Cellulosic product and process for its production
a technology of cellulosic products and products, applied in the directions of non-fibrous pulp addition, transportation and packaging, paper-making, etc., can solve the problems of increasing the presence of disturbing and detrimental substances in the suspension, interfering with the pulp and paper making process in various ways, and requiring the cleaning of the paper machin
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example 1
[0070] An Al—Mg clay having the 3R2 stacking (CC-14, Akzo Nobel Catalyst B.V.) was compared to a commercial talc (Finntalc PO5 from Omya) in terms of pitch adsorption. The method of evaluation of pitch adsorption of mineral powder was a variation of a procedure outlined by D. A. Hughes in Tappi (July 1977, vol. 60, No. 7, p. 144-146). Firstly, samples of synthetic pitch were prepared by adding potassium hydroxide (1 M) to a mixture of 0.65 g of gum rosin and 0.35 g of oleic acid until saponification resulted. Denatured ethanol was subsequently added to dissolve the synthetic pitch.
[0071] Pitch adsorption test procedure: 35 ml of distilled water was first added to a glass centrifuge tube followed by the addition of 1 ml of the synthetic pitch solution and 10 ml of clay having the 3R2 stacking (2.5% dry content). The pH of the synthetic pitch slurry was adjusted to 6.5 with sulphuric acid. The mixture was subsequently stirred for 2 minutes and centrifuged for 20 minutes at 4500 rpm. ...
example 2
[0073] In this example, the pitch adsorption characteristics of an Al—Mg cationic clay having the 3R1, stacking, (CC-8, Süd Chemie) was compared to an Al—Mg cationic clay having the 3R2 stacking (CC-17, Akzo Nobel Catalyst B.V.).
[0074] Two mixtures of synthetic pitch were prepared, one containing oleic acid and gum rosin (Pitch No. 1)—of example 1, and a further synthetic pitch mixture containing abietic acid. The abietic acid containing pitch (Pitch No. 2) was prepared by mixing 1 g of abietic acid and 1M potassium hydroxide until saponification occurred. Denaturated ethanol (250 ml) was added to dissolve the synthetic pitch. The same pitch adsorption test procedure as outlined in Example 1 was used. The results are summarized in Tables 1 and 2.
TABLE 2Pitch Addition(Pitch No. 1)Pitch Adsorption [mg / g]Test No.[mg / g]CC-8 (3R1)CC-17 (3R2)1000285.47.13169.6414.143221.52954834.441
[0075]
TABLE 3Pitch Addition(Pitch No. 2)Pitch Adsorption [mg / g]Test No.[mg / g]CC-8 (3R1)CC-17 (3R2)1000284...
example 3
[0077] The adoption of stickies (hot-melts) of an Al—Mg cationic clay having the 3R2 stacking (CC-14, Akzo Nobel Catalyst B.V.) was compared to talc (Finntalc P05, Omya) using the TOC Instrument (Dohrman DC190). The TOC (Total Organic Carbon) was determined by combustion at 800° C. whereby the carbon was oxidised to carbon dioxide and then analysed by means of the IR-spectroscopy method. The results are summarised in Table 4, in which ‘Stickies Addition’ refers to the amount of stickies, in mg, added per gram of adsorbent; clay or talc, and ‘Stickies Adsorption’ refers to the amount of stickies, in mg, adsorbed per gram of adsorbent; talc or clay.
TABLE 4Stickies Adsorption [mg / g]TalcCC-14TalcCC-14Stickies[0.16[0.16[0.08[0.08TestAdditionmg / ml]mg / ml]mg / ml]mg / ml]No.[mg / g]hotmelthotmelthotmelthotmelt100000221.321.52341.841.84
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