| 摘要 |
<p>The de-inking of paper pulp is rendered more efficient and capable of producing a high quality recycled paper for printing purposes by the addition of surfactants having a chemical character similar to surfactants naturally present in the pulp. The surfactants may be in the form of hemicellulose which include polysaccharides and a small proportion of side-chain carboxyl groups. Methods for the manufacture of artificial surfactants similar to the surfactants present in the pulp are described, such as surfactants being copolymers made for example from vinyl acetate and acrylic or maleic acid, the conversion being completed by transesterification with methanol in the presence of sodium methoxide. </p> |
