JP5577910B2 - Housing, method for forming coating film, electronic device and method for manufacturing the same - Google Patents
Housing, method for forming coating film, electronic device and method for manufacturing the same Download PDFInfo
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Description
本発明は、筐体、塗膜の形成方法、電子機器及びその製造方法に関する。 The present invention relates to a housing, a coating film forming method, an electronic device, and a manufacturing method thereof.
近年、環境への配慮から、ノート型パーソナル・コンピュータ（ノートパソコン）、携帯電話等の電子機器にも環境負荷の低減が求められている。現在、電子機器の筐体材料は、ウレタン樹脂又はエポキシ樹脂等の石油を原料とする樹脂を主成分としており、環境負荷の低い材料の適用が求められている。 In recent years, in consideration of the environment, electronic devices such as notebook personal computers (notebook personal computers) and mobile phones have been required to reduce environmental loads. Currently, casing materials for electronic devices are mainly composed of a resin that uses petroleum as a raw material, such as urethane resin or epoxy resin, and application of a material with low environmental impact is required.
近時では、電子機器の筐体の塗装に、環境負荷の小さい材料を用いた塗料の適用が検討されている（例えば特許文献１〜５を参照）。
環境負荷の小さい材料としては、ポリ乳酸を含む材料を用いた塗料が好適である。しかしながらこの場合、基材へのアタックが強過ぎて塗料として不適であること（特許文献４の場合）、塗膜が白味を帯びて透明性を損なうこと（特許文献５の場合）等の問題がある。
Recently, application of a paint using a material with a small environmental load is being studied for coating a casing of an electronic device (see, for example, Patent Documents 1 to 5).
As a material having a small environmental load, a paint using a material containing polylactic acid is suitable. However, in this case, the attack on the base material is too strong and unsuitable as a paint (in the case of Patent Document 4), and the coating film becomes white and impairs transparency (in the case of Patent Document 5). There is.
ポリ乳酸を主成分とする塗料は、アクリル樹脂又はウレタン樹脂等の石油系樹脂と混合し、或いはイソシアネート系架橋剤と混合する等して用いるのが一般的である。しかしながらこの場合、基材に依って付着性が異なり、良好な硬度及び外観と良好な付着性とを満足する塗膜が得られ難いという問題がある。 In general, a coating material containing polylactic acid as a main component is mixed with a petroleum resin such as an acrylic resin or a urethane resin, or mixed with an isocyanate crosslinking agent. However, in this case, the adhesiveness varies depending on the base material, and there is a problem that it is difficult to obtain a coating film satisfying good hardness and appearance and good adhesiveness.
本発明は、上記の課題に鑑みてなされたものであり、基材の材料として、汎用される石油系樹脂を用い、基材との密着性に優れ、しかも透明度及び硬度が高い塗膜を実現し、環境負荷が小さく信頼性の高い筐体、塗膜の形成方法、電子機器及びその製造方法を提供することを目的とする。 The present invention has been made in view of the above problems, and uses a commonly used petroleum-based resin as a material for the base material, and realizes a coating film having excellent adhesion to the base material and high transparency and hardness. An object of the present invention is to provide a highly reliable housing, a method for forming a coating film, an electronic device, and a method for manufacturing the same, which have a low environmental load.
筐体の一態様は、石油を原料とする樹脂からなる基材と、前記基材上を塗料で塗装してなる塗膜とを備え、前記塗料はポリ乳酸を含み、前記塗膜は、当該塗膜の前記基材との界面におけるポリ乳酸の含有率が３０％以上４０％以下であり、当該塗膜の表面におけるポリ乳酸の含有率が５０％以上７０％以下である。 One aspect of the housing includes a base material made of a resin made of petroleum as a raw material, and a coating film formed by coating the base material with a paint, the paint contains polylactic acid, The content of polylactic acid at the interface of the coating film with the substrate is 30% or more and 40% or less, and the content of polylactic acid on the surface of the coating film is 50% or more and 70% or less .
塗膜の形成方法の一態様は、石油を原料とする樹脂からなる基材上に、ポリ乳酸を含む第１の塗料を塗装する工程と、前記基材上に塗装された前記第１の塗料を半乾燥させる工程と、半乾燥状態の前記第１の塗料上に、ポリ乳酸を含む第２の塗料を塗装する工程と、前記基材上に順次塗装された前記第１の塗料及び前記第２の塗料を一括して熱乾燥し、第１の塗膜及び第２の塗膜が積層されてなる塗膜を形成する工程とを含み、前記塗膜は、当該塗膜の前記基材との界面におけるポリ乳酸の含有率が３０％以上４０％以下であり、当該塗膜の表面におけるポリ乳酸の含有率が５０％以上７０％以下である。 One aspect of the method for forming a coating film includes a step of applying a first paint containing polylactic acid on a base material made of a resin made from petroleum , and the first paint applied on the base material A step of semi-drying, a step of applying a second paint containing polylactic acid on the first paint in a semi-dried state, the first paint and the first paint sequentially applied on the substrate And a step of thermally drying the two paints together to form a coating film formed by laminating the first coating film and the second coating film, wherein the coating film comprises the base material of the coating film and The content of polylactic acid at the interface is 30% or more and 40% or less, and the content of polylactic acid on the surface of the coating film is 50% or more and 70% or less .
本発明によれば、基材の材料として、汎用される石油系樹脂を用い、基材との密着性に優れ、しかも透明度及び硬度が高い塗膜が得られ、環境負荷が小さく信頼性の高い筐体、及び電子機器が実現する。 According to the present invention, a widely used petroleum-based resin is used as a base material, and a coating film having excellent adhesion to the base material and high transparency and hardness is obtained, and the environmental load is small and the reliability is high. A housing and an electronic device are realized.
本実施形態を詳述するにあたり、石油系樹脂からなる基材に、ポリ乳酸を含む塗料を塗装して塗膜を形成した場合の、塗料中のポリ乳酸の含有率と塗膜性能との関係について調べた。その結果を以下の表１に示す。 In detailing the present embodiment, the relationship between the content of polylactic acid in the coating material and the coating film performance when a coating film is formed by applying a coating material containing polylactic acid to a base material made of a petroleum resin. Investigated about. The results are shown in Table 1 below.
塗料中のポリ乳酸の含有率を上げると、塗膜が脆くなって鉛筆硬度が低下したり、白味を帯びて透明性が劣化して外観が悪くなる傾向がある。塗膜性能としては、ポリ乳酸の含有率が５０％〜７０％程度の場合が良好である。しかしながら、石油系基材に対する付着性を確保するためには、塗料中のポリ乳酸の含有率を下げる必要があり、環境負荷の低減効果がさほど期待できなくなる。 When the content of polylactic acid in the paint is increased, the coating film becomes brittle and the pencil hardness is lowered, or the whiteness is apt to deteriorate the transparency and deteriorate the appearance. The coating film performance is good when the polylactic acid content is about 50% to 70%. However, in order to ensure adhesion to petroleum-based substrates, it is necessary to reduce the content of polylactic acid in the paint, and the effect of reducing the environmental load cannot be expected so much.
以下、上記の検討結果を考慮して得られた具体的な実施形態について、図面を参照しながら詳細に説明する。
本実施形態を適用する筐体としてノートパソコンの筐体を例示し、ノートパソコンの構成を製造方法と共に説明する。本実施形態による筐体は、ノートパソコンのみならず、携帯電話等に代表される各種の電子機器の筐体に適用することができる。
Hereinafter, specific embodiments obtained in consideration of the above examination results will be described in detail with reference to the drawings.
A case of a notebook personal computer will be exemplified as a case to which the present embodiment is applied, and the configuration of the notebook personal computer will be described together with a manufacturing method. The housing according to the present embodiment can be applied not only to notebook personal computers but also to various electronic devices such as mobile phones.
図１は、本実施形態による筐体を有するノートパソコンの製造方法を工程順に示すフロー図である。
先ず、石油系樹脂を用いて筐体基材を作製する（ステップＳ１）。
詳細には、石油系樹脂、例えばアクリル樹脂又はウレタン樹脂等を含む材料を用いて射出成形を行う。即ち、所定の射出成形機により、石油系樹脂をノートパソコンの筐体基材の金型に注入して固化する。これにより、石油系樹脂からなるノートパソコンの筐体基材が作製される。
FIG. 1 is a flowchart showing a method of manufacturing a notebook computer having a housing according to the present embodiment in the order of steps.
First, a housing base material is prepared using a petroleum resin (step S1).
Specifically, injection molding is performed using a material containing a petroleum resin , for example, an acrylic resin or a urethane resin. That is, a predetermined injection molding machine is used to inject petroleum resin into a mold of a casing base material of a notebook personal computer and solidify it. Thereby, the housing | casing base material of the notebook personal computer which consists of petroleum resin is produced.
本実施形態では、筐体基材上に塗装する塗料として、ポリ乳酸をバインダー樹脂として含む塗料を用いる。
このポリ乳酸を含む塗料は、以下のように作製する。
例えば酢酸エチル等の溶剤に、例えば非晶質のポリ乳酸を溶解し、所定濃度のポリ乳酸溶液を作製する。
ポリ乳酸溶液と、ポリ乳酸との相溶性を有する塗料用の樹脂、例えばアクリル樹脂とを配合し、塗料を作製する。ポリ乳酸との相溶性を有する塗料用の樹脂として、アクリル樹脂の代わりに、ウレタン樹脂又はイソシアネート系樹脂等を用いても良い。ここで、ポリ乳酸のアクリル樹脂との配合率（固形分比）、即ちポリ乳酸の含有率（固形分比）が異なる２種の塗料を作製する。これらの樹脂を第１の塗料及び第２の塗料とする。第１の塗料及び第２の塗料は、後者が前者よりもポリ乳酸の含有率が高いものである。具体的には、第１の塗料は、ポリ乳酸の含有率が５０％未満、より好ましくは３０％以上４０％以下の所定値とされる。第２の塗料は、ポリ乳酸の含有率が５０％以上７０％以下の所定値とされる。
作製された第１の塗料及び第２の塗料は、適宜希釈して、スプレー塗装が可能な粘度に調整される。このとき、第１の塗料用のシンナーには、揮発性の高い、沸点が１００℃以下の溶剤を１０％未満の含有率となるように配合しておくことが望ましい。
In the present embodiment, a paint containing polylactic acid as a binder resin is used as a paint to be coated on the housing substrate.
The coating material containing this polylactic acid is produced as follows.
For example, for example, amorphous polylactic acid is dissolved in a solvent such as ethyl acetate to prepare a polylactic acid solution having a predetermined concentration.
A paint is prepared by blending a polylactic acid solution and a resin for paint having compatibility with polylactic acid, for example, an acrylic resin. As a resin for paint having compatibility with polylactic acid, urethane resin or isocyanate resin may be used instead of acrylic resin. Here, two types of coating materials having different blending ratios (solid content ratio) of polylactic acid with acrylic resin, that is, polylactic acid contents (solid content ratio), are prepared. These resins are referred to as a first paint and a second paint. In the first paint and the second paint, the latter has a higher polylactic acid content than the former. Specifically, the first coating material has a polylactic acid content of less than 50%, more preferably 30% to 40%. The second paint has a polylactic acid content of 50% to 70%.
The produced 1st coating material and 2nd coating material are diluted suitably, and are adjusted to the viscosity which can be spray-coated. At this time, it is desirable that the first paint thinner is blended with a highly volatile solvent having a boiling point of 100 ° C. or less so as to have a content of less than 10%.
続いて、第１の塗料を筐体基材上に塗装する（ステップＳ２）。
詳細には、上記のように作製された第１の塗料を用い、例えばスピンドル塗装機により筐体基材上にスプレー塗装する。
Subsequently, the first paint is applied on the casing substrate (step S2).
More specifically, the first coating material produced as described above is used, and spray coating is performed on the casing base material by, for example, a spindle coating machine.
続いて、第１の塗料を半乾燥させる（ステップＳ３）。
詳細には、スピンドル塗装機において、表面に第１の塗料が塗装された筐体基材を、スプレーを停止させた状態で所定時間、例えば５分間程度回転を継続させる。これにより、筐体基材上に塗装された第１の塗料が半乾燥する。ここで半乾燥とは、塗装された第１の塗料が、その上に重ねて塗装される第２の塗料と均一に混合することなく、少なくとも第１の塗料の筐体基材との界面部位と第２の塗料の表面部位とでポリ乳酸の含有率が異なる程度の乾燥状態であることを言う。第１の塗料は、揮発性の高い、沸点が１００℃以下の溶剤を１０％未満の含有率で含む。これにより、第１の塗料の半乾燥には熱処理が不要となり、上記のように筐体基材を所定時間回転させたり、セッティング時間を長目に設定したりすることのみで、第１の塗料の半乾燥が可能となる。
Subsequently, the first paint is semi-dried (step S3).
Specifically, in the spindle coating machine, the casing base material having the surface coated with the first paint is continuously rotated for a predetermined time, for example, about 5 minutes with the spraying stopped. Thereby, the 1st coating material painted on the housing base material is semi-dried. Here, the semi-drying means that at least an interface portion of the first coating material with the casing base material is not mixed uniformly with the second coating material to be applied over the first coating material. And the surface portion of the second paint are in a dry state with different polylactic acid contents. The first paint contains a highly volatile solvent having a boiling point of 100 ° C. or less at a content of less than 10%. As a result, no heat treatment is required for semi-drying the first coating material, and the first coating material can be obtained only by rotating the casing base material for a predetermined time or setting a longer setting time as described above. Can be semi-dried.
続いて、第２の塗料を第１の塗料上に塗装する（ステップＳ４）。
詳細には、上記のように作製された第２の塗料を用い、スピンドル塗装機により、筐体基材上に塗装された第１の塗料上にスプレー塗装する。
Subsequently, the second paint is applied on the first paint (step S4).
Specifically, the second coating material produced as described above is used, and spray coating is performed on the first coating material coated on the housing base material by a spindle coating machine.
続いて、第１の塗料及び第２の塗料を一括して熱乾燥する（ステップＳ５）。
詳細には、筐体基材上に積層された第１の塗料及び第２の塗料を、５０℃〜８０℃程度の温度、例えば７０℃で１５分間〜６０分間程度の時間、例えば４０分間、熱乾燥する。これにより、筐体基材上に、第１の塗料及び第２の塗料が熱乾燥してなる第１の塗膜及び第２の塗膜が形成される。以上により、ノートパソコンの筐体基材上に第１の塗膜及び第２の塗膜が積層形成されてなるノートパソコン筐体が作製される。
Subsequently, the first paint and the second paint are collectively heat-dried (step S5).
Specifically, the first paint and the second paint laminated on the housing substrate are heated at a temperature of about 50 ° C. to 80 ° C., for example, 70 ° C. for about 15 minutes to 60 minutes, for example, 40 minutes. Heat dry. Thereby, the 1st coating film and the 2nd coating film formed by heat-drying a 1st coating material and a 2nd coating material are formed on a housing base material. As described above, a notebook personal computer casing in which the first coating film and the second coating film are laminated on the casing base material of the notebook personal computer is manufactured.
作製されたノートパソコン筐体の概略断面を図２に示す。
ノートパソコン筐体は、筐体基材１上に第１の塗膜２及び第２の塗膜３が順次積層して一体化し、塗膜１０とされて構成される。塗膜１０は、上記のように第１の塗料及び第２の塗料が一括して熱乾燥され、第１の塗料が固化して第１の塗膜２が、第２の塗料が固化して第２の塗膜３が形成されたものである。第１の塗膜２は膜厚３μｍ〜２０μｍ程度、第２の塗膜３は膜厚５μｍ〜２０μｍ程度に形成される。塗膜１０では、第１の塗膜２と第２の塗膜３とが一体化される。そのため、その接続面（便宜上、破線で示す。）は不明瞭となり、接続面の近傍部位では、塗膜１０の筐体基材１との界面へ向かうほど徐々に第１の塗料中のポリ乳酸の含有率（固形分比）に近づいてゆく。一方、塗膜１０の表面へ向かうほど徐々に第２の塗料中のポリ乳酸の含有率（固形分比）に近づいてゆく。
FIG. 2 shows a schematic cross section of the produced notebook personal computer casing.
The notebook personal computer casing is configured by forming a first coating film 2 and a second coating film 3 on the casing base material 1 in order to form a coating film 10. As described above, the first paint and the second paint are collectively heat-dried as described above, the first paint is solidified, and the first paint 2 is solidified by the second paint. The second coating film 3 is formed. The first coating film 2 is formed to a film thickness of about 3 μm to 20 μm, and the second coating film 3 is formed to a film thickness of about 5 μm to 20 μm. In the coating film 10, the first coating film 2 and the second coating film 3 are integrated. Therefore, the connection surface (indicated by a broken line for the sake of convenience) becomes unclear, and in the vicinity of the connection surface, the polylactic acid in the first paint gradually increases toward the interface with the casing substrate 1 of the coating film 10. It approaches the content ratio (solid content ratio). On the other hand, as it goes to the surface of the coating film 10, it gradually approaches the polylactic acid content (solid content ratio) in the second paint.
塗膜１０では、その筐体基材１との界面におけるポリ乳酸の含有率と、その表面におけるポリ乳酸の含有率とが異なる。具体的には、前者の含有率が５０％未満、より好ましくは３０％以上４０％以下の所定値とされる。一方、後者の含有率が５０％以上７０％以下の所定値とされる。 In the coating film 10, and the content of the surfactant in the definitive polylactic acid and its housing base 1, and the content of the polylactic acid definitive on the surface it is different. Specifically, the former content is set to a predetermined value of less than 50%, more preferably 30% to 40%. On the other hand, the latter content is set to a predetermined value of 50% to 70%.
本実施形態では、筐体基材１は石油系樹脂から形成され、塗膜１０はポリ乳酸を含有する材料から形成される。塗膜１０について、第１の塗膜２における筐体基材１との界面では、ポリ乳酸の含有率を比較的低く、具体的には５０％未満に抑える。ここで、当該界面における含有率が３０％未満では、塗膜材料（塗料）に環境負荷の小さいポリ乳酸を有意に用いているとは言い難い。当該界面における含有率が５０％以上では、塗膜１０の筐体基材１との密着性が低下する。密着性をより確実に得るには、当該界面における含有率を４０％以下とすれば良い。従って、当該界面における含有率を３０％以上４０％以下の所定値とすることで、環境負荷が小さく、筐体基材１との密着性の高い塗膜１０が得られる。 In this embodiment, the housing substrate 1 is formed from a petroleum-based resin , and the coating film 10 is formed from a material containing polylactic acid. About the coating film 10, in the interface with the housing base material 1 in the 1st coating film 2, the content rate of polylactic acid is restrained comparatively low, specifically, less than 50%. Here, the content of which definitive in the interface is less than 30%, it is hard to say that the coating material (paint) is significantly with small polylactic environmental impact. Content of definitive to the interface at 50% or more, adhesion between the casing base 1 of the coating film 10 is reduced. To obtain adhesion more reliably, a content of definitive to the interface may be 40% or less. Therefore, by setting the content of definitive to the interface with the predetermined value of 40% or more and 30% or less, low environmental impact, coating film 10 with high adhesion to the casing base 1 is obtained.
一方、塗膜１０について、第２の塗膜３における表面では、ポリ乳酸の含有率を比較的高くする。当該表面における含有率が５０％未満では、塗膜材料（塗料）に環境負荷の小さいポリ乳酸を有意に用いているとは言い難い。当該表面における含有率が７０％を越えると、塗膜１０の透明性及び硬度が損なわれる可能性がある。従って、当該含有率を５０％以上７０％以下とすることで、環境負荷が小さく、透明性及び硬度の高い塗膜１０が得られる。
以上のように、本実施形態では、石油系材料からなる筐体基材１を用いる場合に、環境負荷の小さい植物性樹脂であるポリ乳酸を塗膜１０に用い、筐体基材１との密着性が高く、しかも透明度及び硬度が高い塗膜１０を備えたノートパソコン筐体が実現する。
On the other hand, with respect to the coating film 10, the polylactic acid content is relatively high on the surface of the second coating film 3. When the content of definitive on the surface is less than 50%, it is hard to say that the coating material (paint) is significantly with small polylactic environmental impact. When the content of the definitive on the surface exceeds 70%, there is a possibility that the transparency and the hardness of the coating film 10 is impaired. Therefore, by setting the content to 50% or more and 70% or less, it is possible to obtain the coating film 10 with low environmental load and high transparency and hardness.
As described above, in the present embodiment, when the casing base material 1 made of a petroleum-based material is used, polylactic acid, which is a vegetable resin having a low environmental load, is used for the coating film 10, A notebook personal computer casing having a coating film 10 with high adhesion and high transparency and hardness is realized.
ステップＳ５の後、作製されたノートパソコン筐体に、所定のパソコン機能を備えたノートパソコン本体を適宜装着して組み込み、ノートパソコンを作製する（ステップＳ６）。
図３に、上記のように作製されたノートパソコンの一例を示す。ノートパソコン２０は、ノートパソコン本体１２の表面の少なくとも一部がノートパソコン筐体１１により覆われている。ノートパソコン筐体１１は、ノートパソコン本体１２のＬＣＤ１２ａのフロントカバー１１ａ、ＬＣＤ１２ａのバックカバー１１ｂ、アッパーカバー１１ｃ、ロアカバー１１ｄからなる。
フロントカバー１１ａを図４に、バックカバー１１ｂを図５に、アッパーカバー１１ｃを図６に、ロアカバー１１ｄを図７に、それぞれ示す。
After step S5, the notebook personal computer main body having a predetermined personal computer function is appropriately mounted and incorporated in the manufactured notebook personal computer casing to produce a notebook personal computer (step S6).
FIG. 3 shows an example of a notebook personal computer manufactured as described above. In the notebook computer 20, at least a part of the surface of the notebook computer body 12 is covered with the
4 shows the
以上説明したように、本実施形態によれば、石油系樹脂からなる筐体基材１を用いる場合に、環境負荷の小さい植物性樹脂であるポリ乳酸を塗膜１０に用いるも、筐体基材１との密着性に優れ、しかも透明度及び硬度が高い塗膜１０が得られ、環境負荷が小さく信頼性の高いノートパソコン筐体、及びノートパソコンが実現する。 As described above, according to the present embodiment, when the casing substrate 1 made of petroleum resin is used, polylactic acid, which is a vegetable resin having a low environmental load, is used for the coating film 10. A coating film 10 having excellent adhesion to the material 1 and having high transparency and hardness is obtained, and a notebook computer housing and notebook computer with low environmental impact and high reliability are realized.
以下、本発明の好適な諸実施例について説明する。本実施例では、上記した実施形態に基づいて作製されたノートパソコン筐体について、その密着性、鉛筆硬度、及び外観について、塗膜のポリ乳酸の含有率を変えて実際に調べた結果について説明する。 Hereinafter, preferred embodiments of the present invention will be described. In this example, for the notebook PC case manufactured based on the above-described embodiment, the adhesion, pencil hardness, and appearance were actually examined by changing the polylactic acid content of the coating film. To do.
（実施例１）
筐体基材の材料として、ポリカーボネート／アクリロニトリル・ブタジエン・スチレン（ＰＣ／ＡＢＳ）を使用し、これを射出成形して平板を作製した。この平板を筐体基材のサンプルとして用いた。
塗料の材料として、非晶質ポリ乳酸である東洋紡株式会社の商品名バイロエコールＢＥ−４５０を使用し、これを酢酸エチルに溶解させて５０％溶液を作製した。以下の表２に示すような配合比（固形分比）で、塗料用アクリル樹脂と配合した塗料（１），（２），（３），（４），（５）を作製した。
Example 1
Polycarbonate / acrylonitrile butadiene styrene (PC / ABS) was used as a material for the housing substrate, and this was injection molded to produce a flat plate. This flat plate was used as a sample for the housing substrate.
As a material for the paint, Toyobo Co., Ltd., trade name Viro Ecole BE-450, which is amorphous polylactic acid, was used and dissolved in ethyl acetate to prepare a 50% solution. Paints (1), (2), (3), (4), and (5) blended with the acrylic resin for paints were prepared at a blending ratio (solid content ratio) as shown in Table 2 below.
サンプル（４），（５）を、ミカサペイント製の商品名ハイコートシンナーで希釈し、スプレー塗装が可能な粘度に調整した。第１の塗料として用いる塗料（１）〜（３）には、ハイコートシンナーに、揮発性の高い沸点が１００℃以下の溶剤、例えばシクロヘキサンを含有率が１０％未満となるように追加して、粘度を調整した。
スピンドル塗装機を用いて、塗料（１）〜（３）を第１の塗料として平板上に塗装した。
スピンドル塗装機のスプレーを停止させた状態で、平板の回転を５分間継続した。これにより、各平板上に塗装された第１の塗料を半乾燥した。
Samples (4) and (5) were diluted with Mikasa Paint's brand name High Coat Thinner to adjust the viscosity to enable spray coating. In the coating materials (1) to (3) used as the first coating material, a solvent having a high boiling point of 100 ° C. or less, for example, cyclohexane is added to the high coat thinner so that the content is less than 10%. The viscosity was adjusted.
The coating materials (1) to (3) were applied as a first coating material on a flat plate using a spindle coating machine.
The plate rotation was continued for 5 minutes with the spray on the spindle coater stopped. Thereby, the 1st coating material painted on each flat plate was semi-dried.
引き続き、スピンドル塗装機を用いて、塗料（２）〜（５）を第２の塗料として第１の塗料に重ねて塗装した。
第１の塗料及び第２の塗料を一括して、温度７０℃で４０分間、熱乾燥した。これにより、各平板上に第１の塗膜及び第２の塗膜が積層されてなる試料Ａ〜試料Ｆを作製した。試料Ａでは、第１の塗膜が塗料（１）、第２の塗膜が塗料（２）から形成される。試料Ｂでは、第１の塗膜が塗料（１）、第２の塗膜が塗料（４）から形成される。試料Ｃでは、第１の塗膜が塗料（１）、第２の塗膜が塗料（５）から形成される。試料Ｄでは、第１の塗膜が塗料（２）、第２の塗膜が塗料（３）から形成される。試料Ｅでは、第１の塗膜が塗料（２）、第２の塗膜が塗料（５）から形成される。試料Ｆでは、第１の塗膜が塗料（３）、第２の塗膜が塗料（４）から形成される。試料Ｇでは、第１の塗膜が塗料（３）、第２の塗膜が塗料（５）から形成される。
Subsequently, the paints (2) to (5) were applied as a second paint on the first paint using a spindle coater.
The first paint and the second paint were collectively dried at a temperature of 70 ° C. for 40 minutes. Thereby, Sample A to Sample F in which the first coating film and the second coating film were laminated on each flat plate were produced. In sample A, the first coating film is formed from the paint (1) and the second coating film is formed from the paint (2). In Sample B, the first coating film is formed from the paint (1), and the second coating film is formed from the paint (4). In sample C, the first coating film is formed from the paint (1) and the second coating film is formed from the paint (5). In sample D, the first coating film is formed from the paint (2), and the second coating film is formed from the paint (3). In sample E, the first coating film is formed from the paint (2) and the second coating film is formed from the paint (5). In sample F, the first coating film is formed from the paint (3), and the second coating film is formed from the paint (4). In sample G, the first coating film is formed from the paint (3), and the second coating film is formed from the paint (5).
上記の試料Ａ〜試料Ｇについて、塗膜の平板との密着性、塗膜の鉛筆硬度、塗膜の外観、を評価した。密着性は、クロスカット試験（１ｍｍ□の碁盤目をカッターで作製し、テープを貼り付けた後、テープを剥離し、碁盤目の皮膜の剥離状態を評価する試験）により行い、全ての碁盤目で剥離の無い状態をＯＫとした。鉛筆硬度は、塗膜の表面を５回引っ掻いて、５回全てにおいて剥離しない状態をＯＫとした。試料Ａ〜Ｇの評価結果を以下の表３に示す。総合評価では、ＯＫが良好、△が限定的ではあるが良、ＮＧが不可である。 About said sample A-sample G, the adhesiveness with the flat plate of a coating film, the pencil hardness of a coating film, and the external appearance of a coating film were evaluated. Adhesion is determined by cross-cut test (test to make 1 mm square grid with a cutter, peel off the tape, and then evaluate the peeled state of the grid pattern). The state without peeling was determined as OK. The pencil hardness was determined as OK when the surface of the coating film was scratched 5 times and not peeled off at all 5 times. The evaluation results of Samples A to G are shown in Table 3 below. In the comprehensive evaluation, OK is good, Δ is limited but good, and NG is not possible.
第１の塗膜に塗料（１）（ポリ乳酸の含有率が４０％）、第２の塗膜に塗料（２）（ポリ乳酸の含有率が５０％）を使用した試料Ａでは、密着性、硬度、外観の全てについて良好な結果が得られた。第１の塗膜に塗料（１）、第２の塗膜に塗料（４）（ポリ乳酸の含有率が７０％）を使用した試料Ｂでは、やや透明性に劣り、使用範囲が濃色に限定されるレベルであった。第１の塗膜に塗料（１）、第２の塗膜に塗料（５）（ポリ乳酸の含有率が８０％）を使用した試料Ｃでは、外観が白味を帯びておりＮＧであった。第１の塗膜に塗料（２）、第２の塗膜に塗料（３）（ポリ乳酸の含有率が６０％）を使用した試料Ｄでは、クロスカット試験で８０／１００となり、マージンはないものの使用可能なレベルであった。第１の塗膜に塗料（２）、第２の塗膜に塗料（５）を使用した試料Ｅでは、外観が白味を帯びておりＮＧであった。第１の塗膜に塗料（３）を使用した試料Ｆ，Ｇでは、クロスカット試験で６０／１００となり、パソコン及び携帯電話向けとしてはＮＧであった。
以上より、実施例１の実験では、第１の塗膜はポリ乳酸の含有率が４０％程度以下であり、第２の塗膜はポリ乳酸の含有率が５０％確保されていれば、好適であることが判った。
In sample A using paint (1) (polylactic acid content of 40%) for the first coating and paint (2) (polylactic acid content of 50%) for the second coating, Good results were obtained with respect to hardness, hardness and appearance. Sample B, which uses paint (1) for the first coating film and paint (4) for the second coating film (polylactic acid content of 70%), is slightly inferior in transparency and has a darker usage range. It was a limited level. In sample C using paint (1) for the first coating film and paint (5) (polylactic acid content of 80%) for the second coating film, the appearance was white and NG. . Sample D, which uses paint (2) for the first coating film and paint (3) for the second coating film (polylactic acid content of 60%), is 80/100 in the cross-cut test and has no margin. It was a usable level of things. In sample E using paint (2) for the first coating film and paint (5) for the second coating film, the appearance was white and NG. Samples F and G using paint (3) for the first coating film were 60/100 in the cross-cut test, and were NG for personal computers and mobile phones.
From the above, in the experiment of Example 1, it is preferable that the first coating film has a polylactic acid content of about 40% or less and the second coating film has a polylactic acid content of 50%. It turned out that.
（実施例２）
本実施例では、ノートパソコン筐体のバックカバーを作製した。
詳細には、実施例１と同様の塗料（１），（４）にカーボンブラックを加えて、黒の塗料を作製した。実施例１と同様に、ＰＣ／ＡＢＳを射出成形して筐体基材を作製し、上記の塗料（１），（４）を順次塗装して、実施例１の試料Ｂと同様の塗膜を形成した。このように作製した、塗面の比較的広いバックカバーでは、塗膜が全面に亘り均一に塗装形成され、密着性、外観、鉛筆硬度の全てについて満足する塗膜が得られた。
(Example 2)
In this example, a back cover of a notebook personal computer casing was produced.
Specifically, carbon black was added to the same paints (1) and (4) as in Example 1 to prepare a black paint. Similarly to Example 1, PC / ABS is injection-molded to prepare a casing base material, and the paints (1) and (4) are sequentially applied, and the coating film is the same as Sample B of Example 1. Formed. With the back cover having a relatively wide coating surface, the coating film was uniformly formed over the entire surface, and a coating film satisfying all of adhesion, appearance, and pencil hardness was obtained.
以下、諸態様を付記としてまとめて記載する。 Hereinafter, various aspects will be collectively described as additional notes.
（付記１）石油系材料からなる基材と、
前記基材上を塗料で塗装してなる塗膜と
を備え、
前記塗料はポリ乳酸を含み、
前記塗膜は、当該塗膜の表面部位の方が当該塗膜の前記基材との界面部位よりもポリ乳酸の含有率が高いことを特徴とする筐体。
(Appendix 1) a base material made of petroleum material;
A coating film formed by coating the base material with a paint,
The paint comprises polylactic acid;
The said coating film is a housing | casing characterized by the content rate of polylactic acid being higher in the surface site | part of the said coating film than the interface site | part with the said base material of the said coating film.
（付記２）前記塗膜は、当該塗膜の前記基材との界面部位におけるポリ乳酸の含有率が５０％未満であり、当該塗膜の表面部位におけるポリ乳酸の含有率が５０％以上７０％以下であることを特徴とする付記１に記載の筐体。 (Additional remark 2) The content rate of the polylactic acid in the interface site | part with the said base material of the said coating film is less than 50%, and the content rate of the polylactic acid in the surface site | part of the said coating film is 50% or more 70 The casing according to appendix 1, wherein the casing is not more than%.
（付記３）前記塗膜は、当該塗膜の前記基材との界面部位におけるポリ乳酸の含有率が３０％以上４０％以下であり、当該塗膜の表面部位におけるポリ乳酸の含有率が５０％以上７０％以下であることを特徴とする付記１に記載の筐体。 (Supplementary Note 3) The coating film has a polylactic acid content of 30% or more and 40% or less at the interface portion of the coating film with the substrate, and a polylactic acid content of 50 at a surface portion of the coating film. The casing according to appendix 1, wherein the casing is equal to or greater than 70% and equal to or less than 70%.
（付記４）石油系材料からなる基材上に、ポリ乳酸を含む第１の塗料を塗装する工程と、
前記基材上に塗装された前記第１の塗料を半乾燥させる工程と、
半乾燥状態の前記第１の塗料上に、ポリ乳酸を含む第２の塗料を塗装する工程と、
前記基材上に順次塗装された前記第１の塗料及び前記第２の塗料を一括して熱乾燥し、第１の塗膜及び第２の塗膜が積層されてなる塗膜を形成する工程と
を含み、
前記塗膜は、当該塗膜の表面部位の方が当該塗膜の前記基材との界面部位よりもポリ乳酸の含有率が高いことを特徴とする塗膜の形成方法。
(Appendix 4) A step of applying a first paint containing polylactic acid on a base material made of a petroleum material;
Semi-drying the first paint painted on the substrate;
Applying a second paint containing polylactic acid on the first paint in a semi-dry state;
The process of forming the coating film formed by laminating the first coating film and the second coating film by collectively drying the first coating material and the second coating material sequentially coated on the base material. Including and
The said coating film is a formation method of the coating film characterized by the content rate of polylactic acid being higher in the surface site | part of the said coating film than the interface site | part with the said base material of the said coating film.
（付記５）前記第１の塗膜は、前記基材との界面部位におけるポリ乳酸の含有率が５０％未満であり、前記第２の塗膜は、表面部位におけるポリ乳酸の含有率が５０％以上７０％以下であることを特徴とする付記４に記載の塗膜の形成方法。 (Supplementary Note 5) The first coating film has a polylactic acid content of less than 50% at the interface portion with the substrate, and the second coating film has a polylactic acid content of 50 at the surface portion. % Or more and 70% or less, The method for forming a coating film according to appendix 4.
（付記６）前記第１の塗膜は、前記基材との界面部位におけるポリ乳酸の含有率が３０％以上４０％以下であり、前記第２の塗膜は、表面部位におけるポリ乳酸の含有率が５０％以上７０％以下であることを特徴とする付記４に記載の塗膜の形成方法。 (Additional remark 6) As for the said 1st coating film, the content rate of the polylactic acid in the interface site | part with the said base material is 30% or more and 40% or less, and the said 2nd coating film contains polylactic acid in the surface site | part. The method for forming a coating film according to appendix 4, wherein the rate is 50% or more and 70% or less.
（付記７）前記第１の塗料は、沸点が１００℃以下の溶剤を１０％未満の含有率で含むことを特徴とする付記４〜６のいずれか１項に記載の塗膜の形成方法。 (Additional remark 7) The said 1st coating material contains the solvent whose boiling point is 100 degrees C or less with the content rate of less than 10%, The formation method of the coating film of any one of Additional remark 4-6 characterized by the above-mentioned.
（付記８）筐体と、
前記筐体が装着される電子機器本体と
を備えた電子機器であって、
前記筐体は、
石油系材料からなる基材と、
前記基材上を塗料で塗装してなる塗膜と
を備え、
前記塗料はポリ乳酸を含み、
前記塗膜は、当該塗膜の表面部位の方が当該塗膜の前記基材との界面部位よりもポリ乳酸の含有率が高いことを特徴とする電子機器。
(Appendix 8) a housing;
An electronic device comprising: an electronic device main body to which the housing is mounted,
The housing is
A base material made of petroleum-based material;
A coating film formed by coating the base material with a paint,
The paint comprises polylactic acid;
The electronic device, wherein the coating film has a higher polylactic acid content in a surface portion of the coating film than in an interface portion of the coating film with the base material.
（付記９）前記塗膜は、当該塗膜の前記基材との界面部位におけるポリ乳酸の含有率が５０％未満であり、当該塗膜の表面部位におけるポリ乳酸の含有率が５０％以上７０％以下であることを特徴とする付記８に記載の電子機器。 (Appendix 9) The coating film has a polylactic acid content of less than 50% at the interface portion of the coating film with the substrate, and a polylactic acid content of the surface portion of the coating film of 50% or more and 70. The electronic apparatus according to appendix 8, wherein the electronic apparatus is equal to or less than%.
（付記１０）前記塗膜は、当該塗膜の前記基材との界面部位におけるポリ乳酸の含有率が３０％以上４０％以下であり、当該塗膜の表面部位におけるポリ乳酸の含有率が５０％以上７０％以下であることを特徴とする付記８に記載の電子機器。 (Additional remark 10) The content rate of the polylactic acid in the interface site | part with the said base material of the said coating film is 30% or more and 40% or less, and the content rate of the polylactic acid in the surface site | part of the said coating film is 50. The electronic device according to appendix 8, wherein the electronic device is not less than 70% and not more than 70%.
（付記１１）筐体を作製する工程と、
電子機器本体を前記筐体に組み込む工程と
を備え、
前記筐体を作製する工程は、
石油系材料からなる基材上に、ポリ乳酸を含む第１の塗料を塗装する工程と、
前記基材上に塗装された前記第１の塗料を半乾燥させる工程と、
半乾燥状態の前記第１の塗料上に、ポリ乳酸を含む第２の塗料を塗装する工程と、
前記基材上に順次塗装された前記第１の塗料及び前記第２の塗料を一括して熱乾燥し、第１の塗膜及び第２の塗膜が積層されてなる塗膜を形成する工程と
を含み、
前記塗膜は、当該塗膜の表面部位の方が当該塗膜の前記基材との界面部位よりもポリ乳酸の含有率が高いことを特徴とする電子機器の製造方法。
(Additional remark 11) The process of producing a housing | casing,
A step of incorporating an electronic device main body into the housing,
The step of producing the casing includes
Applying a first paint containing polylactic acid on a base material made of petroleum-based material;
Semi-drying the first paint painted on the substrate;
Applying a second paint containing polylactic acid on the first paint in a semi-dry state;
The process of forming the coating film formed by laminating the first coating film and the second coating film by collectively drying the first coating material and the second coating material sequentially coated on the base material. Including and
The method for manufacturing an electronic device, wherein the coating film has a higher polylactic acid content in a surface part of the coating film than in an interface part of the coating film with the base material.
（付記１２）前記第１の塗膜は、前記基材との界面部位におけるポリ乳酸の含有率が５０％未満であり、前記第２の塗膜は、表面部位におけるポリ乳酸の含有率が５０％以上７０％以下であることを特徴とする付記１１に記載の電子機器の製造方法。
(Supplementary Note 12) The first coating film has a polylactic acid content of less than 50% at the interface portion with the substrate, and the second coating film has a polylactic acid content of 50 at the surface portion. The method for manufacturing an electronic device according to
（付記１３）前記第１の塗膜は、前記基材との界面部位におけるポリ乳酸の含有率が３０％以上４０％以下であり、前記第２の塗膜は、表面部位におけるポリ乳酸の含有率が５０％以上７０％以下であることを特徴とする付記１１に記載の電子機器の製造方法。
(Supplementary Note 13) The first coating film has a polylactic acid content of 30% or more and 40% or less at the interface portion with the substrate, and the second coating film contains polylactic acid in the surface portion. The manufacturing method of the electronic device according to
（付記１４）前記第１の塗料は、沸点が１００℃以下の溶剤を１０％未満の含有率で含むことを特徴とする付記１１〜１３のいずれか１項に記載の電子機器の製造方法。 (Additional remark 14) The said 1st coating material contains the solvent whose boiling point is 100 degrees C or less with the content rate of less than 10%, The manufacturing method of the electronic device of any one of Additional remarks 11-13 characterized by the above-mentioned.
１ 筐体基材
２ 第１の塗膜
３ 第２の塗膜
１０ 塗膜
１１ ノートパソコン筐体
１１ａ フロントカバー
１１ｂ バックカバー
１１ｃ アッパーカバー
１１ｄ ロアカバー
１２ ノートパソコン本体
１２ａ ＬＣＤ
２０ ノートパソコン
DESCRIPTION OF SYMBOLS 1 Case base material 2 1st coating film 3 2nd coating film 10
20 laptop
Claims (4)
前記基材上を塗料で塗装してなる塗膜と
を備え、
前記塗料はポリ乳酸を含み、
前記塗膜は、当該塗膜の前記基材との界面におけるポリ乳酸の含有率が３０％以上４０％以下であり、当該塗膜の表面におけるポリ乳酸の含有率が５０％以上７０％以下であることを特徴とする筐体。 A base material made of a resin made from petroleum,
A coating film formed by coating the base material with a paint,
The paint comprises polylactic acid;
The coating film has a polylactic acid content of 30% or more and 40% or less at the interface of the coating film with the substrate, and a polylactic acid content of 50% or more and 70% or less on the surface of the coating film. housing, characterized in that.
前記基材上に塗装された前記第１の塗料を半乾燥させる工程と、
半乾燥状態の前記第１の塗料上に、ポリ乳酸を含む第２の塗料を塗装する工程と、
前記基材上に順次塗装された前記第１の塗料及び前記第２の塗料を一括して熱乾燥し、第１の塗膜及び第２の塗膜が積層されてなる塗膜を形成する工程と
を含み、
前記塗膜は、当該塗膜の前記基材との界面におけるポリ乳酸の含有率が３０％以上４０％以下であり、当該塗膜の表面におけるポリ乳酸の含有率が５０％以上７０％以下であることを特徴とする塗膜の形成方法。 Applying a first paint containing polylactic acid on a base material made of a resin made from petroleum; and
Semi-drying the first paint painted on the substrate;
Applying a second paint containing polylactic acid on the first paint in a semi-dry state;
The process of forming the coating film formed by laminating the first coating film and the second coating film by collectively drying the first coating material and the second coating material sequentially coated on the base material. Including and
The coating film has a polylactic acid content of 30% or more and 40% or less at the interface of the coating film with the substrate, and a polylactic acid content of 50% or more and 70% or less on the surface of the coating film. A method for forming a coating film, characterized by comprising:
前記筐体が装着される電子機器本体と
を備えた電子機器であって、
前記筐体は、
石油を原料とする樹脂からなる基材と、
前記基材上を塗料で塗装してなる塗膜と
を備え、
前記塗料はポリ乳酸を含み、
前記塗膜は、当該塗膜の前記基材との界面におけるポリ乳酸の含有率が３０％以上４０％以下であり、当該塗膜の表面におけるポリ乳酸の含有率が５０％以上７０％以下であることを特徴とする電子機器。 A housing,
An electronic device comprising: an electronic device main body to which the housing is mounted,
The housing is
A base material made of a resin made from petroleum,
A coating film formed by coating the base material with a paint,
The paint comprises polylactic acid;
The coating film has a polylactic acid content of 30% or more and 40% or less at the interface of the coating film with the substrate, and a polylactic acid content of 50% or more and 70% or less on the surface of the coating film. electronic apparatus, characterized in that.
電子機器本体を前記筐体に組み込む工程と
を備え、
前記筐体を作製する工程は、
石油を原料とする樹脂からなる基材上に、ポリ乳酸を含む第１の塗料を塗装する工程と、
前記基材上に塗装された前記第１の塗料を半乾燥させる工程と、
半乾燥状態の前記第１の塗料上に、ポリ乳酸を含む第２の塗料を塗装する工程と、
前記基材上に順次塗装された前記第１の塗料及び前記第２の塗料を一括して熱乾燥し、第１の塗膜及び第２の塗膜が積層されてなる塗膜を形成する工程と
を含み、
前記塗膜は、当該塗膜の前記基材との界面におけるポリ乳酸の含有率が３０％以上４０％以下であり、当該塗膜の表面におけるポリ乳酸の含有率が５０％以上７０％以下であることを特徴とする電子機器の製造方法。 Producing a housing;
A step of incorporating an electronic device main body into the housing,
The step of producing the casing includes
Applying a first paint containing polylactic acid on a base material made of a resin made from petroleum; and
Semi-drying the first paint painted on the substrate;
Applying a second paint containing polylactic acid on the first paint in a semi-dry state;
The process of forming the coating film formed by laminating the first coating film and the second coating film by collectively drying the first coating material and the second coating material sequentially coated on the base material. Including and
The coating film has a polylactic acid content of 30% or more and 40% or less at the interface of the coating film with the substrate, and a polylactic acid content of 50% or more and 70% or less on the surface of the coating film. A method for manufacturing an electronic device, comprising:
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| JP2003128888A (en) * | 2001-10-24 | 2003-05-08 | Mitsui Chemicals Inc | Laminate |
| JP3099577U (en) * | 2003-07-30 | 2004-04-08 | 中央化学株式会社 | Food containers |
| JP5209380B2 (en) * | 2007-06-06 | 2013-06-12 | 三菱樹脂株式会社 | Laminated body, stretched film, heat-shrinkable film, molded article using the laminated body, and container equipped with the film |
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