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- Silicone Oligomer Type R
Silicone Oligomer Type R
Type R silicone oligomers have reactive functional groups such as epoxy and acrylic groups, and can be copolymerized and co-modified with other organic materials. The siloxane structure is expected to improve heat resistance.
Type R products are categorized into alicyclic epoxy group and acrylic group products. The alicyclic epoxy group products, which also form a cured film on their own, are mainly used to control the curing shrinkage of epoxy compounds, add heat resistance, and improve leveling. In addition, acrylic-based products contribute to the suppression of cracking of multifunctional acrylic compounds.
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| How to Use | Performance Features | ||
|---|---|---|---|
| Type A | Methyl group | Main component, resin hybridizer | High hardness, water repellency, curability |
| Methyl group, Phenyl group | High gloss, compatibility, crack and peeling resistance | ||
| Type AR | Epoxy group | Coupling agent between organic resin and inorganic material | Adhesion improvement |
| Mercapto Group | Adhesion improvement | ||
| Acrylic group | Adhesion improvement | ||
| Methacrylic group | Adhesion improvement | ||
| Vinyl group | Flame retardancy improvement | ||
| Type R | Alicyclic epoxy group | Main component and hybridizer for epoxy and acrylic compositions | Low cure shrinkage, heat resistance |
| Acrylic group | Flexibility and crack resistance | ||
Alicyclic Epoxy Group Type
These silicone oligomers have only epoxy groups as reactive functional groups, and can be cured by acid anhydride, light or heat cationic curing. While the curing mechanism is similar to that of epoxy resins, they possess the heat resistance and high Tg of siloxanes. In addition, the type with a cyclic siloxane structure has the advantage of minimal shrinkage during curing.
Features
- These silicones contain reactive functional groups.
- Comparatively low molecular weight and excellent compatibility with various materials.
- Cures by light or heat when an acid generator is added.
- Heat curing by addition of acid anhydride, amine catalyst, etc.
- KR-470 has excellent curability, hardness and strength after curing.
- KR-470 has almost no shrinkage during curing.
General Properties
| Item/Product Name | KR-470 | X-40-2678 | X-40-2669 |
|---|---|---|---|
| Type | Cyclic siloxane | Cyclic siloxane | Linear siloxane |
| Features | Low cure shrinkage, high cross-linking | Crack resistance | Lower viscosity than KR-470, excellent leveling and wetting properties |
| Number of epoxy functional groups | 4 | 2 | 2 |
| Viscosity at 25°C (mPa-s) |
3,000 | 120 | 35 |
| Epoxy equivalent (g/mol) | 200 | 290 | 200 |
(Not specified values)
Comparison of Curing Properties
| Item/Product Name | KR-470 | Epoxy | Alicyclic epoxy | |
|---|---|---|---|---|
| Cure method | Acid anhydride curing | |||
| Hardness: Shore D | 87 | 85 | 88 | |
| Bending Modulus (MPa) | 2,590 | 2,940 | 3,020 | |
| Cure shrinkage Specific gravity method (%) | +2.1 | -1.7 | -5.3 | |
| Water absorption rate by boiling (%) | 0.46 | 0.28 | 0.56 | |
| Tg (°C) | 191 | 150 | 193 | |
| Coefficient of linear expansion (×10-5/K) | <Tg | 9.7 | 7.7 | 6.9 |
| >Tg | 15.4 | 17.6 | 16.2 | |
(Not specified values)
Acrylic Group Type
X-40-2761 can be used as a resin itself (film) or as a modifier for other radical curing resins.
Used as a Resin Itself (Film)
Hardened film with excellent bending resistance
- Bending resistance
- High hardness
Used as a Resin Modifier
- Adding crack resistance and slipperiness (pleasant to the touch)
- Compatible with the following organic solvents, acrylates and various photoinitiators
- Organic solvents:
- PGM, IPA, cyclopentanol, ethanol, methyl acetate, butyl acetate, toluene, xylene, etc.
- Acrylate:
- DPHA, TMPTA, HDDA, A-TMM-3L, etc.
Comparison of physical properties by mixing with DPHA (0.6mm film)
Sheet Properties
| Pencil Hardness: Thickness 0.6mm | 4H |
|---|---|
| Flex resistance Thickness 0.2 mm (φ) | 2mm |
(Not specified values)
.
| Formulation ratio X-40-2761/DPHA (wt%) | 0/100 | 20/80 | 30/70 | 40/60 | 50/50 | 60/40 | |
|---|---|---|---|---|---|---|---|
| Hardness Thickness 0.6mm | Pencil hardness | 9H | 9H | 9H | 5H | 4H | 3H |
| Shore D | 96 | 90 | 87 | 85 | 83 | 80 | |
(Not specified values)
- UV Curing Conditions:
- High-pressure mercury lamp 600mJ/cm2, nitrogen atmosphere, 1Pass
- Photoinitiator:
- Add 5 wt% of Darocur 1173 to solid content
X-40-2669
X-40-2669
- Relatively low molecular weight and excellent compatibility with epoxy resins
- Good leveling and wettability with linear siloxane structure
- Low viscosity and effective as a reactive diluent
X-40-2761
X-40-2761
- Acrylic equivalent 330g/mol
- This product imparts flexural resistance to acrylic resins.
- This product has excellent compatibility with acrylic resins and various photoinitiators.
- This product is applicable to UV/EB curing systems.
KR-470
KR-470
- Relatively low molecular weight and excellent compatibility with epoxy resin
- Low shrinkage during curing due to cyclic siloxane structure
X-40-2678
X-40-2678
- Relatively low molecular weight and excellent compatibility with epoxy resin
- Less shrinkage during curing due to cyclic siloxane structure
- Good crack resistance due to di-functionality
KR-2710
KR-2710
- Flame retardant agents for polycarbonate
- Good transparency
X-48-5030
X-48-5030
- UV curable, good curability under air
- Low viscosity, excellent scratch resistance and low warpage
- Compatible with coating methods that require low viscosity, such as spray coating
X-48-5031
X-48-5031
- UV curable, good curability under air
- Contains UV absorbers for superior weather resistance
- Low viscosity, excellent scratch resistance and low warpage
- Compatible with coating methods that require low viscosity, such as spray coating