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Modified calcium sulfate crystal whisker papermaking filler, preparation method and applications thereof

A calcium sulfate whisker and paper-making filler technology, applied in the field of papermaking, can solve the problems of inability to apply large-scale papermaking industrial production, crystal structure and performance damage, low retention rate of calcium sulfate whisker, etc., to expand the application field of whiskers , Increase the added value of whiskers and improve the whiteness

Active Publication Date: 2013-01-02
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0003] Calcium sulfate whiskers have the basic properties of paper-making fillers such as high purity, high whiteness, low abrasion, acid and alkali resistance, etc. However, a large number of studies have proved that calcium sulfate whiskers and Hydration reaction is very easy to occur after contact with water, resulting in the destruction of its crystal structure and performance, and the loss of the characteristics of whiskers; when it is directly used as a paper-making filler, the retention rate of calcium sulfate whiskers in the wire section of the paper machine is very low, and due to its High solubility, a large amount of calcium ions and sulfate ions will be generated in the white water system of the paper machine, which will lead to a series of problems such as increased consumption of chemicals in the wet end of the paper machine, and reduced operating performance of the paper machine
Document 1 (Chen Xuexi, Cui Bo, Yin Jinhua, Application of Phosphogypsum Whiskers in Papermaking, Heilongjiang Papermaking, 2007 (2): 4-5), Document 2 (Li Hongkui, Li Xinping, Wang Huiqin and Yue Xiaopeng, Preliminary Research on the Application of Gypsum Microfibers in Paper Reinforcement, China Paper, 2005 (2): 23-25), Document 3 (Liu Yanyu Gang, Research on the Strengthening Effect of Gypsum Fiber on Paper, China Paper, 2009 (18): 63-65), Document 4 (Liao Xialin, Qian Xue Renhe Beihai, Dissolution Inhibition Modification of Gypsum Whiskers and Its Application in Papermaking, Paper Science and Technology, 2009 (6): 82-86) reported the research of calcium sulfate whiskers used in papermaking filling, and also confirmed that In addition to the problems of low retention rate and high white water load in the direct filling of calcium sulfate whiskers, the report also tried to improve the retention of calcium sulfate whiskers by modifying chitosan and increasing the dosage of retention aids, but the results were not satisfactory. Ideal; and the modification process is complex and expensive, and cannot be applied to large-scale industrial paper production

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0029] In a volume of 10m 3Add 8.5 tons of paper-making white water into the stainless steel container with stirring, and slowly add 1.5 tons of white water extracted from the production process of wet acid hydrolysis phosphate rock at a stirring speed of 500 rpm. , the average length is 80μm, the average width is 5μm, and the crystal form is needle-shaped calcium sulfate dihydrate whisker raw material, which is prepared into a suspension with a concentration of 15%; add 0.5% (to the absolute dry whisker weight) of poly Sodium acrylate dissolves the inhibitor, control the stirring speed at 500 rpm, the temperature at 20-25°C, and the time for 15-20min; after that, adjust the pH value of the suspension to 8.0-9.0 to obtain solubility ≤ 1.8g / l, whiteness ≥88%ISO, wear ≤5mg, refractive index ≥1.5, calcium sulfate whisker paper filler with stable performance, spare. Mix poplar APMP pulp, CTMP pulp and chemical softwood pulp with a ratio of 75%: 10%: 15% after moderate beating, an...

Embodiment 2

[0031] In a volume of 10m 3 Add 8.0 tons of clean water into the stainless steel container with stirring, and slowly add 2.0 tons of water extracted from phosphogypsum waste residue at a stirring speed of 800 rpm, with a purity of ≥95%, a whiteness of ≥90% ISO, and an average length of 50 μm. The average width is 2 μm, and the crystal form is needle-like calcium sulfate dihydrate whiskers, which are prepared into a suspension with a concentration of 20%; add 1% sodium citrate dissolution inhibitor (to the absolute dry whisker weight) under stirring, Control the stirring speed at 800 rpm, the treatment temperature at 25-30°C, and the treatment time for 20-30 minutes; after that, adjust the pH value of the suspension to 8.0-9.0 to obtain solubility ≤ 1.8g / l, whiteness ≥ 90%ISO , wear ≤ 5mg, refractive index ≥ 1.5, calcium sulfate whisker paper filler with stable performance, spare. The NBKP pulp, DIP pulp and APMP pulp that have been moderately beaten are mixed according to the...

Embodiment 3

[0033] In a volume of 10m 3 Add 8.5 tons of paper-making white water into the stainless steel container with stirring, and slowly add 1.5 tons of white water extracted from desulfurized gypsum at a stirring speed of 500 rpm, with a purity of ≥95%, and a whiteness of ≥92%ISO; the average length is 20 μm, Calcium sulfate dihydrate whiskers with an average width of 2 μm and a spindle-shaped crystal form, prepared as a suspension with a concentration of 15%; add 1.5% (to the weight of absolute dry whiskers) sodium tripolyphosphate dissolution inhibitor under stirring , control the stirring speed at 500 rpm, the treatment temperature at 30-35°C, and the treatment time at 30-45min; after that, adjust the pH value of the suspension at 8.0-8.5 to obtain solubility ≤ 1.8g / l, whiteness ≥ 92% ISO, wear ≤5mg, refractive index ≥1.5, calcium sulfate whisker paper filler with stable performance, ready for use. Mix moderately beaten NBKP pulp and LBKP pulp at a ratio of 20%:80%, add 250kg / to...

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Abstract

The present invention discloses a modified calcium sulfate crystal whisker papermaking filler, a preparation method and applications thereof, wherein a modified calcium sulfate crystal whisker papermaking filler is prepared, and then the modified calcium sulfate crystal whisker papermaking filler is applied in papermaking industry. The application of the modified calcium sulfate crystal whisker papermaking filler in the papermaking industry comprises: 1) selection a papermaking slurry, (2) use of the modified calcium sulfate crystal whisker papermaking filler and related auxiliary materials, 3) papermaking, and 4) white water circulation. According to the present invention, the calcium sulfate crystal whisker raw material source is wide, conditions are wide, and solid waste pollution can be effectively solved; the modified calcium sulfate crystal whisker product has characteristics of high whiteness, low abrasion, effectively-controlled solubility, high papermaking retain rate, and low white water load, the problem of pipe scale is eliminated, and the product can completely replace calcium carbonate, kaolin, talc powder, and other papermaking fillers, and partial plant fiber raw materials; and the method has characteristics of low equipment investment, simple modification process, strong operability and low cost, and is applicable for large scale production.

Description

technical field [0001] The invention relates to a modified calcium sulfate whisker filler for papermaking, a preparation method and application thereof, and belongs to the technical field of papermaking. Background technique [0002] In the production of paper industry, in order to reduce the amount of plant fiber and paper production cost, and improve the performance of paper sheets, a certain proportion of white mineral fillers are usually added to the pulp, mainly including natural mineral raw materials such as calcium carbonate, china clay, and talcum powder. Using these non-renewable calcium carbonate, china clay, talcum powder and other minerals for papermaking filling will not only consume a large amount of natural mineral resources, but also bring serious damage to the vegetation and natural environment in the mining area. Calcium sulfate whisker (also known as gypsum whisker, gypsum fiber) is a by-product extracted from desulfurization gypsum, phosphogypsum, metal s...

Claims

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Application Information

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IPC IPC(8): D21H17/69C30B29/22C30B29/62
Inventor 王玉珑刘艳新覃盛涛
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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