121results about How to "Improve internal bond strength" patented technology

The present invention provides binder compositions comprising an ethylenically unsaturated carboxy acid grafted lignin or lignosulfonate component, and an oxazoline-functional group containing polymer or resin component, the two components in a solids weight ratio of from 50:50 to 98:2. As formulated, the compositions may comprise from 40 to 98 wt. % of the acid grafted lignosulfonate, preferably, 50 wt. % or more. Preferably, the binder composition further comprises one or more in situ acid generator compound to insure more rapid cure on heating or pressing. The binder enables the provision of low cost composite materials comprising a majority component derived from natural materials, and having a reasonable wet strength.

The invention provides an adhesive for grade-E0 medium density fiberboards. The raw materials of the adhesive include formaldehyde, polyvinyl alcohol, urea and tripolycyanamide. The production process of the adhesive comprises: firstly, adding all formaldehyde into a reaction kettle, regulating the pH value of formaldehyde solution to 7.5 to 8.5 by using sodium hydroxide solution, adding the 40 to 50 percent of polyvinyl alcohol and urea and adding 80 to 90 percent of tripolycyanamide and adding the 10 to 20 percent of urea; secondly, adjusting the pH value to 5 to 6 by using formic acid, reacting for 20 to 30 minutes till a cloud point, regulating the pH value to 705 to 8.5 with caustic soda solution, and adding the 10 to 20 percent of tripolycyanamide and 20 to 30 percent of urea; and finally, adding 10 to 20 percent of urea, regulating the pH value of the adhesive to 6.6 to 7.5, and discharging. The adhesive has the advantages that: the free formaldehyde content is very low, and the manufactured medium density board is of grade E0; the curing time is proper, the storage stability is high, and the normal-temperature storage period is about 1 month; and the manufactured medium density board has high internal combining strength and high waterproof and dampproof performance.

The invention relates to a method for manufacturing a weed wood and straw compounding medium density fiberboard with a laminated structure. The method adopts straw and weed wood as raw materials, andincludes the following steps: the straw and the weed wood are respectively processed by defibration, and urea formaldehyde resin adhesive and waterproof agent are added, and in the process of formation, straw fibres and wood fibres are proportionally assembled and laminated in the direction of thickness and then are processed by thermocompression to form boards. The method has the advantages thatproved by performance tests, the flexural modulus, the strength and the internal bonding strength of the medium density fiberboard, compared with a pure straw medium density fiberboard, are respectively and obviously increased under the same condition, and the expansion rate of water-absorbing thickness and the water absorption rate are lowered; and the relative performances of the compound material can be increased by changing the mode of lamination. The method efficiently and comprehensively utilizes the agricultural straws and saves wood resources, thereby protecting the ecological environment. The product can be applied to the occasions of furniture manufacturing and production, base materials for interior decoration, and the like.

The invention discloses a straw particle board manufacture method, which relates to a particle board manufacture method. The invention solves the problem that the straw surface includes a plurality of waxy layers and SiO2 substance, common urea formaldehyde resin glue and phenolic resin are hard to wet the straw surface to cause a plurality of gluing difficulty. The invention has the method that: the straw is cut into pieces and performed ash removal at first, and straw crushed aggregates which are performed with the pretreatment through the blending ratio of the 1:4 to 5.0 according to the mass ratio of the straw and alkali liquor is soaked in the alkali liquor of 1.4 to 1.6 wt percent (mass) for 10 to 15 hours, and the straw particle board can be manufactured after drying, glue applying, paving, pre-pressing, hot pressing, and cooling. The equipment performance request of the straw particle board manufacture through the invention is low, the method is simple, and the operation parameter is easy to control. The method of the invention for performing chemical treatment to the straw raw material surface improves the wetting property of the raw material, greatly enhances the inner combination intensity, enlarges the application scope of the straw, releases the lack of the timber resources, and the invention has great economic and social efficiency in the situation that the conflict between supply and demand becomes more prominent.

The invention discloses a manufacturing method of Pinfeng base paper. The method comprises the following processing steps: pulping and preparing softwood pulp and hardwood pulp respectively; adding auxiliary materials; making wet paper sheets; carrying out pre-drying and surface sizing treatment; and carrying out post-drying, calendaring and finishing. Through research on slurry selection, slurry proportioning, a beating technology, a functional chemical additive added to the slurry and a digital printing assistant, measures of calendaring and the like are carried out by film-transfer surface sizing treatment by soft calendaring equipment; and the qualified Pinfeng base paper is manufactured by referring to related paper machine parameters. Compared with ordinary logistics label middle paper, the Pinfeng base paper has the advantages of low gram weight, high tensile strength, good internal bonding strength, high smoothness, low hygroscopic property, good surface strength, good digital printing effect, fine paper surface and good hand feeling, and is capable of completely replacing the ordinary logistics label middle paper and reducing the production cost for customers.

The invention relates to the technical field of wall decorating plates for buildings and discloses an environment-friendly ecological bast fiber integrated wall decorating plate and a preparation method thereof. The bast fiber integrated wall decorating plate comprises a bottom layer, a middle layer and a surface layer which are sequentially overlapped and hot-pressed together. Both the bottom layer and the surface layer adopt polyester non-woven fabric layers, and the middle layer adopts a bast fiber felt layer. The bast fiber felt layer is formed in the mode that two or more pieces of precast and formed bast fiber felt are overlapped and preheated, the precast and formed bast fiber felt is mixed fiber felt with bast fibers and polypropylene fibers, and the bast fibers and the polypropylene fibers in the mixed fiber felt are both coiled fibers. The preparation method of the integrated wall decorating plate comprises the steps that the middle layer is manufactured; the polyester non-woven fabric layers are taken as the bottom layer and the face layer; and the bottom layer, the middle layer and the face layer are overlapped, heated and subjected to rolling forming, and the bast fiber integrated wall decorating plate is prepared after cutting. The wall decorating plate is environmentally friendly and ecological.

The invention provides a preparation method of a plant straw plate. The preparation method takes full components of dried corn straws, rice straws, wheat straws, sunflower straws, rapeseed straws and cotton straws as raw materials and utilizes a special adhesive of polyether polyol and a prepolymer of isocyanate, so that the water-resisting capability is strong, and the inner bonding intensity of a product is improved; the related indexes of the produced plant straw plate are equal to or better than quality standards of national standards (GB/T4897-92) of a wood artificial plate. The indexes including the inner bonding intensity, the static bending strength, the formaldehyde releasing amount, the water absorption thickness expansion rate and the like. The production process is simplified and the production cost is reduced.

A polyolefin synthetic pulp comprising a polyolefin resin graft-modified with an unsaturated carboxylic acid or a derivative thereof, and/or a polyolefin resin composition which comprises an ethylene/alpha,beta-unsaturated carboxylic acid copolymer and a polyethylene resin. Further, there is provided a heat sealing paper comprising a base fiber layer whose at least one surface is laminated and integrated with a layer of the polyolefin synthetic pulp. This polyolefin synthetic pulp has a large breaking length and an excellent internal bond strength, and exhibits stable heat sealing and hot tack properties over a wide temperature range from low to high temperature. The polyolefin synthetic pulp is suitable to use in battery separators, molding fiberboards, heat sealing papers and the like. The heat sealing papers have excellent heat sealing properties, and are characterized by having a large breaking length and an excellent internal bond strength and by exhibiting stable heat sealing and hot tack properties over a wide temperature range from low to high temperature.

The invention relates to a preparation method of solid wood composite floor which uses compacted and hardened scientific wood skin as a surface layer. The preparation method of the solid wood composite floor comprises the steps of dyeing and drying a gum wood veneer and a poplar veneer, carrying out gum dipping and sealing on the wood skin with a ultrasonic vibration method, assembling the wood skin after the gum dipping is carried out on the wood skin, carrying out semi-solidification hot pressing on the wood skin through a curve mold high-frequency pressing machine, slicing or saw cutting technology square wood into wood skin, assembling the wood skin in the same direction according to required height, carrying out hot-pressing sealing, trimming deflashing, and sanding on the wood skin, surface hardness of painting-free floor manufactured and prepared by the technology wood skin composite raw material with a method for manufacturing solid wood composite floor can reach to more than 3 H, surface hardness of painted solid wood floor can reach to more than 6H, wear-resisting rotating speed can reach to more than 4000 revolutions per minute, cracking can not occur easily, durability of products is improved by more than one time, the service life of the floor is prolonged, and using field of the floor is widened.

The invention relates to an environment-friendly flame-retardant non-adhesive fiberboard of crop straw and a preparation method thereof. The fiberboard is prepared by the following steps that 1 ) wheat straw and sorghum straw are taken to be cut off correspondingly, and the wheat straw and the sorghum straw are soaked in water to obtain a softened material; 2 ) steam explosion is correspondingly carried out on the softened material to obtain wheat straw fiber and sorghum straw fiber; 3 ) nano calcium carbonate, nano zinc oxide are mixed with nano copper oxide, and modifying is carried out toobtain a modified additive A; nano zinc borate, the nano zinc oxide are mixed with the nano copper oxide, and modifying is carried out to obtain a modified additive B; 4 ) the wheat straw fiber and the sorghum straw fiber are mixed with the modified additive A to obtain a core layer mixture; the wheat straw fiber is mixed with the modified additive B to obtain a surface layer mixture; and 5 ) thecore layer mixture is taken as a core layer, the surface layer mixture is taken as a surface layer to be laid and pre-pressed to obtain a slab, after hot-pressing forming and post-treatment are carried out, the environment-friendly flame-retardant non-adhesive fiberboard is obtained. The fiberboard has no formaldehyde release and has good mechanical property, good anti-water, moisture-proof, anti-corrosion and antibacterial properties; and good in fireproof and flame-retardant effects, and suitable for popularization and application.

The invention discloses a method for preparing a maize straw board, which comprises the steps of dehydrating maize straws, cutting off the maize straws, compressing the maize straws into an isopycnic straw board-preparation raw material, drying the raw material, sieving the raw material into a coarse material and a fine material, spraying an adhesive, and performing hot press molding, wherein the weight percentage of the straws and the adhesive is 85-90: 10-15. The adhesive for preparing the board consists of 75 to 90 percent of urea-formaldehyde resin, 5 to 8 percent of ammonia water, 0.5 to 1 percent of polyvinyl alcohol, 6 to 12 percent of melamine, and 0.5 to 1 percent of ammonium chloride (weight proportion). The method is characterized by utilizing all components (peels, pulp and leaves) of the maize straws, adopting special equipment to directly compress the cut straws into the board-preparation raw material with the equidensity of between 0.8 and 1.0g/cm3, ensuring the same density of the raw material in sizing and pressing links of the board, improving the internal bonding strength of products, and also improving the utilization rate of the raw material and simplifying production technology so as to reduce production cost at the same time. The maize straw board has the advantages of adequate raw materials, low cost, high board quality, good biological degradability, and no pollution to the environment.

A technology for preparing the medium-or high-density thick fibreboard includes hot-pressing the raw fibreboard while spraying steam onto its one surface for 1-10 min, and vacuum sucking for removing condensed water for 5-40S. Its advantage is short hot-pressing time and high productivity.

The invention discloses a dual-component in-situ injection type polyasparagine bionic tissue adhesive and a preparing method thereof. The tissue adhesive is composed of a first polyasparagine component solution and a second polyasparagine component solution with different reactive functional groups. A first component is polyasparagine with a vinyl functional group, a catechol functional group anda hydroxyl functional group, a second component is polyasparagine with a sulfydryl functional group, a catechol functional group and a hydroxyl functional group, a solvent of the first component is ahydrogen peroxide solution, and a solvent of the second component is a horse radish peroxidase solution. The catechol functional groups in the first component and the second component have the marinemussel imitation adhesion characteristic and can have noncovalent interaction with a tissue surface, the adhesive has tissue adhesiveness, and tissue repairing is realized. The tissue adhesive has excellent tissue adhesive strength and use convenience and has important significance in replacing surgical sutures and healing wounds.

The invention relates to an isocyanate adhesive composition for a fiberboard and a routing fiberboard prepared from the isocyanate adhesive composition. The isocyanate adhesive composition comprises an isocyanate adhesive, a double-crown-layer silicon dioxide composite material and a lignin wood material. The routing fiberboard is formed by mixing separated fibers and the adhesive and performing hot press molding. The fiberboard prepared by using the adhesive provided by the invention has good routing performance, and the dimensional stability is better maintained.

The invention discloses a friction plate material and a preparation method thereof. The friction plate material comprises an enhanced type foam alloy framework and a packing material, wherein the enhanced type foam alloy framework comprises aluminum alloy powder, tungsten carbide and titanium hydride, and the packing material comprises modified fibers, phenolic resin, an abrasion-resistant modifying agent, kieselguhr, brass powder, graphite, carbon fibers and silicon dioxide. A friction plate prepared through the friction plate material and the preparation method provided by the invention has the characteristics of being small in friction coefficient, low in wear rate, high in strength and good in shock resistance; and the preparation method is simple, the production technological process is easy to operate, and the friction plate material and the preparation method thereof are suitable for large-scale popularization.

The invention relates to a method for making paper special for E-commerce. The method includes the steps of beating, pulp mixing, accessory adding, wet paper sheet making, predrying, surface sizing, postdrying, calender finishing and the like conducted on softwood pulp and hardwood pulp; the fixed quantity of the made paper special for E-commerce is 60 g/m<2>, moisture is 5-6%, raw white or ISO whiteness is 100%, tensile strength is larger than or equal to 4.0 KN/m, internal bond strength is larger than or equal to 400 J/m<2>, the ash content is smaller than or equal to 15%, the average value of smoothness is larger than or equal to 100 S, water absorption stability is 20-25 g/m<2>, a long broken roll of paper is larger than 7000 m in the longitudinal direction, transverse folding strength is larger than or equal to 15 times, and the transverse ratio of expansion and contraction is smaller than or equal to 3.0%; high yield pulp is not contained; the paper is good in evenness, fine in appearance, good in flatness and good in touch handfeel.

The invention relates to the technical field of sculpture material preparation and particularly relates to a preparation method of a high-strength water-proofing clay sculpture material. In the method, orthosilicic acid precipitate is mixed with quick lime to obtain a paste mixture, and flax straw and the paste mixture are soaked and fermented for a long time, so that the flax straw is mildewed, wherein grass tendon, which is high in toughness and strength, remain and is precipitated with the lime; the materials are heated and boiled so that the orthosilicic acid precipitate is heated and decomposed to generate nano SiO2 which is packed in the slurry, wherein the high-strength nano SiO2 can further increase the mechanical strength of cured and shaped slurry so as to finally obtain self-made tendon slurry which has very high viscosity and high strength; then clay mineral kaolin is blended with flour and castor oil to perform fermentation, so that castor oil is degraded to generate estergroups under effect of microorganisms, finally the ester groups are introduced to the surface of kaolin for improving the hydrophobicity and water resistance of clay to fially produce the high-strength water-proofing clay sculpture material, which has broad application prospect.

The invention relates to a method for preparing a modified urea resin. During the production process of urea resin, a small molecule methyl silanol aqueous solution which accounts for 0.4 percent to 30 percent of the total feeding amount by weight is added into raw material to carry out modification; or a small molecule methyl silanol aqueous solution with weight percentage of 0.4 percent to 30 percent is directly added into and mixed with the prepared urea resin. The method achieves the purpose of reducing formaldehyde release through changing the molecule structure and controlling the existence of free formaldehyde and methylene ether link and can also improve the resistance to water, weather and aging resistance and bonding strength of the urea resin.

The invention discloses a production method of epoxy resin-based thermal-conductive insulating paste, and belongs to the technical field of high-polymer materials. The production method of the epoxy resin-based thermal-conductive insulating paste comprises the steps of sequentially weighing the components in parts by weight: 60-80 parts of epoxy resin, 30-40 parts of a diluent, 5-8 parts of a silane coupling agent KH-550, 10-20 parts of an additive and 10-12 parts of a curing agent, mixing the epoxy resin and the diluent in a stirrer, adding the additive and the silane coupling agent into thestirrer, under conditions of temperature of 30-50 DEG C and rotating speed of 300-400 r/min, conducting stirring and mixing for 30-50 min to obtain a mixed blank, mixing the mixed blank and the curingagent, under conditions of temperature of 30-60 DEG C and rotating speed of 300-350 r/min, conducting stirring and mixing for 20-50 min, and then under a condition of temperature of 150-180 DEG C, conducting heating and curing for 30-60 min to obtain the epoxy resin-based thermal-conductive insulating paste.