Method of determining moisture capacity of solid hygroscopic objects

FIELD: chemistry.

SUBSTANCE: method of determining moisture capacity of solid hygroscopic objects includes placement of analysed objects into a hermetic container and drying until the objects are completely dehydrated. The method also includes measurement of temperature and humidity of an internal medium in the container and final determination of mathematical and graphic dependences of the object water content on equilibrium moisture of the internal medium. In the process of storing objects in the hermetic container drying to complete dehydration of objects is performed by successive introduction of samples of adsorbents and their weighing before placement into the hermetic container and after removal from it until a stable weight of the next sample of the adsorbent is set. After that, into an evaporator, mounted inside the hermetic container, portions of distilled water are successively introduced, and the hermetic container is kept under stationary temperature conditions until equilibrium humidity is set in the hermetic container with mounted in it temperature and humidity sensor. After that, the measured parameters of humidity and weight of portions of introduced distilled water are used to build a graph of dependence of the total moisture content in the analysed objects on equilibrium humidity of the internal medium of the hermetic container with mathematical determination of a value of the total moisture capacity of the analysed objects by known dependences and its dependence on equilibrium humidity in the hermetic container.

EFFECT: elaboration of the method of determining moisture capacity of solid hygroscopic objects, which makes it possible to determine the total moisture capacity of a group of hygroscopic objects.

4 dwg, 1 ex

 

The present invention relates to the field of methods for rapid control and regulate humidity in sealed containers with electronic devices to ensure the reliability of their operation.

There is a method of determining the moisture content hygroscopic solid objects (patent RF №2306549, IPC G01N 5/00, publ. 20.09.2007, including the location of the analyzed samples hygroscopic materials (wax) in the vessel, the drying up of the complete dehydration of the samples hygroscopic materials when heated, repeated measurement of temperature and humidity of the internal environment in a confined space, the final determination using mathematical formulas moisture content of hygroscopic materials by weighing the samples.

Known as a prototype method for determining water holding capacity hygroscopic solid objects (patent RF №2115916, IPC G01N 25/56, publ. 20.07.1998, including the location of the analyzed samples of bulk materials in a closed volume, the drying until complete dehydration of objects, measurement of temperature and humidity of the internal environment in a confined space, the final determination of the mathematical and graphical dependency moisture content objects from the equilibrium humidity of the internal environment in a confined space.

The disadvantage of analog and prototype is the lack of opportunities for the calculation of the total capacity of the group of objects, containing heterogeneous hygroscopic materials in an airtight container, to allow consideration of the impact of design factors and the mutual influence of objects on the measured parameters.

The aim of the invention is to develop a method for determining the capacity hygroscopic solid objects, allowing to determine the total moisture content of hygroscopic group of objects (for example, electronic devices containing heterogeneous hygroscopic materials).

A new technical result provided by the proposed method is to provide the possibility of determining the total capacity at the same time all objects in an airtight container for considering the influence of structural factors and the mutual influence of the group of objects on the measured parameters.

These task and a new technical result is ensured by the fact that in contrast to the known method, including the location of the analyzed objects in an airtight container, drying until complete dehydration of objects, measurement of temperature and humidity of the internal environment in an airtight container, the final determination of the mathematical and graphical dependency moisture content objects from the equilibrium humidity of the internal environment of the pressurized container according to the proposed method, in which the process objects are stored in an airtight container dried until complete dehydration of the objects produced by sequential introduction in an airtight container hanging adsorbents and weighing them before installing in tight the container and after removal of the until the establishment of a consistent weight of another sample of the adsorbent, and then to the evaporator, mounted inside a sealed container, successively injected portions of distilled water and incubated for an air-tight container before the establishment of equilibrium moisture in it, as measured by the temperature sensor and humidity, after which the measured value of relative humidity and mass portions entered the water to build a graph of moisture content in the analyzed objects from the equilibrium humidity of the internal environment of the pressurized container and determine mathematically by the well-known dependency of the amount of the total capacity of the analyzed objects and its dependence on the equilibrium humidity in an airtight container.

The proposed method is illustrated as follows.

Figure 1 shows a device for implementing the proposed method, where 1 is pressurized container; 2 - cover of the container; 3 - flange of the neck of the container to cover support; 4 - a sealing gasket; 5 - a bolt of fastening of a cover of the container; 6 - hygroscopic objects (electronic appliances containing hygroscopic materials); 7 - hanging absorbent (desiccant); 8 - temperature sensor and humidity; 9 - electric heater; 10 - evaporator (water tank); 11 - nozzle for pouring water into the container 12 - sealing cap socket with silicone membrane; 13 - silicone membrane; 14 - electric lock connector; 15 - wire electric.

In an airtight container 1 with the analyzed objects 6 (with hygroscopic materials) placed capacity (evaporator 10) to make distilled water without depressurization, and a sensor 8 for measuring the temperature and humidity of the internal environment in the container.

The analyzed objects 6 with hygroscopic materials in an airtight container 1 deep drain through multiple consecutive bookmarks in a sealed container pre-regenerated adsorbent 7 (desiccant, such as silica gel brand IBCS GOST 3956).

A sealed container with desiccant each time the tab was incubated for about 1 month so that the gain of the next sample desiccant was close to zero, and the relative humidity in a sealed container, as measured by the sensor 8, for a long time was constant and close to zero (figure 2, showing the dependence of the current humidity in an airtight container between storage time).

Then the sealed container 1 maximum seal by tightening its screw connections, and drained the object 6 with hygroscopic materials repeatedly moistened by entering through the membrane 13 will evaporate the eh 10 sealed container 1 by using a medical syringe certain portions of distilled water mass m.

Pressurized container 1 with humidified thus analyzed objects 6 with hygroscopic materials every time you make another portion of distilled water was incubated for ≈3 months in a stationary temperature conditions (figure 3, showing the dependence of the current humidity in an airtight container between storage time). This made the water in the container should be completely evaporate and be absorbed by hygroscopic materials in the composition of the analyzed objects so that the container has established a stable (equilibrium) the humidity of the internal environment, as measured by the sensor 8.

To accelerate the evaporation of water from the evaporator airtight container, it warmed up a miniature low-power electric heater 9, attached to the bottom of the evaporator 10.

Absolute (in grams of water) or specific (in grams of water per gram of absorbent materials) values absorption by hygroscopic materials (m) and will be characteristic of their total static capacity, but the dependence of the total static capacity of the material m from the equilibrium value of the relative humidity in a sealed container fr in the form of mathematical dependences m=f(K, fr), depicted in figure 4, will be the water sorption isotherm of these hygroscopic materials.

Thus, the use of the proposed method to determine the total capacity of all objects in an airtight container and take into account the influence of structural factors and the mutual influence of objects on the measured parameters.

The possibility of industrial implementation of the proposed method is confirmed by the following example of a specific implementation.

Example 1. In laboratory conditions on a test specimen device that represents an airtight container shown in figure 1, was implemented the proposed method. As a hygroscopic solid objects were taken placed in a sealed container 4 of the electronic device containing a hygroscopic materials such as metals and polymeric materials, among which were taken foams, polyamide, polyethylene, etc. For the complete dehydration of the analyzed objects in an airtight container by successive load placed a pre-weighed sample of the regenerated adsorbent (weighing 100 g) in the form of silicagel IBCS GOST 3956. After a time working in each of the next batches of adsorbent (≈1 month) in the process of aging airtight containers in a stationary temperature conditions (temperature ≈20°C) they were extracted from the sealed container, and the weight method was determined by the total moisture content in the analyzed the objects (≈20 g). The measurement results of the temperature and humidity in a sealed container detected by the temperature sensor and humidity, placed in an airtight container (figure 2), were laid in the basis of determining the initial and current values of these parameters during the time of storage of the sealed container with consistently placed in it by the weight of the adsorbent. Then in the evaporator, mounted inside a sealed container, successively introduced portions of distilled water (5 g, 10 g, 15 g) with a total weight of 30 g, equal to or slightly greater than the weight (20 g) absorbed moisture during drying hygroscopic objects by a series of sub-samples of the adsorbent (figure 4). Sealed container with each another portion of water was maintained to establish equilibrium moisture that was recorded by the temperature sensor (20°C) and humidity (10%, 30%, 50%, respectively, of each of the portions of water) (figure 3).

Then on the measured parameters of humidity and mass portions entered distilled water was built by the graph of the moisture content in the analyzed objects from the equilibrium humidity of the internal environment of the pressurized container (3) and deduced the mathematical dependence of the total capacity of the analyzed objects from the equilibrium humidity in a sealed container m=f(K, fr), where m is the total mass distill vannoy water, sorbed analyzed hygroscopic objects and corresponding to each value of the equilibrium moisture fr environment in an airtight container, constants, equations of mathematical dependencies.

Thus, the examples have confirmed that the use of the proposed method to determine the total capacity of all objects in an airtight container and take into account the influence of structural factors and the mutual influence of objects on the measured parameters.

The method of determining the capacity hygroscopic solid objects, including the location of the analyzed objects in an airtight container, drying until complete dehydration of objects, measurement of temperature and humidity of the internal environment in the container, the final determination of the mathematical and graphical dependency moisture content objects from the equilibrium humidity of the internal environment that distinguishes the fact that in the process of storing objects in an airtight container dried until complete dehydration of the objects produced by sequential introduction in an airtight container hanging adsorbents and weighing them before installing in an airtight container and after removal of the until the establishment of a consistent weight of another sample of the adsorbent, and then to the evaporator, mounted in the hermetic container, consistently enter the t portions of distilled water and incubated for an air-tight container in a stationary temperature conditions to establish the equilibrium humidity in a sealed container with built-in temperature sensor and humidity, after which the measured value of relative humidity and mass portions entered distilled water build a graph of the total moisture content in the analyzed objects from the equilibrium humidity of the internal environment of the pressurized container and determine mathematically by the well-known dependency of the amount of the total capacity of the analyzed objects and its dependence on the equilibrium humidity in a sealed container.



 

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