JP2003266018A - Coating method for water base adhesive, method for inhibiting film-forming, method for manufacturing shoes using the methods, shoes and adhesive set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use a coating device for a long period of time well, to enhance a working efficiency for coating an adhesive, to reduce a manufacture cost, to uniformly coating an object to be adhered having a complex shape and to stably obtain high adhesion strength. <P>SOLUTION: When an adhesion surface of the object to be adhered is coated with the water base adhesive, a coating tool constituting a coating part by a soft foam is used. After this coating part is impregnated with the water base adhesive, the coating part abuts to the adhesion surface. Thereby, this adhesion surface is coated with the impregnated water base adhesive. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for applying an aqueous adhesive, a method for suppressing film formation, a method for manufacturing shoes using the same, a shoe for the same, and an adhesive set. It can be used satisfactorily over a long period of time, the work efficiency of adhesive application is high, the manufacturing cost can be reduced, it can be evenly applied to the adherend having a complicated shape, and high adhesive strength can be stably obtained. The present invention relates to an adhesive application method and the like.

[0002]

BACKGROUND OF THE INVENTION There are adhesives using an organic solvent, which are used for various purposes. In this organic solvent-based adhesive, the organic solvent that evaporates during coating work is There is a possibility that it may have an adverse effect, and that the vaporized organic solvent generally has a risk of ignition. Therefore, the adhesives used for various purposes are rapidly being changed to water-based adhesives using water as a dispersion medium.

As a method of applying the above-mentioned water-based adhesive, a brush or a roller brush is mainly used in the case of manual work, and Euler is applied to a plastering iron for surface finishing of resin mortar or a narrow portion. The method of use is also known. On the other hand, as a coating method using an automatic device, there is known a method using a roll coater, a flow gun, a spray gun, a resin gun, a flow coater, an automatic doweling machine, a screen coater, etc.
There are known a spot coating method using a dispenser disclosed in Japanese Patent No. 31458 and a spray coating method disclosed in Japanese Patent Application Laid-Open No. 6-198229 for accurately coating a specific area.

[0004]

2. Description of the Related Art In the manufacture of shoes, for example, an adhesive agent is applied to each adhesive surface of a plurality of constituent members such as an instep, a midsole, and an outer sole, and then the constituent members are assembled by pressure bonding. In addition, these constituent members are relatively small in size, and the bonding surface thereof often has a complicated shape such as a curved surface. For this reason, conventionally, a brush whose application part is made of fibers such as animal hair or synthetic resin has been used to apply the adhesive to these adhesive surfaces.

[0005]

The above-mentioned conventional coating method using a brush has the following problems. (1) Generally, a water-based adhesive tends to increase in viscosity due to friction and water evaporation during application, has a faster film-forming property than a solvent-based adhesive, and has poor spreadability during application. Therefore, in the above-mentioned conventional coating method using a brush, the number of coatings increases,
It is easy to cause variations in adhesive strength due to uneven coating and increase in coating amount.

(2) When film formation is rapid, solid matter tends to adhere to the fibers which are the application parts of the brush, or the fibers tend to stick to each other and harden into a trowel. If it hardens in this way, the application part will not adapt to the adhesive surface of a complicated shape and the adhesive cannot be applied uniformly, so it is necessary to replace it with a new brush in a short time of, for example, about 30 minutes. For this reason,
Since it takes time for the bonding work to replace the brush, it is not easy to improve the working efficiency.

(3) In addition, it is extremely difficult to sufficiently remove the solid matter even if the brush has a solid matter adhered between the fibers, and it cannot be reused in many cases. Therefore, the life of the brush is short and the brush is discarded early, resulting in high cost.

(4) Since the application part of the brush is made up of a large number of fibers, when the application part is applied, the adhesive is applied in a streaky and non-uniform state, so-called brush lines are likely to occur. For this reason, the number of times of application and the amount of application tend to increase in an attempt to apply the adhesive evenly, and since the adhesive surface is applied unevenly, it is difficult to obtain stable quality because the adhesive strength is likely to vary.

The present invention solves the above problems, allows the applicator to be used satisfactorily for a long period of time, has a high work efficiency of adhesive application, can reduce the manufacturing cost, and has a complicated shape to be adhered. It is a technical object to provide a method for applying an adhesive, which can be evenly applied and can stably obtain high adhesive strength.

[0010]

In order to solve the above problems, the present invention is configured as follows. (1) When applying a water-based adhesive to the adhesive surface of an adherend, using an applicator having an application part made of a flexible foam,
After impregnating the water-based adhesive in the above-mentioned application part, by contacting this application part with the above-mentioned adhesion surface, the above-mentioned impregnated water-based adhesive is applied to this adhesion surface, Application method of agent, (2) The above-mentioned flexible foam has a measured value of hardness of 10 to 500 N according to the test method described in JIS K6401, and the application method of the aqueous adhesive described in (1) above, (3 ) The above flexible foam is made of polyurethane, polyolefin, polyvinyl chloride,
The method for applying the water-based adhesive according to (1) or (2) above, which comprises any one or more of polyvinyl alcohol, cellulose, natural sponge, silicone and synthetic rubber, and (4) the water-based adhesive described above. The adhesive component of the agent is a polyurethane adhesive, a polyacrylic adhesive, a polyvinyl acetate adhesive, a polyvinyl chloride adhesive, a polyvinyl alcohol adhesive, a polyolefin adhesive, a rubber latex adhesive, or starch. A method of applying the water-based adhesive according to any one of (1) to (3) above,
(5) The method for applying the water-based adhesive according to any one of (1) to (4), wherein the above-mentioned adherend is a constituent member of a shoe, and (6) the water-based adhesive is applied to the adherend. When applying to the adhesive surface, by using an applicator composed of a flexible foam, after impregnating the water-based adhesive into the above-mentioned application portion, by contacting the application portion with the above-mentioned adhesion surface, The method for suppressing film formation of an aqueous adhesive, which comprises applying the impregnated aqueous adhesive according to (7), wherein the flexible foam has a hardness measurement value of 10 to 500 N according to the test method described in JIS K6401. The method for suppressing film formation of an aqueous adhesive according to (6) above, (8) wherein the flexible foam is polyurethane, polyolefin, polyvinyl chloride, polyvinyl alcohol, cellulose, natural sponge, silicone and synthetic rubber. Of, any one kind or two
(6) The method for suppressing film formation of an aqueous adhesive according to (6) or (7), wherein the adhesive component of the aqueous adhesive is a polyurethane adhesive, a polyacrylic adhesive, or a poly The vinyl acetate adhesive, polyvinyl chloride adhesive, polyvinyl alcohol adhesive, polyolefin adhesive, rubber latex adhesive, or starch, according to any one of (6) to (8) above. (10) Any one of (6) to (9) above, wherein the adherend is a shoe constituent member.
(11) A method for manufacturing a shoe in which the constituent members of a shoe are bonded to each other to be assembled in the method for producing a film of an aqueous adhesive according to the item (1), wherein an applicator having an applicator part made of a flexible foam is used. A water-based adhesive is impregnated with, and the applied portion is brought into contact with an adhesive surface formed at a predetermined portion of a shoe constituent member to apply the impregnated water-based adhesive to the adhesive surface, and then each constituent member is (12) The method for manufacturing a shoe, characterized in that the shoes are assembled by crimping and fixing each other.
A shoe manufactured by the method described in 1.
3) An adhesive set, comprising an applicator having an application section made of a flexible foam and a water-based adhesive.

That is, the present invention 1 relates to a method for applying a water-based adhesive, and when the water-based adhesive is applied to an adhesive surface of an adherend, an applicator having an application portion made of a flexible foam is used to apply the water-based adhesive After the coating part is impregnated, the coating part is brought into contact with the adhesive surface to apply the impregnated water-based adhesive to the adhesive surface.

The present invention 2 relates to a method for suppressing film formation of a water-based adhesive, and when applying the water-based adhesive to an adhesive surface of an adherend, an applicator made of a flexible foam is used to apply the water-based adhesive to the above-mentioned application part. After being impregnated in, the application part is brought into contact with the adhesive surface to apply the impregnated aqueous adhesive to the adhesive surface.

The present invention 3 relates to a method for manufacturing a shoe, and in the method for manufacturing a shoe in which the respective constituent members of the shoe are adhered to each other to assemble, an applicator having an applicator part made of a flexible foam is used, and an aqueous adhesive is applied to the applicator part. After the agent is impregnated, the applied portion is brought into contact with the adhesive surface formed at a predetermined portion of the constituent member of the shoe, and the above-mentioned impregnated aqueous adhesive is applied to the adhesive surface,
It is characterized in that the constituent members are assembled by crimping and fixing each other.

A fourth aspect of the present invention relates to a shoe, which is characterized by being manufactured by the method of the third aspect.

A fifth aspect of the present invention relates to an adhesive set, which is characterized by comprising an applicator having an application part made of a flexible foam and a water-based adhesive.

The above-mentioned flexible foam refers to a cellular material made of a solid material, and its shape is not particularly limited,
Those formed of open cells are preferable. The hardness of this flexible foam is preferably 10 to 500 N as measured by the test method described in JIS K6401.

As the constituent material of the above-mentioned flexible foam,
Specific examples thereof include polyurethane, polyolefin, polyvinyl chloride, polyvinyl alcohol, cellulose, natural sponge, silicone, and synthetic rubber. These may be used alone or in combination of two or more. However, the flexible foam used in the present invention may be formed of another material.

As the above-mentioned water-based adhesive to which the present invention is applied, specifically, the adhesive component is a polyurethane-based adhesive,
Polyacrylic adhesive, polyvinyl acetate adhesive, polyvinyl chloride adhesive, polyvinyl alcohol adhesive,
A polyolefin adhesive, a rubber latex adhesive, or a water-based adhesive that is starch can be used, but it may be applied to water-based adhesives other than these.

The above-mentioned object to be adhered is not particularly limited, but it is particularly suitable for an object to be adhered having a complicated adhesion surface such as a curved surface or an uneven surface such as a constituent member of shoes.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method of applying an aqueous adhesive according to the present invention will be described in detail with reference to FIGS. 1 and 2, but these do not limit the scope of the present invention.

FIG. 1 is a perspective view showing an applicator used in the present invention, and FIG. 2 is a partially cutaway perspective view of a shoe manufactured using the present invention. As shown in FIG. 1, the applicator (1) comprises an application part (2) made of a flexible foam and a handle part (3) supporting the application part (2).

As shown in FIG. 1, the coating section (2) is
T-shaped cuts (4) in length along both sides
Are formed so that the upper sides of the T-shapes face each other. On the other hand, the handle part (3) has a forked holding part (5) at the tip.
The holding part (5) is inserted into each of the cuts (4), and the intermediate part (6) formed between the two cuts (4, 4) is inserted into the holding part (5). It is configured to be sandwiched between. The soft foam forming the coating part (2) is made of, for example, polyurethane, and a cold cure foam having a hardness measurement value of 250 N according to the test method described in JIS K6401 is used.

The shoe (10) shown in FIG. 2 is manufactured by assembling constituent members such as the instep (11), the midsole (12) and the outer sole (13) with each other. For the instep cover (11), for example, natural leather, woven cloth, synthetic leather, artificial leather, or resin such as PVC or polyurethane is used. The midsole 12 is made of resin sponge such as EVA or rubber sponge such as natural rubber or synthetic rubber. Further, for the outer sole (13), for example, natural leather, artificial leather, rubber such as natural rubber or rubber sponge, resin such as urethane or resin sponge is used.

A water-based adhesive suitable for each material is selected for each constituent member such as the instep (11), midsole (12), outer sole (13), etc. They are fixed to each other and assembled. In this assembly, for example, the midsole (12) and the outer sole (13) described above are bonded by the following procedure.

Adhesive surfaces (14) are formed on the lower surface of the midsole (12) and the upper surface of the outer sole (13) respectively. First, each adhesive surface (14, 14) is formed according to its material. Treat with a primer. The adhesive surface (14) may be buffed if necessary. Next, the application part (2) of the application tool (1) is impregnated with an aqueous adhesive, and the application part (2) is pressed against the adhesive surface (14) to remove the impregnated aqueous adhesive. Apply evenly to the adhesive surface (14). After that, the water-based adhesive applied to the adhesive surface (14) is dried and after a predetermined time elapses, the adhesive surfaces (14, 14) are heated and softened to be brought into contact with each other and fixed by pressure.

[0026]

[Experimental Example] Next, an experimental example will be described in which the application performance of the present invention using the above-mentioned applicator is compared with that of a conventional brush or the like.

The applicator used in the comparative example is as follows. That is, in Comparative Example 1, a brush whose coating portion was goat hair was used. In Comparative Example 2, a brush whose application portion was pig hair was used. In Comparative Example 3, a brush having a nylon fiber coating portion was used. Further, in Comparative Example 4, an applicator made of a rigid urethane foam whose application part is an open cell type was used.

As adherends, high-density foamed EVA (ethylene / vinyl acetate copolymer) used in the midsole of shoes and soft PVC (polyvinyl chloride) are used, and each has a width of 30 mm and a length of 100 mm. B. A sheet having a thickness of 2 mm was used.

The water-based adhesive used in the test was prepared as follows. 100 parts by weight of polycaprolactone diol (manufactured by Dow, trade name: TONE1270) was dehydrated under vacuum at 110 ° C, and then cooled to 60 ° C. Next, 7.9 parts by weight of hexamethylene diisocyanate, 7.0 parts by weight of isophorone diisocyanate (manufactured by Huls: trade name VESTANT IPDI), dimethylol butanoic acid (manufactured by Nippon Kasei: trade name DMB)
116 parts by weight of acetone was slowly added to 2.0 parts by weight of A), and the reaction was carried out while adjusting the temperature to 50 to 55 ° C. and stirring until the reaction rate reached 98% or more. Then, 1.3 parts by weight of triethylamine was added as a neutralizing agent to obtain a water-dispersible urethane prepolymer solution.

To the above water-dispersible polyurethane prepolymer solution, 120 parts by weight of distilled water was slowly added to give a milky white urethane prepolymer aqueous dispersion, which was then immediately cooled with amino alcohol (manufactured by Nippon Emulsifier Co., Ltd. (Name: amino alcohol EA) 1.4 parts by weight was added dropwise to carry out a chain extension reaction. The temperature at this time was adjusted to 30 ° C or lower. Then, after stirring at room temperature for 1 hour, 40-
By performing acetone removal under reduced pressure at 50 ° C., a polyurethane-based aqueous adhesive having a solid content of 50%, a viscosity of 300 mPa · s / 25 ° C. and a pH of 8.2 was obtained. In the evaluation of coating performance, a curing agent was added to 100 parts by weight of the water-based adhesive.
(Mitsui Takeda Chemical Co., Ltd .: trade name Takenate WD-730) was used by mixing 5 parts by weight.

The above water-based adhesive was applied to the adhesive surface of the adherend using the applicators of the above-mentioned embodiment and Comparative Examples 1 to 4, and the following evaluations were carried out. The results are shown in the comparison table shown in FIG.

(1) Evaluation of coating property (appearance of coating) When the above water-based adhesive was continuously applied to the high-density foamed EVA, the presence or absence of uneven coating over time was evaluated 5 minutes and 20 minutes after the start of coating. went. The evaluation results are indicated by ◯ when the coating is uniformly applied, Δ when the coating unevenness is small, and x when the coating unevenness is large.

(2) Continuous coatability and reusability The high-density foamed EVA was continuously coated with the aqueous adhesive with each applicator for 1 hour, and the solid content adhered to the coated portion during that period was evaluated as the continuous coatability. (○: No adhesion, Δ: Adhesion, ×: Coated part solidified). In addition, after leaving at room temperature for 5 minutes after application, the applicator was washed with water and the reusability of the applicator was evaluated by whether or not solid matter remained in the applicator (○: reusable, ×: reusable). unusable).

(3) Evaluation of Initial Adhesiveness After the above adherends were thoroughly degreased with ethyl acetate,
High density foam EVA primer (manufactured by MAXBOND:
Product name UV66) and primer for flexible PVC (MAXBO
Each of them was treated with a primer (trade name: VC-3K manufactured by ND Co.). Then, the above-mentioned polyurethane-based water-based adhesive was applied to both the above-mentioned adherends by the above-mentioned respective applicators and dried at 55 ° C. Then, after 5 minutes from the start of the adhesive application, or 20 minutes after the start of the adhesive application, the respective adhesive surfaces of the above-mentioned adherends are softened by heating and brought into contact with each other, and then pressure-bonded at 40 N / cm for 10 seconds. Then, it was left at room temperature for 5 minutes, and then the 180-degree peel strength was measured. The peel strength was measured at a peel speed of 50 mm / min.

As is clear from the measurement results shown in FIG.
In applying the water-based adhesive to the adherend, Comparative Examples 1 to 1
In the conventional coating method using the brush of No. 3, the brush marks are likely to be applied and uneven coating is caused, and the solid matter due to the film formation of the adhesive adheres to the coating portion, resulting in poor continuous usability and poor reusability. ing. In Comparative Example 2 and Comparative Example 3, since the fibers of the applied portion are harder, the continuous usability is slightly improved, but the water-based adhesive easily splashes, and when it is attempted to apply it uniformly, it is rather applied once. Therefore, it cannot be said to be suitable as an adhesive application method. Furthermore, Comparative Examples 1 to
In No. 3, since the brushes are easily attached to the applied adhesive, the adhesive strength varies.

When the coating part is made of a hard foam as in Comparative Example 4, the continuous application is excellent, but the coating appearance is poor (that is, uneven coating is large) and the adhesive strength is high. In addition, it is not suitable as a coating method because it causes variations in thickness and has low adaptability to complex shapes.

On the other hand, in the coating method of the present invention using the applicator in which the coating portion is made of a flexible foam, there is no coating unevenness in the coating appearance and the water-based adhesive is uniformly coated, and high adhesive strength is obtained. Stable expression. Further, it can be seen that the solid matter does not adhere to the coating portion even after long-time use, the applicator can be used stably for a long time, and the reusability is excellent.

In the above embodiment, the case where the present invention is applied to the manufacture of shoes has been described. However, the present invention is not limited to the constituent members of shoes such as automobile interiors, furniture, doors and partitions, and fittings. Needless to say, it can be applied to the adherend.

[0039]

Since the present invention is configured as described above, it has the following effects.

(1) Since the coating part is a flexible foam,
Since it is easily deformed when pressure is applied, it is easily adapted to the adhering surface of an object to be adhered having a complicated shape such as a shoe constituent member. Moreover, unlike the case of using the brush of the above-mentioned conventional technique, so-called brush eyes are not generated. For this reason, the water-based adhesive is easily and uniformly applied, and uneven adhesion hardly occurs, so that high adhesive strength can be stably obtained.

(2) Since the adhesive is easily and uniformly applied, the number of times of application can be reduced, and the formation of a film or solid matter due to thickening and drying of the adhesive is suppressed, and these solid matters are Adhesion to the application part is prevented. Therefore, unlike the above-mentioned conventional technique, the applicator can be used continuously for a long time, and the frequency of exchanging the applicator can be reduced. As a result, the work efficiency of applying the water-based adhesive can be improved.

(3) The number of times of application is small, there is no fear of increasing the application amount, the applicator can be used for a long time, and the application part is made of a flexible foam. Therefore, since it can be easily reused by washing, the application cost of the water-based adhesive can be reduced.

(4) Since the water-based adhesive is easily and uniformly applied, the water-based adhesive can be applied to a water-based adhesive that is easily dried and cured, and the number of water-based adhesive options can be increased.

[Brief description of drawings]

FIG. 1 is a perspective view showing an applicator used in the present invention.

FIG. 2 is a partially cutaway perspective view of a shoe manufactured by applying the present invention.

FIG. 3 is a comparison table showing the evaluation of the coating method of the water-based adhesive of the present invention and the comparative example.

[Explanation of symbols]

1 ... Applicator 2 ... Application section 3 ... Handle 10 ... shoes 11 ... Instep 12 ... Midsole 13 ... Outer sole 14 ... Adhesive surface

Front page continuation (51) Int.Cl. ⁷ identification code FI theme code (reference) B05D 7/00 B05D 7/00 NF term (reference) 4D075 AC47 AC52 CA12 DA32 DA33 DA34 DA35 DA36 DB16 DB20 DB31 DB32 DB38 DB50 DC38 EA06 EA23 EA35 EB07 EB10 EB13 EB15 EB19 EB22 EB38 4F042 AA01 AA27 AA28 AA29 AA30 FA21 FA22 FA26 FA31 FA33 FA45 4F050 CA08 HA77 KA06 NA32

Claims (13)

[Claims] 1. When applying a water-based adhesive to an adhesive surface of an object to be adhered, an applicator having an application part made of a flexible foam is used to impregnate the above-mentioned application part with the water-based adhesive, and then the application part is applied. A method for applying a water-based adhesive, characterized in that the above-mentioned impregnated water-based adhesive is applied to this adhesive surface by contacting the above-mentioned adhesive surface. 2. The flexible foam according to JIS K64
The hardness measured by the test method described in 01 is 10 to 50.
The method for applying the water-based adhesive according to claim 1, which is 0N. 3. The flexible foam is polyurethane,
The method for applying the water-based adhesive according to claim 1 or 2, which comprises one or more of polyolefin, polyvinyl chloride, polyvinyl alcohol, cellulose, natural sponge, silicone, and synthetic rubber. 4. The adhesive component of the above water-based adhesive is a polyurethane adhesive, a polyacrylic adhesive, a polyvinyl acetate adhesive, a polyvinyl chloride adhesive, a polyvinyl alcohol adhesive, a polyolefin adhesive. The rubber latex adhesive, or starch, according to claims 1 to 3.
The method for applying the water-based adhesive according to any one of 1. 5. The object to be adhered is a constituent member of a shoe,
The application method of the water-based adhesive according to claim 1. 6. When the water-based adhesive is applied to the adhesive surface of the adherend, an applicator made of a flexible foam is used to impregnate the water-based adhesive into the above-mentioned application portion, and then the application portion is subjected to the above-mentioned treatment. By contacting the adhesive surface, the above-mentioned impregnated water-based adhesive is applied to this adhesive surface,
Method for suppressing film formation of water-based adhesive. 7. The flexible foam is JIS K64.
The hardness measured by the test method described in 01 is 10 to 50.
The method for suppressing film formation of an aqueous adhesive according to claim 6, which is 0N. 8. The flexible foam is polyurethane,
The method for suppressing film formation of an aqueous adhesive according to claim 6 or 7, comprising any one kind or two or more kinds of polyolefin, polyvinyl chloride, polyvinyl alcohol, cellulose, natural sponge, silicone and synthetic rubber. 9. The adhesive component of the above water-based adhesive is a polyurethane adhesive, a polyacrylic adhesive, a polyvinyl acetate adhesive, a polyvinyl chloride adhesive, a polyvinyl alcohol adhesive, a polyolefin adhesive. 9. A rubber latex adhesive or starch, 9.
The method for suppressing film formation of an aqueous adhesive according to any one of 1. 10. The method for suppressing film formation of an aqueous adhesive according to claim 6, wherein the adherend is a shoe constituent member. 11. A method for manufacturing a shoe in which constituent members of a shoe are adhered to each other to be assembled, and an applicator having an application part made of a flexible foam is used, and the application part is impregnated with an aqueous adhesive. Is contacted with an adhesive surface formed at a predetermined position of a constituent member of the shoe, the above-mentioned impregnated water-based adhesive is applied to the adhesive surface, and then each constituent member is pressure-bonded and assembled to each other. , Shoe manufacturing methods. 12. A shoe manufactured by the method according to claim 11. 13. An adhesive set comprising an applicator having an application section made of a flexible foam and a water-based adhesive.