JP2016161559A - Calculation method for ultraviolet transmission quantity and calculation method for deterioration rate of strength of laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a calculation method for an ultraviolet transmission quantity that properly recognizes a state of the strength of a laminate and a calculation method for a deterioration rate of the strength of the laminate.SOLUTION: A calculation method for an ultraviolet transmission quantity of a resin in a laminate having a base material and a resin laminated on the surface of the base material and irradiated with external light includes: a luminosity acquisition step of acquiring information on luminosity of the resin (gel coat part); a film thickness information acquisition step of acquiring information on a film thickness of the resin (gel coat part); a luminosity ultraviolet relation term acquisition step of acquiring a luminosity ultraviolet relation term showing a relation between the film thickness and the luminosity of the resin (gel coat part); and an ultraviolet transmission quantity calculation step of calculating an ultraviolet transmission quantity of the resin (gel coat part) based on the information on the luminosity of the resin (gel coat part), the information on the film thickness of the resin (gel coat part), and the luminosity ultraviolet relation term.SELECTED DRAWING: Figure 17

Description

  The present invention includes a base material and a resin laminated on the surface of the base material, and a method for calculating the amount of ultraviolet rays transmitted through the resin and a method for calculating the strength deterioration rate of the laminate in a laminate to which external light is irradiated About.

  For example, an antenna such as a parabona antenna is provided with a radome (radar dome) made of a dielectric that transmits radio waves. The radome protects the reflector of the antenna. The radome is generally formed of GFRP (Glass Fiber Reinforced Plastic). For example, Patent Document 1 describes a radome made of GFRP and a porous member.

  One of the causes of deterioration of the radome strength is deterioration of GFRP due to ultraviolet rays. Some radomes are formed by laminating a resin such as a gel coat on the surface of the GFRP in order to suppress the degradation of the GFRP and the strength of the radome. As described above, some laminated bodies such as radomes are formed by laminating a resin such as a gel coat on GFRP which is a base material to suppress ultraviolet deterioration of the base material.

JP 2012-109657 A

  The gel coat laminated to suppress deterioration due to ultraviolet rays is worn and weathered by ultraviolet rays, and the film thickness gradually decreases. For this reason, unless maintenance is performed, the gel coat eventually disappears from the surface of the GFRP. When the gel coat disappears, the GFRP is directly irradiated with ultraviolet rays, and the GFRP deteriorates. Here, it is confirmed by visual observation whether the gel coat has disappeared. If the gel coat has disappeared, a repair coating process can be performed.

  Since antennas such as a parabola antenna are installed outdoors for a long period of time, it is required to know the state of strength deterioration over time of members constituting the antenna. As described above, one of the causes of deterioration of the radome strength is GFRP ultraviolet deterioration. Therefore, knowing the amount of UV irradiation to GFRP is important for recognizing the state of radome strength degradation.

  The gel coat suppresses the amount of ultraviolet irradiation to the GFRP, but some ultraviolet rays are transmitted and reach the GFRP. In particular, if the film thickness of the gel coat is reduced, the amount of ultraviolet light transmitted increases, and the amount of ultraviolet light applied to the GFRP may increase. Therefore, even if repair coating is applied after the gel coat has disappeared as in the prior art, the GFRP is already irradiated with ultraviolet rays, and the strength of the radome may be reduced. In this case, it is difficult to know the amount of ultraviolet irradiation to the GFRP and the strength state of the radome.

  Here, in order to solve the above-mentioned problem, the present invention includes a base material and a resin laminated on the surface of the base material, and a method for calculating the amount of ultraviolet light transmitted through the resin in a laminate that is irradiated with external light And a method for calculating the strength deterioration rate of the laminate, and a method for calculating the amount of UV transmission of the resin that can appropriately recognize the strength state of the laminate, and a method for calculating the strength deterioration rate of the laminate. The purpose is to provide.

  In order to solve the above-described problems and achieve the object, the method for calculating the amount of ultraviolet light transmitted through the resin of the present invention includes a base material and a resin laminated on the surface of the base material, and is irradiated with external light. In the laminate, a method for calculating the amount of ultraviolet light transmitted through the resin, the lightness obtaining step for obtaining lightness information of the resin, the film thickness information obtaining step for obtaining information on the film thickness of the resin, and the resin Brightness ultraviolet relation term obtaining step for obtaining a brightness ultraviolet relation term indicating a relation between the amount of ultraviolet transmission and the film thickness and brightness of the resin, information on the lightness of the resin, and information on the film thickness of the resin, An ultraviolet transmission amount calculating step of calculating an ultraviolet transmission amount of the resin based on the lightness ultraviolet ray related term.

  In the method of calculating the amount of ultraviolet light transmitted through the resin, the step of calculating the amount of transmitted ultraviolet light includes determining the lightness of the resin over time based on the information on the lightness of the resin, the film thickness of the resin over time, and the lightness ultraviolet light related term. Preferably, the method includes a step of calculating an ultraviolet transmission amount for each resin and a step of calculating an integrated amount of the ultraviolet transmission amount of the resin by summing the ultraviolet transmission amounts of the resin over time.

  In the method for calculating the amount of ultraviolet light transmitted through the resin, the film thickness information acquiring step includes a step of acquiring information on the film thickness of the resin at the time of lamination, and a film indicating a relationship between the lightness of the resin and a film thickness reduction rate. Film thickness reduction rate for calculating the film thickness reduction rate of the resin based on the information on the lightness of the resin and the film thickness reduction rate calculation term It is preferable to include a calculation step and a step of calculating the resin film thickness over time based on the resin film thickness and the film thickness reduction rate during lamination.

  In the method of calculating the amount of ultraviolet light transmitted through the resin, the film thickness reduction rate calculation term is preferably such that the film thickness reduction rate decreases as the lightness of the resin increases.

  In the method for calculating the ultraviolet ray transmission amount of the resin, the lightness ultraviolet ray related term obtaining step obtains a lightness pigment related term indicating a relation between the lightness of the resin and the content of the pigment contained in the resin, Based on the step of obtaining a pigment ultraviolet ray relation term indicating the relationship between the pigment content and the resin film thickness and the ultraviolet ray transmission amount, the lightness pigment relation term and the pigment ultraviolet ray relation term, Preferably, the step of calculating

  In the method for calculating the amount of ultraviolet light transmitted through the resin, it is preferable that the term relating to lightness ultraviolet rays is such that the amount of ultraviolet light transmitted decreases as the lightness of the resin increases.

  In the method for calculating the amount of ultraviolet light transmitted through the resin, it is preferable that the brightness ultraviolet light related term is such that the amount of ultraviolet light transmitted decreases as the film thickness of the resin increases.

  In the method for calculating the amount of ultraviolet light transmitted through the resin, the laminate is preferably a radome provided in a parabona antenna.

  In order to solve the above-described problems and achieve the object, the method of calculating the strength deterioration rate of the laminate of the present invention includes a base material and a resin laminated on the surface of the base material, and is irradiated with external light. In the laminate to be obtained, a method for calculating a strength deterioration rate of the laminate, the step of obtaining a reference strength rate indicating a relationship between an ultraviolet irradiation amount to the base material and a strength deterioration rate of the base material And calculating the ultraviolet ray transmission amount of the resin by the method, and calculating the strength deterioration rate of the laminate based on the reference intensity rate and the ultraviolet ray transmission amount of the resin.

  In the method for calculating the strength deterioration rate of the laminate, the laminate is preferably a radome provided in a parabona antenna.

  According to the present invention, the strength state of the laminate can be properly recognized.

FIG. 1 is a schematic diagram illustrating a configuration of a parabona antenna unit according to the present embodiment. FIG. 2 is a partial cross-sectional view of the parabona antenna portion. FIG. 3 is a cross-sectional view of the main part of the radome portion of the present embodiment. FIG. 4 is a detailed cross-sectional view of the GFRP portion according to the present embodiment. FIG. 5 is a graph showing terms for calculating the film thickness reduction rate. FIG. 6 is a graph showing an example of a reflectance film thickness relation term in the present embodiment. FIG. 7 is a graph showing the relationship between brightness and reflectance. FIG. 8 is a flowchart showing the steps of the method for acquiring film thickness information of the gel coat portion. FIG. 9 is a graph showing an example of the intensity of transmitted infrared light when infrared spectroscopy is applied to the UV test gel coat. FIG. 10 is a graph showing the amount of reduction in the infrared peak area for each surface depth of the UV test gel coat. FIG. 11 is a graph showing an example of terms related to film thickness ultraviolet rays. FIG. 12 is a graph showing an example of a pigment ultraviolet ray related term. FIG. 13 is a flowchart showing steps of a method for calculating a pigment ultraviolet ray related term. FIG. 14 is a graph showing an example of a light pigment related term. FIG. 15 is a graph showing an example of terms related to lightness ultraviolet rays. FIG. 16 is a flowchart showing the steps of a method for calculating a brightness ultraviolet ray related term. FIG. 17 is a flowchart showing the steps of the method for calculating the amount of ultraviolet light transmitted through the gel coat portion. FIG. 18 is a flowchart showing the steps of a method for calculating the strength deterioration rate of the radome.

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

(Configuration of parabona antenna)
FIG. 1 is a schematic diagram illustrating a configuration of a parabona antenna unit according to the present embodiment. As shown in FIG. 1, the parabona antenna unit 1 according to this embodiment includes a support column 10, a connection unit 12, and a parabona antenna unit 20. In the parabona antenna unit 1, the parabona antenna unit 20 is attached to the support column 10 via the connection part 12 by attaching the fixing part 21 of the parabona antenna part 20 to the connection part 12.

  The support column 10 is a columnar member that points to the parabona antenna unit 20, and in the present embodiment, extends in the vertical direction with respect to the ground surface Gr. The connection portion 12 is attached to the support column 10 and connects the parabona antenna unit 20 and the support column 10. The connection unit 12 attaches the parabona antenna unit 20 to the support column 10 at a predetermined installation inclination angle θ0. More specifically, the installation inclination angle θ0 is an inclination angle between the central axis X1 of the parabona antenna portion 20 and the central axis X2 of the support column portion 10. In the present embodiment, the installation inclination angle θ0 is 90 degrees, but is not limited thereto. Moreover, the connection part 12 may be capable of changing the installation inclination angle θ0. As long as the parabona antenna unit 20 is installed at a predetermined installation inclination angle θ0, the parabona antenna unit 20 may not be installed by the support column unit 10 and the connection unit 12 as described above, and the configuration of installation is arbitrary. is there.

  FIG. 2 is a partial cross-sectional view of the parabona antenna portion. As shown in FIG. 2, the parabona antenna unit 20 includes a main reflecting mirror unit 22, a primary radiator 26, a sub reflecting mirror unit 27, a sub reflecting mirror holding unit 28, and a radome unit 30. In the parabola antenna unit 20, the sub-reflecting mirror unit 27 reflects the radio wave derived from the primary radiator 26 toward the main reflecting mirror unit 22, and the main reflecting mirror unit 22 reflects the reflected radio wave. This is a Cassegrain-type parabona antenna for communication. Since the parabola antenna unit 20 is installed outdoors for communication, external light is irradiated. The parabona antenna unit 20 is not limited to the Cassegrain type, and may be a parabona antenna that does not have the sub-reflecting mirror unit 27, for example.

  The main reflector 22 is a mirror surface in which the inner surface 23 forms a paraboloid of revolution, and is a concave reflector. Since the inner surface 23 is a paraboloid, it has a focal point 24 formed by the paraboloid. The central axis X1 is the central axis of the main reflector 22. The primary radiator 26 is a device that radiates radio waves, and is provided on the inner surface 23 side of the main reflecting mirror portion 22 so that the tip is disposed at the focal point 24. The sub-reflecting mirror unit 27 is disposed inside the primary radiator 26 and at the tip of the primary radiator 26, that is, the focal point 24. The sub-reflecting mirror unit 27 is a convex reflecting mirror having a convex mirror surface toward the inner surface 23 of the main reflecting mirror unit 22.

  The primary radiator 26 emits radio waves along the central axis X <b> 1 toward the focal point 24. The radio wave radiated to the primary radiator is reflected by the sub-reflecting mirror unit 27 disposed at the focal point 24 and travels toward the inner surface 23 of the main reflecting mirror unit 22. The radio wave reflected by the sub-reflecting mirror part 27 is reflected by the inner surface 23 of the main reflecting mirror part 22 as a radio wave along the central axis X1. In addition, the parabona antenna part 20 is a large thing (the diameter of the main reflection mirror part 22 is several meters or more) used for microwave radio communication etc., for example.

  As shown in FIGS. 1 and 2, the radome portion 30 has a hollow conical shape inside and is open at the bottom. In addition, the radome 30 has a spherical shape at the apex 30a. As shown in FIG. 1, the radome part 30 is attached to the main reflecting mirror part 22 so that the central axis of the cone coincides with the central axis X1 of the parabona antenna part 20. The radome 30 is a radar dome that covers and protects the inner surface 23 of the main reflector 22, the primary radiator 26, and the sub reflector 27. Here, as shown in FIG. 2, a bus line connecting a point 30b that is a point in the vertical direction on the outer periphery of the bottom surface of the conical shape of the radome portion 30 and the vertex 30a is a bus line X3. The angle between the central axis X1 and the bus line X3 is defined as an inclination angle θ1. The radome installation inclination angle θ2 (the radome installation inclination angle θ2 that is the angle at which the radome section 30 is installed), which is the installation inclination angle with respect to the ground surface Gr of the upper surface in the vertical direction of the radome section 30, is the vertical extension of the column section 10. Therefore, it is expressed by the following formula (1).

  θ2 = θ1− (90 ° −θ0) (1)

  In the present embodiment, the inclination angle θ1 is 60 degrees, and the installation inclination angle θ0 is 90 degrees. Therefore, the radome installation inclination angle θ2 is 60 degrees, similar to the inclination angle θ1. The inclination angle θ1 is not limited to 60 degrees.

  FIG. 3 is a cross-sectional view of the main part of the radome portion of the present embodiment. As shown in FIG. 3, the radome part 30 includes a gel coat part 32, a GFRP part 34, a porous layer part 35, a GFRP part 36, and a top coat part 38 that are laminated in this order from the surface 31. As shown in FIG. 2, the surface 31 is an outer surface of the radome portion 30, and is a surface opposite to the surface covering the inner surface 23 of the main reflecting mirror portion 22. In other words, the surface 31 is a surface to which external light is irradiated. That is, the radome part 30 is a laminated body irradiated with external light, and a gel coat part 32 as a resin is laminated on the outer surfaces of the GFRP part 34, the porous layer part 35 and the GFRP part 36 forming the base material 37. The top coat portion 38 is laminated on the inner surface of the base material 37.

  The gel coat portion 32 is a resin, and is laminated on the outer surface of the base material 37 to protect the base material 37 from, for example, ultraviolet rays. The film thickness of the gel coat part 32 is, for example, 100 μm or more and 500 μm or less. The gel coat part 32 contains a pigment Pig. In addition, a pigment here is a powder insoluble in water and oil. The color of the gel coat part 32 varies depending on the component and content of the pigment. The color here is a concept including the three attributes of color, hue, saturation, and brightness. Therefore, the difference in color means that at least one of hue, saturation, and brightness is different. In the present embodiment, the pigment Pig contained in the gel coat portion 32 is titanium oxide. When the content of titanium oxide as the pigment Pig is different, the gel coat portion 32 has different brightness. In the radome of the parabona antenna that is actually installed, the content of titanium oxide as a pigment is arbitrarily set. Therefore, the rabons of the parabona antennas that are actually installed have different brightness values. The pigment contained in the gel coat portion 32 is not limited to titanium oxide, and may be any material. Further, the gel coat part 32 is not limited to the above-described components as long as it is a resin, and the film thickness may be arbitrary. The top coat portion 38 is a resin having the same component as the gel coat portion 32, and the film thickness is the same as that of the gel coat portion 32. However, the top coat portion 38 is not limited to this, and if it is laminated on the inner surface of the base material 37, The components and film thickness are arbitrary.

  FIG. 4 is a detailed cross-sectional view of the GFRP portion according to the present embodiment. The GFRP section 34 is, for example, GFRP (Glass Fiber Reinforced Plastic), and is made of a composite material in which glass fibers and plastic (resin) are laminated. The GFRP part 34 improves the strength of the radome part 30. As shown in FIG. 4, the GFRP section 34 includes, for example, a plastic section 41, a glass fiber section 42, a plastic section 43, a glass fiber section 44, a plastic section 45, a glass fiber section 46, and a plastic section 47 in this order. Has been. The porous layer portion 35 is, for example, porous urethane (foamed urethane). Since the GFPR unit 36 has the same configuration as the GFRP unit 34, description thereof is omitted.

(About deterioration of radome strength)
A parabona antenna is generally placed outdoors for a long period of time such as several decades. The radome part 30 protects the main reflecting mirror part 22 and the like, and needs to be replaced or repaired when the strength deteriorates. Therefore, it is important to know the deterioration state of the strength of the radome in the parabona antenna. Here, the strength of the radome part 30 is improved by the GFRP parts 34 and 36. In other words, the strength deterioration degree of the radome 30 corresponds to the strength deterioration degree of the GFRP portions 34 and 36.

  The parabola antenna unit 20 is disposed outdoors for a long period of time as described above. Therefore, the parabona antenna unit 20 is irradiated with external light for a long period of time. Here, the strength of the GFRP unit 34 is deteriorated by the ultraviolet rays that the external light has. The gel coat part 32 is laminated on the surface of the GFRP part 34 and has a role of protecting from ultraviolet rays. However, the gel coat part 32 may transmit a part of the irradiated ultraviolet rays to the internal GFRP 34 depending on the thickness of the layer. The amount of transmitted ultraviolet light varies depending on the conditions of the gel coat portion 32. Therefore, in order to know the degree of deterioration of the strength of the radome 30, it is important to know the amount of ultraviolet rays irradiated to the GFRP portion 34, that is, the amount of ultraviolet rays that the gel coat portion 32 transmits.

(About film thickness information acquisition method of gel coat part)
The amount of ultraviolet light that is transmitted through the gel coat part 32 varies depending on the film thickness of the gel coat part 32. In the present embodiment, information on the film thickness of the gel coat part 32 is acquired in order to calculate the amount of ultraviolet rays that the gel coat part 32 transmits. The gel coat portion 32 protects the GFRP 34 from ultraviolet rays, but the gel coat portion 32 itself is worn and weathered by the ultraviolet rays and the film thickness gradually decreases. Therefore, in this embodiment, in order to acquire information on the film thickness of the gel coat portion 32, the film thickness reduction rate of the gel coat portion 32 is calculated, and the gel coat portion 32 for each unit time is calculated based on the film thickness reduction rate of the gel coat portion 32. The film thickness is calculated. The film thickness reduction rate of the gel coat part 32 indicates the amount of film thickness reduction of the gel coat part 32 per unit time after the gel coat part 32 is irradiated with external light (after being placed outdoors). . In this embodiment, the film thickness reduction rate of the gel coat portion 32 is the amount of film thickness reduction of the gel coat portion 32 per year, and the unit is μm / year.

  Initially, the calculation method of the film thickness reduction rate of the gel coat part 32 is demonstrated. When calculating the film thickness reduction rate of the gel coat part 32, information on the brightness of the gel coat part 32 is acquired. Information on the lightness of the gel coat part 32 is obtained by measuring the lightness of the gel coat part 32 of the target parabona antenna unit 1 with a colorimeter. However, the lightness information of the gel coat part 32 may be data measured at the time of lamination, for example, or may be calculated from the pigment content without performing the measurement.

  The calculation method of the film thickness reduction rate of the gel coat part 32 then acquires the film thickness reduction rate calculation term. The term for calculating the film thickness reduction rate is a relational expression showing the relationship between the brightness of the film and the film thickness reduction rate. FIG. 5 is a graph showing terms for calculating the film thickness reduction rate. The horizontal axis in FIG. 5 is Munsell brightness, and the vertical axis is the film thickness reduction rate (μm / year). A curve A1 in FIG. 5 is a curve showing an example of a film thickness reduction rate calculation term. As shown by the curve A1, the film thickness reduction rate calculation term is such that the film thickness reduction rate decreases as the film brightness increases. More specifically, in the film thickness reduction rate calculation term, the amount of decrease in the film thickness reduction rate (the slope of the curve A1) increases as the film brightness increases. The term for calculating the film thickness reduction rate is not limited to that shown in the curve A1 as long as the film brightness increases, so that the film thickness reduction rate decreases.

  More specifically, the film thickness reduction rate calculation term in the present embodiment is calculated based on the reflectance film thickness relationship term which is the relationship between the film reflectance and the film thickness reduction rate. Here, the reflectance is the reflectance of visible light, but may be the reflectance of ultraviolet rays, for example. More specifically, the reflectance film thickness relationship term is expressed by the following equation (2).

  y1 = Ax1 + B (2)

  Here, x1 is the reflectance of the film, and y1 is the film thickness reduction rate. A is a negative predetermined coefficient, and B is a predetermined coefficient. The reflectance film thickness relationship term is a value in which the film thickness reduction rate becomes smaller as the reflectance increases. Since the gel coat disappears due to absorption of ultraviolet rays, as the reflectivity increases, the amount of absorbed ultraviolet rays decreases and the film thickness reduction rate decreases. It should be noted that the reflectance film thickness relationship term is not limited to the expression shown in Expression (2) as long as the film thickness decreasing rate decreases as the reflectance increases, and may be a quadratic expression, for example. Good.

  In the present embodiment, the reflectance film thickness relationship term is specifically calculated based on the test result of the exposure test. Hereinafter, an example of the conditions and results of the exposure test will be described. Since the following is an example of the exposure test in the present embodiment, conditions and results are not limited to those described below. The exposure test is preferably an outdoor exposure test carried out based on JISZ2831. The exposure test described below is a test in which the exposure test gel coat 101 and the exposure test gel coat 102 are used as samples and exposed to the outdoors. The gel coats 101 and 102 for the exposure test have a color different from that of the gel coat part 32 due to the difference in pigment components and content. The color of the exposure test gel coat 101 is white, and the color of the exposure test gel coat 102 is blue. In the exposure test, the test surfaces of the exposure test gel coats 101 and 102 are inclined by θ3 degrees with respect to the ground surface Gr. That is, an exposure test installation inclination angle, which is an angle at which the exposure test gel coats 101 and 102 are installed, is set to θ3 degrees.

  The exposure test is performed under the above conditions, and the reflectance film thickness relationship term is calculated based on the amount of film thickness reduction on the test surface of the gel coat 101, 102 for exposure test after elapse of T years under the exposure test. Table 1 is a table showing an example of the result of the exposure test. Table 1 below shows the film thickness reduction amount (μm) after T years on the test surfaces of the gel coats 101 and 102 for exposure test and the film thickness reduction rate (μm / year).

As shown in Table 1, the amount of decrease in film thickness on the test surface of the gel coat 101 for exposure test after elapse of T years under the exposure test is R ₁₀₁ (μm). Further, the amount of decrease in film thickness on the test surface of the gel coat 102 for exposure test after the elapse of T years under the exposure test is R ₁₀₂ (μm). In this case, the film thickness decreasing rate of the exposure test gel coat 101 is R ₁₀₁ / T (μm / year), and the film thickness decreasing rate of the exposure test gel coat 102 is R ₁₀₂ / T (μm / year). is there.

  In the present embodiment, the reflectance film thickness relationship term is calculated based on the relationship between the film thickness decreasing speed and color of the exposure test gel coat 101 and the film thickness decreasing speed and color of the exposure test gel coat 102. More specifically, the reflectance film thickness relationship term is calculated based on the relationship between the film thickness reduction rate and the reflectance of the exposure test gel coat 101 and the relationship between the film thickness decrease rate and the reflectance of the exposure test gel coat 102. Is.

FIG. 6 is a graph showing an example of a reflectance film thickness relation term in the present embodiment. The horizontal axis in FIG. 6 is the reflectance (μm / year), and the vertical axis is the film thickness reduction rate (%). As shown in FIG. 6, the reflectance of white, which is the color of the gel coat for exposure test 101, is 75%, and the reflectance of blue, which is the color of the gel coat for exposure test 102, is 20%. Here, as an example, the film thickness decreasing rate of the exposure test gel coat 101 is 2 μm / year, and the film thickness decreasing rate of the exposure test gel coat 102 is 3 μm / year. In this case, the film thickness decreasing rate in white (reflectance 75%) is 2 μm / year of the film thickness decreasing rate of the gel coat 101 for exposure test (point P _{101 in} FIG. 6), and the film in blue (reflectance 20%). The thickness reduction rate is 3 μm / year (point P _{102 in} FIG. 6) of the film thickness reduction rate of the gel coat 102 for the exposure test. If a straight line connecting the point P ₁₀₁ and the point P ₁₀₂ is a straight line A2, the straight line A2 is a straight line indicating the relationship between the reflectance of the film and the film thickness reduction rate. In the present embodiment, a relational expression representing this straight line A2 is acquired as a reflectance film thickness relation term.

  As described above, the reflectance film thickness relationship term is calculated based on the film thickness reduction amount of the exposure test gel coats 101 and 102 after the exposure test. However, the reflectance film thickness relationship term may be obtained from a predetermined relational expression indicating the relationship between the reflectance of the film and the film thickness reduction rate, and may not be calculated by such an exposure test. Good. That is, the film thickness information acquisition method of the gel coat portion 32 may be any method in which the film thickness reduction rate calculation term is the above-described formula (1).

  Here, the brightness has a correlation with the reflectance of light, and the reflectance increases as the brightness increases. FIG. 7 is a graph showing the relationship between brightness and reflectance. A curve A3 in FIG. 7 shows the relationship between Munsell brightness and reflectance as an example of the relationship between brightness and reflectance. In the present embodiment, the reflectance in the relationship between the reflectance calculated by the exposure test and the film thickness reduction rate is replaced with the lightness, and the film thickness reduction rate calculation term indicating the relationship between the lightness and the film thickness reduction speed is calculated. To do. That is, the film thickness reduction rate calculation term shown in FIG. 5 is calculated based on the relationship between the brightness and the reflectance shown in FIG. 7 and the reflectance thickness relationship term shown in FIG. However, the film thickness reduction rate calculation term is not limited to being calculated based on the relationship between the brightness and the reflectance and the reflectance film thickness relationship term. The term for calculating the film thickness reduction rate may be calculated by calculating the lightness of the gel coats 101 and 102 for the exposure test and replacing the result of the above-described exposure test with the relationship between the lightness and the amount of film thickness reduction.

  The method for calculating the film thickness reduction rate of the gel coat part 32 is based on the film thickness reduction rate calculation term of the gel coat part 32 calculated as described above and the detected value of the brightness of the gel coat part 32. Calculate the rate of decrease. Further, the film thickness reduction rate calculation method of the gel coat part 32 calculates the corrected film thickness reduction rate by correcting the value of the film thickness reduction rate based on the angle correction term as follows. The method of calculating the film thickness reduction rate of the gel coat part 32 assumes that the film thickness reduction speed of the gel coat part 32 changes based on the angle between the radome part 30 and the external light, and sets the value of the film thickness reduction rate of the gel coat part 32 to an angle. Correction is performed using the correction term, and the corrected film thickness reduction rate is calculated. The angle correction term is a correction term obtained based on the installation inclination angle θ1 of the parabona antenna unit 20. More specifically, the angle correction term includes an installation inclination angle θ2 with respect to the ground surface Gr on the upper surface in the vertical direction of the radome portion 30 and an exposure test installation inclination angle θ3 that is an angle at which the exposure test gel coats 101 and 102 were installed. Is the ratio. Specifically, when the angle correction term is Deg, the angle correction term Deg is calculated by the following equation (3).

  Deg = (1 + cos θ2) / (1 + cos θ3) (3)

  The method for calculating the film thickness reduction rate of the gel coat part 32 acquires an angle correction term, and calculates the correction film thickness reduction rate of the gel coat part 32 from the film thickness reduction rate of the gel coat part 32 and the angle correction term. Specifically, the method for calculating the film thickness reduction rate of the gel coat portion 32 is as follows when the film thickness reduction rate of the gel coat portion 32 is V1, and the corrected film thickness reduction rate of the gel coat portion 32 is V2. As described above, the corrected film thickness reduction rate V2 of the gel coat portion 32 is calculated.

  V2 = V1 · Deg (4)

  In the film thickness information acquisition method of the gel coat portion 32, based on the corrected film thickness reduction rate of the gel coat portion 32 calculated in this way and the value of the film thickness of the gel coat portion 32 at the time of stacking on the base material 37, unit time. By calculating the value of the film thickness of the gel coat part 32 (every time), information on the film thickness of the gel coat part 32 is acquired. Specifically, the film thickness information acquisition method of the gel coat part 32 is obtained by subtracting the product of the corrected film thickness reduction rate of the gel coat part 32 and the number of years from the value of the film thickness of the gel coat part 32 at the time of lamination. The value of the film thickness of the gel coat portion 32 (each year) is calculated. In addition, the value of the film thickness of the gel coat part 32 at the time of lamination | stacking may acquire the setting value (design value) of the film thickness of the gel coat part 32 at the time of lamination | stacking processing, You may acquire the film thickness value of the gel coat part 32 at the time.

  The process of the film thickness information acquisition method of the gel coat part 32 demonstrated above is demonstrated based on a flowchart. FIG. 8 is a flowchart showing the steps of the method for acquiring film thickness information of the gel coat portion. As shown in FIG. 8, the film thickness information acquisition method of the gel coat part 32 first acquires information on the lightness of the gel coat part 32 (step S10). The thickness information acquisition method of the gel coat part 32 acquires the value of brightness by measuring the brightness with a colorimeter for the gel coat part 32 of the target parabona antenna unit 1.

  After acquiring the brightness information of the gel coat part 32, the film thickness information acquisition method of the gel coat part 32 acquires the film thickness reduction rate calculation term (step S12). The film thickness reduction rate calculation term is calculated based on the relationship between the brightness and the reflectance shown in FIG. 7 and the reflectance film thickness relationship term shown in FIG. In addition, step S12 may be performed before step S10 and may be performed simultaneously.

  After acquiring the film thickness reduction rate calculation term, the film thickness information acquisition method of the gel coat portion 32 calculates the film thickness reduction rate of the gel coat portion 32 based on the brightness value of the gel coat portion 32 and the film thickness reduction rate calculation term. (Step S14). After calculating the film thickness reduction rate of the gel coat part 32, the film thickness information acquisition method of the gel coat part 32 acquires an angle correction term (step S15), and the gel coat part 32 is based on the film thickness reduction rate and the angle correction term. The corrected film thickness reduction rate is calculated (step S16).

  Moreover, the film thickness information acquisition method of the gel coat part 32 acquires the information (film thickness value) of the film thickness of the gel coat part 32 at the time of lamination (step S18). The film thickness information acquisition method of the gel coat part 32 calculates the film thickness of the gel coat part 32 per unit time based on the corrected film thickness reduction rate of the gel coat part 32 and the film thickness information of the gel coat part 32 at the time of lamination (step). S19). When step S19 ends, the film thickness information acquisition method for the gel coat portion 32 ends. Note that step S18 may be performed either before or after step S10 to step S16, or may be performed at the same time. Moreover, the film thickness information acquisition method of the gel coat part 32 is not corrected by the angle correction term, and the gel coat for each unit time is based on the information on the film thickness reduction rate of the gel coat part 32 and the film thickness of the gel coat part 32 at the time of lamination. The film thickness of the portion 32 may be calculated.

(Regarding the method of obtaining brightness ultraviolet rays)
The amount of ultraviolet rays that the gel coat part 32 transmits changes according to the brightness and the film thickness of the gel coat part 32. Hereinafter, a method for obtaining a lightness ultraviolet ray related term indicating the relationship between the amount of ultraviolet light transmitted through the gel coat part 32 and the lightness and film thickness of the gel coat part 32 will be described.

  Initially, the film thickness ultraviolet ray relation term which shows the relationship between the film thickness of the gel coat part 32 and the ultraviolet-ray transmission amount of the gel coat part 32 in unit time is demonstrated. More specifically, the term relating to the film thickness ultraviolet ray is a relationship between the film thickness of the gel coat and the ultraviolet ray transmission amount of the gel coat per unit time when the content of the pigment Pig in the gel coat part 32 is a predetermined value. The term relating to the film thickness ultraviolet ray is such that the amount of transmitted ultraviolet light increases as the film thickness decreases. Specifically, the term relating to the film thickness ultraviolet ray is expressed by the following equation (5).

  y2 = exp (C · x2) (5)

  Here, x2 is the film thickness of the gel coat part 32, and y2 is the amount of ultraviolet rays transmitted per unit time of the gel coat part 32. C is a negative predetermined coefficient. The term relating to the film thickness ultraviolet ray is not limited to the exponential function (5) as long as the amount of transmitted ultraviolet light increases as the film thickness decreases. Also good.

  In the present embodiment, the term relating to the film thickness ultraviolet ray is specifically obtained by carrying out an ultraviolet ray irradiation test on the gel coat 110 for ultraviolet ray test and then performing infrared spectroscopy. The UV test gel coat 110 contains a predetermined amount of the same pigment Pig (titanium oxide) as the gel coat part 32. The ultraviolet irradiation test is a test in which ultraviolet rays are irradiated for a predetermined period, and here, it is one year. The pigment Pig content of the UV test gel coat 110 is measured by EPMA (Electron Probe MicroAnalyzer).

  Infrared spectroscopy is an analysis method for acquiring information such as the molecular structure of an object by irradiating the object with infrared light and analyzing the wavelength spectrum of transmitted infrared light (or reflected infrared light). Specifically, when the object is irradiated with infrared rays, the irradiated infrared rays are absorbed by the object by exciting the object. Since the wavelength of absorbed infrared light varies depending on the type of chemical bond of the object, it is possible to recognize the chemical bond of the object by analyzing the wavelength of the infrared light and the absorbance indicating the intensity of the absorbed infrared light. it can.

  Here, the UV test gel coat 110 after UV irradiation has a predetermined chemical bond broken by the UV. Therefore, when the ultraviolet ray test gel coat 110 after the ultraviolet ray irradiation is irradiated with infrared rays, the absorbance of the infrared rays at the wavelength corresponding to the broken chemical bond becomes small. Hereinafter, an infrared wavelength corresponding to a broken chemical bond is referred to as a specific wavelength.

  The intensity of transmitted infrared light is obtained by subtracting the absorbance from the intensity of irradiated infrared light. Therefore, when the ultraviolet ray test gel coat 110 after the ultraviolet ray irradiation is irradiated with infrared rays, the amount of decrease in the intensity of transmitted infrared rays at a specific wavelength becomes small. Ultraviolet rays are reflected and absorbed by the molecules in the gel coat 110 for UV test. Therefore, the irradiation amount of ultraviolet rays becomes smaller as the surface depth of the UV test gel coat 110 becomes deeper, and the chemical bond breaking amount becomes smaller. Accordingly, as the surface depth of the UV test gel coat 110 increases, the absorbance at a specific wavelength decreases, and the intensity of transmitted infrared light at the specific wavelength increases.

  FIG. 9 is a graph showing an example of the intensity of transmitted infrared light when infrared spectroscopy is applied to the UV test gel coat. The horizontal axis in FIG. 9 is the wavelength of infrared rays irradiated on the UV test gel coat 110 after ultraviolet irradiation, and the vertical axis is the intensity of transmitted infrared rays. A curve α0 in FIG. 9 shows a wavelength spectrum of the intensity of transmitted infrared light on the surface (surface depth is zero) of the UV test gel coat 110. A curve α1 in FIG. 9 shows a wavelength spectrum of the intensity of transmitted infrared rays at the surface depth d1 of the UV test gel coat 110. A curve α2 in FIG. 9 shows a wavelength spectrum of the intensity of transmitted infrared rays at the surface depth d2 of the gel coat 110 for UV test. The surface depth d1 is a value larger than zero and smaller than the surface depth d2. That is, the curve α2 shows the wavelength spectrum of the intensity of transmitted infrared light when the surface depth is the deepest. The wavelength W is a specific wavelength.

When comparing peak B0 which is a peak at wavelength W of curve α0, peak B1 which is a peak at wavelength W of curve α1 and peak B2 which is a peak at wavelength W of curve α2, the intensity of transmitted infrared light is It can be seen that the wavelength W increases as the surface depth of the UV-coating gel coat 110 increases. In the UV test gel coat 110,> C = C <bond is broken by irradiation with ultraviolet rays. Since the wavelength corresponding to> C = C <bond is around 1500 cm ⁻¹ , the wavelength W as the specific wavelength is around 1500 cm ⁻¹ . However, the specific wavelength is not limited to this wavelength W, and can be appropriately determined from the waveform.

  FIG. 10 is a graph showing the amount of reduction in the infrared peak area for each surface depth of the UV test gel coat. The horizontal axis in FIG. 10 is the surface depth of the UV-coating gel coat 110, and the vertical axis is the amount of reduction in the peak area of the infrared intensity at the wavelength W. The amount of decrease in the peak area of the infrared intensity at the wavelength W is the amount of decrease in the peak area of the infrared intensity at the wavelength W when irradiated with ultraviolet rays. That is, the amount of decrease in the peak area of the infrared intensity at the wavelength W is the value for the ultraviolet test after irradiation with ultraviolet rays from the value of the peak area of the infrared intensity at the wavelength W of the gel coat 110 for ultraviolet testing before irradiation with ultraviolet rays. The value of the peak area of the infrared intensity at the wavelength W of the gel coat 110 is subtracted. Therefore, it can be said that the amount of decrease in the peak area of the infrared intensity at the wavelength W is the absorbance of the infrared at the wavelength W.

  FIG. 10 is a graph showing the relationship between the reduction amount of the peak area at the wavelength W and the surface depth. The peak area of the infrared intensity at the wavelength W indicates the intensity of the transmitted infrared light at the wavelength W, and the decrease in the peak area of the infrared intensity at the wavelength W is small. It indicates that the intensity is large, and further indicates that the amount of ultraviolet irradiation is small.

  Q0 in FIG. 10 indicates the value of the infrared peak area reduction amount at the wavelength W on the surface of the UV test gel coat 110. That is, the value of the area of the peak B0. A point Q1 in FIG. 10 is a value of the area of the peak B1 at the wavelength W at the surface depth d1 of the gel coat 110 for ultraviolet test. The point Q2 in FIG. 10 is the value of the area of the peak B2 at the wavelength W at the surface depth d2 of the UV-coating gel coat 110. A curve C1 in FIG. 10 is an approximate exponential curve of points Q0, Q1, and Q2. In the UV test gel coat 110, the relationship between the surface depth and the amount of decrease in the peak area at the wavelength W is approximated by the approximate expression represented by the curve C1. According to the curve C1, the UV test gel coat 110 has a smaller peak area decrease (absorbance) as the surface depth becomes deeper. That is, the curve C1 shows that the ultraviolet irradiation amount decreases as the surface depth of the UV test gel coat 110 increases.

  Further, the curve C1 in FIG. 10 shows how much ultraviolet rays are irradiated per unit time at each surface depth of the gel coat 110 for ultraviolet test. Therefore, it can be said that the curve C1 in FIG. 10 shows the amount of transmitted UV light per unit time for each surface depth of the UV test gel coat 110. For example, the amount of transmitted UV light at the surface depth d1 of the UV test gel coat 110 is synonymous with the amount of UV light transmitted by the UV test gel coat 110 having a film thickness d1 per unit time. Therefore, in the present embodiment, the curve C1 in FIG. 10 is replaced with the relationship between the film thickness of the gel coat portion 32 and the amount of transmitted UV light per unit time when the pigment Pig content is the same as the gel coat 110 for UV test. That is, in this embodiment, the film thickness ultraviolet ray related term is calculated based on the curve C1 in FIG. The unit time here is one year, which is a predetermined period of the ultraviolet irradiation test.

  FIG. 11 is a graph showing an example of terms related to film thickness ultraviolet rays. The horizontal axis of FIG. 11 indicates the film thickness of the gel coat part 32, and the vertical axis indicates the amount of ultraviolet light transmitted per unit time of the gel coat part 32. A curve C2 in FIG. 11 is obtained by replacing the approximate expression represented by the curve C1 with the relationship between the film thickness of the gel coat portion 32 and the amount of transmitted UV light per unit time. That is, the curve C2 in FIG. 11 is obtained by replacing the horizontal axis with the film thickness of the gel coat portion 32 and the vertical axis with the amount of transmitted UV light per unit time for C1 in FIG.

  In the present embodiment, the above-described ultraviolet transmission test is performed on a plurality of gel coats having different pigment Pig content, and the ultraviolet ray-related term for each pigment Pig content is calculated. A pigment ultraviolet ray related term indicating the relationship between the pigment Pigg content and the film thickness of the gel coat portion 32 and the ultraviolet ray transmission amount per unit time is calculated based on a plurality of film thickness ultraviolet ray related terms for each pigment Pig content. Is done.

  The ultraviolet ray transmission amount increases as the pigment Pig content decreases. However, this relationship varies depending on the components of the pigment. When the pigment is titanium oxide, the ultraviolet ray transmission amount increases as the pigment content decreases, but some pigments have a UV transmission amount that decreases as the pigment content decreases. When the pigment is a material having a smaller reflectance than the resin component of the gel coat portion 32, the amount of transmitted UV light decreases as the pigment content decreases. Further, when the pigment is a material having a higher reflectance than the resin component of the gel coat portion 32, the amount of transmitted ultraviolet light increases as the pigment content decreases.

  As described above, the ultraviolet ray transmission amount changes according to the content of the pigment Pig. In the present embodiment, the relationship between the film thickness and the ultraviolet ray transmission amount is calculated from the film thickness ultraviolet ray relation term, and the pigment pig content and the ultraviolet ray transmission are obtained from a plurality of film thickness ultraviolet ray relation terms for each pigment Pig content. Calculate the relationship with the quantity. Specifically, a pigment ultraviolet ray relation term indicating the relation between the pigment pig content and the film thickness and the ultraviolet ray transmission amount is calculated from a plurality of film thickness ultraviolet ray relation terms for each pigment Pig content. The pigment ultraviolet ray related term is expressed by the following formula (6).

  y3 = D · x3 · y2 (6)

  Here, x3 is the pigment content of the target gel coat portion 32. y3 is the amount of ultraviolet light transmitted per unit time of the gel coat portion 32 when the pigment content of the gel coat portion 32 is x3. D is a predetermined coefficient obtained based on a plurality of terms relating to film thickness ultraviolet rays for each pigment content. A method for calculating the pigment content of the target gel coat portion 32 will be described later.

  FIG. 12 is a graph showing an example of a pigment ultraviolet ray related term. The horizontal axis of FIG. 12 indicates the film thickness of the gel coat part 32, and the vertical axis indicates the amount of ultraviolet light transmitted per unit time of the gel coat part 32. A curve C2a in FIG. 12 shows a pigment ultraviolet ray-related term when the content of the pigment Pig is a%. A curve C2b in FIG. 12 shows a pigment ultraviolet ray-related term when the content of the pigment Pig is b%. A curve C2c in FIG. 12 shows a pigment ultraviolet ray-related term when the content of the pigment Pig is c%. Of a%, b%, and c%, a% is the smallest and c% is the largest. Thus, according to the pigment ultraviolet ray related term, the ultraviolet ray transmission amount can be calculated from the pigment content and the film thickness.

  The steps of the pigment ultraviolet ray related term calculation method described above will be described based on a flowchart. FIG. 13 is a flowchart showing steps of a method for calculating a pigment ultraviolet ray related term. As shown in FIG. 13, in the method for calculating the pigment ultraviolet ray-related term, first, an ultraviolet irradiation test is performed in which the ultraviolet test gel coat 110 having the pigment Pig content is a predetermined value is irradiated (step S20). . After performing the ultraviolet irradiation test, the method for obtaining the pigment ultraviolet ray-related term is to irradiate the ultraviolet test gel coat 110 with infrared rays and measure the infrared absorbance for each surface depth of the ultraviolet test gel coat 110 (step S22). ). After measuring the absorbance of infrared rays for each surface depth, the method for obtaining the pigment ultraviolet ray-related term is to obtain the specific wavelength absorbance, which is the absorbance of infrared rays at a specific wavelength (wavelength W), for each surface depth of the gel coat 110 for ultraviolet testing. Calculate (step S24). After calculating the specific wavelength absorbance for each surface depth, the calculation method of the ultraviolet ray transmission amount calculation term calculates the film thickness ultraviolet ray related term for a predetermined pigment content based on the specific wavelength absorbance for each surface depth (step) S26). After calculating the ultraviolet ray-related term for the UV test gel coat 110 in which the pigment Pig content is a predetermined value, the method for calculating the UV transmittance calculation term is a step S20 for a plurality of gel coats having different pigment Pig content. Then, the process of step S26 is performed to calculate each ultraviolet ray related term of film thickness (step S28), and the ultraviolet ray related term of pigment is calculated based on the plurality of ultraviolet ray related terms of film thickness (step S29). Thus, the pigment ultraviolet ray related term calculation process ends.

  Next, the lightness pigment relational term indicating the relationship between the lightness of the gel coat part 32 and the content of the pigment Pig contained in the gel coat part 32 will be described. The brightness of the gel coat part 32 and the content of the pigment Pig contained in the gel coat part 32 are in a correspondence relationship. FIG. 14 is a graph showing an example of a light pigment related term. The horizontal axis of FIG. 14 is the brightness, and the vertical axis is the pigment content (%). A curve C3 shown in FIG. 14 indicates a lightness pigment related term. As indicated by the curve C3, the pigment Pig (titanium oxide) increases the brightness of the gel coat portion 32 as the content increases. The curve C3 is an example of a light pigment related term, and the light pigment related term changes depending on the pigment component.

  The lightness ultraviolet relation term indicating the relationship between the lightness and film thickness of the gel coat portion 32 and the amount of transmitted ultraviolet light is calculated based on the lightness pigment relation term and the pigment ultraviolet light relation term. That is, the lightness ultraviolet ray related term is obtained by replacing the pigment content x3 in the pigment ultraviolet ray related term with the lightness based on the lightness pigment related term. FIG. 15 is a graph showing an example of terms related to lightness ultraviolet rays. The horizontal axis in FIG. 15 indicates the film thickness of the gel coat part 32, and the vertical axis indicates the amount of UV transmission per unit time of the gel coat part 32. The lightness value of the gel coat portion 32 when the pigment Pig content is a% calculated based on the lightness pigment relation term is defined as lightness a. Similarly, the lightness value of the gel coat part 32 when the content of the pigment Pig is b% is defined as lightness b. The brightness value of the gel coat portion 32 when the content of the pigment Pig is c% is defined as brightness c. As shown in FIG. 15, the value UV related term in the case of lightness a is as shown by the curve C2a, and the value UV related term in the case of lightness b is as shown in the curve C2b. The related term is as shown by the curve C2c. Thus, by calculating the brightness ultraviolet relation term by applying the pigment ultraviolet relation term to the light pigment relation term, the relationship between the pigment Pig content and the film thickness and the ultraviolet transmission amount is obtained. It can correct | amend to the relationship which shows quantity.

  The steps of the lightness ultraviolet ray related term calculation method described above will be described with reference to a flowchart. FIG. 16 is a flowchart showing the steps of a method for calculating a brightness ultraviolet ray related term. As shown in FIG. 16, the lightness ultraviolet ray related term calculation method acquires the lightness pigment related term (step S30). The brightness pigment-related terms are, for example, as shown in FIG. After obtaining the lightness pigment related term, the lightness UV related term calculation method obtains the pigment UV related term (step S32). The pigment ultraviolet ray related term is for obtaining the pigment ultraviolet ray related term calculated in the step shown in FIG. Note that step S32 may be performed before or simultaneously with step S30. After obtaining the pigment ultraviolet ray related term, the lightness ultraviolet ray related term is calculated based on the lightness pigment related term and the pigment ultraviolet ray related term (step S34). The lightness ultraviolet ray related term is calculated by replacing the pigment content x3 in the pigment ultraviolet ray related term with the lightness based on the lightness pigment related term. Thereby, the calculation process of the brightness ultraviolet ray related term ends. In the present embodiment, the method for acquiring the brightness ultraviolet ray related term acquires the brightness ultraviolet ray related term calculated as described above.

  Note that the lightness ultraviolet ray related term does not have to be calculated based on the pigment ultraviolet ray related term and the lightness pigment related term as described above, and may be any as long as it shows the relationship between the lightness and the amount of transmitted ultraviolet light. For example, the lightness ultraviolet ray related term is calculated by measuring the lightness of the gel coat 110 for ultraviolet light test, and carrying out measurements by ultraviolet irradiation test and infrared spectroscopy for a plurality of gel coats having different lightnesses. You may measure the relationship between thickness and ultraviolet-ray transmission amount. According to this method, the lightness ultraviolet ray related term can be calculated without using the lightness pigment related term.

  The reflectance of the gel coat portion 32 has a corresponding relationship with the content of the pigment Pig. Accordingly, the reflectance film thickness relationship term in FIG. 6 can be replaced with a pigment film thickness relationship term with the horizontal axis representing the pigment Pig content. In this case, without using the relationship between the brightness and the reflectance shown in FIG. 7 and the two relationship terms of the lightness pigment relationship shown in FIG. A brightness ultraviolet ray related term can be calculated.

(Calculation method of UV transmission)
Next, a method for calculating the amount of ultraviolet rays (the amount of ultraviolet rays transmitted) that the gel coat portion 32 transmits will be described. The method for calculating the amount of ultraviolet light transmitted through the gel coat portion 32 according to the present embodiment can calculate the amount of ultraviolet light transmitted through the gel coat portion 32 based on the lightness information and film thickness information of the gel coat portion 32 and the lightness ultraviolet light related term. . FIG. 17 is a flowchart showing the steps of the method for calculating the amount of ultraviolet light transmitted through the gel coat portion.

  As shown in FIG. 17, in the method for calculating the amount of transmitted ultraviolet light of the gel coat part 32, first, information on the lightness of the gel coat part 32 is acquired (step S40). The ultraviolet ray transmission amount calculation method of the gel coat part 32 acquires the lightness of the gel coat part 32 by measuring the lightness value with a colorimeter with respect to the gel coat part 32 of the target parabona antenna unit 1. However, the lightness information of the gel coat part 32 may be data measured at the time of lamination, for example, or may be calculated from the pigment content without performing the measurement.

  After acquiring the lightness information of the gel coat part 32, the UV transmission amount calculation method of the gel coat part 32 acquires the film thickness information of the gel coat part 32 per unit time (step S42). The ultraviolet ray transmission amount calculation method of the gel coat part 32 acquires the film thickness value per unit time of the gel coat part 32 calculated by the method of FIG.

  After acquiring the information on the film thickness of the gel coat part 32 for each unit time, the ultraviolet ray transmission amount calculation method of the gel coat part 32 acquires brightness ultraviolet light related terms (step S44). The ultraviolet ray transmission amount calculation method of the gel coat part 32 acquires the brightness ultraviolet ray related term calculated by the method of FIG. Note that step S44 may be performed before or simultaneously with step S42.

  After acquiring the brightness ultraviolet ray related term, the ultraviolet ray transmission amount calculation method of the gel coat portion 32 calculates the ultraviolet ray transmission amount of the gel coat portion 32 per unit time (step S46). The method of calculating the amount of ultraviolet light transmitted through the gel coat part 32 is to substitute the film thickness value per unit time of the gel coat part 32 and the lightness value of the gel coat part 32 into the brightness ultraviolet light related term, thereby obtaining the gel coat part 32 per unit time. The amount of transmitted ultraviolet light is calculated.

  After calculating the amount of UV transmission of the gel coat part 32 per unit time, the method of calculating the amount of UV transmission of the gel coat part 32 integrates the amount of UV transmission of the gel coat part 32 per unit time to calculate the amount of UV transmission of the gel coat part 32. Is integrated (step S48). Thereby, the calculation process of the ultraviolet transmission amount of the gel coat part 32 is completed.

  Table 2 is a table showing an example of the integrated amount of the amount of transmitted ultraviolet light of the gel coat portion having a predetermined brightness value calculated by the processing shown in FIG.

  In the example of Table 2, the film thickness of the gel coat part 32 at 0 year (the film thickness of the gel coat part 32 at the time of lamination) is 110 μm, and the UV transmission amount of the gel coat part 32 from 0 years to 1 year as the unit period is 0.0016. Further, in this case, the integrated value of the amount of transmitted UV light of the gel coat portion 32 (at the time when one year has elapsed) is similarly 0.0016 since the year has passed for only one year. The value of the amount of transmitted ultraviolet light is a value when the amount of ultraviolet light irradiated to the base material 37 for one year is 1 when the gel coat portion 32 is not provided.

  Moreover, in the example of Table 2, the film thickness of the gel coat part 32 after one year passes is 108.1 micrometers, and the ultraviolet-ray transmission amount of the gel coat part 32 in 1 to 2 years which is a unit period is 0.0018. . In this case, the integrated value of the amount of ultraviolet light transmitted through the gel coat portion 32 (after the passage of two years) is the amount of ultraviolet light transmitted through the gel coat portion 32 from 0 to 1 year and the amount of ultraviolet light transmitted through the gel coat portion 32 from 1 to 2 years. The amount is integrated to be 0.0034.

  In the example of Table 2, the film thickness of the gel coat becomes 0 μm after the lapse of AA years, and the gel coat portion 32 disappears. In this case, the amount of ultraviolet light transmitted through the gel coat part 32 from unit AA to AA + 1 is one. In this case (when AA + 1 year elapses), the integrated value of the amount of ultraviolet light transmitted through the gel coat part 32 is a value obtained by integrating the amount of ultraviolet light transmitted through the gel coat part 32 up to AA + 1 year.

  The method for calculating the amount of transmitted ultraviolet light may be a method for calculating only the amount of transmitted ultraviolet light in a unit period without calculating the integrated value of the amount of transmitted ultraviolet light. In this case, the UV transmission amount calculation method obtains the brightness value of the gel coat part 32, the thickness value of the gel coat part 32 in the unit period, and the brightness UV-related term without calculating the film thickness reduction amount or the like. By simply doing this, the amount of transmitted ultraviolet light can be calculated.

  As described above, the method for calculating the amount of ultraviolet light transmitted through the gel coat part 32 includes a brightness acquisition step for acquiring information on the brightness of the gel coat part 32, and a film thickness information acquisition step for acquiring information on the film thickness of the gel coat part 32. , A lightness ultraviolet ray related term acquisition step for obtaining a lightness ultraviolet ray related term indicating the relationship between the amount of ultraviolet light transmitted through the gel coat part 32 and the film thickness and lightness of the gel coat part 32; information on the lightness of the gel coat part 32; And an ultraviolet ray transmission amount calculating step for calculating the ultraviolet ray transmission amount of the gel coat part 32 based on the lightness ultraviolet ray related term.

  The ultraviolet rays irradiated to the gel coat part 32 are more easily reflected as the lightness of the gel coat part 32 is higher. Accordingly, the amount of ultraviolet light transmitted through the gel coat portion 32 varies depending on the brightness of the gel coat portion 32. Since the method for calculating the amount of transmitted ultraviolet light according to the present embodiment calculates the amount of transmitted ultraviolet light based on the lightness of the gel coat portion 32, the amount of transmitted ultraviolet light of the gel coat portion 32 can be accurately calculated. Therefore, according to the method for calculating the amount of transmitted ultraviolet light according to the present embodiment, the strength state of the radome 30 can be appropriately recognized.

  The UV transmission amount calculation step calculates the UV transmission amount of the gel coat part 32 over time based on the information on the lightness of the gel coat part 32, the film thickness of the gel coat part 32 over time, and the lightness ultraviolet ray related term. And a step of calculating the integrated amount of the ultraviolet light transmission amount of the gel coat part 32 by summing the ultraviolet light transmission amounts of the gel coat part 32 over time. The method for calculating the amount of transmitted UV light according to the present embodiment calculates the amount of UV transmitted over time based on the lightness of the gel coat part 32. Therefore, the integrated value of the amount of transmitted UV light to the radome 30 installed outside for a long period of time. Can be calculated accurately. Therefore, according to the method for calculating the amount of transmitted ultraviolet light according to the present embodiment, the strength state of the radome 30 can be appropriately recognized.

  The film thickness information acquisition step acquires a film thickness reduction rate calculation term indicating the relationship between the step of acquiring the film thickness of the gel coat part 32 at the time of lamination and the brightness of the gel coat part 32 and the film thickness reduction speed. A film thickness reduction rate calculation term acquisition step, a film thickness reduction rate calculation step for calculating a film thickness reduction rate of the gel coat portion 32 based on the lightness information of the gel coat portion 32 and a film thickness reduction rate calculation term, And calculating the film thickness of the gel coat part 32 over time based on the film thickness of the gel coat part 32 and the film thickness reduction rate. The method for calculating the amount of transmitted UV light according to the present embodiment can calculate the integrated amount of the amount of transmitted UV light of the gel coat part 32 more accurately in consideration of the change in the film thickness of the gel coat part 32 per unit time. Furthermore, the method for calculating the amount of transmitted ultraviolet light according to the present embodiment calculates the change in film thickness per unit time of the gel coat portion 32 based on the brightness. Therefore, the method for calculating the amount of transmitted UV light according to the present embodiment can more accurately calculate the change in film thickness of the gel coat portion 32 per unit time.

  The film thickness reduction rate calculation term is such that the film thickness reduction rate decreases as the lightness of the gel coat portion 32 increases. Therefore, the method for calculating the amount of transmitted ultraviolet light according to the present embodiment can calculate the film thickness reduction rate more accurately.

  Further, the lightness ultraviolet ray related term acquisition step includes a step of obtaining a lightness pigment related term indicating a relationship between the lightness of the gel coat portion 32 and the content of the pigment Pig contained in the gel coat portion 32, and the content of the pigment Pig and the gel coat portion. A step of obtaining a pigment ultraviolet ray related term indicating the relationship between the film thickness of 32 and the amount of transmitted ultraviolet light, and a step of calculating the lightness ultraviolet ray related term based on the lightness pigment related term and the pigment ultraviolet ray related term. Since the method for calculating the amount of transmitted ultraviolet light according to the present embodiment calculates the lightness ultraviolet ray related term based on the content of the pigment Pig, the lightness ultraviolet ray related term can be calculated more accurately.

  Further, in the lightness ultraviolet ray related term, the larger the lightness of the gel coat portion 32, the smaller the ultraviolet ray transmission amount. Therefore, the ultraviolet ray transmission amount calculation method according to the present embodiment can calculate the ultraviolet ray transmission amount more accurately. Further, the lightness ultraviolet ray related term is such that the larger the film thickness of the gel coat part 32, the smaller the ultraviolet ray transmission amount. Therefore, the ultraviolet ray transmission amount calculation method according to the present embodiment can calculate the ultraviolet ray transmission amount more accurately.

  In addition, the method for calculating the amount of transmitted ultraviolet light according to the present embodiment calculates the amount of transmitted ultraviolet light of the gel coat portion 32 laminated on the radome 30 that is the radome of the parabona antenna. Some parabona antennas are arranged at high places, and replacement of a radome or the like is difficult particularly with a large parabona antenna. Therefore, calculating the amount of ultraviolet light transmitted through the gel coat portion 32 according to the present embodiment and accurately recognizing the strength state of the radome portion 30 can reduce, for example, unnecessary replacement work opportunities. However, in the present embodiment, the radome of the parabona antenna including the gel coat part 32 and the GFRP part 34 has been described. However, the method of calculating the integrated amount of the UV transmission amount of the gel coat part 32 is limited to the radome of the parabona antenna. I can't. The method for calculating the integrated amount of the UV transmission amount of the gel coat part 32 is applicable to any laminate as long as it has a base material and a resin laminated on the surface of the base material and is irradiated with external light. be able to.

(Calculation of radome strength deterioration rate)
In the present embodiment, as described above, the integrated amount of the UV transmission amount of the gel coat portion 32 is calculated, and the degree of deterioration (deterioration) of the strength of the radome portion 30 based on the calculated integrated amount of the UV transmission amount of the gel coat portion 32. Rate). Hereinafter, a method for calculating the strength deterioration rate of the radome 30 will be described.

  The calculation method of the strength deterioration rate of the radome 30 includes the reference strength rate indicating the relationship between the amount of UV irradiation to the GFRP portion 34 of the base material 37 and the strength deterioration rate of the base material 37, and the UV transmission of the gel coat portion 32. The strength deterioration rate of the radome 30 is calculated based on the integrated amount.

  Table 3 is a table showing an example of the reference intensity rate. Table 3 shows the strength deterioration rate of the base material 37 when an exposure test is performed on the base material 37 on which the gel coat portion 32 is not laminated. The exposure period in Table 3 indicates the exposure period to the base material 37. The UV irradiation amount in Table 3 indicates the UV transmission amount to the GFRP portion 34 of the base material 37. As described above, the ultraviolet irradiation amount is a value when the irradiation amount of ultraviolet rays for one year to the GFRP portion 34 of the base material 37 on which the gel coat portion 32 is not laminated is set to 1. Therefore, the ultraviolet irradiation amount is 1 in the exposure period of 1 year. The reference strength rate in Table 3 indicates the strength of the base material 37 for each exposure period when the strength of the base material 37 in the exposure period of 0 years is 100. That is, this reference strength rate indicates the strength deterioration rate of the base material 37 when the gel coat portion 32 is not laminated. The reference strength rate is calculated from the result of the strength test performed on the base material 37 after the exposure test.

  As shown in Table 3, the ultraviolet irradiation amount in the exposure period of 0 years is 0, and the reference intensity rate is 100%. Moreover, the ultraviolet irradiation amount in the exposure period of 1 year is 1, and the reference intensity rate is 97.3%. Moreover, the ultraviolet irradiation amount of the exposure period of 2 years is 2, and the standard intensity rate is 96.3%. Moreover, the ultraviolet irradiation amount in an exposure period of 10 years is 10, and the reference intensity rate is 90.3%. Moreover, the ultraviolet irradiation amount of the exposure period of 15 years is 15, and the reference intensity rate is 87.7%.

  As shown in Table 2, the integrated amount of the ultraviolet ray transmission amount of the gel coat part 32 in AA year was 10. That is, when the gel coat portion 32 is laminated, the amount of ultraviolet irradiation to the GFRP portion 34 in the year AA is the same as the amount of ultraviolet irradiation for the exposure period of 10 years shown in Table 3. Accordingly, the strength of the radome 30 in AA when the gel coat portion 32 is laminated is the same as the reference strength rate 90.3%. That is, the strength deterioration rate of the radome 30 in AA when the gel coat portion 32 is laminated is 9.7%.

  In addition, although the calculation method of the strength deterioration rate of the radome part 30 is calculated from Table 3 as described above, it is not limited thereto. The calculation method of the strength deterioration rate of the radome part 30 is calculated based on the relationship between the amount of ultraviolet irradiation to the base material 37 when the gel coat part 32 is not laminated and the strength of the base material 37 for each exposure period. I just need it.

  As described above, the method for calculating the strength deterioration rate of the radome 30 calculates the strength deterioration rate of the radome 30 when the gel coat portion 32 is laminated. The steps of the calculation method will be described based on a flowchart. FIG. 18 is a flowchart showing the steps of a method for calculating the strength deterioration rate of the radome.

  As shown in FIG. 18, in the method of calculating the strength deterioration rate of the radome portion 30, first, the reference strength rate of the radome portion 30 is acquired (step S50). The reference intensity ratio of the radome portion 30 is a value shown in Table 3, and indicates the amount of ultraviolet irradiation to the base material 37 when the gel coat portion 32 is not laminated and the strength of the base material 37 for each exposure period.

  After obtaining the reference intensity rate of the radome 30, the method for calculating the strength deterioration rate of the radome 30 calculates the integrated value of the amount of ultraviolet light transmitted through the gel coat portion 32 (step S 52). The calculation method of the strength deterioration rate of the radome part 30 calculates the integrated value of the amount of ultraviolet light transmitted through the gel coat part 32 by the process shown in FIG. This step S52 may be performed prior to step S50.

  After calculating the integrated value of the UV transmission amount of the gel coat part 32, the method of calculating the strength deterioration rate of the radome part 30 compares the integrated value of the UV transmission amount of the gel coat part 32 with the reference intensity rate of the radome part 30. Then, the strength deterioration rate of the radome 30 is calculated (step S54). More specifically, the method for calculating the strength deterioration rate of the radome 30 compares the integrated value of the UV transmission amount of the gel coat portion 32 with the UV irradiation amount shown in Table 3, and integrates the UV transmission amount of the gel coat portion 32. The number of years irradiated with the same amount of UV irradiation is read from Table 3. In the method of calculating the strength deterioration rate of the radome 30, the strength deterioration rate of the base material 37 in the read years is used as the strength deterioration rate of the radome 30. Thus, the calculation process of the strength deterioration rate of the radome 30 is completed.

  As described above, the method of calculating the strength deterioration rate of the radome 30 includes the step of obtaining the reference strength rate, the step of calculating the integrated value of the amount of UV transmission of the gel coat portion 32, and the amount of UV transmission of the gel coat portion 32. And calculating a strength deterioration rate of the radome 30 based on the integrated value and the reference strength rate. The method for calculating the strength degradation rate of the radome 30 thus accurately calculates the strength degradation rate of the radome 30 because the strength degradation rate of the radome 30 is calculated from the integrated value of the amount of ultraviolet light transmitted through the gel coat portion 32. can do.

  As mentioned above, although embodiment of this invention was described, this invention is not limited by the content of these embodiment. In addition, the above-described constituent elements include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the above-described components can be appropriately combined. Furthermore, various omissions, substitutions, or changes of the components can be made without departing from the spirit of the above-described embodiment.

DESCRIPTION OF SYMBOLS 1 Parabona antenna unit 10 Support | pillar part 12 Connection part 20 Parabona antenna part 22 Main reflector part 26 Primary radiator 27 Sub reflector part 30 Radome part 32 Gel coat part 34, 36 GFRP part 35 Porous layer part 38 Top coat part

Claims (10)

In a laminate that has a base material and a resin laminated on the surface of the base material and is irradiated with external light, a method for calculating the amount of ultraviolet light transmitted through the resin,
A lightness acquisition step of acquiring lightness information of the resin;
Film thickness information acquisition step for acquiring information on the film thickness of the resin;
A lightness ultraviolet ray related term acquisition step for acquiring a lightness ultraviolet ray related term indicating a relationship between the ultraviolet ray transmission amount of the resin and the film thickness and the lightness of the resin;
UV transmission amount of the resin, comprising: information on the lightness of the resin, information on the film thickness of the resin, and an ultraviolet transmission amount calculation step of calculating an ultraviolet transmission amount of the resin based on the terms relating to the lightness ultraviolet ray. Calculation method. The ultraviolet ray transmission amount calculating step includes:
Based on the information on the lightness of the resin, the film thickness of the resin over time, and the brightness ultraviolet light relation term, calculating the amount of ultraviolet transmission per time of the resin;
The method according to claim 1, further comprising: calculating an integrated amount of the ultraviolet transmission amount of the resin by summing up the ultraviolet transmission amounts of the resin over time. The film thickness information acquisition step includes
Obtaining information on the film thickness of the resin during lamination;
A film thickness reduction rate calculation term acquisition step for acquiring a film thickness reduction rate calculation term indicating the relationship between the brightness of the resin and the film thickness reduction rate;
Based on the lightness information of the resin and the film thickness reduction rate calculation term, a film thickness reduction rate calculation step for calculating the film thickness reduction rate of the resin,
Based on the film thickness of the resin at the time of lamination and the film thickness reduction rate, calculating the film thickness of the resin over time;
The calculation method of the ultraviolet-ray transmission amount of resin of Claim 2 which has these.   The said film thickness reduction rate calculation term is a calculation method of the ultraviolet-ray transmission amount of resin of Claim 3 with which the said film thickness reduction rate becomes small, so that the brightness of the said resin is large. The brightness ultraviolet ray related term acquisition step includes:
Obtaining a brightness pigment relation term indicating a relation between the brightness of the resin and the content of the pigment contained in the resin;
Obtaining a pigment ultraviolet ray relation term indicating a relation between the content of the pigment and the film thickness of the resin and the ultraviolet ray transmission amount;
The method for calculating the amount of transmitted ultraviolet light according to any one of claims 1 to 4, further comprising: calculating the lightness ultraviolet ray related term based on the lightness pigment related term and the pigment ultraviolet ray related term. .   The method for calculating the amount of ultraviolet light transmission of a resin according to any one of claims 1 to 5, wherein the lightness ultraviolet ray related term is such that the amount of ultraviolet light transmission decreases as the lightness of the resin increases.   The method for calculating the ultraviolet ray transmission amount of a resin according to any one of claims 1 to 6, wherein the brightness ultraviolet ray related term is such that the ultraviolet ray transmission amount decreases as the resin film thickness increases. .   The method for calculating an amount of transmitted ultraviolet light according to any one of claims 1 to 7, wherein the laminated body is a radome provided in a parabona antenna. In a laminate having a base material and a resin laminated on the surface of the base material and irradiated with external light, a method for calculating the strength deterioration rate of the laminate,
Obtaining a reference intensity rate indicating a relationship between an ultraviolet irradiation amount to the base material and a strength deterioration rate of the base material;
Calculating the amount of ultraviolet light transmitted through the resin by the method according to any one of claims 1 to 7;
Calculating the strength deterioration rate of the laminate based on the reference strength rate and the amount of ultraviolet light transmitted through the resin.   The calculation method of the strength deterioration rate of the laminate according to claim 9, wherein the laminate is a radome provided in a parabona antenna.

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