JPS649941B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a rubberized fabric useful as a material for rubber boats, raincoats, mats, etc., and a method for manufacturing the same. Conventionally, rubber-coated fabrics are made using the so-called calendar topping method, in which rubber glue is subbed onto an arbitrary base material, a thin rubber film separated from a calendar is laminated onto this, and the layers are bonded under pressure using a pressure roll, etc. A thin rubber film was laminated on a base material using a method called ``2'', powder was sprinkled on the thin rubber film, brushing was performed, and the product was vulcanized. However, manufacturing rubberized fabric using this calendar topping method requires a large device called a calendar, and requires multiple steps such as applying rubber glue, calendar topping, and vulcanization. It is complicated, requires a huge investment in equipment, requires a large installation space, and requires a large number of workers. Furthermore, the vulcanization process usually requires heating to at least 130°C or higher, and is one of the processes that consumes a large amount of energy. In addition, it is common for rubberized fabrics to be coated with powder to make them slippery, to prevent the rubberized fabrics from sticking to each other, and to maintain a non-sticky feel. The adhesion to the rubberized fabric was poor, and sufficient powder coverage could not be expected. Furthermore, when the rubberized fabric is put into practical use as a product, as time passes, the powder particles fall off from the rubberized fabric, resulting in a loss of lubricity. Another method is to dissolve the rubber compound in a solvent, apply the dissolved rubber compound onto the base material, and heat it in a heating oven or the like to evaporate the solvent and form a rubber layer on the base material. Spread powder on the rubber layer, brush it, and then heat it to 130℃.
There was a method of vulcanization at higher temperatures. However, like the calendar topping method, this method also involves a vulcanization step that requires high temperatures and consumes a large amount of energy. In addition, the problem of the slipperiness of dusting was similar to that of products produced by the calendar topping method. Furthermore, in this method, when producing long products, the viscosity of the pre-melted rubber compound melt changes over time and thickens, making it difficult to apply uniformly, making it impossible to obtain a satisfactory product. Furthermore, when forming a thick rubber layer on a base material, the amount of solvent in the dissolved rubber compound is as high as 50% or more.
If applied thickly at once, bubbles will be generated in the rubber layer formed by air entrainment and solvent volatilization, leading to product defects. Therefore, thin coatings must be repeated several times. This method has the disadvantage of increasing the number of steps. Additionally, in order to overcome the drawbacks of the above-mentioned prior art, the applicant has already proposed a rubberized fabric in which a reaction product of liquid rubber and polyisocyanate is laminated on at least one side of a base material, and a method for producing the same ( (Special Application No. 136730, 1982). Specifically, Japanese Patent Application No. 56-136730 describes a method in which the base material is subjected to some type of weave sealing treatment, and then liquid rubber is applied to obtain a drawn fabric, and a method in which liquid rubber is applied onto release paper to obtain semi-woven fabric. A transfer method is described in which the substrates are heated so as to be in a crosslinked state, then the base materials are laminated together, and further heating is performed to complete the crosslinking. The former is a manufacturing method in which liquid rubber is applied directly onto the base material.
When the thickness of the base material is thin, or when the base material has a coarse weave, it is necessary to use some type of sealant to prevent the overcoated liquid rubber from seeping out from the weave. For example, in the case of woven fabrics using nylon threads, specific methods include passing the woven fabric through heated rolls at 180°C or higher to melt it and closing the eyes, or subbing with so-called rubber glue, which is made by dissolving rubber compound in a solvent. There are methods such as covering the weave with a thin rubber layer. However, the heat treatment requires an extremely high temperature of 180°C or higher, which is difficult to say economical, and the heat treatment also has the drawback of producing a strong gloss on the surface of the original fabric. In this method, subbing is applied to the original fabric that has been finished with dyeing and softening, which makes the process complicated and uneconomical, and it is difficult to adjust the method to completely suppress leaching when applying the subbing paste. It is also undesirable that it has difficult disadvantages, and furthermore, the texture of the original fabric becomes hard due to the effect of sealing the weave by applying the subbing paste. The latter uses a release paper and does not require pre-treatment of the original fabric as in direct coating, but there is a technical limitation in that the curing state of the liquid rubber coated on the release paper must be accurately controlled. In other words, if the curing of the liquid rubber is insufficient, the liquid rubber will ooze out when laminated with the original fabric, which requires advanced technology to accurately reproduce the curing condition that is just right for lamination. be. The purpose of the present invention is to provide a rubberized fabric and a method for manufacturing the same that eliminate the drawbacks of the prior art described above. They discovered that a rubberized fabric with excellent properties could be obtained by coating a material with a reaction product of a liquid rubber treated with an oil repellent and a polyisocyanate, and also succeeded in developing a method for producing the same. It was completed. That is, the gist of the present invention is a rubber-coated fabric characterized in that it is formed by laminating a reaction product of liquid rubber and polyisocyanate on at least one side of a base material that has been previously treated with oil repellency. Another aspect of the present invention is to apply an oil-repellent treatment to a base material, and then directly apply the liquid rubber and polyisocyanate mixed by continuous stirring using a mixing and dispensing machine to at least one side of the base material. Alternatively, there is provided a method for producing a rubberized fabric, which is characterized by laminating by transfer. As the base material that can be used in the present invention, all base materials that are normally used for rubberized fabrics can be used.
Examples include fabrics such as polyamide, polyester, polyurethane, polypropylene, vinylon, cotton, and hemp. In the present invention, as the oil repellent agent, commonly used agents can be used, but water and oil repellent agents that also have water repellency are preferred. A fluorine-based compound can be used as the water and oil repellent treatment agent, and a specific example of this is Scotch Guard.
FC-232 (manufactured by 3M, solid content 30% emulsion), Scotchigard FC-905 (same as above, solid content 10)
% solution), Deck Guard F-50 (manufactured by Dainippon Ink Co., Ltd., solid content 14% emulsion), Asahi Guard
Examples include AG-710 (manufactured by Asahi Glass Co., Ltd., emulsion with a solid content of 18%) and Asahi Guard AG-650 (manufactured by Asahi Glass Co., Ltd., a solution with a solid content of 15%). These processing agents can be used alone or in combination of two or more, and are used in the form of solutions, emulsions, etc. However, considering the performance as a processing agent and the risks involved in processing, emulsions with a solid content of 10 to 30% are recommended. is preferred. The amount of these treatment agents attached to the substrate is preferably 10% or less as a solid content of the treatment agent based on the total weight of the substrate.
It is 0.1-1%. In addition, in general, drying of the processing agent,
Heat treatment is performed for cure, and the treatment temperature is
The temperature is 100℃ or higher, and the processing time is about 20 seconds to 10 minutes.
It is preferable to carry out the reaction at 150 to 170°C for 3 minutes to 20 seconds.
In addition, an antistatic agent, a flame retardant, and a water/oil repellent processing aid can be added to the processing agent as necessary.In particular, the water/oil repellent processing aid is used to coat the fibers of the water/oil repellent processing agent. Specific examples thereof include cationic, anionic, nonionic surfactants, and solvents, which may be used alone or in combination of two or more. In the present invention, liquid rubber is defined as having an average molecular weight that exhibits fluidity at room temperature and has a crosslinkable functional group such as a carboxyl group, hydroxyl group, mercapto group, halogen atom, amino group, aziridino group, or epoxy group at the molecular end. 500 to 10,000 polybutadiene, polyisoprene, polychloroprene, butadiene-isoprene copolymer, acrylonitrile-butadiene copolymer, styrene-butadiene copolymer, and other telechelic liquid rubbers, which may be used alone or Two or more types may be used in combination. In the present invention, the polyisocyanate includes hexamethylene diisocyanate, biphenyl diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, etc., and modified products thereof,
All general polyisocyanates for urethane such as derivatives and crude products can be used. Although the NCO/OH ratio may be arbitrary, it is preferably in the range of NCO/OH=100 to 110/100. Among the above liquid rubbers, highly reactive liquid polybutadiene having an allyl-type primary OH at the molecular end is particularly preferred. In the present invention, the liquid rubber includes fillers, water absorbing agents, reaction regulators, crosslinking agents, anti-aging agents, process oils, urethanization catalysts, blend polyols, which are commonly used compounding components to improve physical properties.
Colorants, solvents, etc. can be used in combination. The above fillers include calcium carbonate, activated calcium carbonate, clay, white carbon, various carbon blacks, aluminum hydroxide, zinc white,
Aluminum sulfate, calcium sulfate, talc, magnesium carbonate, mica, asbestos, pumice powder,
All fillers that are generally mixed into solid rubber, such as rubber powder, wood flour, cork powder, PVA fiber, and cellulose powder, can be used, and these can be used alone or in combination of two or more. The amount added is liquid rubber 100
300 parts by weight or less, preferably 100 to 300 parts by weight
200 parts by weight can be used. In addition, foaming may occur in products due to the influence of water adsorbed by fillers, but to prevent this foaming phenomenon, we use quicklime, silane coupling agents, titanate coupling agents, various molecular sieves, anhydrous calcium sulfate, sulfuric acid, etc. Water-absorbing fillers with high water-absorbing properties such as copper, magnesium sulfate, sodium sulfate, activated alumina, potassium carbonate, and magnesium oxide can be used, and these can be used alone or in combination of two or more. By using this water-absorbing filler, it is possible to prevent foaming caused by water adsorbed by the filler, and a good rubberized fabric can be obtained. Examples of reaction regulators include sulfuric acid, hydrochloric acid, acetic acid, tartaric acid, benzoic acid, formic acid, stearic acid, phosphoric acid, oxalic acid, maleic acid, malic acid, fumaric acid, salicylic acid, sodium hydroxide, potassium hydroxide, Alkalies such as sodium bicarbonate can be used. These reaction regulators can be used alone or in combination with both acids and alkalis, but acids and alkalis cannot be used at the same time. The amount of the reaction regulator added is 50 parts by weight or less, preferably 1 to 10 parts by weight, per 100 parts by weight of the liquid rubber. This reaction regulator has the function of accelerating or delaying the urethanization reaction between the liquid rubber and the polyisocyanate. As a crosslinking agent, a low-molecular-weight hydroxyl compound having two or more functionalities can be used, and specific examples thereof include 1, 4,
-butanediol, 1,5-pentanediol,
ethylene glycol, diethylene glycol,
1,6-hexanediol, neopentyl glycol, glycerin, diethanolamine, triethanolamine, trimethylolpropane, hydroquinone, bisphenol A,N,N-bis(2-hydroxypropyl)aniline, N,N-
Examples include bis(2-hydroxyethyl)aniline and ethylenediamine. The amount of these crosslinking agents added is 50 parts by weight or less per 100 parts by weight of liquid rubber.
Preferably 1 to 20 parts by weight are used. As the anti-aging agent, general ultraviolet absorbers, antioxidants, etc. can be used. Examples include benzotriazoles, benzophenones, salicylic acid derivatives, monophenols, naphthylamines, phenylenediamines, polyphenols,
Carbamates, waxes, etc. can be used, and these can be used alone or in combination of two or more types. The amount of anti-aging agent added is 20 parts by weight or less, preferably 0.1 to 10 parts by weight, per 100 parts by weight of liquid rubber. As the process oil, aromatic, naphthenic and paraffinic lubricating oils can be used, such as
Plasticizers such as DOP, spindle oil, vegetable oil, etc. can be used, and these can be used alone or in combination of two or more. The amount of process oil added is 100 parts by weight or less, preferably 10 to 50 parts by weight, per 100 parts by weight of liquid rubber. As the urethanization catalyst, a usual urethanization catalyst can be used, and examples thereof include amines, organic tins, and the like. These urethanization catalysts can be used alone or in combination of two or more. As the blend polyol, all polyols for urethane that can be blended with liquid rubber can be used, and both polyester polyols and polyether polyols can be used. This blend polyol may have any number of functional groups, molecular weight, etc., but from the viewpoint of reactivity, one with a high primary OH value at the molecular end is preferred. As the coloring agent, both organic pigments and inorganic pigments can be used, and flame retardants, antistatic agents, etc. can also be added as necessary. As a solvent, a hydrocarbon compound (for example, n-butane, n-pentane, n-hexane, gasoline,
petroleum spirits, cyclohexane, etc.), aromatic hydrocarbon compounds (e.g. benzene, toluene, xylene, ethylbenzene, etc.), halogenated hydrocarbon compounds (e.g. methyl chloride, methylene chloride,
chloroform, carbon tetrachloride, ethyl chloride, ethylene chloride, trichloroethane, tetrachloroethane, trichlorethylene, tetrachloroethylene, trichloromonofluoromethane, dichlorodifluoromethane, etc.), halogenated aromatic hydrocarbon compounds (e.g. chlorobenzene) , chlorotoluene, bromobenzene, etc.), ether compounds (e.g. ethyl ether, isopropyl ether, dioxane, tetrahydrofuran, etc.), ketone compounds (e.g. acetone, methylacetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.), ester compounds ( For example, ethyl acetate, methyl acetate, isobutyl acetate, ethyl propionate, methyl propionate, etc.) can be used. In addition, water and alcohol compounds can also be used. These solvents are added to the liquid rubber compound as necessary to adjust the viscosity of the rubber compound and facilitate handling and mixing with isocyanate. The amount of the solvent added is 100 parts by weight or less, preferably 1 to 10 parts by weight, per 100 parts by weight of the liquid rubber. In order to mix the various liquid rubber additive components as described above, a general rubber paste stirrer or the like can be used to sufficiently disperse the mixture, and if necessary, it is preferable to pass the mixture through a three-roll mill or the like for uniform dispersion. Next, a method for manufacturing the rubberized fabric of the present invention will be described. First, the above oil repellent treatment agent is prepared in a dipping tank, and the base material is immersed in the dipping tank to be impregnated with the oil repellent treatment, and then squeezed with a mangle to adjust the adhesion amount to a desired amount, and then heated to 150 to 170°C. Heat it for 3 minutes to 20 seconds to cure it. It is preferable to simultaneously perform the water-repellent treatment using a water- and oil-repellent treatment agent in the oil-repellent treatment, since there is no need for a separate water-repellent treatment. Next, liquid rubber and polyisocyanate are separately charged into separate tanks, and each tank is continuously led to a mixing discharge machine. Dispense directly and apply evenly to at least one side using a doctor knife, etc. Next, the base material coated with the liquid rubber and polyisocyanate is heated in a crosslinking furnace, usually at room temperature to
Crosslinking is carried out at 120° C. for 10 to 3 minutes to obtain a rubberized fabric having a reaction product of liquid rubber and polyisocyanate laminated on at least one side. In the method of the present invention, another method for laminating the above-mentioned reaction product on the base material is a transfer method.
In this method, first, liquid rubber and polyisocyanate are mixed and stirred using a mixing and discharging machine, then discharged onto a release paper, coated uniformly with a doctor knife, etc., and then brought into a semi-crosslinked state in a first crosslinking furnace. The base material and the release paper are bonded together using a bonding pressure roll or the like so that the coating layer faces the base material, and then crosslinking is performed in a second crosslinking furnace, and the release paper is peeled off and laminated. Here, the first crosslinking conditions are usually 120°C or lower, preferably 80 to 120°C for 60 minutes to 30 seconds, preferably 10 minutes to 30 seconds.
In this case, the base material has been treated with oil repellency in advance, so the liquid rubber will not seep out from the base material when the temperature is low, and strict crosslinking conditions are not required. . The second crosslinking conditions can be the same as those for applying directly to the base material. Further, as the release paper, for example, silicone release paper, polypropylene release paper, polyethylene terephthalate film, etc. can be used. The surface of the reaction product is dusted with flour in order to prevent the surface of the rubber-coated fabric of the present invention obtained in this manner from becoming sticky and to impart slipperiness. This dusting powder can be one that can be used for ordinary rubber products, and specific examples include talc, silica, ebonite powder, zinc stearate, zinc white, magnesium carbonate, calcium carbonate, clay, and aluminum oxide. Can be mentioned. In addition, reactive flours having hydroxyl groups that react with polyisocyanate, such as starches such as wheat, corn starch, and potato starch, cellulose, etc., can be used; in this case, since they have excellent binding properties with the reaction product, preferable. The rubberized fabric of the present invention can be used, for example, for rubber boats, raincoats, mats, etc., and the flexibility, water pressure resistance, weather resistance, tensile strength, tear strength, etc. required for the material are equivalent to conventional rubberized fabrics. It has a value of . As explained above, in the rubberized fabric of the present invention, the reaction product of liquid rubber and polyisocyanate is laminated on the base material that has been previously treated with oil repellency, so the reaction product will not seep out from the base material. It has a good appearance, excellent peel strength and texture, and does not thicken over time like conventional solvent-dissolved rubber compounds, so it always maintains a stable coating layer. In addition, powder can be applied better to the cloth than conventional rubber-coated cloth using solid rubber, and it does not fall off, so it can maintain slipperiness. Furthermore, according to the manufacturing method of the present invention, the base material is subjected to an oil repellent treatment prior to applying liquid rubber or the like to the base material. It is possible to prevent liquid rubber etc. from seeping out from the weave without performing such complicated and troublesome processing. Furthermore, when a water- and oil-repellent treatment agent is used, water- and oil-repellent treatments can be performed simultaneously, so there is no need to provide a separate water-repellent process, which further simplifies the process. Further, according to the method of the present invention, since the crosslinking is performed by a urethanization reaction, vulcanization in a high temperature atmosphere of 130°C or higher, which was conventionally essential, is not necessary, and it can be carried out in a low temperature atmosphere of 120°C or lower. In addition to saving resources, deterioration and shrinkage of the base material and volatilization of low boiling point components (e.g. process oil) due to high temperature vulcanization are less likely to occur, and the rubberized fabric does not curl up. Workability is improved in secondary processing such as sewing and adhesion, and furthermore, it is not necessary to use solvents conventionally used when forming the rubber layer, so resources can be further saved. Furthermore, as in the transfer method described in Japanese Patent Application No. 56-136730, it is necessary to strictly create crosslinking technical conditions for liquid rubber in a semi-crosslinked state that ensures adhesive strength with the base fabric and prevents seepage from the base fabric. There is no problem, and there is a high degree of freedom in crosslinking conditions. Furthermore, the texture and appearance of the oil-repellent fabric is exactly the same as that of untreated fabric, and the texture of the finished fabric can be changed freely, but the undercoating causes sealing of the fabric and the texture. This method is superior to the conventional fabric manufacturing method, which results in stiffness. Furthermore, the effect of this oil repellent is that it prevents contamination by sewing machine oil when sewing fabrics. Various sewing machines are used to sew the fabric, and the oil used to improve the passage of the sewing machine needle into the fabric often contaminates the fabric. Because of the oil repellent, there is no oil contamination and it is possible to freely and efficiently sew light-colored to dark-colored fabrics using a sewing machine. There is no need to take the trouble of removing oil stains after sewing. Furthermore, according to the present invention, since the oil-repellent treatment is applied, powder, dust, etc. do not adhere to the product during product manufacturing, and sand, mud, etc. do not adhere to the product during product use. It is something that can exhibit dirty properties. EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples, but the present invention is not limited by these Examples. Example 1 Immediately after dyeing and finishing nylon taffeta with 70 denier nylon threads of 100 lengths and 90 pieces horizontally, it was immersed in a dipping tank containing a fluorine-based oil and water repellent treatment agent with the following composition to dye and finish it. and oil and water repellent treatment. Next, the pick-up amount was squeezed with a mangle so that the basis weight was 40% based on the weight of nylon, and then drying was performed at 160° C. for 30 seconds. Incidentally, the dyeing and oil/water repellent treatment were carried out at a speed of 50 m/min. Blend Parts by weight Scotchigard FC-232 5 Water 95 Finetex NRW-3 (surfactant manufactured by Dainippon Ink) 0.05 Next, liquid rubber of the following composition (viscosity 40000 CPS/25
℃, measured by Bruckfield type), stirred uniformly, and poured into the first tank. Compound Weight part Liquid polybutadiene rubber (PolyBDR-45HT
ARCO) 100 Aluminum hydroxide 150 N,N bis(2-hydroxypropyl)aniline 5 BHT (tert-butylhydroxytoluene) 1 DOP (dioctyl phthalate) 5 Titanium oxide 10 Dibutyltin dilaurate 0.01 Next, polyisocyanate (millionate)
Pour MTL (manufactured by Nippon Polyurethane Co., Ltd.) into the second tank. Guided from each tank to the mixing discharge machine,
The two liquids, whose NCO/OH index was adjusted to 105, were continuously mixed, stirred and discharged, and continuously coated on the oil- and water-repellent treated nylon taffeta at a basis weight of 100 g/m ² . Next, crosslinking was carried out at 100°C for 3 minutes in a crosslinking furnace, and after wheat starch was sprinkled on the cloth, it was brushed to obtain a wound rubberized cloth. Example 2 Example 1 except that the crosslinking conditions were 120°C and 2 minutes.
A rubberized fabric was obtained in the same manner as above. Example 3 A rubberized fabric was obtained in the same manner as in Example 1, except that the crosslinking conditions were 90°C and 5 minutes. Example 4 The same nylon taffeta used in Example 1 was treated with an oil and water repellent treatment agent of the following composition at a processing speed of 15 m/min, and then the same procedure as in Example 1 was carried out to obtain a rubberized fabric. . Formulation Part by weight Scorchguard FC-232 5 Water 95 Example 5 The same nylon taffeta as in Example 1 was treated to be oil and water repellent in the same manner as in Example 1, except that an oil and water repellent treatment agent of the following formulation was used. Mixture Parts by Weight Scotchgard FC-905 5 Mineral Turben 95 Next, a liquid rubber with the same composition as in Example 1 was used, except that the viscosity was 90000 CPS/25°C, and the subsequent operations were carried out with the exception that the basis weight was 110 g/m ² A rubberized cloth was obtained in the same manner as in Example 1. Example 6 After treating in the same manner with the same nylon taffeta and the same oil and water repellent as used in Example 1, liquid rubber and polyisocyanate of the same composition were deposited at 100 g/cm on silicone release paper at the same mixing discharge ratio. Continuously applied with a basis weight of ² . Next, crosslinking was performed at 90° C. for 3 minutes in a first crosslinking furnace to obtain a semi-crosslinked state, and then the treated nylon taffeta was bonded together using a press roll.
This was crosslinked by heating at 100° C. for 2 minutes in a second crosslinking furnace, and while the silicone release paper was peeled off, wheat starch was sprinkled and brushed to obtain a wound rubber coated cloth. Comparative Example 1 A rubberized fabric was obtained in the same manner as in Example 1 except that the oil and water repellent treatment was not performed. Comparative Example 2 A dyed nylon taffeta similar to that of Example 1 was prepared, and the taffeta was passed through a heated roll at 200°C to completely crush the weave. Next, this nylon taffeta was continuously coated with the same liquid rubber and polyisocyanate as in Example 1 using a mixing and dispensing machine at the same mixing ratio as in Example 1 at a basis weight of 100 g/m ² , and then coated in a crosslinking furnace at 100°C for 30 minutes. Cross-linking was carried out for a minute, and wheat starch was sprinkled and brushed. Finally, the silicone zirconium salt-based water repellent agent Zircocet CHM-1
(manufactured by Shichifuku Chemical, solid content 23%) was gravure coated on the nylon taffeta side with a 5% aqueous solution and dried at 130°C for 30 seconds to obtain a rubberized fabric. Comparative Example 3 A dyed nylon taffeta similar to that in Example 1 was prepared, and chloroprene rubber glue (solid content 50%, solvent toluene) was applied onto the nylon taffeta.
It was coated with a basis weight of 40 g/m ² and immediately dried at 100° C. for 1 minute. The fabric was then treated in the same manner as in Example 1, and finally water-repellent treated in the same manner as in Comparative Example 2 to obtain a rubberized fabric. Comparative Example 4 Liquid rubber and polyisocyanate having the same composition as used in Example 1 were continuously coated onto silicone release paper at a basis weight of 100 g/m ² at the same mixing and discharge ratio. Next, crosslinking was performed at 90°C for 3 minutes in a first crosslinking furnace to create a semi-crosslinked state, and then the nylon taffeta was laminated and crimped with a pressure roll, but the crosslinking of the liquid rubber was not sufficient, and the liquid rubber was It seeped out from the nylon taffeta. This was heated to 100℃ in a second crosslinking furnace.
Heat crosslinking was performed for 2 minutes, and while the silicone release paper was peeled off, wheat starch was sprinkled and brushed.
Finally, the same water repellent treatment as in Comparative Example 2 was carried out to obtain a rubberized fabric, but a good rubberized fabric could not be obtained because the liquid rubber oozed out. Comparative Example 5 A styrene-butadiene rubber-based rubber base paste was applied to the same nylon taffeta as in Comparative Example 2 at a basis weight of 30 g/m ² , heated at 100° C. for 1 minute, and then rolled up. Next, a thin rubber film of styrene-butadiene rubber separated to a basis weight of 100 g/m ² using a calender was topped with the subbed nylon taffeta, and then wheat starch was sprinkled, brushed, and wound up. Next, it was vulcanized in a vulcanization oven at 150°C for 5 minutes, and then subjected to the same water repellent treatment as in Comparative Example 2 to obtain a rubberized fabric. Test Example The peel strength and texture of the rubberized fabrics obtained in Examples and Comparative Examples were measured. The peel test method is to buff the rubber surface and then apply chloroprene rubber glue (solid content 50%, solvent toluene).
100 parts by weight of polyisocyanate desmodule
This was done by applying 3 parts by weight of RF (manufactured by Bayer) on the surface, pasting the rubber surfaces together and measuring the peel strength between the curing rubber and the base fabric.The texture was determined using the JIS L1079 cantilever method. Measured according to. The results are shown in Table 1. The appearance of the rubberized fabrics obtained in Examples and Comparative Examples is also shown.

【table】

【table】

Claims (1)

[Scope of Claims] 1. A rubber-coated fabric comprising a base material that has been previously treated with oil repellency and a reaction product of liquid rubber and polyisocyanate layered on at least one side of the base material. 2. The rubberized fabric according to claim 1, wherein powder is sprinkled on the surface of the reaction product. 3. The rubberized fabric according to claim 2, which is made by blending liquid rubber with a water-absorbing agent. 4. The rubberized fabric according to claim 3, which is obtained by blending a reaction modifier with liquid rubber. 5. A base material is subjected to an oil repellent treatment, and then liquid rubber and polyisocyanate are continuously stirred and mixed using a mixing and discharging machine, and the mixture is directly applied to at least one side of the base material or laminated by transfer. A method of manufacturing rubberized cloth.