KR101767947B1 - Manufacturing method of artificial snow - Google Patents

Abstract

The present invention relates to a manufacturing method of artificial snow, which comprises the following steps: a) preparing a mixture by mixing borax with at least one polymer selected from the group consisting of polyvinyl alcohol, maleic acid polymers, polyacrylate, vinyl acetate polymers, and copolymers thereof; b) adding urethane raw liquid to a container and foaming the same into urethane foam; c) applying the mixture onto the urethane foam between the time when the foamed urethane foam is semi-cured and the time when the foamed urethane foam is fully cured; and d) spraying 20-30 wt% of spray-type water for the total weight of the mixture on the applied mixture, and drying the same at room temperature to produce artificial snow.

Description

{Manufacturing method of artificial snow}

The present invention relates to a method for producing artificial eyes.

Artificial snow is used in the absence of natural snow in places such as winter sports such as skiing, snowboarding, or snowballing, or in place of natural snow to enjoy winter sports in places without natural snow Recently, however, unlike the conventional soft snow, there has been a lot of interest in the development of hard snow that can be applied and applied to various types of sculptures, art works, stage devices and the like. Such a hard snow can be used, for example, It can also be applied to art or plastic works such as 3D frames.

On the other hand, according to the conventional art relating to the method of manufacturing artificial eyes, although it is manufactured using plastic raw materials as main materials in the production of artificial eyes, it has to be maintained at a constant temperature condition (about 0 to 6 ° C) Therefore, there is a problem that the cooling cost is excessively spent for this purpose, and the commerciality is lacking. Also, the manufacturing cost of the artificial eye is high and the manufacturing process is complicated.

Korean Patent Publication No. 2002-0074406 (September 30, 2002)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a method for manufacturing The present invention also provides a method for manufacturing an artificial eye having excellent adhesiveness.

In order to accomplish the above object, the present invention provides a method for preparing a mixture by mixing a) at least one polymer selected from the group consisting of polyvinyl alcohol, maleic acid polymer, polyacrylic acid salt, vinyl acetate polymer, ; b) adding a urethane stock solution to the container and foaming it in a urethane foam; c) applying the mixture on urethane foam between the time when the foamed urethane foam is semi-cured and when it is fully cured; And d) applying 20 to 30% by weight of water on the applied mixture by spraying method based on the total weight of the mixture and drying at room temperature to produce artificial eyes.

According to another embodiment of the present invention, an artificial eye manufactured according to the above method provides an artificial eye for use in 3D wall painting or for fixing to a 3D frame.

The method for manufacturing artificial eyes according to the present invention is simple in manufacturing process, easy to manufacture in various shapes, and low in manufacturing cost.

On the other hand, the artificial eyes manufactured according to the method of the present invention maintain the shape or condition of the artificial eye almost unchanged even if the temperature is not maintained at a constant temperature condition, and have an excellent adhesive property.

FIG. 1 is a view showing an artificial eye produced through a method of manufacturing an artificial eye according to a first embodiment of the present invention.
FIG. 2 is a view showing an artificial eye produced by the artificial eye manufacturing method according to the second embodiment of the present invention.
FIG. 3 is a view showing an artificial eye produced by a method of manufacturing an artificial eye according to an embodiment of the present invention.
4 and 5 are views showing artificial eyes that have failed to manufacture according to the comparative example of the present invention.

The present invention solves the problems of the artificial eye manufacturing method according to the prior art, and provides a method for manufacturing an artificial eye which is simple in manufacturing process, easy to manufacture in various shapes, and low in manufacturing cost. Meanwhile, the artificial eye manufactured according to the method of the present invention maintains the shape or state of the artificial eye for a long period of time without having to maintain a constant temperature condition, and has an excellent adhesive property.

Specifically, the artificial eye manufacturing method according to an embodiment of the present invention comprises the steps of: a) mixing borax with at least one polymer selected from the group consisting of polyvinyl alcohol, maleic acid polymer, polyacrylic acid salt, vinyl acetate polymer, Preparing a mixture; b) adding a urethane stock solution to the container and foaming it in a urethane foam; c) applying the mixture on urethane foam between the time when the foamed urethane foam is semi-cured and when it is fully cured; And d) spraying 20 to 30% by weight of water on the applied mixture with respect to the total weight of the mixture and drying at room temperature to produce artificial eyes.

Hereinafter, the present invention will be described in detail.

First, a) a mixture is prepared by mixing borax with at least one polymer selected from the group consisting of polyvinyl alcohol, maleic acid polymer, polyacrylic acid salt, vinyl acetate polymer and copolymers thereof (step a).

The polymer of the present invention is preferably at least one polymer selected from the group consisting of polyvinyl alcohol, maleic acid polymer, polyacrylic acid salt, vinyl acetate polymer and copolymers thereof, more preferably polyvinyl alcohol.

On the other hand, borax (sodium tetraborate tetrahydroborate) Na2B4O7 · 10H2O of the present invention is one of the boron compounds, refining natural acid, kernite in water and boiling and then recrystallizing, · It may be obtained by directly acting sodium carbonate on brassite or by making boric acid once and then neutralizing crystal.

On the other hand, the borax is sequentially or simultaneously mixed with at least one polymer selected from the group consisting of polyvinyl alcohol, maleic acid polymer, polyacrylate, vinyl acetate polymer and copolymers thereof to prepare a mixture, A stirring process may be additionally included.

In the preparation of the mixture, the polymer and borax are preferably mixed at a weight ratio of 9: 1 to 7: 3, more preferably the polymer and borax are mixed at a weight ratio of 8: 2.

When the polymer is mixed with borax in a weight ratio of more than 9: 1, the binding force of the mixture is weakened, so that the separation of the compound occurs and the polymer can be separated into small lumps. When the polymer and borax are mixed, 7: 3, the binding force of the mixture is excessively excessive to cause a crack phenomenon, which may cause a crack in the product.

On the other hand, in the preparation of the mixture, water may be added together. In this case, the water may be included in an amount of 20 to 30% by weight based on the total weight of the mixture. If water is included in the preparation of the mixture at this stage, artificial eyes may be produced even if only a small amount of water is sprayed in step d) .

Next, the urethane stock solution is added to the container and foamed with a urethane foam (step b).

The container may be, for example, a frame, a panel, an inner wall or an outer wall of a building, or a molding mold, and the object is not particularly limited.

In the step b), the urethane stock solution is added to the container to foam it into a urethane foam. The foamed urethane foam may have properties such as excellent heat insulation performance, self-adhesiveness, and ease of manufacture.

The method of forming the urethane foam may be, for example, a mold foam method, a block foam method, a slab foam method, or a spray foam method. However, the method of forming the urethane foam in the present invention is not particularly limited.

The method of forming the urethane foam will be described in more detail. The mold foam method is a method of producing a product by using a mold having a predetermined space therein, or assembling an actual product and injecting a urea stock solution into an inner space. It is used to produce foam by injection of Urethane solution into a rectangular mold (size: about 1x1x1m), and it is used by secondary processing suitable for its use. The slab foam method is used by using a continuous conveyer line, The face is opened and the second process is used as a product. The spray foam method is a method of mixing isocyanate and resin premix and using high pressure air Strong jetting out of the nozzle means that the surface is irregular in a few seconds.

Meanwhile, in the present invention, the urethane stock solution may be one comprising a resin premix and an isocyanate.

The resin premix may be a mixture of a polyol, a catalyst, a foam stabilizer and other additives. In the present invention, the polyol may be a polyether or a polyester polyol, and may be used alone or in combination with the initiator and the number of functional groups .

The foam stabilizer may be a silicone foam stabilizer and may have effects of emulsifying the resin, dispersing the foaming gas, preventing cellular foaming, stabilizing the cell membrane, and improving the heat insulation performance.

The catalyst may be one used for controlling the reaction rate and improving the moldability. Generally, two or three kinds of catalysts can be used in combination, and the kind thereof is particularly limited as long as it is generally used in the related art no.

As the above-mentioned additives, for example, a foaming agent may be used, and as the foaming agent, water, R-11, HCFC-141b, cyclopentane and the like may be used.

On the other hand, the type of the isocyanate used in the present invention is not particularly limited, and for example, Polymeric MDI can be used.

When the urethane raw material solution as described above is added and foamed into a urethane foam on the container, an intermolecular three-dimensional network structure is formed due to the reaction between the polyol and the polyisocyanate.

Meanwhile, the urethane foam produced according to the present invention is a rigid polyurethane foam. In the artificial eye manufacturing method of the present invention, since the hard polyurethane foam is used, it is possible to secure physical stability of artificial eyes and stability from heat and moisture .

Next, the mixture is applied on the urethane foam between the time when the foamed urethane foam is semi-cured and the time when it is fully cured (step c).

In the present invention, it is important to apply the mixture prepared in step a) onto urethane foam foamed through step b). Particularly, in the present invention, the mixture is applied between the point where the urethane foam foamed through the step b) is semi-cured and completely cured.

In one embodiment of the present invention, the time point at which the mixture is applied may be a point where the foamed urethane foam is cured at 70 to 80%. When the above-mentioned mixture is applied at the time when the foamed urethane foam is cured to less than 70%, there may be a problem that the mixture is mixed with the urethane foam to be foamed further, and the mixture is hardened when the foamed urethane foam is cured The surface hardening may be excessively excessive and the mixture may not be fixed to the foam surface and may be separated.

Finally, 20-30% by weight of water is sprayed onto the applied mixture and dried at room temperature to prepare artificial eyes (step d).

In step d) of the present invention, water is added to the mixture applied on the foamed urethane foam, and the amount of water added to the mixture may be 20 to 30% by weight based on the total weight of the mixture. If the amount of the added water is less than 20% by weight based on the total weight of the mixture, the mixture may not be fixed and may be separated from each other, and the amount of the added water may be more than 30% by weight There is a problem in that the mixture may not flow down due to excessive moisture.

Meanwhile, in the step d), a spray method may be used as a method of applying moisture. When moisture is applied through the spraying method, moisture can be uniformly added to the entire mixture, and thus artificial eyes can be effectively produced.

On the other hand, when moisture is added to the mixture as described above, and then the mixture is naturally dried at room temperature (the room temperature in the specification of the present invention means 20 to 25 ° C) for 3 hours to 4 hours, Snow is produced. On the other hand, in order to shorten the drying time, a cold air drying method may be used. However, when hot air drying is performed, there is a problem that the adhesive strength is lowered due to excessive moisture evaporation, and therefore, natural drying or cold air drying is preferable.

As described above, the artificial eye manufacturing method of the present invention is simple in manufacturing process, can be manufactured in various forms, and is low in manufacturing cost. On the other hand, the artificial eyes manufactured according to the method of the present invention maintain the shape or state of the artificial eyes unchanged for a long period of time, even when the temperature is not maintained at a constant temperature condition, and have an excellent adhesive property. Therefore, it is possible to attach to edges or ceiling surfaces which are difficult to be adhered.

Meanwhile, the artificial eyes manufactured according to the present invention can be variously used for various sculptures, artworks, stage devices, and the like, and are also applicable to arts or formworks such as 3D wall paintings or 3D frames. It also includes the function of insulation as basically, so it can be utilized as an interior finish.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. It should be understood, however, that the following examples and comparative examples are intended to assist the understanding of the present invention and are not intended to limit the scope of the present invention thereto.

Example

Example  One

200 g of PVA, 60 g of borax, and spray water were prepared.

The surface of the object (container) to which the artificial eye is to be adhered was cleaned up before and after the normal room temperature condition (about 25 ° C), and the urethane foam was uniformly foamed on the object surface. Wait until the foamed urethane foam is 70 to 80% surface hardened.

On the other hand, the mixture was prepared by mixing the PVA, borax and 85 g of water, uniformly mixing and kneading the mixture, and uniformly applying the mixture on the 70 to 80% surface-hardened foamed urethane surface.

Next, a small amount of water was applied on the coated mixture by a spray method and then fixed by natural drying method to produce artificial eyes (see FIG. 1).

Example  2

200 g of PVA, 60 g of borax, and spray water were prepared.

The surface of the object (container) to which the artificial eye is to be adhered was cleaned up before and after the normal room temperature condition (about 25 ° C), and the urethane foam was uniformly foamed on the object surface. Wait until the foamed urethane foam is 70 to 80% surface hardened.

On the other hand, the powder mixture of PVA and borax was spread evenly on the 70 to 80% surface-hardened foamed urethane surface.

Next, an amount of water of about 30% of the weight of the mixture was applied to the applied mixture by spraying method two to three times, followed by fixing by natural drying method to produce artificial eyes (see FIG. 2).

Comparative Example  One

The same procedure as in Example 2 was carried out except that 220 g of PVA and 40 g of borax were used. Thus, when the mixture was prepared, it was difficult to coat the surface of the foamed urethane with the mixture, which made it impossible to manufacture artificial eyes (see FIG. 4).

Comparative Example  2

The procedure of Example 2 was repeated except that 160 g of PVA and 100 g of borax were used. As a result, when the mixture was prepared, the mixture was separated into a powder form and hard to be applied to the foamed urethane surface, making it impossible to produce artificial eyes (see FIG. 5).

Comparative Example  3

The procedure of Example 2 was repeated except that the mixture was applied on a urethane foam at a time point when the urethane foam was cured at 30% rather than at the time when the urethane foam was semi-cured. When the mixture was mixed with the urethane foam, It was impossible.

Comparative Example  4

The mixture was applied on a urethane foam at a time point when the urethane foam was cured at 90% instead of at the time when the urethane foam was semi-cured, but the mixture was separated without being fixed on the surface of the urethane foam It was impossible to make artificial eyes on the container.

Comparative Example  5

The procedure of Example 2 was repeated except that the amount of water to be added in step d) was adjusted to about 10% by weight (30 g) based on the total weight of the mixture and the mixture was not fixed on the urethane foam, It was impossible.

Comparative Example  6

The procedure of Example 2 was repeated except that the amount of water added in step d) was changed to about 40% by weight (170 g) based on the total weight of the mixture.

Example  One Example  2 Comparative Example  One Comparative Example  2 Comparative Example  3 Comparative Example  4 Comparative Example  5 Comparative Example  6 PVA 200g 200g 220g 160g 200g 200g 200g 200g borax 60g 60g 40g 100g 60g 60g 60g 60g water 85g 85g 85g 85g 85g 85g 30g 170g urethane
Semi-hardening
Point 70 to 80% 70 to 80% 70 to 80% 70 to 80% 30% 90% 70 to 80% 70 to 80% Artificial eyes
Manufacture O O X X X X X X

Claims (7)

a) mixing the polyvinyl alcohol polymer and borax at a weight ratio of 9: 1 to 7: 3 to prepare a mixture;
b) adding a urethane stock solution to the container and foaming it in a urethane foam;
c) applying the mixture onto the urethane foam at a time when the foamed urethane foam is cured to 70 to 80% between the time when the foamed urethane foam is semi-cured and the time when the foamed urethane foam is fully cured; And
d) applying spray-type water in an amount of 20 to 30% by weight based on the total weight of the mixture to the applied mixture, and drying the mixture at room temperature through a natural drying method or a cold air drying method to produce an artificial eye .
delete The method according to claim 1,
Wherein the mixture of step (a) is a mixture of polymer and borax in a weight ratio of 8: 2.
The method according to claim 1,
Wherein the urethane foam in step b) is a hard urethane foam.
delete delete Artificial eye manufactured according to the method of paragraph 1, artificial eye used for 3D wall painting or for fixing to a 3D frame.

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