RUBBER-BASED CROSSLINKING FOAM MOLDED BODY AND MANUFACTURING METHOD THEREFOR

• Main Authors: IKEMOTO TAKESHI, HASE TOMOHIRO, HAYASHI SHINJI
• Format: Patent
• Language: English; Japanese
• Published: 10.11.2016
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

PROBLEM TO BE SOLVED: To provide a rubber-based crosslinking foam molded body small in dimension shrinkage after molding, excellent in mechanical strength such as shape stability, abrasion resistance, and tensile strength, and capable of easily adding various colors other than black even though it is a rubber sponge molded body with high foaming and low density.SOLUTION: There is provided a rubber-based crosslinking foam molded body consisting of a crosslinking foam sponge body obtained by heat pressure molding while conducting a crosslink reaction and a foaming reaction at same time, the crosslinking foam sponge body is constituted as an elastomer by containing the crosslinking agent in a raw rubber in advance, with a specific gravity of less than 0.7 by containing the foaming agent in advance and with a status that cellulose nanofiber is dispersed with more dense in an inner wall of each air bubble cells of the foamed sponge body by containing the cellulose nanofiber at 1.0 to 20.0 mass% in the raw rubber in advance as well as dispersed in a wall thickness between each air bubble cells.SELECTED DRAWING: None 【課題】高発泡、低比重のゴムスポンジ成形体にもかかわらず、成型後の寸法収縮が小さくて形状安定性、耐摩耗性、引張り強度等の機械的強度に優れ、また黒色以外の各種色彩を容易に付与することができるゴム系架橋発泡成形体の提供を課題とする。【解決手段】架橋反応及び発泡反応を同時的に行いながら加熱加圧成形して得られる架橋発泡スポンジ体からなるゴム系架橋発泡成形体であって、前記架橋発泡スポンジ体は、架橋剤を予め生ゴムに含有させておくことで弾性体に構成すると共に、発泡剤を予め生ゴムに含有させておくことでその比重を０．７未満に構成し、且つセルロースナノファイバーを予め生ゴムに１．０〜２０．０質量％含有させておくことで、発泡したスポンジ体の各気泡セルの内壁にセルロースナノファイバーをより密に分散させると共に各気泡セル間の肉厚内にもセルロースナノファイバーを分散させた状態に構成してある。【選択図】 なし