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Tech. Info Micronized Silica

Micronized Silica (SS-SIL)

When acid is added to sodium silicate, silica sol with primary particle is created. Radical dehydration condensation reaction is promoted at silanol (Si-OH) on the surface of primary particle by continuous adding of acid. As a result, net work(Si-O-Si) is formed and three dimensional strutures are generated. This is so called Silica gel. Physical properties are controlled via washing and drying processes and finally Micronized silica is produced by grinding it. Theoretically very simple but practically very delicate high tech industry it is to control each physical property on each application. Amorphous porous silica gel is raw material of SS-SIL and according to the degree of porosity basic properties are diversified. SS-SIL has various grades according to the difference of particle size or surface treatment (coating or substitution). SS-SIL has irregular three dimensional network structure having SiO₄ regular tetrahedron a basic structure that it's amorphous without regular structure like quartz. the inner part and the surface of silica gel with three dimensional network structures have a lot of silanol (Si-OH) that shows porous structure.
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01 Manufacturing process

Silica hydrogel as a raw material of SS-SIL is composed by following mixing reaction between strictly selected sodium silicate and sulfuric acid.

Na₂Oㆍ3.4SiO₂ + H2SO₄ → Na₂SO₄ + 3.4SiO₂

Once silica gel manufactured by above reaction follows washing and drying process to get desirable physical properties. Next by grinding it, make a variety of SS-SIL grades with controlling particle size and shape, coherence among particles and filling structure of particles. The applications of SS-SIL are not only film, paint, ink, paper industries but also tooth paste, medicine, food industries because it's not harmful to human body.

02 Matting agent for paint, ink

페인트
SS-SIL as a matting agent is applied to lacquer, polyurethane, epoxy, alkyd, metallic paint and ink. The typical properties of Micronized silica to make matting effect are to have excellent stability of luster, to have smooth surface film, not to form hard cake by precipitation in paint, etc. To select optimum grade of SS-SIL is also important because each kind of resins has its own property. To disperse intensely in a long time is avoided because matting effect is also changed by disperse condition.

    Advantage of SS-SIL for paint industry

  • No haze formation.
  • Good transparency property.
  • Easy disperse.
  • No effect on drying characteristics.
  • No effect on intercoat adhesion.
  • Excellent scratch and impact resistance.
  • high flexibility

We are producing various grades of SS-SIL as a matting agent and ceaselessly developing new products to satisfy customer's desire.

03 Anti-blocking and processing aids for PLASTIC

SS-SIL as an anti-blocking agent is applied to various kinds of plasitc film such as PE,PP,PET,Nylon and PVC, etc lf Silica is not used in plastic film making process, the films stick together during rolling process. To protect this phenomenon we add SS-SIL which forms fine projections

    Advantage of SS-SIL in plastic

  • Excellent dispersiblity.
  • Reproducible product quality.
  • Stopping the blocking effect of polymer film.
  • A beautiful finish to film, sheet and extrudes.
  • Giving molds the release they need.

The properties of Micronized Silica as an anti-blocking agent are maintaining transparency with the same refractive index of film and not being condensed between silica in film. Selecting anti-blocking agent for plastic film is very important because it has great effect on manufacturing condition and quality level of the film.

04 Processing aid for PAPER

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SS-SIL is extremely effective when mixed with the undercoat to improve sensitively, or when mixed with the topcoat to improve storage properies. if SS-SIL is used with ink jet recording paper, first the ink observed better, plotting is prevented and perfectly round dots are formed with reproducibilty, second high image density is obtained together with crisp, clear color.

    SS-SIL as a filler or processing aids for papers is available in grades with different
    properties in the following recording papers

  • Thermosensitive paper.
  • Ink jet recording paper.
  • Diazo photosensitive paper.
  • Tracing paper.
  • Electrostatic for recording paper.
  • Multi purpose paper.

Thermosensitive recording paper is widely used in facsimile machines, printers and labels due to its high reliability, simplicity and high speed. Thermosensitive paper consists of a thermosensitive coloring layer coated onto a base paper to a thickness of several microns. This layer develops a color when it is heated by a thermal head or a thermal pen, and thus permits recordings to be made. Mixing SS-SIL with thermal colorants offers the following advantages.

1. A pure white thermosensitive paper is obtained and there is no soiling of the undercoat
2. Smudge adhesion and sticking are effectively prevented.
3. Excellent coloring properties are obtained.

05 Other applications

Filtering agent

SS-SIL has great influence on manufacturing pure drink by filtering protein in it. SS-SIL is not harmful to human body because it is highly refined and has excellent adsorptive powder owing to plenty of minute pores strictly controlled. By controlling moisture contents it prevents dusts on working.
Application : beverages (beer, drink), food, edible oil.

Moisture remover/ coagulation preventer

If moisture exists in zinc paint for or alumina paint, hydrogen gas occurs and it makes crack. Micronized powder makes heterogeneous color distribution owing to moisture during storage, transport and handling. SS-SIL has great adsorptive powder thus when added to power-type products, moisture is easily removed. Also it's not harmful to human body, SS-SIL makes it possible to take food custody for a long time when used as a food additive. Application : instant food, powder-type food (salt, sugar), animal food.

Powder additives

SS-SIL can store liquid additive, perfume or effective component because it's not harmful, has lots of minute pores and microscopic particle size. Also these components can be changed to powder-type and quantitative input is easily controlled Application : tooth pastes, medicines, foods, chemicals, etc.

Dentifrice

SS-SIL is used as functional material tooth paste because it's high purity micronized powder which is chemically stable. Comparing to normal precipitation silica it has high purity and low bulk density thus additive efficiency is excellent
Application : tooth pastes, medicines.
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