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Hollow polymer particle, colored hollow polymer particle and their production methods

A polymer particle, hollow technology, used in transportation and packaging, thin material handling, etc., can solve problems such as complex operations, water droplet size disruption, particle size inconsistency, etc., to achieve the effect of inhibiting heat conduction, light weight and good reproducibility

Inactive Publication Date: 2009-04-15
DIC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Complicated work is required in all processes
In addition, in this method, since the free radical polymerization reaction is carried out at the water / oil interface of the W / O type inverse emulsion, even if the size of the water droplets in the early stage of polymerization and the initial stage are uniform, the size of the water droplets in the whole polymerization process is generally The particle size and film thickness of the hollow particles cannot be controlled because they are disturbed. As a result, the particles are large particles with a diameter of 1 to 3 μm that are inconsistent in particle size, and only particles with thick shells with a shell thickness of 100 nm can be obtained.
In addition, in this method, free radical polymerization at the water / oil interface is completely impossible without a heat-responsive water-soluble polymer called the lower critical solution temperature (LCST), which cannot be achieved in a wide range carried out in the monomer
In addition, since it is a W / O type inverse emulsion, a large amount of organic solvents such as toluene have to be discharged, so the environmental load is extremely large

Method used

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  • Hollow polymer particle, colored hollow polymer particle and their production methods
  • Hollow polymer particle, colored hollow polymer particle and their production methods
  • Hollow polymer particle, colored hollow polymer particle and their production methods

Examples

Experimental program
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Effect test

preparation example Construction

[0077] The preparation method of the present invention will be described in detail below.

[0078] The preparation method of the present invention is a method for preparing hollow polymer particles in a single tank, that is, without separation operation in the same reactor, and is characterized in that the free radical polymerizable The water-soluble monomer (A) and the radical-polymerizable water-insoluble monomer (B) are subjected to pseudo-emulsion radical polymerization.

[0079] As the aqueous medium used in the aforementioned pseudo-emulsion polymerization, in addition to using water alone, lower alcohols such as methanol, ethanol, isopropanol, ethylene glycol, propylene glycol, butylene glycol, diethylene glycol, triethylene glycol, etc. Polyols such as acetone and methyl ethyl ketone, ethers such as tetrahydrofuran alone or mixed in water.

[0080] When using a mixed solvent, as its mixing ratio, as long as the water-soluble polymerization initiator described later an...

Embodiment 1

[0108] [Synthesis of hollow polymer particles including poly(NIPAM-co-GMA), a copolymer of N-isopropylacrylamide (NIPAM) and glycidyl methacrylate (GMA)]

[0109] Add 8.52 g of glycidyl methacrylate (manufactured by Wako Pure Chemical Industries, Ltd., hereinafter referred to as NIPAM) in 200 ml of an aqueous solution in which 1.4 g of N-isopropylacrylamide (manufactured by Xingren Co., Ltd., hereinafter referred to as NIPAM) was dissolved. GMA), heated to 70 °C while stirring under nitrogen atmosphere. 20 ml of an aqueous solution in which 0.1 g of a water-soluble polymerization initiator potassium persulfate (KPS, manufactured by Wako Pure Chemical Industries, Ltd.) was dissolved was added to this mixture (GMA / NIPAM=4.8 mol / mol). A dispersion of particles was obtained by stirring at this temperature for 1 hour. The dispersion was washed and purified by centrifugation. Through dynamic light scattering, SEM and 1 Identification of the purified particles was performed by H-N...

Embodiment 2～26

[0111] [Synthesis of hollow polymer particles including copolymers of various water-soluble monomers and water-insoluble monomers]

[0112] Except that the amount of the water-soluble monomer (A) used in Example 1, the water-insoluble monomer (B), the water-soluble polymerization initiator and the aqueous solution are changed to each value in Table 1, obtain in the same way as Example 1 Hollow polymer particles. The property values ​​of the obtained granules are summarized in Table 2. In addition, Example 6 is an example using sodium lauryl sulfate as a surfactant, and it was used after adding a predetermined amount to an aqueous solution of NIPAM and stirring it uniformly.

[0113] [Table 1]

[0114] Table 1 embodiment feed list

[0115]

[0116] Table 1 Note:

[0117] MBAM: N,N'-Methylenebisacrylamide

[0118] DMAA: N,N-dimethylacrylamide

[0119] ACMO: Acryloylmorpholine

[0120] AA: Acrylic

[0121] MAP-TMACl: 3-(methacrylamido)propyltrimethylammonium chloride ...

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Abstract

The hollow polymer particles of the present invention comprise a shell wall having for a main component thereof a copolymer obtained by polymerizing a monomer group (I) including a radical polymerizable water-soluble monomer (A) and a radical polymerizable water-insoluble monomer (B), and have a thickness of the shell wall of 5 to 80 nm. In addition, in the hollow polymer particle production process of the present invention, a monomer group (I) including a radical polymerizable water-soluble monomer (A) and a radical polymerizable water-insoluble monomer (B) is radical- polymerized using a polymerization initiator in an aqueous medium.

Description

technical field [0001] The present invention relates to hollow polymer particles, and more particularly, the present invention relates to hollow polymer particles having thin shell walls and high porosity, colored hollow polymer particles and their convenient preparation methods. Background technique [0002] Hollow polymer particles are widely utilized as microcapsules containing various functional substances inside the particles. In addition, it is known that it is also useful in the field of coatings / coatings for paper, fibers, leather, etc., for imparting gloss, opacity, whiteness, etc. Light-scattering agents and light-scattering aids with high performance. Also, since the inside is hollow, it can be expected to have a large volume, light weight, and heat insulation effect. [0003] As methods for producing such hollow polymer particles, several methods have been proposed. For example, there has been proposed a method of obtaining hollow polymer particles by adding a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/00
CPCC08F222/385C08F220/56C08F230/08C08F220/22C08F220/32Y10T428/2985Y10T428/2987C08F220/325C08F230/085C08F265/10C08F265/06C08F220/00
Inventor 深泽宪正金仁华
Owner DIC CORP
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