JP2016027331A - Deterioration factor exposure amount measuring method of synthetic resin material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deterioration factor exposure amount measuring method of a synthetic resin material capable of measuring the deterioration factor exposure amount of the synthetic resin material (existing material) actually exposed to the deterioration factor, by simple means without destroying the synthetic resin material.SOLUTION: Fine irregularities are formed on a surface part of a synthetic resin material, and the synthetic resin material is exposed to a deterioration factor. Then, the degree of smoothness on the surface part is measured, and the exposure amount of the deterioration factor is measured from data of a correlation, which was acquired beforehand, between the deterioration factor exposure amount and the degree of smoothness on the surface part.SELECTED DRAWING: None

Description

  The present invention relates to a method for measuring a deterioration factor exposure amount of a synthetic resin material, and more particularly, to a method of measuring a deterioration factor exposure amount by measuring a degree of smoothing of a surface portion of a synthetic resin material.

  It is known that a synthetic resin material molded with a synthetic resin deteriorates mechanical characteristics and optical characteristics when exposed to deterioration factors such as light (particularly ultraviolet rays), heat, water, and oxygen for a long time. Therefore, if a method that can easily measure the deterioration factor exposure of the synthetic resin material is developed, the degree of progress of the deterioration of the synthetic resin material can be estimated, and for example, the replacement time of the synthetic resin material can be known. Very convenient and useful.

  By the way, as a method of measuring the amount of ultraviolet rays in a specific part of an outdoor structure, an accelerated deterioration test in which ultraviolet rays are irradiated from a super accelerated weathering tester is performed on a polycarbonate plate showing a yellowing degree proportional to the amount of ultraviolet rays. Acquire the correlation between the UV irradiation amount on the polycarbonate plate and the yellowing degree of the polycarbonate plate, and based on this correlation, specify from the yellowing degree of the polycarbonate plate placed in a specific place of the outdoor structure for a long time A simple ultraviolet ray amount measuring method for measuring the ultraviolet ray amount in a long period is known (Patent Document 1).

  In addition, as a method for evaluating the weather resistance of a resin molded product with a resin coating, the absorption spectrum of the resin coating is measured by the total reflection method of infrared absorption spectroscopy, and the absorbance derived from the coating component and the component of the resin molded product are measured. There is known a method for measuring weather resistance by measuring the ratio of the absorbance derived from the resin and determining the ratio between the functional group amount of the coating component in the resin coating and the functional group amount of the component of the resin molded product (Patent Literature). 2)

JP 2009-250699 A JP 2002-22648 A

It is desired that the method for measuring the exposure amount of the deterioration factor of the synthetic resin material has the following directity, nondestructive property, and on-site property.
That is, the deterioration of the synthetic resin material is caused by the deterioration factors such as light rays (particularly ultraviolet rays), heat, water, oxygen, etc. occurring and proceeding in a complex manner. The degree of progress of deterioration varies greatly depending on. Therefore, in order to grasp the accurate exposure amount of the degradation factor, it is necessary to directly grasp the degradation factor exposure amount of the synthetic resin material (current material) that has actually been exposed (directness).
In addition, the degradation factor exposure measurement method that requires obtaining a specimen for measurement from the current material may require destruction of the current material. In such a case, even if it is determined that there is no problem in use. This is not reasonable because it requires replacement with a new synthetic resin material. Therefore, it is desirable to be able to measure the exposure amount of deteriorating elements without destruction (non-destructive).
Furthermore, if it is possible to easily measure the degradation factor exposure at the site where the synthetic resin material is used, not only will it be possible to save the trouble of moving the synthetic resin material to the place where the measuring instrument is installed, but it will also be possible to immediately estimate the degree of deterioration of the synthetic resin material. Thus, for example, it can be exchanged with a new synthetic resin material on the spot, which is desirable (on-site performance).

  However, the method of using the yellowing degree for the measurement of the amount of ultraviolet rays as in the simple method for measuring the amount of ultraviolet ray in Patent Document 1 is that the measurement of the yellowing degree is caused by the measuring method, and the measurement specimen is processed into small pieces. Therefore, when measuring the amount of ultraviolet rays of a synthetic resin material by this method, it is necessary to destroy the synthetic resin material to create a small specimen, The degree of ultraviolet rays cannot be determined by measuring the degree. That is, this method lacks nondestructiveness. Moreover, since the measurement of yellowing degree cannot be performed at the use site of a synthetic resin material, this method lacks on-site property.

  On the other hand, the weather resistance evaluation method of Patent Document 2 cannot be adopted when evaluating the weather resistance of a resin molded product without a resin coating, and this method does not measure the exposure amount of ultraviolet rays or the like. Rather, the ratio of the functional group of the coating component contained in the initial resin coating to the functional group of the component of the resin molded product is determined to predict and evaluate the weather resistance after actual exposure use. Therefore, this method has no use in measuring the actual exposure amount of the deterioration factor of the synthetic resin material.

  The present invention has been made under the circumstances described above, and the problem to be solved is a synthetic resin material that guarantees the above-mentioned directness, non-destructive property, and on-site property and is actually exposed to deterioration elements. It is an object of the present invention to provide a method for measuring deterioration factor exposure of a synthetic resin material, which can measure the deterioration factor exposure amount of (current material) on the spot without destroying the synthetic resin material.

  In order to solve the above-described problem, the method for measuring the deterioration factor exposure amount of the synthetic resin material according to the present invention forms fine irregularities on the surface portion of the synthetic resin material, and after exposing the synthetic resin material to the deterioration element, the surface The degree of smoothing of the part is measured, and the exposure amount of the deteriorated element is measured. Here, the unevenness means concave or / and convex.

In the degradation element exposure measurement method of the present invention, it is desirable that the surface portion on which fine irregularities are formed is a surface portion made of polycarbonate resin.
Moreover, you may form the fine unevenness | corrugation of a surface part by attaching the measurement piece which formed the fine unevenness | corrugation on the surface to this surface part.
Furthermore, it is desirable that the ten-point average roughness Rz (ten-point average roughness Rz measured in a non-contact manner by a laser confocal method) of the fine irregularities on the surface portion is 40 to 200 μm. This ten-point average roughness Rz is defined in JIS B 0601: 1994, which corresponds to Rz _JIS in JIS B 0601: 2013.
Moreover, it is desirable that the means for measuring the degree of smoothing of the surface portion is measurement based on specular gloss.

  In the method for measuring the deterioration factor exposure amount of the synthetic resin material according to the present invention, when the surface portion of the synthetic resin material having fine unevenness is exposed to the deterioration element, the fine unevenness is reduced and the smoothing of the surface portion proceeds. It was completed based on the new knowledge that the degree of smoothing of the surface portion increases as the exposure amount of the deteriorating element increases, and the exposure amount of the deteriorating element and the degree of smoothing of the surface portion are measured in advance. By acquiring the data representing the correlation between the two, and measuring the degree of smoothing of the surface portion where the fine irregularities of the synthetic resin material (current material) that was actually exposed to the degradation element was formed, Based on the data representing the above correlation, the exposure amount of the deterioration factors of the current material can be measured without destroying the current material. Then, in the data representing the correlation, if the deterioration factor exposure corresponding to the use limit due to the deterioration of the synthetic resin material is determined, the degree of smoothing of the surface portion of the current material is measured to determine the deterioration factor exposure. Since the degree of progress of deterioration of the current material is immediately known when measured, it is possible to estimate the replacement time for a new synthetic resin material.

  Thus, the degradation factor exposure measurement method of the present invention smoothes the degradation factor exposure of the synthetic resin material (the current material) on the surface of the current material while ensuring the above-mentioned directness and non-destructiveness. It can be measured by a simple means of measuring the degree of the surface, especially when measuring the degree of smoothness of the surface portion with the specular gloss, on the site of use (installation) of the synthetic resin material (current material), For example, by simply applying a handy gloss meter to the surface part of the current material, the degree of smoothing of the surface part can be easily measured to measure the exposure amount of the deteriorated element, so the above-mentioned field property is also ensured. . In addition, the specular gloss is measured using the reflected light of the light emitted from the light source of the gloss meter, so it is possible to measure the surface of opaque or non-transparent synthetic resin materials. Because it is less susceptible to optical effects on site, it can be measured with high accuracy.

  As described later, when the surface portion forming the fine unevenness of the synthetic resin material is a surface portion made of polycarbonate resin, the exposure amount of the deterioration element and the degree of smoothing of the surface portion on which the fine unevenness is formed Therefore, by measuring the degree of smoothing of the surface part by the specular gloss, the exposure amount of the deteriorated element of the synthetic resin material can be accurately measured.

  Further, when the ten-point average roughness Rz of the fine irregularities on the surface portion (ten-point average roughness Rz measured in a non-contact manner by a laser confocal method) is 40 to 200 μm, the degree of smoothing of the surface portion due to exposure can be reduced. Appropriately measured by specular gloss, etc., it is possible to accurately measure the amount of exposure of the deterioration element of the synthetic resin material.

  Furthermore, when a fine unevenness is formed on the surface portion by attaching a measurement piece having fine unevenness on the surface to the surface portion of the synthetic resin material, the exposure amount of a desired portion of the synthetic resin material, for example, a deteriorated element, is reduced. Select the site that is expected to be the most, attach a measuring piece to the surface, and measure the degree of smoothness of the surface of the measuring piece, thereby measuring the maximum exposure of the deteriorating elements to the synthetic resin material. If the measuring piece is attached to a part that is difficult to measure, remove the measuring piece and measure the degree of smoothing of the surface of the measuring piece on site or It is possible to measure the amount of exposure of the deteriorating element by measuring the degree of smoothing of the surface by bringing it back. In addition, since fine irregularities are not formed on the surface portion of the synthetic resin material, there is no inconvenience that the aesthetic appearance of the synthetic resin material is impaired and the degree of freedom in product design is limited.

It is sectional drawing before the deterioration element exposure of the synthetic resin material which formed the fine unevenness | corrugation in the surface part. It is sectional drawing after the deterioration element exposure of the synthetic resin material. It is sectional drawing before the deterioration element exposure of the synthetic resin material which formed the fine unevenness | corrugation by attaching a measurement piece to the surface part. It is sectional drawing after the deterioration element exposure of the synthetic resin material. It is a SEM observation photograph of the surface part before the deterioration element exposure by the super accelerated weathering test of the polycarbonate resin board which formed the fine unevenness | corrugation in the surface part. It is a SEM observation photograph of the surface part after the deterioration element exposure by the super accelerated weathering test of the polycarbonate resin board.

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

  According to the method for measuring a degradation factor exposure of a synthetic resin material according to the present invention, first, as shown in FIG. 1, fine irregularities 2 are formed on the surface portion 1a of the synthetic resin material 1, and this synthetic resin material 1 is deteriorated. Expose to the element. Then, as the exposure amount (cumulative exposure amount) of the deterioration element increases, the fine irregularities 2 of the surface portion 1a are gradually scraped and reduced by the action of the deterioration element such as light and moisture, as shown in FIG. Smoothing of the surface portion 1a of the synthetic resin material 1 proceeds. Therefore, the degree of smoothing of the surface portion 1a after exposure is measured, and data representing the correlation between the exposure amount of the deteriorated element acquired in advance and the degree of smoothing of the surface portion (for example, the correlation is expressed). Based on a calibration curve or the like, the deterioration factor exposure amount of the synthetic resin material 1 is measured.

  As the target synthetic resin material 1, a molded product of a thermoplastic synthetic resin, particularly a molded product of a polycarbonate resin is preferably used. A molded product of a thermoplastic synthetic resin having a surface portion made of a polycarbonate resin is also preferably used. And when attaching the measurement piece 3 mentioned later to the surface part of a synthetic resin material, various synthetic resin molded articles, for example, molded articles, such as polyolefin resins, such as a vinyl chloride resin, polyethylene, and a polypropylene, an acrylic resin, a polyester resin, etc. Are all usable.

  Synthetic resin materials whose surface part that forms fine irregularities is made of polycarbonate resin, such as molded products of polycarbonate resin and synthetic resin parts that have a surface part made of polycarbonate resin, have surface parts made of other synthetic resins. Compared with synthetic resin material, the correlation between the exposure amount of deteriorating elements and the degree of smoothing of the surface with fine irregularities is clear, so measure the degree of smoothing of the surface. Thus, there is an advantage that it is possible to accurately measure the exposure amount of the deterioration element of the synthetic resin material.

  The shape of the synthetic resin material 1 is not limited to a flat plate shape as shown in FIGS. 1 and 2, and a desired shape such as a corrugated plate shape, a folded plate shape, a sheet shape, a column shape, an irregular solid shape, and the like. In addition, the product form of the synthetic resin material 1 includes roofing materials, daylighting window materials, building materials, road soundproof wall materials, exterior wall materials, housing materials, interior materials, partition materials, etc. And so on.

The ten-point average roughness Rz of the fine irregularities 2 formed on the surface portion 1a of the synthetic resin material 1 can be measured by two different measurement methods.
One of them is contact measurement by a stylus method, for example, using a Surfcom 130A manufactured by Tokyo Seimitsu Co., Ltd.
The other is non-contact measurement by the laser confocal method, for example, measurement is performed using a laser microscope VK-X100 manufactured by Keyence Corporation. Although the magnification is not limited, in this embodiment, the measurement is performed at a magnification of 5 times. This laser confocal non-contact measurement has an advantage that it can measure even very fine irregularities that are difficult to measure by stylus contact measurement.

The fine irregularities 2 formed on the surface portion 1a of the synthetic resin material 1 desirably have a ten-point average roughness Rz measured by a laser confocal method in the range of 40 to 200 μm. It is desirable that the distance Sm is in the range of 20 to 100 μm. When the fine irregularities 2 having Rz and Sm within the above range are formed on the surface portion 1a of the synthetic resin material 1 made of a polycarbonate resin plate, the test data of [Table 1] below (test data of test pieces 2 to 6) is obtained. As shown, the specular glossiness of the surface portion 1a after exposure of the deteriorating element is 7 or more higher than the specular glossiness of the surface portion 1a before the deteriorating element exposure, and it is clear that the degree of smoothing of the surface portion 1a has advanced. It can be confirmed by measuring with a gloss meter.
In addition, when measuring the ten-point average roughness Rz of the fine irregularities 2 by the stylus method, as can be seen from the test data (test data of test pieces 2 to 6) shown below, the ten-point average roughness Rz The roughness Rz is desirably in the range of 5 to 100 μm.

  That is, this Table 1 shows that the ten-point average roughness Rz measured by the laser confocal method is 3.3 to 607.7 μm by the transfer using the polishing roll described later (the ten-point average measured by the stylus method). Roughness Rs is in the range of 3.0 to 232.0 μm, and fine irregularities having an average interval of irregularities measured by the laser confocal method in the range of 17.1 to 172.3 μm are formed on the surface portion. Test pieces 1 to 7 having a thickness of 2 mm made of polycarbonate resin were subjected to a super accelerated weathering test [exposure test for 480 hours of light / condensation cycle using an i-super UV tester manufactured by Iwasaki Electric Co., Ltd.], and JIS Z 8741 The specular gloss before and after exposure (60 degree specular gloss), the amount of change in specular gloss before and after exposure, and whether or not the change in gloss visually can be discriminated. ◎ indicates that the change in glossiness can be clearly discerned visually, ○ indicates that the change in glossiness can be discerned visually, and △ indicates the change in glossiness visually. It represents a painful thing.

  According to Table 1, the ten-point average roughness Rz measured by the laser confocal method is smaller than 40 μm (the ten-point average roughness Rz measured by the stylus method is smaller than 5 μm), and the average interval Sm of the unevenness. Test piece 1 having a diameter of less than 20 μm, a ten-point average roughness Rz measured by the laser confocal method is larger than 200 μm (a ten-point average roughness Rz measured by the stylus method is larger than 100 μm), and the unevenness average All specimens 7 with a spacing Sm larger than 100 μm showed a small change in specular gloss before and after exposure as small as 5 or less, and clearly measured the degree of smoothing of the surface portion 1a with a gloss meter. It turns out that it is difficult to confirm. In contrast, the ten-point average roughness Rz measured by the laser confocal method is in the range of 40 to 200 μm (the ten-point average roughness Rz measured by the stylus method is in the range of 5 to 100 μm). Specimens 2 to 6 in which the average interval Sm is in the range of 20 to 100 μm have a large change in specular gloss before and after exposure of 7 or more, and it is clear that the degree of smoothing of the surface portion 1a has advanced. It can be seen that it can be confirmed by measuring. In particular, the ten-point average roughness Rz measured by the laser confocal method is in the range of 40 to 110 μm (the ten-point average roughness Rz measured by the stylus method is in the range of 8 to 25 μm), and the average spacing of the irregularities Specimens 2, 3 and 4 with Sm in the range of 20 to 40 μm have a very large change in specular gloss before and after exposure of 29 or more, and it is clear that the degree of smoothing of the surface portion 1a has progressed. In addition to being able to be confirmed by measuring with a photometer, it is possible to clearly determine the change in gloss before and after exposure by visual observation, which proves extremely preferable.

In the synthetic resin material 1 shown in FIG. 1, the fine irregularities 2 are formed over the entire surface portion 1a. However, the fine irregularities 2 are formed in a part of the surface portion 1a, for example, a corner portion or an edge region. May be. When the fine irregularities 2 are formed over the entire surface portion 1a, the fine irregularities 2 diffusely reflect the light, and the surface portion 1a may become dull or look whitish, which may impair the aesthetic appearance of the synthetic resin material 1. However, if the fine irregularities 2 are formed in the corner and edge regions that are not easily noticeable as described above, there is an advantage that such concerns can be eliminated. The partial region forming the fine irregularities 2 is a rectangular region having a size of about 40 to 100 mm in length and about 30 to 100 mm in width, for which specular gloss can be measured with a handy type gloss meter, for example. It is good.
The shape of the fine irregularities (concave or / and convex) is not particularly limited, and can be a desired shape, and the density for forming the concave or convex is not particularly limited.

  As a method for forming the fine irregularities 2 on the surface portion 1a of the synthetic resin material 1, irregularities are formed on the surface of the press plate used for press molding, or irregularities are formed on the roll surface used for extrusion molding. In addition, various methods can be adopted such as inverting and transferring them to the surface of the synthetic resin material. Among them, fine irregularities are formed on the entire surface or part of the surface of the polishing roll by means such as etching or sandblasting. A method of transferring fine irregularities of the polishing roll to the entire surface area 1a or a partial area of the surface portion 1a of the synthetic resin material 1 is preferably employed.

Further, as shown in FIG. 3, the surface of the synthetic resin material 1 is obtained by attaching a measurement piece 3 having a fine unevenness 2 similar to the above on the surface to a partial region of the surface portion 1 a of the synthetic resin material 1. You may form the fine unevenness | corrugation 2 in the one part area | region of the part 1a.
As the measuring piece 3, an adhesive layer such as an adhesive or an adhesive is provided on the back surface of a resin piece made of a polycarbonate resin having fine unevenness 2 formed on the surface by transferring fine unevenness on the surface of the polishing roll. A measurement piece having a three-layer structure covered with release paper is preferably used. Such a measurement piece has an advantage that it can be easily attached to a partial region of the front surface portion 1a of the synthetic resin material 1 by peeling off the release paper. In particular, the pressure sensitive adhesive layer is provided on the back surface of the synthetic resin material 1. Detachable measurement pieces that can be detachably attached are peeled off from the surface portion 1a of the synthetic resin material 1 if necessary and taken back to the measurement location, and the degree of smoothing of the measurement piece surface is measured at the measurement location and exposed to degradation elements. After measuring the amount, there is also an advantage that it can be used again for measurement of the exposure amount of the deteriorated element by sticking it again on the surface portion 1a of the synthetic resin material 1.

  Although the magnitude | size of the measurement piece 3 is not specifically limited, What has a magnitude | size of about 40-100 mm in length, about 30-100 mm in width, and about 20 micrometers-50 mm in thickness is suitable. With this size, specular gloss can be reliably measured with a gloss meter having a 40 x 30 mm measuring unit, and changes in gloss can be visually recognized with the naked eye. This is because there is little fear of impairing the aesthetics of the resin material 1.

The measurement piece 3 may be attached to the surface portion 1a of the synthetic resin material 1 by a physical method such as locking, fitting, screw fixing, or the measurement piece 3 may be attached without being fixed. If there is no concern that the position changes or the measurement piece 3 is lost, the measurement piece 3 may be simply left on the surface portion 1 a of the synthetic resin material 1.
Further, a plurality of measurement pieces 3 may be attached to one synthetic resin material 1 or one measurement piece 3 may be attached to one of the plurality of synthetic resin materials 1. It is possible to measure the exposure amount of each part of the synthetic resin material 1 depending on the part. In the latter case, the exposure amount of the deterioration factors of the plurality of synthetic resin materials 1 is represented by one measurement piece 3. It becomes possible to measure.

The synthetic resin material 1 having the fine irregularities 2 formed on the surface portion 1a is installed at a predetermined installation location outdoors or indoors, and is exposed to degradation factors such as light (particularly ultraviolet rays), moisture, heat, oxygen and the like. Thus, when the synthetic resin material 1 is exposed to the deteriorated element, the fine unevenness 2 of the surface portion 1a is gradually scraped and reduced by the action of the deteriorated element, and the surface portion 1a of the synthetic resin material 1 is smoothed. proceed.
FIG. 5 shows that the ten-point average roughness Rz measured by the laser confocal method is 83.5 μm (measured by the stylus method) by transferring fine irregularities on the surface of the polishing roll during extrusion molding of the polycarbonate resin plate. Super accelerated weathering test on polycarbonate resin plate (thickness 2mm) with fine irregularities with 10-point average roughness Rz of 23μm on the surface. Light / condensation cycle by Isuper UV tester manufactured by Iwasaki Electric Co., Ltd. Is an SEM observation photograph of the surface portion before exposure when the exposure test for 480 hours is performed, and FIG. 6 is an SEM observation photograph of the surface portion after exposure. If the SEM observation photograph of FIG. 5 and FIG. 6 is contrasted, it is clear that the fine unevenness | corrugation of the surface part of a polycarbonate resin board is shaved and reduced by exposure of a deterioration element, and the smoothing of a surface part advances. is there.
Further, when the above super accelerated weathering test is performed, the nominal strain at the time of tensile fracture of the polycarbonate resin plate is reduced from 114% before exposure to 16%, and the physical properties are greatly lowered.

Therefore, the degree of smoothing of the surface portion 1a of the synthetic resin material 1 is measured, and based on the data representing the correlation between the exposure amount of the deteriorated element and the degree of smoothing of the surface portion acquired in advance. The deterioration factor exposure amount of the resin material 1 is measured, and the progress of the deterioration of the synthetic resin material 1 is estimated.
For the measurement of the degree of smoothing of the surface portion 1a, it is desirable to measure the specular glossiness based on JIS Z 8741. Specifically, the specular glossiness of the surface portion 1a can be measured at the installation site of the synthetic resin material 1 using a handy gloss meter [for example, IG-320 manufactured by Horiba, Ltd.]. desirable. The specular gloss includes 85 ° specular gloss, 75 ° specular gloss, 60 ° specular gloss, 45 ° specular gloss, 20 ° specular gloss, etc. In the present invention, 60 ° specular gloss is adopted. doing.

  The measurement of the degree of smoothing of the surface portion 1a of the synthetic resin material 1 may measure haze based on JIS K 7136. However, when measuring haze, the synthetic resin material 1 is limited to a transparent one. There is a restriction that In this respect, in the case of specular gloss, since it is measured using the reflected light from the light source of the gloss meter, it can be measured even on the surface portion 1a of the opaque or non-translucent synthetic resin material 1, and is described above on site. In addition to being able to measure easily using the handy-type glossiness meter, there is the advantage that it is less susceptible to optical influences in the field and can be measured accurately.

  It should be noted that the degree of smoothing of the surface portion 1a of the synthetic resin material 1 is simply determined by visual observation, or changes in the form of characters and figures represented by the fine irregularities 2 of the surface portion 1a (for example, it becomes difficult to distinguish characters). However, in these cases, it is difficult to accurately measure the exposure amount of the deteriorated element because numerical data cannot be obtained.

The measurement of the exposure amount of the deterioration element of the synthetic resin material 1 is performed based on data representing the correlation between the exposure amount of the deterioration element acquired in advance and the degree of smoothing of the surface portion 1a.
Table 2 below shows an example of data representing such a correlation. The ten-point average roughness Rz measured by the laser confocal method is 83.5 μm (the tenth measured by the stylus method). A super-accelerated weathering test [exposure test of light / condensation cycle using an i-super UV tester manufactured by Iwasaki Electric Co., Ltd.] was performed on a polycarbonate resin plate with fine irregularities with a surface roughness of 23 μm. Before exposure, after 120 hours exposure, after 240 hours exposure, after 360 hours exposure, after 480 hours exposure, ten point average roughness Rz measured by laser confocal method and ten points measured by stylus method The average roughness Rz, the specular gloss, and the haze are shown.
The specular gloss is a value of 60 degree specular gloss measured based on JIS Z 8741, and the haze is a value measured based on JIS K 7136.

  If the data showing the correlation between the deterioration factor exposure amount (exposure time) as shown in Table 2 and the specular gloss and haze is acquired in advance, it can be obtained from the polycarbonate resin exposed to the deterioration element outdoors or indoors. The surface of the synthetic resin material 1 having a fine unevenness with a 10-point average roughness Rz measured by a laser confocal method of 83.5 μm (a 10-point average roughness Rz measured by a stylus method of 23 μm) , The specular glossiness is measured with a handy type glossiness meter, and if the specular glossiness is 105, for example, it can be determined that there is an exposure amount for 360 hours. If the haze is measured as 2.5%, it can be measured that there is an exposure amount for 360 hours. Then, by examining various deterioration element exposure amounts (time) corresponding to the use limit due to deterioration of the synthetic resin material 1, for example, if it is determined in advance that the exposure amount of 480 hours corresponds to the use limit, this 360 hour time Since it is immediately known that the deterioration of the exposed synthetic resin material 1 has progressed to about 3/4 of the use limit, it is possible to estimate the replacement time of the new synthetic resin material 1 and the like.

Moreover, if a calibration curve showing the correlation between the deterioration element exposure amount (exposure time), the specular glossiness and the haze is prepared based on the data of Table 2, all the values within the range of 60 to 120 are prepared. It becomes possible to measure the exposure amount (time) corresponding to the specular gloss and the exposure amount (time) corresponding to all hazes in the range of 28.4 to 2.2%.
In addition, the data showing the correlation in Table 2 can measure the rough exposure amount because the interval of exposure amount (time) is quite large, but the correlation data with a narrower interval of exposure amount (time). Can be used to accurately measure the amount of exposure.

  Further, when the measurement piece 3 made of polycarbonate resin is attached to the surface portion of various synthetic resin materials 1, the specular gloss of the surface of the measurement piece 3 is measured in the same manner as described above, and the synthetic resin material 1. Although the amount of deterioration factor exposure can be measured, the degree of progress of deterioration of synthetic resin material 1 varies greatly depending on the type of synthetic resin even if the exposure amount is the same. It is necessary to determine the exposure amount of the corresponding deterioration element in advance and to estimate the progress of deterioration based on the exposure amount.

  As can be understood from the above description, the method for measuring the degradation factor exposure of the synthetic resin material according to the present invention is the degradation of the synthetic resin material (current material) while ensuring the above-mentioned directness, non-destructive property, and on-site performance. A useful invention that measures the element exposure by a simple means of measuring the degree of smoothing of the surface part of the current material, and has an excellent effect of being able to immediately estimate the degree of deterioration of the synthetic resin material. It is.

DESCRIPTION OF SYMBOLS 1 Synthetic resin material 1a Surface part 2 Fine unevenness 3 Measurement piece

Claims (5)

  Forming fine irregularities on the surface portion of the synthetic resin material, exposing the synthetic resin material to the deteriorated element, measuring the degree of smoothing of the surface portion, and measuring the exposure amount of the deteriorated element A method for measuring the amount of exposure of deteriorated elements of synthetic resin.   The deterioration element exposure measurement method according to claim 1, wherein the surface portion is made of a polycarbonate resin.   3. The deterioration element exposure according to claim 1, wherein the fine unevenness of the surface portion is formed by attaching a measurement piece having fine unevenness on the surface to the surface portion. Quantity measuring method.   The ten-point average roughness Rz (ten-point average roughness Rz measured in a non-contact manner by a laser confocal method) of the fine irregularities on the surface portion is 40 to 200 μm. Deterioration factor exposure measurement method according to any of the above.   5. The degradation element exposure measurement method according to claim 1, wherein the means for measuring the degree of smoothing of the surface portion is measurement based on specular gloss.