Products > Tackifying Resin > SL-3022 ADHESION PROMOTER RESIN
 
 

SL-3022 ADHESION PROMOTER RESIN

DESCRIPTION
  • SL-3022 resin is the reaction product of resorcinol, styrene and formaldehyde with no free formaldehyde.R=H or Aralkyl or Styrene
  •  
    CHARICTERISTICS

    SpecificationProperty

    Specification

    Test Method

    Appearance

    red-brown pastille

    visual

    Softening Points,(Ring & Ball),

    95 - 109

    WI-QC-102

    Moisture Content, %

    1.0max

    WI-QC-117

    Free Resorcinol,%

    2-6

    WI-QC-107

    PH,50%alcohol-aqueous solution

    4-6

    WI-QC-113

     
    PROPERTIES
  • SL-3020 is a non-hygroscopic product. This material can be stable for 18 months under the normal storage conditions. However, precautions must be taken to avoid exposure to sunlight and always, store this material in a sealed container under the dry and cool conditions
  •  
    PACKAGING
  • 25Kg(net weight), Kraft bag inner PE coated or PE bag
  •  

    STORAGE

  • Refer to the Material Safety Data Sheet prior to using this resin. Resin may be irritating to eyes and skin. In case it contacts with skin or eyes, you should flush it with water immediately and then go to see doctor.
  •  
    APPLICATION PROPERTIES
  • 1) SL-3020 is abroadly used in rubber adhesion system. This resin can enhance the adhesion between rubber and steel wire or synthetic fibers.
    During the vulcanization of rubber compounds, resorcinol based SL-3020 resin can react with the methylene or formaldehyde donor materials, such as hexamethoxymethylmelamine(HMMM) and hexamethylenetetramine (HEXA), to form cross-linked network structures. There are two types of reaction expected with SL-3020 resin during the rubber curing process. The first cross-linking reaction, which can produce a chemical bond between the reinforcing cords and resin, enhances the adhesion between rubber and cords. Another cross-linking reaction, which may occur during rubber vulcanization between the resin and double bonds of rubber molecules, enhances the cured rubber compounds physical and mechanical properties. SL-3020 resin retains good adhesion properties of brass plated steel cords to rubber compounds under the heat, humidity and salt aged conditions. Therefore, SL-3020 is an ideal adhesion promoter to enhance the adhesion between rubber and the synthetic fiber cords and brass or bronze coated steel cords, particularly in truck, bus and passenger tire applications.

  • 2) SL-3020 resin overcomes the fuming problems associated with the use of resorcinol or R-80 products in rubber compounds. The superior performance of SL-3020 compared to R-80 (resorcinol) can be seen from the thermo-gravimetric (TGA) analysis curves obtained at different temperatures.
    From the TGA curve results, it is obvious that R-80 is highly volatile when the temperature exceeds 150 oC, which could exhibit very high fuming during rubber compound mixing. On the other-hand, SL-3020 resin shows higher thermal stability and lower volatility (less fuming) at elevated temperatures than resorcinol. This very low free resorcinol containing SL-3020 resin is superior to other commercially available products.

    Curve1: Thermogravimetric Analysis (TGA) curves of SL-3020 resin and R-80 blend.

    The temperature employed during the first stage rubber compound mixing is always between 160 and 180 oC. At this mixing temperature, the highly volatile resorcinol fumes heavily. Therefore, resorcinol or resorcinol containing resins are mixed with the rubber compounds in the second mixing stage. But SL-3020 resin, due to low free resorcinol, can be added at the first stage of rubber mixing and does not exhibit significant fuming at the high mixing temperature. The addition will not affect the adhesion performance of SL-3020 resin in reinforced rubbers.

  • 3) Controlled laboratory experiments showed that SL-3020 resin not only enhanced the adhesion of brass or bronze coated steel wires or cords to rubbers, but also improved the physical and mechanical properties of un-aged and aged rubber compounds. The following curves were obtained for SL-3020 and R-80 based rubber compounds. Dynamic storage modulus (G) and hysteresis (Tan ) properties were determined at different frequencies. From the data, it is very obvious that SL-3020 resin showed very high modulus and low hysteresis (much less heat generation) compared R-80 (resorcinol). This suggests that SL-3020 resin can exhibit or show outstanding performance in tire related applications.
    Curve 2: Plot of Dynamic Storage Modulus (G) as a function of frequency 

    Curve 3: Plot of Tan (hysteresis) properties of SL-3020 resin and R-80

    4) Note:
    4.1) It is suggested that the level of SL-3020 should be 1.5-2.0 phr in resorcinol-formaldehyde (RF) system. For the rate of SL-3020/HMMM, 1:1.01:1.5 is recommended. Too much HMMM can result longer cure time.
    4.2) Compared with resorcinol, SL-3020 shows longer cure and scorch time, it also gives compound much better adhesion, higher hardness and dynamic modulus.
    4.3) SL-3020 is recommended to add at the second mixing stage.

  •