CN113385035A - Automatic colloidal-clear concentration system and concentration method thereof - Google Patents
Automatic colloidal-clear concentration system and concentration method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000004816 latex Substances 0.000 claims abstract description 70
- 229920000126 latex Polymers 0.000 claims abstract description 70
- 239000012528 membrane Substances 0.000 claims description 49
- 238000000108 ultra-filtration Methods 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 18
- 239000002994 raw material Substances 0.000 claims description 16
- 238000005406 washing Methods 0.000 claims description 15
- 239000003292 glue Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 210000002966 serum Anatomy 0.000 claims description 8
- 239000012466 permeate Substances 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 5
- 230000002000 scavenging effect Effects 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 239000010425 asbestos Substances 0.000 claims description 2
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- 229910052618 mica group Inorganic materials 0.000 claims description 2
- 238000010926 purge Methods 0.000 claims description 2
- 239000010453 quartz Substances 0.000 claims description 2
- 229910052895 riebeckite Inorganic materials 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 abstract description 39
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 18
- 238000007711 solidification Methods 0.000 abstract description 7
- 230000008023 solidification Effects 0.000 abstract description 7
- 150000007524 organic acids Chemical class 0.000 abstract description 6
- 238000001035 drying Methods 0.000 abstract description 4
- 230000018044 dehydration Effects 0.000 abstract description 3
- 238000006297 dehydration reaction Methods 0.000 abstract description 3
- 238000005345 coagulation Methods 0.000 abstract description 2
- 230000015271 coagulation Effects 0.000 abstract description 2
- 239000012141 concentrate Substances 0.000 abstract description 2
- 238000004140 cleaning Methods 0.000 description 28
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 20
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 12
- 230000008569 process Effects 0.000 description 11
- 238000011084 recovery Methods 0.000 description 11
- 229910021529 ammonia Inorganic materials 0.000 description 10
- 230000032683 aging Effects 0.000 description 9
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 8
- 239000004636 vulcanized rubber Substances 0.000 description 8
- 239000011148 porous material Substances 0.000 description 6
- 239000002351 wastewater Substances 0.000 description 5
- 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 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 235000019253 formic acid Nutrition 0.000 description 4
- 239000003963 antioxidant agent Substances 0.000 description 3
- 230000003078 antioxidant effect Effects 0.000 description 3
- 102000004169 proteins and genes Human genes 0.000 description 3
- 108090000623 proteins and genes Proteins 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 244000043261 Hevea brasiliensis Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
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- 239000012535 impurity Substances 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920003052 natural elastomer Polymers 0.000 description 2
- 229920001194 natural rubber Polymers 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
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- 238000004073 vulcanization Methods 0.000 description 2
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- 238000002474 experimental method Methods 0.000 description 1
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- 239000007789 gas Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/145—Ultrafiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/18—Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/20—Accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/06—Tubular membrane modules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2315/00—Details relating to the membrane module operation
- B01D2315/10—Cross-flow filtration
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides an automatic gelatin-clear concentration system and a concentration method thereof. The system is adopted to automatically concentrate the skim latex to the target concentration, and then organic acid is used for solidification, so that sulfuric acid is not used. The method is adopted to obtain the concentrated skim latex with high rubber content and low non-rubber component content. Then organic acid is used for coagulation, and the skim rubber with higher quality is prepared by further dehydration and drying.
Description
Technical Field
The invention relates to the technical field of natural rubber, in particular to an automatic concentration system and a concentration method for skim rubber.
Background
The concentrated latex is a raw material of a latex product with rubber content of not less than 60 wt%, and the concentrated latex is produced by industrially concentrating fresh latex with rubber content of less than 30 wt% by a centrifuge, and simultaneously, a byproduct, namely skim latex, is generated. 600kg of skim latex is generated after each ton of fresh latex raw materials are centrifugally concentrated, the content of rubber in the skim latex is about 4-5.5 wt%, which is about 24-33 kg of dry rubber, and the recovered rubber in the skim latex has certain economic benefit and can avoid waste of rubber resources. Because the rubber content in the skim rubber is low, the skim rubber cannot be solidified by using organic acid (formic acid or acetic acid), and the skim rubber is solidified by using sulfuric acid at present, so that the aim of recovering skim rubber is fulfilled. However, the performance of the sulfuric acid coagulated skim rubber is poor, and the use of a large amount of sulfuric acid can cause the content of sulfate radicals in wastewater to be higher, which is not beneficial to the recovery of biological energy in the wastewater (the wastewater is fermented to generate biogas), and increases the difficulty of wastewater treatment. Therefore, a device for recycling skim rubber is needed to solve the above problems.
Disclosure of Invention
In view of this, the present invention provides an automatic concentration system and a concentration method for colloidal-clear, which solve the above problems.
The technical scheme of the invention is realized as follows:
the utility model provides an automatic concentrated system of clear glue, includes head tank, circulating pump, heat exchanger, milipore filter subassembly, scavenging pump, washing water pitcher and clear liquid jar, head tank, circulating pump, heat exchanger and milipore filter subassembly connect gradually, the milipore filter subassembly still connects gradually with washing water pitcher and scavenging pump. The invention can automatically concentrate the skim latex to the target concentration, so that organic acid can be used for solidification in the following process, and sulfuric acid is not used.
Further, the ultrafiltration membrane is an inorganic ultrafiltration membrane, preferably made of one or more of alumina, quartz, asbestos, mica and silicon carbide, and more preferably made of alumina.
Further, the membrane density of the ultrafiltration membrane is 0.15-3.5 g/cm3The porosity is 35-95%, the pore diameter of the membrane is 0.05-2 μm, and the preferred pore diameter of the membrane is 0.5-1.1 μm.
Further, the circulation pump and the purge pump may be constant pressure pumps.
The invention discloses an automatic concentration method of skim serum, which uses an automatic concentration system and comprises the following steps:
(1) putting the skim latex into a raw material tank, and sending the skim latex through a heat exchanger by a circulating pump for heat exchange;
(2) then sending to an ultrafiltration membrane component to obtain a clear permeate and a concentrated solution, pumping the clear permeate into a clear solution tank, and pumping the concentrated solution back to the raw material tank again;
(3) when the skim latex in the raw material tank is concentrated to one third to one sixth of the original volume, the concentrated skim latex is obtained;
(4) and (4) washing the membrane of the ultrafiltration membrane component by a washing pump and a washing water tank, and performing circulating operation.
Further, the temperature of the skim latex after heat exchange in the step (1) is 23-60 ℃.
Further, the membrane surface flow velocity of the ultrafiltration membrane component is 2-6 m/s.
Furthermore, the membrane surface pressure difference of the ultrafiltration membrane component is 0.025-0.045 MPa.
Further, the concentration time is 2-4 h.
Compared with the prior art, the invention has the beneficial effects that:
(1) the concentration system is used for automatically concentrating the skim latex to the target concentration to obtain the concentrated skim latex with high rubber content and low non-rubber component content, so that organic acid (formic acid or acetic acid) can be used for solidification in the following process, sulfuric acid is avoided, and the concentrated skim latex is further dehydrated and dried to obtain high-quality skim latex (dry latex). Wherein, the skim latex is filtered and removed along with the clear liquid by passing through a cross-flow inorganic membrane with a certain pore size to remove proteins with smaller molecules, precipitated metal ions and soluble non-latex components. The whole process does not need manual operation, and the glue concentration and the cleaning work of the net membrane of the ultrafiltration membrane component are automatically finished by the system.
(2) By adopting the concentration system and the method, not only the skim latex concentration recovery efficiency is high, but also the quality of the prepared skim latex is high, and the mechanical property and the aging resistance of the vulcanized skim latex are improved.
(3) The invention reduces the content of heavy metal ions, protein and other non-rubber components in the skim rubber, and improves the aging resistance and resilience of the skim rubber.
(4) The invention improves the rubber content in the skim latex, reduces the ammonia content, reduces the acid consumption for neutralization and reduces the coagulation cost of the skim latex.
(5) The invention obviously reduces the sulfate radical content in the wastewater, promotes anaerobic fermentation, increases the recovery of biological energy (methane) in the wastewater and reduces the difficulty of wastewater treatment.
(6) The system of the invention realizes automatic operation, can reduce labor intensity and labor cost.
(7) The inorganic film used in the invention has good aging resistance and deformation resistance and long service life.
Drawings
FIG. 1 is a schematic diagram of an automated concentration system for skim latex according to the present invention.
FIG. 2 is a schematic representation of the separation using an ultrafiltration membrane module according to the present invention.
In the figure, 1 a raw material tank, 2 circulating pumps, 3 heat exchangers, 4 ultrafiltration membrane components, 5 cleaning pumps, 6 a cleaning water tank and 7 a clear liquid tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The following describes the implementation of the present invention in detail with reference to specific embodiments.
The experimental methods used in the examples of the present invention are all conventional methods unless otherwise specified.
The materials, reagents and the like used in the examples of the present invention can be obtained commercially without specific description.
As shown in fig. 1-2, an automatic concentration system for skim latex comprises a raw material tank 1, a circulating pump 2, a heat exchanger 3, an ultrafiltration membrane component 4, a cleaning pump 5, a cleaning water tank 6 and a clear liquid tank 7, wherein the raw material tank 1, the circulating pump 2, the heat exchanger 3 and the ultrafiltration membrane component 4 are sequentially connected, the ultrafiltration membrane component 4 is made of inorganic materials, and the membrane density is 0.15-3.5 g/cm3The porosity of the film is 35-95%, and the pore diameter of the film is 0.05-2 μm; the circulating pump and the cleaning pump can be constant pressure pumps, the power can be automatically adjusted along with the flow change, and the pumping pressure is stabilized. The cleaning pump is shared by two processes of forward washing and back washing. The circulating pump and the cleaning pump are constant pressure pumps.
The automatic concentration system setting of clear above-mentioned glue:
step1 sets system single circulation concentration parameters, including setting glue concentration time, forward cleaning time, reverse cleaning time, circulation pump pressure, cleaning pump forward cleaning pressure, reverse cleaning pressure and other parameters.
Step2 sets the total number of cycles in the system.
Step3 starts the system and adjusts the valve to maximize the outflow rate of the supernatant.
Step4 opens the exhaust valve to exhaust the gas in the system piping.
And Step5, discharging the concentrated skim latex after the concentration is finished, and then performing the processes of solidification, dehydration, drying and the like to recover the rubber.
The working method of the system comprises the following steps:
(1) placing the skim latex in a stock tank 1, and sending the skim latex through a heat exchanger 3 by a circulating pump 2 for heat exchange, wherein the temperature of the skim latex after heat exchange is 23-60 ℃;
(2) then the obtained product is sent to an ultrafiltration membrane component 4, the membrane surface pressure difference is controlled to be 0.025-0.045 MPa, and the membrane surface flow velocity is controlled to be 2-6 m/s, so that a permeate clear liquid and a concentrated solution are obtained, the permeate clear liquid is pumped into a clear liquid tank 6, and the concentrated solution is pumped back to a raw material tank 1 again;
(3) when the skim latex in the raw material tank 1 is concentrated to one third to one sixth of the original volume, the concentration time is 2-4 h, and the concentrated skim latex is obtained;
(4) and (3) washing the ultrafiltration membrane module 4 by a washing pump 5 and a washing water tank 7, and performing cycle operation.
The working principle is as follows: as shown in FIG. 2, the skim latex is passed through a cross-flow inorganic membrane with a certain pore size, and the proteins with smaller molecules, the precipitated metal ions and the soluble non-latex components are removed by filtration with the clear liquid. Specifically, the skim latex is obtained from a concentrated milk processing plant and is filled into a raw material tank 1, the skim latex is pumped into an ultrafiltration membrane assembly 4 through a circulating pump 2, part of small particles and water-soluble non-gel components are removed through the ultrafiltration membrane assembly 4, the skim latex with relatively large rubber content returns to the raw material tank 1 again, the skim latex is concentrated to one third to one sixth of the original volume for a period of time, cleaning liquid is intermittently pumped through a cleaning pump 5 during concentration and passes through the ultrafiltration membrane assembly 4 to complete cleaning, waste liquid after cleaning is pumped into a clear liquid tank 7, and the cleaning liquid circulates in the cleaning pump, the ultrafiltration membrane assembly 4 and the clear liquid tank in the cleaning process. And cleaning liquid is pumped forward and backward by the cleaning pump 5, so that the cleaning liquid passes through the ultrafiltration membrane component 4 forward and backward to finish forward and backward washing. Further, the automatic cleaning of the ultrafiltration membrane component 4 is completed in an intermittent manner under the automatic control of the cleaning pump 5 and the cleaning water tank 6 during the concentration period, and the waste liquid after the cleaning is pumped into the clear liquid tank 7. And finally, solidifying the obtained concentrated skim latex by formic acid or acetic acid, and then preparing skim latex dry rubber through the working procedures of dehydration, drying and the like to achieve the purpose of recovering the rubber in the skim latex.
In conclusion, the invention is used for automatically concentrating the skim latex to the target concentration to obtain the concentrated skim latex with high rubber content and low non-rubber component content, so that organic acid (formic acid or acetic acid) can be used for solidification in the following process, sulfuric acid is avoided, and the concentrated skim latex is further dehydrated and dried to obtain high-quality skim latex (dry latex).
Example 1 (comparative example)
This embodiment does not use the automatic concentrated system of this application jiao qing, adopts traditional sulphuric acid solidification method to retrieve jiao qing: taking natural rubber skim latex raw materials (total solid content is 8.27%, dry gum content is 5.13%, ammonia content is 0.22%), removing ammonia, adding 10 wt% sulfuric acid solution, mixing with skim latex uniformly, diluting concentrated sulfuric acid (95 wt%) per ton of skim latex to 10 wt% before use, curing for 4 days after solidification, and then creping, dehydrating, granulating and drying.
Examples 2 to 8
Adopt above-mentioned glueclear automatic concentration system (membrane density is 2.05 g/cm)3And film porosity of 70%), adjusting the technological parameters respectively: the membrane pore size, membrane area pressure difference, concentration time, and process parameters of examples 2 to 8 are shown in Table 1 below. The concentration recovery efficiency and the skim rubber quality after concentration treatment of each example are analyzed, and the mechanical properties and the aging resistance of vulcanized rubber are detected.
Table 1 examples 2-8 process parameters
(1) Analysis of concentration recovery efficiency
And respectively detecting the total solid content, the dry glue content and the ammonia content of the concentrated skim latex of each embodiment, and calculating the dry glue recovery rate and the ammonia removal rate. The results are shown in Table 3.
Wherein, the recovery rate of the dry glue is the mass of the dry glue after concentration/the mass of the dry glue before concentration
Ammonia removal rate ═ 1- (after-concentration skim serum volume × after-concentration skim serum ammonia content)/(before-concentration skim serum volume × before-concentration skim serum ammonia content)
TABLE 2 analysis of the recovery efficiency of the concentration
The results show that the total solid content, the dry glue content, the ammonia content and the ammonia removal rate are obviously improved after the concentration in the embodiments 2 to 8, particularly the dry glue recovery rate is high, and the concentration system has high concentration and recovery efficiency by adopting the invention.
(2) Concentrated skim rubber
The impurity content, ash content, volatile matter content, nitrogen content, initial plasticity value and antioxidant index of the concentrated skim latex of each example are respectively detected. The results are shown in Table 3.
TABLE 3 six indexes of skim rubber after concentration treatment
The above results show that the impurity content, ash content, volatile content and nitrogen content are significantly reduced after the concentration in examples 2 to 8, and the initial plastic value P is0And the antioxidant index PRI is obviously improved. By adopting the concentration system disclosed by the invention, the quality of the prepared skim rubber is high, and particularly, the antioxidant index PRI of the embodiment 2-8 is obviously higher than that of the grade 1 skim rubber (the PRI is more than or equal to 35).
(3) Mechanical properties of vulcanized rubber before and after aging
Vulcanized rubber is prepared by respectively concentrating the rubber of each example, and the tensile strength, the elongation at break and the tearing strength are detected. The results are shown in Table 4.
1) Cleaning vulcanized rubber: mixing the skim rubber on an open mill for 13min according to a conventional process, standing for 2h, measuring vulcanization parameters at 145 ℃ by using a vulcanizer, and vulcanizing the rubber mixture on a flat vulcanizing machine under the vulcanization condition of 145 ℃ x t90。
2) The tensile property is determined according to GB/T528-2009 determination of tensile stress strain property of vulcanized rubber or thermoplastic rubber; the tear strength was measured according to GB/T529-2008 "determination of tear Strength of vulcanized rubber or thermoplastic rubber (trouser, Right Angle and crescent test specimens"), using a Right Angle test specimen.
TABLE 4 mechanical Properties before and after aging of the clear vulcanized rubber
The above results show that the vulcanized rubber of examples 2 to 8 has good tensile strength and elongation at break before and after aging, and also has excellent tear strength. By adopting the concentration system, the mechanical property of the vulcanized skim rubber is improved, and the aging resistance of the vulcanized skim rubber is improved.
In conclusion, by adopting the concentration system and the concentration process, not only is the skim latex concentration recovery efficiency high, but also the quality of the prepared skim latex is high, and the mechanical property and the aging resistance of the vulcanized skim latex are improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The utility model provides a glue clear automatic concentrated system, its characterized in that, includes head tank, circulating pump, heat exchanger, milipore filter subassembly, scavenging pump, washing water pitcher and clear liquid jar, head tank, circulating pump, heat exchanger and milipore filter subassembly connect gradually, the milipore filter subassembly still connects gradually with washing water pitcher and scavenging pump.
2. The automatic skim latex concentration system of claim 1, wherein the ultrafiltration membrane is an inorganic ultrafiltration membrane.
3. The automatic skim serum concentration system according to claim 2, wherein the membrane density of the ultrafiltration membrane is 0.15-3.5 g/cm3The porosity is 35-95% and the membrane aperture is 0.05-2 μm.
4. The automatic skim latex concentration system of claim 2, wherein the ultrafiltration membrane is made of one or more of alumina, quartz, asbestos, mica, and silicon carbide.
5. The automated skim latex concentration system of claim 1, wherein the circulation pump and the purge pump can be constant pressure pumps.
6. An automatic concentration method of skim latex, which comprises the steps of using the automatic concentration system of skim latex of any one of claims 1 to 5:
(1) putting the skim latex into a raw material tank, and sending the skim latex through a heat exchanger by a circulating pump for heat exchange;
(2) then sending to an ultrafiltration membrane component to obtain a clear permeate and a concentrated solution, pumping the clear permeate into a clear solution tank, and pumping the concentrated solution back to the raw material tank again;
(3) when the skim latex in the raw material tank is concentrated to one third to one sixth of the original volume, the concentrated skim latex is obtained;
(4) and (4) washing the membrane of the ultrafiltration membrane component by a washing pump and a washing water tank, and performing circulating operation.
7. The automatic skim latex concentration method according to claim 6, wherein the temperature of skim latex after heat exchange in the step (1) is 23-60 ℃.
8. The automated skim serum concentration method according to claim 6, wherein the membrane surface flow rate of the ultrafiltration membrane module is 2 to 6 m/s.
9. The automated skim serum concentration method according to claim 6, wherein the membrane surface pressure difference of the ultrafiltration membrane module is 0.025 to 0.045 MPa.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110644927.9A CN113385035A (en) | 2021-06-09 | 2021-06-09 | Automatic colloidal-clear concentration system and concentration method thereof |
| PCT/CN2021/108066 WO2022257242A1 (en) | 2021-06-09 | 2021-07-23 | Automatic skim latex concentration system and concentration method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110644927.9A CN113385035A (en) | 2021-06-09 | 2021-06-09 | Automatic colloidal-clear concentration system and concentration method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN113385035A true CN113385035A (en) | 2021-09-14 |
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| CN202110644927.9A Pending CN113385035A (en) | 2021-06-09 | 2021-06-09 | Automatic colloidal-clear concentration system and concentration method thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113385035A (en) |
| WO (1) | WO2022257242A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000317274A (en) * | 1999-05-11 | 2000-11-21 | Daicel Chem Ind Ltd | Ultrafilter for latex |
| CN102504049A (en) * | 2011-11-17 | 2012-06-20 | 海南大学 | Method for recovering skim rubber |
| WO2013055202A1 (en) * | 2011-10-11 | 2013-04-18 | Sime Darby Malaysia Berhad | A method of recovering rubber from skim natural rubber latex |
| CN111499026A (en) * | 2020-05-29 | 2020-08-07 | 涧纳(上海)环保科技有限公司 | Recovery device and treatment method of dilute acrylic emulsion |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2926813B1 (en) * | 2008-01-28 | 2011-10-21 | Inst Francais Du Petrole | PROCESS FOR SEPARATING PROPANE AND PROPYLENE USING A DISTILLER COLUMN AND A MEMBRANE SEPARATION UNIT |
| MY183968A (en) * | 2012-10-29 | 2021-03-17 | Sime Darby Malaysia Berhad | An improved method of recovering rubber from skim natural rubber latex |
| CN103724459B (en) * | 2013-12-25 | 2015-11-18 | 江苏久吾高科技股份有限公司 | The method of the clear utilization of wastewater resource of a kind of glue |
| CN212609891U (en) * | 2020-05-29 | 2021-02-26 | 涧纳(上海)环保科技有限公司 | Recovery unit of rare acrylic acid emulsion |
-
2021
- 2021-06-09 CN CN202110644927.9A patent/CN113385035A/en active Pending
- 2021-07-23 WO PCT/CN2021/108066 patent/WO2022257242A1/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000317274A (en) * | 1999-05-11 | 2000-11-21 | Daicel Chem Ind Ltd | Ultrafilter for latex |
| WO2013055202A1 (en) * | 2011-10-11 | 2013-04-18 | Sime Darby Malaysia Berhad | A method of recovering rubber from skim natural rubber latex |
| CN103917564A (en) * | 2011-10-11 | 2014-07-09 | 森达美马来西亚有限公司 | A method of recovering rubber from skim natural rubber latex |
| CN102504049A (en) * | 2011-11-17 | 2012-06-20 | 海南大学 | Method for recovering skim rubber |
| CN111499026A (en) * | 2020-05-29 | 2020-08-07 | 涧纳(上海)环保科技有限公司 | Recovery device and treatment method of dilute acrylic emulsion |
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| Publication number | Publication date |
|---|---|
| WO2022257242A1 (en) | 2022-12-15 |
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