94results 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 provides a ceramic rigid-flex circuit substrate and a preparation method thereof, and the method comprises the specific steps: S1, cleaning a ceramic substrate, and arranging a brazing metal transition layer on the surface of the ceramic substrate; s2, low-melting-point brazing filler metal is sprayed to the surface of the brazing metal transition layer of the ceramic substrate, and a multi-layer flexible circuit board is attached to the surface, sprayed with the low-melting-point brazing filler metal, of the aluminum nitride ceramic substrate to obtain an attached plate; and S3, placing the laminated board in a vacuum or protective atmosphere for welding to obtain the ceramic rigid-flex circuit substrate. The ceramic substrate is adopted, the brazing metal transition layer is introduced to the surface of the ceramic substrate, the welding process of the flexible circuit board and the ceramic substrate is optimized, the problems that heat conduction is difficult, interface thermal resistance is large and uneven or bonding strength is insufficient are effectively solved, and the overall performance and quality of a product are improved.

The invention relates to a photo-degradable room temperature curing double-component polyurethane adhesive and a preparation method thereof.The adhesive comprises a component A and a component B. The component A comprises a polyol modified polyurethane prepolymer with the end group being an isocyanate group, and the component B comprises a polyhydroxy composition; the component A and / or the component B further comprises a photodegradable oximido unit. After the two components in the adhesive are mixed, sized and cured, the oximido unit can be degraded through ultraviolet irradiation, so that the bonding strength is reduced, and a bonding base material can be naturally debonded along with the prolonging of the irradiation time. In the gluing process, curing can be completed at the room temperature after the two components are mixed, bonding of a heat-sensitive material can be achieved easily, then a bonding sample can be detached through ultraviolet irradiation, and good application prospects are achieved.

The utility model discloses an anti-blocking chemical fiber spinneret plate which comprises an installation sleeve, a spinneret plate body is installed in the installation sleeve, a protective cover is further installed at the upper end of the installation sleeve, a feeding pipe is installed on the right side of the installation sleeve, an air blowing opening is formed in the left side of the installation sleeve, and a baffle is rotatably installed at the position of the air blowing opening through a rotating shaft. A hot air pipe is mounted on the left side of the mounting sleeve corresponding to the air blowing port; the mashing mechanism is mounted on the protective cover and used for mashing spinneret orifices in the spinneret plate; the scraping mechanism is installed in the installation sleeve and used for scraping raw materials at the lower end of the spinneret plate, the structure is reasonable, the residual raw materials in the spinneret plate can be better cleaned, the blocking phenomenon can be effectively prevented in the follow-up use process, and therefore the use requirement is better met.

The invention provides an ordered platinum alloy catalyst, a preparation method and a fuel cell, and belongs to the field of fuel cells. Comprising an inner core, the inner core is a compound of PtMM * alloy and C, M is non-noble metal, and M * is low-melting-point metal; the shell covers at least part of the surface of the inner core, and the shell is a carbon layer. The low-melting-point metal element is added into the ordered platinum alloy catalyst firstly, so that the ordering transformation temperature can be reduced, finally, the ordered alloy can be obtained through heat treatment at the low temperature, and agglomeration and growth of alloy particles are avoided to the maximum extent. And secondly, carbon coating is formed on the outer layers of the PtMM * alloy particles, so that sintering, agglomeration and growth of the metal particles are effectively avoided in the heat treatment process. And finally, the carbon-supported platinum alloy catalyst is prepared by coupling the carbon-supported platinum alloy catalyst and the carbon-supported platinum alloy catalyst, and agglomeration and growth of Pt alloy can be avoided in the process of forming an ordered structure by the Pt alloy catalyst, so that a relatively small and uniform particle size is ensured.

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 provides a high-strength carbon ceramic brake disc. The high-strength carbon ceramic brake disc comprises 40-60 vol% of carbon, 30-55 vol% of silicon carbide and 3-13 vol% of silicon. The carbon comprises a resin carbon fiber phase and a deposited carbon fiber phase, and the resin carbon fiber phase comprises resin carbon and skeleton carbon fiber coated by the resin carbon; the deposited carbon fiber phase comprises deposited carbon and filled carbon fibers coated with the deposited carbon; the content of the resin carbon fiber phase is 35-55%, and the content of the deposited carbon fiber phase is 3-15%. According to the high-strength carbon ceramic brake disc, the resin carbon fiber phase is used as a main material, the resin is used for impregnating fibers, curing is performed, then chopping is performed, and during chopping and impregnating of the resin carbon fiber phase, due to protection of the resin, fiber damage is small, and the strength of the brake disc is effectively improved; part of filling fibers which are subjected to chemical vapor deposition but have a smaller k value of fiber bundles are also added into a matrix, and a deposited carbon fiber phase can play a role in deflecting cracks in a product due to the existence of an interface of deposited carbon / carbon fibers, so that the toughness of the material is ensured.

The invention relates to the technical field of hot melt adhesives, in particular to a polyurethane toughened phenolic resin hot melt adhesive film and a preparation method thereof.The hot melt adhesive film comprises phenolic resin, polyurethane and high-temperature-resistant filler; the polyurethane is prepared from the following raw materials in parts by weight: 100 parts of polyhydric alcohol, 10 to 35 parts of chain extender and 40 to 100 parts of isocyanate through reaction, and the polyurethane is prepared from the following raw materials in parts by weight: 100 parts of polyhydric alcohol, 10 to 35 parts of chain extender and 40 to 100 parts of isocyanate. The weight part ratio of the chain extender to the isocyanate is 1: (4.0-6.0); the ratio of the total parts by weight of the chain extender and the isocyanate to the parts by weight of the polyol is 1: (0.8-2.0). The polyurethane toughened phenolic resin hot melt adhesive film has the advantages of no solvent use, environment friendliness, low viscosity and the like, has a more excellent impregnation effect on fibers, and is beneficial to improving the mechanical properties of a composite material.

The invention relates to the technical field of epoxy coiled materials, in particular to an environment-friendly strippable seam filling agent as well as a preparation method and a use method thereof. The steric effect caused by-X groups in the polyaspartic acid polyurea resin is utilized, so that the reaction rate of the component A and the component B is controllable, and the adhesive force is moderate. On the basis, polyol alpha and polyol beta are introduced and compounded to improve a chain segment structure after the component A and the component B are reacted and cured, so that the cured chain segment structure has certain toughness. The prepared environment-friendly strippable seam filling agent has relatively low static viscosity and relatively high dynamic viscosity, can be used for filling a seam of an epoxy coiled material of 0.5-1mm, can be easily peeled off from a surface layer of the epoxy coiled material after the seam filling is finished, and can be effectively adhered to the side surface of the epoxy coiled material.

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 separator for a secondary battery according to the present disclosure includes a porous polymer substrate; and a porous coating layer disposed on at least one surface of the porous polymer substrate wherein the porous coating layer comprises inorganic particles, a binder polymer and a dispersant wherein the binder polymer comprises at least three types of fluorine-based polymers, and wherein the dispersing agent comprises a first dispersing agent and a second dispersing agent having a lower weight average molecular weight than the first dispersing agent.

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 the technical field of evaporator defrosting, in particular to an evaporator air defrosting system for a quick-freezing device, which comprises a quick-freezing device body, an evaporator on the quick-freezing device body, a reciprocating cleaning and scraping part mounted on the quick-freezing device body, and a melting promoting mechanism arranged on the reciprocating cleaning and scraping part, the reciprocating cleaning and scraping part is arranged on the evaporator, and the two-way air attack parts are arranged on the reciprocating cleaning and scraping part and locally located on the two sides of the reciprocating cleaning and scraping part, so that normal operation of the evaporator and the quick freezing device body is not hindered while the evaporator is effectively, uniformly and thoroughly defrosted in time to be prevented from being subjected to various negative effects, and long-time refrigeration interruption is not needed; and the defrosting layer is not melted at high temperature, so that large-amplitude cold and heat exchange cannot occur in the defrosting process, the internal temperature of the quick freezing device body cannot be influenced, and the influence on the quality of a frozen product is effectively prevented.

The invention discloses an electrochemically oxidized starch composite nano silicon dioxide-based adhesive as well as a preparation method and application thereof, and belongs to the technical field of water-based adhesives. The preparation method comprises the following steps: (1) preparing starch slurry from starch, adding sodium ion salt and dilute acetic acid, then carrying out electrochemical oxidation, after the electrochemical oxidation is finished, heating, and dropwise adding water glass and sodium hydroxide for gelatinization, so as to obtain an electrochemically oxidized starch composite nano silicon dioxide-based adhesive matrix; and (2) adding a defoaming agent, a cross-linking agent, an emulsifying agent and pigments and fillers into the adhesive matrix obtained in the step (1) to obtain the electrochemical oxidation starch composite nano silicon dioxide-based adhesive. The process conditions are mild, the raw materials are cheap, easy to obtain, non-toxic and harmless, the bonding strength and the water resistance of the prepared adhesive are effectively improved, the viscosity is effectively reduced, the process convenience of the adhesive during storage and sizing is enhanced, and the adhesive has important application value.

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.