99results about How to "Small water absorption" patented technology

The invention discloses a low-loss resin composition, which is prepared from the following main components in parts by weight: 10 to 90 parts of acenaphthylene-p-vinylbiphenyl copolymer, 10 to 70 parts of cross-linking agent, 20 to 60 parts of elastomer, 0.1 to 3 parts of initiator and 10 to 90 parts of filler. The acenaphthylene-p-vinylbiphenyl copolymer is obtained by pre-polymerizing acenaphthylene and divinylbiphenyl, the acenaphthylene monomer residue is less, the acenaphthylene monomer is difficult to volatilize in a resin system, implosion caused by too fast curing reaction of the resin system is prevented while good reaction activity is maintained, and a subsequent curing product is high in crosslinking density and good in heat resistance; a machining window is wide, and subsequent production and machining are facilitated; and an acenaphthylene structure has high symmetry and rigidity and does not contain elements such as oxygen, sulfur and nitrogen, so that the resin composition has excellent dielectric properties and thermal properties and a low thermal expansion coefficient, and an elastomer as a cross-linking curing matrix material can provide the characteristics of low dielectric constant, low dielectric loss, low water absorption and the like.

The invention provides a sodium ferric phosphate pyrophosphate composite material, a preparation method and application thereof, and a sodium ion battery, and relates to the technical field of positive electrode materials, the preparation method comprises the following steps: carrying out solid phase mixing on carbon-coated sodium ferric phosphate pyrophosphate and an organic carbon source, and then carrying out sintering treatment to obtain the sodium ferric phosphate pyrophosphate composite material; the temperature of the sintering treatment is 400-580 DEG C. The technical problems that in the prior art, according to a carbon source coating method, carbon source coating is not uniform, the porosity between materials is difficult to effectively reduce, the compaction performance of the materials cannot be remarkably improved, and the crystal structure of the materials is prone to change are solved, and the purposes of reducing the powder resistance of the materials and improving the compaction performance of the materials are achieved. The carbon coating uniformity is effectively improved, the porosity of the material is effectively reduced, the compaction performance of the material is remarkably improved, the water absorption of the material is reduced, and the crystal structure of the material is improved, so that the technical effect of comprehensively improving the performance of the material is achieved.

The invention provides a self-healing modified binder for a silicon negative electrode of a lithium battery as well as a preparation method and application of the self-healing modified binder. The self-healing modified binder at least comprises tannic acid, polyacrylic acid and a modified nano silicon dioxide composite material. The self-healing modified adhesive has rich dynamic hydrogen bonds among molecules, and is combined with a doped modified nano silicon dioxide composite material, so that the hydrophobicity of the self-healing modified adhesive is improved, and meanwhile, the self-healing modified adhesive is endowed with excellent self-healing performance, so that the self-healing modified adhesive can quickly recover the integrity when subjected to mechanical damage, and the service life of the self-healing modified adhesive is prolonged. Therefore, the problem of poor battery performance caused by volume expansion of the silicon negative electrode in the charging and discharging process is effectively solved.

The invention provides a preparation method and application of a novel cross-linked polyarylpyridine anion exchange membrane, and the preparation method comprises the following steps: using one or more aromatic compounds as a polymer monomer main chain, and condensing with 4-acetylpyridine under the catalytic action of superacid to obtain a polymer intermediate; a quaternary ammonium salt alkenyl compound is introduced as a crosslinking agent, and crosslinking is completed by heating in the film forming process. The introduction of the novel cross-linking agent is beneficial to the construction of a two-dimensional membrane structure and can improve the mechanical properties of the anion exchange membrane, the heating cross-linking condition is beneficial to the rapid adjustment of the cross-linking degree of the ion exchange membrane and the reduction of the swelling coefficient of the ion exchange membrane during use, and the quaternary ammonium salt alkenyl compound is beneficial to the construction of an ion exchange channel and the reduction of the membrane resistance. The ion flux is improved; the anion exchange membrane has excellent spatial size stability and membrane framework stability, strong oxidation reduction resistance, strong flexibility, long service life and the like, and can be applied to the fields of flow batteries and the like. # imgabs0 #

The invention relates to the technical field of nylon materials, and discloses a low-moisture-absorption nylon composite material and a preparation method thereof. The nylon composite material prepared by the invention is prepared from the following raw materials in parts by weight: 40-50 parts of nylon 66, 35-55 parts of modified nylon 6, 25-35 parts of reinforcing filler, 0.5-2 parts of a lubricant and 0.5-1 part of an antioxidant, the nylon 66 / modified nylon composite material is prepared by taking nylon 66 and modified nylon 6 as substrate materials, adding auxiliaries such as reinforcing filler, mixing, extruding and granulating, the modified nylon 6 is introduced, so that the toughness of the composite material is improved, and the water absorption rate is reduced; due to the introduction of the reinforcing filler, the synergistic effect of halloysite and boron nitride can be utilized, the flame retardant property of the composite material is improved, and the water absorption rate is further reduced.

The invention belongs to the technical field of underwater construction materials, and particularly relates to a self-leveling anti-dispersion underwater bottom sealing material and a preparation method thereof. The self-leveling anti-dispersion underwater bottom sealing material disclosed by the invention is prepared from the following components in parts by weight: 530 to 730 parts of sulphoaluminate cement, 77 to 277 parts of ordinary Portland cement, 84 to 126 parts of fly ash, 870 to 950 parts of fine aggregate, 250 to 278 parts of water, 18 to 23 parts of a water reducing agent, 6 to 10 parts of a flocculating agent, 8 to 12 parts of a retarder, 0.9 to 1.4 parts of a de-foaming agent and 0.1 to 0.4 part of an early strength agent. The self-leveling dispersion-resistant underwater bottom sealing material disclosed by the invention has good fluidity and dispersion resistance.

The invention discloses a preparation method and a use method of bleeding inhibition microspheres for concrete. The preparation method of the bleeding inhibition microspheres for the concrete comprises the following steps: (1) performing ultrasonic dispersion on alkali-soluble polyester fibers, lauryl sodium sulfate and water to obtain a mixed solution A; (2) dissolving high-modulus sodium silicate in water, adding the steel slag micro powder, and uniformly stirring to form a turbid liquid B; (3) mixing the mixed solution A, the turbid liquid B and sodium alginate to form a mixed solution D; (4) reacting the mixed solution D with an excessive calcium nitrate solution, and filtering to obtain gel microspheres; (5) adding excessive sodium citrate solution into the gel microspheres, dissolving and filtering to obtain particles; and (6) reacting the particulate matters with a sodium hydroxide solution, and filtering to obtain the bleeding inhibition microspheres. When the bleeding inhibition microspheres are added into concrete, bleeding of the concrete can be obviously reduced, the fluidity and cohesiveness of a concrete mixture are improved, and the mechanical property and the volume stability of the concrete are improved.

The invention discloses an aerogel thermal insulation mortar and a preparation method thereof, which belong to the technical field of thermal insulation mortars. The aerogel thermal insulation mortar comprises the following raw materials in parts by weight: 70-75 parts of silicate cement, 18-22 parts of fly ash, 3-7 parts of slaked lime, 1-1.4 parts of cellulose ether, 1.8-2 parts of redispersible latex powder, 0.8-1 parts of polypropylene fiber, 1.4-1.6 parts of sodium methyl silicate, 90-100 parts of modified silicon microspheres, and 190-200 parts of water. The aerogel thermal insulation mortar is prepared by the following steps: firstly, silicate cement, fly ash, slaked lime, cellulose ether, redispersible latex powder, polypropylene fiber, sodium methyl silicate and modified silicon microspheres are added into a mixer, stirred and mixed to obtain powder, and water is added into the powder, stirred and mixed to obtain the aerogel thermal insulation mortar. The thermal insulation mortar of the invention improves the compressive strength of the thermal insulation mortar and reduces the thermal conductivity, water absorption and production cost of the thermal insulation mortar through reasonable addition of the modified silicon microspheres.

The invention belongs to the technical field of optical cable cross-connecting boxes, and particularly relates to a rainwater-proof communication optical cable cross-connecting box which comprises a box body, an exhaust fan is arranged on the side face of the box body, a protection frame is fixedly connected to the upper surface of the box body, the upper surface of the protection frame is an acrylic plate made of a transparent material, and a solar cell panel is arranged below the protection frame. A rotating mechanism is arranged on one side of the protection frame, a lightning protection mechanism is further arranged on the upper surface of the box body, and an evaporation mechanism is arranged in the box body. According to the communication optical cable cross-connecting box, the exhaust fan, the silica gel beads and the ceramic blocks are arranged, when the communication optical cable cross-connecting box is used in an area with a large temperature difference, it can be guaranteed that water vapor generated by the temperature difference in the box body is absorbed by the silica gel beads, the interior of the box body is kept dry, and after the water absorption of the silica gel beads is reduced, water in the silica gel beads is evaporated through heating of the ceramic blocks; and the silica gel beads are extracted by the exhaust fan, so that the silica gel beads can be repeatedly used, and frequent replacement of the silica gel beads is avoided.

The invention relates to a polypropylene composition as well as a preparation method and application thereof. The polypropylene composition comprises 39-66 parts of polypropylene resin, 2-6 parts of a compatilizer, 3-8 parts of a bamboo fiber filler, 5-13 parts of a glass fiber filler and 0-5 parts of a processing aid. The polypropylene composition is suitable for being co-extruded with nylon to prepare a pipe, and the interlayer binding force between the polypropylene composition and a nylon interface is effectively improved by utilizing the characteristic that hydroxyl groups of the bamboo fiber filler in the polypropylene composition and nylon form hydrogen bonds and matching of the glass fiber filler.

The invention discloses an autoclaved aerated concrete material and a preparation method thereof, and belongs to the technical field of novel building materials. The graphene oxide loaded calcium carbonate and the graphene oxide are added into the material provided by the invention, nucleation sites generated by the graphene oxide loaded calcium carbonate cause a deep microstructure of the material to directionally generate a fiber-like nanoneedle-shaped multi-stage micro-nano structure, and nanowires are split from tips of the nanoneedle-shaped structure and are filled in capillary pores and microscopic pores, so that the nanowires are uniformly dispersed in the micro-pores and the micro-pores; the appearance of a meniscus is effectively avoided, the compactness is increased, the pressure of capillary pores can be further dispersed by the nanowires, and the pressure difference of the capillary pores is reduced, so that drying shrinkage is avoided. The graphene oxide ions can reduce the gravitation between the colloidal particles and block the distance between the particles, so that drying shrinkage is further avoided. Therefore, the material provided by the invention can effectively solve the cracking problem caused by drying shrinkage, the durability of the material is improved, and the service life of the material is prolonged.

The invention belongs to the field of polymer water lubrication materials, and provides a fluorine-containing polyurethane water lubrication composite material, a preparation method and a bearing, a dihydroxyl-terminated perfluoropolyether monomer and a polyurethane prepolymer are adopted to prepare a fluorine-containing polyurethane prepolymer, so that a fluorine-containing group is introduced into polyurethane, polytetrafluoroethylene micro powder is added, and the fluorine-containing polyurethane water lubrication composite material is prepared. The fluorine-containing polyurethane water lubrication composite material which can be used for bearing manufacturing is prepared; according to the fluorine-containing polyurethane material provided by the invention, the dihydroxyl-terminated perfluoropolyether monomer is introduced into the polymer, so that the problem that agglomeration is easy to occur when polytetrafluoroethylene is added is solved, and the water resistance and the wear resistance are also improved.

The dicyandiamide-cured ricinoleic acid modified epoxy glue is prepared from the following components in parts by weight: 80 to 100 parts of ricinoleic acid modified epoxy resin, 10 to 40 parts of a core-shell structure rubber toughening agent, 5 to 15 parts of dicyandiamide, 0.1 to 5 parts of a curing accelerator, 0.1 to 1 part of an antioxidant, 0.1 to 4 parts of a coupling agent and 1 to 100 parts of filler, the ricinoleic acid modified epoxy resin is prepared by reacting 10 to 40 parts of ricinoleic acid, 80 to 100 parts of epoxy resin and 2 to 10 parts of diisocyanate. According to the dicyandiamide cured ricinoleic acid modified epoxy glue, hydrophobic ricinoleic acid is used for grafting and modifying epoxy resin, polyurethane is introduced to enhance the hydrogen bond effect so as to improve cohesion, meanwhile, the water resistance and peel strength of the epoxy glue are improved, and the dicyandiamide cured ricinoleic acid modified epoxy glue is used as a single-component latent epoxy glue with excellent performance.

The invention discloses high-gram-weight transfer paper, and relates to the technical field of aluminized transfer paper. The high-gram-weight transfer paper comprises a bottom paper layer, a laser transfer film and an adhesive layer bonded between the bottom paper layer and the laser transfer film, the adhesive layer adopts a double-component polyurethane adhesive, and the double-component polyurethane adhesive comprises a component A and a component B; the component A comprises the following raw material components: castor oil and a diisocyanate monomer; the component B is prepared from the following raw material components: polyether polyol, polyepichlorohydrin, a diisocyanate monomer, fumed silica, trimethylolpropane and N-(2-aminoethyl)-3-aminopropyltrimethoxysilane; the high-gram-weight transfer paper disclosed by the invention is relatively good in folding resistance and scratch resistance, and the adhesion fastness of the laser transfer film on the bottom paper layer is relatively good.

The invention relates to hydrophobic nanocellulose aerogel and a preparation method thereof, and belongs to the technical field of aerogel. The aerogel is prepared by sequentially carrying out co-hydrolysis, gelation and freeze drying on nanocellulose, a silicon-based hydrophobic regulating agent and tetraethoxysilane, the silicon-based hydrophobic regulating agent is substituted and etherified by undecylenol and active chlorosilane in perfluorododecyl trichlorosilane molecules, and an alkyl chain of a branched terminal alkenyl is introduced to prepare an intermediate, and the intermediate is subjected to freeze drying to prepare the aerogel. Then gamma-mercaptopropyltriethoxysilane and terminal alkenyl of the intermediate are subjected to ultraviolet-initiated addition, multiple ethoxysilane is introduced for modification, a silicon-based hydrophobic regulating agent and tetraethoxysilane are subjected to co-hydrolysis, and then the product is coupled with hydroxyl on a nano-cellulose macromolecular chain, so that the water absorption of nano-cellulose molecules is effectively reduced; the introduction of the fluorine structure greatly reduces the surface energy of the pore wall of the aerogel, and the pores of the aerogel are tiny, so that the aerogel is difficult to infiltrate by water under surface tension, and the aerogel has excellent hydrophobicity.

The present invention discloses a composite wall insulation block with low thermal conductivity and a preparation method thereof, which relates to the technical field of composite wall insulation blocks, and includes a recycled concrete block, a heat preservation groove is provided in the middle of the top of the recycled concrete block, an aerogel heat preservation material is installed on the inner wall of the heat preservation groove, a plurality of cavities are provided on the outer side of the top of the recycled concrete block, a foamed ceramic plate is installed on the inner wall of the cavity, and connection holes are provided at the four corners of the top of the recycled concrete block. The present invention adds aerogel heat preservation material and foamed ceramic plate into the heat preservation groove and the cavity through the arrangement of recycled concrete blocks, heat preservation grooves and cavities, the aerogel heat preservation material has low thermal conductivity, is waterproof and non-flammable, and also has the effects of sound insulation and shock absorption, and the foamed ceramic plate has low thermal conductivity and non-combustion effects, thereby being able to reduce the thermal conductivity of the heat preservation block and improve the fire prevention and heat preservation effects.

The present application provides an aerogel thermal insulation putty paste, the raw materials of which include: by weight, 13-50 parts of emulsion, 30-70 parts of aerogel paste, 5-30 parts of filler, 0.1-2 parts of leveling agent, 0.1-3 parts of adhesion promoter, 0.1-1 parts of defoaming agent, 0.1-1 parts of bactericide, 0.1-1 parts of wetting dispersant, and 5-20 parts of water; the present application uses a high-density aerogel paste, and the prepared putty paste has excellent thermal insulation performance and flame retardant performance; at the same time, the mechanical strength of the putty paste is enhanced by using an emulsion with a high Tg value, and the flexibility of the cross-linking system of the putty paste is coordinated by compounding different emulsions to avoid cracking or powdering of the putty paste after curing, and the prepared putty paste has excellent bonding strength, fire resistance, hydrophobicity and construction performance.

The present invention relates to the technical field of building materials (IPC classification number is C04B28 / 04), and in particular to a high-temperature resistant inorganic artificial stone and a preparation method thereof, comprising an inorganic artificial stone substrate and a high-temperature resistant heat-insulating coating coated on the surface of the inorganic artificial stone substrate. In the present invention, the simultaneous addition of fillers, coupling agents, and expansion agents can form chemical bonds between cement gel products and fibers, can enhance the bonding force between fibers and aggregates and cement, improve the flexural strength and toughness of the board, resist high-temperature deformation and cracking of the board, and the addition of thickeners makes the board have higher conjunctival strength and adhesion, can improve the density of the board, and improve the working performance of the board. The surface heat-resistant temperature of the prepared inorganic artificial stone can reach 300-400°C, which broadens the application range of the inorganic artificial stone.

The invention relates to the technical field of preparation of insulating materials, in particular to a hydrophobic modified heterocyclic aramid-based insulating film, a preparation method and application. According to the method, a heterocyclic aramid polymer with high breakdown strength and high heat resistance is prepared to serve as a base material, hydrophobic long-chain alkane is grafted through active sites on imidazole of heterocyclic aramid, and the hydrophobic modified heterocyclic aramid-based insulating film is obtained. The heterocyclic aramid is endowed with hydrophobic performance on the basis of flame retardance, temperature resistance, excellent mechanical strength and high breakdown strength of the heterocyclic aramid, and the high-strength, high-modulus, heat-resistant and hydrophobic heterocyclic aramid-based insulating film is successfully prepared. The insulating property of the film is doubly enhanced under the action of imidazole in the film and the assistance of a surface hydrophobic function, and the method is simple and has important significance in application of the heterocyclic aramid insulating material in complex scenes. The problems of poor hydrophobicity and insulativity of a heterocyclic aramid film in the prior art are solved.

The invention discloses a low-water-absorptivity high-temperature-resistant lithium battery diaphragm and a preparation method thereof, the low-water-absorptivity high-temperature-resistant lithium battery diaphragm comprises a base membrane and a coating on the base membrane, and the coating comprises porous ceramic and nano ceramic. The nano-ceramics are well filled among the porous ceramics, so that the permeation path of moisture is reduced, and the water absorption of the diaphragm is reduced, thereby improving the safety and cycling stability of the lithium battery; the diaphragm has good high-temperature resistance due to good compactness of the coating, so that the diaphragm can be kept stable in a high-temperature environment, and risks of diaphragm shrinkage, melting and even combustion caused by temperature rise are reduced, so that the overall safety of the battery is improved, and the service life of the battery is prolonged.

The invention discloses a biochar-based coated selenium slow-release fertilizer and a preparation method thereof, and belongs to the technical field of fertilizers. The fertilizer comprises a core layer and a coating layer coated on the surface of the core layer, and the raw materials of the core layer comprise the following components by mass: 70-80 parts of urea, 60-70 parts of monoammonium phosphate, 50-60 parts of potassium chloride, 30-40 parts of superphosphate, 2-3 parts of sodium silicate, 2-4 parts of magnesium sulfate, 8-15 parts of nano-selenium, and 4-6 parts of tourmaline powder; the raw materials of the coating layer comprise the following components: 120-150 parts of modified biochar powder, and 20-30 parts of modified starch / polyvinyl alcohol composite. The fertilizer has good slow-release effect, high utilization rate of selenium element, good fertilizer efficiency, can effectively improve the yield and quality of crops, and has a simple preparation process, low cost, and no pollution.

The invention provides a preparation method of bio-based composite polylactic acid fibers, and relates to the field of biomass conversion materials and composite polylactic acid fibers.The flexible hydrogen conveying pipe is prepared from polylactic acid, polyester fibers, graphene fibers, natural plant fibers, jasmine extract, carbodiimide, triacetic acid and acetyl tributyl citrate. The natural plant fibers comprise linen fibers, natural corn fibers and wormwood fibers which are microfibers; according to the preparation method disclosed by the invention, the interface compatibility of the natural plant fibers and the polylactic acid is improved after the natural plant fibers are integrally modified, the physical and mechanical properties of the finally prepared bio-based composite polylactic acid fiber material are enhanced, and various properties of the prepared bio-based composite polylactic acid fiber material are in higher standards in the composite polylactic acid fibers.

The utility model discloses an outdoor composite floor and support connection structure, which comprises a plurality of support keels, the top of each support keel is provided with a mounting groove, the top of each support keel is adjacently provided with a composite floor, the two side surfaces of each composite floor are provided with fixing grooves, the top surface of each composite floor is provided with a drainage groove, and the drainage grooves are communicated with the mounting grooves. The composite floors are installed on the tops of the supporting keels through fixing pieces, the adjacent composite floors are connected through the fixing pieces, the outdoor composite floor is formed through extrusion molding, the hardness is large, the acid-base performance and the corrosion resistance are excellent, the water absorption is small, and the rigidity and the bearing performance are larger than those of other floors; the grooves formed in the lower surface of the composite floor can reflect heat emitted by the ground, so that the thermal expansion and cold contraction performance is smaller than those of steel and all-plastic materials, extrusion molding is achieved, the machinability is better than those of wood, steel, plastic and other materials, installation is convenient, and the later maintenance cost is low.

The invention relates to low-water-absorption artificial stone unsaturated polyester resin and a preparation method thereof, and belongs to the technical field of unsaturated polyester resin. The reaction raw materials comprise the following components in parts by weight: 8 to 15 parts by weight of phthalic anhydride, 20 to 30 parts by weight of maleic anhydride, 22 to 38 parts by weight of hydroxypivalate neopentyl glycol ester, 4 to 12 parts by weight of propylene glycol, 6 to 12 parts by weight of ethylene glycol, 0.005 to 0.01 part by weight of a reaction stage polymerization inhibitor, 0.005 to 0.015 part by weight of a reaction stage antioxidant, 5 to 10 parts by weight of benzyl alcohol, 0.004 to 0.008 part by weight of a cooling stage polymerization inhibitor and 0.015 to 0.025 part by weight of paraffin. 40 to 45 parts by weight of a cross-linking agent and 0.003 to 0.005 part by weight of a dilution stage polymerization inhibitor. The unsaturated polyester resin is used in the field of artificial stone products, and has the characteristics of low water absorption, high dispersion, thermal stability, excellent performance and low possibility of deformation.

The invention discloses acrylic resin and a preparation method thereof, and relates to the field of acrylic resin, and the acrylic resin comprises 45-70 parts of a monomer, 5-20 parts of allyl benzyl ether, 1-3 parts of an initiator and 1-2 parts of a chain transfer agent. The acrylic resin with narrow molecular weight distribution is prepared by selecting monomer types and combining with the allyl benzyl ether and the compounded chain transfer agent as raw materials, and the water resistance and weather resistance of the thermal insulation coating prepared from the acrylic resin are improved.

The invention discloses a wood veneer treatment system and a wood veneer treatment method. The system comprises a carbonization furnace used for heating and carbonizing wood veneers; the belt conveyor is used for conveying carbonized veneers; the first spraying device is arranged at the first station and used for spraying chemicals to the veneers located on the surface of the belt conveyor; the first drying device is arranged at the second station and is used for drying the medicament on the surface of the veneer; the turn-over mechanism is arranged at the third station and used for picking up the veneers conveyed from the second station, turning over the veneers and placing the veneers on a belt conveyor so as to convey the veneers to a fourth station; the second spraying device is arranged at the fourth station and used for spraying chemicals to the veneers conveyed from the third station; and the second drying device is arranged at the fifth station and used for drying the medicament on the surface of the veneer conveyed by the fourth station. When the system is used and combined with the method for processing the wood veneer, various attributes of the wood veneer can be effectively improved.

The invention discloses a polyamide material for a light high-strength safety airbag shell and a preparation method of the polyamide material, and belongs to the technical field of modified polyamide materials. Comprising the following raw materials in parts by mass: 80-120 parts of modified polyamide resin, 10-15 parts of carboxylated lignin, 5-10 parts of modified potassium hexatitanate whiskers, 4-5 parts of silk fibroin, 1-2 parts of an antioxidant, 1-1.4 parts of a coupling agent, 1-1.5 parts of a lubricant, 0.5-0.9 part of a nucleating agent and 60-80 parts of deionized water. The potassium hexatitanate whisker is used as a carrier of the zinc-based metal organic framework, so that the impact resistance of the zinc-based metal organic framework is improved, the impact energy required by hole collapse and zinc-nitrogen bond breakage of the zinc-based metal organic framework is increased, and the injury to personnel caused by larger impact force when the safety airbag is started to pop off a polyamide shell material is avoided; the cucurbit [6] uril is grafted on a polyamide molecular chain, and a hydrophobic group is introduced on the polyamide molecular chain, so that the water absorption of the polyamide resin is reduced.

The invention belongs to the technical field of adhesive preparation, and particularly relates to a preparation method of a starch adhesive for corrugated paper. The preparation method of the starch adhesive for the corrugated paper comprises the following steps: carrying out oxidation treatment on the starch to prepare a first reactant; adding water into the first reactant, uniformly mixing, then adding a sodium hydroxide solution, continuously reacting for 50-55 minutes, finally adding phosphorus oxychloride and dialdehyde starch, and reacting at 38-40 DEG C for 2.3-2.5 hours to prepare a second reactant; adding furfural, m-cresol and salicylic acid into the second reactant to carry out copolymerization reaction, finally adding poly (hydroxyethyl methacrylate) and vinyl acetate acrylate copolymer, and uniformly stirring to prepare the starch adhesive for corrugated paper. The starch adhesive for corrugated paper prepared by the method has excellent bonding strength and stability.

The invention relates to the technical field of marine ropes, in particular to a wheel barge mooring rope inserting method, eight strands of mooring ropes and twelve strands of mooring ropes are inserted in two directions, the eight strands of mooring ropes are made of polypropylene filament yarn or yellow polyester, the twelve strands of mooring ropes are made of ultra-high molecular weight polyethylene, and the two kinds of mooring ropes give full play to respective advantages after being inserted. The cable made of the polypropylene filament yarn and the yellow polyester acrylic material is low in price, high in density and large in elasticity, the cable made of the ultra-high molecular weight polyethylene material is high in price, low in density, small in elasticity, high in strength and resistant to abrasion, the cable formed by inserting the eight-strand cable and the twelve-strand cable has very high breaking strength and is light and fast to use as a working cable, the breaking probability is reduced, and the service life of the cable is prolonged. And by adopting the cable inserting method, inserting is convenient, consumed time is short, consumables are few, and cost is saved. In addition, the mooring rope inserted by adopting the mooring rope inserting method is low in water absorption and light, the labor intensity of personnel is relieved, and the working efficiency and safety of the personnel are improved.

The invention relates to the technical field of packaging materials, in particular to a bio-based polyamide film for aluminum-plastic film packaging and a preparation method of the bio-based polyamide film. The film comprises a coating layer and a bio-based polyamide base material layer, the coating layer is formed by coating the surface of the bio-based polyamide base material layer with acrylic acid coating liquid, and the acrylic acid coating liquid comprises organic silicon modified acrylic resin, polyurethane microspheres, an aziridine cross-linking agent and water; the bio-based polyamide base material layer is composed of three layers of biaxially oriented bio-based polyamide films, and bio-based PA56 and bio-based PA5X in each layer are formed according to a certain proportion. The bio-based PA56 and the bio-based PA5X are cooperatively used and are matched with the acrylic acid coating liquid, so that the stretching ratio of the thin film is reduced, the strength, the toughness and the wear resistance of the thin film are ensured, the electrolyte resistance is improved, and the high pit flushing property of a flat film method is realized.