JPH04821B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides dusting powder used in the dusting process in the production of rubberized fabrics, particularly rubberized fabrics for clothing.
The present invention relates to a method for manufacturing rubberized fabric using powdered powder having special properties.

[Prior Art] The dusting powder used in the dusting process during the production of rubberized fabric has a great influence on the subsequent operations and the appearance and function of the finished product, and influences the product value, so the selection of dusting powder is important. This is a very important problem for rubberized fabrics, especially rubberized fabrics for clothing.

Conventionally, talc, magnesium carbonate, calcium carbonate, sweet potato starch, wheat starch, cornstarch, zinc stearate, etc., have been used alone or in combination as flour, and these have been selected and used depending on the intended use. For example, zinc stearate is used for rubber-coated fabrics such as air mats and rubber boats where the adhesion process is important in the final product, although it is somewhat expensive, so that it does not dissolve into the rubber during vulcanization and interfere with adhesion.

Commercial value is important for rubberized cloth for clothing, and because of problems such as the slipperiness of sewing machines during sewing processing, powder floating during kneading and bending, and contamination, conventional inorganic powders such as talc, mica, silica, etc. Clay, etc. are not used as they are unsuitable, and are sometimes used in combination to prevent malfunctions such as the flouring machine running out of powder, but starch powders such as wheat starch and potato starch have been used exclusively. .
However, there may be slight differences in the appearance and texture after vulcanization depending on the form of the powder, the amount of adhesion, etc., and even depending on the brand of the same product, but it is still the mainstream at present. . However, in recent years, as rubber-coated cloth for clothing has become more sophisticated, it has come to be treated differently from the so-called rubber waterproof cloth of the past, and sometimes when it is subjected to such operations as clothing, regardless of whether it is washed, laundered, or dry-cleaned. In some cases, body presses, Hoffman presses, or steam irons are used for subsequent finishing.

Starch is a mixture of amylose and amylopectin, and is normally insoluble in water, but if you heat it with water or add boiling water, it gelatinizes and becomes alpha starch. Therefore, if rubber-coated clothing happens to be subjected to the above-mentioned treatment, the starch in the powder will gelatinize, making the rubber surface less slippery, resulting in unexpected drawbacks such as loss of sleeve threadability and poor wearing comfort. It began to arise.

In order to improve this drawback, the present applicant has discovered that a modified starch that is difficult to swell and gelatinize can be obtained by cross-linking the surface of starch powder using epichlorohydrin, formalin, etc. and grafting it. They focused on this and devised the idea of using this modified starch as a dusting powder. Jitsugan Sho 58-82742 (Jitsugan Sho 59-
187443), Utility Application No. 58-82743 (Utility Application No. 1874-18744).

Rubber-coated fabrics for clothing, which are mainly produced by hot air and atmospheric pressure vulcanization, require a large amount of heat due to their system, so from an economical standpoint, low-temperature vulcanization has recently been preferred.

Powder used on unvulcanized rubberized fabric during the production of rubberized fabric is caused by the rubber layer softening when the rubberized fabric is vulcanized and some of the powder on the surface penetrating into the softened rubber layer, resulting in residual powder. However, when low temperature vulcanization is performed, even modified starch, which had previously achieved good results, began to have some drawbacks. This is thought to be related to the morphology of the starch particles themselves. That is, since the starch particles are nearly flat in shape, the degree to which they penetrate into the surface rubber layer during low-temperature vulcanization is small, resulting in a poor balance with the remaining particles. Therefore, even if modified starch particles are used alone, good results cannot be obtained.

[Problems to be Solved by the Invention] In the production of rubberized fabric, the present invention is capable of producing a rubberized fabric, even if the rubberized fabric is vulcanized at a low temperature, compared to conventional rubberized fabric using wheat starch or modified starch as powder. Rubber that is not inferior in terms of slipperiness during sewing or powder floating due to kneading and bending, is comparable in terms of appearance and commercial value, and is not affected by hot water washing, finishing steam ironing, body press, etc. The purpose of the present invention is to provide a method for manufacturing a cloth.

[Means for solving the problems] The present invention involves applying an adhesive to a base fabric, further laminating a compounded rubber layer thereon using a sizing machine (spreader) or a calendar, and finishing with a hot vulcanizer after dusting. The softening point is 90℃ for the dusting powder used in the dusting process for ordinary rubber-coated cloth.
~350°C, plastic fine powder mainly composed of spherical particles with a particle size of 3 μm ~ 40 μm is treated alone or in advance with crosslinking treatment, non-swelling treatment, etc.
Blended with modified starch powder and/or silicic acid powder imparted with gelatinizability, i.e., 50 to 100% by weight of the above plastic fine powder based on the entire powder,
Using powder made by mixing the above-mentioned modified starch powder at a ratio of 50 to 0% by weight and silicic acid powder at a ratio of 50 to 0% to make a total of 100% by weight, after dusting and kneading, heat the powder. Vulcanize with a vulcanizer to produce rubberized cloth.

Example 1 First, a base fabric (for example, 190 nylon plain woven fabric) is coated with an adhesive using a doctor knife using a spreader. The kneaded rubber compound is then rolled in a calender, and this layer is coated (topping) on the adhesive pasted cloth. Immediately after that, fine powder of benzoguanamine resin with a particle size of 10 to 20 μm is applied as powder. Apply “Epostor L” (product name: Nippon Shokubai Chemical Industry Co., Ltd.) using a powdering machine,
Then, after grinding, it is continuously put into a heating vulcanizer.
A rubberized cloth was produced by vulcanization at 140°C for 10 minutes.

Example 2 A rubberized cloth was produced in the same manner as in Example 1, except that the following formulation was used as powder powder: Epostor L 60 Flow Starch (manufactured by Matsutani Chemical Co., Ltd.) 20 Silica powder 20 Total 100 was blended and used.

All of the rubberized fabrics obtained in this way have little discoloration, and the fine plastic powder penetrates into the surface of the rubber layer more appropriately during vulcanization than conventional modified starch, so it has a good balance with residual dusting powder, and there is no slippage during sewing. It is also excellent in terms of the appearance value of the product, such as the ability to loosen powder due to stiffness, massaging, and bending. In addition, the dusting was not affected by hot water washing, finishing steam ironing, etc.

Although silicic acid powder, silica, talc, clay, etc. are not suitable for use alone as dusting powder for rubberized cloth for clothing, they are effective in preventing powder breakage during dusting work, and are effective for dusting rubberized cloth for clothing. They can be used together to the extent that the appearance value of the rubberized fabric is not diminished.

[Effects of the Invention] The rubberized fabric obtained by the manufacturing method of the present invention can be vulcanized at low temperatures, and has better slipperiness during sewing than conventional rubberized fabrics using wheat starch, modified starch, etc. as powder. Also, there is no problem of powder floating due to kneading and bending, and there is no inferiority in terms of appearance and commercial value, and the powder does not gelatinize even when washed in hot water, finished with a steam iron, body press, etc. Therefore, it is an excellent method for producing light-colored rubberized fabrics for clothing.

Claims (1)

[Scope of Claims] 1. Ordinary rubber-coated fabric in which an adhesive is applied to a base fabric, a compounded rubber layer is further laminated thereon using a sizing machine (spreader) or a calendar, and after dusting, it is finished using a heat vulcanizer. The powder used in the dusting process has a softening point of 90°C to 350°C.
℃, plastic fine powder mainly composed of spherical particles with a particle size of 3 μm to 40 μm, or modified starch powder and/or silicic acid that has been subjected to crosslinking treatment or has been given anti-swelling and anti-gelatinization properties. 50 to 100% by weight of the above plastic fine powder, 50 to 0% by weight of the above modified starch powder and 50% by weight of the silicic powder, based on the entire powder.
A method for producing rubberized cloth for clothing, characterized by using dusting powder made by mixing three materials at a ratio of ~0% by weight to 100% by weight. 2 The plastic fine powder is polypropylene,
Claim 1 is a fine powder of polyethylene, vinyl chloride, acrylic resin, ethylene-vinyl acetate copolymer, benzoguanamine resin, resin whose main component is divinylbenzene, epoxy resin, polystyrene, nylon, etc. A method of manufacturing rubberized cloth for clothing.