JPS5937030B2 - How to adhere to oily surfaces - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of adhering seals and the like to oily surfaces.

There are many products with oil-based surfaces, such as coatings on the surface of agricultural products to preserve freshness and other surface protection, storage containers and bags for processed foods such as marcarin and butter, and rust-proof paper for packaging machinery and equipment. It is used.

BACKGROUND ART In the case of agricultural products, such as eggs, attempts are being gradually made to apply vegetable oil or a mixture thereof to the surface of the product to preserve its freshness.

At this time, a sticker is often pasted on the surface of the egg with the name of the producer's organization, the pack's visit to Japan, etc. However, since the surface of the egg is oil-based, even if there is sufficient adhesion between the temporary sticker and the adhesive, Peeling between the adhesive and the oily surface was often observed.

Generally, adhesives used in such cases include:
Additives such as adhesives and fats and oils have been used to impart adhesive strength to natural rubber, synthetic rubber, synthetic resins, etc., but the compatibility between the egg surface, fats and oils, and such adhesives is poor, resulting in so-called It is thought that the sticker could not be stuck due to its low affinity, and as a result, the sticker would peel off immediately from the egg, which has an oily surface. The present invention was invented in view of the above circumstances, and even if the adhesive has the composition described above, it can be applied to oily surfaces of agricultural products such as eggs, oil-based storage containers for processed foods such as marcarin, and butter. It is also an object of the present invention to provide a method for reliably adhering a seal or the like to the surface of an object such as the like. The present invention is a method for bonding to an oily surface using an adhesive made by dissolving stranded rubber, adhesive, and oil in a solvent, in which the oil used in the adhesive is the same as the oil on the oily surface. The above object was achieved by making the solubility parameter of the adhesive almost equal to the solubility parameter of the oil on the oily surface.

In carrying out the present invention, the rubber may be natural rubber or synthetic rubber, the adhesive may be coumaron resin, petroleum hydrocarbon resin, rosin derivative, phenolic resin, terpene resin, etc., and the oil or fat may be rapeseed oil, corn oil, soybean oil,
Vegetable oils such as peanut oil are used as appropriate.

The oil and fat used in the adhesive is the same as the resin applied to the surface of the adherend, so when determining the solubility parameter of the adhesive, consider the relationship between the rubber or plastic and the adhesive. Since it is sufficient to almost match the solubility parameter of the mixture and the solubility parameter of the oil or fat, it is extremely easy to determine the composition of the adhesive.

From the above measurement results, Formulation 1, which has the same solubility parameter as the oily surface of chicken eggs and contains the same oil and fat as the oil applied to the egg surface, had an extremely high degree of adhesion and a high initial tack, and was able to accomplish the purpose of the present invention. However, even if the solubility parameters are the same, the adhesive of the present invention has almost the same solubility value as the oily surface of the adherend, so the adhesive and the oily surface are compatible and have high affinity. If this adhesive is used in a seal or the like, it can be firmly attached to the oily surface of the adherend.

The above formulation was put into a container according to weight and dissolved with toluene to give a concentration of 30 (F6) to obtain an adhesive.

First, this adhesive was applied to the back side of a paper sticker, and the surface was made oily with corn oil (the solubility parameter of the surface was 8.4).

) and peeled off by hand to examine the degree of adhesion. On the other hand, the first
As shown in the figure, an elevation angle 43' where adhesives 3 of compositions 1 to 4 are applied between positions 2 along the upper part 5011 from the lower end 1.
and two types of steel balls, namely diameter 11m & weight 5.
．． 49 steel balls (this is called steel ball A).

) and a steel ball (this will be referred to as steel ball B) with a diameter of 7 m and a weight of 1.49 cm and whose surface was coated with corn oil was prepared. As shown in Fig. 2, when the steel ball A6 is rolled down the slope to which the adhesive 3 is not applied, if the starting point 7-1 is close to the position 2, the adhesive 3 will cause it to move to a position close to 2 between 1 and 2. However, as shown in Fig. 3, as the starting point 7-2 of the steel ball A6 moves upward, the falling steel ball A6 comes to stop at a position between 1 and 2, and finally, As shown in FIG. 4, it comes to stop at the lowest end between 1 and 2, that is, above 1.

In this example, the distance X between the starting point 7-3 and position 2 of the steel ball A6 at this time was defined as the initial adhesiveness. Steel ball B (
(not shown) was also examined for initial adhesion in the same manner as steel ball A.

All the above results are shown in the table below.

[Brief explanation of drawings]

Figures 1 and 4 are side views for explaining the method for measuring the initial tackiness of an oil-based surface adhesive in this example. 2 indicates a position along the 50-degree upward direction from the lower end 1, 4 indicates the elevation angle of the inclined surface 5, and 6 indicates the starting point from which the steel ball A6 starts rolling.

Claims (1)

[Claims] 1. In a method of adhering to an oily surface using an adhesive made by dissolving masticated rubber, adhesive, or oil in a solvent, the oil used in the adhesive is the same as the oil on the oily surface, and the adhesive A method for adhering to an oily surface, characterized in that the solubility parameter of the oil and the solubility parameter of the oil and fat on the oily surface are substantially matched.