JP2007119613A - Transparent resin sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transparent resin sheet which is excellent in a suppressing effect preventing insects from coming flying, is excellent also in visibility and does not have bad influence on work environment. <P>SOLUTION: The sheet comprises, based on the 100 pts.wt. of a transparent thermoplastic resin, 0.01-1 pt.wt. of an ultraviolet absorber, and 0.01-1 pt.wt. of a fluorescent brightening agent. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a transparent resin sheet, and more particularly to a transparent resin sheet that has an excellent insect flying suppression effect and does not appear to be colored by human eyes.

  Transparent resin sheets made of thermoplastic resins are used in a wide range of fields, and are also used as machine covers and partition materials for factories by making use of transparency.

  When used as a mechanical cover or the like, insects fly in response to a fluorescent lamp or the like provided inside the cover, which often becomes a problem in quality control of products manufactured there.

  In general, insects have a characteristic of collecting light in the ultraviolet region, that is, light mainly having a wavelength of about 300 to 410 nm with a peak at about 360 nm, and a method for suppressing insects by blocking light in this region has been proposed. . For example, an ultraviolet absorber is used to block light having a wavelength of 380 nm or less (Patent Document 1), or light having a wavelength of 380 nm or less is blocked, and a yellow or orange colorant is used to prevent light having a wavelength of 400 nm or more For example, one that suppresses transmission of light having a wavelength (Patent Document 2).

However, in the above method, the insect flying suppression effect in the wavelength region exceeding 380 nm is insufficient, or it is inferior in visibility because it is colored yellow or orange, and the mental fatigue of the worker increases. There was a problem that the working environment became worse.
JP 55-023921 JP-A 62-278931

  An object of the present invention is to provide a transparent resin sheet that solves the above-described problems, has an excellent insect flying suppression effect, has excellent visibility, and does not adversely affect the work environment.

  The present inventor has found that the above object can be achieved by adding an ultraviolet absorber and a fluorescent whitening agent to a transparent thermoplastic resin. That is, the present invention consists of a resin composition containing 0.01 to 1 part by weight of an ultraviolet absorber and 0.01 to 1 part by weight of a brightening agent with respect to 100 parts by weight of a transparent thermoplastic resin, and is 410 nm or less. The gist of the present invention is a transparent resin sheet characterized by blocking light having a wavelength of 5 nm.

  As described above, the transparent resin sheet of the present invention is composed of a composition in which a transparent thermoplastic resin contains a specific amount of an ultraviolet absorber and a fluorescent brightening agent, and light having a wavelength of 410 nm or less is blocked. As a result, the wavelength range of light with which insects react is more widely limited than when the conventional UV absorbers block light with a wavelength of up to about 380 nm, thereby improving the insect flying suppression effect. . Further, the transparent resin sheet of the present invention is not colored, has excellent visibility, does not adversely affect the work environment, and can be suitably used for machine covers, partition materials, etc. in factories.

  The transparent thermoplastic resin of the present invention comprises, for example, polyethylene terephthalate, amorphous polyester (a dicarboxylic acid component made of terephthalic acid, and a diol component made of 1,4-cyclohexanedimethanol and ethylene glycol. Polyester resin), polycarbonate, polymethyl methacrylate, polystyrene, polyvinyl chloride and the like can be arbitrarily selected.

  As an ultraviolet absorber, it can select arbitrarily from well-known things, such as a benzotriazole type, a benzophenone type, a salicylic acid type, and a cyanoacrylate type.

  As the fluorescent brightening agent, known compounds such as coumarin compounds and benzoxazole compounds can be used. Examples of coumarin compounds include 3-phenyl-7-aminocoumarin, 3-phenyl-7- (imino-1′3′5′-triazine-2′-diethylamino-4′-chloro) -coumarin, 3-phenyl- 7- (Imino-1′3′5′-triazine-2′-diethylamino-4′-methoxy) -coumarin, 3-phenyl-7- (2H-naphth (1,2-d) -triazol-2-yl ) Coumarin, 4-methyl-7-hydroxy-coumarin and the like. Examples of benzoxazole compounds include 2,5-thiophenediyl (5-tert-butyl-1,3-benzoxazole), 4,4'-bis (benzoxazol-2-yl) stilbene, 4- (benzo And oxazol-2-yl) -4 ′-(5-methylbenzoxazol-2-yl) stilbene and 4,4′-bis (benzoxazol-2-yl) furan. These optical brighteners may be used alone or in combination of two or more.

  The ultraviolet absorber shields light in the ultraviolet region having a wavelength of up to 380 nm. By using this in combination with a fluorescent brightening agent, light having a wavelength of up to about 410 nm can be shielded. Here, it is necessary to add 0.01 to 1 part by weight of the ultraviolet absorber and the fluorescent brightening agent to 100 parts by weight of the transparent thermoplastic resin. When the added amount of the ultraviolet absorber is less than 0.01 parts by weight, light having a wavelength of 380 nm or less cannot be sufficiently blocked. Moreover, even if it adds exceeding 1 weight part, the improvement of an ultraviolet-ray absorption performance is not seen. On the other hand, if the amount of the fluorescent brightener added is less than 0.01 parts by weight, light having a wavelength of 380 nm to 410 nm cannot be sufficiently blocked. Moreover, even if it adds exceeding 1 weight part, the improvement of the light shielding effect in this wavelength range is not seen.

  The transparent resin sheet of the present invention is obtained by forming a resin composition in which an ultraviolet absorber and a fluorescent brightening agent are blended into a transparent thermoplastic resin into a sheet shape by a known molding method such as extrusion molding, calendar molding, press molding or the like. Can be obtained.

The raw materials used are as follows.
Transparent thermoplastic resin:
(A) Amorphous polyester (a polyester resin composed of a dicarboxylic acid component composed of terephthalic acid and a diol component composed of 1,4-cyclohexanedimethanol and ethylene glycol), trade name “EASTMAN 6663” , Manufactured by EASTMAN Chemical (b) Polycarbonate, trade name “Caliver 300-4”, manufactured by Sumitomo Dow

UV absorber: benzotriazole (2- (5-methyl-2-hydroxyphenyl) benzotriazole), trade name “TINUVIN P”, manufactured by Ciba Specialty Chemicals

Optical brightener: benzoxazole (4,4′-bis (benzoxazol-2-yl) stilbene), trade name “UVITEX OB-ONE”, manufactured by Ciba Specialty Chemicals

<Examples 1-3, Comparative Examples 1-2>
Using (a) above as the thermoplastic resin, the ultraviolet absorber and the fluorescent brightening agent were mixed at the blending ratio shown in Table 1 (the values in the table indicate parts by weight relative to 100 parts by weight of the thermoplastic resin), and extruded. By molding, a transparent sheet having a thickness of 5 mm was obtained. About the obtained sample sheet | seat, the maximum transmittance | permeability in the wavelength range of 300-410 nm was confirmed with the spectrophotometer made from Ocean Optics. The results are shown in Table 1 as “maximum transmittance”.

  Moreover, the effect of the insect flying suppression was evaluated as follows. Each of the above sample sheets having a size of 500 mm × 500 mm is provided in front of a fluorescent lamp for a 15 W insect trap, and an apparatus provided with an adhesive sheet of 300 mm × 130 mm for capturing flying insects in front of this sample sheet is provided outdoors. installed. The above fluorescent lamps were turned on from the evening to the night, and the number of insects captured was counted. Separately, a transparent resin sheet (referred to as a blank sheet) not containing an ultraviolet absorber and a fluorescent brightening agent was prepared, and the number of insects captured was counted in the same manner as described above. From this result, the effect of inhibiting insect flying is shown in Table 1 as “insect flying inhibition rate” (1- (number of insects captured in each sample sheet / number of insects captured in the blank sheet)).

<Example 4>
Using (b) as a thermoplastic resin, a sample sheet was obtained and evaluated in the same manner as in the above example.

  As is apparent from Table 1, in Examples 1 to 4 according to the present invention, the light is sufficiently blocked in the range of 380 to 410 nm, which is the main wavelength region where insects fly, and excellent insect flying suppression is achieved. Shows the effect. On the other hand, in Comparative Examples 1 and 2 that depart from the technical scope of the present invention, light blocking is insufficient, and as a result, insect flying cannot be sufficiently suppressed.

Claims (1)

  It consists of a resin composition containing 0.01 to 1 part by weight of an ultraviolet absorber and 0.01 to 1 part by weight of a brightening agent for 100 parts by weight of a transparent thermoplastic resin, and blocks light with a wavelength of 410 nm or less. A transparent resin sheet characterized by: