WO2018156036A1 - Composition d'étanchéité pour pneumatiques - Google Patents
Composition d'étanchéité pour pneumatiques Download PDFInfo
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- WO2018156036A1 WO2018156036A1 PCT/PL2017/000014 PL2017000014W WO2018156036A1 WO 2018156036 A1 WO2018156036 A1 WO 2018156036A1 PL 2017000014 W PL2017000014 W PL 2017000014W WO 2018156036 A1 WO2018156036 A1 WO 2018156036A1
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- Prior art keywords
- sealing composition
- sealing
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- composition according
- mixture
- Prior art date
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 107
- 238000007789 sealing Methods 0.000 title claims abstract description 70
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims abstract description 42
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 38
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000009826 distribution Methods 0.000 claims abstract description 13
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims abstract description 12
- 150000001875 compounds Chemical class 0.000 claims abstract description 12
- YIWUKEYIRIRTPP-UHFFFAOYSA-N 2-ethylhexan-1-ol Chemical compound CCCCC(CC)CO YIWUKEYIRIRTPP-UHFFFAOYSA-N 0.000 claims abstract description 11
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 claims abstract description 9
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000012764 mineral filler Substances 0.000 claims abstract description 5
- 150000005846 sugar alcohols Polymers 0.000 claims abstract description 4
- 229920001400 block copolymer Polymers 0.000 claims abstract description 3
- 239000004094 surface-active agent Substances 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 9
- 239000000440 bentonite Substances 0.000 claims description 3
- 229910000278 bentonite Inorganic materials 0.000 claims description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 3
- 239000005337 ground glass Substances 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 description 25
- 239000004615 ingredient Substances 0.000 description 20
- 239000000806 elastomer Substances 0.000 description 19
- 239000010410 layer Substances 0.000 description 18
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- 229920000126 latex Polymers 0.000 description 17
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- 239000000839 emulsion Substances 0.000 description 10
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- 239000000565 sealant Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 239000007787 solid Substances 0.000 description 8
- 239000000725 suspension Substances 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 6
- 238000005345 coagulation Methods 0.000 description 6
- 230000015271 coagulation Effects 0.000 description 6
- 239000005060 rubber Substances 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 5
- 229920003052 natural elastomer Polymers 0.000 description 5
- 229920001194 natural rubber Polymers 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
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- 238000012360 testing method Methods 0.000 description 5
- 244000043261 Hevea brasiliensis Species 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229920001083 polybutene Polymers 0.000 description 4
- 239000005062 Polybutadiene Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 230000002209 hydrophobic effect Effects 0.000 description 3
- 229920002521 macromolecule Polymers 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 229920002857 polybutadiene Polymers 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000005061 synthetic rubber Substances 0.000 description 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 239000013032 Hydrocarbon resin Substances 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229920003211 cis-1,4-polyisoprene Polymers 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 150000002191 fatty alcohols Chemical class 0.000 description 2
- 235000013312 flour Nutrition 0.000 description 2
- 239000003349 gelling agent Substances 0.000 description 2
- 229920006270 hydrocarbon resin Polymers 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 150000003904 phospholipids Chemical class 0.000 description 2
- -1 polyethylenes Polymers 0.000 description 2
- 229920001195 polyisoprene Polymers 0.000 description 2
- 229920001451 polypropylene glycol Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 229910052895 riebeckite Inorganic materials 0.000 description 2
- 239000012812 sealant material Substances 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 235000015112 vegetable and seed oil Nutrition 0.000 description 2
- 239000008158 vegetable oil Substances 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N vinyl-ethylene Natural products C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- QIVUCLWGARAQIO-OLIXTKCUSA-N (3s)-n-[(3s,5s,6r)-6-methyl-2-oxo-1-(2,2,2-trifluoroethyl)-5-(2,3,6-trifluorophenyl)piperidin-3-yl]-2-oxospiro[1h-pyrrolo[2,3-b]pyridine-3,6'-5,7-dihydrocyclopenta[b]pyridine]-3'-carboxamide Chemical compound C1([C@H]2[C@H](N(C(=O)[C@@H](NC(=O)C=3C=C4C[C@]5(CC4=NC=3)C3=CC=CN=C3NC5=O)C2)CC(F)(F)F)C)=C(F)C=CC(F)=C1F QIVUCLWGARAQIO-OLIXTKCUSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- GUUVPOWQJOLRAS-UHFFFAOYSA-N Diphenyl disulfide Chemical group C=1C=CC=CC=1SSC1=CC=CC=C1 GUUVPOWQJOLRAS-UHFFFAOYSA-N 0.000 description 1
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 229920006465 Styrenic thermoplastic elastomer Polymers 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 229920000469 amphiphilic block copolymer Polymers 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 230000003254 anti-foaming effect Effects 0.000 description 1
- 239000003146 anticoagulant agent Substances 0.000 description 1
- 229940127090 anticoagulant agent Drugs 0.000 description 1
- 239000007798 antifreeze agent Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229920003244 diene elastomer Polymers 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012765 fibrous filler Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000013538 functional additive Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 230000005661 hydrophobic surface Effects 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 235000013379 molasses Nutrition 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000012454 non-polar solvent Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 235000019198 oils Nutrition 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 125000005702 oxyalkylene group Chemical group 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002798 polar solvent Substances 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000005077 polysulfide Substances 0.000 description 1
- 229920001021 polysulfide Polymers 0.000 description 1
- 150000008117 polysulfides Polymers 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000012763 reinforcing filler Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000007785 strong electrolyte Substances 0.000 description 1
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 description 1
- 229960002447 thiram Drugs 0.000 description 1
- 239000004034 viscosity adjusting agent Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
- B29C73/16—Auto-repairing or self-sealing arrangements or agents
-
- 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
- C08K5/04—Oxygen-containing compounds
Definitions
- the invention relates to a sealing composition for automobile tires, in particular to be applied to the interior surface of a tire by a compressor without the need to remove the pneumatic valve.
- the primary categories of ingredients of known tire sealing compositions comprise anti-freezing agents including mainly ethylene glycol, propylene glycol or other polyhydric alcohols such as glycerol, polyoxyalkylene glycol, or calcium chloride, fillers such as silica, bentonite, aluminum hydroxide, viscosity modifiers, dispersing agents, surfactants, preservatives , corrosion inhibitors, vegetable oils, crosslinking catalysts, latex, fibers from a group comprising cellulose, glass, carbon and asbestos fibers and many other functional ingredients.
- anti-freezing agents including mainly ethylene glycol, propylene glycol or other polyhydric alcohols such as glycerol, polyoxyalkylene glycol, or calcium chloride, fillers such as silica, bentonite, aluminum hydroxide, viscosity modifiers, dispersing agents, surfactants, preservatives , corrosion inhibitors, vegetable oils, crosslinking catalysts, latex, fibers from a group comprising cellulose, glass
- a number of ingredients of known sealing compositions for automobile tires is harmful to health or environment. These include for instance ethylene glycol or carcinogenic asbestos fibers known from applications US4713114A and US4337322A. However safer natural substitutes such as flour and vegetable oils known from US patent application US5059636A, or molasses known from application US7807732A or glycerol known from international patent application PCT/CN2011/080946, or synthetic propylene glycol disclosed in patent application US5364463A have been successfully used in sealing preparations for automobile tires.
- a frequent functional additive to sealing compositions for tires includes also anti-foaming substances, for instance silicone emulsions disclosed in application US5059636 A.
- a group of high-performance sealants with valuable performance properties includes liquid sealing compositions based on synthetic or natural latex.
- compositions for application to the interior surface of the tread of a pneumatic tire to facilitate relative movement between contacting portions of the interior surface when the tire is driven deflated comprise a polybutene, an acrylic polymer or a polyolefin as a gelling agent for the polybutene, and a particulate solid puncture sealing material.
- Preferred gelling agents are polyethylenes, especially a mixture of high density and low density polyethylenes.
- suitable puncture sealing materials are rubber crumb and wood flour.
- Chinese patent application CN103555122 (A) relates to a macromolecuiar self-mending self-sealing hot melting polymeric glue for automobile tires and a preparation method thereof.
- the self-sealing polymeric glue comprises the following main components in percentage by weight: 30-38% of styrenic thermoplastic elastomer, 40-45% of thermoplastic polymer resin with the relative molecular weight of 200-2000, 5-15% of plasticized softening component, 1-2% of anti-aging antioxidant component, 0-2% of catalyzing promoting component and 0- 8% of filling temperature-resistant component.
- the macromolecular self- mending self-sealing hot melting polymeric glue provided by the invention is sprayed on the surface of the inner wall of an automobile tire, a uniform coating with the thickness not less than 3.5mm is formed so as to play roles in leak prevention, puncture prevention and bullet prevention, so that the glue can be used for military vehicles.
- WO2016115560 there is known a high performance sealant for repairing punctures in tires which includes a highly filtered natural rubber Iatex, an ultra-fine inorganic powder, a polyamide suspension, and an antifreeze agent that includes water and at least one of ethylene glycol and propylene glycol.
- the high performance sealant can readily pass through a valve stem of a tire without removing the core and seal, and provides a strong and durable sealing of the puncture.
- Indian patent application IN6310DEN2012 (A) relates to an elastomeric composition having a self-sealing property, which is usable, in particular, as an anti- puncture layer in a tire object, and containing at least (a significant percentage of parts by weight percent of a solid elastomer): an unsaturated solid diene elastomer; between 30 and 90 percent of a hydrocarbon resin; 0 to less than 30 percent of a filler; between 0.5 and 15 percent of thiuram polysulfide.
- elastomer composition having a self-sealing property which can be used in particular as puncture-resistant layer in an inflatable article, based on at least (phr meaning parts by weight per 100 parts of solid elastomer): a blend of at least two solid elastomers, a polybutadiene or butadiene copolymer elastomer, referred to as "elastomer A”, and a natural rubber or synthetic polyisoprene elastomer, referred to as "elastomer B”, the elastomer A: elastomer B ratio by weight being within a range from 10: 90 to 90 : 10 between 30 and 90 phr of a hydrocarbon resin; from 0 to less than 30 phr of filler.
- Chinese patent application TW201525114 discloses a sealant composition; the sealant composition comprises latex emulsion, nanoporous particles, surfactant, anti-freezing agent, wetting agent, and water.
- the sealant composition of the present application achieves a good sealing performance for the puncture of the tire.
- Japanese patent application J P 2014214313 (A) there is known a color sealant composition with self-sealing performance useful for a tire which includes 10 to 60 pts.wt. of surface modified silica, 0.05 to 5 pts. wt. of pigment, 40 to 100 pts.wt. of polybutene having a number average molecular weight of 1000 to 1500, 60 to 300 pts.wt. of polybutene having a number average molecular weight of 2000 to 3000, and 5 to 15 pts.wt. of peroxide, to 100 pts. wt. of raw rubber.
- US2014138004 (Al) an elastomer composition having a self-sealing property which includes a blend of at least two solid elastomers, in which "elastomer A” is a polybutadiene or butadiene copolymer eiastomer, in which "eiastomer B is a natural rubber or synthetic polyisoprene eiastomer, and in which an elastomer A: elastomer B weight ratio is within a range from 10: 90 to 90 : 10 with phr meaning parts by weight per 100 parts of solid eiastomer; and from 0 to less than 120 phr of filler, which includes from 0 to less than 30 phr of reinforcing filler.
- the composition may be used to form a puncture-resistant layer in an inflatable article, such as a tire.
- the puncture-resistant layer may be used in combination with an air
- the known latex sealing composition includes a surfactant, propylene glycol and natural rubber, synthetic rubber or a mixture of natural and synthetic rubber.
- the composition is temperature-resistant down to (-) 35 °C and may be used for instance as a sealant for tires.
- the invention also describes the method of preparing the composition according to the invention. The method comprises the addition of propylene glycol to the surfactant to produce a mixture with propylene glycol and combining polypropylene glycol mixture with a rubber emulsion.
- a fibrous or a non-fibrous filler, as well as a binder and antioxidant may be added to the polypropylene glycol mixture, before it is mixed with rubber.
- the excessive coagulability of latex reduces the stability of the sealing composition over time, stiil the maintenance of limited latex coagulability on walls with high surface energy and electrical charge, as is the case for porous surfaces of damaged rubber tires, is desired.
- the coagulability of latex which is a component of a high-performance sealing composition, is thus the object of optimization.
- the sealing composition according to the invention was developed based on the analysis of the phenomenon of latex flocculation and coagulation based on the theory of stability of lyophobic dispersions by Derjaguin, Landau, Vervey, and Overbeek (DLVO), taking into account the structure of latex micelle particle comprising a tangled chain of cis 1,4-polyisoprene surrounded with a spherical layer of phospholipid particles with their hydrophobic part turned to the polyisoprene macromolecule.
- DLVO Derjaguin, Landau, Vervey, and Overbeek
- the macromolecule is an appropriate polymer of synthetic rubber (e.g. polybutadiene, polychloroprene etc.), stabilized with a synthetic surfactant.
- synthetic rubber e.g. polybutadiene, polychloroprene etc.
- the increase of the potential repulsion energy of micelles may be obtained by increasing the thickness of the electrical double layer and zeta potential with the ionic strength of the solution phase kept low (lack of strong electrolytes).
- the essence of the sealing composition according to the invention is based on the use of amphiphilic copolymer of ethylene oxide, propylene oxide and 2- ethylhexan-l-ol as a surfactant, and its interaction with other ingredients of the said composition which facilitates maximum reduction of the number of ingredients of the sealing composition and at the same time ensures favorable environmental performance and high sealing performance even in extreme temperatures.
- molecules of this compound demonstrate steric specificity which creates a dimensionally-oriented structure on the interfacial surface of suspended particles of latex emulsion, solid particles and the liquid phase of the sealing composition ingredients and on the inner surface of a tire and its space filled with air, and also on the surface of the puncture thus facilitating the penetration of other components of the sealing composition thus increasing its effectiveness, including the effectiveness of sealing the hole where the tire is punctured.
- Sterically specific amphiphilic structure of the amphiphilic copolymer used also has impact on keeping the suspension homogenous without its quick breaking, preventing coagulation and cross-linking of ingredients of the sealing composition during its storage.
- the sterically specific amphiphilic compound, included in the sealing composition according to the invention and acting as a surfactant, constitutes polydispersion mixtures of block copolymers obtained as a result of oxypropylating of 2-ethylhexan-l-ol and the subsequent polyoxyethylenating with 8 to 12 moles of oxirane leading to the production of a mixture of products with polyether properties with the general formula (I): where and j are natural numbers between 0 -20.
- Analytical research conducted by the authors of this study shows that the product of the reaction in question may also contain up to 30% by weight of diols of general formula (II),
- a, b and c are natural numbers from 0-30 which also demonstrate partial amphiphilic properties.
- the described structure of molecules and the ingredients of the mixture of products makes it impossible to define their hydrophilic and lipophilic balance and explains specific characteristics and properties different from other amphiphilic compounds known from prior art.
- the said properties include for instance the lack of gelling, irrespective of concentration in aqueous solutions, and a significantly higher minimum surface of particles adsorbed at the phase boundary. This indicates a different self-organization of the discussed structures in solvent solutions.
- the sealing composition for automobile tires according to the invention contains a surfactant, at least one polyhydric alcohol from a group comprising glycerol, ethylene glycol, propylene glycol, natural latex, water and possibly mineral fillers, yet it contains amphiphilic block copolymer which is a po!ydispersion mixture of compounds of general formula (I) and (II), in the amount of 1-5% by weight where compounds of type ⁇ 1 ⁇ are a polydisperston mixture with the content of individual homologues defined by Poisson distribution or other distribution similar to Poisson distribution, with average content of mer units of propylene oxide per 1 mole of 2-ethylhexan-l-ol and variances falling in the range from 1-3, and the average content of mer units of ethylene oxide per 1 mole of 2-ethylhexan-l-ol and variances falling in the range from 8-13.
- a surfactant at least one polyhydric alcohol from a group comprising glycerol, ethylene glycol, prop
- the amphophilic copolymer included in the sealing composition is a polydispersion mixture which contains homologues with a different number of oxyalkylene groups, the amount similar to the content defined by Poisson distribution, the expected value and variance v ⁇ 3): where: x clay - mole fraction of an oligomer molecule containing n monomers xo - initial mole fraction of a starter in a reaction mixture v - average degree of oxyethylenating (expected value and variance of distribution) n - number of mers of oxirane in a molecule e - a basis of a natural algorithm in the preferred embodiment, the sealing composition according to the invention may include at least one mineral filler selected from a group comprising bentonite and ground glass.
- the sealing composition according to the invention is a mobile liquid in temperature range from -30 to +70°C.
- the sealing composition according to the invention is applied to the interior surface of an automobile tire by a compressor without the need to remove the valve.
- Fig. 1 shows a schematic structure of !atex micelle, sectional view
- Fig. 2 presents a family of Poisson distribution curves for concentrations of individual oligomers with six different average degrees of oxyalkilenating
- Fig. 3 a) is a schematic structure of a monolayer of a surface film of a known conventional linear surfactant; b) is a schematic structure of a monolayer of a surface film with a sterically specific amphophilic copolymer.
- the micelle with rubber latex shown in fig. 1, is composed of a tangled chain of cis 1,4-polyisoprene surrounded with a spherical layer of phospholipid molecules with their hydrophobic surface turned to the polyisoprene macromolecule; the broken lines indicate an electrical double layer of a latex micelle.
- the key function of the amphiphilic copolymer used involving the exceptionally effective and quick action of the sealing composition according to the invention also involves a proper foaming of the sealing composition when applied which facilitates even dispersion of ingredients of the composition according to the invention on the interior surface of a tire while using a minimum amount thereof.
- the exceptionally low stability of the foam produced results in immediate wetting and maximum contact of the sealing agent with the surface it is supposed to act on.
- the applied sterically specific amphiphilic copolymer also plays a crucial role in the removal of remains of the sealing composition from the interior surface of a tire in the case of its repair/vulcanization and further use.
- Attempts to use linear surfactants known from prior art as a substitute such as oxyethylated fatty alcohols have failed or the results were moderate in a limited scope of functions played as compared to the sterically specific amphiphilic copolymer used in the sealing composition according to the invention.
- the negative results obtained involved latex coagulation and a lack of possibility to dose the emulsion to a tire or its excessive stability which did not have the sealing effect.
- the sealing composition according to the invention is not classified as a dangerous chemical product in the meaning of principles of Regulation no. 1272/2008 of the European Parliament and of the Council (EC), and is chemically neutral which means that is does not for example cause corrosion of an automobile tire or plastic packaging.
- the composition according to the invention remains liquid enough to facilitate its automatic application in the temperature range from -30°C to +70°C.
- the composition according to the invention shows high sealing performance.
- the effectiveness of the composition according to the invention was measured using a method based on sealing a puncture made in an inflated tire by means of a standard steel spike with diameter of up to 6 mm causing a drop of overpressure from 2.5 bar to 0.9 bar/min. due to decompression.
- the puncture is sealed within up to 10 minutes and remains effective for at least 24 hours and a distance of up to 2000 km and driving speed of up to SO km/h.
- a mixture of 17% by weight of glycerol, 9% by weight of ethylene glycol, 20% by weight of propylene glycol, 26% by weight of natural latex being a 60% ⁇ by weight) water emulsion, 25% by weight of water was prepared, and then while mixing carefully 3% of the reactive mixture obtained by oxypropylating of 1 mol of 2- ethy[hexan-l-ol with 1 mol of propylene oxide was added and then the product obtained was subject to oxyethylenating with 9 moles of oxirane in the presence of zinc hexacyanocobaltate as a dimethyl cyanide catalyst.
- the sealing composition according to the invention being a stable suspension of ingredients, was obtained.
- the obtained sealing composition remained a mobile liquid in the temperature range from -30°C to +70°C. Slight breaking occurred during storage at +S0°C but the composition was easily blended by shaking.
- the sealing composition according to the invention being a stable suspension of ingredients, was obtained and applied in the amount of 450 ml to an automobile tire size 255/55 R1S by a compressor without the need to remove the AV valve, the process took 80 seconds.
- the obtained sealing composition remained a mobile liquid in the temperature range from -30°C to +70°C. Slight breaking occurred during storage at 80°C but the composition was easily blended by shaking.
- a mixture containing 17% by weight of glycerol, 9 % by weight of ethylene glycol, 20 % by weight of propylene glycol, 26 % by weight of natural latex being a 60% (by weight) water emulsion, 25% by weight of water was made, and then while mixing carefully 1% by weight of the product obtained by oxypropylating of 1 mole of 2- ethylhexan-l-ol with 1 mole of propylene oxide was added and then the product obtained was subject to oxyethylenating with 13 moles of oxirane in the presence of calcium catalyst.
- the sealing composition according to the invention being a stable suspension of ingredients, was obtained and applied in the amount of 450 ml to an automobile tire size 255/55 R18, by a compressor without the need to remove the AV valve, the process took 80 seconds.
- the obtained sealing composition remained a mobile liquid in the temperature range from -30°C to +70°C. Slight breaking occurred during storage at 80°C but the composition was easily blended by shaking.
- the puncture was sealed within up to 10 minutes and was effective for at least 24 hours for a distance of up to 2000km and driving speed of up to 80 km/h.
- a stable suspension of ingredients was obtained and applied in the amount of 450 ml to an automobile tire size 255/55 R18, by a compressor without the need to remove the AV valve, the process took 80 seconds.
- the obtained sealing composition remained a mobile liquid in the temperature range from -30°C to +70°C. Slight breaking occurred during storage at 80°C but the composition was easily blended by shaking. During road tests, the puncture in the tire made with a standard steel spike with a diameter of 6mm was not effectively sealed.
- a mixture containing 17% by weight of glycerol, 9 % by weight of ethylene glycol, 20 % by weight of propylene glycol, 26 % by weight of natural latex being a 60% (by weight) water emulsion, 25% by weight of water was made and then while mixing carefully 3% by weight of the product obtained by oxyethylenating of alcohols of fraction C12-14 (coconut fraction) with 22 moles of oxirane in the presence of an alkaline catalyst (NaOH).
- NaOH alkaline catalyst
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Material Composition (AREA)
Abstract
Composition d'étanchéité pour pneumatiques automobiles. La composition comprend au moins un alcool polyhydrique issu d'un groupe comprenant du glycérol, de l'éthylène glycol, du propylène glycol, du latex naturel, de l'eau et éventuellement des charges minérales, ainsi qu'un copolymère séquencé amphiphile qui est un mélange par polydispersion de composés de la formule générale (I) et (II), dans la quantité de 1 à 5 % en poids, des composés de type (I) étant un mélange par polydispersion ayant la teneur d'homologues individuels définis par la distribution de Poisson ou une autre distribution similaire à la distribution de Poisson, avec une teneur moyenne en unités mères d'oxyde de propylène pour 1 mole de 2-éthylhexan-l-ol et des variances se situant dans la plage de 1-3 et la teneur moyenne en unités mères d'oxyde d'éthylène pour 1 mole de 2-éthylhexan-l-ol et des variances tombant dans la plage de 8-13.
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PCT/PL2017/000014 WO2018156036A1 (fr) | 2017-02-23 | 2017-02-23 | Composition d'étanchéité pour pneumatiques |
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