4results about How to "High whiteness value" patented technology

This invention discloses a method for preparing cubic nano-calcium carbonate based on monosaccharide regulation. Using monosaccharides as crystal guiding agents, the resulting cubic nano-calcium carbonate exhibits a cubic structure with an average particle size of 81-115 nm. The monosaccharide is either glucose or fructose. The preparation method includes the following steps: 1. Preparation of calcium oxide; 2. Preparation of monosaccharide-nano-calcium carbonate. The amount of monosaccharide added is 0.8-1.2 wt.% of the calcium oxide mass; the calcium oxide yield is 65-75%. The resulting nano-calcium carbonate has a whiteness value of 90.6-97.3 wb and an oil absorption value of 65.3-89.6 g DOP / 100 g CaCO3.

The invention belongs to the technical field of plastic processing, and particularly relates to a flame-retardant smoke-suppressing PVC pipe and a preparation method thereof. According to the invention, the seaweed mud is innovatively used as a filler of the PVC pipe and is ingeniously blended into a composite system of dialkyl phosphate and polyol, and the flame-retardant and smoke-suppressing effects, mechanical properties and whiteness value of the PVC pipe are remarkably improved by utilizing a synergistic effect. Wherein a unique porous microstructure of the seaweed mud and dialkyl phosphate serving as an intumescent flame-retardant auxiliary agent generate a strong synergistic enhancement effect through a pore effect, so that not only is the use amount of a flame retardant reduced, but also the mechanical property of the PVC pipe is improved; the polyhydric alcohol is used as a plasticizing and cross-linking auxiliary agent, is subjected to esterification reaction with the dialkyl phosphate to strengthen the overall flame-retardant and smoke-suppression effect, and is cooperated with the seaweed mud to enhance the whiteness of the PVC pipe. The PVC pipe which is flame-retardant, smoke-suppressing, excellent in mechanical property, high in whiteness value and low in cost is successfully prepared, and the application field of the PVC pipe is widened.

The invention provides a method for preparing high-white and high-activated ground calcium carbonate with a composite functional additive, comprising the following steps: mixing DSD acid, water and a saturated Na2CO3 solution and stirring until the solution is clarified, dripping the mixture into a mixture of cyanuric chloride and ice water, stirring in an ice bath and controlling the temperature at 3-5°C for reaction for 1.5h; then adding 3-aminopropyltrimethoxysilane and 4-aminobenzenesulfonic acid, adjusting the pH to 8 with a saturated Na2CO3 solution, controlling the temperature at 40-45°C, and reacting for 3.5h; then adding diethylaminoethyl methacrylate Ester, maintain pH=9 with saturated Na2CO3 solution, heat to 85-90℃, stir to react for 6h, cool to room temperature; finally add sodium dodecylbenzene sulfonate and water, heat and stir evenly to obtain composite functional additive; add 20Kg of heavy calcium carbonate powder with 600-1250 mesh and whiteness (CIE) of 92-94, stir, filter and dry to obtain high-white and high-activated heavy calcium carbonate, whose oil absorption value is 12-15g / 100g, and whiteness value (CIE) is increased by 3.5-4.0. The patented technology of the present invention can significantly improve the whiteness value of calcium carbonate powder and effectively reduce the oil absorption value of heavy calcium carbonate powder, achieving the dual effects of whitening and surface activation.

The invention belongs to the technical field of mineral separation, and particularly relates to a potassium feldspar ore impurity removal and quality improvement method. The potassium feldspar ore is subjected to two-stage high-intensity magnetic separation impurity removal, and magnetic separation concentrate is obtained; after the magnetic concentrate is mixed to be neutral, a roughing agent is added for roughing flotation, and roughing concentrate is obtained; and after the roughing concentrate is subjected to size mixing to be neutral, a concentration reagent is added for concentration flotation, concentration concentrate is obtained, and the potassium feldspar ore impurity removing and quality improving technology is completed. According to the method, a magnetic-flotation combined beneficiation method is utilized, metal ions serve as one of flotation reagent components, dark iron-rich impurity minerals can be effectively removed, the number of harmful elements such as iron, calcium and magnesium can be reduced, the problem that black spots or rough surfaces appear in the firing process of the potassium feldspar can be avoided, and the quality of the potassium feldspar is improved. The whiteness value and the industrial utilization value of the low-quality potassium feldspar are improved.