Ecological cationic surface sizing enhancer for papermaking and preparation method thereof
A surface sizing agent and surface sizing technology, which is applied in the direction of adding reinforcing agent and water-repellent agent, can solve the problems of insufficient water resistance of cellulose nanocrystals, failure to achieve industrial application, high residual monomer and solvent content, etc. Achieve good surface sizing ability, excellent surface strength, and improve surface strength
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Embodiment 1
[0031] The massfraction 5% cellulose nano whisker suspension that measures 200ml is poured in the round bottom flask, by mol (K 2 S 2 O4) / mol (cellulose nano-whiskers)=1:50, add potassium persulfate, and react for 2.5h under the condition of 50°C and uniform stirring at a temperature, and use 0.1mol / l sodium hydroxide solution in the reaction process Add dropwise to control the pH=6.5, then add 50ml of ethylene glycol, continue to react for 0.5h, collect the fully reacted mixed solution and dialyze with running water for 2d, and obtain a 5% suspension by rotary evaporation.
[0032] Get 350ml above-mentioned suspension and pour in the reactor, in mol (K 2 S 2 o 4 ) / mol(CTA)=1:2, add the corresponding amount of CTA, adjust the pH with potassium carbonate to pH=6.5, stir and react for 5h, the reaction temperature is 55°C; place the fully reacted suspension in a dialysis bag After dialysis in medium running water for 2 days, a cationic cellulose nanowhisker suspension with a ...
Embodiment 2
[0034] Get the dimethylsulfoxide (DMSO) of 95ml and the 5% cellulose nano-whisker sol of 50g, DMSO is directly added in the cellulose nano-whisker sol, then under the condition of slow stirring, by mol (H 2 0 2 ) / mol (cellulose nano-whiskers)=1:20, add hydrogen peroxide, react at a temperature of 50° C. and uniformly stir for 2.5 hours, and pour the solution into 200ml of 95% ethanol to terminate the reaction. Then add 0.125g of NaOH solid, put the solution into a constant temperature water bath at 50°C, and then slowly add 0.5g of cationic etherification agent 2,3-epoxypropyltrimethylammonium chloride (EPTMAC) into the reaction In the system, it was taken out every 1.5 h during the reaction period and ultrasonically cleaned for 0.5 h. The conditions of ultrasonic cleaning were 60° C. and the power was 100%, after 6 h of reaction. The prepared suspension was subjected to centrifugation and dialysis, and after dialysis, it was concentrated by rotary evaporation to obtain a cat...
Embodiment 3
[0036] The massfraction 5% cellulose nano whisker suspension that measures 200ml is poured in the round bottom flask, by mol (H 2 0 2 ) / mol (cellulose nano-whiskers) = 1:30, add hydrogen peroxide, and react for 2.5 hours at a temperature of 50°C with uniform stirring. During the reaction, add 0.1mol / l sodium carbonate solution dropwise to control the pH = 6.0, then add 50ml of glycerol, continue to react for 0.5h, collect the fully reacted mixed solution and dialyze with running water for 2d, and obtain a suspension with a mass fraction of 5% by rotary evaporation.
[0037] Get 350ml above-mentioned suspension and pour in the reactor, with mol (H 2 0 2 ) / mol(EPTMAC)=1:1 ratio, add the corresponding amount of EPTMAC, adjust the pH with diethanolamine to pH=6.5, stir and react for 5h, the reaction temperature is 55°C; put the fully reacted suspension in a dialysis bag After dialysis in medium running water for 2 days, a 5% cationic cellulose nanowhisker suspension was finally...
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