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    Sodium lignosulfonate water reducing agent, made from the sulfite pulping waste liguid by chemical modification processing ,with medium molecular weight, lower reducing sugar content, for the concrete admixture, from the low content, low ags content,strong adaptability to the characteristics of cement, the most significant feature is the combination of naphthalene superplasticizer, the liguid

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    The layers were formed by immersing the membrane into an aqueous solution of a polycondensation product of sodium naphthalene sulfonate and formaldehyde or polystyrene sulfonic acid. The thickness of the additional layer could be increased by increasing the immersion period.

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