Preparation Research And Its Application Of Petal Shaped Calcium Carbonate

Paper industry is a is closely related to national economic development and social civilization construction of the important industries.Calcium carbonate is as one of the important packing of paper-making industry which the crystal morphology and the size of the particle size have a great influence on its performance and application,and also it is an important component of the cigarette paper quality and properties.This paper uses the principle of membrane dispersion technology,self-makes membrane dispersion carbonization reactor,takes morphology and particle size of calcium carbonate and paper making industry standard HG/T2226-2010 as the main indicators,studies the process factors in the process of calcium carbonate production,thus infers to the process conditions of production upscale cigarette paper special calcium carbonate——petal shaped calcium carbonate.This paper uses starch/sodium stearate to modify the calcium carbonate under the condition of the preparation of the petal shaped calcium carbonate product,and then takes it as fillers making cigarette paper manufacture paper with pulp become feasible.The main contents of this paper are as follows:This paper uses the principle of membrane dispersion technology,self-makes membrane dispersion carbonization reactor,constructs carbonation reaction membrane dispersion working platform,takes the content of calcium carbonate,sedimentation volume,whiteness as the main indicators,studies the maneuverability of the preparation of light calcium carbonate with self-made membrane dispersion carbonization reactor.The results shows that carbonation reaction working platform can be used to produce light calcium carbonate.The sedimentation volume and whiteness of the light calcium carbonate prepared under the optimal conditions are respectively 4.0mL and 95.3,which conform to the requirements of superior product of HG/T2226-2010 industry standards in paper-making industry.This paper uses the aforementioned carbonation reaction membrane dispersion working platform,adopts a single variable method,takes morphology and particle size of calcium carbonate as the main indicators,investigates the main process parameters of calcium carbonate making,and gets the optimum process conditions of preparation of petal shaped calcium carbonate:the carbonation reaction system temperature is 60℃,calcium hydroxide concentration is 6%,carbon dioxide and nitrogen gas mixture of the velocity is 200 and 400(ml min-1),phosphoric acid content is 2%,and phosphoric acid added time is starting after 5 min.It is necessary to design L16(45)orthogonal experiments to explore the interaction between various factors in prepared process of petal shaped calcium carbonate,and gets optimum process conditions for preparation of petal shaped calcium carbonate sphere as follows:phosphoric acid content is 2%,the carbonation reaction system temperature is 60℃,calcium hydroxide concentration is 8%,the gas flow of carbon dioxide and nitrogen gas mixture is 100 and 200ml min-1,and phosphoric acid added time is starting after 5 min.The average particle size of D50 of prepared calcium carbonate is 3.25μm,the size of the D90 is 4.08μm,and the shape is petal shaped calcium carbonate,and also the calcium carbonate content,sedimentation volume,white degree,pH value,hydrochloric acid insolubles,free alkali content,volatile content at 105℃ and et al indicators of the above-mentioned calcium carbonate have reached the requirements of paper making with high-class products of industry standard of HG/T 2226-2010.This paper takes cigarette paper pulp as raw material,and uses respectively starch and starch/sodium stearate to modify calcium carbonate as filler for paper making.Based on the prepared paper tensile strength,tear index and burst index as the main examine indexes,this paper selects appropriate modifier.Study shows that the physical indexes such as the paper tensile index,tear index and burst index of the paper with calcium carbonate modified by starch/sodium stearate are higher than the unmodified calcium carbonate and using starch modified calcium carbonate,and air permeability et.al physical indexes of the aforementioned cigarette paper conforms to the requirements of the B standard of HG/T 4204-2011.