JP2005233839A - Method of testing discoloration of resin - Google Patents
Method of testing discoloration of resin Download PDFInfo
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- JP2005233839A JP2005233839A JP2004044941A JP2004044941A JP2005233839A JP 2005233839 A JP2005233839 A JP 2005233839A JP 2004044941 A JP2004044941 A JP 2004044941A JP 2004044941 A JP2004044941 A JP 2004044941A JP 2005233839 A JP2005233839 A JP 2005233839A
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Abstract
Description
本発明は、樹脂の変色試験方法、特にウレタンフォームの変色度合いを少ない測定誤差・バラツキで精度良く且つ簡便に測定する方法に関するものである。 The present invention relates to a resin discoloration test method, and more particularly to a method for accurately and easily measuring the degree of discoloration of urethane foam with little measurement error and variation.
従来、ウレタン等の樹脂は、一般に、酸化防止剤等の各種添加剤を添加して用いられているが、これら添加剤に起因して、或いは、樹脂本来の特性により、大気中の窒素酸化物や太陽光に含まれる紫外線等によって、黄変することが知られている。かかる樹脂の黄変を防止するために、窒素酸化物との反応を抑制する添加剤を添加したり、樹脂自体の構造を窒素酸化物や紫外線による影響を受けにくくする等の研究がなされている。ここで、樹脂を窒素酸化物や紫外線による影響を受けにくくする研究においては、かかる樹脂の合成・調製と共に、得られた樹脂サンプルの分析の果たす役割も大きく、如何に精度良く且つ簡便に分析するかが重要である。 Conventionally, resins such as urethane are generally used with various additives such as antioxidants added. However, due to these additives or due to the inherent properties of the resin, nitrogen oxides in the atmosphere are used. It is known that yellowing occurs due to ultraviolet rays contained in sunlight. In order to prevent such yellowing of the resin, studies have been made such as adding an additive that suppresses the reaction with nitrogen oxides, and making the structure of the resin itself less susceptible to the effects of nitrogen oxides and ultraviolet rays. . Here, in the research to make the resin less susceptible to nitrogen oxides and ultraviolet rays, the analysis and analysis of the obtained resin sample as well as the synthesis and preparation of such a resin play a large role, and how accurately and simply analyzes it. Is important.
ところで、樹脂の黄変の原因の一つである窒素酸化物による樹脂の変色され易さを測定する方法として、ＪＩＳ Ｌ ０８５５：１９９８（非特許文献１, 窒素酸化物に対する染色堅ろう度試験方法）が知られており、一般に該方法に従って、各種樹脂の窒素酸化物に対する耐変色性を評価している。しかしながら、該方法では、測定の度に亜硫酸ナトリウムと硫酸とから窒素酸化物を合成してサンプルの暴露に使用しなければならず、また、最終的には、グレースケール（ＪＩＳ Ｌ ０８５５：１９９８；非特許文献２, ＪＩＳ Ｌ ０８０４：１９９４）にて窒素酸化物に対する暴露後の変色状態を確認するので、測定する者の感覚に左右される部分があるため、測定のバラツキ・誤差が大きいという問題があった。 By the way, JIS L 0855: 1998 (non-patent document 1, dyeing fastness test method for nitrogen oxide) is a method for measuring the ease of discoloration of the resin by nitrogen oxide, which is one of the causes of yellowing of the resin. In general, discoloration resistance of various resins to nitrogen oxides is evaluated according to the method. However, in this method, nitrogen oxide must be synthesized from sodium sulfite and sulfuric acid for each measurement and used for sample exposure. Finally, gray scale (JIS L 0855: 1998; Non-Patent Document 2, JIS L 0804: 1994) confirms the discoloration state after exposure to nitrogen oxides, so there is a part that depends on the sensation of the person to be measured, so there is a problem of large measurement variations and errors was there.
そこで、本発明の目的は、上記従来技術の問題を解決し、測定のバラツキ・誤差が少なく、窒素酸化物による樹脂の変色度合いを精度良く且つ簡便に測定できる方法を提供することにある。 Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a method capable of measuring the degree of discoloration of the resin due to nitrogen oxides accurately and easily with little measurement variation and error.
本発明者は、上記目的を達成するために鋭意検討した結果、測定の度に窒素酸化物を合成して試験片の暴露に使用するのに代えて、標準ボンベから所定濃度の窒素酸化物を供給して試験片を窒素酸化物に暴露させ、更に、試験片の変色度合いをグレースケールで目視判断することに代えて、色差計で機器分析することで、測定のバラツキ・誤差を大幅に低減でき、更には、測定の簡便さが大幅に向上することを見出し、本発明を完成させるに至った。 As a result of intensive studies to achieve the above object, the present inventor, instead of synthesizing nitrogen oxide for each measurement and using it for exposure of a test piece, a predetermined concentration of nitrogen oxide from a standard cylinder. Supply and expose the test piece to nitrogen oxide, and instead of visually judging the degree of discoloration of the test piece on a gray scale, instrumental analysis with a color difference meter greatly reduces measurement variations and errors. In addition, it has been found that the convenience of measurement is greatly improved, and the present invention has been completed.
即ち、本発明の樹脂の変色試験方法は、樹脂試験片を所定濃度の窒素酸化物に所定温度で所定時間暴露した後、該樹脂試験片の変色進行度合いを色差計で分析することを特徴とする。 That is, the resin discoloration test method of the present invention is characterized in that after the resin test piece is exposed to a predetermined concentration of nitrogen oxide at a predetermined temperature for a predetermined time, the color change progress of the resin test piece is analyzed with a color difference meter. To do.
本発明の樹脂の変色試験方法の好適例においては、前記色差計で樹脂試験片の黄色度ＹＩの変化率ΔＹＩを測定する。この場合、更に精度良く樹脂試験片の変色度合いを測定することができる。 In a preferred example of the resin discoloration test method of the present invention, the rate of change ΔYI of the yellowness YI of the resin test piece is measured with the color difference meter. In this case, the degree of discoloration of the resin test piece can be measured with higher accuracy.
本発明の樹脂の変色試験方法の他の好適例においては、前記樹脂試験片がウレタンフォームからなる。 In another preferred embodiment of the resin discoloration test method of the present invention, the resin test piece is made of urethane foam.
本発明の樹脂の変色試験方法の他の好適例においては、標準ボンベから所定濃度の窒素酸化物を供給して、所定濃度の窒素酸化物雰囲気を調製し、該雰囲気中で前記樹脂試験片を窒素酸化物に暴露する。この場合、試験片の暴露条件を均一にし易いと共に、簡便に樹脂試験片の変色度合いを測定することができる。 In another preferred embodiment of the resin discoloration test method of the present invention, a nitrogen oxide having a predetermined concentration is supplied from a standard cylinder to prepare a nitrogen oxide atmosphere having a predetermined concentration, and the resin test piece is placed in the atmosphere. Exposure to nitrogen oxides. In this case, it is easy to make the exposure condition of the test piece uniform, and the degree of discoloration of the resin test piece can be easily measured.
本発明の樹脂の変色試験方法は、特に好ましくは、
(i)密閉容器内部にウレタンフォーム試験片を設置し、
(ii)該密閉容器に標準ボンベから所定濃度の窒素酸化物を所定量供給して、所定濃度の窒素酸化物雰囲気を調製し、
(iii)該雰囲気中で前記ウレタンフォーム試験片を窒素酸化物に所定温度で所定時間暴露した後、
(iv)該ウレタンフォーム試験片を前記密閉容器から取り出し、
(v)該ウレタンフォーム試験片の黄色度ＹＩの変化率を色差計で分析する。
The resin discoloration test method of the present invention is particularly preferably
(i) Install a urethane foam test piece inside the sealed container,
(ii) supplying a predetermined amount of nitrogen oxide of a predetermined concentration from a standard cylinder to the sealed container to prepare a nitrogen oxide atmosphere of a predetermined concentration;
(iii) after exposing the urethane foam test piece to the nitrogen oxide at a predetermined temperature for a predetermined time in the atmosphere;
(iv) taking out the urethane foam test piece from the sealed container;
(v) The change rate of the yellowness YI of the urethane foam test piece is analyzed with a color difference meter.
本発明によれば、樹脂試験片を所定濃度の窒素酸化物に所定温度で所定時間暴露、好ましくは、標準ボンベから所定濃度の窒素酸化物を供給して樹脂試験片を暴露した後、該樹脂試験片の変色進行度合いを色差計で機器分析することで、窒素酸化物による樹脂の変色度合いを精度良く且つ簡便に分析できる新規試験方法を提供することができる。 According to the present invention, the resin test piece is exposed to a predetermined concentration of nitrogen oxide at a predetermined temperature for a predetermined time, preferably after supplying the predetermined concentration of nitrogen oxide from a standard cylinder to expose the resin test piece, By performing instrumental analysis of the degree of color change of the test piece with a color difference meter, it is possible to provide a new test method capable of accurately and easily analyzing the degree of color change of the resin due to nitrogen oxides.
以下に、本発明を詳細に説明する。本発明の樹脂の変色試験方法は、樹脂試験片を所定濃度の窒素酸化物に所定温度で所定時間暴露した後、該樹脂試験片の変色進行度合いを色差計で分析することを特徴とする。ここで、樹脂試験片を所定濃度の窒素酸化物に所定温度で所定時間暴露することで、試験片の窒素酸化物による暴露条件を統一して、暴露における試験片間のバラツキを低減できる。また、窒素酸化物による暴露で変色した試験片を、色差計で機器分析することで、グレースケールによる目視判断における測定者間のバラツキ等を排除して、誤差及びバラツキ無く、精度良く分析することができる。 The present invention is described in detail below. The resin discoloration test method of the present invention is characterized in that after the resin test piece is exposed to a predetermined concentration of nitrogen oxide at a predetermined temperature for a predetermined time, the degree of color change of the resin test piece is analyzed with a color difference meter. Here, by exposing the resin test piece to a predetermined concentration of nitrogen oxide at a predetermined temperature for a predetermined time, it is possible to unify the exposure conditions of the test piece with the nitrogen oxide and reduce the variation between the test pieces in the exposure. In addition, by analyzing the test piece discolored by exposure to nitrogen oxides with a color difference meter, it is possible to accurately analyze without error and variation by eliminating the variation between the measurers in the visual judgment by gray scale. Can do.
本発明の樹脂の変色試験方法においては、色差計で樹脂試験片の黄色度ＹＩの変化率を測定するのが好ましい。一般に、窒素酸化物による樹脂の変色では、黄色味の増大が顕著であるので、色差計による測定項目、例えば、ＸＹＺ、Ｌab、ＹＩ、Ｗ、ＷＢ等の中でも、黄色度ＹＩを測定し、その変化率ΔＹＩを測定することで、最も簡便で且つ精度良く、樹脂試験片の窒素酸化物による変色度合いを分析することができる。なお、他の測定項目を測定することでも、窒素酸化物による試験片の変色度合いを分析することができるが、通常の白色系ウレタンは、黄色く変色するため、ＹＩを測定することで最も性能を良く把握できる。なお、本発明の変色試験方法において、使用する色差計としては、特に制限はなく、市販の色差計を用いることができ、例えば、日本電色工業株式会社製の「ＺＥ２０００」等を用いることができる。 In the resin discoloration test method of the present invention, it is preferable to measure the rate of change in yellowness YI of a resin test piece with a color difference meter. In general, when the resin is discolored by nitrogen oxides, the increase in yellowness is significant. Therefore, among the measurement items using a color difference meter, for example, XYZ, Lab, YI, W, WB, etc., the yellowness YI is measured. By measuring the change rate ΔYI, it is possible to analyze the degree of discoloration of the resin test piece due to nitrogen oxides most simply and accurately. In addition, it is possible to analyze the degree of discoloration of the test piece due to nitrogen oxides by measuring other measurement items. However, since ordinary white urethane is discolored to yellow, the most performance can be obtained by measuring YI. I can grasp it well. In the discoloration test method of the present invention, the color difference meter to be used is not particularly limited, and a commercially available color difference meter can be used. For example, “ZE2000” manufactured by Nippon Denshoku Industries Co., Ltd. can be used. it can.
本発明の樹脂の変色試験方法は、樹脂を対象とするが、ここで、該樹脂としては、ポリウレタン、ポリエチレン、ポリプロピレン、ナイロン、ポリエステル等が挙げられ、これらの中でも、窒素酸化物による変色が顕著な点で、ポリウレタンが好ましく、該ポリウレタンからなるウレタンフォームを測定対象とするのが特に好ましい。また、本発明の変色試験方法は、精度が良いため、窒素酸化物に対する耐変色性が高く、窒素酸化物による暴露前後での変色が小さい樹脂に対しても、十分に利用することができる。 The resin discoloration test method of the present invention is intended for resins, and examples of the resin include polyurethane, polyethylene, polypropylene, nylon, and polyester. Among these, discoloration due to nitrogen oxides is remarkable. In particular, polyurethane is preferable, and urethane foam made of the polyurethane is particularly preferably measured. Further, since the discoloration test method of the present invention has high accuracy, it can be sufficiently used even for resins having high discoloration resistance to nitrogen oxides and small discoloration before and after exposure to nitrogen oxides.
本発明の樹脂の変色試験方法においては、試験片の窒素酸化物による暴露条件を統一するために、窒素酸化物を所定の濃度で貯蔵する標準ボンベを用い、該標準ボンベから所定濃度の窒素酸化物を供給して、所定濃度の窒素酸化物雰囲気を調製し、該雰囲気中で前記樹脂試験片を窒素酸化物に暴露するのが好ましい。ここで、標準ボンベ中に貯蔵される窒素酸化物の組成は、ＪＩＳ Ｌ ０８５５：１９９８に従って合成される窒素酸化物混合物と同じ組成であるのが好ましいが、これに限られるものではない。なお、窒素酸化物としては、ＮＯ、ＮＯ2等が挙げられる。窒素酸化物を含む標準ボンベとしては、特に限定されるものではなく、例えば、ＮＯを1000ppm含み、Ｎ2でバランスされたボンベ（Ｎ2：ＮＯ＝99.9％：0.1％）等の容易に入手できるものを用いるのが好ましい。窒素酸化物を標準ボンベから供給して試験片の暴露に用いることで、ＪＩＳ Ｌ ０８５５：１９９８に記載の方法における窒素酸化物の合成の作業を排除することができ、測定の簡便性を大幅に向上させることができる。 In the resin discoloration test method of the present invention, in order to unify the exposure conditions of the test piece with nitrogen oxides, a standard cylinder storing nitrogen oxides at a predetermined concentration is used. It is preferable to prepare a nitrogen oxide atmosphere having a predetermined concentration by supplying a product, and to expose the resin test piece to the nitrogen oxide in the atmosphere. Here, the composition of the nitrogen oxide stored in the standard cylinder is preferably the same composition as the nitrogen oxide mixture synthesized according to JIS L 0855: 1998, but is not limited thereto. Examples of nitrogen oxides include NO and NO 2 . As the standard cylinder containing nitrogen oxides is not particularly limited, for example, comprise 1000ppm of NO, Balanced cylinder with N 2 (N 2: NO = 99.9%: 0.1%) readily available, such as It is preferable to use one. By supplying nitrogen oxide from a standard cylinder and using it for exposure of the test piece, it is possible to eliminate the work of nitrogen oxide synthesis in the method described in JIS L 0855: 1998, greatly improving the convenience of measurement. Can be improved.
上記樹脂試験片の窒素酸化物による暴露は、密閉容器内で行うのが好ましく、該密閉容器としては、ＪＩＳ Ｌ ０８５５：１９９８に記載の窒素酸化物試験装置を用いるのが好ましいが、これに限定されるものではない。また、密閉容器に所定量の窒素酸化物を注入して、所定濃度の窒素酸化物雰囲気を調製してもよいが、流通式の容器を用い、所定濃度の含窒素酸化物ガス流をフローさせて、試験片を窒素酸化物に暴露させてもよい。ここで、含窒素酸化物ガス流をフローさせて、試験片を窒素酸化物に暴露させる場合、窒素酸化物を所定濃度で含有するガスをボンベから所定時間供給して、試験片を窒素酸化物に暴露させるのが好ましい。ここで、ボンベからの含窒素酸化物ガスの供給条件は、ボンベの圧力やガス供給ラインの管径等の影響を受けるが、適当なバルブ、フローコントローラー等を用いて、単位時間あたりの供給量を制御することで、一定とすることができる。また、含窒素酸化物ガスにおける、窒素酸化物以外のガスとしては、窒素やアルゴンが挙げられる。 The exposure of the resin test piece with nitrogen oxides is preferably carried out in a sealed container. As the sealed container, it is preferable to use a nitrogen oxide test apparatus described in JIS L 0855: 1998, but the present invention is not limited thereto. Is not to be done. In addition, a nitrogen oxide atmosphere having a predetermined concentration may be prepared by injecting a predetermined amount of nitrogen oxide into a sealed container, but a flow-type container is used to flow a nitrogen-containing oxide gas flow having a predetermined concentration. The test piece may be exposed to nitrogen oxides. Here, when the nitrogen-containing oxide gas flow is caused to flow and the test piece is exposed to nitrogen oxide, a gas containing nitrogen oxide at a predetermined concentration is supplied from a cylinder for a predetermined time, and the test piece is removed from the nitrogen oxide. It is preferable to be exposed to. Here, the supply condition of nitrogen-containing oxide gas from the cylinder is affected by the cylinder pressure and the gas supply line diameter, etc., but the supply amount per unit time using an appropriate valve, flow controller, etc. By controlling, it can be made constant. Moreover, nitrogen and argon are mentioned as gas other than nitrogen oxide in nitrogen-containing oxide gas.
本発明の変色試験方法は、ウレタンフォームの変色を対象とする場合、具体的には、(i)密閉容器内部にウレタンフォーム試験片を設置し、(ii)該密閉容器に標準ボンベから所定濃度の窒素酸化物を所定量供給して、所定濃度の窒素酸化物雰囲気を調製し、(iii)該雰囲気中で前記ウレタンフォーム試験片を窒素酸化物に所定温度で所定時間暴露した後、(iv)該ウレタンフォーム試験片を前記密閉容器から取り出し、(v)該ウレタンフォーム試験片の黄色度ＹＩの変化率（ΔＹＩ）を色差計で分析することで実施するのが好ましい。この場合、ウレタンフォームの変色度合いを、誤差・バラツキ無く、精度良く且つ簡便に分析することができる。 When the discoloration test method of the present invention is intended for discoloration of urethane foam, specifically, (i) a urethane foam test piece is installed inside a sealed container, and (ii) a predetermined concentration from a standard cylinder is placed in the sealed container. A nitrogen oxide atmosphere of a predetermined concentration was prepared, and (iii) the urethane foam test piece was exposed to the nitrogen oxide at a predetermined temperature for a predetermined time in the atmosphere (iv) The urethane foam test piece is preferably taken out of the sealed container, and (v) the change rate of yellowness YI (ΔYI) of the urethane foam test piece is preferably analyzed by a color difference meter. In this case, the degree of discoloration of the urethane foam can be analyzed accurately and easily without errors and variations.
なお、本発明の変色試験方法における試験片の暴露条件としては、窒素酸化物の濃度は、200〜2000ppmの範囲が好ましく、950〜1050ppmの範囲がより好ましく、20〜30℃で、12〜14分間暴露するのが好ましい。暴露条件が弱すぎる（濃度が低過ぎたり、温度が低過ぎたり、暴露時間が短過ぎる）と、変色が小さく、精度良く分析することができず、暴露条件が強すぎる（濃度が高過ぎたり、温度が高過ぎたり、暴露時間が長過ぎる）と、測定の危険度が増す。 In addition, as an exposure condition of the test piece in the discoloration test method of the present invention, the concentration of nitrogen oxides is preferably in the range of 200 to 2000 ppm, more preferably in the range of 950 to 1050 ppm, at 20 to 30 ° C., and 12 to 14 Exposure for minutes is preferred. If the exposure conditions are too weak (concentration is too low, temperature is too low, or the exposure time is too short), the discoloration is small and the analysis cannot be performed accurately, and the exposure conditions are too strong (concentration is too high) If the temperature is too high or the exposure time is too long), the risk of measurement increases.
以下に、実施例を挙げて本発明を更に詳しく説明するが、本発明は下記の実施例に何ら限定されるものではない。 Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples.
ポリオール［三洋化成製, ＧＰ３０００］100質量部、水 2.5質量部、三級アミン触媒［三共エアプロ製, ダブコ３３ＬＶ］0.25質量部、シリコーン系整泡剤［東レダウシリコン製, ＳＨ１９２］0.8質量部、金属触媒［スタナスオクトエート］0.2質量部及びイソシアネート［Ｔ−８０（インデックス）］105質量部に、紫外線吸収剤及びリン系酸化防止剤を添加した配合からなるポリウレタン原料を常法に従って25℃で発泡させてポリウレタンフォームＡを準備した。また、上記ポリウレタンフォームＡに用いたポリウレタン原料から紫外線吸収剤及びリン系酸化防止剤を除いた配合のポリウレタン原料を常法に従って25℃で発泡させてポリウレタンフォームＢを準備した。 Polyol [manufactured by Sanyo Chemical Co., Ltd., GP3000] 100 parts by mass, water 2.5 parts by mass, tertiary amine catalyst [manufactured by Sankyo Airpro, Dabco 33LV] 0.25 parts by mass, silicone-based foam stabilizer [manufactured by Toray Dow Silicone, SH192] 0.8 parts by mass, According to a conventional method, a polyurethane raw material composed of 0.2 parts by mass of a metal catalyst [Stanas octoate] and 105 parts by mass of an isocyanate [T-80 (index)] is added at 25 ° C. according to a conventional method. Polyurethane foam A was prepared by foaming. Further, a polyurethane foam B was prepared by foaming a polyurethane raw material having a composition obtained by removing the ultraviolet absorber and the phosphorus-based antioxidant from the polyurethane raw material used in the polyurethane foam A at 25 ° C. according to a conventional method.
（実施例１及び２）
上記ポリウレタンフォームＡ及びＢからなる試験片１１枚をそれぞれＪＩＳ Ｌ ０８５５と同様の容器中に配置して、1000ppmの窒素酸化物（ＮＯ＝1000ppm）を貯蔵する標準ボンベ（残部：窒素）から該容器にガスを供給して、25℃で13分間、試験片を窒素酸化物に暴露させた。ここで、標準ボンベの２次圧（レギュレーターで調整）は0.5kg/cm2であり、3分間ガスを供給した。次に、容器から、試験片を取り出し、日本電色工業株式会社製の色差計「ＺＥ２０００」を用いて、試験片の黄色度ＹＩを測定した。また、窒素酸化物に暴露していない試験片の黄色度ＹＩを測定し、暴露前後の黄色度変化率ΔＹＩを測定した。また、ΔＹＩのバラツキの尺度として３σを計算した。結果を表１に示す。
(Examples 1 and 2)
11 test pieces made of the above polyurethane foams A and B were respectively placed in a container similar to JIS L 0855, and the container was taken from a standard cylinder (remainder: nitrogen) storing 1000 ppm of nitrogen oxide (NO = 1000 ppm). The test piece was exposed to nitrogen oxide at 25 ° C. for 13 minutes. Here, the secondary pressure of the standard cylinder (adjusted with a regulator) was 0.5 kg / cm 2 , and gas was supplied for 3 minutes. Next, the test piece was taken out from the container, and the yellowness YI of the test piece was measured using a color difference meter “ZE2000” manufactured by Nippon Denshoku Industries Co., Ltd. Moreover, the yellowness degree YI of the test piece which was not exposed to nitrogen oxide was measured, and yellowness change rate (DELTA) YI before and behind exposure was measured. Further, 3σ was calculated as a measure of variation in ΔYI. The results are shown in Table 1.
（比較例１及び２）
比較例として、ＪＩＳ Ｌ ０８５５：１９９８に準拠して合成した窒素酸化物によってポリウレタンフォームＡ及びＢからなる試験片を変色させ、上記色差計で黄色度変化率ΔＹＩをそれぞれ測定し、表１に示す結果を得た。
(Comparative Examples 1 and 2)
As a comparative example, the test piece made of polyurethane foams A and B was discolored with nitrogen oxides synthesized according to JIS L 0855: 1998, and the yellowness change rate ΔYI was measured with the above color difference meter, as shown in Table 1. The result was obtained.
表１からも明らかなように、本発明の変色試験方法によれば、測定値のバラツキを非常に小さく抑制することができ、精度良く、ポリウレタンフォームの変色度合いを測定することができる。 As is clear from Table 1, according to the discoloration test method of the present invention, variation in measured values can be suppressed to a very small level, and the degree of discoloration of polyurethane foam can be measured with high accuracy.
Claims (5)
(ii)該密閉容器に標準ボンベから所定濃度の窒素酸化物を所定量供給して、所定濃度の窒素酸化物雰囲気を調製し、
(iii)該雰囲気中で前記ウレタンフォーム試験片を窒素酸化物に所定温度で所定時間暴露した後、
(iv)該ウレタンフォーム試験片を前記密閉容器から取り出し、
(v)該ウレタンフォーム試験片の黄色度ＹＩの変化率を色差計で分析することを特徴とする請求項１〜５のいずれかに記載の樹脂の変色試験方法。 (i) Install a urethane foam test piece inside the sealed container,
(ii) supplying a predetermined amount of nitrogen oxide of a predetermined concentration from a standard cylinder to the sealed container to prepare a nitrogen oxide atmosphere of a predetermined concentration;
(iii) after exposing the urethane foam test piece to the nitrogen oxide at a predetermined temperature for a predetermined time in the atmosphere;
(iv) taking out the urethane foam test piece from the sealed container;
(v) The change rate of the yellowness YI of the urethane foam test piece is analyzed with a color difference meter, The resin discoloration test method according to any one of claims 1 to 5.
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| US11579127B2 (en) | 2018-06-29 | 2023-02-14 | Asp Global Manufacturing Gmbh | Apparatus, method, and system for indication of an oxidative treatment |
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