JP2599285B2 - Gelatin grinding method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for pulverizing gelatin used in a resin film, a resin film, a resin paint or the like.

(Prior Art) Gelatin is a kind of derived protein, which is insoluble in organic solvents, swells in cold water, dissolves in warm water to form a highly viscous sol, and has a concentration of 2-3% or more at room temperature. It is used as a modifier for synthetic rubber because of its characteristic of forming an elastic gel.

In addition, it has been attempted to mix a resin film with a resin film in order to produce a film having good stretchability and to have a moisture absorbing / releasing function by utilizing the same characteristics, and to produce a film having good water and air permeability.

Further, in order to provide a similar stretch property to a film or a coating film provided on the surface of various products, or to provide a moisture absorbing / releasing function, and further to simultaneously provide a water repellent function and a ventilation property, these films or Attempts have been made to incorporate gelatin into a resin solution or paint that produces a coating film.

As a result of many experiments, gelatin contained in these synthetic rubbers or resin films or resin coatings, resin coatings, etc., has a more specific effect as the particle size becomes finer. It has been found that it can lead to a coating or a resin coating.

In particular, by reducing the thickness of the resin film, in order to provide elasticity and moisture absorption / desorption properties and water repellency specific to the resin film, the particle size of the gelatin powder contained in the resin film is adjusted in a finer range. Needed.

Further, in order to provide a good touch feeling without sweatiness and a unique touch feeling on the surface of a coating film or a film formed on the surface of a product or the like, and a gelatin powder contained in the coating film or the film. It was convenient to align the particle size in a finer range.

Therefore, powder or granulated gelatin was pulverized with a dry ball mill or the like, and the resulting powder was classified before use.

(Problems to be Solved by the Invention) However, in such a conventional method, it is difficult to re-pulverize gelatin, and to produce a ground gelatin powder having uniform quality and uniform fine particle size. Could not.

Further, such a characteristic of gelatin is impaired, or a resin film or a resin film or a resin film produced using a crushed gelatin powder mixed with a gelatin powder having a relatively large particle size is peculiar to a resin film. There was a drawback that smoothness and feel to the touch were not provided, and these films, coatings, or coatings did not have a specific moisture absorbing / releasing function, stretching function, water repellent function, and the like due to gelatin mixed therein.

In particular, in the conventional method of simple pulverization using a dry ball mill, a large amount of heat is generated due to grinding, impact or shearing during the pulverization, and various inconveniences are caused by the generated heat.

First, there is a case where gelatin being pulverized is partially brought into a viscoelastic gel state due to heat generated during the pulverization,
It often occurs that the powder cannot be efficiently pulverized into a fine powder, or the powder or granular gelatin is fused to each other to form a viscoelastic mass. In particular, such inconveniences occurred remarkably, for example, when the water content of the gelatin to be pulverized was high, or when the gelatin was pulverized under humid conditions.

Then, when water is rapidly lost from the gelatin during the grinding due to the heat generated during the grinding, the hydrophilicity of the ground gelatin powder is inhibited, and there is a disadvantage that the function of swelling by water or dissolving out to warm water is lost, In particular, crushed gelatin powder based on crushing under such a condition that the water content in the crushed gelatin is less than 2% by weight is inherent in viscoelasticity such as hydrophilicity, adhesiveness or stretchability of gelatin powder. Had the disadvantage that the various properties of the above were impaired.

From such a point, in order to pulverize powder or granular gelatin by a dry ball mill, heat generated by friction or collision at the time of pulverization is accumulated as much as possible, or a long time so that this frictional heat is not excessively generated. , And it was necessary to grind slowly. For this reason, the pulverization efficiency of gelatin is poor, and the particle size of the finished pulverized gelatin powder must be kept within a relatively large range, so that a finer gelatin powder cannot be obtained.

Therefore, powder or granular gelatin is mixed and mixed with a liquid polymer or a resin solution diluted with various solvents, and the powder or granular gelatin is mixed and mixed with a liquid polymer or resin solution into a wet grinder and ground. Attempted to.

Such a wet pulverization method has disadvantages in that the flow resistance of the liquid polymer or the resin solution is large, stirring and pulverization are not performed smoothly, and the mixed gelatin is not uniformly dispersed in the polymer. In particular, when the stirring of this kind of liquid polymer or resin solution is continued, the viscosity of these polymer or resin solutions tends to increase with time, and it may be difficult to perform a smooth pulverization treatment by a wet pulverizer. In many cases, when the pulverization temperature in the pulverizer was increased with the stirring of the pulverizer, such inconvenience on pulverization tended to occur more remarkably.

Further, in the case of pulverizing gelatin with a dry ball mill, it is necessary to provide a cooling or exhaust device for removing the heat generated due to the friction or impact or a device for keeping the water content of gelatin constant in the device itself. However, there is a disadvantage that the crushing device itself becomes large.

Furthermore, when powder or granular gelatin is pulverized by a dry ball mill, the particle size of the gelatin powder produced due to various conditions such as temperature, humidity or the stirring speed of the ball in the pulverizer varies, and even when pulverized for a long time, There is a disadvantage that gelatin powder having a large particle size remains in gelatin powder having a fine particle size.

In particular, when powder or granular gelatin is pulverized by a conventional dry ball mill, the particle size ranges from 1.0 micron (measured on the short side in the case of elongated particles; hereinafter referred to as μm) to around 50 μm, which is extremely large. While gelatin powder having a fine particle size is produced, there is a disadvantage that a relatively large amount of gelatin powder having a relatively large particle size remains, and such a problem is the same even when grinding is continued for a long time.

As a result, when a sheet or film is formed by incorporating these gelatin powders into a resin material such as a polyurethane resin solution, a part of the mixed gelatin protrudes from the surface of the sheet or film, and this is applied to the surface of the sheet or film. In addition to giving a rough feeling, the edge of the large gelatin particles is likely to be cut off from the periphery of the sheet or the film, and the gelatin particles having the large particle diameter fall off the sheet or the film, or the sheet or the film from the portion. There was an inconvenience that cracks occurred on the surface.

In particular, the disadvantages due to irregularities in the particle size of the gelatin powder in the above description, the thickness of the formed film is 0.02 to 0.006 mm
Or a sheet, cloth,
Very thin 0.002m on the surface of leather, paper, or various molded products
When the gelatin powder was mixed and used as a coating having a thickness of about m or as a paint, it was remarkably generated.

Further, in the above-mentioned method of crushing gelatin powder with a dry ball mill and the method of using the crushed gelatin powder,
Granular or powdery gelatin is pulverized in a water content state of about 10 to 15% by weight, and the pulverized gelatin is mixed with various resin materials or paints in that state. However, when such a gelatin powder is mixed with a resin material or paint, the finer the gelatin powder to be mixed, the more difficult it is to disperse the resin material or paint,
In particular, when the target resin material is in the form of a viscous solution or when the coating liquid has viscosity, it has a disadvantage that it is not uniformly dispersed in these resin solutions or coating liquids. .

Furthermore, when this gelatin powder is mixed as a component of a paint film or a film of various articles, gelatin powder having a large particle size contained in the components of these paints or films forms a film or film. At the time, these coatings or the surfaces of the coatings have the disadvantage of causing streaky scratches or clogging of the spray gun.

In view of the disadvantages of the prior art, the present invention eliminates the adverse effect on the ground gelatin caused by the heat caused by the friction or impact generated during the grinding of the powder or the granular gelatin powder, and provides a short and uniform particle size. Crushing and molding of fine gelatin powder consisting of
Moreover, by preparing gelatin powder having a uniform particle size in suspension in a solvent without deteriorating the quality peculiar to gelatin, it is possible to mix gelatin powder smoothly and uniformly with various resin materials or paints. It is intended to be provided.

(Means for Solving the Problems) Assuming that the method of pulverizing gelatin according to the present invention achieves the above-mentioned objects, the invention of claim 1 provides fixed gelatin in powder or granular form and prepares the gelatin. Wet pulverization with a wet ball mill or the like mainly using an organic solvent in which gelatin such as dimethylformamide and toluene is insoluble, and this wet pulverization produces gelatin powder having a particle size smaller than 6 μm. The invention of claim 2 is characterized in that prior to the wet grinding in the invention of claim 1, the powder or granular gelatin to be ground is classified using a sieve or an air classifier or the like, and the powder or granular gelatin is classified. A gelatin having a particle size smaller than 50 μm is prepared as a gelatin having a particle size of at least 9% by weight or more based on the total amount of the gelatin. Of the present invention.

(Action) The method of pulverizing gelatin according to the present invention has the following action in view of the constitution described above.

First, in the invention of claim 1, grinding is performed in a state where the ground gelatin powders are in close contact with each other by the presence of a solvent,
There is no impact and the gelatin powders are always in contact with each other with a solvent interposed therebetween, so that the gelatin powders do not adhere to each other during pulverization or adhere to the surface of the pulverizer.

In addition, since the heat generated by the grinding and impact during the grinding is absorbed by the solvent, and the surface of the ground gelatin powder is covered with the solvent, the characteristics of the gelatin accompanying the heat generation are not impaired, There is no softening or hardening.

In particular, since the gelatin being pulverized is shielded from the outside air by the solvent, water is released from the gelatin during the pulverization, or the gelatin during the pulverization absorbs moisture and swells, or becomes viscoelastic. , Does not cure.

Therefore, the pulverized gelatin charged in the solvent is always pulverized under the same conditions, so that the pulverization can be continued under the same conditions until the target particle size is reached.

In the invention of claim 2, since the particle size of the gelatin to be pulverized is adjusted to a certain range, pulverization by a wet pulverizer is performed.
The gelatin powder having the desired particle size can be obtained in a shorter time, and the particle size of the ground gelatin powder is substantially uniform.

(Example) Hereinafter, a typical example of the method for pulverizing gelatin according to the present invention will be described.

Usually, solid gelatin prepared as tasteless or odorless white powder or transparent flakes (here, gelatin is mainly industrial gelatin, but any of various properties and concentrations of gelatin may be used. Basically, it is put into a wet pulverizer such as a wet ball mill together with a solvent such as dimethylformamide and triene in a state of air-dry moisture content (water content when left in the air = equilibrium moisture content). Then, the gelatin is pulverized in a state where the gelatins are not in contact with each other and are not ground by the solvent. In the pulverization using a pulverizer such as a wet ball mill, the particle size of the pulverized gelatin powder is 6 μm.
The process is continued until a finer range is obtained.

Also, in order to make the particle size of the gelatin powder crushed by this wet crusher uniform and to crush the crushed gelatin to the target particle size in a short time, classify the gelatin powder put into the wet crusher. The fine gelatin powder whose gelatin powder belongs to a range finer than 50 μm is preferably classified by a sieve or an air classifier so as to be 90% by weight or more of the total amount of the gelatin powder.

The solvent used in the above description is an organic solvent as a typical example, and a resin material such as a resin solution mixed with the ground gelatin or a solvent suitable for a paint containing the ground gelatin is used. This solvent requires gelatin to be insoluble, and typically uses dimethylformamide, toluene, methyl ethyl ketone, etc., as well as methanol, isopropyl alcohol, n
-Butanol, benzyl alcohol, ethyl acetate, butyl acetate, acetone, methyl isobutyl ketone, cyclohexane, tetrahydrofuran, dioxane, xylol, nitropropane, ethane dichloride, trichlorethylene, perchlorethylene, methylcellosolve,
Ethyl cellosolve is used.

Since such solvents are insoluble in gelatin,
Even if gelatin is mixed with the gelatin, the gelatin does not swell or melt, and the water in the gelatin is not absorbed by the solvent and the gelatin is not hardened.
Also, in the process of pulverizing gelatin, gelatin introduced into the solvent is pulverized in the same state as when mixed into the solvent.

Using such a solvent as a wet medium, granular or powdered gelatin is charged into a pulverizer to perform a pulverization process.

This pulverizing apparatus may be any apparatus as long as it is suitable for wet pulverization of powders or granular materials, and is mainly used among various types of ball mills.

Further, the pulverization by the pulverizer is continued until the particle size of the input granules or powdered gelatin becomes finer than 6 μm. Therefore, the grinding conditions such as the grinding time by the grinder are as follows: the capacity of the grinder, the diameter and the amount of the balls used in the grinder, the type and the amount of the gelatin to be charged into the grinder, and the usage. Solvent type and input amount,
It may be changed as needed depending on various conditions such as the stirring speed of the pulverizer and the pulverizing temperature. It is.

Further, in the embodiment according to the second aspect of the present invention, in order to make the pulverization by the pulverizer more effective, the pulverized gelatin is preliminarily pulverized, and the preliminarily pulverized gelatin is classified by air volume classification or bulk by a true specific gravity. The particle size is made uniform by sieving classification, and is usually prepared by pulverization using a dry pulverizer such as a turbo mill.

As described above, in the wet pulverization using a solvent in which gelatin is insoluble as a pulverizing medium, gelatin during pulverization does not dissolve, swell, or harden by the solvent and is shut off from the outside air. Since it is ground in a crushed state, it has a feature that there is no moisture absorption and desorption phenomenon of gelatin during the grinding. As a result, in the process of grinding the gelatin, the water content of the gelatin is not increased, and the gelatin does not fuse with each other or become soft and unsuitable for grinding or impact grinding. In addition, the quality does not deteriorate until the water content of the gelatin is lowered in the process of grinding the gelatin to inhibit the hydrophilicity. The gelatin powder pulverized in this manner is used together with a solvent at the time of pulverization for molding a paint or a resin.

Example 1 Gelatin was pulverized with an air-dry moisture content by a turbo mill,
This was classified to prepare the following gelatin powder. Although the water content of this gelatin powder was 12% by weight, it was possible to use gelatin powder having a water content in the range of 5 to 15% by weight in actual grinding of the gelatin powder.

29.85 μm or more and less than 42.21 μm 25.9 wt% 21.10 μm or more and less than 29.85 μm 26.1 wt% 14.92 μm or more and less than 21.10 μm 21.5 wt% 10.55 μm or more and less than 14.92 μm 11.2 wt% 7.46 μm or more and less than 10.55 μm 6.3 wt% 5.27μm or more to less than 7.46μm 4.4% by weight 3.73μm or more to less than 5.27μm 1.4% by weight 2.63μm or more to less than 3.73μm 1.4% by weight 1.69μm or more to less than 2.63μm 0.8% by weight 1.01μm or more to less than 1.69μm 0.6% by weight 0.66 μm or more and less than 1.01 μm 0.4% by weight 0.43 μm or more and less than 0.66 μm 0.0% by weight The above gelatin powder was charged into a pulverizer at a ratio of 30 parts by weight to 100 parts by weight of dimethylformamide. 70% by volume of alumina-based balls with a diameter of 3 mm and 30% by volume of a solvent containing gelatin powder were added to this crusher and stirred for 60 minutes to obtain gelatin powder having the following particle size. Was.

3.73 μm or more to less than 5.27 μm 11.0 wt% 2.63 μm or more to less than 3.73 μm 25.6 wt% 1.69 μm to less than 2.63 μm 18.4 wt% 1.01 μm or more to less than 1.69 μm 16.5 wt% 0.66 μm or more to less than 1.01 μm 15.5 wt% 0.43 μm or more to less than 0.66 μm 7.5 wt% 0.34 μm or more to less than 0.43 μm 5.2 wt% 0.24 μm or more to less than 0.34 μm 0.3 wt% Example 2 Granulated or powdered gelatin obtained by the above-mentioned turbo mill has a 3 mm diameter of zirconia. Of the ground gelatin powder was reduced to 6 μm or less in 90 to 120 minutes by a pulverizer filled with the balls.

50% by volume of gelatin mixed with 100 parts by weight of toluene (volume ratio) 50% by volume of zirconia balls having a diameter of 3 mm (volume ratio) The amount of gelatin powder mixed with the solvent depends on the properties of the solvent, especially There is an appropriate amount depending on the degree of viscosity of the solvent, and dimethylformamide has a higher viscosity than toluene. Therefore, it is necessary to reduce the blending amount of gelatin powder from toluene.

Further, when the amounts of gelatin and the solvent to be charged into the pulverizer are increased, much pulverization time is required to obtain the above-mentioned gelatin powder having a particle diameter of 6 μm corresponding to the increase. In addition, when the diameter of the ball charged into the crusher was increased, the crushing time was shortened. However, there was a tendency for large-diameter gelatin powder to remain, and for a ball having a diameter larger than necessary. When used, gelatin powder having a uniform particle size could not be obtained.

In addition, when the gelatin powder was pulverized with a wet ball mill using dimethylformamide without previously adjusting the particle diameter of the gelatin powder as in Example 1 above, the use of gelatin powder having a uniform particle diameter was reduced. It was necessary to lengthen the grinding time by about 30 minutes. And, even with this pulverization, a fine and uniform gelatin powder smaller than 6 μm could be produced.

The gelatin powder pulverized by the above-mentioned method was determined to have the following characteristics during the pulverization process and the produced gelatin powder.

First, the granular or powdered gelatin charged into the crusher is
This gelatin is made insoluble, it is taken up mainly in an organic solvent, and gelatin is crushed in a state of being wrapped by this solvent, so that gelatin does not fuse with each other, Also, there is no fusing to the surface of the ball or the pulverizer. In particular, the heat generated by the grinding or impact of the ball is not dispersed and directly transmitted to the gelatin by the solvent, and there is no fear that the gelatin is deteriorated by the heat or the gelatin is fused. In addition, since the gelatin is pulverized in a state covered with the solvent, in the pulverization process of the gelatin, the gelatin becomes wet and swells or becomes sol-like, or in the pulverization process due to the evaporation and heating of the water. No gelling phenomenon occurs. Therefore, the gelatin mixed with the solvent contains the water content when mixed in the solvent, and does not impair the swelling function specific to gelatin or the properties such as hydrophilicity and specific viscoelasticity. Also, it is possible to reliably and easily produce a fine gelatin powder having a uniform particle size without making it difficult to pulverize due to the dampness of gelatin and the increase in viscosity with heating during the pulverization process of gelatin. Can be.

Furthermore, the gelatin powder obtained by the pulverization has a particle size smaller than 6 μm in any case according to the above-mentioned pulverization method, and is not fused or entangled with each other. In addition, it has a feature that it is uniformly dispersed in the solvent used for pulverization, and that gelatin powder is generally dispersed like a suspension.

Each of the gelatin powders in these solvents floats in the solvent in an independent state, and is completely shielded from the outside air. This facilitates the management of the pulverized gelatin powder, and the pulverized gelatin powder does not become wet, harden, or fuse with each other.

The gelatin powder thus ground is mixed with a molding resin or paint together with the solution used for grinding the gelatin powder. The method and amount of the compounding are appropriately determined according to the characteristics of the resin product, film or sheet to be molded, the characteristics of the paint, and the like.

The resin to which the solvent having the gelatin powder is blended,
It is a resin suitable for forming a film, a film or a paint film to be produced, and is made into a solution by the above-mentioned solvent. That is, usually, the above-mentioned gelatin powder is pulverized using a solvent suitable for a resin material such as a resin film or sheet to be formed.

Therefore, by selecting a solvent and a resin material used for the wet pulverization, molding of various resin films and sheets, formation of various resin films, and various resin coatings are produced.

The resin and the coating liquid to be mixed in the solvent containing the gelatin powder may be in the form of a paste or a powder or a liquid, and the paste or the viscous liquid may be adjusted by adjusting the amount of the solvent. It is a high solution or a low viscosity dilute solution.

Thus, a film or a sheet or a film and a coating material are produced using the resin or the coating solution containing the solvent. As a method for producing the film or sheet, an appropriate method such as calender roll, inflation molding or the like is used. In addition, there is a method of coating the surface of the release paper and then peeling the release paper to produce a film or sheet. In addition, various kinds of films are coated and formed on the surface of cloth, paper, leather or wood products or other products, a method of immersing cloth, paper, or the like in a resin solution containing the solvent, and a surface of release paper. After coating, the resin film on the release paper surface is created by a method of transferring and bonding to a surface of cloth, resin sheet, paper, leather or the like. Further, the paint is prepared by adding a solvent having the above-mentioned gelatin powder as a part of the film-forming auxiliary element or as an improvement or extender element to the film-forming element and the pigment adapted to various uses. Yes, produced by general stirring and mixing.

Films, films and paint films produced in this way belong to a range in which the particle size of gelatin powder contained in these materials is finer than 6 μm. Even when the thickness is in the range of 0.02 to 0.002 mm, these films, coatings or coated gelatin powder do not protrude or protrude from the surface of the coating film, and the film or film has a smooth and good touch feeling. Or it was a coating.

Also, by eluting a part of the gelatin powder contained in the resin molded product such as a film, a film or a coating film produced as described above, a few microns Many finer holes can be provided.

By providing pores finer than 2-3 μm on the surface of the film, film or coating, the film, film or coating is provided with air permeability. The air permeability provided to the membrane is characterized in that water vapor having a particle size of about 0.0004 μm is allowed to pass, and water droplets are not allowed to pass. From this, water resistance and moisture permeability can be imparted to the film, film or coating.

Therefore, a coating or coating having a thickness of 0.02 to 0.002 mm containing the above-mentioned gelatin powder is formed on the surface of various fabrics, leather or wood products or the like, or a film is adhered thereto, and this coating, coating or film is formed. When the gelatin powder is eluted, water resistance and moisture permeability specific to these fabrics, leathers, wood products, and the like are brought. Incidentally, the diameter of a normal raindrop is 2000 μm, and even a fine raindrop is 100 μm, so that it does not pass through fine holes provided in these films and the like. Also, the raindrops adhering to the film surface and the like do not infiltrate through the fine holes due to the surface tension.

Example 3 A polyurethane resin film was prepared using the above-mentioned solvent containing gelatin powder, and this film was transferred to the surface of a woven or knitted fabric.

Gelatin powder finer than 6 μm 10 parts by weight Toluene 70 parts by weight Polyurethane resin solids 30 parts by weight This resin solution is applied to the surface of release paper with a doctor knife coating method to a thickness of 0.008 mm, and after drying, The film was peeled off from the release paper to form a 0.008 mm thick film.

Further, the release paper was peeled off while adhering to the surface of the nonwoven fabric having a thickness of 1.5 mm without peeling the film, thereby forming a film skin layer on the surface of the nonwoven fabric. And this non-woven fabric
When immersed in hot water at 60 ° C. and washed with hot water for 15 minutes, gelatin powder contained in the film disappeared corresponding to 35% by weight of the total amount.

A film was prepared by increasing the mixing amount of the gelatin powder between 3 parts by weight and 30 parts by weight in increments of 5 parts by weight. The film surface had good gloss and sufficient waist strength, but had a sticky feeling during bonding.
On the other hand, the film surface containing 35 parts by weight of gelatin powder has a contact resistance unique to gelatin and has a good touch, but when a strong force acts on the film surface, wrinkles are formed on the film surface, and In the case of a product laminated with a film, the underlying fabric surface was partially exposed in a state where the surface was distorted. Therefore, the compounding amount of the gelatin powder is 3 to
30 parts by weight is optimal. However, the amount of the gelatin powder can be further changed depending on the type of the resin for forming the film, the amount of the solvent used, the molding conditions, and the like.

In addition, the elution of the gelatin powder by the above-mentioned hot water washing is such that, as the temperature of the hot water used is increased, a large amount of the gelatin powder can be eluted in a short time, but the film or the laminated film is damaged or the base is damaged. There is a disadvantage that the resulting fabric is damaged. From this, it is necessary to comprehensively consider the type of fabric to be laminated, the material characteristics and the material characteristics of the film itself, the amount of gelatin powder contained in the film, and the amount of gelatin powder eluted from the film. Then, the gelatin powder contained in the film, the film or the coating film is eluted. Incidentally, in the polyurethane resin film of the above example, it is ideal to make the contained gelatin powder elute with hot water or hot water at 60 to 150 ° C. Long hours were needed.

Example 4 70 parts by weight of toluene 70 parts by weight of gelatin powder finer than 6 μm 30 parts by weight of polyvinyl chloride resin The flexibility of the PVC film produced in Example 4 is significantly increased, and the elasticity is remarkably increased as compared with a conventional PVC film. In addition, a moisture absorption function was provided. In addition, a paint was produced together with the formation of the film and the film by the above-mentioned amount.

Example 5 Toluene 70 parts by weight Gelatin powder finer than 6 μm 10 parts by weight Acrylic resin 30 parts by weight The film produced with the compounding ratio of Example 5 has excellent weather resistance and good abrasion resistance, but is in contact with the film. The film had the characteristic of no stickiness at the time, and the film surface had good gloss. Further, when a film was formed with the resin solution having the above mixing ratio and a coating film was formed as a coating material, a film or a coating film having excellent abrasion resistance and a moisture absorbing function was obtained.

Example 6 70 parts by weight of toluene 70 parts by weight of gelatin powder finer than 6 μm 10 parts by weight Polyvinyl chloride resin 15 parts by weight Acrylic resin 15 parts by weight The film produced with the compounding ratio of this Example 6 has a higher abrasion resistance than the film of Example 5 above. Although the properties tended to be inferior, the feel was good and the adhesiveness at the time of lamination was good. or,
The film formed using the resin solution having the above mixing ratio and the film formed using the paint containing the resin solution have good hygroscopicity and contact resistance, and have an appropriate touch.

Example 7 A gelatin powder was pulverized in toluene, a two-part reaction type urethane paint was mixed with toluene having the pulverized gelatin powder, and then an isocyanate was added and mixed to obtain a coating film having a thickness of 0.006 mm with a spray gun. .

This coating film was excellent in matting effect, and the texture when touched by hand was good without stickiness. In this example,
A coating film was formed in the range of 10 to 40% by weight of gelatin powder based on the total weight of polyester and gelatin powder in the two-pack reaction type urethane resin paint.

Example 8 A liquid urethane resin liquid (non-yellowing one-component polyurethane, non-volatile content: 30%) was mixed with a mixture of methyl ethyl ketone for 20 minutes.
~ 50 poise (25 ° C), 50 parts by weight of gelatin powder mixed with 100 parts by weight of this urethane resin together with toluene,
The mixture was stirred and mixed to 100 poise (25 ° C.). This mixture was sprayed on a PVC plate with a spray gun and dried at 100 ° C. for 1 minute to obtain a coating film having good hygroscopicity and a high matting effect.

Example 9 A mixture obtained by mixing a solvent containing 30 parts by weight of gelatin powder in 100 parts by weight of a urethane resin was coated on release paper, and a 0.006 mm-thick film obtained after drying was used as a textile substrate. It was transferred to and bonded. The surface of the woven fabric thus produced had no stickiness and was excellent in feel.

Example 10 A one-pack type urethane resin containing gelatin powder (a mixed solution containing 30% by weight of non-volatile components using methyl ethyl ketone containing gelatin powder as a solvent) was coated on a release paper with a comma roll and dried.
Further, on this coating layer, a two-pack type urethane resin containing gelatin powder (a mixed solution of 50% by weight of non-volatile content using methyl ethyl ketone containing gelatin powder as a solvent) is applied and dried to form a laminated film. The film was peeled off from the release paper and laminated to the surface of the nonwoven fabric. The surface of the non-woven fabric having the laminated film was free of stickiness and had the same adhesive strength as the laminating adhesive containing no gelatin powder.

(Effects) In the method of pulverizing gelatin according to the present invention, the gelatin powders are pulverized in a state of being separated by the solvent, so that the gelatin powders do not directly touch and fuse with each other.

Further, there is no generation of heat due to grinding or impact pulverization at the time of pulverizing the gelatin powder, and there is no inconvenience of fusion between the gelatin powders or deterioration of quality due to heat change.

Further, since the gelatin powder is pulverized while being covered with the solvent, the gelatin powder does not dry or swell during the pulverization process. Thus, there is no inconvenience that the hydrophilicity is not hindered by the drying of the gelatin powder, and the gelatin powder becomes viscous with the swelling and the pulverization is hindered.

From these facts, it was possible to reliably and efficiently produce a gelatin powder having a particle size in a range smaller than 6 μm.

Furthermore, since the finely ground gelatin is dispersed in a solvent in a suspended state, the blending with a molding resin such as a film, a sheet or a film is facilitated and facilitated.
It has the feature that gelatin powder is uniformly dispersed in these resin mixtures. Such a feature is the same even when gelatin powder pulverized by a solvent is used as a coating component together with the solvent.

Therefore, when a film, film or coating is formed using a resin mixture or a coating containing gelatin powder belonging to a range finer than 6 μm, the gelatin powder is uniformly dispersed in these films, films or coatings. These films and the like are formed in a state where they are dispersed in the film. From this, these films and the like, the moisture absorption and desorption properties of gelatin,
It has the features of providing appropriate contact resistance and elasticity, and preventing electrostatic charging.

Further, since the particle size of the gelatin powder contained in these films, sheets, films or coatings is finer than 6 μm, it has been possible to form these films, sheets, films or coatings thinly. . In particular, a film or film having a thickness of 0.006 mm and a coating film having a thickness of 0.002 mm are produced. The powder did not protrude or protrude, and had a good touch and a smooth surface.

In addition, since the gelatin powder is uniformly exposed on the surface of the formed film, film or coating, the surface of these film, coating or coating effectively absorbs moisture and has a good touch. A feeling is brought.

Further, when the gelatin powder mixed in is eluted from the surface of the film, film or coating film to be formed, countless fine pores of several microns are formed on the surface of these film, film or coating film. It has a characteristic of providing a moisture absorbing / releasing function specific to the surface of a film or the like, particularly a water / moisture permeable function.

In addition, when the surface of the film, film or coating film formed above is subjected to a sanding treatment, the moisture absorption function, the water-resistant and moisture-permeable function of the gelatin powder contained in the film and the like, and the good touch feeling are further improved. Will be encouraged.

The method for crushing gelatin according to the present invention, and films, coatings and paints using gelatin powder obtained by this crushing method, are characterized by the characteristic contents described above. In addition to being used as interior materials and the like, it is used as various electronic devices and keyboards for these operators, etc. by utilizing the characteristics of not taking static electricity.

In addition, the above-mentioned films, films and coatings having gelatin powder may be produced or used by the same method or method as the usual film forming method or film forming method or film forming method not containing gelatin powder. can do. For this reason, the films, films and coatings using the crushed gelatin powder according to the present invention can be used as means for molding or cosmetics of all commodities in daily life.

Claims (2)

(57) [Claims] A powder or granular gelatin is pulverized by wet pulverization using a solvent such as dimethylformamide, toluene or the like as a medium, and the pulverized gelatin powder has a particle diameter smaller than 6 microns. Method for grinding gelatin. 2. A gelatin powder or granules having a particle size of less than 50 microns which is classified into at least 90% by weight or more of the total weight.
The classified gelatin powder or granules are pulverized by wet pulverization using a solvent such as dimethylformamide or toluene as a medium, and the pulverized gelatin powder has a particle size smaller than 6 microns. Grinding method.