JPH10264269A - Conveyer belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To firmly bond polyolefin to fiber by treating a resin layer constituting a conveyer belt with an adhesive agent composed of acid anhydride copolymer polyolefin, and fiber canvas with adhesive composed of polyamide resin. SOLUTION: A resin layer 2 of a conveyer belt 3 is composed of acid anhydride copolymer polyolefin, where acid anhydride can be, for example, maleic anhydride, phthalic anhydride, or succinic anhydride, and polyolefin can be, for example, polyethylene, polypropylene, or the like. Canvas 1 of the conveyer belt 3 is composed of fiber, and treated with adhesive composed of polyamide resin. The fiber canvas 1 can be composed of, for example, polyethylene terephthalate, nylon 6, cotton, rayon, or the like. The adhesive composed of polyamide resin is preferably composed of main component of polyamide resin, and added epoxy resin and/or polyisocyanate compound, or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a conveyor belt formed by laminating a resin layer and a fiber canvas.

[0002]

2. Description of the Related Art Conveyor belts are widely used for conveying articles, such as foods, processed foods, processed materials, tools and members, and wastes.
Since such a conveyor belt requires durability, abrasion resistance, and the like, it is configured by laminating a resin layer made of resin and a fiber canvas made of fibers.

Conventionally, natural rubber, styrene-butadiene copolymer rubber, and the like have been used as a resin for such a resin layer, but the performance must be adjusted by blending a large number of kinds and a large amount of additives. In some cases, these additives are liable to elute from the surface of the conveyor belt and contaminate the conveyed goods or contaminate foods.

[0004] Therefore, as a conveyor belt used for conveying foods and the like, mainly from the viewpoint of hygiene,
BACKGROUND ART Resin conveyor belts and the like having a surface layer of a resin such as polyurethane, polyvinyl chloride, ethylene-vinyl acetate copolymer, and ethylene-acrylic acid copolymer are widely used.
However, when these resins are used, hydrolysis or deterioration occurs during use, and there is a disadvantage that the deteriorated product is transferred to foods and the like.

[0005] On the other hand, polyolefins such as polyethylene and polypropylene are known to have excellent environmental stability and have no such disadvantages. However, polyolefin is a material that is difficult to adhere to, and has a drawback that it is difficult to adhere to canvas, which is necessary when used as a resin layer of a conveyor belt.

[0006]

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a conveyor belt comprising a resin layer made of polyolefin and a fiber canvas by firmly bonding a polyolefin and a fiber. It is assumed that.

[0007]

The present invention relates to a conveyor belt comprising a resin layer and a fiber canvas laminated, wherein the resin layer is made of an acid anhydride copolymerized polyolefin, Is a conveyor belt that has been treated with an adhesive made of a polyamide resin. Hereinafter, the present invention will be described in detail.

[0008] The resin layer of the conveyor belt of the present invention comprises an acid anhydride copolymerized polyolefin. The acid anhydride copolymerized polyolefin is obtained by copolymerizing an acid anhydride with a polyolefin. The acid anhydride is not particularly limited, and examples thereof include maleic anhydride, phthalic anhydride, and succinic anhydride. The polyolefin is not particularly limited, and examples thereof include polyethylene and polypropylene. More specifically, as the acid anhydride copolymerized polyolefin, for example, A
DMER (manufactured by Mitsui Petrochemical Industries, Ltd.), MODIC (manufactured by Mitsubishi Chemical Corporation) and the like can be mentioned.

The canvas of the conveyor belt of the present invention is made of fiber and is treated with an adhesive made of polyamide resin. Examples of the fiber canvas include those made of fibers such as polyethylene terephthalate, nylon 6, cotton, and rayon. The polyamide resin is a thermoplastic resin having an amide bond in a molecule generated by a condensation reaction between a dicarboxylic acid and a diamine. Among them, a solvent / water-solubilized polyamide resin is preferable because the canvas can be easily treated.
As the solvent / water solubilized polyamide resin, for example,
Examples thereof include N-methylol, N-alkoxymethylated, and mercaptanized polyamide resins and nylons formed from dimer acid and diamine.

Examples of the adhesive made of the above polyamide resin include those containing the above polyamide resin as a main component and preferably containing an epoxy resin and / or a polyisocyanate compound. As the epoxy resin, those having two or more glycidyl ether groups in the molecule are preferable. For example, bisphenol-based epoxy resin, glycerin-type epoxy resin, novolak-type epoxy resin, alicyclic epoxy resin, polyolefin-type epoxy resin, epoxy And soybean oil. As the polyisocyanate compound, those having two or more isocyanate groups in the molecule are preferable, for example,
Chlorophenylene diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate and the like can be mentioned.

The conveyor belt of the present invention can be manufactured, for example, as follows. The fiber canvas is impregnated or coated with the adhesive by previously dipping or coating the fiber canvas in a solution or melted adhesive. Then, to dry and react the adhesive, if necessary, at a temperature of 50 to 150 ° C. for several minutes to
Heat for tens of minutes. Thereafter, the fiber canvas treated with the adhesive and the molten acid anhydride copolymerized polyolefin are laminated.

[0012] The conveyor belt of the present invention has high durability, is hygienically safe, and has extremely little adhered residue of the conveyed material. Therefore, the conveyor belt of the present invention can be suitably used as a conveyor belt for conveying foods and the like.

[0013]

The present invention will be described in more detail with reference to examples of the present invention, but the present invention is not limited to these examples.

Examples 1 to 4 and Comparative Examples 1 to 5 Polyethylene terephthalate fiber canvas was immersed in the adhesive shown in Table 1 and then heated at 150 ° C. for 3 minutes. Thereafter, the resin shown in Table 2 was laminated on the bonded fiber canvas using an extruder to produce a conveyor belt shown in FIG.

The conveyor belts of Examples 1 to 4 and Comparative Examples 1 to 5 were evaluated as follows. (1) Peeling adhesive strength A test piece having a width of 25 mm and a length of 150 mm was prepared.
The peel adhesion between the resin and the fiber canvas was measured under the following temperature conditions. (2) Belt running test A test belt having a width of 50 mm was prepared, and a belt running test was performed at a running speed of 200 m / min using a 50 mmφ driving pulley, a 50 mmφ driven pulley, and a 1 m center-to-shaft testing device, and the belt was driven to start peeling. The number of pulley bending times was calculated based on the time. Table 3 shows the results.

[0016]

[Table 1]

[0017]

[Table 2]

In Tables 1 and 2, 1) is a dimer acid polyamide resin (manufactured by Henkel Japan), 2) is an epoxy resin (manufactured by Yuka Shell Epoxy), and 3) is an imidazole compound (manufactured by San Apro). 4) represents an acid anhydride copolymerized LLDPE-based polyolefin (manufactured by Mitsui Petrochemical Industries, Ltd.), and 5) represents an ethylene-octene copolymer-based polyolefin (manufactured by Dow Chemical Company).

[0019]

[Table 3]

[0020]

As described above, the conveyor belt of the present invention has high durability, is sanitary safe, and has very little adhered residue of the conveyed material. The conveyor belt of the present invention can be suitably used as a conveyor belt for conveying foods and the like.

[Brief description of the drawings]

FIG. 1 is a schematic view of a cross-sectional structure of a conveyor belt of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Textile canvas 2 Resin layer 3 Conveyor belt

Claims (1)

[Claims] 1. A conveyor belt formed by laminating a resin layer and a fiber canvas, wherein the resin layer is made of an acid anhydride copolymerized polyolefin, and the fiber canvas is made of an adhesive made of a polyamide resin. A conveyor belt, characterized in that the conveyor belt has been processed by the following.