15results about "Lignocellulosic adhesives" patented technology

This disclosure provides formulations and processes that reduce the injection molding cycle times for poly(hydroxyalkanoate) blends which may contain a succinate polymer such as poly(butylene succinate), a filler such as lignocellulosic biomass and other additives. Blending of PHA with the second polymer may increase biodegradability and compostability.

The invention relates to moisture-proof plywood and a preparation method thereof, and belongs to the technical field of plywood processing.The moisture-proof plywood is obtained by gluing three layers of veneers through an adhesive, and the fiber directions of the adjacent layers of veneers are perpendicular to each other; the adhesive is composed of a liquid adhesive and a filling agent; wherein the liquid glue is prepared from the following raw materials in parts by weight: 40 to 45 parts of isocyanate, 6 to 12 parts of dioctyl phthalate, 3 to 6 parts of triethyl orthoformate, 12 to 16 parts of epoxidized soybean oil and 1 to 3 parts of polydimethylsiloxane; the filling agent is prepared from the following raw materials in parts by weight: 35-55 parts of wood flour, 10-20 parts of calcium carbonate, 30-35 parts of aluminum stearate and 5-10 parts of carbon nanotubes. The fiber directions of the adjacent layers of veneers are perpendicular to each other, the veneers can be prevented from being broken in the fiber directions, the adhesive is prepared in the mode that the liquid adhesive and the filler are combined, the filler provides a framework for the liquid adhesive, and the viscosity, the leveling property and other construction performance of the adhesive can be controlled.

____________ The present invention relates to a process for preparing a lignocellulosic-based article comprising resinating lignocellulosic material with an adhesive composition comprising a protein, an organic polycarboxylic acid compound, a non-aromatic polyol and water.

The application discloses a kind of ancient ship rotten wood protection repair method, for the pine, fir, camphor wood on ancient ship, after the oxidation-reduction reaction of iron and the oxidation of reduced state sulfur, cause the degradation and rotten of wood, with micro-nano lime and ethyl cellulose deacidification reinforcement;For the crack and incomplete parts of ancient ship, make into imitation wood grain paste with tung oil etc. and fill the vacancy;For broken wood block, make into rotten wood adhesive with tung oil etc. and bond;For the ancient ship protection after repair, use fluorine rubber as sealing agent, provide a good environment for cultural relics, achieve waterproof, mildewproof, insect prevention and other effects.The method of the application replaces the traditional polyethylene glycol penetration spray method, rosin paraffin hot infiltration method, polyvinyl alcohol, polyethylene glycol penetration reinforcement, spraying raw tung oil, raw lacquer, B72 and epoxy resin and other protection methods, and uses fluorine rubber as ancient ship sealing agent, achieves the purpose of traditional and modern material combination of cultural relic protection "repairing old as old, minimal intervention".

The present invention relates to lignocellulosic nanofibres (LNFC) or biopolymeric reinforcing nanoadditive as a mechanical reinforcement of low-molar-ratio phenol formaldehyde (PF) and urea formaldehyde (UF) thermosetting adhesives, wherein the use of natural nanocompounds based on lignin and cellulose makes the nanoadditive or nanofibre a "green" or environmentally friendly additive, said additive being useful in the production of wood-based composites. The LNFCs are made by means of a process that does not involve chemical additives and which is based on thermomechanical wood pulp, using microshredding and high-pressure microfluidsation. The present natural nanoadditive or natural reinforcement fibre is intended for the industry of manufacturing plywood, medium density fibreboard (MDF) and particleboard.

The invention belongs to the technical field of formaldehyde-free adhesives, and particularly relates to a formaldehyde-free adhesive based on a biomass material as well as a preparation method and application of the formaldehyde-free adhesive. The formaldehyde-free adhesive comprises the following raw material components in parts by mass: 50-80 parts of a biomass material, 5-20 parts of phenol, 5-15 parts of polyethylene glycol, 2-8 parts of polyol, 1-5 parts of citric acid, 2-10 parts of glyoxal and 3-8 parts of a cross-linking agent. According to the preparation method of the formaldehyde-free adhesive, phenol, polyethylene glycol and polyhydric alcohol are adopted and subjected to high-temperature treatment to generate bio-oil, then the bio-oil reacts with chemical substances such as citric acid and glyoxal, and the adhesive with a cross-linked structure is obtained; the adhesive can provide strong bonding strength on wood, straw, reed, bamboo wood and the like, and can adapt to different types of shaving board production processes.

The invention relates to the technical field of high polymer materials, and particularly discloses a preparation method of a low-VoC environment-friendly adhesive special for wallpaper and wall cloth. Comprising the following steps: S1, adding polyvinyl alcohol into deionized water to obtain a mixed solution; s2, hydroxypropyl distarch phosphate, wood fibers and deionized water are mixed, and mixed slurry is obtained; s3, mixing the mixed solution with the mixed slurry to obtain a prepolymer; s4, cooling the prepolymer, and sequentially adding auxiliaries to obtain a mixture; s5, adding a rosin ethanol solution and a defoaming agent into the mixture to obtain a crude product; and S6, carrying out vacuum defoaming treatment on the crude product, then sterilizing, cooling and discharging to obtain the adhesive. The adhesive disclosed by the invention can be used for adhering various pure paper, non-woven fabrics, diatom ooze and heavy wallpaper and wall cloth, and has the advantages of extremely low VOC content, environment friendliness, no peculiar smell, high initial adhesion and strong lasting viscosity.

According to the present invention, there is provided a method for the production of an adhesive, said method comprising the following steps: a) providing lignin rich carbohydrate complexes (LCC) by pressurized hot water extraction of softwood biomass, preferably biomass of Norway spruce or Scots pine, or of hardwood biomass, preferably biomass of Birch or Beech, providing bark lignin rich carbohydrate complexes (BLCC) by pressurized hot water extraction of softwood bark, preferably bark of Norway spruce or Scots pine, or providing liquefied biomass by acid-catalyzed liquefaction of biomass including wood saw dust, agricultural residues, plant stalks, recycle carton boards, recycle paper, recycle wood, wood panels, and wood bark side streams, in polyhydric alcohols and phenols; b) reacting the LCCs, BLCCs, or liquefied biomass obtained in step a) with a crosslinking or catalytic agent selected from the group consisting of: carboxylic agents including citric acid, dicarboxylic acids including adipic acid, organic acid anhydrides, tannin, tannic acid, plant derived fatty acids including suberin, and hexamethylenediamine, in order to produce said adhesive. The present invention is also directed to an adhesive produced by the method of the invention and to the use thereof as a bonding agent in wood products or as a coating agent in wood products or mineral wool.

The present invention relates to a process for preparing a lignocellulosic-based article comprising resinating lignocellulosic material with an adhesive composition comprising a protein, an organic polycarboxylic acid compound, a non-aromatic polyol and water.

The invention discloses a high-bonding-strength environment-friendly adhesive and a preparation method thereof, and the high-bonding-strength environment-friendly adhesive comprises the following components in parts by weight: 60-90 parts of composite viscous solid waste; 5-16 parts of a composite activator; 2-10 parts of a cross-linking agent; and 10 to 30 parts of water. The preparation method comprises the following steps: crushing, sieving, mixing and drying various viscous solid wastes to obtain composite viscous solid wastes for later use, adding the pretreated composite viscous solid wastes into a reaction kettle, adding the composite activator and half of water, and stirring for reaction to obtain activated solid waste slurry; adding a cross-linking agent and the other half of water into the activated solid waste slurry, and stirring for reaction to obtain modified slurry; and grinding the modified slurry, sieving, removing impurities, drying and crushing to obtain the environment-friendly adhesive with high bonding strength. According to the present invention, the resource utilization of the viscous solid waste can be completely achieved, the waste material is turned into treasure, the process is simple and environmentally friendly, the cost is low, and the prepared adhesive has characteristics of high bonding strength, good water resistance and good stability, and can be suitable for various scenes.

A novel binding agent may be produced using a powder made by grinding a substance known as a spent mushroom substrate. Such a substance is a waste product of agricultural processes, and yet it contains a high quantity of mycelium, which in turn includes chitin, a natural polymer, that may be used as a key ingredient of the binding agent. Ganoderma lucidum fungi may be a preferred SMS because of its rich chitin content. The novel article, such as a mixed-density particle board, made from bio- composite materials, may be produced by a hot-pressing process using a mixture of the binding agent and a plurality of particles of at least a first natural substance, such as Coco coir to form the article.

The invention relates to the technical field of glass, in particular to tempered laminated hollow glass and a preparation method thereof. The tempered laminated hollow glass comprises glass sheet layers and a laminated layer arranged between the two glass sheet layers, the laminated layer is prepared from the following raw materials in parts by weight: 100 parts of PVB (Polyvinyl Butyral) resin, 15 to 20 parts of polyurethane powder, 15 to 25 parts of functionalized wood flour, 3 to 8 parts of modified nano titanium dioxide, 4 to 8 parts of plasticizer and 0.5 to 1.5 parts of antioxidant. According to the tempered laminated hollow glass provided by the invention, the high flame retardance of the laminated layer material is realized, the problems of easy aging, color change, degumming and the like caused by poor weather resistance of the laminated layer in the long-term use process of the tempered laminated hollow glass are solved, the service life of the tempered laminated hollow glass is further prolonged, and the safety is improved.

Described herein is a process for producing a first and a second aqueous binder composition, each comprising reducing sugars, hydroxymethylfurfural and polylysines, the respective aqueous binder compositions per se, as well as their uses in wood technology. Moreover is described herein a process for producing a lignocellulosic article, selected from a lignocellulosic composite and a lignocellulosic element, and a process for producing a lignocellulosic article, all involving said first and / or said second aqueous binder compositions. Furthermore is described herein said lignocellulosic article, including said lignocellulosic composite and said lignocellulosic element.