CN102190741A - Method for coagulating rubber latex - Google Patents
Method for coagulating rubber latex Download PDFInfo
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- CN102190741A CN102190741A CN 201010130406 CN201010130406A CN102190741A CN 102190741 A CN102190741 A CN 102190741A CN 201010130406 CN201010130406 CN 201010130406 CN 201010130406 A CN201010130406 A CN 201010130406A CN 102190741 A CN102190741 A CN 102190741A
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- rubber
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- 229920000126 latex Polymers 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000001112 coagulating effect Effects 0.000 title abstract description 3
- 239000004816 latex Substances 0.000 claims abstract description 71
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 10
- 230000003068 static effect Effects 0.000 claims abstract description 10
- 229920006173 natural rubber latex Polymers 0.000 claims abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 24
- 238000009833 condensation Methods 0.000 claims description 24
- 230000005494 condensation Effects 0.000 claims description 24
- 238000005189 flocculation Methods 0.000 claims description 22
- 230000016615 flocculation Effects 0.000 claims description 22
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 19
- 150000003839 salts Chemical class 0.000 claims description 18
- 239000000839 emulsion Substances 0.000 claims description 15
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 12
- 229920000459 Nitrile rubber Polymers 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 11
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 5
- 229920002857 polybutadiene Polymers 0.000 claims description 5
- 239000012266 salt solution Substances 0.000 claims description 4
- 229920013649 Paracril Polymers 0.000 claims description 3
- 229940037003 alum Drugs 0.000 claims description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 229920001084 poly(chloroprene) Polymers 0.000 claims description 2
- 238000006116 polymerization reaction Methods 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 abstract description 23
- 239000005060 rubber Substances 0.000 abstract description 23
- 239000002245 particle Substances 0.000 abstract description 22
- 239000007787 solid Substances 0.000 abstract description 18
- 239000000203 mixture Substances 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 239000012452 mother liquor Substances 0.000 abstract description 3
- 239000000725 suspension Substances 0.000 abstract description 3
- 229920006174 synthetic rubber latex Polymers 0.000 abstract description 2
- 239000000701 coagulant Substances 0.000 abstract 3
- 230000015271 coagulation Effects 0.000 abstract 2
- 238000005345 coagulation Methods 0.000 abstract 2
- 239000012535 impurity Substances 0.000 abstract 1
- 239000007921 spray Substances 0.000 abstract 1
- 239000007859 condensation product Substances 0.000 description 25
- 239000007864 aqueous solution Substances 0.000 description 14
- 239000007788 liquid Substances 0.000 description 13
- 239000000047 product Substances 0.000 description 13
- 238000005354 coacervation Methods 0.000 description 7
- 238000009826 distribution Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 239000011259 mixed solution Substances 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 239000008234 soft water Substances 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 239000000945 filler Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- 239000005862 Whey Substances 0.000 description 4
- 102000007544 Whey Proteins Human genes 0.000 description 4
- 108010046377 Whey Proteins Proteins 0.000 description 4
- 230000008030 elimination Effects 0.000 description 4
- 238000003379 elimination reaction Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000002174 Styrene-butadiene Substances 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 3
- 230000003311 flocculating effect Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000005062 Polybutadiene Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 239000000344 soap Substances 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N Acrylic acid Chemical compound OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 241001122126 Carex secta Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 244000286663 Ficus elastica Species 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 208000034189 Sclerosis Diseases 0.000 description 1
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 235000013365 dairy product Nutrition 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 235000019359 magnesium stearate Nutrition 0.000 description 1
- 239000000693 micelle Substances 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229940114930 potassium stearate Drugs 0.000 description 1
- ANBFRLKBEIFNQU-UHFFFAOYSA-M potassium;octadecanoate Chemical compound [K+].CCCCCCCCCCCCCCCCCC([O-])=O ANBFRLKBEIFNQU-UHFFFAOYSA-M 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 235000019600 saltiness Nutrition 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 210000005239 tubule Anatomy 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
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Abstract
The invention relates to a method for continuously coagulating latex with low energy consumption and high production efficiency, which adopts a tubular static mixer, rubber latex is added into a main pipe, coagulant or other auxiliary agents are added into a branch pipe in a parallel flow manner, one or more nozzles are arranged in the main pipe, and the branch pipe is preferably arranged behind the nozzles. The branch pipes can be one or more, and are respectively used as adding pipelines of coagulant or other auxiliary agents, and the branch pipes are arranged behind the spray nozzles, so that the latex and the coagulant are continuously mixed at a certain temperature and time, and the latex is continuously coagulated into a suspension mixture of solid rubber particles and coagulated mother liquor in a turbulent flow state. The rubber particles prepared by the latex coagulation method are uniform, the impurity content is low, the coagulation time is short, and the production efficiency is high. Can be suitable for synthetic rubber latex and natural rubber latex which contain gel, have no gel, have high Mooney viscosity, low Mooney viscosity, have polar groups and the like and have strong adhesiveness.
Description
Technical field
The present invention relates to a kind of condensing method of rubber latex, in more detail, is a kind of continuous condensing method of rubber latex.
Background technology
At present, the condensing method of relevant latex is existing multiple, as with latex being the positive coacervation that raw material adds flocculation agent; With the flocculation agent is the anti-coacervation that raw material adds latex; It with latex, glue convection drying coacervation of raw material etc.
Positive coacervation:
Directly coacervation is meant under agitation condition, segmentation adds flocculation agent in latex, or latex is directly joined in the flocculation agent method of cohesion rubber, though can obtain well behaved rubber, using this method is intermittently preparation, and production efficiency is low, the energy consumption height, cohesion back rubber form is irregular, and body is bigger, needs the compression moulding packing.
The preparation method of acrylonitrile-butadiene rubber powder among the patent CN93101142.6, it is the positive coacervation batch process for preparing of a kind of employing, be that segmentation adds monovalence and divalent metal salt brine solution in nitrile rubber, through pre-coagulate, flocculation, micelle sclerosis equal segments cohesion complex process, several steps is finished in corresponding several separate mixing tank, therefore exist production efficiency low, shortcoming such as energy consumption, material consumption are big.
Anti-coacervation:
Latex is directly joined the anti-method of coagulating for preparing rubber in the flocculation agent, instead is mutation process with fixed attention, and pool time is extremely short, original stable latex is destroyed in moment, easily forms sealing coat, generally, form the bag slurry, flocculating result is relatively poor, only is adapted to resin emulsion at present and becomes powder.
All there be the problem of cleaning cohesion with equipment in above method, and nonproductive consumption rate is bigger on raw material, production time, plant factor.
US4265939 discloses a kind of method of continuous production of rubber powder, latex is mixed with flocculation agent, to condense latex again and deliver in the extra heavy pipe and mixed with polymers as coating-forming agent, cohesion can make tube wall produce on deleterious deposition or the wall to lump in tubule.
CN1117117C discloses a kind of method that is used for making continuously the rubber powder that contains filler, wherein, and with liquid-phase mixing filler suspension and rubber latex.Liquid form mixt is carried by a pipe, mixes the rubber powder that contains filler with a kind of condensing agent and precipitation in pipe at least.Liquid form mixt is carried by the throttle position that at least one is arranged in the pipe, and the latter has variable throttling cross section; The characteristics of this method are to mix throttling more earlier, promptly are to make rubber latex and filler be mixed into suspension to mix through throttling, add behind condensing agent or the coating-forming agent more further throttling again and mix, and this method amount of filler is big, and efficient is not high, and it is bigger to produce consumption rate.
Need a kind of condensing method of exploitation at present badly, adopt the successive method, can be with the direct condensation powdering of all kinds latex, it is even to produce rubber particles, and pool time is short, and cohesion equipment does not need cleaning, the method for the continuous cohesion latex that energy consumption is low, production efficiency is high substantially.
Summary of the invention
The object of the present invention is to provide the method for the continuous cohesion rubber latex that a kind of energy consumption is low, production efficiency is high.
The condensing method of rubber latex of the present invention is rubber latex to be fed tubular static mixer condense continuously, tubular static mixer contains to be responsible for and arm, in the person in charge, add rubber latex, arm and stream add flocculation agent or and other auxiliary agent, one or more nozzles are arranged in the person in charge, arm is located at the nozzle rear, and the auxiliary agent that is added to the person in charge by arm mixes with it under rubber latex turbulent flows state; Condensation temperature is 25~45 ℃, pool time 0.5~10min.
0.4~3 millimeter of rubber grain particle diameter after condensing method cohesion of the present invention, product after the cohesion obtains difform rubber product through different subsequent handlings again, as obtaining powdered rubber product or granulated rubber product through chemistry or physical isolation processing; Also can make sheet rubber by press filtration, washing through fourdrinier wire.
Arm can be one or more, respectively as flocculation agent or and the adding pipeline of other auxiliary agent, arm is located at the nozzle rear, makes latex and flocculation agent that latex is mixed continuously and is condensed into the suspended mixture that contains solid rubber small-particle and cohesion back mother liquor.The present invention does not get rid of and uses other auxiliary agent, as thinner, separant, coating etc., and also special requirement and flow addition sequence not.In the arm also can in establish nozzle, turbulization when its material being entered be responsible for to mix is mixed more abundant.
The present invention also condensing method of a kind of rubber latex of special recommendation is rubber latex to be fed tubular static mixer condense continuously, tubular static mixer contains to be responsible for and three arms, in the person in charge, add rubber latex, add univalent metal salt solution in first arm, adding two and/or trivalent metal salts solution add entry or separant, coating solution in the 3rd arm in second arm.The dried glue weight of latex is 100 parts of weight meters, preferably 25~30 parts of the amounts of the univalent metal salt that adds in first arm, preferably 10~15 parts of the amounts of the monovalence that adds in second arm, divalence and/or trivalent metal salt add preferably 8~12 parts of the amounts of entry or separant, coating in the 3rd arm.
Built-in nozzle form the present invention is not limited especially in the pipe, be preferably conical, the person in charge can be that straight tube also can be an adapter bonnet, difference according to institute's coagel dairy products kind, select suitable caliber and shape, as being chosen in the nozzle position, expanding with arm connecting portion caliber, caliber after the expansion is 1.3~1.5 times of the preceding caliber of expansion, make it enough big space and obtain best turbulent flow mixed effect, finish chemical phase transition process in physical mixing processes, promptly Ye Tai latex changes solid-state rubber particles into.
The method of special recommendation of the present invention is to have among the rubber latex person in charge in conveying, add flocculation agent (univalent metal salt or two, trivalent metal salts solution) by arm, it is mixed in the turbulent flows state and be condensed into short grained process, latex is condensed with fine granularity.
Characteristics of the present invention are to adopt the tubular type equipment of simple built-in nozzle to realize the continuity that rubber latex condenses.
Rubber latex among the present invention can be a natural rubber latex, it also can be synthetic latex, particularly used the emulsion polymerization latex of negatively charged ion or nonionic emulsifying agent, the independent polymkeric substance-content of polybutadiene rubber latex of conjugated diolefine hydrocarbon compound that polymerization makes as conventional emulsion, chloroprene rubber latex etc.; The binary of vinyl compounds such as conjugated diolefine hydrocarbon compound and vinylbenzene, vinyl cyanide, vinylformic acid, methacrylic acid or terpolymer-styrene butadiene rubber latex, paracril latex, carboxy nitrile rubber latex, carboxylic styrene-butadiene rubber latex etc.
The used flocculation agent of the present invention is univalent metal salt, divalent metal salt, also can be trivalent metal salt, needs to select different flocculation agent for use according to different latex, can be NaCl, KCl, CaCl
2, K
2SO
4, H
2SO
4, MgSO
4, Zn
2SO
4, in the alum etc. one or more.
These flocculation agent---univalent metal salt, divalence, trivalent metal salt are 100 parts of weight in the dried glue weight of latex, and addition is preferably 1~40 part; It uses with aqueous solution form, and concentration is the general mass percent concentration of this technical field, is preferably 2%~25%.The flocculation agent consumption is relevant with the kind of latex, the flocculation agent consumption or (with) the concentration deficiency, latex is difficult for breakdown of emulsion, or forms oversize particle and block; If consumption is too big, though can form particle, can increase the flocculation agent consumption, increase product cost.The present invention does not do unqualified to the pH value of rubber latex.The present invention does not get rid of the use of other auxiliary agent that is suitable for condensing yet.
Condensation temperature is 25~45 ℃ among the present invention, because rubber latex uses tubular static mixer of the present invention to condense continuously, therefore on the operational condition with prior art in the cohesion of still formula different, pool time is shorter, therefore the condensation temperature of special recommendation of the present invention is 35~45 ℃, crosses the low or too high form that all can influence aggregated particle.
Pool time is short among the present invention, generally is preferably in 0.5~10min, but the too short form that also can influence aggregated particle of pool time.
The rubber particles that uses the method for emulsion condensation of the present invention to make is even, and foreign matter content is few, and pool time is short, the production efficiency height.Can be adapted to contain gel, gel-free, high Mooney viscosity, low mooney viscosity and have strong synthetic rubber latex and the natural rubber latexes of cementability such as polar group.
Description of drawings
Fig. 1 is an example of the method for application emulsion condensation of the present invention.
Among the figure:
A-represents the monovalent salt mixing solutions
B-represents the divalent salts mixing solutions
C-represents two, the trivalent mixed salt solution
L-represents the direction of latex and adding
M-represents to be condensed into the suspended mixture of solid rubber small-particle and cohesion back mother liquor
1,2,3,4,5,6-represents built-in nozzle
Fig. 2 is built-in nozzle section synoptic diagram in being responsible for.
Fig. 3, Fig. 4, Fig. 5 are responsible for for the method for using emulsion condensation of the present invention and are the example of adapter bonnet.
Embodiment
Below illustrate that with embodiment but the present invention is not limited to these embodiment.Unless outside specializing among the embodiment, " part ", " % " all refer to mass percent.Mixed liquor A is a univalent metal salt solution, and mixed liquid B is the divalent metal salts solution, and mixed solution C is two, the trivalent metal salts solution, and concentration is respectively 15%, 12%, 18%.A, B, C are added to the person in charge by different arms respectively.
Rubber latex among the embodiment is as described below:
1. paracril latex (to call NBR in the following text)
The nitrile rubber that CNPC's Lanzhou Petrochemical is produced.
2. styrene-butadiene latex (to call SBR in the following text)
Styrene butadiene rubber latex SBR-1500, XSBR, SBR-1712 that CNPC's Lanzhou Petrochemical is produced.
3. content of polybutadiene rubber latex (to call BR in the following text)
The polybutadiene latex that CNPC Lanzhou Petrochemical synthetic rubber plant produces.
4. carboxylic acrylonitrile butadiene rubber latex, the commercially available prod.
What the emulsion condensation device used is device shown in Figure 1.
Embodiment 1
What the emulsion condensation device used is device shown in Figure 1, and wherein the diameter of Zhu Guaning is DN125, and the diameter of arm is DN100.Condensation temperature is 35 ℃, pool time 2min.(pool time is meant from latex and flocculation agent and begins to add the timed interval of cohesion pipe to condensation product inflow receiving pit that following examples together.)
First step: saturated nacl aqueous solution mixes with soft water, forms mixed liquor A;
Second step: by storage tank with pump through filter, NBR latex is delivered to the emulsion condensation device---cohesion is responsible for, and the mixed liquor A of delivering to first arm in first nozzle (its add-on be latex solid content 25%) is mixed the formation throw out;
Third step: the mixed liquid B that the second step gained throw out is delivered to second arm in second nozzle (its add-on be latex solid content 8%) is mixed, and forms condensation product; Mixed liquid B is MgSO
4The aqueous solution.
The 4th step: the mixed solution C that is delivered to the 3rd arm in the 3rd nozzle by third step gained condensation product mixes (its add-on be latex solid content 3%), in condensation product added receiving pit before the filter screen along pipeline, fourdrinier wire forms adhesive tape on the equal then uniform flow, the elimination whey liquid, through washing, press filtration, vacuum and drying, be packaged into product.Mixed solution C is CaCl
2The aqueous solution.
The condensation product particle grain size distribution is :≤2.5mm accounts for 85%, and≤2.0mm accounts for 75%.
What the emulsion condensation device used is device shown in Figure 1, and wherein the diameter of Zhu Guaning is DN125, and the diameter of arm is DN100.Condensation temperature is 40 ℃, pool time 4min.
First step: saturated nacl aqueous solution mixes with soft water, forms mixed liquor A;
Second step: by storage tank with pump through filter, deliver to the NBR latex of cohesion pipe, in first nozzle, mixes the formation throw out with mixed liquor A (its add-on be latex solid content 18%);
Third step: with the second step gained throw out in second nozzle with mixed liquid B (MgSO
4The aqueous solution, add-on be the latex solid content 12%) mix, form condensation product;
The 4th step: in the 3rd nozzle, mix with water by third step gained condensation product, condensation product is added the slurry receiver successively along pipeline, in groove, add separant potassium stearate soap lye (add-on be in the groove rubber solid content 10%, soap lye concentration is 15%), through surperficial slaking and effective isolation processing, after sending into the dehydration of precession horizontal centrifuge, dry and screening operation obtains qualified powdered rubber product by vacuum pneumatic, and the condensation product particle grain size distribution is :≤1.25mm account for 95% ,≤1.0mm account for 75% ,≤0.5mm account for 55%.
Embodiment 3
What the emulsion condensation device used is device shown in Figure 1, and wherein the diameter of Zhu Guaning is DN125, and the diameter of arm is DN100.Condensation temperature is 35 ℃, pool time 5min.
First step: saturated nacl aqueous solution mixes with soft water, forms mixed liquor A;
Second step: by storage tank with pump through filter, deliver to the NBR latex of cohesion pipe, in first nozzle, mixes the formation throw out with mixed liquor A (its add-on be latex solid content 25%);
Third step: the second step gained throw out is mixed with mixed liquid B (its add-on be latex solid content 8~9%) in second nozzle, form condensation product; B is ZnSO
4The aqueous solution.
The 4th step: mix with water in the 3rd nozzle by third step gained condensation product, condensation product is added receiving pit before the filter screen along pipeline in, then all on the uniform flow fourdrinier wire form adhesive tape, the elimination whey liquid through washing, press filtration, vacuum and drying, is packaged into product.The condensation product particle grain size distribution is :≤1.0mm account for 95% ,≤0.5mm account for 45%.
What the emulsion condensation device used is device shown in Figure 1, and wherein the diameter of Zhu Guaning is DN125, and the diameter of arm is DN100.Condensation temperature is 30 ℃, pool time 6min.
First step: saturated nacl aqueous solution mixes with soft water, forms mixed liquor A;
Second step: by storage tank with pump through filter, deliver to the SBR latex of cohesion pipe, in first nozzle, mixes the formation throw out with mixed liquor A (its add-on be latex solid content 30%);
Third step: the second step gained throw out is mixed with mixed liquid B (its add-on be latex solid content 5%) in second nozzle, form condensation product; B is the sodium chloride-containing aqueous solution.
The 4th step: mix with water in the 3rd nozzle by third step gained condensation product, condensation product is added receiving pit before the filter screen along pipeline in, all the uniform flow upper filter screen forms blob of viscose then, the elimination whey liquid through washing, vacuum, drying and briquetting, is packaged into product.The condensation product particle grain size distribution is :≤1.25mm account for 99% ,≤1.0mm account for 89% ,≤0.5mm account for 75%.
What the emulsion condensation device used is device shown in Figure 1, and wherein the diameter of Zhu Guaning is DN125, and the diameter of arm is DN100, and condensation temperature is 30~35 ℃, pool time 2min.
First step: saturated nacl aqueous solution mixes with soft water, forms mixed liquor A;
Second step: by storage tank with pump through filter, deliver to the content of polybutadiene rubber latex of cohesion pipe, in first nozzle, mixes the formation throw out with mixed solution (its add-on be latex solid content 12%) A;
Third step: the second step gained throw out is mixed with mixed liquid B (its add-on be latex solid content 5%) in second nozzle, form condensation product; B is MgSO
4The aqueous solution.
The 4th step: in the 3rd nozzle, mix with mixed solution C (its add-on be latex solid content 5%) by third step gained condensation product, in condensation product added receiving pit before the filter screen along pipeline, fourdrinier wire forms adhesive tape on the equal then uniform flow, the elimination whey liquid, through washing, press filtration, vacuum and drying, be packaged into product.Mixed solution C is an alum solution.
The condensation product particle grain size distribution is :≤1.25mm account for 98% ,≤1.0mm account for 95% ,≤0.5mm account for 65%.
What the emulsion condensation device used is device shown in Figure 1, and wherein the diameter of Zhu Guaning is DN125, and the diameter of arm is DN100.Condensation temperature is 40 ℃, pool time 2min.
First step: saturated nacl aqueous solution mixes with soft water, forms mixed liquor A;
Second step: by storage tank with pump through filter, deliver to the carboxy nitrile rubber latex of cohesion pipe, in first nozzle, mixes the formation throw out with mixed liquor A (its add-on be latex solid content 18%);
Third step: with the second step gained throw out in second nozzle and K
2SO
4Aqueous solution forms condensation product, K
2SO
4Add-on is 17% of a latex solid content;
The 4th step: condensation product is added the slurry receiver successively along pipeline, in groove, add the separant Magnesium Stearate, through surperficial slaking and isolation processing, send into the dehydration of precession horizontal centrifuge after, dry and screening operation obtains qualified powdered rubber product by vacuum pneumatic.The condensation product particle grain size distribution is :≤1.25mm account for 97% ,≤1.0mm account for 95% ,≤0.5mm account for 75%.
The product salient features:
Product mainly is powder and sheet, niggerhead, its leading indicator be rubber become content in 97% above moisture content below 1.0%, saltiness is below 1.5%.
Comparative Examples 1:
According to the identical condition of embodiment, only be to change cohesion equipment, the arm entry position is re-established as the place ahead of being responsible for nozzle, its flocculating result is not good at the rear of being responsible for nozzle, cause the turbulent flow mixed effect poor, cohesion back particle is inhomogeneous, and it is big and irregular that particle diameter becomes, even can cause line clogging.
According to the condition of embodiment 1, the arm entry position is re-established as the place ahead of being responsible for nozzle, condensation temperature is 35 ℃, its flocculating result is not good at the rear of being responsible for nozzle, the condensation product particle grain size distribution is :≤3.0mm accounts for 95%, and≤2.0mm accounts for 25%, and≤1.0mm accounts for 5%, it is big that flocculated particle obviously becomes, and forming bulk easily, blocking pipeline also forms the coherent packet slurry easily, cause cohesion not exclusively, be difficult for dry.
Claims (10)
1. the method for an emulsion condensation, it is characterized in that rubber latex is fed tubular static mixer to be condensed continuously, tubular static mixer contains to be responsible for and arm, in the person in charge, add rubber latex, arm and stream add flocculation agent or and other auxiliary agent, one or more nozzles are arranged in the person in charge, and arm is located at the nozzle rear, and the auxiliary agent that is added to the person in charge by arm mixes with it under rubber latex turbulent flows state; Condensation temperature is 25~45 ℃, pool time 0.5~10min.
2. method according to claim 1, it is characterized in that being responsible for is adapter bonnet, expands at the nozzle position and/or with arm connecting portion caliber.
3. method according to claim 1 is characterized in that arm is one or more, respectively as flocculation agent or/and the adding pipeline of other auxiliary agent.
4. method according to claim 1 is characterized in that establishing in the arm nozzle.
5. method according to claim 3, it is characterized in that rubber latex is fed tubular static mixer to be condensed continuously, tubular static mixer contains to be responsible for and three arms, in the person in charge, add rubber latex, add univalent metal salt solution in first arm, in second arm, add monovalence, two and/or the trivalent metal salts solution, in the 3rd arm, add entry, separant and/or coating solution.
6. method according to claim 5, it is characterized in that the dried glue weight of latex is 100 parts of weight meters, the amount of the univalent metal salt that adds in first arm is 25~30 parts, the amount of the monovalence that adds in second arm, divalence and/or trivalent metal salt is 10~15 parts, and the amount that adds entry or separant, coating in the 3rd arm is 8~12 parts.
7. method according to claim 1 is characterized in that rubber latex is a natural rubber latex, or the synthetic latex of letex polymerization.
8. method according to claim 7 is characterized in that synthetic latex is content of polybutadiene rubber latex, chloroprene rubber latex, styrene butadiene rubber latex, paracril latex, carboxy nitrile rubber latex or carboxylic styrene-butadiene rubber latex.
9. method according to claim 1 is characterized in that flocculation agent is NaCl, KCl, CaCl
2, K
2SO
4, H
2SO
4, MgSO
4, Zn
2SO
4, in the alum one or more.
10. method according to claim 1 is characterized in that flocculation agent is 100 parts of weight in the dried glue weight of latex, and addition is 1~40 part.
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CN103804735A (en) * | 2012-11-14 | 2014-05-21 | 中国石油天然气股份有限公司 | Preparation method of modified oil-extended powder styrene-butadiene rubber |
CN103864963A (en) * | 2014-03-25 | 2014-06-18 | 北京化工大学 | Preparation method for low-heat productivity natural rubber |
CN104292369A (en) * | 2014-11-03 | 2015-01-21 | 上海三爱富新材料股份有限公司 | Continuous condensation method of perfluorinated ethylene propylene emulsion |
CN104558257A (en) * | 2013-10-17 | 2015-04-29 | 海南大学 | Quick granulation device for natural latex |
CN104710547A (en) * | 2013-12-17 | 2015-06-17 | 北方华锦化学工业集团有限公司 | Agglomeration method of polybutadiene latex used for acrylonitrile butadiene styrene (ABS) resin |
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CN103804735A (en) * | 2012-11-14 | 2014-05-21 | 中国石油天然气股份有限公司 | Preparation method of modified oil-extended powder styrene-butadiene rubber |
CN103804735B (en) * | 2012-11-14 | 2016-06-08 | 中国石油天然气股份有限公司 | Preparation method of modified oil-extended powder styrene-butadiene rubber |
CN104558257A (en) * | 2013-10-17 | 2015-04-29 | 海南大学 | Quick granulation device for natural latex |
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CN104710547A (en) * | 2013-12-17 | 2015-06-17 | 北方华锦化学工业集团有限公司 | Agglomeration method of polybutadiene latex used for acrylonitrile butadiene styrene (ABS) resin |
CN103864963A (en) * | 2014-03-25 | 2014-06-18 | 北京化工大学 | Preparation method for low-heat productivity natural rubber |
CN103864963B (en) * | 2014-03-25 | 2015-12-09 | 北京化工大学 | A kind of preparation method of low-heat-generation natural rubber |
CN104292369A (en) * | 2014-11-03 | 2015-01-21 | 上海三爱富新材料股份有限公司 | Continuous condensation method of perfluorinated ethylene propylene emulsion |
CN110272511A (en) * | 2018-03-13 | 2019-09-24 | 中国石油天然气股份有限公司 | Process for recovering polymer from polymer emulsion |
CN110272511B (en) * | 2018-03-13 | 2022-03-29 | 中国石油天然气股份有限公司 | Process for recovering polymer from polymer emulsion |
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