JPS59113043A - Material for conveyor belt - Google Patents

Abstract

PURPOSE:A material for a belt having low adhesion, capable of preventing adherent materials such as oil sand, etc. from attaching to it without applying an anti-block agent to it, obtained by blending rubber with a specific ratio of a specified organic fatty acid amide. CONSTITUTION:100pts.wt. natural or synthetic rubber is blended with 2-60 pts.wt., preferably 3-50pts.wt. 5-26C organic fatty acid amide (preferably 10- 20C organic fatty acid amide) (e.g., lauric acid amidestearic acid amide, oleic acid amide, etc.), preferably further 5-100pts.wt. alpha,beta-ethylenic unsaturated carboxylic acid [preferably (meth)acrylic acid], 3-150pts.wt. bivalent metallic compound (preferably zinc oxide), 0.2-20pts.wt. organic peroxide (e.g., dicumyl peroxide, etc.) and >=0.1pt.wt. aromatic secondary amine compound (e.g., N- isopropyl-N'-phenyl-p-phenylenediamine, etc.), to give the desired composition. EFFECT:Reduction in cost of transportation, prevention of fire, etc. are attained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a material for belts with low adhesion, and more particularly to a material for transportation belts intended to prevent various adhesive substances such as oil sand from adhering to the belt surface. Regarding.

Traditionally, transportation belts such as conveyor belts have had problems such as the objects being transported tend to adhere to their surfaces, resulting in the items being unable to be transported or requiring a large amount of cost and time to clean up afterward, such as peeling off the objects. It never stopped. Therefore, how to obtain a belt with low adhesion has been a long-standing problem in the transportation belt industry.

By the way, among these adherent transported substances, oil sant is extremely likely to adhere to the belt surface, and it has been almost impossible to prevent the oil sant from adhering to the belt surface by itself. Oil san 1-O is a clay-like material mainly composed of quartz sand containing heavy oil (bitumen), and is mined in open pits in Canada and other countries for the purpose of producing synthetic crude oil from this bitumen.

Therefore, as a countermeasure against this adhesion, conventional methods have been to apply kerosene, antifreeze, or an aqueous solution of a surfactant on top of the oil sand before placing it on the oil sand to prevent the oil sand from adhering to the surface and becoming a nuisance. These methods reduce transportation losses due to increased equipment and material costs.
If an amplifier is used and kerosene is used, there are problems such as increasing the risk of fire. For this reason, traditionally,
There has been a strong demand for the development of a rubber material for transportation belts that does not cause oil sand to adhere even without applying an anti-adhesion liquid such as kerosene.

In view of the above circumstances, the present inventors have carried out intensive research and have found that a material containing a specific organic fatty acid amide has an excellent adhesion prevention effect, and is particularly capable of effectively preventing oil sand adhesion. Therefore, it has been found that it is suitable as a material for belts for transporting sticky substances such as oil sands.

The present invention will be explained in detail below.

The belt material of the present invention is obtained by blending an organic fatty acid amide into a raw rubber composition and crosslinking the mixture.

The organic fatty acid amide used in the present invention has 5 to 5 carbon atoms.
26, preferably 7, or a fatty acid amide having 10 to 25 carbon atoms. Specifically, examples include caproic acid, lauric acid, palmitic acid, stearic acid, behenic acid, oleic acid,
Saturated and unsaturated fatty acid amides including erucic acid, cerotic acid, etc. These fatty acid amides may be used alone or in combination of two or more.

The blending amount of the above fatty acid amide is 100% of the rubber in the rubber composition.
It is preferably 2 to 60 parts by weight, particularly 3 to 50 parts by weight. When the amount of fatty acid amide is less than 2 parts by weight,
The peeling effect is small, and on the other hand, if it exceeds 60 parts by weight, it becomes very difficult to mix the fatty acid amide 1- and the rubber composition.
The comb physical properties of the resulting material are impaired.

There is no particular restriction on the type of raw material rubber into which the fatty acid amide is blended, and either natural rubber or synthetic rubber can be used. In this case, combs with relatively high polarity, such as acrylonitrile-phtadiene comb (NBR), urethane comb, etc., are used, such as natural combs (NR), which are relatively less polar than Hamoto.
, butane encom (BR), styrene-butane encom (SBR), ethylene-propylene encom l'=
(EPDM) etc. are also suitably used to improve the adhesion of adhesive substances. Note that one type of raw material com may be used alone, or two or more types may be used as friends.

In this way, the low-adhesive Bell 1 material is created by adding organic fatty acid amide to the raw material comb. However, by adding an α,β-ethylenically unsaturated carboxylic acid, a divalent metal compound, and an organic peroxide to this mixture, a belt material with even lower adhesion can be obtained. Here α, β
- Ethylenically unsaturated carboxylic acids include methacrylic acid, acrylic acid, ethacrylic acid, maleic acid, fumaric acid, etc., with methacrylic acid and acrylic acid being particularly preferred. Further, divalent metal compounds include oxides, hydroxides, and carbonates of zinc, magnesium, calcium, iron, etc., and zinc oxide is particularly excellent. On the other hand, organic peroxides include dicumyl peroxide (DOPO), 11-bis(t-butylperoxy)-8,8,5-) IJ cyclohexane (P-3M), and t-phthyl peroxide. , 25-dimethyl-25-di-t-phthylbaroxyhexane and the like are used. Preferred amounts of these compounds are 5 to 100 parts by weight of the α,β-ethylenically unsaturated carboxylic acid, 3 to 150 parts by weight of the divalent metal compound, and 02 to 20 parts by weight of the organic peroxide per 100 parts by weight of the comb.

By adding an aromatic secondary amine compound in addition to the above-mentioned additives, it is possible to improve the breaking properties required as a belt material. Aromatic secondary amine compounds include N-isopropyl-N'-phenyl-p-phenylenediamine, phenyl-α-naphthylamine, phenyl-β-naphthylamine, diphenyl-p-phenylenediamine, p-isopropyldiphenylamine, N,N
'-di-2-naphthyl-p-phenylene/amine are effective;
It is desirable to add at least part by weight.

In addition to the above-mentioned compounding composition, various compounding agents can be added to the belt material of the present invention as required. Examples of such compounding agents include carbon furanok, white carbon, calcium carbonate, magnesium carbonate,
Inorganic reinforcing agents or fillers such as diatomaceous earth and clay, polymethyl methacrylate (PMMA), polyvinyl chloride (PVO), vinyl chloride-vinyl acetate copolymer, organic powder fillers such as nylon, Teflon, and polyethylene, and cotton. , nylon, vinylon, strong human silk, steel cord and other fibers, amines, amine-artehyl-1 reactants, amine-kerne reactants, phenols, and other anti-aging agents.

The belt material of the present invention can be obtained by vulcanizing the above-mentioned composition using a suitable crosslinking agent or vulcanizing agent.

The transportation belt material of the present invention can be used to manufacture a belt body such as a conveyor belt, or can be formed as a cover to cover the belt, and the belt can be covered with the cover. . In any case, it is necessary that the surface of the transport belt is formed of the material for the bell 1- of the present invention, and the transport belt using the material for the bell 1- of the present invention contains a hydrocarbon-based viscous liquid, It is used to transport various adhesive substances, including semi-solid or solid substances (eg, bitumen, asphalt, etc.) and mixtures of these with inorganic or organic solids.

Since the material for transportation belts of the present invention contains fatty acid amide 1-, this fatty acid amide fleets onto the surface little by little and exhibits an anti-adhesion effect even at relatively low temperatures. Suitable for use as a material for transport belts such as sand.

As described above, a transport belt such as the conveyor belt 1-, which uses the transport belt material of the present invention, can prevent the adhesion of adhesive substances such as oil sand without having to apply a special anti-adhesive liquid such as kerosene each time. This reduces transportation costs, prevents fires, and facilitates maintenance.

Next, the present invention will be explained in more detail with reference to Examples.

Examples 1 to 5, Comparative Examples 1 to 2 ・Sheet-like vulcanizates of rut materials obtained with the compounding compositions shown in Table 1 (), OCmX 6CTLX
2cx) was attached to a belt adhesion measuring device described below, and the amount of oil sand adhesion at room temperature (20° C.) was measured. In all Examples and Comparative Examples, the adhesion is expressed as a relative adhesion amount - a relative adhesion amount when the adhesion of Comparative Example 1 is taken as 100, and the smaller this value is, the lower the adhesion is.

The following method was used to measure the relative adhesion amount.

An engine 1 as shown in Fig. 1: Samples 2 are attached by making incisions in several places on the belt 1, and a hopper 3 containing oil sand is provided above the belt, from which oil sand 4 is constantly fed. drop at a constant speed. As the heald rotates, the sample loaded with oil sand is carried to the press roll 5, where it is strongly pressed.

Note that the press roll can be adjusted with an appropriate amount of weight 6. This process is repeated for 30 minutes, and the amount of adhesion is determined by measuring the weight of the sample before and after reaching 1Ull.

In this measurement, the heald speed was 40 m/min, the oil sand falling speed was 35 g/min, and the oil sand was shipped directly from Canada.

In addition, the vulcanization conditions for each belt material are 155℃ for DOPO type.
, 80 minutes, 150°C for 80 minutes for the P-,9M system, and 145°C for 25 minutes for the sulfur series.

According to the measurement results in the lower column of Table 1, it can be seen that the adhesion is significantly reduced by the addition of erucic acid amide, regardless of the type of rubber.

Examples 6 to 8 The deposited amounts of the compositions shown in Table 2 were measured in the same manner as before, and the results are shown in the lower column of the same table.

It can be seen that the amount of adhesion is significantly reduced by the addition of various fatty acid amides.

From the above results, it is clear that the belt material of the present invention to which a specific amount of a specific fatty acid amide is added has the effect of significantly reducing the adhesion of oil sand.

[Brief explanation of the drawing]

The figure is a schematic diagram of a belt and an attached belt adhesion measurement device for measuring the adhesion of oil sand to a sample. l Endless Held 2 Sample 3 Hopper 4 Oil Sand 5 Press Roll 6 Weight Patent Applicant Frichistone Tire Co., Ltd. Representative Patent Attorney Akira Ito

Claims (1)

[Claims] A low-adhesive belt material containing 2 to 60 parts by weight of organic fatty acid amide having 5 to 26 carbon atoms per 100 parts by weight of comb.