RISUN 20000E
Chemical Composition, Low Monol silyl terminated Polyether with trifunctional methoxy groups.
Physical form, Clear thick liquid, viscosity approx 20000 Mpa. S.
CAS 216597-12-5.
This is a low monol STPP hybrid polymer based on polyether of approx 24000 MW. The shore A hardness of the resin cured with DBTDL is approx 20.
The resin is designed to be used with DIDP plasticizer and precipitated calcium carbonate to formulate construction and other joint sealants with shore A hardness in the range of 15 to 25.
The trifunctional methoxy groups can be catalyzed to cross link with various chemicals that are well known, however extra vinyl silane needs to be added in compounding, and the use on methanol can further retard the cross linking reaction when used in thick walled HDPE cartridges.
The advantage of the STPP resin with very low monol polyether is that a high level of DBTDL plasticizer can be added, and the sealant cures with no residual surface tack.
Use epoxy silanes and secondary amino silanes for superior adhesion as construction sealants.
Application:
The main requirements for exterior sealants are:
Low modulus even at low temperatures
Excellent UV resistance
High colour stability and no colour change
Good adhesion to porous and non-porous substrates
High tear resistance
Paint ability when needed
Resistance to cleaning procedures
Bubble free Curing
No surface tack that gathers dust and dirt
Hybrid sealants based on Risun 30000T meet the above requirements.
Risun Polymer for Adhesive requirements
Adhesives for hard floors such as sports arenas require:
High mechanical strength and recovery
High vibration resistance
Good chemical resistance
Excellent adhesion properties
Moisture resistance
Hard sports surfaces such as these are placed on concrete slabs and the products required are:
Moisture resistant membrane based on Risun 30000T
Adhesive layer based on Risun 15000T
Expansion joints in the wood floor based on above construction sealant.
RISUN 20000E POLYMER ADVANTAGES:
Softest long chain polyether for lower shore A sealants with high movement capacity to 20% ASTM standards.
Enables bubble free curing at normal temperature & humidity levels.
Formulations have excellent adhesion to porous stone and concrete panels.
Excellent adhesion to aluminium with no primers and a wash with green dimethyl carbonate solvent is enough.
Risun20000E can be used to make a crystal water clear sealant where expensive stone is used.
Sealant formulations can use the cheaper PPC fillers now available to make thick sealant.
Sealants are solvent and isocyanate free and safer for tradesman and DIY consumers.
Sealants can be made in the factory with maximum mixer temperatures of 60 degree C and low energy use.
The trifunctional polymer is catalysed with low levels of tin containing chemical like DOTL or DBTDL.
No hazard warning labels on the sealant product when displayed in retail stores.
If you are interested in our new generation STPP, Please kindly contact us via (+86)13770998448 to Mr. Sean.
| Risun 20000E in Construction sealant Starting Formulation |
| Material | Parts by Weight |
| 1. Prepolymer | RISUN 20000E | 100 |
| 2. Plasticiser | DIDP or 2000MW Diol | 70 |
| 3. Filler | Omyacarb 2T | 170 |
| 4. Pigment | TIO2 | 20 |
| 5. Drying Agent | A171 and dry methanol | 5 |
| 6. ThixotropicAgent | Aerosil R972 | 10 |
| 7.Stabilizer and UV inhibitor | Tinuivin 765 and Irganox 1076 | 2 |
| 8. Adhesion Promoter | Secondary amino silane KBM603 | 2 |
| 9. Catalyst | DBTDL or DOTL | 0.5 |
| Total |
| 379.5 |
| Test Results |
|
| Standard |
| Tack free time | 60 | minutes |
| Shore A penetration | 34 | ISO 868 |
| Tensile strength at break | 1.2 Mpa | ISO 37 |
| Elongation at break | 320 percent | ISO 37 |
Risun Polymer Company core strategy is to design and manufacture the new silane modified STPP resins with Technology from Western Companies and manufacturing and R&D resources in Taizhou in China. We will taylor make resins for Customer needs, as well as offering a basic standard range.
The Customers we target are the worlds sealant and adhesive and surface coating manufacturers who wish to replace the polyurethane products they make with the safer, and in many cases easier to make silane crosslinked products.
The elimination of free NCO and residual TDI and MDI monomer is essential if we are to protect our Customer Customers from these hazardous chemicals.
Our Technical Director has had extensive background in Paint and Adhesives manufacture and R&D.
For example slump resistant low modulus PU Construction sealant with good adhesion is difficult to manufacture. The use of STPP or Hybrid silane crosslinked resin allows the use of precipitated calcium carbonates for good rheology and the ability to use secondary amino silanes as adhesion promoters makes the formulation of these new hybrid sealants much easier.
We have the ability to source Polyether polyols from the well known major manufacturers using the DMC catalyst process, and there are now several manufacturers in China. There are also now in China several reputable manufacturers of the special silanes, and we have used them for several years now.
Chinese manufacturing now offers very Competitive sources of Chemicals, as the Supply Chain and Quality is now good, all the major world chemical manufacturers are present, and we are using the latest equipment for quality control of the Chemicals we use.
Please contact us, as we are able to offer Custom resin design and provide formulation advice and confidentiality as expected in today's tough environment.
