JPS58198549A - Rubber composition - Google Patents

Abstract

PURPOSE:To provide a non-tacky rubber compsn. suitable for use in the transportation of tacky materials such as oil sand, by vulcanizing a rubber blend consisting of rubber, a specified non-tackifier, a vulcanizing agent and a filler. CONSTITUTION:0.5-20pts.wt. at least one non-tackifier selected from C6-C20 higher fatty amides such as stearamide and C6-C20 higher aliph. glycerides such as stearic acid triglceride, 0.1-10pts.wt. vulcanizing agent such as tetramethylthiuram disulfide and 10-200pts.wt. filler such as carbon black, are blended with 100pts.wt. at least one rubber selected from natural rubber, isoprene rubber, stylene/butadiene rubber and acrylonitrile/butadiene rubber to obtain a rubber blend, which is then vulcanized at 130-170 deg.C for 10-60min to obtain a rubber compsn. A conveyor belt for transporting tacky materials such as oil sand is made by using the rubber compsn. as the surface layer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rubber composition, in particular a rubber composition forming a non-tacky vulcanized rubber, and having a surface layer consisting of at least such a rubber composition, and thus particularly suitable for use in oil sands. The present invention relates to a conveyor belt that can be suitably used to convey highly sticky substances such as. Furthermore, the invention particularly relates to a method for conveying sticky substances such as oil sands by means of a belt having a surface layer of vulcanized rubber comprising a rubber composition as described above.

Oil sands are a petroleum resource that is particularly abundant in Canada and Venezuela, and Canada's Athabas oil sands are particularly famous because they have about 1/3 of the world's reserves. Take the Athahaska oil sands as an example.
This is formed by a thin water film covering fine silica sand grains, which is further surrounded by bitumen, and the water film also contains trace amounts of metals. Since this oil sand generally contains 5 to 20% heavy viscous bitumen, it is also extracted commercially as a petroleum resource. Collection methods include so-called open-pit mining and a method in which unnecessary components such as bitumen and silica sand are separated and collected underground.
At the Athabas force, open pit mining is carried out to remove overhardening from the oil sands and directly collect the oil sands.The collected oil sands are then transported by belt to an extraction and refining plant.

Conventionally, rubber belts made of a mixed rubber compound of natural rubber and styrene-nibutadiene rubber or acrylonitrile-butadiene rubber reinforced with steel cords have been used for healds for transporting oil sand, but oil sand tends to adhere and accumulate. In order to not only pollute the belt but also reduce its carrying capacity, conventionally, relatively inexpensive petroleum distillates such as kerosene and diesel oil have been sprayed onto the belt to prevent oil sand from adhering to it. This is transported to an extraction and purification plant.

However, this method poses a fire risk, accelerates the deterioration of the conveyor belt, and increases collection costs. Furthermore, with Athabas power, the temperature in winter is -50 degrees Celsius.
Since the temperature will continue to drop, the conveyor belt used here is required to have excellent low-temperature properties, especially flexibility at low temperatures.

Conventionally, it has been known that silicone raw rubber is blended and vulcanized in order to impart non-adhesive properties to organic rubber.
It is called c. ) by making the surface non-adhesive. Here, rc is a concept proposed by Zisman, and since there is a nearly linear relationship between the cosine of the contact angle θ of various liquids with respect to a certain polymer solid and the surface tension of those liquids, cos θ can be expressed as・It is a physical constant obtained by extrapolating it to 1.In terms of cylinders, it means the adhesion force between a polymer solid and a liquid, and it has a nearly proportional relationship with the cohesive energy of the solid.

Therefore, in general, if the rc is increased, the vulcanized rubber becomes thicker (it is expected that the adhesiveness of the vulcanized rubber will become thicker). The present invention was based on the discovery that it imparts remarkable non-adhesive properties.

In particular, as a result of extensive research on vulcanized rubber that has surface non-stick properties against oil sand, the inventors have found that by increasing the γC of vulcanized rubber to be larger than the γC of bitumen, the surface non-stick properties against bitumen can be improved. The present invention was based on the discovery that adhesive properties can be achieved.

That is, the present invention relates to a rubber composition that generally provides a non-tacky vulcanized rubber, and a surface non-tacky two-wheel conveyor having a surface layer consisting of a vulcanized rubber of the rubber composition. The object of the present invention is to provide a belt belt, and in particular to provide a conveyor hell 1 that can convey the viscous oil sand described above without substantially adhering it. A further object of the present invention is to provide a method for conveying viscous oil sand without substantially adhering it to the belt surface using a conveyor belt as described in 1- above.

The rubber composition according to the present invention comprises 100 parts by weight of natural rubber and/or organic synthetic rubber, and 0.00 parts by weight of at least one non-tackifying agent selected from fatty acid amides and fatty acid glycerides.
5 to 20 parts by weight.

Organic synthetic rubbers preferably used in the present invention include isoprene rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, butadiene rubber, and chloroprene rubber. These rubbers may be used alone, or may be a mixture of two or more. In particular, as the organic rubber, at least one selected from natural rubber, isoprene rubber, styrene-butadiene rubber, and acrylonitrile-butadiene rubber is preferred, and if necessary, butadiene rubber, chloroprene rubber, etc. are mixed therein.

The fatty acid amide used in the present invention has 6 to 30 carbon atoms.
In particular, 10 to 20 higher fatty acid amides are preferred, and the higher fatty acids may be saturated or unsaturated fatty acids.

Therefore, preferred fatty acid amides include stearic acid amide, oleic acid amide, palmitic acid amide, lauric acid amide, and the like.

In addition, fatty acid glyceride also has 6 to 30 carbon atoms as described above.
．． In particular, 10 to 20 higher fatty acid glycerides are preferred,
Therefore, preferred fatty acid triglycerides include stearic acid triglyceride, dihydroxystearic acid triglyceride, oleic acid triglyceride, palmitic acid triglyceride, and the like. However, in the present invention, mono- and diglycerides of higher fatty acids can also be used alone or together with triglycerides, if necessary.

In the present invention, the rubber set and sole are made of rubber 1 as described above.
065-2 as a non-tackifying agent using fatty acid amide and/or fatty acid glyceride as described above for 00M parts
It contains 0 parts by weight, preferably 1-10 parts by weight. When the amount of the non-tackifying agent is less than 0.5 parts by weight per 100 parts by weight of rubber, the vulcanized rubber has sufficient surface non-tackiness; -h, when it exceeds 20 parts by weight, the rubber This is not preferable since it becomes difficult to knead uniformly and the non-adhesive properties of the vulcanized rubber may bleed onto the surface.

The rubber composition in the present invention contains an appropriate vulcanizing agent depending on the organic rubber used. Organic rubber and L2 natural rubber,
When isoprene rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, butadiene rubber, etc. are used, they generally contain sulfur and/or a sulfur-containing compound as a vulcanizing agent. Any sulfur-containing compound may be used as long as it can vulcanize the organic rubber, but for example, tetramethylthiutim disulfide, tetraethylthiutim disulfide, and the like are preferably used. These vulcanizing agents are added in an amount of 1-10 parts by weight, preferably 1 to 5 parts by weight, per 100 parts by weight of the rubber mixture. Further, a vulcanization aid may be used in combination with the vulcanizing agent. As the vulcanization aid, those conventionally known for the above-mentioned organic rubbers can be used as appropriate.For example, as the vulcanization accelerator, diphenylguanidine, dicatechol, diorthotolylguanidine salt of fluoric acid, and 2-mercapto are used. ndzothiazole, dihenzothiazyl disulfite, N-
Cyclohexyl-2-benzothiazylsulfenamide, tetramethylthiuram monosulfide, etc., and metal oxides such as zinc white, magnesium oxide, litharge, etc., and fatty acids such as stearic acid and oleic acid as vulcanization accelerators. , amines such as triethanolamine and jetanolamine, and other activators such as diethylene glycol and triallyl trimellitate.

Further, when chloroprene rubber is used as the organic rubber, zinc oxide, magnesium oxide) is used as a vulcanizing agent, and an appropriate vulcanization accelerator is used in combination as necessary.

In addition to the above, the rubber composition of the present invention may contain various fillers commonly used in the above-mentioned self-produced rubber. For example, fillers include carbon black, silica, calcium carbonate, clay, magnesium carbonate, diatomaceous earth, various silicates, and organic fillers. When blending these fillers, di(2-ethylhexyl) phthalate, di(2-ethylhexyl) adipate, dibutyl phthalate, tri(2-ethylhexyl)
Plasticizers such as trimellitate and tricresyl phosphate, and softeners such as paraffinic process oil and aromatic process oil can be used in combination. Furthermore, phenyl-α-naphthylamine, N.

N1-diphenyl-p-phenylenediamine, 6-nitoxy2.2.4-1-tumethyl-1,2-dihydroquino I77, N-phenyl-N'-isopropyl-p-phenylenediamine, 2-mercaptobenzimidazole, dibutyl Antiaging agents such as nickel dithiocarbamate can also be used. If necessary, scorch inhibitors, processing aids, etc. may also be used in combination.

In order to produce the rubber composition according to the present invention, the above-mentioned components are usually kneaded using a Banbury mixer, a Nigoo mixer, a roll, or the like.

The rubber composition according to the invention is typically vulcanized by pressing at a temperature of 130-170°C for 10-60 minutes to give a vulcanized rubber.

The vulcanized rubber thus obtained has excellent non-adhesion to bitumen and can therefore be suitably used as a surface layer for conveyor belts for conveying oil sands containing bitumen.

Therefore, the conveyor belt according to the present invention comprises 10,011 parts of natural rubber and/or the organic synthetic rubber, 0.5 to 20 parts by weight of at least one non-tackifying agent selected from fatty acid amides and fatty acid glycerides, and vulcanized agent 0.1-1
It is characterized by having at least its surface layer a vulcanized rubber obtained by vulcanizing a rubber compound containing 0 parts by weight and 10 to 200 parts by weight of a filler.

1. The organic rubber for the conveyor belt is preferably at least one selected from natural rubber, isoprene rubber, styrene-butadiene rubber, and acrylonitrile-butadiene rubber, and as the filler, among the above-mentioned ones,
Carbon black is particularly preferred, and a conveyor belt that has at least a surface layer of vulcanized rubber obtained by vulcanizing a rubber composition containing carbon black, and is reinforced in its longitudinal direction with metal, organic fiber cord, canvas, etc. , not only has excellent non-adhesiveness against oil sand, but also oil resistance,
Because it has excellent flexibility and low-temperature properties, it can be used as a conveyor belt for transporting oil sand. In particular, the amount of carbon black suitable for oil sand conveyor belts is 20 parts by weight per 100 parts by weight of the above rubber mixture.
~150 parts by weight, preferably 30-100 parts by weight.

Accordingly, preferred oil sand conveyor belts according to the invention include natural rubber, isoprene rubber, styrene rubber, etc.
100 parts by weight of at least 12 types of in-house rubber selected from butadiene rubber, diene rubber, and acrylonitrile-butadiene rubber, and at least 1 part by weight selected from fatty acid amide and fatty acid glyceride! 0.5 to 20 parts by weight of a non-tackifying agent and sulfur and/or a vulcanizing agent.
or sulfur-containing organic compound" and 20 to 150 parts by weight of carbon black as a filler. In particular, as an organic rubber, acrylonitrile containing 15 to 2
Acrylonitrile-butadiene rubber in the range of 5% is preferably used because it has an excellent balance between cold resistance and oil resistance.

However, it goes without saying that the above rubber compound may contain butadiene rubber, chloroprene rubber, etc., a vulcanizing agent, a vulcanization accelerator, or other fillers therefor.

The method of manufacturing a conveyor belt is already well known in general, and includes a vulcanized rubber formed by vulcanizing a rubber compound as shown below as at least its surface layer, and a reinforcing cord such as steel cord or organic fiber 3. Conveyor belts having fiber cords or canvas or the like as reinforcement in the longitudinal direction are substantially non-adhesive to viscous oil sands.

Therefore, according to the present invention, there is also provided a method for transporting collected oil sands to a predetermined extraction and purification plant, which method comprises: natural rubber and/or the above-mentioned organic synthetic rubber;
100 parts by weight of at least IN organic rubber preferably selected from natural rubber, isoprene rubber, styrene-butadiene rubber and acrylonitrile-butadiene rubber, and 0.5 to 2 Oi of at least one non-tackifying agent selected from fatty acid amides and fatty acid glycerides. 1 to 5 parts by weight of sulfur or a sulfur-containing organic compound as a vulcanizing agent,
The oil sand is conveyed by a conveyor belt having at least its surface layer a vulcanized rubber made by vulcanizing a rubber compound containing 20 to +50 parts of carbon black as a filler.

Therefore, according to this method, the belt can be transported from the mining point to the extraction and refining plant without spraying melted oil or the like on the belt surface and without substantially adhering the oil sand to the belt surface as in the conventional method. ! It can be transported. However, since the conveyor heald of the present invention has excellent oil resistance, there is no problem in spraying melted oil or the like on its surface as necessary.

Examples of the present invention are listed below, but the present invention is not limited to these Examples. In the following, parts refer to parts by weight.

Examples of the present invention are listed below, but the present invention is not limited to these Examples. In addition, in hedo, the part indicates the overlapping part.

Example 1 The following formulation: Acrylonitrile-butadiene rubber (N250S manufactured by Nihon Gosei Rubber) 100 parts Oleylamide 2 Carbon black
50 zinc white
5 Sulfur 2 Vulcanization accelerator 1.25 Stearic acid 1 Processing aid
3 Anti-aging agent
3 from 80 to 100't! The mixture was uniformly kneaded using two rolls at a temperature of 100 ml, and then rolled using rolls to obtain a sheet with a thickness of 211 mm. The thus obtained sheet had a γC of 43 dyne 7 cm and an asphalt peeling force of 50 g/cm width.

Note that the bitumen has an rc of 32 dyne 7 cm, and for comparison, sheets were similarly prepared from the same rubber formulation as above, ie, a conventional acrylonitrile-butadiene rubber formulation, but without oleylamide. The rc of this seat is 36 dyne.
7 cm, and the asphalt peeling force was 180 g/■ width.

The method for measuring yc is as follows. Using glycerin, formamide, diodiglycol, ethylene glycol, and polyethylene glycol (average molecular weight 200) as liquids with known surface tensions, the contact angle of 0 with vulcanized rubber was measured at a temperature of 25°C. Then, extrapolate CO3θ to 1 and get r
I found c. The method for measuring asphalt peeling force is as follows. Thickness 0.08 fi on double-sided paper 11
Asphalt with a density of 200 was impregnated under pressure at a rate of 0.01 g/cJ, and the width was 1 cI11. The above sheet cut to a length of 1OcII+ was pressed at a temperature of 25°C for 10 seconds under a pressure of 3kg/c+J, and then peeled at a peeling rate of 50 fins/min to 180 fins/min.
°Peel force was measured.

Example 2 A sheet was obtained in exactly the same manner as in Example 1, except that 2 parts of stearic acid triglyceride was used in place of oleylamide. The γC of this sheet is 40 d
yne /, cs, and asphalt peeling force is 90g
/e11 width.

Patent Applicant Band-Kasho Co., Ltd. Representative Patent Attorney Makino Itsube 7 Ding-VC? ! Original document (method) September 1980 and November 11, 1983, Commissioner of the Japan Patent Office, 1, Indication of the case, 1982 Patent Application No. 082797, 2, Name of the invention: Rubber composition 3, Relationship with the case that confirms wA Patent application Address: 11131-112-15 Meiwa, Hyogo-ku, Kobe Name: Band-Kagaku Co., Ltd. 4, Agent Address: 1 Shinmachi, Nishi-ku, Osaka 'T' 8-3-5
, the date of the amendment order: August 131, 1982. Also, submit the application and specification (with no changes in content).

Claims (1)

[Scope of Claims] ill Contains 100 parts by weight of natural rubber and/or organic synthetic rubber, and 0.5 to 20 parts by weight of at least one non-tackifying agent selected from fatty acid amides and fatty acid glycerides. A rubber composition characterized by: (2) 100 parts by weight of natural rubber and/or organic synthetic rubber, 0.5 to 20 parts by weight of at least one non-tackifying agent selected from fatty acid amides and fatty acid glycerides, and 0.5 parts by weight of a vulcanizing agent. 1 to 10 parts by weight and 10 to 200 parts by weight of filler
A conveyor belt for transporting oil sand, characterized in that it has at least a surface layer of vulcanized rubber obtained by vulcanizing a rubber compound containing parts by weight. (3) 100 parts by weight of at least one organic rubber selected from natural rubber, isoprene rubber, styrene-butadiene rubber, and acrylonitrile-butadiene rubber, and 0.5 liters of at least one non-tackifying agent selected from fatty acid amides and fatty acid glycerides. -20Jii parts,
Sulfur or sulfur-containing organic compound 0.1 to 1 as a vulcanizing agent
0 parts by weight and 10 to 20 parts of carbon black as a filler.
A conveyor held for transporting oil sand according to claim 2, characterized in that the conveyor held for oil sand transportation has at least a surface layer of a vulcanized rubber obtained by vulcanizing a rubber compound containing 0 parts by weight.