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Method and device for post-treatment of polymer emulsions

A technology of polymer emulsion and polymer, which is applied in the field of polymer chemistry, can solve the problems of irregular shape of polymer resin powder particles, inability to remove impurities efficiently, and influence on product appearance, and achieve simple and practical equipment, good appearance, and appearance. good form effect

Active Publication Date: 2016-11-02
江西岳峰集团高分子材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The coagulation process of this method requires a large amount of desalted water, coagulants and dispersants, etc., and the generated wastewater must be treated many times before it can be discharged, resulting in high production costs.
Moreover, the polymer resin powder formed by this method has irregular particle shape, poor fluidity, wide particle size distribution and small bulk density, and has fatal weaknesses such as low product yield.
However, other existing technologies, such as spray drying, granulation washing and other methods, cannot efficiently remove the impurities remaining in the polymerization process or introduce new impurities in the post-processing process, which will affect the appearance of the product to varying degrees.

Method used

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  • Method and device for post-treatment of polymer emulsions
  • Method and device for post-treatment of polymer emulsions
  • Method and device for post-treatment of polymer emulsions

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Embodiment 1

[0037] Please refer to figure 1 , this embodiment provides an equipment for post-treatment of polymer emulsion, which includes a prilling tower 110 and a neutralization tank 120 .

[0038] Such as figure 1 As shown, the prilling tower 110 is a hollow cylindrical structure as a whole, including a drying chamber (not shown) for drying the polymer emulsion. The nozzle (not shown in the figure), the polymer emulsion passing through the nozzle will be dispersed into fine droplets and suspended in the drying chamber. refer to figure 2 As shown, a plurality of flushing nozzle groups 112 arranged along the length direction of the prilling tower 110 are arranged on the tower wall surrounding the drying chamber, and the plurality of flushing nozzle groups 112 are arranged at equal intervals. It should be noted that, in other preferred embodiments of the present invention, the distances between the plurality of flushing nozzle groups 112 may not be completely equal, and may also be s...

Embodiment 2

[0046] The present embodiment adopts the equipment provided in the first embodiment to propose a kind of MBS resin, and its aftertreatment method is as follows:

[0047] The MBS emulsion with a solid content of 35-42% prepared by emulsion polymerization is selected. The MBS emulsion is transported to the prilling tower 110 by a delivery pump for pre-drying and granulation. The pressure of the delivery pump is set to 3.0Mpa, the inlet temperature of the prilling tower is 160°C, and the outlet temperature is 60°C. The content of the MBS powder after granulation The amount of water is 23%.

[0048] The above-mentioned MBS powder is transported from the prilling tower 110 to the pickling chamber 111 containing sulfuric acid solution for acidification and washing, and water vapor is kept flushing in the prilling tower 110 and the pickling chamber 111. Wherein, the pH of the sulfuric acid aqueous solution is 3.5, and the temperature is 60°C. The acidified and washed MBS powder is ...

Embodiment 3

[0050] This embodiment proposes a kind of MBS resin, its post-treatment method is basically the same as that of the first embodiment, the difference is: the water content of the MBS powder after granulation is 20%; the acidic solution selected is a sulfuric acid solution with pH=2.0 , the temperature is 65°C; the selected alkaline solution is sodium hydroxide solution with pH=8.2; the neutralized suspension pH=6.5~6.8, the temperature is between 45~50°C; the water content of the crude MBS resin is 35%.

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Abstract

A method for post-treatment of polymer emulsions belongs to the field of high-molecular chemistry and includes the steps of acidifying polymer powder in an acidic solution, and neutralizing the polymer powder in an alkaline solution to prepare polymer resin, wherein the polymer powder is prepared by pre-drying and granulating a polymer emulsion. Through the acid pickling, residual various small-molecular impurities in the polymer powder are removed, so that the prepared granules have excellent appearance. The residual acid then is neutralized so that the polymer resin can be stored for a long time without color change. The method is high in yield, is high in product qualified ratio, and has simple processes and low production cost. The invention also provides a device for the post-treatment of the polymer emulsions, wherein the device is provided with, continuously, a granulation column and a neutralization tank, wherein a drying chamber and an acid-pickling chamber are arranged in the granulation column. The method and the device ensure continuous operation of the steps of granulation, acidification and neutralization, avoid product loss due to replacement of equipment and also increase yield.

Description

technical field [0001] The invention relates to the field of polymer chemistry, in particular to a method and equipment for post-treatment of polymer emulsions. Background technique [0002] Polymer resin emulsion generally refers to a polymer emulsion obtained by uniformly dispersing oil-soluble monomers in an aqueous medium through an emulsifier, and initiating emulsion polymerization by an initiator. Finally, post-processing is required to obtain polymer powder or fine particle products. In the prior art, for the polymer emulsion obtained by emulsion polymerization, the coagulation-centrifugation-drying post-treatment method is mainly used to prepare polymer resin products. The coagulation process of this method requires a large amount of desalted water, coagulants, dispersants, etc., and the generated wastewater can only be discharged after multiple treatments, resulting in high production costs. Moreover, the particle shape of the polymer resin powder formed by this m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F6/16C08F279/02C08F220/10C08F279/04C08L51/04C08L33/04C08L55/02
CPCC08F6/16C08L51/04C08L33/04C08L55/02
Inventor 田岳南
Owner 江西岳峰集团高分子材料有限公司
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