JPH0669678B2 - Injection liquid for fluid jet processing equipment - Google Patents

Description

The present invention relates to an object such as a building, a structure, a building material, a plate material, concrete, or a processed product that ejects an ultrahigh pressure fluid from a nozzle and faces the ejected fluid. The present invention relates to an injection liquid used in a fluid jet processing apparatus applied to perform processing such as cutting, punching, and grinding.

[Conventional technology]

Conventionally, so-called water that jets ultra-high pressure water from a nozzle and performs processing such as cutting, drilling, and grinding on objects such as buildings, structures, building materials, plates, concrete, and workpieces that face the jetted liquid. Various types of fluid jet processing devices called jets have been disclosed. In such a fluid jet processing apparatus, in order to grind various objects, that is, solids, a method of processing ultra-high pressure water of 500 to 3000 kgf / cm ² from a nozzle to process the solids, or a jet of high pressure water is jetted. There is already known a method of removing foreign substances on a metal surface, such as scales and iron rust, by flow to perform surface processing. In addition, nitrites, phosphates, etc. are generally known as iron rust inhibitors.

For example, in Japanese Examined Patent Publication No. 56-42413, a liquid such as water, a chemical liquid, and a grinding liquid is jetted as a fine cotton jet stream from an jet nozzle, and the jet stream is made to collide with a workpiece facing the jet stream. There is disclosed a jet processing apparatus that performs processing such as punching, cutting, and cutting a work piece.

Further, Japanese Patent Laid-Open No. 63-16999 discloses an abrasive water jet cutting device. The abrasive water jet cutting device has a material to be cut placed between a jet nozzle and a catcher, and then supplies ultra-high pressure water to the jet nozzle via a high-pressure water supply hose and contains a fine-grain abrasive. A method in which a suspension is supplied to a jet nozzle via a suspension supply hose, and thereby a jetting liquid in which fine abrasives are mixed is jetted as a jet stream from the jet nozzle, and the material to be cut is cut by the jetting liquid. Is. Alumina-based fine powder and silicon carbide-based fine powder are used as the fine abrasive, and the concentration of the suspension is adjusted to 20 to 70%.

[Problems to be Solved by the Invention]

However, in a normal water jet, the jet pattern of the jet flow itself is in a diffused state, and when colliding with the workpiece, the collision energy of the jet flow, that is, the collision force is reduced, and the grinding ability becomes weak. Further, when the high-viscosity liquid is sucked into the pump, there is a problem that the pump is frequently damaged due to overload. Further, there is no correlation between the viscosity of the jet liquid and the effect of the water jet.

In addition, the surface of a metal such as iron whose surface is ground and cleaned by jetting a liquid such as water, a chemical liquid, a grinding liquid, or a polymer aqueous solution is oxidized again in a short time to generate rust. There's a problem.

By the way, rust inhibitors such as sulfites and phosphates, which have been conventionally used for rust prevention of iron, have the drawback of lowering the viscosity of the polymer and cannot be used in combination with the polymer aqueous solution. . Moreover, sulfite, a rust preventive, is toxic,
When used in a fluid jet processing device in which the mist of the nitrite is scattered, there is a risk of causing an industrial accident, and it is difficult to ensure safety. Therefore, in a state where nitrite, which is a rust preventive agent, is mixed in the injection liquid, it cannot be safely used as the injection liquid of the fluid jet processing apparatus.
Further, the anticorrosive effect of phosphate is insufficient for grinding a metal surface.

An object of the present invention is to solve the above-mentioned problems, and to add a water-soluble polymer for jetting a jet flow into a jet pattern in a converged state as a jet liquid used in a fluid jet processing apparatus, and to prevent metal surfaces and the like. In order to achieve rust, a chemical agent with excellent rust removal effect is added to an aqueous polymer solution to generate a jetting liquid for a fluid jet processing device. In particular, an acrylic resin that has a special physical property range among water-soluble polymers. The ionic water-soluble polymer was found to be optimal, and a rust preventive composed of a salt of an organic dibasic acid having 6 or more carbon atoms, which can ensure safety, was added to the acrylic ionic aqueous solution polymer. A liquid jet processing device injection liquid that improves the efficiency and rust-prevention effect of the fluid jet injected from the jet nozzle without adding a high load to the pump to generate an injection liquid It is to provide.

[Means for Solving the Problems]

The present invention is configured as follows to achieve the above object. That is, the present invention has 2 to 50 mol% of anionic monomer units and 50 mol% or more of acrylamide monomer units, and has an intrinsic viscosity in 1N saline.
0.02 to 0.2% of acrylamide copolymer with 10 dl / g or more
It is dissolved by weight% and has an organic dibasic acid radical having 6 or more carbon atoms.
The present invention relates to a jet liquid for a fluid jet processing apparatus, which is composed of an aqueous solution having a concentration of 1 to 1% by weight.

As the organic dibasic acid having 6 or more carbon atoms, adipic acid,
Examples thereof include sebacic acid, dodecanoic acid, and phthalic acid. Particularly, sebacic acid and dodecanoic acid, that is, 1,10-decanedicarboxylic acid are effective and can ensure safety.

As the salt of the organic dibasic acid having 6 or more carbon atoms, an alkali metal salt or a non-volatile amine salt is used,
Commonly used are sodium, potassium, diethanolamine, triethanolamine, diisopropanolamine, triisopropanolamine, etc., which exist in the form of a salt of a dialkylaminoalkyl (meth) acrylamide group or a dialkylaminoalkyl (meth) acrylate group. It is also possible. On the other hand, as the water-soluble polymer used in the present invention, an anionic acrylamide copolymer having an anionization rate of 2 to 50 mol% is effective. As the anionic acrylic monomer copolymerized with acrylamide,
Alkali metal salts of (meth) acrylic acid and acrylamido-2-methylpropanesulfonic acid, amine acids, ammonium salts and the like are used. These anionic acrylamide copolymers may contain a monomer unit copolymerizable with the acrylamide and anionic acrylic monomer in an amount within the range (20 mol% or less) that does not impair the effect of the injection liquid according to the present invention. Good. These monomers include dialkylaminoalkyl (meth) acrylates,
Examples thereof include dialkylaminoalkyl (meth) acrylamide, diacetone acrylamide, hydroxyethyl (meth) acrylate, acrylonitrile and styrene. In addition, a polyacrylamide partial hydrolyzate having the same molecular structure as these copolymers or a polyacrylamide sulfomethylated product can be used for the same purpose. These anionic acrylamide copolymers preferably have a high molecular weight, and the intrinsic viscosity in 1N saline is preferably 10 dl / g or more.

Furthermore, it has 6 carbon atoms with the anionic acrylamide copolymer.
The above-mentioned organic dibasic acid salt can be compounded at any stage, and in addition to mixing in a powder state, it can be stored in a liquid containing both, or both can be mixed immediately before injection from a nozzle. That is also effective.

[Action]

The jet liquid for a liquid jet processing device according to the present invention is configured as described above and operates as follows. That is,
This jet solution, that is, a polymer aqueous solution containing a rust preventive agent
When pressurized from 0 kgf / cm ² and jetted from the nozzle, it collides with an object in a convergent jetting pattern without diffusing a water flow, that is, a jet flow compared to conventional ultra-high pressure water,
The energy of the jet stream does not dissipate, it strongly collides against foreign substances such as oxides present on the surface of metals such as iron, and the foreign substances can be forcibly and strongly removed, Immediately adsorbing the rust preventive agent on the metal surface from which foreign substances have been removed, the surface is covered and rust is prevented from occurring on the metal surface. That is, at the same time that the metal surface is cleaned, an organic dibasic acid having 6 or more carbon atoms is adsorbed on the metal surface, and a rust preventive effect is exerted on the metal surface. Moreover, the organic dibasic acid having a carbon number of 6 or more has the effect of lowering the surface tension of the jet liquid, and promotes the phenomenon of converging the jet pattern of the jet flow formed by the jet liquid, that is, the polymer aqueous solution. Furthermore, the organic dibasic acid having a carbon number of 6 or more does not cause deterioration of the polymer, and does not adversely affect the coating process for the surface of the workpiece after the processing process by the fluid jet processing device is completed. When this jet liquid is jetted from a fluid jet processing device as a jet stream, the above properties are combined to provide an excellent rust removal effect for an object, and the object is ground, cleaned, cut, drilled, and chipped. It is possible to form a jet flow having an injection pattern in a very preferable state for processing such as.

〔Example〕

Embodiments of the fluid jet processing device injection liquid according to the present invention will be described below. In FIG. 1, a jet nozzle for jetting this jet liquid is shown. With respect to the jet nozzle, a nozzle holder 3 is attached to a hollow rotary body 1 for supplying ultrahigh pressure fluid, and a plurality of nozzles 2 are attached to the nozzle holder 3. Therefore, this jet nozzle forms a jet flow by ejecting the jet liquid from each nozzle 2 while rotating against an object such as a concrete plate 5 in which a reinforcing bar 4 facing the jet nozzle is embedded. The object can be ground or chipped by, for example, as indicated by the chain line 6.

Example-1 In order to produce an injection liquid for a fluid jet processing apparatus according to the present invention, a neutralization product of a polymer shown in Table-1 and an organic acid salt shown in Table-2 were dissolved in water to prepare an injection liquid. . As the jet nozzle shown in FIG. 1, a double-head type jet nozzle in which the hole diameter of the nozzle 2 is 0.5 mm and the distance between the nozzles 2 is 45 mm is used. While rotating the nozzle holder 3 to which these nozzles 2 are attached at 200 rpm, each injection liquid described in Table 3 is passed through the hollow rotary body 1 for supplying super-high pressure fluid and the nozzle holder 3 at a pressure of 2000 kgf / cm ² for each nozzle. It was jetted from No. 2 and ground while moving the object, that is, the specimen.

The sample is a reinforced concrete plate 5 having a compressive strength of 700 kgf / cm ² , the moving speed of the sample is 200 mm / min, and the distance between the nozzle 2 and the concrete plate 5 is 10 mm. Table 3 shows the carved depth of the concrete plate 5 and the surface state (presence or absence of iron rust) of the reinforcing bar 4 after 30 minutes.

The concentrations of these organic acid salts are shown in Table 3 as the weight% of the organic acid containing no counter ion.

Example-2 The same injection liquid as that used in Example-1 was used, and rust removal of the iron segment in the shield construction method was performed under the following conditions. The results are shown in Table-4.

Iron segment dimensions: 90 cm in height, 140 cm in width Iron rust condition: Occurrence in the whole with a thickness of 0.5 to 1.5 mm End guideline: Smooth surface appears and no rust is observed Injection conditions: Nozzle 0.2 mm φ × 4 Pressure 2000 kgf / cm ² Number of samples : 5 pieces per injection liquid [Effects of the Invention] The present invention is configured as described above and has the following effects. That is, the present invention has 2 to 50 mol% of anionic monomer units and 50 mol% or more of acrylamide monomer units, and has an intrinsic viscosity in 1N saline.
0.02 to 0.2% of acrylamide copolymer with 10 dl / g or more
It dissolves by weight% and has an organic dibasic acid radical having 6 or more carbon atoms.
Since it is composed of an aqueous solution of 1 to 1% by weight, the jet flow of the jet liquid jetted from the fluid jet processing device is jetted in a jet pattern in a converged state as compared with the conventional jet pattern, and the energy of the jet stream is reduced. It is possible to achieve a high processing speed such as grinding and a high processing accuracy without lowering the processing speed. Moreover, the anticorrosive effect on an object such as a metal surface can be exerted at the same time as the metal surface processing.

That is, although sodium sulfite that has been conventionally used has an anticorrosive action, when mixed with an aqueous polymer solution, it lowers the grinding efficiency by a jet flow and is toxic to the human body. The rust preventive mixed in the aqueous polymer solution does not lower the grinding efficiency and can ensure the safety. Further, the jet flow formed by the jet liquid jetted from the jet nozzle can form a converged state as compared with the jet flow formed by the conventional ultra-high pressure water without giving a high load to the pump. The processing ability such as grinding efficiency can be exerted strongly for the work piece. Moreover, since this rust preventive agent is uniformly mixed in the polymer aqueous solution, the metal surface of the workpiece or the like is quickly and evenly coated on the metal surface simultaneously with the processing such as the removal of foreign matter. There is no chance that the surface will be jetted and exposed to the air, and the rust preventive agent can be coated to improve the rust preventive effect. Further, working and rustproofing are simultaneously performed on the metal surface, so that work efficiency can be improved. For example, when the jet liquid according to the present invention is used as a jet liquid for a fluid jet processing apparatus, it is particularly suitable for removing metal surface foreign matter such as iron plate, steel frame, and reinforcing bar, and processing such as metal surface grinding. , These metal members are effective when used for repair work of aged structures existing deep in concrete or the like. As an example, the exposed surface of the reinforcing bars embedded in the concrete (see Fig. 1) is cleaned by grinding and removing the chipping etc. by a jet flow that ejects unnecessary concrete structures from the fluid jet processing device. Or
Alternatively, when the surface of the rebar is subjected to processing such as grinding, and the rust-preventive state of the metal surface is maintained until concrete is placed again, the effect can be extremely effectively exhibited. It is ideal for repair work.

[Brief description of drawings]

FIG. 1 is a schematic view of a jet nozzle used for jetting a jet liquid for a fluid jet processing device according to the present invention. 1 ... Hollow rotor for supplying super high pressure fluid 2 ... Nozzle, 3
...... Nozzle holder, 4 ... Reinforcing bar, 5 ... Concrete.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Yuichi Sugiyama, Inventor Yuichi Sugiyama, Adachi-ku, Tokyo 1-10-5 (56) References JP-A-51-31986 (JP, A) JP-A-2-237799 (JP, A) )

Claims (3)

[Claims] 1. From 2 to 50 mol% of anionic monomer units
Having 50 mol% or more of acrylamide monomer units, 1
Fluid jet processing consisting of an aqueous solution in which 0.02 to 0.2% by weight of an acrylamide copolymer having an intrinsic viscosity of 10 dl / g or more in normal saline is dissolved and 0.1 to 1% by weight of an organic dibasic acid radical having 6 or more carbon atoms is dissolved. Injection liquid for equipment. 2. The jet liquid for a fluid jet processing apparatus according to claim 1, wherein the organic dibasic acid radical having 6 or more carbon atoms is sebacic acid radical and / or dodecane nitric acid radical. 3. The counterion of the organic dibasic acid radical having 6 or more carbon atoms is selected from diethanolamine, triethanolamine, diisopropanolamine, triisopropanolamine, or a mixture thereof.
A jet liquid for a fluid jet processing apparatus according to item 1.