TW201518487A - Sealant composition and preparation method thereof - Google Patents

Abstract

The present invention relates to a sealant composition and its preparation method for patching perforations on a punctured tire. The sealant composition contains 80-95 wt% of liquid carrier, 0.1 to 10 wt% of gel material derived from water soluble polymer, 1-10 wt% of a latex, 0.1-5wt% of rigid particles and 0.1 to 5 wt% of surfactant. If needed, the sealant composition may be added with 0.1-1 wt% of additives, such as defoamers, preservatives, corrosion inhibitors, coloring agents and fragrances. The present invention also relates to a method of preparing the sealant composition.

Description

Sealant composition and preparation method thereof

The present invention relates to a sealant composition, particularly a sealant composition for use in repairing perforations in a tire, and to a method of making the sealant composition.

Hard objects on the road, such as nails and stones, occasionally puncture the tires, and the air leaks from the perforations, causing the tires to flatten, which is likely to cause traffic accidents and cause damage to the driver. The liquid tire sealant composition can be used to temporarily seal the perforations during tire operation, providing the driver with a temporary emergency remedy that allows the driver to continue the journey and seek help after the tire has been punctured. This is especially important for vehicles on the road.

In general, the liquid tire sealant composition is composed of a sealing material, a tackifier, and a solvent containing an antifreeze. Common sealing materials include latex, butyl rubber and various particulate materials. Tackifiers are chemicals used to increase adhesion, and tackifiers commonly used in tire sealant compositions are resin compounds. Antifreeze agents, such as ethylene glycol and propylene glycol, can be used to reduce the freezing point of the tire sealant composition, thereby preventing the sealant composition from solidifying in a low temperature operating environment.

In the past few decades, various liquid tire sealant compositions have been invented. In the early stages, as described in the related patents, including but not limited to the European Patent No. 1382654 A1, U.S. Patent No. 6,992,119 B2, and No. 0,142,420 A1, the most common sealant composition is butyl rubber and / or latex composition. The disadvantages of these ingredients are insufficient stability, ie a short shelf life, odor problems and difficulty in cleaning up after use.

Further improved tire sealant compositions are disclosed in U.S. Patent Nos. 4,337,322 and 4,588,758, using asbestos fibers, ethylene glycol and detergents as the main components in a valve-open sealant composition. However, it is well known that asbestos fibers are carcinogenic, and ethylene glycol is also toxic to the environment.

In view of the environmental factors, a non-petroleum based tire sealant composition is disclosed in U.S. Patent No. 5,059,636, which uses vulcanized rubber powder, wheat flour, calcium salt and the like. However, this sealant composition has the disadvantage of requiring the valve plug on the tire to be removed prior to use, i.e., the open-valve sealant composition.

At the same time, a sealant composition based on the "log-jam" mechanism has begun to attract attention. The mechanism of "logging of logs" is the effect of the pressure difference between the inside and outside of the liquid tire. When flowing through the perforation, the particles in the liquid medium are The perforations accumulate and in turn cause the perforations to be blocked. Sealant compositions based on this mechanism are disclosed in U.S. Patent Nos. 5,772,747 and 5,856,376, all of which are incorporated herein by reference.

In the formulation disclosed in U.S. Patent No. 6,013,697, bentonite and mica are primarily used, which fill the perforated voids and form plugs to prevent further gas leakage. The sealant composition is a valve-through sealant composition that eliminates the need to remove the tire spool prior to use, is more convenient and environmentally friendly, and has a fast seal. However, the precipitation and flocculation of the clay platelet is a major problem in the sealant composition.

Other sealant compositions based on log plugging mechanisms include, but are not limited to, US Patent 2002/0077391 A1, 2007/0129464 A1, 2007/0203260, International Patent WO 2008/022402, PCT/AU2008/001499, in Sealants There have been many innovations in the composition of the composition. This type of tire sealant composition has the advantages of being odorless, having a long shelf life, and being easy to clean after use, but its sealing performance is relatively poor.

In addition to the principle of log plugging, another type of sealant composition is based on a viscous latex suspension. A latex suspension is a highly viscous fluid that adheres firmly to the perforated wall and eventually blocks the gas leak path. However, the disadvantages of latex-based sealant compositions include difficulty in cleaning after use, indeterminate blocking properties, irritation to the skin of the eyes, and the use of volatile organic compounds.

Recently, we have disclosed a through-type tire perforated sealant composition containing dissolved and undissolved natural biomaterials, antifreeze and other rigid particles, which are environmentally friendly, cost-effective, and cost-effective in the US Patent No. 2012/0118199 A1. advantage.

The technical problem to be solved by the present invention is to provide a through-type tire sealant composition which is environmentally friendly, has less sedimentation, has a long shelf life, can be quickly sealed, and is easy to clean after use, in view of the above-mentioned drawbacks of the prior art.

Accordingly, another technical problem to be solved by the present invention is to provide a method for preparing a through-type tire sealant composition which is environmentally friendly, has little sedimentation, has a long shelf life, can be quickly sealed, and is easily cleaned after use.

In the case of the sealant composition, the technical solution of the present invention to solve the above problems is: a novel reinforced tire sealant composition based on a combination mechanism of log blockage and viscous gel clogging. The sealant composition comprises 80-95% by weight of a liquid carrier, 0.1-10% by weight of a gel material derived from a water-soluble polymer, 1-10% by weight of a latex, and the weight percentage is 0.1 to 5% of the rigid particles as a filler and 0.1 to 5% by weight of a surfactant.

To extend the operating temperature range for use in a liquid sealant composition, the liquid carrier comprises water and an antifreeze; the antifreeze comprising at least one of ethylene glycol, propylene glycol and glycerin: ethylene glycol in the sealant composition The percentage by weight is 5-70%, the weight percentage of propylene glycol in the sealant composition is 5-70%, and the weight percentage of glycerin in the sealant composition is 5-60. %.

The water-soluble polymer comprises a naturally-derived water-soluble polymer and/or a synthetic water-soluble polymer, and the weight percentage of the rigid particles as the filler in the sealant composition is preferably 1-3%, and the particle size is 0.05. In the range of 320 μm, the rigid particles form a plug at the perforations, and the gel material derived from the water-soluble polymer enhances the sealing property by filling the voids at the perforations, and the addition of the latex further improves the sealing performance of the sealant composition. The latex comprises at least one of a pure natural latex, a synthetic latex, and an improved natural latex. In order to improve the stability of the latex component and the wettability and spreadability of the liquid sealant composition in the tire, it is necessary to add at least one suitable surfactant.

The sealant composition further comprises from 0.1% to 1% by weight of an additive, including at least one of an antifoaming agent, an anticorrosive agent, a preservative, a colorant, and a fragrance, in accordance with respective functional requirements. Further, the sealant composition further contains from 0.05 to 3% by weight of bentonite to reduce precipitation.

The sealant composition has a viscosity in the range of 19.3 - 5000 mPas, a pH in the range of 8 - 10, and a sealing function effective in the range of -40 ° C to 80 ° C.

In terms of the preparation method of the sealant composition, the present invention solves the above technical solution: the preparation method comprises the following steps with respect to 100 parts by weight of the sealant composition:


a. converting from 0.1 to 10 parts by weight of the water-soluble polymer into a derivatized gel material in 80 to 95 parts by weight of the liquid carrier;
b. adding 0.1-5 parts by weight of rigid particles and 1-10 parts by weight of the latex in the gel suspension obtained in the step a and thoroughly mixing;
c. 0.1-5 parts by weight of a surfactant is added to the composition obtained in step b.

When the water-soluble polymer is selected from chitosan, the method for converting the water-soluble polymer into a derivatized gel material relative to 100 parts by weight of the sealant composition comprises the following steps:

a. Adding 0.1-10 parts by weight of chitosan to 10-60 parts by weight of water;
b. Adding an appropriate amount of acid to the solution obtained in a, adjusting the pH of the solution to a range of 0-5;
c. After the chitosan is completely dissolved, the derivatized gel material can be obtained by adding an appropriate amount of hydrazine and raising the pH of the solution to a range of 8-10.

The adhesive composition of the present invention has the beneficial effects that the sealant composition is environmentally friendly, safe and non-toxic, and can effectively seal the tire perforations in an instant; and the size of the perforations that can be sealed is determined by the particles in the solid component of the sealant composition. Depending on the size and number, it seals the perforations formed by punctures of 6.35 mm or more in diameter. It is a straight-through sealant composition that requires no need to remove the valve plug before injection and is very convenient to use. The sealant composition works well between -40oC and 80oC. The sealing effect can last from 12 to 48 hours or longer depending on the exact sealant composition; at the same time, the applied sealant composition can be easily cleaned with water after use.

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In order to make the objects, technical solutions and advantages of the present invention more comprehensible, the present invention will be further described in detail below with reference to the embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the proposed embodiment of the present invention, the sealant composition for repairing perforations in a tire is a novel enhanced tire sealant composition based on a combination mechanism of log blockage and viscous gel clogging. The sealant composition comprises 80-95% by weight of a liquid carrier, 0.1-10% by weight of a gel material derived from a water-soluble polymer, 1-10% by weight of a latex, and the weight percentage is 0.1 to 5% of the rigid particles as a filler and 0.1 to 5% by weight of a surfactant.

To prepare 100 parts by weight of the sealant composition, the specific preparation method comprises the following steps:
a. converting from 0.1 to 10 parts by weight of the water-soluble polymer into a derivatized gel material in 80 to 95 parts by weight of the liquid carrier;
b. adding 0.1-5 parts by weight of rigid particles and 1-10 parts by weight of latex to the obtained gel suspension and thoroughly mixing;
c. Add 0.1-5 parts by weight of the surfactant and 0.1-1 part by weight of the additive to the composition obtained in b and mix well.

Preferably, 1. 0.1-10 parts by weight of the water-soluble polymer is converted into a derivatized gel material in 10-60 parts by weight of water; 2. Antifreeze is added to the gel suspension obtained in step 1, 0.1-5 weight Parts of the rigid particles and 1-10 parts by weight of the latex and thoroughly mixed; 3. Add 0.1-5 parts by weight of the surfactant and 0.1-1 part by weight of the additive to the composition obtained in the step 2 and mix well.

The water-soluble polymer may be a naturally-derived water-soluble polymer such as chitosan, sodium alginate, sericin or the like, or a synthetic water-soluble polymer such as polyvinyl alcohol. The water soluble polymer is converted to a flexible gel material by physical or chemical means.

In a preferred embodiment, chitosan is used as the water-soluble polymer for preparing the gel material, and the chitosan can be obtained by deacetylation of chitin extracted from the shell of the crustacean. The original form of chitosan is often present in rigid sheets that are soluble in acidic media, where the acid can be any type of acid, but dilute acetic acid and hydrochloric acid are preferred for low toxicity. The chitosan rigid sheet is placed in an acidic medium, and any type of ruthenium is added before the chitosan is dissolved. It is recommended to use sodium hydroxide to reprecipitate the chitosan by neutralization and obtain a reprecipitated shell. Glycans. Preferably, the method of converting the water soluble polymer chitosan to a derivatized gel material relative to 100 parts by weight of the sealant composition comprises the steps of:
a. adding 0.1-10 parts by weight of chitosan to 10-60 parts by weight of water;
b. adding a suitable amount of acid, preferably acetic acid, to the solution obtained in step a, adjusting the pH of the solution to a range of 0-5;
c. After the chitosan is completely dissolved, an appropriate amount of hydrazine, preferably sodium hydroxide, is added to adjust the pH of the solution to a range of 8-10, and the mixed gel material can be obtained by mixing uniformly.

The reprecipitated chitosan has a different particle structure than its original form, and it exhibits a soft, translucent and elastic gel material suspended in a liquid medium. During neutralization, the neutralization rate, the final pH of the solution, and the shear applied during mixing or homogenization will determine the exact size and hardness of the final derived gel particles. In a preferred embodiment, the water-soluble polymer is selected from chitosan, and the size and hardness of the gel particles are controlled to pass through a sixty-mesh sieve by controlling the applied shear force during mixing or homogenization; The composition comprises 0.1-10% by weight of reprecipitated chitosan prepared by dissolving 50-500 micron chitosan particles under acidic conditions, and suspended in liquid form. The final pH range of the solution is between 7 and 10.

In combination with the combined sealing mechanism of the sealant, other water-soluble polymers which can exist in the form of a gel material in a given liquid medium, such as sodium alginate, sericin and polyvinyl alcohol, are also used for preparing the sealant combination. Things.

Among them, polyvinyl alcohol as a synthetic water-soluble polymer can also be used to prepare the derivatized gel material, which is prepared by dissolving it in warm water and then allowing it to react with a suitable chemical reagent under controlled conditions. The derivatized gel material is obtained by reacting SDS (sodium dodecyl sulfate, sodium lauryl sulfate) or sodium citrate.

In order to enhance the sealing performance of the tire sealant composition, the gel material derived from the water-soluble polymer may be strengthened, and other reinforcing materials such as rigid particles and compounds of calcium, magnesium and other metal ions may be added. Pure natural and/or synthetic latexes are also added to the sealant composition to further improve sealing performance, and modified natural latexes such as deproteinized latex and deionized phosphorus-containing latex are also suitable for use in the present invention. The latex is present in the sealant composition in a weight percentage of from 1 to 10%, which is much lower than the latex content in conventional latex-based tire sealant compositions. In the experimental stage, when the latex is not added, that is, the weight percentage of the solid latex is 0% and the other components of the sealant composition are substantially the same, the straight-through effect of the obtained sealant composition is "good", that is, 90% or more is successful; The sealing effect is "average", meaning that only 50% or more is successful. Compared to the preferred embodiment given below, the sealing ability of the sealant composition after the addition of the latex is "good", and it can be seen that the latex as an important component of the sealant composition can significantly improve the sealing ability of the sealant composition.

In a preferred embodiment, the tire sealant composition also comprises from 0.1% to 5% by weight of rigid chitosan particles, with an optimum weight percentage of 1-3%. The specific chitosan has a particle size between 5 and 320 microns, preferably between 5 and 100 microns. As a rigid particle component in the sealant composition, it is not limited to a chitosan material, and other solid particles having a size of between 0.05 micrometers and 320 micrometers may be used for the present invention, such as hollow microbeads, vermiculite, calcium strontium. Materials such as stone, diatomaceous earth, kaolinite, mica, rubber powder, porous cerium oxide and tannin are also used in the preparation of the sealant composition. In order to reduce the precipitation rate, the specific gravity of the rigid particles is recommended to be less than 1.5, although particles having a higher density can be used. In addition, the addition of from 0.05% to 3% by weight of bentonite in the sealant composition can further prevent precipitation and settling in the sealant composition.

The rigid particles accumulate at the perforations based on the log plugging mechanism during the sealing process, and the plug formed by the plugging particles is combined with the gel material derived from the water soluble polymer in the solution. The preparation of the gel material has been described above, and it can make the sealing performance superior. The gel material and the rigid particles are compatible with each other without significant chemical reaction. In a preferred embodiment, the gel material used is the same source of reprecipitated chitosan as the rigid chitosan particles, and has excellent compatibility. . In addition, the added latex can further improve the sealing performance by forming a latex rubber at the tire perforation.

The liquid carrier in the sealant composition accounts for 80-95% by weight, and the liquid carrier is composed of water and antifreeze, wherein the water content is 10-60% by weight of the sealant composition, and the liquid medium is used. The suspension of the gel material and the rigid particles derived from the water-soluble polymer is also used to dissolve various selectively added additives. Antifreeze agents such as ethylene glycol, propylene glycol, and glycerin added to the liquid carrier are intended to broaden the applicable temperature range of the sealant composition. An antifreeze or a mixture of various antifreeze agents as described above may be used in the present invention to lower the freezing point of the liquid carrier. In a preferred embodiment, the antifreeze comprises from 5 to 70% by weight of the ethylene glycol in the sealant composition, and the weight percentage in the sealant composition is 5- 70% of the propylene glycol, and at least one of the 5% by weight of the glycerin in the sealant composition composition. In a preferred embodiment, the antifreeze is formulated using at least one of ethylene glycol, glycerin, 1,2-propanediol, and 1,3-propanediol, and the freezing point of the sealant composition can be lowered to -40 ° C (preferred embodiment) 3) The sealant composition is used at an effective temperature ranging from -40 ° C to 80 ° C. It is also possible to use an inorganic salt such as calcium chloride or magnesium chloride in an amount of from 1 to 10% by weight in the sealant composition to control the effective application temperature of the sealant composition.

The surfactant may be present in the sealant composition in an amount of from 0.1% to 5% by weight, and at least one surfactant (including anionic, cationic and nonionic surfactants) may be suitably added to improve the stability of the sealant composition. And functionality, the type of surfactant used is determined by the type of latex added to the sealant composition. In a preferred embodiment, the surfactant may be at least one selected from the group consisting of Tween 20 to Tween 85, SDS, and a surfactant such as cetyl trimethylammonium bromide.

Other additives having a weight percentage of 0.1 to 1% may be selectively added to the sealant composition depending on the specific functional requirements without affecting the sealing function of the sealant composition. The addition of a tackifier can increase the adhesion of the rigid and flexible suspended particles to the perforated wall while controlling the viscosity of the solution. The addition of a preservative can extend the shelf life of the sealant composition, and an anti-corrosion agent can also be added to prevent rust. The addition of zinc oxide or titanium oxide prevents the sealant composition from decomposing upon exposure to sunlight. Other additives such as fragrances and colorants can be selectively added as appropriate without affecting the sealing function of the sealant composition.

The sealant composition comprises from 0.1% to 1% by weight of a preservative to prevent degradation of the ingredients in the sealant composition formulation, extending the shelf life of the sealant composition to 5 years or even longer; and including 0% by weight 0.5% defoamer to avoid foaming. In addition, an anti-corrosion additive having a weight percentage of 0.1 to 1% is added to prevent rusting of the sealant composition in the tire without affecting the sealing performance.

The sealant composition prepared according to the foregoing has a viscosity of between 19.3 and 5000 mPas and a pH between 7 and 11, preferably between 8 and 10. Due to the presence of gel materials and bentonite, the precipitation of the sealant composition within 24 hours is negligible, and the use of low density rigid particles such as hollow microspheres can also solve the settling problem.

A specific method of using the sealant composition prepared according to the above components and methods: the sealant composition is injected into the tire through a hose under high pressure (preferably 3-7 bar), and whether the spool is removed does not affect the use. When there are no perforations in the tire, the sealant composition remains in a mixed state in the rotating tire without any significant physical and chemical changes. In addition, the sealant composition can be effectively spread out in the tire, so that even if the perforation occurs in the shoulder region, it can be effectively sealed.

Sealant composition performance test method: at least 300 ml of the prepared sealant composition is injected into a 165/60 R14 aged tire through a hose under high pressure (preferably 3-7 bar), and the valve can be removed or not removed during the injection process. core. It is worth noting that the volume of the injected sealant composition can be less than 300 ml in practical applications, but in this test, 300 ml was used as a test basis. In the actual test, a conventional spike with a diameter of 6.35 mm was used to pierce the tire before or during the rotation of the tire. Other sizes of perforations were also tested but now tested with a 6.35 mm diameter perforation.

The test tires were mounted on a vehicle, the tire sealant composition was injected into the tires, and then driven within 20 km. The air inside the tire leaks through the perforation, and the sealing performance of the sealant composition can be recorded by measuring the inner tube pressure every 3 to 5 km. The pressure loss measured by this test was less than 0.1 bar, and the data indicates that the sealant composition can successfully and instantly seal the tire perforations. After the test tire was removed, the perforation position was turned up, and the pressure drop remained stable, that is, the sealant composition was still stably sealed. After 24 or 48 hours, the pressure loss was measured again to determine its sealing performance.

Specific embodiment:

Some specific embodiments of the present invention will be given and related analysis will be made based on the above detailed description, but the present invention is not limited to these embodiments, and the "good" and "sealing ability" described below refer to more than 90% success. "General" refers to more than 50% success, and "Poor" refers to more than 90% success.

Preferred Embodiment 1: In the preparation of the sealant composition 1, each component is, based on 100 parts by weight of the final composition, respectively: 38.4 parts by weight of water, from 39.4 parts by weight of 1,2-propanediol and 11.7. An antifreeze composed of parts by weight of glycerin, a gel material obtained by converting 1.1 parts by weight of water-soluble polymer chitosan and 0.3 parts by weight of acetic acid and 1.3 parts by weight of sodium hydroxide, that is, reprecipitated chitosan, Rigid particles consisting of 0.5 parts by weight of vermiculite and 0.1 part by weight of mica, 4.5 parts by weight of solid latex, 2.3 parts by weight of surfactant, 0.2 parts by weight of preservative, 0-0.2 parts by weight of antifoaming agent and 0.2 Parts by weight of bentonite. The obtained sealant composition 1 had a freezing point of -30 ° C, a pH of 9.27, a viscosity of 29.0 mPas at 25 ± 5 ° C, a "good" straight-through ability, and a "good" sealing ability.

Preferred Embodiment 2: In the preparation of the sealant composition 2, each component is, based on 100 parts by weight of the final composition, respectively: 38.4 parts by weight of water, 51 parts by weight of 1,2-propanediol, from 1.1 a gel material obtained by weight part of water-soluble polymer chitosan and 0.3 parts by weight of acetic acid and 1.3 parts by weight of sodium hydroxide, rigid particles composed of 0.5 part by weight of vermiculite and 0.1 part by weight of mica, 4.5 parts by weight A solid latex, 2.3 parts by weight of a surfactant, 0.2 parts by weight of a preservative, 0 to 0.2 parts by weight of an antifoaming agent, and 0.2 parts by weight of bentonite. The obtained sealant composition 2 had a freezing point of -30 ° C, a pH of 9.30, a viscosity of 51.7 mPas at 25 ± 5 ° C, a straight-through ability of "good", and a sealing ability of "good".

Preferred Embodiment 3: In the preparation of the sealant composition 3, each component is, based on 100 parts by weight of the final composition, respectively: 27.4 parts by weight of water, 61 parts by weight of 1,2-propanediol, from 1.1 a gel material obtained by weight part of water-soluble polymer chitosan and 0.3 parts by weight of acetic acid and 1.3 parts by weight of sodium hydroxide, rigid particles composed of 0.5 part by weight of vermiculite and 0.1 part by weight of mica, 4.5 parts by weight A solid latex, 2.3 parts by weight of a surfactant, 0.2 parts by weight of a preservative, 0 to 0.2 parts by weight of an antifoaming agent, and 0.2 parts by weight of bentonite. The obtained sealant composition 3 had a freezing point of -40 ° C, a pH of 9.28, a viscosity of 78.5 mPas at 25 ± 5 ° C, a straight-through ability of "good", and a sealing ability of "good".

Preferred Embodiment 4: In the preparation of the sealant composition 4, each component is, based on 100 parts by weight of the final composition, respectively: 38.4 parts by weight of water, 51 parts by weight of ethylene glycol, and 1.1 parts by weight. a water-soluble polymer chitosan and 0.3 parts by weight of acetic acid and 1.3 parts by weight of a gelatin material prepared from sodium hydroxide, rigid particles composed of 0.5 parts by weight of vermiculite and 0.1 part by weight of mica, and 4.5 parts by weight of solid Latex, 2.3 parts by weight of a surfactant, 0.2 parts by weight of a preservative, 0 to 0.2 parts by weight of an antifoaming agent, and 0.2 parts by weight of bentonite. The obtained sealant composition 4 had a freezing point of -30 ° C, a pH of 9.19, a viscosity of 23.1 mPas at 25 ± 5 ° C, a straight-through ability of "good", and a sealing ability of "good".

Preferred Embodiment 5: In the preparation of the sealant composition 5, each component is: 38.5 parts by weight of water, 39.6 parts by weight of 1,2-propanediol and 5.0, respectively, based on 100 parts by weight of the final composition. An antifreeze composed of parts by weight of ethylene glycol, a gel material prepared from 1.3 parts by weight of water-soluble polymer chitosan and 0.3 parts by weight of acetic acid and 1.5 parts by weight of sodium hydroxide, and 0.5 parts by weight of vermiculite and 0.1 part by weight of rigid particles composed of mica, 4.5 parts by weight of a solid latex, 2.8 parts by weight of a surfactant, 0.2 parts by weight of a preservative, 0 to 0.2 parts by weight of an antifoaming agent, and 0.2 part by weight of bentonite. The obtained sealant composition 5 had a freezing point of -30 ° C, a pH of 9.43, a viscosity of 29.3 mPas at 25 ± 5 ° C, a "good" straight-through ability, and a "good" sealing ability.

Preferred Embodiment 6: In the preparation of the sealant composition 6, each component is, based on 100 parts by weight of the final composition, respectively: 38.4 parts by weight of water, 40 parts by weight of 1,3-propanediol and 11 parts by weight An antifreeze composed of parts by weight of glycerin, a gel material prepared from 1.1 parts by weight of water-soluble polymer chitosan and 0.3 parts by weight of acetic acid and 1.3 parts by weight of sodium hydroxide, 0.5 parts by weight of vermiculite and 0.1 weight The mica consists of rigid particles, 4.5 parts by weight of a solid latex, 2.3 parts by weight of a surfactant, 0.2 parts by weight of a preservative, 0 to 0.2 parts by weight of an antifoaming agent, and 0.2 parts by weight of bentonite. The obtained sealant composition 6 had a freezing point of -30 ° C, a pH of 9.65, a viscosity of 19.3 mPas at 25 ± 5 ° C, a straight-through ability of "good", and a sealing ability of "good".

Preferred Embodiment 7: In the preparation of the sealant composition 7, each component is, based on 100 parts by weight of the final composition, respectively: 38.4 parts by weight of water, 41.6 parts by weight of 1,2-propanediol and 10.4. An antifreeze composed of parts by weight of 1,3-propanediol, a gel material prepared from 1.1 parts by weight of water-soluble polymer chitosan and 0.3 parts by weight of acetic acid and 1.3 parts by weight of sodium hydroxide, and 0.5 parts by weight Vermiculite and 0.1 parts by weight of rigid particles composed of mica, 4.5 parts by weight of a solid latex, 2.3 parts by weight of a surfactant, 0.2 parts by weight of a preservative, 0 to 0.2 parts by weight of an antifoaming agent, and 0.2 parts by weight of bentonite. The obtained sealant composition 7 had a freezing point of -30 ° C, a pH of 9.32, a viscosity of 26.2 mPas at 25 ± 5 ° C, a "good" straight-through ability, and a "good" sealing ability.

The above seven preferred examples 1-7 were comparatively analyzed. In each of the examples, the components and contents of the antifreeze added were greatly changed, and the contents of the other components were slightly changed. The antifreeze agents in each of the examples are each selected from at least one of ethylene glycol, 1,2 propylene glycol, 1,3 propylene glycol, and glycerin: wherein ethylene glycol accounts for 5 to 70 parts of the 100 parts by weight of the sealant composition, Both 1,2 propylene glycol and 1,3 propylene glycol belong to propylene glycol and propylene glycol accounts for 5 to 70 parts in 100 parts by weight of the sealant composition, and glycerin accounts for 5 to 60 parts by weight of 100 parts by weight of the sealant composition. In Example 3, the liquid carrier was composed of 27.4 parts by weight of water and 61 parts by weight of 1,2-propanediol, and the other components were identical to those of Example 2, but the sealant composition 3 obtained in Example 3 was The freezing point is extended to -40 ° C, the viscosity is increased to 78.5 mPas, and still has excellent sealing ability and straight-through capability.

Preferred Embodiment 8: In the preparation of the sealant composition 8, the components are respectively: 37 parts by weight of water, 39.4 parts by weight of propylene glycol and 11.7 parts by weight of glycerin, based on 100 parts by weight of the final composition. a composition of antifreeze, a gel material prepared from 1.1 parts by weight of water-soluble polymer chitosan and 0.3 parts by weight of acetic acid and 1.3 parts by weight of sodium hydroxide, composed of 0.5 parts by weight of vermiculite and 0.1 part by weight of mica The rigid particles, 2.2 parts by weight of the solid latex, 2.3 parts by weight of the surfactant, 0.2 parts by weight of the preservative, 0 to 0.2 parts by weight of the antifoaming agent, and 0.2 parts by weight of the bentonite. The obtained sealant composition 8 had a freezing point of -30 ° C, a pH of 9.08, a viscosity of 35.6 mPas at 25 ± 5 ° C, a "good" straight-through ability, and a "good" sealing ability.

Preferred Embodiment 9: In the preparation of the sealant composition 9, each component is, based on 100 parts by weight of the final composition, respectively: 38.4 parts by weight of water, 39.4 parts by weight of propylene glycol and 11.7 parts by weight of glycerin. a composition of antifreeze, a gel material prepared from 1.1 parts by weight of water-soluble polymer chitosan and 0.3 parts by weight of acetic acid and 1.3 parts by weight of sodium hydroxide, composed of 0.5 parts by weight of vermiculite and 0.1 part by weight of mica The rigid particles, 4.5 parts by weight of the solid latex, 2.3 parts by weight of the surfactant, 0.2 parts by weight of the preservative, 0 to 0.2 parts by weight of the antifoaming agent, and 0.2 parts by weight of the bentonite. The obtained sealant composition 9 had a freezing point of -30 ° C, a pH of 9.27, a viscosity of 29 mPas at 25 ± 5 ° C, a "good" straight-through ability, and a "good" sealing ability.

Preferred Embodiment 10: In the preparation of the sealant composition 10, each component is, according to 100 parts by weight of the final composition, respectively: 34.3 parts by weight of water, 39.2 parts by weight of propylene glycol and 11.6 parts by weight of glycerin. a composition of antifreeze, a gel material prepared from 1.1 parts by weight of water-soluble polymer chitosan and 0.3 parts by weight of acetic acid and 1.3 parts by weight of sodium hydroxide, composed of 0.5 parts by weight of vermiculite and 0.1 part by weight of mica The rigid particles, 8.9 parts by weight of the solid latex, 2.3 parts by weight of the surfactant, 0.2 parts by weight of the preservative, 0 to 0.2 parts by weight of the antifoaming agent, and 0.2 parts by weight of the bentonite. The obtained sealant composition 10 had a freezing point of -30 ° C, a pH of 9.61, a viscosity of 52.7 mPas at 25 ± 5 ° C, a "good" straight-through ability, and a "good" sealing ability.

Comparative Analysis Preferred Embodiments 8-10, except that the content of the added solid latex was greatly changed in each example, and the other components and their contents were substantially the same. The content of the solid latex in the preferred embodiment 8 is 2.2 parts by weight, the corresponding viscosity is 35.6 mPas; in the preferred embodiment 9, 4.5 parts by weight, the corresponding viscosity is 29 mPas; in the preferred embodiment 10, 8.9 parts by weight, The corresponding viscosity is 52.7 mPas. The sealant compositions prepared in these three examples were excellent in straight-through properties and sealing properties.

Preferred Embodiment 11: In the preparation of the sealant composition 11, each component is, according to 100 parts by weight of the final composition, respectively: 38.3 parts by weight of water, 43.2 parts by weight of propylene glycol and 5.7 parts by weight of B An antifreeze composed of a diol, a gel material prepared from 1.4 parts by weight of a water-soluble polymer chitosan and 0.4 parts by weight of acetic acid and 1.6 parts by weight of sodium hydroxide, 0.6 parts by weight of vermiculite and 0.1 parts by weight The mica consists of rigid particles, 5.5 parts by weight of a solid latex, 2.8 parts by weight of a surfactant, 0.2 parts by weight of a preservative, 0 to 0.2 parts by weight of an antifoaming agent, and 0.2 parts by weight of bentonite. The obtained sealant composition 11 had a freezing point of -30 ° C, a pH of 9.01, a viscosity of 28.3 mPas at 25 ± 5 ° C, a "good" straight-through ability, and a "good" sealing ability.

Preferred Embodiment 12: In the preparation of the sealant composition 12, each component is, according to 100 parts by weight of the final composition, respectively: 38.1 parts by weight of water, 43 parts by weight of propylene glycol and 5.7 parts by weight of B. An antifreeze composed of a diol, a gel material prepared from 1.4 parts by weight of a water-soluble polymer chitosan and 0.4 parts by weight of acetic acid and 1.6 parts by weight of sodium hydroxide, 0.6 parts by weight of vermiculite and 0.1 parts by weight Mica and rigid particles composed of 0.6 parts by weight of hollow microbeads, 5.4 parts by weight of solid latex, 2.8 parts by weight of surfactant, 0.2 parts by weight of preservative, 0-0.2 parts by weight of antifoaming agent and 0.2 parts by weight Bentonite. The obtained sealant composition 12 had a freezing point of -30 ° C, a pH of 8.97, a viscosity of 27.1 mPas at 25 ± 5 ° C, a "good" straight-through ability, and a "good" sealing ability.

Preferred Embodiment 13: In the preparation of the sealant composition 13, each component is, based on 100 parts by weight of the final composition, respectively: 37.9 parts by weight of water, 42.7 parts by weight of propylene glycol, and 5.6 parts by weight of B. An antifreeze composed of a diol, a gel material prepared from 1.3 parts by weight of a water-soluble polymer chitosan and 0.4 parts by weight of acetic acid and 1.6 parts by weight of sodium hydroxide, 0.6 parts by weight of vermiculite and 0.1 parts by weight Mica and 1.2 parts by weight of rigid beads composed of hollow microspheres, 5.4 parts by weight of solid latex, 2.8 parts by weight of surfactant, 0.2 parts by weight of preservative, 0-0.2 parts by weight of antifoaming agent and 0.2 parts by weight Bentonite. The obtained sealant composition 13 had a freezing point of -30 ° C, a pH of 8.90, a viscosity of 31.1 mPas at 25 ± 5 ° C, a "good" straight-through ability, and a "good" sealing ability.

Preferred Embodiment 14: In the preparation of the sealant composition 14, each component is, according to 100 parts by weight of the final composition, respectively: 38.1 parts by weight of water, 43.0 parts by weight of propylene glycol and 5.7 parts by weight of B. An antifreeze composed of a diol, a gel material prepared from 1.4 parts by weight of a water-soluble polymer chitosan and 0.4 parts by weight of acetic acid and 1.6 parts by weight of sodium hydroxide, 0.6 parts by weight of vermiculite and 0.1 parts by weight Mica and 0.6 parts by weight of rigid particles composed of rubber powder, 5.4 parts by weight of solid latex, 2.8 parts by weight of surfactant, 0.2 parts by weight of preservative, 0-0.2 parts by weight of antifoaming agent and 0.2 parts by weight of bentonite . The obtained sealant composition 14 had a freezing point of -30 ° C, a pH of 8.97, a viscosity of 27.1 mPas at 25 ± 5 ° C, a "good" straight-through ability, and a "good" sealing ability.

Comparative Analysis Preferred Examples 11-14, except that the components and contents of the added rigid particles were greatly changed in each example, the other components and their contents were substantially the same. In the present invention, the rigid particles account for 0.1 to 5 parts by weight of the sealant composition, and solid particles having a size of between 0.05 μm and 320 μm can be used. In the preferred embodiment 11 enumerated above, the rigid particles are composed of 0.6 parts by weight of vermiculite and 0.1 parts by weight of mica; in the preferred embodiment 12, the rigid particles are increased by 0.6 parts by weight of the hollow microbeads; in the preferred embodiment 13 The rigid particles are composed of 0.6 parts by weight of vermiculite and 0.1 parts by weight of mica and 1.2 parts by weight of hollow microbeads; in a preferred embodiment 13, the rigid particles are composed of 0.6 parts by weight of vermiculite and 0.1 parts by weight of mica and 0.6 weight. The composition of the rubber powder. The sealant compositions prepared in these four preferred embodiments are excellent in both through and sealing properties.

Example 15: In the preparation of the sealant composition 15, the components were respectively 60 parts by weight of water, 30 parts by weight of 1,3-propanediol and 5 parts by weight based on 100 parts by weight of the final composition. An antifreeze composed of glycerin, a gel material prepared from 0.1 parts by weight of water-soluble polymer chitosan and 0.2 parts by weight of acetic acid and 0.7 parts by weight of sodium hydroxide, 0.1 part by weight of mica as rigid particles, 3 Parts by weight of the solid latex, 0.7 parts by weight of the surfactant, 0.05 parts by weight of the preservative, 0.1 part by weight of the antifoaming agent, and 0.05 part by weight of the bentonite. The obtained sealant composition 15 had a pH of 8 and a viscosity of 120 mPas at 25 ± 5 ° C. The through-pass ability was "good" and the sealing ability was "good".

Example 16: In the preparation of the sealant composition 16, each component is, based on 100 parts by weight of the final composition, 10 parts by weight of water, 70 parts by weight of 1,2-propanediol, and 6.9 parts by weight. a water-soluble polymer chitosan and 1 part by weight of acetic acid and 2.2 parts by weight of a gelatin material prepared from sodium hydroxide, rigid particles composed of 2.5 parts by weight of vermiculite and 2.5 parts by weight of mica, 1 part by weight A solid latex, 0.1 part by weight of a surfactant, 1 part by weight of a preservative, and 2.8 parts by weight of bentonite. The obtained sealant composition 16 had a pH of 10, a viscosity of 4,989 mPas at 25 ± 5 ° C, a "good" straight-through ability, and a "good" sealing ability.

Example 17: In the preparation of the sealant composition 17, the components were respectively: 16.2 parts by weight of water, 5 parts by weight of 1,3-propanediol and 60 parts by weight based on 100 parts by weight of the final composition. An antifreeze composed of glycerin, a gel material prepared from 1 part by weight of a water-soluble polymer chitosan and 0.5 parts by weight of acetic acid and 0.9 parts by weight of sodium hydroxide, 0.1 parts by weight of vermiculite and 0.5 parts by weight The mica consists of rigid particles, 10 parts by weight of a solid latex, 5 parts by weight of a surfactant, 0.6 parts by weight of a preservative, and 0.2 parts by weight of bentonite. The obtained sealant composition 17 had a pH of 9.2, a viscosity of 890 mPas at 25 ± 5 ° C, a "good" straight-through ability, and a "good" sealing ability.

Example 18: In the preparation of the sealant composition 18, each component is, based on 100 parts by weight of the final composition, 10 parts by weight of water, 70 parts by weight of ethylene glycol, and 10 parts by weight, respectively. a gelatinous material prepared by water-soluble polymer chitosan and 1.4 parts by weight of acetic acid and 2.4 parts by weight of sodium hydroxide, rigid particles composed of 2.5 parts by weight of vermiculite and 2.5 parts by weight of mica, and 1 part by weight of solid latex 0.1 parts by weight of a surfactant, 0.05 parts by weight of a preservative, and 0.05 parts by weight of an antifoaming agent. The obtained sealant composition 18 had a pH of 10, a viscosity of 5,000 mPas at 25 ± 5 ° C, a "good" straight-through ability, and a "good" sealing ability.

Comparative Analysis Examples 15-18, each of which included the case where some of the components of the sealant composition were of the end value. In Example 15, the liquid carrier was 95 parts by weight, wherein the content of water was 60 parts by weight, the glycerin content was 5 parts by weight, the content of the water-soluble polymer was 0.1 part by weight, the content of the rigid particles was 0.1 part by weight, and bentonite. The content was 0.05 parts by weight; the sealant composition 15 obtained had a pH of 8. In the embodiment 16, the liquid carrier is 80 parts by weight, wherein the content of water is 10 parts by weight, the content of propylene glycol is 70 parts by weight; the content of the rigid particles is 5 parts by weight, the content of the solid latex is 1 part by weight, and the surface activity is The content of the agent was 0.1 part by weight, and the content of the additive was 1 part by weight; the sealant composition 16 obtained had a pH of 10. In Example 17, the antifreeze was composed of 5 parts by weight of 1,3-propanediol and 60 parts by weight of glycerin, the content of the solid latex was 10 parts by weight, and the surfactant content was 5 parts by weight. In Example 18, the antifreeze was 70 parts by weight of ethylene glycol, the content of the water-soluble polymer was 10 parts by weight, and the content of the additive was 0.1 parts by weight; and the obtained sealant composition 18 at 25 ± 5 ° C The viscosity is 5000 mPas. The sealant compositions 15-18 produced in Examples 15-18 still retained good through and sealing capabilities.

no

Claims (10)

A sealant composition for repairing perforations in a tire, characterized in that the sealant composition comprises from 80% to 95% by weight of a liquid carrier, from 0.1% to 10% by weight of a water-soluble polymer. The gel material, 1-10% by weight of latex, 0.1% to 5% by weight of rigid particles as filler and 0.1% to 5% by weight of surfactant. The sealant composition of claim 1, wherein the liquid carrier comprises water and an antifreeze; and the antifreeze comprises at least one of ethylene glycol, propylene glycol, and glycerin. The sealant composition according to claim 2, wherein the ethylene glycol accounts for 5 to 70% by weight of the sealant composition, and propylene glycol is contained in the sealant composition. The percentage by weight is from 5 to 70%, and the percentage by weight of glycerin in the sealant composition is from 5 to 60%. The sealant composition of claim 1, wherein the water soluble polymer comprises a naturally derived water soluble polymer and/or a synthetic water soluble polymer. The sealant composition according to claim 1, wherein the rigid particles account for 1-3% by weight of the sealant composition, and the particle size is in the range of 0.05 to 320 μm. The sealant composition according to claim 1, wherein the sealant composition further comprises 0.1% to 1% by weight of an additive comprising an antifoaming agent, a preservative, an anticorrosive agent, and a colorant. And at least one of the fragrances. The sealant composition of claim 1, wherein the sealant composition further comprises from 0.05 to 3% by weight of bentonite. The sealant composition according to claim 1, wherein the sealant composition has a viscosity in the range of 19.3 - 5000 mPas, a pH in the range of 8 - 10 , and a sealing function effective in a temperature range of -40 ° C to Between 80 ° C. A method for preparing a sealant composition for repairing perforations in a tire, characterized in that the preparation method comprises the following steps with respect to 100 parts by weight of the sealant composition:
a. converting from 0.1 to 10 parts by weight of the water-soluble polymer into a derivatized gel material in 80 to 95 parts by weight of the liquid carrier;
b. adding 0.1-5 parts by weight of rigid particles and 1-10 parts by weight of latex in the gel suspension obtained in step a and thoroughly mixing;
c. 0.1-5 parts by weight of a surfactant is added to the composition obtained in step b. The method for preparing a sealant composition according to claim 9, wherein when the water-soluble polymer in the step a is selected from chitosan, the sealant composition is used in comparison with 100 parts by weight of the sealant composition. The method for converting a water-soluble polymer into a derivatized gel material comprises the following steps:
a. adding 0.1-10 parts by weight of chitosan to 10-60 parts by weight of water;
b. adding an appropriate amount of acid to the solution obtained in step a, adjusting the pH of the solution to a range of 0-5;
c. After the chitosan is completely dissolved, the derivatized gel material can be obtained by adding an appropriate amount of hydrazine and raising the pH of the solution to a range of 8-10.