Emulsion matrix colloid quality detection method and application thereof, and detection system

Abstract

The invention relates to the technical field of detection, in particular to a detection method for latex matrix colloid quality, application of the detection method and a detection system. The detection method comprises the following steps: placing an emulsion matrix sample to be detected in a container containing an aqueous medium; maintaining for a period of time under a preset constant temperature condition, so that the water-soluble electrolyte in the emulsion matrix is separated out into the aqueous medium; separating to obtain a test solution containing precipitated electrolyte; the conductivity of the test liquid is measured, the quality of the emulsion matrix is evaluated according to the conductivity value, and the conductivity value is in negative correlation with the quality of the emulsion matrix. The invention further provides application of the method. The invention further provides a detection device system which comprises a constant-temperature processing unit used for containing a sample and providing a constant-temperature environment; the conductivity measuring unit is used for measuring the conductivity value of the test liquid, and the constant-temperature processing unit comprises at least one first container used for containing an aqueous medium and a second container used for containing an emulsion matrix sample.

Description

Technical Field

[0001] This invention relates to the field of detection technology, specifically to a method for detecting the quality of latex matrix colloids and its application, and a detection system. Background Technology

[0002] Latex matrices, as an important type of colloidal system, are widely used in chemical, materials, pharmaceutical, and daily chemical industries. At their core, they are stable systems formed by the uniform dispersion of a dispersed phase (such as polymer particles or oils) within a continuous phase (mostly aqueous). In practical applications, the stability of the latex matrix is ​​a key indicator determining its performance, shelf life, and final performance. For specific latex systems containing water-soluble inorganic salts (such as ammonium nitrate) (e.g., latexes used in certain industrial explosives or specialty materials), the retention and precipitation behavior of salts are crucial parameters for evaluating their colloidal quality and structural integrity. Insufficient latex stability leads to the migration and precipitation of internal salts, which not only damages the latex's microstructure, causing demulsification and stratification, but also significantly affects its physicochemical properties and the feasibility of subsequent processes.

[0003] Therefore, developing rapid, accurate, and quantitative methods to characterize the behavior of water-soluble components in latex is of great significance for product quality control, formulation optimization, and production process evaluation.

[0004] Traditional methods for assessing latex stability often focus on macroscopic observations (such as standing time and centrifugal stability) or rheological tests. While these methods can reflect overall stability, they are often not sensitive enough or lack direct quantitative evidence for early, trace component migrations, especially the precipitation of electrolyte ions. Summary of the Invention

[0005] This invention aims to address the problems of insensitivity, long processing times, or inability to quantify latex matrix stability testing methods in existing technologies. This invention provides a method, system, and application for latex matrix quality testing based on conductivity measurement. This method accelerates electrolyte precipitation under simulated thermal conditions and quantitatively measures the amount of precipitation, thereby rapidly, sensitively, and quantitatively evaluating the colloidal stability and quality of the latex matrix.

[0006] First, the present invention provides a method for detecting the quality of latex matrix colloids, comprising the following steps: Place the latex matrix sample to be tested in a container filled with an aqueous medium; The temperature is maintained at a preset constant temperature for a period of time, allowing the water-soluble electrolytes in the latex matrix to precipitate into the aqueous medium. Separate to obtain a test solution containing the precipitated electrolyte; The conductivity of the test solution is measured, and the quality of the latex matrix is ​​evaluated based on the conductivity value, wherein the conductivity value is negatively correlated with the quality of the latex matrix.

[0007] Furthermore, the latex matrix is ​​an emulsion explosive latex matrix containing ammonium nitrate.

[0008] Furthermore, the preset constant temperature condition is 50°C for 30 minutes.

[0009] Furthermore, the step of measuring conductivity includes: reading the conductivity value when the temperature of the test liquid is compensated to 30°C.

[0010] Furthermore, prior to the isothermal step, a sample preparation step is included: the latex matrix is ​​placed in a weighing vessel, and the sample surface is made flat to prepare at least two parallel samples.

[0011] Furthermore, in the sample preparation step, parallel samples have the same weight, flat weighing bottles are the same size, the distance between the sample liquid surface and the mouth of the vessel is controlled, and visible bubbles and impurities are eliminated.

[0012] Furthermore, the quality of the latex matrix is ​​evaluated based on the conductivity value. Specifically, the lower the conductivity reading, the less electrolyte is released from the latex matrix, and the better the colloid quality.

[0013] Secondly, a detection device system based on the above detection method is also provided, including: Thermostatic processing unit is used to contain samples and provide a constant temperature environment; The conductivity measurement unit is used to measure the conductivity value of the test liquid. The constant temperature processing unit includes at least one first container for holding the aqueous medium and a second container for placing the latex matrix sample.

[0014] Furthermore, the second container is a flat weighing bottle, the first container is a beaker, and the flat weighing bottle is placed in an aqueous medium inside the beaker.

[0015] Thirdly, the application of the above-mentioned detection methods in evaluating the stability of latex matrix is ​​also provided, specifically: in the production process of emulsion explosives, for screening latex matrix formulations, optimizing process parameters, or inspecting product quality.

[0016] Compared with the prior art, the advantages of the present invention are as follows: 1. The present invention provides a method for detecting the quality of latex matrix colloids, which uses conductivity to detect the quality of latex matrix colloids and water-soluble ions (such as NH4+ dissociated from ammonium nitrate) in the latex matrix. + and NO3 -When colloids migrate to the external aqueous phase due to instability, the conductivity of the aqueous phase increases. The greater the amount of ions precipitated, the higher the conductivity of the aqueous phase. By contacting a latex sample with a fixed amount of distilled water at a constant temperature for a period of time, allowing the precipitated ions to fully dissolve in the water, and then accurately measuring the conductivity of the aqueous solution, the ability of the latex to retain its internal components under heating conditions can be indirectly and quantitatively reflected.

[0017] The detection method of this invention transforms the complex problem of colloidal stability into a comparison of accurately measurable conductivity values ​​by strictly controlling the sample amount, contact conditions and measurement parameters.

[0018] This method is relatively simple to operate, has good repeatability, and can sensitively capture the subtle differences in the degree of electrolyte precipitation inside the latex matrix under thermal stress. Thus, it provides an objective and quantitative indicator for judging the quality of the colloid: the lower the conductivity reading, the less electrolytes such as ammonium nitrate are precipitated, the more stable the latex matrix structure, and the better the quality; conversely, the higher the conductivity reading, the more severe the precipitation, the poorer the colloid stability, and the worse the quality.

[0019] The detection method of the present invention can provide an auxiliary detection means for relevant industries to evaluate the thermal stability and internal structural compactness of specific latex systems, and has practical value for guiding production and ensuring product quality.

[0020] 2. The detection device system provided by the present invention has a simple structure but high practicality.

[0021] 3. The detection method provided by this invention has high practical value, wide application range, and strong advantages in the development or quality control of emulsion explosive products. Attached Figure Description Specific Implementation In an embodiment of the present invention, firstly, a method for detecting the quality of latex matrix colloids is provided, comprising the following steps: Place the latex matrix sample to be tested in a container filled with an aqueous medium; The temperature is maintained at a preset constant temperature for a period of time, allowing the water-soluble electrolytes in the latex matrix to precipitate into the aqueous medium. Separate to obtain a test solution containing the precipitated electrolyte; The conductivity of the test solution is measured, and the quality of the latex matrix is ​​evaluated based on the conductivity value, wherein the conductivity value is negatively correlated with the quality of the latex matrix.

[0023] In some implementations, the detection method specifically includes the following steps: S1. Precipitation treatment: The latex matrix sample to be tested is contacted with a certain amount of aqueous medium and maintained at a set constant temperature for a period of time to allow the water-soluble electrolytes in the latex matrix to precipitate into the aqueous medium.

[0024] S2. Test solution preparation: Separate the aqueous medium after precipitation treatment to obtain a test solution containing the precipitated electrolyte.

[0025] S3. Conductivity Measurement and Quality Judgment: Measure the conductivity of the test solution and evaluate the quality of the latex matrix based on the conductivity value; wherein, the higher the conductivity value, the greater the amount of electrolyte precipitation and the worse the quality of the latex matrix; the lower the conductivity value, the less the amount of electrolyte precipitation and the better the quality of the latex matrix.

[0026] The method for detecting the quality of latex matrix colloids provided by this invention can indirectly and quantitatively reflect the ability of latex to retain its internal components under heating conditions.

[0027] Rapid and Sensitive: Accelerated precipitation under isothermal conditions allows for rapid detection results and sensitive capture of early, subtle differences in latex matrix stability. Quantitative and Objective: Using conductivity as a quantitative indicator, results are accurate and repeatable, avoiding the subjectivity of traditional visual methods and facilitating direct comparisons between different batches and formulations. Simple to Operate: Requires common equipment and standardized procedures, making it easy to implement in production sites or laboratories. Strong Correlation: This method directly measures the precipitation of electrolyte ions, which is directly related to the integrity and microstructural stability of the latex matrix oil phase interface film, effectively predicting the macroscopic storage performance of the product.

[0028] In some embodiments of the present invention, the latex matrix is ​​an emulsion explosive latex matrix containing ammonium nitrate.

[0029] In some embodiments of the present invention, the preset constant temperature condition is 50°C for 30 minutes. This condition can effectively accelerate ion migration without causing instantaneous and violent demulsification of the latex matrix.

[0030] In some embodiments of the present invention, the step of measuring conductivity includes: reading the conductivity value when the test liquid temperature is compensated to 30°C. Reading the value is performed when the test liquid temperature is uniformly compensated or kept constant at 30°C to eliminate the influence of temperature on conductivity measurement.

[0031] In some embodiments of the present invention, before the isothermal step, a sample preparation step is further included: the latex matrix is ​​placed in a weighing vessel and the sample surface is made flat to prepare at least two parallel samples.

[0032] In some embodiments of the present invention, in the sample preparation step, parallel samples have the same weight, flat weighing bottles are the same size, the distance between the sample liquid surface and the mouth of the vessel is controlled, and visible bubbles and impurities are eliminated.

[0033] In some embodiments of the present invention, the quality of the latex matrix is ​​evaluated based on the conductivity value, specifically by the following method: the lower the conductivity reading, the less electrolyte is released from the latex matrix, and the better the quality of the colloid.

[0034] Before step S1, a sample preparation step is also included: accurately weigh equal masses of the latex matrix to be tested, place them in a clean and dry weighing vessel (such as a flat weighing bottle), level the surface, and prepare at least two parallel samples. More preferably, control the distance between the upper surface of the sample and the mouth of the vessel (basically horizontal), and ensure that there are no visible air bubbles or impurities in the sample to ensure the consistency of the test conditions.

[0035] Secondly, a detection device system based on the above detection method is also provided, including: Thermostatic processing unit is used to contain samples and provide a constant temperature environment; The conductivity measurement unit is used to measure the conductivity value of the test liquid. The constant temperature processing unit includes at least one first container for holding the aqueous medium and a second container for placing the latex matrix sample.

[0036] In some embodiments of the present invention, the second container is a flat weighing bottle, the first container is a beaker, and the flat weighing bottle is placed in an aqueous medium inside the beaker.

[0037] In some embodiments of the present invention, the conductivity measuring unit, used to accurately measure the conductivity value of the test liquid, typically includes a conductivity meter, a conductivity electrode, and a temperature electrode.

[0038] Thirdly, the application of the above-mentioned detection methods in evaluating the stability of latex matrix is ​​also provided, specifically: in the production process of emulsion explosives, for screening latex matrix formulations, optimizing process parameters, or inspecting product quality.

[0039] Example 1 This embodiment uses the detection of ammonium nitrate latex matrix for emulsion explosives as an example to illustrate the implementation process of this method in detail.

[0040] Sample Preparation: Accurately weigh two latex matrix samples, each weighing 33.0 ± 1.0 g, using a balance. Place the samples into two clean, dried analytical grade flat glass weighing bottles (outer diameter 40 mm, inner diameter 38.4 mm, height 25 mm). Carefully smooth the sample surface with a spatula, ensuring the sample surface is roughly level with the bottle opening and free of air bubbles. These are parallel samples 1# and 2#.

[0041] Isothermal precipitation: Take two clean 1000mL beakers and add 500g (approximately 500mL can be measured using a graduated cylinder) of distilled water to each. Slowly place the weighing bottle containing the sample into the beakers, immersing it in the distilled water. Place the two beakers side by side in a constant-temperature water bath, adjust the water bath temperature to 50.0℃±0.5℃, and start timing. Maintain this temperature for 30 minutes. During this process, electrolytes such as ammonium nitrate precipitated from the latex matrix will dissolve in the surrounding distilled water.

[0042] Test solution transfer: After the isothermal period, wear heat-resistant gloves and remove the beaker. Carefully pour the aqueous solution from the beaker into two clean 500mL beakers, discarding the weighing bottle and any remaining latex matrix. This yields test solution 1 and test solution 2.

[0043] Conductivity Measurement: Turn on the calibrated conductivity meter, wash the conductivity and temperature electrodes with deionized water and dry them with filter paper. Immerse the electrodes in the test solution 1, gently agitate, and after the reading stabilizes, record the conductivity value K1 when the instrument automatically compensates for temperature at 30.0℃. Measure the conductivity value K2 in the test solution 2 using the same method.

[0044] Results Analysis and Judgment: Calculate the average conductivity readings, Ka, of the two parallel samples (the standard deviation of the two sets of data should be less than 10 μS / cm). Compare Ka with the quality standard established in advance through numerous experiments.

[0045] For example: Ka < 30 μS / cm is excellent, 30-60 μS / cm is good, and > 60 μS / cm is unqualified, or the Ka values ​​of different batches of samples can be directly compared. The smaller the value, the less electrolyte is precipitated under the accelerated conditions, the more compact the colloidal structure of the latex matrix, the better the thermal stability, and the better the quality.

[0046] Example 2 The following steps were used to determine the quality of latex in a certain test: Weigh a certain amount of latex matrix and place it in a clean and dry weighing bottle. Scrape the surface of the latex matrix smooth and make two parallel samples, namely 1 and 2, with the two parallel samples having the same weight.

[0047] The latex matrix is ​​basically level with the mouth of the weighing bottle, and there are no air bubbles or impurities.

[0048] Place the weighing bottle containing the latex matrix into a clean 1000 ml beaker containing 500 g of distilled water; Place the two beakers in a constant temperature water bath at 50℃ for 30 minutes. Once the constant temperature is achieved, pour the solution into another clean 500ml beaker for later use.

[0049] Turn on the conductivity meter, place the conductivity electrode and temperature electrode into the two sets of solutions respectively for measurement, and record the conductivity reading at a temperature of 30℃.

[0050] The quality of the colloid is determined by its electrical conductivity value. A higher conductivity value indicates more ammonium nitrate precipitation, resulting in relatively poorer colloid quality. Conversely, a lower conductivity value indicates less ammonium nitrate precipitation, resulting in relatively better colloid quality. This completes the latex quality testing.

[0051] Example 3 Based on Example 1, the detection method was applied in the actual formulation screening.

[0052] A company, while developing a new emulsion explosive formulation, prepared two latex matrices, A and B, with different amounts of emulsifier. The two matrices were tested using the method described in Example 1. The results showed that the average conductivity of sample A was 17.87 μS / cm, while the average conductivity of sample B was 22.75 μS / cm. This quantitatively indicates that formulation A has a better emulsification effect, produces a more stable latex matrix, and is less prone to electrolyte precipitation. Therefore, formulation A can be selected for further development, achieving rapid and quantitative formulation screening.

[0053] Example 4 This embodiment provides an apparatus system for the method of Embodiment 1, comprising: Thermostatic treatment unit: A thermostatic water bath containing a 1000mL beaker filled with distilled water (3), and a weighing bottle containing the sample placed inside the beaker. Conductivity measurement unit: Includes a multi-parameter conductivity meter connected to conductivity and temperature electrodes, used to measure the conductivity of the test solution in a 500mL beaker. This system has a simple structure, is easy to assemble, and effectively meets the requirements of this detection method.

[0054] Example 5 In this embodiment, we mainly explore whether this detection method can be used as a basis for determining the quality of latex matrix colloids: Latex matrices produced using the same manufacturing process were divided into two equal portions, A and B. Latex matrix A was sampled and tested directly using the method described in Example 1. Latex matrix B underwent five thermal cycles at -40℃ to 40℃ to accelerate its colloidal degradation before being tested using the method described in Example 1. All time conditions were identical for both samples A and B. The results showed that the average conductivity of sample A was 18.38 μS / cm, and the average conductivity of sample B was 32.8 μS / cm. This quantitatively indicates that the colloidal quality of latex matrix A is better than that of latex matrix B, and electrolytes are less likely to precipitate, which is consistent with the findings. Therefore, this testing method can be used as a basis for determining the quality of the colloidal latex matrix.

[0055] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention. For example, the constant temperature conditions can be adjusted within the range of 45-60℃ according to the characteristics of different latex matrices, and deionized water or other low conductivity solutions can be used as the aqueous medium. The sample weight and medium volume can be scaled proportionally. These variations all fall within the scope of protection of the claims of the present invention.

Claims

1. A method for detecting the quality of latex matrix colloids, characterized in that, Includes the following steps: Place the latex matrix sample to be tested in a container filled with an aqueous medium; The temperature is maintained at a preset constant temperature for a period of time, allowing the water-soluble electrolytes in the latex matrix to precipitate into the aqueous medium. Separate to obtain a test solution containing the precipitated electrolyte; The conductivity of the test solution is measured, and the quality of the latex matrix is ​​evaluated based on the conductivity value, wherein the conductivity value is negatively correlated with the quality of the latex matrix.

2. The detection method according to claim 1, characterized in that, The latex matrix is ​​an emulsion explosive latex matrix containing ammonium nitrate.

3. The detection method according to claim 1 or 2, characterized in that, The preset constant temperature condition is 50°C for 30 minutes.

4. The detection method according to claim 1 or 2, characterized in that, The steps for measuring conductivity include: reading the conductivity value when the temperature of the test liquid is compensated to 30°C.

5. The detection method according to claim 1 or 2, characterized in that, Before the isothermal step, a sample preparation step is also included: the latex matrix is ​​placed into a weighing vessel and the sample surface is made flat to prepare at least two parallel samples.

6. The detection method according to claim 5, characterized in that, In the sample preparation step, parallel samples have the same weight, flat weighing bottles are the same size, the distance between the sample liquid surface and the mouth of the vessel is controlled, and visible bubbles and impurities are eliminated.

7. The detection method according to claim 1, characterized in that, The quality of the latex matrix is ​​evaluated based on the conductivity value. Specifically, the lower the conductivity reading, the less electrolyte is released from the latex matrix, and the better the colloid quality.

8. A detection apparatus system for implementing the detection method according to any one of claims 1-7, characterized in that, include: Thermostatic processing unit is used to contain samples and provide a constant temperature environment; The conductivity measurement unit is used to measure the conductivity value of the test liquid. The constant temperature processing unit includes at least one first container for holding the aqueous medium and a second container for placing the latex matrix sample.

9. The detection device system according to claim 8, characterized in that, The second container is a flat weighing bottle, the first container is a beaker, and the flat weighing bottle is placed in an aqueous medium inside the beaker.

10. The application of the detection method according to any one of claims 1-7 in evaluating the stability of a latex matrix, characterized in that, Specifically, it is used in the production of emulsion explosives for screening latex matrix formulations, optimizing process parameters, or inspecting product quality.