Biodegradable solid particle emulsifier and papermaking sizing agent
A technology of solid particles and emulsifiers, applied in the directions of dissolution, addition of water repellents, chemical instruments and methods, etc., can solve the problems of large amount of particle components, low concentration of ASA emulsion, unfavorable emulsion storage, etc., and achieve high stability. , The effect of low emulsification cost and low dosage
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Embodiment 1
[0030] Preparation of biodegradable solid particle emulsifiers (CPs): hydrolyze microcrystalline cellulose with 64% sulfuric acid solution at 45°C and 100 rpm magnetic stirring for 30 minutes, then centrifuge and wash to remove the remaining acid solution , and then through dialysis and ultrasonic treatment to obtain cellulose nanocrystal columnar particles. The cellulose nanocrystals with a length of 10-500nm and a width of 1-50nm are prepared with deionized water to form a cellulose nanocrystal solution with a mass fraction of 2%.
[0031]Dissolving polylactic acid-glycolic acid copolymer with a molecular weight of 92000-110000g / mol and an intrinsic viscosity of 0.9-1.3dL / g in chloroform to prepare a polylactic acid-glycolic acid copolymer-chloroform solution with a mass fraction of 5%; The polylactic acid-glycolic acid copolymer-chloroform solution was magnetically stirred for 2 hours, then mixed with water at a volume ratio of 1:1, and sheared and stirred for 15 minutes to...
Embodiment 2
[0035] The cellulose nanocrystals with a length of 10-500nm and a width of 1-50nm are prepared with deionized water to form a cellulose nanocrystal solution with a mass fraction of 2%.
[0036] The molecular weight is 92000-110000g / mol, the polylactic acid-glycolic acid copolymer that intrinsic viscosity is 0.9-1.3dL / g is dissolved in chloroform, is made into the polylactic acid-glycolic acid copolymer-chloroform solution that mass fraction is 3%, After magnetically stirring for 2 hours, mix with water at a volume ratio of 5:2, and shear and stir for 15 minutes to obtain a mixed liquid of polylactic acid-glycolic acid copolymer-chloroform-water, and to the obtained polylactic acid-glycolic acid copolymer- The chloroform-water mixed liquid is added with a mass fraction of 2% cellulose nanocrystal aqueous solution, wherein the volume ratio of the polylactic acid-glycolic acid copolymer-chloroform-water mixed liquid to the cellulose nanocrystal aqueous solution is 7:20, ultrasonic...
Embodiment 3
[0040] The cellulose nanocrystals with a length of 10-500nm and a width of 1-50nm are prepared with deionized water to form a cellulose nanocrystal solution with a mass fraction of 2%.
[0041] The molecular weight is 92000-110000g / mol, the polylactic acid-glycolic acid copolymer that intrinsic viscosity is 0.9-1.3dL / g is dissolved in chloroform, is made into the polylactic acid-glycolic acid copolymer-chloroform solution that mass fraction is 7%, After magnetic stirring for 2 hours, mix with water at a volume ratio of 5:1, and shear and stir for 15 minutes to obtain a mixed liquid of polylactic acid-glycolic acid copolymer-chloroform-water, and to the obtained polylactic acid-glycolic acid copolymer- The chloroform-water mixed liquid is added with a mass fraction of 2% cellulose nanocrystal aqueous solution, wherein the volume ratio of the polylactic acid-glycolic acid copolymer-chloroform-water mixed liquid to the cellulose nanocrystal aqueous solution is 7:20, ultrasonic vib...
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