Method for preparing polylactic acid composite material by modifying papermaking white mud
A technology for papermaking lime mud and composite materials, which is applied in the field of preparing polylactic acid composite materials by modification of papermaking lime mud, can solve problems such as environmental pollution and resource waste, and achieve the effect of solving resource waste and realizing sustainable recycling.
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example 1
[0017] First collect papermaking white mud, mix it with 1mol / L hydrochloric acid solution according to the solid-to-liquid mass ratio of 1:10, and place it under 200W for 10 minutes of ultrasonic oscillation, then soak for 2 hours, and filter it after soaking is completed. Collect the filter cake, and then according to the solid-liquid mass ratio of 1:10, stir and mix the filter cake with 20% sodium hydroxide solution and let it settle, filter and collect the filter cake again, wash with deionized water until the pH reaches 7.0 , and placed in a 60°C oven to dry for 6 hours to obtain the washed and dried lime mud; then put the washed and dried lime mud in a tube furnace and heat it, setting the heating rate to 10°C / min. When the temperature rises to 200°C, stop heating. After heat preservation and calcination for 3 hours, slowly heat up to 400°C at a rate of 2°C / min, then calcine at a constant temperature for 2 hours, then slowly heat up to 600°C at a rate of 10°C / min, and heat...
example 2
[0020]First collect papermaking white mud, mix it with 1mol / L hydrochloric acid solution according to the solid-to-liquid mass ratio of 1:10, and place it under 250W for 13 minutes of ultrasonic oscillation, then soak it for 2.5 hours, and filter it after soaking , collect the filter cake, and then according to the solid-to-liquid mass ratio of 1:10, the filter cake and the sodium hydroxide solution with a mass concentration of 20% are stirred and mixed and allowed to stand for precipitation, and the filter cake is collected again by filtration, washed with deionized water until the pH is up to 7.0, and placed in a 70°C oven to dry for 7 hours to obtain the washed and dried lime mud; then place the washed and dried lime mud in a tube furnace and heat it, setting the heating rate to 10°C / min, When the temperature rises to 225°C, stop heating. After 4 hours of heat preservation and calcination, slowly raise the temperature to 425°C at a rate of 2°C / min, then calcine at a constant...
example 3
[0023] First collect papermaking white mud, mix it with 1mol / L hydrochloric acid solution according to the solid-to-liquid mass ratio of 1:10, and place it under 300W for ultrasonic oscillation for 15 minutes, then soak for 3 hours, and filter it after soaking is completed. Collect the filter cake, and then according to the solid-liquid mass ratio of 1:10, stir and mix the filter cake with 20% sodium hydroxide solution and let it settle, filter and collect the filter cake again, wash with deionized water until the pH reaches 7.0 , and placed in an oven at 80°C for 8 hours to obtain washed and dried lime mud; then put the washed and dried lime mud in a tube furnace and heat it, setting the heating rate to 10°C / min, and then When the temperature rises to 250°C, stop heating. After heat preservation and calcination for 5 hours, slowly heat up to 450°C at a rate of 2°C / min, then calcine at a constant temperature for 3 hours, then slowly heat up to 650°C at a rate of 10°C / min, and h...
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