CN115746414A - Rubber composition for covering rubber of air suspension type conveying belt - Google Patents
Rubber composition for covering rubber of air suspension type conveying belt Download PDFInfo
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- CN115746414A CN115746414A CN202210857267.7A CN202210857267A CN115746414A CN 115746414 A CN115746414 A CN 115746414A CN 202210857267 A CN202210857267 A CN 202210857267A CN 115746414 A CN115746414 A CN 115746414A
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 201
- 239000005060 rubber Substances 0.000 title claims abstract description 201
- 239000000203 mixture Substances 0.000 title claims abstract description 94
- 239000000725 suspension Substances 0.000 title claims abstract description 30
- 239000006229 carbon black Substances 0.000 claims abstract description 57
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229920003048 styrene butadiene rubber Polymers 0.000 claims abstract description 25
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 21
- 229920003052 natural elastomer Polymers 0.000 claims abstract description 21
- 229920001194 natural rubber Polymers 0.000 claims abstract description 21
- 239000012188 paraffin wax Substances 0.000 claims description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 23
- -1 polyethylene Polymers 0.000 claims description 18
- 239000004698 Polyethylene Substances 0.000 claims description 17
- 229920000573 polyethylene Polymers 0.000 claims description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 238000001179 sorption measurement Methods 0.000 claims description 11
- 239000002904 solvent Substances 0.000 claims 1
- 230000032683 aging Effects 0.000 abstract description 28
- 239000010410 layer Substances 0.000 description 95
- 235000019241 carbon black Nutrition 0.000 description 48
- 230000000694 effects Effects 0.000 description 28
- 238000012360 testing method Methods 0.000 description 26
- 239000003921 oil Substances 0.000 description 21
- 239000005062 Polybutadiene Substances 0.000 description 18
- 229920002857 polybutadiene Polymers 0.000 description 18
- 230000003014 reinforcing effect Effects 0.000 description 17
- 238000004073 vulcanization Methods 0.000 description 16
- 238000011156 evaluation Methods 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 239000004636 vulcanized rubber Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 239000010692 aromatic oil Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 7
- 239000003063 flame retardant Substances 0.000 description 6
- 238000013101 initial test Methods 0.000 description 6
- 238000005339 levitation Methods 0.000 description 6
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 239000000654 additive Substances 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- 229920000459 Nitrile rubber Polymers 0.000 description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000006238 High Abrasion Furnace Substances 0.000 description 3
- 239000006242 Semi-Reinforcing Furnace Substances 0.000 description 3
- 239000002174 Styrene-butadiene Substances 0.000 description 3
- 239000006236 Super Abrasion Furnace Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 229920003244 diene elastomer Polymers 0.000 description 3
- 238000005227 gel permeation chromatography Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 description 2
- 239000006240 Fast Extruding Furnace Substances 0.000 description 2
- 239000006243 Fine Thermal Substances 0.000 description 2
- 239000006244 Medium Thermal Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 229920005549 butyl rubber Polymers 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000003480 eluent Substances 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 229920003049 isoprene rubber Polymers 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002480 mineral oil Substances 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 229920001084 poly(chloroprene) Polymers 0.000 description 2
- 239000010734 process oil Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004705 High-molecular-weight polyethylene Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- GXBMIBRIOWHPDT-UHFFFAOYSA-N Vasopressin Natural products N1C(=O)C(CC=2C=C(O)C=CC=2)NC(=O)C(N)CSSCC(C(=O)N2C(CCC2)C(=O)NC(CCCN=C(N)N)C(=O)NCC(N)=O)NC(=O)C(CC(N)=O)NC(=O)C(CCC(N)=O)NC(=O)C1CC1=CC=CC=C1 GXBMIBRIOWHPDT-UHFFFAOYSA-N 0.000 description 1
- 102000002852 Vasopressins Human genes 0.000 description 1
- 108010004977 Vasopressins Proteins 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- KBZOIRJILGZLEJ-LGYYRGKSSA-N argipressin Chemical compound C([C@H]1C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CSSC[C@@H](C(N[C@@H](CC=2C=CC(O)=CC=2)C(=O)N1)=O)N)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](CCCN=C(N)N)C(=O)NCC(N)=O)C1=CC=CC=C1 KBZOIRJILGZLEJ-LGYYRGKSSA-N 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010073 coating (rubber) Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 230000002431 foraging effect Effects 0.000 description 1
- 239000006232 furnace black Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000002304 perfume Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920005638 polyethylene monopolymer Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 238000003878 thermal aging Methods 0.000 description 1
- 229960003726 vasopressin Drugs 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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- Compositions Of Macromolecular Compounds (AREA)
- Belt Conveyors (AREA)
Abstract
The purpose of the present invention is to provide a rubber composition for covering rubber of an air suspension conveyor belt, which is excellent in flame retardancy, low friction properties, processability and aging resistance, and an air suspension conveyor belt. The rubber composition for covering rubber of an air suspension conveyor belt comprises a rubber component comprising at least natural rubber and styrene-butadiene rubber, carbon black, antimony trioxide, and chloroparaffin, wherein the content of the carbon black is 75 parts by mass or more per 100 parts by mass of the rubber component, and the content of the chloroparaffin is 15 to 25 parts by mass per 100 parts by mass of the rubber component, and the air suspension conveyor belt having a covering rubber layer formed by using the rubber composition.
Description
Technical Field
The invention relates to a rubber composition for covering rubber of an air suspension type conveying belt.
Background
Conventionally, an air suspension conveyor belt has been used as an energy-saving conveyor belt for conveying coal. The air suspension type conveyor belt is a conveyor belt for conveying a loaded article by supplying air through air supply holes arranged at equal intervals along the length direction from the lower part of a circular tube (groove) so as to suspend the belt from the circular tube (groove).
In recent years, air suspension conveyor belts are required to cope with fire disasters that have a large influence on safety and production, and there is an increasing demand for flame retardancy.
On the other hand, a rubber composition for a conveyor belt having flame retardancy and the like has been proposed. For example, patent document 1 discloses a rubber composition for a flame-retardant impact-resistant conveyor belt, which comprises 100 parts by mass of a diene rubber, 15 to 30 parts by mass of chlorinated paraffin, 1 to 12 parts by mass of antimony trioxide, and 1 to 11 parts by mass of a petroleum resin and/or oil in total, wherein 100 parts by mass of the diene rubber contains 50 to 100 parts by mass of styrene-butadiene rubber, and the rubber composition for a flame-retardant impact-resistant conveyor belt has improved impact resistance while ensuring flame retardancy.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2012-180475
Disclosure of Invention
Problems to be solved by the invention
In general, since the lower surface covering rubber of the air-suspension type conveyor belt is in contact with the belt support, it is necessary to have low friction properties and the like.
The air levitation type conveyor belt has a carrier side and a return side, but the air levitation type conveyor belt is easily adapted to the shape of the trough by the load of the load since the load is placed on the belt on the carrier side. However, on the return side, the load applied to the belt is only the weight of the belt itself, and the belt is not easily adapted to the shape of the return-side groove, and a part of the upper surface covering rubber may come into contact with the groove. In the case where the air levitation type conveyor belt is used for a long period of time and the rubber layer of the air levitation type conveyor belt is cured, the possibility thereof becomes higher.
In this case, the present inventors have prepared a composition by referring to patent document 1 and evaluated the composition, and as a result, it was found that such a composition may have a large friction.
Therefore, in order to improve the low friction property, the amount of carbon black is increased, and as a result, it is clear that the processability (for example, vulcanization rate) of the rubber composition is sometimes deteriorated.
It is known that if a general oil is used to recover the deterioration of the workability, the aging resistance is deteriorated (the rubber layer is cured in long-term use).
Accordingly, the present invention aims to provide a rubber composition for an air suspension type conveyor belt covering rubber which is excellent in flame retardancy, low friction properties, processability and aging resistance.
In addition, the invention also aims to provide the air suspension type conveying belt.
Means for solving the problems
The present inventors have conducted extensive studies to solve the above problems, and as a result, have found that a rubber composition containing a rubber component containing at least natural rubber and styrene-butadiene rubber, a specific amount of carbon black, antimony trioxide, and a specific amount of chlorinated paraffin can achieve a desired effect, and have completed the present invention.
The present invention solves the above problems based on the above findings and the like, specifically, with the following configurations.
[1]
A rubber composition for air suspension conveyor belt covering rubber, which contains a rubber component containing at least natural rubber and styrene-butadiene rubber, carbon black, antimony trioxide, and chlorinated paraffin,
the content of the carbon black is 75 parts by mass or more per 100 parts by mass of the rubber component,
the content of the chlorinated paraffin is 15 to 25 parts by mass with respect to 100 parts by mass of the rubber component.
[2]
The rubber composition according to item [1], wherein the natural rubber is contained in an amount of 10 to 60% by mass based on the rubber component,
the content of the styrene-butadiene rubber is 40 to 70 mass% of the rubber component.
[3]
The rubber composition according to item [1] or [2], wherein the content of the antimony trioxide is 1 to 10 parts by mass relative to 100 parts by mass of the rubber component.
[4]
The rubber composition according to any one of [1] to [3], wherein the content of the carbon black is 100 parts by mass or less with respect to 100 parts by mass of the rubber component.
[5]
According to [1]]～[4]The rubber composition as described in any of the above, wherein the carbon black contains nitrogen and has a nitrogen adsorption specific surface area of 70m 2 Carbon black in an amount of at least one gram.
[6]
According to [1]]～[5]The rubber composition as described in any of the above, wherein the carbon black contains nitrogen and has an adsorption specific surface area of 100 to 150m 2 Per g of carbon black A, and a nitrogen adsorption specific surface area of 70 to 90m 2 Per g of carbon black B.
[7]
The rubber composition according to any one of [1] to [6], which further contains polyethylene.
[8]
An air suspension conveyor belt comprising a rubber coating layer formed using the rubber composition according to any one of [1] to [7 ].
ADVANTAGEOUS EFFECTS OF INVENTION
The rubber composition for covering rubber of an air suspension conveyor belt of the present invention is excellent in flame retardancy, low friction properties, processability and aging resistance.
Further, the rubber composition for covering a rubber for an air suspension conveyor belt according to the present invention can provide an air suspension conveyor belt excellent in flame retardancy, low friction property, processability and aging resistance.
Drawings
Fig. 1 is a sectional perspective view schematically showing an example of a suitable embodiment of an air levitation type conveyor belt of the present invention.
Detailed Description
The present invention will be described in detail below.
In the present specification, the numerical range expressed by using "to" means a range including the numerical values described before and after "to".
In the present specification, unless otherwise specified, each component may be used alone or in combination with 2 or more kinds of the substances corresponding to the component. When the component contains 2 or more substances, the content of the component means the total content of the 2 or more substances.
In the present specification, more excellent at least 1 out of flame retardancy, low friction property, processability and aging resistance is sometimes referred to as more excellent effect of the present invention.
[ rubber composition for air suspension type conveyor belt covering rubber ]
The rubber composition for air suspension conveyor belt covering rubber of the present invention (the rubber composition of the present invention) is a rubber composition for air suspension conveyor belt covering rubber,
which contains a rubber component comprising at least natural rubber and styrene-butadiene rubber, carbon black, antimony trioxide, and chlorinated paraffin,
the content of the carbon black is 75 parts by mass or more per 100 parts by mass of the rubber component,
the content of the chlorinated paraffin is 15 to 25 parts by mass with respect to 100 parts by mass of the rubber component.
Hereinafter, each component contained in the rubber composition of the present invention will be described in detail.
Rubber component
In the present invention, the rubber component contains at least natural rubber and styrene-butadiene rubber.
< Natural rubber >
The Natural Rubber (NR) contained in the rubber composition of the present invention is not particularly limited. Examples thereof include conventionally known natural rubbers.
< styrene butadiene rubber >
The styrene-butadiene rubber (SBR) contained in the rubber composition of the present invention is not particularly limited. For example, styrene-butadiene rubber which has been conventionally known is cited.
(content of NR, SBR)
From the viewpoint of the excellent effects and low adhesion of the present invention, the content of the natural rubber is preferably 10 to 60% by mass, more preferably 30 to 60% by mass, of the rubber component (total amount).
The styrene-butadiene rubber content is preferably 40 to 70% by mass, more preferably 40 to 45% by mass, of the rubber component (total amount), from the viewpoint of more excellent effects of the present invention and excellent low adhesion.
(other rubbers)
The rubber component may further contain rubber (other rubber) other than natural rubber and styrene-butadiene rubber.
From the viewpoint of further improving the effects of the present invention, the other rubber is preferably a diene rubber such as Isoprene Rubber (IR), butadiene Rubber (BR), nitrile rubber (NBR), chloroprene Rubber (CR), or butyl rubber (IIR), and more preferably Butadiene Rubber (BR).
·BR
The butadiene rubber that can be contained in the rubber composition of the present invention is not particularly limited. For example, conventionally known butadiene rubber can be used.
(contents of NR, SBR, BR)
When the rubber composition of the present invention further contains butadiene rubber, the content of the natural rubber is preferably 20 to 60% by mass, more preferably 20 to 55% by mass in the rubber component (total amount), from the viewpoint of more excellent effects of the present invention and excellent low adhesion.
In the above case, the styrene-butadiene rubber content is preferably 30 to 50% by mass, more preferably 35 to 45% by mass, and even more preferably 40 to 45% by mass of the rubber component (total amount), from the viewpoint of the excellent effects of the present invention and the excellent low adhesiveness.
In the above case, the content of the butadiene rubber is preferably 10 to 30% by mass, more preferably 10 to 20% by mass in the rubber component (total amount), from the viewpoint of more excellent effects of the present invention and excellent low adhesion.
(ratio of the content of the natural rubber to the content of the styrene-butadiene rubber in the case of further containing butadiene rubber)
When the rubber composition of the present invention further contains butadiene rubber, the styrene-butadiene rubber content is preferably 30 to 85% by mass, more preferably 40 to 60% by mass, of the total content of natural rubber and styrene-butadiene rubber, from the viewpoint of more excellent effects of the present invention and excellent low adhesion.
(ratio of the contents of the butadiene rubber and the styrene-butadiene rubber in the case of further containing butadiene rubber)
When the rubber composition of the present invention further contains butadiene rubber, the content of the styrene-butadiene rubber is preferably 60 to 90% by mass, more preferably 65 to 85% by mass, of the total content of the styrene-butadiene rubber and the butadiene rubber, from the viewpoint of more excellent effects of the present invention and excellent low adhesion.
< carbon Black >
The carbon black contained in the rubber composition of the present invention is not particularly limited. Examples thereof include conventionally known carbon blacks.
From the viewpoint of further excellent effects of the present invention and excellent low adhesion, the carbon black preferably contains a nitrogen adsorption specific surface area (N) 2 SA) of 70m 2 More preferably, the carbon black has a nitrogen adsorption specific surface area of 100 to 150m 2 Per g of carbon black A, and a nitrogen adsorption specific surface area of 70 to 90m 2 Carbon black B per g.
From the viewpoint of the excellent effect and low adhesion of the present invention, N in the carbon black A 2 SA is preferably 100 to 120m 2 /g。
From the viewpoint of the excellent effect and low adhesion of the present invention, N of the carbon black B 2 SA is preferably 75 to 85m 2 /g。
The nitrogen adsorption specific surface area of carbon black can be determined in accordance with JIS K6217-2:2001 "section 2: specific gravity determination method 12417the method of local absorption of vasopressin (section 2: determination of specific surface area-nitrogen adsorption method-single-point method)'.
Examples of the carbon black include SAF (Super Abrasion Furnace black), ISAF (Intermediate Super Abrasion Furnace black), HAF (High Abrasion Furnace black), FEF (Fast Extruding Furnace black), GPF (General Purpose Furnace black), SRF (Semi-Reinforcing Furnace black), FT (Fine Thermal black), MT (Medium Thermal black), and the like.
Examples of the carbon black A include ISAF-grade carbon black and SAF-grade carbon black.
Examples of the carbon black B include HAF-grade carbon black and FEF-grade carbon black.
< content of carbon Black >
In the present invention, the content of carbon black is 75 parts by mass or more per 100 parts by mass of the rubber component.
When the content of carbon black is in the above range, the low friction property is excellent.
When 2 or more kinds of carbon black are used as the carbon black, the content of the carbon black refers to the total amount of the carbon black.
From the viewpoint of the excellent effects of the present invention and the excellent low adhesion, the content of carbon black is preferably 100 parts by mass or less, and more preferably 80 to 95 parts by mass, per 100 parts by mass of the rubber component.
In the case where the carbon black includes the carbon black a and the carbon black B, the content of the carbon black a is preferably 50 to 65% by mass, and more preferably 55 to 65% by mass of the total content of the carbon black a and the carbon black B, from the viewpoint of the more excellent effect of the present invention and the excellent low adhesion property.
Antimony trioxide
The antimony trioxide contained in the rubber composition of the present invention is not particularly limited.
Antimony trioxide can function as a flame retardant in the present invention.
(content of antimony trioxide)
From the viewpoint of further improving the effect of the present invention and excellent low adhesion, the content of antimony trioxide is preferably 1 to 10 parts by mass, more preferably 4 to 8 parts by mass, per 100 parts by mass of the rubber component.
Chlorinated paraffin wax
The chlorinated paraffin contained in the rubber composition of the present invention is not particularly limited. Examples thereof include conventionally known chlorinated paraffins.
The chlorinated paraffin may function as a flame retardant and a plasticizer in the present invention.
From the viewpoint of the excellent effect and low adhesiveness of the present invention, the chlorine content of the chlorinated paraffin is preferably 60 to 80 mass%, more preferably 65 to 75 mass%, and still more preferably 68 to 72 mass% in the chlorinated paraffin.
Content of chlorinated Paraffin
In the present invention, the content of the chlorinated paraffin is 15 to 25 parts by mass with respect to 100 parts by mass of the rubber component.
When the content of the chlorinated paraffin is in the above range, the flame retardancy, the low friction property, the processability and the aging resistance are excellent. In addition, the adhesion is low.
From the viewpoint of the excellent effect and low adhesiveness of the present invention, the content of the chlorinated paraffin is preferably 15 to 23 parts by mass, and more preferably 17 to 21 parts by mass.
(polyethylene)
The rubber composition of the present invention preferably further contains polyethylene from the viewpoint of excellent low adhesion.
One preferred embodiment is a polyethylene homopolymer.
Weight average molecular weight of polyethylene
From the viewpoint of further improving the effects of the present invention and reducing the viscosity, the weight average molecular weight (Mw) of the polyethylene is preferably 100 to 250 ten thousand, and more preferably 150 to 230 ten thousand.
(method of measuring weight-average molecular weight of polyethylene)
The weight average molecular weight of polyethylene was determined by GPC (gel permeation chromatography) using molecular weights in terms of standard polystyrene. The measurement apparatus and conditions are as follows.
An apparatus: "HLC-8020" a GPC apparatus manufactured by "12540;
separation column: 2 roots of Chinese imperial gall \12477, manufactured by \1254040
The detector: "differential refractometer RI-8020" manufactured by "Bai Ji 12477;
eluent: tetrahydrofuran (THF)
Eluent flow rate: 1.0 ml/min
Sample concentration: 5mg/10ml
Column temperature: 40 deg.C
Average particle diameter of polyethylene
From the viewpoint of further improving the effect of the present invention and excellent low adhesion, the average particle diameter of the polyethylene is preferably 1 to 300 μm, more preferably 20 to 150 μm.
The average particle diameter of the polyethylene may be the average particle diameter d in the weight-based particle size distribution obtained by the Coulter method 50 。
The average particle size of the polyethylene may be a catalog value.
Content of polyethylene
From the viewpoint of the excellent effect and low adhesiveness of the present invention, the content of the polyethylene is preferably 3 to 10 parts by mass, more preferably 3 to 8 parts by mass, per 100 parts by mass of the rubber component.
From the viewpoint of further improving the effect of the present invention, having excellent low adhesion, and achieving both high levels of flame retardancy and low adhesion, the content of the polyethylene is preferably 9 to 40% by mass, more preferably 13 to 30% by mass, of the total content of the polyethylene and the chlorinated paraffin.
(oil)
From the viewpoint of the excellent effects of the present invention and the excellent low adhesion, the rubber composition of the present invention preferably further contains an oil (excluding chlorinated paraffin).
Examples of the oil include process oil; and mineral oils such as aromatic oils. Examples of the processing oil include conventionally known processing oils. The same applies to aromatic oil and mineral oil.
From the viewpoint of further improving the effects of the present invention and excellent low adhesion, the oil preferably contains a process oil or an aromatic oil, and more preferably contains an aromatic oil.
The aromatic oil is, for example, the content (C) of aromatic hydrocarbon contained in a certain oil A ) Is not less than 20% by mass of the oil. C of oil A 、C P 、C N Can be measured according to the Ring analysis method (n-D-M method) (ASTM D3238).
Oil content
When the rubber composition of the present invention further contains the oil, the content of the oil is preferably 10 to 40 parts by mass, more preferably 20 to 35 parts by mass, and still more preferably 25 to 33 parts by mass, based on 100 parts by mass of the rubber component.
Content of perfume oil
When the rubber composition of the present invention further contains an oil and the oil contains an aromatic oil, the content of the aromatic oil is preferably 90% by mass or more, and more preferably 95 to 100% by mass, of the total amount of the oil.
(additives)
The rubber composition of the present invention may further contain an additive as required.
Examples of the additives include fillers other than carbon black, vulcanizing agents such as sulfur, vulcanization accelerators, vulcanization aids such as zinc oxide and stearic acid, reversion inhibitors, silane coupling agents, antioxidants, ultraviolet absorbers, flame retardants other than chlorinated paraffin and antimony trioxide, tackifiers, and plasticizers other than oils.
The kind and content of each additive can be selected as appropriate.
From the viewpoint of further improving the effect of the present invention, the content of sulfur is preferably 0.5 to 5 parts by mass with respect to 100 parts by mass of the rubber component.
The method for producing the rubber composition of the present invention is not particularly limited. For example, a production method in which the above-mentioned essential components and additives (except for a vulcanizing agent, a vulcanizing aid and a vulcanizing accelerator) which may be further used as necessary are mixed by a banbury mixer or the like, and then the vulcanizing agent, the vulcanizing aid and the vulcanizing accelerator are further added thereto and mixed is exemplified.
The vulcanization of the rubber composition of the present invention can be carried out under the conditions which are usually carried out. The vulcanization can be carried out at a vulcanization temperature of, for example, 140 to 150 ℃. In vulcanization, pressurization may be applied.
The rubber composition of the present invention is a rubber composition for covering rubber of an air suspension conveyor belt.
The rubber composition of the present invention may be applied to the upper surface covering rubber layer and/or the lower surface covering rubber layer of the air levitation type conveyor belt. When the rubber composition of the present invention is applied to the upper surface rubber covering layer and the lower surface rubber covering layer of the air suspension type conveyor belt, the rubber composition for the upper surface rubber covering layer may be the same as or different from the rubber composition for the lower surface rubber covering layer.
[ air suspension type conveyor belt ]
The air suspension conveyor belt of the present invention (conveyor belt of the present invention) is an air suspension conveyor belt having a covering rubber layer formed using the rubber composition of the present invention.
The rubber composition used for the conveyor belt of the present invention is not particularly limited as long as it is the rubber composition of the present invention.
The conveyor belt of the present invention includes, for example, a conveyor belt composed of an upper surface rubber cover layer, a reinforcing layer, and a lower surface rubber cover layer.
The upper surface rubber covering layer and/or the lower surface rubber covering layer may be formed using the rubber composition.
The lower surface covering rubber layer may be 1 layer or more. The same applies to the upper surface covering rubber layer and the reinforcing layer.
< lower surface covering rubber layer >
From the viewpoint of further improving the effects of the present invention and improving the low adhesion, it is preferable that at least the back surface (surface in contact with the roller) of the under-surface-covering rubber layer is formed of the rubber composition of the present invention.
When the lower-surface covering rubber layer has 2 or more layers, at least the layer corresponding to the back surface among the 2 or more layers is preferably formed using the rubber composition of the present invention.
The rubber composition of the present invention may be used for all of the following surface covering rubber layers (including a single layer and a plurality of layers).
< Upper surface covering rubber layer >
From the viewpoint of the excellent effects and low adhesion of the present invention, it is preferable that at least the surface (surface in contact with the conveyed object) of the upper surface rubber layer is formed of the rubber composition of the present invention.
When the upper surface covering rubber layer has 2 or more layers, at least the layer corresponding to the surface among the 2 or more layers is preferably formed using the rubber composition of the present invention.
The rubber composition of the present invention may be used for all of the above surface covering rubber layers (including a single layer and a plurality of layers).
< enhancement layer >
The reinforcing layer is not particularly limited, and a reinforcing layer used for a general conveyor belt can be appropriately selected and used.
The reinforcing layer may have, for example, a core and a bonding rubber (coating rubber). The adhesive rubber (coating rubber) preferably covers the core.
Examples of the material of the core include fibers such as polyester fibers, polyamide fibers, and aramid fibers; a metal such as steel. The above fibers may be used in the form of canvas. The canvas refers to flat woven cloth.
The adhesive rubber is not particularly limited. Examples thereof include conventionally known adhesive rubbers.
The form of the reinforcing layer is not particularly limited, and may be, for example, a sheet form or a form in which bundles of reinforcing wires (for example, steel cords or bundles of the above fibers) are embedded in parallel in the reinforcing layer.
The conveyor belt of the present invention may have a reinforcing layer between the upper surface covering rubber layer and the lower surface covering rubber layer, for example.
In the case where the reinforcing layer is a multilayer, the rubber composition may be disposed between a plurality of reinforcing layers. The rubber composition disposed between the plurality of reinforcing layers is not particularly limited. Examples thereof include conventionally known rubber compositions.
The thickness of the upper surface covering rubber layer may be, for example, 3 to 25mm.
The thickness of the lower surface covering rubber layer may be, for example, 3 to 20mm.
When the upper surface covering rubber layer is composed of 2 or more layers, the thickness of the upper surface covering rubber layer may be the total thickness of these layers. The thickness of the lower surface covering rubber layer is also the same.
The conveyor belt of the present invention will be described below with reference to the drawings. It should be noted that the present invention is not limited to the drawings.
Fig. 1 is a sectional perspective view schematically showing an example of a suitable embodiment of the conveyor belt of the present invention.
In fig. 1, a conveyor belt 1 is composed of an upper surface cap rubber layer 2, a reinforcing layer 3, and a lower surface cap rubber layer 4, which are laminated in this order.
The upper surface covering rubber layer 2 has an outer layer 11 and an inner layer 12. The under-surface covering rubber layer 4 has an inner layer 15 and an outer layer 16.
The outer layer 16 is in contact with the rollers when the conveyor belt 1 is applied to an air-suspension belt conveyor. The surface 5 of the upper surface covering rubber layer 2 (outer layer 11) may be a conveyance surface.
At least one or both of the outer layer 11 and the outer layer 16 may be formed by using the rubber composition of the present invention.
In the lower surface covering rubber layer 4, the outer layer 16, which is the back surface of the lower surface covering rubber layer 4, is preferably formed of at least the rubber composition of the present invention. The outer layer 16 and the inner layer 15 may also be formed using the rubber composition of the present invention. The inner layer 15 may be an adhesive layer for bonding the reinforcing layer 3 and the outer layer 16.
In the upper surface covering rubber layer 2, the outer layer 11 which is the surface of the upper surface covering rubber layer 2 is preferably formed of at least the rubber composition of the present invention. The outer layer 11 and the inner layer 12 may also be formed using the rubber composition of the present invention. The inner layer 12 may be an adhesive layer for bonding the reinforcing layer 3 and the outer layer 11.
The method for manufacturing the conveyor belt of the present invention is not particularly limited. Examples thereof include conventionally known production methods. Specifically, there is a method for producing the conveyor belt of the present invention, which comprises molding the rubber composition of the present invention for the lower surface covering rubber layer and the rubber composition of the present invention for the upper surface covering rubber layer into a sheet, laminating the sheet of the rubber composition for the upper surface covering rubber layer, the reinforcing layer and the sheet of the composition of the present invention in this order, and pressing the resulting laminate at a temperature of 150 to 170 ℃ for 10 to 60 minutes. A sheet of another rubber composition may be disposed between the reinforcing layer and the sheet of the rubber composition of the present invention.
The conveyor belt of the present invention can be used as an air suspension conveyor belt.
Examples
The following examples illustrate the present invention in detail. However, the present invention is not limited thereto.
Production of rubber composition
The components shown in table 1 below were used in the compositions (parts by mass) shown in the table, and these were mixed with a mixer to prepare rubber compositions.
[ evaluation ]
The following evaluations were made using each of the rubber compositions produced as described above. The results are shown in table 1.
< Low Friction >
(evaluation method)
First, each of the rubber compositions produced as described above was vulcanized for 30 minutes under a pressure of 3.0MPa in the press molding machine at 150 ℃ to produce a vulcanized rubber having a thickness of 10 mm. Vulcanized rubber was cut into pieces of 10mm in the vertical direction, 10mm in the horizontal direction and 10mm in the thickness to produce vulcanized rubber test pieces.
Next, the vulcanized rubber test piece produced as described above was placed on a disk-shaped iron plate, and the iron plate was rotated at a speed of 300 mm/min in a state where the vulcanized rubber test piece was pressure-bonded to the iron plate by applying a vertical load of 4.90N to the vulcanized rubber test piece, and the horizontal load applied to the rubber test piece at this time was measured. Further, the applied load and the measured horizontal load are substituted into the following expression to calculate the dynamic friction coefficient.
Coefficient of dynamic friction (μ k) = horizontal load/vertical load
(evaluation criteria)
In the present invention, when the coefficient of dynamic friction is 0.5 μ k or less, the low friction property is excellent.
On the other hand, when the coefficient of dynamic friction exceeds 0.5. Mu.k, the low friction property is evaluated to be poor.
The lower the coefficient of dynamic friction is, the more excellent the low friction property is, the lower the driving resistance can be.
< Low tack >
(evaluation method)
Using a sample in which the vulcanized rubber test piece and the iron plate were pressure-bonded after the horizontal load measurement, a load cell was attached to the vulcanized rubber test piece of the above sample, and the vulcanized rubber test piece (sample) was lifted upward to measure the peel strength when the vulcanized rubber test piece was peeled from the iron plate.
(evaluation criteria)
In the present invention, when the peel strength is 1.0kgf or less, the low tackiness is excellent. The lower the peel strength is, the more excellent the low adhesion is, the lower the driving resistance can be, the lower the peeling strength is, the lower the adhesion is, the more excellent the adhesion is, the lower the driving resistance is.
On the other hand, when the peel strength exceeds 1.0kgf, the low adhesiveness is evaluated to be poor.
< aging resistance >
(preparation of test piece)
First, each of the rubber compositions produced as described above was vulcanized for 30 minutes under a pressure of 3.0MPa in a press molding machine at 148 ℃ to produce a vulcanized sheet having a thickness of 2 mm. From this sheet, a JIS No. 3 dumbbell test piece (initial test piece) was punched out.
Next, a heat aging resistance test was performed in which each of the initial test pieces manufactured as described above was left at 70 ℃ for 168 hours, to obtain a post-heat aging resistance test piece.
(evaluation method)
Aging resistance 1 (. DELTA.EB)
Each of the initial test pieces and each of the test pieces after heat aging resistance manufactured as described above were measured according to JIS K6251:2017, a tensile test was conducted at 25 ℃ and a tensile rate of 500 mm/min, and the elongation at break (initial EB) [% ] of each initial test piece and the elongation at break (EB after aging resistance) [% ] of each test piece after heat aging resistance were measured.
Δ EB (%) was calculated by substituting each of the initial EBs and the post-aging EBs obtained as described above into the following formula.
Δ EB (%) = (EB after aging resistance-initial EB)/initial EB × 100
Resistance to ageing 2 (. DELTA.HS)
Each of the initial test pieces and each of the test pieces after heat aging resistance manufactured as described above were measured according to JIS K6253-3:2012, type a durometer hardness test was performed at 25 ℃, and the hardness of each initial test piece (initial HS) and the hardness of each test piece after thermal aging resistance (hardness after aging resistance) were measured.
Δ HS was calculated by substituting each of the initial HS and each of the post-aging HS obtained as described above into the following formula.
Δ HS = HS-initial HS after aging resistance
(evaluation criteria for aging resistance)
In the present invention, when the absolute value of Δ EB is 20 or less and the absolute value of Δ HS is less than 5, the aging resistance (heat aging resistance) is excellent.
The smaller the absolute value of Δ EB is less than 20, and/or the smaller the absolute value of Δ HS is less than 5, the more excellent the aging resistance (heat aging resistance).
On the other hand, when the absolute value of Δ EB exceeds 20 or when the absolute value of Δ HS is 5 or more, it is evaluated that the aging resistance (heat aging resistance) is poor.
< flame retardancy >
(evaluation method)
A rubber belt (test piece) of a cloth layer conveyor was produced using each of the rubber compositions produced as described above as a cover rubber layer. In the above production, vulcanization is carried out under pressure at 150 ℃ for 30 minutes.
Using 3 test pieces each produced as described above, the test pieces were measured according to JIS K6324:2013, a flame retardancy test was performed, and the duration (seconds) of the flame of each test piece was measured to obtain the average value (average value of 3 pieces) of the duration of the flame of each test piece.
(evaluation criteria)
In the present invention, regarding the duration of flame, the flame duration is measured in accordance with JIS K6324:2013, the average value of the flame-holding times of the respective test pieces obtained as described above was 60 seconds or less, and the flame retardancy was evaluated as excellent.
The flame retardancy is more excellent when the average value of the flame duration is less than 60 seconds.
On the other hand, when the average value of the flame duration exceeded 60 seconds, the flame retardancy was evaluated to be poor.
< processability >
(evaluation method)
Each rubber composition (unvulcanized) produced as described above was vulcanized in accordance with JIS K6300-2:2001 "no added sulfur, 1246812512nd part 2: the method of determining the vulcanization properties of the turbine test 1242427A vulcanization curve was measured with the obtained torque as the vertical axis and the vulcanization time as the horizontal axis. The maximum value M of the torque is obtained from the vulcanization curve obtained H And minimum value M L 。
(evaluation criteria)
Maximum value M to be obtained as described above H And minimum value M L The difference is set as M E . Will reach M L +M E The time for a torque of × 0.95 is T95.
Each T95 obtained as described above was represented by an index in which T95 of comparative example 7 was set to 1.0.
In the present invention, when the index is 3.0 or less, the processability (vulcanization rate) is excellent. The lower the index is than 3.0, the more excellent the processability is.
On the other hand, when the index exceeds 3.0, the workability is poor.
[ Table 1]
[ Table 2]
[ Table 3]
The details of each component shown in table 1 are as follows.
< rubber component >
NR: natural rubber (RSS # 3)
SBR: styrene-butadiene rubber (Nipol 1502, manufactured by Nippon \124761245812531
BR: butadiene rubber (Nipol BR1220, manufactured by Nippon \124761245812531
< carbon Black >
ISAF stageCarbon black: n is a radical of hydrogen 2 SA120m 2 /g
HAF grade carbon black: n is a radical of 2 SA80m 2 /g
SRF grade carbon black: n is a radical of hydrogen 2 SA27m 2 /g
< flame retardant >
Chlorinated paraffin: \\ 12456971252170S, 125891254065\\ 1251112459. The chlorine content is 70% by mass of the chlorinated paraffin
Antimony trioxide: PATOX-M, manufactured by Japan concentrate Co., ltd
Polyethylene: high molecular weight polyethylene. The weight average molecular weight is 200 ten thousand, and the average particle diameter is 30 μm. Trade name of 12511\\\1252531XM 220, manufactured by Mitsui chemical corporation.
< oil >)
Oil: aromatic oil (A-OMIX, manufactured by Sancomely Co., ltd.) (C) A ) 20% by mass or more
< vulcanizing agent/vulcanization accelerator >
Sulfur: sulfur micropowder (Fine chemical industry Co., ltd.)
Vulcanization accelerator NS: \12494, 12475\\ 1252140NS-P (manufactured by Dai Ingress Innovation chemical industry Co., ltd.
Vulcanization accelerator TT: \\ 12469
As is clear from the results shown in Table 1, comparative example 1 which contained no chlorinated paraffin and antimony trioxide was inferior in aging resistance and flame retardancy.
Comparative examples 2 to 4, which contained a small amount of carbon black, were inferior in low friction property. The low adhesion property of comparative example 2 was also poor. The processability of comparative examples 3 to 4 was also poor.
Comparative example 5, in which the content of chlorinated paraffin is less than the predetermined range, is inferior in flame retardancy.
Comparative example 6, in which the content of chlorinated paraffin is more than the predetermined range, is inferior in processability. The low adhesion property of comparative example 6 was also poor.
Comparative example 7, which did not contain chlorinated paraffin and antimony trioxide, was inferior in aging resistance and processability.
In contrast, the rubber composition of the present invention is excellent in flame retardancy, low friction properties, processability and aging resistance. Further, the rubber composition of the present invention is also excellent in low tackiness.
Description of the symbols
1: conveying belt
2: the upper surface is covered with a rubber layer
3: enhancement layer
4: lower surface covering rubber layer
5: surface of
11. 16: outer layer
12. 15: an inner layer.
Claims (8)
1. A rubber composition for air suspension type conveyor belt covering rubber, which contains:
a rubber component at least comprising natural rubber and styrene-butadiene rubber,
Carbon black,
Antimony trioxide, and
the chlorinated paraffin is used as a solvent for the reaction,
the content of the carbon black is 75 parts by mass or more per 100 parts by mass of the rubber component,
the content of the chlorinated paraffin is 15 to 25 parts by mass with respect to 100 parts by mass of the rubber component.
2. The rubber composition according to claim 1, wherein the natural rubber is contained in an amount of 10 to 60 mass% in the rubber component,
the content of the styrene-butadiene rubber is 40-70% by mass of the rubber component.
3. The rubber composition according to claim 1 or 2, wherein the content of the antimony trioxide is 1 to 10 parts by mass with respect to 100 parts by mass of the rubber component.
4. The rubber composition according to any one of claims 1 to 3, wherein the content of the carbon black is 100 parts by mass or less with respect to 100 parts by mass of the rubber component.
5. The rubber composition according to any one of claims 1 to 4, the charThe adsorption specific surface area of the nitrogen contained in black is 70m 2 Carbon black in an amount of at least one gram.
6. The rubber composition according to any one of claims 1 to 5, wherein the carbon black has a nitrogen adsorption specific surface area of 100 to 150m 2 Carbon black A in a ratio of 70 to 90m in terms of a nitrogen adsorption specific surface area 2 Per g of carbon black B.
7. The rubber composition according to any one of claims 1 to 6, further comprising polyethylene.
8. An air suspension conveyor belt comprising a cover rubber layer formed using the rubber composition according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2021-143170 | 2021-09-02 | ||
| JP2021143170A JP2023036235A (en) | 2021-09-02 | 2021-09-02 | Rubber composition for air floating type conveyor belt cover rubber |
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| CN115746414A true CN115746414A (en) | 2023-03-07 |
| CN115746414B CN115746414B (en) | 2024-05-31 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101535399A (en) * | 2006-11-10 | 2009-09-16 | 阪东化学株式会社 | Transmission belt and process for producing the same |
| JP2012180475A (en) * | 2011-03-02 | 2012-09-20 | Yokohama Rubber Co Ltd:The | Rubber composition for conveyor belt and conveyor belt |
| CN103467802A (en) * | 2013-08-26 | 2013-12-25 | 青岛汇洋矿山带有限公司 | Anti-tensile and wear-proof flame-retardant conveying belt covering rubber and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101535399A (en) * | 2006-11-10 | 2009-09-16 | 阪东化学株式会社 | Transmission belt and process for producing the same |
| JP2012180475A (en) * | 2011-03-02 | 2012-09-20 | Yokohama Rubber Co Ltd:The | Rubber composition for conveyor belt and conveyor belt |
| CN103467802A (en) * | 2013-08-26 | 2013-12-25 | 青岛汇洋矿山带有限公司 | Anti-tensile and wear-proof flame-retardant conveying belt covering rubber and preparation method thereof |
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