JP6352170B2 - Translucent member and manufacturing method thereof - Google Patents

Description

  The present invention relates to a translucent member and a manufacturing method thereof.

  Conventionally, various types of translucent members used for illumination device covers and the like have been proposed. For example, Patent Document 1 proposes a non-combustible lighting cover made of a laminate including a polytetrafluoroethylene resin-impregnated glass cloth sheet, a hot-melt moldable fluorine-containing resin layer, a glass cloth and polycarbonate.

JP 2007-220561 A

  However, since the laminated body proposed in Patent Document 1 is laminated with a polycarbonate layer sandwiched between two glass cloth layers, there is a problem that moire fringes are generated on the surface of the lighting cover.

  The present invention has been made to solve the above problems, and provides a translucent member that is excellent in light transmissivity and does not generate moire fringes, and a method for manufacturing the translucent member.

The translucent member of the present invention is a translucent member comprising a laminate including a synthetic resin layer and glass cloth bonded to both surfaces of the synthetic resin layer, and the synthetic resin forming the synthetic resin layer When the MI value is 50 or more, the refractive index of the synthetic resin layer is n _P , and the refractive index of the glass cloth is n _G , the value of | n _P −n _G | is 0.07 or less. It is characterized by being.

The first method for producing a translucent member of the present invention includes a step of forming a laminate by arranging glass cloth on both surfaces of a synthetic resin sheet made of a synthetic resin having an MI value of 50 or more, and the laminate the by thermocompression bonding, the synthetic resin sheet and includes a step of bonding the glass cloth, the refractive index of the synthetic resin sheet n _P, if the refractive index of the glass cloth was n _G, | n _P The value of −n _G | is 0.07 or less.

Moreover, the 2nd manufacturing method of the translucent member of this invention apply | coats the coating material containing a silicone resin and a silica particle on the single side | surface of a 1st glass cloth, and silicone is applied to the surface of the said 1st glass cloth. A step of forming a resin coating layer, a step of heating the silicone resin coating layer to form a silicone resin layer on the surface of the first glass cloth, and a synthetic resin sheet made of a synthetic resin having an MI value of 50 or more. A glass cloth side of the first glass cloth on which the silicone resin layer is formed is disposed on one surface, and a second glass cloth is disposed on the other surface of the synthetic resin sheet to form a laminate. a step, the laminate by thermal bonding, the first glass cloth, and a step of bonding the synthetic resin sheet and the second glass cloth, the refractive index n _P of the synthetic resin sheet, the If the refractive index of Rasukurosu was _{n G, | n P -n G} | value, characterized in that it is 0.07 or less.

  According to the present invention, it is possible to provide a light-transmitting member that has excellent light transmittance, does not generate moire fringes, and has rigidity.

FIG. 1 is a schematic cross-sectional view showing an example of the translucent member of the present invention. FIG. 2 is a schematic cross-sectional view showing another example of the translucent member of the present invention. FIG. 3 is a perspective view showing an example of a state in which the translucent member of the present invention is molded. FIG. 4 is a front view showing an example of a state where the translucent member of the present invention is molded.

(Translucent member of the present invention)
First, the translucent member of the present invention will be described. The translucent member of this invention is formed from the laminated body provided with the synthetic resin layer and the glass cloth joined to both surfaces of the said synthetic resin layer. Further, the MI value of the synthetic resin forming the synthetic resin layer is set to 50 or more, and although there is no limitation on the upper limit, it is usually set to 70 or less. The MI value is more preferably 60 or more and 65 or less. Further, when the refractive index of the synthetic resin layer is n _P and the refractive index of the glass cloth is n _G , the value of | n _P −n _G | is set to 0.07 or less, and 0.03 or less. More preferred.

  Since the translucent member of the present invention includes the synthetic resin layer and the glass cloth, it has rigidity.

In the translucent member of the present invention, the synthetic resin forming the synthetic resin layer has an MI value of 50 or more, more preferably 60 or more and 65 or less, and the refractive index of the synthetic resin layer and the glass Since the value of | n _P −n _G |, which is the difference from the refractive index of the cloth, is set to 0.07 or less, more preferably 0.03 or less, the light transmission is excellent and moire fringes do not occur.

  Here, the MI value means a melt index value that is an index representing the fluidity of a synthetic resin measured by a method defined in Japanese Industrial Standard (JIS) K7210.

That is, since the MI value of the synthetic resin forming the synthetic resin layer is set to 50 or more, more preferably 60 to 65, the adhesiveness between the synthetic resin layer and the glass cloth is excellent. There is no air layer between the layer and the glass cloth. Here, when the refractive index of the air layer is n _A , the following relational expression (1) is usually established.
n _P ≈n _G > n _A (1)

  Therefore, if an air layer exists between the synthetic resin layer and the glass cloth, the refractive index changes greatly between the synthetic resin layer and the glass cloth, the light transmittance is lowered, and moire fringes are generated. To do.

On the other hand, in the translucent member of the present invention, the air layer is not generated, and the value of | n _P −n _G | is set to 0.07 or less, more preferably 0.03 or less. The refractive index does not change greatly between the synthetic resin layer and the glass cloth, the light transmittance is improved, and moire fringes are not generated.

  In the present invention, the refractive index is measured according to the method of obtaining the refractive index of plastic as defined in JIS K7142.

  As the synthetic resin, a thermoplastic resin or a thermosetting resin can be used as long as it has an MI value of 50 or more, more preferably 60 or more and 65 or less. A plastic resin is preferred.

  The thermoplastic resin is not particularly limited as long as it has an MI value of 50 or more and high light transmittance. For example, polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS) ), Polyethylene terephthalate (PET), polyphenylene ether (PPE), polyamide (PA), ABS resin, acrylic resin, and the like. Of these, polycarbonate is particularly preferred. This is because polycarbonate is excellent in light transmittance, and has excellent strength and moldability.

  Although the thickness of the said synthetic resin layer is not specifically limited, In order not to reduce the total light transmittance of the translucent member of this invention, it is preferable to set it as 150 micrometers-250 micrometers.

The glass cloth used for the translucent member of the present invention is not particularly limited as long as it has translucency. However, in order not to reduce the total light transmittance of the translucent member of the present invention, the basis weight is 100 g. A glass cloth of / m ^{2 to} 300 g / m ² is preferable.

  Further, the glass cloth is preferably subjected to a coupling treatment in order to increase the bonding strength with the synthetic resin layer. As said coupling process, the silane coupling process using a silane coupling agent is preferable. As said silane coupling agent, epoxy silanes, aminosilanes, chlorosilanes, vinylsilanes, (meth) acrylsilanes etc. can be used, for example.

  Moreover, it is not specifically limited as glass fiber used for the said glass cloth, For example, glass fiber which consists of E glass, D glass, T glass, C glass, ECR glass, A glass, L glass, S glass, H glass, etc. Can be used.

  In the translucent member of the present invention, it is preferable that a silicone resin layer is further bonded to at least one surface of the laminate. By joining the silicone resin layer, when the synthetic resin of the synthetic resin layer melts during overheating, the outflow can be suppressed by the silicone resin layer, and the translucent member of the present invention is a non-flammable member. It can be. Specifically, the translucent member of the present invention having the silicone resin layer is, for example, described in “Technology related to railways” described in the Ministry of Land, Infrastructure, Transport and Tourism “JNR 124” issued on December 27, 2004. It is possible to comply with the non-combustible standards applicable to passenger car and ceiling materials shown in Article 83 of “Partial revision of interpretation standards such as ministerial ordinances that establish standards for

  In order to further improve the nonflammability of the translucent member of the present invention, the silicone resin layer is preferably bonded to both surfaces of the laminate constituting the translucent member of the present invention.

  The silicone resin layer preferably contains silica particles. When the silicone resin layer contains silica particles, the heat resistance of the silicone resin layer can be improved. The average particle diameter of the primary particles of the silica particles is preferably 6 nm or more and 100 nm or less.

The silica particles are preferably fumed silica, and the specific surface area of the fumed silica by the BET method is preferably 100 m ² / g or more and 300 m ² / g or less. The fumed silica may be hydrophilic or hydrophobic.

  Although the translucent member of this invention changes with the uses, it is preferable that the total light transmittance is 30 to 80% normally. Here, in this specification, the total light transmittance is based on “Optical characteristic test of plastic” of JIS K7105, using a light transmittance measuring device “Hazeguard II” (trade name) manufactured by Toyo Seiki Seisakusho. And the value measured.

  The shape of the translucent member of the present invention is not particularly limited and can be used as a sheet-like translucent member, but the sheet-like translucent member may be further molded according to its use to have various shapes. can do. For example, the shape may be a semi-cylindrical shape, a dome shape, a ball shape, an umbrella shape, a box shape, or the like.

Hereinafter, the translucent member of the present invention will be described based on the drawings. FIG. 1 is a schematic cross-sectional view showing an example of the translucent member of the present invention. In FIG. 1, the translucent member 10 of this invention is equipped with the synthetic resin layer 11 and the glass cloths 12 and 13 joined to the both surfaces. The thickness of the synthetic resin layer 11 is set to 150 μm to 250 μm, for example, so as not to reduce the total light transmittance of the translucent member 10 of the present invention. Also, the basis weight of the glass cloth 12 and 13 is set so as not to lower the total light transmittance of the light-transmitting member 10 of the present invention, for example, ^{100g / m 2 ~300g / m 2} .

  The synthetic resin layer 11 is formed of a synthetic resin having an MI value of 50 or more, more preferably 60 or more and 65 or less. Further, the difference between the refractive index of the synthetic resin layer 11 and the refractive indexes of the glass cloths 12 and 13 is set to 0.07 or less, more preferably 0.03 or less. For this reason, the translucent member 10 is excellent in light transmittance, and moire fringes do not occur.

  Usually, since the glass cloths 12 and 13 use the same material, the refractive indexes thereof are the same. However, when the glass cloths 12 and 13 have different refractive indexes, the refractive index of the synthetic resin layer 11 and the glass cloths 12 and 13 are different. It is sufficient that the difference between the respective refractive indexes of 13 is 0.07 or less, more preferably 0.03 or less.

  FIG. 2 is a schematic cross-sectional view showing another example of the translucent member of the present invention. In FIG. 2, the translucent member 20 of the present invention includes a synthetic resin layer 11, glass cloths 12 and 13 bonded to both surfaces thereof, and a silicone resin layer 14 bonded to the glass cloth 12. The translucent member 20 of the present invention is obtained by further bonding a silicone resin layer 14 to the translucent member 10 of the present invention shown in FIG. 1, and light is transmitted in the same manner as the translucent member 10 shown in FIG. Excellent transparency and no moire fringes. Furthermore, since the translucent member 20 of the present invention includes the silicone resin layer 14, nonflammability is also improved.

  As described above, the translucent member of the present invention has rigidity, is excellent in light transmissivity, does not generate moire fringes, and can also be provided with nonflammability. It can be suitably used as a lighting cover that requires nonflammability, such as a lighting cover.

(Method for producing translucent member of the present invention)
Next, the 1st and 2nd manufacturing method of the translucent member of this invention is demonstrated.

First, in the first method for producing a translucent member of the present invention, a laminated body is formed by arranging glass cloth on both surfaces of a synthetic resin sheet made of a synthetic resin having an MI value of 50 or more, more preferably 60 or more and 65 or less. A step of forming, and a step of bonding the synthetic resin sheet and the glass cloth by thermocompression bonding the laminate. When the refractive index of the synthetic resin sheet is n _P and the refractive index of the glass cloth is n _G , the value of | n _P −n _G | is 0.07 or less, more preferably 0.03 or less. Is set.

In the first method for producing a translucent member of the present invention, the synthetic resin forming the synthetic resin sheet has an MI value of 50 or more, more preferably 60 or more and 65 or less, and the refractive index of the synthetic resin sheet. The value of | n _P −n _G |, which is the difference between the refractive index of the glass cloth and the glass cloth, is set to 0.07 or less, more preferably 0.03 or less. The translucent member which does not generate | occur | produce can be manufactured. Moreover, since the translucent member manufactured with the manufacturing method of the said invention is equipped with the synthetic resin sheet and the glass cloth, it has rigidity.

  As said synthetic resin sheet, the sheet | seat consisting of the synthetic resin demonstrated by the translucent member of the above-mentioned this invention can be used. Moreover, the glass cloth demonstrated with the translucent member of the above-mentioned this invention can also be used for the said glass cloth.

  Although the method of the said thermocompression bonding is not specifically limited, For example, the method using a hot roll, the method by a hot press, etc. can be used. Moreover, the temperature at the time of thermocompression bonding should just be the temperature more than the glass transition temperature of the synthetic resin used for the said synthetic resin sheet, for example, should just be 200 to 300 degreeC. Moreover, the pressure at the time of thermocompression bonding will not be specifically limited if it can pressurize uniformly to the whole surface of the said translucent member. Also, the time for thermocompression bonding is not particularly limited, but may be, for example, 1 minute or more and 10 minutes or less.

  Next, the 1st manufacturing method of the translucent member of this invention is demonstrated using FIG.

  First, as shown in FIG. 1, the first glass cloth 12 and the second glass cloth 13 are arranged on both surfaces of the synthetic resin sheet 11 having an MI value of 50 or more, more preferably 60 or more and 65 or less. Form. Next, the laminated body is subjected to thermocompression bonding, and the synthetic resin sheet 11 and the glass cloths 12 and 13 are joined to produce the translucent member 10. Although the method of the said thermocompression bonding is not specifically limited, For example, it can thermocompression-bond by passing the said laminated body through a hot roll etc.

  Moreover, the translucent member 10 produced by the above can also be processed into various shapes by subsequent molding or the like.

Next, in the second manufacturing method of the translucent member of the present invention, a coating material containing a silicone resin and silica particles is applied to one surface of the first glass cloth, and the surface of the first glass cloth is applied. A step of forming a silicone resin coating layer, a step of heating the silicone resin coating layer to form a silicone resin layer on the surface of the first glass cloth, and an MI value of 50 or more, more preferably 60 or more and 65 or less. The glass cloth side of the first glass cloth on which the silicone resin layer is formed is disposed on one surface of a synthetic resin sheet made of the above synthetic resin, and the second glass cloth is disposed on the other surface of the synthetic resin sheet. Disposing and forming a laminated body, and thermocompression bonding the laminated body to join the first glass cloth, the synthetic resin sheet and the second glass cloth. If the refractive index of the resin sheet was n _P, the refractive index of the glass cloth and _{n G, | n P -n G} | value, 0.07 or less, and more preferably set to 0.03 or less .

In the second method for producing a translucent member of the present invention, the synthetic resin forming the synthetic resin sheet has an MI value of 50 or more, more preferably 60 or more and 65 or less, and the refractive index of the synthetic resin sheet. The value of | n _P −n _G |, which is the difference between the refractive index of the glass cloth and the glass cloth, is set to 0.07 or less, more preferably 0.03 or less. The translucent member which does not generate | occur | produce can be manufactured. Moreover, since the translucent member manufactured with the manufacturing method of the said invention is equipped with the synthetic resin sheet and the glass cloth, it has rigidity.

The silica particles contained in the coating material are added as a thickener that adjusts the viscosity of the coating material. If the viscosity of the coating material is too low, the coating material cannot be held on the surface of the first glass cloth when applied to the first glass cloth. From this viewpoint, the silica particles are preferably fumed silica, and the specific surface area of the fumed silica by the BET method is preferably 100 m ² / g or more and 300 m ² / g or less.

  The coating material usually contains a solvent or the like. This is because the silica particles are uniformly dispersed in the silicone resin.

  The heating temperature of the silicone resin coating layer may be a temperature at which the solvent contained in the silicone resin coating layer can be removed, and may be, for example, 100 ° C. or more and 350 ° C. or less. Further, the heating time is not particularly limited, and may be, for example, 15 minutes or more and 60 minutes or less.

  About the method of the said thermocompression bonding, the method similar to the 1st manufacturing method of the above-mentioned translucent member is employable. Moreover, as the synthetic resin sheet, a sheet made of the synthetic resin described in the above-described translucent member of the present invention can be used. Furthermore, the glass cloth demonstrated with the translucent member of the above-mentioned this invention can also be used for the said 1st and 2nd glass cloth.

  The 2nd manufacturing method of the translucent member of the said invention can further be equipped with the process of shape | molding the said laminated body which carried out thermocompression bonding. Thereby, a translucent member having various shapes such as a semi-cylindrical shape, a dome shape, a ball shape, an umbrella shape, and a box shape can be manufactured.

  Next, the 2nd manufacturing method of the translucent member of this invention is demonstrated using FIG.

  First, a coating material containing a silicone resin and silica particles is applied to one surface of the first glass cloth 12 to form a silicone resin coating layer on the surface of the first glass cloth 12. Thereafter, the silicone resin coating layer is heated to form the silicone resin layer 14 on the surface of the first glass cloth 12. Next, the glass cloth side of the first glass cloth 12 on which the silicone resin layer 14 is formed is disposed on one surface of the synthetic resin sheet 11 made of a synthetic resin having an MI value of 50 or more, more preferably 60 or more and 65 or less. Further, the second glass cloth 13 is disposed on the other surface of the synthetic resin sheet 11 to form a laminate. Next, the laminated body is subjected to thermocompression bonding, and the first glass cloth 12, the synthetic resin sheet 11, and the second glass cloth 13 are joined to produce the translucent member 20.

  Although the method of the said thermocompression bonding is not specifically limited, For example, it can thermocompression-bond by passing the said laminated body through a hot roll etc.

  Furthermore, it is possible to perform molding after heating the translucent member 20 produced as necessary. Through the molding process, various shapes of translucent members can be manufactured. The heating temperature is not particularly limited as long as the translucent member is softened. Moreover, the method of the said shaping | molding process is not limited, either, It can carry out by a hot press process etc.

  FIG. 3 is a perspective view showing an example of the state after molding the translucent member 20 produced above, and FIG. 4 shows the state after molding the translucent member 20 produced above. It is a front view which shows an example. 3 and 4, the translucent member 20 includes a semi-cylindrical portion 21 and a flange portion 22. The molded translucent member 20 can be suitably used as an illumination cover that requires nonflammability, such as a vehicle illumination cover and a building illumination cover.

  Hereinafter, the present invention will be described with reference to examples. However, the present invention is not limited to the following examples.

Example 1
First, a glass cloth (refractive index: 1.55) having a thickness of 0.175 mm is disposed on both sides of a polycarbonate sheet (MI value: 65, refractive index: 1.58) having a thickness of 0.2 mm, and a laminate is obtained. Produced.

  Next, the laminate was thermocompression bonded through a heat roll set at a temperature of 260 ° C., and a light-transmissive member of Example 1 was produced.

(Example 2)
A translucent member of Example 2 was produced in the same manner as Example 1 except that the MI value of the polycarbonate sheet was changed to 56.

(Example 3)
Fumed by Nippon Aerosil Co., Ltd. was added to 93 parts by weight of a solution in which silicone resins “KE-106” (trade name) and “KR-255” (trade name) manufactured by Shin-Etsu Chemical Co., Ltd. were mixed at a weight ratio of 1: 1. 7 parts by weight of silica “AEROSIL RX-200” (trade name, BET specific surface area: 140 m ² / g) was added and stirred to prepare a mixed solution. Next, 10 parts by weight of a curing agent “CAT-RG” (trade name) manufactured by Shin-Etsu Chemical Co., Ltd. with respect to 100 parts by weight of the silicone resin “KE-106” is added to the mixed solution and stirred. A containing coating material was prepared. Next, after applying the silicone resin-containing coating material on one surface of the first glass cloth (refractive index: 1.55) to form a silicone resin coating layer, the silicone resin is dried at a temperature of 150 ° C. for 30 minutes. The resin coating layer was cured. Thereafter, the silicone resin coating layer was further heated at a temperature of 300 ° C. for 15 minutes to form a silicone resin layer having a thickness of 50 μm on the surface of the first glass cloth. Next, the glass cloth side of the first glass cloth on which the silicone resin layer is formed is disposed on one surface of a polycarbonate sheet having a thickness of 0.2 mm (MI value: 65, refractive index: 1.58), and A second glass cloth (refractive index: 1.55) was placed on the other surface of the polycarbonate sheet to produce a laminate.

  Next, the laminated body was passed through a heat roll set at a temperature of 260 ° C. and thermocompression bonded, so that a light transmissive member of Example 3 was produced.

Example 4
The translucent member of Example 4 in the same manner as in Example 3 except that the mixing ratio of the silicone resins “KE-106” and “KR-255” manufactured by Shin-Etsu Chemical Co., Ltd. was changed to 2: 1 by weight. Was made.

(Example 5)
The translucent member of Example 5 in the same manner as in Example 3 except that the mixing ratio of the silicone resins “KE-106” and “KR-255” manufactured by Shin-Etsu Chemical Co., Ltd. was changed to 3: 1. Was made.

(Example 6)
The translucent member of Example 6 in the same manner as in Example 3 except that the mixing ratio of the silicone resins “KE-106” and “KR-255” manufactured by Shin-Etsu Chemical Co., Ltd. was changed to 1: 2. Was made.

(Example 7)
A fumed silica “AEROSIL 200” (trade name) manufactured by Nippon Aerosil Co., Ltd. was added to 90 parts by weight of a mixture of silicone resins “KE-106” and “KR-255” manufactured by Shin-Etsu Chemical Co., Ltd. in a weight ratio of 1: 1. , BET specific surface area: 200 m ² / g) was added and stirred to prepare a mixed solution. Next, 10 parts by weight of a curing agent “CAT-RG” manufactured by Shin-Etsu Chemical Co., Ltd. is added to 100 parts by weight of the silicone resin “KE-106” to the mixed solution and stirred to obtain a silicone resin-containing coating material. Prepared. A translucent member of Example 7 was produced in the same manner as Example 3 except that the silicone resin-containing coating material was used.

(Example 8)
A fumed silica “AEROSIL 300” manufactured by Nippon Aerosil Co., Ltd. (trade name) was added to 90 parts by weight of a mixture of silicone resins “KE-106” and “KR-255” manufactured by Shin-Etsu Chemical Co., Ltd. at a weight ratio of 1: 1. , BET specific surface area: 300 m ² / g) was added and stirred to prepare a mixed solution. Next, 10 parts by weight of a curing agent “CAT-RG” manufactured by Shin-Etsu Chemical Co., Ltd. is added to 100 parts by weight of the silicone resin “KE-106” to the mixed solution and stirred to obtain a silicone resin-containing coating material. Prepared. A translucent member of Example 8 was produced in the same manner as Example 3 except that the silicone resin-containing coating material was used.

Example 9
A fumed silica “AEROSIL R974” manufactured by Nippon Aerosil Co., Ltd. (trade name) is added to 95 parts by weight of a mixture of silicone resins “KE-106” and “KR-255” manufactured by Shin-Etsu Chemical Co., Ltd. in a weight ratio of 1: 1. , BET specific surface area: 170 m ² / g) was added and stirred to prepare a mixed solution. Next, 10 parts by weight of a curing agent “CAT-RG” manufactured by Shin-Etsu Chemical Co., Ltd. is added to 100 parts by weight of the silicone resin “KE-106” to the mixed solution and stirred to obtain a silicone resin-containing coating material. Prepared. A translucent member of Example 9 was produced in the same manner as Example 3 except that the silicone resin-containing coating material was used.

(Example 10)
A fumed silica “AEROSIL RY-200” manufactured by Nippon Aerosil Co., Ltd. was added to 95 parts by weight of a mixture of silicone resins “KE-106” and “KR-255” manufactured by Shin-Etsu Chemical Co., Ltd. at a weight ratio of 1: 1. 5 parts by weight of a trade name, BET specific surface area: 100 m ² / g) was added and stirred to prepare a mixed solution. Next, 10 parts by weight of a curing agent “CAT-RG” manufactured by Shin-Etsu Chemical Co., Ltd. is added to 100 parts by weight of the silicone resin “KE-106” to the mixed solution and stirred to obtain a silicone resin-containing coating material. Prepared. A translucent member of Example 10 was produced in the same manner as Example 3 except that the silicone resin-containing coating material was used.

(Example 11)
Silica particles “Sun Lovely C” (product of AGC S-Tech) are added to 60 parts by weight of a solution in which silicone resins “KE-106” and “KR-255” manufactured by Shin-Etsu Chemical Co., Ltd. are mixed at a weight ratio of 1: 1. Name, BET specific surface area: 50 to 300 m ² / g) was added and stirred to prepare a mixed solution. Next, 10 parts by weight of a curing agent “CAT-RG” manufactured by Shin-Etsu Chemical Co., Ltd. is added to 100 parts by weight of the silicone resin “KE-106” to the mixed solution and stirred to obtain a silicone resin-containing coating material. Prepared. A translucent member of Example 11 was produced in the same manner as Example 3 except that the silicone resin-containing coating material was used.

(Example 12)
Silica particles “CMC-20” (manufactured by Potters Barotini) were added to 60 parts by weight of a solution in which silicone resins “KE-106” and “KR-255” manufactured by Shin-Etsu Chemical Co., Ltd. were mixed at a mass ratio of 1: 1. 40 parts by weight of a product name) was added and stirred to prepare a mixed solution. Next, 10 parts by weight of a curing agent “CAT-RG” manufactured by Shin-Etsu Chemical Co., Ltd. is added to 100 parts by weight of the silicone resin “KE-106” to the mixed solution and stirred to obtain a silicone resin-containing coating material. Prepared. A translucent member of Example 12 was produced in the same manner as Example 3 except that the silicone resin-containing coating material was used.

(Example 13)
Silica particles “Sphericel 110P8” manufactured by Potters Ballotini Co., Ltd. were added to 60 parts by weight of a solution in which silicone resins “KE-106” and “KR-255” manufactured by Shin-Etsu Chemical Co., Ltd. were mixed at a weight ratio of 1: 1. 40 parts by weight) was added and stirred to prepare a mixed solution. Next, 10 parts by weight of a curing agent “CAT-RG” manufactured by Shin-Etsu Chemical Co., Ltd. is added to 100 parts by weight of the silicone resin “KE-106” to the mixed solution and stirred to obtain a silicone resin-containing coating material. Prepared. A translucent member of Example 13 was produced in the same manner as Example 3 except that the silicone resin-containing coating material was used.

(Comparative Example 1)
A translucent member of Comparative Example 1 was produced in the same manner as in Example 1 except that the MI value of the polycarbonate sheet was changed to 45.

(Comparative Example 2)
A translucent member of Comparative Example 2 was produced in the same manner as in Example 1 except that the MI value of the polycarbonate sheet was changed to 40.

(Comparative Example 3)
A translucent member of Comparative Example 3 was produced in the same manner as in Example 3 except that the MI value of the polycarbonate sheet was changed to 45.

  Regarding the translucent members of Examples 1 to 13 and Comparative Examples 1 to 3, the total light transmittance was measured as follows, and the presence or absence of moire fringes was evaluated.

<Measurement of total light transmittance>
Using a light transmittance measuring device “Hazeguard II” (trade name) manufactured by Toyo Seiki Seisakusho, measurement was performed according to JIS K7105 “Optical characteristic test of plastic”.

<Presence of moire stripes>
Both sides of the translucent member were visually observed, and the case where no moire fringes were confirmed was evaluated as good (A), and the case where moire fringes were confirmed was evaluated as poor (B).

  The results are shown in Table 1.

  From Table 1, it turns out that the translucent member of Examples 1-13 of this invention has a high total light transmittance, and there is no generation | occurrence | production of a moire fringe. On the other hand, it turns out that the moire fringe generate | occur | produced in the translucent member of Comparative Examples 1-3.

  INDUSTRIAL APPLICABILITY The present invention can provide a translucent member that is excellent in light transmissivity, does not generate moire fringes, and can also impart incombustibility. It can be suitably used as a lighting cover.

10, 20 Translucent member 11 Synthetic resin layer (synthetic resin sheet)
12 1st glass cloth 13 2nd glass cloth 14 Silicone resin layer 21 Semi-cylindrical part 22 Flange part

Claims (11)

Synthetic resin layer and before Symbol silicone resin layer on at least one surface of the laminate comprising a glass cloth bonded to both faces of the synthetic resin layer is a light-transmitting member being further joined,
The synthetic resin that forms the synthetic resin layer is a thermoplastic resin,
The thermoplastic resin is polycarbonate, polypropylene, polyethylene, polystyrene, polyethylene terephthalate, polyphenylene ether, polyamide, ABS resin or acrylic resin,
MI value of the synthetic resin is 50 or more,
A translucent member having a value of | n _P −n _G | of 0.07 or less, where n _{P is} the refractive index of the synthetic resin layer and n _G is the refractive index of the glass cloth. .   The translucent member according to claim 1, wherein the MI value is 60 or more and 65 or less. Wherein the glass cloth, the synthetic in order to increase the bonding strength between the resin layer, the translucent member according to claim 1 or 2 coupling treatment that have been subjected. The translucent member according to claim 1, wherein the thermoplastic resin is polycarbonate. The synthetic resin layer has a thickness of 150 μm to 250 μm,
Transparent member described in any one of claims 1 to 4 the basis weight of the glass cloth is ^{100g / m 2 ~300g / m 2} . The translucent member according to claim 1, wherein the silicone resin layer includes silica particles. A translucent member in which a silicone resin layer is further bonded to at least one surface of a laminate including a synthetic resin layer and glass cloth bonded to both surfaces of the synthetic resin layer,
The MI value of the synthetic resin forming the synthetic resin layer is 50 or more,
When the refractive index of the synthetic resin layer is n _P and the refractive index of the glass cloth is n _G , the value of | n _P −n _G | is 0.07 or less.
The silicone resin layer contains silica particles,
The silica particles are fumed silica, BET specific surface area of the fumed silica, 100 m ² / g or more 300 meters ² / g or less der Ru translucent member.   The translucent member according to claim 1, having a total light transmittance of 30% or more and 80% or less.   The translucent member according to any one of claims 1 to 8, which is molded into an arbitrary shape. It is a manufacturing method of the translucent member according to claim 6 or 7 ,
Applying a coating material containing a silicone resin and silica particles on one side of the first glass cloth, and forming a silicone resin coating layer on the surface of the first glass cloth;
Heating the silicone resin coating layer to form a silicone resin layer on the surface of the first glass cloth;
The glass cloth side of the first glass cloth on which the silicone resin layer is formed is disposed on one surface of a synthetic resin sheet made of a synthetic resin having an MI value of 50 or more, and the first surface is disposed on the other surface of the synthetic resin sheet. Arranging 2 glass cloths to form a laminate;
Bonding the first glass cloth, the synthetic resin sheet and the second glass cloth by thermocompression bonding the laminate.
A translucent member having a value of | n _P −n _G | of 0.07 or less, where n _{P is} the refractive index of the synthetic resin sheet and n _G is the refractive index of the glass cloth. Manufacturing method. The manufacturing method of the translucent member of Claim 10 which further includes the process of shape | molding the said laminated body which carried out thermocompression bonding.

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