CN109485752A - A kind of concentrated natural latex flucculation process - Google Patents
A kind of concentrated natural latex flucculation process Download PDFInfo
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- CN109485752A CN109485752A CN201811264682.1A CN201811264682A CN109485752A CN 109485752 A CN109485752 A CN 109485752A CN 201811264682 A CN201811264682 A CN 201811264682A CN 109485752 A CN109485752 A CN 109485752A
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- flocculation agent
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- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000008569 process Effects 0.000 title claims abstract description 23
- 238000005189 flocculation Methods 0.000 claims abstract description 42
- 230000016615 flocculation Effects 0.000 claims abstract description 41
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 34
- 229920003052 natural elastomer Polymers 0.000 claims abstract description 34
- 229920001194 natural rubber Polymers 0.000 claims abstract description 34
- 239000013535 sea water Substances 0.000 claims abstract description 26
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 239000008367 deionised water Substances 0.000 claims abstract description 4
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 24
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 10
- 239000000693 micelle Substances 0.000 claims description 8
- 229920000126 latex Polymers 0.000 claims description 7
- 239000004816 latex Substances 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 6
- 229920002472 Starch Polymers 0.000 claims description 5
- DHRRIBDTHFBPNG-UHFFFAOYSA-L magnesium dichloride hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-] DHRRIBDTHFBPNG-UHFFFAOYSA-L 0.000 claims description 5
- 239000011780 sodium chloride Substances 0.000 claims description 5
- 235000019698 starch Nutrition 0.000 claims description 5
- 239000008107 starch Substances 0.000 claims description 5
- 239000003643 water by type Substances 0.000 claims description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical class [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 4
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 4
- 230000006641 stabilisation Effects 0.000 claims description 4
- 238000011105 stabilization Methods 0.000 claims description 4
- 230000036571 hydration Effects 0.000 claims description 3
- 238000006703 hydration reaction Methods 0.000 claims description 3
- 102000004169 proteins and genes Human genes 0.000 claims description 3
- 108090000623 proteins and genes Proteins 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 229910021655 trace metal ion Inorganic materials 0.000 claims description 2
- 229940050906 magnesium chloride hexahydrate Drugs 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- 239000003292 glue Substances 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000001681 protective effect Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000010090 natural rubber production Methods 0.000 abstract description 2
- 238000013019 agitation Methods 0.000 abstract 1
- 239000002253 acid Substances 0.000 description 11
- 229920001971 elastomer Polymers 0.000 description 7
- 239000006101 laboratory sample Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 238000004073 vulcanization Methods 0.000 description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 238000004220 aggregation Methods 0.000 description 4
- 230000002776 aggregation Effects 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 150000001768 cations Chemical class 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003311 flocculating effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- 239000004594 Masterbatch (MB) Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 239000006071 cream Substances 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 229920001195 polyisoprene Polymers 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- RPAJSBKBKSSMLJ-DFWYDOINSA-N (2s)-2-aminopentanedioic acid;hydrochloride Chemical compound Cl.OC(=O)[C@@H](N)CCC(O)=O RPAJSBKBKSSMLJ-DFWYDOINSA-N 0.000 description 1
- RSWGJHLUYNHPMX-UHFFFAOYSA-N 1,4a-dimethyl-7-propan-2-yl-2,3,4,4b,5,6,10,10a-octahydrophenanthrene-1-carboxylic acid Chemical compound C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 206010054949 Metaplasia Diseases 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 235000014633 carbohydrates Nutrition 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- -1 matter Substances 0.000 description 1
- 230000015689 metaplastic ossification Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 1
- IUJLOAKJZQBENM-UHFFFAOYSA-N n-(1,3-benzothiazol-2-ylsulfanyl)-2-methylpropan-2-amine Chemical compound C1=CC=C2SC(SNC(C)(C)C)=NC2=C1 IUJLOAKJZQBENM-UHFFFAOYSA-N 0.000 description 1
- 229920005615 natural polymer Polymers 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
- 239000003960 organic solvent Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C1/00—Treatment of rubber latex
- C08C1/14—Coagulation
- C08C1/15—Coagulation characterised by the coagulants used
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
The invention belongs to natural rubber production technical fields, it is related to a kind of concentrated natural latex flucculation process, first, concentrated natural latex is slowly added into class seawater flocculation agent under agitation, after concentrated natural latex is added, continues to stir 20-40min, concentrated natural latex is placed under setting condition with class seawater flocculation agent and is reacted, then, 15-35 DEG C is naturally cooled to, gelled block is obtained；Then, gel piece is cleaned using 300ml deionized water；Finally, gel piece is sequentially placed into open mill and dryer and is dehydrated and is dried respectively, be made natural rubber, have it is following a little: first is that class seawater flocculation agent is cheap, it is environmentally protective, second is that equipment requirement is low, it is conventional equipment, reaction condition is mild, it is corrosion-free to equipment, it is distributed third is that technical process has no irritating odor, it is small on operator's influence, it is environmentally friendly；Fourth is that overcoming weather, quality of concentrated natural latex and stopping influence of the factors such as glue phase to natural rubber consecutive production.
Description
Technical field:
The invention belongs to natural rubber production technical fields, are related to a kind of concentrated natural latex flucculation process, using class sea
Water flocculation agent carries out rapid flocculation, the superior natural rubber of processability to concentrated natural latex.
Background technique:
In recent years, the yield of global concentrated natural latex is manufactured up to 1,000,000 tons/year or more using concentrated natural latex
Rubber product, except having production process simple, without heavy equipment and organic solvent, power consumption is few, working condition is good, product
Outside the advantages that certain performances are high, also it is easier to realize mechanization and automation.All products using latex manufacture are all with concentration day
Right latex is not doing raw material with caouttchouc.Natural rubber (NR) is one kind using cis- Isosorbide-5-Nitrae-polyisoprene as main component
Natural polymer, 91%~94% is rubber hydrocarbon (cis- Isosorbide-5-Nitrae-polyisoprene) in ingredient, remaining is albumen
The nonrubber materials such as matter, fatty acid, ash content, carbohydrate.Natural rubber is most widely used general purpose rubber.Natural rubber has excellent
The characteristics such as resilience, insulating properties, water-resisting property and plasticity, also, also have after proper treatment oil resistant, it is acidproof, alkaline-resisting,
The preciousness property such as heat-resisting, cold-resistant, pressure-resistant, wear-resisting, so, there is extensive use.Such as rain boots used in daily life, warm water
Bag, elastic band；Surgeon's gloves used in medical and health industry, blood transfusion tube, sheath；The various wheels used in communications and transportation
Tire；Conveyer belt, conveyer belt, the acidproof and alkali-resistant gloves industrially used；The irrigation hose that agriculturally uses, ammoniacal liquor bag；It is meteorological
Measuring sounding balloon；The sealing of scientific experimentation, shock-absorption；Aircraft, tank, the artillery, gas defence face used in national defence
Tool；The even high-grade, precision and advanced scientific and technical product such as rocket, artificial earth satellite and spaceship all be unable to do without natural rubber.With
Natural rubber is widely used in the fields such as communications and transportation, military project and space flight, natural rubber and coal, steel, petroleum and referred to as four
The big raw material of industry.Natural rubber is that Heveatex is prepared by collection, solidification, cleaning and drying and other steps, wherein solidifying
Technique is to form the important step of natural rubber.Currently, natural latex coargulation mode mainly includes natural flocculation, microorganism wadding
Solidifying, acid flocculation, inorganic salts flocculation and bioflocculation, flocculation are to instigate in water or liquid suspended particulates to gather to become larger or formed wadding
Group, to accelerate the coagulation of particle, achievees the purpose that solid- liquid separation, this phenomenon or operation are referred to as flocculation.Usual flocculated reality
It applies by adding flocculant appropriate, effect is adsorbent particles, between particle " bridge formation ", to promote to gather.Heveatex industry
In, flocculation is the first stage of latex coagulation, is a kind of irreversible aggregation.Flocculant is usually ammonium salt one kind electrolyte or has
The colloid chemicals of suction-operated.Flocculating effect depend on particle characteristic and fluid mixing condition, to contain short grained water
Middle dosing coagulant can cause that particle is de- steady, starts to flocculate.The flocculation rate of molecule is related with intergranular diffusion rate,
Dominant mechanism for little particle (partial size is less than 0.1 μm) aggregation is Brownian movement or microcosmic flocculation.Microcosmic flocculation is also referred to as
Incorgruous flocculation when little particle is assembled, forms bigger particle.After very short time (several seconds), it is formed 1~100 μm
Micro-floccule；Particle flocculation main mechanism for partial size greater than 1 μm is the mixing at a slow speed of water, frequently with mechanical agitator.It stirs
The velocity gradient for mixing generation causes the collision between suspended particulate to be referred to as macroscopic view flocculation or flocculation in the same direction.However, flocculating in macroscopic view
Mixed process in, floc particle will receive the effect of shearing force, so as to cause the disintegrating of some wadding body aggregations, damaged or wadding
Body is crushed.After mixing a period of time, the wadding body of stable dimensions distribution is formed.It the formation of floc particle and broken almost puts down
Weighing apparatus can guarantee that suspended particulate forms the wadding of Stable distritation by the use of the hydraulics and chemical floc of control solution
Body.Particle will cause the aggregation of wadding body with different rate sedimentations and increase, in precipitation process, heterogeneous suspension (no
Same partial size) in the different sedimented particles that are formed be that flocculation is promoted to provide additional mechanism, for hanging comprising particle size range is big
For supernatant liquid, relative settlement is an important flocculation mechanism.Flocculation caused by relative settlement is to direct filtering, air-dissolving air-float and height
Fast precipitation process will not have an impact.Wherein acid flocculates the acid such as usual formic acid, acetic acid or sulfuric acid as flocculant, acids
The mechanism of flocculant solidification Heveatex is to reduce the pH value of Heveatex by increasing hydrionic amount in Heveatex, is pressed
The electric double layer of contracting Heveatex particle surface, keeps hydration shell thinning, when reaching the isoelectric point of protein, electro kinetic potential zero,
It is solidified blocking without mutually assembling after repulsion again between natural rubber particle.Different solidification modes directly affects the product of natural rubber
Matter, when adding acids flocculant into Heveatex, freezing point will form fine and close grumeleuse, hinder flocculant uniform in latex
Distribution, is hardly formed the grumeleuse of uniform framework, so that influencing Heveatex particle forms macromolecular chain.Traditional strong acid flocculation is deposited
In the defect being difficult to avoid that, the health of operator not only will affect, corrode container and equipment, the drying stage after flocculation
Time is long, and being easy to produce sour gas influences environment, acid if strong acid, which does not wash clean clearly also, will affect subsequent vulcanization time
Vulcanization will lead to curing time lag under environment, limit the industrialization degree of natural rubber.Therefore, seek to design a kind of natural rubber
Glue flocculation process can make the production process of natural rubber environmentally protective and be easy to industrialize, and stable product quality becomes when business
It is anxious.
Summary of the invention:
It is an object of the invention to overcome in the prior art wet process mixing process there are the shortcomings that, a kind of concentration of R & D design
Heveatex flucculation process avoids passing through addition acid ingredient flocculation rubber compound and the problem of properties of rubber variation occurs.
To achieve the goals above, the technical process of concentrated natural latex flucculation process of the present invention are as follows: firstly, will
The concentrated natural latex that 50phr solid content mass fraction is 60% is slowly added into class seawater flocculation agent, in concentrated natural glue
The agent of class seawater flocculation is stirred while cream is added with the speed of 10-300r/min to continue to stir after concentrated natural latex is added
20-40min is mixed, concentrated natural latex is placed under the conditions of 40-60 DEG C of temperature with class seawater flocculation agent and is reacted 1-3 hours, with
Afterwards, 15-35 DEG C is naturally cooled to, gelled block is obtained；Then, gel piece is cleaned using 300ml deionized water；Finally, by gel
Block is sequentially placed into open mill and dryer and is dehydrated and is dried respectively, and natural rubber is made.
It is 1:1-3 that concentrated natural latex of the present invention and the ratio of class seawater flocculation agent, which are volume ratio,.
Class seawater flocculation agent of the present invention is the polymer of inorganic salts and trace metal ion, including following parts by weight
Component: 10-20 parts of sodium chloride, 30-50 parts of deionized waters, 5-10 parts of magnesium chloride hexahydrates, 20-35 parts of water soluble starch, 2-5 parts of hydrogen
Sodium oxide molybdena and 30-50 parts of seawater；Preferred weight part component is 15 parts of sodium chloride, 30 parts of deionized waters, 6 parts of magnesium chloride hexahydrates, 25
Part water soluble starch, 3 parts of sodium hydroxides and 45 parts of seawater；Its Component Source is extensive, at low cost, can neutralize colloidal particles and hang
The charge on floating object surface, preferably adapts to the sedimentation of charged colloidal particles particle, and it is micro- to significantly improve colloid in the case where low dosage
The sinking speed of grain, reduces the turbidity of supernatant, plays better flocculating effect, meanwhile, it is capable to alleviate caused by calcium salt is applied alone
The problem that gelation rate causes dewatering speed fast fastly makes concentrated natural latex form uniform gel piece, and then high-performance is made
Natural rubber.
The stabilization of natural rubber prepared by the present invention forms double electricity by the counter ion of negatively charged latex particle and surrounding
The structure that the hydrophilic protein matter of lotus and micelle adsorption and hydrone constitute hydration layer is realized.
The principle of concentrated natural latex flucculation process of the present invention is: the multivalence gold being added in concentrated natural latex
Belong to cationic and neutralize charge on robber particle, destroy micelle sealer, concentrated natural latex is made to go surely to occur to flocculate to form gel piece；
According to tertiary Cai-Ha Di rule of valence, the valence mumber of metal cation is higher, and coagulation ability is bigger, the gelling effect of univalent metal salt
Low, when contacting with each other with micelle, metal cation cannot destroy the protective layer on micelle surface, and concentrated natural latex can not wad a quilt with cotton
It is solidifying；The gelling ability of trivalent metal salt is strong, and when contacting with each other with micelle, micelle is gone rapidly surely, and the protective layer on micelle surface is whole
It loses, strand is destroyed, and concentrated natural latex forms dense gel block, reduces the molecular weight of natural rubber；Divalent gold
The metal cation for belonging to salt can make the flocculation of concentrated natural latex particle for the uniformly firm gel piece with reticular structure, shape
At complete strand, obtained gelled block is easily formed structural integrity, quality stabilization and molecule after dehydration, contraction and drying
Measure high natural rubber.
Compared with prior art, the present invention being flocculated to obtain gel to concentrated natural latex by class seawater flocculation agent
Block, gel piece form the natural rubber that structural integrity, quality are stable and molecular weight is high through dehydration, contraction and drying, have following
A little: first is that class seawater flocculation agent is cheap, it is readily available, it is environmentally protective, the cost of manufacture of natural rubber is greatly reduced,
Second is that equipment requirement is low, and it is conventional equipment, reaction condition is mild, and it is corrosion-free to equipment, third is that the nonirritant gas of technical process
Taste distributes, small on operator's influence, environmentally friendly；Fourth is that overcome weather, quality of concentrated natural latex and stop the glue phase etc.
Influence of the factor to natural rubber consecutive production；Its technical process is simple, easy to operate, improves the wadding of concentrated natural latex
Solidifying speed, obtained natural rubber quality stabilization, superior performance, the continuity industry metaplasia suitable for tread rubber and engineering face glue
It produces, there is preferable promotional value.
Specific embodiment:
Below by embodiment, the invention will be further described.
Embodiment 1:
The technical process for the concentrated natural latex flucculation process that the present embodiment is related to are as follows: firstly, 1 parts by volume 50phr is consolidated
The concentrated natural latex that content mass fraction is 60% is slowly added into 3 parts by volume class seawater flocculation agent, in concentrated natural glue
The agent of class seawater flocculation is stirred while cream is added with the speed of 10-300r/min to continue to stir after concentrated natural latex is added
20-40min is mixed, concentrated natural latex is placed under the conditions of 40-60 DEG C of temperature with class seawater flocculation agent and is reacted 1-3 hours, with
Afterwards, 15-35 DEG C is naturally cooled to, gelled block is obtained；Then, gel piece is cleaned using 300ml deionized water；Finally, by gel
Block is sequentially placed into open mill and dryer and is dehydrated and is dried respectively, and natural rubber is made.
The class seawater flocculation agent that the present embodiment is related to includes following parts by weight of component: 15 parts of sodium chloride, 30 parts of deionized waters,
6 parts of magnesium chloride hexahydrates, 25 parts of water soluble starch, 3 parts of sodium hydroxides and 45 parts of seawater.
Embodiment 2:
The present embodiment is related to vulcanized rubber and obtains all-round property testing, is wadded a quilt with cotton respectively with conventional acid flocculence and embodiment 1 first
Solidifying method prepares natural rubber, and then with the natural rubber of 100phr (with dry glue 100g calculating), the zinc oxide of 5phr, 2phr's is hard
The N330 carbon black of resin acid, the NS/TBBS of 0.7phr and 30phr is that formula prepares rubber master batch, and finally rubber master batch is put into open mill and is adjusted
Zinc oxide, stearic acid, NS and N330 carbon black are sequentially added according to the quality of setting after section gap packet roller, beats triangle bag 6 times, tabletting
At setting thickness, after parking 8h, laboratory sample is obtained, 30g laboratory sample is taken to be vulcanized with vulcanizing press respectively, takes vulcanization
Examination laboratory sample afterwards carries out measuring mechanical property, the result is as follows:
| Serial number | Test item | Conventional acid flocculence | 1 flocculence of embodiment |
| 1 | T90(min) | 15:13 | 7:27 |
| 2 | Hardness (shore A) | 56 | 54 |
| 3 | 10% stretches (Mpa) surely | 0.51 | 0.42 |
| 4 | 50% stretches (Mpa) surely | 1.00 | 0.86 |
| 5 | 100% stretches (Mpa) surely | 1.40 | 1.47 |
| 6 | 200% stretches (Mpa) surely | 2.58 | 3.41 |
| 7 | 300% stretches (Mpa) surely | 4.60 | 4.83 |
| 8 | 300% stretches/100% surely stretches surely | 2.44 | 4.59 |
| 9 | Tensile strength (Mpa) | 27.96 | 23.61 |
| 10 | Elongation at break (%) | 673.95 | 577.9 |
| 11 | Tearing strength (KN/m) | 69.81 | 60.7 |
Learn: the vulcanization time T90 for the natural rubber laboratory sample that 1 flocculence of embodiment is prepared is than conventional flocculence
The vulcanization time T90 for the natural rubber laboratory sample being prepared is short, and under high deformation condition, 1 flocculence of embodiment is prepared into
The intensity of the natural rubber laboratory sample arrived is higher, and the 300% of the natural rubber laboratory sample that 1 flocculence of embodiment is prepared
Stress at definite elongation is higher, embodies higher filler network structure, and filler-filler interaction is strong.
Claims (5)
1. a kind of concentrated natural latex flucculation process, it is characterised in that firstly, by 50phr solid content mass fraction be 60% it is dense
Contracting Heveatex is slowly added into class seawater flocculation agent, with the speed of 10-300r/min while concentrated natural latex is added
Degree stirring class seawater flocculation agent after concentrated natural latex is added, continues to stir 20-40min, by concentrated natural latex and class
Seawater flocculation agent is reacted 1-3 hours under the conditions of being placed in 40-60 DEG C of temperature, then, is naturally cooled to 15-35 DEG C, is gelled
Block；Then, gel piece is cleaned using 300ml deionized water；Finally, gel piece is sequentially placed into open mill and dryer respectively
It is dehydrated and is dried, natural rubber is made.
2. concentrated natural latex flucculation process according to claim 1, it is characterised in that concentrated natural latex and class seawater
The ratio of flocculant is that volume ratio is 1:1-3.
3. concentrated natural latex flucculation process according to claim 1, it is characterised in that class seawater flocculation agent is inorganic salts
With the polymer of trace metal ion, including following parts by weight of component: 10-20 parts of sodium chloride, 30-50 parts of deionized waters, 5-10
Part magnesium chloride hexahydrate, 20-35 parts of water soluble starch, 2-5 parts of sodium hydroxides and 30-50 parts of seawater.
4. concentrated natural latex flucculation process according to claim 1, it is characterised in that class seawater flocculation agent preferred weight
Part component is 15 parts of sodium chloride, 30 parts of deionized waters, 6 parts of magnesium chloride hexahydrates, 25 parts of water soluble starch, 3 parts of sodium hydroxides and 45
Part seawater.
5. concentrated natural latex flucculation process according to claim 1, it is characterised in that the stabilization of the natural rubber of preparation
By the counter ion of negatively charged latex particle and surrounding formed the hydrophilic protein matter of double charge and micelle adsorption with
The structure that hydrone constitutes hydration layer is realized.
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| WO2020087952A1 (en) * | 2018-10-29 | 2020-05-07 | 青岛科技大学 | Method for flocculating fresh latex |
| CN111777774A (en) * | 2020-07-16 | 2020-10-16 | 株洲安宝麟锋新材料有限公司 | Acid-free preparation method of wet mixing rubber material |
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