WO2012158015A9 - Method of quantitative measurement of mechanical stability time (mst) of latex suspensions and the apparatus for use in the method - Google Patents
Method of quantitative measurement of mechanical stability time (mst) of latex suspensions and the apparatus for use in the method Download PDFInfo
- Publication number
- WO2012158015A9 WO2012158015A9 PCT/MY2011/000050 MY2011000050W WO2012158015A9 WO 2012158015 A9 WO2012158015 A9 WO 2012158015A9 MY 2011000050 W MY2011000050 W MY 2011000050W WO 2012158015 A9 WO2012158015 A9 WO 2012158015A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- suspension
- mst
- agitator
- latex
- vessel
- Prior art date
Links
- 239000000725 suspension Substances 0.000 title claims abstract description 126
- 239000004816 latex Substances 0.000 title claims abstract description 75
- 229920000126 latex Polymers 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000005259 measurement Methods 0.000 title claims abstract description 22
- 238000013019 agitation Methods 0.000 claims abstract description 25
- 230000000704 physical effect Effects 0.000 claims abstract description 20
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 20
- 229910021529 ammonia Inorganic materials 0.000 claims description 10
- 229920006173 natural rubber latex Polymers 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 229920003051 synthetic elastomer Polymers 0.000 claims description 5
- 239000005061 synthetic rubber Substances 0.000 claims description 5
- 239000012141 concentrate Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 238000007865 diluting Methods 0.000 claims description 2
- 239000003085 diluting agent Substances 0.000 claims description 2
- 238000010792 warming Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 description 42
- 239000002245 particle Substances 0.000 description 6
- 230000016615 flocculation Effects 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000001687 destabilization Effects 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 239000000383 hazardous chemical Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000003755 preservative agent Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 238000003070 Statistical process control Methods 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009881 electrostatic interaction Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
- G01N11/14—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by using rotary bodies, e.g. vane
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/44—Resins; Plastics; Rubber; Leather
- G01N33/445—Rubber
Definitions
- This invention relates to a method of measuring physical properties of latex suspensions.
- this invention is related to a method of quantitative measurement of the mechanical stability time (MST) of latex suspensions and the apparatus for use in the method.
- MST mechanical stability time
- Mechanical stability is defined as the ability of a colloidal suspension to withstand the colloidal destabilization effects of mechanical forces such as shearing and agitation.
- the mechanical stability of colloidal lattices is a property of great industrial importance.
- latex For latex, its mechanical stability has implications for its pumping, transportation and processing in that the latex must have sufficient mechanical stability to withstand shearing forces that arise during handling and processing without suffering colloidal destabilization.
- MST of colloidal suspensions cannot be assessed quantitatively. Only qualitative MST tests are available at the moment and there is an element of subjectivity in these prior tests.
- the standard tests for determination of MST of natural rubber latex are those prescribed in tests ISO 35 and ASTM D-1076. Both standards prescribe determination of MST by manual qualitative methods by using the palm-of-the-hand method.
- the ISO 35 standard provides for an alternative qualitative test by using the dispersibility-in-water method.
- a clean glass rod is dipped into a test bottle in order to remove a drop of latex.
- Each drop of latex is gently spread on the palm of the hand. This is repeated at intervals of 15 seconds.
- the MST or end point of the sample is determined by first appearance of flocculum.
- the MST for the latex sample is expressed as the number of seconds that lapsed from the start of the test to the end point.
- a pointed rod is used to pick up a small drop of latex in the test bottle.
- the drop of latex is then immediately dispersed in a water-containing petri dish.
- the latex droplet will either disperse or flocculate. If the drop of latex flocculates, the latex has reached its coagulated condition.
- the MST is expressed as the time lapsed from the start of the test to the first appearance of floccules.
- both the standard tests require sampling of the latex at 15-second intervals until MST end point is reached. Besides being laborious and time consuming, these tests results in exposure of the laboratory technician to hazardous chemical fumes of the preservatives typically used in latex suspensions e.g. ammonia in natural rubber latex.
- MST is a physical property of great industrial and commercial importance in the processing and use of latex suspensions. Hence, there is a need to efficiently and accurately measure MST of such suspensions quantitatively.
- This invention thus aims to alleviate some or all of the problems of the prior art.
- MST mechanical stability time
- the agitation of step (ii) may be conducted at a speed of between about 12,000 rpm to about 16,000 rpm.
- the agitation of step (ii) may preferably be conducted at a speed of about 14,000 rpm.
- step (ii) may further comprise the control means maintaining the agitator at an optimal agitation speed to achieve change in the physical properties of the suspension.
- calculation of the MST of the suspension in step (iv) may be by normal distribution analysis at 95% confidence interval.
- calculation of the MST of the suspension in step (iv) may be by normal distribution analysis at 68% confidence interval.
- the latex suspension may comprise natural rubber latex.
- the method of this invention may further comprise preparing the latex suspension by diluting a latex concentrate with a suitable diluent such as ammonia, prior to step (i).
- a suitable diluent such as ammonia
- the diluted latex suspension prepared prior to step (i) may have a total solid content of about 55%.
- the method may further comprise warming the diluted latex suspension to a temperature of about 36 to 37°C, prior to step (i).
- the latex suspension may comprise synthetic rubber.
- an apparatus for automatic quantitative measurement of mechanical stability time (MST) of a latex suspension is provided.
- the apparatus comprises a vessel for containing the suspension; an agitator, the agitator provided to be submerged in the suspension in use and capable of agitating the suspension at sufficient speed so as to cause changes in the physical properties of the suspension; a rotatable base for holding the vessel, the vessel being removably coupled to said base; and a connector operatively connecting the rotatable base to a sensor.
- the sensor is capable of detecting and transmitting the load force values resulting from agitation of the suspension to a control means.
- the control means is capable of calculating the MST of the suspension.
- agitation of the suspension by the agitator causes displacement of the vessel, displacement of said vessel in turn causes rotation of said base to which said vessel is coupled, rotation of the base is detected by the sensor through the connector and transmitted to the control means which automatically calculates the MST of the suspension by normal distribution analysis of the collected load force value data.
- the vessel may comprise a flat-bottom container having a smooth inner surface.
- the vessel may be substantially cylindrical.
- the vessel may be provided with coupling lugs and the base may be provided with corresponding openings to receive the lugs so as to enable the vessel to be removably coupled with the base, in use.
- the agitator may be capable of agitating the suspension at a speed of between about 12,000 rpm to about 16,000 rpm.
- the agitator may preferably be capable of agitating the suspension at a speed of about 14,000 rpm.
- the agitator may comprise a shaft coupled to a power source at the proximal end and having an agitator disk at the distal end.
- the agitator shaft may have a tapering configuration from its proximal to its distal ends.
- the apparatus may further comprise a holder attached at the bottom of the base by way of a shaft, the holder and base arranged concentrically about the shaft, and the holder housing a bearing arrangement so as to enable rotational movement of the base, in use.
- the connector may be removably attached to the base shaft.
- the connector may comprise an attachment portion for removable attachment to the base shaft, and an abutment portion engaged with the attachment portion and contactable with the sensor, in use.
- the connector may be provided in one molded piece and the abutment portion may have a serpentine configuration.
- the sensor may comprise a force sensor.
- the sensor may comprise a torque sensor.
- control means may comprise a hardware component and a software component.
- the control means may be operatively connected to the agitator and, depending on a preset speed setting, is capable of maintaining the agitator at an optimal agitation speed, in use.
- the latex suspension may comprise natural rubber latex.
- the latex suspension may comprise synthetic rubber.
- the method and apparatus of this invention provides for an automated quantitative measurement of MST of latex suspensions that minimizes the need for manual input during the test i.e. occurrence of human error is correspondingly minimized and the results obtained is more accurate, consistent and reproducible.
- the method and apparatus of this invention also reduces the duration of the test and does away with the need to obtain samples of the latex suspensions at predetermined time intervals during the test (e.g. sampling at 15-second intervals for qualitative latex MST testing). This aids in preventing exposure of the laboratory technician to hazardous chemical fumes present in preservatives commonly used for such suspensions. Additionally, the apparatus of this invention also enables automatic maintenance of the optimal agitator speed throughout the duration of the test. This further aids in enhancing the accuracy of the test results.
- Figure 1 is a perspective view of the apparatus for automatic quantitative measurement of mechanical stability time ( ST) of a latex suspension according to an embodiment of this invention.
- Figure 2 is a front view of the base, holder and connector of the apparatus of Figure 1.
- Figure 3 is a front view of an alternative configuration of the base, holder and connector of the apparatus of this invention.
- Figure 4 are perspective views of the configuration of Figure 2.
- Figure 5 are perspective views of the configuration of Figure 3.
- Figure 6 is a plan view of the base, holder and connector of Figure 2 with the abutment portion of the connector in contact with the sensor.
- Figure 7 is a diagrammatic representation of the transmittal of load force from the rotatable base to the sensor (control means) via the connector for the configuration of Figure 2.
- Figure 8 is a graph (force-against-time) showing the normal distribution analysis done at 95 % confidence interval.
- Figure 9 is a control graph for normal distribution analysis calculation of the MST of a latex suspension.
- a method for the quantitative measurement of mechanical stability time (MST) of a latex suspension and the apparatus for use in the method are provided as follows.
- a method for the quantitative measurement of mechanical stability time (MST) of a latex suspension generally involves four main steps, namely, providing a load force measuring apparatus, agitating the suspension, measuring and monitoring the changes in physical properties of the suspension, and calculating the MST of the suspension.
- a load force measuring apparatus for measurement of MST of a latex suspension according to a method of this invention is provided.
- the apparatus enables automatic quantitative determination of MST and mainly comprises an agitator 10, a sensor 60 and a control means. Further details of the load force measuring apparatus are provided in the following portions of this description.
- Preparation of latex suspension test sample Preparation of a test sample of the latex suspension is dependent on the particular type of suspension being tested. Generally, methods of sample preparation for qualitative testing of such suspensions are prescribed in the ISO as well as ASTM standards. For example, as mentioned earlier, the standard tests for determination of MST of natural rubber latex are those prescribed in tests ISO 35 and ASTM D-1076. Both these standards prescribe that the latex (concentrate) is firstly diluted with ammonia to about 55% total solid content and subsequently warmed to a temperature of between about 36°C to 37°C. The diluted and warmed latex sample is then preferably strained through a stainless steel sieve, prior to testing.
- the agitator 10 is provided to be submerged in the suspension in use, and is capable of agitating the suspension at sufficient speed so as to cause changes in the physical properties of the suspension e.g. flocculation. It is preferable that the agitator 10 is maintained at optimal agitation speed for achieving changes in the physical properties of the suspension.
- the optimal agitation speed is very much dependent on the suspension tested since interaction between particles differs from colloid to colloid e.g. van der Walls force, entropic force, steric force, electrostatic interaction etc.
- the latex suspension is agitated at a speed of between about 12,000 rpm to about 16,000 rpm. It is particularly preferred that the latex suspension is agitated at a speed of 14,000 rpm.
- the agitator 10 will impart translational kinetic energy to the latex particles. This leads to physical deformation of the latex lattices ultimately resulting in flocculation. The load force within the agitated suspension increases as the particles flocculate.
- the method of this invention advantageously allows for these changes in load force value (translational kinetic energy imparted to the latex particles) to be analyzed and quantified.
- a sensor 60 is provided for detecting these changing (increasing) load force values and transmitting the same to a control means.
- the sensor 60 detects the load force values and converts the same into electrical signals for transmittance to the control means.
- Any type of load sensor (load cell) may be used in the method of this invention e.g. a force sensor or a torque sensor. It is preferred that a force sensor is used. Calculating the MST of the suspension
- a control means for storing the load force value data collected by the sensor 60 and calculating the MST of the suspension is provided.
- the control means converts the electrical signal received from the sensor 60 into digital data that is stored.
- control means automatically analyzes the stored load force value data and calculates MST of the latex suspension by way of normal distribution analysis (graph plot of force (N) against time (s)).
- normal distribution analysis graph plot of force (N) against time (s)
- ⁇ standard deviations
- MST end point
- analysis is done at 68% confidence interval to obtain latex MST for research purposes since additional technical information about the physical properties of the latex sample may be obtained e.g. earlier coagulation possible.
- Apparatus for quantitative measurement of MST Figures 1 to 7 show an apparatus of this invention for use in the method of quantitative measurement of MST according to this invention.
- the apparatus of this invention allows for automatic quantitative measurement of MST of a latex suspension and mainly comprises a vessel 20, an agitator 10, a rotatable base 30, a connector 50, a sensor 60 and a control means.
- the test vessel 20 for containing the latex suspension to be tested is preferably a flat-bottom container having a smooth inner surface. Most preferably, the vessel 20 is substantially cylindrical.
- the vessel 20 is cylindrical with a diameter of about 57.8 mm ( ⁇ 1 mm) and a height of 127 mm.
- the thickness of the vessel wall is preferably about 2.3 mm.
- the vessel 20 has a plurality of coupling lugs 21 equally distributed about the outer circumference of its bottom. Most preferably, a pair of coupling lugs 21 is provided. These lugs 21 enable the vessel to be removably coupled with the rotatable base 30 of the apparatus in use and aids in the transmittal of load force (arising from agitation of the suspension) to the sensor 60 and control means (through the rotatable base 30 and connector 50).
- An agitator 10 is provided to be submerged in the suspension in use and comprises a shaft coupled to a power source (not shown) at its proximal end and provided with an agitator disk (not shown) at its distal end.
- the agitator shaft is preferably of a tapering configuration toward its distal end (enhances the structural strength of the agitator 10). Most preferably, the shaft is of approximately 6.3 mm in diameter at its distal end.
- the agitator disk comprises a polished stainless steel disk having a centrally disposed threaded stud for attachment to the proximal end of the agitator shaft. Most preferably, the disk is 20.83 ⁇ 0.03 mm in diameter and 1.57 ⁇ 0.05 mm in thickness.
- the agitator 10 must be capable of agitating the suspension at sufficient speed so as to cause changes in the physical properties of the suspension.
- a high- speed agitator capable of maintaining an agitation speed of between about 12,000 to 16,000 rpm for the duration of the test is used.
- the configuration comprising the rotatable base 30, holder 40 and connector 50, is provided to be vertically movable in use so that it can be conveniently lowered and raised to the desired height in relation to the position of the agitator 10 i.e. to ensure that the agitator disk is submerged to the desired depth within the latex suspension for the duration of the test.
- the rotatable base 30 comprises a holding portion 32 and a shaft 33 disposed perpendicular to the holding portion 32.
- the holding portion 32 of the base 30 may be in any suitable shape to receive the test vessel 20.
- the base holding portion 32 is provided with a plurality of circumferential openings 31 about its walls. These openings 31 correspond to the coupling lugs 21 of the test vessel 20 and enable the vessel 20 to be removably coupled with the base 30, in use.
- the holder 40 comprises a support portion 41 attachable at the bottom of the holding portion 32 of the rotatable base 30 and a housing portion 42 that encases a bearing arrangement 43 which enables rotational movement of the base 30, in use.
- the holder 40 and the base 30 are arranged concentrically about the shaft 33 of the base 30 i.e. the holder bearing arrangement 43 encases the base shaft 33.
- the bearing arrangement 43 aids in ensuring the concentric alignment of the holder 40 and the base 30.
- the bearings 43 also enables the vessel 20 to be in concentric alignment with the holder 40 and the base 30. This aids in more efficient translation of load force resulting from agitation of the suspension to the sensor 60.
- FIG. 2 to 7 An exemplary configuration of the holder 40 is shown in Figures 2 to 7. It is envisioned that the holder 40 may have any configuration suitable to perform its function as above described.
- the connector 50 is attached to the shaft 32 of the base 30 (holder 40).
- the connector 50 is removably attachable adjacent the proximal end of the shaft 32.
- the connector 50 is disposed such that it is contactable with the sensor 60 when the apparatus is in use. It can be said that the connector 50 provides the physical connection between the rotational movement of the base 30 (via shaft 32) and the sensor 60, in use i.e. the connector 50 enables the resulting load force from agitation of the suspension (within the vessel 20 coupled to the base 30) to be transmitted to the sensor 60.
- the connector 50 comprises an attachment portion 51 for removable attachment to the base shaft 32, and an abutment portion 52 engaged with the attachment portion 51.
- the abutment portion 52 is contactable with the sensor 60, in use.
- the connector 50 may be provided in one molded piece, as shown in Figures 2, 4, 6 and 7.
- the abutment portion 52 of the connector 50 shown in these Figures has a serpentine configuration.
- the attachment portion 51 and the abutment portion 52 of the connector 50 may be separately provided, as seen in Figures 3 and 5.
- the attachment portion 51 has a ring-like shape with a threaded opening disposed along its horizontal axis and the abutment portion 52 comprises a threaded stub that is received through the threaded opening of the attachment ring. An end of the threaded stub is contactable with the sensor 60, in use.
- the connector 50 may have any configuration suitable to perform its function.
- the sensor 60 is provided to detect the changing load force values and transmit the same to the control means.
- the sensor 60 detects the load force values resulting from agitation of the suspension (conveyed via the base 30, holder 40, connector 50) and converts the same into electrical signals prior to transmitting it to the control means.
- load sensor load cell
- a force sensor or a torque sensor.
- a force sensor is preferred over a torque sensor as it has been observed to have greater sensitivity i.e. more accurate results.
- a force sensor capable having a maximum load force value of 10N is used.
- a torque sensor having a maximum load force value of lONm may be used.
- the control means comprises a hardware component (data acquisition hardware (DAQ)) and a software component.
- DAQ hardware may be in the form of any DAQ hardware capable of functioning as an Analog to Digital Converter.
- the software component may be any software suitable to be used for the purposes of MST testing and is preferably provided with security features to avoid plagiarism. This security feature functions in a similar manner to typical software protection dongles.
- the DAS converts the electrical signal received from the sensor 60 to a digital signal.
- the software picks up the digital signal via serial communication between the computer and the DAQ and translates the digital signal to a readable unit.
- the data is displayed in real time and also stored for further analysis.
- the software Upon conclusion of the test (preset duration of time), the software automatically analyzes the data by normal distribution analysis and determines the MST (end point) of the latex suspension, as described above.
- the DAS is operatively connected to the agitator 10.
- the DAS is capable of monitoring the speed of the agitator 10 and maintaining the agitator at an optimal agitation speed in use e.g. for a latex suspension sample, the agitator 10 can be maintained at 14,000 rpm throughout the duration of the test.
- agitation of the suspension in the test vessel 20 causes physical deformation of the latex lattices (translational kinetic energy imparted to the latex particles by agitator 10) and ultimately, flocculation.
- the load force within the agitated suspension increases as the particles flocculate.
- Agitation of the suspension also results in displacement of the vessel 20.
- displacement of the vessel 20 causes rotation of the base 30 (holder 40). Rotational movement of the base 30 (holder 40) is transmitted via the connector 50 to the sensor 60 which emits an electrical signal read by the Data Acquisition System (DAS).
- DAS Data Acquisition System
- a test to compare the MST values obtained by using the method of this invention and the manual palm-of-the-hand method was conducted by Lembaga Getah Malaysia in 2011. Two latex samples were tested, firstly a high ammonia (HA) sample, and secondly, a low ammonia (LATZ) sample.
- HA high ammonia
- LATZ low ammonia
- Latex concentrate Approximately 80. Og of latex concentrate was diluted with ammonia solution to about 55% total solids and subsequently warmed to a temperature of about 36°C to 37°C. The diluted and warmed latex was immediately strained through a stainless steel sieve into the test vessel.
- the MST end point can be obtained via norma! distribution analysis using Figure 9 (control graph) as described on the following page.
- Figure 9 is a control graph used for analyzing the change in the physical properties of the latex samples over time.
- the central line of the graph represents the average
- the upper line represents the upper control limit (UCL)
- the lower line represents the lower control limit (LCL).
- the MST (end point) obtained by the palm-of-the-hand method is 1209s.
- the test process is repeated five times to obtain correlation variance.
- Table 1 shows the results of MST determination of a sample of high ammonia latex (preserved with 0.7% ammonia).
- Table 2 shows the results of MST determination of a sample of low ammonia (LATZ) latex (preserved with 0.2% ammonia).
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Abstract
Description
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1318212.6A GB2503619B (en) | 2011-05-19 | 2011-05-19 | Method of quantitative measurement of mechanical stability time (MST) of latex suspensions and the apparatus for use in the method |
CN201180005063.0A CN102893148B (en) | 2011-05-19 | 2011-05-19 | For method and the equipment that uses in the process of quantitative measurment latex suspended matter mechanical stability time (MST) |
DE112011105263.4T DE112011105263T5 (en) | 2011-05-19 | 2011-05-19 | Method of quantitative measurement of mechanical stability time (MST) of latex suspensions and apparatus for use in the method |
PCT/MY2011/000050 WO2012158015A1 (en) | 2011-05-19 | 2011-05-19 | Method of quantitative measurement of mechanical stability time (mst) of latex suspensions and the apparatus for use in the method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/MY2011/000050 WO2012158015A1 (en) | 2011-05-19 | 2011-05-19 | Method of quantitative measurement of mechanical stability time (mst) of latex suspensions and the apparatus for use in the method |
Publications (2)
Publication Number | Publication Date |
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WO2012158015A1 WO2012158015A1 (en) | 2012-11-22 |
WO2012158015A9 true WO2012158015A9 (en) | 2014-01-03 |
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PCT/MY2011/000050 WO2012158015A1 (en) | 2011-05-19 | 2011-05-19 | Method of quantitative measurement of mechanical stability time (mst) of latex suspensions and the apparatus for use in the method |
Country Status (4)
Country | Link |
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CN (1) | CN102893148B (en) |
DE (1) | DE112011105263T5 (en) |
GB (1) | GB2503619B (en) |
WO (1) | WO2012158015A1 (en) |
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CN113063933B (en) * | 2021-03-19 | 2023-06-13 | 大自然科技股份有限公司 | Latex chemical stability testing method and application thereof |
CN113189314B (en) * | 2021-04-06 | 2023-05-26 | 石河子大学 | Optimal harvesting method for rubber of rubber tree |
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JP3248978B2 (en) * | 1993-05-13 | 2002-01-21 | 花王株式会社 | Stabilizer for deproteinized natural rubber latex and method for producing stabilized deproteinized natural rubber latex using the same |
CN1075818C (en) * | 1997-08-14 | 2001-12-05 | 中国石油化工集团公司 | High stability carboxy styrene butadiene rubber latex |
JP2004204147A (en) * | 2002-12-26 | 2004-07-22 | Nippon A & L Kk | Copolymer latex for adhesive between rubber and fiber |
CN101437464A (en) * | 2006-05-11 | 2009-05-20 | 尤莱克斯公司 | Non-synthesis low protein rubber latex product and test method thereof |
-
2011
- 2011-05-19 CN CN201180005063.0A patent/CN102893148B/en active Active
- 2011-05-19 GB GB1318212.6A patent/GB2503619B/en active Active
- 2011-05-19 DE DE112011105263.4T patent/DE112011105263T5/en not_active Withdrawn
- 2011-05-19 WO PCT/MY2011/000050 patent/WO2012158015A1/en active Application Filing
Also Published As
Publication number | Publication date |
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DE112011105263T5 (en) | 2014-04-30 |
CN102893148B (en) | 2015-11-25 |
CN102893148A (en) | 2013-01-23 |
GB2503619B (en) | 2017-02-22 |
GB201318212D0 (en) | 2013-11-27 |
WO2012158015A1 (en) | 2012-11-22 |
GB2503619A (en) | 2014-01-01 |
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