Process for producing aggregated latex particle

A coagulation gel and particle technology, which is applied in the field of preparation of coagulation latex particles, can solve the problems of latex liquid transferability deterioration, thermal stability decline, and increase in manufacturing costs, and achieve the effect of less fine powder and coarse particles and good powder characteristics

Inactive Publication Date: 2007-12-19
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Generally, when 2 parts by weight or more of high-molecular-weight polyanions are added to the polymer latex, the following problems are likely to occur: (1) the inherent quality (such as thermal stability, etc.) ) sometimes decreases, (2) the addition of a large amount of high molecular weight polyanions causes an increase in manufacturing costs, (3) due to the addition of high molecular weight polyanions, the latex viscosity usually below 10mPa.s must be adjusted to more than 200mPa.s, Preferably 1000mPa.s or more, so the latex pipetting property deteriorates, etc., so it cannot be considered as an ideal method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] To polymer latex A (100 parts by weight of polymer solid content), 1.5% by weight of sodium alginate (Algitex LL manufactured by Kimika Co., Ltd.) aqueous solution was added (the viscosity of the aqueous solution measured with a B-type viscometer was 120 mP.s), Furthermore, the solid content of sodium alginate was 0.4 parts by weight relative to 100 parts by weight of polymer solid content, and stirred and mixed for 3 minutes to obtain a mixed latex. Use one of the pressurized nozzles, a swirling cone nozzle, with a nozzle diameter of 0.6mm and a nozzle pressure of 3.7kg / cm 2, In a cylindrical device with a height of 5 m from the liquid surface at the bottom of the tower and a diameter of 60 cm, the mixed latex with a volume average droplet diameter of 200 μm is sprayed at a temperature of 25° C. At the same time, use a two-fluid nozzle to mix with air while spraying a 30% by weight calcium chloride aqueous solution with a droplet diameter of 0.1 to 10 μm so that the ca...

Embodiment 2

[0080] It implemented similarly to Example 1 except having changed the addition amount of sodium alginate into 0.01 weight part of solid content ratio with respect to 100 weight part of polymer solid content.

Embodiment 3

[0082] It implemented similarly to Example 1 except having changed the addition amount of sodium alginate into 1.8 weight part of solid content ratios with respect to 100 weight part of polymer solid content.

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PUM

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Abstract

A novel method of particle formation by which aggregated latex particles extremely reduced in the content of fine particles and coarse particles and satisfactory in powder properties including blocking resistance and powder flowability can be recovered from a polymer latex without deteriorating the original quality possessed by the polymer itself. The process for producing aggregated latex particles is characterized in that a polymer latex containing a water-soluble polymer having the property of forming a physical gel is atomized or dropped in a gas phase containing an inorganic salt and / or an acid in an aerosol state and the droplets of the polymer latex are caused to fall or come into an aqueous phase.

Description

technical field [0001] The present invention relates to a method for the preparation of coagulated latex particles. More specifically, the present invention relates to a method for producing coagulated latex particles from a polymer latex containing a water-soluble polymer compound having physical gel-forming properties. Background technique [0002] In order to recover the target polymer contained in the latex from the polymer latex obtained by the emulsion polymerization method and the suspension polymerization method, it is necessary to coagulate and granulate the latex to perform a so-called granulation operation. This granulation operation has a great influence on powder characteristics such as particle shape, particle size distribution, fine powder amount, coarse particle amount, powder fluidity and blocking resistance of recovered particles. [0003] Usually, when recovering a polymer from a polymer latex, a coagulant is put into the polymer latex at a temperature su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08F6/22
CPCC08C1/15C08J2301/00C08F6/22C08J3/122C08J2333/00C08C1/14
Inventor 植田贵志
Owner KANEKA CORP
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