Unlock instant, AI-driven research and patent intelligence for your innovation.

Hydrophobic core-shell silica particle, hollow silica particle, and manufacturing methods thereof

A technology of silica and manufacturing method, applied in the directions of silica, silica, fibrous fillers, etc., can solve the problems of gelation, whitening, and inability to hydrophobicize silica particles

Inactive Publication Date: 2015-07-15
ADEKA CORP
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, even for silica fine particles with a reduced specific gravity and high stability, conventional methods for modifying the surface of the fine particles cannot sufficiently hydrophobize the silica fine particles, and there is a problem that it cannot be added to non-silicon dioxide at a high concentration. Problems in water-soluble media, and there is a problem of turbidity, whitening or gelation in the added system

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Hydrophobic core-shell silica particle, hollow silica particle, and manufacturing methods thereof
  • Hydrophobic core-shell silica particle, hollow silica particle, and manufacturing methods thereof
  • Hydrophobic core-shell silica particle, hollow silica particle, and manufacturing methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086]

[0087] (production of nucleus)

[0088] In a 1000ml four-neck flask equipped with a thermometer, a nitrogen introduction tube and a stirrer, add 50g of styrene monomer, 500g of distilled water, 4g of dodecyltrimethylammonium chloride as an emulsifier, and decyl trimethylammonium chloride as a chain transfer agent. 2.5 g of mercaptan was replaced with nitrogen, and the temperature was raised to 70° C. while stirring. After heating up, 0.3 g of water-soluble azo polymerization initiator V-50 (manufactured by Wako Pure Chemical Industries, Ltd.) was added as an initiator, and reacted at 70° C. for 3 hours to obtain a milky white liquid polystyrene emulsion (core ).

[0089] (shell formation)

[0090] Into a 2000 ml 4-necked flask equipped with a thermometer, a nitrogen introduction tube, and a stirrer, 111.3 g of the obtained polystyrene emulsion (10 g of polystyrene content) was added, and 876 g of distilled water was added thereto to perform nitrogen substitution. ...

Embodiment 2～17

[0091]

[0092] The same method as that of the compound of Example 1 was used to produce the core, and after coating the core with the same amount of (A) component as in Example 1, the ratios described in Table 1 and Table 2 below were used. , in the order of forming the silane compound of the (B) component and the silane compound of the (C) component, the shell layer is formed by the same method as the compound of Example 1, and the compounds of Examples 2-16 and Comparative Examples 1-11 are obtained. Core-shell silica particles. In addition, in Example 17, the silane compound used to form the (A) component was changed from 12.67 g of tetramethoxysilane to 17.33 g of tetraethoxysilane (in terms of SiO 2 5 g), other core-shell silica particles were produced in the same manner as in Example 1, and Comparative Example 11 was core-shell silica particles coated only with component (A). In Table 1 and Table 2, the respective ratios (molar ratios of silicon elements) of (A) to (...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
refractive indexaaaaaaaaaa
Login to View More

Abstract

The present invention provides a hydrophobic core-shell silica particle which is added into a water-insoluble medium such as an organic medium or resin and does not cause opacity and whitening, etc. in a system obtained through adding the hydrophobic core-shell silica particles into the water-insoluble medium or prevent gelation in the added system, a hollow silica particle and manufacturing methods thereof. The core-shell silica particle is provided with a shell layer and a core which comprises a rein that is obtained through emulsion polymerization. The shell layer comprises the following components: a component (A) which is silicon dioxide that is represented by a constitution formula SiO2; a component (B) which is modified silicon oxide that is represented by a constitution formula of general formula (2) or a constitution formula of general formula (1) and general formula (2); and a component (C) which is modified silicon oxide that is represented by a constitution formula of general formula (3). In the general formula (1), R represents an alkyl which has a total carbon atom number of 1-24 and is substituted by a random group selected from amino group, sulfhydryl, (methyl)acrylic group and epoxy group; or a halogenated alkyl with 1-24 carbon atoms. In the general formula (2), R' represents an alkyl which has a total carbon atom number of 1-24 and is represented by a random group selected from amino group, sulfhydryl, (methyl)acrylic group and epoxy group; or a halogenated alkyl with 1-24 carbon atoms. In the general formula (3), R'' represents an alkyl which has a total carbon atom number of 1-24 and is substituted by a random group selected from amino group, sulfhydryl, (methyl)acrylic group and epoxy group; or a halogenated alkyl with 1-24 carbon atoms. The general formulae (1), (2) and (3) are as follows: RSiO3 / 2 (1), R'2SiO (2), R'' 3SiO1 / 2.

Description

technical field [0001] The present invention relates to core-shell silica particles that can be added to a water-insoluble medium such as an organic solvent or a resin at a high concentration, and the system after adding to the water-insoluble medium does not cause turbidity, whitening (whitening), etc., Hollow silica particles and their method of manufacture. Background technique [0002] Silica microparticles represented by colloidal silica are used in various fields such as electronic materials, building materials, paper industry, coatings, and food. Such silica microparticles are added to oils, organic solvents, or resins. There are also many cases. When water-soluble silica fine particles are added to such a water-insoluble medium, generally, problems such as aggregation or separation occur and cannot be used. Therefore, by substituting the silanol group (hydroxyl group) on the surface of the silica microparticles with a hydrophobic group such as an alkyl group, the s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12
CPCC01B33/18C01P2004/34C01P2006/20C08K3/36C08K7/26C09C1/28
Inventor 绫洋一本间刚本间正敏
Owner ADEKA CORP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com