CN103917564A - A method of recovering rubber from skim natural rubber latex - Google Patents
A method of recovering rubber from skim natural rubber latex Download PDFInfo
- Publication number
- CN103917564A CN103917564A CN201280050040.6A CN201280050040A CN103917564A CN 103917564 A CN103917564 A CN 103917564A CN 201280050040 A CN201280050040 A CN 201280050040A CN 103917564 A CN103917564 A CN 103917564A
- Authority
- CN
- China
- Prior art keywords
- latex
- membrane module
- glue
- 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.)
- Granted
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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 a method of recovering rubber from skim natural rubber latex. The method comprises pre-treating the skim latex, concentrating the skim latex using one membrane module or two membrane modules in series with addition of ammonium laureate, optionally treating the concentrated skim latex with a tetramethylthiuramdisulphide (TMTD) and zinc oxide (ZnO) dispersion, blending the concentrated latex with fresh field latex, centrifuging the blend to obtain a latex concentrate. The latex concentrate if further blended with a fresh latex concentrate and treated with ammonia to obtain the final latex concentrate.
Description
Technical field
The present invention relates to from the method for the clear natural rubber latex regenerated rubber of glue.More specifically, the combination that the present invention relates to use membrane filtration technique and centrifugal separation technique is from the clear natural rubber latex regenerated rubber of glue and described rubber is transformed into the method for latex enriched material.
Background technology
The clear natural rubber latex of glue or glue are clearly for comprising the byproduct that makes latex produce in being separated into the process of enriched material and the clear concentrated natural rubber latex of glue by centrifugation.Glue is clear and coherent often only comprises approximately 5% dry glue, and is conventionally regenerated as the clear crepe rubber of glue.
Well known in the art use sulfuric acid by solidifying by the clear regenerated rubber of glue.Then, at rubber as skim rubber by before sales, the rubber after dry described regeneration out of doors.But the skim rubber obtaining from this clotting method is owing to comprising a high proportion of non-rubber component of carrying secretly and acid content, and there is poor quality.Skim rubber also has unexpected physicals, comprises the generation of disagreeable smell, and this causes the economic worth that skim rubber is low.In addition, the method also produces highly acid sewage, if this sewage can not be processed in suitable mode before being discharged in environment, can cause the pollution to environment.
Also can, by using protease to carry out clear the solidifying of glue, wherein complete the enzyme deproteinization that glue is clear.But, because this method need to be used a large amount of enzymes and comprise in the method deammoniation and sour coagulation step, so this method is uneconomic.
Summary of the invention
Method from the clear natural rubber latex regenerated rubber of glue according to the present invention has solved above-mentioned and other problem, and has obtained in the art progress.The advantage of the method according to this invention is that the combination by using membrane filtration technique and centrifugal separation technique is carried out from the clear natural rubber latex regenerated rubber of glue, and rubber is transformed into latex enriched material, thereby reduce the solid needs of acid cure for from the clear natural rubber latex regenerated rubber of glue.The second advantage of this invention is the sewage that described method produces the quality with improvement, and this sewage with the quality of improvement causes the pollution less to environment conversely.
According to the embodiment of the present invention, carry out in the following manner described method.Described method starts clearly with glue described in pre-treatment.Then, along with repeatedly making frequently adding of ammonium laurate described pretreated glue clearly through membrane module, to obtain retentate and penetrant.Mix described retentate and fresh field latex, and centrifugal to obtain latex enriched material.Described latex enriched material further mixes with fresh latex enriched material, and with ammonia treatment to obtain final latex enriched material.
According to another implementation of the invention, before described method is further included in and mixes described retentate and described fresh field latex, make described retentate stand the second stage and concentrate.Concentrate by making described retentate carry out the second stage through the second membrane module, to obtain the second retentate and the second penetrant.The second retentate described in chemical treatment, and control alternatively mixes with fresh field latex.Centrifugal mixed described the second retentate, to obtain latex enriched material.Then, further control described latex enriched material and mix with fresh latex enriched material, to obtain final latex enriched material.
In some embodiments of the present invention, described method further comprises by soak described membrane module in approximately 2% to 5% hydrogen peroxide; With sodium hydroxide backwash with approximately 1% to 2% or just rinsing described membrane module and cleaning described membrane module, with the described membrane module of regenerating for further use.
Brief description of the drawings
In the following detailed description explanation and following shown in the drawings of above-mentioned and other advantage and feature of the present invention:
Fig. 1 describes according to the schema of single-stage concentration method of the present invention.
Fig. 2 describes according to the schema of secondary concentration method of the present invention.
Embodiment
Be rich in the butterfat part of rubber and the clear part of glue and concentrated natural rubber latex according to the invention provides by natural rubber latex is separated into, thereby from the method for the clear natural rubber latex of glue or the clear regenerated rubber of glue.Clear and coherent approximately 5% the dry glue that often comprises of described glue.
Comprise the clear step of glue described in pre-treatment according to the method for embodiment of the present invention.In an embodiment of the invention, clear with ammonia and ammonium laurate pre-treating adhesive.Preferably, use approximately 0.35% to 0.65% ammonia and approximately 0.05% to 0.10% ammonium laurate.By adding simply ammonia and ammonium laurate, to glue is clear, pre-treating adhesive is clear, then makes mixture even by stirring.Then, make pretreated glue stand clearly first step concentration technology.
In first step concentration technology, concentrated glue is clear to about drc of 11% to 13%.According to the embodiment of the present invention, by making glue clearly repeatedly carry out first step concentration technology through multitube shape membrane module.Glue passes multitube shape 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, preferably centrifugal pump.Multitube shape membrane module can be manufactured by any suitable material.In a preferred embodiment, multitube shape membrane module is manufactured by pottery, and preferably has the aperture of approximately 0.05 μ.
When glue is clearly repeatedly when the multitube shape membrane module, add with the interval of 10 to 30 minutes approximately 0.025% to 0.10% ammonium laurate clear to glue in.In an embodiment of the invention, the inlet pressure of multitube shape membrane module is set as approximately 2.5 bar to 4.5 bar (2.5 × 10
5to 4.5 × 10
5pa).In a preferred embodiment, transmembrane pressure is set as approximately 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 further process retentate or concentrated glue clear.Preferably, to join concentrated glue clear to process glue in clear for approximately 0.025% to 0.10% ammonium laurate.
In the concentration technology of the second stage, concentrated glue is clearly further concentrated into the drc that approximately exceedes 20%.According to the embodiment of the present invention, by making concentrated glue clearly repeatedly carry out second stage concentration technology through the second multitube shape membrane module.The second multitube shape membrane module can be the type identical with the film using in first step concentration technology, or can be any type that is suitable for being used in described technique.Concentrated glue passes the second multitube shape membrane module by means of pump clearly.The example that is used in the pump in described method includes but not limited to diaphragm pump or centrifugal pump.For large-scale film device, preferably centrifugal pump.Multitube shape membrane module can be manufactured by any suitable material.Of the present invention preferred embodiment in, multitube shape membrane module is manufactured by pottery, and has the aperture of approximately 0.05 μ.This multitube shape membrane module has the passage internal diameter of about 3.0～4.0mm and the about total length of 1.0～1.2m.
Preferably, concentrated glue is clearly at approximately 2.5 bar to 4.5 bar (2.5 × 10
5to 4.5 × 10
5pa) under inlet pressure, pass the second multitube shape membrane module.When glue is clearly repeatedly when the second multitube shape membrane module, other ammonium laurate join concentrated glue clear in, so that further concentrated glue is clear.In a preferred embodiment, with the interval of 10 to 30 minutes add 0.025% to 0.10% ammonium laurate clear to concentrated glue in.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 further concentrated glue.
Before further concentrated glue mixes with fresh field latex clearly, alternatively, it is clear that the tetramethyl-thiuram disulfide (TMTD) of the 1:1 ratio of available 30% concentration and zinc oxide (ZnO) dispersion are processed described further concentrated glue.Preferably, process further concentrated glue by the TMTD/ZnO dispersion of about 0.05wt% to 0.10wt% clear.Depend on the further concentrated clear quality of glue obtaining after concentration technology, for example, be present in the amount of the voltaile fatty acid of further concentrated glue in clear, carry out this step.Preferably, in the time that the volatile fatty acid number in further concentrated glue is clear exceedes 0.10, carry out this step.Preferably, concentrated glue after treatment mixes with the ratio of 1:9 part with fresh field latex clearly.
Then, the centrifugal mixed concentrated glue that comprises fresh field latex is clear, to obtain latex enriched material.Latex enriched material mixes with the ratio of 1:9 part with fresh latex enriched material.Then, add ammonia to mixed latex enriched material to being greater than 0.60%m/m, to obtain final latex enriched material.Therefore, the final latex enriched material of acquisition comprises the dry glue that exceedes 60%.
In yet another embodiment of the present invention, depend on the feed quality being used in described method, can in single step, carry out first step concentration technology and second stage concentration technology.
In single-stage technique, similarly pre-treating adhesive is clear to use ammonia and ammonium laurate.Preferably, use approximately 0.35% to 0.65% ammonia and approximately 0.05% to 0.10% 20% ammonium laurate.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, by making glue clearly repeatedly carry out single-stage concentration technology through multitube shape membrane module.Glue passes multitube shape membrane module by means of pump clearly.The example that can be used on the pump in described method includes but not limited to diaphragm pump or centrifugal pump.For large-scale film device, preferably centrifugal pump.Multitube shape membrane module can be manufactured by any suitable material.Of the present invention preferred embodiment in, multitube shape membrane module is manufactured by pottery, and has the aperture of approximately 0.05 μ.This multitube shape membrane module has the passage internal diameter of about 3.0～4.0mm and the about total length of 1.0～1.2m.
When glue is clearly repeatedly when the multitube shape membrane module, add ammonium laurate clear to glue in.Preferably, when glue is clearly repeatedly when the multitube shape membrane module, add with the interval of 10 minutes to 30 minutes the ammonium laurate of approximately 0.025% to 0.10% 20% concentration clear to glue in.The inlet pressure of film is preferably set to approximately 2.5 bar to 4.5 bar (2.5 × 10
5to 4.5 × 10
5pa).In a preferred embodiment, for best permeate flux, setting transmembrane pressure is approximately 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, process described concentrated glue by the TMTD/ZnO dispersion of the 1:1 ratio of 30% concentration clear.Preferably, process concentrated glue by the TMTD/ZnO dispersion of about 0.05wt% to 0.10wt% clear.Depend on the clear quality of concentrated glue obtaining after concentration technology, for example, be present in the amount of the voltaile fatty acid of concentrated glue in clear, carry out this step.Preferably, when the volatile fatty acid number in concentrated glue is clear exceedes 0.10, carry out this step.Then, concentrated glue after treatment preferably mixes with the ratio of 1:9 part with fresh field latex clearly.
The centrifugal mixed concentrated glue that comprises fresh field latex is clear, to obtain latex enriched material.Then, latex enriched material mixes with the ratio of 1:9 part with fresh latex enriched material.Then, add ammonia to being greater than 0.60%m/m, to obtain final latex enriched material.Therefore, the final latex enriched material of acquisition comprises the dry glue that exceedes 60%.
The transparent whey of being produced by the clear concentration technology of glue in the present invention, can be used for regeneration and is included in valuable biochemical products wherein.Film becomes contaminated after use.Contaminated film can be by soaking and using approximately 1 to 2% sodium hydroxide backwash or just rinsing and regeneration membrane is cleaned for further use in approximately 2% to 5% hydrogen peroxide.
In method according to the embodiment of the present invention, before glue mixes with fresh field latex clearly, clear by the concentrated glue of film system, and recentrifuge is latex enriched material.Use film to eliminate the needs solid to the acid cure for from the clear regenerated rubber of glue as the concentrated clear method of glue.Also contribute to improve the quality of the sewage producing by described method.Can use the contaminated film of combined type cleaning of chemical preparations, concentrated with regeneration membrane for below.The regeneration of rubber and by rubber be transformed into latex enriched material for rubber industry be increase be worth technique.
Provide the following examples further to illustrate and to describe specific embodiment of the present invention, and described embodiment should not be interpreted as limiting the invention to detailed process, the conditioned disjunction component in described embodiment, described by any way.
embodiment
embodiment 1: secondary concentration technology
The clear 60 object wire cloths that filter of glue with 5% drc, and with 0.65% ammonia and 0.1% ammonium laurate pre-treatment.Then, glue after treatment is clearly repeatedly through multitube shape membrane module.There is the aperture of approximately 0.05 μ, approximately passage internal diameter and the about total length of 1.0～1.2m of 3.0～4.0mm with multitube shape membrane module in this embodiment.The inlet pressure of membrane module is set as approximately 3 bar (3 × 10
5pa).Approximately 0.05% ammonium laurate joins Jiao Qingzhong with the interval of 30 minutes, clear to concentrate glue.
Continue this enrichment step, until obtain the approximately transparent whey of 60～70wt%, this transparent whey is removed as the first penetrant, leaves the first retentate that comprises approximately 11% dry glue.
Then, process the first retentate with other 0.1% ammonium laurate.Then, the first retentate after treatment is at approximately 3 bar (3 × 10
5pa) under inlet pressure, repeatedly pass the second multitube shape membrane module.Approximately 0.05% ammonium laurate joins in the first retentate with the interval of 30 minutes, so that further concentrated glue is clear.Carry out this further enrichment step, until obtain approximately the second transparent whey of 40～50wt%, this second transparent whey is removed as the second penetrant.After the second enrichment step, also obtain and comprise the second retentate that exceedes 20% dry glue.
Then,, before the second retentate mixes with the ratio of 1:9 part with fresh field latex, the TMTD/ZnO(with approximately 0.05% is with the ratio of 1:1) dispersion (30% concentration) processing the second retentate.Then with the centrifugal mixed retentate that comprises fresh field latex of the skimming screw element (skim screw) selected (be numbered 12 or the length of 12.5mm), to obtain latex enriched material.Then, latex enriched material after treatment further mixes with the ratio of 1:9 part with fresh latex enriched material, and ammonification is to the ammonia that exceedes 0.60%m/m, to obtain final latex enriched material.
The final latex enriched material obtaining by this technique has the quality that is comparable to common fresh latex enriched material.Due to regeneration with change the clear plastic of glue clear crepe rubber and compare, from the clear regenerated rubber of glue and rubber is transformed into latex enriched material has obtained better price, so this is to increase the technique being worth in rubber industry.
embodiment 2: single-stage concentration technology
In single-stage technique, 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 technique until obtain the approximately transparent whey of 80～90wt%, and beyond this transparent whey is removed as penetrant.The retentate obtaining in this single-stage technique comprises the dry glue that exceedes 20%.
After enrichment step, before retentate mixes with the ratio of 1:9 part with fresh field latex, the TMTD/ZnO(with approximately 0.05% is with the ratio of 1:1) dispersion (30% concentration) process the retentate obtaining from enrichment step.Then with the retentate of the centrifugal mixing that comprises fresh field latex of the skimming screw element selected (be numbered 12 or the length of 12.5mm), to obtain latex enriched material.Then, latex enriched material after treatment mixes with the ratio of 1:9 part with fresh latex enriched material further, and ammonification is to the ammonia that exceedes 0.60%m/m, to obtain final latex enriched material.The latex enriched material obtaining by single-stage technique has the quality of the latex enriched material that is comparable to common fresh latex enriched material and the acquisition of two-stage process from the above mentioned.
Foregoing is to be considered as the description of theme of the present invention for the inventor, and thinks based on above-mentioned disclosure, and other people can and will design packet contain alternative method of the present invention.
Claims (19)
1. by natural rubber latex being separated into the clear and concentrated natural rubber latex of rubber latex and glue, thereby from the method for the clear regenerated rubber of glue, described method comprises:
Described in pre-treatment, glue is clear;
Along with repeatedly making frequently adding of ammonium laurate pretreated described glue clearly through membrane module, to obtain retentate and penetrant;
Mix described retentate and fresh field latex;
The mixed retentate of centrifugal institute is to obtain latex enriched material;
Mix described latex enriched material and fresh latex enriched material; With
With ammonia treatment mixed latex enriched material to obtain final latex enriched material.
2. the method for claim 1, before being further included in the step of mixing described retentate and fresh field latex, processes described retentate by tetramethyl-thiuram disulfide (TMTD) and zinc oxide (ZnO) dispersion.
3. the method for claim 1, further comprises:
Before mixing the step of described retentate and fresh field latex, along with repeatedly making frequently adding of other ammonium laurate described retentate pass the second membrane module, to obtain the second retentate and the second penetrant.
4. method as claimed in claim 3, further comprises and processes described the second retentate by tetramethyl-thiuram disulfide (TMTD) and zinc oxide (ZnO) dispersion.
5. method as claimed in claim 3, further comprises:
Make described retentate by before described the second membrane module, with retentate described in ammonium laurate pre-treatment.
The method of claim 1, wherein with the interval of 10 to 30 minutes add described ammonium laurate clear to pretreated described glue in, until obtain the described penetrant of about 80wt% to 90wt%.
7. method as claimed in claim 3, wherein, with the interval of 10 to 30 minutes add described ammonium laurate clear to pretreated described glue in, until obtain the described penetrant of about 60wt% to 70wt%.
8. method as claimed in claim 7, wherein, adds other ammonium laurate in described retentate with the interval of 10 to 30 minutes, until obtain described the second penetrant of about 40wt% to 50wt%.
9. the method as described in claim 1 or 3, wherein, clear with glue described in ammonia and ammonium laurate pre-treatment.
10. method as claimed in claim 9, wherein, 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%.
11. the method for claim 1, wherein described membrane module be many tubular films.
12. methods as claimed in claim 11, wherein, described membrane module has 2.5 × 10
5to 4.5 × 10
5inlet pressure within the scope of Pa.
13. methods as claimed in claim 3, wherein, described the second membrane module is many tubular films.
14. methods as claimed in claim 13, wherein, described the second membrane module has 2.5 × 10
5to 4.5 × 10
5inlet pressure within the scope of Pa.
15. methods as claimed in claim 3, wherein, the ratio of the amount of described the second retentate and described fresh field latex is 1:9.
16. methods as claimed in claim 11, wherein, described multitube shape membrane module comprises diaphragm pump or centrifugal pump.
17. methods as claimed in claim 13, wherein, described the second multitube shape membrane module comprises diaphragm pump or centrifugal pump.
18. the method for claim 1, further comprise:
Clean described membrane module, described cleaning is carried out as follows:
By soak described membrane module in approximately 2% to 5% hydrogen peroxide; With
Sodium hydroxide backwash with approximately 1% to 2% or just rinsing described membrane module with the described membrane module of regenerating for further use.
19. methods as claimed in claim 3, further comprise:
Clean described membrane module, described cleaning is carried out as follows:
By soak described the second membrane module in approximately 2% to 5% hydrogen peroxide; With
Sodium hydroxide backwash with approximately 1% to 2% or just rinsing described the second membrane module with described the second membrane module of regenerating for further use.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| MYPI2011004876 | 2011-10-11 | ||
| MYPI2011004876A MY183918A (en) | 2011-10-11 | 2011-10-11 | A method of recovering rubber from skim natural rubber latex |
| 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 true CN103917564A (en) | 2014-07-09 |
| CN103917564B 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) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104177515A (en) * | 2014-08-20 | 2014-12-03 | 海南大学 | Environment-friendly processing method for layered complete utilization of natural latex resources |
| 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 |
Families Citing this family (3)
| 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 | Method for adjusting surface tension of polybutadiene super-large-particle-size latex |
| 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 |
Citations (7)
| 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 |
| 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 |
| WO2005007704A1 (en) * | 2003-07-21 | 2005-01-27 | B.C. Sekhar Sdn Bhd | Improvements to centrifugation of rubber latex |
| US20090062428A1 (en) * | 2007-08-30 | 2009-03-05 | Xuan Zhang | Elastomer composite and method for producing it |
-
2011
- 2011-10-11 MY MYPI2011004876A patent/MY183918A/en unknown
-
2012
- 2012-10-03 IN IN727KON2014 patent/IN2014KN00727A/en unknown
- 2012-10-03 CN CN201280050040.6A patent/CN103917564B/en not_active Expired - Fee Related
- 2012-10-03 WO PCT/MY2012/000259 patent/WO2013055202A1/en active Application Filing
Patent Citations (7)
| 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 |
| 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 |
| WO2005007704A1 (en) * | 2003-07-21 | 2005-01-27 | B.C. Sekhar Sdn Bhd | Improvements to centrifugation of rubber latex |
| US20090062428A1 (en) * | 2007-08-30 | 2009-03-05 | Xuan Zhang | Elastomer composite and method for producing it |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104177515A (en) * | 2014-08-20 | 2014-12-03 | 海南大学 | Environment-friendly processing method for layered complete utilization of natural latex resources |
| 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 |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| MY183918A (en) | 2021-03-17 |
| WO2013055202A1 (en) | 2013-04-18 |
| CN103917564B (en) | 2016-04-20 |
| IN2014KN00727A (en) | 2015-10-02 |
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