JPS5978004A - Nonviscous steel cord conveyor belt - Google Patents

Abstract

PURPOSE:To make the characteristic of strength or the like and nonstickness to a surface securable in an economic way, by installing an intermediate layer where peroxide and sulfur are unimpeded with each other, in space between a steel inner core layer and a silicone rubber skin layer, while making it stick to these layers by means of vulcanization. CONSTITUTION:Silicone rubber on a skin layer vulcanizes peroxide, while steel cord adhering rubber on an inner core layer is vulcanized. Single or mixed spun nylon, polyester, vinilon, cotton and so on are used as canvass which turns to an intermediate layer of these rubber parts. When treatment takes place, it is proper to do it with a resorcinol formalin latex process, and this latex is required to contain vinylpyridine latex at a rate of more than 80% in the total amount of latex. In a treatment process, the latex is baked for five minutes long at a temperature of 15 deg.C. As a result, adhesive strength grows large so that a relatively inexpensive conveyor belt which partakes both of the strength characteristic required for a conveyor belt and nonstickness to sticky substances including oil sand, etc., can be thus secured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conveyor belt for adhesive materials such as oil sands.

This type of conveyor belt must have sufficient strength and flexibility under the annual climatic conditions because it is transported over a long distance from the oil nand extraction point to the picumen separation treatment point. Since then, steel cord conveyor belts have been used. However, conveyor belts made of general-purpose rubber that adheres well to Steelco F do not have the same adhesion properties, so oil sand accumulates during operation and can accumulate to a thickness of A inch (12.7M) or more. This deposit causes load imbalance and overload on the belt, and also accelerates wear such as jitter.

Conventionally, the non-adhesion between the belt and the oil sand has been maintained by spraying kerosene, light oil, etc. on the surface of the conveyor belt for oil sand. However, because it was necessary to stop spraying oil from a fire safety standpoint, it became necessary to use other methods to prevent oil sand from adhering. Make the conveyor belt itself non-stick #'i
Although this is one solution, a conveyor belt that is non-adhesive to oil sand is not yet known.

In order to make the surface inviscid, the solubility parameter index (S
It is known that silicon and Teflon, which have a low critical surface tension (γC), are effective.

However, it is not possible to use silicone rubber as it is to roll a steel cord conveyor belt, but silicone rubber does not adhere to the steel cord, has mechanical strength problems, and is expensive, so it is not economically viable to use silicone rubber. Steel cord conveyor belts are still unknown.

Accordingly, it is an object of the present invention to economically obtain a conveyor belt that is non-adhesive to adhesive substances such as oil sand and does not require the use of an oil-based detergent.

Another object of the present invention is to obtain a conveyor belt that has the required properties such as strength as a conveyor belt and has a surface that is free from I+J adhesion.

Another object of the present invention is to obtain a conveyor belt having an inner core layer of a steel cord conveyor belt using a general-purpose comb that has good adhesion to steel cords, and a surface layer of non-adhesive silicone rubber surface cover rubber. do.

silicone rubber and general-purpose rubber natural comb (NR rubber),
Polystyrene butadiene copolymer rubber (SBR rubber),
Vulcanization bonding of MK with polybutadiene rubber (BR rubber), polyacrylonitrile getadiene copolymer rubber (NBR com), polyethylene propylene copolymer rubber (EPM rubber), and blends thereof is still largely unknown. . Regarding this point, the vulcanization adhesion between the internal reaction layer of Kihatsu Fg'11d general-purpose rubber steel cord belt and the silicone rubber skin layer -
The object of the present invention is to obtain a conveyor belt that enables integral connection.

According to the present invention, these thin objects are achieved by interposing an intermediate layer between the skin layer and the inner core layer, which does not interfere with either the side vulcanized rubber or the sulfur vulcanized rubber, and vulcanize and bond them together to convey the material to the destination conveyor. Solved by giving a belt. This is a canvas coated with such an intermediate layer material, particularly a canvas coated with resorcin formalin latex treatment (RFL treatment). Others include various rubber elastomers, particularly polyethylene propylene diene 8-component copolymer rubber (EPDM-If), which can be peroxide-vulcanized or sulfur-vulcanized. Even better results can be obtained by using these in combination with polyethylene brobylene copolymer rubber (EPM rubber) and f-type silicone and ethylene propylene copolymer rubber (SEP rubber).

Hereinafter, the present invention will be specifically and detailedly explained using examples and numerical values.

Silicone rubber is vulcanized with oxide, and rubber for bonding steel cords is vulcanized with sulfur. The two do not adhere to each other. Even if a #F-refined blend of the two is used as an intermediate to bond them together, they still do not bond. The adhesive strength between the silicone rubber and this intermediate layer is H1-8 #ψ, and the adhesive strength between this intermediate layer and the steel cord adhesive rubber is 8-5.
It is only about 7. This is because the presence of sulfur during peroxide vulcanization inhibits vulcanization in the case of silicone rubber. It is an object of the present invention to eliminate the A compatibility between the two. The implementation conditions are as follows.

Test Materials (1) Canvas The canvas used in the present invention may be made of nylon, polyester, vinylon, cotton, etc. alone or in a blend. The canvas structure is 800 to 20,000 denier in the warp and 800 to 20,000 denier in the width, and the number of strands is 10 to 100 in the vertical direction and 10 to 100 in the horizontal direction per 5 cm.

For the treatment of the canvas, resorcin 7 forpurin latex treatment (RFL treatment) is suitable for fib b, and the latex preferably contains vinyl pyridine (VF') latex at least 80% of the total latex. Sample material I
For A+, vertical nylon, horizontal nylon, vertical 12
60 denier 1 strand, width 1260 denier 10 wood strands, number of strands vertically 5 cwt (80 denier between, 5 strands horizontally)
There were 15 trees between cm.

The composition of PFI-treatment was resorcinol 1.8%, 87%7
Ormaline 1.9%, Na01f O, 05%, 40%
Vinyl pyridine latex is 28% and water is 68.75%. Processing is done at a temperature of 150°C and baked for 6 minutes. 90 (b) Silicone Rubber Silicone rubber has a rubber content of 80% or more. The sample material (B) was Toshi silicone 5H86.
For 1U100, Nippon Oil Co., Ltd.'s Permil D-40 (Jigumi 71/) 40%) was used as a vulcanizing agent.
Natural rubber (NR) with the following composition was used as the sample material (C) for adhesion of steel cord. Zinc oxide) 10 Stearic acid (S, A,) Lusorcin 4Hexamethylenetetramine 2.8+1ia
r: RitB Agent CZ (N-Sil 1)~Y-Sil 2-Penzogbujilless I+/Zenamide) 1.2 Carbon black 86 Silica 80 Softener
10 pine resin
6 Lizard 2 Sulfur
2 (d) Polyethylene propylene diene 8-component copolymer rubber (EPDM rubber) EP9 using the following composition as the test material (]))
8 (Japanese synthetic rubber) 100 capo:/HAF 50 oil (
Naphthenic) 20 ZnO (zinc oxide) 5 Stearic acid (S, A,) 1 Vulcanization accelerator TMTM (tetramethylthiclam monosulfide) 1.6 Vulcanization accelerator MBT (2-mercabutopenzozazole)
0,5 sulfur
1.5(e) Polyethylene propylene copolymer rubber (EPM rubber) FPII using the following composition as the test material (E)
(Made by Japan Synthetic Rubber) 100 Carbon HA
F 60 oil (paraffinic) 10-kumil 11
40 (40%) 3 Ethylene dimethacrylate (EPMA) 8.8 (f) Modified silicone and ethylene propylene copolymer blend rubber (SEr' rubber) Test 11 S with the following composition was used as (F)
F P 171 U (411 Etsu Chemical)
t O (1 perc mill D40
8 Anti-aging d 2 agents M) 1 (2-Mercaptopenezimigsol) Silicone rubber 7 Steel cord adhesive rubber (1) B −C(S i/'sT
) Present invention example (II) B-A-C(S i/
IK cloth/ST) Wood'lrJ example (IV) B-r-
E-p-c (5''"" product electric;,) width 4Qm, length 1
80 bars, 2 thick rubber sheet, width 40m, length 1
After making a canvas of 80 mm and forming a composite structure of the above combination, this composite was subjected to a heating process Qτ(
Sores vulcanized. Press pressure is 50 kq/, 4,
Cut into 1 inch (25.4 m) width rFtt for adhesive strength measurement.
't.

The results of measuring the peeling force between each layer when a 1 inch width measurement sample of lumber was prepared as described above and removed at an IPJ peeling speed of io OM/min are as follows. That's right.

Comparative example (I) 1 to 8 hq (between B and C) Invention example (Ill 12 to 15 to '7 (B A17
i1), 15-20#q, (between A-C) Invention example (1
) 12~xekq (between B-9), 15~2ohq (
Between FE-E), 25-801?9CE-A), 15-2
01? (Between A and C) Tree J3FJ [(IVI 12~
+ehq, (B-FfflD, t5~2o#q(F-
EFI), 20~2tyk (K-D), 16~
20hg (between D and C) As shown in Comparative Example (1), by simply combining silicone rubber (Si) steel coat)' 4e, N'j' rubber (ST) without relying on the present invention. d The adhesive force is small and there is virtually no adhesion. On the other hand, examples of the present invention (such as m) in which only canvas is interposed as an intermediate layer, and example (1) of the present invention in which canvas is interposed as an intermediate layer on the steel cord adhesive rubber (ST) side, and canvas and silicone rubber are used as the intermediate layer. (Sl) and 81M rubber vulcanized with Nove oxide between 9 and 9.
EPDM rubber, which can be peroxidized F vulcanization and sulfur vulcanization as in Example (5) of the present invention, with SEP rubber interposed therein, is used on the steel bonding comb (ST) side.
Rubber and silicone rubber (81),! : When SEP rubber is interposed between E)'M and SEP rubber, the adhesive strength is very large, and as a result, it has the strength itN required for conveyor pellets.
It is possible to obtain a relatively inexpensive competition V pellet that has both characteristics and adhesion resistance to sticky substances such as oil sand.

The present invention can also be implemented with various changes within the scope of the invention, and the combination and order of materials used are not limited to the eight examples of the present invention described above.

That is, when using canvas, in addition to the combination of the present invention example (St/canvas/ST using canvas alone in m), canvas K EfM
In the example (II) of the present invention, Si/SEP/
Unlike the combination of KPM/canvas/ST, a combination of Sl/PJ'M/canvas/ST may be used, in which SEP is omitted.

Also, steel cord adhesive rubber (SI) IQKEPDM
When using S + / SEP / of the steel surface of the present invention
In addition to the EPM/EF'lL+/ST combination, SI
/EI'M/EPDM/ST, 81/EPDM/ST
, may be a combination of St/SEP/EPDM/ST. Of course, changes in the composition and composition of each material, as well as changes in processing conditions within the range of known technology, are also possible at Kibatsu I! Included within the 11 range. Materials to be transported (oil sand) by putting canvas
The role of preventing cracks caused by impact is fulfilled.

Patent applicant agent name : 1 Patent Attorney Kado 1) Yoshihiro Yama

Claims (1)

[Claims] (1) Silicone rubber is used for the skin layer, steel cord and steel cord adhesive rubber are used for the inner core layer, and both layers are made of peroxidite vulcanized rubber and sulfur vulcanized rubber. A non-adhesive steel cord conveyor belt characterized by having an intermediate layer made of a non-stick material. (21) The non-adhesive steel cord conveyor belt according to claim 1, characterized in that the silicone rubber has a rubber content of 80% or more. (3) The steel cord bonding rubber is natural. Rubber (NR rubber), polystyrene polymer rubber (SBR rubber), polybutadiene rubber (BR rubber) alone or their combined products account for 80% or more of the total polymer content, and the rubber content is 80% of the total. % or more of the non-adhesive steel cord conveyor belt according to any one of claims 1 and 2. (4) A canvas is used as the intermediate layer. A non-adhesive steel cord conveyor belt according to any one of claims 1, 2 and 8, characterized in that it is used as a latex T, I vinyl The non-adhesive steel cord conveyor belt according to claim 4, characterized in that pyridine latex (VP) accounts for 80% or more of the total latex. A feature characterized in that a polyethylene globylene diene 8-component copolymer rubber (EPDM rubber) layer is interposed on the side of the core layer. The non-adhesive steel cord conveyor belt described in "7) The intermediate layer is a polyethylene propylene copolymer rubber (E
The non-adhesive steel cord conveyor belt according to claim 7, characterized in that Pλ (rubber) and/or modified silicone and ethylene propylene copolymer blend rubber (SEP rubber) are used together. j31 KEP between the canvas and the epidermal layer as the intermediate layer
A steel cord conveyor belt according to any one of claims 4, 5 and 6, characterized in that the steel cord conveyor belt has a 40 mm rubber straddle and an EPM rubber and a SEP rubber interposed therebetween.