1434results about How to "Small water absorption" patented technology

An ultrahigh-strength active powder concrete is a mixture prepared by mixing the following materials according to weight portion: 1000 portions of Portland cement, 600-1400 portions of quartz sand, 90-400 portions of siliceous dust, 200-400 portions of silicon powder, 100-300 portions of quartz powder, 80-350 portions of high-strength steel fiber, 15-30 portions of high-efficiency water reducing agent, 250-320 portions of water, 60-120 portions of AEA expanding agents, 0-15 portions of latex powder, 0-10 portions of polyester fiber and 0-2 portions of antifoam agents. The preparation method comprises the following steps: preparing the materials according to the weight proportion, firstly mixing water, cement, quartz sand, siliceous dust, silicon powder, quartz powder, AEA expanding agents, high-efficiency water reducing agent, latex powder, polyester fiber, and antifoam agents into pasty state; then adding high-strength steel fiber, and mixing for 4-6 minutes. The prepared active powder concrete has super-high compressive and bending strengths, high mechanical property and high durability.

The invention provides a corrosion-inhibiting anionic intercalated hydrotalcite/nano oxide composite material, a preparation method thereof and application of the corrosion-inhibiting anionic intercalated hydrotalcite/nano oxide composite material. The preparation method is as follows: corrosion-inhibiting anions are directly inserted between hydrotalcite layers by the one-step coprecipitation method and the roasting restoring method; the nano oxide is generated by means of in situ synchronization during the process of generation of hydrotalcite crystals by controlling the mixture ratio of divalent metal ions to trivalent metal ions, the pH value of a reaction solution and the reaction temperature; and the corrosion-inhibiting anionic intercalated hydrotalcite/nano oxide composite material with the anti-corrosive function is prepared. The invention is mainly characterized in that the in situ preparation method for the hydrotalcite/oxide composite material provided with a nano lamellar structure improves the release amount of a corrosion inhibitor and reduces the water absorption of a coating by leading into the corrosion inhibitor with the anti-corrosive function and the nano oxide which is generated in situ during the reaction process. The composite material can be used to be pigment of an anti-corrosive metallic coating system, and particularly has potential application value in improving the anti-corrosive performance of a magnesium alloy anti-corrosive coating.

This invention discloses a thermoset crylic acid latex and its preparation method and a corrosion resistant bottom coat containing such latex and used in the Al fins of the heat converter of air conditioners, in which, said latex includes a crylic acid kind monomers, an ionic vinyl monomers, an ethene monomers, a vinyl silane coupler, a crosslink monomers, a surface active agent and an initiator to be got by seed latex and semi-continuous drop technology. Said bottom coat includes said thermoset crylic acid latex, water-base coating resin, water-base cross-linker, booster solvent, neutralization agent, a water-base adhesive force accelerant, a catalyst and water.

The invention discloses a solvent-free polyurethane adhesive for a composite film, which consists of an A component and a B component, wherein the A component is end-OH polyester polyol, and the B component is end NCO-polyurethane prepolymer; and the A component and the B component are mixed in the molar ratio of functional groups of NCO to OH being 1.2-1.9:1.0. The polyurethane adhesive for the composite film does not need to adopt solvent and has high safety. The adhesive shows low hydroscopic property as well as low hydrolysis and high shock strength due to introducing dimeric dibasic acid, and shows good adhesive property for some substrates which are particularly difficult to adhere and attach. The invention improves the adhesive strength of the composite film through the design of compositions and a molecular structure of the adhesive, the T peeling strength reaches more than 3.8N/15mm after the plastic films are compounded for 3 to 5 days, and the T peeling strength between the plastic and an aluminum-plating film reaches more than 4.2N/15mm.

The invention relates to an epoxy resin composition and a high-frequency circuit board manufactured thereby. The epoxy resin composition comprises the following solid components: (A) cyanate compound or prepolymer thereof, wherein the molecule of the cyanate compound contains at least two cyanato groups; (B) active ester; and (C) epoxy resin containing a naphthol structure; calculated in solid component in parts by weight, the total amount of the component (A), i.e. the cyanate compound containing at least two cyanato groups in the molecule thereof or the prepolymer thereof, and the component (B), i.e. active ester, is 10-70 parts by weight, and the amount of the component (C), i.e. epoxy resin containing naphthol structure, is 30-90 parts by weight, wherein the weight ratio of the component (A), i.e. the cyanate compound containing at least two cyanato groups in the molecule thereof or the prepolymer thereof, to the component (B), i.e. active ester, is (0.2-5):1. The high-frequency circuit board manufactured by using the epoxy resin composition of the invention comprises a plurality of layers of prepregs which are overlapped mutually, and copper foils which are compressed on the two sides respectively; and each of the plurality of layers of prepregs comprises a base material and the epoxy resin composition which is adhered to the base material through impregnation and drying.

The invention relates to a novel modified non-woven fabric lithium-ion battery diaphragm. The diaphragm comprises a modified non-woven fabric base material and a filling agent compounded on the modified non-woven fabric base material, wherein the modified non-woven fabric base material comprises a low-smelting-point material and a high-smelting-point material; the low-smelting-point material is subjected to melt crystallization treatment and the weight of the high-smelting point material accounts for 85-99.9% of the total weight of the base material; the residual amount is the low-smelting point material; the filling agent compounded on the modified non-woven fabric base material comprises organic polymer, a first filling material and/or a second filling material. The invention further relates to a preparation method of the battery diaphragm. The preparation method sequentially comprises the following steps: manufacturing a non-woven fabric fiber layer; manufacturing the modified non-woven fabric base material; preparing filling agent slurry; filling; removing a solvent; and carrying out post-treatment. The method is simple in operation and low in cost; a prepared product is low in water content, good in chemical stability and high in mechanical strength; the finished product rate of a battery is increased, the service life is prolonged and the safety is improved.

The invention discloses a method for treating wood at high temperature and with hot water, comprising following steps: (1) putting wood in high temperature furnace; increasing temperature at furnace to 120-150 Deg. C and keeping temperature; (2) increasing temperature to 180-240 Deg .C when the water content of wood reduced to lower than 5%; keeping temperature and the time is 0.5-3 hours according to wood thickness per cm; (3) reducing temperature at furnace, treating wood with steam or hot water when temperature is reduced below 100 Deg. C to reduce wood water content to 7-10%; (4) reducing temperature continuously and getting wood out of furnace when the temperature inside wood is reduced to about 40 Deg. C; (5) balancing at atmosphere for more than 15 days. The invention can increase size stability, rotproofness and weather ability of wood, and the wood can be applied in environment with large change in humidity and temperature.

A wood-plastics shuttering board for building engineering is composed of at least two basic wood-plastic ply layers made of the filler (vegetative fibers, glass fibers and plastics) and assistant (calcium carbonate, modifier, coupling agent and lubricant), and at least one lattice material layer between two basic wood-plastic ply layers and with two adhesive layers coated on its both surfaces. Its manufacture technology is also disclosed.

The invention relates to a low water absorption polyamide composite and preparation method thereof. 10-90 parts by weight of polyamide and 3-10 parts by weight of phyllo-silicate clay and less than 2 parts by weight of additive are placed into a high speed mixer to be premixed for 20min and then are added into a double screw extrusion machine, and conveying, melting, cutting, extrusion, cooling and granulation are carried out, thus obtaining polyamide/phyllo-silicate master batch, then the polyamide/phyllo-silicate master batch, 10-60 parts by weight of styrene resin, 2-10 parts by weight of compatilizer and 5-20 parts by weight of short glass fiber are placed into the high speed mixer to be premixed for 20min, temperature is controlled to be 40-60 DEG C, and finally extrusion granulationis carried out in the double screw extrusion machine, thus obtaining the low water absorption polyamide composite. Compared with prior art, the invention has the advantages of solvent resistance, high tenacity and easy processability of polyamide and the advantage of low water absorption of ABS resin; besides, phyllo-silicate clay speeds up crystallization of nylon, degree of crystallization and mechanical strength are improved, extremely low water absorption is obtained, and size stability is greatly improved while impact toughness is maintained.

The invention provides a phosphorus-containing flame retardant composition, including: a hypophosphite compound, a DOPO derivative and a polyphosphazene compound. The composition as a flame retardant can play a synergistic effect of several phosphorus-containing compounds, realizes halogen-free flame retardance under small addition amount and reaches level V-0. The invention also provides a contains a polyphenyl ether resin composition containing the above phosphorus-containing flame retardant compositions and a prepreg and a copper clad laminated board prepared from the same. After curing, the polyphenyl ether resin composition achieves flame retardance of V-0 grade under the condition to which the halogen flame retardant does not apply and keeps good dielectric property and heat resistance of polyphenyl ether resin; the prepreg and copper clad laminated board made from the composition have good dielectric property and heat resistance, and realize halogen-free flame retardance to UL 94-V0 grade while ensuring excellent heat resistance and dielectric property; and the composition is applicable to the field of high speed and high frequency printed circuit board, and is in line with the future requirements of green and environmental protection.

The invention belongs to the technical field of high molecular materials, and relates to a high-starch full biodegradable composition and a preparation method thereof. The high-starch full biodegradable composition comprises the following components in parts by weight: 10-80 parts of full biodegradable thermoplastic starch masterbatches, 20-90 parts of biodegradable polyester and 0.3-5 parts of compatilizers. The full biodegradable composition provided by the invention has the advantages of high starch content and good compatibility of starch and a substrate and ensures the mechanical property the material in a long-time storage process; a film product prepared by using the composition can be greatly reduced in cost.

The present invention provides a fluorylbis-benzoxazoly monomer and a preparation method thereof. In a container with a mixer, a cooling pipe and a thermometer, formaldehyde solution of 37 percent and an organic solvent are added according to a weight ratio of (1 to 4) to 1, primary amine is added into the formaldehyde solution at the temperature between 5 DEG C and 10 DEG C, the reaction solution is continuously mixed for reaction for 1 to 4 hours and heated to be between 70 DEG C and 120 DEG C, an organic solvent with dissolved bisphenol fluorine is added, weight percentage of the bisphenol fluorine in the organic solvent is 20 percent to 50 percent, the molar ratio of the bisphenol fluorine and the primary amine is (1 to 2) to 3; the reaction continues to last for 4 to 10 hours at the temperature between 70 DEG C and 120 DEG C, and ultimately the fluorylbis-benzoxazoly monomer can be acquired through post processing. Because of the fluorine structure, the rigidity of molecular chains of the product can be enhanced, and the glass-transition temperature of resin can be improved; because of the enhanced nonpolarity of molecules, the hygroscopicity of the resin is lowered, thereby improving the wet-hot aging performance of the resin is greatly improved.

The invention discloses a synthesis method for waterborne organocilicon-polyurethane block copolymer, comprising steps as follows: reaction is carried out between polyisocyanate and polyol (the polyol comprises the one from the castor oil and carboxyl polyol) to generate isocyanate-terminated polyurethane prepolymer; then chain extension is carried out via amino alkyl polysiloxane; eventually alkaline aqueous solution is adopted for neutralization and dispersion, to prepare aqueous dispersion with excellent dispersion and stability. In addition, the aqueous dispersion is applied as coating for the wood and paper, as finishing agent for leathers and textiles, or as adhesives. Since natural vegetable oil from castor beans is selected and amino alkyl polysiloxane is adopted as the chain extender. The synthesis method for waterborne organocilicon-polyurethane block copolymer has the advantages of remarkably improved hydrophobic property, heat resistance and surface smoothness for the polymer films, simple preparation technique, and easy operation.

The invention relates to an IXPE electronic radiation crosslinked polyethylene conductive foam and a preparation method thereof. The IXPE electronic radiation crosslinked polyethylene conductive foam mainly contains the mother batch: low density polyethylene; accessories: ethylene-vinyl acetate copolymer, azodicarbonamide blowing agent, polyethylene wax lubrication additive, titanate ester coupling agent and conductive carbon black which are mixed for processing, extruded for molding, radiated for crosslinking, heated for foaming, and treated by secondary processing, etc, to produce the IXPE electronic radiation crosslinked polyethylene conductive foam. The crosslinking of the product of the invention can be easily controlled, the foaming process is stable, the foam pores are fine and even, the quality of the surface is high without unpleasant odor, the foam pores are obstructed, the production can be carried out continually, the electrical conductivity is stable, the product is lightweight, non-toxic, extremely less absorbent; the thermal conductivity is slow, aging resistant, chemical corrosion resistant, pulverization resistant, and a plurality of porous foam materials can be easily achieved; in addition, the product has good properties to be treated by the secondary processing procedures, such as bonding, machining, hot forming, etc.

The invention discloses a frame sealing adhesive and a preparation method and application thereof. The frame sealing adhesive comprises the following component: epoxy resin, a curing agent, a rubber powder, an organic filler, a thixotropic agent, a silane coupling agent and a solvent. The frame sealing adhesive has excellent storage performance and an adhesive applying manner suitable for screen printing and is used for sealing a side frame of a TN (twisted nematic) (STN-super twisted nematic) liquid crystal box; in addition, the solidified frame sealing adhesive has the advantages of low hydroscopic property, long-lasting and excellent sealing performance, excellent heat resistance and electric insulation performance, no pollution to liquid crystal, high rigidity, high toughness and high size stability, and important application value.

The invention discloses polyamide resin and intermediate compound thereof as well as the preparation method and the application. The polyamide resin is provided with the chemical structure shown in formula II, wherein, X1 and X2 can be identical or different, representing quadrivalent aryl; Ar represents bivalent aryl, and T represents end capping reagent. The polyamide resin is obtained by polyamic acid shown in formula I structure general formula through chemical imidization or thermal imidization. The polyamide resin is dipped through prosomatic polyamic acid solution or polyamic acid solution being obtained after being dissolved with solvent with a low-boiling point, the basal body is strengthened, and the prepreg is obtained. After the heat-press forming operation is performed, a metal foil layer is covered, and a metal foil layer pressing plate is obtained. The polyamide resin provided by the invention has the advantages of excellent heat resisting property, high mechanical property, low dielectric constant and dissipation, high electrical insulation property and low water absorbing capacity, thereby being especially suitable for manufacturing core plates of packaging subsctrates for packaging super large-scale integrated circuits.

The invention discloses a method for removing lithium ion battery nickel-rich material surface lithium residues by a liquid phase precipitation method. The method for removing the lithium ion battery nickel-rich material surface lithium residues by the liquid phase precipitation method includes the steps: dispersing lithium ion battery nickel-rich materials into phosphate solution, combining the nickel-rich material surface lithium residues with phosphate radical ions so as to form precipitation, nucleating on the material surface, and calcining so that a material with the surface wrapped with a compact Li3PO4 layer is obtained. The wrapping layer prepared by the method is more uniform and compact than a traditional wrapping layer, and storage performance of the material in air is obviously improved; and the moisture absorption performance of the nickel-rich materials can be improved while water brought into electrolyte by electrode materials is reduced, and structural stability of the material is enhanced. Moreover, Li3PO4 is better in stability in the electrolyte than in the battery materials, so that the comprehensive electrochemical performance of a positive electrode material can be effectively improved. The method for removing the lithium ion battery nickel-rich material surface lithium residues by the liquid phase precipitation method is simple in preparation process, short in flow path and low in production cost, and the prepared positive electrode material is excellent in physical performance and electrochemical performance.

The present invention discloses a compressed wood preparation method and compressed wood prepared through the method. The method comprises: (1) carrying out first high-frequency heating on wood with a water content of 12-30 wt%, such that the wood material core temperature achieves 80-120 DEG C; (2) carrying out hot pressing on the wood obtained in the step (1); and (3) carrying out second high-frequency heating on the wood obtained in the step (2), such that the wood material core temperature achieves 180-220 DEG C. The compressed wood prepared by using the preparation method has characteristics of resilience resistance, simple steps, short required time, substantially-increased density, substantially-increased surface hardness, substantially-increased wear resistance, low water absorption recovery rate, and low moisture absorption recovery rate.

The invention discloses an insulating refractory material of polymerized silicon and aluminum and the preparation method, applied in construction and industrial facilities, which is characterized in that: excitation, gas evolution and polymerization are carried out for industrial wastes abundant in aluminum oxide, silicon dioxide, and the complex of the silicon dioxide and aluminum oxide, so as to obtain a three-dimensional aluminum silicate minerals with an internal structure made of a plurality of phases from amorphous to semi-crystalline inside, and an internal form in silica tetrahedron and alumina tetrahedron; a plurality of molecules are linked mainly through ionic or covalent bonds, the mechanical properties of the inorganic concretion are externally presented. The raw materials are composed of silicon and aluminum materials as kaolin, fly ashes, coal gangue, cinder, and red mud; without adding any gelled materials, a high temperature and corrosion resistant porous long-chain structure is formed with an intensity over 0.8MPa and a thermal conductivity coefficient of 0.087 (kilocalorie/ meter x hour x centigrade). The insulating refractory material is applied not only for the heat insulation wallboards in the building but also for the heat insulation and preservation of the industrial thermal pipelines and facilities.