Abrasive compositions and methods for making same
A composition and abrasive technology, which is applied in botany equipment and methods, chemical instruments and methods, pharmaceutical formulations, etc., can solve problems such as increasing costs and processing time, graying, and reducing whiteness
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Embodiment 1
[0070] To evaluate the rheology and settling properties of the abrasive compositions of the dentifrices made in the present invention compared to comparative abrasive compositions from dry and dry ground silica, silica was first prepared as described below.
[0071] Preparation of silica wet cake:
[0072] Silica Wet Cake 1 (WC1):
[0073] To a 1000 liter stainless steel reactor equipped with a jacket for steam heating was added 24.8 liters (L) of sodium silicate (13.3% Na 2 O, SiO 2 : Na 2The molar ratio of O is 2.65; the specific gravity is 1.123). The A200 Lightin stirrer placed inside the reactor was set to 120 rpm. The reaction system also has an external circulation loop with the inlet of the loop at the bottom of the vessel, the return port near the top of the reactor, and suitable piping is provided between these components, the loop includes Labour ASME B73.1 (Sterling Fluid System). ) centrifugal pump, flow control manual valve and Silverson 450 LS in-line mixer...
Embodiment 2
[0097] In order to investigate the rheological stability of the wetting agent fluidized abrasive compositions (ie, slurries) based on silica prepared by the preparation methods of Silica Wet Cake 1 and Silica Wet Cake 2 in Example 1 , the following sedimentation studies were performed. The slurry was prepared using the experimental method above entitled "Fluidization of Silica Wet Cake", except that Silica Wet Cake 3 was treated for these studies. Included are Comparative Experiments 3B, 3D, 3F and 3H, in which a certain amount of polysaccharide binder was also added to the slurry during slurry preparation.
[0098] Silica slurry sedimentation test method:
[0099] 1. After storing the fluidized silica samples for a specific test period (three weeks) in a greenhouse (25°C) without agitation, measure the total weight of the slurry and container.
[0100] 2. Measure the height of the slurry, position the blades of the agitator at half the height of the slurry in the vessel.
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Embodiment 3
[0110] In order to study the interaction and stability of the above fluidized silica blended with antimicrobial preservatives, the following bioburden studies were performed.
[0111]Based on the component amounts listed in Table 4, slurries were prepared using varying amounts of sorbitol and sodium benzoate to study the biological effects during the aging period. The Silica Wet Cake 1 (WC1) was initially aged for about 1.5 weeks before the addition of sorbitol or sodium benzoate to allow bacterial growth. Sorbitol and sodium benzoate were placed in a 1200 ml stainless steel beaker and a Dispermat high speed mixer was placed in the beaker. The mixer was set at low speed when the desired amount of aged silica wet cake was added. After that, the speed of the mixer was increased to 6000 rpm and the slurry was mixed for 10 minutes. Each batch was divided into two equal aliquots and transferred to 250 ml sterile containers for 1 week and 3 week trials, respectively. After the in...
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Abstract
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