Porous color cellulose particle and its preparing method
A cellulose and particle technology, which is applied in the field of porous colored cellulose particles and preparation technology to achieve the effects of avoiding release, reducing the content of harmful substances, and avoiding the use of organic solvents
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specific Embodiment approach 1
[0010] Embodiment 1: In this embodiment, porous colored cellulose particles are prepared according to the following method:
[0011] a. Dissolve the low-molecular-weight cellulose pulp after beating and centrifugal drying in the mixed aqueous solution at -18~-0°C, soak for a while, wait for the solution to fully infiltrate the pulp, and stir at room temperature until a transparent polymer colloid is obtained solution.
[0012] b. Add dyes to the polymer solution, stir to disperse evenly, then add foaming agent, and foam at low temperature to obtain a uniformly colored microbubble polymer solution system.
[0013] Oil-soluble dyes must be emulsified for more than 3 hours in advance, so that the organic dyes can be better dispersed in it and form a uniform system. Add quantitatively to the filtered sol system to adjust to a suitable color depth, and stir well to make the pigment evenly dispersed. Under the condition of stirring, the water bath is heated to 20-30 ℃, and the pur...
specific Embodiment approach 2
[0023] Embodiment 2: Add 691g of urea, 38g of thiourea, 691g of sodium hydroxide and 7.5g of diethanolamine into a 10-liter stainless steel reactor containing 5572g of water to dissolve, and freeze to -12°C. Then add the cellulose with a degree of polymerization of 700 into the frozen solution and stir to dissolve after beating. And continue to heat up to room temperature, filter with a 100-mesh gauze to make a transparent polymer concentrated solution. Add 0.1g of phthalocyanine blue to the polymer solution and stir to disperse evenly, then add 130g of azodicarbonamide foaming agent to foam at 25°C to obtain a blue uniform microbubble polymer solution system. The polymer solution was centrifuged to form droplets by means of rotating droplets, and solidified in 2% hydrochloric acid aqueous solution to produce fluffy cellulose particles. After washing three times with water, centrifuging and drying at 105°C for 10 hours, porous blue cellulose particles were obtained. Porous b...
specific Embodiment approach 3
[0024] Embodiment 3: Add 600 g of urea, 108 g of thiourea, 700 g of sodium hydroxide and 5 g of ethylene glycol into a 10-liter stainless steel reactor filled with 5587 g of water to dissolve, and freeze to -10°C. Then add 290 g of cellulose with a degree of polymerization of 600 into the frozen solution and stir to dissolve after beating. And continue to heat up to room temperature, filter with a 100-mesh gauze to make a transparent polymer concentrated solution. Add 0.1g of macromolecular red dye to the polymer solution, stir and disperse evenly, then add 120g of azodicarbonamide foaming agent to foam at 40°C to obtain a red uniform microbubble polymer solution system. The polymer solution was centrifuged to form droplets by means of rotating droplets, and solidified in 5% sulfuric acid aqueous solution to produce fluffy cellulose particles. After washing three times with water, centrifuging and drying at 105°C for 10 hours, porous red cellulose particles were obtained. Po...
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