A method of preparing an aramid paper coated with aramid nanofibers includes the following steps: (1) mixing a meta-aramid fibrid slurry and a chopped meta-aramid fiber slurry, filtering, pressing and drying to obtain a meta-aramid paper; (2) mixing potassium hydroxide, deionized water, dimethyl sulfoxide, and para-aramid nanofibers in a container, and stirring to obtain a para-aramid nanofiber coating solution; and (3) applying the para-aramid nanofiber coating solution to a first side of the meta-aramid paper, washing with deionized water, and drying; applying the para-aramid nanofiber coating solution to a second side of the meta-aramid paper, washing with deionized water, and drying; and hot pressing to obtain the aramid paper coated with aramid nanofibers.

A method for the production of a fibrous product from a fibrous web, wherein the method comprises the steps of: —providing a fibrous suspension comprising a microfibrillated cellulose, wherein the content of the microfibrillated cellulose of said suspension is in the range of 60 to 99.9 weight-% based on total dry solid content, —adding an uncharged, amphoteric or weakly cationic polymer having a molecular weight of at least 50000 g/mol to said suspension, —adding an anionic polymer having a molecular weight of at least 00000 g/mol to said suspension to provide a mixture of said microfibrillated cellulose, said uncharged, amphoteric or weakly cationic polymer and said anionic polymer, 1—providing said mixture to a substrate to form a fibrous web, wherein the amount of uncharged, amphoteric or weakly cationic polymer in said mixture is in the range of 0.1 to 20 kg/metric ton based on total dry solid content and wherein the amount of anionic polymer in said mixture is in the range of 0.01 to 10 kg/metric ton based on total dry 20 solid content; and—dewatering said fibrous web to form a fibrous product.

A method for the production of a fibrous product from a fibrous web, wherein the method comprises the steps of: —providing a fibrous suspension comprising a microfibrillated cellulose, wherein the content of the microfibrillated cellulose of said suspension is in the range of 60 to 99.9 weight-% based on total dry solid content, —adding an uncharged, amphoteric or weakly cationic polymer having a molecular weight of at least 50000 g/mol to said suspension, —adding an anionic polymer having a molecular weight of at least 00000 g/mol to said suspension to provide a mixture of said microfibrillated cellulose, said uncharged, amphoteric or weakly cationic polymer and said anionic polymer, 1—providing said mixture to a substrate to form a fibrous web, wherein the amount of uncharged, amphoteric or weakly cationic polymer in said mixture is in the range of 0.1 to 20 kg/metric ton based on total dry solid content and wherein the amount of anionic polymer in said mixture is in the range of 0.01 to 10 kg/metric ton based on total dry 20 solid content; and—dewatering said fibrous web to form a fibrous product.

The polymerization stability and the chemical stability and the water resistance of resin films are improved. A surfactant composition according to an embodiment contains a surfactant (A) represented by general formula (1) and an anionic surfactant (B) having a hydrophobic group different from that of the surfactant (A). R.sup.1 represents an alkyl group with 8 to 14 carbon atoms, A represents an alkylene group with 2 to 4 carbon atoms, and n representing an average number of moles of an oxyalkylene group added represents 1 to 100. ##STR00001##

The polymerization stability and the chemical stability and the water resistance of resin films are improved. A surfactant composition according to an embodiment contains a surfactant (A) represented by general formula (1) and an anionic surfactant (B) having a hydrophobic group different from that of the surfactant (A). R.sup.1 represents an alkyl group with 8 to 14 carbon atoms, A represents an alkylene group with 2 to 4 carbon atoms, and n representing an average number of moles of an oxyalkylene group added represents 1 to 100. ##STR00001##

The present invention relates a process and a system for the point-of-use dilution of microfibrillated cellulose (MFC) from a higher solids content to a lower solids content, for example from a solids content in the range of 5% weight by weight (w/w)-50% w/w, preferably 5% w/w-30% w/w, further preferably 5% w/w-15% w/w, down to a solids content of below 7% w/w, preferably below 5% w/w, preferably to a solids content of 0.01% w/w-5% w/w, further preferably to a solids content of 0.1% w/w-3% w/w. The process at least comprises the following steps: (i) providing microfibrillated cellulose in a solvent, wherein the solids content is in the range of 5% weight by weight (w/w)-50% w/w, preferably 5% w/w-30% w/w, further preferably 5 w/w-15% w/w; (ii) subjecting said microfibrillated cellulose from step (i) to a dilution step in a rotor-stator mixer; (iii) simultaneously to step (ii): injecting solvent into the rotor-stator mixer, or into a volume segment upstream of the rotor-stator mixer, in order to lower the solids content of the microfibrillated cellulose in the rotor-stator mixer.

The present invention relates a process and a system for the point-of-use dilution of microfibrillated cellulose (MFC) from a higher solids content to a lower solids content, for example from a solids content in the range of 5% weight by weight (w/w)-50% w/w, preferably 5% w/w-30% w/w, further preferably 5% w/w-15% w/w, down to a solids content of below 7% w/w, preferably below 5% w/w, preferably to a solids content of 0.01% w/w-5% w/w, further preferably to a solids content of 0.1% w/w-3% w/w. The process at least comprises the following steps: (i) providing microfibrillated cellulose in a solvent, wherein the solids content is in the range of 5% weight by weight (w/w)-50% w/w, preferably 5% w/w-30% w/w, further preferably 5 w/w-15% w/w; (ii) subjecting said microfibrillated cellulose from step (i) to a dilution step in a rotor-stator mixer; (iii) simultaneously to step (ii): injecting solvent into the rotor-stator mixer, or into a volume segment upstream of the rotor-stator mixer, in order to lower the solids content of the microfibrillated cellulose in the rotor-stator mixer.

A high-strength network structured nano-carrier material and a preparation method and application thereof. A nano-cellulose solution and graphene are mixed and ultrasonication is performed in an ultrasonic pulverizer to obtain a nano-cellulose/graphene suspension. The suspension with a phenolic resin adhesive is mixed and stirred to obtain a nano-cellulose/graphene/phenolic resin suspension. The nano-cellulose/graphene/phenolic resin suspension is injected into a mold. The mold is placed in a freeze dryer for freezing and vacuum dried in two stages to obtain a nano-cellulose/graphene/phenolic resin aerogel. The aerogel is preheated and cured in a muffle furnace, then subjected to a high-temperature thermal decomposition treatment in a tube furnace to obtain a nano-carrier material having a high-strength network structure. The preparation method is simple and convenient, low in cost, environmentally friendly and green. The obtained carrier material has a good water resistance and a high mechanical property, and can carry more active substances.

A high-strength network structured nano-carrier material and a preparation method and application thereof. A nano-cellulose solution and graphene are mixed and ultrasonication is performed in an ultrasonic pulverizer to obtain a nano-cellulose/graphene suspension. The suspension with a phenolic resin adhesive is mixed and stirred to obtain a nano-cellulose/graphene/phenolic resin suspension. The nano-cellulose/graphene/phenolic resin suspension is injected into a mold. The mold is placed in a freeze dryer for freezing and vacuum dried in two stages to obtain a nano-cellulose/graphene/phenolic resin aerogel. The aerogel is preheated and cured in a muffle furnace, then subjected to a high-temperature thermal decomposition treatment in a tube furnace to obtain a nano-carrier material having a high-strength network structure. The preparation method is simple and convenient, low in cost, environmentally friendly and green. The obtained carrier material has a good water resistance and a high mechanical property, and can carry more active substances.

The present invention relates a process and a system for the point-of-use dilution of microfibrillated cellulose (MFC) from a higher solids content to a lower solids content, for example from a solids content in the range of 5% weight by weight (w/w)-50% w/w, preferably 5% w/w-30% w/w, further preferably 5% w/w-15% w/w, down to a solids content of below 7% w/w, preferably below 5% w/w, preferably to a solids content of 0.01% w/w-5% w/w, further preferably to a solids content of 0.1% w/w-3% w/w. The process at least comprises the following steps: (i) providing microfibrillated cellulose in a solvent, wherein the solids content is in the range of 5% weight by weight (w/w)-50% w/w, preferably 5% w/w-30% w/w, further preferably 5 w/w-15% w/w; (ii) subjecting said microfibrillated cellulose from step (i) to a dilution step in a rotor-stator mixer; (iii) simultaneously to step (ii): injecting solvent into the rotor-stator mixer, or into a volume segment upstream of the rotor-stator mixer, in order to lower the solids content of the microfibrillated cellulose in the rotor-stator mixer.