JP5496753B2 - Cement-based aerosol products - Google Patents

Description

  The present invention relates to a cement-based aerosol product used for repairing or surface beautifying concrete or cement mortar.

  Conventionally, as a method of repairing cracked parts of concrete surface, deteriorating parts such as junkers, etc., a method of injecting repair material such as cement milk added with water into cement into concrete degrading parts such as cracks is known. ing.

However, in the concrete repair method as described above, it may be necessary to drill holes for injecting a repair material in the cracked portion, which increases the size of the apparatus and increases the construction cost.
Further, if a hole for injecting a repair material is drilled in a concrete deteriorated portion, the deteriorated portion is further damaged, which is not preferable from the viewpoint of the strength of the concrete structure.
Further, when cement milk is used as a repair material, the cement hydration reaction proceeds during the pouring process, so the pouring operation needs to be completed in a short time, and there is a time limit on the work.
For this reason, cement-based aerosol products have been proposed as materials for use in concrete repair methods that are simple in equipment and equipment and do not damage concrete degradation sites (Patent Documents 1 to 3).

  These cement-based aerosol products are made by filling super fast-hardening cement with an injection gas in an aerosol container and spraying it onto the repaired part of the concrete, repairing it, making the equipment and equipment simple and providing concrete. It can be repaired without damaging the deteriorated part.

In the conventional cement-based aerosol products as described above, the aerosol container body is usually made of metal, while the dip tube inserted into the container body and the nozzle of the jet outlet for ejecting the cement composition are made of synthetic resin. is there.
Accordingly, there is a difference in chargeability, and static electricity is likely to be generated particularly in a combination of a synthetic resin dip tube or nozzle that is very easily charged and a metal container body.
When the cement composition filled inside such cement-based aerosol products where static electricity is generated is ejected, the cement composition is solidified by static electricity, and it becomes difficult to clog into the ejection nozzle or dip tube, and spray There is a problem that the efficiency of work decreases. Furthermore, when the aerosol can is brought close to the ejection surface, there is a case where electric discharge occurs due to a potential difference.

JP 2004-346635 A JP 2005-162999 A JP 2007-191484 A

  This invention is made | formed in view of the above problems, and makes it a subject to provide the cement-type aerosol product which can perform a spraying operation | work favorably.

In order to solve the above problems, the inventors of the present invention have provided a cement-based aerosol product in which an aerosol container including an injection nozzle and a dip tube is filled with a cement composition containing cement together with an injection gas. The main body and the injection nozzle are made of metal, the dip tube is made of synthetic resin, the inner diameter of the injection nozzle is 1.6 mm to 2.0 mm, and the inner diameter of the dip tube is 2.9 mm to 3. A cement-based aerosol product characterized by being 3 mm is provided.

Moreover, the said organic solvent is a nonflammable or a flame-retardant organic solvent, and 50-100 weight part of nonflammable or a flame-retardant organic solvent is contained in the said cement composition with respect to 100 weight part of cement.

Furthermore, it is preferable that the injection gas is a nonflammable or flame-retardant injection gas .

  According to the present invention, since the container body of the aerosol container of the cement-based aerosol product and the spray nozzle are both made of metal, static electricity is hardly generated. Therefore, it can prevent that an internal cement composition is hardened by static electricity and becomes difficult to eject, and can suppress the fall of spraying work efficiency.

Further, since the inner diameter of the injection nozzle is 1.6Mm～2.0Mm, the inner diameter of the injection nozzle is relatively large diameter with respect to the cement composition, for example, even if caused some static electricity, during the injection It can suppress that a cement composition solidifies and clogs in a nozzle.
Likewise for the inner diameter of the dip tube is 2.9Mm～3.3Mm, it is possible to prevent the cement composition from being clogged in the tube.

  Furthermore, when an organic solvent is mixed in the cement composition, friction in the cement composition is reduced, so that static electricity is less likely to be generated. At the same time, since it is a non-flammable or flame retardant organic solvent, static electricity should be generated. Even if it occurs, it is hard to ignite and becomes a highly safe cement-based aerosol product.

  In addition, even when the propellant gas is a non-flammable or flame retardant organic solvent, it is difficult to ignite, resulting in a cement-based aerosol product with higher safety.

Embodiments of the present invention will be described below.
First, the cement aerosol product of the present invention will be described.

  The cement-based aerosol product of the present embodiment is formed by filling a cement composition containing a super-hard cement, an organic solvent, and an admixture with an injection gas in an aerosol container.

The aerosol container includes a metal container main body, a dip tube inserted into the container main body, and a cap portion including an injection nozzle formed to be able to communicate with the dip tube.
The injection port of the injection nozzle opens to the outside, and the opening on the rear end side of the injection nozzle opens below the cap portion, but is usually sealed.
A movable means for moving up and down the cap such as a spring is provided below the cap portion. When the cap portion is pressed downward, the spring contracts and the cap portion moves downward, and the rear end of the injection nozzle The side opening communicates with the dip tube, and the container body communicates with the outside through the dip tube and the injection nozzle.

The container body is made of iron and has a tin plating layer on the surface. The spray nozzle is also made of the same metal as the can, such as iron.
The injection nozzle has an inner diameter of 1.6 mm to 2.0 mm.
When formed on the inner diameter of such an injection nozzle, even if static electricity is generated, it is easy to inject without clogging the cement composition in the injection nozzle during injection.

The dip tube and the cap are made of a synthetic resin such as polyethylene.
Inner diameter of the dip tube 2.9Mm～3.3Mm, Ru preferably 3.1mm~3.3mm der.
In the case of such an inner diameter of the tube, even when static electricity is generated, it is easy to spray without clogging the cement composition in the tube at the time of spraying.

  In the above-mentioned aerosol container, the cement composition is sealed in a high-pressure state together with the injection gas.

The cement composition includes a super fast cement and an organic solvent.
The ultrafast cement is preferably an ultrafast cement with a setting time (termination time) measured in accordance with JIS R5201 of about 1 minute to 60 minutes.
The ultrarapid cement, for example, as a main component _{11CaO · 7Al 2 O 3 · CaF} 2, so-called jet cement; Portland cement and alumina cement super rapid setting cement composed of a three components of the gypsum; such as alumina cement alone is Can be used.

As the organic solvent, an incombustible or flame retardant organic solvent is preferable from the viewpoint of safety. By mixing the organic solvent with the ultrafast cement, the friction between the cement particles is reduced and the generation of static electricity can be further suppressed.
Here, the non-flammable organic solvent means an organic solvent having no flash point, and the flame-retardant organic solvent means an organic solvent having a flash point of 250 ° C. or higher. None of them are classified as dangerous substances under the Fire Service Law.

Examples of the organic solvent include hydrocarbons such as pentane and hexane, fluorocarbon compounds such as chemical formulas CF ₃ CF ₂ CHCl ₂ , CClF ₂ CF ₂ CHClF, CF ₃ CH ₂ CHF ₂ , and C ₅ H ₂ F ₁₀ , ethanol Alcohols such as methanol, halogenated hydrocarbons such as dichloromethane and trichloroethylene, ethers such as diethyl ether and ethyl vinyl ether, and ketones such as acetone and methyl ethyl ketone can be used.
In particular, among these organic solvents, nonflammable or flame retardant organic solvents such as halogenated hydrocarbons are preferable. The said organic solvent may be used individually by 1 type, and may mix and use 2 or more types.

The addition amount of the organic solvent, to the ultra-rapid setting cement 100 parts by weight, 5 0-100 parts by weight.
Since it is the said range, friction of a cement particle can be reduced and generation | occurrence | production of static electricity can be suppressed effectively.

The cement composition in the present embodiment is filled in the aerosol container together with the injection gas.
As the injection gas, known ones that are usually used for aerosols can be used as appropriate. For example, liquefied petroleum gas such as propane and butane, compressed gas such as dimethyl ether, chlorofluorocarbon or alternative chlorofluorocarbon, nitrogen, and air can be used. Used. Fluorocarbons or alternative chlorofluorocarbons include HCFC-22, HCFC-123, HCFC-124, HCFC-142b, HCFC-125, HCFC-134a, HCFC-152a, HFO-1234yf, HFO-1234Ze, CF ₃ I, or these Mixtures and the like can be used.
In particular, among these injection gases, incombustible or flame-retardant injection gases such as Freon or alternatives are preferable.

  The cement composition is filled in an aerosol container together with the injection gas as described above. At this time, the inside of the container main body is in a state of being pressurized to about 0.2 MPa to 0.6 MPa.

When using such a cement-based aerosol product, first, the pressing portion of the aerosol container is pushed, and the cap portion is pushed downward, so that the opening on the rear end side of the injection nozzle communicates with the dip tube. .
As described above, since the inside of the aerosol container body is in a pressurized state, when the spray nozzle and the dip tube communicate with the outside, the cement composition is ejected from the nozzle at a stretch.
At this time, since the injection nozzle of the present embodiment is made of a metal that is not easily charged with the container body, the injection nozzle, the dip tube, or the cement composition is difficult to be charged, and static electricity is hardly generated. Therefore, it can suppress that a cement composition solidifies with static electricity, and is blocked in an injection nozzle or a dip tube.

  As long as the effects of the present invention are not significantly impaired, conventionally known technical matters such as the configuration of the aerosol container and the composition of the cement composition, which are not detailed here, can be employed in the present invention. .

  EXAMPLES Next, although an Example is given and this invention is demonstrated in more detail, this invention is not limited to these.

(Cement-based aerosol products)
Each cement composition described in Table 1 was prepared and filled in an aerosol container.
As the aerosol container, a dip tube and a nozzle having the following sizes and materials were prepared.
Two types of dip tubes were prepared, made of polyethylene (PE) resin and having an inner diameter of 2.5 mm (normal diameter) and 3.1 mm (large diameter).
The nozzle is made of PE resin with an inner diameter of 1.2 mm (ordinary diameter), made of PP resin with an inner diameter of 1.6 mm (large diameter), and made of iron with an inner diameter of 1.6 mm and tin-plated on the surface Three types (large diameter metal) were prepared.
The aerosol container body was made of iron and had a volume of 520 ml with a chromium plating on the surface.
Using an aerosol container filled with a cement composition having the composition shown in Table 1, the amount of charge was measured when sprayed for 10 seconds continuously.
As a jetting object, a pavement board was installed on the floor of the room, and jetting was performed so that the distance between the pavement board surface and the tip of the jet nozzle was about 30 cm.
The floor was covered with a vinyl sheet, and the measurement was performed under conditions of room temperature 20 ° C. and humidity 50%.
For the measurement of the charge amount, the charge amount of the injection target and the main body portion of the aerosol container was measured using a static electricity measuring device (product name: STATIRON-DZ3, manufactured by Sisid Electrostatic Co., Ltd.).
The injection target is measured at the center of the injection surface, and the aerosol container is measured near the center of the main body. The results when the measurer wears silicon rubber gloves at the time of determination are shown in Table 2, and polyethylene gloves are attached. The results are shown in Table 3.

  According to Tables 2 and 3, in each example, the charge amount of both the injection target and the container main body is lower than that of the comparative example.

Claims (2)

In a cement-based aerosol product in which an aerosol container including a spray nozzle and a dip tube is filled with a cement composition containing cement together with a spray gas,
The cement composition contains 50 to 100 parts by weight of an incombustible or flame retardant organic solvent with respect to 100 parts by weight of cement,
The container body of the aerosol container and the injection nozzle are made of metal,
The dip tube is made of synthetic resin,
An inner diameter of the injection nozzle is 1.6 mm to 2.0 mm;
A cement-based aerosol product, wherein the dip tube has an inner diameter of 2.9 mm to 3.3 mm.   The cement-based aerosol product according to claim 1, wherein the jetting gas is a nonflammable or flame-retardant jetting gas.