推薦各型號氣相二氧化硅在液體樹脂中應用
產(chǎn)品推薦
Recommended products for thickening and thixotropy in liquid resins
Unsaturated polyester resins are relatively non polar, as in most cases the reactive diluent styrene is used. For this reason, hydrophilic AEROSIL® fumed silica is the thickening agent of choice. AEROSIL® 200 is widely used for laminating resins and gel coats. Nowadays the more efficient product AEROSIL® 200 HV is recommended.
Some specialty polyester resins and vinyl ester resins, which have more polar character, require hydrophobic AEROSIL® products. AEROSIL® R 202 performs excellent in such formulation, while hydrophilic AEROSIL® fumed silica will not give sufficient thickening efficiency.
The following table shows the typical applications and effects for the use of AEROSIL® and SIPERNAT® products in UP resins and gives recommendations for grades and dosage.
| Application | Effect | Product |
Dosage [wt.%] |
Remark |
|---|---|---|---|---|
| Clear | Rheology |
AEROSIL® 200 / AEROSIL® 200 HV |
1.0-2.0 | |
|
Filled/ colored w/talc, TiO2 etc. |
Rheology Porosity |
AEROSIL® 200 / AEROSIL® 200 HV SIPERNAT® 22 LS |
2.5-4.5 |
Ratio 40 percent (AEROSIL® 200) with 60 percent (SIPERNAT® 22 LS) to start. Similar usage in putties and pastes |
|
Dark colored non-white |
Rheology Blush Resistance |
AEROSIL® 200 / AEROSIL® 200 HV SIPERNAT® FPS-5 |
2.5-4.5 |
For marine gel coat High purity ppt. silica |
| General |
Rheology control Mechanical properties |
AEROSIL® R 202, AEROSIL® R 208 | 6.0-10.0 | In most cases based on VE and EP resin. When UP resin is used AEROSIL® 200 HV is recommended |
| Application | Effect | Product |
Dosage [wt.%] |
Remark |
|---|---|---|---|---|
| General | Rheology control |
AEROSIL® 200 / AEROSIL® 200 HV |
0.8-1.3 | |
| Low styrene | Rheology control |
AEROSIL® 200 / AEROSIL® 200 HV SIPERNAT® 22 LS |
0.8-2.5 |
For environmental resins Rising viscosity with less solvent |
| General |
Rheology control Mechanical properties |
AEROSIL® R 202, AEROSIL® R 208 | 6.0-10.0 | In most cases based on VE and EP resin. When UP resin is used AEROSIL® 200 HV is recommended |
| Application | Effect | Product |
Dosage [wt.%] |
Remark |
|---|---|---|---|---|
| General |
Rheology control Mechanical properties |
AEROSIL® R 202, AEROSIL® R 208 | 6.0-10.0 | In most cases based on VE and EP resin. When UP resin is used AEROSIL® 200 HV is recommended |
The data represents typical values
