85 results about "Shrinkage rate" patented technology

A base film for use in laminating with a sealing film to form a packaging film, the base film being composed of a stretched film made of a polyethylene resin having a density of 0.95 g / cm 3 The above at least one base layer having high-density polyethylene as a main component, the base film having a heat shrinkage rate in a stretching direction of less than 5% at 120°C and a tensile elastic modulus of 2000 MPa or more.

This invention discloses a floor repair agent and its preparation method, belonging to the field of building materials technology. The repair agent comprises a modified resin component, a curing agent component, a modified composite functional filler, and composite additives. The modified resin is a composite system of silane coupling agent-modified epoxy resin and terminally hydroxylated polyurethane. The modified composite filler consists of modified nano-silica, passivated quartz sand, and hydroxylated recycled polyurethane rigid foam powder. The composite additives include a compound toughening agent and composite modified polypropylene fibers. During preparation, each component undergoes targeted modification pretreatment, followed by temperature-controlled stirring and step-by-step mixing to obtain the finished product. This invention solves the problems of poor resin compatibility, weak filler bonding force, and easy cracking and debonding in existing repair agents. The product has high bonding strength, low shrinkage, wear resistance, and impact resistance. It can be used stably in environments ranging from -30℃ to 80℃, is environmentally friendly and odorless, and is easy to apply. It combines performance and cost advantages, and is suitable for long-term repair of various floor types and heavy-duty, high- and low-temperature conditions.

This invention discloses a 3D printing material with adjustable PBT crystallinity and its preparation method, relating to the field of polymer materials technology. This 3D printing material with adjustable PBT crystallinity utilizes a terpolymer containing epoxy functional groups as a crystallinity regulator, blended with PBT resin in a specific ratio, to achieve precise control over the crystallization behavior of PBT. During melt blending, the epoxy groups on the crystallinity regulator molecular chain can chemically react with the terminal carboxyl or hydroxyl groups of the PBT resin, forming appropriate grafting or crosslinking points. Simultaneously, by controlling the amount of crystallinity regulator added, the crystallinity of the final composite material can be continuously and precisely adjusted within the range of 25% to 40%, thereby fundamentally balancing the warping force caused by crystallization shrinkage with the material's ability to maintain its shape, solving the problems of large crystallization shrinkage, narrow processing window, and poor performance stability in existing technologies.

The present invention provides a decorative laminate member capable of imparting high designability and excellent adhesion and suppressing generation of warping, and a decorative molded body comprising the same. A decorative laminate member having a transparent coating film layer (A), a resin substrate layer (B), a design layer (C), an adhesive layer (D), and a heat-resistant film layer (E), characterized in that the heat shrinkage rate of the decorative laminate member when heated from 35°C to 105°C and then cooled from 105°C to 35°C is 0% or more and 3.0% or less.

This application relates to absorbent articles for pets and a method for manufacturing absorbent articles for pets, improving the fit of absorbent articles for pets. The absorbent article for pets has a main body having an elongated shape including a long side and a short side, and includes a surface sheet disposed on the skin side, a back sheet disposed on the non-skin side, and an absorbent body disposed between the surface sheet and the back sheet. The main body includes a low-elasticity region disposed at a position overlapping the absorbent body when viewed from the thickness direction of the main body, and a high-elasticity region disposed at a position not overlapping the absorbent body when viewed from the thickness direction of the main body. The low-elasticity region and the high-elasticity region are offset from each other in the long side direction. Each of the low-elasticity region and the high-elasticity region includes an elastic member providing elastic force in the long side direction. The shrinkage rate of the high-elasticity region in its natural state is higher than that of the low-elasticity region in its natural state.

The objective is to provide a stretched film that has excellent water vapor barrier properties and heat resistance, as well as excellent transparency. [Solution] The stretched film has a density of 0.950 g / cm³. 3 The main component is polyethylene, and the water vapor transmission rate per 100 μm is 1.0 g / m². 2 The film has a minimum of 10 days, a haze of 20% or less, and a thermal shrinkage rate of 10% or less when heated at 100°C for 10 minutes in the MD (Metal Dynamics) of the film.

This invention relates to the field of medical ceramic materials technology, and more particularly to a method for preparing a zirconia-based medical composite ceramic material. The method includes: adjusting the target number of cycles in response to the slurry mixing state, or compensatingly adjusting the spray granulation process parameters based on slurry state parameters; determining whether the current batch of green bodies has a risk of closed pores based on the green body characteristics, and determining an adjustment feature point based on the actual shrinkage rate variation; stopping the sintering heating and adding a holding stage in response to the adjustment feature point, and determining the intermediate holding temperature and the holding stage duration; obtaining the sintered body phase to determine the tetragonal zirconia retention rate, and determining whether the sintering adjustment strategy matches the characteristics of the current batch of slurry based on the sintered body performance; and adjusting the intermediate holding temperature of subsequent sintering processes based on the tetragonal phase retention rate deviation in response to the sintered body performance. This invention improves the performance of ceramic implants by adjusting the sintering temperature curve based on the characteristics of zirconia-based powder.

The present invention provides a heat-shrinkable film that can adjust the heat shrinkage rate within a predetermined range, thereby exhibiting stable and excellent heat shrinkage properties and effectively preventing wrinkles and other defects. [Solution] A heat-shrinkable film having the longitudinal or widthwise direction as the main shrinkage direction, made of a predetermined resin, and in a predetermined time t1 to t3, t2

A coil component includes an element body, and a coil disposed in the element body. The element body includes a first region and a second region in an element body portion in which the coil is disposed. The first region includes a magnetic material. The second region is located adjacent to and in contact with the first region and includes a material having a shrinkage rate larger than a shrinkage rate of the magnetic material.

This invention discloses an ultra-long service life concrete and its preparation method, belonging to the field of building materials technology. The ultra-long service life concrete, by weight, comprises the following raw materials: 800-1000 parts of cementitious material, 1400-1600 parts of aggregate, 10.5-19 parts of admixture, 20-30 parts of toughening fiber, 0-20 parts of steel fiber, 6-11 parts of PVA fiber, and 160-200 parts of water; the toughening fiber is selected from fibers with a shrinkage rate of 4%-10% at 55-75℃. The concrete of this invention has a service life ≥120 years, a compressive strength ≥80 MPa, withstands ≥500 wet-dry cycles, exhibits excellent crack resistance, corrosion resistance, and impermeability, has widely available components, a simple process, and can be industrially produced. It is suitable for major infrastructure projects and can significantly reduce maintenance and reinforcement costs.

This invention belongs to the technical field of flexible packaging materials, specifically a low-heat-shrinkage biaxially oriented polyethylene film, its preparation method, and its applications. The invention comprises a film body, which is composed of an upper corona layer, a sub-surface layer, an intermediate layer, a sub-inner layer, and a lower corona layer connected sequentially. The polyethylene film of this invention possesses excellent optical and mechanical properties, low high-temperature heat shrinkage, stable surface wetting tension, and uniform thickness, meeting the requirements of high-temperature, high-speed packaging bag forming.

This invention discloses a special synergist for sprayed ultra-high performance concrete (UHPC) in high-altitude and cold regions and its preparation method, belonging to the field of concrete admixture technology. Addressing the technical shortcomings of existing sprayed UHPC in high-altitude and cold environments, such as poor rheological properties, slow setting, low early strength, and large shrinkage, as well as the inability of existing admixtures (including high-altitude accelerators and UHPC thixotropic agents) to synergistically solve these problems, this invention provides a functionally integrated special synergist through a multi-component synergistic design of a composite thixotropic system, an expansion and shrinkage reduction system, a nano-early strength system, and an antifreeze system. This synergist can reduce the rebound rate of sprayed UHPC to below 5% in environments ranging from -20℃ to 5℃, increase the 3-day compressive strength by more than 40%, and reduce the shrinkage rate by more than 30%, effectively meeting the construction and quality requirements of tunnels, slope protection, and other projects in high-altitude and cold regions. The preparation process of this invention is simple, the cost is controllable, and it has broad application prospects.

This invention provides a method for improving joint cracking in inner liner layers, comprising: measuring at least one shrinkage rate value during the production process of the inner liner layer; and adjusting the conveying control parameters of the inner liner layer production line based on the measured shrinkage rate value. In this embodiment, the method for improving joint cracking in inner liner layers quantifies the shrinkage state during the production process of the inner liner layer and adjusts conveying control parameters such as the tension of the floating roller and the speed of the cooling roller based on the shrinkage rate measurement results. This ensures that the inner liner layer completes sufficient stress release and achieves stable conveying on the production line, fundamentally eliminating the cause of joint cracking due to continued shrinkage of the inner liner layer material. By controlling the tension and speed parameters of the conveying process, it ensures that the inner liner layer reaches a dimensionally stable state before entering the molding process, thereby avoiding tensile stress at the joint caused by subsequent material shrinkage. This solves the technical problem of frequent joint cracking of the inner liner layer during the molding of the tire blank in related technologies.

The glass substrate of the present invention is characterized by having a deformation point of 695 to 740°C, a temperature of 104.5 dPa·s of 1300°C or less, a liquid phase viscosity of 104.5 dPa·s or more, a Young's modulus of 78 GPa or more, and a thermal shrinkage rate of 20 ppm or less when heat treatment is performed at 500°C for 1 hour.

An early-strength crack-resistant road concrete and its preparation method are disclosed, belonging to the field of road concrete technology. The early-strength crack-resistant road concrete is composed of silicate cement, coarse aggregate, fine aggregate, polycarboxylate superplasticizer, composite early-strength agent, composite hydrothermal regulator, modified calcium sulfate whiskers, and water. The resulting early-strength crack-resistant road concrete exhibits compressive strength of 45.5~49.1 MPa at 1 day and 60.5~62.2 MPa at 28 days; flexural strength of 3.8~4.4 MPa at 1 day and 6.1~6.6 MPa at 28 days; splitting tensile strength of 1 day and 4.3~4.6 MPa at 28 days; plastic shrinkage rate of 0.013~0.016% at 1 day; restricted drying shrinkage rate of 0.009~0.012% at 28 days; and total porosity of 9.3~10.1%.

The present invention relates to a first stretched polylactic acid film formed from a first film-forming material containing polylactic acid, and a multilayer polylactic acid film including a particle-containing layer, wherein the tensile modulus Ea in the longitudinal direction and the tensile modulus Eb in the width direction of the multilayer polylactic acid film satisfy the formula Ea + Eb > 8.0 GPa, the degree of crystallinity is 40% or more and 90% or less, and when the multilayer polylactic acid film is heated at 150°C for 30 minutes, both the thermal shrinkage rate in the longitudinal direction and the thermal shrinkage rate in the width direction are 10.0% or less. According to the present invention, it is possible to provide a multilayer polylactic acid film with excellent elastic modulus and heat resistance using polylactic acid derived from iomass raw materials and which is biodegradable.

The present invention relates to a stretched polyester film and a method for preparing the same. The stretched polyester film contains a polyester resin in which a diol component and a dicarboxylic acid component are polymerized, and the heat shrinkage rate at 80°C in the main shrinkage direction of the film is 40% or more, and when the film is analyzed by differential scanning calorimetry (DSC) during the first and second heat treatments, the first melting point (T m1 ) and the second melting point (T m2 ) appears. The stretched polyester film according to the present invention has excellent heat shrinkability and improves the efficiency of the recycling process for waste plastic containers.

This invention discloses a ceramic filter element and a method for forming a filter membrane module. The ceramic filter element includes: at least two opposing end surfaces having filter channels; and a surface covered with a potting material, wherein the potting material is an epoxy resin or polyurethane comprising thermoplastic or thermosetting plastics, and the potting material has a penetration depth into the filter element in the range of 0.24 mm to 3.0 mm, a shrinkage rate of less than 1.24% after curing, a tensile strength in the range of 2-65 MPa during curing, and a tensile strength of 55-260 × 10⁻⁶ MPa. ‑6 The coefficient of thermal expansion in the range of / K.

The application discloses a hot-rolled wire rod 30Si2Mn for prestressed steel rods and a preparation method thereof. The hot-rolled wire rod comprises the following components in percentage by weight: C: 0.28%-0.33%, Si: 1.55%-1.70%, Mn: 0.65%-0.80%, P: <=0.020%, S: <=0.020%, Ni: <=0.20%, Cr: <=0.20%, Cu: <=0.20%, H <=0.0003%, and the balance of Fe and inevitable impurity elements. By designing the optimal component system, optimizing the controlled rolling and controlled cooling process, improving the mechanical properties of the wire rod, prolonging the wire rod online slow cooling time by taking process measures, releasing hydrogen and internal stress, controlling the hydrogen content below 3ppm, and achieving the section shrinkage rate above 50% after natural aging, hydrogen-induced delayed fracture of the prestressed steel rod is effectively avoided, and the safety of the construction engineering is improved.

A novel structural adhesive having a low baking shrinkage with excellent anti-corrosion characteristics relating the substrates and the method of making thereof.

A heat-shrinkable polyester film having an improved recyclability and excellent attachment and appearance is provided. The heat-shrinkable polyester film, having a property (A) in which a clumping fraction of a polyester resin or the like is 1.2% or less, a property (B) in which a melting point is 190° C. to 230° C., a property (C) in which a melting heat quantity is 25 to 45 mJ / mg, and properties (D1) to (D4) in which a thermal shrinkage ratio in a main shrinkage direction measured under thermal shrinkage conditions at 60° C., 70° C., and 80° C. for 10 seconds is 0 to 5%, 25 to 50%, 55 to 85%, and a standard deviation of the value of the thermal shrinkage ratio measured at 95° C. to 100° C. for 10 seconds is 1.5% or less.

A laminate for packaging, the laminate including a base material layer, a gas barrier layer including an inorganic oxide layer, and a sealant layer in this order, in which the base material layer is a biaxially stretched polypropylene-based resin film, the sealant layer is a polypropylene-based resin film, a polypropylene-based resin is contained in an amount of 90 mass% or more based on a total amount of the laminate, and a heat shrinkage rate in an MD direction and a heat shrinkage rate in a TD direction of the laminate after being heated in an oven at 150°C for 15 minutes, as determined by the following Equations (1) and (2), are less than 5.0% and less than 10%, respectively: Heat shrinkage rate (%) in MD direction = (Length in MD direction before heating - Length in MD direction after heating) / Length in MD direction before heating × 100...(1) Heat shrinkage rate (%) in TD direction = (Length in TD direction before heating - Length in TD direction after heating) / Length in TD direction before heating × 100...(2)

This invention provides a method for preventing resin cracking in dry-core reactor coils, relating to the field of dry-core reactor manufacturing technology. The method includes configuring a mold system, performing resin pre-curing, dynamic stress-compensated curing, and demolding. By configuring a mold system comprising an elastic buffer layer, a radially adjustable slider group, and a zoned temperature control system, combined with a complete process chain of vacuum casting – gradient temperature-controlled pre-curing – dynamic stress-compensated curing – temperature-controlled demolding, this invention effectively alleviates the internal stress caused by the difference in shrinkage rates between the resin and the metal skeleton or conductors, reduces localized stress concentration caused by rigid mold constraints, and improves the problem of uneven curing caused by improper temperature gradient control. This comprehensively solves the resin cracking problem caused by stress concentration in traditional processes.

Provided in the present application are an adhesive, a bonding structure and a structural component. The adhesive comprises an adhesive filler having an expandable volume, and the adhesive filler comprises a spherical polymer material having a pore structure. During the curing reaction process of the adhesive, the shape of the polymer material can be gradually restored, and the volume of the adhesive filler can be expanded to a certain extent, such that the volume shrinkage caused by a resin main agent, etc. of the adhesive during the curing reaction process can be compensated to a certain extent, and the curing volume shrinkage rate of the adhesive is reduced. The curing volume shrinkage rate of the adhesive containing the adhesive filler is low, the deformation, displacement, internal stress, etc. caused during the curing reaction process are lower, the structure of a structural member using the adhesive is reliable, and the function of a device is stable.

This invention provides a method for preparing gradient HA / ZrO2 bioceramics and the bioceramics themselves, relating to the field of ceramic material preparation technology. The method includes: conducting sintering experiments with different solid contents and different combinations of HA and ZrO2 component ratios to obtain sintering shrinkage data and establishing a sintering shrinkage control model; determining the component ratio of each layer of the ceramic gradient structure according to biomechanical requirements; performing reverse design of the gradient structure based on the component ratio of each layer of the ceramic gradient structure using the sintering shrinkage control model to obtain the required solid content for each layer of the ceramic gradient structure; and preparing HA / ZrO2 composite ceramic slurries with different solid contents according to the required solid content for each layer of the ceramic gradient structure to prepare gradient HA / ZrO2 bioceramics. This invention enables the ZrO2-rich layer and the HA-rich layer to achieve equal shrinkage during co-sintering, fundamentally eliminating interlayer stress and preventing cracking and warping.

This invention relates to the field of hemostatic bandages and discloses a hemostatic bandage roll based on thermo-induced shrinkage. It comprises, from the inside out, an adaptive triggering coagulation layer, a four-dimensional programmable spiral driving layer, a phase change self-locking and drug-releasing layer, and a biodegradable protective surface layer. The four-dimensional programmable spiral driving layer is composed of at least three composite films and possesses independent and controllable shrinkage characteristics in four dimensions: radial shrinkage rate gradient, axial shrinkage rate gradient, spiral tightening force field, and temporal deformation programming. The phase change self-locking and drug-releasing layer contains a polymer matrix dispersed with functionalized phase change wax microcapsules. The adaptive triggering coagulation layer contains a moisture-sensitive shape memory component that lowers the glass transition temperature upon contact with blood ions, gradient-distributed dual-modified zeolite, and a nanofiber network loaded with procoagulant factors. This achieves independent and controllable shrinkage characteristics in four dimensions: radial shrinkage rate gradient, axial shrinkage rate gradient, spiral tightening force field, and temporal deformation programming.

The application relates to the technical field of engine investment casting, in particular to a pump shell ceramic core and a preparation method thereof. The pump shell ceramic core comprises an inner core and an outer core wrapped on the surface of the inner core. The inner core comprises diamond, first quartz glass and bauxite, and the mass ratio of the diamond, the first quartz glass and the bauxite is 4-7:2-5.5:0.5-1. The outer core comprises second quartz glass, mullite and a stabilizer, and the mass ratio of the second quartz glass, the mullite and the stabilizer is 7-9:1-2:0.3-2. The thickness of the outer core is less than that of the inner core, the shrinkage rate of the inner core is less than that of the outer core, the strength of the outer core is greater than that of the inner core, and the thermal deformation amount of the outer core is less than that of the inner core. The core can meet the pouring requirements and size requirements of a large-size oxygen pump shell, and has the characteristics of size stability and high retreatability.

Disclosed are a separator thermal shrinkage rate evaluation device and evaluation method that can easily evaluate the thermal shrinkage rate of a separator.

This utility model relates to the field of testing device technology and discloses a metallized film heat shrinkage rate testing device, including a cabinet. A hot air blower is installed on the cabinet, and an air outlet pipe is connected to the output end of the hot air blower and passes through the cabinet. An oxygen absorption mechanism is provided on the cabinet, and a protective mechanism is provided inside the cabinet. The oxygen absorption mechanism includes an activated copper plate, which is located at the air outlet of the air outlet pipe. This utility model utilizes the oxidation reaction of the activated copper plate with oxygen at high temperature. Combined with a motor-driven rotating rod and linkage structure, the activated copper plate continuously rotates, increasing the contact area with oxygen in the hot air, efficiently consuming oxygen inside the cabinet, ensuring the stability of the physical properties of the metallized film during the testing process, and avoiding interference from oxidation on the heat shrinkage rate test results.