WO2018135527A1 - Structure which has oil film in surface - Google Patents

Abstract

This structure is characterized by comprising a substrate 1 and an oil film 3 that is formed on the surface of the substrate, and is also characterized in that the oil film 3 is formed of a homogeneous gel of an oil-based liquid.

Description

Structure with oil film on the surface

The present invention relates to a structure having an oil film formed on the surface, and particularly to a structure suitably used as a container.

容器 Containers that contain fluid contents are required to discharge the contents regardless of the material of the container. In the case of containing a low viscosity liquid such as water, such discharge is hardly a problem. For example, in the case of a viscous material such as mayonnaise or ketchup, it may be a plastic container but glass. Whether it is a made container, this discharge is a serious problem. That is, such contents are not quickly discharged even when the container is tilted, and adhere to the container wall, and therefore cannot be used up to the end. The contents remain without being discharged.

Recently, various techniques for improving slipperiness with respect to viscous substances by forming an oil film on the surface of a molded body such as a container have been proposed (for example, Patent Documents 1 and 2).
According to such a technique, as compared with the case where an additive such as a lubricant is added to the synthetic resin that forms the surface of the molded body, the slipperiness can be drastically improved.

However, in the means for modifying the surface properties by forming an oil film on the surface of the base as described above, the effective life of the slipperiness exhibited by the oil film is short, and the slipperiness decreases after a long period of time. In some cases, however, problems such as the contents sticking to the surface have occurred. This tendency is particularly noticeable when the material that slides down the surface is an emulsion, particularly a mayonnaise-like food with low oil content.

For example, the present applicant has previously described a packaging container containing an oil-in-water emulsion typified by mayonnaise-like food, and an oil film is formed on the inner surface of the container in contact with the oil-in-water emulsion. A packaging container is proposed (Patent Document 3).
In addition, the present applicant has also disclosed a packaging material characterized in that a liquid film is formed on the inner surface in contact with the contents, and solid particles having a particle diameter of 300 μm or less are dispersed in the liquid film. (Patent Documents 4 to 6).
However, even in these techniques previously proposed by the present applicant, the problem of a decrease in slipperiness over time has not been effectively solved.

In addition, the present applicant has also proposed a structure in which a liquid film is formed by an oily gel-like coating as a structure in which slippage due to liquid film is improved over time as described above (patent) Reference 7).
A structure in which such a coating of an oily gel is formed is required to have a structure in which the decrease in slipperiness over time is considerably improved, but the decrease in deterioration over time is further improved. Furthermore, in such a structure, when the substrate on which the gel coating is based has transparency such as glass, there is a problem that the transparency is impaired by the gel coating, and further improvement is required. Yes.

WO2012 / 100099 WO2013 / 022467 Japanese Patent Application Laid-Open No. 2015-151131 WO2015 / 194251 WO2015 / 194625 WO2015 / 194626 Patent No. 6001726

Therefore, the object of the present invention is that the structure in which the gel coating for improving the slipperiness with respect to the viscous water-containing material is formed, and the effect of improving the slipperiness is further sustained and stably exhibited. The object is to provide a structure in which the transparency of the gel-like coating is also improved.

The inventors of the present invention conducted many experiments on the slipperiness with respect to viscous substances, and as a result, when a gel-like coating was formed on the surface using a gelling agent compatible with an oily liquid, As a result, it was found that the sustainability of slipperiness was further improved and the transparency of the gel-like coating was improved as compared with the case where gel-like particles were used as a gelling agent, and the present invention was completed. .

According to the present invention, there is provided a structure having a base material and an oil film formed on the surface thereof, wherein the oil film is formed by a homogeneous gel of an oily liquid. .

In the structure of the present invention,
(1) The gel contains a gelling agent that is compatible with the oily liquid,
(2) the gelling agent is 12-hydroxystearic acid,
(3) The gel oil film is formed on the surface of the substrate in an amount of 0.1 to 100 g / m ² ;
(4) The oily liquid is an edible oil;
(5) the substrate has transparency;
(6) The base material is glass;
Is preferred.

Since the oil film is provided on the surface of the structure of the present invention by an oily liquid gel (oily gel), various viscous water-containing materials such as jam, ketchup, mayonnaise, honey, various dressings, etc. Excellent slipperiness for viscous water-containing substances having a viscosity at 100 ° C. of 100 mPa · s or more.

Although it is the same as the structure disclosed in Patent Document 7 described above in that it exhibits excellent slipperiness with respect to the above viscous substance, in the present invention, the oily gel is homogeneous. Therefore, the sustainability of the above slipping property is further improved. That is, in the structure of the present invention, the fact that the oily gel forming the oil film is homogeneous means that a substance compatible with the oily liquid is used as the gelling agent. This means that solid particles are not used as a gelling agent. In short, in the present invention, a gel is formed by forming a network by hydrogen bonding in a state where the gelling agent itself is compatible with the oily liquid, and holding the oily liquid by such a network.
Since the oil film formed of such a homogeneous oily gel has no granular material distributed therein, it does not cause the gel to collapse due to separation or aggregation of the granular material, and also has high adhesion to the substrate surface. In addition, it is more difficult to deform. For example, an oily gel obtained by using a solid granular material as a gelling agent can be measured for viscosity by a rotational viscometer, but a homogeneous oily gel formed using a gelling agent that is compatible with an oily liquid is rotated. It is close to a solid so that the viscosity cannot be measured with a viscometer. Therefore, the oil film by the oily gel in the present invention is not discharged together with the moving viscous substance even when the viscous water-containing substance moves on the oil film, and is stably held on the substrate surface. The slipperiness will be maintained stably over a longer period.

Further, in the present invention, the fact that the oily gel forming the oil film is homogeneous and does not contain solid particulate matter means that it is excellent in transparency. That is, when solid particles are dispersed in an oil film, the oil film becomes clouded due to light scattering, multiple reflection, etc., but in an oil film formed of a homogeneous oily gel, such light This is because scattering and multiple reflection do not occur.
Thus, in the structure of the present invention, since the transparency of the oil film is high, even when the base material is transparent like glass, the transparency is maintained, for example, viscous The present invention can also be applied to a glass container in which a hydrous substance is accommodated, which is a great advantage of the present invention.
The structure of the present invention exhibits excellent slipperiness with respect to viscous water-containing substances, and also has excellent sustainability, such water-containing substances, mayonnaise, ketchup, honey, jam, etc. It is particularly suitably used as a container for storing viscous contents having a viscosity (25 ° C.) of 100 mPa · s or more.

The schematic sectional side view for demonstrating the surface form of the structure of this invention.

Referring to FIG. 1, the structure of the present invention comprises a base material 1 molded into a shape according to the application and an oil film 3 formed on the surface thereof.

<Substrate 1>
The material of the substrate 1 is not particularly limited as long as the oil film 3 can be held on the surface thereof, and has a form according to the application by any material such as resin, glass, metal, etc. It only has to be.
In particular, from the viewpoint that the structure of the present invention exhibits excellent slipperiness with respect to a viscous water-containing substance due to the oil film 3, the substrate 1 is a member that comes into contact with such a water-containing substance, for example, viscous It is preferable to use a container for containing a water-containing substance, a lid used for the container, a pipe for flowing a water-containing substance, and the like. In particular, not only a direct blow bottle that is suitably used for squeezing out viscous contents, but also a polyester container and a glass container excellent in transparency such as polyethylene terephthalate are suitable in consideration of the characteristics of the oil film 3 described later. . Of course, a synthetic resin container or the like may have a multilayer structure.

<Oil film 3>
In the present invention, the oil film 3 provided on the surface of the substrate 1 as described above is formed by a homogeneous gel (oil-based gel) of an oil-based liquid.

The oily liquid used for the formation of the oily gel exhibits slipperiness with respect to the water-containing substance and functions as a lubricant.
Such an oily liquid must naturally be a non-volatile liquid having a low vapor pressure under atmospheric pressure, for example, a high boiling point liquid having a boiling point of 200 ° C. or higher under atmospheric pressure. This is because when a volatile liquid is used, it easily evaporates and disappears with time, and it becomes difficult to form the oil film 3.

In addition, it is a liquid having a high boiling point as described above, exhibits high wettability with respect to the surface of the base material 1, and can form an oily gel that adheres uniformly on the surface. It is preferable that the contact angle at 20 ° C. is 45 ° or less and the viscosity at 25 ° C. is 100 mPa · s or less. That is, even if the surface material of the substrate 1 is made of synthetic resin, glass or metal, the oil film 3 made of an oily gel may be formed using an oily liquid that satisfies the above physical properties.

Furthermore, among the oily liquids satisfying the physical properties as described above, the lubricating effect is higher as the surface tension is significantly different from the material to be slidable (for example, the container contents in a container). Is suitable.
That is, it is preferable to use an oily liquid having a surface tension in the range of 10 to 40 mN / m, particularly 16 to 35 mN / m in terms of improving the slipperiness with respect to the viscous water-containing substance. Typical examples include liquid paraffin, synthetic paraffin, fluorinated liquid, fluorinated surfactant, silicone oil, fatty acid triglyceride, and various vegetable oils. In particular, when the substance to be slidable is a food (for example, mayonnaise or ketchup), edible oil or fatty acid triglyceride is preferable.
Specific examples of such edible oils include soybean oil, rapeseed oil, olive oil, rice oil, corn oil, ben flower oil, sesame oil, palm oil, castor oil, avocado oil, coconut oil, almond oil, walnut oil, and bean oil. And salad oil.

In the present invention, the gel made of the oily liquid contains a substance compatible with the oily liquid (hereinafter referred to as an oil-soluble gelling agent) as a gelling agent. Such an oil-soluble gelling agent itself forms a hydrogen bond or a coordinate bond, and forms a network in the oily liquid. As such an oil-soluble gelling agent, a compound having a functional group capable of forming a hydrogen bond (for example, a hydroxyl group or a carboxyl group), a polyvalent ion capable of forming a coordination bond (for example, aluminum, zinc, or And metal salts having magnesium).
Specifically, 12-hydroxystearic acid, dibenzylidene sorbitol, calcium dehydroabietic acid, amino acid derivative, alkyl phosphate, cholesterol derivative, phenolic ring oligomer, anthracene derivative, triphenylamine derivative, quaternary ammonium salt derivative And vitamin H derivatives, cholic acid derivatives butyrolactone derivatives, urea derivatives, sugar fatty acid esters, alkyl fluorides, modified silicones, metal soaps, and waxes.
The amino acid derivatives include, but are not limited to, dibutyllauroylglutamide and dibutylethylhexanoylglutamide; modified silicones as side chain alkyl-modified silicones; metal soaps such as stearic acid and isostearic acid. Fatty acid metal salts composed of polyvalent ions such as aluminum and zinc; waxes include hydrocarbons such as linear paraffin and polyethylene, higher alcohols such as cetanol and stearyl alcohol, and fatty acids such as stearic acid Typical examples are hydrogenated castor oil and hydrogenated jojoba oil.
In the present invention, among the above gelling agents, 12-hydroxystearic acid is most preferable.

Such a gelling agent is used in an amount less than or equal to the solubility in an oily liquid, but generally in an amount of 0.1 to 50 parts by weight, particularly 1 to 10 parts by weight per 100 parts by weight of the oily liquid. used.

The formation of the oil film 3 using the mixed liquid of the oily liquid and the oil-soluble gelling agent may be performed by any appropriate means such as bar coating, gravure coating, spray coating, spin coating, dip coating, etc., depending on the form of the substrate. However, it is usually carried out by spraying. If spray spraying is used, the oil film 3 can be easily formed regardless of whether the surface of the substrate 1 is a flat surface such as a film or a three-dimensional shape such as the inner surface of a container.

The oil film 3 made of the homogeneous oily gel formed in this way is preferably formed on the surface of the substrate 1 in an amount of 0.1 to 100 g / m ² . That is, if this amount is too small, the slipperiness and sustainability of the oil film 3 will be unsatisfactory, and even if it is formed more than necessary, no more slipperiness or sustainability will be obtained, which will only increase the cost. is there.

Further, since the oil film 3 is very difficult to deform as compared with an oil film made of a heterogeneous oily gel obtained by using fine solid particles as a gelling agent, the oil film 3 is firmly held on the surface of the base material 1. Even when a viscous substance flows on the surface 3, it is possible to effectively avoid the inconvenience of falling off with the viscous substance, and the slipperiness with respect to the viscous water-containing substance is more sustained and stable. The
Furthermore, since the oil film 3 is homogeneous and does not contain particles that cause light scattering and multiple reflection, it is excellent in transparency.

The structure of the present invention described above exhibits excellent slipperiness and persistence for viscous water-containing substances. Accordingly, the present invention particularly relates to a viscous water-containing material having a viscosity at 25 ° C. of 100 mPa · s or more, such as mayonnaise, ketchup, aqueous glue, honey, various sauces, mustard, dressing, jam, chocolate syrup, and emulsion. It is suitably applied to containers such as bottles and pouches that contain cosmetic liquids such as liquid detergents, shampoos and rinses.
Moreover, since the oil film formed on the surface of the structure exhibits high transparency, the present invention can be suitably applied to a glass container.

The present invention will be described in the following experimental examples.
Prepare medium chain fatty acid triglyceride (MCT) as an oily liquid, mix 12-hydroxystearic acid (oil-soluble gelling agent) in an amount of 4 parts by mass per 100 parts by mass of MCT, and stir with a homogenizer. As a result of spraying, gelation occurred in several tens of seconds after spraying, and an oil film of a homogeneous oily gel was formed.
This oil film showed high transparency.
When a jam was applied to the surface of the glass plate on which the oil film was formed, and the glass plate was tilted, the jam slipped off at an inclination angle of 5 degrees, and no jam remained on the glass plate surface. Furthermore, after performing this experiment, 24 hours later, the jam was applied again, and the glass plate was tilted in the same manner. As in the first time, the jam quickly slipped down, and no jam remained on the glass plate surface. It was.
For comparison, a jam was applied to the surface of the glass plate on which no oil film was formed, and when the glass plate was tilted, the jam did not fall easily, and when the glass plate was stood vertically, the jam fell, but the glass A small amount of jam remained on the plate.

1: Base material 3: Oil film

Claims (7)

1. A structure having a base material and an oil film formed on the surface thereof, wherein the oil film is formed of a homogeneous gel of an oily liquid.
2. The structure according to claim 1, wherein the gel contains a gelling agent that is compatible with the oily liquid.
3. The structure according to claim 2, wherein the gelling agent is 12-hydroxystearic acid.
4. The structure according to claim 1, wherein the oil film of the gel is formed on the substrate surface in an amount of 0.1 to 100 g / m ² .
5. The structure according to claim 1, wherein the oily liquid is edible oil.
6. The structure according to claim 1, wherein the substrate has transparency.
7. The structure according to claim 6, wherein the base material is glass.

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