JPH08291226A - Production of non-slip sheet made of polymer - Google Patents

Abstract

PURPOSE: To obtain a non-slip sheet made of a polymer and suitable as the sole of a shoe with a simplified process dispensing with a slicing process for getting a formed product having a large area by forming a sheet of a kneaded mixture composed mainly of a polymer, a rigid fiber and a foaming agent and hot-pressing the sheet in a mold. CONSTITUTION: A kneaded mixture composed mainly of a polymer such as natural rubber, a rigid fiber such as glass fiber or carbon fiber and a foaming agent such as sodium bicarbonate is formed in the form of a sheet and hot- pressed in a mold to effect the fluidization of the polymer and the decomposition of the foaming agent to move the rigid fiber and obtain the objective non-slip polymer sheet containing the rigid fiber randomly oriented in three-dimensional state. The weight ratio of the polymer to the rigid fiber is preferably 100/(40-20).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a polymeric anti-slip sheet suitable for shoe soles in extremely cold regions, shoe soles for indoor shoes, cushioning materials for furniture furniture and the like.

[0002]

2. Description of the Related Art An anti-slip sheet made of a polymer material, that is, rubber or plastic mixed with glass fibers exhibits anti-slip properties when the glass fibers are in contact with the contact surface at right angles. Such anti-slip sheet, the glass fiber is added to the rubber or plastic by a kneading operation, dispersed, rolled, cut so that the glass fiber can contact the contact surface at a right angle, to make a large number of such cutting sheets, The glass fibers are assembled so that they meet in the same direction, and the assembled sheets are integrated by heating, pressurizing, vulcanizing, and molding, and then the glass fibers are cut to the cut surface. It is sliced so that it is exposed at a right angle.

[0003]

However, in the conventional method for producing a polymeric anti-slip sheet as described above, in order to keep the glass fibers in contact with the contact surface perpendicularly, the rolled sheet is slit and layered. Since it was manufactured by assembling and vulcanizing in a large number of sheets, it not only takes a lot of time and labor to assemble a number of layers, but a large area can not be practically manufactured, and slicing etc. I also needed
The polymer itself is soft and softened by frictional heat and the like, and it adheres to the blade and is difficult to cut. On the other hand, the mixed glass fibers are hard, and the blade is worn out. It is an object of the present invention to provide a method for producing a polymeric anti-slip sheet that does not have the above-mentioned drawbacks.

[0004]

The present invention is made of a polymer obtained by sheeting a kneaded product containing a polymer, a hard fiber and a foaming agent as main components, placing the kneaded product in a mold, and heating and pressing. It is characterized by the manufacturing method of anti-slip sheet. In carrying out the present invention, as the polymer, a rubber polymer such as natural rubber or synthetic rubber, or a thermoplastic polymer such as ethylene-vinyl acetate copolymer may be used alone or in combination.

The polymer and the hard fiber are kneaded so that the weight ratio is 100: 40 to 120. Within this range, the workability is good and the anti-slip property is sufficiently maintained even on ice in severe cold regions, on hard snow, and indoors. Here, if the glass fiber is less than 40 parts by weight, the slip resistance is not sufficiently imparted, and if it exceeds 120 parts by weight, it becomes too hard and the workability deteriorates, and the elasticity is insufficient, so that the wearing comfort is reduced. Deteriorate.

Glass fibers and carbon fibers are used as the hard fibers, and have a diameter of 8 to 25 microns and a length of 3 to 30 m.
m, preferably 3 to 5 mm is used. As the foaming agent, sodium bicarbonate, ammonium carbonate, nitroso compound, azo compound, sulfonyl hydrazide, etc. are used, and the mixing amount thereof is 10 parts by weight to the polymer.
It is 0: 2-7.

Kneading of polymer and hard fiber is 45 to 50 ° C.
This is an open roll, and is performed under the condition that the roll interval is 1.5 to 3.5 mm. Molding is 130-140 by press mold
° C., clamping pressure 80~120kg / cm ^2, is carried out under the conditions of tightening time 6-10 minutes. The specific gravity of the product is 0.4-1.
It is 0 g / cm ² , but 0.7 to 0.8 is most preferable for shoe soles. The sheet thus obtained has appropriate elasticity and excellent slip resistance, so that
It is also preferably used on the lower surface of furniture.

[0008]

In the manufacturing process of the present invention, the hard fibers are oriented in the polymer only in the rolling direction in the finishing rolling process, that is, the sheeting process, but this polymer is still thermoplastic and foams. Since it contains the agent, the foaming phenomenon is started by heating in the mold, and as a result, bubbles are generated, and accordingly, the orientation of the hard fibers is disturbed, so to speak, non-blending.

Therefore, the considerable portion of the hard fiber is in a vertical state even with respect to the contact surface, and the cut surface which appears when the bubbles of the polymer as the base material remove the film on the surface, It becomes concave or crater-like and easily deforms, in other words, it easily fits in the ground contact surface, and in combination with such a phenomenon, an excellent anti-slip effect can be exhibited.

[0010]

【Example】

[Table 1]

According to Table 1, a roll machine having a roll temperature of 45 to 50 ° C. was used, kneading was performed with a roll gap of 2.0 mm, and sheeting was performed. This was placed in a mold so that the volume of the mold was 1/2, and foaming and vulcanization were performed under the conditions of a press temperature of 140 ° C., a pressure of 100 kg / cm ² , and a time of 7 minutes. At this time, the specific gravity was 0.5 cm ³ . When it is used as a shoe sole, it is usually optimal to set it at 0.7 to 0.8 kg / cm ³ .

One of the molded products thus obtained is a plate-shaped product having a smooth surface and a diameter of 28 mm, and a molded product having a diameter of 28 mm provided on the entire surface so as to have a wavy shape. The solid polychloroprene rubber having a diameter of 28 mm and the natural rubber sponge having a specific gravity of 0.5 g / cm ³ and a diameter of 28 mm were designated as Comparative Examples 1 and 2, respectively.

Each of these samples was placed on a polyvinyl chloride tile and an ice surface, a weight of 200 g was placed thereon, and the sample was pulled from one direction,
The pulling force at the beginning of sliding is F, and the weight of the weight is 20
The anti-slip property was compared by the value of F / W with 0 g as W. It is shown in Table 2.

[0014]

[Table 2]

[0015]

[Effects] The present invention does not require a slicing step for obtaining a molded product having a large area, and since only one heating step is required, the steps can be simplified, and the simplified steps are free. The size was able to be molded.

Claims (4)

[Claims] 1. A process for producing a polymeric anti-slip sheet, which comprises sheeting a kneaded product containing a polymer, hard fibers and a foaming agent as main components, placing the kneaded product in a mold, and applying heat and pressure. 2. A method for producing a polymeric anti-slip sheet, characterized in that the weight ratio of the polymeric material to the hard fibers is 100: 40 to 120. 3. When the sheeted sheet is heated and pressed in a mold, the polymer is fluidized and the foaming agent is decomposed to cause displacement of the hard fibers, and the three-dimensionally randomly. 3. The method for producing a polymeric anti-slip sheet according to claim 1, wherein the anti-slip sheet is arranged. 4. The method for producing a polymeric anti-slip sheet according to claim 1, wherein the hard fibers are glass fibers or carbon fibers.