Food & Feed Additives
Precipitated silicon dioxide, a form of synthetic amorphous silicon dioxide, is derived from quartz sand, a crystalline form of silicon dioxide. The physical properties of precipitated silica can be manipulated during the manufacturing process to deliver products with a wide range of performance-enhancing features engineered for many different end-use applications.
Chemical Name: Silicon dioxide
CAS No.:7631-86-9
Molecular Formula:O2Si
Molecular weight: 60.08
Appearance: White powder
H.S No.: 2811220000
silica hydrated white carbon black200-mesh, 600-mesh, 800-mesh
Here is a brief look at how precipitated silicon dioxide is made:
Step 1: Precipitation
Sodium silicate solution (water glass) and mineral acid are reacted in an agitated vessel to produce a slurry of amorphous silica particles. The critical physical properties of precipitated silica, such as particle size and porosity, are controlled during this stage of the process by manipulating, among other things, the composition, concentration, and ratio of reactants in the precipitating solution; the speed of agitation; the reaction time; and the reaction temperature.
Step 2: Washing
The precipitated silica slurry is then concentrated to form a filter cake. The product filter cake is washed to remove the salt byproduct that is produced during precipitation.
Step 3: Drying
The silica filter cake is then dried to the desired final product moisture content.
Step 4: Finishing and packaging
The dried silica is then finished to achieve the desired final product form. This can include: agglomeration or compaction into a low-dust form, or milling and classification to the required particle size distribution. The final product is packaged for shipment in small bags, big bags, or bulk trucks or railcars.
2. Specifications of precipitated silicon dioxide
Plastic Grade - XR Series
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Product Series |
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Plastic Grade |
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Type |
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XR601 |
XR602 |
XR603 |
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Physical Form |
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powder |
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BET |
m2/g |
70~90 |
200~220 |
220~240 |
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D50 |
um |
6~7 |
5~6 |
4~5 |
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Silica(dry basis) |
% |
≥98 |
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Drying Loss |
% |
4.0~8.0 |
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Ignition Loss (dry basis) |
% |
≤7.0 |
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pH(10% aqueous solution) |
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6.0~7.5 |
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DBP |
cm3/g |
0.6~1.0 |
2.2~3.5 |
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Sieve Residue 45um |
% |
≤0.5 |
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Cu |
mg/kg |
≤30 |
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Mn |
mg/kg |
≤50 |
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Fe |
mg/kg |
≤300 |
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3. Package and Delivery
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Package |
10KG/BAG, Paper Bag, Outside with PE Liner or as the clients' requirements. |
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Delivery |
Prompt shipment or Within 15 days after signing the contract. |
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Storage |
The precipitated silica should be stored in the dry and cooling place with good ventilation, avoiding exposure of the packaged product to direct sunlight. |
4. Applications:
1) Shoes-making industry: rubber outsole reinforcement agent similar to black carbon. It brings the light color and transparent appearance of rubber outsole with excellent performance
2) Tyre industry: decreases friction on ground sharply, and increases the tyre holding on the wet and icy ground. The bonding between curtain threads or woven material and rubber compound is improved;;
3) Silicon rubber: its aging, resilience and compression set are increased
4) Plastic industry: increases the plastic products' flexibility, strength and resistance to water
5) Coating industry: it provides the performance in preventing coating from aggregating and hanging down. It can increase the viscosity and dull the coating shine
6) Pharmaceutical industry: it gives a function of increasing the viscosity, floating and dispersing. It can be a carrier and an anti-lumping agent
5. Characters:
This product is amorphous form white powder,good insulativity,insoluble in water and common acid,while soluble in caustic alkali and hydrofluoric acid.No decomposition under high temperature.There is water imbibition ,non-poisonous,tasteless.
6. product feature:
1, color white, light as fluff, was fluffy.
2, chemical stability, non-toxic, odorless, non-flammable, safe to use.
3, when used in coatings, excellent transparency, excellent adhesion after spraying or brushing, drying smooth coating extinction efficiency
Excellent fruit, feel extremely smooth, does not affect the drying and curing paint
5, good suspension, there will be no lumps even after prolonged storage, processing unique dispersibility, good dispersibility, more Add gloss after adjustment beneficial. Best of transparency, the film does not cause yellowing and hair spray. For paint drying properties,Repainting and adhesion resistance had no effect and excessive grinding.
6, it can effectively prevent or reduce foam generation, to avoid resin agglomeration.
This product has good suspension, anti-settling and easy dispersion, excellent matting effect, anti-sagging and anti-scratch resistance. And no paint viscosity and transparency of influence, can also improve transparency, has no effect on the film recoat adhesion. 
7. Use:
Widely used in polyester paint, polyurethane paint, alkyd paint, lacquer, varnish or epoxy paint and other paint extinction; the product can still be applied to the printing, dyeing, printing ink, leather products and other industries extinction. Water-based coatings, water-based inks,water-based varnish, water-based printing and dyeing industries.
8. Packaging:
1.Packing specification:
10KG/ package,20KG/ package,25KG/ package,40KG/ package,50KG/ package,25 kg / barrel,50 kg / barrel,170 kg / barre,200 kg / barrel etc....
2.Part of the product packaging can be changed according to customer needs
