JPS5876252A - Hair implanted product - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flocked hair product that is breathable, voluminous, and has excellent recovery elasticity.

In conventional flocked products, the adhesive layer that adheres short fibers to the base material is formed of a continuous thin coating layer, which not only lacks breathability but also lacks volume.
Even if a stretchable base material was used, its stretchability could not be fully demonstrated. Therefore, in order to eliminate these drawbacks, for example, foamed vinyl chloride leather (knitted back side)
has been used as a base material, or flannel, which has a voluminous feel, or double knit, etc., have been used as a base material.

However, in these methods, there were differences in bar length and shortness. For example, PVC leather has many problems during dry cleaning. That is, the pile may come off because there is no good adhesive to adhere to PVC leather, or the plasticizer used in PVC leather may be extracted and the texture may become hard.

Furthermore, even if flannel or double knit with a voluminous feel is used, it is difficult to obtain a flocked product with the desired soft texture. In particular, flannel or double knits with a voluminous feel are very expensive, so the final result is an expensive flocked product that is not suitable. , Japanese Patent Publication No. 53-1770, etc., methods of maintaining the adhesive layer in a foamed state are being adopted. However, in this method, according to Utility Model Publication No. 50-221, the adhesive (emulsion) used is 55 to 60%
It is said that it is preferable to have a solid content of 2 times or less and an expansion ratio of 2 times or less. It is true that commercially available emulsion is foamed and used as an adhesive in that state.
Furthermore, when used as a coating agent, the strength is significantly reduced when the foaming ratio is expanded to 2 times or more. Moreover, since the concentration is high and the foaming ratio is high, the surface of the foamed emulsion dries quickly, resulting in a marked decrease in flocking properties. Furthermore, this method has fatal drawbacks such as the foaming ratio being less than 2 times, which results in a slightly inferior sense of volume, and a lack of rebound resilience.

Therefore, in order to eliminate these drawbacks, the inventors of the present invention,
We have discovered the use of foamable microspheres that foam at relatively low temperatures, and have also achieved excellent workability and flocking fastness even when the resin concentration of the adhesive is 55% or less and the foaming ratio is more than double. We have developed a method using foam adhesive for flocking. However, it has been found that these two methods, foaming using microspheres and mechanical foaming using adhesive, each have the following disadvantages. That is, when using microspheres, (1) it is not possible to obtain air-permeable flocked products;

(2) When a very voluminous feel or a high level of cushioning properties are required, the amount of microspheres used must be considerably increased. Microspheres are very expensive and therefore tend to cost too much.

On the other hand, in the case of mechanical foaming, (1)
In order to achieve a very high foaming ratio, it is necessary to increase the gauge and thickness of the doctor so that a larger amount of coating can be applied than would normally be the case.

Difficult to coat other materials.

(2) If the foaming ratio is lowered, coating will be easier, but the volume and rebound will be poor.

That's true.

Therefore, the inventors of the present invention have continued to conduct further studies, and as a result of intensive research into the formation of a more suitable hair transplant product, the above-mentioned drawbacks have been resolved by using microspheres and further using mechanical foaming in combination. I came to discover that it is possible.

That is, foamable microspheres that foam at a relatively low temperature are mixed and dispersed in the adhesive used, and air is further mechanically mixed with an oak mixer type or whipper type, and
The adhesive is made into a foam, and the foamed adhesive is applied to the base material by doctor coating or roll coating, flocked using the commonly used electrostatic flocking method, and pre-dried at 70 to IOQ℃. and then 120-1
Heat-treated at 50℃ to expand the microspheres in the adhesive layer, creating a voluminous and breathable product with a mixture of expanded microspheres in the adhesive layer and continuous foam voids made of air.
Thus, it is an object of the present invention to provide an improved flocked product having not only voluminous feel and rebound properties but also excellent air permeability. It is something.

Therefore, the characteristics of the flocked product of the present invention, which is suitable for such purposes, is that it is a product in which short fibers are flocked on the surface of the base material through a foamed adhesive layer, and the foamed adhesive layer 14 fl. It is formed of an expanded sphere made by heating and foaming expandable microspheres wrapped in a polymer, and a second layer containing mechanical foam foamed with air, and the base end of the flocked short fiber is the base material. The point is that it is fixed to the top surface of the foam adhesive layer without reaching the surface.

The specific contents of Section 6 will be further detailed below.

First, the expandable microspheres referred to in the present invention are microspheres that are made of a thermoplastic polymer encapsulating a foamable substance and foam at a relatively low temperature, and a typical manufacturing method thereof is as follows:
For example, it is described in detail in Japanese Patent Publication No. 42-265.24, but generally limited, coalescence, and polymerization
ce Polymerization).

Here, as the thermoplastic polymer constituting the foamed microspheres, polystyrene, polymethacrylic acid ester, polyvinylidene chloride, a copolymer of vinylidene chloride with acrylonitrile, a copolymer of acrylonitrile and methyl acrylate, etc. Commonly used effervescent substances, on the other hand, include ethylene, propane, butene, neopentane, and hexane.

An aliphatic hydrocarbon having a boiling point below the softening point of the thermoplastic polymer, such as heptane, is used. These thermoplastic polymers and foamable substances can be selected as appropriate depending on the adhesive used and the type of flocked product to be obtained. The most suitable materials are polyvinylidene chloride, a copolymer of vinylidene chloride and acrylonitrile, and a copolymer of acrylonitrile and methyl acrylate.
ν. However, it goes without saying that it is not limited to this.

The size of these expandable microspheres is usually 1 to 50 microns in diameter before foaming, but from the viewpoint of effectiveness, it is
0 micron is preferred.

These expandable microspheres are mixed into the adhesive described later and heated and foamed to promote foaming of the adhesive layer, creating a foamed layer, and exist as expanded spheres in the foamed adhesive layer, giving the adhesive layer volume. It gives a feeling and recovery elasticity.

On the other hand, in contrast to the expanded spheres, the foamed adhesive layer of the present invention further contains bubbles foamed with air, thereby imparting air permeability to the flocked product. This foam is obtained, for example, by foaming an adhesive emulsion by mechanical means, such as a foaming device, and generally has open cells. The expansion ratio of this foam during foaming is 1.2 to 5 times, preferably 1.5 to 3 times, the initial volume.

However, the expansion ratio is related to the amount of expandable microspheres added, and when the amount of expandable microspheres added is 2 to 3%, the expansion ratio is optimally 1.5 to 2.5 times.

This foaming is usually performed after mixing and blending the expandable microspheres.

Examples of adhesives used for flocking include synthetic rubber latex such as natural rubber latex, nitrile rubber, styrene rubber, chloroprene rubber, styrene-butadiene rubber, and nitrile-butadiene rubber, polyvinyl chloride, polyvinylidene chloride, Synthetic resin emulsions such as polyvinyl acetate, acetic acid-acrylonitrile copolymer, and polyacrylic ester are used, but the most commonly used adhesive for flocking is acrylic ester. Sometimes synthetic latexes such as SBR, NBR, etc. are used in combination. Of course, in the present invention, any adhesive can be used as long as the resin film has some degree of elasticity, but the most suitable adhesive is an acrylic ester adhesive. Among these, the acrylic emulsion, which was developed by the present inventors and is suitable for mechanical foaming, is the most suitable.

Therefore, in the hair transplantation method for obtaining the hair transplantation product according to the present invention, firstly, 0.5 to 5%, preferably 1 to 5%, of the expandable microspheres are added to the adhesive used, such as an acrylic emulsion.
Add 3% and stir to evenly disperse. Next, it is necessary to appropriately adjust the viscosity of the formulation, but the viscosity of acrylic emulsions generally used for hair transplantation can be adjusted freely with aqueous ammonia. For the present invention, a range of 10,000 to 15,000 cps is suitable.

It is also possible to use other mitsufuners in combination to adjust the viscosity. In addition, melamine resin (for example, product name Sumitera pVH3), urea resin or epoxy resin, which has been commonly used for the purpose of further improving strength,
It is also possible to use a urethane resin or the like in combination, and it is also possible to occasionally add a pigment.

In order to make the adhesive with such a blend and viscosity adjusted into a foamed state, a known method such as an oak mixer can be used.
It can be foamed by mechanical means such as a mold or a whisker mold. Keep the adhesive in a foamed state for a long period of time, e.g.
A foam stabilizer may be used in combination for the purpose of maintaining stability for 8 hours or more, at least 20 hours. Examples of such foam stabilizers include ammonium salts of higher fatty acids such as oleic acid, stearic acid, and lauric acid, sodium lacryl sulfate, and diammonium-N-alkyl sulfate 7-osuccinate.

The expansion ratio of the adhesive according to the present invention is 1.
It is 2 to 5 times, preferably 1.5 to 3 times. As mentioned above, the expansion ratio is related to the amount of foamable microspheres mixed, but the optimal combination is when the amount of microspheres is 2 to 3% and the expansion ratio is 1.5 to 2.5 times. be. Outside this range, if the amount of microspheres is small and the foaming ratio is low, the volume feeling 1 impact resilience is good, but there is a problem in robustness.

Next, the foamed adhesive is applied to the surface of the substrate by a known application method, such as roller coating or doctor coating. The amount of coating at this time is 50 to 2 as solid resin content.The base material on which short fibers are flocked is a knitted or nonwoven fabric made of natural fibers such as cotton or rayon, or recycled cellulose fibers or synthetic fibers such as polyester or polyamide. A breathable material is used.

The short fibers to be flocked include natural fibers such as cotton and wool, polyester, polyamide, and wool.

It can be any short fiber, including synthetic fibers such as lyacrylonitrile, and its fineness and length are appropriately selected depending on the use and purpose of the flocked product to be obtained.

゛Thus, the flocked base material is dried as described above, and the adhesive is cured while keeping it in a foamed state.However, in the conventional flocking process, drying is performed at 80°C to 80°C as the first step.
Dry at 100℃ for 3 to 8 molecules, then as a second step 1
3-5 at 20-160℃, generally 140-150℃
Heat treatment for minutes. However, according to the present invention, it is preferable not to expand the microspheres during pre-drying, so pre-drying is preferably carried out at as low a temperature as possible for a short time.

Regarding the heat treatment conditions, heat treatment can be performed for up to 5 minutes at 120° C., but if heat treatment is performed for classification reasons, the volume will decrease on the contrary. In the case of 150° C., heat treatment within 3 minutes is most preferable.

In the flocked product obtained in this way, the short fiber pile rises as the adhesive layer foams, and the short fibers float above the base material surface and are fixed by the foamed adhesive layer, creating a voluminous feel that cannot be obtained with conventional flocked products. It is a flocked product with rebound resilience and excellent breathability.

FIG. 1 of the accompanying drawings is a diagram showing an outline of the structure of the flocked product thus obtained, in which (1) is a base material, (2) is a layer deposited on the surface of the base material (1), and a foamed adhesive layer (3) integrally adhered to the base material (1) by its own material.
) is a short fiber whose base end is fixed to the upper surface of the foam adhesive layer (2), is separated from the surface of the base material (1), and is substantially supported by the thickness of the foam adhesive layer (2); Layer (2)
The above-mentioned expandable microspheres (4) are foamable microspheres that foam at a relatively low temperature and are made by wrapping the foamable material in a thermoplastic polymer.
and mechanically foamed foam (4) that is foamed with air.

The flocked product of the present invention having the above-mentioned structure has the above-mentioned excellent properties due to the presence of the foam adhesive layer, and can be used not only for materials but also for clothing.

The advantages and advantages of the hair transplantation product of the present invention are listed below.

(1) A flocked product that is breathable, has a voluminous feel, and is rich in rebound elasticity can be obtained.

(2) The amount of microspheres used may be as small as 0.5 to 5%, preferably 1 to 3%, and the mechanical expansion ratio may be 1.2 to 5 times, preferably 1.5 to 2. The foaming ratio is easily obtainable at .5 times.

(3) The adhesive used can be a commercially available emulsion with a concentration of 40 to 50%, which has a concentration of 55% or less.

(4) Even if an adhesive that forms a flexible film whose secondary transition point of the adhesive resin film is 110°C or less, for example -40°C, is used, the voluminous feel and rebound resilience are maintained well.

Next, the present invention will be explained in more detail with reference to Examples.

Example First, foamed microspheres were manufactured by the following method.

In a pressure-resistant polymerization reactor equipped with a stirrer, 100 parts by weight of distilled water and 30% by weight colloidal silica dispersion water (trade name 0at) were added.
15 parts by weight of aliod (manufactured by Catalysts Kagaku Kogyo Co., Ltd.) were charged. To this mixture, 2.5 parts by weight of a 10% by weight aqueous solution of a copolymer obtained by a condensation reaction from an equimolar ratio of jetanolamine and adipic acid was added to obtain a viscosity of approximately 100°'p'/2.
A product was obtained at 5°C. Next, 1 part by weight of a solution containing 2.5% by weight of potassium dichromate was added, and the pH of this aqueous solution was adjusted to 4 using hydrochloric acid.

An oil phase mixture was prepared using 100 parts by weight of vinylidene chloride as a monomer, 20 parts by weight of neopentane as a foaming substance, and benzoyl peroxide as a catalyst.
The oil phase mixture was added to the water phase while stirring vigorously with a stirrer blade rotating at a speed of ,000 rpm. The reactor was then sealed and the reaction mixture was maintained at approximately 55° C. for 24 hours.

During the reaction period, gentle stirring was continued, and after the reaction period was over, the temperature of the reaction mixture was lowered to near room temperature. The reaction mixture had a white appearance similar to milk. The reaction mixture was filtered and the microspheres were taken out and dried in a dryer at about 30°C.

The expandable microspheres obtained were 5-8 microns.

Using the thus obtained expandable microspheres, a flocked product was subsequently manufactured by the following method. That is, 82.4 parts by weight of butyl acrylate, 10 parts by weight of acrylonitrile, 36 parts by weight of acrylic acid, 4 parts by weight of N-methylolated acrylamide were used, and 1 part by weight of polyvinyl alcohol (degree of polymerization: 5009 parts) was added during polymerization. was added to prepare a polymerized heel-ac 1-nor type self-thickening and self-crosslinking emulsion.

To 100 parts by weight of this emulsion (solid content concentration 45%) were added 1 part by weight of aqueous ammonia and 1.5 and 2.3 parts by weight of the expandable microspheres produced by the above method, respectively, to prepare a dispersion. Then, these dispersions were mixed into 1 ml using a foaming device.
．． The foamed dispersion was applied to a base fabric of Moss 9A at a coating amount of 250 (-), and rayon short fibers of 0.7 denier x 0.7 m were flocked, and the mixture was heated at 100°C for 3 to 3 times. Pre-dried for 3 minutes, then heat treated at 150℃ for 3 minutes,
A flocked product of the present invention was created.

On the other hand, for comparison, a flocked product was produced in the same manner without adding foamable microspheres, and a flocked product was produced in the same manner without foaming using a foaming device.

The thus obtained flocked products of the present invention and comparative flocked products were then measured for volume, bending/bending repulsion, and air permeability, respectively, and the results shown in Table 1 were obtained.

In addition, in the above table, "volume feeling" is the value measured by a thickness measuring device, and it was determined that the larger the measured value, the more voluminous the feeling.

In addition, "bending resistance" is a value measured according to JIS L-1079 (cantilever method), and "repulsion elasticity" is a value measured by taking a sample with a width of 2 cm and a length of 15 to 20 crn from a flocked product. was bent as shown in Figure 2, and the length (L) at which the bent part no longer recovered was measured, and it was determined that the larger the measured value, the better the recovery.

As is clear from the results in Table 1 above, the comparative flocked product without the addition of expandable microspheres and without foaming using a foaming device had poor volume, poor rebound, and poor air permeability. In addition, flocked products in which expandable microspheres are added and foaming is not performed using a foaming device have excellent volume and rebound, but have poor air permeability. In contrast, the flocked product of the present invention had excellent volume and rebound properties, and also had good air permeability.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a flocked product of the present invention, and FIG. 2 is an explanatory diagram of a method for measuring the rebound resilience of the flocked product. (1)・・・・・・・・・・Base material. (2)...--Foamed adhesive layer. (3)・・・・・・・・・Short fiber. (4)......Expanded spheres made of foamable microspheres that are heated and foamed. (5)・・・・・・・・・ Foam created by air.

Claims (1)

[Scope of Claims] 1. A flocked product in which short fibers are flocked on the surface of a base material via a foam adhesive layer, the foam adhesive layer being a foamed product in which a foamable material is wrapped in a thermoplastic polymer. It contains expanded spheres made by heating and foaming sex microspheres and bubbles whipped with air.
A flocked product characterized in that the base ends of the flocked short fibers do not reach the surface of the base fabric and are fixed on the surface of the foam adhesive layer. 2. The hair flocking product according to claim 1, wherein the foamable substance of the foamable microspheres is neopentane. 8. Claims in which the thermoplastic polymer of the expandable microspheres is a polymer selected from polyvinylidene chloride, a copolymer of vinylidene chloride and acrylonitrile, or a copolymer of acrylonitrile and methyl acrylate. The flocked microspheres according to claim 1 or 2 have a density of 1 to 3% based on the solid content of the adhesive, according to any one of claims 1 to 8. hair transplant products.