CN111732762A - Formula capable of reducing dynamic heat generation of triangular belt primer - Google Patents
Formula capable of reducing dynamic heat generation of triangular belt primer Download PDFInfo
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- CN111732762A CN111732762A CN202010479111.0A CN202010479111A CN111732762A CN 111732762 A CN111732762 A CN 111732762A CN 202010479111 A CN202010479111 A CN 202010479111A CN 111732762 A CN111732762 A CN 111732762A
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- 230000020169 heat generation Effects 0.000 title claims abstract description 23
- 229920001971 elastomer Polymers 0.000 claims abstract description 33
- 239000005060 rubber Substances 0.000 claims abstract description 33
- 239000006229 carbon black Substances 0.000 claims abstract description 31
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 14
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 12
- 239000011593 sulfur Substances 0.000 claims abstract description 12
- 230000003712 anti-aging effect Effects 0.000 claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 6
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 6
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000012763 reinforcing filler Substances 0.000 claims abstract description 6
- 239000008117 stearic acid Substances 0.000 claims abstract description 6
- 239000011787 zinc oxide Substances 0.000 claims abstract description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 12
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 claims description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 9
- 244000043261 Hevea brasiliensis Species 0.000 claims description 8
- 229920003052 natural elastomer Polymers 0.000 claims description 8
- 229920001194 natural rubber Polymers 0.000 claims description 8
- 239000005062 Polybutadiene Substances 0.000 claims description 7
- 229920002857 polybutadiene Polymers 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- OUBMGJOQLXMSNT-UHFFFAOYSA-N N-isopropyl-N'-phenyl-p-phenylenediamine Chemical compound C1=CC(NC(C)C)=CC=C1NC1=CC=CC=C1 OUBMGJOQLXMSNT-UHFFFAOYSA-N 0.000 claims description 5
- 239000004902 Softening Agent Substances 0.000 claims description 5
- AFZSMODLJJCVPP-UHFFFAOYSA-N dibenzothiazol-2-yl disulfide Chemical compound C1=CC=C2SC(SSC=3SC4=CC=CC=C4N=3)=NC2=C1 AFZSMODLJJCVPP-UHFFFAOYSA-N 0.000 claims description 5
- 239000003208 petroleum Substances 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 5
- 239000010692 aromatic oil Substances 0.000 claims description 4
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000004898 kneading Methods 0.000 claims description 3
- DEQZTKGFXNUBJL-UHFFFAOYSA-N n-(1,3-benzothiazol-2-ylsulfanyl)cyclohexanamine Chemical compound C1CCCCC1NSC1=NC2=CC=CC=C2S1 DEQZTKGFXNUBJL-UHFFFAOYSA-N 0.000 claims description 3
- 238000004073 vulcanization Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 230000003014 reinforcing effect Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 239000003963 antioxidant agent Substances 0.000 description 3
- 230000003078 antioxidant effect Effects 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- STSDHUBQQWBRBH-UHFFFAOYSA-N n-cyclohexyl-1,3-benzothiazole-2-sulfonamide Chemical compound N=1C2=CC=CC=C2SC=1S(=O)(=O)NC1CCCCC1 STSDHUBQQWBRBH-UHFFFAOYSA-N 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
A formula capable of reducing dynamic heat generation of a triangular belt primer belongs to the technical field of triangular belt preparation, and mainly comprises the following components in parts by weight: 100 parts of rubber, 1-3 parts of accelerator, 2-3.5 parts of sulfur, 1.5-3 parts of stearic acid, 5-8 parts of zinc oxide, 50-90 parts of carbon black, 0-30 parts of reinforcing filler, 2-4 parts of anti-aging agent and 2-8 parts of softener; according to the invention, through designing the rubber material and designing the vulcanization system and the reinforcing filling system, the dynamic temperature rise is reduced, and the fatigue life of the V-belt is prolonged.
Description
Technical Field
The invention belongs to the technical field of transmission belts, and particularly relates to a formula capable of reducing dynamic heat generation of a base rubber of a V-belt.
Background
The wrapping cloth V belt has high cost performance, the manufacturing process is simpler than that of a trimming V belt, and the wrapping cloth V belt still occupies the main market of the transmission belt at home and abroad at present, so that the improvement of the dynamic performance of the wrapping cloth V belt to ensure the market competitiveness of enterprises is particularly important.
The dynamic performance of the V-belt is mainly considered from the aspects of low flex cracking and low dynamic compression temperature rise, and the dynamic performance of the V-belt is researched from the direction of loss factors in recent years due to large judgment error of a flex cracking test by naked eyes. The research shows that the fatigue life of the V-belt has a great relationship with the temperature, the fatigue life is reduced by 35 to 45 percent when the environmental temperature is increased by 10 degrees, and the fatigue life of the V-belt is directly determined by the dynamic temperature rise.
Disclosure of Invention
The invention aims to provide a formula capable of reducing dynamic heat generation of a triangular belt primer so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a formula capable of reducing dynamic heat generation of a triangular belt primer mainly comprises the following components in parts by weight: 100 parts of rubber, 1-3 parts of accelerator, 2-3.5 parts of sulfur, 1.5-3 parts of stearic acid, 5-8 parts of zinc oxide, 50-90 parts of carbon black, 0-30 parts of reinforcing filler, 2-4 parts of anti-aging agent and 2-8 parts of softener.
Further, the rubber comprises any one or combination of more of natural rubber, styrene butadiene rubber and butadiene rubber.
Furthermore, the reinforcing filler is calcium carbonate.
Further, the accelerators include N-cyclohexyl-2-benzothiazolesulfenamide and 2, 2' -dithiodibenzothiazole.
Further, the carbon black includes any one of or a combination of N326 carbon black and N550 carbon black.
Further, the anti-aging agent comprises octylated diphenylamine and anti-aging agent 4010NA
Further, the softening agent includes petroleum resin and aromatic oil.
A preparation method of a formula capable of reducing dynamic heat generation of a triangular belt primer comprises the following steps:
the method comprises the following steps: putting 65 parts of natural rubber, 25 parts of butadiene styrene rubber, 10 parts of butadiene rubber, 12.5 parts of N326 carbon black and 22.5 parts of N550 carbon black into an internal mixer for kneading for 50S;
step two: then the rest 12.5 parts of N326 carbon black, 22.5 parts of N550 carbon black and 20 parts of calcium carbonate are put into the internal mixer again for mixing for 40S;
step three: adding the rest components except 2.8 parts of sulfur into the internal mixer again to mix until the temperature reaches 130 ℃, and then discharging rubber to the first open mill;
step four: mixing the mixed rubber obtained in the third step on a first open mill, cooling to 110 ℃, adding 2.8 parts of sulfur, carrying out rubber turning and mixing for 120S, and discharging the rubber to a second open mill;
step five: and C, performing rubber turning and mixing on the mixed rubber obtained in the step four in a second open mill for 140 seconds, and discharging the mixed rubber to a third open mill for sheet discharging.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, through designing the rubber material and designing the vulcanization system and the reinforcing filling system, the dynamic temperature rise is reduced, and the fatigue life of the triangular belt is prolonged.
Detailed Description
The technical solutions in the embodiments of the present invention will be described below clearly and completely, and obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Example (b):
the formula capable of reducing dynamic heat generation of the base rubber of the V-belt comprises, by weight, 65 parts of natural rubber, 25 parts of styrene butadiene rubber, 10 parts of butadiene rubber, 25 parts of N326 carbon black, 45 parts of N550 carbon black, 20 parts of calcium carbonate, 7 parts of zinc oxide, 2 parts of stearic acid, 2 parts of a promoter, 2.8 parts of sulfur, 3.5 parts of an anti-aging agent and 5 parts of a softener.
In this example, calcium carbonate, N326 carbon black and N550 carbon black constitute a reinforcing filler system, and the calcium carbonate is used as a filler to reduce the actual production cost, and the use of both N326 carbon black and N550 carbon black realizes reinforcement of the primer and a reduction in temperature rise.
In the embodiment, the concrete components of the softening agent are 4 parts of petroleum resin and 1 part of aromatic oil.
Wherein, the 2 parts of the accelerant are 1.5 parts of N-cyclohexyl-2-benzothiazole sulfonamide and 0.5 part of 2, 2' -dithiodibenzothiazole; the two components and sulfur form a vulcanization system, so that the dynamic modulus and the static modulus are improved, and the hysteresis damage and the heat generation are reduced.
In addition, in this example, the antioxidant comprises 2 parts of octylated diphenylamine and 1.5 parts of antioxidant 4010 NA.
The formula is processed, and the specific preparation process comprises the following steps:
the method comprises the following steps: putting 65 parts of natural rubber, 25 parts of butadiene styrene rubber, 10 parts of butadiene rubber, 12.5 parts of N326 carbon black and 22.5 parts of N550 carbon black into an internal mixer for kneading for 50S;
step two: then the rest 12.5 parts of N326 carbon black, 22.5 parts of N550 carbon black and 20 parts of calcium carbonate are put into an internal mixer for mixing for 40S;
step three: adding the rest components except 2.8 parts of sulfur into the internal mixer again to mix until the temperature reaches 130 ℃, and then discharging rubber to the first open mill;
step four: mixing the mixed rubber obtained in the third step on a first open mill, cooling to 110 ℃, adding 2.8 parts of sulfur, carrying out rubber turning and mixing for 120S, and discharging the rubber to a second open mill;
step five: and C, performing rubber turning and mixing on the mixed rubber obtained in the step four in a second open mill for 140 seconds, and discharging the mixed rubber to a third open mill for sheet discharging.
In the preparation method, the continuity among links in the preparation process is ensured by increasing the number of the open mills, the working efficiency of each device is improved, the redundancy is reduced, the production efficiency is effectively enhanced, and the energy consumption is saved.
Comparative example 1:
the formula capable of reducing dynamic heat generation of the base rubber of the V-belt comprises, by weight, 65 parts of natural rubber, 35 parts of styrene butadiene rubber, 45 parts of N326 carbon black, 25 parts of N550 carbon black, 20 parts of calcium carbonate, 7 parts of zinc oxide, 2.5 parts of stearic acid, 2.3 parts of an accelerator, 2.5 parts of sulfur, 3.0 parts of an anti-aging agent and 5.5 parts of a softener.
In the embodiment, the specific components of the antioxidant are octylated diphenylamine 1.5 parts and antioxidant 4010NA 1.5 parts.
In the embodiment, the concrete components of the softening agent are 4 parts of petroleum resin and 1.5 parts of aromatic oil.
In the present embodiment, the accelerator component is specifically 1.5 parts of N-cyclohexyl-2-benzothiazole sulfonamide and 0.8 part of 2, 2' -dithiodibenzothiazole; the two and sulfur form a vulcanization system, so that the dynamic modulus and the static modulus are improved, and the hysteresis loss and the heat generation are reduced.
Comparative example 2:
the formula capable of reducing dynamic heat generation of the base rubber of the V-belt comprises, by weight, 65 parts of natural rubber, 25 parts of styrene butadiene rubber, 10 parts of butadiene rubber, 25 parts of N326 carbon black, 50 parts of N550 carbon black, 20 parts of tread reclaimed rubber, 8.5 parts of zinc oxide, 2.5 parts of stearic acid, 2.5 parts of an accelerator, 0.5 part of a scorch retarder CTP, 3.2 parts of sulfur, 3.8 parts of an anti-aging agent and 3.5 parts of a softener.
In the embodiment, the specific components of the antioxidant are 2.0 parts of octylated diphenylamine and 1.8 parts of antioxidant 4010 NA.
In the embodiment, the specific component of the softening agent is 3.5 parts of petroleum resin.
In this example, the accelerator components were specifically N-cyclohexyl-2-benzothiazolesulfenamide 1.5 parts and 2, 2' -dithiodibenzothiazole 1.0 parts.
Meanwhile, the formulation components in comparative example 1 and comparative example 2 were prepared into finished products by the preparation methods in the examples, and then the physical properties of the finished products were compared by tests, such as: hardness, tensile strength, compression temperature rise, etc.;
among them, at present, a tester specially researching the compression heat generation performance exists in China, and GB/T1687 is the compression heat generation test regulation specially related to vulcanized rubber. In the scheme, the compression heat generation test temperature is set to be 55 ℃, the stroke is 4.45mm, the compression frequency is 30HZ, and the test time is 25 min;
and (4) experimental conclusion: as can be seen from the above table, the components of the embodiment are proportioned to obtain a finished product, which is a particularly significant improvement in compression temperature rise, and the fatigue life is improved; next, by comparing the components of comparative example 1 and comparative example 2 with the components in the examples, it can be found that the components in the examples have certain cooperativity, thereby solving the problems studied by us.
In addition, the fatigue life of the V-belt using the primer is not less than 400 hours and the dynamic performance is improved according to the GB/T15328 'common V-belt fatigue test method no-torque method'.
In the description of the present invention, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features that are indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. Furthermore, the term "comprises" and any variations thereof is intended to cover non-exclusive inclusions.
The present invention has been described in terms of embodiments, and several variations and modifications can be made to the device without departing from the principles of the present invention. It should be noted that all the technical solutions obtained by means of equivalent substitution or equivalent transformation, etc., fall within the protection scope of the present invention.
Claims (8)
1. A formula capable of reducing dynamic heat generation of a triangular belt primer is characterized in that: the formula mainly comprises the following components in parts by weight: 100 parts of rubber, 1-3 parts of accelerator, 2-3.5 parts of sulfur, 1.5-3 parts of stearic acid, 5-8 parts of zinc oxide, 50-90 parts of carbon black, 0-30 parts of reinforcing filler, 2-4 parts of anti-aging agent and 2-8 parts of softener.
2. The formula for reducing the dynamic heat generation of the triangular belt primer according to claim 1, wherein the formula comprises the following components in percentage by weight: the rubber comprises any one or combination of more of natural rubber, styrene butadiene rubber and butadiene rubber.
3. The formula for reducing the dynamic heat generation of the triangular belt primer according to claim 1, wherein the formula comprises the following components in percentage by weight: the reinforcing filler is calcium carbonate.
4. The formula for reducing the dynamic heat generation of the triangular belt primer according to claim 1, wherein the formula comprises the following components in percentage by weight: the accelerators include N-cyclohexyl-2-benzothiazole sulfenamide and 2, 2' -dithiodibenzothiazole.
5. The formula for reducing the dynamic heat generation of the triangular belt primer according to claim 1, wherein the formula comprises the following components in percentage by weight: the carbon black comprises any one or combination of N326 carbon black and N550 carbon black.
6. The formula for reducing the dynamic heat generation of the triangular belt primer according to claim 1, wherein the formula comprises the following components in percentage by weight: the anti-aging agent comprises octylated diphenylamine and an anti-aging agent 4010 NA.
7. The formula for reducing the dynamic heat generation of the triangular belt primer according to claim 1, wherein the formula comprises the following components in percentage by weight: the softening agent comprises petroleum resin and aromatic oil.
8. A preparation method of a formula capable of reducing dynamic heat generation of a triangular belt primer is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: putting 65 parts of natural rubber, 25 parts of butadiene styrene rubber, 10 parts of butadiene rubber, 12.5 parts of N326 carbon black and 22.5 parts of N550 carbon black into an internal mixer for kneading for 50S;
step two: then the rest 12.5 parts of N326 carbon black, 22.5 parts of N550 carbon black and 20 parts of calcium carbonate are put into the internal mixer again for mixing for 40S;
step three: adding the rest components except 2.8 parts of sulfur into the internal mixer again, mixing until the temperature reaches 130 ℃, and then discharging rubber to the first open mill;
step four: mixing the mixed rubber obtained in the third step on a first open mill, cooling to 110 ℃, adding 2.8 parts of sulfur, carrying out rubber turning and mixing for 120S, and discharging rubber to a second open mill;
step five: and C, performing rubber turning and mixing on the mixed rubber obtained in the step four in a second open mill for 140 seconds, and discharging the mixed rubber to a third open mill for sheet discharging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010479111.0A CN111732762A (en) | 2020-05-29 | 2020-05-29 | Formula capable of reducing dynamic heat generation of triangular belt primer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010479111.0A CN111732762A (en) | 2020-05-29 | 2020-05-29 | Formula capable of reducing dynamic heat generation of triangular belt primer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111732762A true CN111732762A (en) | 2020-10-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010479111.0A Pending CN111732762A (en) | 2020-05-29 | 2020-05-29 | Formula capable of reducing dynamic heat generation of triangular belt primer |
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| Country | Link |
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| CN (1) | CN111732762A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113234263A (en) * | 2021-06-08 | 2021-08-10 | 浙江保尔力橡塑股份有限公司 | Fiber-containing primer of cloth-covered triangular belt and preparation process thereof |
| CN113667199A (en) * | 2021-09-01 | 2021-11-19 | 浙江保尔力橡塑股份有限公司 | Ultrahigh wear-resistant conveying belt and preparation process thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113234263A (en) * | 2021-06-08 | 2021-08-10 | 浙江保尔力橡塑股份有限公司 | Fiber-containing primer of cloth-covered triangular belt and preparation process thereof |
| CN113667199A (en) * | 2021-09-01 | 2021-11-19 | 浙江保尔力橡塑股份有限公司 | Ultrahigh wear-resistant conveying belt and preparation process thereof |
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Application publication date: 20201002 |