JP2019123173A - Method for manufacturing urethane molding product for medical, beauty parlor, and barbershop use - Google Patents

Abstract

To provide a molding product provided with a water cut-off property that can cut-off ingress of water to inside regarding a method for manufacturing an urethane molding product compatible with the place where the product can touch a human body, used for medical, beauty parlor, and barbershop use.SOLUTION: A method for manufacturing an urethane molding product for medical, beauty parlor, and barbershop use, after preparing two urethane raw liquids that forms continuous bubbles after hardening, and forming a mold comprising a cavity and a core taken from the molding product for an object to be female molds, applies the steps including: a) fixing an urethane film provided with a water cut-off property that can cut-off the ingress of water to inside, flexibility, and unevenness property in a tensioned state so as to cover the upper surface of the cavity and the core of the mold; b) preparatory heating the mold in the range of 40°C-80°C and sucking it by a vacuum sucker to adhere it to the bottom; c) accelerating the foaming reaction of urethane while heating the two urethane raw liquids, and taking out the molding product after curing and hardening.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a method for producing a urethane molded article corresponding to a part which may touch a human part used for medical and barber and beauty.

Conventionally, a large number of urethane molded articles are used as medical instruments, but some of them are used in places where there is a possibility of touching a human site.
For example, there are a CT scan and a pillow for medical treatment of MRI, a handle of various instruments held by hand, and a chest pad for ultrasonic waves to be brought into contact with the skin.
Usually, the surface of these urethane molded articles is covered with a film of a sprayed urethane paint, which serves as a surface protective film to the inside of the foamed urethane.
However, when the surface is examined, although the fiber layers overlap and have a certain thickness, fine pores are present in a thin layer, and it can not be said that the water-retaining property is not maintained.
Therefore, if water intrudes from the fine pores, the urethane in the inside is formed by the communicating air bubbles, so that it penetrates in the communication state, and the inside may have wettability. In the case of medical use, this wettability has the risk of causing infection due to the proliferation of bacteria, or causing more serious adverse effects in the infiltration of blood and the like.
On the other hand, when the water blocking property is required, if the molded article is formed of a closed cell foam such as polyethylene, the water blocking property can be secured by the isolated cells, but the polyethylene molded article is In many cases, the properties after curing are hard and lack flexibility, and it is likely to be unsuitable if contact with the above-mentioned part of the person can not be avoided.
Such a problem is included in a urethane molding for medical use which is used where there is a possibility of contact with a part of a person.

  In addition, although the method of joining a synthetic resin sheet to a foaming molding and manufacturing a composite molding is described in patent document 1, this invention is mainly with respect to the molding of the closed cell type which promotes foaming by steam heating It can not be used where it comes in contact with human parts, and it does not have the purpose of waterproofing.

Japanese Patent Application Laid-Open No. 3-27925

  The present invention has been made in view of the above problems, and is premised on the use of a flexible urethane foam, and seeks for a water blocking property which can prevent the infiltration of water therein, and medical treatment. It is intended to provide for the purpose of hairdressing and beauty.

  The method for producing a urethane molded article of the present invention for medical and barber and beauty uses a base resin which forms open cells after curing and which can support comfortable elasticity and posture of a part of a person upon contact with the person. After preparing a urethane stock solution consisting of the two components, and a hardener, and forming a mold consisting of a cavity and a core that molds the target molded article into a female mold, a) blocking the entry of water into the interior In order to cover the upper surface of the mold cavity and the core, a urethane film having water-proofness, flexibility extending from the peripheral edge of the mold to the mold bottom, and unevenness forming the surface as a slip resistant surface is provided. Fixing in a stretched state, b) preheating the mold in the range of 40 ° C. to 80 ° C. and suctioning with a vacuum suction machine to bring the urethane film into close contact with the bottom of the mold, c) The urethane stock solution of the above two liquids is put into the mold and heated. Promote foaming reaction of urethane, and then perform steps of removing molded products after curing and curing, and d) cutting and shaping the bonding surface end of the urethane film of the molded products taken out. .

  In the method for producing a urethane molded article for medical care / beauty and beauty according to claim 2, between the step a) and the step b) according to claim 1, the urethane film is made a transparent or translucent film and the back side is It is characterized in that a step of forming a paint layer using a coloring agent to a urethane stock solution is carried out.

  In the method for producing a urethane molded article for medical care / beauty and beauty according to claim 3, prior to the step a) according to claim 1 or claim 2, a step of applying a primer liquid to the peripheral portion of the concave groove of the mold It is characterized by having applied.

The molded article obtained by the production method of the present invention is an open-celled foamable urethane which is inherently incapable of having water-stopping properties, such as closed cells, is formed of a film having a dense molecular structure whose surface is based on urethane bonds. Due to the homogeneous membrane, it does not allow the penetration of water, and is superior in water resistance to closed cells.
During molding, the inside of the mold becomes pressurized during the process of foaming of the urethane stock solution, and the foam foam and the film become in close contact with each other, and the flexibility is increased by preheating, and the bonding of both is further enhanced. Be strong.
By such water blocking, concerns such as proliferation of bacteria are eliminated.

  The urethane liquid used in the present invention forms an open cell after foaming and has an appropriate elasticity, so that an unpleasant feeling due to the contact does not occur, a soft and comfortable feeling is given, and safety is secured.

  At the same time, since the urethane film is subjected to processing such as emboss processing and satin processing, it has anti-slip properties in which fine asperities are engraved, and it can be used for pillows, handles, etc. Deviation is not caused.

  If the urethane film is fixed in a stretched state so as to cover the upper surface of the mold cavity and core, and the mold is preheated in the range of 40 ° C. to 80 ° C. and suctioned by a vacuum suction machine, the film is essentially flat. The body can be closely adhered along the curved mold bottom without wrinkles, and the surface as a molded article can be finished to be evenly stretched without wrinkles on the film.

According to the aspect of claim 2, the resistance to ultraviolet light of the transparent or translucent urethane film is enhanced, and at the same time, separation, peeling, etc. between the paint layer and the urethane foam, and between the paint layer and the urethane film. Not cause
If characters, marks, etc. are displayed inside the film body, there is no wear even in long-term use, and a reliable display for medical use becomes possible.

  According to the aspect of claim 3, when a primer liquid having high adhesion is applied to the urethane foam and the urethane film on the periphery of the cavity and the groove of the core, the adhesion between the urethane foam and the urethane film in the joint portion The adhesion between two urethane films is enhanced.

It is a schematic diagram of the urethane foam injection | pouring machine used for this invention. It is a schematic side view of the metal mold | die used for this invention. (A) is a step of applying a primer, (b) is a step of placing a urethane film, (c) a step of vacuum suction, and (d) forms a paint layer. Shows the process. In a schematic aspect showing each step of the present invention, (e) shows a step of injecting a urethane stock solution, (f) shows a step of foaming urethane, and (g) a step of demolding. It is a typical sectional view showing an example of a cast obtained by a manufacturing method of the present invention.

  First, the urethane foam injection machine 10 which is a premise of the manufacturing method will be described. As shown in FIG. 1, the apparatus comprises two tanks, an A tank containing a urethane main agent and a B tank containing a curing agent, and connects the liquid feed pipes 11, 12 with valves from both tanks, The mixing 13 which mixes both liquid in the tip is arrange | positioned, and delivery by mixing with forced agitation is enabled from the mixing head 14 to the shaping | molding die 20 mentioned later.

With regard to the foamable urethane stock solution G composed of the main agent and the curing agent, first, the urethane liquid was used as a foamable urethane forming open cells, and the molded product 30 after foam curing touched a human part While providing cushioning properties without a sense of resistance at the same time, it shall have a supporting property of hardness that can withstand use as a pillow, a handle or the like.
In addition, in the foaming reaction by the two-component reaction, the generated gas has a degree of flexibility so as to be an open cell instead of a closed cell.
The foaming ratio and the like of the urethane stock solution G are determined so as to have such characteristics, and those having a size of 5 to 20 can be used.
The urethane stock solution G is of two types, a polyether type and a polyester type, and a polyether type in which the decomposition of water is suppressed in order to enhance the water barrier properties is preferred. Systems can also be used.

As for the mold 20, as shown in FIG. 2, the concave grooves 23 and 24 are formed by opening and closing the cavity 21 and the core 22 via the hinge 27, and one of the molded articles is molded and the concave groove 23 is formed. The same applies to the opposite core. The combination of the irregularities is optional, and in the case of a pillow or the like, a convex may be formed on the core side.
A vacuum suction machine for vacuum suction is disposed at one end of both molds of the cavity 21 and the core 22, and suction holes 25, 26 connected with the suction machine by pipes are provided on the back of the cavity 21 and the core 22. Form each.
At this time, since suction has a large concave portion or the like according to the curved surface of the mold bottom wall, if the position of the suction hole is set in accordance with that, suction can be performed without waste.

Although urethane films 31 and 32 are used in the present invention, the characteristics required for the urethane films 31 and 32 will be described.
The urethane films 31 and 32 used in the present invention have water resistance as a film that prevents water from entering inside, flexibility that can extend from the peripheral edge to the bottom of the mold, and a smooth surface such as satin. Unevenness is required.
Water proofing means that water, body fluid, blood, etc. adheres to the surface of a molded article due to medical treatment, examination, etc., or moisture condenses under conditions of high humidity, etc., and this component is molded. The ability to prevent entry into the interior of the product. This is provided by the dense molecular structure of the urethane molecule and the water blocking ability of the membrane having a uniform and constant thickness, for example, a thickness of about 10 to 50 μm.

In the case of flexibility, in the molding of the mold described later, the urethane films 31 and 32 of the above film body are placed on the surface of the mold and the peripheral edge is fixed by a frame etc. In order to be in a state of being in intimate contact with this, it is possible to have a flexibility that can follow the drawing by this vacuum suction. At the same time, when it comes in close contact with the bottom of the mold preheated to 40 to 80 ° C., it is plasticized by the heat, and the flat film has flexibility enough to conform uniformly along the curved surface.
The film provided with this condition is a product after molding, and the surface described later becomes a film with no wrinkles and causes discomfort when touching a human site similar to the foam layer 35 inside. It has a feature that does not

In the case of unevenness, for example, when it is used for pillows, handles, etc., when the person's neck is touched or gripped with a hand, if the surface is slippery, slippage or slippage will occur and a danger is expected. It refers to the ability to prevent this slippage.
For example, it refers to those engraved with a wrinkle pattern called emboss processing, those squeezed into concavo-convex grooves called satin, those in which fine concavities and convexities are inscribed, and the like.

  After the foam injection machine 10 and the mold 20 are prepared, the primer liquid can be applied to the peripheral portions of the concave grooves 23 and 24 of the mold 20 (see FIG. 3A). In the present invention, the primer liquid is for enhancing the adhesion and water resistance of a mold joint of a molded product to be described later, and a liquid having high adhesion is selected for the films 31 and 32, For example, chloroprene rubber adhesives and the like can be mentioned. The primer solution is sprayed with a gun toward the peripheral edge of the mold groove (hatched portion in FIG. 2) or brushed, etc., and the coating layer is applied to the peripheral edge of the groove to a width of about 3 to 10 mm. Form.

Next, as shown in FIG. 3 (b), the urethane film 31 covers the recessed groove 23 of the cavity 21 to have a size having a margin for a certain width, and it is placed on the bonding plane, and similarly on the core side. I assume. Then, in order to secure the tension of the film, the peripheral edge is fixed by the frames 21a, 22a and the like fitted in the grooves.
At this time, since the urethane films 31 and 32 have concavities and convexities on one side as described above, they are placed so that the concavo-convex surface is on the front side (side in contact with the wall surface of the mold groove).
After the film is fixed in a stretched manner by the frames 21a and 22a 'etc., the cavity 21 and the core are closed via the hinges 27 and fixed by clamps.
At this time, both the mold for the cavity 21 and the core 22 preheat the temperature in the range of 40 to 80 ° C. The preheating is to improve the softness of the urethane films 31 and 32 by utilizing the thermoplasticity.

After setting the urethane films 31 and 32 in the mold, as shown in FIG. 3C, suction from the vacuum suction device is started. Then, the air in the gap between the forming groove and the urethane film 31, 32 was removed, and the urethane film 31, 32 was gradually stretched to the bottom of the forming groove and eventually adhered to the bottom of the concave groove 23, 24 It becomes a state.
Then, since the urethane films 31 and 32 are originally flat, there is a possibility that wrinkles may be generated in the film body due to the difference between the flat surface and the curved surface along the curved surface, but as described above, they are fixed to the frames 21a and 22a. The stretched urethane films 31, 32 are stretched in a stretched state toward the mold bottom side by negative pressure by a vacuum suction device. When the mold is in close contact with the bottom, the mold is heated to 40 to 80 ° C., so that the film is plasticized by heat, and the flat film conforms uniformly along the curved surface, and the urethane film 31, In the case of No. 32, the surface is finished with no wrinkles along the curved surface.

At this time, when using the urethane films 31 and 32, the urethane film is weak to ultraviolet light, and as it is, there is a possibility that the weather resistance may be lost. As a countermeasure for this, a combination of a transparent or translucent urethane film and a paint called a coloring agent (priming agent) for a urethane stock solution described later can be employed.
That is, a transparent or translucent film is selected as the urethane film 31, 32, and the paint layer 33, 34 is formed using the coloring agent (base bonding agent) for the two-component urethane stock solution. Since various kinds of colors can be selected for the base bonding agent, a desired color is prepared, and for example, two, three or more paints and pigments are mixed to prepare a desired color. As a result, since the coloring agent (priming agent) for the two-component urethane stock solution is rich in weather resistance, the entire paint layer has weather resistance.
As shown in FIG. 3D, the prepared paint is sprayed on the surface of the transparent urethane film with a spray of a gun or the like to form paint layers 33 and 34.
By using a base-adhering agent, it is possible to prepare a color of your choice, and sometimes it is also possible to express a designed pattern. In addition, the base bonding agent has good compatibility with the foam layer 35 and does not cause deterioration such as separation or peeling.

Next, as shown in FIG. 4 (e), the urethane stock solution G in which the main agent and the curing agent are mixed from the foam injection machine 10 is passed from the foam injection machine 10 through the mixing head 14 and mold grooves 23, 24. Into the space S formed by
Then, the mold 20 is brought into the heating state maintaining the preheating temperature of 40 to 80 ° C., and after 15 to 30 minutes, a foaming reaction of urethane takes place inside, and the isocyanate and polyester or polyether react. Since a foaming phenomenon accompanied by carbon dioxide gas generation is caused and the urethane stock solution G has a sufficient degree of softness, it does not become closed cells but becomes foamed with open cells formed (see FIG. 4 (f)). At this time, the foamed layer 35 formed with the increase of the gas pressure gradually pushes the urethane films 31 and 32 covering the peripheral edge to the mold wall surface.

  When the foaming reaction of the urethane is completed, as shown in FIG. 4 (g), the clamp 28 is released, the cavity 21 and the core 22 are opened, and the molded body 30 after curing is taken out from the inside. Thereafter, natural curing is allowed to stand for about 24 hours as it is, and then it is put into a heating furnace at 30 to 80 ° C. to perform heating curing to stand for about 8 hours to promote complete curing.

When a completely cured molded body 30 is obtained, the end portion 36 serving as the interface between the cavity 21 and the core 22 extends in a state in which the two urethane films disposed in the cavity 21 and the core 22 extend out. Then, cut and shape it along the periphery of the formed body 30 with a cutting machine or scissors or the like.
Thus, as shown in FIG. 5, a urethane molded article for medical and cosmetic use is obtained which is used in contact with a portion of a person targeted by the present invention.

Then, the effect of the urethane molded article obtained by the manufacturing method of this invention is demonstrated.
The urethane stock solution used in the present invention is open-cell foamable and can not have water-stopping properties such as closed-cell foam.
However, the surface of the molded article of the present invention is formed of a urethane film 31, 32 urethane film, and the urethane film is a film having, as its chemical component, a dense molecular structure based on urethane bonds and having a certain thickness. As it becomes the body, it is extremely water-tight, which does not allow the entry of water.
In the urethane films 31 and 32, during molding, the inside of the mold is in a pressurized state in the process of foaming of the urethane stock solution G, and the foamed foam body and the film body are in close contact. And although the film is stretched by vacuum suction and stretched, it becomes elastic after curing of the urethane, and the foam layer 35 as the foam body and the urethane films 31 and 32 as the film body. The joint of the above is made stronger.
Further, at the interface between the cavity 21 and the core 22, the two urethane films 31 and 32 disposed to both are joined, but when the mold is set, the rim of the groove of the cavity 21 and the core 22 is formed. By applying a primer liquid having high adhesion to the urethane film, the adhesion of the urethane films 31 and 32 at the joint portion can be enhanced.

The urethane stock solution G composed of the main agent and the curing agent used in the present invention reacts with the urethane having isocyanate and the polyether and polyester components as described above, and after foaming and curing, open cells are formed to provide appropriate elasticity. It will be equipped.
As a result, if it is a hard molded product, it is uncomfortable and dangerous when touching a person's part, such as a pillow or a handle, but according to the present invention, the sense associated with this contact is not good. There is no pleasure, it gives a soft and comfortable feeling, and safety is ensured.

At the same time, when touching a part of a person, slippage or slippage occurs if it is slippery, which is dangerous.
However, according to the present invention, the urethane films 31 and 32 are those having a scuffed pattern such as wrinkled processing or engraved with a satin pattern, those that have been squeezed into a concavo-convex groove called a satined surface, and fine concavities and convexities. Anti-slip properties.
Thereby, even if it is used for a pillow, a steering wheel, etc., when a person's neck touches or holds in hand, a slip and a shift are not produced.
In addition, in forming the concavo-convex grooves 23 and 24, considerable processing cost is required to emboss the mold 20. However, if a pre-formed urethane film subjected to a satin treatment etc. is selected, The cost can be reduced and the size of the unevenness can be freely selected each time.

Further, in the manufacturing method of the present invention, the flexibility of the urethane films 31 and 32 is increased by the preheating of the molds, and the urethane films are suctioned by vacuum and the urethane films are the bottoms of the recessed grooves 23 and 24 of the mold 20 Until it is in close contact, and then it is cured by heat foaming and curing.
At that time, the urethane films 31 and 32 fixed and stretched on the frame bodies 21a and 22a are stretched toward the mold bottom side by the negative pressure by the vacuum suction device and heated to 40 to 80 ° C. when closely adhered to the bottom part The mold heat plasticizes and the film conforms along the curved surface of the bottom. Then, when the flat film follows the curved surface, it is possible to make the surface of the film body have a wrinkle-free finish that may have wrinkles in the film body.
Then, the foam-like foam layer 35 and the film-like urethanes 31 and 32 are in close contact with each other by pressure from foaming of the undiluted urethane solution G, and after being shaped, they come into close contact. As a result, the film is formed. The surface is in a state of tension, and the molded article is beautifully finished.

Furthermore, if the urethane films 31 and 32 are transparent or translucent urethane films, and a layer of a paint as a base bonding agent is formed there, the resistance to ultraviolet light is enhanced and the weather resistance is excellent. Become.
At the same time, since the base bonding agent has high compatibility with the foam layer 35, the paint layer 33, 34 and the foam layer 35 do not separate or peel off, and similarly, the paint layer 33, 34 and the urethane film Even if it is between 31 and 32, it does not cause separation, peeling and the like.
Because the color can be freely adjusted, it is possible to select a color desired, a color required for medical safety, etc., and design patterns and insertion of characters are also free.
Here, safety is a priority for molded articles for medical use, and there is a case where insertion of a letter corresponding to a cautionary note is required. In this case, if the letter is displayed on the surface as in the conventional case, it disappears due to wear or the like. In the case of the above embodiment, characters, marks and the like can be displayed on the inside of the film body, and even in long-term use, there is no wear and reliable display can be achieved.

  The molded articles produced according to the present invention are mainly directed to medical applications such as use as breast rest members, but are also applicable to barber and beauty in the same principle.

DESCRIPTION OF REFERENCE NUMERALS 10 urethane foam injection machine 11 liquid feeding pipe 12 liquid feeding pipe 13 mixing 14 mixing head 20 mold 21 cavity 21 a frame 21 core 22 core 22 a frame 23 concave groove 24 concave groove 25 suction hole 26 suction hole 27 hinge 28 clamp 30 molded body 31 Urethane film 32 Urethane film 33 Paint layer 34 Paint layer 35 Foamed layer 36 Edge G Urethane stock solution

Claims (3)

Preparing a urethane stock solution consisting of a two-component composition of a main agent and a hardener, which forms open cells after curing, and which can support comfortable elasticity and posture of a person's part, etc. by human contact, After forming a mold consisting of a cavity and a core in which the target molded article is molded into a female mold,
a) A urethane film provided with a water-repellant property capable of preventing the entry of water into the interior, a flexibility extending from the peripheral edge of the mold to the mold bottom, and an uneven property forming the surface as a slip resistant surface; Securing in tension so as to cover the upper surface of the mold cavity and the core;
b) preheating the mold in the range of 40 ° C. to 80 ° C. and suctioning with a vacuum suction machine to adhere the urethane film to the bottom of the mold;
c) charging the urethane stock solution of the above two solutions into the mold, promoting the foaming reaction of the urethane under heating, and then taking out the molded article after curing and curing;
d) cutting out and shaping the bonding surface end of the urethane film of the molded article taken out;
A method for producing a urethane molded article for medical care and beauty and beauty, characterized by applying   Between the step a) and the step b) according to claim 1, a step of forming a paint layer by using a urethane film as a transparent or translucent film and using a coloring agent for a urethane undiluted solution on the back side A method for producing a urethane molded article for medical care and beauty and beauty characterized by   Before the step a) of claim 1 or claim 2, a step of applying a primer liquid to the peripheral edge portion of the concave groove of the mold is carried out. .

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