JP6357075B2 - Manufacturing method of rubber products - Google Patents

Description

  The present invention relates to a method for producing a rubber product, and more particularly to a method for producing a rubber product that can prevent adhesion between rubber molded bodies and can efficiently produce a rubber product having desired physical characteristics.

  Generally, a rubber product is obtained by kneading a rubber composition in which various additives such as a crosslinking agent are blended with a rubber material (raw rubber) as a base component, and kneaded the rubber composition (rubber composition after the kneading process). Is molded into a desired shape such as a sheet or tube (preliminary molding process), and the resulting unvulcanized rubber molded body is further vulcanized (vulcanized molding process). Unnecessary parts are removed from the body to finish the molded body (finishing process), and thereafter, washing, drying, etc. are performed, and the final product is obtained through an inspection process, a packaging process, and the like.

  If a rubber molded product that has undergone a vulcanization molding process tends to adhere during the manufacturing process of such a rubber product, the handleability of the rubber molded product (product) in the subsequent inspection process and packaging process of the rubber molded product (product) will be reduced. Therefore, it is preferable that the rubber molded body (that is, the vulcanized rubber molded body) that has undergone the vulcanization molding process is less likely to adhere (that is, has adhesion resistance). For example, in Patent Document 1, low molecular weight polyethylene glycol and optionally microcristan wax as an anti-tacking agent capable of preventing adhesion (adhesion) of vulcanized rubber is 10 to 30% by weight based on the total amount thereof. An anti-adhesive agent emulsified in an oil-in-water type with 20 to 40% by weight of a nonionic surfactant and 80 to 120% by weight of a long-chain fatty acid salt has been proposed. However, this anti-blocking agent needs to be used at a high concentration in order to exert a sufficient anti-adhesion effect. Therefore, if the anti-blocking agent is added to vulcanized rubber, There is a problem of deteriorating physical properties.

JP-A-60-203649

  The present invention has been made in view of the above circumstances, and the problem to be solved is a physical property of a rubber molded body when manufacturing a rubber product comprising a vulcanized rubber molded body from a rubber composition. It is an object of the present invention to provide a method for producing a rubber product, which can prevent adhesion between rubber molded bodies without causing a decrease in the above, and can efficiently produce a desired rubber product.

  In addition, when producing a rubber product composed of a vulcanized rubber molded body from a rubber composition, it is possible to prevent adhesion between the rubber molded bodies without lowering the physical properties of the rubber molded body. An object of the present invention is to provide a method for producing a rubber product, which can efficiently produce a rubber product imparted with friction.

  As a result of diligent research to solve the above-mentioned problems, the present inventors have developed a treatment liquid containing chlorinated isocyanuric acid, a tertiary alcohol solvent, an ester solvent and / or a ketone solvent as a rubber. By attaching to the surface of the molded body (vulcanized rubber molded body), the rubber molded body can be provided with excellent adhesion, and the physical properties of the rubber molded body surface-treated with the treatment liquid are the treatment liquid. It was found that the physical properties of the rubber molded body before being surface-treated are hardly changed. The present invention has been completed based on such findings, and the features thereof are as follows.

[1] After the rubber molded body production step for producing a vulcanized rubber molded body from the rubber composition, (A) chlorinated isocyanuric acid, (B) a tertiary alcohol solvent, (C) an ester solvent, and / or Alternatively, a method for producing a rubber product comprising a vulcanized rubber molded product, comprising a surface treatment step of attaching a treatment liquid containing a ketone solvent to the surface of the rubber molded product.
[2] After the rubber molded body manufacturing process, a finishing process for removing unnecessary parts from the vulcanized rubber molded body obtained through the rubber molded body manufacturing process, and an inspection for inspecting the appearance of the vulcanized rubber molded body after the finishing process Including a process, or in addition to the finishing process and the inspection process, further including a packaging process of packaging the vulcanized rubber molded body that has undergone the inspection process,
The surface treatment step is performed in (i) a period after the rubber molded body preparation step and before the finishing step, and / or (ii) after the finishing step and before the inspection step, according to [1] above. Rubber product manufacturing method.
[3] Before the inspection process, the cleaning process and the drying process are further included. When the finishing process is performed and the surface treatment process is performed before the inspection process, the cleaning process and the drying process are performed after the surface treatment process. The method according to [2] above.
[4] The method according to any one of [1] to [3], wherein (A) the chlorinated isocyanuric acid is trichloroisocyanuric acid.
[5] The method according to any one of [1] to [4] above, wherein the (B) tertiary alcohol solvent is tert-amyl alcohol and / or tert-heptyl alcohol.
[6] The blending ratio of (B) tertiary alcohol solvent to (C) ester solvent and / or ketone solvent ((B) :( C)) is 5: 5 to 8: 2 by weight. The method according to any one of [1] to [5] above.
[7] The method for producing a rubber product according to any one of the above [1] to [6], wherein the content of (A) chlorinated isocyanuric acid is 1 to 10% by weight based on the entire treatment liquid.
[8] The rubber composition is nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), isoprene rubber (IR), butadiene rubber (BR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), [1] to [7], wherein an additive is blended with one or more rubbers selected from the group consisting of butyl rubber (IIR), natural rubber (NR), and ethylene-propylene-diene rubber (EPDM). The method as described in any one of.
[9] The method according to any one of the above [1] to [7], wherein the rubber composition is a nitroyl rubber composition in which an additive is mixed with nitroyl rubber.
[10] The method according to any one of [1] to [9], wherein the rubber product is a sealing material.

  According to the present invention, when producing a rubber product comprising a vulcanized rubber molding from a rubber composition, it is possible to prevent adhesion between the rubber moldings without deteriorating the working environment, and to achieve the desired physical properties. A rubber product having properties (physical properties) can be efficiently produced. Further, in addition to preventing adhesion between rubber molded bodies, it is possible to impart low friction to the rubber molded bodies. For example, from a nitrile rubber composition containing a nitrile rubber having a high coefficient of friction against metal to a metal. On the other hand, it is possible to obtain a rubber product (vulcanized rubber molding) exhibiting low friction. Therefore, this invention is especially suitable for manufacture of the sealing material for sliding parts which consists of a nitrile rubber composition.

  Further, according to the present invention, when the rubber product is manufactured from a rubber composition containing a component that easily causes precipitation (bloom, bleed, etc.), the rubber that does not cause precipitation immediately after the vulcanization molding step. After the molded body (vulcanized rubber molded body) is subjected to surface treatment with a treatment liquid containing chlorinated isocyanuric acid, a tertiary alcohol solvent, an ester solvent and / or a ketone solvent, Precipitation, that is, finishing process, inspection process and packaging process, and precipitation (bloom, bleed, etc.) from rubber products during storage and transportation after the packaging process can be prevented. Can be manufactured.

Hereinafter, the present invention will be described with reference to preferred embodiments thereof.
The method for producing a rubber product of the present invention (hereinafter also abbreviated as “the method of the present invention”) comprises a step (A) of chlorinated isocyanuric acid after the rubber molded body production step of producing a vulcanized rubber molded body from a rubber composition, The main feature is that it has a surface treatment step of applying a treatment liquid containing (B) a tertiary alcohol solvent and (C) an ester solvent and / or a ketone solvent to the surface of the rubber molded body.

  Similar to conventional rubber product manufacturing methods, the rubber molded body preparation step for preparing a vulcanized rubber molded body from the rubber composition in the method of the present invention involves pre-molding the kneaded rubber composition and further vulcanizing the rubber composition. A mode of molding (that is, a mode comprising a preforming step of preforming a kneaded rubber composition and a vulcanization molding step of vulcanizing a rubber molded body obtained through the preforming step), or The kneaded rubber composition is injection molded to obtain a vulcanized rubber molded body.

  In addition, after the rubber molded body manufacturing process, basically, the appearance inspection of the vulcanized rubber molded body that has undergone the finishing process and finishing process to remove unnecessary portions of the vulcanized rubber molded body obtained in the rubber molded body manufacturing process is performed. Includes inspection process. In addition, the vulcanized rubber molded product that has undergone the finishing process is washed and dried in order to remove rubber scraps generated in the finishing process, to improve the appearance of the rubber product, to stabilize the surface properties, etc. After performing the drying process), the inspection process may be performed. In many cases, the vulcanized rubber molded product (rubber product) that has been made a good product through the inspection process is stored and distributed after shipment. In order to protect the product in the process, the packaging material may be counted (that is, after a predetermined number is counted) and then packaged (that is, having a packaging process).

  In the present specification, “vulcanization” in “unvulcanized”, “vulcanized molding”, “vulcanized rubber” and the like refers to the polymer molecule of rubber using sulfur or sulfur and a vulcanization accelerator. Not only does it chemically combine to make it three-dimensional, but it means not only the three-dimensional state, but also uses a cross-linking agent other than sulfur, such as an organic peroxide, to chemically modify the rubber polymer molecules. To be three-dimensionally combined with or the three-dimensional state.

Hereinafter, the rubber composition and each step in the method of the present invention will be described in detail.
In the present invention, the rubber composition refers to a rubber material as a base component, a crosslinking agent, a crosslinking accelerator, a scorch inhibitor, an anti-aging agent, a filler, a plasticizer, a crosslinking aid, a processing aid, a process oil, It is a composition in which one or more additives selected from flame retardants and the like are blended, and these additives are put into a kneader together with a rubber material.

  The rubber material is not particularly limited. For example, nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), isoprene rubber (IR), butadiene rubber (BR), styrene-butadiene rubber (SBR), chloroprene rubber ( CR), butyl rubber (IIR), natural rubber (NR), ethylene-propylene-diene rubber (EPDM) and the like. One or more rubber materials can be used.

  The cross-linking agent is a material added to chemically bond rubber polymer molecules into a three-dimensional structure, and sulfur or organic peroxide is preferably used. Examples of the organic peroxide include di-t-butyl peroxide, dicumyl peroxide, t-butylcumyl peroxide, 1,1-di (t-butylperoxy) -3,3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3,1,3-di (t -Butylperoxyisopropyl) benzene, 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, t-butylperoxybenzoate, t-butylperoxyisopropyl carbonate, n-butyl-4,4-di Examples thereof include (t-butylperoxy) valerate. One or more crosslinking agents can be used.

  Examples of the crosslinking accelerator include thiuram vulcanization accelerators, sulfenamide vulcanization accelerators, thiazole vulcanization accelerators, dithiocarbamate vulcanization accelerators, and the like. Examples of the scorch inhibitor include N-cyclohexylthiophthalimide, N-nitrodiphenylamine, phthalic anhydride, N-phenyl-N- (trichloromethylthio) benzenesulfonamide, and the like. Examples of the anti-aging agent include amine-based anti-aging agents, phenol-based anti-aging agents, and imidazole-based anti-aging agents. Examples of the filler include carbon black, calcium carbonate, silica, barium sulfate, titanium oxide, magnesium hydroxide, aluminum hydroxide, talc, clay, graphite, calcium silicate, and the like. Examples of the plasticizer include phthalic acid plasticizers such as dioctyl phthalate (DOP), adipic acid plasticizers such as dioctyl adipate, sebacic acid plasticizers such as dioctyl sebacate, and tri- (2-ethylhexyl) trimellitate. Examples thereof include trimellitic acid plasticizers such as polyethers, and polymerization plasticizers such as polyethers and polyesters. Examples of the crosslinking aid include triallyl cyanurate, triallyl isocyanurate, N, N′-m-phenylenebismaleimide, trimethylolpropane trimethacrylate, triallyl trimellitate, 1,2-polybutadiene and the like. Multifunctional compounds are exemplified. Examples of processing aids include stearic acid, palmitic acid, paraffin wax, and the like. Examples of the process oil include aromatic process oil, naphthene process oil, paraffin process oil, and the like. Examples of the flame retardant include hydrated metal oxides such as aluminum hydroxide and magnesium hydroxide, and bromine compounds such as decabromodiphenylethane. Each additive other than these crosslinking agents can be used alone or in combination of two or more as in the case of the crosslinking agent.

The compounding amount of various additives in the rubber composition is appropriately adjusted according to a conventional method according to the use of rubber products to be manufactured, required characteristics, and the like.
For example, when manufacturing a sealing material using nitrile rubber as a rubber material, the following composition is illustrated as a typical composition of a rubber composition.

(Composition Example 1)
Nitrile rubber: 100 parts by weight Crosslinking agent (typically sulfur): 0.1 to 3 parts by weight Filler (typically carbon black): 20 to 150 parts by weight Crosslinking accelerator: 2 to 6.5 parts by weight Processing aid: 0.1-5 parts by weight Plasticizer: 3-20 parts by weight Anti-aging agent: 0.5-5 parts by weight

  Moreover, when manufacturing a sealing material using EPDM for a rubber material, the following compositions are illustrated as a typical composition of a rubber composition.

(Composition example 2)
EPDM: 100 parts by weight Zinc oxide: 3-7 parts by weight Stearic acid: 0.3-1.5 parts by weight Carbon black: 50-120 parts by weight Naphthenic oil: 30-80 parts by weight Vulcanization accelerator: 0.7 -2.4 parts by weight Sulfur: 0.1-3 parts by weight

  The rubber composition is kneaded using a known kneader (for example, an open roll, an intermix, a kneader, a Banbury mixer, etc.), a twin-screw kneading extruder, or the like. The kneading temperature, kneading conditions, and the like are appropriately set according to conventional methods according to the use, required characteristics, etc. of the rubber product to be manufactured.

  In the preforming step, the kneaded rubber composition is preformed into a shape close to a rubber product to be manufactured (vulcanized rubber molded body) or a shape that is easy to mold. For the pre-molding, devices such as an extruder, an open roll, and a pre-former that are widely used in a pre-molding process in manufacturing a conventional rubber product are preferably used. The shape and size of the unvulcanized rubber molded body obtained by preforming are appropriately selected in consideration of the shape and size of the rubber product (vulcanized rubber molded body) to be manufactured. In addition, when obtaining a vulcanized rubber molded body by injection molding, a preforming process is unnecessary by finishing in a ribbon shape at the time of kneading in advance. After the kneading process, the vulcanization molding is performed without passing through the preforming process. A process is performed.

  In the vulcanization molding step, for example, using an injection molding machine, a compression molding machine, a hot press molding machine, or the like, heat molding is performed at a predetermined temperature to obtain a vulcanized rubber molded body. The heating temperature and heating time are appropriately set according to the rubber material, the shape of the rubber product to be manufactured, etc., but are generally selected within the range of 130 to 200 ° C. and 1 to 120 minutes. Specifically, for example, when the rubber composition is a nitrile rubber composition, suitable temperature conditions include a mode of heating at about 150 to 200 ° C. for about 2 to 30 minutes.

  The vulcanized rubber molded body obtained through the vulcanization molding process usually has unnecessary parts such as burrs, and therefore, a finishing process for removing unnecessary parts such as burrs is performed. The finishing process is usually performed by an apparatus or a human hand using a punching machine, a hand-knot, or the like.

  In the cleaning process performed after the finishing process, tap water or industrial ion exchange water is usually sprayed or poured on the surface of the rubber molded body as a cleaning liquid, or tap water or industrial ion exchange water is used. The rubber molded body is dipped in a cleaning tank filled with. By the washing process, the vulcanized rubber molded body that has undergone the finishing process is transferred to a packing operation. In addition, it is suitable to use ion-exchange water as the cleaning liquid from the viewpoint of suppressing the adhesion of impurities to the rubber molded body surface. As the ion-exchange water, for example, the conductivity at 25 ° C. is 5 to 25 MΩ. · Cm, preferably 10 to 20 MΩ · cm is preferably used. The temperature of the cleaning liquid may be normal temperature or higher than normal temperature, and considering the subsequent drying step, it is in the range of 20 ° C. or higher and 80 ° C. or lower (preferably 50 ° C. or higher and 80 ° C. or lower). It is preferable that the temperature is high.

  The drying step is a step of drying the rubber molded body that has undergone the cleaning process, and usually the rubber molded body is naturally dried in the air. In addition, in order to accelerate | stimulate drying, you may dry by blowing a hot air of about 50-100 degreeC, for example.

  The inspection step is a step of inspecting the appearance of the rubber molded body by visual inspection, a magnifying glass, an image analysis device, or the like to make a final rubber product, and inspecting the surface of the rubber molded body for scratches. In this inspection process, good products and defective products are selected.

  The packaging process is a process in which a rubber molded body that has undergone the inspection process is packaged with a packaging material in order to store the rubber product or protect the rubber product in the transportation process after shipment. In such a packaging process, a plurality of rubber moldings are randomly packed in a packaging bag. Here, “packaging” means “industrial packaging” for the purpose of transportation.

  In the method of the present invention, as described above, (A) chlorinated isocyanuric acid, (B) a tertiary alcohol solvent, (C) after the rubber molded body manufacturing step of manufacturing a vulcanized rubber molded body from the rubber composition. ) A surface treatment step is performed in which a treatment liquid containing an ester solvent and / or a ketone solvent (hereinafter also referred to as “treatment liquid of the present invention”) is attached to the surface of the rubber molded body. Usually, the surface treatment step is performed in (i) a period after the rubber molded body preparation step and before the finishing step and / or (ii) after the finishing step and before the inspection step. In addition, when a surface treatment process is implemented in the period before a (ii) finishing process and before an inspection process, a washing | cleaning process and a drying process are normally performed after a surface treatment process and before an inspection process. In the surface treatment step with the treatment liquid of the present invention, as described later, after the treatment liquid of the present invention is applied to the rubber molded body, usually, washing and drying with water or alcohol are performed, Cleaning and drying in the surface treatment step with the treatment liquid of the present invention can be omitted.

  The treatment liquid of the present invention hardly adheres to the inside of the rubber molded body, acts on the surface of the rubber molded body, and prevents the physical properties of the rubber molded body from deteriorating, thereby preventing adhesion of the rubber molded body surface. Give.

(A) Chlorinated isocyanuric acid In the treatment liquid of the present invention, “chlorinated isocyanuric acid” is a concept that includes a salt of chlorinated isocyanuric acid, for example, trichloroisocyanuric acid, dichloroisocyanuric acid, sodium dichloroisocyanurate and The hydrate, potassium dichloroisocyanurate, calcium dichloroisocyanurate, magnesium dichloroisocyanurate and the like can be mentioned. Among these, trichloroisocyanuric acid is preferable from the viewpoint of excellent effect of imparting adhesion to the surface of the rubber molded body. 1 type (s) or 2 or more types can be used for chlorinated isocyanuric acid.

  The content of chlorinated isocyanuric acid in the treatment liquid is preferably 1 to 10% by weight, more preferably 2 to 5% by weight, based on the whole treatment liquid. If the amount is more than 10% by weight, the physical properties (particularly extensibility) of the rubber molded body tend to be lowered, and if it is less than 1% by weight, it tends to be difficult to give sufficient adhesion to the surface of the rubber molded body. .

(B) The tertiary alcohol solvent “tertiary alcohol solvent” is a third alcohol having about 5 to 10 carbon atoms from the viewpoint of making the treatment liquid a treatment liquid that achieves the desired effect by room temperature treatment. A secondary alcohol solvent is preferable, and examples thereof include tert-amyl alcohol and tert-heptyl alcohol, and tert-amyl alcohol is preferable. One or more tertiary alcohol solvents can be used.

(C) The ester solvent in the ester solvent and / or ketone solvent “ester solvent and / or ketone solvent” includes, for example, ethyl acetate, butyl acetate, etc., preferably ethyl acetate. . Examples of the ketone solvent include acetone, methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), diisobutyl ketone (DIBK), cyclohexanone, diacetone alcohol (DAA), and the like. Preferably, acetone, methyl ethyl ketone ( MEK). One type or two or more types of ester solvents and ketone solvents can be used, respectively.

  The “ester solvent and / or ketone solvent” is preferably an ester solvent alone or a combination of an ester solvent and a ketone solvent. In the case of the combined use of an ester solvent and a ketone solvent, the weight ratio of the ester solvent and the ketone solvent (ester solvent: ketone solvent) is preferably about 1: 1 to 2 or about 1 to 2: 1.

  In the treatment liquid of the present invention, the blending ratio ((B) :( C)) of (B) tertiary alcohol solvent and (C) ester solvent and / or ketone solvent is 5: 5 by weight. -8: 2 is preferable, and 6: 4-7: 3 is more preferable.

  In the case of a treatment liquid obtained by dissolving (B) a tertiary alcohol solvent and (A) chlorinated isocyanuric acid in (C) an ester solvent and / or a ketone solvent, the treatment liquid is It penetrates into the rubber molded body and the physical properties of the rubber molded body are lowered. In the case of a treatment liquid obtained by dissolving (A) a chlorinated isocyanuric acid in (B) a tertiary alcohol solvent without using (C) an ester solvent and / or a ketone solvent, However, it is difficult to obtain a sufficiently high adhesion-preventing effect.

  You may further mix | blend solvent other than (B) component and (C) component in the process liquid of this invention in the range which does not impair the effect of this invention.

  The method of applying (contacting) the treatment liquid of the present invention to the surface of the rubber molded body is not particularly limited, but a method of immersing the rubber molded body in the treatment liquid, a method of spray-coating the treatment liquid on the rubber molded body, rubber Although the method of brushing a processing liquid on a molded object is mentioned, an immersion process is preferable from a viewpoint that an operation | work is simple and an effect is acquired in a short time. The immersion time is preferably about 1 to 20 minutes, more preferably about 1 to 10 minutes. If it exceeds 20 minutes, the treatment liquid tends to permeate into the rubber molded body and lower the physical properties of the rubber molded body. After soaking, the rubber surface treatment solution is washed by immersing it in water or an organic solvent such as alcohol for several seconds, and then taken out and allowed to dry naturally at room temperature or hot air drying.

  The treatment liquid of the present invention exhibits an excellent anti-adhesive property imparting effect to a vulcanized rubber molded product, and also has an effect of imparting low friction to the surface of the vulcanized rubber molded product. Therefore, (i) the surface treatment process is performed after the rubber molding production process (that is, after the vulcanization molding process) and before the finishing process, and / or (ii) after the finishing process and before the inspection process. As a result, adhesion of rubber products (vulcanized rubber moldings) in the inspection process and the packaging process is prevented, and the inspection process and the packaging process. As a result, the handleability of rubber products (vulcanized rubber moldings) can be improved, and as a result, the production efficiency of rubber products can be improved.

  In particular, when the rubber product is a rubber product manufactured from a rubber composition containing a component that is likely to cause precipitation (bloom, bleed, etc.), precipitation occurs immediately after the rubber molded body preparation step (ie, vulcanization molding step). The effect of suppressing the subsequent precipitation, that is, the finishing process, the inspection process, the packaging process, and the like during storage and transportation after the packaging process by performing the surface treatment process on the vulcanized rubber molded body that has not been There is. Therefore, the method of the present invention is useful in producing a rubber product from a rubber composition having a compounding composition in which additive components (bloom, bleed, etc.) are likely to precipitate from the rubber molded body. As an example of a rubber composition having a compounding composition in which precipitation (bloom, bleed, etc.) of the additive component from the rubber molded body is likely to occur, for example, the following rubber composition A can be mentioned.

(Rubber composition A)
NBR: 100 parts by weight Zinc oxide: 1 to 10 parts by weight Stearic acid: 1 to 10 parts by weight Filler (carbon; SRF carbon): 20 to 120 parts by weight Plasticizer (DOP): 1 to 10 parts by weight Crosslinking agent (sulfur) ): 1 to 10 parts by weight Vulcanization accelerator: 1 to 10 parts by weight

  In addition, since the treatment liquid of the present invention imparts low friction to the surface of the rubber molded body without deteriorating the physical properties of the rubber molded body, the coefficient of friction against a metal surface such as nitrile rubber (NBR) is particularly high. In an aspect in which a sealing material is manufactured from a rubber composition containing a high rubber as a base component, a sealing material having excellent low friction with respect to a metal surface is efficiently manufactured without reducing the extensibility of the sealing material. Can do. Therefore, the method of the present invention is particularly suitable as a method for producing a sliding part sealing material.

  The method of the present invention can be applied to the production of various rubber products in various industrial fields. For example, automotive weather strips; automotive hoses (for example, brake hoses, radiator hoses, heater hoses, air cleaner hoses, etc.); Hose; gas hose; sealing material for building materials (for example, gasket, air tight, joint material, door stopper, etc.); sealing material for automotive seal (for example, O-ring, RL (radial lip), seal ring, etc.); Seals for construction machinery and hydraulic equipment seals (for example, O-rings, O-rings for cap seals, U-packings, rotary shaft seals, wear rings, D-rings, RL seals, etc.); (Piston packing, rod packing, X ring, etc.); Vacuum / semiconductor device seal ; Industrial instrument seal of the sealing member (cap seal ring and the like) are useful in the manufacture of rubber products, such as.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated more concretely, this invention is not limited at all by the following examples.

[Example 1]
(Production of rubber molding)
100 parts by weight of nitrile rubber as a rubber material, 0.5 parts by weight of sulfur as a crosslinking agent, 60 parts by weight of carbon black as a filler, 1.5 parts by weight of a crosslinking accelerator (TT: tetramethylthiuram disulfide), processing 1 part by weight of an auxiliary agent (stearic acid) and 5 parts by weight of a plasticizer (DOP) were put into a Banbury mixer and then vulcanized and formed into a sheet shape, 50 mm (length) × 20 mm (width) × 2 mm ( (Thickness) test pieces were prepared.

(Preparation of treatment solution)
(A) Trichloroisocyanuric acid as chlorinated isocyanuric acid, (B) tert-amyl alcohol (hereinafter also abbreviated as “tAA”) as tertiary alcohol solvent, (C) ester solvent and / or ketone system Ethyl acetate (hereinafter also abbreviated as “EA”) is used as a solvent, and the blending ratio of tAA and EA serving as a solvent is 4 of tAA: EA = 8: 2, 7: 3, 6: 4 and 5: 5. Four kinds of treatment liquids were blended so as to be as they were and mixed so that trichloroisocyanuric acid dissolved in each of them was 2% by weight, and mixed and stirred until they were uniformly dissolved.

(Surface treatment method)
The test piece is immersed in the treatment solution (liquid temperature: 30 ° C.) for a predetermined time (1 minute, 5 minutes, 10 minutes), taken out from the tank, and further immersed (washed) in 60 ° C. ion exchange water for 60 seconds. The sample was taken out, air-dried, and dried, and then subjected to the following evaluation tests.

[Evaluation test]
(1) Friction test (measurement of static friction coefficient and dynamic friction coefficient)
A surface property measuring instrument manufactured by HEIDON was used with reference to JIS K7125. On the horizontal test table, a ball indenter (SUS304) was applied to the test piece with a load of 100 g, and the coefficient of friction between the ball indenter and the test piece was measured when the test piece was moved horizontally at 75 mm / min.

(2) Anti-adhesion test When the treated surfaces of the test pieces are brought into contact with each other, a load of about 1 kg is applied for about 5 minutes from the top, and when the load is removed, the test pieces adhere to each other and give some vibration. If it does not separate at all even if it shakes or shakes, it is impossible (×), but it adheres, but if it is lightly shaken or shaken, it can be separated (△), and it does not adhere (○ ).

(3) Stretchability test The test piece is stretched by about 100% to 150%, and the surface is visually observed to make cracks impossible (×). What was observed when observed with a microscope (200 times) was acceptable (Δ), and what was not observed even at 200 times was judged good (◯).

The results of the above evaluation tests are shown in Tables 1 to 6 below.

From the results of Tables 1 to 6, the surface treatment liquid of the present invention can impart low friction and adhesion without reducing extensibility to the rubber seal that is a vulcanized rubber molded body. I understand.
Therefore, after the rubber molded body preparation step for preparing the vulcanized rubber molded body, by treating the surface of the vulcanized rubber molded body with the surface treatment liquid of the present invention, it is possible to prevent adhesion between the rubber molded bodies, It became clear that rubber products with the desired physical properties (physical properties) can be produced efficiently.

Claims (9)

(A) Chlorinated isocyanuric acid, (B) Tertiary alcohol solvent, (C) Ester solvent and / or ketone system after the rubber molded body manufacturing step for preparing a vulcanized rubber molded body from the rubber composition A method for producing a sealing material comprising a vulcanized rubber molded product, comprising a surface treatment step of attaching a treatment liquid containing a solvent to the surface of the rubber molded product. After the rubber molded body manufacturing process, a finishing process for removing unnecessary portions from the vulcanized rubber molded body obtained through the rubber molded body manufacturing process and an inspection process for performing an appearance inspection of the vulcanized rubber molded body that has undergone the finishing process are included. Or, in addition to the finishing step and the inspection step, further includes a packaging step of packaging the vulcanized rubber molded body that has undergone the inspection step,
2. The surface treatment process according to claim 1, wherein the surface treatment process is performed in (i) a period after the rubber molded body production process and before the finishing process and / or (ii) after the finishing process and before the inspection process . mETHODS.   The cleaning process and the drying process are further provided before the inspection process, and when the surface treatment process is provided after the finishing process and before the inspection process, the cleaning process and the drying process are performed after the surface treatment process. The method described in 1.   (A) The method according to any one of claims 1 to 3, wherein the chlorinated isocyanuric acid is trichloroisocyanuric acid.   (B) The method according to any one of claims 1 to 4, wherein the tertiary alcohol solvent is tert-amyl alcohol and / or tert-heptyl alcohol.   (B) The mixing ratio ((B) :( C)) of the tertiary alcohol solvent and (C) ester solvent and / or ketone solvent is 5: 5 to 8: 2 by weight ratio, The method of any one of claims 1-5. (A) content of the chlorinated isocyanuric acid, 1 to 10 wt% per total treatment liquid Method person according to any one of claims 1-6.   The rubber composition is nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), isoprene rubber (IR), butadiene rubber (BR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), butyl rubber (IIR). ), Natural rubber (NR), one or more rubbers selected from the group consisting of ethylene-propylene-diene rubbers (EPDM), and any one of claims 1 to 7, The method described.   The method according to any one of claims 1 to 7, wherein the rubber composition is a nitril rubber composition in which an additive is blended with nitril rubber.