CN103917564B - From the method for the clear natural rubber latex regenerated rubber of glue - Google Patents
From the method for the clear natural rubber latex regenerated rubber of glue Download PDFInfo
- Publication number
- CN103917564B CN103917564B CN201280050040.6A CN201280050040A CN103917564B CN 103917564 B CN103917564 B CN 103917564B CN 201280050040 A CN201280050040 A CN 201280050040A CN 103917564 B CN103917564 B CN 103917564B
- Authority
- CN
- China
- Prior art keywords
- glue
- membrane module
- latex
- retentate
- clear
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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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
- C08C1/02—Chemical or physical treatment of rubber latex before or during concentration
- C08C1/075—Concentrating
- C08C1/08—Concentrating with the aid of creaming agents
-
- 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
- C08C1/02—Chemical or physical treatment of rubber latex before or during concentration
- C08C1/075—Concentrating
- C08C1/10—Concentrating by centrifugation
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- 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)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The present invention relates to the method from the clear natural rubber latex regenerated rubber of glue.It is clear that described method comprises glue described in pre-treatment, along with add use membrane module or continuous print two membrane modules of ammonium laurate, to concentrate described glue clear, the glue using tetramethyl-thiuram disulfide (TMTD) and the process of zinc oxide (ZnO) dispersion to concentrate alternatively is clear, the latex that mixing is concentrated and fresh field latex, this mixture centrifugal is to obtain latex concentration thing.This latex concentration thing mixes with fresh latex concentration thing and uses ammonia treatment further, to obtain final latex concentration thing.
Description
Technical field
The present invention relates to the method from the clear natural rubber latex regenerated rubber of glue.More specifically, the present invention relates to and use the combination of membrane filtration technique and centrifugal separation technique from glue clear natural rubber latex regenerated rubber and the method described rubber transition being become latex enriched material.
Background technology
The clear natural rubber latex of glue or glue are clearly for making latex be separated into the byproduct produced in the process of enriched material and the clear concentrated natural rubber latex of glue comprising by centrifugation.Glue is clear and coherent often only comprise about 5% dry glue, and be usually regenerated as the clear crepe rubber of glue.
Well known in the artly sulfuric acid is used to pass through to solidify and by the clear regenerated rubber of glue.Then, at rubber as skim rubber by before sales, the rubber out of doors after dry described regeneration.But the skim rubber obtained from this clotting method owing to comprising a high proportion of non-rubber component of carrying secretly and acid content, and has poor quality.Skim rubber also has unexpected physicals, comprises the generation of disagreeable smell, this economic worth causing skim rubber low.In addition, the method also produces highly acid sewage, if this sewage can not be processed in an appropriate manner before being discharged in environment, can cause the pollution to environment.
Also by using protease to carry out clear the solidifying of glue, wherein complete the enzyme deproteinization that glue is clear.But, because this method needs use a large amount of enzymes and comprise deammoniation and sour coagulation step in the method, be uneconomic in this way.
Summary of the invention
Method from glue clear natural rubber latex regenerated rubber according to the present invention solves above-mentioned and other problem, and achieves progress in the art.Be by using the combination of membrane filtration technique and centrifugal separation technique to carry out from the clear natural rubber latex regenerated rubber of glue according to the advantage of method of the present invention, and rubber transition is become latex enriched material, thus reduce for from the solid needs of the acid cure of glue clear natural rubber latex regenerated rubber.The second advantage of this invention is that described method produces the sewage with the quality of improvement, and this sewage with the quality of improvement causes the pollution less to environment conversely.
According to the embodiment of the present invention, described method is carried out in the following manner.Described method starts clearly with glue described in pre-treatment.Then, along with frequently adding of ammonium laurate repeatedly makes described pretreated glue clearly through membrane module, to obtain retentate and penetrant.Mix described retentate and fresh field latex, and centrifugal to obtain latex concentration thing.Described latex concentration thing mixes further with fresh latex concentration thing, and with ammonia treatment to obtain final latex concentration thing.
According to another implementation of the invention, before described method is included in the described retentate of mixing and described fresh field latex further, makes described retentate stand the second stage and concentrate.Carry out the second stage by making described retentate through the second membrane module to concentrate, to obtain the second retentate and the second penetrant.Second retentate described in chemical treatment alternatively, and control to mix with fresh field latex.Centrifugal mixed described second retentate, to obtain latex concentration thing.Then, control described latex concentration thing further to mix with fresh latex concentration thing, to obtain final latex concentration thing.
In certain embodiments of the present invention, described method comprises by soaking described membrane module in the hydrogen peroxide of about 2% to 5% further; With with about 1% to 2% sodium hydroxide backwash or just rinsing described membrane module and cleaning described membrane module, to regenerate described membrane module for further use.
Accompanying drawing explanation
Illustrate in the following detailed description and show above-mentioned and other advantage of the present invention and feature in figures in the following:
Fig. 1 describes the schema according to single-stage concentration method of the present invention.
Fig. 2 describes the schema according to secondary concentration method of the present invention.
Embodiment
According to the invention provides by natural rubber latex being separated into the butterfat part that is rich in rubber and the clear part of glue and concentrated natural rubber latex, thus from the method for the clear natural rubber latex of glue or the clear regenerated rubber of glue.Described glue is clear and coherent often comprise about 5% dry glue.
The clear step of glue described in pre-treatment is comprised according to the method for embodiment of the present invention.In an embodiment of the invention, with ammonia and ammonium laurate pre-treating adhesive clear.Preferably, the ammonia of about 0.35% to 0.65% and the ammonium laurate of about 0.05% to 0.10% is used.By adding ammonia and ammonium laurate simply, to glue is clear, pre-treating adhesive is clear, then makes mixture even by stirring.Then, pretreated glue is made to stand clearly first step concentration technology.
In first step concentration technology, concentrated glue clear to about 11% to 13% drc.According to the embodiment of the present invention, by making glue clearly repeatedly carry out first step concentration technology through multitubular membrane module.Glue passes multitubular membrane module by means of pump clearly.The example of available pump in the present invention includes but not limited to diaphragm pump or centrifugal pump.For large-scale film device, preferred centrifugal pump.Multitubular membrane module can by any suitable material manufacture.In a preferred embodiment, multitubular membrane module is manufactured by pottery, and preferably has the aperture of about 0.05 μ.
When glue is clearly repeatedly through multitubular membrane module, during the ammonium laurate adding about 0.025% to 0.10% with the interval of 10 to 30 minutes is clear to glue.In an embodiment of the invention, the inlet pressure of multitubular membrane module is set as that about 2.5 bar to 4.5 cling to (2.5 × 10
5to 4.5 × 10
5pa).In a preferred embodiment, transmembrane pressure is set as about 1.5 to 3.0 bar (1.5 × 10
5to 3.0 × 10
5pa).
Continue first step concentration technology until obtain the transparent whey of about 60wt% to 70wt%, this transparent whey is removed as penetrant, leaves retentate clear as concentrated glue.
Before concentrated glue stands clearly second stage concentration technology, available ammonium laurate processes retentate further or concentrated glue is clear.Preferably, the ammonium laurate of about 0.025% to 0.10% join concentrated glue clear in clear to process glue.
In the concentration technology of the second stage, concentrated glue is concentrated into the drc about more than 20% clearly further.According to the embodiment of the present invention, by making the glue concentrated clearly repeatedly carry out second stage concentration technology through the second multitubular membrane module.Second multitubular membrane module can be the type identical with the film used in first step concentration technology, or can be any type be suitable for in the process.Concentrated glue passes the second multitubular membrane module by means of pump clearly.Diaphragm pump or centrifugal pump is included but not limited to the example of pump in the process.For large-scale film device, preferred centrifugal pump.Multitubular membrane module can by any suitable material manufacture.Of the present invention preferred embodiment in, multitubular membrane module is manufactured by pottery, and has the aperture of about 0.05 μ.This multitubular membrane module has the channel internal diameter of about 3.0 ~ 4.0mm and the total length of about 1.0 ~ 1.2m.
Preferably, concentrated glue clings to (2.5 × 10 at about 2.5 bar to 4.5 clearly
5to 4.5 × 10
5pa) through the second multitubular membrane module under inlet pressure.When glue is clearly repeatedly through the second multitubular membrane module, other ammonium laurate join concentrated glue clear in, so that concentrated glue is clear further.In a preferred embodiment, during the ammonium laurate adding 0.025% to 0.10% with the interval of 10 to 30 minutes is clear to concentrated glue.Continue second stage concentration technology, until obtain the second transparent whey of about 40wt% to 50wt%, this transparent whey is removed as the second penetrant, leaves the second retentate clear as glue concentrated further.
Before further concentrated glue mix with fresh field latex clearly, alternatively, the further glue concentrated described in the tetramethyl-thiuram disulfide (TMTD) of the 1:1 ratio of available 30% concentration and the process of zinc oxide (ZnO) dispersion is clear.Preferably, the glue using the TMTD/ZnO dispersion process of about 0.05wt% to 0.10wt% to concentrate further is clear.Depend on the quality that the further concentrated glue that obtains after concentration technology is clear, be such as present in glue concentrated further clear in the amount of voltaile fatty acid, carry out this step.Preferably, when the volatile fatty acid number in glue concentrated is further clear is more than 0.10, this step is carried out.Preferably, the concentrated glue after process mixes with the ratio of 1:9 part with fresh field latex clearly.
Then, the centrifugal mixed concentrated glue comprising fresh field latex is clear, to obtain latex concentration thing.Latex concentration thing mixes with the ratio of 1:9 part with fresh latex concentration thing.Then, add ammonia to mixed latex concentration thing to being greater than 0.60%m/m, to obtain final latex concentration thing.Therefore, the final latex concentration thing of acquisition comprises the dry glue more than 60%.
In yet another embodiment of the present invention, depend on feedstock mass in the process, first step concentration technology and second stage concentration technology can be carried out in a single step.
In single stage process, with ammonia and ammonium laurate, similarly pre-treating adhesive is clear.Preferably, the ammonia of about 0.35% to 0.65% and 20% ammonium laurate of about 0.05% to 0.10% is used.By add simply ammonia and ammonium laurate clear to glue in and pre-treating adhesive is clear, then make mixture even by stirring.Then, pretreated glue stands clearly single-stage concentration technology.
According to this embodiment of the present invention, clearly repeatedly carry out single-stage concentration technology through multitubular membrane module by making glue.Glue passes multitubular membrane module by means of pump clearly.The example of available pump in the process includes but not limited to diaphragm pump or centrifugal pump.For large-scale film device, preferred centrifugal pump.Multitubular membrane module can by any suitable material manufacture.Of the present invention preferred embodiment in, multitubular membrane module is manufactured by pottery, and has the aperture of about 0.05 μ.This multitubular membrane module has the channel internal diameter of about 3.0 ~ 4.0mm and the total length of about 1.0 ~ 1.2m.
When glue is clearly repeatedly through multitubular membrane module, add ammonium laurate clear to glue in.Preferably, when glue is clearly repeatedly through multitubular membrane module, during the ammonium laurate adding 20% concentration of about 0.025% to 0.10% with the interval of 10 minutes to 30 minutes is clear to glue.The inlet pressure of film is preferably set to about 2.5 bar to 4.5 and clings to (2.5 × 10
5to 4.5 × 10
5pa).In a preferred embodiment, in order to the permeate flux of the best, set transmembrane pressure as about 1.5 to 3.0 bar (1.5 × 10
5to 3.0 × 10
5pa).
Continue single-stage concentration technology until obtain the transparent whey of about 80wt% to 90wt%, this transparent whey is removed as penetrant, leaves retentate clear as concentrated glue.
Alternatively, the glue with concentrated described in the TMTD/ZnO dispersion process of the 1:1 ratio of 30% concentration is clear.Preferably, clear with the glue that the TMTD/ZnO dispersion process of about 0.05wt% to 0.10wt% is concentrated.Depend on the quality that the concentrated glue that obtains after concentration technology is clear, be such as present in concentrated glue clear in the amount of voltaile fatty acid, carry out this step.Preferably, when the volatile fatty acid number during concentrated glue is clear is more than 0.10, this step is carried out.Then, the concentrated glue after process preferably mixes with the ratio of 1:9 part with fresh field latex clearly.
The centrifugal mixed concentrated glue comprising fresh field latex is clear, to obtain latex concentration thing.Then, latex concentration thing mixes with the ratio of 1:9 part with fresh latex concentration thing.Then, add ammonia to being greater than 0.60%m/m, to obtain final latex concentration thing.Therefore, the final latex concentration thing of acquisition comprises the dry glue more than 60%.
In the present invention, the transparent whey of being produced by the clear concentration technology of glue can be used for regenerating the valuable biochemical products be included in wherein.Film becomes contaminated after a procedure.Contaminated film by soak in the hydrogen peroxide of about 2% to 5% and use the sodium hydroxide backwash of about 1 to 2% or just rinsing and regeneration membrane and by cleaning for further use.
In method according to the embodiment of the present invention, before glue mixes with fresh field latex clearly, concentrate glue by membranous system clear, and recentrifuge is latex concentration thing.Film is used to eliminate for from the solid needs of the acid cure of the clear regenerated rubber of glue as the method that concentrated glue is clear.Also contribute to the quality improving the sewage produced by described method.The contaminated film of the combined type cleaning of chemical preparations can be used, with concentrated with later of regeneration membrane.The regeneration of rubber becomes latex enriched material to be increase the technique be worth for rubber industry with by rubber transition.
There is provided the following examples to illustrate further and to describe specific embodiment of the present invention, and described embodiment should not be interpreted as limiting the invention to the detailed process, the conditioned disjunction component that describe in described embodiment by any way.
embodiment
embodiment 1: secondary concentration technique
The glue with 5% drc filters clearly 60 object wire cloths, and with the ammonia of 0.65% and the ammonium laurate pre-treatment of 0.1%.Then, the glue after process is clearly repeatedly through multitubular membrane module.There is with multitubular membrane module in this embodiment the channel internal diameter of aperture, the about 3.0 ~ 4.0mm of about 0.05 μ and the total length of about 1.0 ~ 1.2m.The inlet pressure of membrane module is set as about 3 bar (3 × 10
5pa).The ammonium laurate of about 0.05% joins Jiao Qingzhong with the interval of 30 minutes, clear with concentrated glue.
Continue this enrichment step, until obtain the transparent whey of about 60 ~ 70wt%, this transparent whey is removed as the first penetrant, leaves the first retentate comprising about 11% dry glue.
Then, with other 0.1% ammonium laurate process first retentate.Then, the first retentate after process is at about 3 bar (3 × 10
5pa) repeatedly through the second multitubular membrane module under inlet pressure.The ammonium laurate of about 0.05% joins in the first retentate with the interval of 30 minutes, so that concentrated glue is clear further.Carry out this further enrichment step, until obtain the second transparent whey of about 40 ~ 50wt%, this second transparent whey is removed as the second penetrant.The second retentate comprised more than 20% dry glue is also obtained after the second enrichment step.
Then, before the second retentate and fresh field latex mixs with the ratio of 1:9 part, the TMTD/ZnO(of use about 0.05% is with the ratio of 1:1) dispersion (30% concentration) process the second retentate.Then with the centrifugal mixed retentate comprising fresh field latex of skimming screw element (skimscrew) (being numbered the length of 12 or 12.5mm) selected, to obtain latex concentration thing.Then, the latex concentration thing after process mixes with the ratio of 1:9 part with fresh latex concentration thing further, and ammonification is to the ammonia more than 0.60%m/m, to obtain final latex concentration thing.
The final latex concentration thing obtained by this technique has the quality being comparable to common fresh latex concentration thing.Due to regeneration with change the clear crepe rubber of the clear plastic of glue and compare, become latex enriched material to obtain better price from the clear regenerated rubber of glue and by rubber transition, so this is the technique increasing value in rubber industry.
embodiment 2: single-stage concentration technology
In single stage process, on glue is clear, only carry out an enrichment step.Pre-treatment step in this technique is similar to secondary process with operational condition, except continuing the single enrichment step in single stage process until obtain the transparent whey of about 80 ~ 90wt%, and beyond this transparent whey is removed as penetrant.The retentate obtained in this single stage process comprises the dry glue more than 20%.
After enrichment step, before retentate and fresh field latex mixs with the ratio of 1:9 part, the TMTD/ZnO(of use about 0.05% is with the ratio of 1:1) dispersion (30% concentration) process the retentate obtained from enrichment step.Then with the skimming screw element selected (being numbered the length of 12 or 12.5mm) the centrifugal retentate comprising the mixing of fresh field latex, to obtain latex concentration thing.Then, the latex concentration thing after process mixes with the ratio of 1:9 part with fresh latex concentration thing further, and ammonification is to the ammonia more than 0.60%m/m, to obtain final latex concentration thing.The latex concentration thing obtained by single stage process has the quality of the latex concentration thing being comparable to common fresh latex concentration thing and the acquisition of two-stage process from the above mentioned.
Foregoing is description the present inventor being considered as to theme of the present invention, and thinks based on above-mentioned disclosure, other people can and will design packet containing alternative method of the present invention.
Claims (15)
1. by natural rubber latex being separated into the clear and concentrated natural rubber latex of rubber latex and glue, thus from the method for the clear regenerated rubber of glue, described method comprises:
Glue described in pre-treatment is clear, wherein, clear with glue described in the ammonia of 0.35wt% to 0.65wt% and the ammonium laurate pre-treatment of 0.05wt% to 0.1wt%;
Along with frequently adding of ammonium laurate repeatedly makes pretreated described glue clearly through membrane module, to obtain retentate and penetrant, wherein, described method comprises secondary concentration method and single-stage concentration method: in the first step concentration technology of secondary concentration method, during the described ammonium laurate adding 0.025wt% to 0.1wt% with the interval of 10 to 30 minutes is clear to pretreated described glue, until obtain first penetrant of 60wt% to 70wt%, and the first retentate has the drc of 11% to 13%, in the second stage concentration technology of secondary concentration method, the described ammonium laurate of 0.025wt% to 0.1wt% is added in described first retentate with the interval of 10 to 30 minutes, until obtain second penetrant of 40wt% to 50wt%, and the second retentate has the drc more than 20%, in single-stage concentration method, during the described ammonium laurate adding 0.025wt% to 0.1wt% with the interval of 10 to 30 minutes is clear to pretreated described glue, until obtain the 3rd penetrant of 80wt% to 90wt%, and the 3rd retentate has the drc more than 20%,
Mix described retentate and fresh field latex;
Retentate after mixed by centrifugal is to obtain latex concentration thing;
Mix described latex concentration thing and fresh latex concentration thing; With
With the latex concentration thing after mixed by ammonia treatment to obtain final latex concentration thing.
2. the method for claim 1, before being included in the step of the described retentate of mixing and fresh field latex further, with retentate described in tetramethyl-thiuram disulfide (TMTD) and the process of zinc oxide (ZnO) dispersion.
3. the method for claim 1, comprises further:
Before the step mixing described retentate and fresh field latex, along with frequently adding of other ammonium laurate repeatedly makes described first retentate through the second membrane module, to obtain the second retentate and the second penetrant.
4. method as claimed in claim 3, comprises further with the second retentate described in tetramethyl-thiuram disulfide (TMTD) and the process of zinc oxide (ZnO) dispersion.
5. method as claimed in claim 3, comprises further:
Make described first retentate by described second membrane module before, with the first retentate described in ammonium laurate pre-treatment.
The method of claim 1, wherein 6. clear with glue described in the ammonia of 0.35wt% to 0.65wt% and the ammonium laurate pre-treatment of 0.025wt% to 0.1wt%.
7. the method for claim 1, wherein described membrane module is multitubular film.
8. method as claimed in claim 7, wherein, described membrane module has 2.5 × 10
5to 4.5 × 10
5inlet pressure within the scope of Pa.
9. method as claimed in claim 3, wherein, described second membrane module is multitubular film.
10. method as claimed in claim 9, wherein, described second membrane module has 2.5 × 10
5to 4.5 × 10
5inlet pressure within the scope of Pa.
11. methods as claimed in claim 3, wherein, the ratio of the amount of described second retentate and described fresh field latex is 1:9.
12. methods as claimed in claim 7, wherein, described multitubular membrane module comprises diaphragm pump or centrifugal pump.
13. methods as claimed in claim 9, wherein, described second multitubular membrane module comprises diaphragm pump or centrifugal pump.
14. the method for claim 1, comprise further:
Clean described membrane module, described cleaning is carried out as follows:
By soaking described membrane module in the hydrogen peroxide of 2% to 5%; With
Sodium hydroxide backwash with 1% to 2% or just rinsing described membrane module to regenerate described membrane module for further use.
15. methods as claimed in claim 3, comprise further:
Clean described membrane module, described cleaning is carried out as follows:
By soaking described second membrane module in the hydrogen peroxide of 2% to 5%; With
Sodium hydroxide backwash with 1% to 2% or just rinsing described second membrane module to regenerate described second membrane module for further use.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| MYPI2011004876A MY183918A (en) | 2011-10-11 | 2011-10-11 | A method of recovering rubber from skim natural rubber latex |
| MYPI2011004876 | 2011-10-11 | ||
| PCT/MY2012/000259 WO2013055202A1 (en) | 2011-10-11 | 2012-10-03 | A method of recovering rubber from skim natural rubber latex |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103917564A CN103917564A (en) | 2014-07-09 |
| CN103917564B true CN103917564B (en) | 2016-04-20 |
Family
ID=47178822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280050040.6A Expired - Fee Related CN103917564B (en) | 2011-10-11 | 2012-10-03 | From the method for the clear natural rubber latex regenerated rubber of glue |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN103917564B (en) |
| IN (1) | IN2014KN00727A (en) |
| MY (1) | MY183918A (en) |
| WO (1) | WO2013055202A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104693321A (en) * | 2013-12-05 | 2015-06-10 | 海南大学 | Method for improving properties of skim rubber |
| CN104693324B (en) * | 2013-12-06 | 2017-07-14 | 中国石油天然气股份有限公司 | A kind of method for adjusting polybutadiene super large grain size latex surface tension |
| CN104177515B (en) * | 2014-08-20 | 2016-09-28 | 海南大学 | A kind of environment-friendly type processing method of Heveatex resource hierarchy time complete utilization |
| MY173398A (en) * | 2015-06-18 | 2020-01-22 | Sime Darby Plantation Berhad | A process and system for concentrating epoxidized natural rubber latex into epoxidized natural rubber latex concentrate |
| CN113385035A (en) * | 2021-06-09 | 2021-09-14 | 海南天然橡胶产业集团股份有限公司 | Automatic colloidal-clear concentration system and concentration method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2932678A (en) * | 1956-11-05 | 1960-04-12 | British Rubber Prod Res | Process of preserving freshly harvested rubber latex |
| GB1336823A (en) * | 1972-04-12 | 1973-11-14 | Alfa Laval Ab | Double concentration of latex |
| GB1517025A (en) * | 1975-08-20 | 1978-07-05 | Malaysia Rubber Res Inst | Preservation of natural rubber latex |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005007705A1 (en) * | 2003-07-21 | 2005-01-27 | B.C. Sekhar Sdn Bhd | Improvements to centrifugation of synthetic rubber latex |
| WO2005007703A1 (en) * | 2003-07-21 | 2005-01-27 | B.C. Sekhar Sdn Bhd | Method of producing deproteinised natural rubber in solid and latex form |
| AU2003256222A1 (en) * | 2003-07-21 | 2005-02-04 | B.C. Sekhar Sdn Bhd | Improvements to centrifugation of rubber latex |
| BRPI0815796B1 (en) * | 2007-08-30 | 2018-09-25 | Cabot Corp | elastomeric composite and method for its production |
-
2011
- 2011-10-11 MY MYPI2011004876A patent/MY183918A/en unknown
-
2012
- 2012-10-03 WO PCT/MY2012/000259 patent/WO2013055202A1/en active Application Filing
- 2012-10-03 IN IN727KON2014 patent/IN2014KN00727A/en unknown
- 2012-10-03 CN CN201280050040.6A patent/CN103917564B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2932678A (en) * | 1956-11-05 | 1960-04-12 | British Rubber Prod Res | Process of preserving freshly harvested rubber latex |
| GB1336823A (en) * | 1972-04-12 | 1973-11-14 | Alfa Laval Ab | Double concentration of latex |
| GB1517025A (en) * | 1975-08-20 | 1978-07-05 | Malaysia Rubber Res Inst | Preservation of natural rubber latex |
Also Published As
| Publication number | Publication date |
|---|---|
| IN2014KN00727A (en) | 2015-10-02 |
| MY183918A (en) | 2021-03-17 |
| CN103917564A (en) | 2014-07-09 |
| WO2013055202A1 (en) | 2013-04-18 |
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