Low PH soy flour-non urea diluent and methods of making same
A diluent and cross-linking agent technology, applied in the field of low pH, non-urea diluent of soybean flour and its preparation, can solve the problems of high viscosity, impractical, low solids, etc.
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Embodiment 1
[0067] Example 1: Several soy-diluent systems were prepared using various diluent types and amounts and varying total solids and final pH.
[0068] Standard preparative procedure: Add water and non-urea diluent to a round bottom flask. Sodium bisulfite was then added to the dry soybean flour at a concentration of 1%. Soy flour is then added over 1-5 minutes while stirring rapidly. The mixture was stirred for 15-30 minutes. The pH was then adjusted to the desired endpoint by dropwise addition of 50% sulfuric acid. Table 1 below shows the characteristics of these specific examples.
[0069] Table 1
[0070] Characteristics of the soy-diluent product of Example 1
[0071]
[0072] Note: G=glycerin, EG=ethylene glycol, PPG=propylene glycol, PEG=polyethylene glycol
[0073] The results in Table 1 demonstrate the versatility of the invention to produce high solids, low viscosity adhesives over a wide range of diluent types and concentrations.
Embodiment 2
[0074] Example 2 - Mixing with pMDI:
[0075] Several basic resins described in Example 1 and pMDI (Rubunate TM FC3345) to evaluate the effect on both the binding performance (measured by the ABES method) and on the physical properties. The non-urea diluents chosen were glycerin (G), ethylene glycol (EG) and PEG-8000MW (PEG). Mix briefly in a beaker or round bottom flask for 5 minutes prior to evaluation. The overall mixture is homogeneous and easy to handle. The characteristics of these mixtures are shown in Table 2.
[0076] The dry and wet strengths of the adhesives described in Table 2 were evaluated using the ABES method. These results are presented in Table 3 and figure 1 and 2 middle.
[0077] Table 2 Soy blended with pMDI: Properties of the diluent
[0078]
[0079] Table 3 Soybean mixed with pMDI: Binding strength of diluent (ABES)
[0080] Example
[0081] Discussion of Example 2: The addition of pMDI to the soy-diluent system produced final adh...
Embodiment 3
[0082] Example 3: Soybean Mixed with pMDI: Viscosity and Viscosity Stability of Diluent (S:G=1:1) (pH<5)
[0083] A notable feature of the present invention is that it not only enables the production of high solids and low viscosity resins, but also adhesive formulations which exhibit significantly improved viscosity stability over the prior art.
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