JP2020503228A - 人造大理石用組成物 - Google Patents
人造大理石用組成物 Download PDFInfo
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Abstract
Description
本発明のバインダー樹脂は、アクリル系樹脂及び不飽和ポリエステル樹脂のうち1種以上を含んでもよい。
本発明の無機充填材としては、シリカ、アルミナ、炭酸カルシウム、水酸化カルシウム、水酸化アルミニウム、水酸化マグネシウム、パーライト、バーミキュライト、スメクタイト及びベントナイトなどが使用されてもよく、酸化亜鉛は除外される。このうち、水酸化アルミニウムは、透明で且つ美麗な外観の面で好ましく適用され得る。
本発明に使用される酸化亜鉛は、フォトルミネッセンスの測定時、370nm〜390nm領域のピークAと450nm〜600nm領域のピークBの大きさの比(B/A)が約0.01〜約1、具体的には約0.01〜約0.5、より具体的には約0.1〜約0.3、例えば、0.01、0.05、0.1、0.15、0.2、0.25、0.3、0.35、0.4、0.45、0.5、0.6、0.65、0.7、0.75、0.8、0.85、0.9、0.95、1で、窒素ガス吸着法を用いてBET分析装備で測定したBET表面積は、約10m2/g以下、具体的には約1m2/g〜約10m2/g、より具体的には約1m2/g〜約7m2/g、例えば、1m2/g、2m2/g、3m2/g、4m2/g、5m2/g、6m2/g、7m2/g、8m2/g、9m2/g、10m2/gであってもよい。
ポリメチルメタクリレート(PMMA)30重量%をメチルメタクリレート70重量%に溶解して作ったシロップを使用した。
平均粒径サイズが10μmである水酸化アルミニウムを使用した。
下記の表1の酸化亜鉛を使用した。
(1)平均粒子サイズ(単位:μm):粒度分析器(ベックマン・ コールター株式会社のレーザー回折式粒度分布測定装置(Laser Diffraction Particle Size Analyzer)LS I3 320装備)を用いて平均粒子サイズ(体積平均)を測定した。
前記各構成成分の含量を下記の表2及び表3に記載の組成によって調節し、トリメチロールプロパントリメタクリレート、n−ドデシルメルカプタン、消泡剤、分散剤及び重合開始剤を添加して混合した人造大理石用組成物を製造して撹拌させた後、真空脱泡を経て80℃の温度で硬化させることによって人造大理石を製造した。
(1)耐候性評価(色相変化(ΔE)):50mm×90mm×3mmサイズの射出試験片に対して色差計(コニカミノルタ株式会社のCM−3700A)を用いて初期色相(L0 *、a0 *、b0 *)を測定し、前記射出試験片に対してSAE J 1960に基づいて、3,000時間にわたって耐候性テストを行い、色差計を用いてテストした後、色相(L1 *、a1 *、b1 *)を測定し、下記の数式2によって色相変化(ΔE)を算出した。
Claims (13)
- バインダー樹脂;
酸化亜鉛を除外した無機充填材;及び
酸化亜鉛;を含み、
前記酸化亜鉛は、フォトルミネッセンスの測定時、370nm〜390nm領域のピークAと450nm〜600nm領域のピークBの大きさの比(B/A)が約0.01〜約1で、BET分析装備で測定したBET表面積が約10m2/g以下である人造大理石用組成物。 - 前記人造大理石用組成物は、バインダー樹脂100重量部、酸化亜鉛を除外した無機充填材約100重量部〜約300重量部、及び酸化亜鉛約1重量部〜約10重量部を含む、請求項1に記載の人造大理石用組成物。
- 前記バインダー樹脂は、アクリル系樹脂及び不飽和ポリエステル樹脂のうち1種以上を含む、請求項1に記載の人造大理石用組成物。
- 前記バインダー樹脂は、ポリ(メタ)アクリレートと(メタ)アクリレートモノマーとの混合物であることを特徴とする、請求項1に記載の人造大理石用組成物。
- 前記無機充填材は、シリカ、アルミナ、炭酸カルシウム、水酸化カルシウム、水酸化アルミニウム、水酸化マグネシウム、パーライト、バーミキュライト、スメクタイト及びベントナイトのうち1種以上を含む、請求項1に記載の人造大理石用組成物。
- 前記酸化亜鉛は、平均粒子サイズが約0.5μm〜約3μmである、請求項1に記載の人造大理石用組成物。
- 前記酸化亜鉛は、X線回折(X−ray diffraction、XRD)の分析時、ピーク位置2θ値が約35゜〜約37゜の範囲で、下記の数式1による微小結晶のサイズ値が約1,000Å〜約2,000Åであることを特徴とする、請求項1に記載の人造大理石用組成物:
前記数式1において、Kは形状係数で、λはX線波長で、βはX線回折ピークのFWHM値で、θはピーク位置値である。 - 前記無機充填材の平均粒径サイズは、前記酸化亜鉛の平均粒径サイズより大きいことを特徴とする、請求項1に記載の人造大理石用組成物。
- 前記無機充填材と前記酸化亜鉛の平均粒径サイズの比は約0.3:1〜約200:1である、請求項8に記載の人造大理石用組成物。
- 前記人造大理石用組成物は、マーブルチップ、架橋剤、架橋促進剤、硬化剤、硬化促進剤、重合開始剤、消泡剤、分散剤、カップリング剤及び顔料のうち1種以上をさらに含むことを特徴とする、請求項1に記載の人造大理石用組成物。
- 前記人造大理石用組成物は、50mm×90mm×3mmサイズの射出試験片に対して色差計を用いて初期色相(L0 *、a0 *、b0 *)を測定し、前記射出試験片に対してSAE J 1960に基づいて、3,000時間にわたって耐候性テストを行い、色差計を用いてテストした後、色相(L1 *、a1 *、b1 *)を測定し、下記の数式2によって算出した色相変化(ΔE)が約0〜約3である、請求項1に記載の人造大理石用組成物:
前記数式2において、ΔL*は、恒温恒湿試験前後のL*値の差(L1 *−L0 *)で、Δa*は、恒温恒湿試験前後のa*値の差(a1 *−a0 *)で、Δb*は、恒温恒湿試験前後のb*値の差(b1 *−b0 *)である。 - 前記人造大理石用組成物は、JIS Z 2801抗菌評価法に基づいて、5cm×5cmサイズの試験片に黄色ブドウ球菌及び大腸菌を接種し、下記の数式3によって算出した黄色ブドウ球菌に対する抗菌活性値が約2.0〜約7.0で、大腸菌に対する抗菌活性値が約2.0〜約6.5である、請求項1に記載の人造大理石用組成物:
前記数式3において、M1は、ブランク試験片に対する35℃、RH90%の条件で24時間培養した後の細菌の数で、M2は、人造大理石試験片に対する35℃、RH90%の条件で24時間培養した後の細菌の数である。 - 請求項1から12のいずれか1項による人造大理石用組成物から形成された人造大理石。
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