The invention provides protein adhesives, and methods of making and using such adhesives. The protein adhesives contain a protein-bonding agent and plant protein composition, such as an isolated water-soluble protein fraction or ground plant meal obtained from plant biomass. The protein-bonding agent can be an anhydride compound, carboxylic acid compound, carboxylate salt compound, or combinations thereof. The protein adhesives are useful in bonding together lignocellulosic materials and other types of materials.

A preparation method of tea residue fiber raw materials includes steps of (1) sun-drying tea residues, crushing the sun dried tea residues, and treating them with concentrated hydrochloric acid and a strong base in succession; (2) extracting water from the treated tea residues to obtain tea polyphenols and pulp respectively, cooking the pulp, and then pressing and dehydrating it to obtain coarse pulp; (3) sequentially grinding and sieving the pulp, and beating it; and (4) adding -cyclodextrin, carboxymethylcellulose sodium, and reinforced starch after the beating, adjusting the pH to 7-8, diluting, adding the tea polyphenols obtained in the second step, stirring uniformly, pressing and dehydrating, and drying to obtain the tea residue fiber raw material.

A preparation method of tea residue fiber raw materials includes steps of (1) sun-drying tea residues, crushing the sun dried tea residues, and treating them with concentrated hydrochloric acid and a strong base in succession; (2) extracting water from the treated tea residues to obtain tea polyphenols and pulp respectively, cooking the pulp, and then pressing and dehydrating it to obtain coarse pulp; (3) sequentially grinding and sieving the pulp, and beating it; and (4) adding -cyclodextrin, carboxymethylcellulose sodium, and reinforced starch after the beating, adjusting the pH to 7-8, diluting, adding the tea polyphenols obtained in the second step, stirring uniformly, pressing and dehydrating, and drying to obtain the tea residue fiber raw material.

A bio-based environment-friendly flame retardant wallpaper and a preparation method thereof, including: selecting alginate fibre to be mixed with wood pulp, beating to obtain mixed size, adding dispersant and performing paper-making and drying to obtain raw paper; sequentially coating the surface of the raw paper with alginate colloid, PVC, calcium carbonate and DOP paste; performing drying, cooling, printing, and cutting into the required specification to obtain the wallpaper. The chopped alginate fibre is used as paper pulp fiber, and the catalytic cracking effect is realized by metal ions in the fibre to reduce the production of flammable gases, form an alkaline environment, produce CO.sub.2, dilute the flammable gases, form a solid-state barrier of metal oxides and carbonates on the surface of the fiber and achieve the flame retardant effects of little smoke, no melt drops and the like. The flame retardant oxygen index of the wallpaper is more than 30%.

A bio-based environment-friendly flame retardant wallpaper and a preparation method thereof, including: selecting alginate fibre to be mixed with wood pulp, beating to obtain mixed size, adding dispersant and performing paper-making and drying to obtain raw paper; sequentially coating the surface of the raw paper with alginate colloid, PVC, calcium carbonate and DOP paste; performing drying, cooling, printing, and cutting into the required specification to obtain the wallpaper. The chopped alginate fibre is used as paper pulp fiber, and the catalytic cracking effect is realized by metal ions in the fibre to reduce the production of flammable gases, form an alkaline environment, produce CO.sub.2, dilute the flammable gases, form a solid-state barrier of metal oxides and carbonates on the surface of the fiber and achieve the flame retardant effects of little smoke, no melt drops and the like. The flame retardant oxygen index of the wallpaper is more than 30%.

A food packaging material comprises a paper, paperboard or cardboard substrate and a barrier coating on the substrate, wherein the barrier coating comprises the combination of starch, seaweed extract and paper fibers.

A food packaging material comprises a paper, paperboard or cardboard substrate and a barrier coating on the substrate, wherein the barrier coating comprises the combination of starch, seaweed extract and paper fibers.

The invention provides protein adhesives, and methods of making and using such adhesives. The protein adhesives contain a protein-bonding agent and plant protein composition, such as an isolated water-soluble protein fraction or ground plant meal obtained from plant biomass. The protein-bonding agent can be an anhydride compound, carboxylic acid compound, carboxylate salt compound, or combinations thereof. The protein adhesives are useful in bonding together lignocellulosic materials and other types of materials.

The invention provides protein adhesives, and methods of making and using such adhesives. The protein adhesives contain a protein-bonding agent and plant protein composition, such as an isolated water-soluble protein fraction or ground plant meal obtained from plant biomass. The protein-bonding agent can be an anhydride compound, carboxylic acid compound, carboxylate salt compound, or combinations thereof. The protein adhesives are useful in bonding together lignocellulosic materials and other types of materials.

The present invention relates generally to compositions comprising polyelectrolytes complexes (PECs) of anionic and cationic biopolymers capable of forming barriers on fiber based materials. Also disclosed is a fibre based material with a barrier coating against oil and water, wherein the material is provided with a barrier from at least two layers formed from at least one composition comprising a polyelectrolyte complex (PEC) of a cationic biopolymer and an anionic biopolymer, The two layers result in improvements in both oil resistance and water resistance compared to the same material provided with a single layer of said at least one composition.