Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
  • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
  • C09C1/28—Compounds of silicon
  • C09C1/30—Silicic acid
  • C09C1/3081—Treatment with organo-silicon compounds
• • 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
  • C08K9/00—Use of pretreated ingredients
  • C08K9/04—Ingredients treated with organic substances
  • C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
  • C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
  • C07F7/02—Silicon compounds
  • C07F7/08—Compounds having one or more C—Si linkages
  • C07F7/18—Compounds having one or more C—Si linkages as well as one or more C—O—Si linkages
  • C07F7/1804—Compounds having Si-O-C linkages
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
  • C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
  • C07F7/02—Silicon compounds
  • C07F7/08—Compounds having one or more C—Si linkages
  • C07F7/18—Compounds having one or more C—Si linkages as well as one or more C—O—Si linkages
  • C07F7/1804—Compounds having Si-O-C linkages
  • C07F7/1872—Preparation; Treatments not provided for in C07F7/20
  • C07F7/1892—Preparation; Treatments not provided for in C07F7/20 by reactions not provided for in C07F7/1876 - C07F7/1888
• • 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
  • C08K3/36—Silica

Definitions

• the invention relates to a process for the preparation of a silane, a process for the modification of a silicic acid with the silane and a modified silicic acid.
• Silanes are known as additives for rubber compounds, in particular for vehicle tires, in particular for rubber mixtures containing at least one
• Silica as filler Silanes known in the art are disclosed, for example, in DE 2536674 C3 and DE 2255577 C3.
• the silicic acid is attached to the polymer (s) by means of such silanes, whereby the silanes are also referred to as coupling agents.
• silane by means of silane coupling agents, there are advantages in terms of rolling resistance behavior and the processability of the rubber mixture.
• the silane usually has at least one sulfur grouping on the
• Vulcanization of the rubber mixture is involved.
• Rubber mixture especially when used in vehicle tires, an important role, in particular the rigidity of the mixture, the u. a. affects the handling behavior of the vehicle tire.
• Urea group is here in the so-called spacer, ie the spacer group between Silicon (attachment to the filler) and sulfur (attachment to the diene rubber) included.
• the silane is intended to be used in a rubber composition, in particular for
• the object is achieved by the inventive method according to claim 1 and 11, the inventive silane according to claim 10 and the modified silica according to the invention according to claim 12.
• Aralkyl groups preferably -C13H27 alkyl group
• radicals R 2 are linear or branched alkyl groups having 1 to 20
• step e) optionally purification of the silane obtained in step d) according to formula I).
• a silica is prepared, which is modified with the silane according to the invention. This provides a form of silane which is particularly suitable for giving it one
• aromatic groups A are selected from the group consisting of phenyl, naphthyl, pyridyl, pyridazyl, pyrimidyl, pyrazyl, triazyl, quinolyl, pyrrole, furan, thiophene, pyrazole , Imidazole, thiazole and oxazole residues.
• the linking of said groups to the respective aromatic group can take place via all conceivable atoms, in particular carbon atoms, of the aromatic skeleton.
• a monocyclic aromatic with six skeletal atoms such as a phenyl radical is called z. B. that the groups can be arranged in para-, meta- or ortho position to each other.
• all A on each side of the molecule are phenyl radicals.
• the radicals R 1 of the silane according to the invention can be present within the silyl groups and are the same or different on both sides of the molecule and are selected from alkoxy groups having 1 to 10 carbon atoms, cycloalkoxy groups having 4 to 10 carbon atoms, phenoxy groups having 6 to 20 carbon atoms,
• Alkylpolyether groups -O- (R 6 -O) r -R 5 where R 6 are identical or different and are branched or unbranched, saturated or unsaturated, aliphatic, aromatic or mixed aliphatic / aromatic C 2 -C 30 -hydrocarbon groups, preferably -CH 2 - CH 2, r is an integer from 1 to 30, preferably 3 to 10, and R 5 are unsubstituted or substituted, branched or unbranched, monovalent alkyl, alkenyl, aryl or aralkyl groups, preferably -C 13 H 27 alkyl group
• radicals R 1 can be bridged via radicals R 1 . All mentioned radicals R 1 and linkages can be combined with one another within a silyl group.
• R 1 groups include alkyl groups of 1 to 6 carbon atoms or alkoxy groups of 1 to 6 carbon atoms or halides, particularly preferred are alkoxy groups of 1 to 6 carbon atoms.
• radicals R 1 are within a silyl group same and alkoxy groups with 1 or 2
• radicals R 2 of the silane prepared according to the invention are linear or branched alkyl groups having 1 to 20 carbon atoms or cycloalkyl groups having 4 to 12 carbon atoms or aryl groups having 6 to 20 carbon atoms or
• the grouping Sk represents a sulfide bridge of k sulfur atoms, with the k sulfur atoms in a row, so that the molecule is a polysulfidic
• the index k is an integer greater than or equal to 2.
• K is preferably an integer from 2 to 10 (including 2 and 10), more preferably 2 to 8, most preferably 2, 3 or 4.
• the S 2 group of the molecule from the steps a) to e) is thus subjected to a further sulphurization in a further process step s), whereby the Sk group is formed with k> 2.
• the silane prepared according to the invention can also be present as a mixture with different values for k.
• all R 1 are ethoxy groups
• the R 2 are propyl radicals
• k 2.
• silane prepared according to the invention has the following formula V): V)
• silane according to formula V) represents a preferred example produced according to process steps a) to d) or e) according to the invention.
• Amino groups in /? Ara position (1,4-substitution on the aromatic) are arranged to each other.
• the organic solvent is according to a preferred embodiment of the invention dichloromethane (DCM).
• the reaction is preferably carried out at room temperature (RT) and preferably brought about by adding the functionalized silane (R 1 ) 0 Si-R 2 -NCO dropwise to the solution of the diamino-substituted aromatic H 2 N-A-NH 2 .
• the product is preferably dried under vacuum.
• the reaction is preferably carried out at room temperature (RT) and preferably brought about by adding a saturated ethanolic iodine solution dropwise to a Solution of the thiol is given.
• RT room temperature
• the addition is preferably carried out just until the reaction mixture is a pale yellow color due to excess iodine.
• the product is preferably dried under vacuum.
• the organic solvent in step c) is preferably
• the reaction is preferably carried out at 0 ° C.
• the activator, z As the oxalyl chloride, added dropwise to the suspension of the disulfide and stirred for 30 min at 0 ° C. It is then preferably stirred for 3 h at RT.
• solvent and excess activator are preferably under
• the reaction product thus obtained can be used in the next step without further purification.
• step d) the reaction of at least two equivalents of the substance from step a) with one equivalent of the substance from step c), wherein a solution of the substance from step a) in an organic solvent with a solution of the substance from step c) at Room temperature is brought into contact and then for 4 to 18 Hours, preferably 6 to 18, particularly preferably 6 to 12 hours, is stirred, whereby a silane according to formula I) is obtained.
• step d) is preferred for both substances (from a) and c)) THF.
• the reaction is preferably carried out at RT and thereby brought about that a solution of the disulfide from step c) is added dropwise to a solution of the substance from step a).
• the resulting suspension is then preferably stirred for 6 to 12 hours and then filtered off, whereby a silane according to formula I) is prepared.
• the purification of the silane obtained in step d) according to formula I) takes place, the type of purification being determined by whether the silane is obtained as a solid.
• the filter cake, after filtering is preferably washed with cold THF and cold demineralized water, "cold” also preferably having a temperature of 0 to + 8 ° C.
• drying of the product, silane is preferably carried out according to formula I), at a vacuum.
• silane produced without a purification step such as growing on silica, as described below.
• silane of the formula I) prepared according to the invention is preferably applied to silica in further process steps according to the invention, whereby it is provided in a form which is particularly suitable for producing the silane of a silane
• the method according to the invention comprises the following further method steps: f) dissolving the purified silane obtained in process step d) or e) in an organic solvent;
• step f) contacting at least one silica with the solution from step f) and then stirring the resulting suspension, preferably for 30 minutes to 18 hours, in particular for 6 to 18 hours;
• silica and silica "are used synonymously in the context of the present invention.
• the silica can be the silicas known to those skilled in the art which are suitable as a filler for tire rubber mixtures. However, it is particularly preferred if a finely divided, precipitated silica is used which has a nitrogen surface area (BET surface area) (in accordance with DIN ISO 9277 and DIN 66132) of 35 to 400 m 2 / g, preferably from 35 to 350 m 2 / g, more preferably from 100 to 320 m 2 / g and most preferably from 120 to 235 m 2 / g, and a CTAB surface area (according to ASTM D 3765) of from 30 to 400 m 2 / g, preferably from 30 to 330 m 2 / g, particularly preferably from 95 to 300 m 2 / g and very particularly preferably from 115 to 200 m 2 / g.
• BET surface area nitrogen surface area
• CTAB surface area accordinging to ASTM D 3765
• Such silicas lead z. B. in rubber blends for inner tire components to particularly good physical properties of the vulcanizates.
• silicas can thus z. B. both those of the type Ultrasil® VN3
• the dissolved silane obtained in process step d) or e) is dissolved in an organic solvent.
• the organic solvent in step f) is preferably DMF.
• at least one silicic acid is brought into contact with the solution from step f), followed by stirring of the resulting suspension, preferably for 30 minutes to 18 hours, particularly preferably 4 to 18 hours, again preferably 6 to 18 hours. Preference is stirred at a temperature of 120 ° C.
• the desired weight ratio of silane to silica is set.
• the silica can optionally also be brought into contact with the silane in the form of a suspension in an organic solvent, for example DMF.
• the drying of the modified silica obtained takes place.
• the solvent is preferably removed under reduced pressure and the product is then preferably dried for 1 to 3 days under reduced pressure at 20 to 60 ° C.
• the predried, modified silica may optionally be comminuted. Subsequently, the silica is preferably dried for 1 to 3 more days at 20 to 60 ° C under vacuum.
• This silica is especially useful as an additive for rubber compounds for
• Tire suitable whereby the combination of the silane on the silica results in a simplified processability of the mixture and the mixture also due to the silane according to formula I) has a higher and thus improved rigidity.
• the invention is based on the synthesis of silanes according to formula IV) and
• reaction mixture was then filtered through Buchner funnels and the residue was washed with cold demineralised water (4 x 50 mL) and cold ethanol (4 x 50 mL) to remove the excess iodine.
• the target compound was isolated as a white powder (6.69 g, 21.8 mmol, 90%).
• the target compound in the form of a slightly gray solid (extrapolated for the entire product: 15.96 g, 44.9 mmol, 97% based on silane) were isolated.
• the silane of formula IV) prepared is preferably grown on a silica, i. a silicic acid is preferably modified with the silane prepared according to formula IV).
• silica VN3, Evonik
• silica VN3, Evonik
• 4.62 g of the silane according to formula IV 31.2 g of silica (VN3, Evonik) and 4.62 g of the silane according to formula IV) are used.
• the resulting suspension is stirred for 6 to 18 hours at 120 ° C and then the solvent is removed under reduced pressure. After one day drying in a high vacuum at 40 ° C., the modified silica thus obtained is comminuted. It is then dried for a further day at 40 ° C under high vacuum.
• the preparation of the silane V), that is the ortho-linked silane with respect to the disulfidic group, is carried out in principle analogously to the preparation of the silane IV). In the following, therefore, only the differences will be described.
• the target compound After drying under high vacuum, the target compound could be isolated as a white powder (2.70 g, 2.75 mmol, 29%).
• the silane of formula V) prepared is preferably grown on a silica, i.
• a silicic acid is modified with the silane prepared according to formula V).
• silanes according to the invention are marked with E.
• the mixtures VI and El as well as V2 and E2 as well as V3 and E3 and E4 contain in each case molar amounts of the silane from the prior art (VI, V2, V3) or of the inventive silane IV) (E1, E2, E3) or of the inventive silane V) (E4).
• the silanes are each supported on the silica (95 phr in each mixture), so that the respective silane-modified silica was mixed.
• the quantities thus refer to the products of the modification reactions, wherein in each mixture 95 phr of silica were used.
• the residual amount (difference: table value minus 95 phr) thus represents the silane-bound silane.
• Test specimens were prepared from all blends by vulcanization after tgs (measured on the Moving Disc Rheometer according to ASTM D 5289-12 / ISO 6502) under pressure at 160 ° C. and with these test specimens typical for the rubber industry
• anti-aging agents e) anti-aging agents, ozone protection wax, zinc oxide, stearic acid
• the rubber mixtures El to E4 are at a higher level of rigidity and have a higher hardness.
• Exemplary embodiments ie the mixtures with the silanes prepared according to the invention, thus show in particular improved handling indicators.
• the examples according to the invention E1 to E3 comprising the silane according to formula IV) also have improved wet-braking indicators with the (compared to VI to V3) lower rebound resilience.

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• 2017
  • 2017-06-30 DE DE102017211110.0A patent/DE102017211110A1/de not_active Withdrawn
• 2018
  • 2018-05-14 US US16/622,970 patent/US11396601B2/en active Active
  • 2018-05-14 WO PCT/EP2018/062293 patent/WO2019001823A1/de not_active Ceased
  • 2018-05-14 CN CN201880042914.0A patent/CN110799582B/zh active Active
  • 2018-05-14 ES ES18724529T patent/ES2895358T3/es active Active
  • 2018-05-14 JP JP2019564914A patent/JP6994051B2/ja active Active
  • 2018-05-14 EP EP18724529.5A patent/EP3645615B1/de active Active

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