Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Plastics & Elastomers Functions
- Technologies
- Product Families
Features & Benefits
- Advantages of CASABOND 1200 Series in Rubber Compounding
Improved Handling – The flaked form of the CASABOND 1200 series facilitates resorcinol dispersion and improves general health and safety characteristics, when compared to commercial grades of crystalline resorcinols.
Improved Dispersion – The resorcinol within CASABOND 1200 / 1201 / 1202 / 1203 is finely predispersed within the fatty acid carrier. In this form it disperses more efficiently, upon addition in to the rubber compound, compared to the relatively large crystalline particles of commercial resorcinol.
Reduced Energy Consumption – the CASABOND 1200 series disperse efficiently in rubber compounds, and may be used at temperatures below 90° C. When using a crystalline resorcinol grade it is generally necessary to increase such processing temperatures to 115-120°C, in order to melt and ‘flux’ the resorcinol and thereby adequately disperse the ingredient in the rubber compound. Reduced processing temperatures offer reduced energy consumption through the use of CASABOND 1200 products.
Reduced Fuming – At high processing temperatures, fuming problems are likely to be associated with the use of crystalline resorcinol. The use of CASABOND 1200 products can minimize this fuming through the lower processing temperatures that are required to achieve good dispersion, when compared with crystalline resorcinol.
Range of Compositions – the CASABOND 1200 series offers a convenient range of compositions.
Applications & Uses
- Applications
- Compatible Polymers & Resins
- Plastics & Elastomers End Uses
- Recommended Applications
Typical finished products include: -
- Hoses - Textile or wire reinforced: hydraulic / oil suction / discharge hoses.
- Belting - Textile or wire reinforced: conveyor- / transmission- / V-belting.
- Tires - Textile or wire reinforced: passenger / truck / aircraft tires (both cross-ply and radial)
- Rubberised Fabrics - Protective clothing; tarpaulins; diaphragms with synthetic, woven fibers.
- Recommended Dosage
Direct bonding systems generally require 2.5 – 3.0 pphr of resorcinol, the recommended level of CASABOND 1200 series is therefore 3.0 – 4.0 pphr. In addition, it is necessary to add 1.5 – 2.0 pphr of a methylene donor, e.g. HMT (hexamethylene-tetramine). Up to 10.0 – 15.0 pphr addition of reinforcing silica is beneficial, offering a further improvement of bond strength.
Properties
- Appearance
- Free-flowing flakes
- Typical Properties
| Value | Units | Test Method / Conditions | |
| Assay (Resorcinol) | 75 | % | — |
Technical Details & Test Data
- Bonding Systems
Casabond™ 1200 are proprietary blends of resorcinol and stearic acid, in the ratios 75:25, 66:34, 60:40, 80:20 respectively. The products are prepared as homogeneous melts of the two ingredients, with the active resorcinol dispersed in a finely-divided form within the fatty acid matrix.
The products are recommended for use in compounded direct-bonding systems, in applications involving rubber-to-metal and rubber-to-textile adhesion. The products can be formulated into systems based on natural rubber, SBR, BR, NBR, EPDM, CR and blends of NR/SBR, NR/BR and BR/SBR. Incorporated into compounds prepared from these elastomers, during vulcanisation the Casabond 1200 series will enhance adhesion to brass- and zinc-coated steel. Direct bonding of textiles such as rayon, nylon and polyester, as well as glass and aromatic fibers, may also be carried out using elastomeric compounds containing CASABOND 1200 products. Resorcinol-based adhesion promoters require the presence of a methylene donor such as hexamethylenetetramine (HMT) or hexamethoxymethylmelamine. Where HMT is employed it is desirable to use this in a pre-dispersed form, thereby ensuring efficient and effective distribution of the methylene donor. Direct bonding compounds that contain HMT may be detrimental to polyester fibers at high temperatures. Other methylene donors are therefore preferred in these particular applications, such as hexamethoxymethylmelamine (HMMM).
Direct bonding compounds are usually prepared by two-stage mixing techniques. The methylene donor, along with the sulfur and accelerator, are added during the second mixing stage. This ensures good processing safety. CASABOND 1200 grades may be added at either the first or second mixing stage (except where the elastomer is polychloroprene, in which case second-stage addition is essential). Direct bonding compounds for rubber-to-metal applications usually require 3 - 4 pphr of sulfur. Insoluble sulfur is the preferred grade, thereby avoiding the blooming that is associated with soluble, rubber-grade sulfur.The use of sulphonamides is recommended, particularly N,N-dicyclohexyl-2-benzothiazole sulphonamide (DCBS) or 2-(morpholinothio)benzothiazole (MBS). High levels of adhesion result from the in-situ chemical reaction, at vulcanising temperature, between the resorcinol and the formaldehyde that is liberated from the methylene donor. The addition of reinforcing silica is claimed to catalyze the R/F reaction and contribute to the adhesion of the rubber compound to the substrate. A combination of these three ingredients, when incorporated into a rubber compound, is the basis of the R.F.S. (Resorcinol / Formaldehyde / Silica) bonding system.
Packaging & Availability
- Packaging Type
- Packaging
25kg bags.
Storage & Handling
- Shelf Life
- 24 months