JP2010172436A - Washing and drying machine, heat insulation coating for outer tub of the same, and coating method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a washing and drying machine capable of reducing power consumption by having a heat insulation coating excellent in hydrophilicity, adherability to an outer tub, toughness, or the like in excellent balance on the inner surface of the outer tub. <P>SOLUTION: In the washing and drying machine provided with the outer tub 20 made of polypropylene for accumulating washing water and having a rotary drum placed in the inside thereof, the film 40 of the heat insulation coating containing a polyolefin resin, hollow beads and white pigments is provided on the inner surface of the outer tub 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a washing and drying machine that can be used from washing to drying, a heat insulating paint for an outer tub of the washing and drying machine, and a coating method thereof.

2. Description of the Related Art Conventionally, a washing / drying machine capable of performing from washing to drying is widely known (for example, see Patent Document 1). This washing and drying machine is configured to dry laundry that has been washed and rinsed in a rotating drum disposed inside the outer tub with hot air fed through the outer tub after dehydrating the rotating drum. Has been. In recent years, there has been a demand for a washing / drying machine that consumes less power than ever before due to demands for energy saving and low environmental load.
On the other hand, for the purpose of reducing power consumption, a clothes dryer in which a heat insulating paint is applied to a rotating drum is known (for example, see Patent Document 2). This clothes dryer reduces heat consumption by preventing heat dissipation from the rotating drum during drying.
Therefore, it is conceivable to reduce power consumption in a washing and drying machine, for example, by applying a heat insulating paint to the rotating drum. Incidentally, as the heat insulating paint, generally, those containing hollow beads and a binder are mentioned. As the binder, acrylic resin, epoxy resin, and urethane resin are known (for example, Patent Document 3 to Patent Document 5). reference).

JP 2008-125804 A JP 2000-14997 A JP 2002-105385 A JP 2003-326623 A JP 2004-251108 A

  However, the rotary drum of the laundry dryer is different from the rotary drum of the clothes dryer described above, and is exposed to washing water containing chemicals such as detergents, bleaches, and softeners, and the laundry in the presence of the washing water. Rub with each other. Therefore, even if a film of a conventional heat insulating paint (see, for example, Patent Document 3 to Patent Document 5) is applied to the rotating drum of the washing dryer, the film may be peeled off from the rotating drum during washing.

  Therefore, it is also conceivable to apply a heat insulating paint to at least the outer tub that does not rub against the laundry. However, since the outer tub of the washing and drying machine is generally formed of a resin (for example, polypropylene resin), the conventional heat insulating paint (for example, see Patent Document 3 to Patent Document 5) has adhesion to the outer tub. bad. In particular, for those containing an emulsion resin, which is widely known as a heat insulating paint, the water resistance of the resulting film is relatively good, but the components of the film are dispersed in washing water containing a detergent (surfactant). The film may disappear.

  In addition, even if a heat insulating coating is applied to the surface of the outer tub after performing a known surface treatment such as corona discharge treatment, flame treatment, plasma treatment, ultraviolet irradiation treatment, primer coating treatment, etc., the surface treatment layer and the heat insulating paint There is a risk that the washing water will permeate between the two coatings and the coating will peel off from the outer tub.

  Accordingly, an object of the present invention is to provide a washer-dryer that can achieve a reduction in power consumption by having a coating of a heat-insulating paint excellent in durability on the inner surface of the outer tub, and a heat-insulating paint for an outer tub of the washer / dryer And a method of painting the same.

The washing and drying machine of the present invention that solves the above-mentioned problems is a washing and drying machine that has an outer tub made of polypropylene in which washing water is stored and a rotating drum is placed, and a polyolefin resin, hollow beads, and a white pigment are formed on the inner surface of the outer tub. And a film of a heat insulating paint containing
And the heat insulation coating material for the outer tub of the washing dryer which solves the said subject contains polyolefin resin, a hollow bead, and a white pigment, It is characterized by the above-mentioned.
And the coating method of the heat insulating paint for the outer tub of the washing / drying machine which solves the above-mentioned problem is the heat insulating paint for the outer tub comprising polyolefin resin, hollow beads and white pigment on the surface of the polypropylene outer tub in the washing / drying machine. A film forming step of forming a film of the heat-insulating paint by coating the film, and a film heating step of heating the film at a temperature higher than the temperature at which the polyolefin resin melts. Forming a film of the heat insulating paint by applying a heat insulating paint for the outer tank containing a polyolefin resin, a hollow bead having a hydrophilic surface, and a white pigment on the surface of the outer tank, A polishing step of polishing the surface to expose the surface of the hollow beads.

  ADVANTAGE OF THE INVENTION According to this invention, it has the coating film of the heat insulating paint excellent in durability on the inner surface of an outer tub, and can achieve reduction of power consumption, the heat insulating paint for outer tubs of a washing drier, and its A painting method can be provided.

1 is a perspective view of a washing / drying machine according to an embodiment of the present invention. It is side surface sectional drawing of the washing-drying machine which concerns on embodiment of this invention. It is sectional drawing which shows typically the membrane | film | coat of the heat insulation coating provided in the inner surface of the outer tank of the washing / drying machine shown in FIG.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. Here, description will be made in the order of a washing / drying machine, a heat insulating paint for an outer tub of the washing / drying machine (hereinafter, simply referred to as “heat insulating paint”) and a coating method thereof.

(Washing and drying machine)
As will be described later, the washing / drying machine of the present invention is mainly characterized in that the inner surface of the outer tub is provided with a film of a heat insulating paint containing a polyolefin resin, hollow beads, and a white pigment. First, the overall configuration of the washing / drying machine of the present invention will be described.

  As shown in FIG. 1, an oblique drum type washing / drying machine L according to the present embodiment has an outer frame 2 formed by combining a steel plate and a resin molded product on the upper part of a base 1. The front side of the outer frame 2 is provided with a door 3 for loading and unloading the laundry 30, a front cover 22 and a back cover 23 on the back. In FIG. 1, the code | symbol 9 is a drainage hose.

  As shown in FIG. 2, an outer tub 20 made of polypropylene (PP) is disposed inside the outer frame 2. The outer tub 20 is supported by a plurality of lower suspensions 21. The rotating drum 29 inside the outer tub 20 has the laundry 30 put in with the door 3 opened, and the outer periphery of the opening of the rotating drum 29 reduces vibration due to unbalance of the laundry 30 during dehydration. A fluid balancer 31 is provided.

  Inside the rotary drum 29, a plurality of lifters 33 for lifting the laundry 30 are provided. The rotating drum 29 is directly connected to a drum driving motor 36 via a main shaft 35 connected to a rotating drum metal flange 34. A rubber packing 38 made of an elastic body is attached to the opening of the outer tub 20. The packing 38 serves to maintain the watertightness between the outer tub 20 and the door 3. This prevents water leakage during washing, rinsing and dehydration. The rotating drum 29 has a large number of small holes (not shown) for centrifugal dehydration and ventilation on the side wall. A drainage port 37 opened in the bottom wall of the outer tub 20 is connected to the drainage hose 9 via the drainage valve 8.

  A drying device including a dehumidifying duct 5 for drying the laundry 30 in the rotating drum 29, a fan 61 as a blowing means, and a heater 62 as a heating means is fixed to the outer frame 2 apart from the outer tub 20. The dehumidifying duct 5 and the ventilation port 32 are connected substantially horizontally by a bellows 4 having a flexible structure. The outlet of the heater 62 and the blowout nozzle 11 are connected to the outer tub 20 approximately perpendicularly by a bellows 7 having a flexible structure between the uppermost surface and the center of the outer tub 20 and in front of the center of the outer tub 20. . These bellows 4 and 7 absorb the vibration of the outer tub 20. Temperature sensors (not shown) are provided at the drain port 37 and the intake and discharge ports of the fan 61.

Next, the operation of the washing / drying machine L will be described. In the washing process, when the laundry 30 is put into the rotating drum 29, the washing / drying machine L supplies water with the drain valve 8 closed, stores the washing water in the outer tub 20, and rotates the rotating drum 29. Then, the laundry 30 is washed.
The water supply is performed via a detergent tray (not shown). Incidentally, a detergent, a bleaching agent, a softening finish and the like are put into the detergent tray at a predetermined timing corresponding to washing and rinsing performed in the washing process.

  In the dehydration step, the drain valve 8 is opened to drain the washing water in the outer tub 20, and the rotary drum 29 is rotated to perform centrifugal dehydration.

  From the first half of the drying process to the middle stage, the rotary drum 29 is rotated with the drain valve 8 open. Then, the fan 61 is operated to suck out the air in the outer tub 20 from the air vent 32 and pass through the dehumidifying duct 5 to perform water cooling dehumidification. Then, the circulating air 12 which heats with the heater 62 and blows toward the laundry 30 in the rotating drum 29 from the blowing nozzle 11 is produced | generated.

The dehumidification of the circulating air 12 that has taken moisture from the laundry 30 in the rotary drum 29 is performed by opening a cooling water valve (not shown) and dehumidifying duct 5 from the cooling water supply pipe 51 (showing an opening in FIG. 2). The cooling water 52 that has flowed out to the inner wall surface is caused to flow down and brought into contact with the circulating air 12. The cooling water 52 that has flowed out to the wall surface in the dehumidifying duct 5 passes through the drain port 37 and is discharged by the drain hose 9.
The intake valve 13 provided in the dehumidification duct 5 in the middle stage from the first half of this drying process is closed so that the external air 16 described later does not flow into the dehumidification duct 5.

  Next, in the latter half of the drying process, the heater 62 is turned off and the cooling water 52 is stopped. In FIG. 2, by opening the intake valve 13 as indicated by a broken line, the external air 16 indicated by a one-dot chain line sucked from the gap at the bottom of the base 1 flows along the side surface of the outer tank 20 while the outer tank 20 and the drum Heated by the exhaust heat of the drive motor 36 and the fan 61. The warmed external air 16 is sucked into the fan 61 together with the high-temperature housing internal air accumulated in the upper surface of the outer tub 20 and the space of the outer frame 2 until the middle of drying.

  The external air 16 accompanied by exhaust heat is blown onto the laundry 30 and deprives the laundry 30 of moisture. As shown in FIG. 2, the external air 16 that has passed through the drainage port 37 passes through the drainage hose 9, breaks the water seal (not shown) of the drainage trap 10, and is discharged to the drainage port 39. In the case of a general drain trap 10, since the height of the water seal is about 50 to 80 mm, the pressure on the drain hose 9 side is required to be about 1000 Pa or more to break the water seal. Moreover, in order to suppress the odor from the drain port 39, it is necessary to ensure a high pressure (pressure higher than a predetermined pressure) even after the water seal is broken, so that a high pressure is maintained during the exhaust-type drying by the drain hose 9. The fan 61 is controlled.

  After the drying is completed, the rotation speed of the fan 61 is lowered to a pressure level that does not break the water seal while keeping the pressure on the drain hose 9 side higher than the pressure on the drain port 39 side, and the cooling water 52 is flown to the water in the drain trap 10. The sealing is restored and the drying process is completed.

  In this way, after the drying is completed, the drain trap 10 is provided while suppressing the odor from the drain port 39 by supplying water to the drain port 39 through the drain hose 9 while maintaining the pressure on the drain hose 9 side at a predetermined level or more. The water seal can be restored.

  As described above, the washing / drying machine L according to the present embodiment includes a coating of a heat insulating paint containing polyolefin resin, hollow beads, and white pigment on the inner surface of the outer tub 20 shown in FIG.

  As shown in FIG. 3, the film 40 formed on the surface of the outer tub 20 mainly includes a polyolefin resin 43 as a matrix (binder), hollow beads 41, and a white pigment 42. The thickness of the film 40 is desirably 20 μm to 2000 μm, and more desirably 20 μm to 700 μm. The film 40 having such a thickness improves the heat insulation effect, the adhesion to the surface of the outer tub 20, and the toughness in a well-balanced manner.

  Further, although not shown, the coating 40 is more preferably formed to a thickness of about 10 times the particle size from the same thickness as the particle size of the hollow beads 41 described later.

  And the surface of the hollow bead 41 is exposed to the surface of the membrane | film | coat 40 in this embodiment. That is, the surface of the coating 40 is enhanced in water wettability by exposing the hollow beads 41 having hydrophilicity to the polyolefin resin 43 having water repellency in a sea-island shape. Specifically, the surface of the hollow beads 41 is exposed so that the contact angle of water on the surface of the film 40 is 20 degrees or less.

In addition, as shown in FIG. 3, the coating 40 in this embodiment has a dense distribution of the hollow beads 41 with respect to the polyolefin resin 43 near the surface of the coating 40, and the hollow beads 41 near the interface between the coating 40 and the outer tank 20. It is more desirable that the distribution of 41 is sparse (the polyolefin resin 43 is densely distributed).
Such a film 40 is formed by applying a heat insulating paint described below to the inner surface of the outer tub 20.

(Insulation paint)
Next, the heat insulating paint of the present invention will be described.
The heat insulating paint includes a polyolefin resin 43 (hereinafter, the reference may be omitted), hollow beads 41 (hereinafter, the reference may be omitted), and a white pigment 42 (hereinafter, the reference may be omitted). It is out.
Examples of the polyolefin resin include polypropylene, polyethylene, polybutene, other C5 α-olefin polymers, poly (4-methylpent-1-ene), ethylene-propylene copolymer, propylene-butene copolymer, Ethylene-propylene-butene terpolymers, other α-olefin copolymers, copolymers of α-olefins with 50% or less of other monomers (for example, ethylene-vinyl acetate copolymers, ethylene- Polyolefins such as ethyl acrylate copolymers, ethylene-maleic anhydride copolymers, ethylene-ethyl acrylate-maleic anhydride terpolymers, and the like, and chlorinated polyolefin resins that are chlorinated compounds of these polyolefins Can be mentioned. Among them, chlorinated polyethylene resin, chlorinated polypropylene resin, and chlorinated polybutene resin are preferable because adhesion between the inner surface of the outer tank 20 made of polypropylene and the coating 40 is further improved, and chlorinated polypropylene resin is particularly preferable.
In addition, it is desirable that the chlorine content of the chlorinated polyolefin resin is set to 34% by mass or less because adhesion between the inner surface of the outer tub 20 and the coating 40 is further improved.
As such a polyolefin resin, a resin having a weight average molecular weight (Mw) of 50000 or more is desirable because it improves the durability of the film 40 by a detergent, a bleaching agent, contact, or the like.
Further, when a polyolefin resin having a weight average molecular weight (Mw) of 70000 or less is used, a heat insulating paint suitable for application by atomization (spray) can be easily prepared.
Desirably, the polyolefin resin has a melting point higher than 50 ° C. In addition, since the polyolefin resin having a melting point higher than 70 ° C. can set the temperature of the above-described drying process high, the drying conditions according to the drying time setting in the laundry dryer L and the thickness of the laundry 30 are different depending on whether the laundry is thick or thin. This is desirable because the degree of freedom of mode setting such as setting is expanded. The polyolefin resin is preferably lower than the heat distortion temperature (150 ° C.) of the polypropylene resin constituting the outer tub 20.

  The hollow beads have cavities in a thin shell and are generally called balloons. A gas (typically air) is enclosed in the cavity, but may be reduced in pressure or vacuum. Inorganic balloons and resin balloons are known depending on the material of the shell. In the present invention, inorganic balloons are preferably used. The inorganic balloon is desirable because its surface is rich in hydrophilicity and excellent in mechanical strength. Here, the “hollow beads whose surface is rich in hydrophilicity” corresponds to “hollow beads having a hydrophilic surface” in the claims, and as described above, the surface of the hollow beads is formed on the surface of the film 40. Means that the contact angle of water on the surface of the film 40 can be set to 20 degrees or less. Incidentally, the polyolefin resin that is the matrix of the film 40 is water-repellent, and the contact angle of water is 90 degrees or more.

Examples of such inorganic balloons include glass balloons, shirasu balloons, alumina balloons, zirconia balloons, aluminum silicate balloons, etc., and these may be used alone or in combination of two or more. Also good. Among these, hollow ceramic balloons such as aluminum silicate balloons are particularly desirable.
In addition, as long as it has a predetermined hydrophilicity and mechanical strength, the hollow beads are not limited to the above-described inorganic balloons, and resin balloons can also be used.
The particle size of the hollow beads is not particularly limited as long as the problem of the present invention is not hindered, and may be about 20 μm to 70 μm.

Examples of white pigments include metal oxides such as titanium dioxide, zinc oxide, magnesium oxide, and calcium carbonate. Among these, titanium dioxide is preferable because it is excellent in the hiding power of the color of the outer tub 20 as a base. Titanium dioxide can be used in both anatase type and rutile type, but the rutile type is more preferable because it has excellent hiding power for the base.
Moreover, in order to improve the dispersibility, the white pigment may be one whose surface is coated with aluminum, silicon or the like as long as the problem of the present invention is not impaired.
The particle size of the white pigment is not particularly limited as long as the problem of the present invention is not impaired, and may be about 0.15 μm to 0.4 μm.

  The blending amount of the polyolefin resin, hollow beads and white pigment in the heat insulating coating may be set so that the hollow beads are 50 to 150 parts by mass and the white pigment is 10 to 100 parts by mass with respect to 100 parts by mass of the polyolefin resin. desirable. The heat-insulating paint prepared with such a blending amount can obtain the coating film 40 in which the heat-insulating effect, the adhesion to the surface of the outer tub 20 and the toughness are improved in a well-balanced manner.

  Such a heat insulating paint can be prepared by mixing hollow beads and a white pigment in a binder solution in which a polyolefin resin is dissolved in a solvent. That is, the heat insulating paint in this embodiment is a solvent heat insulating paint in which a matrix (binder) is dissolved in a solvent, unlike a so-called emulsion heat insulating paint in which a resin serving as a matrix of the heat insulating film is dispersed.

  Examples of the polyolefin resin solvent include aromatic solvents such as toluene and xylene, ketones such as acetone and methyl ethyl ketone, aliphatic solvents such as n-pentane and hexane, and alicyclic systems such as cyclohexane and methylcyclohexane. Solvents, ester solvents such as ethyl acetate and butyl acetate, and chlorinated carbon solvents such as dichloromethane and propane dichloride can be used. The usage-amount of a solvent is suitably set so that it may become suitable for handling of a heat insulation coating material.

  The hollow beads and the white pigment may be directly mixed with the above-described binder solution, or a dispersion of the hollow beads and the white pigment may be mixed with the binder solution. As the dispersion medium for the hollow beads and the white pigment, the same polyolefin resin as the solvent can be used. In addition, you may add a well-known dispersing agent to the dispersion liquid of a hollow bead and a white pigment.

(How to apply thermal insulation paint)
Next, the coating method of the present invention will be described. The coating method in this embodiment includes a film forming step of forming the above-described heat-insulating coating film 40 (see FIG. 3, the same below) on the inner surface of the outer tub 20 (see FIG. 2, the same below), and this coating 40. And a polishing process for polishing the surface of the film 40. The polishing process may be performed after the film heating process, may be performed before the film heating process, or may be performed both before and after the film heating process. It is desirable to carry out both before and after the film heating step.

In the film forming step, the heat insulating paint is applied to the inner surface of the outer tub 20 by spraying or brushing. At this time, it is desirable to apply the heat insulating coating so that the dry thickness is about 20 μm to 2000 μm, and a more desirable coating thickness is about 20 μm to 700 μm.
Next, in the film formation step, the film 40 is formed on the inner surface of the outer tub 20 by drying the applied heat insulating paint. The insulating paint may be air dried. Alternatively, the heat insulating paint may be dried by blowing air to the inner surface of the outer tub 20 at room temperature.

  In the film heating step, the film 40 is heated at a temperature equal to or higher than the melting temperature of the polyolefin resin (above the melting point). Specifically, for example, when the polyolefin resin is a chlorinated polyethylene resin, it is desirable to heat at 80 ° C. or higher. The heating temperature is desirably set to a temperature lower than the heat deformation temperature of the polypropylene resin constituting the outer tub 20, and specifically, desirably set to 155 ° C. or lower. In this film heating step, the polyolefin resin, which is a constituent component of the film 40, can be welded to the inner surface of the outer tub 20, so that the adhesion of the film 40 can be further increased.

In the polishing step, the surface of the coating 40 is polished, so that the surface is partially exposed like the hollow beads indicated by reference numeral 41 in FIG. This polishing step may be performed manually using an abrasive material such as water sharpening paper, or may be performed using a tool such as an air or electric orbital sander or straight sander.
In this polishing step, as described above, the hydrophilicity (wetting with respect to water) of the surface of the coating 40 is improved by exposing the surface of the hollow beads. In this polishing step, the polyolefin resin protruding from between the hollow beads on the surface of the coating 40 is removed. As a result, the curved surface of the hollow beads is exposed in an island shape with the flattened polyolefin resin as the sea. As a result, the fibers separated from the laundry 30 (see FIG. 2) are effectively prevented from tangling and adhering to the surface of the film 40.

According to the washing / drying machine L concerning this embodiment as mentioned above, there can exist the following effects.
In this washing / drying machine L, since it has the film 40 formed of the heat insulating paint on the inner surface of the outer tub 20, for example, compared with the one having the film formed of the heat insulating paint on the outer surface of the outer tub 20. The atmosphere in the outer tub 20 can be effectively insulated without being affected by the heat capacity of the outer tub 20. As a result, according to this washing / drying machine L, it is possible to achieve further reduction in power consumption in the above-described drying process as compared with the conventional washing / drying machine.

  Moreover, in this washing / drying machine L, since the matrix of the film 40 is made of a polyolefin resin, the outer tub 20 can be used even in a harsh environment where it is exposed to washing water containing chemicals such as detergents, bleaches and softeners. Adhesion with the inner surface of is excellent. Further, unlike conventional heat insulating paints (for example, see Patent Document 3 to Patent Document 5), the inner surface of the outer tub 20 is publicly known, for example, corona discharge treatment, flame treatment, plasma treatment, ultraviolet irradiation treatment, primer coating treatment, etc. Since it is not necessary to apply the heat-insulating paint after the surface treatment, there is no possibility that the washing water permeates between the surface-treated layer and the heat-insulating paint film 40 and the film is peeled off from the outer tub.

  Further, in this washer / dryer L, unlike the conventional emulsion-based heat insulating paint (see, for example, Patent Document 3 to Patent Document 5), a film 40 formed of a solvent-based heat insulating paint is applied to the inner surface of the outer tub 20. Therefore, the components of the film 40 are not dispersed in the washing water containing the detergent (surfactant) and the film 40 is not lost.

  Further, in this washer / dryer L, since the surface of the hydrophilic hollow beads is exposed on the surface of the film 40, the surface of the film 40 is hydrophilic even though the matrix of the film 40 is a water-repellent polyolefin resin. It has come to show. As a result, according to this washing / drying machine L, the water film adhering to the surface of the film 40 spreads and the thermal efficiency for evaporation becomes good. As a result, the power consumption can be further reduced as compared with the conventional washing and drying machine.

  Moreover, in this washing / drying machine L, the curved surface of the hollow bead is exposed in an island shape by using the flattened polyolefin resin as the sea by the polishing process of the film 40 as described above. As a result, the distribution (volume ratio) of the polyolefin resin on the surface portion of the coating 40 is reduced. Therefore, according to this washing / drying machine L, in addition to the heat insulation reflection effect by the hollow beads contained in the film 40, the heat capacity of the polyolefin resin on the surface of the film 40 is reduced. Improves drying properties. That is, the power consumption can be further reduced as compared with the conventional washing and drying machine.

  Moreover, in this washing / drying machine L, since the white pigment is contained in the film | membrane 40, the heat dissipation through the outer tank 20 is prevented by the reflective effect. As a result, the power consumption can be further reduced as compared with the conventional washing and drying machine.

Further, in this washing / drying machine L, unlike the conventional emulsion-based heat insulating paint (for example, see Patent Document 3 to Patent Document 5), a film 40 formed of a solvent-based heat insulating paint is provided on the inner surface of the outer tub 20. Therefore, the components of the film 40 are not dispersed in the washing water containing the detergent (surfactant) and the film 40 is not lost. Incidentally, the solvent-based heat-insulating paint containing the polyolefin resin of the present invention can further reduce the thickness of the film 40 as compared with the conventional one, and as described above, the heat-insulating effect and the adhesion to the surface of the outer tank 20 In addition to improving the balance and toughness, the dimensional accuracy on the layout of the outer tub 20 can be further improved.
And according to this washing / drying machine L, unlike the conventional heat insulation board formed, for example with a phenol resin foam, a polyethylene resin foam, a polyurethane resin foam, a polystyrene resin foam, glass wool etc., the very thin membrane | film | coat 40 is formed in the outer tub 20 Since the heat insulating property can be imparted by forming the same, a large volume in the rotary drum 29 in the washing / drying machine L can be secured. As a result, according to the present invention, it is possible to provide a washing / drying machine L having a large washing capacity, large drying capacity, and the like.

  As described above, according to the washing / drying machine L of the present invention, it is possible to achieve a reduction in power consumption by having the heat-insulating coating film 40 excellent in durability on the inner surface of the outer tub 20. And according to the heat insulation coating material for outer tubs and its coating method of this invention, the washing-drying machine L which show | plays an above-described effect can be provided.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, It can implement with a various form.

  In the above-described embodiment, the oblique drum type washing / drying machine L has been described. However, the present invention may be applied to a vertical drum type washing / drying machine.

Moreover, although the said embodiment demonstrated the washing-drying machine L provided with the membrane | film | coat 40 on the inner surface of the outer tub 20, this invention is the outer surface of the outer tub 20, the rotating drum 29 (refer FIG. 2), the dehumidification duct 5 (FIG. The film 40 may be formed on a member located in the heat supply path such as 2).
At this time, the dehumidifying duct 5 and the portion near the rotating drum 29 where the air flow is fast can be configured to increase water repellency and easily discharge water droplets. That is, in these portions, the coating 40 may be made to maintain water repellency without subjecting the coating 40 to the polishing step described above.

Next, the present invention will be described more specifically with reference to examples. In the following examples, “part” represents part by mass.
Example 1
In Example 1, the heat insulating paint prepared as follows was applied to the inner surface of the outer tub 20 of the washing and drying machine L shown in FIG.
First, 788 parts of methylcyclohexane and 388 parts of butyl acetate are mixed here, and Super Clon (registered trademark) 892LS (Nippon Paper Chemical Co., Ltd., weight average molecular weight (Mw)) 50000- 70,000, melting point 80 ° C. to 90 ° C., chlorine content 21 to 23% by mass) was added and stirred, and completely dissolved to prepare a binder solution.

  On the other hand, to 669 parts of methylcyclohexane, 7 parts of ANTI-TERRA-P (manufactured by BYK CHEMIE) as a dispersant is added and R-62N (manufactured by Sakai Chemical Industry Co., Ltd., average particle size 0) .26 μm) 74 parts was added, and dispersion treatment was performed with a ball mill for 12 hours to prepare a white pigment dispersion.

Then, 70 parts of E-SPHERES SL75 (aluminum silicate balloon made by Taiheiyo Cement Co., Ltd.), which is a hollow bead, is added with stirring while mixing the prepared binder solution and the white pigment dispersion, followed by further stirring for 20 minutes. A heat insulating paint in which the white pigment and the hollow beads were dispersed in the binder solution was prepared.
The composition of E-SPHERES SL75, SiO ₂ is 59.7 wt%, _Al 2 _{O 3} is 38.3 wt%, _Fe 2 _{O 3} is 0.4 wt%, CaO 0.2 wt%, TiO ₂ was 1.09% by mass.

  Next, the prepared heat-insulating paint was pumped to a spray gun LPH-200 122P (manufactured by Anest Iwata) while being stirred and applied to the inner surface of the outer tub 20. The thickness of the applied heat insulating paint was adjusted so as to be 200 μm to 700 μm in dry thickness. And the membrane | film | coat 40 was formed in the inner surface of the outer tank 20 by volatilizing the organic solvent by natural drying by the applied heat insulation coating material.

  Next, by heating the outer tub 20 on which the film 40 was formed, a chlorinated polyolefin resin as a constituent component of the film 40 was welded to the inner surface of the outer tub 20. Heating was performed for 30 minutes in an atmosphere in which the substrate temperature (the temperature of the outer tub 20) was 90 ° C. in a warm air drying furnace.

Next, the surface of the film 40 was polished by applying water to the surface of the film 40 while sliding a water-polished paper sheet (manufactured by Sumitomo 3M, 600A) while pressing. As a result, the surface of the hollow beads was partially exposed on the surface of the film 40. The pressing force of the water sharpening paper sheet at this time ^was set to ^{10g / cm 2 ~50g / cm 2} .
By this polishing step, the surface of the film 40 has a water contact angle of 20 ° or less (hydrophilicity).

Next, the durability of the obtained film 40 was evaluated. Here, the washing and drying machine L including the outer tub 20 on which the film 40 was formed was used to repeat the washing process, the dehydration process, and the drying process 1000 times, and then the state of the film 40 was visually observed. By the way, in the washing process, 44 mL of liquid attack (registered trademark) (made by Kao Corporation, synthetic detergent for washing, weak alkaline, polyoxyethylene alkyl ether surfactant) as a detergent is added per 30 L of washing water and bleached. 70 mL of HAYTER (registered trademark) (manufactured by Kao Corporation, containing chlorine bleach, alkaline, sodium hypochlorite) as an agent was added per 30 L of washing water.
The evaluation results are “◎” when the film 40 is in a very good state when compared with a film formed with a conventional heat insulating paint (acrylic resin emulsion heat insulating paint) as a standard, and “ “○”, and “×” is the same as the conventional thermal insulation paint. The results are shown in Table 1.

Next, the adhesion, detergent resistance and bleach resistance of the film 40 were evaluated. In these evaluations, a plate body made of the same material as that of the outer tub 20 is prepared, and the film 40 is formed on the plate body, heated, and polished as a test piece as described above. did.
Evaluation of adhesion is performed by a cross-cut test method in accordance with JIS-K-5600. After forming a grid-like cut on the film 40 of the test piece, a cellophane tape is applied to this and then peeled off. The state of the film 40 was visually observed.
The evaluation result is “◎” when the film 40 is in a very good state when compared with a test piece in which the film is formed with a conventional heat insulating paint (acrylic resin emulsion heat insulating paint) as a reference. “○” was given, and “X” was given to those equivalent to conventional heat-insulating paints. The results are shown in Table 2.

Detergent resistance was evaluated by maintaining a stock solution of Liquid Attack (registered trademark) as a detergent (manufactured by Kao Corporation, synthetic detergent for washing, weak alkalinity, polyoxyethylene alkyl ether surfactant) at 60 ° C. The test piece was immersed for 240 hours. And what dried after wash | cleaning the test piece taken out from the detergent with tap water was used for evaluation. Here, after forming a lattice-like cut on the film 40 of the test piece by the cross-cut test method based on JIS-K-5600, a cellophane tape is applied to the film 40 and then the film 40 is peeled off. The state was observed visually.
The evaluation result is “◎” when the film 40 is in a very good state when compared with a test piece in which the film is formed with a conventional heat insulating paint (acrylic resin emulsion heat insulating paint) as a reference. “○” was given, and “X” was given to those equivalent to conventional heat-insulating paints. The results are shown in Table 2.

Evaluation of bleaching resistance was performed by maintaining a stock solution of HYTER (registered trademark) (made by Kao Corporation, chlorine bleaching agent, alkaline, sodium hypochlorite) as a bleaching agent at 60 ° C. Soaked for 240 hours. And what dried after wash | cleaning the test piece taken out from the detergent with tap water was used for evaluation. Here, after forming a lattice-like cut on the film 40 of the test piece by the cross-cut test method based on JIS-K-5600, a cellophane tape is applied to the film 40 and then the film 40 is peeled off. The state was observed visually.
The evaluation result is “◎” when the film 40 is in a very good state when compared with a test piece in which the film is formed with a conventional heat insulating paint (acrylic resin emulsion heat insulating paint) as a reference. “○” was given, and “X” was given to those equivalent to conventional heat-insulating paints. The results are shown in Table 2.

(Example 2)
In Example 2, the following heat insulating paint was used.
In the preparation of the heat insulating paint, HARDLEN (registered trademark) CY-9124 (made by Toyo Kasei Kogyo Co., Ltd., chlorinated polyolefin resin solution (binder solution), 20% by mass of dry solid content of chlorinated polyolefin resin, 80% by mass of toluene, FUJI SL WHITE 1035, which is a white pigment dispersion, is added to 500 parts of a weight average molecular weight (Mw) of chlorinated polyolefin resin (Mw) 50000 to 70000, melting point 75 to 85 ° C. of chlorine content 23 to 26 mass%). E-SPHERES SL75 which is a hollow bead while adding 137 parts of 50% by mass of titanium dioxide, 45% by mass of methylcyclohexane, 5% by mass of a dispersion resin, and an average particle size of titanium dioxide of 0.22 μm) manufactured by Fuji Color Co., Ltd. (Same as Example 1) 65 parts and 300 parts of toluene which is an organic solvent Additionally By stirring 20 minutes, the white pigment and hollow beads were prepared insulation coating dispersed in a binder solution.
And except having used this heat insulation paint, the film | membrane 40 was formed in the inner surface of the outer tank 20 similarly to Example 1, this film | membrane 40 was heated, and this film | membrane 40 was polished. By this polishing step, the surface of the film 40 has a water contact angle of 20 ° or less (hydrophilicity).

  Next, the film 40 was evaluated in the same manner as in Example 1 for durability, adhesion, detergent resistance, and bleach resistance. The results are shown in Tables 1 and 2.

(Example 3 to Example 6)
In Example 3 to Example 6, in place of the chlorinated polyolefin resin of Example 1, the heat insulating paint containing the chlorinated polyolefin resin having the weight average molecular weight (Mw) shown in the following Table 1 was used. A heat insulating paint was prepared in the same manner as in 1.
Of the chlorinated polyolefin resins in Table 1, Supercron (registered trademark) 803LS, Supercron (registered trademark) 802S, Supercron (registered trademark) 833S, and Supercron (registered trademark) 814HS are Nippon Paper Chemicals. This is a chlorinated polyolefin resin manufactured by the company.
Next, each heat insulating paint prepared in Examples 3 to 6 was applied to the inner surface of the outer tub 20.
As shown in Table 1, in Example 3 using a chlorinated polyolefin resin having a weight average molecular weight (Mw) of 190,000 or more, the heat-insulating paint has a high viscosity and is difficult to apply with a spray gun (the spray in Table 1). The evaluation result of ease was “×”), and the heat insulating coating was applied by brushing. In Example 4 and Example 5 using a chlorinated polyolefin resin having a weight average molecular weight (Mw) of 90000 to 110000, application by a spray gun was barely possible (the evaluation result of sprayability in Table 1 is “ Δ ”). In Table 1, the evaluation results of sprayability of Example 1 and Example 2 (the evaluation result is “◯” because spraying was easy) are also shown.

  In Example 3 to Example 6, the same as in Example 1 except that each chlorinated polyolefin resin shown in Table 1 was used instead of Supercron (registered trademark) 892LS of Example 1. The coating 40 formed on the inner surface of the tank 20 was heated to polish the coating 40. By this polishing step, the surface of the film 40 has a water contact angle of 20 ° or less (hydrophilicity).

  Next, durability was evaluated for the film 40 in Examples 3 to 6 in the same manner as in Example 1, and the film 40 in Examples 4 to 6 was evaluated in the same manner as in Example 1. Adhesion, detergent resistance and bleach resistance were evaluated. The results are shown in Tables 1 and 2.

(Durability, adhesion, detergent resistance and bleach resistance evaluation results)
As shown in Table 1, in Examples 1 to 5 using a chlorinated polyolefin resin having a weight average molecular weight (Mw) of 50000 or more, the durability of the film 40 was particularly excellent (in Table 1, evaluation results) Is "◎"). And in Example 6 using the chlorinated polyolefin resin whose weight average molecular weight (Mw) is 5000-20000, when compared on the basis of the film obtained with the conventional heat insulating paint (acrylic resin emulsion heat insulating paint), The durability of the film 40 was excellent (in Table 1, the evaluation result was “◯”).

As shown in Table 2, the heat-insulating coating film 40 (Examples 1 and 2 and Examples 4 to 6) containing a chlorinated polyolefin resin having a chlorine content of 34% by mass or less has adhesion, The detergent resistance and bleach resistance were particularly excellent (in Table 2, the evaluation result was “◎”). And the film | membrane 40 (Example 6) of the heat insulation paint containing the chlorinated polyolefin resin whose chlorine content rate is 40-42 mass% is based on the film | membrane obtained by the conventional heat insulation paint (acrylic resin emulsion type heat insulation paint). When compared, the adhesion, detergent resistance and bleach resistance of the film 40 were excellent (in Table 2, the evaluation result was “◯”).
As shown in Examples 1 to 6 above, the washer / dryer L provided with the coating 40 excellent in hydrophilicity, durability, adhesion, detergent resistance and bleach resistance on the inner surface of the outer tub 20 is Reduced power consumption was achieved.

DESCRIPTION OF SYMBOLS 1 Base 2 Outer frame 5 Dehumidification duct 8 Drain valve 9 Drain hose 13 Intake valve 16 External air 20 Outer tank 29 Rotating drum 30 Laundry 37 Drain port 40 Film 41 Hollow bead 42 White pigment 43 Polyolefin resin 61 Fan 62 Heater 51 Cooling water Supply pipe 52 Cooling water L Washer / dryer

Claims (6)

In a washing and drying machine having an outer tub made of polypropylene for storing washing water and placing a rotating drum,
A washing and drying machine comprising a heat insulating paint film containing a polyolefin resin, hollow beads, and a white pigment on an inner surface of the outer tub.   The washing / drying machine according to claim 1, wherein the polyolefin resin is a chlorinated polyolefin resin.   The surface of the hollow bead has hydrophilicity, and the surface of the hollow bead is partially exposed on the surface of the coating film.   A heat insulating paint for an outer tub of a washing and drying machine, comprising a polyolefin resin, hollow beads, and a white pigment. A film forming step of applying a heat insulating paint for an outer tank containing a polyolefin resin, hollow beads, and a white pigment to form a film of the heat insulating paint on the inner surface of an outer tank made of polypropylene in a washing and drying machine,
A film heating step for heating the film at a temperature equal to or higher than a temperature at which the polyolefin resin melts;
A method for applying a heat-insulating coating material for an outer tub of a washing / drying machine. A film forming step of forming a film of the heat insulating paint by applying a heat insulating paint for an outer tank containing a polyolefin resin, a hollow bead having a hydrophilic surface and a white pigment on the inner surface of a polypropylene outer tank in a washing and drying machine When,
A polishing step of polishing the surface of the coating to expose the surface of the hollow beads;
A method for applying a heat-insulating coating material for an outer tub of a washing / drying machine.

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