Water-absorbent article and method for producing the same
An absorbent article and article technology, applied in the direction of chemical instruments and methods, layered products, other chemical processes, etc., can solve the problems of damaged packaging, deterioration of wearing feeling, and unfavorable resilience.
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preparation example 1
[0194] Preparation of Water Absorbent Resin Complex
[0195] Partially neutralized acrylic acid was prepared by adding 3.3 parts by weight of water to 100 parts by weight of acrylic acid, and then adding thereto 133.3 parts by weight of a 25% by weight aqueous sodium hydroxide solution at 25° C. or lower under cooling. An aqueous solution having a monomer concentration of 50% by weight and a degree of neutralization of 60% by mole.
[0196] Then, by adding 0.14 parts by weight of N,N'-methylenebisacrylamide as a crosslinking agent and 4.55 parts by weight of a 31% by weight aqueous hydrogen peroxide solution as an oxidizing agent to 100 parts by weight of a partially neutralized acrylic acid aqueous solution to prepare solution A.
[0197] Separately, prepared by adding 0.14 parts by weight of N,N'-methylenebisacrylamide as a crosslinker and 0.57 parts by weight of L-ascorbic acid as a reducing agent to 100 parts by weight of the same partially neutralized aqueous acrylic aci...
preparation example 2-6 and preparation example 13
[0203] A product comprising a water-absorbent resin composite was prepared in the same manner as in Example 1 except for the modified fiber material, average fiber length, and average fiber size shown in Table 1.
[0204] In Preparation Example 5, polyethylene terephthalate (PET) fibers having a fiber diameter of 1.7 decitex, a length of 0.9 mm, and a contact angle with water of 80° were used. In Preparation Example 6, a nylon-type fiber () having the same fiber diameter and length but with water contact angle of 50° was used at a ratio of 1:1 with a fiber diameter of 1.7 decitex, a length of 0.9 mm, and a water contact angle of 50°. A fiber mixture of rayon () with a contact angle of 0°. In Preparation Example 13, polypropylene type (PP) (with a fiber diameter of 1.5 dtex, a fiber length of 2.5 mm, and a contact angle with water of 90°) and polyethylene type (PE) was used in a ratio of 1:1. A mixture of fibers having the same fiber diameter and length, but a contact angle wi...
preparation example 7
[0207] Preparation of Water Absorbent Resin Complex
[0208] According to the examples of JP-A-63-63723, a water-absorbent resin composite was produced by the following method.
[0209] 45.0 g of acrylic acid and 1.5 g of distilled water were put into a 200 mL beaker, cooled at 35° C. or lower, and the mixture was neutralized with 60.0 g of 25% aqueous sodium hydroxide solution to prepare a partially neutralized aqueous solution of acrylic acid (mono The body concentration is 50% by weight, and the degree of neutralization is 60% by mole). 41.9 mg of N,N'-methylenebisacrylamide and 0.31 g of L-ascorbic acid were dissolved in a partially neutralized aqueous acrylic acid solution to obtain a mixed monomer aqueous solution.
[0210] The top surface of the 300 mL stainless steel beaker was completely sealed with a polyester sheet. Then dig holes in the upper plate. A rubber tube was inserted into the resulting hole, and the inner atmosphere of the beaker was sufficiently replac...
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