JP3457017B2 - belt - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt such as a power transmission belt or a conveyor belt, and more particularly to an improvement in a rubber component which is a composite with a rubber-coated canvas layer. . 2. Description of the Related Art Generally, in a transmission belt such as a wrapped type in which a canvas is joined to the surface of a belt body, a finishing rubber is rubbed into the canvas by means such as friction. However, in the case of a power transmission belt having a canvas layer to which such a finishing rubber is applied, when the belt is stored in a warehouse or the like for several years after production, mold occurs on the surface of the canvas layer, and the commercial value of the belt is reduced. May significantly reduce or cause hygiene problems. [0003] Accordingly, a fungicide is blended in a finishing rubber which is rubbed into a canvas to form the canvas layer, and the fungicide imparts mold resistance to the belt so that the belt can be stored for a long period of time. It has been practiced to prevent mold on the surface. [0004] Conventionally, as the fungicide for imparting the mold resistance, a fungicide containing arsenic-based 10-10-oxybisphenoxyarsine as a main component or a phosphorus-based S-benzyl thiophosphate There are -O, O-diisopropyl and tolclofosmethyl, but as a result of the inventor's experimental evaluation using these, it has been found that they cannot be used industrially in terms of performance, safety, cost and the like. [0005] By the way, a fungicide for a belt of this type is required to satisfy the following conditions satisfactorily. (1) The main component and mixture of the fungicide are not harmful or toxic to the human body. (2) The mold prevention period is long over several years. (3) It is thermally stable and does not decompose below 200 ° C. (4) It is easily dispersed in rubber and does not impair the physical properties and adhesiveness of rubber. (5) No adverse effect on rubber processing (kneading, rolling, friction, extrusion, vulcanization). (6) There should be no contamination on marks or color objects (no blooming). (7) No effect on product performance. (8) Easy handling. (9) Supply stability. (10) Inexpensive. However, it has been difficult for all of the above-mentioned conventional devices to satisfy all of the above conditions. Therefore, at present, it is desired to realize an alternative to the conventional one. The present invention has been made in view of the above-mentioned points, and an object of the present invention is to find a fungicide for a belt which can satisfy all of the above-mentioned conditions in a satisfactory manner, and to form a belt for a power transmission belt, a conveyance belt, or the like. The purpose is to prevent the occurrence of mold. [0008] In order to achieve the above object, the present inventor has conducted intensive studies on the selection of various substances satisfying the above-mentioned requirements, and has studied various kinds of fungicides used as fungicides. The fungicide is evaluated by the mold resistance test method specified in JIS / Z2911, and the workability and product quality of these substances are examined on a laboratory scale. The following mixture has been found to be optimal: That is, according to the first aspect of the present invention, a belt provided with a canvas layer rubbed with a finishing rubber on the surface of the belt main body includes thiabendazole and 2 in the finishing rubber rubbed into the canvas layer. , 4,5,6 tetrochlorophthalonitrile, 2-n-octyl-4-isothiazolin-3-one, 2-methoxycarbonylaminobenzimidazole, zinc-2-pyridinethiol-1
1-oxide or a mixture with 4,5-dichlorooctylisothiazolin-3-one, 2,4,5,6 tetrochlorophthalonitrile, 2-n-octyl-4-isothiazolin-3-one or 2-methoxy A mixture with carbonylaminobenzimidazole, 2-n-octyl-4-isothiazolin-3-one, 2-methoxycarbonylaminobenzimidazole, zinc-2
-Pyridinethiol-1-1 oxide or 4.5
A mixture with -dichlorooctylisothiazolin-3-one, a mixture of diiodomethyltolylsulfone and 2-methoxycarbonylaminobenzimidazole, 2-methoxycarbonylaminobenzimidazole and zinc-2-pyridinethiol-1-1 A mixture with oxide or 4,5-dichlorooctylisothiazolin-3-one, or zinc-2-pyridinethiol-1-one
A fungicide consisting of one of a mixture of 1-oxide and 4,5-dichlorooctylisothiazolin-3-one is blended, and the mixing ratio of one of the components constituting each mixture is 25% to 75%. % der is, further the canvas
10 PHR or less in the finishing rubber rubbed into the layer
The compounding amount of silicic acid filler is compounded with fungicide.
It is characterized in that that. [0010] [0011] [act] In a first aspect of the present invention, the finishing rubber in canvas layer of the belt, thiabendazole, 2, 4, 5, 6
Tetrochlorophthalonitrile, 2-n-octyl-4-
Isothiazolin-3-one, diiodomethyltolylsulfone, 2-methoxycarbonylaminobenzimidazole, zinc-2-pyridinethiol-1-1 oxide or 4,5-dichlorooctylisothiazoline-3-
A fungicide consisting of a mixture containing two of the ON components is blended, and these fungicides satisfy the above-mentioned plurality of conditions well, so that a fungicide suitable for a belt is obtained. The generation of mold can be stably prevented over a long period of time. One of the components constituting each of the above mixtures
By setting the mixing ratio of the vulcanized rubber to 25% to 75% ,
The releasability from the vulcanizing mold can be improved. [0013] Further, since the amount of the silicic acid-based filler compounded together with the fungicide in the finishing rubber rubbed into the canvas layer is 10 PHR or less, the silicic acid-based filler during the compounding of the finishing rubber is not used. In addition to restricting the compounding of fillers, the compounding of carbon black was increased to prevent excessive shirting due to the addition of fungicides during kneading of the above-mentioned finishing rubber, thereby preventing insufficient vulcanization. In addition to preventing the adhesion of rubber, the effect can be adjusted when a tackifier is compounded during the compounding of the finishing rubber. Therefore, vulcanization of the rubber is properly performed and no sticking occurs, so that the releasability between the vulcanized rubber and the vulcanizing mold can be improved. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a wrapped V-belt B as a power transmission belt according to an embodiment of the present invention, wherein 1 is a belt main body having a trapezoidal cross section, and chloroprene rubber (neoprene);
The belt B is formed of a known rubber compound suitable for the intended use of the belt B, such as styrene butadiene rubber, hydrogenated acrylonitrile butadiene rubber, or the like. This belt body 1
, Cords 2, 2,... (Core wires) as endless reinforcing members are embedded in parallel at a constant pitch in the width direction of the belt B and spirally with respect to the belt length direction. Have been. The surface of the belt body 1 is covered with a canvas layer 3. The canvas layer 3 is formed by covering the surface of the belt body 1 with a canvas layer material, molding and vulcanizing.
The canvas layer 3 is covered on the bottom surface of the belt body 1 so as to form an overlap portion 3a. As the material of the canvas layer 3, a yarn or blended yarn composed of cotton, Tetron (registered trademark), nylon (registered trademark) or the like is used alone or in combination, and the abrasion resistance and the coefficient of friction required for the belt canvas are used. Woven to fill. A friction rubber is rubbed into the canvas layer 3 as a finishing rubber, and a fungicide is mixed in the friction rubber. As a feature of the present invention, the above-mentioned fungicide, which is a mixture of two substances selected from the following seven substances and mixed at a predetermined weight ratio (25% to 75%) , is used. Have been. Thiabendazole (hereinafter abbreviated as TBZ in this example) 2,4,5,6 tetrachlorophthalonitrile (T
2-n-octyl-4-isothiazolin-3-one (abbreviated as M-8) diiodomethyltolylsulfone (abbreviated as A-48) 2-methoxycarbonylaminobenzimidazole (abbreviated as A-48) Zinc-2-pyridinethiol-1-1 oxide (abbreviated as ZnO) 4,5-dichlorooctylisothiazoline-3-o
In other words, the fungicide composed of the mixture is TPN + TBZ,
TPN + M-8, BCM + TPN, BCM + A-48,
M-8 + BCM, M-8 + TBZ, M-8 + ZnO, M
-8 + RH, BCM + ZnO, BCM + TBZ, BCM
+ RH, TBZ + ZnO, TBZ + RH, ZnO + RH
And the above-mentioned 14 as a main component. When a silicic acid-based filler is used together with a fungicide in the friction rubber rubbed into the canvas layer 3, the amount is preferably 10 PHR or less. Therefore, in this embodiment, TBZ, TPN, M-8, A-48, BCM, ZnO are contained in the friction rubber in the canvas layer 3 of the wrapped V belt B.
Or a fungicide consisting of a mixture of two RHs in a predetermined weight ratio is blended, and while these fungicides satisfy various conditions required for transmission belts, for example, they are not harmful. Because it has mold resistance,
The generation of mold on the wrapped V-belt B can be stably prevented over a long period of time. When a silica-based filler is added to the friction rubber applied to the canvas layer 3 together with the fungicide, the amount is preferably 10 PHR or less. And the physical properties of the rubber can be adjusted, and the releasability of the vulcanized belt B from the mold can be improved by the interaction between the silicic acid-based filler and the fungicide. This will be described in more detail. In the above-mentioned friction rubber compounding design, when a fungicide and a silicic acid-based filler are used, and the other components are compounded in the same manner as before, when vulcanizing the friction rubber,
Mold and stickiness occur. In the step of covering the belt body 1 with the canvas layer 3 rubbed with the friction rubber according to the above-described blending design, and then vulcanizing the same integrally with the canvas layer 3, In some cases, part of the resin may be removed, and the workability in the vulcanization process is extremely poor, and the productivity is reduced by about 20%. Further, as a vulcanization method for the wrapped V-belt B, a ring-shaped mold 5 as shown in FIG. There is a ring vulcanization method for simultaneously vulcanizing each of a plurality of V belts B, B,. However, in this ring vulcanization method, when the friction rubber having the above-described blending design is used, the ring-shaped mold 5 and each belt B after vulcanization are used.
And the releasability between the belt B and the belt B
There is a concern that the device may be damaged when it is removed from the mold, or a heavy load may be imposed on the operator. Therefore, in view of such a case, carbon black is mainly used as a filler, and the use of a silica-based filler containing a silica component which is liable to cause seizure by heat is restricted as much as possible. In addition, it is possible to improve the surface activity between the vulcanized rubber and the mold, thereby improving the releasability of the vulcanized rubber and the mold. Next, a specific example will be described. As shown in Table 1, the rubber composition composed of natural rubber, butadiene rubber, and styrene-butadiene rubber, and the compounding materials having only six different mixing ratios of only carbon black and a silicic acid-based filler. A fungicide composed of a mixture of M-8 + ZnO is blended and designed so as to have a predetermined amount (2.5 PHR), and the friction rubber is kneaded. The friction rubber is used as a raw material for forming a canvas layer of a wrapped V-belt. The fabric was rubbed on both sides to obtain a fabric for a canvas layer. Next, after slitting this canvas for fabric layer in a bias shape,
The bias cloth is joined to form a long bias-like canvas layer material, and the canvas layer material is coated on the surface of the belt body, molded, and subjected to a vulcanization step to obtain the wrapped V belt according to the present invention (Examples 1 to 4 of the present invention). 4 and Comparative Examples 1 and 2) were produced. In addition, as a conventional example, a product having a blended design containing arsenic-based 10-10-oxybisphenoxyarsine as a main component was manufactured. Then, first, each of these V belts is
It was cut into a length of mm to prepare a sample for evaluating mold resistance. Each sample and a blank sample containing no fungicide were individually placed on a JIS inorganic agar medium in a Petri dish, and 1 ml of the following mixed spore suspension of the following mold was uniformly sprinkled over the sample. After that, the cells were cultured at 25 ° C. for 28 days. Aspergillus niger
ger) Penicillium citrinum (Chaetomium globosum) Aureobasidium Pullance
ulans) Gliocladium Virens (Paecilomyces SP) Each sample is continuously cultured on a medium in a petri dish with the above-mentioned mixed spores of the mold, and the occurrence of mold is visually observed. Then, the mold resistance of each sample was evaluated. As a result, in the blank sample in which the fungicide was not blended, a slight mold was observed at the end of the sample after 7 days, and a slight mold was observed on the surface of the sample after 14 days. After 28 days, vigorous mold development was observed on the sample surface. On the other hand, in the samples of Examples 1 to 4 of the present invention and Comparative Examples 1 and 2 in which the fungicide composed of a mixture of M-8 + ZnO was blended, the fungicidal activity of the sample was maintained even after 28 days. No occurrence was observed, and it was confirmed that the above-mentioned fungicide imparted excellent mold resistance to the rubber composition.
Such mold resistance is equivalent to a mold-preventing ability that can prevent the occurrence of mold as occurs in storage in a general warehouse for 10 years. Further, Examples 1 to 4 of the present invention and Comparative Examples 1 and 2 were used.
And about the conventional example, the releasability and adhesiveness from the vulcanized mold and the V belt (vulcanized rubber) after vulcanization were tested. In the evaluation of the releasability shown in Table 1, those that easily demold are indicated by ○, those that are slightly difficult to demold are indicated by Δ, and those that are extremely difficult to demold are indicated by x. The adhesion test was conducted under the conditions of press vulcanization at 148 ° C. for 25 minutes and then peeling in the 180 ° direction at a pulling speed of 50 mm / min, showing the adhesive force per 25 mm width at that time. [Table 1] Table 2 shows the physical properties of each of the samples tested according to JIS / K6301. [Table 2] When the fungicide consisting of the mixture of M-8 + ZnO is blended in an amount of 2.5 PHR, the mixing ratio of the two components M-8 and ZnO is set to the same weight ratio (50% each). Table 3 shows the releasability from the mold and the mold resistance when changed. Further, Table 4 shows the mold releasability from the mold, the vulcanization rate and the mold resistance when the mixing ratio of the fungicide comprising the mixture of M-8 + ZnO was changed. In the evaluation of the vulcanization rate shown in Table 4, those having a high vulcanization rate and good workability are indicated by ○, and those having a low vulcanization rate and having a problem in workability are indicated by x. [Table 3] [Table 4] In Examples 1 to 4 and Comparative Examples 1 and 2 shown in Table 1 above, only the fungicide was prepared from a mixture of M-8 + ZnO using BCM + ZnO, TBZ + ZnO, ZnO + RH.
Table 5 shows the releasability and mold resistance when each mixture was replaced with the other components (the other components were the same as in Table 1). The mixing ratio of these fungicides is 2.5 PHR. [Table 5] Further, the blending design of Example 3 of the present invention (see Table 1)
In Table 6, the mold releasability and fungicidal properties when only the fungicide was changed from the mixture of M-8 + ZnO to each of the combinations other than Table 5 above are shown. [Table 6] Apart from the above test, the wrapped V-belt manufactured as a sample as described above was run, and the dusting state and the running life were compared with the conventional example. In the test in the powder-drop state, a standard V-belt of size A-35 was manufactured by covering the surface of a belt body in which a polyester cord was embedded with a canvas layer made of cotton plain-woven canvas. When the belt is run at a predetermined speed with a pair of 80 mm A-type pulleys wound around a pair of A-type pulleys, and one pulley is urged in a direction away from the other pulley with a dead weight of 40 kg, the belt runs from the side of the belt after four hours The rate at which rubber powder was removed was evaluated. Table 7 shows the results. In the running life test, a V-belt similar to the above was manufactured, and this V-belt was wound around a pair of A-type pulleys having an outer diameter of 80 mm, and one pulley was 70 kg from the other pulley. The belt was run while being rotated at 2.2 PS while being urged away, and the time to the life of the belt at that time was evaluated. Table 8 shows the results. [Table 7] [Table 8] Further, the mark written on the belt surface was tested for contamination. That is, the fungicide is TPN +
For each of the standard belts of M-8 and ZnO + M-8, the color transfer status of the white mark was 500.
Visual inspection was performed for each of the 100 pieces, and no transfer of the mark was found for any of the pieces. Further, each of the standard belts using the other fungicides according to the above-mentioned examples was visually inspected for the same transfer dyeing condition for each 1000 belts, but no transfer dyeing occurred. According to the test results, TBZ, TPN, M-8, A-48, BCM, and BCM were used as fungicides incorporated in the friction rubber rubbed on the canvas layer of the belt.
It can be seen that the use of the 14 types of mixture containing ZnO and RH as the main components maintains the mold resistance of the friction rubber, thereby improving the mold prevention of the transmission belt. According to the results shown in Table 1, Table 5 and Table 6, when the above-mentioned fungicide is blended and used, the amount of the silicic acid filler is limited to 10 PHR or less. By increasing the compounding amount of carbon black instead of reducing the amount, it is possible to reliably prevent the change in the properties of the friction rubber due to the compounding of the fungicide in the present invention, and to improve the releasability of the belt from the mold. It turns out that it can be secured. In the above embodiment, the wrapped V belt B
However, the present invention can be applied to any belt in which the canvas layer is vulcanized and joined to a part of the belt body. As described above, according to the first aspect of the present invention, thiabendazole, thiabendazole, etc. are contained in the finishing rubber for forming the canvas layer in belts such as power transmission belts and transport belts.
2,4,5,6 tetrochlorophthalonitrile, 2-n-
Octyl-4-isothiazolin-3-one, diiodomethyltolylsulfone, 2-methoxycarbonylaminobenzimidazole, zinc-2-pyridinethiol-
A fungicide consisting of a mixture containing two of 1-1 oxide and 4,5-dichlorooctylisothiazolin-3-one is blended, and one of the components constituting each mixture is mixed at a rate of 25% to 25%. 75% and finish
Compounding ratio of silicic acid filler compounded in rubber
By setting it to HR or less, it is possible to satisfactorily satisfy a plurality of conditions required as a fungicide for belts with these fungicides, and to improve the releasability between the vulcanized rubber and the vulcanizing mold. Thus, it is possible to stably prevent the occurrence of mold on the belt for a long period of time. In addition, compounded with the above finishing rubber
Of 10% or less of the silica filler
Finish which may be caused by the formulation of the above fungicide
To effectively prevent the change of rubber properties,
Mold releasability and mold resistance
Stable production of belts can be achieved. [0050]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a wrapped V-belt in an embodiment according to the present invention. FIG. 2 is a sectional view of a main part of a ring-shaped mold applied to the embodiment of the present invention. [Description of Signs] B Wrapped V-belt (belt) 1 Belt main body 3 Canvas layer 3a Overlap portion 5 Mold

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Katsuyoshi Fujiwara 3-2-1-15 Meiwadori, Hyogo-ku, Kobe City, Hyogo Prefecture Inside Bando Kagaku Co., Ltd. (56) References JP-A-2-108685 (JP, A) JP-A-3-251508 (JP, A) JP-A-55-109658 (JP, A) JP-A-63-291982 (JP, A) JP-A-55-59907 (JP, A) JP-A-61-118303 (JP, A) JP, A) JP-A-63-196502 (JP, A) JP-A-62-81742 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16G 1/00-9/04 A01N 1/00-65/02 B29D 29/00-29/10

Claims (1)

(57) [Claim 1] A belt provided with a canvas layer rubbed with a finishing rubber on the surface of a belt body, wherein the finishing rubber rubbed into the canvas layer includes: Thiabendazole, 2,4,5,6 tetrochlorophthalonitrile, 2-n-octyl-4-isothiazoline-
3-one, 2-methoxycarbonylaminobenzimidazole, zinc-2-pyridinethiol-1-1 oxide or a mixture with 4,5-dichlorooctylisothiazolin-3-one, 2,4,5,6 tetrochlorophthalo Nitrile and 2-n
-Octyl-4-isothiazolin-3-one or 2
A mixture with -methoxycarbonylaminobenzimidazole, 2-n-octyl-4-isothiazolin-3-one,
2-methoxycarbonylaminobenzimidazole,
A mixture of zinc 2-pyridinethiol-1-1 oxide or 4,5-dichlorooctylisothiazolin-3-one, a mixture of diiodomethyltolylsulfone and 2-methoxycarbonylaminobenzimidazole, 2-methoxycarbonyl Aminobenzimidazole, zinc-2-pyridinethiol-1-1 oxide or 4,5-dichlorooctylisothiazoline-3
Or a mixture of zinc-2-pyridinethiol-1-1 oxide and a mixture of 4,5-dichlorooctylisothiazolin-3-one, and a fungicide, One of the components constituting each mixture has a mixing ratio of 25%
Was 75%, the finishing of rubbers rubbed into the canvas layer, 10 pH
Silicate-based filler with a compounding amount of R or less is compounded together with a fungicide
A belt characterized by being made .