JP2006143847A - Coating preparation method and coating preparation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating preparation method and a coating preparation system enabling proper stirring and dispersion mixing in the preparation step without causing the entrainment of bubbles, achieving reduced cost and enabling easy washing of the system. <P>SOLUTION: The coating preparation system is provided with a preparation tank 2 for holding a coating raw material to be mixed and dispersed, a pump 3 sucking the coating raw material in the preparation tank 2 and ejecting into the coating raw material in the preparation tank 2 and a throttle 5 placed between the pump 3 and the ejection port 4 of the coating raw material. The stirring, mixing and dispersion of the raw material are carried out by placing the ejection port 4 at a position submerged in the coating raw material in the preparation tank. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a system and method for preparing a paint, and more particularly to a method and system for agglomerating a pigment paste, an additive, and the like into a paint liquid and stirring and dispersing and mixing in a preparation process.

Conventionally, in the production of paints, paddle blade type stirrers and high-speed dissolvers (also referred to as dispersers) are frequently used in the pre-kneading process and the blending process. However, paddle blade type stirrers and high-speed dissolvers entrain bubbles by vortex when the rotation speed of paddle blades and dissolver blades is increased. There is a problem that it is difficult to obtain the shearing force necessary for blending. For this reason, a homomixer (rotor / stator homogenizer) with less entrainment of bubbles is used instead of a high-speed dissolver or the like (see, for example, Patent Document 1).
JP-A-57-42324

  However, in order to change a high-speed dissolver etc. to a homomixer, the cost increases including the change of incidental electrical equipment, and there is a problem that the homomixer has poor cleaning properties.

  Therefore, an object of the present invention is to provide a paint blending method and a paint blending system which can be appropriately stirred and dispersed and mixed without involving bubbles in the blending process, which is advantageous in terms of cost, and easy to clean.

  In order to achieve the above object, the paint blending method according to the present invention is a method of charging a liquid paint raw material to be mixed and dispersed in a blend tank, sucking the paint raw material in the blend tank by a pump, and sucking it by the pump. Stirring and mixing / dispersing are performed by discharging the coating material from a discharge port submerged in the coating material in the preparation tank after passing through the flow restrictor.

  The pump may be installed outside the blending tank, and the raw material paint in the blending tank may be circulated between the external flow path and the blending tank via the pump. It may be submerged in the preparation tank. Moreover, you may add a coating material raw material to a preparation tank on the way, circulating through the said system.

  It is preferable that the average flow velocity in the flow restrictor is 5 to 100 m / s.

  In order to achieve the above object, a paint blending system according to the present invention includes a blend tank for storing paint raw materials to be mixed and dispersed, and a paint raw material in the blend tank by sucking the paint raw material in the blend tank. A position at which the discharge port is submerged in the coating material in the preparation tank, and a flow path throttle portion interposed between the pump and the coating material discharge port It is characterized by being arranged in.

  In the system, the pump is installed outside the mixing tank, the suction port of the pump is connected to the discharge port of the mixing tank, and the end of the circulation pipe connected to the discharge port of the pump is connected to the paint. It may be a raw material discharge port, and the flow passage restricting portion may be provided at the front end or halfway position of the circulation pipe, or in the case of water-based paint, the pump is a submersible pump and disposed in the preparation tank You may do it.

  The coating composition method and manufacturing system according to the present invention will be described below with reference to FIG. Note that. Throughout the drawings, the same components are denoted by the same reference numerals.

  FIG. 1 is a system diagram schematically showing a preferred embodiment of a paint blending system according to the present invention.

  The paint blending system 1 includes a blend tank 2 for storing paint raw materials to be mixed and dispersed, a pump 3 that sucks the paint raw materials in the blend tank 2 and discharges them into the paint raw materials in the blend tank 2, A flow passage restricting portion 5 interposed between the coating material discharge port 4 and the discharge port 4 is disposed at a position where the discharge material is submerged in the coating material in the preparation tank 2.

  In the illustrated example, the pump 3 is installed outside the mixing tank 2, the suction port of the pump 3 is connected to the discharge port 2 a of the mixing tank 2, and the tip of the circulation pipe 6 connected to the discharge port of the pump 3 is painted. It is immersed in the raw material. A flow restrictor 5 is interposed in the middle of the circulation pipe 6. The flow restrictor 5 can also be provided at the tip of the circulation pipe 6. As the pump 3, for example, a diaphragm pump can be used.

  Although not shown, in the case of water-based paint, the pump 3 can be a submersible pump and can be arranged in the preparation tank 2. In this case, for example, a flow path restricting portion can be connected to the discharge port of the submersible pump and submerged. The submersible pump can be fixed, for example, by providing a support member on the submersible pump and fixing the support member outside the mixing tank 2, or by providing a suction cup or the like on the submersible pump and adsorbing and fixing in the mixing tank 2. good.

The flow path restricting portion 5 can include a hole in which a plurality of flow paths are fitted in the flow direction. The form of the flow path restricting portion 5 is not particularly limited, such as a nozzle or an orifice, and any form can be used as long as the flow velocity can be increased.
The paint blending system 1 having the above configuration is used as follows.

  First, a liquid paint raw material to be mixed and dispersed is put into a preparation tank. The paints produced from the paint raw materials include water-based paints, oil-based paints, clear paints, and the like, and the paint raw materials charged into the preparation tank are raw materials that have already been subjected to a pre-kneading process and a dispersion process using a bead mill. The paint raw material used in the blending process is a pigment paste obtained in the dispersion process (a mixed paste in which secondary particles, which are aggregates of pigments, are dispersed and mixed into primary particles in a color developing agent and have a relatively high viscosity. ), A dispersion medium (also referred to as a color developing agent or a vehicle), an additive, and the like.

  After injecting a predetermined amount of coating material into the blending tank 2, the pump 3 is driven. The coating material in the mixing tank is sucked by the pump 3 and is pumped from the pump 3 to the circulation pipe 6. The coating material that is pumped through the circulation pipe 6 passes through the flow restrictor 5 interposed in the circulation pipe 6 and is then submerged in the coating material in the preparation tank 2. Erupts from 4.

  When the coating material is blown out from the discharge port 4, a stirring flow is generated in the preparation tank 2 and stirring is performed, and pigments and additives are dispersed.

  When the paint raw material (for example, 1 kL) is circulated for the required time (for example, 0.3 to 3 hours), the pigments and additives are atomized and the atomization ability is higher than that of the homomixer (rotor / stator type homogenizer). It was found that This is due to the fact that the coating material receives a shearing force when the coating material passes through the flow restrictor 5 at a high speed and collides with the coating material when it is ejected from the flow restricting unit 5. it is conceivable that.

  Such an atomization effect is an important factor in the average flow velocity in the flow restrictor 5. The flow rate suitable for atomization is 2 m / s or higher, preferably 5 m / s or higher. The faster the average flow velocity in the flow restrictor 5 is, the better.

  In addition, in order to obtain a flow rate necessary for the above-mentioned atomization effect in the viscosity range (0.001 to 10 Pa · s) of the coating material that is normally processed, the minimum pore diameter of the flow restrictor 5 is set to 0.3 to 30 mm. It is preferable that

  If necessary, large blades such as paddle blades rotating at a low speed that does not entrain bubbles by vortexing may be disposed in the mixing tank 2.

  The above system can exhibit performance equal to or better than that of conventional devices by combining relatively inexpensive equipment such as a pump, a flow restrictor, and piping. Dispersion of paint can also be done efficiently. In addition, a simple assembly operation such as connecting the suction port of the pump 3 to the discharge port normally provided in the mixing tank 2 and submerging the tip of the pipe connected to the discharge port of the pump in the mixing tank. The existing equipment can be used as it is. Further, the above system can be cleaned simply by flowing the cleaning liquid through the pump into the flow restrictor and the pipe, so that cleaning is easy.

1 is a system diagram schematically showing a preferred embodiment of a paint blending system according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paint blending system 2 Blending tank 3 Pump 4 Discharge port 5 Flow path restricting part 6 Circulation piping

Claims (11)

The liquid paint raw material to be mixed and dispersed is put into the preparation tank, the paint raw material in the preparation tank is sucked by a pump, and the paint raw material sucked by the pump is passed through the flow restrictor, and then the preparation A paint blending method comprising stirring and mixing and dispersing by discharging from a discharge port submerged in a paint raw material in a tank. The paint blending method according to claim 1, wherein the pump is installed outside the blending tank, and the raw material paint in the blending tank is circulated through the external flow path and the blending tank via the pump. The paint preparation method according to claim 1, wherein the pump is submerged in the preparation tank. The paint blending method according to any one of claims 1 to 3, wherein an average flow velocity of the flow restrictor is 5 to 100 m / s. The paint preparation method according to claim 1, wherein the paint raw material is an aqueous paint raw material. 5. The paint blending method according to claim 1, wherein the paint raw material is an oil-based paint raw material. A mixing tank for containing the coating material to be mixed and dispersed, a pump for sucking the coating material in the mixing tank and discharging it into the coating material in the mixing tank, and between the pump and the coating material discharge port And a flow passage restricting portion interposed in the coating tank, wherein the discharge port is disposed at a position where the discharge port is submerged in the coating material in the mixing tank. The pump is installed outside the mixing tank, the suction port of the pump is connected to the discharge port of the mixing tank, and the tip of the circulation pipe connected to the discharge port of the pump is connected to the discharge port of the paint material The paint blending system according to claim 7, wherein the flow passage restricting portion is provided at a front end portion or an intermediate position of the circulation pipe. The paint blending system according to claim 7, wherein the pump is a submersible pump and is disposed in the blending tank. The paint blending system according to any one of claims 7 to 9, wherein the flow restrictor is formed by a plurality of orifices. The paint preparation system according to any one of claims 6 to 10, wherein a minimum hole diameter of the flow passage restricting portion is 0.3 to 30 mm.

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