JP2004079522A - Lighting cover and its manufacturing method - Google Patents
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Description
本発明は、照明カバーおよびその製造方法に関する。 The present invention relates to a lighting cover and a method for manufacturing the same.
メタクリル系樹脂等の透明樹脂は、様々な用途に使用されており、種々の性能が要求されている。それらの中でも、照明カバー用途においては、室内の照明効率及び防眩性向上を目的として、乳白色半透明の光拡散性メタクリル系樹脂が使用されている。この光拡散性メタクリル系樹脂からなる照明カバーには、全光線透過率が高く点灯時に明るいこと、照明カバーを通して点灯した光源が透けて見えにくいことが要求されている。そのため、例えば硫酸バリウム、炭酸カルシウム、シリカのような無機系微粒子や、架橋樹脂からなる有機系微粒子が光拡散剤として含有されている（例えば、特許文献１、特許文献２等）。 透明 Transparent resins such as methacrylic resins are used for various applications, and various performances are required. Among them, in the use of a lighting cover, a milky white translucent light-diffusing methacrylic resin is used for the purpose of improving indoor lighting efficiency and antiglare property. The illumination cover made of this light-diffusing methacrylic resin is required to have a high total light transmittance and to be bright at the time of lighting, and to be hard to see through the light source lit through the illumination cover. Therefore, for example, inorganic fine particles such as barium sulfate, calcium carbonate, and silica, and organic fine particles made of a crosslinked resin are contained as a light diffusing agent (for example, Patent Documents 1 and 2).
しかし、かかる光拡散剤を含有する光拡散性メタクリル系樹脂よりなる照明カバーにおいて、光源からの光を十分に拡散するためには、光拡散剤の含有量を多くする必要がある。光拡散剤の含有量が多くなると、光拡散性メタクリル系樹脂からなる照明カバーをリサイクル（とりわけケミカルリサイクル）する場合、メタクリル系樹脂以外の残存物割合が高くなるために、リサイクル性に劣るという問題があった。 However, in a lighting cover made of a light diffusing methacrylic resin containing such a light diffusing agent, it is necessary to increase the content of the light diffusing agent in order to sufficiently diffuse light from a light source. When the content of the light diffusing agent is increased, when the light cover made of the light diffusing methacrylic resin is recycled (especially chemical recycling), the ratio of the residue other than the methacrylic resin is increased, so that the recyclability is poor. was there.
一方、リサイクル性を向上させるためには、光拡散剤の含有量を少なくすればよいが、それでは光源からの光を十分に拡散することができず、照明カバーを通して点灯した光源が透けて見えやすくなり防眩性が低下する。光拡散剤の含有量を少なくしながら光源からの光を十分に拡散するためには、光拡散性メタクリル系樹脂からなる照明カバーの厚みを大きくしなければならず、照明カバー全体が重たくなってしまうという問題があった。 On the other hand, in order to improve the recyclability, the content of the light diffusing agent may be reduced, but the light from the light source cannot be sufficiently diffused, and the light source lit through the lighting cover is easily seen through. And the antiglare property is reduced. In order to sufficiently diffuse the light from the light source while reducing the content of the light diffusing agent, the thickness of the light cover made of the light-diffusing methacrylic resin must be increased, and the entire light cover becomes heavy. There was a problem that it would.
また特許文献３には、粒子径３〜５０μｍの粒子が分散された熱可塑性樹脂非発泡層と熱可塑性樹脂発泡層とからなる多層体が記載されているが、多層体を製造するためには共押出しする等、製造コストが増大するという問題があった。 Patent Literature 3 describes a multilayer body including a thermoplastic resin non-foamed layer and a thermoplastic resin foamed layer in which particles having a particle size of 3 to 50 μm are dispersed. There is a problem that the production cost increases, such as co-extrusion.
本発明の目的は、上記問題点を解決するものであり、全光線透過率が高く、光源の透けを抑制し、かつ低コストでリサイクル性に優れる照明カバーおよびその製造方法を提供することにある。 An object of the present invention is to solve the above problems, and to provide a lighting cover having high total light transmittance, suppressing transmission of a light source, being low in cost and having excellent recyclability, and a method of manufacturing the same. .
本発明者らは、鋭意検討した結果、光拡散性メタクリル系樹脂に含有される光拡散剤に代わり、メタクリル系樹脂発泡体の気泡を光拡散因子とすることにより、照明カバーとしての要求を満たし、かつ単位体積当りのメタクリル系樹脂使用量が少なくて済むこと、更にリサイクル後のメタクリル系樹脂以外の残存物割合を低くすることができることを見出した。 The present inventors have conducted intensive studies and found that, instead of the light diffusing agent contained in the light diffusible methacrylic resin, the cells of the methacrylic resin foam are used as the light diffusing factor, thereby satisfying the requirements as a lighting cover. In addition, the present inventors have found that the amount of methacrylic resin used per unit volume can be reduced, and that the ratio of residues other than methacrylic resin after recycling can be reduced.
また、メタクリル系樹脂にアクリル系ゴム粒子を含有させることにより、発泡体の強度を向上させることができ、更にメタクリル系樹脂に帯電防止剤を含有させることにより、照明カバーに求められる特性である埃の付着防止性を付与できることを見出した。 In addition, by including acrylic rubber particles in the methacrylic resin, the strength of the foam can be improved. In addition, by including an antistatic agent in the methacrylic resin, dust, which is a characteristic required for a lighting cover, can be improved. Has been found to be capable of imparting anti-adhesion properties.
すなわち、本発明の要旨は、メタクリル系樹脂発泡体であって、該発泡体の気泡を光拡散因子とする照明カバーにある。メタクリル系樹脂発泡体の気泡径は１０〜２０００μｍであることが好ましい。メタクリル系樹脂発泡体の気泡径アスペクト比は３以下であることが好ましい。メタクリル系樹脂発泡体の発泡倍率は１．１倍を超え３倍以下であることが好ましい。 That is, the gist of the present invention resides in a lighting cover that is a methacrylic resin foam and uses bubbles of the foam as a light diffusion factor. The methacrylic resin foam preferably has a cell diameter of 10 to 2000 μm. The methacrylic resin foam preferably has a cell diameter aspect ratio of 3 or less. The expansion ratio of the methacrylic resin foam is preferably more than 1.1 times and 3 times or less.
また、本発明の要旨は、メタクリル系樹脂１００質量部に対し熱分解型発泡剤０．０５〜１質量部を添加した配合物を加熱成形する、メタクリル系樹脂発泡体であって該発泡体の気泡を光拡散因子とする照明カバーの製造方法にある。 Further, the gist of the present invention is a methacrylic resin foam obtained by heating and molding a composition obtained by adding 0.05 to 1 part by mass of a pyrolytic foaming agent to 100 parts by mass of a methacrylic resin. The present invention relates to a method for manufacturing a lighting cover using bubbles as a light diffusion factor.
本発明によれば、メタクリル系樹脂発泡体の気泡を光拡散因子とすることにより、全光線透過率が高く、光源の透けを抑制し、かつ低コストでリサイクル性に優れた照明カバーを得ることができる。また、アクリル系ゴム粒子、帯電防止剤の添加により衝撃強さと帯電防止性能を向上させた照明カバーを得ることができる。 According to the present invention, by using air bubbles of a methacrylic resin foam as a light diffusion factor, it is possible to obtain a lighting cover which has high total light transmittance, suppresses light transmission through a light source, and has low cost and excellent recyclability. Can be. In addition, a lighting cover having improved impact strength and antistatic performance can be obtained by adding acrylic rubber particles and an antistatic agent.
すなわち、この照明カバーは発泡体であるため、単位体積当りのメタクリル系樹脂使用量が少なくて済み、またその他の添加剤類も少なくて済む。従って環境に配慮した照明カバーであるといえる。また、その後のリサイクルにおいても、添加物が少ないために乾留残渣が少なく、リサイクルの効率が良いという利点がある。 That is, since this lighting cover is a foam, the amount of methacrylic resin used per unit volume can be reduced, and other additives can be reduced. Therefore, it can be said that the lighting cover is environmentally friendly. Also, in the subsequent recycling, there is an advantage that the amount of the residue is small because the amount of the additive is small, and the recycling efficiency is high.
本発明におけるメタクリル系樹脂とは、メタクリル酸メチル単独重合体あるいは、メタクリル酸メチルを５０質量％以上、好ましくは７０質量％以上と、メタクリル酸メチルと共重合可能な他の単量体との共重合体である。 The methacrylic resin in the present invention refers to a copolymer of methyl methacrylate homopolymer or methyl methacrylate of 50% by mass or more, preferably 70% by mass or more, and another monomer copolymerizable with methyl methacrylate. It is a polymer.
メタクリル系樹脂には、強度を上げるために、アクリル系ゴム粒子を添加しても良い。アクリル系ゴム粒子の添加量は、メタクリル系樹脂１００質量部当たり１〜５０質量部が好ましい。ゴム添加量が少なすぎると、強度の向上効果が得られず、多すぎると剛性が低下し成形品が変形しやすくなるため、上記範囲が好ましい。 ア ク リ ル Acrylic rubber particles may be added to the methacrylic resin in order to increase the strength. The addition amount of the acrylic rubber particles is preferably 1 to 50 parts by mass per 100 parts by mass of the methacrylic resin. If the amount of added rubber is too small, the effect of improving the strength cannot be obtained, and if it is too large, the rigidity is reduced and the molded product is easily deformed. Therefore, the above range is preferable.
アクリル系ゴム粒子とは、アルキル基の炭素数が１〜８であるアクリル酸アルキルエステル３０質量％以上、好ましくは５０質量％以上と、アクリル酸アルキルエステルと共重合可能な他の単量体との共重合体であり、室温においてエラストマー的性質を示すものである。ゴム粒子の外層には、メタクリル系硬質樹脂からなる層を有することが好ましい。 Acrylic rubber particles are an alkyl acrylate having an alkyl group having 1 to 8 carbon atoms of 30% by mass or more, preferably 50% by mass or more, and another monomer copolymerizable with the alkyl acrylate. And exhibit elastomeric properties at room temperature. The outer layer of the rubber particles preferably has a layer made of a methacrylic hard resin.
またメタクリル系樹脂発泡体に帯電防止性能を付与するため、メタクリル系樹脂に帯電防止剤を添加しても良い。帯電防止剤の添加量は、メタクリル系樹脂１００質量部に対して、炭素数が８〜２２であるアルキル基を有するアルキルスルホン酸あるいはアルキルベンゼンスルホン酸のアルカリ金属塩０．１〜１０質量部が好ましい。帯電防止剤の添加量が少なすぎると帯電防止性能が不十分となり、多すぎるとリサイクル時の残存物割合が多くなるため上記範囲が好ましい。 In addition, an antistatic agent may be added to the methacrylic resin in order to impart antistatic performance to the methacrylic resin foam. The addition amount of the antistatic agent is preferably from 0.1 to 10 parts by mass of an alkyl sulfonic acid having an alkyl group having 8 to 22 carbon atoms or an alkali metal salt of alkyl benzene sulfonic acid with respect to 100 parts by mass of the methacrylic resin. . If the addition amount of the antistatic agent is too small, the antistatic performance becomes insufficient, and if the addition amount is too large, the ratio of the residue during recycling increases, so the above range is preferable.
メタクリル系樹脂発泡体の気泡は連続気泡または独立気泡が挙げられるが、光の拡散性および強度の点で独立気泡であることが好ましい。 (4) The cells of the methacrylic resin foam may be open cells or closed cells, but are preferably closed cells in terms of light diffusivity and intensity.
かかるメタクリル系樹脂発泡体の気泡径は１０〜２０００μｍの範囲が好ましい。気泡径が小さすぎると、全光線透過率が低下し、大きすぎると強度が低下することがあり、上記範囲が好ましい。 気 泡 The cell diameter of the methacrylic resin foam is preferably in the range of 10 to 2000 µm. If the bubble diameter is too small, the total light transmittance may decrease, and if it is too large, the strength may decrease, and the above range is preferable.
気泡径アスペクト比は、気泡の長径を短径で除して算出するが、３以下であることが好ましい。気泡径アスペクト比が大きすぎると、全光線透過率が低下し、照明器具としての明るさが不足する傾向にある。気泡径アスペクト比は１に近いほど、すなわち気泡が真球に近いほど好ましい。気泡径アスペクト比をこの範囲内にする方法としては、例えば押出成形によるシート製造時の、樹脂の吐出量に対するロール回転速度、すなわち引き落としを小さくする方法が挙げられる。 The bubble diameter aspect ratio is calculated by dividing the long diameter of the bubble by the short diameter, and is preferably 3 or less. If the bubble diameter aspect ratio is too large, the total light transmittance tends to decrease, and the brightness as a lighting fixture tends to be insufficient. It is preferable that the bubble diameter aspect ratio is closer to 1, that is, the bubble is closer to a true sphere. As a method for keeping the bubble diameter aspect ratio within this range, for example, a method of reducing the roll rotation speed with respect to the resin discharge amount, that is, the pull-down during sheet production by extrusion molding, may be mentioned.
また、発泡倍率は１．１倍を超え３倍以下であることが好ましい。発泡倍率が低すぎると、光拡散性が不十分になりやすく、照明カバーを通して点灯した光源が透けて見えやすくなり防眩性が低下する。発泡倍率が高すぎると全光線透過率及び強度が低下する傾向にある。発泡倍率をこの範囲内にする方法としては、例えば発泡剤の添加量を調節する方法、発泡助剤を添加する方法等が挙げられる。 発 泡 Further, the expansion ratio is preferably more than 1.1 times and 3 times or less. If the expansion ratio is too low, the light diffusivity tends to be insufficient, and the light source lit through the illumination cover is easily seen through and the antiglare property is reduced. If the expansion ratio is too high, the total light transmittance and strength tend to decrease. Examples of a method for setting the expansion ratio within this range include a method of adjusting the amount of a foaming agent to be added and a method of adding a foaming aid.
メタクリル系樹脂発泡体を得る手段としては、本発明の目的を満足できれば特に限定されないが、例えば発泡剤として熱分解型発泡剤を用いて、メタクリル系樹脂の粉末やペレットとドライブレンドし、熱分解型発泡剤の熱分解温度以上の温度条件下で押出成形や射出成形する手段が挙げられる。 Means for obtaining a methacrylic resin foam is not particularly limited as long as the object of the present invention can be satisfied.For example, using a pyrolytic foaming agent as a blowing agent, dry blending with methacrylic resin powder or pellets, Means for extrusion molding or injection molding under a temperature condition not lower than the thermal decomposition temperature of the mold foaming agent may be mentioned.
熱分解型発泡剤としては、例えば、重炭酸ナトリウム、炭酸ナトリウム、重炭酸アンモニウム、炭酸アンモニウムなどの無機発泡剤、アゾジカルボンアミドなどのアゾ化合物の他、ニトロソ化合物、スルホニルヒドラジド化合物、アジド化合物などが挙げられる。 Examples of the pyrolytic foaming agent include inorganic foaming agents such as sodium bicarbonate, sodium carbonate, ammonium bicarbonate and ammonium carbonate, azo compounds such as azodicarbonamide, nitroso compounds, sulfonyl hydrazide compounds, and azide compounds. No.
発泡剤の種類は発泡倍率、気泡径などにより選択され、１種単独で用いてもよいし、２種以上を併用してもかまわない。 (4) The type of the foaming agent is selected depending on the expansion ratio, the cell diameter, and the like, and one type may be used alone or two or more types may be used in combination.
発泡剤の添加量はメタクリル系樹脂１００質量部当り０．０５〜１質量部が好ましく、０．１〜０．５質量部がより好ましい。発泡剤の添加量が少なすぎると、得られたメタクリル系樹脂発泡体の単位体積当りの気泡数が少なくなる。そのために、光拡散性が不十分になり、照明カバーに用いた場合、点灯した光源が透けて見えやすくなり防眩性が低下する。逆に多すぎると、得られたメタクリル系樹脂発泡体の単位体積当りの気泡数が多くなりすぎ、全光線透過率及び強度が低下する傾向にある。 (4) The addition amount of the foaming agent is preferably 0.05 to 1 part by mass, more preferably 0.1 to 0.5 part by mass, per 100 parts by mass of the methacrylic resin. If the amount of the foaming agent is too small, the number of cells per unit volume of the obtained methacrylic resin foam decreases. For this reason, the light diffusing property becomes insufficient, and when used for a lighting cover, the lighted light source is easily seen through and the antiglare property is reduced. Conversely, if the amount is too large, the number of cells per unit volume of the obtained methacrylic resin foam becomes too large, and the total light transmittance and strength tend to decrease.
他方、メタクリル系樹脂発泡体を得る手段として、例えば、押出成形や射出成形等の成形工程において、加熱溶融したメタクリル系樹脂にガスを注入することも可能である。 On the other hand, as a means for obtaining a methacrylic resin foam, for example, in a molding step such as extrusion molding or injection molding, it is also possible to inject a gas into the methacrylic resin melted by heating.
ここで用いるガスとしては、例えば、二酸化炭素、窒素、アルゴン、水素、酸素、ブタン、プロパン等が挙げられ、必要に応じて１種単独で用いてもよいし、２種以上を併用することができ、例えば、空気を用いてもよい。 The gas used here includes, for example, carbon dioxide, nitrogen, argon, hydrogen, oxygen, butane, propane and the like. If necessary, one kind may be used alone, or two or more kinds may be used in combination. Yes, for example, air may be used.
また、必要に応じて発泡助剤を用いてもよい。発泡助剤は発泡剤の分解促進や気泡の均一化などの働きを持つものであり、クエン酸、サルチル酸、フタル酸、ステアリン酸などの有機酸などが挙げられる。発泡助剤の使用量はメタクリル系樹脂１００質量部当り０．０５〜１質量部程度が好ましい。 発 泡 Also, a foaming aid may be used as necessary. The foaming aid has a function of accelerating the decomposition of the foaming agent and making the bubbles uniform, and examples thereof include organic acids such as citric acid, salicylic acid, phthalic acid, and stearic acid. The amount of the foaming aid is preferably about 0.05 to 1 part by mass per 100 parts by mass of the methacrylic resin.
押出成形で得られた板状物は真空成形や圧空成形、プレス成形、ブロー成形することによって形状を変えることができ、様々な照明器具の透光カバー、即ち、照明カバーとして適用可能である。 (4) The shape of the plate obtained by extrusion molding can be changed by vacuum forming, air pressure forming, press forming, or blow molding, and it can be applied as a light-transmitting cover of various lighting fixtures, that is, a lighting cover.
メタクリル系樹脂発泡体の厚みは０．５〜３ｍｍ程度が好ましいが、照明カバーのサイズや必要な強度等によって本発明の目的を阻害しない範囲で選択される。 (4) The thickness of the methacrylic resin foam is preferably about 0.5 to 3 mm, but is selected within a range that does not impair the object of the present invention depending on the size of the lighting cover and the required strength.
他の添加物として、顔料、染料、酸化防止剤、紫外線吸収剤、光安定剤、光拡散剤、抗菌剤、熱安定剤等を含有してもよい。 顔料 As other additives, pigments, dyes, antioxidants, ultraviolet absorbers, light stabilizers, light diffusing agents, antibacterial agents, heat stabilizers and the like may be contained.
本発明においては、必ずしも光拡散剤は必要でないが、光拡散剤を添加してもかまわない。用いうる光拡散剤としては、例えば、炭酸カルシウム、硫酸バリウム、シリカ等の無機系微粒子が好ましい。その添加量はメタクリル系樹脂１００質量部当り０．０５〜１質量部で十分であり、従来の光拡散性メタクリル系樹脂に含有される光拡散剤の量よりも少なくてよい。 に お い て In the present invention, a light diffusing agent is not always necessary, but a light diffusing agent may be added. As the light diffusing agent that can be used, for example, inorganic fine particles such as calcium carbonate, barium sulfate, and silica are preferable. The addition amount of 0.05 to 1 part by mass per 100 parts by mass of the methacrylic resin is sufficient, and may be smaller than the amount of the light diffusing agent contained in the conventional light diffusing methacrylic resin.
以下、実施例によって本発明を更に詳しく説明するが、本発明はこれら実施例によって何等制限されるものではない。なお、実施例で得られたメタクリル系樹脂発泡体の評価は、以下の方法で行った。 Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. The methacrylic resin foam obtained in the examples was evaluated by the following method.
１）気泡径及び気泡径アスペクト比
得られたサンプルの断面顕微鏡観察から、気泡径及び気泡径アスペクト比を測定した。鋸切断することによってメタクリル系樹脂発泡体における断面を得て、１０〜１００倍で観察した。気泡径アスペクト比は気泡断面の楕円形の長径を短径で除して算出した。
1) Cell diameter and cell diameter aspect ratio The cell diameter and cell diameter aspect ratio were measured from a cross-sectional microscope observation of the obtained sample. A cross section of the methacrylic resin foam was obtained by sawing, and observed at a magnification of 10 to 100. The bubble diameter aspect ratio was calculated by dividing the longer diameter of the elliptical cross section of the bubble by the shorter diameter.
２）発泡倍率
得られたサンプルの密度をＪＩＳ Ｚ８８０７に準拠して測定し、メタクリル樹脂の密度１．１９をその密度で除して発泡倍率を算出した。
即ち、（メタクリル樹脂の密度１．１９）÷（得られたサンプルの密度）で算出した。
2) Expansion ratio The density of the obtained sample was measured in accordance with JIS Z8807, and the expansion ratio was calculated by dividing the density 1.19 of the methacrylic resin by the density.
That is, it was calculated by (the density of the methacrylic resin 1.19) ÷ (the density of the obtained sample).
３）全光線透過率
ＪＩＳ Ｋ７１０５のＢ法に準拠して測定した。
3) Total light transmittance The total light transmittance was measured according to the method B of JIS K7105.
４）光源の透け
サンプルを光源上１５ｍｍの位置に設置して、サンプル表面から垂直方向に光源を肉眼により観察し、光源の透けの有無を評価した。光源として松下電工（株）製のφ８ｍｍの蛍光管薄型多目的ライトＳＤ９４５０（商品名）（１０Ｗ×１灯）を使用した。
4) Transparency of the light source The sample was placed at a position of 15 mm above the light source, and the light source was observed with the naked eye in a vertical direction from the sample surface to evaluate whether the light source was transparent. As a light source, a fluorescent tube thin multipurpose light SD9450 (trade name) (10 W × 1 light) manufactured by Matsushita Electric Works, Ltd. was used.
５）リサイクル性
得られたメタクリル系樹脂発泡体を粉砕したものを５００℃で乾留し、投入量に対する残渣量の比率を測定した。
5) Recyclability The obtained methacrylic resin foam was pulverized and carbonized at 500 ° C., and the ratio of the amount of the residue to the amount charged was measured.
６）衝撃強さ
デュポン衝撃試験機を用いて５０％破壊高さを求めた。おもり質量は１００ｇ、撃芯および受け台径は１２．７ｍｍのものを使用した。
6) Impact strength A 50% breaking height was determined using a DuPont impact tester. The weight used was 100 g, and the diameter of the shooting core and the cradle were 12.7 mm.
７）電荷半減期
帯電防止性能の指標として、スタチックオネストメータ（商品名：シシド静電気（株）製）を用いて電荷半減期を測定した。印加電圧は１０ｋVとした。
7) Charge half-life As a measure of antistatic performance, the charge half-life was measured using a static honest meter (trade name: manufactured by Shisido Electrostatic Co., Ltd.). The applied voltage was 10 kV.
実施例１
メタクリル系樹脂〔アクリペットＶＨ（商品名）、三菱レイヨン（株）製、ペレット状〕１００質量部および熱分解型発泡剤〔セルボンＴＳＣ−４４（商品名）、永和化成工業（株）製〕０．３質量部をタンブラーにて混合し、２２０℃でＴダイより溶融押出して、厚さ２ｍｍのメタクリル系樹脂発泡体を得た。このサンプルは照明カバー用として適した全光線透過率を有し、かつ光源の透けに関しても良好であった。気泡の形状は全体にわたり押出方向に６００μｍ、幅方向に４００μｍ程度の楕円形状であり、発泡倍率は１．３倍であった。このサンプルを乾留した結果、残渣が非常に少なく、リサイクル性に優れていた。評価結果を表１に示す。
Example 1
100 parts by mass of a methacrylic resin [Acrypet VH (trade name), manufactured by Mitsubishi Rayon Co., Ltd., pellets] and a pyrolysis type foaming agent [Celbon TSC-44 (trade name), Eiwa Chemical Industry Co., Ltd.] 0 0.3 parts by mass were mixed by a tumbler and melt-extruded from a T-die at 220 ° C. to obtain a methacrylic resin foam having a thickness of 2 mm. This sample had a total light transmittance suitable for a lighting cover, and also had a good light transmission. The shape of the bubbles was an elliptical shape of about 600 μm in the extrusion direction and about 400 μm in the width direction throughout, and the expansion ratio was 1.3 times. As a result of carbonization of this sample, the residue was very small and the recyclability was excellent. Table 1 shows the evaluation results.
実施例２
熱分解型発泡剤を〔ビニホールＤＷ＃６（商品名）、永和化成工業（株）製〕に替えた以外は実施例１と同様にしてメタクリル系樹脂発泡体を得た。このサンプルは照明カバー用として適した全光線透過率を有し、かつ光源の透けに関しても良好であった。気泡の形状は全体にわたり押出方向に７００μｍ、幅方向に５００μｍ程度の楕円形状であり、発泡倍率は１．４倍であった。このサンプルを乾留した結果、残渣が非常に少なく、リサイクル性に優れていた。評価結果を表１に示す。
Example 2
A methacrylic resin foam was obtained in the same manner as in Example 1 except that the thermal decomposition type foaming agent was changed to [Vinihole DW # 6 (trade name), manufactured by Eiwa Chemical Industry Co., Ltd.]. This sample had a total light transmittance suitable for a lighting cover, and also had a good light transmission. The shape of the bubbles was an elliptical shape of about 700 μm in the extrusion direction and about 500 μm in the width direction throughout, and the expansion ratio was 1.4 times. As a result of carbonization of this sample, the residue was very small and the recyclability was excellent. Table 1 shows the evaluation results.
実施例３
実施例２において、無機系光拡散剤として炭酸カルシウム〔シプロンＡ（商品名）、白石カルシウム（株）製〕１．０質量部を添加してメタクリル系樹脂発泡体を得た。このサンプルは照明カバー用として適した全光線透過率を有し、かつ光源の透けに関しても良好であった。気泡の形状は全体にわたり押出方向に２００μｍ、幅方向に１００μｍ程度の楕円形状であり、発泡倍率は１．６倍であった。このサンプルを乾留した結果、残渣が少なく、リサイクル性に優れていた。評価結果を表１に示す。
Example 3
In Example 2, 1.0 part by mass of calcium carbonate (Sipron A (trade name), manufactured by Shiraishi Calcium Co., Ltd.) was added as an inorganic light diffusing agent to obtain a methacrylic resin foam. This sample had a total light transmittance suitable for a lighting cover, and also had a good light transmission. The shape of the bubbles was an elliptical shape of about 200 μm in the extrusion direction and about 100 μm in the width direction throughout, and the expansion ratio was 1.6 times. As a result of dry distillation of this sample, the residue was small and the recyclability was excellent. Table 1 shows the evaluation results.
実施例４
メタクリル系樹脂〔アクリペットＶＨ（商品名）、三菱レイヨン（株）製〕１００質量部、アクリル系ゴム粒子〔ＩＲ４４１（商品名）、三菱レイヨン（株）製〕１９質量部、帯電防止剤としてアルキル基の炭素数１２〜１４個のアルキルスルホン酸ナトリウム〔ケミスタット３０３３（商品名）、三洋化成工業（株）製〕１質量部、熱分解型発泡剤〔セルボンＴＳＣ−４４（商品名）、永和化成工業（株）製〕０．３質量部をタンブラーにて混合し、２２０℃にてＴダイより溶融押出して、厚さ１．８ｍｍのメタクリル系樹脂発泡体を得た。このサンプルは照明カバーとして適した全光線透過率を有し、かつ光源の透けに関しても良好であり、衝撃強さと帯電防止性能が向上した。気泡の形状は全体にわたり押出方向に５００μｍ、幅方向に３００μｍ程度の楕円形状であり、発泡倍率は１．３倍であった。このサンプルを乾留した結果、残渣が少なく、リサイクル性に優れていた。評価結果を表１に示す。
Example 4
100 parts by mass of methacrylic resin [Acrypet VH (trade name), manufactured by Mitsubishi Rayon Co., Ltd.], 19 parts by mass of acrylic rubber particles [IR441 (trade name), manufactured by Mitsubishi Rayon Co., Ltd.], alkyl as an antistatic agent Sodium alkylsulfonate having 12 to 14 carbon atoms [Chemistat 3033 (trade name), manufactured by Sanyo Chemical Industry Co., Ltd.] 1 part by mass, pyrolytic foaming agent [Celvon TSC-44 (trade name), Eiwa Kasei (Manufactured by Kogyo Co., Ltd.) 0.3 part by mass was mixed with a tumbler and melt-extruded from a T-die at 220 ° C. to obtain a 1.8 mm thick methacrylic resin foam. This sample had a total light transmittance suitable for a lighting cover, was excellent in light source transparency, and had improved impact strength and antistatic performance. The bubble shape was an elliptical shape of about 500 μm in the extrusion direction and about 300 μm in the width direction throughout, and the expansion ratio was 1.3 times. As a result of dry distillation of this sample, the residue was small and the recyclability was excellent. Table 1 shows the evaluation results.
実施例５
実施例４において、溶融押出する際のロール速度、シート引き取り速度を１．３倍にし、厚さ１．８ｍｍとなるように樹脂吐出量を増やしてメタクリル系樹脂発泡体を得た。気泡の形状は全体にわたり押出方向に１０００μｍ、幅方向に２５０μｍ程度の楕円形状であり、気泡径アスペクト比は４、発泡倍率は１．４倍であった。このサンプルは照明カバーとして光源の透けに関しては良好であったが、全光線透過率はやや低くなった。評価結果を表１に示す。
Example 5
In Example 4, a methacrylic resin foam was obtained by increasing the roll speed and the sheet take-up speed at the time of melt extrusion to 1.3 times and increasing the resin discharge amount so as to have a thickness of 1.8 mm. The shape of the bubbles was an elliptic shape of about 1000 μm in the extrusion direction and about 250 μm in the width direction throughout, the bubble diameter aspect ratio was 4, and the expansion ratio was 1.4 times. Although this sample was good as a lighting cover with respect to light source transmission, the total light transmittance was slightly lower. Table 1 shows the evaluation results.
比較例１
メタクリル系樹脂〔アクリペットＶＨ（商品名）、三菱レイヨン（株）製、ペレット状〕１００質量部に無機系光拡散剤として硫酸バリウム４質量部を加え、タンブラーにて混合した後、２２０℃でＴダイより溶融押出して、厚さ２ｍｍの光拡散性メタクリル系樹脂成形体を得た。このサンプルは照明カバー用として適した全光線透過率を有し、かつ光源の透けに関しても良好であった。しかしながら、乾留した結果、残渣が多く、リサイクル性に劣った。評価結果を表１に示す。
Comparative Example 1
100 parts by mass of a methacrylic resin [Acrypet VH (trade name), manufactured by Mitsubishi Rayon Co., Ltd., pellets] was added with 4 parts by mass of barium sulfate as an inorganic light diffusing agent, and mixed with a tumbler. It was melt-extruded from a T-die to obtain a light-diffusible methacrylic resin molded article having a thickness of 2 mm. This sample had a total light transmittance suitable for a lighting cover, and also had a good light transmission. However, as a result of carbonization, there were many residues and the recyclability was poor. Table 1 shows the evaluation results.
比較例２
メタクリル系樹脂〔アクリペットＶＨ（商品名）、三菱レイヨン（株）製〕１００質量部、アクリル系ゴム粒子〔ＩＲ４４１（商品名）、三菱レイヨン（株）製〕１９質量部、帯電防止剤としてアルキルスルホン酸ナトリウム〔ケミスタット３０３３（商品名）、三洋化成工業（株）製〕１質量部、無機系光拡散剤として硫酸バリウム４質量部を混合した樹脂組成物を２２０℃にてＴダイより溶融押出して、厚さ１．８ｍｍのメタクリル系樹脂成形体を得た。このサンプルは照明カバーとして適した全光線透過率を有し、かつ光源の透けに関しても良好であった。しかしながら、乾留した結果、残渣が多く、リサイクル性に劣った。評価結果を表１に示す。
Comparative Example 2
100 parts by mass of methacrylic resin [Acrypet VH (trade name), manufactured by Mitsubishi Rayon Co., Ltd.], 19 parts by mass of acrylic rubber particles [IR441 (trade name), manufactured by Mitsubishi Rayon Co., Ltd.], alkyl as an antistatic agent A resin composition obtained by mixing 1 part by mass of sodium sulfonate (Chemistat 3033 (trade name), manufactured by Sanyo Chemical Industries, Ltd.) and 4 parts by mass of barium sulfate as an inorganic light diffusing agent is melt-extruded from a T-die at 220 ° C. Thus, a methacrylic resin molded article having a thickness of 1.8 mm was obtained. This sample had a total light transmittance suitable for a lighting cover, and also had a good light transmission. However, as a result of carbonization, there were many residues and the recyclability was poor. Table 1 shows the evaluation results.
本発明により得られるメタクリル系樹脂発泡体から成る照明カバーは、様々な照明器具、例えば、天井付け型、吊り下げ型、壁付け型、行燈型、スタンド型、天井埋込型、サイン照明、ディスプレイ照明、看板等に好適に用いることができる。 Lighting cover made of methacrylic resin foam obtained by the present invention, various lighting fixtures, for example, ceiling type, hanging type, wall type, lighting type, stand type, ceiling embedded type, sign lighting, It can be suitably used for display lighting, signboards, and the like.
Claims (7)
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007011317A (en) * | 2005-05-31 | 2007-01-18 | Dainippon Ink & Chem Inc | Light diffusion film |
| JP2010508544A (en) * | 2006-10-30 | 2010-03-18 | ジーエル コリア カンパニー リミテッド | Cover plate for lighting device |
| JP2011075888A (en) * | 2009-09-30 | 2011-04-14 | Sekisui Plastics Co Ltd | Light diffusion sheet, method for manufacturing light diffusion sheet and light emitting device |
| JP2011209658A (en) * | 2010-03-30 | 2011-10-20 | Fujifilm Corp | Light-diffusing film for led lamp |
| US9910194B2 (en) | 2010-04-15 | 2018-03-06 | 3M Innovative Properties Company | Retroreflective articles including optically active areas and optically inactive areas |
| US10649274B2 (en) | 2009-04-15 | 2020-05-12 | 3M Innovative Properties Company | Optical construction and display system incorporating same |
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2003
- 2003-07-28 JP JP2003281099A patent/JP2004079522A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007011317A (en) * | 2005-05-31 | 2007-01-18 | Dainippon Ink & Chem Inc | Light diffusion film |
| JP2010508544A (en) * | 2006-10-30 | 2010-03-18 | ジーエル コリア カンパニー リミテッド | Cover plate for lighting device |
| US10649274B2 (en) | 2009-04-15 | 2020-05-12 | 3M Innovative Properties Company | Optical construction and display system incorporating same |
| US11435616B2 (en) | 2009-04-15 | 2022-09-06 | 3M Innovative Properties Company | Optical construction and display system incorporating same |
| JP2011075888A (en) * | 2009-09-30 | 2011-04-14 | Sekisui Plastics Co Ltd | Light diffusion sheet, method for manufacturing light diffusion sheet and light emitting device |
| JP2011209658A (en) * | 2010-03-30 | 2011-10-20 | Fujifilm Corp | Light-diffusing film for led lamp |
| US9910194B2 (en) | 2010-04-15 | 2018-03-06 | 3M Innovative Properties Company | Retroreflective articles including optically active areas and optically inactive areas |
| US10379271B2 (en) | 2010-04-15 | 2019-08-13 | 3M Innovative Properties Company | Retroreflective articles including optically active areas and optically inactive areas |
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