Preparation method and application of nano lignin latex

Abstract

The invention discloses a preparation method and application of nano lignin latex, and the preparation method of the nano lignin latex comprises the following steps: (1) mixing acid precipitation lignin with a surfactant to obtain nano lignin; and (2) mixing the nano lignin with rubber latex to obtain the nano lignin latex. According to the invention, the surfactant is added into the acid precipitation lignin to maintain the long-term particle size stability of the acid precipitation lignin, the nano lignin is prepared, and then the nano lignin is filled into the rubber, so that the mechanical properties of the rubber can be effectively improved. According to the invention, the wet mixing method is directly used for rubber mixing, the hydrogen-bond interaction exists between lignin precipitated from the black liquor and water molecules, and the surfactant can reduce the agglomeration of the lignin in the mixing process, so that a good dispersion effect is achieved. The method is simple in equipment, short in technological process, convenient to operate and optimistic in industrial production prospect.

Description

technical field

[0001] The invention belongs to the technical field of nanometer material application, and in particular relates to a preparation method and application of nanometer lignin latex. Background technique

[0002] Lignin is the largest aromatic polymer in nature. It has a three-dimensional network structure. It has good thermal stability, corrosion resistance and mechanical properties. It is rich in sources, low in price, renewable and degradable. Papermaking wastewater accounts for 30% of the national industrial wastewater volume, and the lignin in the waste liquid discharged from every ton of paper produced is close to 0.5 tons. Therefore, whether it is from the perspective of environmental protection or resource utilization, the separation and recovery of lignin has reached a consensus in all sectors of society. Acidification method to extract lignin is still a commonly used method at present, but the lignin extracted by acid precipitation method is very easy...

Examples

Embodiment 1

[0045] (1) Heat the papermaking black liquor to 60°C, add 98% concentrated sulfuric acid to adjust the pH to 1.5 during stirring at 450r / min, filter, and dry to obtain acid-analyzed lignin.

[0046] (2) Add 1 wt% detergent to the acid-analyzed lignin obtained in step (1) to obtain nano-lignin.

[0047] (3) First get 100g of 20% styrene-butadiene rubber latex and add it to a three-necked flask, add 5g of nano lignin obtained in step (2), carry out a mixing process at about 700r / min for 10min with mechanical stirring, and mix lignin with styrene-butadiene latex Finished, namely get the lignin latex mixture.

[0048] (4) Configure about 600mL of 1% hydrochloric acid as a flocculant, stir the flocculant with mechanical stirring at about 200-300r / min, and slowly pour the lignin latex mixture obtained in step (3) into the flocculant, and the wood to be mixed Put the plain latex mixture into the bag after flocculation for later use.

[0049] (5) Chop or slice the flocculated flocs ...

Embodiment 2

[0053] (1) Heat the papermaking black liquor to 60°C, add 98% concentrated sulfuric acid to adjust the pH to 1.5 during stirring at 450r / min, filter, and dry to obtain acid-analyzed lignin.

[0054] (2) Add 1 wt% detergent to the acid-analyzed lignin obtained in step (1) to obtain nano-lignin.

[0055] (3) First get 100g of 20% styrene-butadiene rubber latex and add it to a three-necked flask, add 10g of nano-lignin obtained in step (2), carry out a mixing process at about 700r / min for 10min with mechanical stirring, and mix lignin with styrene-butadiene latex Finished, namely get the lignin latex mixture.

[0056] (4) Configure about 600mL of 1% hydrochloric acid as a flocculant, stir the flocculant with mechanical stirring at about 200-300r / min, slowly pour the lignin latex mixture obtained in step (3) into the flocculant, and the wood to be mixed Put the plain latex mixture into the bag after flocculation for later use.

[0057] (5) Chop or slice the flocculated flocs wit...

Embodiment 3

[0061] (1) Heat the papermaking black liquor to 60°C, add 98% concentrated sulfuric acid to adjust the pH to 1.5 during stirring at 450r / min, filter, and dry to obtain acid-analyzed lignin.

[0062] (2) Add 1 wt% detergent to the acid-analyzed lignin obtained in step (1) to obtain nano-lignin.

[0063] (3) First get 100g of 20% styrene-butadiene rubber latex and add it to a three-necked flask, add 15g of nano lignin obtained in step (2), carry out a mixing process at about 700r / min for 10min with mechanical stirring, and mix lignin with styrene-butadiene latex Finished, namely get the lignin latex mixture.

[0064] (4) Configure about 600mL of 1% hydrochloric acid as a flocculant, stir the flocculant with mechanical stirring at about 200-300r / min, slowly pour the lignin latex mixture obtained in step (3) into the flocculant, and the wood to be mixed Put the plain latex mixture into the bag after flocculation for later use.

[0065] (5) Chop or slice the flocculated flocs wit...

technical field

[0001] The invention belongs to the technical field of nanometer material application, and in particular relates to a preparation method and application of nanometer lignin latex. Background technique

[0002] Lignin is the largest aromatic polymer in nature. It has a three-dimensional network structure. It has good thermal stability, corrosion resistance and mechanical properties. It is rich in sources, low in price, renewable and degradable. Papermaking wastewater accounts for 30% of the national industrial wastewater volume, and the lignin in the waste liquid discharged from every ton of paper produced is close to 0.5 tons. Therefore, whether it is from the perspective of environmental protection or resource utilization, the separation and recovery of lignin has reached a consensus in all sectors of society. Acidification method to extract lignin is still a commonly used method at present, but the lignin extracted by acid precipitation method is very easy...

Examples

Embodiment 1

[0045] (1) Heat the papermaking black liquor to 60°C, add 98% concentrated sulfuric acid to adjust the pH to 1.5 during stirring at 450r / min, filter, and dry to obtain acid-analyzed lignin.

[0046] (2) Add 1 wt% detergent to the acid-analyzed lignin obtained in step (1) to obtain nano-lignin.

[0047] (3) First get 100g of 20% styrene-butadiene rubber latex and add it to a three-necked flask, add 5g of nano lignin obtained in step (2), carry out a mixing process at about 700r / min for 10min with mechanical stirring, and mix lignin with styrene-butadiene latex Finished, namely get the lignin latex mixture.

[0048] (4) Configure about 600mL of 1% hydrochloric acid as a flocculant, stir the flocculant with mechanical stirring at about 200-300r / min, and slowly pour the lignin latex mixture obtained in step (3) into the flocculant, and the wood to be mixed Put the plain latex mixture into the bag after flocculation for later use.

[0049] (5) Chop or slice the flocculated flocs ...

Embodiment 2

[0053] (1) Heat the papermaking black liquor to 60°C, add 98% concentrated sulfuric acid to adjust the pH to 1.5 during stirring at 450r / min, filter, and dry to obtain acid-analyzed lignin.

[0054] (2) Add 1 wt% detergent to the acid-analyzed lignin obtained in step (1) to obtain nano-lignin.

[0055] (3) First get 100g of 20% styrene-butadiene rubber latex and add it to a three-necked flask, add 10g of nano-lignin obtained in step (2), carry out a mixing process at about 700r / min for 10min with mechanical stirring, and mix lignin with styrene-butadiene latex Finished, namely get the lignin latex mixture.

[0056] (4) Configure about 600mL of 1% hydrochloric acid as a flocculant, stir the flocculant with mechanical stirring at about 200-300r / min, slowly pour the lignin latex mixture obtained in step (3) into the flocculant, and the wood to be mixed Put the plain latex mixture into the bag after flocculation for later use.

[0057] (5) Chop or slice the flocculated flocs wit...

Embodiment 3

[0061] (1) Heat the papermaking black liquor to 60°C, add 98% concentrated sulfuric acid to adjust the pH to 1.5 during stirring at 450r / min, filter, and dry to obtain acid-analyzed lignin.

[0062] (2) Add 1 wt% detergent to the acid-analyzed lignin obtained in step (1) to obtain nano-lignin.

[0063] (3) First get 100g of 20% styrene-butadiene rubber latex and add it to a three-necked flask, add 15g of nano lignin obtained in step (2), carry out a mixing process at about 700r / min for 10min with mechanical stirring, and mix lignin with styrene-butadiene latex Finished, namely get the lignin latex mixture.

[0064] (4) Configure about 600mL of 1% hydrochloric acid as a flocculant, stir the flocculant with mechanical stirring at about 200-300r / min, slowly pour the lignin latex mixture obtained in step (3) into the flocculant, and the wood to be mixed Put the plain latex mixture into the bag after flocculation for later use.

[0065] (5) Chop or slice the flocculated flocs wit...

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