Method for preparing paraffin/AKD composite neutral paper-making glue blending agent

Abstract

The invention relates to a preparation method of paraffin wax / AKD complex type neutral paper-making sizing agent. The step is as follows: firstly, AKD and paraffin wax powder are melted in AKD solution; secondly, compound emulsifying agent after being heated is added in melted AKD solution and mixed with a quick shearing mixing machine; thirdly, a rotating speed of the quick shearing blending machine is improved and preheating water is added to lead the formed AKD solution to performing emulsification nearby a W / O to O / W inversion point; quick mixing is performed and the preheating water is added and the mixing is continuously performed; fourthly, the water solution of flocculating agent PAC is added, and the mixing is continuously performed; fifthly, the mixing is stopped and the cold water is used for quickly performing cooling and cool down, and then the finished product of the paraffin wax / AKD complex-typed neutral paper-making sizing agent emulsion is produced. The complex-typed neutral sizing agent produced by the invention has the advantages that the holding rate is high, the effect on the physical property of the paper is small, and the emulsion is stable.

Description

technical field

[0001] The invention belongs to the field of papermaking, in particular to a method for preparing a paraffin / AKD composite neutral papermaking sizing agent. Background technique

[0002] In the papermaking process, sizing the paper is a very important process in the wet end of papermaking. The medium-alkaline sizing technology in the medium-alkaline papermaking process is a new technology developed from abroad in the 1970s. In China, neutral sizing has been used since the 1980s. After nearly 20 years of hard work, The research on neutral sizing has achieved rapid development, especially AKD neutral sizing, which has developed the fastest among various medium-alkaline sizing and manufacturing technologies.

[0003] Using AKD (alkyl ketene dimer) as a sizing agent for medium-alkaline papermaking uses calcium carbonate as a filler, which can save about 25% of fiber raw materials and greatly reduce costs. At the same time, the buffering effect of calcium carbona...

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