32results about How to "Reduce bond strength" patented technology

The invention relates to a high-temperature ablation resistant ceramic matrix composite material and a preparation method thereof. The method comprises the following steps: preparing a rare earth acetylacetone complex from hexahydrate of rare earth chloride (rare earth nitrate) and acetylacetone; uniformly mixing the rare earth acetylacetone complex with poly (hafnium) oxane by using xylene to obtain a zirconium (hafnium)-rare earth ceramic precursor solution; densifying the porous carbon fiber preform by using a zirconium (hafnium)-rare earth ceramic precursor solution through a precursor impregnation and pyrolysis process to obtain a carbon fiber reinforced carbide ceramic-rare earth zirconium (hafnium) acid salt ceramic-based composite material; and densifying the carbon fiber reinforced carbide ceramic-rare earth zirconium (hafnium) acid salt ceramic-based composite material by using molybdenum chloride and silicon chloride through a chemical vapor infiltration method to prepare the high-temperature ablation resistant ceramic-based composite material. The prepared ceramic-based composite material has excellent high-temperature oxidation ablation resistance and excellent high-temperature mechanical properties at the temperature of 2000 DEG C or above.

The invention relates to the technical field of adhesives, in particular to a dual-curing UV tackifying adhesive and a product thereof. The dual-curing UV tackifying adhesive is prepared from the following components in parts by weight: 73 to 92 parts of acrylate copolymer, 6 to 25 parts of UV polyester resin, 0.4 to 1.7 parts of thermal curing agent and 0.3 to 1 part of photoinitiator. According to the dual-curing UV tackifying adhesive disclosed by the invention, the components are compounded, so that the adhesive can be endowed with relatively low and appropriate bonding strength in a thermocuring stage, the bonding and positioning requirements are met, and the dual-curing UV tackifying adhesive can be stripped from an adhered object and has excellent reworkability; and after positioning, the bonding force between the adhesive and the pasted object is increased through UV illumination, so that the pasting effect of the adhesive on the pasted object is ensured.

The invention relates to a UV viscosity-reducing adhesive, a UV viscosity-reducing adhesive composition, an adhesive tape and a preparation method. The UV viscosity-reducing adhesive comprises an acrylate copolymer, wherein the acrylate copolymer comprises a main chain and a multifunctional acrylate side group grafted on the main chain; the main chain is formed by copolymerizing a plurality of polymeric monomers including an acrylate soft monomer, an acrylate hard monomer and a functional acrylate monomer; the acrylate soft monomer is acrylate long-chain alkyl ester, and the carbon atom number of the long-chain alkyl ester is greater than or equal to 4; the acrylate hard monomer is methyl (methyl) acrylate; the functional acrylate monomer is acrylic acid (ester) containing carboxyl and acrylic ester containing hydroxyl; the polyfunctional group acrylate side group is formed by a UV active substance, each molecule of which contains a plurality of acrylate groups and contains one epoxy group, through a reaction between the epoxy group and the carboxyl group on the main chain. The UV viscosity-reducing adhesive has a UV viscosity-reducing function, does not need to additionally add UV active monomers or low polymers, can enhance the UV light viscosity-reducing effect and improve the viscosity-reducing efficiency, and is also beneficial to reducing the ingredient composition of a UV adhesive material and simplifying the preparation method.

The invention discloses a thermal viscosity-reducing adhesive, a thermal viscosity-reducing adhesive tape and a preparation method of the thermal viscosity-reducing adhesive tape. The soft monomer is composed of one or more of isononyl acrylate, heptyl acrylate, polycaprolactone acrylate, polyethylene oxide-based acrylate, siloxane modified acrylate, vinyl octanoate and isododecyl acrylate; the hard monomer is prepared from one or more of dicyclopentadiene acrylic ester, poly (p-phenylene terephthamide), hexafluoropropylene oxide and polyaryletherketone; the functional monomer is composed of one or more of epoxy propyl acrylate, sulfo acrylate, mercapto acrylate and methoxyl acrylate. According to the scheme, by optimizing the ratio of the soft monomer to the hard monomer, the stripping force of the adhesive can be accurately controlled under the high-temperature process condition, so that the stable bonding force is kept, excessive stripping or bonding strength reduction is avoided, and the stripping requirement after the high-temperature process is met.

The present application relates to the low temperature curing high-strength benzoxazine type silicone adhesive formula and use method, the formula includes the benzoxazine group containing organic silicon compound and organic alkali compound, the mass ratio of benzoxazine group containing organic silicon compound, organic alkali compound is 100:0.1-20.The adhesive of the present application is based on the cooperation between the benzoxazine group containing organic silicon compound and the basic catalyst, can be cured at low temperature, realize the higher strength bonding.The benzoxazine type silicone adhesive formula provided by the present application can be directly used as adhesive, and the bonding strength is high;It can also be used as a basic formula, used as an adhesive after adding other fillers, to meet the different needs of various special occasions.

The invention relates to the technical field of vehicle power batteries, in particular to a battery pack assembly easy to disassemble and a vehicle. The battery pack assembly comprises two blocking pieces, a battery module arranged between the two blocking pieces and a restraining piece connected to the upper surface of the battery module; the battery module comprises two end plates and a plurality of battery cell units which are arranged between the two end plates in parallel, and elastic pieces are arranged between the battery cell units and the end plates or between the adjacent battery cell units; the restraining piece is used for limiting the position of the battery cell unit in the vertical direction, and the two end parts of the restraining piece are detachably connected with the two blocking pieces respectively; gluing through holes are formed in the positions, corresponding to the tops of the battery cell units, of the restraining pieces, and the surface tension of the sides, making contact with the battery cell units, of the restraining pieces is lower than the surface tension of the sides, away from the battery cell units, of the restraining pieces. The battery pack assembly is simple in structure and convenient to disassemble, and the maintenance cost of the battery pack assembly can be reduced.

The invention discloses a chromium-containing crucible and a preparation method thereof, and the chromium-containing crucible comprises the following raw material components in percentage by mass: 23-26% of white corundum; 29 to 31% of mullite; 13-15% of aluminum oxide; 1-3% of silica powder; 19 to 21% of tabular corundum; 5-7% of chromium oxide; 0.5 to 1.5 percent of an additive; the chromium-containing crucible prepared by the invention is longer in service life, and the service life of the chromium-containing crucible can be prolonged to 45 or more than 45 from the original 30; chromium oxide is introduced and the raw material ratio is optimized, so that the density of the crucible is remarkably improved, molten metal bonding is effectively prevented, and slag bonding is less during smelting; the bonding strength between the slag and the crucible wall is lower, and the slag is easier to clean.

The utility model provides a sheet porous waste removing device, which relates to the technical field of waste removing devices, and comprises a waste removing shell with openings at the upper end and the lower end, a stripping knife is arranged in the waste removing shell, and the cutting edge of the stripping knife is arranged downwards. A waste removing mechanism used for beating sheet porous waste down from a sheet bottom film is arranged below the stripping knife, a first winding roller and a second winding roller are arranged on the two sides of the stripping knife correspondingly and rotationally installed on a waste removing shell, and the sheet bottom film sequentially winds around the first winding roller, the stripping knife and the second winding roller and is wound around the first winding roller, the stripping knife and the second winding roller. According to the utility model, the stripping knife is matched with the waste removing blade which rotates at a high speed, so that the porous waste of the sheet is efficiently removed, and the waste of a base film of the sheet is reduced.

The invention discloses a PCCP pipe bell and spigot joint sealing system manufacturing method and a PCCP pipe bell and spigot joint sealing system manufactured through the PCCP pipe bell and spigot joint sealing system. During manufacturing, a joint is filled with an elastic blocking piece, the elastic blocking piece is divided into a first sub-joint and a second sub-joint, and the elastic blocking piece is arranged in the joint in an abutting mode through a locking mechanism; mortar is poured into the first sub-joint through a reserved first grouting opening, and the locking mechanism is removed after the mortar does not flow; a base layer is arranged on the upper end face of an upper opening of the second sub-joint, anticorrosive paint is applied to the base layer to form an anticorrosive coating, the anticorrosive coating and the base layer form a plugging structure and seal the second sub-joint, and sealant is poured into the second sub-joint through a reserved second grouting opening; the elastic barrier piece is basically non-sticky to mortar and the like; the method is suitable for construction in the low-temperature environment, the obtained sealing system can adapt to different stress interferences and different environmental factors, lasting sealing can be achieved, the construction technology can be simplified after the anti-corrosion coating is formed in a front-arranged mode, and the construction speed is high.

The present invention belongs to the technical field of composite additive manufacturing of metal structural parts, and specifically relates to an interlayer ultrasonic impact-assisted high-performance CMT arc additive manufacturing method and device. The present invention realizes the regulation of stress and structure in the forming process of arc additive components through the alternating operation of a cold metal transition arc additive manufacturing control device and a harmonic ultrasonic impact control device, and the strengthening effect is more thorough. The present invention effectively eliminates the residual tensile stress on the interface and produces uniform plastic deformation by performing harmonic ultrasonic impact treatment on the interlayer bonding interface in the CMT arc additive manufacturing process, thereby regulating the size of the primary coarse columnar β crystals and improving the anisotropy of the mechanical properties of the components, so as to achieve the effect of reducing the grain size, eliminating metallurgical defects, and improving strength and plasticity in an integrated manner.

The invention discloses a high-bonding-strength dual-waveband ultraviolet curing hot-melt pressure-sensitive adhesive tape capable of being reworked. The high-bonding-strength dual-waveband ultraviolet curing hot-melt pressure-sensitive adhesive tape sequentially comprises a conductive base material layer, a dual-waveband UV curing pressure-sensitive adhesive layer and a release layer from bottom to top, the dual-waveband UV curing pressure-sensitive adhesive layer is prepared from the following raw materials in parts by weight: 50 to 100 parts of ultraviolet curing acrylate hot-melt pressure-sensitive adhesive, 30 to 80 parts of cationic light curing resin, 0.2 to 5 parts of coupling agent, 0.5 to 5 parts of ultraviolet curing cationic initiator, 5 to 15 parts of tackifying resin and 2 to 15 parts of electric repair additive; after the adhesive tape is formed, an adhesive layer has certain cohesive force and pressure sensitivity, and room-temperature operation is convenient and fast; before the pressure-sensitive adhesive tape is applied and used, the adhesive surface is activated and cured by 254mm wave band UV cations, and the cation light-cured epoxy resin in the adhesive layer is subjected to cross-linking reaction, so that the bonding strength of the pressure-sensitive adhesive tape is further improved; when repair is needed, direct current is connected, the bonding strength can be remarkably reduced, and easy repair is achieved.

The application discloses a high-temperature high-power hybrid integrated device and a packaging method thereof, and belongs to the technical field of integrated circuits. The device comprises a circuit module (1) and a heat storage unit box body (2) provided with an inner cavity. A recess (21) is arranged on the surface of the heat storage unit box body (2), the circuit module (1) is fixedly connected in the recess (21), the circuit module (1) is in contact with the heat storage unit box body (2) to form heat conduction, a first filling body (3) composed of phase change heat storage materials is arranged in the heat storage unit box body (2), and a heat insulation layer (6) is arranged on the outer surface of the heat storage unit box body (2). The application effectively improves the heat dissipation capacity and high-temperature resistance of the circuit module, simultaneously reduces the temperature of internal components of the circuit, enables the circuit to normally work in the case that components and materials with a rated working temperature lower than an ambient temperature are adopted, and avoids the adoption of valuable high-temperature components and materials, so that the economic cost of the circuit module is reduced as a whole.

The invention discloses a method for preparing a ceramic part by adopting fused deposition, which comprises the following steps: weighing ceramic powder, a low-molecular-weight polymer, stearic acid, an ethylene-vinyl acetate copolymer, polyethylene, polyvinyl butyral and a plasticizer, mixing to obtain a blocky feed, crushing and sieving to obtain a granular printing feed, and sintering to obtain the ceramic part. And the feed is added into a stock bin of an FDM3D printer, a printing blank is prepared through fused deposition, the printing blank is subjected to isostatic pressing forming, an air pressure melting process, degreasing, glue discharging and sintering, a ceramic blank is obtained, precision machining and polishing are conducted, and the ceramic part is obtained. According to the method disclosed by the invention, a ceramic fused deposition technology, an isostatic pressing molding technology and an air pressure melting technology are subjected to synergistic interaction, so that the density and interlayer bonding strength of the green body are obviously improved, and the ceramic part has high mechanical property and reliability.

The invention relates to a pole piece stripping device which is used for stripping an active material on the surface of a current collector, the pole piece stripping device comprises a rack, a conveying mechanism, a recovery tank and a spraying mechanism, the conveying mechanism is arranged on the rack, the conveying mechanism comprises a first mounting assembly, a second mounting assembly, a first grid belt and a second grid belt, the first grid belt is wound on the outer side of the first mounting assembly, the second grid belt is wound on the outer side of the second mounting assembly, at least parts of the first grid belt and the second grid belt are oppositely arranged, and the first grid belt and the second grid belt are matched and used for clamping a pole piece; a first fluid is arranged in the recovery tank, the first grid belt and the second grid belt are at least partially immersed in the first fluid, and the first fluid is used for heating the pole piece; the spraying mechanism is arranged on the rack and used for spraying second fluid towards the pole piece.

The present application relates to the technical field of building ceramics, and particularly relates to a bright ceramic tile with antiskid and antifouling properties and a preparation method thereof, comprising the following steps: A. applying a base glaze to the surface of a body layer to form a base glaze layer; B. spraying engraved dry particles to the surface of the base glaze layer to obtain an engraved dry particle layer; C. applying a protective glaze to the surface of the engraved dry particle layer to obtain a protective glaze layer; D. drying and then entering a kiln for calcination, and polishing to obtain the bright ceramic tile with antiskid and antifouling properties; wherein the bright ceramic tile with antiskid and antifouling properties has holes, and the holes are formed by the inner core particles and the bridging layer of the engraved dry particles falling off. The bright ceramic tile with antiskid and antifouling properties and the preparation method thereof are beneficial to ensuring the bright effect and also having good antiskid and antifouling properties, so as to overcome the shortcomings in the prior art.

The invention relates to 4A zeolite, a preparation method thereof and PVC, and belongs to the technical field of zeolite preparation. The method comprises the following steps: at a first temperature, carrying out a gel forming reaction on an aluminum source with a second temperature and a silicon source with a third temperature to reduce the bonding strength of a product of the gel forming reaction so as to obtain sodium aluminosilicate gel slurry; and crystallizing the sodium aluminosilicate gel slurry to obtain the 4A zeolite. At a first temperature, an aluminum source with a second temperature and a silicon source with a third temperature are subjected to a gel forming reaction, an aluminum-oxygen tetrahedron AlO4 and a silicon-oxygen tetrahedron SiO4 of the aluminum source are combined to form a sodium aluminosilicate skeleton structure, and the first temperature, the second temperature and the third temperature synergistically improve the activity of ions in the skeleton. Therefore, the bonding strength between ions of a product of the gel forming reaction is reduced, and the binding force of a skeleton to water molecules is reduced. The 4A zeolite product prepared by the invention realizes moisture lt; 7%.

The present invention relates to a rotary air preheater with a steam soot blowing device, comprising a rotor, wherein the rotor is provided with flue gas, primary air and secondary air compartments, a heat exchange element and a steam soot blowing device, wherein the steam soot blowing device is arranged in the cold secondary air inlet air duct of the secondary air compartment, and the steam soot blowing device comprises a steam soot blower, a gun barrel and a nozzle assembly, wherein the nozzle assembly comprises a first nozzle assembly and a second nozzle assembly, wherein in the rotation direction of the rotor, the first nozzle assembly is located upstream of the second nozzle assembly, and the first nozzle assembly comprises a throttling tube and a nozzle; the second nozzle assembly comprises a distribution pipe and a nozzle, and the nozzle jet velocity is less than the nozzle jet velocity. The present invention improves the steam purging conditions, eliminates the influence of the backflow obstruction on the steam jet, improves the purging effect of the ammonium bisulfate deposited ash, reduces the hardness and bonding strength of the deposited ash, improves the shearing and flushing effect of the downstream high-speed and low-temperature steam jet on the deposited ash, and improves the removal effect of the ammonium bisulfate deposited ash.

The invention provides a preparation method of a laser-strengthened wear-resistant hard film, which relates to the field of surface treatment and comprises the following steps: step 1, pretreatment of a substrate: carrying out a pretreatment process of oil and rust removal treatment and polishing treatment on the substrate; 2, preparing a ceramic hard thin film: preparing the ceramic hard thin film on the surface of the pretreated substrate by utilizing chemical vapor deposition; and thirdly, laser scanning strengthening is conducted, specifically, laser melting equipment is adopted for conducting laser scanning strengthening on the surface of the ceramic hard thin film, and therefore a laser strengthening layer is formed between the base body and the ceramic hard thin film. According to the method, the problem of low bearing capacity of the metal base material is solved through combination of laser strengthening and the ceramic hard thin film, so that the excellent characteristics of high hardness, high wear resistance, high temperature resistance, corrosion resistance and the like of the ceramic hard thin film are fully exerted.

The present application relates to a kind of acrylic polymer emulsion, its raw material composition and its preparation method and application, belong to building coating technical field.It includes the following weight parts of raw materials: pre-emulsion I 15-25 parts, pre-emulsion II 45-55 parts, emulsifier solution 10-20 parts, initiator solution 1-10 parts, post-processing solution I 1-5 parts, post-processing solution II 1-5 parts, adipohydrazide 0.5-2 parts, triethanolamine 1-5 parts.The acrylic polymer emulsion prepared in the present application has strong cohesion, elongation and elasticity, the soft porcelain prepared using the emulsion is not easy to break or remain when demolding after curing, thereby effectively solving the adhesion problem of soft porcelain on silica gel mold, and the acrylic polymer emulsion prepared in the present application itself has low odor, significantly reduces the peculiar smell of soft porcelain finished product, improves environmental protection and use experience.

The invention belongs to the technical field of extrusion coatings, and particularly relates to a tubular low-density polyethylene composition for an extrusion coating and a preparation method of the tubular low-density polyethylene composition. The low-density polyethylene composition is prepared from the following raw materials in parts by weight: 90 to 95 parts of low-density polyethylene, 5 to 10 parts of ethylene-vinyl acetate copolymer, 0.05 to 0.10 part of grafting agent, 0.005 to 0.010 part of initiator and 0.05 to 0.10 part of antioxidant, and the sum of the parts by weight of the low-density polyethylene and the ethylene-vinyl acetate copolymer is 100. The low-density polyethylene composition disclosed by the invention has good tensile and adhesive properties, can be processed at a high speed, is relatively small in shrinkage, and overcomes the defects of poor adhesion and large shrinkage of LDPE (Low-Density Polyethylene) of an original tubular method.

The invention belongs to the technical field of solid-state batteries, and relates to a double-layer solid-state electrolyte membrane, a preparation method thereof and application of the double-layer solid-state electrolyte membrane in a solid-state battery. The double-layer solid electrolyte membrane comprises a positive electrode membrane and a negative electrode membrane which are arranged in sequence; the positive electrode film is prepared from a positive electrode film solution, and the positive electrode film solution comprises 1-3 parts by weight of nano zinc oxide quantum dots; the negative electrode film is prepared from a negative electrode film solution, and the negative electrode film solution comprises 1-4 parts by weight of nano zinc oxide quantum dots. The nano zinc oxide quantum dots are added into the positive electrode film and the negative electrode film, so that the mechanical strength and the ionic conductivity of the positive electrode film can be effectively improved; meanwhile, the nano-zinc oxide quantum dots have relatively strong adsorbability on the DMF solvent, and a large amount of residual DMF solvent is adsorbed in the nano-zinc oxide quantum dots, so that the large amount of residual DMF solvent is prevented from directly generating side reaction with the positive electrode material, and the ionic conductivity of the solid electrolyte and the charge-discharge performance of the battery are improved.

According to the oxygen vacancy-containing manganese dioxide and the preparation method thereof, the manganese dioxide is subjected to a reduction reaction under the reduction condition to obtain the oxygen vacancy-containing manganese dioxide, the oxygen vacancy-containing manganese dioxide is used as a raw material to prepare an aqueous zinc-manganese battery, and the cycling stability, the conductivity and the specific capacity of the aqueous zinc-manganese battery are improved.

The present invention provides an assembly connection structure between a middle frame and a base and an air conditioner having the same, wherein the assembly connection structure between the middle frame and the base includes a plurality of clamping structures arranged between the middle frame and the base, wherein the clamping structures are used for fixed connection between the middle frame and the base, and a positioning structure is also arranged between the middle frame and the base, wherein the positioning structure is used for assembly and positioning of the middle frame and the base. The present invention realizes rapid assembly and positioning by means of the coordinated installation of the positioning pin and the clamping structure, realizes linear coordinated installation and disassembly of the entire clamping process by setting the coordinated angle of the clamping structure, improves the anti-slip performance of the clamping structure by setting the straight line segment on the buckle, and facilitates the installation and / or disassembly of the clamping structure by setting different demoulding angles on the buckle seat. The present invention has a simple structure and is easy to produce, and improves the assembly speed and assembly strength of the middle frame and the base of the integrated panel.

The invention relates to the technical field of metal surface treatment, in particular to a furnace roller self-abrasion coating for a horizontal continuous annealing furnace and a preparation method of the furnace roller self-abrasion coating. The surface of a furnace roller of the horizontal continuous annealing furnace is subjected to surface strengthening in a working layer mode of a high-temperature alloy MCrAlY bottoming and a ceramic coating (powder formed by mixing three kinds of ceramics); the high-temperature alloy plays a role in transition between the matrix and the ceramic coating, the bonding performance of the coating is improved, and the coating of the working layer is mainly oxide ceramic of ZrO2-Y2O3 + BN + SiO2. Wherein the ZrO2-Y2O3 plays a role in supporting a framework; the BN plays a role in lubrication and adhesion prevention; siO2 is mainly used for reducing the internal bonding strength of the coating, so that the coating can be timely stripped to prevent the accumulated lumps from continuing to adhere and grow when small accumulated lumps appear on the surface of the roller piece.

The present invention discloses a high temperature resistant hot melt adhesive film and a preparation method thereof, and relates to the technical field of fuel cell production. The high temperature resistant hot melt adhesive film comprises a release layer, a hot melt layer I, a toughening layer and a hot melt layer II arranged in sequence, wherein the toughening layer is respectively embedded in the hot melt layer I and the hot melt layer II; the release layer is one of a double-sided matte OPP film, a CPP film or a PP synthetic paper; the toughening layer is a thermoplastic nanofiber film prepared by an electrostatic spinning process. The high temperature resistant hot melt adhesive film of the present invention not only has high bonding strength, good sealing, low compression deformation and excellent stress buffering, but also uses a nanofiber membrane as a toughening layer to not only improve the stiffness of the hot melt adhesive film, but also facilitates product die cutting processing, and the nanofiber membrane impregnated in the hot melt layer can improve the peeling strength of the hot melt adhesive film at high temperature, avoiding the reduction of the bonding strength of the hot melt adhesive film at high temperature.

The application discloses an ultrasonic-assisted abrasive jet rust removal device and a rust removal method, and relates to the technical field of rust removal. The ultrasonic-assisted abrasive jet rust removal device comprises an abrasive jet system and a longitudinal ultrasonic vibration workbench. In the abrasive jet system, a booster pump and a speed regulating valve are connected with a high-speed water inlet of a nozzle through a hydraulic pipeline, an abrasive bin and an abrasive valve are connected with an abrasive inlet of the nozzle through an abrasive pipeline, the nozzle is installed at the end of a mechanical arm, and the longitudinal ultrasonic vibration workbench is vertically installed below the nozzle. When in use, an ultrasonic generator is started, a workpiece is vibrated through a clamp, the pose of the nozzle is controlled by using the mechanical arm, pump pressure, water flow rate and abrasive flow rate are adjusted, and the abrasive jet is used to impact and strip rust. The application improves the stripping and removal efficiency of rust through the synergistic effect of the longitudinal ultrasonic workbench and the abrasive jet, reduces the pressure demand on the jet equipment, and reduces the wear of the nozzle.

The invention discloses a modified coal. By adding solid particles or powders such as kaolin, bauxite, limestone, quartz ore, titanium dioxide, etc. to the coal, the ash composition and ash content of the modified coal are controlled, and the silicon and aluminum compounds in the ash are converted into silicon dioxide and aluminum trioxide. The mass ratio of silicon dioxide to aluminum trioxide is (1.0-4.0):1, and the sum of the mass of silicon dioxide and aluminum trioxide accounts for more than 40% of the total mass of the ash. The slagging and contamination characteristics of the coal can be improved, the serious slagging and contamination problems of the boiler can be alleviated and avoided, and the adaptability of the boiler to the fuel can be improved. The modified coal of the invention has simple components, the raw materials used are cheap and easy to obtain, and has good market prospects.

The invention provides impregnating resin with low viscosity and long pot life and a preparation method thereof. Belongs to the field of impregnating resin. According to the technical key points, the adhesive comprises the following components in percentage by mass: 90-100 parts of vinyl acetate; 90 to 100 parts of a modified monomer; 1 to 1.5 parts of polyvinyl alcohol; 1.2 to 1.5 parts of dodecylphenol polyoxyethylene ether; 1.5 to 1.8 parts of sodium chloride; 0.3 to 0.4 part of ammonium persulfate; 1.3 to 1.4 parts of sodium bicarbonate; 90 to 100 parts of distilled water; 3 to 4.3 parts of styrene; silicone oil; 2 to 6 parts; and 1.1 to 1.3 parts of sodium hydroxide. The method comprises the following steps: S1, adding a mixed solution of a sodium hydroxide solution and a sodium chloride solution into a modified monomer, washing for 3-5 times, filtering and separating the monomer, and washing for 3-5 times by using distilled water; the invention aims to provide impregnating resin with low viscosity and long pot life and a preparation method thereof. The impregnating resin is used for enabling the impregnating efficiency to be higher when the whole impregnating resin is used, and meanwhile, the impregnating requirement of a high-density base material can be met.

The invention relates to the field of preparation of friction materials for cue heads in billiard sports, in particular to a modified water glass adhesive, friction-resistant chalk and a preparation method of the friction-resistant chalk. The polyvinyl alcohol and the derivative thereof are introduced into the sodium water glass, so that the moisture absorption resistance of the sodium water glass is enhanced, the internal friction effect in the extrusion process is effectively reduced, the flowability of powder is improved, the powder is prevented from being blocked, and extrusion molding of the chalk is facilitated; by introducing the lithium salt, the bonding strength is reduced, and the powder falling problem of the chalk powder is improved; by adding the sodium water glass, the lithium salt, the polyvinyl alcohol and the derivative thereof, the silica sol has good film forming continuity and stability.

The utility model discloses a multifunctional composite breathing film, a heat insulation assembly, a battery module and a battery pack, the multifunctional composite breathing film comprises a phase change layer and a heat insulation packaging film wrapping the phase change layer, and a temperature sensing viscous coating is arranged on the outer surface of the heat insulation packaging film; the phase change layer is in a liquid state within the working temperature range of the battery cell, and the viscosity of the temperature-sensitive viscous coating is gradually weakened along with the rise of the temperature. According to the multifunctional composite breathing film provided by the utility model, the outer temperature sensing viscous coating is bonded with the battery cell, the inner phase change layer can completely meet the ballooning caused by a large surface when the battery cell is charged and discharged, and the breathing film can be automatically adjusted according to the ballooning degrees of different areas on the large surface of the battery cell; therefore, the large surface of the whole battery cell is under the same pre-tightening pressure, the attenuation of the battery cell is improved, and the cycle life of a battery pack is greatly prolonged. Meanwhile, the heat insulation packaging film has excellent heat insulation blocking performance, and heat spreading of the thermal runaway battery cell can be effectively isolated.