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

A neutral sizing agent and composite technology, applied in the field of papermaking, can solve the problems of slow response, no reports of compound use of paraffin wax and AKD, etc., achieve small impact, improve the sizing degree of paper off the machine, and improve The effect of economic benefits

Inactive Publication Date: 2008-04-30
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] During the use of AKD sizing agent, some problems often occur: (1). AKD sizing agent is a reactive sizing agent, which reacts slowly and requires a certain curing time
[0011] Usually, it is used in combination with paraffin wax and rosin glue, and there is no report on the compound use of paraffin wax and AKD

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of preparation of paraffin / AKD composite neutral sizing agent:

[0033] (1). Mix and melt 10g of AKD and 2.5g of paraffin in a 70°C water bath, and preheat the emulsifier acrylamide and water respectively, and the preheating temperature is 65°C.

[0034] (2). Add 9 ml of emulsifier acrylamide into the melted AKD and stir for 1 minute at 10000 r / min with a fast shear mixer.

[0035] (3). Increase the speed of the fast shear mixer to 22000r / min and add 20ml of preheated water to emulsify the emulsion near the conversion point from W / O to O / W; after 2 minutes of rapid stirring, add 60ml of preheated water to continue stirring 2 minutes.

[0036] (4). Add 10 ml of an aqueous solution containing 0.5 g of PAC, and continue stirring for 1 minute.

[0037] (5). Stop stirring and quickly cool down with cold water to obtain the finished compound sizing agent emulsion. The particle size of this emulsion is 1268nm, and the Zeta potential is 38mV.

Embodiment 2

[0039] According to the above-mentioned same procedure, carry out embodiment 1 repeatedly, change paraffin consumption into 5g, make composite sizing agent emulsion. The particle size of this emulsion is 1250nm, and the Zeta potential is 37mV.

Embodiment 3

[0041] According to the above-mentioned same procedure, carry out embodiment 1 repeatedly, change paraffin consumption into 10g, make composite sizing agent emulsion. The particle size of this emulsion is 1283nm, and the Zeta potential is 34mV.

[0042] The advanced nature of the present invention is further illustrated below by two application examples:

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16
Inventor 陈夫山金新华邢仁卫
Owner TIANJIN UNIV OF SCI & TECH
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