JP2009197149A5

JP2009197149A5 -

Info

Publication number: JP2009197149A5
Application number: JP2008041032A
Authority: JP
Filing date: 2008-02-22
Publication date: 2011-04-07

Description

共重合体ラテックスのゲル含有量の測定
室温（２３℃）雰囲気にて２４時間乾燥させ、共重合体ラテックスのフィルムを作成する。そのフィルムを約１ｇ秤量し、これを４００ｍｌのメチルエチルケトンに入れ４８時間膨張溶解させる。その後、これを３００メッシュの金網で濾過し、金網に捕捉されたメチルエチルケトン不溶部を乾燥後秤量し、この重量のはじめのフィルム重量に占める割合をゲル含有量として重量％で算出した。
Measurement of gel content of copolymer latex Drying is carried out at room temperature (23 ° C.) for 24 hours to prepare a film of copolymer latex. About 1 g of the film is weighed and placed in 400 ml of methyl ethyl ketone and allowed to expand and dissolve for 48 hours. Thereafter, this was filtered through a 300-mesh wire mesh, the methyl ethyl ketone insoluble part captured by the wire mesh was dried and weighed, and the ratio of this weight to the initial film weight was calculated as a gel content in wt%.

共重合体ラテックスの結合酸量、非結合酸量の測定
５重量％に希釈した共重合体ラテックス１００ｇに０．１Ｎの水酸化ナトリウム水溶液を５０ｇ、四塩化炭素を３ｇ添加後、１時間攪拌した。その後、遠心分離装置にてラテックス粒子を遠心沈降させ上澄み層とラテックス粒子層を分離した。得られた二層をそれぞれ純水で希釈し、０．１Ｎの塩酸を過剰量添加した後、０．１Ｎの水酸化ナトリウム水溶液で逆滴定し、得られた電気伝導度曲線から粒子結合酸量（Ａ（ｍｅｑ／ｇ））、および粒子非結合酸量（Ｂ（ｍｅｑ／ｇ））をラテックス固形分１ｇあたりのミリ当量（ｍｅｑ）として求めた。 Measurement of bound acid amount and unbound acid amount of copolymer latex 100 g of copolymer latex diluted to 5% by weight was added with 50 g of 0.1N sodium hydroxide aqueous solution and 3 g of carbon tetrachloride, followed by stirring for 1 hour. . Thereafter, the latex particles were centrifugally settled by a centrifugal separator to separate the supernatant layer and the latex particle layer. Each of the obtained two layers was diluted with pure water, and an excess amount of 0.1N hydrochloric acid was added, followed by back titration with a 0.1N aqueous sodium hydroxide solution. (A (meq / g)) and the amount of unbound acid (B (meq / g)) were determined as milliequivalent (meq) per gram of latex solid content.