Chemical) treated montmorillonite clay. An x-ray diffraction analysis of the material was run. The Dooi peak indicated spacing of the clay platelets of about 25.6 A.
- Example 13 is a control for comparison purposes. It is a dry dispersion 125 MER of hydrogenated tallow alkyl(2-ethylhexyl)dimethyl ammonium methylsulfate, (Arquad ® HTL8-MS, Akzo Chemical) treated montmorillonite clay. An x-ray diffraction analysis of the material was run. The D 0 o ⁇ peak indicated spacing of the clay platelets of about 23.7 A.
- Example 14 is a dried hydrotalcite. An x-ray diffraction analysis of the material was run. The D 00 ⁇ peak indicated spacing of the hydrotalcite platelets of about 8.6 A.
- MMT montmorillonite
- HTL8 hydrogenated tallow alkyl(2-ethylhexyl)dimetl ⁇ yl ammonium methylsulfate, (Arquad ® HTL8-MS,
- Example 5 the latex was added to the mineral. In all other examples, the mineral was added to the latex.
Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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DE60211129T DE60211129T2 (en) | 2001-03-02 | 2002-02-28 | PREPARATION OF POLYMERNANO FIBER MATERIALS BY DISPERSION DETESTILIZATION |
CA002439632A CA2439632A1 (en) | 2001-03-02 | 2002-02-28 | Preparation of polymer nanocomposites by dispersion destabilization |
EP02731107A EP1366109B1 (en) | 2001-03-02 | 2002-02-28 | Preparation of polymer nanocomposites by dispersion destabilization |
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US27327101P | 2001-03-02 | 2001-03-02 | |
US60/273,271 | 2001-03-02 |
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WO2002070589A3 WO2002070589A3 (en) | 2003-05-01 |
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US (1) | US6849680B2 (en) |
EP (1) | EP1366109B1 (en) |
AT (1) | ATE325155T1 (en) |
CA (1) | CA2439632A1 (en) |
DE (1) | DE60211129T2 (en) |
WO (1) | WO2002070589A2 (en) |
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- 2002-02-28 AT AT02731107T patent/ATE325155T1/en not_active IP Right Cessation
- 2002-02-28 EP EP02731107A patent/EP1366109B1/en not_active Expired - Lifetime
- 2002-02-28 WO PCT/US2002/006055 patent/WO2002070589A2/en active IP Right Grant
- 2002-02-28 CA CA002439632A patent/CA2439632A1/en not_active Abandoned
- 2002-02-28 DE DE60211129T patent/DE60211129T2/en not_active Expired - Fee Related
- 2002-02-28 US US10/086,173 patent/US6849680B2/en not_active Expired - Fee Related
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Cited By (7)
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EP1471108A1 (en) * | 2003-04-25 | 2004-10-27 | Rohm And Haas Company | Composite compositions including polymeric nanoparticles and clay nanoparticles |
US7244781B2 (en) | 2003-04-25 | 2007-07-17 | Rohm And Haas Company | Composite compositions including polymeric nanoparticles and clay nanoparticles |
WO2006085957A3 (en) * | 2004-07-06 | 2007-03-22 | Exxonmobil Chem Patents Inc | Polymeric nanocomposites and processes for making the same |
JP2008506009A (en) * | 2004-07-06 | 2008-02-28 | エクソンモービル・ケミカル・パテンツ・インク | Polymer nanocomposites |
US8980978B2 (en) | 2004-07-06 | 2015-03-17 | Exxonmobil Chemical Patents Inc. | Polymeric nanocomposites and processes for making the same |
EP3500770B1 (en) | 2016-08-17 | 2022-10-05 | ContiTech Luftfedersysteme GmbH | Article, particularly an air spring bellows, a metal-rubber element, or a vibration damper |
EP3500771B1 (en) | 2016-08-17 | 2022-11-02 | ContiTech Elastomer-Beschichtungen GmbH | Rubber mixture and elastomeric article having flame-retardant properties |
Also Published As
Publication number | Publication date |
---|---|
US6849680B2 (en) | 2005-02-01 |
EP1366109B1 (en) | 2006-05-03 |
DE60211129T2 (en) | 2007-05-03 |
US20020165305A1 (en) | 2002-11-07 |
CA2439632A1 (en) | 2002-09-12 |
DE60211129D1 (en) | 2006-06-08 |
WO2002070589A3 (en) | 2003-05-01 |
ATE325155T1 (en) | 2006-06-15 |
EP1366109A2 (en) | 2003-12-03 |
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