• Title/Summary/Keyword: Dispersing agent

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Effect of Dispersing Agent for Carbon Black in Aqueous Systems (Carbon Black의 수계분산에서 계면활성제의 영향)

  • 김현성;손성민;김성빈
    • Journal of the Korean Graphic Arts Communication Society
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    • v.18 no.1
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    • pp.71-81
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    • 2000
  • The water-based ink has lately attracted considerable attention because of problems of energy and population. Carbon blacks have been widely utilized in water-based systems to provide pigmentation. One of the most important factors in the successful formulation of an aqueous system containing carbon black is the dispersion and the selection and proper utilization of the dispersing agent. This is similar to water-based ink. This paper discusses dispersion of carbon black with the factors affecting the dispersing agent requirement (DAR) and describes a laboratory method for determining it. Variables that affect the dispersion, such as structure, surface area, and oxidation level of the carbon black are examined through test data. Anionic and nonionic dispersing agents are evaluated using the DAR method. From this study, the increased surface area, the increased DAR is indicated. DAR is indicated to depend on HLB(Hydrophilic Lipophilic Balance) of dispersing agent and pH of dispersing system.

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Influence of Amine Base Dispersing Agent on Properties of Silica Filled Rubber Compounds (아민계 분산제가 실리카 고무배합물의 물성에 미치는 영향)

  • Park, Sung-Soo;Kil, Sang-Gyu;Jang, Byung-Man;Song, Ki-Chan;Kim, Su-Kyung
    • Polymer(Korea)
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    • v.25 no.4
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    • pp.503-511
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    • 2001
  • Present silica dispersing agents are based mainly on fatty acid derivatives of Zn, K and mixture of fatty acid and metallic soaps are used to increase activity. The viscosity of silica filled rubber is lowered by Zn-K soap type silica dispersing agent, thus fluidity of hydrocarbon chains and processibility is improved. Silica dispersing agent should not exert an influence on chracteristics of vulcanization. But scorch and curing time is shortened by Zn-K soap type silica dispersing agent. A newly developed silica dispersing agent, which is a nonmetal type agent, reduced the viscosity and hardness of silica compounding rubber, and the highly increased degree of dispersion of silica is caused by interaction of silica and rubber. Also it did not affect the curing characteristics and scorch stability of silica compounding rubber.

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Natural Dispersing Agent from Korean Seaweed Extract to Enhance the Safeness and UV Protection Properties of Inorganic Sunscreen Based on TiO2 Nanoparticles

  • Pestaria Sinaga;Sung-Hwan Bae
    • Korean Journal of Materials Research
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    • v.34 no.2
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    • pp.95-104
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    • 2024
  • Nanoparticles are commonly used to avoid the opaque white color of TiO2 based sunscreen. However, a dispersing agent is typically required because of the tendency of the nanoparticles (NPs) to agglomerate. Stearic acid is one kind of dispersing agent often used for sunscreen products. However, according to the MSDS data sheet on stearic acid, stearic acid is highly hazardous to aquatic life and causes irritation on human skin. To avoid this problem, in this study a safer organic dispersing agent extracted from Korean seaweed has been studied to disperse TiO2 nanoparticles, and further use as an active agent in sunscreen products. The presence of phytochemicals in seaweed extract, especially alginate, can disperse TiO2 nanoparticles and improve TiO2 dispersion properties. Results show that seaweed extract can improve the dispersion properties of TiO2 nanoparticles and sunscreen products. Reducing the agglomeration of TiO2 nanoparticles improves sunscreen properties, by making it less opaque white in color, and increasing UV protection value. It was also confirmed that adding seaweed extract into sunscreen products had no irritating effects on the human skin, making it more desirable for cosmetics application.

Effect of Polyethylene Glycol on Physicochemical Property in Dispersing Film Formulation (분산형 필름제형의 물리적 특징에 미치는 폴리에틸렌글리콜의 영향)

  • Cho, Young Ho;Lee, Jong-Hwa;Lee, Gye Won
    • KSBB Journal
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    • v.31 no.4
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    • pp.291-299
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    • 2016
  • In this study, Indomethacin, the poorly water soluble drug, was selected and prepared dispersing oral disintegrating films according to the molecular weight of polyethylene glycol (PEG) which are sort of dispersing agents. Also the molecular weight and content of PEG were evaluated effect on the degree of dispersion, physical property and dissolution when making oral dispersing film containing indomethacin to find appropriate condition and suggested guidelines of making oral dispersing film. The appropriate dispersing ratio of the amount of surfactants and dispersing agent were 1% and 4%, also the stability dropped in the PEG molecular weight of 4000 or more. Drying time of oral dispersing film was $90^{\circ}C$ for 10 minutes to 12 minutes that dispersing film's property about flexibility, detachability were very good. The oral dispersion film's content used PEG 400 was $98.6{\pm}0.5%$ and the most uniform. As the molecular weight of PEG increased, dissolution time also increased. On the basis of evaluation parameter, PEG with 400~600 of molecular weight was selected as good dispersing agent in oral dispersing film. Therefore, it can be suggested guideline of preparation application study in oral dispersing film.

A Study on Polyurethane Treatment of Fabric - Synthesis of Water Dispersing Agent, and Anti-static and Softening Finishing - (직물의 우레탄처리 가공 - 수분산성 가공제의 합성과 대전방지 및 유연가공에 대하여 -)

  • Ahn, Young-Moo
    • Fashion & Textile Research Journal
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    • v.3 no.1
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    • pp.42-47
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    • 2001
  • The hardening system of polyurethanes has usually caused by air pollution. bad working condition and fire hazard according to using orgarnic solvents. Therefore there have been researched on emulsion, water soluble and colloid-dispersion based water soluble instead of using organic solvents recently. This study synthesized polyurethane dispersing particle by means of mixing precursor and neutralized emulsion method. In the first step, polyurethane was preparated from isophorone diisocyanate and poly (ethylene-adipate) glycol, and got precursor by introducing dimethyl propionic acid as a hydrophilic group. Synthesized polyurethane was bonded to the surface of fiber and crosslinked as a anti-static agent, and then looked for the change of color and softening property.

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Synthesis Conditions and Rheological Characteristics of Aluminum Magnesium Silicate (규산알루민산마그네슘의 합성조건과 유동학적 특성)

  • 신화우;정동훈
    • YAKHAK HOEJI
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    • v.39 no.1
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    • pp.68-77
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    • 1995
  • Aluminum magnesium silicate was synthesized by reacting the mixed solutions of sodium aluminate and magnesium chloride with sodium silicate solution in this study. The optimal synthesis conditions based on the yield of the product has been attained according to Box-Wilson experimental design. It was found that the optimal synthetic conditions of aluminum magnesium silicate were as follows: Reaction temperature=$69~81^{\circ}C$; concentration of two reactants, sodium aluminate and magnesium chloride= 13.95~14.44 w/w%; molar concentration ratio of the two reactants, [NaAlO$_{2}$]/MgCl$_{2}$]=3.63~4.00; reaction time= 12~15 min; drying temp. of the product=$70~76^{\circ}C$. Aluminum magnesium silicate synthesized under the optimal synthesis condition was dispersed in 0.75, 1.0 and 1.5w/w% aqueous solution or suspension of six dispersing agents, and the Theological properties of the dispersed systems prepared have been investigated at $15^{\circ}C$ and $25^{\circ}C$ using Brookfield LVT Type Viscometer. The acid-consuming capacity of the most excellent product was 272~278 ml of 0.1N-HCl per gram of the antacid. The flow types of 5.0 w/w% aluminum magnesium silicate suspension were dependent upon the kind and concentration of dispersing agents added. The apparent viscosity of the suspension was generally increased with concentration of dispersing agents and was not significantly changed or decreased as the temperature was raised. A dispersing agent, hydroxypropyl cellulose suspension, exhibited an unique flow behavior of antithixotropy. The flow behavior of the suspension dispersed in a given dispersing agent not always coincided with that of the dispersing agent solution or suspension itself.

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Microencapsulation of Dibutylphthalate by Interfacial Polymerization (계면중합에 의한 Dibutylphthalate의 마이크로 캡슐화)

  • 박차철;김호정;김한도
    • Textile Coloration and Finishing
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    • v.7 no.3
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    • pp.15-21
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    • 1995
  • Polyurethane microcapsules containing dibutylphthalate(DBP) were perpared by the interfacial polymerization using diisocyanates and polyois. Effects of chemical structure of PU, dispersing agent and polymerization time on the mean diameter of microcapsules were investigated. The releasing of DBP from microcapsules depended on the chemical structure of PU and solvents. The diameter decreased with increasing dispersing agent concentration, and it is decreased in the order of the dispersing agents using gelatine > PVA > arabic gum at the same concentration. A slight increase in the diameter was observed when the ratio C$H_2$/OOCNH of PU was increased. As the ratio C$H_2$/OOCNH of PU was increased, the amount of extracted DBP for hexane using as a extracting solvent was decreased, however, it was not changed for THF.

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A Study on the Bleeding Property of Flowed Concrete Due to Different Types of High Range Water Reducing Admixtures (고성능감수제 종류에 따른 유도화콘크리트의 Bleeding특성)

  • 김기수;하재담;김동석;신규연;유규홍
    • Proceedings of the Korea Concrete Institute Conference
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    • 1997.10a
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    • pp.321-326
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    • 1997
  • Recently, High Range Water Reducing Admixture be used increasingly in other to improve the demanded properties (fluidity, strength, durability etc.) and workability in concrete. These kinds of agent govern quality characteristics (air content, setting time, slump, bleeding etc) by the difference of its dispersing mechanism and performance in manufacture of flowed concrete. Accordingly, in this study, for the purpose of high quality construction in site, the comparative experiment of dispersing ability due to commercially available three types of agent were carried out in paste, mortar and concrete using tow types of cement (I, V). In conclusion, the bleeding reduction by the dispersing ability of agents was verified in the fresh properties of flowed concrete with sea water resistance.

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A Study on Properties of UV-Curing Silver Paste by Dispersing Agent Characteristic (분산제 특성에 따른 UV 경화형 Ag Paste의 물성 연구)

  • Son, Min-Jeong;Nam, Su-Yong;Kim, Sung-Bin
    • Journal of the Korean Graphic Arts Communication Society
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    • v.30 no.2
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    • pp.59-68
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    • 2012
  • As one of the eletronic device industries has been developed by using a recent printing method, the consumption of Ag paste has been on the rise as well. The printing method has simple processes in comparison with other methods. Also it enables to be large-scaled and to lower price ranges. If UV curing system would be applied to the printing method, energy consumption and dangerousness from curing system can be minimized in a short period of time so that its method can be more eco-friendly. This study conducted an experiment in order to make UV curing Ag paste which is feasible to implement micro patterns with different dispersing agents. The purpose of the study is to analysis the suitable printability for micro pattern and to test dispersibility, hardening properties, conductivity and adhesive stength by measuring viscosity, TI(thixotropy index), G', G", $tan{\delta}$(G"/G') after making paste. We have experimented with four dispersing agents. After We did an analysis of characteristic of rheology, conductivity and adhesive stength, etc, We confirmed that the paste added FP 3060 has excellent dispersibility, conductivity and adhesive stength. If the paste has excellent dispersibility, we will expect that micro pattern is made by that.

A Study on Microencapsulation of Perfume and Antibiotics by In-situ Polymerzation(I) (In-situ 중합에 의한 향료와 항균제의 마이크로 캡슐화에 관한 연구(I))

  • 박차철;정영진;박찬영;민성기
    • Textile Coloration and Finishing
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    • v.9 no.6
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    • pp.68-73
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    • 1997
  • Urea/formaldehyde(UF) and melamine/formaldehyde(MF) microcapsules containing perfume and 2,4,4'-trichlroro-2-hydroxydiphenyl ether(DP) were prepared by the in-situ polymerization using urea and formaldehyde. Effects of dispersing agent, accelerating agent, formaldehyde, agitation speed on the mean diameter of microcapsules were investigated. The diameter of microcapsule was decreased with increasing dispersing agent concentration. A slight increase in the diameter was observed when the concentration of film forming material was increased. The diameter of microcapsule was decreased with increasing agitation speed up to 8,000rpm. The mean diameters of UF microcapsule prepared at 8,000rpm are about 3$\mu$m. A slight decrease in the diameter was observed when the concentration of resorcinol was increased.

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