KR102199045B1 - Sealant composition - Google Patents

Abstract

A sealant composition is provided; The sealant composition includes a latex emulsion, nanoporous particles, a surfactant, an antifreeze agent, a wetting agent, and water. The sealant composition of the present application achieves good sealing performance against puncture of the tire. Moreover, the sealant composition is easy to use, does not perish easily, and has a long shelf life which gives the sealant composition a good market prospect.

Description

Sealant composition {SEALANT COMPOSITION}

This application relates to a sealant composition.

Vehicle tires can be punctured by hard objects on the road, and flat tires can roll unstable. Such situations can lead to traffic accidents and physical harm to the vehicle driver. To avoid this situation, a kind of liquid sealant is developed. As a temporary emergency method, liquid sealant can be used to repair a flat tire, as a result of which the vehicle can continue driving until it reaches the workshop.

Currently, liquid sealants on the market can be made according to a variety of formulations. The most current formations of liquid sealants include natural latex. For example, invention patent US 6344499 B1 discloses a type of sealant comprising 55-60 wt% of a deproteinized natural latex. Another invention patent US 6992119 B2 discloses a kind of sealant comprising 30-60 wt% of natural latex. For sealing purposes, various kinds of tackifiers such as aromatic terpine resins or phenolic resins can be added to the sealant as described in invention patent US 6864305 B2. In addition, invention patent US 8148448 B2 discloses that 20 to 40 wt% of VEVA copolymer resin can be used as a tackifier. Invention patent US 20120277364 A1 discloses that other materials such as synthetic latex can also be used as a tackifier.

Because liquid sealants can be applied over a wide temperature range, most types of liquid sealants contain antifreeze agents. The choice of cryoprotectant is important in determining whether the liquid sealant has a low viscosity. In invention patent US 6344499 B1 and invention patent US 6864305 B2, ethylene glycol or propylene glycol can be used as antifreeze agents. However, since ethylene glycol is toxic to the environment, ethylene glycol is not preferred. Patent US 7388041 B2 and patent US 8183309 B2 disclose glycerin, 1, 3-propanediol, and other anti-freeze agents, respectively. In order to further reduce the viscosity, patent US 7388041 B2 discloses that potassium acetate can be added to glycerin so that using a small amount of glycerin achieves the same anti-freeze effect as using a large amount of pure glycerin.

Moreover, in order to improve the sealing performance, solid ingredients can also be added to the liquid sealant. For example, in the sealant formulation disclosed by patent US 7868061 B2, 2.5 to 10 wt% of fiber material is added to the sealant and the latex component is reduced to 1 to wt%. In another invention patent US 7589135 B2 a type of sealant is disclosed comprising synthetic short fibers and rubber latex.

Apart from the sealing performance, the stability of the liquid sealant is also important, especially in liquid sealants comprising natural latex. Surfactants can be added to the liquid sealant to improve the stability of the liquid sealant. In general, anionic surfactants added to liquid sealants can achieve a good stabilizing effect, but it can lead to liquid sealants of high viscosity, especially at low temperatures. Thus, patent US 8242196 B2 states that it is preferred to use nonionic surfactants. Inventive patent US 8470909 B2 discloses a combination comprising both anionic surfactants and nonionic surfactants, configured to improve the stability of liquid sealants.

Although a number of sealant products have been developed, most of them contain solid inclusions with a large mass percentage (15 wt% or more). When these sealant products are used, they can cause environmental pollution problems or cleanliness problems. However, other sealant products may not be available over a wide temperature range or may not have a good tire sealing effect. Moreover, the use of a sealant comprising toxic components such as ethylene glycol is undesirable, and solid particles and fibers used in the sealant can cause deposition problems.

It is an object of the present invention to provide a sealant composition for the purpose of disadvantages of poor stability and sealing performance of the sealant in the prior art.

The technical solution of the present application for solving the technical problems is as follows.

In one aspect, a sealant composition is provided, wherein the sealant composition comprises a latex emulsion, nanoporous particles, a surfactant, an antifreeze agent, a wetting agent, and water.

In one embodiment, the nanoporous particles are at least one of zeolite, silica aerogel, mesoporous silica, carbon aerogel, mesoporous carbon, activated carbon, cenosphere, diatomaceous earth, porous organic metal frameworks (MOFs). Includes.

In another embodiment, the weight percentage of nanoporous particles in the sealant composition ranges from 0.01% to 5%.

In another embodiment, the weight percentage of cryoprotectant in the sealant composition ranges from 40% to 90%.

In another embodiment, the cryoprotectant comprises at least one of propylene glycol, glycerin, diethylene glycol, and 1,3-propanediol.

In another example, the weight percentage of the latex emulsion in the sealant composition ranges from 2% to 20%.

In another embodiment, the weight percentage of surfactant in the sealant composition ranges from 0.1% to 2.5%.

In another embodiment, the weight percentage of wetting agent in the sealant composition ranges from 0.01% to 5%.

In another embodiment, the sealant composition further comprises an anti-freeze additive, and the anti-freeze additive comprises inorganic salts and/or organic salts.

In another embodiment, the sealant composition further includes an auxiliary additive, and the auxiliary additive includes at least one of a corrosion resistant additive, an insecticide, a pH-adjusting agent, an antifoaming agent, a preservative, a colorant, and an odorant.

The sealant composition of the present application achieves good sealing performance against puncture of the tire. Moreover, the sealant composition is easy to use, does not perish easily, and has a long shelf life which gives the sealant composition a good market prospect.

This application discloses a sealant composition for repairing tires. The sealant composition includes a latex emulsion, and solid particles and fibers configured to achieve the sealing purpose. When the sealant composition flows through a tire puncture, the pressure difference between the inside and outside environment of the tire generates a large shear force, and the shear force causes the latex emulsion to form a solid rubber. In this way, the tire puncture is sealed.

In particular, in the present application, the sealant composition includes a latex emulsion, nanoporous particles, a surfactant, an antifreeze agent, a wetting agent, and water. Moreover, the sealant composition further comprises an anti-freeze additive.

Moreover, in this application, the latex emulsion may be a natural latex or a synthetic latex. If the latex emulsion is a natural latex, a natural latex that does not contain impurities such as unwanted proteins, lipids, minerals, inorganic ions, and other contaminants is preferred and should be obtainable by purchase. The quality of natural latex depends on the source of the latex material. The latex emulsion can also be a synthetic latex such as NBR or SBR. In the present application, the weight percentage of the latex emulsion in the sealant composition is in the range of 2% to 20%, preferably in the range of 6% to 11%.

Moreover, in the present application, nanoporous particles may be granular, fibrous, or other shapes. The nanoporous particles have a low density because of the nanoporous structures, so the possibility of deposition of the sealant composition comprising the nanoporous particles is reduced. In addition, a small amount (by weight) of the nanoporous particles can effectively improve the sealing performance of the sealant composition against tire punctures due to the low density of the sealant composition, and as a result, the sealant composition containing the nanoporous particles is a conventional sealant composition. Have a broader market outlook than those.

In particular, in the present application, a small amount of nanoporous particles included in the sealant composition may be deposited or settled, but the deposited or precipitated nanoporous particles may be easily dispersed again by slightly shaking the sealant composition. The nanoporous particles may contain at least one of zeolite, silica aerogel, mesoporous silica, carbon aerogel, mesoporous carbon, activated carbon, cenosphere, diatomaceous earth, and porous metal and organic chelate compounds (e.g., metal organic frameworks). I can. Moreover, in the present application, nanoporous particles with chitosan gel particles can also be added to the sealant composition, and a method for adding chitosan gel particles in the sealant composition is disclosed in the previous invention patent US 20120118199 A1.

In the present application, the pore size of the nanoporous particles is at least 0.5 nm, preferably greater than 2 nm, and the porosity of the nanoporous particles is in the range of 0.1 to 0.95. Further, the nanoporous particles can be granular, fibrous, or other shapes, and the particle size of the nanoporous particles is less than 100 microns. Moreover, when the specific surface area of the nanoporous particles is measured by the nitrogen absorption method, the specific surface area of the nanoporous particles must be greater than 100 m ² /g. The weight percentage of the nanoporous particles in the sealant composition is in the range of 0.01% to 5%, preferably in the range of 0.1% to 1%.

Moreover, in the present application, the sealant composition further includes a latex emulsion and water used as a medium configured to allow the nanoporous particles to be suspended. In the present application, the weight percentage of water in the sealant composition ranges from 0.01% to 42%.

In the present application, the sealant composition further comprises at least one kind of antifreeze agent, such as glycol. Antifreeze agents are used to widen the operating temperature range of the sealant composition. The cryoprotectant may be at least one of propylene glycol, glycerin, diethylene glycol, and 1, 3-propanediol. In the present application, the weight percentage of the antifreeze agent in the sealant composition is in the range of 40% to 90%. In addition, if the sealant composition contains two or more kinds of antifreeze agents, there is no limit to the ratio between the different kinds of antifreeze agents.

Moreover, the sealant composition may further comprise an anti-freeze additive, and the weight percentage of the anti-freeze additive in the sealant composition ranges from 0.01% to 10%. The anti-freeze additive includes inorganic salts and/or organic salts (eg, potassium acetate) used to improve the anti-freeze effect of the sealant composition. In this application, the operating temperature range of the sealant composition is between -40°C and 80°C.

Moreover, the sealant composition further comprises at least one type of surfactant. Surfactants are used to improve the stability of latex emulsions to extend the shelf life of the sealant composition. The surfactant may be added directly to the sealant composition or may also be added to the sealant composition after mixing with the latex emulsion.

The surfactant can be an anionic surfactant and/or a nonionic surfactant. The nonionic surfactant may be at least one of polyoxyalkylene alkyl ether, polyoxyalkylene alkenyl ether, polyoxyethylene alkylamine, and triethanolamine laurate. The anionic surfactant may be SDS. Although SDS can increase the viscosity of the sealant composition, it can effectively stabilize the latex emulsion in the sealant composition.

The sealant composition may include a complex surfactant formed by mixing different types of surfactants together, wherein the types of surfactants for forming the complex surfactants depend on the amount and type of latex emulsion used in the sealant composition. Can be chosen. The complex surfactant may be a mixture of different types of nonionic surfactants, a mixture of at least one type of nonionic surfactant and at least one type of anionic surfactant, or a mixture of different types of anionic surfactants.

In the present application, the weight percentage of the surfactant in the sealant composition is in the range of 0.1% to 2.5%.

Moreover, the sealant composition further includes a wetting agent (eg, alcohol, ether, or ester) used to improve the wettability, viscosity, and spreading properties of the sealant composition. Wetting agents are used to reduce the surface tension of the sealant composition, so that the sealant composition can more easily diffuse into the end surface area of the tire. Thus, the sealant composition can effectively seal punctures in the tread area of the tire.

In the present application, the wetting agent may be ethanol, propanol, isopropanol, ethyl butyrate, dimethyl succinate, or other compound materials. These wetting agents have a low surface tension, and as a result, the surface tension of the sealant composition can be effectively reduced when these wetting agents are added to the sealant composition. In this application, the weight percentage of the wetting agent in the sealant composition is in the range of 0.01% to 5%. It is evident that the wetting agent reduces the contact angle of the sealant composition. On the other hand, the wetting agent can improve the stabilizing effect and the anti-freezing effect of the sealant composition.

Additionally, the sealant composition may further include auxiliary additives. Auxiliary additives include at least one of corrosion resistant additives, pesticides, pH-adjusting agents, antifoaming agents, preservatives, coloring agents, and odorants.

Auxiliary additives are used to add the corresponding functions of the sealant composition. For example, preservatives can be added to the sealant composition to preserve bio-degradable components in the sealant composition, and as a result the shelf life of the sealant composition can be extended to 5 years or more. Corrosion resistant additives may be added to the sealant composition to prevent the interior of the tire from rusting. The colorant can be used to dye the sealant composition, and the odorant can be used to remove the pungent smell of the sealant composition. Colorants and odorants do not cause any adverse effect on the sealing properties of the sealant composition. Antifoaming agents may be optionally added to the sealant composition to prevent foaming of the sealant composition. The pH-adjusting agent is used to adjust the pH of the sealant composition. If the pH of the sealant composition is higher than 8, the latex emulsion in the sealant composition is more stable. The weight percentage of auxiliary additives in the sealant composition is adjusted from 0.01% to 1%.

The sealant composition of the present application can perform an important sealing effect against puncture of a tire caused by spikes having a length of 8 mm or less. The sealant composition can leave the puncture of the tire sealed for about 12 to 48 hours.

In the present application, the viscosity of the sealant composition is in the range of 18 to 800 mPas, and may vary depending on the ambient temperature. The pH of the sealant composition is adjusted to be 8 or more, preferably in the range of 8 to 11. When the pH of the sealant composition is between 8 and 11, the latex emulsion in the sealant composition is more stable. Moreover, when nanoporous particles are used to displace solid particles at a high density used in typical sealant compositions, the sealant composition does not cause apparent precipitation within at least 24 hours. When surfactants and preservatives are added to the sealant composition, the sealant composition can retain its proper function for at least 5 years. In use, the sealant composition is injected into the tire through a hose under the action of compressed air, where the injection pressure is preferably 2.5 to 10 bar, and the valve core of the tire may or may not be removed. . In addition, the sealant composition can diffuse to reach the end surface area of the tire, so that punctures in the tread area of the tire can also be effectively sealed.

To test the sealant performance of the sealant composition on tires, spikes having a length of 8 mm or less are used to form a puncture that forms over the tire. The tire is mounted on the vehicle, and the sealant composition is injected into the tire. The vehicle with the tire is then driven to travel 20 km or less. Every time the vehicle travels 2 to 5 km, air leakage in the tire is checked by measuring the internal tire pressure. In this way, the sealing effect on tire puncture caused by the sealant composition can be recorded by the aforementioned method. If the increment of the internal tire pressure is 0.2 bar or less, it is indicated that the sealant composition has successfully sealed the tire puncture, that is, the sealing performance of the sealant composition is good. After the tire is separated from the vehicle, the tire remains stationary with the tire puncture facing upwards. The pressure increment can be measured again after 24 or 48 hours to confirm the sealing performance.

The shelf life of the sealant composition can be tested by a static aging test and a heat dynamic test. In the static aging test, the sealant composition is placed in an oven for at least 40 days at a temperature of 70° C. or higher, so that the sealing performance of the sealant composition can be tested as described above.

Twelve examples of the sealant composition are shown as follows.

Example 1

The sealant composition was 17.39 wt% water, 55 wt% glycerin, 20 wt% natural latex, 5 wt% ethanol, 1 wt% nonionic surfactant, 1.5 wt% anionic surfactant, 0.01 wt% silica aerogel, and 0.1 It contains wt% auxiliary additives.

Example 2

The sealant composition is 32.01 wt% of water, 40 wt% of glycerin, 5 wt% of potassium acetate, 5 wt% of inorganic salts, 10 wt% of natural latex, 2.5 wt% of ethanol, 1 wt% of nonionic surfactant, 0.5 wt% of Anionic surfactant, 1 wt% mesoporous silica, 0.5 wt% silica aerogel, 1.99 wt% activated carbon, and 0.5 wt% auxiliary additives.

Example 3

The sealant composition contains 33.15 wt% of water, 50 wt% of glycerin, 14 wt% of synthetic latex, 2.2 wt% of ethanol, 0.35 wt% of nonionic surfactant, 0.2 wt% of cenosphere, and 0.1 wt% of auxiliary additives. Include.

Example 4

The sealant composition is 38.3 wt% of water, 48 wt% of glycerin, 10 wt% of synthetic latex, 2.5 wt% of ethanol, 0.7 wt% of nonionic surfactant, 0.2 wt% of anionic surfactant, 0.2 wt% of silica aerogel, And 0.1 wt% of auxiliary additives.

Example 5

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

Example 6

The sealant composition is 38.35wt% water, 48wt% propylene glycol, 10wt% synthetic latex, 2.5wt% isopropanol, 0.7wt% nonionic surfactant, 0.3wt% anionic surfactant, 0.05wt% silica aerogel , And 0.1 wt% of auxiliary additives.

Example 7

The sealant composition was 14.7 wt% water, 70 wt% glycerin, 5 wt% inorganic salts, 5 wt% natural latex, 2 wt% nonionic surfactant, 2 wt% silica aerogel, 1 wt% zeolite, and 0.3 wt% Contains auxiliary additives.

Example 8

The sealant composition contains 2.8 wt% of water, 90 wt% of propylene glycol, 2 wt% of synthetic latex, 0.1 wt% of anionic surfactant, 2 wt% of silica aerogel, 3 wt% of carbon aerogel, and 0.1 wt% of auxiliary additives. do.

Example 9

The sealant composition is 40.3 wt% of water, 45 wt% of propylene glycol, 2 wt% of potassium acetate, 8 wt% of synthetic latex, 2.5 wt% of isopropanol, 1 wt% of nonionic surfactant, 0.6 wt% of anionic surfactant, 0.2 wt% mesoporous silica, 0.1 wt% silica airgel, 0.1 wt% carbon aerogel, 0.1 wt% cenosphere, and 0.1 wt% auxiliary additives.

Example 10

The sealant composition is 34.3wt% water, 48wt% propylene glycol, 2wt% potassium acetate, 10wt% synthetic latex, 1wt% isopropanol, 2wt% n-propanol, 0.7wt% nonionic surfactant, 0.5wt% % Anionic surfactant, 0.2wt% mesoporous silica, 0.2wt% activated carbon, 0.1wt% cenosphere, and 1wt% auxiliary additives.

Example 11

The sealant composition is 28.6wt% water, 54wt% glycerin, 10wt% synthetic latex, 5wt% ether, 1wt% nonionic surfactant, 0.1wt% anionic surfactant, 0.2wt% activated carbon, 0.1wt% Of cenosphere, and 1 wt% of auxiliary additives.

Example 12

The sealant composition is 28.6wt% water, 54wt% glycerin, 10wt% synthetic latex, 5wt% ester, 1wt% nonionic surfactant, 0.1wt% anionic surfactant, 0.2wt% activated carbon, 0.1wt% Of cenosphere, and 1 wt% of auxiliary additives.

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

Example number At -30℃
Viscosity (mPas) Viscosity at 25℃ (mPas) pH Solid content (%) Sealing performance Aging tests Cream formation (wt%) One 239 35 11 12.3 Good pass <10 2 310 28 11.5 10 Good pass <10 3 165 32 10.5 9.3 Good pass <10 4 160 36 10.5 7.2 Good pass <10 5 130 18 10.8 7.3 Good pass <10 6 202 25 11 7.1 Good pass <10 7 720 25 10.9 8 Good pass <10 8 800 48 9 6.3 usually pass <10 9 220 26 8 6.6 Good pass <10 10 220 20 9.5 7.7 Good pass <10 11 250 20 10 7.4 Good pass <10 12 261 26 10 7.4 Good pass <10

In this application, the viscosity of the sealant composition is in the range of 18 mPas to 800 mPas; The pH of the sealant composition is in the range of 8-11. The operating temperature of the sealant composition is in the range of -40°C to 80°C. The sealant composition can seal the puncture of the tire for 24 hours or more. After the sealant composition is used to seal the tire puncture, it can be easily cleaned by water flushing.

In particular, the sealant composition of the present application achieves good sealing performance against puncture of the tire. Moreover, the sealant composition is easy to use, does not spoil well, and has a long shelf life giving the sealant composition a good market prospect.

Although embodiments of the present application have been described above with reference to the accompanying drawings, the present application is not limited to the specific implementations mentioned above. Indeed, the specific implementations mentioned above are intended to be illustrative and not limiting. In the inspiration of this application, a person of ordinary skill in the art can also make many modifications without departing from the scope of protection of the subject and claims of this application. All these variations are subject to the protection of this application.

Claims (10)

As a sealant composition for sealing tire puncture, the sealant composition comprises a latex emulsion, nanoporous particles, surfactant, antifreeze agent, wetting agent, and water, ,
The porosity of the nanoporous particles is in the range of 0.1 to 0.95,
The humectant is ethanol, propanol, isopropanol, ethyl butyrate, or dimethyl succinate. The method of claim 1,
The nanoporous particles are zeolite, silica aerogel, mesoporous silica, carbon aerogel, mesoporous carbon, activated carbon, cenosphere, diatomaceous earth, and porous metal. metal), and organic chelating compounds. The method of claim 1,
The weight percentage of the nanoporous particles in the sealant composition is in the range of 0.01% to 5%, the sealant composition. The method of claim 3,
The sealant composition, wherein the weight percentage of the cryoprotectant in the sealant composition is in the range of 40% to 90%. The method of claim 4,
The cryoprotectant comprises at least one of propylene glycol, glycerin, diethylene glycol, and 1,3-propanediol. The method of claim 4,
The sealant composition, wherein the weight percentage of the latex emulsion in the sealant composition is in the range of 2% to 20%. The method of claim 6,
The sealant composition, wherein the weight percentage of the surfactant in the sealant composition is in the range of 0.1% to 2.5%. The method of claim 7,
The sealant composition, wherein the weight percentage of the humectant in the sealant composition is in the range of 0.01% to 5%. The method of claim 8,
The sealant composition further comprises an anti-freezing additive, wherein the anti-freezing additive comprises inorganic salts and/or organic salts. The method of claim 9,
The sealant composition further includes an assisted additive, and the auxiliary additive is an anti-corrosion additive, an insecticide, a pH-modifier, an antifoaming agent, a preservative, a colorant, and an odorant. ) Comprising at least one of, a sealant composition.