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 simple process, avoiding foaming and good modification effect

Active Publication Date: 2016-03-30
贵州开磷遵义碱厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, there is no patent application for using phosphogypsum as a polyvinyl chloride resin filler

Method used

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Experimental program
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Embodiment

[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. In the method, the phosphogypsum is modified first, and a coupling agent is added when it is ground to obtain a product that can be used as a polyvinyl chloride resin filler. Specifically Method: (1) sieving, (2) calcining, (3) grinding and adding coupling agent, (4) mixing to obtain aluminate modified phosphogypsum filler. Advantages of this method ： ①Phosphogypsum is sieved and calcined to remove organic impurities and crystal water, improve whiteness, and then grind to control the particle size to meet the requirements of PVC fillers, with low cost; ②Uniform modification and good effect; no additional water It can avoid foaming during PVC processing; ③The process is simple and low cost, which can accelerate the plasticization of phosphogypsum in PVC resin, and has excellent processing rheological properties and is easy to shape. It is suitable for strengthening and toughening polymer materials, not only for PVC resin, but also as filler for PE, PP, PS and other materials.

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 reaches...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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