Method for producing hydrophilized microparticles

A technology of hydrophilization and microparticles, applied in the field of preparation of hydrophilic microparticles, can solve the problem of no research on the coloring of polymer particles, and achieve the effect of inhibiting the discoloration and high hydrophilization of vinyl polymer microparticles

Inactive Publication Date: 2014-11-05
TOYO TANSO KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in Patent Document 2, the coloring of polymer particles is not studied at all.

Method used

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  • Method for producing hydrophilized microparticles

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Experimental program
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Effect test

preparation example Construction

[0013] In the production method of the present invention, a mixed gas containing fluorine gas, a gas containing an oxygen atom-containing compound, and an inert gas is brought into contact with the substrate particles to hydrophilize the surface of the substrate particles. It is considered that by this treatment, hydrogen bonded to carbon is replaced by oxygen and fluorine to form -C(F)=O, after which some or all of them are converted into carboxyl groups. Therefore, a plurality of -C(F)=O and / or carboxyl groups are generated near the surface of the hydrophilized microparticles, and the hydrophilicity is significantly improved. In addition, while generating the -C(F)=O or carboxyl group, a reaction in which a part of the C-H bond in the particle skeleton is converted into a C-F bond also proceeds. In addition, the presence of these functional groups or bonds can be confirmed by an X-ray photoelectron analysis device (ESCA) or the like.

[0014] 1. Mixed gas

[0015] In the p...

Embodiment

[0092] The following examples are given to describe the present invention more specifically. However, the present invention is not limited to the following examples, and can be appropriately modified and implemented within the scope of the above-mentioned and following gist, and these are also included in the present invention. within the technical range. In addition, in the following, unless otherwise specified, "part" means "mass part", and "%" means "mass %". Various measurement and evaluation methods were performed as follows.

[0093] 1. Evaluation method

[0094] 1-1. Average particle size

[0095] The particle diameters of 30,000 particles were measured using a precision particle size distribution measuring device (trade name: "Colter Malchizer III", manufactured by Beckman Coulter Co., Ltd.), and the average particle diameter and standard deviation based on the number of particles were determined. The coefficient of variation (CV value) of the particle diameter was ...

preparation example 1

[0118] 120 parts of the above-obtained substrate particle No. 1 were charged into a chamber-type processing apparatus with a capacity of 500 L. The particle layer has a thickness of 0.5 mm. After the chamber is decompressed to 1Pa, the mixed gas is introduced to make the fluorine (F 2 ) gas / oxygen (O 2 ) gas / nitrogen (N 2 ) gas = 1.33kPa (10torr) / 3.99kPa (30torr) / 74.48kPa (560torr). Thereafter, after processing at 40° C. for 60 minutes, the inside of the chamber was replaced with nitrogen and returned to atmospheric pressure.

[0119] Then, 120 parts of the obtained mixed gas-treated particles were dispersed in a 1% by mass aqueous sodium hydroxide solution (particle concentration: 6.7%), and alkali treatment was performed at 80° C. for 3 hours while stirring. After the particles were filtered, they were dispersed in ion-exchanged water at 80° C. (particle concentration: 6.7% by mass), and washed at the same temperature for 3 hours. After cooling to room temperature, the ...

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Abstract

Provided is a method for producing hydrophilized microparticles, wherein the discoloration of vinyl polymer microparticles can be controlled even if the fluorine gas concentration in the mixed gas used for the hydrophilization process is increased. This method for producing hydrophilized microparticles, which produces hydrophilized microparticles by performing a treatment that brings the substrate particles into contact with a mixed gas containing fluorine gas, the gas of an oxygen atom-containing compound, and an inert gas to hydrophilize the surface of the substrate particles, is characterized in that: the substrate particles are vinyl polymer microparticles with a number-based mean particle size of 1000 µm or less; the volume ratio between the fluorine gas and the oxygen atom-containing compound gas in the mixed gas (oxygen atom-containing compound gas / fluorine gas) is less than 6; and the concentration of fluorine gas in the mixed gas is 0.9 volume% or more.

Description

technical field [0001] The present invention relates to a method for preparing hydrophilized fine particles by treating the surface of substrate particles with hydrophilicity. Background technique [0002] Vinyl (co)polymer microparticles are usually produced by radical polymerization using (meth)acrylic monomers or vinyl monomer compositions such as styrene as polymerization raw materials. The mechanical strength and heat resistance of the particles can be controlled by selecting the type and combination of vinyl monomers used, or by adding inorganic components or non-polymerizable components to the vinyl monomer composition. , optical properties, surface shape, porosity and other physical properties. In addition, as the polymerization method, suspension polymerization, emulsion polymerization, seed polymerization, dispersion polymerization, etc. can be appropriately selected, and ethylene-based polymer fine particles with controlled particle size and particle size distrib...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/12
CPCC08J2333/06C08J2383/04C08J3/12C08F8/00C08J7/12
Inventor 竹林仁初代善夫高田顺司松本和明佐佐木令晋
Owner TOYO TANSO KK
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