JPH02237800A - Injection liquid for fluid jetting device - Google Patents

Abstract

PURPOSE:To display a rust preventive effect on the body of a metal surface, etc., simultaneously with the surface working of a metal by using a water solution melting a specified acrylamid copolymer at 0.02-0.2wt.% and melting an organic dibasic acid radical having more than six carbons at 0.1-1wt.% as an injection liquid. CONSTITUTION:An injection liquid is made a jet flow by projecting it to the body of a concrete plate 5, etc., in which a reinforcement 4 is imbedded, from a rotating jet nozzle 2, and this body is subjected to grinding as shown by a chain line 6. In this case, the injection liquid melts at 0.02-0.2wt.% the acrylamid copolymer having an ammonionic monomer unit of 2-50mol% and acrylamid monomer unit of more than 50mol% and whose proper viscosity in one specified brine is >=10dl/g, and also is made a water solution melting at 0.1-1wt.% the organic hydrochloric acid radical having more than six carbons as a rust preventive. Consequently, the jet flow is injected in the jet pattern of a restraint state and the surface of the body subjected to grinding is subjected to a rust preventive processing.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention sprays ultra-high pressure fluid from a nozzle, and objects such as buildings, structures, building materials, plates, concrete, and processed products that face the sprayed fluid. The present invention relates to a jetting liquid used in a fluid jet machining device commonly used for cutting, drilling, grinding, etc.

[Conventional technology]

Conventionally, so-called water aqua regia is injected from a nozzle, and objects such as buildings, structures, building materials, plates, concrete, and workpieces are processed such as cutting, drilling, and grinding by injecting Zhaogao aqua regia from a nozzle. Various fluid jet processing devices called jets have been disclosed. Such fluid dij. ” / To processing equipment uses 500 to 3000 k from the nozzle for grinding various objects, i.e., solids.
A method of processing the solid by injecting ultra-high pressure water of g-f/1, or a method of removing foreign matter on the metal surface, such as scale and ironwork, using a jet stream of high-pressure water to process the surface. The method to do this is already known. Also, in general,
Nitrite, phosphate, etc. are known as rust preventive agents for iron. For example, Japanese Patent Publication No. 56-42413 discloses that a liquid such as water, a chemical liquid, or a grinding liquid is injected from an injection nozzle as a thin line-shaped jet stream, and the jet stream collides with the workpiece facing the object. BACKGROUND ART A jet processing device is disclosed that performs processing such as drilling, cutting, and clipping of a workpiece.

Further, Japanese Patent Application Laid-open No. 16999/1983 discloses an abrasive water jet cutting device. This abrasive water jet cutting device places the material to be cut 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 also supplies fine abrasive material to the jet nozzle. The containing suspension is supplied to a jet nozzle via a suspension supply hose, whereby the jet nozzle injects a jet stream containing the fine abrasive material, and the jet stream injects the jet stream. The cutting material is cut and processed.As the fine abrasive material, alumina-based fine powder and silicon carbide-based hard grain powder are used, and the concentration of the suspension is adjusted to 20 to 70%. (Problem to be Solved by the Invention) However, in a normal water jet, the injection pattern of the jet stream itself is in a diffused state, and when it collides with the workpiece, the collision energy, that is, the collision force of the jet stream is In addition, when a highly viscous liquid is sucked into a pump, the pump frequently malfunctions due to overload.Also, the viscosity of the injected liquid and the effect of water jet '7 There is not necessarily a correlation between them.

In addition, metal surfaces such as iron that have been ground or cleaned by spraying liquids such as water, chemical fluids, grinding fluids, or aqueous polymer solutions are said to undergo oxidation again within a short period of time, resulting in rust. There's a problem.

By the way, rust inhibitors such as nitrites and phosphates that have been conventionally used to prevent rust on iron have the disadvantage of reducing the viscosity of the polymer, and cannot be used together with an aqueous polymer solution. . Moreover, nitrite, which is a rust preventive agent, is toxic, and its use in fluid jet processing equipment where nitrite mist is scattered may cause industrial accidents, making it difficult to ensure safety. ．． Therefore, if the spray liquid contains nitrite, which is a rust preventive agent, it cannot be safely used as a spray liquid for fluid jet processing equipment.
Furthermore, the anti-corrosion effect of phosphates is insufficient for grinding metal surfaces.

The purpose of this invention is to solve the above-mentioned problems, and in addition to adding a water-soluble polymer to the injection liquid used in a fluid jet processing device to inject a jet stream into a convergent injection pattern, In order to achieve rust, a chemical with excellent anti-corrosion effect is added to a polymer aqueous solution to generate a jetting liquid for fluid jet processing equipment.In particular, acrylic which has a special physical property range among water-soluble polymers is used. We have discovered that an acrylic ionic water-soluble polymer is optimal, and we have also developed a rust inhibitor consisting of a salt of an organic dibasic acid with 6 or more carbon atoms that can ensure safety. To provide an injection liquid for a fluid jet processing device that is added to an aqueous solution of molecules to generate an injection liquid and improves the efficiency and rust prevention effect of a fluid jet injected from a jet nozzle without applying a high load to a pump. It is.

[Means to solve the problem]

In order to achieve the above object, the present invention is configured as follows. That is, the present invention has 2 to 50 mol% of anionic monomer nLlffl and 50 mol% or more of acrylamide monomer units, and has an intrinsic viscosity of 10a in 1N saline! 0.02 to 0.2% by weight of an acrylamide copolymer having a carbon number of #g or more and a carbon number of 6
The present invention relates to an injection liquid for use in a jet processing device, which is made of an aqueous solution in which 0.1 to 1% by weight of the above organic dibasic acid radical is dissolved.

Examples of organic dibasic acids having 6 or more carbon atoms include adipic acid,
Examples include sebacic acid, dodecanniic acid, phthalic acid, etc., and particularly sebacic acid, dodecanniic acid, ie, 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 nonvolatile amine salt is used,
Sodium, potassium, diethanolamine, triethanolamine, diisovanolamine, triisobrobanolamine, etc. are common, and exist in the form of a salt of a dialkylaminoalkyl (meth)acrylamide group or a dialkylaminoalkyl (meth)acrylate group. It is also possible to do so. On the other hand, as the water-soluble polymer used in this invention, an anionic acrylamide copolymer having an anionization rate of 2 to 50 mol% is effective. As the anionic acrylic monomer to be copolymerized with acrylamide, alkali metal salts, amine salts, ammonium salts, etc. of (meth)acrylic acid and acrylamide-2-methylpropanesulfonic acid are used. These anionic acrylamide copolymers contain monomer units copolymerizable with acrylamide and anionic acrylic monomers in an amount (20 mol% or less) that does not impede the effectiveness of the injection liquid according to the present invention. It's okay.

These monomers include dialkylaminoalkyl (meth)acrylate 1, dialkylaminoalkyl (
Examples include meth)acrylamide, diacetone acrylamide, hydroxyethyl (meth)acrylate, acrylonitrile, and styrene. Furthermore, partially hydrolyzed polyacrylamide or sulfomethylated polyacrylamide having the same molecular structure as these copolymers can also be used for the same purpose. These anionic acrylamide copolymers preferably have a high molecular weight and have an intrinsic viscosity in 1N saline of IOd1/
It is desirable that it is more than g.

Furthermore, anionic acrylamide copolymer and carbon number 6
The above organic dibasic acid salts can be blended at any stage, and in addition to being mixed in powder form, it is also possible to store them in a liquid containing both, or to mix both immediately before injection from a nozzle. It is also effective. [Function] The injection liquid for a fluid jet processing device according to the present invention is constructed as described above, and functions as follows. That is,
This injection liquid, that is, a polymer aqueous solution containing a rust preventive agent, was
When pressurized to 3000 ktf/ad and injected from a nozzle, compared to conventional ultra-high-pressure water, the jet stream collides with the object with a convergent spray pattern without diffusing the jet stream. It strongly collides with foreign substances such as oxides existing on the surface of metals such as iron without dissipating energy, and can forcibly and powerfully remove the foreign substances, and also prevents rust in the sprayed liquid. The agent immediately adsorbs onto the metal surface from which foreign matter has been removed, coating the surface and preventing rust from forming on the metal surface. That is, at the same time as the metal surface is cleaned, an organic dibasic acid having 6 or more carbon atoms is adsorbed onto the metal surface, thereby exerting a rust-preventing effect on the metal surface. Moreover, the organic dibasic acid having 6 or more carbon atoms has the effect of lowering the surface tension of the injection liquid, and promotes the phenomenon of converging the injection pattern of the jet stream formed by the injection liquid, that is, the aqueous polymer solution. Furthermore, the number of carbon atoms is 6
The above-mentioned organic dibasic acids do not cause deterioration of the polymer, and do not have any adverse effect on the coating treatment on the surface of the workpiece after the processing by the fluid diesolith processing apparatus is completed. When this injection liquid is injected as a jet stream from a fluid jet machining device, the above properties combine to provide an excellent rust removal effect on the object, as well as grinding and polishing of the object.
It is possible to form a jet stream with an extremely favorable spray pattern for processing such as cleaning, cutting, drilling, and chiseling. [Embodiment] Hereinafter, an embodiment of the injection liquid for a fluid jet machining apparatus according to the present invention will be described. In FIG. 1, a jet nozzle for spraying this injection liquid is shown. Regarding the jet nozzle, a nozzle holder 3 is attached to the hollow rotating body 1 for supplying ultra-high pressure fluid, and a plurality of nozzles 2 are attached to the nozzle holder 3. Therefore, this jet nozzle rotates and injects the liquid from each nozzle 2 to an object such as a concrete plate 5 in which reinforcing bars 4 are embedded, which faces the nozzle, to generate a jet flow. The above-mentioned object can be ground or spun, for example, as shown by the chain line 6, using the die-cutting flow. Example 1 In order to produce a jet liquid for a fluid jet processing device according to the present invention, a neutralized polymer shown in Table 1 and an organic acid salt shown in Table 2 were dissolved in water to prepare a jet liquid. ．． As for the jet nozzle shown in Fig. 1, the hole diameter of nozzle 2 is 0.5 m.
s, a double-headed jet nozzle is used with the distance between nozzles 2 and 2 being 45+ mm. The nozzle holder 3 with these nozzles 2 attached was heated to 200 rpm.
While rotating at
A pressure of 000 kgfI was injected from each nozzle 2, and the object, that is, the specimen, was ground while being moved.

The above specimen is a reinforced concrete plate 5 having a compressive strength of 700 kgf/1, and the moving speed of the specimen is 20 kgf/1.
0 mm/min, and the distance between the nozzle 2 and the concrete plate 5 is set to lOmm+. Also, concrete plate 5
The scraped depth and the surface condition H (presence or absence of iron rust) of the reinforcing bar 4 after 30 minutes are listed in Table 1-3.

However, the meanings of the abbreviations in the table are as follows.

AAM = acrylamide AMPS - acrylamide 2-methylbrobanesulfonic acid A,61C -acrylic acid DMAPAA. =Dimethylaminobrobyl acrylamide [η]-1 Intrinsic viscosity in normal saline Table 3 The concentrations of these organic acid salts are shown in Table 3 as % of the organic acids not containing counter ions.

(Hereinafter, the margin of this page) Example 2 Using the same injection liquid as that used in Example 1, rust removal of iron segment 1- in the shield method was carried out under the following conditions. The results are shown in Table 4. Iron segment Iron rust status: Estimated completion: Injection conditions: Dimensions: 90 mm vertically, 140 mm wide, 0.5 to 1.5 mm thick, with a smooth surface and no rust observed throughout Nozzle 0.2 mφ ×4 Pressure 2000 kgf/cal Number of samples: 5 per injection liquid Table 4 [Effects of the Invention] The present invention is configured as described above and has the following effects. That is, the present invention provides an acrylamide copolymer having 2 to 50 mol% of anionic monomer units and 50 mol% or more of acrylamide monomer units and having an intrinsic viscosity of IOdl/g or more in 1N saline. Since it is composed of an aqueous solution in which 0.02 to 0.2 weight percent is dissolved and 0.1 to 1 weight percent of an organic dibasic acid group having 6 or more carbon atoms is dissolved, the jet stream of the injection liquid injected from the fluid jet processing device is Compared to conventional injection patterns, the injection pattern is more convergent and does not reduce the energy of the Ginoto flow, making it possible to achieve high machining speeds such as grinding and high machining accuracy. can. In addition, the antirust effect on objects such as metal surfaces can be exerted simultaneously with metal surface processing.

In other words, the conventionally used sodium nitrite has a rust-preventing effect, but when used mixed with a polymer aqueous solution, it reduces the grinding efficiency of the Geft flow and is toxic to the human body. The rust preventive agent mixed into the aqueous polymer solution according to the invention does not reduce grinding efficiency and can also ensure safety. In addition, without applying a high load to the pump, the jet flow formed by the jet liquid injected from the jet nozzle can form a converged state compared to the jet flow formed by conventional high-pressure water, and It can strongly demonstrate processing capabilities such as grinding efficiency on the workpiece. Moreover, since this rust preventive agent is uniformly mixed into the polymer aqueous solution, it is quickly and evenly coated on the metal surface of the workpiece etc. at the same time as processing such as removing foreign matter from the metal surface. The rust preventive agent coating is performed without the surface being exposed to the air, and the rust preventive effect can be improved. Additionally, processing and anti-corrosion treatment can be performed on metal surfaces at the same time, improving work efficiency. For example, when the injection liquid according to the present invention is used as an injection liquid in a fluid jet processing device, it is particularly suitable for removing foreign matter from metal surfaces such as steel plates, steel frames, and reinforcing bars, and for processing metal surfaces such as grinding. ,
These metal members are extremely effective when used for repair work of old structures that exist deep in concrete and the like.

For example, by removing unnecessary concrete structures with a jet stream from a fluid mechanical processing device, the exposed surface of reinforcing bars embedded inside the concrete (see Figure 1) can be removed by chipping or other grinding. Clean or
Alternatively, it can be extremely effective in cases where the surface of the reinforcing steel is subjected to processing such as grinding, and the rust-proof state of the metal surface is maintained until concrete is poured again. It is ideal for repair work on objects, etc.

[Brief explanation of drawings]

Figure 1 shows a generator used for injecting the injection liquid for the fluid generator processing apparatus according to the present invention. It is a schematic diagram of 'cheating. 1-11-1 Hollow rotating body for supplying ultra-high pressure fluid, 2 Nozzle, 3 Nozzle holder, 41 Reinforced steel, 5 Concrete. Applicant: Kyoritsu Organic Industrial Research Institute Co., Ltd. Applicant: Kumagai Co., Ltd. Agent: Patent Attorney Kazumu Onaka

Claims (3)

[Claims] (1) 2 to 50 mol% anionic monomer units and 50
Dissolve 0.02 to 0.2% by weight of an acrylamide copolymer having mol % or more of acrylamide monomer units and having an intrinsic viscosity of 10 dl/g or more in 1N saline, and an organic polymer having 6 or more carbon atoms. An injection liquid for fluid jet processing equipment consisting of an aqueous solution in which 0.1 to 1% by weight of a basic acid radical is dissolved. (2) The injection liquid for a fluid jet processing device according to claim 1, wherein the organic dibasic acid group having 6 or more carbon atoms is a sebacic acid group and/or a dodecanedioic acid group. (3) The fluid jet according to claim 1, wherein the counter ion of the organic dibasic acid group having 6 or more carbon atoms is selected from diethanolamine, triethanolamine, diisopropanolamine, triisopropanolamine, or a mixture thereof. Injection liquid for processing equipment.