Substituted cellulose acetates and uses thereof
A technology of cellulose acetate and cellulose, which is applied in applications, tobacco, and e-liquid filter elements, etc., and can solve problems such as the lack of thorough research on the properties of cellulose acetate derivatives
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Embodiment 1
[0116] The adhesive properties of some adhesive compositions comprising the substituted cellulose acetates of the present invention were tested on a variety of substrates including wood and paperboard using the lap shear test. Comparing these results with commercially available glue solutions (for example, ELMER's glue solution )Compare. A summary of the results is shown in Tables 1A and 1B below.
[0117] Table 1A. Lap Shear Test Results
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[0120] Table IB. Lap Shear Test Results
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[0123]Substituted cellulose acetates having a high sulfur content according to one or more embodiments of the present invention (Lots 1-5 of cellulose acetate binder) were prepared and utilized (Model 3366) Lap Shear Test This is tested as a wood adhesive. The results including the amount of sulfur in the solution (mg sulfur / kg sulfur) are summarized in Tables 1A and 1B above. 2 small wooden blocks were glued together using a 10% aqueous solutio...
Embodiment 2
[0126] This example describes the synthesis of sulfate-substituted cellulose acetates of the invention. In the first step, cellulose is acetylated in the presence of acetic anhydride and sulfuric acid. Cellulose, acetic acid, acetic anhydride, and sulfuric acid were prepared similarly to the production of standard di-cellulose acetate diacetate. Next, the reactants are combined to initiate the acetylation reaction. The reaction is allowed to reach completion and any excess anhydride is then reacted by adding water. Reaction rates and temperatures can be closely monitored and varied to control certain polymer properties.
[0127] Next, acetylated cellulose (ie, cellulose acetate) is hydrolyzed in the presence of acetic acid without precipitation and subsequent redissolution steps. This reduces cellulose acetate to target acetate DS levels by carefully controlling reaction temperature and time. Water was added as needed to maintain polymer solubility. This produces a sulfat...
Embodiment 3
[0130] In this example, water-swellable cellulose acetate (low sulfur content) and substituted cellulose acetate (high sulfur content) were tested for their water absorption capacity using thermogravimetric analysis (TGA). Each sample was placed in a TGA system and subjected to the following temperatures. The sample was heated to 110°C at 20°C / min. The temperature was maintained at 110°C for 30 minutes. The temperature was then raised to 650°C at 20°C / min. The sample gas was then switched to air and the temperature was maintained at 650°C for 30 minutes. Cellulose acetate samples were limited to less than 100 mg in each test run.
[0131] Figure 2-5 Multiple TGA analytical runs measuring the water absorption of high and low sulfate substituted cellulose acetates are shown.
[0132] figure 2 TGA analysis of water-saturated, water-swellable cellulose acetate (WSCA) 1036RT-16 dried samples is shown. WSCA 1036 RT-16 is a high sulfate substituted cellulose acetate particle...
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