33results about How to "Low residual formaldehyde" patented technology

The invention relates to a solid wood composite floor, in particular to a production method for a low-formaldehyde solid wood composite floor. The production method comprises the technological steps of wood plate slicing, drying, repairing, selecting, gluing, pre-pressing, hot pressing, edge cutting and sanding, and finished product obtaining. The key of the production method is that the residual amount of formaldehyde in adhesives is reduced by modifying the used urea-formaldehyde resin adhesives, so that the residual amount of the formaldehyde in the solid wood composite floor is reduced; by adopting high-quality plates and controlling process parameters in the production process, the quality of the produced solid wood composite floor is guaranteed. The content of the formaldehyde in the solid wood composite floor manufactured through the method is low, the quality of the floor is stable, and the floor is not prone to damage; the floor has the characteristics of being comfortable in foot feeling, resistant to abrasion, easy to install and clean, and high in stability.

The invention discloses a method for manufacturing an anti-insect and anti-mold oriented strand board with full eucalyptus leftover materials. The manufacturing method comprises the following steps of: preparing materials, drying, peeling and removing impurities, sorting and storing, respectively gluing on a surface core layer, hierarchically paving, in advance hot press molding, and sanding wood finishes; an isocyanate sawdust powder hybrid adhesive is coated on the surface, and an anti-insect and anti-mold composite urea-formaldehyde resin adhesive is coated on the core layer; wood shavings on the core layer are divided into three-layer structures, comprising intermediate layer of core layer, upper surface layer of core layer and lower surface layer of core layer; the intermediate layer of the core layer is paved longitudinally, and the upper surface layer of the core layer and the lower surface layer and surface layer of the core layer are paved horizontally. For the oriented strand board prepared by the method, the static bending intensity in a parallel direction is in a scope of 33-39 MPA, the parallel elasticity modulus is in the scope of 4614-4779 MPA, the vertical elasticity modulus is in the scope of 1504-1771 MPA, the thickness swelling rate of water absorption in 24 h is in the scope of 10%-17%, and the vertical nail-holding power reaches up to 89000N. In the manufacturing method, a problem that the board is easy to suffer from erosion of white ants and moths is thoroughly solved by adding an anti-insect and anti-mold additive, and the service life of the board is prolonged.

The invention discloses a method for producing particle board by adopting moisture-proof composite urea resin. The method comprises the steps of material preparation, drying, debarking, sand removing, sorting, grinding, glue blending, hot pressing molding and the like. The key points of the production method disclosed by the invention are that melamine modified urea resin is adopted as a main material of an adhesive and is added with oxidized starch to form a viscous compound, polyvinyl alcohol is taken as a toughening agent, magnesium oxide is taken as an antiaging agent, hexamine and triglycidyl isocyanurate are taken as a curing agent, isobutyl triethoxy silane is taken as a bridging agent, phenolated lignin is taken as a formaldehyde catcher and a moisture-proof agent is also added to prepare the moisture-proof composite urea resin; the composite urea resin has the advantages of being low in formaldehyde residual volume, good in water resistance and good in moisture resistance; therefore, the produced particle board is low in formaldehyde residual volume, hard to expand after absorbing water and hard to arch and deform, and a wear-resistant layer is hard to damage. The particle board produced by the method disclosed by the invention is low in formaldehyde residual volume, also stable in quality, hard to damage, good in water resistance and good in moisture resistance.

The invention relates to a method for producing a low-formaldehyde medium-density fiberboard and belongs to the technical field of wood resource utilization. The method for producing the low-formaldehyde medium-density fiberboard comprises the technological steps of raw material slicing, impurity-removal and screening, boiling, waxing and hot grinding, gluing and drying, mat formation and hot pressing, and finished product obtaining. According to the method, residues, such as battens and waste veneer, generated during wood processing are used for producing the low-formaldehyde medium-density fiberboard, waste materials are recycled, and full utilization of wood resources is effectively achieved; the formaldehyde residual volume of low-formaldehyde urea formaldehyde resin adhesive used for producing the medium-density fiberboard is low, in this way, harm to the health of human bodies is reduced, and the bonding force is high; in addition, the fiberboard has good damp-proof performance and good water-proof performance, the internal structure of the board is uniform, the density is proper, the dimensional stability is high, the quality is stable, and the service life is long.

The invention provides a method for producing a high-temperature-resisting oriented particle board by using a total-eucalyptus leftover material. The method comprises the steps of material preparation, drying, debarking, impurity removing, sorting, storage, respective gluing of a surface layer and a core layer, classified paving, pre-hot-pressing molding, sanding of an overcoating and the like, wherein the surface layer is coated with an isocyanate sawdust powder composite adhesive; the core layer is coated with a high-temperature-resisting composite urea resin adhesive; the core layer wood shaving is of a three-layer structure which comprises a core layer middle layer, a core layer upper surface layer and a core layer lower surface layer; the core layer middle layer is paved longitudinally; the core layer upper surface layer, the core layer lower surface layer and the surface layer are paved horizontally. The oriented particle board prepared by the method provided by the invention is 31MPa to 40MPa in parallel static bending intensity, 4605MPa to 4776MPa in parallel elasticity modulus, 1501MPa to 1770MPa in vertical elasticity modulus, 10% to 18% in thickness swelling rate of 24-h water absorption and as high as 89009N in vertical nail-holding power, and is good in dimensional stability and reliability. Moreover, the oriented particle board prepared by the method provided by the invention is also excellent in heat resistance.

The invention provides a method for producing flame-retardant oriented strand boards with full eucalyptus wood scraps. The method comprises the working procedures of material preparation, drying, debarking and impurity removal, sorting and storage, respective gluing on surface layers and a core layer, graded laying, preheating pressing molding, sanding and finishing, and the like, wherein the surface layers are coated with isocyanate sawdust powder compound adhesive, the core layer is coated with flame-retardant compound urea-formaldehyde resin adhesive, core layer shavings are divided to form a three-layer structure which includes a core layer middle layer, a core layer upper surface layer and a core layer lower surface layer, vertical laying is adopted for the core layer middle layer, and transverse laying is adopted for the core layer upper surface layer, the core layer lower surface layer and the surface layers. According to the oriented strand boards produced with the method, the static bending intensity in the parallel direction ranges from 30 MPa to 40 MPa, the parallel elasticity modulus ranges from 4600 MPa to 4770 MPa, the vertical elasticity modulus ranges from 1500 MPa to 1780 MPa, the thickness swelling rate of water absorption of 24 hours ranges from 10% to 17%, the vertical nail-holding power is as high as 89000 N, and the dimensional stability and reliability are good. In addition, the oriented strand boards produced with the method further have the excellent effect of flame retardance.

The invention provides a method for producing a weather-resistant oriented strand board by using a full-eucalyptus leftover material. The method includes material preparation, drying, peel and impurity removing, sorting storage, gluing of a surface layer and core layer, classified pavement, pre-hot pressing forming, facing sanding and other working procedures. The surface layer is coated with isocyanate sawdust powder composite adhesives, and the core layer is coated with weather-resistant composite urea-formaldehyde resin adhesives. Core layer wood shavings are divided into three layers of structures and comprise a core layer middle layer, a core layer upper surface layer and a core layer lower surface layer. The core layer middle layer is longitudinally laid, and the core layer upper surface layer, the core layer lower surface layer and a surface layer are transversely laid. According to the oriented strand board prepared through the method, the static bending intensity in the parallel direction is 31-40MPa, and the parallel elasticity modulus is 4580-4760MPa; and the vertical elasticity modulus is 1510-1790MPa, the 24 h thickness swelling rate of water absorption is 11%-16%, vertical nail-holding ability reaches up to 87800N, and the dimensional stability and reliability are good. Moreover, the oriented strand board prepared through the method has excellent weather resistance.

The invention provides a method for producing an antiseptic oriented strand board through full-eucalyptus leftover materials. The method comprises the procedures of material preparing, drying, peel and impurity removing, sorting and storing, surface layer and core layer gluing, classified paving, preheating press forming, sanding facing and the like. A surface layer is coated with an isocyanate wood dust powder composite adhesive, a core layer is coated with an antiseptic composite urea-formaldehyde resin adhesive, and core layer wood shavings are of three-layer structures including a core layer middle layer, a core layer upper surface layer and a core layer lower surface layer. The core layer middle layer is longitudinally laid, and the core layer upper surface layer, the core layer lower surface layer and the surface layer are transversely laid. According to the oriented strand board prepared through the method, the static bending intensity in the parallel direction ranges from 34 MPa to 38 MPa, and the parallel elasticity modulus ranges from 4,610 MPa to 4,780 MPa; and the vertical elasticity modulus ranges from 1,500 MPa to 1,774 MPa, the water absorption thickness swelling rate in 24 h ranges from 11% to 16%, and the vertical nail holding force reaches up to 89,000 N. Meanwhile, through adding of an antiseptic agent, the problem that panels are prone to suffering from corrosion of wood-destroying fungi, moulds and white ants is thoroughly solved, and the service life of the panels is prolonged.

The invention discloses a method for producing total-eucalyptus plywood by adopting moisture-proof composite urea resin. The method comprises the following steps: rotatably cutting wood boards; drying each board; gluing; performing cold pressing for three times; stewing and conditioning; performing hot pressing for three times; cooling and conditioning; determining the thickness of a board blank and sanding the board blank. The key points of the production method disclosed by the invention are that melamine modified urea resin is adopted as a main material of an adhesive and is added with oxidized starch to form a viscous compound, polyvinyl alcohol is taken as a toughening agent, magnesium oxide is taken as an antiaging agent, hexamine and triglycidyl isocyanurate are taken as a curing agent, isobutyl triethoxy silane is taken as a bridging agent, phenolated lignin is taken as a formaldehyde catcher and aliphatic polyurethane acrylate is taken as a moisture-proof agent to prepare the composite urea resin; the composite urea resin has the advantages of being low in formaldehyde residual volume, good in water resistance and good in moisture resistance; therefore, the produced total-eucalyptus plywood is low in formaldehyde residual volume, hard to expand after absorbing water and hard to arch and deform, and a wear-resistant layer is hard to damage.

The invention relates to a method for producing full-eucalyptus plywood with flame-retardant composite urea-formaldehyde resin, comprising the steps of wood board peeling->veneer drying -> gluing -> three times of cold pressing -> standing for curing->three times of hot pressing ->heat dissipation for curing->slab calibrating and sanding. The method is characterized in that the melamine modified urea-formaldehyde resin is used as the main ingredient in the adhesive; the oxidized starch as adhesive compound, the polyving akohol as toughening agent, the hydrogenated rosin as antioxidant, the polyisocyanate as curing agent, i-butyltriethoxanesilane as bridging agent, phenolic lignin as formaldehyde scavenger and flame retardant agent are added together to produce the flame-retardant composite urea-formaldehyde resin. The flame-retardant composite urea-formaldehyde resin has such advantages as littleformaldehyde residue, perfect flame resistance and lowering combustion temperature by internal endothermic reaction so that the full-eucalyptus parquet contains little formaldehyde residue and has good flame-retardant effectin case of fire disasters.

The invention provides a moisture-proof modified urea resin adhesive. The moisture-proof modified urea resin adhesive is prepared from the following raw materials in parts by weight: 55-75 parts of modified urea resin, 4-8 parts of polyvinyl acetate emulsion, 0.4-0.9 part of vinyltrimethoxysilane and 25-35 parts of filler; the preparation method of the moisture-proof modified urea resin adhesive comprises the following steps: firstly, preparing the modified urea resin, adding formaldehyde at a time, adding urea at three times, and adding oxidized starch and furfuryl alcohol in the reaction process as modifiers, wherein the production of the modified urea resin is divided into three stages, namely a reaction initial stage, a reaction middle stage and a reaction later stage; adding the polyvinyl acetate emulsion and triethoxyisobutylsilane after polymerication at the later stage, stirring and mixing evenly and then adding the filler; due to the process, the gelation phenomenon in the polymerization process is avoided; the obtained urea resin is improved in water resistance and low in formaldehyde residue; if the urea resin is applied to producing an artificial board, the obtained artificial board can be applied to a high-humidity environment in the south, and is low in formaldehyde release amount.

A process for removing formaldehyde from synthetic protein fibres to prevent the damage of residual formaldehyde to human body includes such steps as preparing 40% aqueous solution of sodium hydrogensulfite, washing the acetalized protein fibres with water, immersing in said aqueous solution at 40-60 deg.C for 5-10 min, water washing and centrifugal drying. Its advantages are high effect, simpleprocess, and bleaching action.

The invention discloses a preparation technology for a pesticide microcapsule. According to the preparation technology for the pesticide microcapsule, by introducing a third monomer on the basis of a routine urea-formaldehyde condensation method, the thermal stability, the mechanical strength and the capsule size distribution of microcapsule particles are substantially improved. The preparation technology for the microcapsule is simpler and easier to operate compared with the routine urea-formaldehyde condensation technology in the industrial production process, the pesticide microcapsule suspending agent prepared by employing the technology completely accords with all national indexes, and the formaldehyde residual quantity is obviously lower than that of a microcapsule suspending agent prepared by employing a routine urea-formaldehyde condensation technology, and therefore the preparation technology helps to relatively well protect environment and is relatively friendly to environment.

The invention discloses a method for producing particle board by adopting flame-retardant composite urea resin. The method comprises the steps of material preparation, drying, debarking, sand removing, sorting, grinding, glue blending, hot pressing molding and the like. The key points of the production method disclosed by the invention are that melamine modified urea resin is adopted as a main material of an adhesive and is added with oxidized starch to form a viscous compound, polyvinyl alcohol is taken as a toughening agent, hydrogenated rosin is taken as an antioxidant, polyisocyanate is taken as a curing agent, isobutyl triethoxy silane is taken as a bridging agent, phenolated lignin is taken as a formaldehyde catcher and a flame retardant is also added to prepare the flame-retardant composite urea resin; the composite urea resin has the advantages of low formaldehyde residual volume and good flame retardance; by internal heat absorption reaction, the combustion temperature is reduced, so the produced particle board is low in formaldehyde residual volume and is effectively flame-resistant when a fire occurs.

The invention relates to low-formaldehyde high-elasticity semi-hard melamine foam and a preparation method thereof.The preparation method comprises the steps that 1-10 parts of polyhydroxy compound, 15-35 parts of formaldehyde, 25-40 parts of melamine, 10-40 parts of water and 5-20 parts of flexibilizer are prepared to obtain block type foaming prepolymerization liquid; and adding an emulsifier, a foaming agent, a curing agent and a modifier to prepare the melamine foam by taking the foaming prepolymerization liquid as a main body. Compared with the prior art, the melamine foam disclosed by the invention has the advantages of intrinsic flame-retardant property, excellent heat resistance, excellent sound absorption property, excellent thermal insulation property and low formaldehyde content, so that the melamine foam has a wide application prospect.

The invention relates to home building materials, in particular to a method for producing a cabinet board by adopting damp-proof composite urea resin. The cabinet board structurally comprises decorative paper, a China fir veneer, a chipboard and a backboard from top to bottom, wherein the four sides of the cabinet board are edged with aluminum alloy; damp-proof composite urea resin adhesives are smeared between the China fir veneer and the chipboard; damp-proof composite urea resin adhesives are smeared between the chipboard and the backboard; and the chipboard in the cabinet board adopts damp-proof composite urea resin adhesives as well. The cabinet board manufactured through the method has the properties of high water resistance, high adhesive strength and low formaldehyde residual volume and the damp-proof function. The raw materials adopted by the chipboard in production of the cabinet board are waste materials-leftover materials which can not be used in the process of manufacturing a multi-layer eucalyptus board after rotary cutting of the eucalyptus board. The leftover materials are used, so that wood materials are saved, and the production cost is reduced for enterprises.