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Composite method of composite porcelain clay filler

A technology of porcelain clay and uniform mixing, which is applied in the direction of fibrous fillers, addition of inorganic compounds, dyeing polymer organic compounds, etc., which can solve the problems of reducing paper quality, weakening paper strength, and increasing costs, so as to improve the retention rate of fillers , increase the whiteness of paper, and save the amount of fiber

Inactive Publication Date: 2008-12-24
颜进华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the one-way retention rate of porcelain clay filler is about 15%, and the retention rate is only about 50% after repeated reuse of white water. Generally, expensive retention aids are added to help retention, and the retention rate is only 70-90% ( Depending on the paper type and process), not only the cost will increase, but also the filler should not be added too much
The main reason is that there is no binding force between the porcelain clay filler and the fiber, so it cannot be filled too much, otherwise it will easily cause powder and hair loss after the paper is formed, which will weaken the strength of the paper and reduce the quality of the paper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A composite method for composite china clay filler, comprising the steps of:

[0020] Disperse china clay (filler grade, 100% particles are less than 10 microns, no requirement for whiteness, used for cardboard when whiteness is low; thin paper when whiteness is high. The same below) into a dispersion suspension with a mass concentration of 5%, The intermediate product is obtained after uniformly mixing with fully dissolved and gelatinized starch aqueous solution with a mass concentration of 20%; the mass ratio of china clay to starch is 1:1. Add palmitic acid (straight-chain C12 fatty acid) to the above intermediate product (the mass ratio of fatty acid to starch is 1:20), adjust the pH to 10, keep it at 85°C for another 20 minutes, and keep stirring throughout the process to obtain a uniform mixture ; Mix the above-mentioned homogeneous mixed solution with the acidic electrolyte solution hydrochloric acid; hydrochloric acid: the volume ratio of the homogeneous mixed s...

Embodiment 2

[0022] A composite method for composite china clay filler, comprising the steps of:

[0023] Dispersing china clay into a dispersion suspension with a mass concentration of 40%, and mixing evenly with a fully dissolved and gelatinized starch aqueous solution with a mass concentration of 1%, to obtain an intermediate product, the mass ratio of the china clay to oxidized starch is 50:1; The above-mentioned intermediate product is spray-dried to obtain a powdery composite filler, that is, a composite china clay filler. Adding 15% (mass percentage) of the composite china clay filler of the present invention to paper with a weight of 80 grams increases the tensile strength of the paper by 10-15%.

Embodiment 3

[0025] A composite method for composite china clay filler, comprising the steps of:

[0026] Mix china clay and oxidized starch, add water and mix to form a mixture with a mass concentration of 40%, the mass ratio of china clay and oxidized starch is 1:20, heat the above mixture to 90°C, keep it warm for 30 minutes, make the mixture fully gelatinized and stir Evenly, an intermediate product is obtained, and the intermediate product is spray-dried to obtain a powdery composite filler, that is, a composite china clay filler. Adding 15% (mass percentage) of the composite china clay filler of the present invention to paper with a weight of 80 grams increases the tensile strength of the paper by 20%.

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PUM

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Abstract

The invention discloses a complex method for a composite china clay filler. The method comprises the following steps of: dispersing china clay into a dispersed suspension which is mixed evenly with an aqueous solution of a macromolecular substance to obtain an intermediate product; or mixing the china clay and the macromolecular substance, adding water into the mixed solution to mix and heating the mixed solution to 85 to 95 DEG C, keeping the temperature for 30 minutes, and obtaining the intermediate product; directly drying the intermediate product to obtain the composite china clay filler; or mixing the intermediate product and fatty acid, regulating a PH value to 10, stirring the mixture at a temperature of between 85 and 95 DEG C, keeping the temperature for 20 minutes, and obtaining a homogeneous mixed liquid; and mixing the mixed liquid and an acidic electrolyte solution, stirring the mixed solution evenly, removing a supernatant after keeping stand, and obtaining sub-layer substance which is just the composite china clay filler. The method can improve the hydrophilicity of the china clay and fibers, increase the use level of the china clay, and remarkably improve paper strength. The method can also improve filler retention and paper whiteness, reduce the load of wastewater treatment and further save the use level of the fibers.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to a method for compounding composite china clay fillers used in papermaking and filling processes. Background technique [0002] China clay, also known as kaolin, is a commonly used white filler and pigment for papermaking. At present, kaolin still has the largest consumption in the entire paper industry pigment market, but it is mainly used in the coating and cardboard paper filler market. It is generally not used in the production of writing and cultural paper. , the other main fillers are calcium carbonate and talcum powder, which are the main minerals added in the papermaking process. The main purpose of filling is to increase the opacity and whiteness, improve the printing performance of the paper, and reduce the production cost. It is an important step in the papermaking process. [0003] At present, paper mills directly add china clay fillers to the slurry. Sin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/28C09C3/10D21H17/68
Inventor 颜进华李向华许杰林陈晓明崔益智阮久行
Owner 颜进华