WO2023158107A1 - Method, computer program, and apparatus for providing season-simulated accelerated weathering test service - Google Patents

Abstract

Disclosed are a method, apparatus, and system for providing a season-simulated accelerated weathering test service. The apparatus for providing a season-simulated accelerated weathering test service comprises: a memory; and a processor which communicates with the memory, wherein, for an accelerated weathering test, the processor may automatically control a seasonal climate change occurring in an outdoor environment to be simulated on the basis of changes in accelerated test conditions in time series, by using the interdependence between ultraviolet irradiation intensity and temperature on deterioration of chemical materials.

Description

Method for providing seasonal simulated accelerated weathering test service, computer program and device

The present invention relates to an accelerated weathering test, and more particularly, to a weathering test technique for evaluating changes over time due to UV exposure of chemical materials and compounds by sunlight containing ultraviolet rays or artificial light sources, and seasonal simulated accelerated weathering test It relates to methods, devices and systems.

Physical and chemical stability of organic compounds, including fine chemical compounds such as cosmetics, paints, and adhesives, in addition to polymer compounds that are the main components of plastics, rubbers, and films, varies depending on the synthesis method and chemical structure.

In particular, these compounds are not stable for a long time in the outdoor natural environment, unlike most minerals collected in nature, and undergo changes over time accompanied by chemical deterioration such as oxidation and decomposition.

In particular, organic compounds exposed to outdoor sunlight are photodegraded by ultraviolet rays included in sunlight, and the degree of ultraviolet absorption and the corresponding degree of physical property degradation appear differently depending on the components of the compound constituting the chemical material.

Since product failure and quality deterioration may occur through deterioration over time during use of products made of chemical materials such as plastic or rubber, the industry treats the durability quality evaluation of chemical materials as an important element technology.

The weather resistance test is to prevent and predict failures and quality deterioration due to material deterioration in advance by predicting and evaluating changes over time when exposed to sunlight and artificial light sources, including ultraviolet rays, in advance. It relates to an accelerated test method that reproduces and simulates the degradation of chemical materials that occurs in the use environment in the shortest possible time.

Currently, the most widely used weather resistance test method is accelerated photodegradation using xenon-arc lamps, metal-halide lamps, ultraviolet-fluorescent lamps, luminescent plasma lamps, etc. recognized as capable of simulating ultraviolet rays included in sunlight as light sources. There is a test method.

In addition to using a lamp recognized to have the ability to mimic solar ultraviolet rays, most of the accelerated weathering test devices are a radiant temperature measuring device called a black panel thermometer or black standard thermometer in order to well simulate the deterioration over time that occurs in an outdoor environment. It is equipped with a humidity control device and is equipped with a device that can control the moisture contact on the specimen surface, including a water spray or moisture condensation device.

This means that not only photodegradation by ultraviolet rays but also thermal deterioration by radiant heat of visible and infrared rays included in sunlight cannot be ignored in the change over time of chemical materials exposed to the outdoor environment, and in addition, temperature and moisture for photodegradation by ultraviolet rays This is because there is a synergistic effect of

As a result, in the weather resistance test, in addition to the technology that simulates sunlight and ultraviolet rays, the radiant heat of sunlight and the resulting temperature of the radiant surface (Black Panel Temperature (BPT) and Black Standard Temperature (BST)) and the effect of contact with water occur in the field. It is comprehensively reflected in the simulation of the reality of deterioration.

On the other hand, the natural phenomena of the outdoor environment have constantly repeated periodic changes expressed as daily temperature difference and annual temperature difference according to the earth's rotation and revolution with respect to the sun. Not only does it have a direct effect, but it also has a great impact on the deterioration of chemical materials in the field through evaporation and condensation of moisture, seasonal temperature change, and rainy season caused by monsoons such as subtropical monsoons.

In fact, the seasonal climate of Korea also has a regularity in which the summer season has very humid and hot weather and the winter season has relatively dry and cold weather due to the concentrated seasonal rainfall phenomenon called the rainy season. It is changing seasonally according to the orbital cycle, but there is currently no known weather resistance test technology that simulates it.

Except for the weather resistance test by the outdoor exposure test method that attempts direct exposure to sunlight in an outdoor environment, all weather resistance test technologies currently using indoor accelerated weather resistance test devices do not provide test technology that reflects seasonal changes. Can not do it.

As a result, there is a lack of realistic simulation of deterioration that occurs in an actual field environment, so field deterioration or failure mechanisms cannot be reproduced, or the accelerated deterioration of accelerated weathering tests varies greatly depending on materials, test conditions, and physical property standards. this may cause In severe cases, the problems caused by the lack of mimicry are used as grounds for dismissing the accelerated weathering test as useless or worthless technology.

The main reasons why the accelerated weathering test cannot simulate the seasonal change that exists in the field climate in the accelerated test despite these serious defects are as follows.

First, an accelerated test technique capable of simulating seasonal climate change has not yet been developed.

Next, it is because of the limitations of temperature and precipitation reproduction conditions of the chamber environment of the accelerated weathering tester. Although it may vary depending on the characteristics of a given device and lamp, the control range of black panel temperature (BPT) or black standard temperature of most accelerated weathering testers is not sufficient to simulate the diversity and seasonal changes of the natural climate environment.

Finally, if the thermal deformation or thermal decomposition temperature of the chemical material applied to the test is not high, the increase in applicable test temperature is limited, so it is difficult to use a higher UV irradiation intensity and a higher black panel temperature (BPT) than the actual field environment. In accelerated test conditions, there is a limitation in simulating the climatic conditions of the high temperature season.

Therefore, the conventional accelerated weathering test method, which assumes that the actual climatic conditions are fixed to specific conditions and continues under the corresponding constant test conditions, has a limitation in that it cannot properly reflect seasonal changes generated by the actual climate as the test conditions.

In order to solve the above problems, one task of the present invention is to enable an accelerated test for seasonal change simulation to be performed regardless of whether or not the test temperature changes in simulating real climate change under accelerated test conditions.

Another task of the present invention is to design test conditions based on real climate data, including a cycle change method having a periodic change pattern that formalizes seasonal change as an accelerated test condition, and a test principle that simulates it as an accelerated test condition through this. It is to provide an accelerated weathering test method, program, and device with a built-in program.

The technical problems to be achieved in the present invention are not limited to the above technical problems, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

A seasonal simulated accelerated weathering test apparatus according to an embodiment of the present invention for solving the above problems includes a memory; And a processor communicating with the memory, wherein the processor uses interdependence of temperature and ultraviolet irradiation intensity that affect the deterioration of chemical materials for an accelerated weathering test, so that seasonal climate change occurring in the outdoor environment is accelerated on a time series. It can be automatically controlled to be simulated based on changes in test conditions.

A method for testing seasonal simulated accelerated weathering resistance according to an embodiment of the present invention includes receiving a request for an accelerated weathering test through a terminal; and performing the requested accelerated weathering test, wherein the accelerated weathering test uses the mutual dependence of temperature and UV irradiation intensity on the deterioration of chemical materials, so that seasonal climate change occurring in the outdoor environment is accelerated in time series. It can be automatically controlled to be simulated based on changing test conditions.

A seasonal simulated accelerated weathering test system according to an embodiment of the present invention includes a terminal for requesting the accelerated weathering test and inputting various data; and a computing device that performs the requested accelerated weathering test, wherein the computing device uses the mutual dependence of temperature and UV irradiation intensity on the deterioration of chemical materials for the accelerated weathering test to determine the seasonality occurring in the outdoor environment. It may include a processor that automatically controls climate change to be simulated based on changes in accelerated test conditions on a time series.

According to the present invention, the effects described below can be obtained. However, effects obtainable through the present invention are not limited thereto.

According to the present invention, it is possible to provide improved field environment mimicry that can realistically simulate various physicochemical deterioration, product failure, etc. in a real field environment that were difficult to reproduce with conventional test methods.

According to the present invention, a test principle that simulates accelerated test conditions based on real climate data, including a cycle change method having a periodic change pattern in which seasonal changes are formalized into accelerated test conditions, and a computer program for designing test conditions through this This built-in accelerated weathering test device can be provided.

1 is a schematic diagram of an accelerated weathering test system according to an embodiment of the present invention.

FIG. 2 is a block diagram of the computing device of FIG. 1 .

3 is a conceptual diagram illustrating an accelerated test of seasonal climate change with a wave model by simultaneous change of UV irradiation intensity and test temperature according to an embodiment of the present invention.

4 is a graph of change in black panel test temperature (BPT) reflecting the annual temperature difference of the accelerated weathering test method divided into four seasonal change stages simulating the central region of Korea according to an embodiment of the present invention.

5 is a graph of change in black panel test temperature (BPT) reflecting the annual temperature difference of the accelerated weathering test method divided into 12-month change stages simulating the central region of Korea according to an embodiment of the present invention.

FIG. 6 is a graph illustrating monthly temperature changes in which 120 regions around the world are divided into three regions according to an embodiment of the present invention.

7 is a graph of annual temperature variation divided into representative characteristics of three regions according to an embodiment of the present invention.

8 is a graph for accelerating simulation of seasonal climate change in the central region of Korea according to a trigonometric function model change of ultraviolet irradiation intensity according to an embodiment of the present invention.

9 is a graph of accelerated simulation of seasonal climate change in the central region of Korea according to a trigonometric function model change of test temperature according to an embodiment of the present invention.

10 is a graph illustrating an ultraviolet irradiation intensity-test temperature (BPT) change curve of an accelerated weathering test simulating seasonal climate change in the central region of Korea according to an embodiment of the present invention.

FIG. 11 is a graph illustrating a simultaneous change curve of ultraviolet irradiation intensity-test temperature (BPT) of an accelerated weathering test simulating seasonal climate change in the central region of Korea according to an embodiment of the present invention.

FIG. 12 is a graph illustrating an ultraviolet irradiation intensity-test temperature (BPT) simultaneous change curve of an accelerated weathering test simulating seasonal climate change in the central region of Korea according to an embodiment of the present invention.

13 is a graph of annual change in monthly average maximum temperature and precipitation showing seasonal climate change in the central region of Korea according to an embodiment of the present invention.

14 is a graph of changes in test temperature (BPT) and water injection ratio according to monthly stages of an accelerated weathering test simulating seasonal climate change in the central region of Korea according to an embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. The detailed description set forth below in conjunction with the accompanying drawings is intended to describe exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced.

Only these embodiments are provided to complete the disclosure of the present invention and to fully inform those skilled in the art of the scope of the invention to which the present invention belongs, and the present invention will be defined by the scope of the claims. only

In some cases, in order to avoid obscuring the concept of the present invention, well-known structures and devices may be omitted or may be shown in block diagram form centering on core functions of each structure and device. In addition, the same reference numerals are used to describe like components throughout this specification.

Throughout the specification, when a part is said to "comprising" or "including" a certain element, it means that it may further include other elements, not excluding other elements, unless otherwise stated. do.

In addition, the term "unit" described in the specification means a unit that processes at least one function or operation, which may be implemented as hardware, software, or a combination of hardware and software. Further, "a or an", "one", and similar related terms, in the context of describing the present invention, are both singular and plural unless otherwise indicated herein or clearly contradicted by context. It can be used in the meaning of including.

In addition, specific terms used in the embodiments of the present invention are provided to aid understanding of the present invention, and unless otherwise defined, all terms used herein, including technical or scientific terms, are intended to support the present invention. It has the same meaning as commonly understood by a person of ordinary skill in the art to which it pertains. The use of these specific terms may be changed in other forms without departing from the spirit of the present invention.

Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a schematic diagram of an accelerated weathering test system according to an embodiment of the present invention. FIG. 2 is a block diagram of the computing device 150 of FIG. 1 .

Referring to FIG. 1 , an accelerated weathering resistance test system according to an embodiment of the present invention may include a terminal 100 and a computing device 150 . However, it is not limited thereto, and one or more components other than the components shown in FIG. 1 may be further included to implement the accelerated weathering resistance test system according to the present invention.

The terminal 100 may be a device requesting an accelerated weathering test. The terminal 100 may input data necessary for the accelerated weathering test through an interface. The interface may be provided by the computing device 150, and may be in any one form of an application form, a web service form, an application programming interface (API), a plug-in, and the like. The accelerated weathering test request and input data may be transmitted to the computing device 150 and used for the accelerated weathering test.

The terminal 100 may be at least one of a fixed terminal such as a PC, TV, or monitor, a mobile terminal such as a smart phone, a lap-top, or a tablet PC, and a terminal dedicated to an accelerated weathering test.

The terminal 100 may include an input device for inputting an accelerated weathering test request and various data (eg, condition setting), and an output device for outputting result data according to the accelerated weathering test request.

The computing device 150 may perform an accelerated weathering test simulation according to the request for the accelerated weathering test of the terminal 100 and provide a simulation result. At this time, the computing device 150 may refer to the data input by the terminal 100 for the accelerated weathering test.

Referring to FIG. 2 , a computing device 150 may include a memory 210 and a processor 220 . At this time, the memory 210 may perform a function such as a database (DB), and may store all or part of data collected, processed, processed, etc. by the computing device 150 . In addition, the memory 210 may previously store a computer program or mathematical model and related data according to the present invention. The computer program or mathematical model may be written based on artificial intelligence (AI).

The processor 220 may perform an accelerated weathering test simulation for chemical materials based on the computer program or mathematical model, and provide simulation results and related data.

A description of the accelerated weathering resistance test method according to various embodiments of the present invention is as follows.

The computing device 150 according to the present invention may provide an accelerated weathering resistance test method simulating seasonal change in which seasonal climate change occurring in actual natural conditions is reflected in a weather resistance test of a chemical material and a product using the same. Meanwhile, it is noted in advance that the corresponding content may be processed or performed by the computing device 150 even if not specifically specified below.

The term "weather resistance test" described herein means a durability test in which the rate of long-term change is influenced by climatic factors such as sunlight, temperature, precipitation, and humidity.

Unlike indoor accelerated weathering test conditions under fixed conditions that continuously repeat certain conditions, actual natural climatic conditions have the characteristics of climate change according to seasonal changes over time. The range of change in climatic conditions due to seasonal changes tends to be larger as the latitude increases and inland away from the coast.

The cycle of seasonal climate change has a common regularity, which is a time-series change for one year in any climate. Seasonality is reflected in test conditions in an outdoor exposure test in which a specimen or product is directly exposed to natural sunlight in an outdoor environment, but is not reflected in an accelerated weather resistance test in which constant test conditions are continued.

In this way, unlike the conventional accelerated weathering test method that cannot reflect seasonality, the computing device 150 according to the present invention provides an accelerated weathering test method that reflects seasonality with a time-series change simulating seasonal change with respect to test conditions. can do.

For this purpose, the computing device 150 is a multi-stage test condition change based on climate data representing 4 seasons, monthly representing 12 months, and daily representing 365 days, or continuous test conditions based on a wave-type trigonometric function model. A computer program or model (or algorithm) that controls the change is defined, and through it, the corresponding seasonal climate change can be applied to the weather resistance test.

In order to simulate these seasonal changes under accelerated test conditions, the computing device 150 according to the present invention tests using the relationship between UV irradiation intensity and temperature (hereinafter referred to as 'correlation principle'), which affect the deterioration of chemical materials. provides a way

This test method is based on the test principle that changes in UV irradiation intensity, together with temperature changes, have an important effect on the deterioration of chemical materials interdependently. It can be simulated as a test condition.

Based on the correlation principle of the computing device 150, a condition of increasing the intensity of UV irradiation may be used instead of lowering the temperature to simulate the winter season when the temperature is low, and on the contrary, UV irradiation is performed instead of raising the temperature to simulate the summer season when the temperature is high. Conditions that lower the intensity may be used.

Therefore, according to the present invention, an accelerated test method that simulates the seasonal climate change of chemical materials, which was impossible to apply a high test temperature and a wide range of test temperature changes due to thermal deformation or thermal decomposition, This can be done under the condition of minimizing

For example, the computing device 150 can rapidly simulate changes in deterioration conditions of chemical materials due to seasonal climate change only by changing the UV irradiation intensity sequentially in a time series while the test temperature is constantly fixed.

That is, the computing device 150 sequentially lowers the UV irradiation intensity according to the step when the temperature rises from the winter season to the summer season, and conversely increases the UV irradiation intensity when the temperature goes down from the summer season to the winter season. You can control it.

Through this method, the present invention can simulate seasonal changes in summer with relatively abundant insolation and winter with insufficient insolation under accelerated test conditions, and also reflect water contact conditions that faithfully simulate actual seasonal climate changes in step-by-step test condition changes. By doing so, it is possible to improve field reproducibility of deterioration of chemical materials occurring in actual natural climatic conditions and related quality problems.

Seasonal simulated accelerated weathering resistance test method according to an embodiment of the present invention uses a test method that provides changes in time series by simulating the change in climatic conditions according to the change of season as a test principle of the UV irradiation intensity-test temperature interdependence relationship. do. However, the present invention is not necessarily limited thereto.

According to the present invention, it is possible to provide improved field environment simulation that can realistically simulate various physicochemical deterioration, product failure, etc.

At this time, the "ultraviolet ray irradiation intensity-test temperature correlation (ie, correlation principle)" described in this specification, in simulating the climate of a specific region as a realistically simulated accelerated deterioration condition, the relationship between the ultraviolet ray irradiation intensity and the test temperature is interconnected like a string, meaning that a change in one condition is accompanied by a change in another condition.

3 is a conceptual diagram illustrating an accelerated test of seasonal climate change with a wave model by simultaneous change of UV irradiation intensity and test temperature according to an embodiment of the present invention.

3 may be a conceptual diagram of an accelerated test simulating seasonal climate change according to the correlation principle.

Referring to FIG. 3, the horizontal center line 310 can be viewed as a fixed value of UV irradiation intensity and test temperature regardless of seasonal climate change, and the other test conditions are expressed as periodic wave-like changes to simulate seasonal change. It can be.

When the computing device 150 simulates seasonal climate change under accelerated test conditions, fixing the test temperature (Black Panel Temperature (BPT)) simulates seasonal climate change with a wave-type periodic change in UV irradiation intensity. can do.

At this time, unlike natural phenomena, a method of increasing the UV irradiation intensity to simulate the winter season and lowering the UV irradiation intensity to simulate the summer season may be used.

This is because both the temperature and the amount of solar radiation (or the intensity of ultraviolet irradiation) decrease in the winter season in a natural phenomenon, so the Black Panel Temperature (BPT), which symbolizes the winter season, also decreases, and conversely, both the temperature and the amount of solar radiation (or the intensity of ultraviolet irradiation) increase in the summer season. This is because the black panel temperature (BPT), which symbolizes the summer season, also rises.

However, according to the principle of correlation of the present invention, increasing the above-described UV irradiation intensity produces the same effect as lowering the test temperature, and conversely, lowering the UV irradiation intensity can generate the same effect as raising the test temperature.

On the other hand, referring to FIG. 3, in the method of fixing the black panel temperature (BPT) and changing the ultraviolet (UV) irradiation intensity in a wave-like cycle according to seasonal climate change, on the contrary, fixing the ultraviolet (UV) irradiation intensity and changing the black panel temperature (BPT) to a wave-like cycle that simulates seasonal climate change.

In addition, the correlation principle of the present invention may include not only a method of periodically changing only one condition of the above-described test temperature or UV irradiation intensity, but also a method of simultaneously changing the UV irradiation intensity and test temperature. That is, in the winter season, the UV irradiation intensity increases and the test temperature decreases, and in the summer season, the UV irradiation intensity decreases and the test temperature increases.

Referring to FIG. 3, the change in the UV irradiation intensity and the test temperature has a phase difference corresponding to 1/2 of the repetition period in the period change represented by the wave-type trigonometric function, and is symmetrical with respect to the horizontal line 310. It shows the time series change of trend.

According to the correlation principle of the present invention, when either one of the ultraviolet irradiation intensity or the test temperature is moved in a direction in which the change amplitude of another condition becomes smaller, the amplitude of the other test condition can be simultaneously reduced according to the correlation principle.

Therefore, the method of changing the UV irradiation intensity and test temperature shown in FIG. 3 can simulate seasonal climate change with a remarkably reduced amplitude compared to the amplitude of change in which one condition is fixed and the other condition is changed. This can simulate seasonal climate change while minimizing the amplitude of change in test conditions, so it can be usefully referenced to overcome the performance limit of accelerated weathering test equipment or the limit of temperature control by material characteristics.

In the above, the computing device 150 may adjust the period and amplitude to reflect the diversity of weather and material characteristics.

The computing device 150 according to the present invention, based on the correlation principle, can solve the technical problem for simulating seasonality change, which was difficult to implement in the conventional accelerated weathering test method.

The computing device 150 provides a method of simulating the annual temperature change by simulating the seasonal climate change with an accelerated test condition by a wave-type periodic change and dividing the test condition steps on the time series described later into at least two steps and up to 365 steps. can do.

The computing device 150 may use a method of dividing the annual temperature change step into four seasonal change steps of spring, summer, autumn, and winter, and a method of dividing the change step by 12 months from January to December among these step-by-step change methods. can

At this time, the computing device 150 may simplify the annual temperature difference into three stages by operating spring and fall as one condition in relation to the method of dividing the four seasons into four stages, through which the seasonality changes. can be performed with simpler, standardized test conditions.

4 is a graph of change in test temperature (BPT) reflecting annual temperature difference in an accelerated weathering test method divided into four seasonal change stages simulating the central region of Korea according to an embodiment of the present invention.

In FIG. 4, the black panel temperature (BPT) change can be seen as an example of a test method that simulates the seasonal change in the central region of Korea (eg, Daejeon).

Referring to FIG. 4 , the computing device 150 is tested under three test temperature conditions: a step corresponding to winter (BPT 59 ° C., a step corresponding to spring and autumn (BPT 67 ° C.) and a step corresponding to summer (BPT 75 ° C.) It can be tested by dividing the four seasons into four distinct stages.

On the other hand, instead of the four-season climate change classification method, for example, as shown in FIG. 5, a 12-month change phase classification method that simulates monthly climate change may be used to simulate seasonal climate change.

However, the 12-month change phase classification method that simulates monthly climate change reflects the tendency of increasing insolation or temperature in several stages when simulating the change in spring, and reflects the tendency for the amount of solar radiation or temperature to decrease in several stages when simulating the change in autumn. Because it reflects the trend, it may be difficult to use the phase change of spring and autumn under the same conditions, such as the four-season change phase method that divides into four phases.

5 is a graph of change in black panel temperature (BPT) reflecting the annual temperature difference of the accelerated weathering test method divided into 12-month change stages simulating the central region of Korea according to an embodiment of the present invention.

FIG. 5 shows the change in black panel temperature (BPT) required for the accelerated weathering test method in which the seasonal climate change simulating the central region of Korea in FIG. 4 is divided into 12-step monthly climate change.

Referring to FIG. 5 , it can be seen that, unlike in FIG. 4 described above, changes in the black panel temperature (BPT) corresponding to spring and autumn are the same or not symmetrical. That is, seasonal climate change according to regional climate characteristics in real climate simulation may not match the mathematical model expressed as a wave-type cycle.

Accordingly, the computing device 150 according to the present invention may provide two methods for performing a wave-type periodic change of test conditions simulating seasonal climate change.

One is to deviate from the symmetrical wave cycle of mathematical functions and follow individual and unique change curves as a method of simulating real climate that reflects the diversity and specificity of climate conditions by region. In this regard, FIG. 5 may be an example showing a test temperature change curve under a unique accelerated test condition following the unique climatic conditions of the central region of Korea.

The other is to standardize the unique individual characteristics of the local climate and simulate relatively simplified wave-like periodic variations. For example, the computing device 150 according to the present invention may use a method of standardizing, as a test condition, a regularity of seasonal climate change occurring in the diversity of annual variations according to the diversity of climate around the world. Accordingly, the computing device 150 may provide a method of simulating the annual temperature range characteristics of each region of the world as it is with climate change and a method of representing climate change with standardized annual temperature characteristics. That is, the computing device 150 analyzes the annual temperature range characteristics based on monthly temperature change data identified around major urban areas around the world, and simulates this as an accelerated test condition for each corresponding area.

FIG. 6 is a graph illustrating monthly temperature changes in which 120 regions around the world are divided into three regions according to an embodiment of the present invention.

6 (a) to (c) may be, for example, graphs created with the month having the lowest temperature as the starting point. However, the present invention is not limited thereto.

In order to extract standardized conditions, the computing device 150 may divide the annual crossover characteristics into three characteristics, as shown in (a) to (c) of FIG. 6 , and use them. In this case, the computing device 150 may use a test method in which a small annual temperature difference of less than 10°C and an average of 5°C is reflected in an area at a relatively low latitude and affected by an oceanic climate.

7 is a graph of annual temperature variation divided into representative characteristics of three regions according to an embodiment of the present invention.

The computing device 150 may use a test method in which an annual temperature difference of 20° C. is reflected on average for most metropolitan areas in which seasonality is evident in mid-latitude. On the other hand, for regions with relatively high latitudes and continental climates, a test method that reflects the average annual temperature difference as 35°C can be used. However, the classification of annual crossings for standardization of test conditions of the present invention is not limited to the above three classification methods. In other words, other divisions such as 2 or 4 (divided by 10 °C annual temperature) may also be used depending on the purpose and material characteristics of the test method for reflecting the annual temperature difference according to the present invention.

In addition, in order to solve the problem due to the limitation of temperature and precipitation reproducibility of the chamber environment of the accelerated weathering tester, the computing device 150 is a unique test using the correlation between the ultraviolet irradiation intensity and the test temperature described below. The law can be made available.

According to the correlation principle of the method of simulating seasonal climate change according to the present invention, increasing the intensity of ultraviolet irradiation or the intensity of irradiation of a lamp emitting light containing ultraviolet rays has the same correlation effect as lowering the test temperature. . Conversely, lowering the UV irradiation intensity or the irradiation intensity of a lamp that emits light containing ultraviolet has the same correlation effect as raising the test temperature.

This correlation is opposite to the natural phenomenon in which UV irradiation intensity or solar radiation and temperature are proportional to each other. In other words, increasing the UV irradiation intensity or lamp output in climate phenomena or general environmental test conditions causes the effect of raising the air temperature or the temperature of the environmental chamber. can make it This mutual proportional effect is also the same as the black panel temperature (BPT) and black standard temperature (BST) of the weather resistance test device that measures radiant heat.

Therefore, it can be seen as a general phenomenon that areas with low temperatures have low insolation and a low intensity of ultraviolet ray irradiation, whereas areas with high temperatures have high amounts of insolation and high irradiance of ultraviolet rays at that time.

Seasonal climate change likewise reduces the amount of insolation during the winter season when the temperature is low, and the intensity of UV irradiation at that time decreases, and the amount of insolation increases during the summer period when the temperature is high, and the intensity of UV irradiation at that time also increases. In order to simulate these seasonal climate changes as they are, a wide range of UV irradiation intensity and test temperature change devices that can implement seasonal climate changes for various climates as additional temperature changes are required.

However, in the conventional weather resistance test apparatus, the lamp output is fixed, realizing a test temperature that reflects various regional climate characteristics, and furthermore, temperature control performance that can simulate seasonal changes is not provided.

Another problem in the conventional weather resistance test method for test temperature change in another aspect is that high temperature application becomes impossible as thermal deformation or thermal decomposition of chemical materials occurs.

Since it is common to test at a higher temperature than the field condition in accelerated weathering tests that use accelerated aging conditions rather than actual field environmental conditions, even when thermal deformation and thermal decomposition do not occur in field conditions, accelerated aging conditions that simulate them Thermal deformation and thermal decomposition may occur.

In particular, this problem occurs in general-purpose plastics having a low heat distortion temperature. For example, high-density polyethylene (HDPE) has a representative heat distortion temperature of 85°C, polystyrene at 95°C, and ABS resin at 98°C. Depending on the detailed characteristics of the corresponding polymer material, thermal deformation may occur even at a temperature below the representative value. In particular, in the case of a black color, the test piece receives radiant heat up to a temperature higher than the black panel temperature (BPT) under given test conditions. Therefore, thermal deformation can easily occur. When thermal decomposition as well as thermal deformation occurs, evaluation of physical properties using a test piece becomes impossible in most cases, so the technical validity or reliability of the weather resistance test may be a problem.

Therefore, due to the lack of control capability of the device itself and the use temperature limit of the material to be tested, the condition change of the accelerated test to reflect the seasonal climate change is limited, which can be a problem in most seasonal climate change simulation tests.

The computing device 150 according to the present invention provides a solution capable of overcoming the difficulty in changing the test temperature for simulating seasonal climate change, based on the principle of correlation between the intensity of ultraviolet irradiation and the test temperature.

According to the correlation principle, the same effect as raising the test temperature can be achieved by lowering the UV irradiation intensity, and the same effect as lowering the test temperature can be achieved by increasing the irradiation intensity.

According to an embodiment of the present invention, the computing device 150 may implement accelerated test conditions simulating seasonal climate change by fixing the test temperature and adjusting only the UV irradiation intensity, that is, by changing only the UV irradiation intensity.

This provides a seasonal climate change simulation method that solves the problem of seasonal climate change simulation due to the narrow test temperature control range of the device and the test material problem due to thermal deformation and thermal decomposition.

The computing device 150 according to the present invention applies the correlation principle to change the test temperature in time series to simulate seasonal climate change, but does not reach the temperature to be simulated due to problems with equipment or test material characteristics. If it is not possible, from that point on, seasonal climate change can be simulated by fixing the test temperature and lowering the intensity of ultraviolet radiation.

In simulating seasonal climate change, this method can be seen as a mixed method in which test temperature change and ultraviolet irradiation intensity change are applied separately based on a specific test temperature.

Another method of mixing is to change the UV irradiation intensity and the test temperature together in the entire range of accelerated test conditions.

In particular, this method can provide the advantage of simulating a wide range of seasonal changes by making the most of the lamp's ability to adjust the irradiation intensity and the test temperature adjustment range.

However, since the natural climate change characteristics generally have a mutual relationship in which temperature, solar radiation, and UV irradiation intensity change proportionally together, the method of changing the UV irradiation intensity and test temperature together in the entire test section is an intuitive understanding of seasonal changes. However, it is difficult to design accelerated test conditions.

The correlation principle according to an embodiment of the present invention is applied to simulation as an accelerated test condition based on actual climate data of a specific region, but it can also be applied to simulation of seasonal climate change commonly represented by a wider range of climates. there is. For example, an effective method for simulating seasonal changes in a wide range of climates is to express annual and seasonal climate changes in the form of trigonometric functions with periodic waves.

Figure 8 shows the change in ultraviolet irradiation intensity simulating the seasonal climate change of the present outbreak, for an area where the annual temperature difference (ΔT) through seasonal climate change reaches 25 ° C, such as the central region of Korea.

Referring to FIG. 8 , it is shown that the black panel temperature (BPT) is fixed at 65° C., and the seasonal climate change throughout the year can be simulated by the wave-type periodic change of the ultraviolet irradiation intensity.

That is, based on the principle of correlation according to an embodiment of the present invention, instead of lowering the test temperature in the winter season when the temperature is low, the accelerated test condition is replaced by increasing the UV irradiation intensity up to 166 W/m ² , and conversely, when the temperature is high In summer, the accelerated test condition can be replaced by lowering the UV irradiation intensity to a minimum of 60 W/m ² instead of raising the test temperature.

Therefore, as a test method for simulating seasonal climate change of the present invention, a method of changing the UV irradiation intensity into a wave-type trigonometric function model even when the test temperature is fixed is exemplified.

In addition, FIG. 9 shows seasonal climate change in the same area (central region of Korea) as in FIG. 7 by replacing the change in UV irradiation intensity with the change in test temperature according to the principle of the present invention.

The change in UV irradiation intensity and test temperature applied here is an example of a test method for simulating seasonal climate change of UV irradiation intensity and test temperature in which the repetition cycle of waves is applied as a trigonometric function model according to the rule of repetition cycle corresponding to one year in the field. Can be seen as.

Unlike that shown in FIG. 7, instead of fixing the UV irradiation intensity to 113 W/m ² , the test temperature is lowered to a minimum of 52° C. in the winter when the temperature is low, and the test temperature rises to a maximum of 78° C. in the summer when the temperature is high. Acceleration is simulated as a wave-like periodic change.

Although this does not strictly simulate the actual seasonality of a specific region, it can be a method of simulating the seasonality of a wide range of climates in a relatively simple way.

As such, the seasonal climate change simulation method by the wave-type cycle change that can be expressed as a trigonometric function is compared with the accelerated weathering test method using a fixed test temperature or a fixed UV irradiation intensity throughout the cycle period, the seasonal climate of the present invention It can be useful as a test technique that reflects change.

On the other hand, many accelerated weathering test standards represented by ISO 4892-2 are weathering test methods that represent a wide range of climates without specifying climate and region. A method of fixing the UV irradiation intensity and the UV irradiation intensity under constant conditions was proposed.

The present invention is a method of applying a wave-type trigonometric function by fixing the test temperature and changing the UV irradiation intensity, away from the method of continuously using a fixed test temperature and UV irradiation intensity regardless of the cycle period used in conventional weather resistance test methods. , or conversely, by fixing the intensity of UV irradiation and changing the test temperature by applying a wave-type trigonometric function, seasonal climate change can be simulated under accelerated test conditions.

Therefore, the test condition in the form of a wave expressed as a trigonometric function changes the change period (2π given in the function), which means seasonal change during one year, or the amplitude of the trigonometric function, which means the amount of change in UV irradiation intensity or test temperature. It can be diversified by changing .

Diversification of the period and amplitude of seasonal changes expressed as trigonometric functions can be used as a way to reflect the diversity of climate and the diversity of test materials.

The correlation principle according to an embodiment of the present invention may provide a method of simultaneously changing the UV irradiation intensity and the test temperature in addition to the method of periodically changing the UV irradiation intensity or the test temperature described above. That is, if one of the ultraviolet irradiation intensity or the test temperature is moved in the direction in which the change amplitude of the other conditions becomes smaller, the amplitudes of the other test conditions can be simultaneously reduced due to a mutual relationship. In this method, the UV irradiation intensity increases in the winter season and the test temperature decreases, and conversely, the UV irradiation intensity decreases and the test temperature increases in the summer season.

As a result, the method of simultaneously changing the UV irradiation intensity and the test temperature according to the present invention can simulate seasonal climate change with an amplitude that is significantly reduced above the threshold value, compared to the amplitude of change in which one condition is fixed and the other conditions are changed. there is.

Since this method can simulate seasonal climate change while minimizing the change amplitude of test conditions, it can overcome the performance limitation of accelerated weathering test equipment or the limitation of temperature control by material characteristics.

Also in this method, the cycle and amplitude can be adjusted to reflect the diversity of weather and material characteristics.

In particular, the method of testing the UV irradiation intensity and the test temperature at the same time as a wave-shaped periodic change reflects the natural temperature change due to seasonal climate change as an accelerated test condition, so that the physical change due to the temperature change in the field can also be seen in the accelerated test. It has the advantage of being able to reflect and at the same time giving the tester intuition for seasonal changes in test conditions.

As a result, the correlation principle of simulating the seasonal climate change of the present invention under accelerated test conditions can be used either as a monthly phase change of 4 seasons and 12 months or as a wave-like periodic change of a trigonometric function model. .

As a method of applying the former step change to the weather resistance test device, a method of manually inputting the test condition change of each step or a method of selecting a test menu reflecting the corresponding test condition change can be used, and the latter wave-type cycle can be used for seasonal climate The method of applying the change to the weather resistance test device is to select the period and amplitude of the wave at the standard UV irradiation intensity and test temperature, and then change the test conditions with periodic and continuous changes during the test period using a trigonometric function model. there is.

Therefore, it is difficult to properly apply the method of reflecting the change in the wave-type cycle of the latter by dividing the test conditions into multiple stages and manually inputting them, and automatic control that continuously changes the UV irradiation intensity and test temperature through a program that calculates them method can be used.

In explaining the accelerated weathering test method simulating seasonal changes according to the present invention, a method of testing with time series changes of accelerated test conditions simulating seasonal climate changes in the central region of the Republic of Korea (area near Daejeon) will be described as an example.

This method does not simulate the climate of the region as an annual average, but understands it as a periodic climate change rule from January to December and simulates it.

The change in each phase does not undergo radical change because it changes in adjacent months, but changes continuously through a continuous and annual cycle.

In the accelerated weathering test conditions for simulating seasonal climate change in the central region of Korea (Daejeon) in FIG. 10, the test temperature (BPT) was fixed at, for example, 64° C., and only the UV irradiation intensity was simulated according to the seasonal climate change.

Referring to FIG. 10, the accelerated weathering test temperature is fixed at 64° C. based on the black panel temperature (BPT) to maintain a temperature equal to or slightly lower than the test temperature used in the conventional accelerated weathering test conditions, thereby maintaining a polymer having a low heat distortion temperature. Do not exceed a temperature more than 20°C lower than the heat deflection temperature of materials such as high-density polyethylene, polystyrene, and ABS materials.

Therefore, seasonal climate change conditions can be simulated without concerns about thermal deformation or thermal decomposition of polymer materials and other chemical materials having a low thermal distortion temperature.

At the same test temperature, the same effect as lowering the test temperature can be obtained by increasing the UV irradiation intensity in the winter season, and the effect can be substituted by lowering the UV irradiation intensity instead of raising the test temperature in the summer season.

On the other hand, since the method of simulating seasonal climate change under accelerated test conditions of the present invention uses a method of sequentially changing test conditions on a time series, it is necessary to adjust the test time length of each step.

Changes in test conditions according to the accelerated test step of the present invention progress sequentially according to seasonal changes, but the test time given at that time may not be given in proportion to the length of time each season has.

That is, in the test method reflecting the seasonality of the present invention, the seasonal change in the amount of UV irradiation throughout the year is simulated, and the test conditions corresponding to the season with high UV exposure are allocated to the test time appropriate to it, and the season with low UV exposure is conversely. By shortening the test conditions corresponding to the corresponding test time by an appropriate test time, the computing device 150 may provide a method of simulating UV degradation occurring in an actual natural environment according to seasonal changes.

Therefore, according to the present invention, the test time proportion of the test conditions corresponding to the summer climatic conditions with a large amount of UV exposure is increased, and the test time proportion of the test conditions corresponding to the winter climatic conditions with a small amount of UV exposure is lowered, Reproducibility for natural deterioration can be further improved.

Next, as another example of the accelerated weathering test method that simulates the seasonal change of the present invention, a test method that simulates the seasonal climate change in the central region of Korea (the area near Daejeon) with accelerated test conditions based on a wave-type trigonometric function model Explain.

The method used here is to test the UV irradiation intensity and the test temperature with periodic changes in the form of waves at the same time, while minimizing the change amplitude of the test conditions and simulating the seasonal climate change, thereby limiting the performance of the accelerated weathering test equipment or material properties. It is useful for overcoming the limitations of temperature control by

Looking at the change in the monthly test conditions according to each season of FIG. 11, the ultraviolet irradiation intensity, for example, from the highest 138 W / m ² in February to the lowest 82 W / m ² in August, having a repeating cycle of 1 year It can be seen that the wave-type change simulates the seasonal change.

The change range of this ultraviolet ray irradiation intensity becomes a test condition that can be performed in a conventional weather resistance tester using, for example, a xenon-arc lamp.

Referring to FIG. 11, looking at the black panel temperature (BPT) change of monthly test conditions simulating seasonal changes, for example, from the lowest temperature of about 59 ° C. in February to the highest temperature of about 72 ° C. in August 1 It can be seen that seasonal changes are simulated by wave-type changes with a repeating cycle of years.

The change range of the test temperature becomes a test condition that can be performed in a weather resistance tester equipped with a cooling device.

Since this method uses a wave-type test temperature change condition that changes in the same manner as the seasonal climate change, the computing device 150 allows the terminal 100 to intuitively understand the simulation of the accelerated test for the seasonal climate change. can provide

In addition, the computing device 150 may provide reference data for standardization of test conditions by using test conditions consistent with a simplified function model of detailed regional and yearly differences in seasonal climate change.

Here, each accelerated test time corresponding to the season change time can be calculated as an accelerated test time by dividing the UV irradiation intensity corresponding to each season by the corresponding UV irradiation amount, and accordingly, to simulate seasonal climate change according to the test time A wave type change model of test conditions is shown in FIG. 12 .

Referring to the accelerated test conditions shown in FIG. 12, in simulating the seasonal climate change in the central region of Korea, the computing device 150 can change the annual temperature only by changing the test condition within the range that can be performed by a conventional weather resistance tester through the correlation principle. A test method can be provided that simulates seasonal climate change up to 25°C.

The winter season with low temperature can be simulated with high UV irradiation intensity and low test temperature, and the summer season with high temperature can be simulated with relatively low UV irradiation intensity and high test temperature.

As described above, the UV irradiation intensity and the test temperature are based on the principle of interdependence, so that a change in one condition is accompanied by a corresponding change in the other condition.

The computing device 150 may calculate the accelerated test condition by applying a wave-type trigonometric function model in which the periodic change according to the annual temperature difference between winter season and summer season is repeated for one year.

The change in the wave shape of the accelerated test conditions according to the change in field time in FIG. 11 was symmetrically expressed by the trigonometric function model in spring and autumn, but when converted to the accelerated test time in FIG. 12, the amount of UV irradiation in spring and autumn It can be seen that the symmetry is lowered as compared to FIG.

Here, it can be seen that the amount of UV irradiation in spring in the central region of Korea is higher than that in autumn, so the slope of change in spring is smaller than that in autumn.

Nevertheless, it can be seen that the change slope of the UV irradiation intensity and the test temperature is the change slope linked by the correlation principle.

The period of seasonal change to be simulated here corresponds to the time of one year in any local climate, but the length of the accelerated test time to simulate it depends on the amount of UV irradiation in the local climate and the intensity of the UV irradiation intensity that simulates it Thus, the cycle time of an accelerated test simulating seasonal changes can mean accelerated over a year.

As an example to simulate seasonal climate change in the central region of Korea, the total accelerated test time for testing the annual climate change in FIG. can represent

Since these test condition changes are gradual and continuous throughout the test time, it cannot be performed by the test condition input method for each cycle used by conventional weather resistance testers.

Hereinafter, in the embodiment of the present invention that simulates seasonal climate change, the ultraviolet irradiation intensity, black panel temperature (BPT), and water injection conditions that meet the cycle conditions of the conventional weather resistance test are defined as a cycle cycle, but different from the conventional weather resistance test. Otherwise, an example of performing with 12-step cycle conditions reflecting seasonal changes will be described.

13 shows the average temperature and precipitation in the central region of Korea for the past 15 years as monthly changes.

It can be seen that there is an annual temperature difference of about 25℃ or more between the lowest value in January and the highest value in August.

In addition, it can be seen that the monthly precipitation change also shows a large change according to the seasonal change, and the rainfall also increases during the summer season when the temperature is high, like other regions showing seasonal climate change.

The seasonal climate change simulation conditions shown in FIG. 14 may be simulated by dividing the seasonal climate change of the central region of Korea in FIG. 13 into monthly changes.

That is, the seasonal climate change for one year can be divided into 12 stages of monthly climate and simulated as an accelerated test condition consisting of gradual but periodic changes according to the seasonality rule.

However, here, a repeated cycle test method similar to the conventional accelerated weathering test method in which one cycle condition is repeated in each step according to the monthly change of 12 steps can be used.

Therefore, as a result, 12 accelerated weathering test cycle conditions divided into 12 are combined to simulate seasonal changes corresponding to 12 months.

At this time, the change in ultraviolet irradiation intensity may be changed only under specific conditions, although fixed conditions are used as in the conventional weather resistance test conditions.

Referring to FIG. 14, an orange bar 1410 represents the black panel temperature (BPT) simulating the monthly climate, and a blue bar 1420 represents the proportion occupied by the water injection cycle during the test cycle time simulating the monthly climate. can indicate

Referring to FIG. 14, it can be seen that the black panel temperature (BPT), which means the test temperature of the accelerated weathering test, is the lowest when February is simulated and the highest when simulated from July to September. In addition, it can be seen that the water spray specific gravity during the test cycle is low when simulating dry spring, and greatly increases when simulating summer, the seasonal rainy season.

As such, the new accelerated weathering test method reflecting the seasonality of the present invention not only simulates the seasonality of temperature and precipitation changes, but also changes in the amount of ultraviolet radiation or solar radiation according to the seasonal change as shown in Table 1 below. It can be simulated by varying the number of iterations of the monthly test cycle to simulate it.

Through this, the computing device 150 may provide a method of simulating seasonal climatic conditions that strongly affect material deterioration in an accelerated weathering test.

Therefore, according to the present invention, seasonal climate change conditions that cannot be achieved with conventional accelerated weathering tests that do not reflect repetitive changes in climate conditions due to annual changes or seasonal changes and repeat constant test cycles are accelerated. Weathering tests may be provided.

Table 1 shows the change of the accelerated weathering test cycle consisting of 196 cycles, for example, to simulate the seasonal climate change of the region. It is presented.

step		wet cycle			dry cycle
division	number of cycles	UV-rays robbery (w/m 2 )	test temperature (℃)	test hour (min)	UV-rays robbery (w/m 2 )	test temperature (℃)	test hour (min)
One	8	40	36	135	120	61	215
2	10	40	31	116	120	57	234
3	14	40	33	103	120	57	247
4	18	40	37	111	120	62	239
5	21	40	41	117	120	67	233
6	24	40	45	173	120	72	177
7	27	40	51	240	106	75	110
8	26	40	53	255	94	75	95
9	19	40	48	189	120	75	161
10	12	40	46	117	120	73	233
11	9	40	43	141	120	70	209
12	7	40	40	117	120	66	233

Each test cycle consists of a dark cycle in which both the lamp and water injection are stopped, a spray cycle in which water injection is performed under a relatively weak UV irradiation intensity of 40 W/m ² , and a strong cycle of 120 W/m ² without water injection. It may consist of a dry cycle tested by UV irradiation.

The total number of test cycles corresponding to one year is 195 cycles, and it can be seen that the number of cycles in the winter season corresponding to January and December, when the amount of insolation and ultraviolet irradiation is relatively low, is the lowest.

Conversely, the summer season between May and September, when solar radiation and ultraviolet radiation are high throughout the year, accounts for 60% of the total number of cycles.

In addition, the test temperature (Black Panel Temperature (BPT)) and the proportion of water injection cycle time between July and September, which correspond to the hot summer season with high precipitation, are designed to be higher than other periods, so that real seasonal changes can be simulated. it can be seen that there is

The number of repetitions of the test cycle means the test time performed to match the UV irradiation amount of the corresponding monthly climate, and can be assigned to the number of test cycles for the corresponding season in the total test time according to the proportion of the UV irradiation amount.

Here, the reason why the number of cycle repetitions per month increases between July and August is that the proportion of water injection in the test cycle corresponding to July and August increases, and the calculation to increase the cycle test time accordingly is reflected. Because.

By performing the black panel temperature (BPT) and water injection cycle ratio in the summer season as high as possible to correspond to reality, the computing device 150 dramatically improves the field simulation of photodegradation of chemical materials that are sensitive to temperature changes and water contact. can improve

Therefore, according to the present invention, by providing a test method that simulates changes in local climatic conditions according to seasonal changes in detail, which was not provided by conventional accelerated weathering test methods, field deterioration given in the outdoor natural environment is realistically reproduced. can do.

In addition, it can be continuously changed according to the test cycle, which means the annual temperature change for one year, or it can be implemented through a step-by-step change divided into several steps. may enhance or mitigate the effect of

Differentiation of monthly test conditions to simulate these seasonal changes can be calculated by simply entering the given monthly climate conditions when using the test condition calculation principle that simulates real climate.

In addition, according to the present invention, touch panel-type panel PCs are installed in most of the recent accelerated weathering test devices to control the test conditions of the device, so that the present invention is difficult without the hassle of the equipment operator to manually input the monthly test conditions. can be performed without

On the other hand, in one embodiment of the present invention, the mutual conversion between the irradiation intensity and the test temperature may be partially used according to the principle of correlation between the ultraviolet irradiation intensity and the test temperature, as in other embodiments.

Referring to Table 1 and FIG. 14, in one embodiment, unlike in other embodiments, a method of changing the test temperature may be used as a method of simulating seasonal climate change.

Since this method intuitively reflects seasonal temperature changes, it can provide easy understanding for the design and operation of test conditions and analysis of test results.

However, as described above, the annual temperature range of many local climates reaches or exceeds 25E, so even under accelerated test conditions reflecting this, a wide test temperature change corresponding to it may be required. Changes in test temperature may cause the temperature control capability of the equipment to deviate or cause thermal deformation and thermal decomposition of chemical materials that are weak to heat.

Referring to FIG. 14, in this example, the test temperatures of the accelerated conditions corresponding to the climatic conditions of July and August of the Republic of Korea reached about 79E and 82E, respectively, and a polymer material having a low heat distortion temperature, especially colored in black Therefore, there is a risk of thermal deformation of the material receiving a lot of radiant heat.

If the accelerated test conditions are defined differently according to the type or color of the material constituting the test piece, it may be undesirable because the application range of the weather resistance test method may be reduced and comparison between materials may be difficult.

Therefore, in one embodiment of the present invention, based on the correlation principle, 75E, which is concerned about thermal deformation, is set as the upper limit of the test temperature for materials with a low thermal deformation temperature, and seasonal climate change is simulated as a change in test temperature, In the test conditions in which the test temperature is 75E or higher, the intensity of UV irradiation may be decreased instead of increasing the test temperature. The results according to this can be seen as shown in Table 1 and FIG. 14 above.

As such, the present invention is a field through a real climate simulation test method in the accelerated weathering test of polyethylene, polypropylene, ABS, PVC, nylon resin, etc., in which the rate and mechanism of photodegradation are affected by temperature and water contact frequency. An effective means for improving degradation reproducibility can be provided. At this time, the present invention can also be used to improve field degradation reproducibility for chemical materials including other plastics in addition to the above-listed plastics, providing an advantage in improving field degradation reproducibility of chemical materials in a wider range than conventional test methods without seasonal simulation. can

According to the present invention described above, in the conventional accelerated weathering test method, the seasonal climate change of the regional climate with annual temperature differences can be accelerated to simulate a real climate.

In addition, as described above, the present invention can simulate seasonal climate change as an accelerated test condition by continuously or stepwise changing the test conditions.

The method of simulating real climate change under the accelerated test conditions of the present invention includes a method of simulating a change in test temperature and a method of simulating a change in ultraviolet irradiation intensity without a change in test temperature replaces the change in test temperature, It is possible to perform accelerated tests where it was impossible to simulate seasonal changes due to constraints.

According to one embodiment of the present invention, even though the test temperature is fixed at a constant temperature in consideration of the characteristics of the local climate to be simulated and the thermal characteristics of the material to be tested, the UV irradiation intensity is simulated under accelerated test conditions according to climate change Alternatively, seasonal climate change can be simulated by standardized cycle-variation methods.

Since the change in cycle of the change cycle of the ultraviolet irradiation intensity essentially simulates the year-by-year cycle that occurs in the natural environment, it simulates the change in the outdoor environment for one year, but by the technical selection of the accelerated test The meaning of the cycle period can be variably selected and designed.

That is, it may be selected to change at a cycle period of once every quarter or, conversely, to change at a cycle period of once every three years.

If the cycle period is shortened, the test condition strongly reflects the seasonal change, and conversely, if the cycle period is long, the test condition reflects the seasonal change weakly.

As a principle method for simulating seasonal changes in the entire climate, away from real climate simulation, periodic changes in test temperature or UV irradiation intensity can be formalized into one change curve pattern and used.

In this standardization method, the amplitude of the change in maximum temperature-minimum temperature or maximum irradiation intensity-minimum irradiation intensity in winter and summer can be standardized as one or selected from amplitude changes of about 2 to 4 steps. Another standardization method can select not only the amplitude of the above test temperature-irradiation intensity change, but also the time length of the change cycle by dividing it into several stages.

Although the length of time that one year means in a real climate is all the same, the amount of solar radiation and ultraviolet irradiation given during one year varies from region to region, and as a result, the degradation rate and amount of degradation of chemical materials occurring in each region may be different.

In order to reflect these differences, it is necessary to classify the test conditions according to the region or climate characteristics to be simulated, but it may also be necessary to classify the amount of ultraviolet radiation or lamp irradiation.

The present invention uses a method of differentiated and tested under accelerated test conditions based on real climate data of the region to be simulated, but in some cases, it is necessary to use standard test conditions according to standardized classification without real climate data.

In this case, it is useful to provide a menu of standardized test conditions in which the described test temperature-irradiation intensity change amplitude is formalized in several steps and the time length of the change cycle is formalized in several steps.

The present invention includes a cycle change method having a periodic change pattern in which these formal seasonal changes are formalized into accelerated test conditions, and a test principle that simulates these as accelerated test conditions based on real climate data and designing test conditions through this An accelerated weathering test device with a built-in program can be implemented.

That is, the seasonal climate change simulation method of the present invention can be performed through a conventional weather resistance test apparatus through a program containing test principle calculation and data.

On the other hand, specific numerical values mentioned in this specification or included in the drawings are only examples, and the present invention is not limited thereto. In other words, the numerical value may also change according to changes in the conditions mentioned in this specification.

Meanwhile, the above-described method can be written as a program that can be executed on a computer, and can be implemented in a general-purpose digital computer that operates the program using a computer-readable medium. In addition, the structure of data used in the above method can be recorded on a computer readable medium through various means. Computer-readable media storing executable computer codes for performing various methods of the present invention include magnetic storage media (eg, ROM, floppy disk, hard disk, etc.), optical readable media (eg, CD-ROM, DVD, etc.).

Those skilled in the art related to the embodiments of the present invention will be able to understand that it can be implemented in a modified form within a range that does not deviate from the essential characteristics of the above description. Therefore, the disclosed methods are to be considered in an illustrative rather than a limiting sense. The scope of the present invention is shown in the claims rather than the detailed description of the invention, and all differences within the equivalent scope should be construed as being included in the scope of the present invention.

The present invention relates to a method, apparatus, and system for providing an accelerated weathering test service, and may be applied to various methods, apparatus, and systems for providing a weathering test service.

Claims (15)

1. Memory; and

   A processor in communication with the memory, the processor comprising:

   Using the interdependence of UV irradiation intensity and temperature on the deterioration of chemical materials for accelerated weathering test, seasonal climate change occurring in the outdoor environment is automatically controlled to be simulated based on the accelerated test condition change in time series,

   Seasonal simulated accelerated weathering test device.
2. According to claim 1,

   the processor,

   In order to simulate the winter season when the temperature is low, increase the light irradiation intensity of the entire lamp including ultraviolet rays or ultraviolet rays,

   In order to simulate the summer season when the temperature is high, the accelerated test conditions are changed to lower the light irradiation intensity of the entire lamp containing ultraviolet rays or ultraviolet rays,

   It is characterized by using the contradictory method of the opposite relationship with the natural phenomenon in which the temperature and solar intensity are proportional,

   Seasonal simulated accelerated weathering test device.
3. According to claim 2,

   the processor,

   Among the accelerated test conditions on the time series, the black panel temperature and the black standard temperature (hereinafter referred to as 'test temperature') are fixed,

   Characterized in that only the light irradiation intensity of the entire lamp containing the ultraviolet rays or ultraviolet rays is controlled to change,

   Seasonal simulated accelerated weathering test device.
4. According to claim 3,

   the processor,

   By lowering the light irradiation intensity of the entire lamp containing the ultraviolet rays or ultraviolet rays step by step, the seasonal change from the winter season to the summer season is simulated, and the light irradiation intensity of the entire lamp containing the ultraviolet rays or ultraviolet rays is raised stepwise to simulate the seasonal change from the summer season to the winter season. Characterized by simulating seasonal changes that change to

   Seasonal simulated accelerated weathering test device.
5. According to claim 1,

   the processor,

   To simulate the winter season with low temperature, the test temperature is lowered, and to simulate the summer season with high temperature, the test temperature is increased.

   If it is determined that the summer simulated test temperature causes physical thermal deformation or chemical thermal decomposition of the chemical material to be tested, and it is difficult to simulate aging deterioration in an outdoor environment, for seasonal simulation of the test temperature below the thermal deformation or thermal decomposition temperature Characterized in that the upper limit of variation is set and the UV irradiation intensity is controlled to be lowered to correspond to the test temperature.

   Seasonal simulated accelerated weathering test device.
6. According to claim 4 or 5,

   the processor,

   The light irradiation intensity or / and unit control the test temperature,

   Characterized in that the seasonal change from the winter season to the summer season and the seasonal change from the summer season to the winter season are designed to change symmetrically,

   Seasonal simulated accelerated weathering test device.
7. According to claim 4 or 5,

   the processor,

   A waveform model based on a trigonometric function is expressed as an annual cycle change to simulate seasonal climate change due to the light irradiation intensity and test temperature change,

   Characterized in that it is expressed as a continuous change in the form of a function without step division,

   Seasonal simulated accelerated weathering test device.
8. According to claim 1,

   the processor,

   In order to simulate the seasonal change from winter to summer, the light irradiation intensity of UV light or the entire lamp containing UV is gradually lowered, the test temperature is correspondingly increased,

   In order to simulate the seasonal change from summer to winter, the light irradiation intensity of the entire lamp containing UV light or ultraviolet rays is increased step by step, and the test temperature is controlled to be lowered step by step in response.

   Characterized in that it is expressed as an annual cycle change as a waveform model by trigonometric function and expressed as a continuous change in the form of a function without step division,

   Seasonal simulated accelerated weathering test device.
9. According to claim 6,

   the processor,

   The light irradiation intensity or / and unit control the test temperature,

   Characterized in that each step is controlled to be designed under accelerated test conditions according to the seasonal ratio of the actual season's ultraviolet radiation or solar radiation in the area to be simulated based on the ultraviolet radiation or solar radiation of the season to be simulated,

   Seasonal simulated accelerated weathering test device.
10. According to claim 2 or 5,

    the processor,

    Characterized in that the control to reduce the water contact time in relation to the winter season simulation and increase the water contact time in relation to the summer season simulation,

    Seasonal simulated accelerated weathering test device.
11. According to claim 1,

    the processor,

    To use a xenon-arc light source, a luminescent plasma light source, a metal-halide light source, an ultraviolet-fluorescent light source, or a mixed light source that includes one of these light sources having mimicry of the solar ultraviolet light power spectrum in a predefined ultraviolet wavelength range. characterized by controlling

    Seasonal simulated accelerated weathering test device.
12. According to claim 1,

    the processor,

    Collect and store seasonal climate change data for predefined regions,

    Characterized in that, when a request for an accelerated weathering test for a specific region is received from the terminal, the stored seasonal climate change data of the corresponding region is extracted and controlled to be used as an accelerated test test condition for simulating seasonal change.

    Seasonal simulated accelerated weathering test device.
13. According to claim 2 or 5,

    the processor,

    Control to reduce the water contact time in relation to the winter season simulation and increase the water contact time in relation to the summer season simulation,

    The water contact test performed during the water contact cycle is one of water spraying by fine water spray nozzles, water film formation by waterfall or fountain nozzles, spraying by ultrasonic vibration, high humidity control by heating, and underwater treatment by immersion. Control to be performed based on at least one method,

    A heating and cooling device is attached to the water supply device so that the temperature of the water performed during the water contact cycle can be controlled to a water temperature that meets the test conditions of the season to be simulated, so that the water temperature suitable for seasonal simulation can be adjusted Characterized in that,

    Seasonal simulated accelerated weathering test device.
14. In the seasonal simulated accelerated weathering test method,

    receiving an accelerated weathering test request through a terminal; and

    Including performing the requested accelerated weathering test,

    The accelerated weathering test is automatically controlled so that seasonal climate changes occurring in the outdoor environment are simulated based on changes in accelerated test conditions on a time series by using the interdependence of ultraviolet irradiation intensity and temperature on the deterioration of chemical materials.

    Seasonal simulated accelerated weathering test method.
15. In the seasonal simulated accelerated weathering test system,

    a terminal requesting the accelerated weathering test and inputting various data; and

    Comprising a computing device that performs the requested accelerated weathering test;

    The computing device,

    For the accelerated weathering test, seasonal climate change occurring in the outdoor environment is simulated based on the accelerated test condition change in the time series by using the interdependence of the UV irradiation intensity and temperature on the deterioration of chemical materials. A processor that automatically controls ,

    Seasonal simulated accelerated weathering test system.

Images