Method for using phosphogypsum as polyvinyl chloride resin filler

A technology of polyvinyl chloride resin and phosphogypsum, which is applied in the field of polyvinyl chloride resin fillers to achieve the effects of avoiding foaming, excellent processing rheological properties, and good modification effect

Active Publication Date: 2013-12-11
贵州开磷遵义碱厂
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[0020] First use a 100-mesh sieve to sieve the phosphogypsum to remove some particles with a particle size larger than 100 mesh to reduce the impurity content that affects the thermal stability of the PVC resin; the phosphogypsum after screening is placed in a high-temperature electric furnace (to avoid introducing external impurities) , calcined at 450°C and held for 90 minutes to remove the crystal water in the phosphogypsum, effectively remove the organic impurities in the phosphogypsum, increase the whiteness to more than 85, and obtain anhydrous phosphogypsum; then put the anhydrous phosphogypsum into a ball mill Medium grinding, at the same time choose aluminate coupling agent, dilute with liquid paraffin as solvent, add the diluted solution into the anhydrous phosphogypsum fine powder in the ball mill in 2 to 3 times, the quality of the coupling agent used is 2% of anhydrous phosphogypsum fine powder; grind until the particle size is less than 800 mesh and discharge. Af...

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Abstract

The invention discloses a method for using phosphogypsum as a polyvinyl chloride resin filler. The method is as follows: the phosphogypsum is subjected to modified treatment; a coupling agent is added in a milling process, so as to obtain the product which can be used as the polyvinyl chloride resin filler. The method comprises following concrete processes: (1) screening; (2) calcining; (3) grinding and adding the coupling agent; and (4) mixing, so as to obtain an aluminate ester modified phosphogypsum filler. The method has the advantages that (1) organic impurities and crystal water are removed by screening and calcining the phosphogypsum; the whiteness is improved; the grain sizes of the grains are controlled in a grinding manner; the method meets the requirements of the polyvinyl chloride (PVC) filler, and is low in cost; (2) the method is even to modify, and good in effect; no externally added water enters inside; the bubbling of the PVC in a machining process is avoided; (3) the method is simple in process, low in cost, good in processing rheological property and easy to mold, and the plasticization of the phosphogypsum in the PVC resin can be accelerated. The method is suitable for reinforcing and toughening of a polymer material, not only can be applied to the PVC resin, but also can be used as fillers of the materials such as polyethylene (PE), polypropylene (PP) and polystyrene (PS).

Description

technical field [0001] The present invention relates to a copolymer of vinyl chloride, also relates to phosphogypsum, in particular, relates to a polyvinyl chloride resin filler. Background technique [0002] In plastic processing, adding powder fillers can achieve the effect of increasing and reducing costs, and can improve or enhance the physical and mechanical properties, wear resistance, thermal properties, and aging resistance of plastic products, and overcome the low temperature resistance and low temperature resistance of plastics. Disadvantages such as rigidity, easy expansion, and easy creep. Therefore, the filler has both an increasing effect and a modifying effect; some fillers are active and can also play a reinforcing role. [0003] Phosphogypsum is the solid waste of the phosphate fertilizer industry, and about 4.5-5.0t of phosphogypsum is produced for every 1t of phosphoric acid produced. The annual output of phosphogypsum waste residue in my country reache...

Claims

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Application Information

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IPC IPC(8): C08L27/06C08K9/04C08K3/30
Inventor 王稚阳梅桂李静吕丹唐兴兰赵伦东王璐雷云霄王红民宋梓廉王云亮廖志林田勇
Owner 贵州开磷遵义碱厂
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