CN101362841B - High wear-resistant rubber for slurry pump and preparation method thereof - Google Patents
High wear-resistant rubber for slurry pump and preparation method thereof Download PDFInfo
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- CN101362841B CN101362841B CN2008102007692A CN200810200769A CN101362841B CN 101362841 B CN101362841 B CN 101362841B CN 2008102007692 A CN2008102007692 A CN 2008102007692A CN 200810200769 A CN200810200769 A CN 200810200769A CN 101362841 B CN101362841 B CN 101362841B
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 31
- 239000002002 slurry Substances 0.000 title claims abstract description 10
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 229920006173 natural rubber latex Polymers 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
- 229920000126 latex Polymers 0.000 claims abstract description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000005864 Sulphur Substances 0.000 claims abstract description 4
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 claims description 11
- 235000021240 caseins Nutrition 0.000 claims description 11
- 239000005018 casein Substances 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000004816 latex Substances 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 9
- 244000043261 Hevea brasiliensis Species 0.000 abstract description 6
- 229920003052 natural elastomer Polymers 0.000 abstract description 6
- 229920001194 natural rubber Polymers 0.000 abstract description 6
- 238000002156 mixing Methods 0.000 abstract description 5
- 239000002270 dispersing agent Substances 0.000 abstract description 2
- 239000000839 emulsion Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 2
- 239000000377 silicon dioxide Substances 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract 2
- 230000003044 adaptive effect Effects 0.000 abstract 1
- 208000037805 labour Diseases 0.000 abstract 1
- 239000000758 substrate Substances 0.000 abstract 1
- 102000011632 Caseins Human genes 0.000 description 9
- 108010076119 Caseins Proteins 0.000 description 9
- 239000002893 slag Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- MHKLKWCYGIBEQF-UHFFFAOYSA-N 4-(1,3-benzothiazol-2-ylsulfanyl)morpholine Chemical compound C1COCCN1SC1=NC2=CC=CC=C2S1 MHKLKWCYGIBEQF-UHFFFAOYSA-N 0.000 description 6
- 239000012752 auxiliary agent Substances 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 4
- 229940021722 caseins Drugs 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000004513 sizing Methods 0.000 description 4
- 238000001238 wet grinding Methods 0.000 description 4
- 230000003245 working effect Effects 0.000 description 3
- PDQAZBWRQCGBEV-UHFFFAOYSA-N Ethylenethiourea Chemical compound S=C1NCCN1 PDQAZBWRQCGBEV-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005987 sulfurization reaction Methods 0.000 description 2
- OPNUROKCUBTKLF-UHFFFAOYSA-N 1,2-bis(2-methylphenyl)guanidine Chemical compound CC1=CC=CC=C1N\C(N)=N\C1=CC=CC=C1C OPNUROKCUBTKLF-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FLVIGYVXZHLUHP-UHFFFAOYSA-N N,N'-diethylthiourea Chemical compound CCNC(=S)NCC FLVIGYVXZHLUHP-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- MNOILHPDHOHILI-UHFFFAOYSA-N Tetramethylthiourea Chemical compound CN(C)C(=S)N(C)C MNOILHPDHOHILI-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000004359 castor oil Substances 0.000 description 1
- 235000019438 castor oil Nutrition 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- REQPQFUJGGOFQL-UHFFFAOYSA-N dimethylcarbamothioyl n,n-dimethylcarbamodithioate Chemical compound CN(C)C(=S)SC(=S)N(C)C REQPQFUJGGOFQL-UHFFFAOYSA-N 0.000 description 1
- 238000010130 dispersion processing Methods 0.000 description 1
- AUZONCFQVSMFAP-UHFFFAOYSA-N disulfiram Chemical compound CCN(CC)C(=S)SSC(=S)N(CC)CC AUZONCFQVSMFAP-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- HOEFWOBLOGZQIQ-UHFFFAOYSA-N morpholin-4-yl morpholine-4-carbodithioate Chemical compound C1COCCN1C(=S)SN1CCOCC1 HOEFWOBLOGZQIQ-UHFFFAOYSA-N 0.000 description 1
- ILSQBBRAYMWZLQ-UHFFFAOYSA-N n-(1,3-benzothiazol-2-ylsulfanyl)-n-propan-2-ylpropan-2-amine Chemical compound C1=CC=C2SC(SN(C(C)C)C(C)C)=NC2=C1 ILSQBBRAYMWZLQ-UHFFFAOYSA-N 0.000 description 1
- 229910052755 nonmetal Inorganic materials 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
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000012763 reinforcing filler Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229960001866 silicon dioxide Drugs 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- PYODKQIVQIVELM-UHFFFAOYSA-M sodium;2,3-bis(2-methylpropyl)naphthalene-1-sulfonate Chemical compound [Na+].C1=CC=C2C(S([O-])(=O)=O)=C(CC(C)C)C(CC(C)C)=CC2=C1 PYODKQIVQIVELM-UHFFFAOYSA-M 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 description 1
- GTZCVFVGUGFEME-HNQUOIGGSA-N trans-aconitic acid Chemical compound OC(=O)C\C(C(O)=O)=C/C(O)=O GTZCVFVGUGFEME-HNQUOIGGSA-N 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 229910000406 trisodium phosphate Inorganic materials 0.000 description 1
- 235000019801 trisodium phosphate Nutrition 0.000 description 1
- RKQOSDAEEGPRER-UHFFFAOYSA-L zinc diethyldithiocarbamate Chemical compound [Zn+2].CCN(CC)C([S-])=S.CCN(CC)C([S-])=S RKQOSDAEEGPRER-UHFFFAOYSA-L 0.000 description 1
Landscapes
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
The invention relates to a high-wear resistance rubber used for a slurry pump and a preparation method thereof. The invention includes the components counted according to the following weight portions: 100 portions/ solids content of natural rubber latex; 0 to 10 portions of ZnO; 0 to 5 portions of accelerant; 0 to 5 portions of sulphur; 0 to 100 portions of silicon dioxide; 0.5 to 5 portions of dispersant. In the invention, the natural rubber latex is used as a substrate; the addition agents are directly added into the rubber latex under rubber latex state; dispersing processing is carried out under the colloidal state; then emulsion breaking is carried out on the mixture; the high-wear resistance rubber product is manufactured after the mixture is dried and vulcanized. A mixing process is not needed during the preparation process, thus reducing the investments on a mixing device, energy sources and labors; the operation is simple, convenient and effective; energies are saved; besides, the prepared product maintains the molecular structure of the natural rubber and has the characteristics of high wear resistance and excellent performances, thus being adaptive to manufacturing overcurrent parts of the slurry pump in particular.
Description
Technical field
The present invention relates to a kind of high wear-resistant rubber, particularly relate to a kind of high wear-resistant rubber for slurry pump and preparation method thereof.
Background technology
Rubber slag stock pump is applied to mine industry and comprises in the industries such as black mine (iron ore), nonferrous metal mine, gold mine, chemical mine, colliery and metallurgy, smelting, non-metal mine, chemical fertilizer, cement, pottery, is the major equipment of carrying the slag slurry of solid particles, high density.Along with the development of the modernization of industry, the slag stock pump obtains application more and more widely in the mine produces, and especially aspect configuration of the equipment in the technological process of production and the remote conveying, the use of slag stock pump has all demonstrated its technical superiority and vital role.The flow passage part of rubber slag stock pump is all made by rubber, so the wear resistance of elastomeric material directly influences the work-ing life of rubber slag stock pump.
Abrasion be because mechanical effect and (or) a kind of material of on the solid friction surface, producing of chemical reaction (comprising reactions such as thermochemistry, electrochemistry and power chemistry) phenomenon of loss gradually, this loss mainly show as the solid surface size and (or) change of shape.The material abrasion are a kind of ten minutes complex phenomena, it not only depends on the character of material itself, but also be a progressive micro dynamic course with time varying characteristic, also be subjected to interacting and interacting of many-sided factor in the tribology system (comprising environment) at its place simultaneously.For this reason, must relate to the problem of multiple subjects such as physics, chemistry, mechanics, thermodynamics, Materials science and mechanical engineering and science and technology field to abrasive research.
Natural rubber is indispensable a kind of important starting material in national economy and the people's lives, therefore improves the wear resistance of rubber item and becomes the important topic that people extremely are concerned about work-ing life.In order to study rubber abrasion mechanism, and then the work-ing life of prediction rubber item, many investigators adopt diverse ways to reduce the abrasion of rubber item, as adding the little super-normal structure black of reinforcing filler, particularly particle diameter, white carbon black etc.Generally speaking, rubber item is to use under the exsiccant environment, and the slag stock pump is to use under aqueous environment, the molecular structure of discovering natural rubber under the condition of wet-milling is very big to abrasive influence, promptly the molecular structure of natural rubber is destroyed in the course of processing of rubber item must be few more, and the wet abrasive resistance of rubber item can be good more.
Summary of the invention
Technical problem to be solved by this invention provides a kind of high wear-resistant rubber for slurry pump and preparation method thereof, to address the above problem.High wear-resistant rubber of the present invention has kept the molecular structure of natural rubber, superior performance, and the preparation method is simple, convenient, energy-conservation, and prepared high wear-resistant rubber is applied to slag stock pump flow passage part.
For achieving the above object, the present invention by the following technical solutions:
A kind of high wear-resistant rubber for slurry pump comprises following component in mass fraction:
Natural rubber latex: 100 parts/latex solid content
ZnO:0～10 part
Promotor: 0～5 part
Sulphur: 0～5 part
Silicon-dioxide: 0～100 part
Dispersion agent: 0.5～5 part
The solid content of described natural rubber latex is 10wt%～70wt%.
Described promotor is one or more combinations among M, DM, MZ, CZ, NOBS, AZ, DZ, NS, DIBS, MDB, OTOS, TMTM, TMTD, TETD, TRA, ZDMC, ZDC, EZ, ZDEC, BZ, PX, D, DOTG, NA-22, ETU, DETU, TMTU, H, the AA.
Described dispersion agent is one or more combinations in sulfonated castor oil, Nekal BX, diffusion agent N F, Dasada sodium salt, trisodium phosphate, polyvinyl alcohol, sodium sulfonate, dispersing agent MF, the casein.
A kind of preparation method of high wear-resistant rubber for slurry pump is a matrix with the natural rubber latex, under the state of latex various auxiliary agents addings is dispersed in the natural rubber latex, becomes rubber item through prepared such as breakdown of emulsion, drying, sulfurations then.
Beneficial effect:
The present invention directly joins various auxiliary agents in the latex, under the colloidal state state, carry out dispersion processing, not only do not need through mixing process, reduced mixing facilities, the energy and labor force's input, can reach simple, convenient, energy-conservation, purpose efficiently, and kept the molecular structure of natural rubber, and prepare the high wear-resistant rubber goods of superior performance, be specially adapted to make the flow passage part of slag stock pump.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Embodiment 1
Traditional technology sizing material basic recipe comprises following component in mass fraction:
100 parts of NR
4 parts of ZnO
2 parts of stearic acid
1.2 parts of NOBS
0.25 part of ZDC
1.2 parts of S
(152 * 305mm) go up the preparation rubber unvulcanizate to traditional technology, and the roller speed ratio is 1:1.42 with 160 pairs of roller mills of φ in experiment; Mixing by selected prescription with the order of addition(of ingredients) of rubber, small powder and vulcanizing agent, after the slice, adopt vulcanizing press to press sulfurizing time sulfuration preparation sample.
The emulsion method basic recipe comprises following component in mass fraction:
166.7 parts of natural rubber latexes (solid content 60%)
4 parts of ZnO
1.2 parts of NOBS
0.25 part of ZDC
1.2 parts of S
5 parts of caseins
Various auxiliary agents and casein are added to the water, at room temperature stir 12h, then it is joined in the natural rubber latex,, put into baking oven dry 4h under 80 ℃ then, vulcanize 10min down at 130 ℃ and make product at 60 ℃ of following supersound process 12h with sand mill.
By the testing method that latest national standards GB/T1701-2001, GB/T529-1999, GB/T1681-1991, GB/T9867-1988 provide the properties of rubber of above-mentioned two kinds of prescription gained is tested, its physical and mechanical properties test result contrast sees Table one.
Table one
Embodiment 2
The sizing material basic recipe comprises following component in mass fraction:
166.7 parts of natural rubber latexes (solid content 60%)
10 parts of ZnO
5 parts of NOBS
5 parts of S
5 parts of caseins
Various auxiliary agents and casein are added to the water, at room temperature stir 12h, then it is joined in the natural rubber latex,, put into baking oven dry 4h under 80 ℃ then, vulcanize 10min down at 130 ℃ and make product at 60 ℃ of following supersound process 12h with sand mill.
By the testing method that latest national standards GB/T1701-2001, GB/T529-1999, GB/T1681-1991, GB/T9867-1988 provide the properties of rubber of above-mentioned two kinds of prescription gained is tested, its physical and mechanical properties test result sees Table two.
Table two
| Tensile strength, MPa | 29.1 |
| Elongation at break, % | 702 |
| Tear strength, KN/m | 12.9 |
| Rebound resilience, % | 77.3 |
| The wet-milling consumption, cm 3 | 0.02361 |
Embodiment 3
The sizing material basic recipe comprises following component in mass fraction:
166.7 parts of natural rubber latexes (solid content 60%)
10 parts of ZnO
5 parts of NOBS
5 parts of S
5 parts of caseins
SiO
250 parts
Various auxiliary agents and casein are added to the water, at room temperature stir 12h, then it is joined in the natural rubber latex,, put into baking oven dry 4h under 80 ℃ then, vulcanize 10min down at 130 ℃ and make product at 60 ℃ of following supersound process 12h with sand mill.
By latest national standards GB/T1701-2001, GB/T529-1999, GB/T1681-1991, GB/T
The testing method that 9867-1988 provides is tested the properties of rubber of above-mentioned two kinds of prescription gained, and its physical and mechanical properties test result sees Table three.
Table three
| Tensile strength, MPa | 30.8 |
| Elongation at break, % | 621 |
| Tear strength, KN/m | 96.3 |
| Rebound resilience, % | 56.9 |
| The wet-milling consumption, cm 3 | 0.03125 |
Embodiment 4
The sizing material basic recipe comprises following component in mass fraction:
166.7 parts of natural rubber latexes (solid content 60%)
10 parts of ZnO
5 parts of NOBS
5 parts of S
5 parts of caseins
SiO
230 parts
Various auxiliary agents and casein are added to the water, at room temperature stir 12h with sand mill, then it is joined in the natural rubber latex, the ultrasonic 12h of place under 60 ℃ puts into baking oven dry 4h under 80 ℃ then, vulcanizes 10min down at 130 ℃ and makes product.
By the testing method that latest national standards GB/T1701-2001, GB/T529-1999, GB/T1681-1991, GB/T9867-1988 provide the properties of rubber of above-mentioned two kinds of prescription gained is tested, its physical and mechanical properties test result sees Table four.
Table four
| Tensile strength, MPa | 29.6 |
| Elongation at break, % | 710 |
| Tear strength, KN/m | 81.9 |
| Rebound resilience, % | 72.3 |
| The wet-milling consumption, cm 3 | 0.02743 |
Claims (1)
1. high wear-resistant rubber for slurry pump is characterized in that: comprise following component in mass fraction:
Natural rubber latex: 166.7 parts/latex, solid content 60wt%;
ZnO:4 part;
Accelerant N OBS:1.2 part;
Promotor ZDC:0.25 part;
Sulphur: 1.2 parts;
Dispersion agent casein: 5 parts;
ZnO, accelerant N OBS, promotor ZDC, sulphur and casein are added to the water, at room temperature stir 12h, then it is joined in the natural rubber latex, at 60 ℃ of following supersound process 12h with sand mill, put into baking oven dry 4h under 80 ℃ then, vulcanize 10min down at 130 ℃ and make product.
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| CN101914229B (en) * | 2010-08-24 | 2011-10-12 | 中国热带农业科学院农产品加工研究所 | Method for preparing kieselguhr/natural rubber composite material |
| CN103756038B (en) * | 2014-01-24 | 2015-12-02 | 芜湖耐得胶管阀业有限公司 | A kind of Pulp pump abrasive rubber and production technique thereof |
| CN104311906B (en) * | 2014-11-12 | 2017-11-10 | 海南天然橡胶产业集团股份有限公司 | A kind of preparation method of tire belt white carbon/NR masterbatch |
| CN107698822A (en) * | 2017-11-21 | 2018-02-16 | 河北技投机械设备有限公司 | A kind of abrasive rubber and its preparation method and application |
| CN111536049B (en) * | 2020-05-22 | 2021-06-25 | 江西斯米克陶瓷有限公司 | Conveying device for ceramic product production |
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| CN1550516A (en) * | 2003-01-27 | 2004-12-01 | �����ŵ�˹רҵ��˾ | Natural rubber composites containing smectite clay and uses thereof |
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| CN1550516A (en) * | 2003-01-27 | 2004-12-01 | �����ŵ�˹רҵ��˾ | Natural rubber composites containing smectite clay and uses thereof |
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