JP5542366B2 - Method for producing puncture sealant - Google Patents

Description

  The present invention relates to a method for producing a puncture sealing agent that is injected into a pneumatic tire to close a puncture hole of the pneumatic tire.

  In recent years, when a pneumatic tire (hereinafter simply referred to as “tire”) is punctured, a liquid puncture sealant is injected into the tire without changing the tire and wheel, and then the internal pressure of the tire is designated. Sealing and pump-up devices that repair tire punctures by increasing the pressure up to the pressure have become widespread. As a puncture sealing agent used in this type of sealing / pump-up device, there is one produced by stirring and mixing a rubber latex, a resin emulsion, and an antifreeze liquid composed of propylene glycol. In such a process for producing a puncture sealant, generally, a rubber latex and an adhesive are mixed to prepare a mixed solution, and then an antifreeze solution is injected into the mixing container to produce a puncture sealant stock solution.

The puncture sealant is used when the tire is punctured. If the tire is not punctured, the puncture sealant is left in a car having a large temperature difference (for example, −30 ° C. to + 70 ° C.) for many years. Become. For this reason, there are concerns about solidification (gelation) and deterioration of the puncture sealing agent, particularly at high temperatures such as in summer.
As a method for producing a puncture sealing agent for the purpose of preventing the solidification of such a puncture sealing agent, for example, the method described in Patent Document 1 is known.

  The manufacturing method of the puncture sealant disclosed in Patent Document 1 is caused by the rubber latex agglomerates by mixing the rubber latex and antifreeze liquid, which are components of the puncture sealant, into multiple steps and mixing the components. This prevents the puncture sealant from gelling.

JP 2008-69253 A

  However, since the puncture sealant solidifies when exposed to air and the quality of the puncture sealant is reduced, the puncture sealant component can be mixed into the puncture sealant even if it is mixed so as not to cause gelation. When air, especially oxygen is mixed, the puncture sealant may be deteriorated due to oxidation or the like, and the life of the puncture sealant may be shortened.

  In view of the above circumstances, an object of the present invention is to provide a method for producing a puncture sealing agent that suppresses deterioration of the puncture sealing agent due to air, particularly oxygen.

As a result of intensive studies to solve the above problems, the present inventors have conceived the following present invention and found that the problems can be solved.
<1> A method for producing a puncture sealing agent, comprising a mixing step of mixing at least rubber latex, water, and an antifreeze, and performing ultrasonic irradiation during the mixing step.

  <2> The method for producing a puncture sealing agent according to an embodiment of the present invention preferably includes a filtration step of performing filtration after the mixing step in addition to the mixing step, and ultrasonic waves are also generated during the filtration step. Irradiation is preferably performed.

  <3> In the method for producing a puncture sealing agent according to an embodiment of the present invention, the mixing step includes a first mixing step of mixing rubber latex and water, and a second mixing step of mixing the antifreeze liquid and the adhesive. It is preferable to include a mixing step and a third mixing step of mixing the mixed solution that has passed through the first mixing step and the mixed solution that has passed through the second mixing step.

  <4> In the method for producing a puncture sealing agent according to the embodiment of the present invention, it is preferable that the mixing step includes a mixing step of mixing the antifreeze liquid after mixing the rubber latex, the adhesive, and water.

  <5> In the method for producing a puncture sealant according to an embodiment of the present invention, the mixing step prepares a mixed solution by mixing an antifreeze solution and water, and the mixed solution contains a rubber latex and an adhesive. It is preferable to include a mixing step of mixing the mixed solution.

  <6> In the present invention, the rubber latex is preferably at least one selected from the group consisting of SBR latex, NBR latex, MBR latex, BR latex, carboxyl-modified NBR latex, and carboxyl-modified SBR latex. .

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the puncture sealing agent which suppresses deterioration of the puncture sealing agent resulting from air can be provided.

[Ultrasonic irradiation]
The present invention is a method for producing a puncture sealant that includes a mixing step of mixing at least rubber latex, water, and an antifreeze, and performing ultrasonic irradiation during the mixing step. “Ultrasonic irradiation during the mixing step” means at least 1 during or after the mixing of components of the puncture sealant such as rubber latex, water and antifreeze (hereinafter also simply referred to as “the puncture sealant component”). This refers to performing ultrasonic irradiation once.
Suppressing deterioration of the puncture sealant produced by removing the air in the mixture and reducing the oxygen concentration by irradiating the mixture with the puncture sealant component and puncture sealant component. Can do.

  In order to remove air in the liquid, nitrogen substitution (inert gas substitution) in which an inert gas such as nitrogen gas is allowed to flow into the liquid may be performed. Depending on the nitrogen substitution, the air in the puncture sealing agent may be removed. It could not be removed sufficiently. This is because, depending on the nitrogen substitution, only a part of the puncture sealant in contact with the nitrogen gas is degassed. Among the puncture sealant components, rubber latex, adhesives, etc. are water, alcohol, etc. It is presumed that the specific gravity is heavier and more viscous than volatile organic solvents. In particular, in the gelation or agglomeration of the component generated by mixing the puncture sealant component in the production process of the puncture sealant, for example, in the gelation or agglomeration of rubber latex, bubbles that have entered the gel or the aggregate Is considered difficult to remove by nitrogen substitution.

However, if ultrasonic irradiation is performed in the manufacturing process of the puncture sealant, vibration of a large energy is imparted to the entire puncture sealant, so that it can be degassed evenly in the liquid. In gelation or aggregation, it is considered that bubbles that have entered the gel or aggregate are easily removed.
During the manufacturing process of the puncture sealant, especially in the mixing process of mixing the puncture sealant component, gelation or aggregation of the puncture sealant component is likely to occur during mixing of the puncture sealant component. It is necessary to perform ultrasonic irradiation. The ultrasonic irradiation is preferably performed during mixing rather than after mixing the puncture sealant component.

  Whether or not air has been removed from the puncture sealant component, the puncture sealant component mixture, and the puncture sealant is determined by the oxygen concentration in each of the puncture sealant component, the puncture sealant component mixture, and the puncture sealant. It can be confirmed by measuring using a dissolved oxygen meter or the like. Although it does not restrict | limit in particular as a dissolved oxygen meter, a manufacturer, a product, etc., For example, Shimadzu Corporation make and dissolved oxygen meter DO142 can be mentioned.

The ultrasonic irradiation of the puncture sealant component, the puncture sealant component mixture, and the puncture sealant is preferably performed at 20 ° C to 30 ° C. Further, the irradiation time is preferably 3 minutes or more, more preferably 5 minutes or more from the viewpoint of improving deaeration. The upper limit of the irradiation time is preferably 2 hours in order to avoid damage to the puncture sealant component.
The frequency of the ultrasonic wave is preferably 15 kHz to 50 kHz, and more preferably 20 kHz to 40 kHz.

Ultrasonic irradiation of the puncture sealant component, puncture sealant component mixture, and puncture sealant is performed by ultrasonically cleaning the container containing the puncture sealant component, puncture sealant component mixture, and puncture sealant. It can be carried out by immersing it in a vessel liquid (for example, water). Such an ultrasonic cleaner is not particularly limited by a manufacturer, a product, or the like. For example, an ultrasonic cleaner MUS-60D manufactured by Tokyo Rika Co., Ltd. can be used.
Moreover, it is also one of the preferable aspects to directly irradiate the puncture sealant component, the puncture sealant component mixture, and the puncture sealant directly without passing through the container. For example, a bar on a metal is inserted into a puncture sealant component, a puncture sealant component mixture, or a puncture sealant in a container, and ultrasonic irradiation is performed. Such an ultrasonic irradiator is not particularly limited by a manufacturer, a product, or the like. For example, an ultrasonic homogenizer VC-505 manufactured by Tokyo Rika Co., Ltd. can be used.

[Mixing process]
The mixing step in the method for producing a puncture sealant according to the embodiment of the present invention requires at least mixing of rubber latex, water, and antifreeze liquid. In particular, in order to suppress gelation and agglomeration of the rubber latex, it is preferable to mix the rubber latex, water, and antifreeze liquid in a plurality of steps.
Hereinafter, the mixing process of the puncture sealant component according to the embodiment of the present invention will be described separately for the first to third aspects.

(First aspect)
The mixing step of the puncture sealant component according to the first aspect of the present invention includes a first mixing step of mixing rubber latex and water, a second mixing step of mixing antifreeze and an adhesive, And a third mixing step of mixing the liquid mixture having undergone the first mixing step and the liquid mixture having undergone the second mixing step.

(1) First mixing step:
The first mixing step is a step of mixing rubber latex and water. The mixing mass ratio of rubber latex and water (rubber latex / water) is preferably 2.5 to 10.0. When mixing, stirring is preferably performed, and the stirring speed is preferably 50 rpm to 500 rpm.

  Here, as the rubber latex, it is preferable to use NR (natural rubber) latex or synthetic rubber latex, and it is more preferable to use synthetic rubber latex in consideration of corrosiveness to a tire or the like. As the synthetic rubber latex, it is preferable to use one or more selected from the group consisting of SBR latex, NBR latex, MBR latex, BR latex, carboxyl-modified NBR latex, and carboxyl-modified SBR latex.

(2) Second mixing step:
The second mixing step is a step of mixing the antifreeze liquid and the adhesive. The mixing mass ratio (antifreeze / adhesive) of the antifreeze and adhesive is preferably 3.5 to 8.0. When mixing, stirring is preferably performed, and the stirring speed is preferably 50 rpm to 500 rpm.

  Here, the antifreeze liquid is preferably one or more selected from the group consisting of ethylene glycol, propylene glycol, diethylene glycol and dipropylene glycol. The content of such an antifreeze is preferably 10% by mass to 60% by mass in the finally obtained puncture sealing agent. If it is less than 10% by mass, sufficient anti-freezing properties at low temperatures may not be obtained, and if it exceeds 60% by mass, the relative amount of rubber latex may decrease and sufficient sealing characteristics may not be obtained. Because there is.

  The resin emulsion as an adhesive is one or more selected from the group consisting of terpene resins, rosin resins, tall oil resins, phenol resins, petroleum resins, and modified products of these resins. Is preferred.

(3) Third mixing step:
A 3rd mixing process is a process of mixing the liquid mixture (mixed liquid (1-1)) which passed through the 1st mixing process, and the liquid mixture (mixed liquid (1-2)) which passed through the 2nd mixing process. is there.

  The mixed liquid (1-1), mixed liquid (1-2), and mixed mass ratio (mixed liquid (1-1) / mixed liquid (1-2)) are preferably set to 0.5 to 1.2. . When mixing, stirring is preferably performed, and the stirring speed is preferably 50 rpm to 500 rpm.

  In the first to third mixing steps, a dispersant, an emulsifier, a foam stabilizer, or a pH adjuster such as ammonia or caustic soda may be added as appropriate. By mixing in a predetermined combination as in the first to third mixing steps, the most important latex for expressing the sealing property is stabilized in the aqueous system (for long-term storage), so that the rubber It becomes possible to effectively prevent gelation of the puncture sealant due to latex agglomerates.

(Second aspect)
The mixing step of the puncture sealant component according to the second aspect of the present invention includes a mixing step of mixing the antifreeze liquid after mixing the rubber latex, the adhesive and water.

Specifically, this is a step of mixing the rubber latex, the pressure-sensitive adhesive, and water and then mixing the antifreeze liquid. The order of mixing the rubber latex, the pressure-sensitive adhesive, and water is not particularly limited, and these may be mixed simultaneously.
The pressure-sensitive adhesive is preferably 15 to 45 parts by mass with respect to 100 parts by mass of the rubber latex. Water is preferably 20 to 40 parts by mass. The antifreeze liquid is preferably 100 to 150 parts by mass. When mixing, stirring is preferably performed, and the stirring speed is preferably 50 rpm to 500 rpm.
The rubber latex, antifreeze and adhesive are the same as in the first embodiment.

  Moreover, when mixing each additive, it may be better to leave some intervals for mixing. For example, after mixing an adhesive with rubber latex, it is preferable to mix water after 3 to 60 minutes and then mix antifreeze after 3 to 60 minutes.

(Third aspect)
In the mixing step of the puncture sealant component according to the third aspect of the present invention, the antifreeze liquid and water are mixed to prepare a mixed liquid, and the mixed liquid is mixed with the mixed liquid of rubber latex and adhesive. Process.

  Specifically, it is a step of preparing a mixed solution by mixing an antifreeze solution and water, and mixing a mixed solution of rubber latex and an adhesive with this mixed solution. The mass ratio of antifreeze and water (antifreeze / water) is preferably 3.0 to 10.0. When mixing, stirring is preferably performed, and the stirring speed is preferably 50 rpm to 500 rpm. In addition, about the specific example of antifreeze, it is the same as that of a 1st aspect.

  Next, the mixing mass ratio of rubber latex and pressure-sensitive adhesive (rubber latex / pressure-sensitive adhesive) is preferably 2.0 to 7.0. When mixing, stirring is preferably performed, and the stirring speed is preferably 50 rpm to 500 rpm. In addition, about the specific example of rubber latex and an adhesive, it is the same as that of a 1st aspect.

-Other processes-
In the mixing step of the puncture sealant component according to the embodiment of the present invention, as described above, an acid or base for pH adjustment or a dispersant may be added during the preparation of the mixed solution. Then, after preparing each of the above mixed solutions, a step of adding an acid or a base for adjusting pH or adding a dispersant may be added.

[Filtering process]
In the method for producing a puncture sealing agent according to an embodiment of the present invention, it is preferable to have a filtration step of filtering the obtained mixed solution after the mixing step, and performing ultrasonic irradiation during the filtration step. . Here, “performing ultrasonic irradiation during the filtration step” means performing at least one ultrasonic irradiation during or after filtering the mixed liquid obtained in the mixing step.

  As a filtration method, a known method can be employed. After passing through the mixing step, gelation due to the aggregation of the rubber latex proceeds and fine particle aggregates are generated. If the agglomerates are allowed to stand, gelation will further proceed with this as a nucleus. Therefore, the particulate aggregates serving as nuclei are removed by the filtration step, and finally the gelation of the puncture sealant due to the rubber latex agglomerates is effectively prevented. As a result, the storage stability of the puncture sealing agent can also be improved.

  As a filter member of a filter used for filtration, it is preferable to use a metal mesh filter formed in a wire mesh shape. In this case, the number of meshes is preferably 50 mesh (mesh opening diameter is about 300 μm) to 400 mesh (mesh opening diameter is about 30 μm). As a material of the mesh filter, a metal material having high corrosion resistance such as stainless steel and aluminum alloy can be suitably used.

  Further, as the filter member, a porous filter having a large number of micro openings having an opening diameter substantially the same as the mesh of a mesh filter of 50 mesh to 400 mesh may be used, and a mesh filter or a porous filter may be used. A laminated filter laminated may be used.

-Other processes-
It is also a preferred aspect that the filtration step according to the embodiment of the present invention further includes an aggregate growth step.
The aggregate growth step is preferably performed prior to the filtration step. In this agglomerate growth step, the puncture sealant stock solution prepared in the mixing step is held (standing) in the container without stirring for at least 24 hours, preferably 48 hours or more. The lower limit of the standing time can be appropriately changed within a range of 24 hours to 48 hours according to the number of meshes of the mesh filter used in the filtration step.

  In addition, although the upper limit of the standing time is not particularly limited, consideration is given to the restriction of the process time (tact time) when manufacturing the puncture sealing agent, the limit of the stock amount for stocking the manufactured puncture sealing agent, etc. In addition, since the amount of water contained in the puncture sealant gradually changes due to evaporation or moisture absorption depending on the storage environment, the upper limit of the standing time is set to 480 hours or less considering the change in the amount of moisture during storage. It is preferable to set.

  In each of the above steps, a dispersant, an emulsifier, a foam stabilizer, or a pH adjuster such as ammonia or caustic soda may be added as appropriate.

[Filling the puncture sealant into the container]
The puncture sealant after passing through the manufacturing process of the puncture sealant according to the embodiment of the present invention is in a container having a capacity corresponding to an amount required for one puncture repair (for example, 200 g to 800 g). Then, the container inlet is closed with an inner lid and an outer lid, and stored in a sealed state in the container.
Since ultrasonic irradiation is performed during the manufacturing process of the puncture sealant according to the embodiment of the present invention, air contamination is already suppressed in the manufactured puncture sealant, but the container is filled. It is preferable to perform ultrasonic irradiation on the puncture sealant. This is to prevent air from being mixed into the puncture sealant during filling of the container and to remove the mixed air.

  In the container filled with the puncture sealing agent, the inner lid and the outer lid are respectively removed at the time of puncture repair to the tire, and are loaded into the sealing / pump-up device. This sealing / pump-up device, for example, pressurizes a puncture sealing agent in a container by a pump, and pumps the puncture sealing agent from the container into the tire through a joint hose connected to the tire valve of the tire.

<Ultrasonic irradiation method>
A probe of an ultrasonic homogenizer VC-505 manufactured by Tokyo Rika Co., Ltd. was placed in a mixed solution of a puncture sealant component, a filtrate, and a puncture sealant, and each was irradiated with ultrasonic waves. The ultrasonic irradiation time was the same as the mixing and stirring time of the components for the mixture of the puncture sealant components. For example, in the preparation of the mixed solution A21 of Example 2 described later, ultrasonic irradiation was continued from the start of mixing the SBR latex and rosin resin until water was added and stirring for 10 minutes was completed. Each of the filtrate and the puncture sealant was performed for 5 minutes.

<Preparation of puncture sealant>
Example 1
A mixed liquid (1-1) was prepared by mixing 40 parts by mass of SBR latex and 5 parts by mass of water while irradiating with ultrasonic waves. Further, 45 parts by mass of propylene glycol and 10 parts by mass of rosin resin were mixed while being irradiated with ultrasonic waves to prepare a mixed liquid (1-2). The liquid mixture (1-1) and the liquid mixture (1-2) were mixed with ultrasonic irradiation to prepare a liquid mixture A11. Then, it was left still for 36 hours, then filtered using a 200 mesh filter, and the obtained filtrate B1 was irradiated with ultrasonic waves. The filtrate B1 after ultrasonic irradiation was used as a puncture sealant. 500 parts by mass of the obtained puncture sealing agent was filled in a stainless steel container, and ultrasonic irradiation was performed 10 minutes after filling the stainless steel container with the puncture sealing agent.

(Example 2)
10 parts by mass of rosin resin was mixed with 40 parts by mass of SBR latex while irradiating with ultrasonic waves. After stirring for 10 minutes, 5 parts by mass of water was further mixed and stirred for 10 minutes to obtain a mixed liquid A21. Thereafter, 45 parts by mass of propylene glycol was mixed while irradiating with ultrasonic waves and stirred for 10 minutes to obtain a mixed solution A22. Then, it was left to stand for 36 hours, and then filtered using a 200 mesh filter, and the obtained filtrate B2 was irradiated with ultrasonic waves. The filtrate B2 after ultrasonic irradiation was used as a puncture sealant. 500 parts by mass of the obtained puncture sealing agent was filled in a stainless steel container, and ultrasonic irradiation was performed 10 minutes after filling the stainless steel container with the puncture sealing agent.

(Example 3)
A mixed liquid A31 was prepared by mixing 45 parts by mass of propylene glycol and 5 parts by mass of water while irradiating with ultrasonic waves. A mixed solution of 40 parts by mass of SBR latex and 10 parts by mass of rosin resin was mixed with the mixed solution 31 while irradiating with ultrasonic waves to obtain a mixed solution 32. The mixture 32 was stirred for 10 minutes and then allowed to stand for 36 hours. Next, filtration was performed using a 200-mesh filter, and the obtained filtrate B3 was irradiated with ultrasonic waves. The filtrate B3 after ultrasonic irradiation was used as a puncture sealant. 500 parts by mass of the obtained puncture sealing agent was filled in a stainless steel container, and ultrasonic irradiation was performed 10 minutes after filling the stainless steel container with the puncture sealing agent.

Example 4
In the same manner as in Example 1, a puncture sealing agent was produced, and 500 parts by mass of the obtained puncture sealing agent was filled in a stainless steel container. The stainless steel container filled with the puncture sealant was not irradiated with ultrasonic waves.

(Comparative Example 1)
A puncture sealant was produced in the same manner as in the production process of the puncture sealant of Example 1, except that ultrasonic irradiation was not performed. A stainless steel container was filled with 500 parts by mass of the obtained puncture sealing agent. Ultrasonic irradiation was not performed on the puncture sealant.

(Comparative Example 2)
After mixing 10 parts by mass of rosin resin with 40 parts by mass of SBR latex and stirring for 10 minutes, 5 parts by mass of water was further mixed and stirred for 10 minutes to obtain a mixed liquid A61. After nitrogen substitution was performed on the mixed solution A61, 45 parts by mass of propylene glycol was mixed with the mixed solution A61 after nitrogen substitution, and the mixture was stirred for 10 minutes to obtain a mixed solution A62. The mixture A62 after nitrogen substitution was allowed to stand for 36 hours, and then filtered using a 200 mesh filter to obtain a filtrate B6, which was purged with nitrogen. Filtrate B6 after nitrogen substitution was used as the puncture sealant. 500 parts by mass of the obtained puncture sealing agent was filled in a stainless steel container, and 10 minutes after filling the stainless steel container with the puncture sealing agent, the puncture sealing agent was purged with nitrogen.
The ultrasonic irradiation was not performed on the mixed solution or the puncture sealant.

-Nitrogen replacement method-
Nitrogen replacement is performed by bringing a glass tube into contact with the bottom of each container of the mixed solution A61, the container containing the mixed solution A62, the container containing the filtrate B6, and the stainless steel container, and a flow rate of 0. This was performed by flowing 6 mL / min of nitrogen gas into the liquid for 5 minutes.

<Evaluation>
1. Oxygen concentration in puncture sealant 60 minutes after filling the puncture sealant into the stainless steel container, the oxygen concentration in the puncture sealant in the stainless steel container was measured using a dissolved oxygen meter DO142 manufactured by Shimadzu Corporation. Evaluation was performed according to the following evaluation criteria. The allowable ranges are ○ and ◎.
-Evaluation criteria-
◎: punk oxygen concentration in the sealing agent is less than 2 m g / L ○: puncture sealant oxygen concentration is less than 4 m g / L or more 2 m g / L of △: oxygen concentration in the puncture sealing agent 4 m g / L or more 5 m g / L less ×: oxygen concentration in the puncture sealing agent 5 m g / L or more

2. Sealability Stainless steel containers filled with puncture sealants are stored in an oven at 80 ° C for 60 days, and the life of the puncture sealants (the period during which they function as puncture sealants) is evaluated based on the degree of deterioration of the seal performance of the puncture sealants. did. Specifically, after the puncture sealant is filled into the stainless steel container, the puncture sealant is taken out from the stainless steel container after 10 days, 20 days, 30 days, 40 days, 50 days, and 60 days, and the sealing property is evaluated. did.

  Specifically, in the tire tread groove portion of one tire, a hole of φ2.3 mm is drilled, a puncture sealing agent taken out from a stainless steel container is injected, and the puncture sealant is attached to a car, while maintaining an air pressure of 0.2 MPa. The vehicle was run at a speed of about 50 km / h, and the sealing performance was judged based on whether or not the seal was completed when the vehicle traveled 3 km. Under the above conditions, it was determined that the sealing performance was good when sealing was completed during 3 km traveling, and the sealing performance was deteriorated when sealing was not completed during 3 km traveling.

The evaluation criteria for the storage stability of the puncture sealant are as follows. The allowable ranges are ○ and ◎.
-Evaluation criteria-
◎: Good sealing performance 60 days after filling with stainless steel container ○: Good sealing performance until 50 days after filling stainless steel container, but sealing performance decreases 60 days after filling with stainless steel container △: Filling stainless steel container Until 40 days later, the sealing performance is good, but the sealing performance decreases after 50 days from filling the stainless steel container. ×: The sealing performance decreases after 40 days from filling the stainless steel container.

Claims (7)

  The manufacturing method of the puncture sealing agent which has a mixing process which mixes rubber latex, water, and an antifreeze at least, and performs ultrasonic irradiation in this mixing process.   The method for producing a puncture sealing agent according to claim 1, further comprising a filtration step of performing filtration after the mixing step, and performing ultrasonic irradiation during the filtration step. The mixing step is
A first mixing step of mixing rubber latex and water;
A second mixing step of mixing the antifreeze and the adhesive;
The manufacturing method of the puncture sealing agent of Claim 1 or Claim 2 including the 3rd mixing process which mixes the liquid mixture which passed through the said 1st mixing process, and the liquid mixture which passed through the said 2nd mixing process.   The method for producing a puncture sealing agent according to claim 1 or 2, wherein the mixing step includes a mixing step of mixing an antifreeze after mixing a rubber latex, an adhesive, and water.   3. The mixing process according to claim 1, wherein the mixing step includes a mixing step in which an antifreeze solution and water are mixed to prepare a mixed solution, and a mixed solution of rubber latex and an adhesive is mixed with the mixed solution. A method for producing a puncture sealant.   The rubber latex is at least one selected from the group consisting of SBR latex, NBR latex, MBR latex, BR latex, carboxyl-modified NBR latex, and carboxyl-modified SBR latex. The manufacturing method of the puncture sealing agent as described in a term. A puncture sealing agent containing at least rubber latex, water, and antifreeze, and having a dissolved oxygen concentration of less than 2 mg / L.