EP1423458A1 - Compositions elastomeriques a base de latex charge - Google Patents
Compositions elastomeriques a base de latex chargeInfo
- Publication number
- EP1423458A1 EP1423458A1 EP02764754A EP02764754A EP1423458A1 EP 1423458 A1 EP1423458 A1 EP 1423458A1 EP 02764754 A EP02764754 A EP 02764754A EP 02764754 A EP02764754 A EP 02764754A EP 1423458 A1 EP1423458 A1 EP 1423458A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- latex
- dispersion
- filler
- pct
- implementing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
- C08K3/02—Elements
- C08K3/04—Carbon
-
- 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
-
- 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 present invention relates to elastomeric compositions obtained by depositing and drying an aqueous dispersion containing at least latex, a filler and the usual vulcanization ingredients, and by vulcanization under pressure.
- Patent application FR 2 588 008 proposes, in order to obtain a filler-polymer composition from the latex, to impregnate the filler with at least one latex emulsion, so as to cause coagulation, at least partially, of the latex polymer by dehydration thereof.
- the percentage of dry polymer relative to the filler varies between 25 and 100%.
- Silane can be added in the form of an aqueous emulsion. The masterbatches thus produced have a better ability to disperse the charge.
- the objective of the invention is to be able to reconcile the advantage of a preparation process which consumes little energy, suitable for the preparation of filler-polymer compositions based on latex, and the obtaining of sufficient mechanical properties, suitable for compositions as usually prepared in the tire industry.
- the invention provides a process for obtaining a vulcanized elastomeric composition, consisting in preparing an aqueous dispersion containing at least latex with small particle size and a filler having undergone a preparation step by mechanical work and the usual vulcanization ingredients. , drying this dispersion and then vulcanizing in a pressure mold, without subjecting said dried aqueous dispersion, containing at least latex and said filler, to mechanical work, the aim of which would be to improve the mechanical properties of the vulcanized composition.
- the vulcanization is carried out by cooking under pressure, after placing the said composition in a suitable mold as a function of the final product to be produced.
- the vulcanization pressure is greater than 15 bars, and preferably greater than 50 bars.
- the filler and the latex must be finely mixed.
- the final mixture contains at least 35 phr of filler, and must not have, after drying, a viscosity at 100 ° C greater than 1.2 10 6 Pa s.
- P10-1379-PCT with a mixture formulated at the same charge rate and vulcanizing agents conventionally produced in the internal mixer.
- the mechanical work of the fillers can be carried out either on the powder or pelletized load using a ball mill for example, or on the powder or pelletized load in the presence of part of the latex using '' a ball mill for example, either on the aqueous dispersion of the filler in the presence of part of the latex using a ball mill for example, or on the aqueous dispersion of the filler by passing it under high pressure in small orifices, using a homogenizing device for example.
- latexes directly obtained from emulsion synthesis, namely: SBR latex, carboxylated SBR latex, nitrile latex, carboxylated nitrile latex, polychloroprene latex, acrylic latex, vinylpyridine latex. It can also be artificial latex obtained by emulsification of organic solution of polymers, such as polyisoprene, polybutadiene, butyl (Isobutylene Isoprene Rubber), butyl halogen, EPDM.
- the charges used belong to the category of reinforcing charges. They have the usual fineness, it is indifferently carbon black or white fillers such as silica, alumina, etc.
- FIG. 1 shows stress-strain curves of a reference composition and of a composition according to the invention.
- Particle size measurements of the latexes used were carried out by Photon Correlation Spectroscopy (Photon Correlation Spectroscopy, PCS) with a Zetasizer 5000 device (Malvera Instruments Ltd) working in the 5-3000 nm range.
- P10-1379-PCT The values expressed above have been analyzed in volume, the calculation of the particle sizes is based on the refractive index of styrene.
- the values obtained for the LX110 and the LX112 are slightly higher than those announced by the manufacturer Nippon Zeon and measured by an unspecified technique: 50nm for the LX110 and 80 nm for the LX112.
- dispersions of active products such as ZnO, CBS and sulfur are prepared separately by grinding in a ball jar.
- the grinding times vary according to the products; they can range from 24 to 48 hours, as well known per se.
- a dispersion of the filler (carbon black or silica) to around 25% of dry matter is also carried out in a ball jar in the presence of the appropriate surfactants, mainly Tamol.
- silica a VN3 silica from Degussa, already modified with 11% of binding agent SI69, is used.
- carbon black we chose N375.
- the viscosity is determined with a Viscoelasticity Analyzer of Rubbers (Rubber Process Analyzer - RPA2000 from Alpha Technologies) at 100 ° C for a deformation of 14% and a frequency of 0.07 Hz.
- the vulcanization of the raw sample is measured with the same device under the following conditions: a temperature of 165 ° C, a deformation of 4.2% and
- P10-1379-PCT a frequency of 1.67 Hz.
- the shear modulus G 'at 0.7% deformation is measured in the forward cycle with this RPA2000 at a temperature of 40 ° C and a frequency of 1.67 Hz.
- the tangent delta value is taken under these same conditions at 40% deformation on the return cycle.
- the 10, 100 and 300% secant modules are determined in the second traction cycle with an Instron 4466 traction device with a traction speed of 500 mm / min.
- the MA300 / MA100 ratio is considered, with the breaking force, as a reinforcement index.
- the Remanence in% corresponds to the elongation for which the traction force becomes zero when the second traction cycle returns to 300% when the secant modulus is measured at 300%.
- the specimen used is of a constant width of 5 mm, of a thickness of approximately 3 mm and of a length between clamps of 90 mm.
- the breaking properties are measured with the same tensile device at a speed of 500 mm / min.
- the test piece is similar to the Hl dumbbell test piece described in standard NF T 46-002 with a total length of 127 mm, a width of the heads of 23 mm, a length of the straight part of 25 mm, a width of the straight part of 3.2 mm, a small radius of 24 mm and a large radius of 25 mm.
- the thickness is approximately 3 mm and the initial length between clamps is 80 mm.
- the rupture deformation between clamp in% is calculated from the displacement of the cross member of the traction machine and is therefore based on the initial length between clamps of 80 mm.
- the first technique to give mechanical work to the load consists of the use of a homogenizing device (Microfluidizer M-110Y from Microfluidics Corporation). This makes it possible to pass charge dispersions or the final dispersion before spraying at very high speed under high pressure into small diameter chambers.
- the chambers can have different geometries: Z or Y chambers of constant section with diameters of 75, 100 and 200 microns, convergent of 65 microns with an angle of 8 °.
- a second technique consists in effecting an efficient dry grinding of the load in a ball jar.
- 300 grams of 9 mm diameter unglazed porcelain beads, 600 grams of 15 mm diameter beads, 600 grams of 20 mm diameter beads and 150 grams of black are introduced. carbon or silica.
- the jar is rotated at a speed of about 40 revolutions / minute for a period ranging from 4 to 24 hours. Water and the necessary surfactants are then introduced and the mixture is re-rotated for approximately 16 hours to obtain the aqueous charge dispersion.
- premixing A third technique, which will be referred to in the following as premixing, is twofold: a distinction is made between the premixing technique without adding water and the premixing technique with adding water.
- the pre-mixing technique without adding water is as follows: into a jar filled with beads as described above, the filler and part of the latex of the formulation are introduced at a rate of 50% by dry weight relative to the weight dump. Grinding is carried out for three days. There is no addition of surfactants at this stage. Each day, the interior surface of the jar is scraped. Then, the aqueous surfactant solution is introduced and the stirring is resumed overnight. This latex-modified charge dispersion is then used in the same manner as described above.
- This pre-mixing technique (KML 243 / D, 238 / A, 235 / 2C) also makes it possible to lower the viscosity of the sprayed mixture, to reduce the modules with low deformation, to improve the MA300 / MA100 ratio as well as the breaking forces. The effect, however, is all the more pronounced as the prior dry grinding has been long.
- the mixture obtained using the standard manufacturing method described in Example 1 (KML 176 A) is also characterized by high low deformation rigidities and an average breaking force of 18 MPa. Dry grinding the silica for four hours beforehand makes it possible to lower the raw viscosity, to minimize the modules with low deformation and to significantly improve the breaking strength (KML215C).
- the premixing techniques with or without adding water are also applicable in the case of silica used as a filler.
- the pre-mixing technique with the addition of water consists, after any dry grinding of variable duration, in introducing the aqueous surfactant solution into the jar and stirring for 6 to 12 hours. Then, part of the latex of the formulation is introduced in an amount of 50% by dry weight relative to the filler weight and
- a formulation was made with LXl 12 latex, 40 pce of coupil and 15 pce of oil (KML 464). It is possible to introduce aromatic oil into these dispersions by producing an aqueous oil dispersion at 40% concentration using surfactants such as sodium dodecylsulfonate and sodium dodecylsulfate. Due to the addition of oil, the raw viscosity and the low deformation modules are normally reduced compared to the results of Example 3. The replacement of latex LXl 12 by latex LXl 10 gives very interesting results (KML465 ). There is a very significant reduction in remanence and tangent delta, hysteretic loss factor and indicator of heating of the mixture during its use.
- a mixture based on SBR1500, an SBR emulsion similar to the constituent polymer of the latex LXl 12, and of silica coupil at 40 phr (T10179) was produced in the internal mixer in two stages.
- the results give an MA10 of 4.2 MPa, a tangent delta of 0.13, a MA300 / MA100 ratio of 1.2, a remanence of 25%, a breaking force of approximately 21 MPa for an actual elongation measured by extensometer of approximately 450%.
- the abrasion resistance of this material was measured using a Bareiss abnfe05000 abrasimeter according to DIN53416; the rotating sample technique was used and a force of 20N of the test body was applied for a friction length of 40 m.
- the indicated abrasion result was normal to 100.
- the three examples show that it is possible to introduce an antioxidant such as 6PPD, a static anti-zone agent such as an ozone wax, stearic acid as a vulcanization activator, DPG as a secondary accelerator and CTP as a vulcanization retardant. They also show that it is possible to reduce the amount of dispersing agent required. In the third mixture, only 0.57 phr of surfactant remains in the dry formula.
- the oil is introduced in the form of an emulsion at 40% concentration.
- the oil is introduced into the ground silica with additional grinding for a few hours to disperse the oil on the charge.
- a technique perfectly suited to obtaining the mixtures described by the invention consists in spraying the final dispersion in hot air.
- a cone equipped with a filter is generally used to promote the recovery of the product.
- the final dispersion can also be sprayed directly onto a form or into a mold using sufficiently hot spray air to dry the product to a large extent before it settles on the form.
- P10-1379-PCT the shape of the interior cavity of the tire is particularly well suited to the production of tires.
- the prior mechanical work undergone by the filler can be carried out by grinding together for a certain time the filler and a proportion of the latex of the formulation, then introducing the aqueous solution of surfactants and mixing in order to obtain a dispersion. of the load!
- the latex then introduced into the final dispersion may be of the same nature, or of a different nature.
- the prior mechanical work undergone by the filler can be carried out by dispersing the filler in an aqueous solution of surfactants, by introducing a proportion of latex of the formulation, and then mixing for a certain time in order to obtain a homogeneous dispersion of the charge.
- the latex then introduced into the final dispersion may be of the same nature, or of a different nature.
- RRL Resorcinol-Formol-Latex glue
- textile reinforcements such as, for example, rayon, nylon, polyester, aramid or fiberglass.
- the aqueous dispersion is particularly well suited for the techniques of depositing these adhesives by impregnation baths.
- P10-1379-PCT Use in place of dissolving mixtures to improve the sticky raw when assembling the different products of a rubber article during manufacturing.
- the final dispersion is deposited in a thin layer, for example by spraying or with a brush.
- Direct production of a tread by spraying an ad hoc composition onto a rotating tire carcass.
- variants of preparation by premixing with or without the addition of water make it possible to produce combinations of polymers for which the nature of the polymer is preferably chosen in contact with the filler. They also make it possible to produce, during the manufacture of the final dispersion, associations of charges of different nature for which one can choose the nature of the polymer preferentially in contact with each of them.
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0110479A FR2828201A1 (fr) | 2001-08-03 | 2001-08-03 | Procede d'obtention de compositions elastomeriques par depot et sechage d'une dispersion aqueuse contenant au moins du latex, une charge et les ingredients usuels de vulcanisation |
| FR0110479 | 2001-08-03 | ||
| PCT/EP2002/008188 WO2003014208A1 (fr) | 2001-08-03 | 2002-07-23 | Compositions elastomeriques a base de latex charge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1423458A1 true EP1423458A1 (fr) | 2004-06-02 |
Family
ID=8866299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02764754A Withdrawn EP1423458A1 (fr) | 2001-08-03 | 2002-07-23 | Compositions elastomeriques a base de latex charge |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7399805B2 (fr) |
| EP (1) | EP1423458A1 (fr) |
| FR (1) | FR2828201A1 (fr) |
| WO (1) | WO2003014208A1 (fr) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140196847A1 (en) * | 2013-01-15 | 2014-07-17 | Rainforest Technologies, Llc | Conductive aqueous-based adhesive compositions and methods of use thereof |
| JP6779033B2 (ja) * | 2016-05-12 | 2020-11-04 | 倉敷化工株式会社 | ゴム組成物 |
| US11247424B1 (en) | 2016-12-13 | 2022-02-15 | Bridgestone Americas Tire Operations, Llc | Methods for retreading tires |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB306621A (en) * | 1927-12-01 | 1929-02-28 | Dunlop Rubber Co | Improvements in the production of goods made from aqueous dispersions of rubber and similar materials |
| DE2030172C3 (de) * | 1970-06-19 | 1979-09-13 | Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt | Verfahren zur Herstellung von Mischungen aus natürlichem oder synthetischem Kautschuk und gefällter Kieselsäure |
| US5182322A (en) * | 1990-12-05 | 1993-01-26 | E. I. Du Pont De Nemours And Company | Chlorinated ethylene copolymer latex |
| GB9520700D0 (en) * | 1995-10-10 | 1995-12-13 | Lrc Products | Rubber latex films having improved tear resitance |
| US6365663B2 (en) * | 1996-04-01 | 2002-04-02 | Cabot Corporation | Elastomer composite blends and methods-II |
| US6075084A (en) * | 1996-04-01 | 2000-06-13 | Cabot Corporation | Elastomer composite blends and methods - II |
| TW360585B (en) * | 1996-04-01 | 1999-06-11 | Cabot Corp | Elastomeric compositions and methods and apparatus for producing same |
| PT810082E (pt) * | 1996-05-28 | 2003-04-30 | Semperit Reifen Ges M B H | Processo e dispositivo para a vulcanizacao de pneumaticos |
-
2001
- 2001-08-03 FR FR0110479A patent/FR2828201A1/fr active Pending
-
2002
- 2002-07-23 EP EP02764754A patent/EP1423458A1/fr not_active Withdrawn
- 2002-07-23 WO PCT/EP2002/008188 patent/WO2003014208A1/fr not_active Ceased
-
2004
- 2004-02-02 US US10/770,968 patent/US7399805B2/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| None * |
| See also references of WO03014208A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2828201A1 (fr) | 2003-02-07 |
| US20040192839A1 (en) | 2004-09-30 |
| US7399805B2 (en) | 2008-07-15 |
| WO2003014208A1 (fr) | 2003-02-20 |
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| AX | Request for extension of the european patent |
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| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: TORNARE, MARCEL Inventor name: MOUSTY, HERVE |
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| 17Q | First examination report despatched |
Effective date: 20041025 |
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| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: MICHELIN RECHERCHE ET TECHNIQUE S.A. |
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