JP2001058707A - Foundation cloth for conveyor belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display excellent adhesiveness with rubber, even if adhering amount of an adhesive agent composition is reduced, by adding the adhesive agent composition added with a silicic anhydride colloidal solution to woven fabric made of fiber for reinforcing rubber. SOLUTION: Stability of viscosity of an adhesive agent composition solution is improved and an adhesive matrix component can be evenly adhered to a surface of fiber by using the silicic anhydride colloidal solution existing in a colloidal state with a particle size of about 50 μm or below and containing silicon dioxide particles and sodium oxide as pH regulating agent by adding the solution to an adhesive agent composition. This is due to formation of hydrogen bonding of a matrix effective component of the adhesive agent composition with a polar group of a rubber material through silicon dioxide formed on the surface of fiber. Therefore, excellent adhesive property with rubber can be displayed, even if amount of the adhesive is reduced as compared with conventional amount, by uniformly adhering the adhesive agent composition to the fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base material for a conveyor belt used as a reinforcing material for a conveyor belt used in an industrial machine. More specifically, a high-grade base fabric for conveyor belts that can exhibit excellent adhesiveness to rubber even when the amount of the adhesive agent composition is reduced, and has excellent flexibility and fatigue resistance. It is about.

[0002]

2. Description of the Related Art Conventionally, as a reinforcing material (reinforcing fiber) for a conveyor belt, a reinforcing fiber suitable for characteristics according to a use is selected from vinylon fiber, polyester fiber, aliphatic polyamide fiber and aromatic polyamide fiber. It is appropriately selected and used, and is used in practical use as a conveyor belt in a state in which rubber or a flexible resin is coated on the base fabric including the reinforcing fibers.

However, in the field of conveyor belts, if the hardness of the reinforcing base fabric is harder than that of the rubber or flexible resin covering the same, for example, the adhesion between the rubber and the reinforcing base fabric is required. It has been regarded as a problem that poor resistance results in a drawback of poor fatigue resistance. The properties required for the base fabric for a conveyor belt include high strength, high elastic modulus, low elongation, chemical resistance, adhesiveness, and the like.

[0004] That is, when a reinforcing base fabric having a high elongation is used, the conveyor belt sags over time, and for the purpose of improving the slack, vinylon fibers, polyester fibers and A base fabric made of a woven fabric using fibers selected from aromatic polyamide fibers for warp and aliphatic polyamide fibers for weft is generally used.

[0005] In addition, the base fabric for the conveyor belt is generally used by applying an adhesive treatment agent in order to improve the adhesiveness with rubber or a flexible resin. As a treatment agent, a treatment agent developed for a tire cord is actually applied as it is.

As a typical example, as a typical adhesive treatment agent conventionally known, there are 2,6-bis (2 ', 4'-dihydroxyphenylmethyl) -4-chlorophenol. A mixture of a reaction product of a halogenated phenol, resorcinol and formaldehyde with a mixture (RFL) of an initial condensate of resorcinol and formaldehyde and rubber latex is disclosed in JP-B-46-1.
No. 1251.

However, when the adhesive treatment composition described in Japanese Patent Publication No. 46-12551 is used, it is necessary to increase the amount of the adhesion treatment composition adhered to the base cloth and to perform high-temperature treatment without performing the treatment. However, it is not suitable to be applied to a woven fabric (base fabric) using different fiber types for the warp and the weft as described above because of the problem that the adhesive strength cannot be obtained.

Japanese Patent Publication No. 57-29586 discloses an epoxy compound / blocked isocyanate /
A so-called two-bath treatment method has been proposed in which the treatment is performed with a first treatment liquid comprising a mixed solution containing bentonite, and then treated with a second treatment liquid in which an ethylene urea compound is added to RFL. However, since the true specific gravity of the bentonite contained in the first treatment liquid is large and the particle diameter thereof is large, there is a problem that the treatment liquid does not have viscosity and sediments, thereby affecting the stability of the liquid.

Japanese Patent Publication No. 60-24226 discloses an epoxy compound / blocked isocyanate /
A two-bath treatment method has been proposed in which a first treatment liquid composed of a latex mixture is applied, and then a second treatment liquid composed of RFL is applied. However, in this method, the initial adhesive force (pulling force) is high. However, there is a problem that the treated cord becomes hard and the strength of the cord is reduced, and the life of the obtained belt is shortened because the cord is harder than rubber or flexible resin.

On the other hand, for the aromatic aramid fiber, a technique for improving the adhesiveness to rubber has been studied. For example, Japanese Patent Application Laid-Open No. Hei 3-40875 discloses an aromatic aramid fiber comprising a polyepoxy compound / blocked isocyanate compound / rubber. A first treatment consisting of a mixture of latex, followed by a second treatment in which a special chlorophenol compound is added to the RFL.
Although a method of treating with a treatment liquid has been proposed, in this method, although a value close to that of polyester fiber can be obtained, it is necessary to increase the amount of the adhesive to be attached, so that the reinforcing material becomes harder. On the other hand, there has been a problem that the cost increases.

[0011]

SUMMARY OF THE INVENTION The present invention has been achieved as a result of studying solving the above-mentioned problems in the prior art, and in particular, improving a base fabric used for reinforcing a belt conveyor. Therefore, an object of the present invention is to provide a high-quality conveyor which can exhibit excellent adhesiveness to rubber even if the amount of adhesion treatment agent composition is reduced, and which has excellent flexibility and fatigue resistance. An object of the present invention is to provide a base fabric for a belt.

[0012]

Means for Solving the Problems In order to solve the above-mentioned problems, a base fabric for a conveyor belt of the present invention mainly has the following constitution. That is, the present invention provides a base fabric for a conveyor belt, which is obtained by applying an adhesive treatment composition obtained by adding a colloidal solution of silicic anhydride to a woven fabric made of rubber reinforcing fibers.

In the base fabric for a conveyor belt of the present invention, the following conditions (1) to (10) are preferable conditions, and further effects can be expected by applying these conditions. (1) The particle size of the silicic anhydride is 50 μm or less. (2) The amount of the silicic anhydride added to 100 parts by weight of the adhesive matrix component in the adhesive treatment composition is 1 to 1
3 parts by weight. (3) The adhesive matrix component in the adhesive treatment composition is mainly composed of a mixture (RFL) of a resorcinol-formalin precondensate and a rubber latex, a polyepoxide compound, a blocked isocyanate and / or an ethylene urea compound. thing. (4) The warp made of the rubber reinforcing fiber constituting the woven fabric is made of a polyester fiber having an intrinsic viscosity of 0.7 or more using ethylene terephthalate as a main repeating unit. (5) The dry heat shrinkage at 160 ° C. of the rubber reinforcing fiber of (4) is 3% or less. (6) Nylon 66 having at least 95 mol% of hexamethylene adipamide units and a sulfuric acid relative viscosity of 3.0 or more, wherein the weft comprising the rubber reinforcing fiber constituting the woven fabric of (4) and (5) is used. Be composed of fiber. (7) The adhesion treatment composition of (4), (5) or (6) has a solid content of 2.0 to 4.0 on the fabric.
% By weight. (8) The warp made of the rubber reinforcing fiber constituting the woven fabric is made of an aromatic polyamide fiber. (9) The weft comprising the rubber reinforcing fibers constituting the woven fabric of the above (8) is composed of at least 95 mol% of hexamethylene adipamide units, and is composed of nylon 66 fibers having a sulfuric acid relative viscosity of 3.0 or more. . (10) The adhesion content of the adhesive treatment composition of (8) and (9) to the fabric is 2.5 to 6.0% by weight.
That.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. In the base fabric for a conveyor belt of the present invention, the silicic anhydride contained in the adhesive treatment agent composition that coats the surface of a woven fabric obtained by weaving a reinforcing polyester fiber, an aromatic polyamide fiber, an aliphatic polyamide fiber, etc. The colloidal solution is made of silicic anhydride having a content of 99% or more.

The particle size of the silicic anhydride is preferably 50 μm or less, and it is desirable that the silicic anhydride exists in a colloidal state in the adhesive treatment composition. The colloidal solution of silicic anhydride contains silicon dioxide particles and sodium oxide as a pH adjuster and has a pH of 8.5 to 10.5, and is mainly used as the first treatment liquid in the two-bath treatment method. It is desirable to be added.

By using this silicic anhydride added to the adhesive treatment composition, the viscosity stability of the adhesive treatment composition solution is improved, and the adhesive matrix component can be uniformly attached to the fiber surface. Is obtained. And, even when the adhesive treatment composition is uniformly adhered to the fiber, even if the adhesive adhesion amount is reduced compared to the conventional one, it becomes possible to exhibit excellent adhesiveness with rubber, and furthermore, flexibility. A high-quality conveyor belt base fabric having excellent fatigue resistance can be provided.

In the present invention, the reason why such an effect is exhibited is not clear, but silicon dioxide (SiO ₂ ) is formed on the fiber surface by blending a colloidal solution of silicic anhydride, and the silicon dioxide (SiO ₂ ) is removed. Through, in order to form a hydrogen bond with the polar group of the rubber material with the polyepoxide compound, the isocyanate compound and the rubber latex, which are the matrix active components of the adhesive treatment composition,
It is considered that a strong adhesive force is exhibited between the fiber and the rubber.

The silicic anhydride used in the present invention preferably has a particle diameter of 50 μm or less, particularly preferably 30 μm or less. By setting the particle size to 50 μm or less, the dispersion of the adhesive treatment composition in the solution becomes uniform, and thus the adhesive treatment composition is uniformly attached to the fibers, and the adhesion to rubber is improved.

Also, sodium oxide is added as a pH adjuster for the anhydrous silicate colloid solution. In order to maintain the pH of the anhydrous silicic acid colloid solution in the range of 8.5 to 10.5, the amount of sodium oxide added is 0.2 to the anhydrous silicic acid.
It is preferably about 0.6% by weight.

Further, the viscosity of the colloidal solution of silicic anhydride is set to 3 to 10 centipoise, and the concentration of silicic anhydride in the colloidal solution is set to 20 to 31% by weight, so that the adhesive treatment composition can be uniformly dispersed in the solution. This is preferable from the viewpoint of uniform adhesion of the adhesive treatment composition to the fiber, and as a result, a base fabric for a conveyor belt having more excellent adhesion to rubber can be obtained.

Further, in the base fabric for a conveyor belt of the present invention, the above-mentioned silicic anhydride contained in the adhesive treatment composition covering the surface of the reinforcing polyester fiber and the aromatic polyamide fiber constituting the warp is hydrophilic. Therefore, water molecules in the adhesive treatment composition are adsorbed and penetrate into the fiber cord, and the penetration of the adhesive matrix component such as an epoxy compound, an isocyanate compound and a rubber latex into the fiber cord is suppressed. Therefore, when heat treatment is performed in this state, the matrix component is solidified in the surface layer portion of the fiber cord, so that the degree of freedom between single fiber yarns is large, and the flexibility of the base fabric for a conveyor belt is improved.

That is, even though silicic acid acts as a permeation suppressant and a softening agent, even if the amount of adhesion of the adhesive treatment agent composition containing the silicic anhydride colloid solution to polyester fibers or aromatic polyamide fibers is reduced, The adhesiveness between the fiber and the rubber is stable and excellent, and the treated base fabric is soft and the original strength of the fiber is maintained.

The base fabric material of the base fabric for a conveyor belt of the present invention includes rubber reinforcing fibers such as polyester fibers and aromatic polyamide fibers as warp threads, and rubber reinforcing fibers represented by aliphatic polyamide fibers as weft threads. And a woven fabric woven by a usual method is used.

Here, the polyester fiber used as the warp refers to a polyester fiber comprising a dicarboxylic acid and glycol having ethylene terephthalate as a main repeating unit. Specific examples of the dicarboxylic acid component include:
Examples include terephthalic acid, 2,6-naphthalenedicarboxylic acid, isophthalic acid, and 1,4-cyclohexanedicarboxylic acid. Further, specific examples of the glycol component include ethylene glycol, propylene glycol, tetramethylene glycol, 1,4-cyclohexanedimethanol, and the like. Part of the dicarboxylic acid component may be replaced with adipic acid, sebacic acid, dimer acid, sulfonic acid metal-substituted isophthalic acid, or the like, and part of the glycol component may be diethylene glycol, neopentyl glycol, 1,4 -Cyclohexanediol, 1,4-cyclohexanedimethanol, polyalkylene glycol and the like. Among these, polyethylene terephthalate in which 90 mol% or more of the dicarboxylic acid component is composed of terephthalic acid and 90 mol% or more of the glycol component is ethylene glycol, that is, the intrinsic viscosity is 0.7 or more in which ethylene terephthalate is the main repeating unit. Is most preferred.

The polyester fibers include particles such as various inorganic particles such as titanium oxide, silicon oxide, calcium carbonate, silicon nitride, clay, talc, kaolin and zirconate, crosslinked polymer particles, and various metal particles. In addition, conventionally known antioxidants, sequestering agents, ion exchange agents, coloring inhibitors, waxes, silicone oils, various surfactants, and the like may be added.

[0026] The polyester fiber used as the rubber reinforcing fiber preferably has a dry heat shrinkage of 160 ° C of 3% or less.

The aromatic polyamide fiber means a fiber made of a polymer in which repeating units in which aromatic rings are bonded by amide bonds account for at least 80% or more of the whole. Representative examples of aromatic polyamide fibers comprising these polymers or copolymers include polyparaphenylene terephthalamide fibers, polymetaphenylene terephthalamide fibers, and polyparaphenylene-3,4'-diphenylether terephthalamide fibers. Can be mentioned. The aramid fiber may also include the well-known additives described above.

Further, as a typical example of the aliphatic polyamide fiber used as the weft, nylon 66 fiber can be mentioned. Among them, at least 95 mol% of hexamethylene adipamide unit and sulfuric acid relative viscosity is 3.0. It is preferable to use the above nylon 66 fibers.

The base fabric for a conveyor belt of the present invention is preferably treated with an adhesive by a two-bath treatment method. In this case, the anhydrous silicate colloid solution is blended with the first treatment solution. Here, the two-bath treatment method is a method in which an adhesive treatment composition is applied to fibers in two stages.
Applying an adhesive treatment composition of the treatment liquid, followed by 70-
After drying at 150 ° C, heat-treating at 220-250 ° C,
Next, an adhesive treatment composition treatment liquid of the second treatment liquid is applied,
This is a method of performing drying and heat treatment similarly to the first treatment liquid.

As the first treatment liquid, a liquid mainly containing a mixture of a polyepoxide compound / blocked polyisocyanate compound / rubber latex and containing an anhydrous silicic acid colloid solution is preferably used. As the second treatment liquid, resorcinol / formaldehyde is used. A mixture of a precondensate of the above and a rubber latex (RFL) and an ethylene urea compound and / or a blocked polyisocyanate compound are preferably used.

The polyepoxide compound contained in the first treatment liquid is a compound containing two or more epoxy groups in one molecule. Specific examples of the polyepoxide compound include glycerol, pentaerythritol, sorbitol, ethylene glycol, polyethylene glycol,
Reaction products of polyhydric alcohols such as propylene glycol and polypropylene glycol with halogen-containing epoxides such as epichlorohydrin, resorcinol, bis (4-hydroxyphenyl) dimethylmethane, phenol-formaldehyde resin, and resorcinol-formaldehyde resin. Bis- (3,4-epoxy-), a reaction product of a phenol and a halogen-containing epoxide.
6-methyl-dicyclohexylmethyl) azibate,
Examples thereof include polyepoxide compounds obtained by oxidizing unsaturated bond portions such as 3,4-epoxycyclohexene epoxide. Among them, a reaction product of polyhydric alcohols and epichlorohydrin (polyglycidyl ether of polyhydric alcohol) is particularly preferable. Compound) is preferably used.

The blocked polyisocyanate compound optionally contained in the first processing liquid and the second processing liquid is one in which a blocking agent is released by heating to produce an active isocyanate compound. Examples thereof include polyisocyanate compounds such as tolylene diisocyanate, metaphenylene diisocyanate, diphenyl methane diisocyanate, hexamethylin diisocyanate, and triphenyl methane triisocyanate, and phenols such as phenol, cresol and resorcin; ε-caprolactam, valerolactam and the like. Lactams, acetoximes, methyl ethyl ketone oximes, oximes such as cyclohexane oximes, and reactants with blocking agents such as ethyleneimine, and the like.
Among these compounds, the use of an aromatic polyisocyanate compound blocked with ε-caprolactam and an aromatic compound of diphenylmethane diisocyanate are particularly preferred because they give good results. As the rubber latex contained in the first treatment liquid, it is preferable to use a vinyl pyridine / styrene / butadiene terpolymer rubber latex (VP latex).

Resorcinol contained in the second processing solution
The formaldehyde precondensate (RF) is obtained by condensing resorcinol and formaldehyde in the presence of an alkali catalyst or an acid catalyst, and the charged molar ratio of resorcinol to formaldehyde is 1: 0.7 to 1: 4. It is preferably in the range of 0, particularly 1: 1.0 to 1: 2.5. By setting the molar ratio in such a range, it is possible to simultaneously satisfy the adhesiveness with rubber and the prevention of the generation of sticky residue in the dipping step.

Further, as the resorcinol-formaldehyde initial condensate, it is preferable to use a novolak resin obtained by previously reacting dihydroxybenzene with formaldehyde in the absence of a catalyst or under an acidic catalyst. Specifically, this compound is, for example, resorcinol 1
A compound obtained by condensing 0.7 mol or less of formaldehyde with respect to the mol (for example, “Sumikanol 700” (registered trademark), manufactured by Sumitomo Chemical Co., Ltd.). When using this novolak-type condensate of resorcinol and formaldehyde, it is possible to adjust the molar ratio of resorcinol to formaldehyde to 1:10 to 1: 2.5 by dissolving in a water dispersion of an alkali catalyst and then adding formaldehyde. preferable. By using a novolak type resin, it becomes easy to obtain adhesiveness during wet heat vulcanization of raw steam or the like.

As the rubber latex contained in the second treatment liquid, it is preferable to select and use a latex that can ensure adhesion to rubber or an elastic resin used for the conveyor belt. Specific examples of the rubber latex used include chlorosulfonated polyethylene latex (CSM latex), chloroprene-based rubber latex (CR latex), acrylonitrile-butadiene-based copolymer rubber latex (NBR latex), and carboxyl-modified acrylonitrile-butadiene-based Copolymer rubber latex (NBR latex modified with carboxyl group),
Styrene-butadiene copolymer rubber latex (SBR
Latex), vinylpyridine-styrene-butadiene copolymer rubber latex (VP latex), polybutadiene latex (PB latex), butyl rubber latex (IIR latex), ethylene-propylene latex (EP latex), acrylate rubber latex, and natural rubber latex (NR latex), and these latexes can be used alone or as a blend of two or more.

In the second treatment liquid used in the present invention, the resorcinol-formaldehyde precondensate (R
A preferred range of the solid content weight ratio of F) to the rubber latex (L) is RF / L = 1/3 to 1/8. By setting the ratio of the resorcinol-formaldehyde precondensate within such a preferable range, the base fabric can be softened and the adhesion to rubber can be further improved.

The ethylene urea compound contained in the second treatment liquid is used to open the ethylene imine ring by heating to react and improve the adhesiveness. A typical example thereof is hexamethylene Aromatic and aliphatic isocyanates such as diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, and triphenylmethane triisocyanate, and reactive products of ethylene imine are mentioned. Particularly, aromatic ethylene urea compounds of diphenylmethane diethylene urea give good results. Therefore, it can be preferably used.

The addition amount of the colloidal solution of silicic anhydride is preferably 1 to 13 parts by weight based on 100 parts by weight of the adhesive matrix component contained in the first treatment liquid.
By setting the amount of the colloidal solution of silicic anhydride in this range, a base fabric for a conveyor belt having excellent flexibility, fatigue, and excellent adhesion to rubber can be obtained.

The amount of the adhesive treatment composition applied to the base fabric is, in the case of a base fabric having warp yarns of polyester fibers and weft yarns of aliphatic polyamide fibers, the dry weight of the first treatment liquid and the second treatment liquid together. The ratio (in terms of solid content) is optimally 2.0 to 4.0% by weight, preferably 2.5 to 3.5% by weight, based on the base fabric.

On the other hand, in the case of a base fabric using an aromatic polyamide fiber as a warp and an aliphatic polyamide fiber as a weft, similarly, the dry weight ratio (in terms of solid content) is 2.5 to 6.0 with respect to the base fabric.
%, Preferably 3.0 to 5.0% by weight.

By controlling the amount of adhesion of the adhesive treatment composition to the base fabric in the above range, a base fabric for a conveyor belt having low cost, excellent flexibility, excellent fatigue resistance and excellent adhesion to rubber can be obtained. can get.

[0042]

Next, the present invention will be specifically described with reference to examples. Each measurement value was obtained by the following method. (1) Peeling adhesion (rubber adhesion rate, peeling force) Two plies of base cloth are arranged in parallel in the warp direction, 1 mm of rubber is sandwiched between base cloths, and both sides of both base cloths are put in rubber. After embedding, press vulcanization is performed at 150 ° C. for 30 minutes under pressure. After cooling, both plies are measured for peeling at a pulling speed of 5 cm / min. The rubber adhesion rate is obtained by observing the base cloth peeled from the rubber with the naked eye and expressing the rubber adhering to the surface of the base cloth as a percentage, and the peeling force is the force required for peeling in kg / inch (N / Inch).
The rubber compound used for the peel adhesion evaluation was an unvulcanized rubber mainly composed of natural rubber. (2) Hardness Length of base fabric 4cm in warp direction, width (weft) 0.5cm
And put it on a bridge (2 cm interval, φ: 0.6 mm) of the Tensilon tensile tester, and hook a hook bar (φ: 0.6 mm) perpendicular to the base cloth on the center of the cord to descend (2c).
n / min), the maximum stress was determined, and the value was defined as the cord hardness. (3) Resin Adhesion Amount was determined by the absolute dry weight ratio after the adhesive treatment was applied to the raw fabric.

[Examples 1 to 4] First, colloidal solutions I to III of silicic anhydride having the concentration, PH, particle diameter, viscosity and specific gravity shown in Table 1 were prepared.

[0044]

[Table 1] In addition, 1000 denier (1100 d
tex) was used as the warp yarn and 1260 denier (1390 dtex) nylon 66 fiber was used as the weft to fabricate a double plain weave fabric under the conditions shown in Table 2 to produce a base fabric i.

[0045]

[Table 2] Furthermore, weaving a double plain weave under the conditions shown in Table 2 using an aromatic polyamide (Kevlar) fiber of 1000 denier (1100 dtex) for the warp and a nylon 66 weft of 1260 denier (1390 dtex) for the weft. As a result, a base cloth was manufactured.

On the other hand, the polyepoxide compound / blocked isocyanate / rubber latex was converted to a solid content of 8/18 /
100 parts by weight of a mixed solution mixed to be 74% by weight was added to a colloidal solution of silicic anhydride (I to III) described in Table 1.
Was added to the mixture, and the solid content of the mixed solution was adjusted to 6% by weight to prepare a first treatment liquid. In this case, sorbitol polyglycidyl ether was used as the polyepoxide compound, and 4,4 blocked with ε-caprolactam.
4'-diphenylmethane diisocyanate was used, and vinyl pyridine / styrene / butadiene copolymer latex was used as the rubber latex.

Also, resorcin formalin (R / F)
The molar ratio of 1 / 1.5, the solid content concentration is 10% by weight,
Aged for 4 hours under a commonly used alkaline catalyst, 14.3 parts by weight of this resorcinol-formalin precondensate (RF resin) was mixed with 80 parts by weight of a vinylpyridine / styrene / butadiene copolymer latex and
Butadiene latex (SBR latex) is added to 100 parts by weight of a mixed latex comprising 20 parts by weight,
Aged for 24 hours. This RFL solid content concentration is 20% by weight.
10 parts by weight of an aqueous dispersion of diphenylmethane-bis 4,4'-N, N'-diethylene urea was added to 100 parts by weight of this RFL, and the total solid concentration was 12% by weight.
Was prepared.

On the other hand, the woven fabrics I and B shown in Table 2 were each sized at 40 cm in the vertical direction (warp direction) × 30 cm in the horizontal direction (weft direction).
m was cut into small pieces to prepare a base cloth. This base cloth is first immersed in the first treatment liquid, excess adhesive is removed with a mangle, then the base cloth is set on a tenter metal frame (30 cm × 20 cm), and dried at 120 ° C. for 180 seconds in a drier. Followed by heat treatment at 235 ° C. for 60 seconds in the other dryer,
The base fabric was removed from the tenter frame.

Subsequently, the second processing solution was immersed, excess adhesive was removed with a mangle, and a tenter metal frame (30 cm ×
20cm), set the base cloth at 120 ° C with
It was dried for 0 second and subsequently heat-treated at 235 ° C. for 80 seconds in another dryer. Table 3 shows the results of evaluating the properties of the base fabric for a conveyor belt thus obtained. The flex fatigue properties of the belt were indicated by an index when the values of Comparative Examples 2 and 4 in which a colloidal solution of silicic anhydride described later was not added were set to 100.

[0050]

[Table 3]

[Comparative Examples 1 to 4] In the first treatment liquid, a colloidal solution of silicic anhydride was changed to bentonite (Comparative Examples 1 and 3), and a colloidal solution of silicic anhydride was not added (Comparative Examples 2 and 3). 4), the second treatment liquid was the same as in the example, and the treatment was performed on the base cloths A and B under the same treatment conditions as in the example. Table 4 shows the results of evaluating the properties of the base fabric for a conveyor belt obtained in this manner.

[0052]

[Table 4]

[0053]

As described above, the base fabric for a conveyor belt of the present invention can exhibit excellent adhesiveness to rubber even when the amount of the adhesive agent composition is reduced.
Moreover, it has excellent flexibility and fatigue resistance, and can provide a high-quality conveyor belt.

[Procedure amendment]

[Submission date] August 26, 1999 (1999.8.2
6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

[Title of the Invention] Base fabric for conveyor belt

Claims (11)

[Claims] 1. A base fabric for conveyor belts, wherein an adhesive treatment composition comprising a colloidal solution of silicic anhydride added to a woven fabric comprising rubber reinforcing fibers is provided. 2. The base fabric for a conveyor belt according to claim 1, wherein the particle size of the silicic anhydride is 50 μm or less. 3. The conveyor belt according to claim 1, wherein the addition amount of the silicic anhydride is 1 to 13 parts by weight based on 100 parts by weight of the adhesive matrix component in the adhesive treatment composition. Base cloth. 4. An adhesive matrix component in the adhesive treatment composition is a mixture of resorcin / formalin precondensate and rubber latex (RFL), a polyepoxide compound, a blocked isocyanate and / or an ethylene urea compound as a main active ingredient. The base fabric for a conveyor belt according to any one of claims 1 to 3, wherein 5. The warp comprising a rubber reinforcing fiber constituting the woven fabric is made of a polyester fiber having an intrinsic viscosity of 0.7 or more using ethylene terephthalate as a main repeating unit. The base fabric for a conveyor belt according to any one of the above. 6. The base fabric for a conveyor belt according to claim 5, wherein the fiber for reinforcing rubber has a dry heat shrinkage of 160 ° C. of 3% or less. 7. A weft comprising rubber reinforcing fibers constituting said woven fabric, comprising at least 95 mol% of hexamethylene adipamide units and a sulfuric acid relative viscosity of nylon 66 fiber of 3.0 or more. The base fabric for a conveyor belt according to claim 5 or 6, wherein 8. The conveyor belt according to claim 5, wherein the solid content of the adhesive treatment composition to the woven fabric is 2.0 to 4.0% by weight. Base cloth. 9. The base fabric for a conveyor belt according to claim 1, wherein the warp made of rubber reinforcing fibers constituting the woven fabric is made of an aromatic polyamide fiber. 10. A weft comprising rubber reinforcing fibers constituting said woven fabric, comprising at least 95 mol% of hexamethylene adipamide units and sulfuric acid relative viscosity of nylon 66 fiber of 3.0 or more. The base fabric for a conveyor belt according to claim 9, wherein 11. The base fabric for a conveyor belt according to claim 9, wherein the solid content of the adhesive treatment composition on the woven fabric is 2.5 to 6.0% by weight.