CN115746414B - Rubber composition for covering rubber of air suspension conveyor belt - Google Patents
Rubber composition for covering rubber of air suspension conveyor belt Download PDFInfo
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- CN115746414B CN115746414B CN202210857267.7A CN202210857267A CN115746414B CN 115746414 B CN115746414 B CN 115746414B CN 202210857267 A CN202210857267 A CN 202210857267A CN 115746414 B CN115746414 B CN 115746414B
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 203
- 239000005060 rubber Substances 0.000 title claims abstract description 203
- 239000000203 mixture Substances 0.000 title claims abstract description 92
- 239000000725 suspension Substances 0.000 title abstract description 19
- 239000006229 carbon black Substances 0.000 claims abstract description 59
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000012188 paraffin wax Substances 0.000 claims abstract description 28
- 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
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 21
- -1 polyethylene Polymers 0.000 claims description 19
- 239000004698 Polyethylene Substances 0.000 claims description 18
- 229920000573 polyethylene Polymers 0.000 claims description 18
- 238000001179 sorption measurement Methods 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- 239000007858 starting material Substances 0.000 claims 1
- 230000032683 aging Effects 0.000 abstract description 31
- 239000010410 layer Substances 0.000 description 98
- 235000019241 carbon black Nutrition 0.000 description 49
- 238000012360 testing method Methods 0.000 description 32
- 230000000694 effects Effects 0.000 description 28
- 239000003921 oil Substances 0.000 description 24
- 238000004073 vulcanization Methods 0.000 description 23
- 239000005062 Polybutadiene Substances 0.000 description 18
- 229920002857 polybutadiene Polymers 0.000 description 18
- 230000003014 reinforcing effect Effects 0.000 description 17
- 238000011156 evaluation Methods 0.000 description 12
- 239000004636 vulcanized rubber Substances 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 239000010692 aromatic oil Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 7
- 238000007667 floating Methods 0.000 description 6
- 238000013101 initial test Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000654 additive Substances 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 239000006232 furnace black Substances 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 229920000459 Nitrile rubber Polymers 0.000 description 4
- 239000006242 Semi-Reinforcing Furnace Substances 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000003063 flame retardant Substances 0.000 description 4
- 239000006243 Fine Thermal Substances 0.000 description 3
- 239000006238 High Abrasion Furnace Substances 0.000 description 3
- 239000002174 Styrene-butadiene Substances 0.000 description 3
- 239000006236 Super Abrasion Furnace Substances 0.000 description 3
- 229920003244 diene elastomer Polymers 0.000 description 3
- 238000005227 gel permeation chromatography Methods 0.000 description 3
- 238000005339 levitation Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 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 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 239000006240 Fast Extruding Furnace 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
- 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
- 229930192650 Santalin Natural products 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 239000006096 absorbing agent Substances 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
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010073 coating (rubber) Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000945 filler Substances 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
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 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
- 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
- 239000010734 process oil Substances 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
- 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
- 239000011787 zinc oxide Substances 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Belt Conveyors (AREA)
Abstract
The invention aims to provide a rubber composition for an air suspension conveyor belt covering rubber, which is excellent in flame retardance, low friction, processability and aging resistance, and an air suspension conveyor belt. The solution is that the rubber composition for air suspension type conveyer belt cover rubber comprises a rubber component at least comprising natural rubber and styrene-butadiene rubber, carbon black, antimony trioxide and chlorinated paraffin, wherein the content of the carbon black is 75 parts by mass or more relative to 100 parts by mass of the rubber component, and the content of the chlorinated paraffin is 15-25 parts by mass relative to 100 parts by mass of the rubber component, and an air suspension type conveyer belt having a cover rubber layer formed by using the rubber composition.
Description
Technical Field
The present invention relates to a rubber composition for covering rubber on an air-suspended conveyor belt.
Background
Conventionally, an air-floating conveyor belt has been used as an energy-saving conveyor belt for conveying coal. The air suspension conveyor is a conveyor that conveys a load by suspending the conveyor from a circular tube (groove) by supplying air through air supply holes provided at equal intervals in the longitudinal direction from the lower part of the circular tube (groove).
In recent years, air-suspended conveyors have been required to cope with fire disasters that have a great influence on safety and production, and demands for flame retardance have been increasing.
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 describes a rubber composition for a conveyor belt, which contains 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, in which 50 to 100 parts by mass of styrene-butadiene rubber is contained in 100 parts by mass of the diene rubber, for the purpose of providing a rubber composition for a conveyor belt, etc., which has improved flame retardancy and impact resistance.
Prior art literature
Patent literature
Patent document 1: japanese patent application laid-open No. 2012-180758
Disclosure of Invention
Problems to be solved by the invention
In general, the lower surface cover rubber of the air suspension conveyor belt is in contact with the belt support, and therefore needs to have low friction and the like.
The air-levitation type conveyor has a carrier side and a return side, but the air-levitation type conveyor is easily adapted to the shape of the trough by the load of the load because 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, and it is not easy to adapt to the shape of the return side groove, and there is a possibility that a part of the upper surface covering rubber contacts the groove. In the case where the air-floating type conveyor belt is used for a long period of time and the rubber layer of the air-floating type conveyor belt is cured, the possibility thereof becomes higher.
In this case, the present inventors prepared a composition with reference to patent document 1, and evaluated the composition, and as a result, they have 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 may be 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 during long-term use).
Accordingly, the present invention has an object of providing a rubber composition for an air suspension conveyor belt cover rubber which is excellent in flame retardancy, low friction, processability and aging resistance.
In addition, the invention aims to provide an air suspension conveyor belt.
Means for solving the problems
The present inventors have conducted intensive studies to solve the above problems, and as a result, have found that a rubber composition containing a rubber component comprising at least a natural rubber and a styrene-butadiene rubber, a specific amount of carbon black, antimony trioxide, and a specific amount of chlorinated paraffin can obtain a desired effect, and have completed the present invention.
The present invention is based on the above-described knowledge, and specifically solves the above-described problems by the following configuration.
[1]
A rubber composition for an air suspension conveyor belt cover rubber, comprising a rubber component comprising at least a natural rubber and a styrene-butadiene rubber, carbon black, antimony trioxide, and chlorinated paraffin,
The content of the carbon black is 75 parts by mass or more based on 100 parts by mass of the rubber component,
The chlorinated paraffin content is 15 to 25 parts by mass per 100 parts by mass of the rubber component.
[2]
The rubber composition according to [1], wherein the content of the natural rubber is 10 to 60% by mass based on the rubber component,
The styrene-butadiene rubber content is 40 to 70 mass% of the rubber component.
[3]
The rubber composition according to [1] or [2], wherein the content of the antimony trioxide is 1 to 10 parts by mass based on 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 based on 100 parts by mass of the rubber component.
[5]
The rubber composition according to any one of [1] to [4], wherein the carbon black comprises a carbon black having a nitrogen adsorption specific surface area of 70m 2/g or more.
[6]
The rubber composition according to any one of [1] to [5], wherein the carbon black comprises carbon black A having a nitrogen adsorption specific surface area of 100 to 150m 2/g and carbon black B having a nitrogen adsorption specific surface area of 70 to 90m 2/g.
[7]
The rubber composition according to any one of [1] to [6], which further contains polyethylene.
[8]
An air-floating conveyor belt comprising a cover rubber layer formed using the rubber composition according to any one of [1] to [7 ].
ADVANTAGEOUS EFFECTS OF INVENTION
The rubber composition for an air suspension conveyor belt cover rubber of the present invention is excellent in flame retardance, low friction, processability and aging resistance.
Further, according to the rubber composition for an air suspension conveyor belt cover rubber of the present invention, an air suspension conveyor belt excellent in flame retardancy, low friction, processability and aging resistance can be provided.
Drawings
Fig. 1 is a cross-sectional perspective view schematically showing an example of a suitable embodiment of the air suspension conveyor belt of the present invention.
Detailed Description
The present invention will be described in detail below.
In the present specification, the numerical range indicated by the term "to" refers to a range including numerical values described before and after the term "to".
In the present specification, each component may be used alone or in combination of 2 or more kinds of substances corresponding to the component unless otherwise specified. 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, at least 1 of the flame retardancy, low friction, processability and aging resistance is sometimes more excellent as the effect of the present invention is more excellent.
[ Rubber composition for rubber coating air-suspended conveyor belt ]
The rubber composition for air-suspended conveyor belt cover rubber of the present invention (the rubber composition of the present invention) is a rubber composition for air-suspended conveyor belt cover rubber,
Which comprises a rubber component comprising at least a natural rubber and a styrene-butadiene rubber, carbon black, antimony trioxide, and chlorinated paraffin,
The content of the carbon black is 75 parts by mass or more based on 100 parts by mass of the rubber component,
The chlorinated paraffin content is 15 to 25 parts by mass per 100 parts by mass of the rubber component.
The components contained in the rubber composition of the present invention will be described in detail below.
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. For example, conventionally known natural rubber is used.
Styrene butadiene rubber
The Styrene Butadiene Rubber (SBR) contained in the rubber composition of the present invention is not particularly limited. For example, conventionally known styrene-butadiene rubber is used.
(Content of NR and SBR)
The content of the natural rubber is preferably 10 to 60 mass%, more preferably 30 to 60 mass% of the rubber component (total amount) from the viewpoint of more excellent effect and low tackiness of the present invention.
The content of the styrene-butadiene rubber is preferably 40 to 70 mass%, more preferably 40 to 45 mass% of the rubber component (total amount) from the viewpoint of more excellent effect and low tackiness of the present invention.
(Other rubbers)
The rubber component may further contain a rubber (other rubber) other than natural rubber and styrene-butadiene rubber.
From the viewpoint of the more excellent effect 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 invention is not particularly limited. For example, conventionally known butadiene rubber is used.
(NR, SBR, BR content)
When the rubber composition of the present invention further contains butadiene rubber, the content of the natural rubber is preferably 20 to 60 mass%, more preferably 20 to 55 mass% of the rubber component (total amount) from the viewpoint of further excellent effect of the present invention and excellent low tackiness.
In the above case, the content of the styrene-butadiene rubber is preferably 30 to 50% by mass, more preferably 35 to 45% by mass, and even more preferably 40 to 45% by mass based on the rubber component (total amount) from the viewpoint of further excellent effect and low tackiness of the present invention.
In the above case, the content of the butadiene rubber is preferably 10 to 30 mass%, more preferably 10 to 20 mass% of the rubber component (total amount) from the viewpoint of further excellent effect and low tackiness of the present invention.
(Ratio of the content of Natural rubber to 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 mass% of the total content of the natural rubber and the styrene-butadiene rubber, and more preferably 40 to 60 mass% from the viewpoint of further excellent effect of the present invention and excellent low tackiness.
(Ratio of styrene butadiene rubber to butadiene rubber content 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 mass% of the total content of the styrene-butadiene rubber and the butadiene rubber, and more preferably 65 to 85 mass% from the viewpoint of further excellent effect of the present invention and excellent low tackiness.
< Carbon black >
The carbon black contained in the rubber composition of the present invention is not particularly limited. For example, conventionally known carbon black is used.
From the viewpoint of the more excellent effect and low tackiness of the present invention, the carbon black preferably contains carbon black a having a nitrogen adsorption specific surface area (N 2 SA) of 70m 2/g or more, more preferably contains carbon black a having a nitrogen adsorption specific surface area of 100 to 150m 2/g and carbon black B having a nitrogen adsorption specific surface area of 70 to 90m 2/g.
From the viewpoint of the more excellent effect of the present invention and the excellent low tackiness, N 2 SA of carbon black A is preferably 100 to 120m 2/g.
From the viewpoint of the more excellent effect of the present invention and the excellent low tackiness, N 2 SA of carbon black B is preferably 75 to 85m 2/g.
The nitrogen adsorption specific surface area of the carbon black can be determined in accordance with JIS K6217-2:2001 "section 2: the specific surface area was measured by the method of determining the size of the cone-asphyxin adsorption method- single (part 2: determination of specific surface area-nitrogen adsorption method-single point method) ".
Examples of the carbon black include SAF (super wear resistant furnace black, super Abrasion Furnace), ISAF (Medium super wear resistant furnace black, INTERMEDIATE SUPER ABRASION FURNACE), HAF (high wear resistant furnace black, high Abrasion Furnace), FEF (fast extrusion furnace black, fast Extruding Furnace), GPF (general furnace black, general Purpose Furnace), SRF (Semi-reinforcing furnace black, semi-Reinforcing Furnace), FT (fine Thermal black, FINE THERMAL), 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.
< Carbon black content >
In the present invention, the content of carbon black is 75 parts by mass or more with respect to 100 parts by mass of the rubber component.
The carbon black content is in the above range, and thus the low friction property is excellent.
In the case where 2 or more kinds of carbon blacks are used as the carbon blacks, the content of the carbon black refers to the total amount of the carbon blacks.
From the viewpoint of the further excellent effect and low tackiness of the present invention, the content of carbon black is preferably 100 parts by mass or less, more preferably 80 to 95 parts by mass, relative to 100 parts by mass of the rubber component.
When the carbon black contains the carbon black a and the carbon black B, the content of the carbon black a is preferably 50 to 65 mass%, more preferably 55 to 65 mass% of the total content of the carbon black a and the carbon black B, from the viewpoint that the effect of the present invention is more excellent and the low tackiness is excellent.
Antimony trioxide
The antimony trioxide contained in the rubber composition of the present invention is not particularly limited.
Antimony trioxide can act as a flame retardant in the present invention.
(Content of antimony trioxide)
From the viewpoint of the more excellent effect and the excellent low adhesion of the present invention, the content of antimony trioxide is preferably 1 to 10 parts by mass, more preferably 4 to 8 parts by mass, relative to 100 parts by mass of the rubber component.
Chlorinated paraffin
The chlorinated paraffin contained in the rubber composition of the present invention is not particularly limited. Examples thereof include conventionally known chlorinated paraffin.
Chlorinated paraffins may act as flame retardants and plasticizers in the present invention.
From the viewpoint of the more excellent effect and the excellent low tackiness of the present invention, the chlorine content of the chlorinated paraffin is preferably 60 to 80% by mass, more preferably 65 to 75% by mass, and even more preferably 68 to 72% by mass of the chlorinated paraffin.
< Content of chlorinated Paraffin >
In the present invention, the content of chlorinated paraffin is 15 to 25 parts by mass based on 100 parts by mass of the rubber component.
The chlorinated paraffin content in the above range is excellent in flame retardancy, low friction, processability and aging resistance. In addition, the low tackiness is excellent.
The content of chlorinated paraffin is preferably 15 to 23 parts by mass, more preferably 17 to 21 parts by mass, from the viewpoint of more excellent effect and low tackiness of the present invention.
(Polyethylene)
From the viewpoint of excellent low tackiness, the rubber composition of the present invention preferably further contains polyethylene.
Polyethylene is a polyethylene homopolymer as one of the preferred embodiments.
Weight average molecular weight of polyethylene
From the viewpoint of the more excellent effect and the excellent low tackiness of the present invention, the weight average molecular weight (Mw) of the polyethylene is preferably 100 to 250 tens of thousands, more preferably 150 to 230 tens of thousands.
(Method for measuring weight average molecular weight of polyethylene)
The weight average molecular weight of polyethylene was determined by GPC (gel permeation chromatography) on the molecular weight scale of standard polystyrene. The measurement apparatus and conditions are as follows.
Device: GPC apparatus "HLC-8020" manufactured by Too Co., ltd "
Separation column: the "GMH-HR-H"2 roots manufactured by Too-Yu Co., ltd
Detector: differential refractometer RI-8020 manufactured by Too Yu Co., ltd "
Eluent: tetrahydrofuran (THF)
Eluent flow rate: 1.0 ml/min
Sample concentration: 5mg/10ml
Column temperature: 40 DEG C
Average particle size of polyethylene
The average particle diameter of the polyethylene is preferably 1 to 300. Mu.m, more preferably 20 to 150. Mu.m, from the viewpoint of more excellent effect of the present invention and excellent low tackiness.
The average particle diameter of the polyethylene may be the average particle diameter d 50 in the weight-basis particle size distribution obtained by the coulter method.
The average particle size of the polyethylene may be a catalogue value.
Polyethylene content
From the viewpoint of the more excellent effect of the present invention and the excellent low tackiness, the content of polyethylene is preferably 3 to 10 parts by mass, more preferably 3 to 8 parts by mass, relative to 100 parts by mass of the rubber component.
From the viewpoint of the invention having more excellent effect and low tackiness and having both flame retardancy and low tackiness at a high level, the content of polyethylene is preferably 9 to 40 mass%, more preferably 13 to 30 mass%, of the total content of the polyethylene and the chlorinated paraffin.
(Oil)
From the viewpoint of the further excellent effect of the present invention and the excellent low tackiness, the rubber composition of the present invention preferably further contains an oil (excluding chlorinated paraffin).
Examples of the oil include processing oil; mineral oils such as aromatic oils. The processing oil may be, for example, a conventionally known processing oil. The same applies to aromatic oils and mineral oils.
From the viewpoint of the excellent effect of the present invention and the 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, an oil in which the content (C A) of aromatic hydrocarbons contained in a certain oil is 20% by mass or more of the oil. C A、CP、CN of the oil can be determined according to the ring analysis method (n-D-M method) (ASTM D3238).
Content of oil
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 even more preferably 25 to 33 parts by mass, relative to 100 parts by mass of the rubber component.
Content of aromatic oil
In the case where 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, more preferably 95 to 100% by mass, based on the total amount of the oil.
(Additive)
The rubber composition of the present invention may further contain additives as required.
Examples of the additives include fillers other than carbon black, vulcanizing agents such as sulfur, vulcanization accelerators, vulcanizing 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, plasticizers other than oil removal, and the like.
The kind and content of each additive may be appropriately selected.
From the viewpoint of further excellent effects of the present invention, the sulfur content is preferably 0.5 to 5 parts by mass relative 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 may be mentioned in which the above-mentioned essential components and additives (except for a vulcanizing agent, a vulcanization aid, and a vulcanization accelerator) which may be further used if necessary are mixed with a Banbury mixer or the like, and then a vulcanizing agent, a vulcanization aid, and a vulcanization accelerator are further added thereto and mixed.
The vulcanization of the rubber composition of the present invention can be carried out under usual conditions. The vulcanization may be carried out at a vulcanization temperature of, for example, 140 to 150 ℃. In vulcanization, pressurization is also possible.
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 an upper surface-covering rubber layer and/or a lower surface-covering rubber layer of an air suspension conveyor belt. In the case where the rubber composition of the present invention is applied to the upper surface-covering rubber layer and the lower surface-covering rubber layer of the air suspension conveyor belt, the rubber composition for the upper surface-covering rubber layer may be the same as or different from the rubber composition for the lower surface-covering rubber layer.
[ Air suspension conveyor belt ]
The air-floating conveyor belt of the present invention (conveyor belt of the present invention) is an air-floating conveyor belt having a cover 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-covering rubber layer, a reinforcing layer, and a lower surface-covering rubber layer.
The upper surface-covering rubber layer and/or the lower surface-covering rubber layer may be formed using the above-mentioned rubber composition.
The lower surface covering rubber layer may be 1 layer or multiple layers. The same applies to the upper surface covering rubber layer and the reinforcing layer.
< Lower surface covering rubber layer >)
From the viewpoint of the further excellent effect of the present invention and the excellent low tackiness, the lower surface-covering rubber layer is preferably formed of the rubber composition of the present invention on at least the back surface (the surface contacting the roller) of the lower surface-covering rubber layer.
When the lower surface covering rubber layer has 2 or more layers, it is preferable that at least a layer corresponding to the back surface of the 2 or more layers is formed using the rubber composition of the present invention.
The rubber composition of the present invention may be used for the whole of the lower surface-covering rubber layer (including single-layer and multi-layer ones).
< Upper surface covering rubber layer >)
From the viewpoint of the further excellent effect of the present invention and the excellent low tackiness, the upper surface-covering rubber layer is preferably formed of the rubber composition of the present invention on at least the surface (the surface contacting the conveyance object) of the upper surface-covering rubber layer.
When the upper surface-covering rubber layer has 2 or more layers, it is preferable that at least a layer corresponding to the surface among the 2 or more layers is formed using the rubber composition of the present invention.
The rubber composition of the present invention may be used in its entirety to form a rubber layer (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 normal conveyor belt may be appropriately selected and used.
The reinforcing layer may have, for example, a core and an adhesive rubber (coating rubber). The adhesive rubber (coating rubber) is preferably used for the core.
Examples of the material of the core include fibers such as polyester fibers, polyamide fibers, and aramid fibers; metals such as steel. The fibers described above may be used in the form of canvas. Canvas refers to a flat woven cloth.
The adhesive rubber is not particularly limited. For example, conventionally known adhesive rubber is used.
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 threads (for example, steel cords and bundles of the 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 plurality of layers, the rubber composition may be disposed between the plurality of reinforcing layers. The rubber composition disposed between the plurality of reinforcing layers is not particularly limited. For example, conventionally known rubber compositions are mentioned.
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.
In the case where 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 sum of the thicknesses 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. The present invention is not limited to the drawings.
Fig. 1 is a cross-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 covering rubber layer 2, a reinforcing layer 3, and a lower surface covering 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 lower surface covering rubber layer 4 has an inner layer 15 and an outer layer 16.
When the conveyor belt 1 is applied to an air-suspended belt conveyor, the outer layer 16 is in contact with the rollers. The surface 5 of the upper surface covering rubber layer 2 (outer layer 11) may be a transport surface for the transported object.
At least one or both of the outer layers 11 and 16 may be formed 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 at least from the rubber composition of the present invention. The rubber composition of the present invention may also be used to form the outer layer 16 and the inner layer 15. The inner layer 15 may be an adhesive layer for adhering the reinforcing layer 3 and the outer layer 16.
In the upper surface-covering rubber layer 2, it is preferable that the outer layer 11 as the surface of the upper surface-covering rubber layer 2 is formed of at least the rubber composition of the present invention. The rubber composition of the present invention may also be used to form the outer layer 11 and the inner layer 12. The inner layer 12 may be an adhesive layer for adhering the reinforcing layer 3 and the outer layer 11.
The method for producing the conveyor belt of the present invention is not particularly limited. For example, a conventionally known production method is mentioned. Specifically, there is a method of manufacturing the conveyor belt of the present invention by first molding the rubber composition of the present invention for the lower surface-coated rubber layer and the rubber composition of the present invention for the upper surface-coated rubber layer into sheets, respectively, and then laminating the sheets of the rubber composition for the upper surface-coated rubber layer, the reinforcing layer and the sheets of the composition of the present invention in this order, and pressurizing the resultant laminate at a temperature of 150 to 170 ℃ for 10 to 60 minutes. The sheet of the other 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 may be used as an air-levitation conveyor belt.
Examples
The present invention will be specifically described with reference to the following examples. However, the present invention is not limited thereto.
Manufacturing of rubber composition
The components in table 1 below were used in the compositions (parts by mass) shown in the table, and these were mixed with a stirrer to prepare a rubber composition.
Evaluation
The following evaluations were performed using the respective 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 at a surface pressure of 3.0MPa using a press molding machine at 150℃to produce vulcanized rubber having a thickness of 10 mm. The vulcanized rubber was cut into pieces of 10mm in the longitudinal direction and 10mm in the transverse direction and 10mm in the thickness and the vulcanized rubber was measured to prepare a vulcanized rubber test piece.
Next, the vulcanized rubber test piece manufactured 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 pressed against 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 equation to calculate the dynamic friction coefficient.
Coefficient of dynamic friction (μk) =horizontal load/vertical load
(Evaluation criterion)
In the present invention, the dynamic friction coefficient is set to 0.5 μk or less, and the low friction property is excellent.
On the other hand, when the dynamic friction coefficient exceeds 0.5. Mu.k, the low friction property was evaluated as poor.
The lower the dynamic friction coefficient is, the more excellent the low friction property is, and the lower the driving resistance can be.
< Low tackiness >)
(Evaluation method)
The sample in which the vulcanized rubber test piece was pressed against the iron plate after the horizontal load measurement was used, and a load cell was provided for the vulcanized rubber test piece of the sample, and the vulcanized rubber test piece (sample) was lifted upward, whereby the peel strength at the time of peeling the vulcanized rubber test piece from the iron plate was measured.
(Evaluation criterion)
In the present invention, the peel strength is set to be 1.0kgf or less, and the low adhesion is excellent. The lower the peel strength is, the more excellent the low adhesion is, and the driving resistance can be reduced.
On the other hand, when the peel strength exceeds 1.0kgf, the low adhesion was evaluated as poor.
< Aging resistance >
(Production of test piece)
First, each rubber composition produced as described above was vulcanized for 30 minutes at a surface pressure of 3.0MPa using a press molding machine at 148℃to produce a vulcanized sheet having a thickness of 2 mm. From this sheet, a test piece (initial test piece) in the form of a JIS No. 3 dumbbell was punched.
Next, a heat aging test was performed in which each of the initial test pieces manufactured as described above was left to stand at 70 ℃ for 168 hours, to obtain heat aging-resistant test pieces.
(Evaluation method)
Aging resistance 1 (ΔEB)
With respect to each of the initial test pieces and each of the heat aging-resistant test pieces produced as described above, the test piece was subjected to the test according to JIS K6251:2017, under the conditions of 25℃and a tensile speed of 500 mm/min, the elongation at break (initial EB) [% ] of each initial test piece and the elongation at break (aging-resistant EB) [% ] of each test piece after heat aging resistance were measured.
The Δeb (%) was calculated by substituting each initial EB and each aging-resistant EB obtained as described above into the following formula.
Δeb (%) = (EB-initial EB after aging resistance)/initial eb×100
Aging resistance 2 (ΔHS)
Regarding each of the initial test pieces and each of the heat aging-resistant test pieces produced as described above, the test piece was subjected to the test according to JIS K6253-3:2012, a type a durometer hardness test was performed at 25 ℃ to measure the hardness of each initial test piece (initial HS) and the hardness of each heat aging resistant test piece (aging resistant hardness).
The Δhs was calculated by substituting the initial HS and the aging-resistant HS obtained as described above into the following equation.
Δhs=post aging HS-initial HS
(Evaluation criterion of aging resistance)
In the present invention, when the absolute value of Δeb is 20 or less and the absolute value of Δhs is less than 5, the aging resistance (thermal aging resistance) is excellent.
The smaller the absolute value of Δeb is, the smaller the absolute value of Δhs is, and/or the smaller the absolute value of Δhs is, the more excellent the aging resistance (heat aging resistance) is.
On the other hand, when the absolute value of Δeb exceeds 20, or when the absolute value of Δhs is 5 or more, it is evaluated that the aging resistance (heat aging resistance) is poor.
< Flame retardance >)
(Evaluation method)
A cloth layer conveyor rubber belt (test piece) was produced using each of the rubber compositions produced as described above as a cover rubber layer. In the above production, vulcanization was carried out by press vulcanization at 150℃for 30 minutes.
Using 3 each of the test pieces manufactured as described above, the test piece was manufactured in accordance with JIS K6324:2013, performing a flame retardancy test, measuring the duration (seconds) of the flame of each test piece, and obtaining an average value (average value of 3) of the duration of the flame of each test piece.
(Evaluation criterion)
In the present invention, regarding the duration of flame, the flame is carried out in accordance with JIS K6324: the flame retardancy grade 3 of 2013 was evaluated as excellent when the average value of the duration of flame of each test piece obtained as described above was 60 seconds or less.
The flame resistance is more excellent as the average value of the duration of the flame is less than 60 seconds.
On the other hand, when the average value of the duration of the flame exceeds 60 seconds, the flame retardancy was evaluated as poor.
< Processability >
(Evaluation method)
Each rubber composition (unvulcanized) produced as described above was prepared in accordance with JIS K6300-2:2001 "unvulcanized gaulin-physical Properties-part 2: the vibration type vulcanization test machine よ was used to determine the vulcanization characteristics of the rubber (unvulcanized rubber-physical characteristics-part 2: method for determining vulcanization characteristics by vibration type vulcanization test machine) ", and a vulcanization curve was measured with the obtained torque as the vertical axis and the vulcanization time as the horizontal axis at a temperature of 150℃using a rotor-free vulcanization test machine as the rheometer. From the resulting cure profile, a maximum value M H and a minimum value M L of torque are obtained.
(Evaluation criterion)
The difference between the maximum value M H and the minimum value M L obtained as described above was set to M E. The time to reach a torque of M L+ME ×0.95 is set to T95.
Each T95 obtained as described above is represented by an index in which T95 of comparative example 7 is set to 1.0.
In the present invention, when the index is 3.0 or less, it means that the processability (vulcanization rate) is excellent. The smaller the index is 3.0, the more excellent the workability is.
On the other hand, when the index exceeds 3.0, the workability is poor.
TABLE 1
TABLE 2
TABLE 3
Details of the components shown in table 1 are as follows.
< Rubber component >
NR: natural rubber (RSS # 3)
SBR: styrene-butadiene rubber (Nipol 1502, manufactured by zeon, non-oil filled)
BR: butadiene rubber (Nipol BR1220, manufactured by zeon)
< Carbon black >
ISAF grade carbon black: n 2SA120m2/g
HAF grade carbon black: n 2SA80m2/g
SRF grade carbon black: n 2SA27m2/g
< Flame retardant >)
Chlorinated paraffin: and d 70S, in the chemical industry. The chlorine content was 70 mass% in chlorinated paraffin
Antimony trioxide: PATOX-M manufactured by Japanese concentrate Co
Polyethylene: high molecular weight polyethylene. The weight average molecular weight is 200 ten thousand, and the average particle diameter is 30 mu m. Trade name of Santalin XM220, manufactured by Sanjing chemical Co., ltd.
< Oil >)
Oil: aromatic oil (A-OMIX, sanzhu oil chemical industry Co., ltd.) (C A) 20 mass% or more
< Vulcanizing agent/vulcanization accelerator >
Sulfur: micro sulfur powder (manufactured by Fine well chemical industry Co., ltd.)
Vulcanization accelerator NS: is made of a clay NS-P (manufactured by Dain chemical industry Co., ltd.)
Vulcanization accelerator TT: fan's seta-TT (manufactured by Sanxin chemical industry Co., ltd.)
As is clear from the results shown in Table 1, comparative example 1, which does not contain chlorinated paraffin and antimony trioxide, is inferior in aging resistance and flame retardancy.
Comparative examples 2 to 4 having a small carbon black content have poor low friction properties. The low tackiness of comparative example 2 was also poor. The processability of comparative examples 3 to 4 was also poor.
Comparative example 5 having the chlorinated paraffin content less than the prescribed range is poor in flame retardancy.
Comparative example 6 having the chlorinated paraffin content more than the prescribed range was poor in workability. The low tackiness of comparative example 6 was also poor.
Comparative example 7, which does not contain chlorinated paraffin and antimony trioxide, is poor in aging resistance and processability.
In contrast, the rubber composition of the present invention is excellent in flame retardancy, low friction, processability and aging resistance. The rubber composition of the present invention is also excellent in low tackiness.
Description of symbols
1: Conveying belt
2: The upper surface is covered with a rubber layer
3: Enhancement layer
4: Rubber layer with lower surface covered
5: Surface of the body
11. 16: An outer layer
12. 15: An inner layer.
Claims (6)
1. A rubber composition for an air-suspended conveyor belt cover rubber, comprising:
Comprises at least a rubber component of natural rubber and styrene-butadiene rubber,
Carbon black,
Antimony trioxide,
Chlorinated paraffin
The oil is used as a starting material for the oil,
The content of the carbon black is 75 parts by mass or more relative to 100 parts by mass of the rubber component,
The content of the chlorinated paraffin is 15 to 25 parts by mass relative to 100 parts by mass of the rubber component,
The content of the oil is 15 to 33 parts by mass based on 100 parts by mass of the rubber component,
The content of the natural rubber is 10 to 60 mass% of the rubber component,
The content of the styrene-butadiene rubber is 40 to 70 mass percent of the rubber component,
The content of the antimony trioxide is 1 to 10 parts by mass based on 100 parts by mass of the rubber component.
2. The rubber composition according to claim 1, wherein the content of the carbon black is 75 parts by mass or more and 100 parts by mass or less relative to 100 parts by mass of the rubber component.
3. The rubber composition according to claim 1, wherein the carbon black comprises carbon black having a nitrogen adsorption specific surface area of 70m 2/g or more.
4. The rubber composition according to claim 1, wherein the carbon black comprises carbon black A having a nitrogen adsorption specific surface area of 100 to 150m 2/g and carbon black B having a nitrogen adsorption specific surface area of 70 to 90m 2/g.
5. The rubber composition according to claim 1, further comprising polyethylene.
6. An air-suspended conveyor belt having a cover rubber layer formed using the rubber composition according to any one of claims 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021143170A JP2023036235A (en) | 2021-09-02 | 2021-09-02 | Rubber composition for air floating type conveyor belt cover rubber |
| JP2021-143170 | 2021-09-02 |
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| CN115746414A CN115746414A (en) | 2023-03-07 |
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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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Patent 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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