99results about "Polymerisation impregnation" patented technology

A method of treating a cellulose-based material, for example wood and engineered wood is provided, wherein the process involves the following steps: selecting and placing the cellulose-based material in a treatment chamber; impregnating the cellulose-based material with an impregnating agent consisting of an aqueous solution comprising a fluid suitable for esterification; facilitating a hydrolysis process whereby the impregnating agent reacts resulting in the formation of esters and polyesters inside the cellulosed-based material.

A method for forming an engineered veneer block includes stacking a plurality of laminate layers. The method also includes spreading a bonding agent between each layer of the plurality of laminate layers. The bonding agent includes an adhesive. The adhesive consists essentially of one or more no added formaldehyde adhesives. The method also includes slicing an engineered veneer from the engineered veneer block. The engineered veneer has a thickness in the range of 0.1 millimeters to 0.5 millimeters.

The application discloses an ant-termite drug barrier system for wood composites and a construction method and application thereof, and relates to the technical field of wood composite ant-termite prevention. The ant-termite drug barrier system comprises a drug active ingredient, a nanoscale modified silicon dioxide carrier, a penetration enhancer, an adhesion enhancer and a stabilizer, and the drug barrier can be efficiently constructed on the surface of the wood composite by a vacuum-assisted impregnation method, and the thickness is controllable and the operation is convenient. The nanoscale modified silicon dioxide carrier is combined with a complex system of sodium fatty alcohol polyoxyethylene ether sulfate and alkyl polyglycoside, so that the permeability and adhesion can be significantly improved. The system is suitable for indoor and outdoor environments, can be coated with a waterproof coating to prolong the service life, and can be conveniently repaired when locally damaged; the drug active ingredient is non-toxic or low-toxic, so that an efficient, durable and environmentally-friendly ant-termite solution for wood composites is provided.

The application discloses a high-efficiency dehydration protection method for water-saturated wooden cultural relics, and specifically comprises the following steps: step 1, preparing a xylitol aqueous solution with a concentration of 30-80 wt%; step 2, soaking the water-saturated wooden cultural relics in the xylitol aqueous solution prepared in step 1 until the xylitol permeates into the water-saturated wooden cultural relics; step 3, taking out the water-saturated wooden cultural relics and removing the excess xylitol on the surface of the water-saturated wooden cultural relics; step 4, spraying a chitosan aqueous solution with a concentration of 1-5 wt% on the surface of the water-saturated wooden cultural relics treated in step 3 for multiple times; and step 5, spraying a glutaraldehyde aqueous solution with a concentration of 2-10 wt% on the surface of the water-saturated wooden cultural relics treated in step 4 for multiple times, then wrapping the water-saturated wooden cultural relics with a breathable film, and airing the water-saturated wooden cultural relics until the constant weight of the water-saturated wooden cultural relics is reached, thereby completing the dehydration and shaping of the water-saturated wooden cultural relics.

In some embodiments, a material comprises a contiguous block of chemically-modified wood infiltrated with an index-matching polymer. The contiguous block has a first section that is substantially transparent to light and a second section that is translucent or opaque. The first section can have a lower lignin content than the second section. Alternatively, the first section can have a chromophore state altered from that of the wood in its natural state, and the lignin in the second section can retain a chromophore state of the wood in its natural state. In some embodiments, a material comprises a section of wood chemically-modified such that chromophores of lignin within the wood in its natural state are altered or removed, and the section retains at least 70% of the lignin of the wood in its natural state. Methods for forming such materials are also disclosed.

In a method for treating wood, wherein a wooden body is impregnated with a polymerizable compound which is polymerizable by oxidation, the polymerizable compound is brought into contact with an oxidizer in the wooden body in order to polymerize the polymerizable compound in situ. The polymerizable compound applied therein comprises a heterocyclic compound with nitrogen and / or sulphur as heteroatom. The oxidizer is brought into solution and the wooden body is saturated with a solution of the oxidizer. The wooden body is subjected to a vapour phase of the heterocyclic compound under an increased pressure and the heterocyclic compound is polymerized in situ in the wood.

The application discloses a preparation method of formaldehyde-free low-carbon wood composite material, which comprises the following steps: preparing an impregnation solution, removing lignin on wood by using an alkaline solution to obtain a wood matrix; pretreating the obtained wood matrix by using a gas phase treatment process to control and adjust the pores on the wood matrix; cyclically freezing and impregnating the wood matrix by using the impregnation solution; heating the wood matrix after the S3 treatment; and ultraviolet curing, so that the voids on the wood after the lignin is removed are more uniform, the impregnation of the impregnation solution in the later impregnation process is easier, the situation that all areas cannot be filled is avoided, the uniformity of the pores is greatly improved, the impregnation degree and impregnation efficiency in the later impregnation process are improved, and the physical performance and stability of the wood are improved.

The present invention discloses a method for producing a modified wooden material. Specifically disclosed is a method for producing a modified wooden material, said method comprising: 1) a step for causing permeation, into a wooden material, of a 5-hydroxymethylfurfural (5-HMF) resinification solution containing 5-HMF and an inorganic salt for promoting polymerization of the 5-HMF; and 2) a step for polymerizing the 5-HMF of the permeated 5-HMF resinification solution in the wooden material by means of heating.

A part made from lignocellulosic material (10) is formed from a single sheet (11) of partially delignified lignocellulosic material impregnated with an impregnation polymer. The part (10) comprises at least one curved portion having a double curvature surface. The part made from lignocellulosic material is produced by a production method implementing a thermoforming step. Use in particular for producing wood veneer structures.

This wood composite material comprises: an inner layer that includes wood and resin; an obverse layer provided on the obverse surface of the inner layer, the obverse layer including wood and resin; and a reverse layer provided on the reverse surface of the inner layer, the reverse layer including wood and resin. The total of the filling rate of the obverse layer and the filling rate of the reverse layer is no greater than half the filling rate of the wood overall.

The present invention relates to a method for obtaining a ligno-cellulosic composite material, a ligno-cellulosic composite material that can be obtained by this method, and the use of this ligno-cellulosic composite material.

The invention relates to a method for producing a coated wooden component that has biological protection against infestation by wood-destroying and / or wood-staining fungi, based on impregnation or pretreatment with a pre-culture and / or with spores of a fungus, in particular of the genus Trichoderma, that acts antagonistically towards wood-destroying and / or wood-staining microorganisms. The invention further relates to a wooden component produced by the method and its use as a building material in building construction, particularly in exterior applications.

The plant material may be infiltrated with a solution having a stabilizer and / or a stabilizer precursor. The stabilizers and / or precursors may be absorbed within amorphous and / or hemicellulosic regions of the cell wall of the plant material. After permeation, the amorphous cellulose and / or hemicellulose may be cross-linked with the stabilizer. The stabilizer precursor may include a nucleophilic agent and an electrophilic agent, and the stabilizer may include a reaction product of a nucleophilic agent and an electrophilic agent. Each of the stabilizer and / or the precursor may have a molecular weight of less than or equal to 500 g / mol during permeation. After cross-linking, the stabilizer may impart higher water stability to the plant material, in particular, to limit swelling of the plant material regardless of the duration of exposure to water and / or the amount of water absorbed by the plant material.

This invention discloses a Litsea cubeba essential oil preparation, which is prepared by mixing a 1% (w / w) chitosan quaternary ammonium salt solution with a Litsea cubeba essential oil ethanol mixture at a volume ratio of 4:1; the volume ratio of Litsea cubeba essential oil to anhydrous ethanol in the Litsea cubeba essential oil ethanol mixture is 2:3. The Litsea cubeba essential oil preparation prepared by this invention exhibits good dispersibility and stability, achieving 100% short-term and long-term antibacterial effect against Aspergillus flavus. This is significantly superior to using Litsea cubeba essential oil or chitosan quaternary ammonium salt alone, as well as other chitosan quaternary ammonium salt-Litsea cubeba essential oil preparations, and even more superior to commonly available antifungal agents. Its preparation method is simple, non-toxic, harmless, and does not pollute the environment. It has low production costs and can be used to prevent or inhibit the growth of Aspergillus flavus, reducing its damage to wooden household products.

The invention discloses a color laminated board production process based on ultrahigh pressure dipping coloring, and belongs to the technical field of artificial board manufacturing. Firstly, high-temperature heat treatment is conducted on a wood veneer, and the pore structure of the wood veneer is optimized; then preparing a functionalized colored resin adhesive containing nanoscale coloring; the key step adopts a synergistic ultrahigh-pressure impregnation technology, so that resin deeply permeates into a wood cell wall layer, and coloring and reinforcing are integrated; and finally, the dipped wet-state veneer is subjected to one-time forming in a directional assembly and hot pressing process. Traditional dyeing and intermediate drying links are thoroughly omitted, dyeing wastewater is completely eradicated from the source, the process is remarkably shortened, and energy consumption is reduced. The obtained product has excellent physical and mechanical properties, extremely high dimensional stability and lasting color weather resistance, and is suitable for manufacturing high-end outdoor building materials and furniture.

The invention discloses a preparation method and application of self-healing wood, and belongs to the technical field of wood processing. The preparation method of the self-healing wood comprises the following steps: firstly, synthesizing a polymer containing a steric hindrance urea bond, taking hydroxyl-terminated polymer dihydric alcohol, diisocyanate and N, N '-di-tert-butylethylenediamine as raw materials, and carrying out prepolymerization, chain extension and grafting to obtain the self-healing wood; secondly, delignification treatment is conducted on the wood twice, specifically, the wood is treated with a sodium sulfite / sodium hydroxide solution at the temperature of 80-100 DEG C for 4-8 hours and then treated with a hydrogen peroxide solution at the temperature of 70-90 DEG C for 4-8 hours; and then the wood is subjected to vacuum impregnation with a polymer for 8-24 h, curing is conducted at the temperature of 70-90 DEG C, hot-pressing reinforcement is conducted at the temperature of 80-100 DEG C and the pressure of 10-20 MPa, and the self-healing wood is obtained. Through reaction of isocyanate groups on large-steric-hindrance urea bonds and hydroxyl groups on cellulose, medium-temperature efficient repairing is achieved, the compressive strength can be restored to the original wood standard level, the strength improving effect is achieved, and the method is suitable for the fields of wood repairing and bearing wood components.

The invention relates to methods for preparing modified wood and wood products, including methods to fortify wood by increasing the strength and / or density of wood so as to yield a fortified wood or wood product. The methods can be used to, for example, improve the performance, alter the appearance, and / or improve the durability of wood, and particularly, solid wood. The methods comprise a combination of resin and thermal treatments to yield modified wood and modified wood products.

The invention relates to a preparation method of a transparent wood packaging film, in particular to a preparation method of a full-bio-based transparent wood film with a full-green process. The technical problems that existing transparent wood is poor in biodegradability, poor in waterproofness, complex in manufacturing process, toxic in reagent and poor in barrier property are solved. The method comprises the steps that after wood is bleached, pores of the wood are filled with a mixed solution of citric acid and sodium carboxymethyl cellulose through vacuum impregnation, and a uniform and compact structure is constructed; the transparency of the transparent wood film is 18%-30%, the haze is 65%-85%, the strength reaches 74-80 MPa, the water vapor transmission rate is (3.5-4.5) * 10 <-10 > g m <-1 > s <-1 > Pa <-1 >, and the transparent wood film has good water resistance and dimensional stability, is biodegradable and can be used in the field of food packaging.

This invention discloses a quaternary ammonium salt-modified lignin-based epoxy resin emulsion and its preparation and application methods. It is prepared by reacting quaternary ammonium salt, epoxidized lignin, polyamine compounds, reactive diluents, organic solvents, and water. The quaternary ammonium salt and polyamines are uniformly mixed and reacted in an organic solvent under stirring. Then, epoxidized lignin is added to continue the reaction, yielding the quaternary ammonium salt-modified lignin-based epoxy resin. Water is added to reduce the viscosity, resulting in the quaternary ammonium salt-modified lignin-based epoxy resin emulsion. After adding a curing agent and stirring evenly, it can be used to treat wood and bamboo materials by surface coating, immersion, vacuum impregnation, or pressure impregnation. The quaternary ammonium salt-modified lignin-based epoxy resin emulsion prepared by this invention exhibits good antibacterial, antifungal, and UV-resistant effects after curing, and its application to wood and bamboo materials can effectively improve their dimensional stability and durability.

The invention provides a method of producing a piece of delignified wood having a porous structure, said method comprising: chemically treating a piece of natural wood to remove at least 90% of lignin from the natural wood while substantially retaining cellulose-based lumina of the natural wood, thereby producing a piece of delignified wood; after the removing, drying the piece of delignified wood by freeze drying or critical point drying, such that the cellulose-based lumina remain open or unobstructed in a cross-sectional view; and after the drying, further chemically treating the piece of delignified wood to be hydrophobic or resistant to weather or salt water, or forming or depositing a coating on exterior surfaces of the delignified wood. The unique microstructure and composition of the delignified wood can provide advantageous thermal insulation properties, among other advantages described herein.

The present invention relates to a polymerizable solution for impregnating wood, a method for impregnating wood with the solution, and impregnated wood impregnated with the solution. The polymerizable solution contains furfuryl alcohol in the range of 25-75% by weight based on the total weight of the solution, a carboxylic acid in the range of 0.01-0.15 mol / kg based on the total weight of the solution, maleic anhydride in the range of 0.25-4% by weight based on the total weight of the solution, condensate from a previous wood hardening process in the range of 24-74% by weight based on the total weight of the solution, and a water-soluble alkali salt in an amount to obtain a pH in the range of 3-5 at the time the solution is made.

The present invention relates to an improved wood coating composition wherein said composition (C) comprises, relative to the total weight of composition (C), from 58.00 to 95.00 weight percentage of at least one alkyd resin or at least one drying oil, from 0.10 to 8.00 wt. % of at least one microcrystalline wax having a congealing point from 60° C. to 100° C., and from 5.00 to 34.00 wt. % of at least one synthetic micronized wax, said at least one synthetic micronized wax having a particle size D90 equal to or less than 36.0 μm and a particle size D50 equal to or less than 20.0 μm, wherein the congealing point of the microcrystalline wax (Wc) is measured according to the standard ASTM D938, and wherein the particle size of the at least one micronized wax (Mp) is measured according to the standard DIN ISO 13320.

To provide a wood-based resin composition for flow molding with excellent mold transferability, surface hardness, and film moldability when made into a wood molding body.SOLUTION: A method of producing a wood-based resin composition for flow molding according to the present invention includes an impregnation process in which a thermoplastic resin is impregnated into the wood-based material by bringing the thermoplastic resin into contact with the wood-based material, a resulting composition is in one or more shapes selected from a group consisting of plates, fibers, columns, and spheres, the maximum length of the composition is 1 to 30 mm, and the wood-based material content is 50 mass% or more and less than 95 mass% and the thermoplastic resin content is more than 5 mass% and 50 mass% or less, relative to the total mass of the composition. The thermoplastic resin has one or more bonds selected from the group consisting of amide bond, ester bond, ether bond, and thioether bond in the main chain backbone of the repeating unit, or one or more terminal groups selected from the group consisting of carbonyl group, acid anhydride group, amide group, and hydroxyl group.SELECTED DRAWING: None

The application provides a preparation method of a hydrophobic anti-leaching fire-retardant plywood, comprising the following steps: (1) impregnating wood veneers in a fire-retardant liquid and a silica sol polymer resin mixed emulsion in sequence to obtain fire-retardant veneers; (2) assembling the fire-retardant veneers in a longitudinal and transverse interlaced manner to obtain a fire-retardant plywood base material; and (3) coating a hydrophobic coating on the surface of the fire-retardant plywood base material to form a hydrophobic coating layer, thereby obtaining the hydrophobic anti-leaching fire-retardant plywood. The wood veneers are impregnated in the fire-retardant liquid and the silica sol polymer resin mixed emulsion in sequence to fill the interior of the wood units, the polymer resin is used as a coating material in the silica sol, the anti-leaching performance of the fire retardant is enhanced, and the hardness and water resistance of the entire plywood are enhanced. The fire-retardant plywood base material is subjected to hydrophobic treatment, so that the plywood is endowed with self-cleaning ability, and the occurrence of adverse phenomena such as corrosion and insect damage is reduced.

The invention belongs to the technical field of wood modification and flame retardance, and particularly relates to a preparation method of high-flame-retardance and high-strength modified wood. By introducing quaternized waterborne epoxy resin and a condensed phase flame-retardant system, a flame-retardant-reinforced synergistic composite structure is constructed in the wood, so that the flame-retardant property of the wood is remarkably improved while the mechanical property is maintained and improved. According to the preparation method, the industrial problem that the inflammability and the mechanical property of wood are difficult to consider at the same time is fundamentally solved, the forest fiber / epoxy resin high-strength flame-retardant material is constructed through forest fiber chemical component and microstructure regulation and control, organic / inorganic hybridization and in-situ heterogeneous compounding, the flame retardant property and the mechanical property of the wood are improved, and the flame retardant property and the flame retardant property of the wood are improved. Meanwhile, the green chemical principle is emphasized in the whole process, low-toxicity, halogen-free and renewable flame-retardant components are preferentially used, development of the green flame-retardant technology is promoted, and the national dual-carbon strategic target is met.

A flame retardant cellulose-based product formed from ingredients comprising : (i) a cellulose-based material selected from paper-based material, wood-based material and bamboo-based material; (ii) a brominated phosphate ester of Formula (la), wherein the brominated phosphate ester of Formula (la) is present in an amount of about 5% to about 20 % by weight of the cellulose- based product; and (iii) a melamine resin selected from partially methylated melamine formaldehyde resin, methylated melamine formaldehyde resin, and methylated high imino melamine resin, having a molecular weight above 150 gr / mole, above 180, above 300, above 400, above 500, above 600, above 700 gr / mole, preferably having a molecular weight of about or above 500 gr / mole, wherein the melamine resin is present in an amount of about 10% to about 20% by weight of the cellulose-based product.

A material can comprise a contiguous block of chemically-modified wood infiltrated with an index-matching polymer. The contiguous block has a first section that is substantially transparent to light and a second section that is translucent or opaque. The first section can have a lower lignin content than the second section. Alternatively, the first section can have a chromophore state altered from that of the wood in its natural state, and the lignin in the second section can retain a chromophore state of the wood in its natural state. In some embodiments, a material comprises a section of wood chemically-modified such that chromophores of lignin within the wood in its natural state are altered or removed, and the section retains at least 70% of the lignin of the wood in its natural state. Methods for forming such materials are also disclosed.

The invention discloses a nano-material modification process for improving wood stability, which comprises the following steps: mixing wood with sodium hydroxide, sodium sulfite and deionized water to prepare a pretreatment solution, treating the wood with the pretreatment solution to increase the porosity of the wood, preparing pretreated wood, soaking the pretreated wood in a nano-material, and drying to obtain the nano-material modified wood. Under the action of air pressure, the nano material enters pores of the wood, temperature rise and heat preservation are carried out, the nano material is cured, wood modification is completed, a dual dynamic cross-linked network formed by the nano material is combined with rich hydrogen bonds of polyurethane, multi-layer physical-chemical cross-linked points can be constructed, and the wood modification effect is improved. A rigid dynamic covalent bond serves as a permanent cross-linking point to guarantee strength and modulus, and a hydrogen bond serves as a reversible physical cross-linking point and is preferentially broken to dissipate energy when being stressed, so that the material is endowed with high toughness, and the mechanical property of the treated wood is greatly improved.

The present application relates to bamboo product processing technical field, specifically to a kind of bamboo product processing method, comprising: cross bamboo into bamboo section, then bamboo section is processed into bamboo blank;Collect the bamboo fiber debris generated during bamboo processing, after washing and impurity removal, the bamboo fiber debris is crushed;Modulate composite liquid, including the composite enzyme of xylanase and cellulase, bamboo blank is dried to moisture content 10-12%, laser engraving machine is used to engrave on the area where bamboo blank needs to be laser engraved;Composite liquid is coated or sprayed on the surface of laser engraved area;The present application realizes the recovery of bamboo fiber by collecting and crushing raw materials during bamboo processing. The degradation product of the composite enzyme of xylanase and cellulase is used as the precursor of repair material. Nano-bamboo cellulose and sodium hyaluronate form a network structure under the action of enzyme, nano-bamboo cellulose combines with degradation product to form new crosslinking point and fill the cracks.