JP2520274B2 - How to make shoes or boots - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing shoes or boots having a rubber product made of acrylonitrile rubber as a component.

Conventional technology and its problems The dyeing technology has been developed mainly for dyeing fibers, and recently, for example, dyeing processing of polyurethane synthetic leather has also been performed.

However, the rubber is not dyed. Some rubber products also have what is called dyed and processed, but these products are rubbers that have been stained and stained with dyes, and are not true dyed products. -Washing fastness according to L 0844
It is only about the first grade. This is because rubber has NH ₂ , CO, OH
It is also because the technique for dyeing fibers cannot be applied as it is because there is no polar group such as.

Therefore, conventionally, coloring of rubber products such as shoes and boots has been carried out by blending a pigment into the rubber compound during kneading of rubber. In a colored rubber product prepared by blending this pigment, a clear tint cannot be obtained, it is difficult to obtain the desired color due to color variation of the raw rubber and discoloration after vulcanization, etc. It has the drawback of being easy.

Further, since the raw rubber is mixed with a pigment to be colored to form a part, and the parts are assembled and molded, shoes or boots of the same color are manufactured in units of hundreds to thousands of pairs. Therefore, it is impossible to manufacture a small number of shoes of various colors according to the taste of the customer.

Means for Solving the Problems The present inventor has conducted various studies in view of the problems of the above techniques, and as a result, vulcanized acrylonitrile-based rubber is easily obtained in the presence of a specific surfactant. The present invention was found to be dyed, and the present invention was finally completed.

That is, the present invention provides a method for manufacturing shoes or boots, which comprises dyeing a molded shoe or boot using a vulcanized rubber part made of acrylonitrile rubber with a disperse dye in the presence of a surfactant. To do.

In the present invention, only acrylonitrile rubber,
It shows excellent dyeability, and other rubbers are not substantially dyed.

In the present invention, the acrylonitrile rubber means not only acrylonitrile rubber (nitrile-butadiene rubber: NBR) itself, but also NBR natural rubber, styrene-butadiene rubber (SBR), isoprene rubber (IR), chloroprene rubber (CR), butadiene It includes a blend of at least one of general-purpose rubbers such as rubber (BR) and ethylene / propylene / diene / terpolymer (EPDM). The NBR preferably has a bound acrylonitrile content of about 26 to 40%. When NBR is used in combination with other general-purpose rubber, it is desirable that the former is 25 parts by weight or more, more preferably 75 parts by weight or more, in 100 parts by weight of the mixture. NBR
If the content of is too small, the dyeability of the rubber product will decrease. Such rubber should be blended with known additives such as sulfur, mercaptobenzothiazole, dibenzothiazole sulfide, tetramethylthiuram sulfide, diethylene glycol, zinc white, stearic acid, white carbon, light calcium carbonate, and antioxidant. Can be done.

The disperse dye used in the present invention is not particularly limited, but specifically, Disperse Fast Yellow, Disperse F
ast Brown, Disperse Fast Orange, Disperse Fast Rub
ine, Disperse Red, Disperse Blue, Disperse Green,
Known disperse dyes such as Disperse Diazo Black and Disperse Direct Black are exemplified.

The surfactant used in the present invention includes polyoxyethylene alkyl ether, sodium alkylaryl sulfonate, sodium higher alcohol sulfate ester, and sodium stearate, among those used as a cleaning agent after usual fiber dyeing. Specific examples include ester sodium salt, sodium linear alkylbenzene sulfonate, and dodecyldiethylenetriamine.

The method of the present invention is usually carried out as follows. First, the dye concentration is about 0.01 to 10 g / l, more preferably 0.03 to 2
After preparing a dyeing bath having a concentration of about g / l and a surfactant concentration of about 2 to 10 g / l, more preferably 3 to 4 g / l, shoes or boots containing NBR vulcanized rubber parts as its constituent members. Soak,
Stain. The dyeing conditions vary depending on the type of disperse dye used, the size of the product, the desired fastness to selection, the form of the rubber product, etc., but are usually maintained at a temperature of about 60 to 90 ° C. for about 10 to 30 minutes. For example, in the case of dyeing processing of acrylonitrile fiber, the dyeing bath temperature is 0.03 to 10 g / l, 40 to 60 at about 80 to 100 ° C.
In the case of post-dyeing processing of the cloth shoes having the vulcanized rubber component according to the present invention as a constituent member, it is necessary to maintain the temperature of 80 ° C. for the shape retention of the entire cloth shoes as a product. About 20
It is about a minute. According to the present invention, by appropriately adjusting the dye concentration, the product amount for the dyeing bath, the dyeing conditions, etc.
The amount of dye applied to 100 cm ² of rubber product surface area can be adjusted in the range of about 0.03 g (light color) to about 2 g (dark color).

Effects of the Invention According to the present invention, the following remarkable effects are achieved.

(1) NBR type vulcanized rubber products can be easily dyed.

(2) The dyed vulcanized rubber product has a clear color tone.

(3) The dyed vulcanized rubber product has excellent fastness.

(4) Since it is possible to carry out post-dyeing processing in the form of molded shoes or boots, it is possible to dye in units of several pairs or even pairs of pairs. Therefore, it is possible to provide a unique shoe at a low price in accordance with the customer's favorite color. Conventionally, a raw rubber is mixed with a pigment to be colored and then assembled and molded, so that a shoe or a boot of the same color is manufactured in a unit of hundreds to thousands of pairs.

(5) Also, shoe soles, tapes, which have been previously dyed in any color,
Since it can be molded by combining a toe guard, a heel guard, etc., it is possible to manufacture a variety of unique shoes and boots that meet diverse customer requirements. According to the method of the present invention, it is possible to manufacture custom-made shoes or boots in which the color of each rubber portion is different.

Examples The following examples are given to further clarify the features of the present invention.

Example 1 After each rubber compound having the composition shown in Table 1 was masticated and kneaded, the mixture was held at a temperature of 130 ° C. and an air pressure of 3 kg / cm ² for 60 minutes to be vulcanized and 3 cm × 7 cm × 2 mm sample Nos. 1 to 6 were obtained.

Details of each rubber used are as follows.

NBR: Trademark "JSR-N230SL", manufactured by Japan Synthetic Rubber Co., Ltd., content of bound acrylonitrile 35% SBR: Trademark "Sorprene 1205", manufactured by Asahi Kasei Corporation IR: Trademark "Klaprene IR-10", Kuraray Isoprene Chemical Liquid IR: Trademark "Kuraprene LIR-30", Kuraray Isoprene Chemical Co., Ltd. 0.3 g of the following disperse dyes and polyoxyethylene alkyl ether (trademark "Monogen", P & G Co., Ltd.) in 500 cc of water
1.5 cc) was added, the temperature was raised to 50 ° C., the above sample Nos. 1 to 6 were immersed therein, the temperature was raised to 80 ° C. over 10 minutes, and the same temperature was maintained for 20 minutes. It was dyed. After the completion of dyeing, the sample was washed with water, soaped (immersed in the same 3 g / l solution of polyoxyethylene alkyl ether as described above at 50 ° C. for 3 minutes), and further washed with water.

Disperse dye {all manufactured by Sumitomo Chemical Co., Ltd.}: A; Sumikaron E-RPD Blue B; Sumikaron E-RPD Red C; Sumikaron E-RPD Yellow Appearance of the obtained dyed sample and fastness test according to JIS L-0844 The results are shown in Table 2.

As is clear from the results shown in Table 2, Sample 1 containing no NBR was not dyed with any dye, while Samples 2 to 6 containing NBR were dyed. It is also clear that the higher the NBR content, the higher the dyeing density.

Example 2 A material obtained by laminating a front cloth made of a nylon cloth and a back cloth made of a cotton cloth was used as a covering material, and an unvulcanized compound similar to that of Sample 1 of Example 1 was used as a rubber bottom. An unvulcanized compound similar to that of Sample 6 was used as a tape rubber, bonded and molded with an adhesive, and then vulcanized by holding at a temperature of 130 ° C and an air pressure of 3 kg / cm ² for 60 minutes to form a pair of rubber shoes. Got

To 20 liters of water at 50 ° C., 20 g of the same disperse dye A, B or C as used in Example 1 and 60 cc of polyoxyethylene alkyl ether were added to prepare three kinds of dye baths.

The rubber cloth shoes obtained above were respectively immersed in this dyeing bath, and the temperature was raised to 80 ° C over 10 minutes with stirring, and the temperature was kept at the same temperature for 20 minutes. It was washed with water, soaped (immersed in the same 3 g / l solution of polyoxyethylene alkyl ether as above at 50 ° C. for 2 minutes), further washed with water, dehydrated and dried.

The rubber covering material and the tape rubber of the obtained rubber shoes were deeply dyed in their respective predetermined colors.

In addition, the washfastness of the obtained rubber cloth shoes according to JIS-L 0844 was grade 4.

Example 3 Using the rubber compound used in Example 1, a total rubber boot for children was prepared and post-dyed.

As the bottom of the boot, the black bottom obtained from the rubber compound used for carbon black was used instead of titanium white in the compounding of sample 1 of Example 1.

The boot torso and anterior and posterior parts were obtained using the formulation of Sample 6 of Example 1.

These unvulcanized rubber parts are laminated and molded at a temperature of 130
Vulcanization was carried out by holding for 60 minutes at a temperature of 3 ° C. and an air pressure of 3 kg / cm ² to obtain one pair of all rubber boots.

The boots thus obtained were post-dyed into three colors in the same manner as in Example 2.

The color of the black bottom of the obtained product was the same as that at the beginning, and the body and the front and back limbs were two-color boots in which dark blue, deep yellow and red were dyed respectively.

Claims (1)

(57) [Claims] 1. A method for producing shoes or boots, which comprises dyeing a molded shoe or boot using a vulcanized rubber part made of acrylonitrile rubber with a disperse dye in the presence of a surfactant.