阅读说明：本技术 刺孔密封剂和刺孔修复体系 (Puncture sealing agent and puncture repair system ) 是由 真木贵史 迈克尔·M·凯格勒 安格尔·J·希门尼斯 阿诺德·埃克哈特 于 2019-08-05 设计创作，主要内容包括：本发明公开了刺孔密封剂,其包含天然橡胶胶乳、黏合剂的水溶液和防冻剂。所述黏合剂为碳水化合物,并且以刺孔密封剂的总重量为基准计,所述刺孔密封剂包含含量在21wt％以下的由天然橡胶胶乳产生的固形物。(The invention discloses a puncture sealing agent, which comprises natural rubber latex, an aqueous solution of an adhesive and an antifreezing agent. The binder is a carbohydrate and the puncture sealing agent contains solids derived from natural rubber latex in an amount of 21 wt% or less based on the total weight of the puncture sealing agent.)

1. a puncture sealing agent comprising:

natural rubber latex, aqueous solution of adhesive and antifreezing agent,

it is characterized in that the preparation method is characterized in that,

the binding agent is carbohydrate, and the binding agent is a carbohydrate,

the puncture sealing agent contains a solid content derived from natural rubber latex of 21 wt% or less based on the total weight of the puncture sealing agent.

2. The puncture sealing agent of claim 1,

wherein the solid content derived from the natural rubber latex is 19 wt% or less, preferably 17 wt% or less, based on the total weight of the puncture sealing agent.

3. The puncture sealing agent according to claim 1 or 2,

wherein the solid content derived from the natural rubber latex is 9 wt% or more, preferably 11 wt% or more, more preferably 12 wt% or more, and still more preferably 14 wt% or more, based on the total weight of the puncture sealing agent.

4. A puncture sealing agent according to any of the preceding claims,

wherein the puncture sealing agent contains an antifreeze agent in an amount of 30 wt% or more based on the total weight of the puncture sealing agent.

5. A puncture sealing agent according to any of the preceding claims,

wherein the antifreezing agent is at least one of glycerol, propylene glycol, ethylene glycol or propane-1, 3-diol, preferably only one of glycerol, propylene glycol, ethylene glycol or propane-1, 3-diol.

6. A puncture sealing agent according to any of the preceding claims,

wherein the natural rubber latex, the aqueous solution of the binder and the anti-freezing agent are natural components.

7. The puncture sealing agent of claim 5,

wherein the puncture sealing agent has a combined content of all natural components of 90 wt.% or more, based on the total weight of the puncture sealing agent.

8. A puncture sealing agent according to any of the preceding claims,

wherein the puncture sealing agent comprises 10-30 wt% of an aqueous solution of a binder, based on the total weight of the puncture sealing agent.

9. A puncture sealing agent according to any of the preceding claims,

wherein the amount of carbohydrate in the puncture sealing agent is 1.0 wt% or more, preferably 4.4 wt% or more, preferably 5.0 wt% or more, more preferably 5.5 wt% or more, and most preferably 6.0 wt% or more, based on the total weight of the puncture sealing agent.

10. A puncture sealing agent according to any of the preceding claims,

wherein the mass Z of dissolved carbohydrates in the aqueous solution of the binder_aMass to solvent Z_bMass ratio of (Z)_a：Z_bAt 90: 10-50: 50, or less.

11. A puncture sealing agent according to any of the preceding claims,

wherein the puncture sealing agent comprises, based on the total weight of the puncture sealing agent: 9 to 19 wt% of solid matter derived from natural rubber latex, 10 to 30 wt% of an aqueous solution of a binder, and 30 wt% or more of an antifreeze.

12. A puncture sealing agent according to any of the preceding claims,

wherein the carbohydrate is selected from the group consisting of sugar, starch and degraded starch and mixtures thereof, preferably from the group consisting of sugar and degraded starch and mixtures thereof, more preferably the carbohydrate is sucrose, glucose, fructose or mixtures thereof.

13. A puncture sealing agent according to any of the preceding claims,

wherein the puncture sealing agent comprises a surfactant in an amount of 0.5 wt% or less based on the total weight of the puncture sealing agent.

14. A puncture sealing agent according to any of the preceding claims,

wherein the solid content in the natural rubber latex is 40-80 parts by mass based on 100 parts by mass of the natural rubber latex.

15. A puncture repair system comprising the puncture sealant of any of the above claims.

Technical Field

The present invention relates to a puncture sealant (puncutureating agent) for puncture repair system having excellent sealing performance.

Background

In tire puncture repair systems, puncture sealants are used to seal punctures in pneumatic tires. Puncture sealants are liquids containing solid dispersions and are injected into worn tires. The tire is then filled with air by means of a compressor and can be used for driving under this condition. While driving, the puncture sealant vibrates in the tire, with the result that solid matter (solid content) of the dispersion accumulates to cover the puncture.

In recent years, the level of performance required of puncture sealants has increased. Much effort has been devoted to improving sealant performance, injectability, and/or applicability in low temperature environments while maintaining desirable storage properties.

Puncture sealants typically contain synthetic components for improved sealing performance, injectability, and/or applicability in low temperature environments while maintaining desirable storage properties. However, the use of synthetic components is not resource-saving and environmentally friendly. In addition, there is room for improvement in the sealing performance of puncture sealants having sufficient low-temperature injection ability.

JP2015-98538A describes a puncture sealing agent in which natural rubber is contained in an amount such that the solids derived from natural rubber are 25 wt% based on the total weight of the puncture sealing agent together with a rosin resin having a softening point of 90 ℃ and propane-1, 3-diol. One other puncture sealant is described in US2015/0175862a1, which contains a rubber latex, propane-1, 3-diol and a resin emulsion (e.g., a terpene resin) as a tackifier. However, there is room for improvement in low-temperature injectability and seal retention performance.

Disclosure of Invention

In view of the above, the underlying object of the present invention is to provide a puncture sealing agent which is resource-saving, environmentally friendly, and has sealing performance, injectability, and applicability in low-temperature environments comparable to conventionally used puncture sealing agents based on synthetic components.

According to the invention, the object of the invention is solved by a puncture sealing agent as described below.

The puncture sealing agent of the present invention comprises natural rubber latex, an aqueous solution of a binder, and an antifreezing agent. The binder is a carbohydrate, and the puncture sealing agent contains a solid content of less than 21 wt% derived from natural rubber latex, based on the total weight of the puncture sealing agent.

The technical solution is based on the following unexpected findings: by combining 21 wt% or less of solids derived from natural rubber latex, based on 100 wt% of the puncture sealing agent, in the puncture sealing agent, with an aqueous solution of a carbohydrate as a binder and an antifreeze, a puncture sealing agent can be obtained which is based at least mainly on natural components and thus saves resources and is environmentally friendly. It has been found that: such puncture sealants would provide excellent sealing performance, injectability, and applicability in low temperature environments. Furthermore, by using a carbohydrate as a binder, the cost of the puncture sealing agent can be significantly reduced, since the use of synthetic resins can be reduced or completely avoided. Thus, the use of hazardous compounds and additives can be reduced or even avoided. Furthermore, disposal of the puncture sealant of the present invention after expiration is easy and not hazardous.

Another aspect of the present invention is a puncture repair system comprising the puncture sealant of the present invention.

The present invention also relates to a method for manufacturing a puncture sealing agent by mixing natural rubber latex, an aqueous solution of a binder and an anti-freezing agent, wherein the binder is a carbohydrate, and the puncture sealing agent contains solids derived from the natural rubber latex in an amount of 21 wt% or less, based on the total weight of the puncture sealing agent.

The preferred embodiments of the present invention are inventions of preferred embodiments containing additional technical features in addition to the essential technical features, and are described later together with other preferred embodiments not explicitly mentioned in the preferred embodiments.

Preferably, the solids content derived from the natural rubber latex is 19 wt% or less, preferably 17 wt% or less, based on the total weight of the puncture sealing agent.

Preferably, the solids content derived from the natural rubber latex is 9 wt% or more, preferably 11 wt% or more, more preferably 12 wt% or more, and more preferably 14 wt% or more, based on the total weight of the puncture sealing agent.

Preferably, the puncture sealing agent contains 30 wt% or more of an antifreeze agent based on the total weight of the puncture sealing agent.

Preferably, the anti-freezing agent is at least one of glycerol, propylene glycol, ethylene glycol or propane-1, 3-diol, preferably only one of glycerol, propylene glycol, ethylene glycol or propane-1, 3-diol.

Preferably, the natural rubber latex, the aqueous solution of the binder and the anti-freeze agent are natural components.

Preferably, the combined content of all natural components of the puncture sealing agent is equal to or greater than 90 wt%, based on the total weight of the puncture sealing agent.

Preferably, the puncture sealing agent comprises an aqueous solution of 10 to 30 wt% of a binder, based on the total weight of the puncture sealing agent.

Preferably, the amount of carbohydrate in the puncture sealing agent is 1.0 wt% or more, preferably 4.4 wt% or more, preferably 5.0 wt% or more, more preferably 5.5 wt% or more, most preferably 6.0 wt% or more, based on the total weight of the puncture sealing agent.

Preferably, the mass Z of dissolved carbohydrates in the aqueous solution of the binder_aMass to solvent Z_bMass ratio (Z) of_a：Z_b) At 90: 10-50: 50, or less.

Preferably, the puncture sealing agent comprises, based on the total weight of the puncture sealing agent: 9 to 19 wt% of solid matter derived from natural rubber latex, 10 to 30 wt% of an aqueous solution of a binder, and 30 wt% or more of an antifreeze.

Preferably, the carbohydrate is selected from the group consisting of sugar, starch and degraded starch and mixtures thereof, preferably from the group consisting of sugar and degraded starch and mixtures thereof, more preferably the carbohydrate is sucrose, glucose, fructose or mixtures thereof.

Preferably, the puncture sealing agent comprises a surfactant, wherein the amount of the surfactant is equal to or less than 0.5 wt% based on the total weight of the puncture sealing agent.

Preferably, the solid content in the natural rubber latex is 40 to 80 parts by mass based on 100 parts by mass of the natural rubber latex.

Detailed Description

Preferably, the puncture sealing agent contains natural rubber latex in an amount such that the solids derived from the natural rubber latex in the puncture sealing agent are 19 wt% or less, and more preferably 17 wt% or less, based on 100 wt% of the puncture sealing agent. Further, it is preferable that the puncture sealing agent contains natural rubber latex in such an amount that the solid content derived from the natural rubber latex in the puncture sealing agent is 9 wt% or more, more preferably 11 wt% or more, further preferably 12 wt% or more, and most preferably 14 wt% or more, based on 100 wt% of the puncture sealing agent. It is to be understood that the amount of solids derived from natural rubber latex in the puncture sealing agent is preferably in the range of 9 to 21 wt%, more preferably in the range of 11 to 19 wt%, further more preferably in the range of 12 to 17 wt%, and further more preferably in the range of 14 to 17 wt%, based on 100 wt% of the puncture sealing agent. However, ranges from 9 wt% to 19 wt%, 11 wt% to 21 wt%, 14 wt% to 19 wt%, as well as other ranges resulting from other combinations of the above upper and lower limits, also constitute preferred embodiments of the present invention. In the case where the natural rubber latex-derived solid is contained in the puncture sealing agent as described above, the effect of the present invention can be more obtained. In this regard, it is further preferred that in the puncture sealing agent, the total solids originating from the polymeric material other than the carbohydrate dissolved in the aqueous solution of the binder and from the polymeric surfactant are substantially equal to the solids originating from the natural rubber latex.

Preferably, the puncture sealing agent contains 40 to 80 parts by mass of a solid content in the natural rubber latex based on 100 parts by mass of the natural rubber latex, more preferably, the solid content in the natural rubber latex is in the range of 50 to 70 parts by mass, and still more preferably, 55 to 60 parts by mass. When the solid content is in the range of 40 to 80 parts by mass, a good balance between the sealant properties and the storage properties can be obtained.

Preferably, the amount of the natural rubber latex is 15 wt% or more, more preferably 18 wt% or more, and further more preferably 20 wt% or more, based on 100 wt% of the puncture sealing agent. If the puncture sealing agent contains less than 15 wt% of natural rubber latex, there is a risk that: inadequate or too slow sealing of puncture holes in tires, and sealant performance deteriorates. Further, the amount of the natural rubber latex is preferably 35 wt% or less, more preferably 32 wt% or less, more preferably 29 wt% or less, and still more preferably 28 wt% or less based on 100 wt% of the puncture sealing agent. At an amount of the natural rubber latex of less than 35 wt%, better injectability and storage properties and applicability in low-temperature environments can be obtained. It is to be understood that the amount of the natural rubber latex in the puncture sealing agent is preferably in the range of 15 to 35 wt%, more preferably in the range of 18 to 32 wt%, further more preferably in the range of 20 to 29 wt%, and further more preferably in the range of 20 to 27 wt%, based on 100 wt% of the puncture sealing agent. However, ranges from 15 wt% to 27 wt%, 20 wt% to 32 wt%, 18 wt% to 27 wt%, as well as other ranges resulting from other combinations of the above upper and lower limits, also constitute preferred embodiments of the present invention.

When the amount of the natural rubber latex is within the range, the above-mentioned effects can be advantageously obtained.

The natural rubber used in the present invention is not particularly limited, and a conventional natural rubber latex can be used. Specific examples of the natural rubber latex include: natural rubber latex obtained by tapping from Havea brasiliensis, and so-called "deproteinized natural rubber latex", which is a natural rubber latex free of proteins.

In the puncture sealing agent of the present invention, the puncture sealing agent preferably contains the antifreeze in an amount of 30 wt% or more, more preferably 33 wt% or more, further preferably 35 wt% or more, and most preferably 40 wt% or more, based on the total weight (i.e., 100 wt%) of the puncture sealing agent.

Preferably, the anti-freezing agent is at least one of glycerol, propylene glycol, ethylene glycol or propane-1, 3-diol. These may be used in the form of a mixture. However, it is further more preferred that the puncture sealing agent comprises only one of glycerol, propylene glycol, ethylene glycol or propane-1, 3-diol as the antifreeze agent, most preferably the antifreeze agent consists of one of glycerol, propylene glycol, ethylene glycol or propane-1, 3-diol in the amounts as described above.

From the ecological point of view, it is preferable that, in the puncture sealing agent, the natural rubber latex, the aqueous solution of the binder, and the antifreezing agent are natural components. In this regard, it is even more preferred that the combined content of all natural components in the puncture sealing agent is equal to or greater than 90 wt%, based on the total weight of the puncture sealing agent. Most preferably, the puncture sealing agent does not contain any synthetic resin. The low or preferably non-presence of synthetic resin in the puncture sealing agent results in a resource-saving and environmentally friendly puncture sealing agent which is easy to handle after expiry. Furthermore, it was found that: with the puncture sealing agent containing no synthetic resin, excellent low-temperature characteristics and excellent seal retention can be obtained. In the context of this application, the term "natural component" refers to compounds and derivatives of such compounds that may be found in nature and are not petroleum derived (i.e., compounds that may be found in nature but have been modified, for example, by chemical reaction). Typically, the synthetic resin is a petroleum derived resin.

Regarding the adhesive, it is preferable that the puncture sealing agent comprises an aqueous solution of 10 to 30 wt% of the adhesive, based on the total weight of the puncture sealing agent. An aqueous solution of the binder in such a content provides the puncture sealing agent with good injectability and sealing performance.

In this connection, it is furthermore preferred that the mass of carbohydrates (Z) in the aqueous solution of the binder_a) Mass to solvent (Z)_b) Mass ratio (Z) of_a：Z_b) At 90: 10-50: 50, preferably in the range of 80: 20-55: 45, more preferably in the range of 80: 20-55: 40 ofWithin the range, still more preferably 70: 30-60: 40, in the range of. If the ratio is greater than 90: 10, the following risks exist: the viscosity of the aqueous solution of the binder increases and the injection ability deteriorates. However, if the ratio is less than 50: 50, the time for sealing the puncture hole may increase and the sealing performance may deteriorate.

Preferably, the amount of carbohydrate in the puncture sealing agent is 1.0 wt% or more, preferably 4.4 wt% or more, more preferably 5.0 wt% or more, further preferably 5.5 wt% or more, and most preferably 6.0 wt% or more, based on 100 wt% of the puncture sealing agent.

In the puncture sealing agent, the carbohydrate is preferably monosaccharide, oligosaccharide, polysaccharide or a mixture thereof, the oligosaccharide is disaccharide to decaose, preferably disaccharide to pentaose, preferably the carbohydrate is selected from sugar, starch, degraded starch and a mixture thereof, more preferably from sugar and degraded starch according to a more preferred embodiment of the invention, the carbohydrate is monosaccharide, oligosaccharide or a mixture thereof, the monosaccharide can be triose, tetrose, pentose, hexose, heptose or a mixture thereof, wherein hexose, pentose and a mixture thereof are particularly preferred.

As binders, preference is given to using hydrolysates of starch, such as glucose syrup and/or glucose-fructose syrup or dextrin, since the cost of the puncture sealing agent is reduced when these binders are used. Dextrins, glucose syrups and glucose-fructose syrups are liquid starch hydrolysates containing mono-, di-and oligosaccharides and can be prepared from any source of starch, for example from wheat, tapioca and potato. Most preferably, the carbohydrate used as a binder is sucrose, glucose, fructose or a mixture of two or more of these. In terms of storage stability, sucrose is particularly preferably used.

In the puncture sealing agent of the present invention, the carbohydrate is contained in the form of an aqueous solution, that is, the carbohydrate is dissolved. In order to prevent the carbohydrate from precipitating in the puncture sealing agent, the carbohydrate preferably has a water solubility of 100g/L or more, more preferably 300g/L or more at 20 ℃.

Highly preferably, the puncture sealing agent of the present invention comprises at least one of sucrose, glucose, fructose and a mixture of two or more of these carbohydrates. Most preferably, the carbohydrate is sucrose.

Preferably, the puncture sealing agent comprises a surfactant, particularly preferably in an amount of 0.5 wt.% or less, more preferably 0.3 wt.% or less, based on the total weight of the puncture sealing agent. The surfactant improves the storage stability of the puncture sealant because it prevents undesirable agglomeration of rubber particles during storage. If more than 0.5 wt% of surfactant is used, the following risks exist: the sealing performance is deteriorated.

It is particularly preferred that the surfactant is a natural compound, i.e. not petroleum based. Puncture sealants are resource-saving and environmentally friendly if the surfactant is a natural compound. The natural surfactant may be an anionic surfactant, an amphoteric surfactant, a cationic surfactant, a nonionic surfactant, or a mixture thereof. Most preferably, the natural surfactant comprises at least one nonionic surfactant.

Anionic surfactants have a negatively charged hydrophilic head, and examples of anionic surfactants are sodium sulfate, ammonium sulfate, sulfosuccinate, sarcosine, sarcosinate, isethionate, taurate, alkylbenzenesulfonate, alkylphosphate, and alkenylsuccinate. Amphoteric surfactants have a positive or negative charge depending on the pH of the medium. Some examples for amphoteric surfactants are coco betaines (coco betaines), lauryl betaines, hydroxysultaines, alkyl dimethyl betaines, and alkyl amide betaines. The cationic surfactant presents a positively charged head at the hydrophilic portion. Examples for cationic surfactants include: benzalkonium chloride (benzalkonium chloride), salammonium chloride (stearakonitum chloride), cetrimonium chloride (cetrimonium chloride), and trimethylammonium chloride, methyl sulfate, alkylamine acetate, and quaternary ammonium salts. Nonionic surfactants do not have an ionic charge in their hydrophilic units. Some examples for nonionic surfactants include: ethoxylate oxides, waxes, emulsifying waxes, glyceryl oleate, glyceryl stearate, pegylated compounds such as ceteareth and sorbitan alcohols, lauryl glucoside, polydextrose, polyoxyethylene alcohol ethers, polyoxyethylene fatty acid esters, polyoxyethylene alkylphenols and polyoxyethylene polyoxypropylene block polymers.

It is noted that the above-described features of the puncture sealing agent can of course be combined with each other to provide a preferred embodiment of the invention. Thus, in a preferred embodiment of the invention, the compounds described above and the numerical ranges for the compounds are independently selected and combined with each other. This results in a large number of possible embodiments which represent the invention, only a few of which are explicitly listed. The person skilled in the art knows that the subsequently mentioned preferred embodiments can be combined with each other and with the features described above.

Accordingly, a preferred exemplary embodiment of the puncture sealing agent includes 15 to 35 wt% of a natural rubber latex, 10 to 30 wt% of an aqueous solution of a binder, and 30 wt% or more of an anti-freezing agent, based on the total weight of the puncture sealing agent, wherein the natural rubber latex has a solid content of 40 to 80 parts by mass, based on 100 parts by mass of the natural rubber latex.

In another preferred exemplary embodiment, the binder is selected from sucrose, glucose, fructose and mixtures of two or more of these carbohydrates, and the antifreeze agent is selected from at least one of glycerol, propylene glycol, ethylene glycol or propane-1, 3-diol and mixtures thereof.

According to another preferred exemplary embodiment, the puncture sealing agent comprises a surfactant, and the natural rubber latex is in an amount such that solids derived from the natural rubber latex in the puncture sealing agent are 21 wt% or less, based on 100 wt% of the puncture sealing agent.

According to another preferred exemplary embodiment, the amount of the natural rubber latex in the puncture sealing agent is such that solids derived from the natural rubber latex in the puncture sealing agent are 19 wt% or less based on 100 wt% of the puncture sealing agent, and further the amount of the carbohydrate is 4.4 wt% or more based on 100 wt% of the puncture sealing agent, wherein, more preferably, the carbohydrate is a monosaccharide, an oligosaccharide, a polysaccharide or a mixture thereof, and further preferably, the carbohydrate is selected from the group consisting of a sugar and a degraded starch.

In another preferred exemplary embodiment, the amount of carbohydrate in the puncture sealing agent is 6.0 wt% or more based on 100 wt% of the puncture sealing agent, the carbohydrate being an oligosaccharide, in particular a disaccharide, such as sucrose.

According to another preferred exemplary embodiment, the puncture sealing agent includes a natural rubber latex in an amount such that solids derived from the natural rubber latex in the puncture sealing agent are in a range of 9 to 19 wt% and the carbohydrate is at least one carbohydrate having a solubility in water of 100g/L or more at a temperature of 20 ℃, based on 100 wt% of the puncture sealing agent.

In another preferred exemplary embodiment, the puncture sealing agent contains an antifreeze in an amount of 33 wt% or more based on 100 wt% of the puncture sealing agent, wherein the antifreeze is at least one of ethylene glycol, propylene glycol, propane-1, 3-diol, and glycerin, and wherein the carbohydrate is at least one of sucrose, fructose, and dextrin.

The puncture repair system preferably comprises: a container for storing the puncture sealing agent of the present invention, and a compressor for filling a tire with air.