JPH01294772A - Grinding of gelatin, resin film, resin coat and coating - Google Patents

Abstract

PURPOSE:To obtain ground gelatin improved in the uniformity of particle diameters without detriment to the properties characteristic of gelatin by wet- grinding powdery or particulate gelatin in the presence of a solvent. CONSTITUTION:A powdery or particulate gelatin (A) at least 90wt.% of which comprises a 50mum or smaller tasteless, odorless white powder or transparent thin flake is wet-ground in the presence of a solvent (B) in which component A is insluble (e.g., toluene) to obtain a suspension containing component A of a particle diameter <=6mum. This suspension is used as a resin film-forming component, a resin coat-forming component or a coating component.

Description

Detailed Description of the Invention (Industrial Field of Application) This invention relates to a method for pulverizing gelatin used as a mixture in resin films, resin coatings, resin paints, etc., and a resin film and resin using the pulverized gelatin powder. Concerning the provision of films and resin coatings.

(Prior art) Gelatin is a type of derived protein, and has the characteristics of being insoluble in organic solvents, swelling in cold water, dissolving in hot water, and forming a highly viscous sol. It is used as a modifier for synthetic rubber because of its ability to form an elastic gel at room temperature.

In addition, attempts have been made to incorporate them into resin films in order to make use of similar properties to create films with good stretchability, moisture absorption and desorption functions, and water resistance and air permeability.

Furthermore, in order to provide similar stretch properties to the films or coatings provided on the surfaces of various products, to provide moisture absorption and desorption functions, and furthermore to provide water repellency and breathability properties at the same time, these films are being developed. Alternatively, attempts have been made to mix gelatin into the resin solution or paint that creates the coating film.

As a result of many experiments, the finer the particle size of gelatin contained in these synthetic rubbers, resin films, resin films, resin coatings, etc., the more specific effects it has. It is clear that this effect can be applied to films or resin coatings.

In particular, in order to make the resin film thinner and thereby provide the elasticity, moisture absorption and desorption properties, and water repellency that are unique to the resin film, the particle size of the gelatin powder contained in the resin film should be made uniform within a finer range. There was a need.

In addition, in order to provide the coating film or coating surface formed on the surface of the product, etc. with smoothness, a good texture without sweaty feeling, and a unique texture, the gelatin powder contained in the coating film or film may be used. It was advantageous to arrange the particle sizes within a finer range.

Therefore, gelatin, which had been in the form of powder or granules, was re-pulverized using a ball mill, etc., and then used after being classified.

(Problems to be Solved by the Invention) However, the conventional method of rinsing has difficulty in re-pulverizing gelatin, resulting in uniform quality.

Moreover, it has not been possible to produce pulverized gelatin powder having a uniform and fine particle size.

In addition, the inherent properties of gelatin may be impaired in this way, or resin films, resin films, or resin coatings made using crushed gelatin powder mixed with gelatin powder of relatively large particle size may have certain characteristics. They do not provide smoothness or feel to the touch, and have the disadvantage that gelatin mixed in these films, membranes, or coatings does not provide the characteristic moisture absorbing and releasing functions, elastic functions, water repellent functions, etc.

In particular, in conventional methods such as simple grinding using a dry grinder, impact grinding, or shear grinding, a large amount of heat is generated due to grinding, impact, or shearing, and various types of heat are generated due to this heat generation. caused inconvenience.

First, the heat generated during pulverization may partially turn the gelatin into a viscoelastic gel state, which often makes it impossible to efficiently pulverize it into a fine powder, or cause it to become powder or granules. There was a disadvantage that the gelatin fused together to form a viscoelastic lump. In particular, the inconvenience is
If the gelatin to be crushed has a high moisture content,
Alternatively, the problem occurred significantly when gelatin was pulverized under humid conditions.

Next, if water is rapidly lost from the gelatin being ground due to the heat generated during grinding, the hydrophilicity of the ground gelatin powder will be inhibited, and the gelatin powder will swell with water or lose its ability to elute with hot water. Ground gelatin powder that is ground under conditions such that the water content in the ground gelatin is less than 2% by weight has properties such as hydrophilicity, viscoelasticity, adhesiveness, and elasticity inherent to gelatin powder. It had the disadvantage that various properties were impaired.

From this point of view, in order to crush powdered or granular gelatin using conventional methods, the heat generated due to friction or collisions during crushing must be accumulated as much as possible, or the heat generated due to collisions must be kept for a long time so that this frictional heat is not excessively generated. I had to take my time and slowly grind it down. For this reason, the gelatin pulverization efficiency was poor, and the particle size of the finished pulverized gelatin powder had to be kept within a relatively large range, making it impossible to obtain finer gelatin powder.

Therefore, powder or granular gelatin is mixed with a liquid polymer or a resin solution diluted with various solvents, and the liquid polymer or resin solution mixed with powder or granular gelatin is placed in a wet grinder and pulverized. An attempt was made to do so.

In the wet grinding method, the flow resistance of the liquid polymer or resin solution is large, and stirring and grinding cannot be performed smoothly, and the mixed gelatin is not uniformly dispersed in the polymer. In particular, if this type of liquid polymer or resin solution is continued to be stirred, the viscosity of these polymers or resin solutions tends to increase over time, making it difficult to grind them smoothly using a wet grinder. In many cases, when the grinding temperature in the grinder was increased as the grinder stirred, the above-mentioned problems in grinding tended to occur even more markedly.

In addition, the equipment itself for grinding powdered or granular gelatin must be equipped with a cooling or exhaust device to remove the heat generated due to friction or impact, or a device to keep the moisture content of gelatin constant. The device itself had the disadvantage of being large-scale.

Furthermore, when powder or granular gelatin is crushed using conventional methods, the particle size of the gelatin powder produced varies depending on various conditions such as the temperature, humidity, and stirring speed of the pole inside the crusher, and due to long-term crushing, However, there is a problem in that gelatin powder with a large particle size remains in the gelatin powder with a fine particle size.

In particular, when powdered or granular gelatin is pulverized by conventional methods, the particle size ranges from 1.0 microns (in the case of elongated grains, measured on the short side and hereinafter expressed as μ-) to around 50 μ-. Although gelatin powder with an extremely fine particle size is produced, there is the disadvantage that gelatin powder with a relatively large particle size is considerably crushed, and the disadvantage of crushing remains the same even when grinding is continued for a long time. .

As a result, when a sheet or film is formed by incorporating gelatin powder into a resin material such as a polyurethane resin solution, some of the mixed gelatin protrudes from the surface of the sheet or film, causing roughness on the surface of the sheet or film. In addition to giving a sticky feeling, edge breakage is likely to occur between the peripheral edge of the large gelatin particles and the sheet or film, and the large gelatin particles may fall off the sheet or film, or the sheet or film may break from the chain. This had the disadvantage of causing cracks on the surface of the film.

In particular, the inconvenience associated with the uneven particle size of the gelatin powder mentioned above is that the thickness of the formed film is 0.02~0.
When it is made into an ultra-thin form like oos■-, or when it is used to create an ultra-thin film of about 0.002m on the surface of sheets, fabrics, leather, paper, or various molded products, it can also be used as a paint. This was noticeable when gelatin powder was used.

In addition, in the method of pulverizing gelatin powder and the method of using the pulverized gelatin powder according to the conventional method described above, granular or powdered gelatin is pulverized to a water content of about 10 to 15% by weight, and then It is mixed with various resin materials or paints in its raw state. However, when mixing such gelatin powder with a resin material or paint, the finer the gelatin powder mixed, the more difficult it is to be smoothly dispersed into the resin material or paint. When the material is in the form of a viscous solution or when the coating liquid is viscous, it has the disadvantage that it cannot be uniformly dispersed in these solutions or coating liquids.

Furthermore, when this gelatin powder is mixed as a component of paint films or films of various articles, the gelatin powder with large particle size contained in the constituent elements of these paints or films may cause the formation of the paint film or film. In this case, there is an inconvenience that streak-like scratches are caused on the surface of these coatings or coatings, or that the spray gun is clogged.

In view of the inconveniences in the conventional methods, the present invention eliminates the adverse effects on the crushed gelatin caused by the heat accompanying friction or impact that occurs during the crushing of gelatin powder in the form of powder or granules, and achieves uniform particle size in a short time. It is possible to crush and mold fine gelatin powder consisting of a variety of resin materials or other materials by preparing gelatin powder with a uniform particle size as a suspension in a solvent without sacrificing the unique quality of gelatin. The aim is to provide gelatin powder that mixes smoothly and uniformly with paint.

(Means for Solving the Problems) The method of pulverizing gelatin according to the present invention, the resin film, resin film, and paint using the pulverized gelatin powder are as claimed in claim 1. In the present invention, solid gelatin in the form of powder or granules is prepared, and this gelatin is wet-pulverized in a wet ball mill or the like using a mainly organic solvent in which gelatin is insoluble, such as dimethylformamide or toluene. Gelatin powder having a particle size smaller than 6 μm is produced by wet pulverization, and the invention of claim 2 provides that, prior to the wet pulverization in the invention of claim 1, the gelatin powder or granular gelatin to be pulverized is The powdered or granular gelatin is classified using a sieve or an airflow classifier, and the powder or granular gelatin is prepared as a powder or granular gelatin that is at least 90% by weight of the total amount of gelatin. Gelatin having a uniform diameter is ground by the same method as in the invention of claim 1.

In addition, the invention of claim 3 is that the resin film contains gelatin powder in a finer range than 6μ, which is wet-pulverized using a solvent as a medium in the invention of claim 1. The gelatin powder pulverized in the pulverized gelatin powder is blended with a resin material together with the solvent used as a wet medium used for the pulverization to produce a film mainly having a thickness of 0.02 to 0.006 m. The invention of claim 1
Gelatin powder finer than 6μ, which is ground using a solvent as a medium, is used as a component of the molding resin solution for a resin film, together with the solvent contained in this ground gelatin powder, and the gelatin powder finer than 6μ is ground into the resin film formed based on the invention of This allows gelatin belonging to a certain range to be uniformly mixed into the gelatin.

Furthermore, in the invention of claim 5, the ground gelatin powder, which is finer than a 6 μm gelatin powder wet-ground using a solvent, is blended into a paint together with a solvent as a containing medium to form a paint component. .

(Function) The method of pulverizing gelatin according to the present invention, the films and coatings in which this pulverized gelatin is part of the composition, and the paints in which the solvent containing this pulverized gelatin is part of the paint component are described below. Considering the structure, it has the following effects.

First, in the invention of claim 1, the ground gelatin powders are not ground or impacted in a state in which they are in close contact with each other due to the presence of a solvent, and the gelatin powders are always in contact with each other through the presence of a solvent. Therefore, the gelatin powders do not weld together during pulverization or adhere to the surface of the pulverizer.

In addition, the heat generated due to the grinding and impact during crushing is absorbed by the solvent, and since the surface of the crushed gelatin powder is covered with the solvent, the properties of gelatin are impaired due to this generated heat. Will not crack, soften or harden.

In particular, since the gelatin being crushed is shielded from the outside air by the solvent, water may be released from the gelatin being crushed, or the gelatin being crushed may absorb moisture and swell or become viscoelastic. , never hardens.

Therefore, the pulverized gelatin placed in the solvent is always pulverized under the same conditions, and pulverization can be continued under the same conditions until the desired particle size is reached.

In the invention of claim 2, since the particle size of the gelatin to be crushed is arranged within a certain range, gelatin powder having the desired particle size can be obtained by pulverization using a wet pulverizer in a shorter time. The particle size of the pulverized gelatin powder is generally uniform.

In the invention of claims 3 to 5, gelatin powder in the form of a fine powder, which is finer than 6 μm, is suspended in a solvent to form a film or coating, or as an element of a paint component. As a result, the molding resin and paint for the film or coating can be mixed smoothly and reliably with this pulverized gelatin powder, and the pulverized gelatin powder is uniformly dispersed in the film, coating, and coating. are doing. In addition, since the gelatin powder contained in this film, coating, or paint belongs to a range finer than 6μ, these gelatin powders may stand out from the formed film, coating, or paint film. It is not exposed in a protruding manner.

(Example) Hereinafter, a method of pulverizing gelatin according to the present invention, a film and a coating having gelatin powder pulverized by this pulverizing method as a part of the composition, and a paint having a similar gelatin powder as a part of the paint component. A typical example will be described.

First, to explain the embodiments of the invention of claims 1 and 2, solid gelatin (here, gelatin is mainly used is industrial gelatin), which is usually prepared as a tasteless and odorless white powder or transparent flakes. gelatin of various properties and concentrations, including glue) is basically dimethylated at air-dried moisture content (moisture content when left in the air = equilibrium moisture content). The gelatin is put into a wet grinder such as a wet ball mill together with a solvent such as formamide or toluene, and the gelatin is ground in a state where the gelatin is not brought into contact with each other and ground by the solvent. The pulverization using a pulverizer such as a wet ball mill is continued until the particle size of the pulverized gelatin powder becomes finer than 6 μm.

In addition, in order to make the particle size of the gelatin powder crushed by this wet crusher uniform, and to grind the gelatin to the desired particle size in a short time, it is necessary to classify the gelatin powder to be fed into the wet crusher. It is preferable to classify fine gelatin powder, which is finer than 50 μm, using a sieve or air classifier so that it accounts for 90% by weight or more of the total amount of gelatin powder.

Incidentally, the solvent used in the pick-up process is typically an organic solvent, and a solvent that is compatible with the resin material such as the resin solution in which this ground gelatin is mixed or the paint in which this ground gelatin is mixed is used. The solvent must be insoluble in gelatin and typically includes dimethylformamide, toluene, methyl ethyl ketone alcohol, n-butanol, benzyl alcohol,
Ethyl acetate, butyl acetate, acetone, methyl isobutyl ketone, cyclohexane, tetrahydrofuran, dioxane, quidylol, 2-nitropropane, ethane dichloride, trichlorethylene, verchlorethylene, methyl cellosolve, ethyl cellosolve, etc. are used.

Since gelatin is not soluble in these solvents, gelatin will not swell or dissolve even if gelatin is mixed with it, and the water etc. in gelatin will be absorbed by the solvent and gelatin will not dissolve. It does not harden. Further, in the process of pulverizing gelatin, the gelatin added to the solvent is pulverized in the same state as when it was mixed into the solvent.

Granular or powdered gelatin is charged into a pulverizer using such a solvent as a wet medium and subjected to pulverization treatment.

This grinding device may be any device as long as it is suitable for wet grinding of powder or granular materials, and among various ball mills, those suitable for wet grinding are mainly used.

Further, the pulverization by this pulverizer is continued until the particle size of the introduced grains or powdered gelatin becomes finer than 6 μm. Therefore, the grinding conditions such as the grinding time of this grinder are determined by the capacity of the grinder, the diameter and amount of balls used in this grinder, the type and amount of gelatin fed into this grinder, and the amount used. The quality of the crushed gelatin is determined by pulverizing the gelatin within a range that does not raise the solvent temperature during pulverization as much as possible, although this may change from time to time depending on various conditions such as the type and amount of solvent to be added, the stirring speed of the pulverizer, and the pulverizing temperature. This is necessary to prevent deterioration of the

Further, in the embodiment according to the invention of claim 2, in order to make the pulverization by the above-mentioned pulverizer more effective, the gelatin to be pulverized is pre-pulverized, and the gelatin is subjected to air volume classification by true specific gravity or sieve by bulk. The particle size is made uniform by dividing the edges, and it is usually prepared by grinding with a dry grinder such as a turbo mill or a jet mill.

In this way, in wet grinding using a solvent in which gelatin is insoluble as a grinding medium, the gelatin being ground does not dissolve, swell, or become hard due to the solvent.

Furthermore, since the gelatin is crushed in a state completely isolated from the outside air, it has the advantage that there is no moisture absorption or desorption phenomenon of gelatin during the crushing process. As a result, during the process of grinding gelatin, the moisture content of gelatin increases and the gelatin fuses together.
It does not become soft and unsuitable for grinding or impact grinding, nor does the gelatin quality deteriorate to such an extent that the water content of the gelatin is reduced during the grinding process and its hydrophilicity is inhibited.

The gelatin powder thus pulverized is used together with the solvent used in the pulverization to form paints or resins.

Example 1 Gelatin was pulverized in an air-dried state with a moisture content using a turbo mill, and this was classified to prepare the following gelatin powder. The moisture content of this gelatin powder was 12% by weight, but in actual pulverization of gelatin powder, it was possible to use gelatin powder with a moisture content in the range of 5 to 15% by weight.

29, 85 μm or more to 42.21 μm or more 25°9% by weight21.10) l to 29.85 J)
2B, 1) 114.92 // ~21.
10 /7 21.5 ) 110.55 n
~14.92 II 11.2)17.
46 // ~10.55 ti 6.3
n5.27 n ~? , 46 //
4.4 //3.73 // ~5.27
) l 1.4 ) J2.63 tt ~
3.73 n 1.4 nl, 69 t
t ~ 2.63 n Q, ll /71,
01 n ~ 1.69 ll O, 6nO
,66// ~1.01 ti Q, 4/
10.43 // ~0.66 ti Q
, Q n The gelatin powder described above was charged into a grinder at a ratio of 30 parts by weight to 100 parts by weight of dimethylformamide. For this grinder, 70% by volume of alumina balls with a diameter of 3 mm and 30% by volume of solvent containing gelatin powder.
When the gelatin powder was added and stirred for 60 minutes, gelatin powder having the following particle size could be obtained.

3.73 μ or more ~ less than 5.27 μ■ 11.0% by weight
2,63 1J ~3.73 // 2
5.6 //1.69 /7 ~2.63
n 18.4 ul, 01 // ~1.
69 n 16.5 /10.66 /
/ ~1.01 // 15.5 ttO
,43// ~0.66 II 7.5
IIO, 34// ~0.43 n 5
．． 2 /70.24 n ~Q, 34 /
/Q, 3 //Example 2 When the granulated or powdered gelatin crushed in the turbo mill described above was crushed in a crusher filled with silicone balls with a diameter of 31111 under the following conditions, the particle size of the crushed gelatin powder was 6 μl. It took 90 to 120 minutes to achieve the following.

50% (volume ratio) mixed solution of 100 parts by weight of toluene and 50 parts by weight of gelatin 50% (volume ratio) silicone balls with a diameter of 3 mm The amount of gelatin powder mixed in the solvent depends on the properties of the solvent,
In particular, there is an appropriate amount depending on the degree of viscosity of the solvent.
Since dimethylformamide has a higher viscosity than toluene, it is necessary to use less gelatin powder than toluene.

Furthermore, when the amount of gelatin and solvent added to the pulverizer is increased, a lot of pulverization time is required to obtain gelatin powder with a particle size of 6 μm corresponding to the increased amount. Although the grinding time was shortened by increasing the diameter of the balls fed into the grinder, there was a tendency for large-diameter gelatin powder to remain. Using this method, it was not possible to obtain gelatin powder with uniform particle size.

In addition, as in Example 1, gelatin powder was pulverized in a wet ball mill using dimethylformamide without changing the particle size of gelatin powder in advance, and gelatin powder with uniform particle size could be used. In comparison, it was necessary to increase the grinding time by approximately 30 minutes. Even with this pulverization, it was possible to produce gelatin powder that was finer than 6 μm and more uniform.

The gelatin powder pulverized by the above method was found to have the following characteristics in the pulverization process and the gelatin powder produced.

First, the granular or powdered gelatin that is fed into the grinder is taken into a mainly organic solvent in which the gelatin is insoluble, and the gelatin is surrounded by the solvent. Since the gelatin is crushed, the gelatin does not fuse to each other or to the surface of the ball or the grinder.In particular, the heat generated due to grinding or impact of the ball is dispersed by this solvent. The gelatin is not directly transferred to the gelatin, so there is no risk of gelatin deterioration or gelatin melting due to heat, and since the gelatin is crushed while being covered with the solvent, this gelatin crushing During the process, gelatin does not become moist and swell or become sol-like, nor does gelation occur due to the transpiration and heating of water during the grinding process. It is said to contain the moisture content at the time of mixing, and does not impair gelatin's unique swelling function or properties such as hydrophilicity and unique viscoelasticity.Also, gelatin becomes moist and heated during the grinding process Fine gelatin powder having a uniform particle size can be reliably and easily produced without making grinding difficult due to the viscosity associated with it.

Furthermore, when the gelatin powder obtained by pulverization is obtained by the above-mentioned pulverization method, the particle size is finer than 6 μm, and the gelatin powder has the feature that it does not fuse or intertwine with each other. Moreover, it has the feature that it is uniformly dispersed in the solvent used for grinding, and the gelatin powder is generally dispersed in a suspension-like manner.

The gelatin powders in these solvents are individually suspended in the solvent, and are completely shielded from the outside air. This makes it easy to manage the crushed gelatin powder, and the gelatin powder does not become moist, harden, or fuse together after being crushed.

The thus pulverized gelatin powder is blended into a molding resin or paint together with the solution used to pulverize the gelatin powder. The blending method and blending amount are appropriately determined depending on the characteristics of the resin product, film or sheet to be molded, the characteristics of the coating material, etc.

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

Therefore, by selecting the solvent used in the wet grinding described above, various resin films, sheets, etc. can be formed, various resin coatings can be formed, and various resin paints can be produced.

In addition, the resin and coating liquid mixed in the solvent containing gelatin powder may be in the form of a paste, powder, or liquid, and by adjusting the amount of the solvent, it can be made into a paste or viscous form. It is in the form of a high solution or a dilute solution with low viscosity.

In this way, a film or sheet, or a membrane, and a paint are created using a resin or a coating liquid mixed with a solvent.The method of creating this film or sheet is by using an appropriate method such as calendar roll molding, inflation molding, etc. There are methods such as coating the surface of a release paper and then peeling off the release paper to make a film or sheet. In addition, various films can be formed by coating the surface of cloth, paper, leather, wood products, or other products, by soaking a piece of cloth in a resin solution containing the above-mentioned solvent, and by using release paper. After coating the surface, the resin film on the release paper surface is transferred and adhered to the surface of cloth, resin sheet, paper, leather, etc.The paint is created by a method such as transferring and adhering it to the surface of cloth, resin sheet, paper, leather, etc.Furthermore, the paint is a film-forming element suitable for various uses. The above-mentioned gelatin powder or other solvent is added to the pigment and the gelatin powder as part of the coating film forming auxiliary element or as an improving or bulking element, and is produced by stirring and mixing on a boat.

Films, membranes, and painted coatings produced in this way are made with gelatin powder contained in these materials having a particle size of 6.
Since it belongs to a range finer than μ■, the thickness of the film, coating, or paint film is 0.02 to 0.002
Even within the range of m+a, mixed gelatin powder may come out from the surface of these films, membranes, or painted coatings, or
The result is a film, coating, or coating that is smooth and has a good texture without protruding.

In addition, by eluting a part of the gelatin powder contained in the resin molded product such as the film, membrane, or coating created as described above, it is possible to dissolve a few microns on the surface of the film, membrane, or coating, etc. It is also possible to provide a large number of fine holes.

By providing pores finer than 2 to 3 microns on the surface of a film, coating, or coating, these films, coatings, or coatings are provided with air permeability. The breathability provided by the membrane is characterized by the passage of water vapor having a particle size of around 0.0004 μm, but not the passage of water droplets. From this, water resistance and moisture permeability can be imparted to the film, film, or coating.

Therefore, a film or coating film containing the gelatin powder with a thickness of 0.02 to 0.002III is formed on the surface of various fabrics, leather, wooden products, etc., or a film is bonded to the surface of the product. Alternatively, when the gelatin powder in the film is eluted, the water resistance and moisture permeability characteristic of these fabrics, leather, wooden products, etc. are brought about. Incidentally, the diameter of a normal raindrop is 200 Gam, and even a fine drizzle is 100 μl, so it does not pass through the minute holes provided in these films, etc., and it does not adhere to the surface of these films. Even raindrops do not seep through the fine pores due to surface tension.

Example 3 A polyurethane resin film was made using a solvent containing the gelatin powder, and this film was transferred onto the surface of a woven or knitted fabric.

Gelatin powder finer than 6 µm Overlay part Toluene 70 parts by weight Polyurethane resin Solid content 30 parts by weight This resin solution was applied to the surface of release paper to a thickness of 0.008 mm using the doctor knife coating method. After drying, it was peeled off from the release paper to form a film with a thickness of 0.008 mm.

In addition, without peeling off this film (while adhering it to the surface of a 1.5 sam thick nonwoven fabric, the release paper was peeled off to create a film skin layer on the surface of the nonwoven fabric. Then, this nonwoven fabric was soaked in hot water at 60°C). When the film was soaked in hot water and washed for 15 minutes, 35% by weight of the gelatin powder contained in the film disappeared.

In addition, when films were made by increasing the amount of gelatin powder mixed in between 3 parts by weight and 30 parts by weight by 5 parts by weight each, when the ratio of gelatin powder was increased to 3 parts by weight as in Example 3, the film was produced. Although the surface of the film had good gloss and sufficient stiffness, it felt sticky upon contact.

In addition, while the film surface containing 35 parts by weight of gelatin powder has the contact resistance and good texture characteristic of gelatin, it also wrinkles when a strong force is applied to the film surface. For products laminated with this film, the surface was warped and a portion of the underlying fabric surface was sometimes exposed. Therefore, the optimum amount of the gelatin powder is 3 to 30 parts by weight. However, the amount of gelatin powder can be further changed depending on the type of film molding resin, the amount of solvent used, molding conditions, etc.

Furthermore, in the above-mentioned elution of gelatin powder by hot water washing, the higher the temperature of the hot water used, the more gelatin powder it contains can be eluted in a shorter time. There was an inconvenience that the fabric would be damaged. From this, we comprehensively consider the type of fabric the film is laminated with, the material characteristics of the film itself, the amount of gelatin powder contained in the film, the amount of gelatin powder eluted from the film, etc. Then, the gelatin powder contained in the film, membrane or coating is eluted. In addition, in the polyurethane resin film of Example 1, it is ideal to elute the gelatin powder contained in hot water or hot water of 60 to 150'C, and the amount of gelatin powder contained in the film is eluted with hot water of 60 to 150'C. It took less time and more time.

Example 4 Toluene 70 parts by weight Gelatin powder finer than 6 μm 10 parts by weight Polyvinyl chloride resin 30 parts by weight The PVC film produced in Example 4 has increased flexibility and expands and contracts more than ordinary PVC film. Along with the remarkable increase in properties, moisture absorption function was introduced.

Also, depending on the above-mentioned blending amount, a coating material was produced along with the formation of a film and a coating.

Example 5 Toluene 70
Part by weight: 10 parts by weight of gelatin powder, which is finer than a 6μ sheet It had the characteristic that it had no sensitivity, and the gloss of the film surface was also good. Furthermore, when a film was formed with a resin solution having this blending ratio and a coating film was also formed as a paint, the film or coating film was similarly excellent in abrasion resistance and had a moisture absorbing function.

Example 6 Toluene 70 parts by weight Gelatin powder finer than 6 μ■ 10 parts by weight Polyvinyl chloride resin 15 parts by weight Acrylic resin
15 parts by weight The film produced with the blending ratio of Example 6 was the same as that of Example 5.
Although the abrasion resistance tended to be inferior to that of the above film, it felt good to the touch and had good adhesion during lamination. In addition, films formed using a resin solution having this blending ratio and coating films formed using a paint containing this resin solution have good hygroscopicity and contact resistance, and have an appropriate feel to the touch. .

Example 7 Grind gelatin powder in toluene, blend polyester of a two-component reaction type urethane paint into the toluene containing the ground gelatin powder, then add and blend isocyanate and use a spray gun to form a coating film with a thickness of 0.006 mm. I got it.

This coating film had an excellent matte effect and had a good texture when touched with the hand without any sticky feeling. In this example, the amount of gelatin powder was 10 to 40% by weight based on the total weight of polyester and gelatin powder in the two-part reactive urethane resin paint.
A coating film was formed in the range of .

Example 8 A liquid urethane resin solution (non-yellowing - corrugated polyurethane, non-volatile content 30%) was mixed with a mixture of methyl ethyl ketone.
0 to 50 poise (25°C), 50 parts by weight of gelatin powder was mixed with toluene in 100 parts by weight of this urethane resin, and the temperature was adjusted to 100 poise (25°C).
The mixture was stirred and mixed. When this mixture was sprayed onto a PvC board with a spray gun and dried at 100° C. for 1 minute, a coating film with good hygroscopicity and a high matting effect was obtained.

Example 9 A mixed solution obtained by blending a solvent containing 30 parts by weight of gelatin powder in 100 parts by weight of urethane resin was coated on release paper, and after drying, the obtained film with a thickness of 0,00F+nm was coated on a textile base. I transferred it to wood and glued it together. The surface of the fabric produced in this way did not feel sticky (and had an excellent feel.

Example lO Apply a one-component urethane resin containing gelatin powder (30% by weight mixture of gelatin powder and non-volatile content using methyl ethyl ketone as a solvent) onto release paper using a comma roll, dry it,
Furthermore, on top of this coating layer, a two-component urethane resin containing gelatin powder (a mixture of gelatin powder and methyl ethyl ketone as a solvent with a non-volatile content of 50% by weight) is applied.
It was dried to form a laminated film, and this laminated film was peeled off from the release paper and laminated and adhered to the surface of the nonwoven fabric.

The surface of the nonwoven fabric having this laminate film did not have a sticky feeling, and adhesive strength similar to that of laminate adhesion not containing gelatin powder was obtained.

(Effects) In the method for pulverizing gelatin according to the present invention, since the gelatin powders are pulverized while being separated from each other by the solvent, the gelatin powders do not come into direct contact with each other and fuse together.

Further, when the gelatin powder is pulverized, no heat is generated due to grinding or impact pulverization, and there is no problem such as fusion of the gelatin powders or quality deterioration due to thermal changes.

Furthermore, since the gelatin powder is crushed while covered with a solvent, the gelatin powder may dry out during the crushing process.
Since it does not swell, there is no inhibition of hydrophilicity due to gelatin powder drying, and there is no inconvenience that gelatin powder becomes viscous due to swelling and pulverization is inhibited.

These factors made it possible to reliably and efficiently produce gelatin powder with a particle size smaller than 6 μm.

Furthermore, since this fine powdered gelatin is dispersed in a suspension in a solvent, it is said to be smooth and easy to blend with molding resins for films, sheets, membranes, etc., and these resin mixtures. It has the feature that gelatin powder is evenly dispersed inside. Further, the above feature is the same even when gelatin powder pulverized with a solvent is used as a paint component together with the solvent.

Therefore, using a resin mixture or paint containing gelatin powder in a range finer than 6 μm, film,
When a film or coating is formed, these films,
These films are formed with gelatin powder uniformly dispersed in the film or coating. As a result, these films and the like have the characteristics of gelatin-specific moisture absorption and desorption properties, appropriate contact resistance, and elasticity, as well as being prevented from being charged with static electricity.

Furthermore, since the particle size of the gelatin powder contained in these films, sheets, films, or coatings is finer than 6 μl, it has been possible to form these films, sheets, films, or coatings thinly. . In particular, films or coatings with a thickness of 0.006 nm and coatings with a thickness of 0.002+ nm are produced, and in either case, contamination from the surface of the formed film, coating, or coating is produced. The gelatin powder did not stand out or stick out, and the surface was smooth to the touch.

In addition, since the gelatin powder is uniformly exposed on the surface of the film, film, or coating that is formed, hygroscopicity is effectively brought to the surface of the film, film, or coating, resulting in a good texture. It brings a feeling.

Furthermore, when mixed gelatin powder is eluted from the surface of the formed film, membrane or coating.

The surface of these films, coatings, or coatings is provided with countless fine pores of several microns, which gives the surface of the film formed a unique moisture absorbing and desorbing function, especially water-resistant and moisture-permeable function. It has the following characteristics.

Also, when sanding is applied to the surface of the film, film, or coating formed during pick-up.

The absorbency of gelatin powder contained in films etc. is 1!
fl ability, water resistance and moisture permeability, and a good texture are further promoted.

The method of pulverizing gelatin according to the present invention, and the films, coatings, and paints using the gelatin powder obtained by this pulverizing method, are useful as synthetic leather materials for use in various furniture, personal items such as bags, and automobiles. In addition to being used as interior materials, it is also used in various electronic devices and keyboards for their operators due to its non-static properties.

In addition, the films, coatings, and coatings containing gelatin powder mentioned above may be produced or used by the same method or method as the method for forming a film, forming a film, or forming a coating film that does not contain gelatin powder. can do. For this reason, films, membranes and coatings using the ground gelatin powder according to the present invention can be used as a means for molding or surface decoration of all products that are used in daily life.

Claims (1)

[Claims] 1. Gelatin in the form of powder or granules is pulverized by wet pulverization using a solvent such as dimethylformamide or toluene, and the pulverized gelatin powder has a particle size of less than 6 microns. A method for pulverizing gelatin, which is characterized by: 2. Gelatin powder or grains that have been classified and have a particle size of less than 50 microns account for at least 90% by weight of the total weight, and the classified gelatin powder or grains are wet-pulverized using a solvent such as dimethylformamide or toluene as a medium. crushed by
A method for pulverizing gelatin, characterized in that the pulverized gelatin powder has a particle size finer than 6 microns. 3. Powdered or granular gelatin is pulverized by wet pulverization using a solvent such as dimethylformamide or toluene, and this pulverized gelatin powder has a particle size finer than 6 microns, and the gelatin contained in this solvent is 1. A resin film characterized in that pulverized gelatin powder is a part of the resin film composition. 4. Powder or granular gelatin is pulverized by wet pulverization using a solvent such as dimethylformamide or toluene, and this pulverized gelatin powder has a particle size finer than 6 microns, and the gelatin powder contained in the solvent is 1. A resin film, characterized in that pulverized gelatin powder is part of the resin film composition. 5. Powdered or granular gelatin is pulverized by wet pulverization using a solvent such as dimethylformamide or toluene, and this pulverized gelatin powder has a particle size finer than 6 microns, and the gelatin contained in the solvent is A paint characterized by containing crushed gelatin powder as part of the paint component.