抄録
Effect of zinc fluoroborate (Zn(BF4)2 ) catalyst in the treatment of acrylic acid grafted polypropylene fabric with tris (1-aziridinyl) phosphine oxide (APO) was studied.
Weight increase (resin add-on) by APO-treatment and moisture regain of the polypropylene fabrics grafted with acrylic acid and further treated with dimethylformamide solution containing 5% APO are nearly equal regardless of the presence of Zn(BF4)2, while the weight increase of original ungrafted polypropylene fabric treated with APO and Zn(BF4)2 is higher than that of the sample treated without Zn(BF4)2. These facts suggest that the grafted acrylic acid chains have some catalytic action in this treatment and use of Zn(BF4)2 is not always necessary in the case of the grafted fabrics.
As Zn(BF4)2 has some deteriorative effect upon thermooxidative stability (measured by retention of warp tensile strength of the fabric after heat exposure at 100°C) of original polypropylene and the grafted polypropylene fabrics treated with APO-Zn(BF4)2 or Zn(BF4)2 alone, the elimination of use of Zn(BF4)2 catalyst in the treatment of the grafted fabrics with APO results in better thermooxidative stability of the fabrics and also some practical advantages, such as storage stability of the treating APO solution, etc.
Further experiments were made on the thermooxidative stability of the grafted polypropylene fabrics treated with phosphorus-containing compound (butyl acid phosphate-metal acetate system) or nitrogen-containing resins (methylol melamine and ethyleneurea), and no improving effects were observed with these treatments.
