JP2015129216A - sealant composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealant composition for repairing a puncture of a tire which has good sealability and stability, is easy to handle and hardly decomposed and has low viscosity increase at a low temperature and a long service life.SOLUTION: There is provided a sealant composition which comprises a latex emulsion, nano-porous particles, a surfactant, an antifreeze agent, a humectant and water, where the nano-porous particles contain at least one of zeolite, a silica aerosol gel, mesoporous silicon dioxide, a carbon aerosol, mesoporous carbon, activated carbon, a cenosphere, diatomaceous earth, a porous metal and an organic chelate compound and the ratio is 0.01 to 5%. The antifreeze agent is at least one selected from propylene glycol, glycerin, diethylene glycol and 1,3-propanediol and the ratio is 40 to 90 wt.%. The ratio of the latex emulsion is 2 to 20 wt.%, the ratio of the surfactant is 0.1 to 2.5 wt.% and the ratio of the humectant is 0.01 to 5 wt.%.

Description

  The present invention relates to a sealant composition.

  Vehicle tires may be punctured by hard objects on the road, and the punctured tires become unstable in rotation. In such a situation, a traffic accident may occur and the vehicle driver may suffer physical damage. In order to avoid this situation, liquid sealants have been developed. As a temporary emergency measure, liquid sealant is used to repair punctured tires, which keeps the vehicle running until it reaches the repair site.

  Currently, liquid sealants on the market are made according to various formulations. Current formulations of liquid sealants include natural latex. For example, Patent Document 1 discloses a sealant comprising 55 to 60% by weight of deproteinized natural latex. Patent Document 2 discloses a sealant provided with 30 to 60% by weight of natural latex.

  For sealing purposes, a tackifier such as an aromatic terpene resin or a phenolic resin as pointed out in Patent Document 3 may be added to the sealant. Further, Patent Document 4 discloses that 20 to 40% by weight of VEVA copolymer resin is used as a tackifier. Patent Document 5 discloses that another material (for example, synthetic latex) is used as a tackifier.

  Since liquid sealants are used over a wide temperature range, most liquid sealants contain antifreeze. The choice of antifreeze is important in determining whether the viscosity of the liquid sealant is low. In Patent Documents 5 and 6, ethylene glycol or propylene glycol is used as an antifreeze.

  However, ethylene glycol is undesirable because it is harmful to the environment. Patent Documents 7 and 8 disclose glycerin, 1,3-propanediol and other antifreezes, respectively. In order to further reduce the viscosity, Patent Document 9 discloses that the same antifreezing effect as a large amount of pure glycerin can be achieved with a smaller amount of glycerin by adding potassium acetate to glycerin.

  In addition, solids can also be added to the liquid sealant to improve sealability. For example, in the preparation of the sealant disclosed in Patent Document 10, 2.5 to 10% by weight of fiber material is added to the sealant, and the latex component is suppressed to 1 to 10% by weight. Patent Document 11 discloses a sealant made of synthetic short fibers and rubber latex.

  In liquid sealants, particularly liquid sealants containing natural latex, the stability is important in addition to sealability. A surfactant is added to the liquid sealant to improve the stability of the liquid sealant. In general, adding an anionic surfactant to the liquid sealant achieves an excellent stabilizing effect, but at low temperatures the viscosity of the liquid sealant increases. Therefore, Patent Document 12 states that the use of a nonionic surfactant is preferable. Patent Document 11 discloses that the stability of a liquid sealant is improved as a configuration in which an anionic surfactant and a nonionic surfactant are used in combination.

  A number of sealant products have been developed so far, most of which contain a high weight percent (greater than 15% by weight) solids. Use of these sealant products may cause environmental pollution problems and cleanliness problems. However, other sealant products are unstable and the sealing effect of the tire is not good over a wide temperature range. Furthermore, the use of sealants composed of harmful components such as ethylene glycol is undesirable and, further, sedimentation problems can occur with the solid particles and fibers used in the sealant.

US Patent No. 6344499 B1 Specification US Pat. No. 6,992,119 B2 specification US Patent No. 6864305 B2 Specification US Patent No. 8148448 B2 specification US Patent Application Publication No. 2012-0277364 US Pat. No. 7,388,041 B2 U.S. Pat. No. 8,183,309 B2 US Pat. No. 7,868,061 B2 US Patent No. 7589135 B2 specification US Pat. No. 8,242,196 B2 Specification US Patent No. 8470909 B2 Specification US Patent Application Publication No. 2012-0118199 A1 Specification

  Then, this invention makes it a subject to provide the sealant composition which eliminates the fault that the sealing performance and stability in a prior art are not favorable.

  In order to solve the above problems, the present invention has the following configuration.

  A feature of the present invention is to provide a sealant composition, which includes a latex emulsion, nanoporous particles, a surfactant, an antifreeze, a wetting agent and water.

  Another feature is that the nanoporous particles include at least one of zeolite, silica aerogel, mesoporous silicon dioxide, carbon aerogel, mesoporous carbon, activated carbon, cenosphere, diatomaceous earth, and porous metal organic framework (MOF). In the point.

  Another feature is that the weight percent of nanoporous particles of the sealant composition ranges from 0.01% to 5%.

  Another feature is that the weight percent of antifreeze in the sealant composition ranges from 40% to 90%.

  Another feature is that the antifreeze includes at least one of propylene glycol, glycerin, diethylene glycol, and 1,3-propanediol.

  Another feature is that the weight percentage of latex emulsion of the sealant composition ranges from 2% to 20%.

  Another feature is that the surfactant weight percent of the sealant composition ranges from 0.1% to 2.5%.

  Another feature is that the weight percent of the wetting agent in the sealant composition ranges from 0.01% to 5%.

  Another feature is that the sealant composition includes an antifreeze additive, and the antifreeze additive includes an inorganic salt and / or an organic salt.

  Another feature is that the sealant composition further includes an auxiliary additive, which includes an anti-corrosive additive, an insecticide, a pH adjuster, a foam inhibitor, an antiseptic, a colorant and an odorant. It is in the point that at least one of is included.

  According to the sealant composition of the present invention, a punctured tire can be sufficiently sealed. Furthermore, since this sealant composition is easy to use and resistant to spoilage and can be stored for a long time, sufficient demand is expected in the market.

  The present invention discloses a sealant composition for repairing a tire. Sealant compositions include latex emulsions and solid particles and fibers configured to achieve a sealing purpose. As the sealant composition passes through the tire hole, the differential pressure between the inside and outside environment of the tire generates a large shear force. This shear force creates a latex-emulsion solid rubber. Thus, the tire hole is sealed.

  Specifically, the sealant composition of the present invention includes latex emulsions, nanoporous particles, surfactants, antifreeze agents, wetting agents and water. In addition, the sealant composition includes an antifreeze additive.

  Furthermore, natural latex or synthetic latex may be used for the latex emulsion of the present invention. If the latex emulsion is natural latex, natural latex free of impurities (eg unwanted proteins, lipids, minerals, inorganic ions) and other contaminants should be preferred and procurable. The quality of natural latex depends on the source of the latex material. The latex emulsion may also be a synthetic latex such as NBR or SBR. In the present invention, the weight percent of the latex emulsion of the sealant composition is between 2% and 20%, preferably between 6% and 11%.

  Furthermore, the nanoporous particles of the present invention may be granular, fibrous or other shapes. Since the nanoporous particles have a nanoporous structure, they have a low density, so that the settling rate of the sealant composition containing the nanoporous particles is lowered. In addition, since the nanoporous particles have a low density, a small amount (per weight) of nanoporous particles improves the sealability of the tire hole of the sealant composition. Demand for a wider market than normal sealant compositions is expected. In the present invention, a small amount of nanoporous particles contained in the sealant composition is deposited or precipitated, but the precipitated or settled nanoporous particles are easily dispersed again by slightly shaking the sealant composition. To do.

  Nanoporous particles include zeolite, silica aerogel, mesoporous silicon dioxide, carbon aerogel, mesoporous carbon, activated carbon, cenosphere, diatomaceous earth, and at least one of porous metals and organic chelating compounds (eg, metal organic framework) . In the present invention, nanoporous particles having chitosan gel particles may be added to the sealant composition. A method of adding chitosan gel particles to this sealant composition is disclosed in Patent Document 12.

The pore size of the nanoporous particles of the present invention is at least 0.5 nanometers and preferably greater than 2 nanometers, and the porosity is between 0.1 and 0.95. Further, the nanoporous particles may be granular, fibrous or other shapes, and the particle size is less than 100 microns. Furthermore, the specific surface area of the nanoporous particles measured by the nitrogen absorption measurement method needs to exceed 100 m ² / g. The weight percent of nanoporous particles in the sealant composition is between 0.01% and 5%, preferably between 0.1% and 1%.

  In addition, the sealant composition of the present invention contains water and is used as a medium configured to float latex emulsion and nanoporous particles. The weight percent of water in the sealant composition is between 0.01% and 42%.

  The sealant composition of the present invention includes at least one antifreeze (eg, glycol). Antifreeze agents are used to extend the usable temperature range of the sealant composition. This antifreeze contains at least one of propylene glycol, glycerin, diethylene glycol, 1,3-propanediol and the like. The weight percent of antifreeze in the sealant composition in the present invention is between 40% and 90%. Moreover, when two or more types of antifreeze agents are included in the sealant composition, there is no restriction on the mixing ratio of different types of antifreeze agents.

  In addition, antifreeze additives may be added to the sealant composition, the weight percentage of which is between 0.01% and 10%. Antifreeze additives include inorganic salts and / or organic salts (eg, potassium acetate) and are used to improve the antifreeze effect of the sealant composition. The usable temperature range of the sealant composition of the present invention is between −40 ° C. and 80 ° C.

  Further, the sealant composition contains at least one kind of surfactant. Surfactants are used to improve the stability of latex emulsions, thereby extending the useful life of the sealant composition. The surfactant may be added directly to the sealant composition or mixed with the latex emulsion and then added to the sealant composition.

  The surfactant may be an anionic surfactant and / or a nonionic surfactant. The nonionic activator may be at least one of polyoxyalkylene / alkyl ether, polyoxyalkylene / alkenyl ether, polyoxyethylene alkylamine and triethanolamine / lauric acid ester. The anionic surfactant may be SDS. SDS increases the viscosity of the sealant composition, but effectively stabilizes the latex emulsion of the sealant composition.

  The sealant composition may include a composite surfactant composed of a mixture of different types of surfactants, and the type of surfactant constituting the composite surfactant may be selected from latex latex used in the sealant composition. Selected according to the type and amount of emulsion. The composite surfactant is a mixture of different types of nonionic surfactants, a mixture of at least one nonionic surfactant and at least one anionic surfactant, or a mixture of different types of anionic surfactant. May be.

  The weight percent of surfactant in the sealant composition of the present invention is between 0.1% and 2.5%.

  In addition, the sealant composition includes a wetting agent (eg, alcohol, ether or ester) used to improve the wettability, viscosity and spreadability of the sealant composition. The wetting agent is used to reduce the surface tension of the sealant composition, which makes it easier for the sealant composition to spread to the end surface area of the tire. Thus, the sealant composition can effectively seal punctures in the tread region of the tire.

  The wetting agent of the present invention may be ethanol, propanol, isopropanol, ethyl butyrate, dimethyl succinate or other chemicals. Since the surface tension of these wetting agents is small, the surface tension of the sealant composition is effectively reduced when added to the sealant composition. The weight percent of wetting agent in the sealant composition of the present invention is between 0.01% and 5%. It is clear that the wetting agent reduces the contact angle of the sealant composition. On the other hand, the wetting agent improves the antifreeze effect and stability effect of the sealant composition.

  In addition, auxiliary additives may be included in the sealant composition. Auxiliary additives include at least one of anti-corrosive additives, insecticides, pH adjusters, foam inhibitors, preservatives, colorants and odorants. Auxiliary additives are used to add the corresponding function of the sealant composition.

  For example, preservatives can be added to protect the biodegradable components of the sealant composition, thereby extending the useful life of the sealant composition to 5 years or more.

  The corrosion resistant additive is added to the sealant composition to prevent rusting inside the tire. The colorant is used to color the sealant composition, and the odorant is used to remove the irritating odor of the sealant composition. Colorants and odorants do not cause any adverse effect on the sealability of the sealant composition. Anti-foaming agents are optionally added to prevent foaming of the sealant composition. The pH adjuster is used to adjust the pH of the sealant composition. When the pH of the sealant composition exceeds 8, the latex emulsion of the sealant composition becomes more stable. The weight percent of auxiliary additives in the sealant composition is between 0.01% and 1%.

  The sealant composition of the present invention exhibits a significant sealing effect against the resulting tire hole due to spikes having a length of less than 8 mm. With the sealant composition, the tire hole sealing effect lasts about 12 to 48 hours.

  The viscosity of the sealant composition of the present invention ranges from 18 mPas to 800 mPas and varies with the ambient temperature. The pH of the sealant composition is adjusted to exceed 8, preferably in the range of 8-11. When the pH of the sealant composition is between 8 and 11, the latex emulsion of the sealant composition is more stable.

  Furthermore, when the dense solid particles used in typical sealant compositions are used in place of nanoporous particles, the sealant composition does not develop overt for at least 24 hours.

  When surfactants and preservatives are added to the sealant composition, the sealant composition can maintain its original function for more than 5 years.

  In use, the sealant composition is injected into the tire through the hose by the action of compressed air, the injection pressure is preferably from 2.5 bar to 10 bar, and the tire valve core may be removed. Further, since the sealant composition spreads and reaches the end surface region of the tire, the puncture in the tire tread region is effectively sealed.

  In order to test the sealant performance of the tire sealant composition, the tire is drilled with spikes having a length of less than 8 mm. A tire is mounted on a vehicle and a sealant composition is injected into the tire. Drive a vehicle with tires under 20km. Each time the vehicle travels 2-5 km, the tire's internal air pressure is measured to check for tire air leaks. Thus, the sealing effect on the tire hole (which is caused by the sealant composition) is recorded by the method described above.

  When the damping rate of the tire internal air pressure is less than 0.2 bar, it indicates that the sealant composition has successfully sealed the tire hole, that is, the sealing effect of the sealant composition is good. Remove the tire from the vehicle and keep it stationary so that the tire hole faces upward. In order to check the sealability, the tire air pressure decay rate may be measured again after 24 or 48 hours.

  The useful life of the sealant composition is determined by static aging tests and thermodynamic tests. In the static aging test, the sealant composition is placed in an oven at a temperature of 70 ° C. or higher for 40 days or more, and the sealing effect of the sealant composition is examined as described above.

  Twelve examples of sealant compositions are shown below.

  The sealant composition includes 17.39 wt% water, 55 wt% glycerin, 20 wt% natural latex, 5 wt% ethanol, 1 wt% nonionic active agent, 1.5 wt% anion. A surfactant, 0.01 wt% silica airgel and 0.1 wt% auxiliary additives are included.

  The sealant composition includes 32.01% by weight water, 40% by weight glycerin, 5% by weight potassium acetate, 5% by weight inorganic salt, 10% by weight natural latex, 2.5% by weight ethanol, % By weight nonionic active agent, 0.5% by weight anionic surfactant, 1% by weight mesoporous silicon dioxide, 0.5% by weight silica aerogel, 1.99% by weight activated carbon and 0.5% by weight % Auxiliary additives.

  The sealant composition includes 33.15 wt% water, 50 wt% glycerin, 14 wt% synthetic latex, 2.2 wt% ethanol, 0.35 wt% nonionic active agent, 0.2% Weight percent cenospheres and 0.1 weight percent auxiliary additives are included.

  The sealant composition includes 38.3 wt% water, 48 wt% glycerin, 10 wt% synthetic latex, 2.5 wt% ethanol, 0.7 wt% nonionic active agent, 0.2 wt% Weight percent anionic surfactant, 0.2 weight percent silica aerogel and 0.1 weight percent auxiliary additives are included.

  The sealant composition includes 38.2 wt% water, 48 wt% 1,3-propanediol, 10 wt% synthetic latex, 2.5 wt% ethanol, 0.7 wt% nonionic activity. Agent, 0.3% by weight anionic surfactant, 0.2% by weight mesoporous carbon and 0.1% by weight auxiliary additives.

  The sealant composition includes 38.35 wt% water, 48 wt% propylene glycol, 10 wt% synthetic latex, 2.5 wt% isopropanol, 0.7 wt% non-ionic active agent,. 3% by weight anionic surfactant, 0.05% by weight silica aerogel and 0.1% by weight auxiliary additives are included.

  The sealant composition includes 14.7% water, 70% glycerin, 5% inorganic salt, 5% natural latex, 2% nonionic active agent, 2% silica aero. Gel, 1 wt% zeolite and 0.3 wt% auxiliary additive are included.

  The sealant composition includes 2.8% water, 90% propylene glycol, 2% synthetic latex, 0.1% anionic surfactant, 2% silica aerogel, 3% by weight. Of carbon aerogel and 0.1% by weight of auxiliary additives.

  The sealant composition includes 40.3% by weight water, 45% by weight propylene glycol, 2% by weight potassium acetate, 8% by weight synthetic latex, 2.5% by weight isopropanol, 1% by weight nonionic. Activator, 0.6 wt% anionic surfactant, 0.2 wt% mesoporous silicon dioxide, 0.1 wt% silica aerogel, 0.1 wt% carbon aerogel, 0.1 wt% cenosphere And 0.1% by weight of auxiliary additives.

  The sealant composition includes 34.3% by weight water, 48% by weight propylene glycol, 2% by weight potassium acetate, 10% by weight synthetic latex, 1% by weight isopropanol, 2% by weight n-propanol, 0% 0.7 wt% nonionic active agent, 0.5 wt% anionic surfactant, 0.2 wt% mesoporous silicon dioxide, 0.2 wt% activated carbon, 0.1 wt% cenosphere and 1 wt% % Auxiliary additives.

  The sealant composition includes 28.6 wt% water, 54 wt% glycerin, 10 wt% synthetic latex, 5 wt% ether, 1 wt% nonionic active agent, 0.1 wt% anion. Surfactant, 0.2 wt% activated carbon, 0.1 wt% cenosphere and 1 wt% auxiliary additive are included.

  The sealant composition includes 28.6 wt% water, 54 wt% glycerin, 10 wt% synthetic latex, 5 wt% ester, 1 wt% nonionic active agent, 0.1 wt% anion. Surfactant, 0.2 wt% activated carbon, 0.1 wt% cenosphere and 1 wt% auxiliary additive are included.

  Table 1 shows the test results of the above 12 examples of the present invention as follows.

  The viscosity of the sealant composition of the present invention is in the range of 18 mPas to 800 mPas and its pH is in the range of 8 to 11. The usable temperature of the sealant composition is in the range of -40 ° C to 80 ° C. The sealant composition can seal the tire hole for more than 24 hours. After the sealant composition is used to seal the tire hole, it can be easily removed by washing with water.

  Thus, the sealant composition of the present invention can sufficiently seal the tire hole. Furthermore, since the sealant composition is easy to use and hardly perishes and has a long useful life, sufficient demand is expected.

  The above-described embodiments are intended to be illustrative and not limiting. The design of the present invention can be changed as appropriate by using conventionally known techniques.

  It can be used for puncture repair of tires of vehicles and the like and is industrially useful.

Claims (10)

A sealant composition comprising a latex emulsion, nanoporous particles, a surfactant, an antifreeze agent, a wetting agent and water. The nanoporous particle includes at least one of zeolite, silica aerogel, mesoporous silicon dioxide, carbon aerogel, mesoporous carbon, activated carbon, cenosphere, diatomaceous earth, porous metal, and organic chelate compound. Sealant composition. The sealant composition according to claim 1 or 2, wherein a ratio of the nanoporous particles is 0.01 to 5% by weight. The sealant composition according to any one of claims 1 to 3, wherein a ratio of the antifreeze agent is 40 to 90% by weight. The sealant composition according to any one of claims 1 to 4, wherein the antifreeze contains at least one of propylene glycol, glycerin, diethylene glycol, and 1,3-propanediol. The sealant composition according to any one of claims 1 to 5, wherein a ratio of the latex emulsion is 2 to 20% by weight. The sealant composition according to any one of claims 1 to 6, wherein a ratio of the surfactant is 0.1 to 2.5% by weight. The sealant composition according to any one of claims 1 to 7, wherein a ratio of the wetting agent is 0.01 to 5% by weight. The sealant composition according to any one of claims 1 to 8, comprising an antifreeze additive, wherein the antifreeze additive contains an inorganic salt and / or an organic salt. An auxiliary additive is included, and the auxiliary additive includes at least one of a corrosion-resistant additive, an insecticide, a pH adjuster, a foam inhibitor, an antiseptic, a colorant, and an odorant. The sealant composition according to any one of the above.