40 results about "Linear expansion coefficient" patented technology

This invention relates to the field of polymer materials technology. It discloses a low-linearity polypropylene-talc composite material, its preparation method, and its applications. The material comprises the following raw materials in weight percentages: polypropylene resin: 50-65%, modified talc: 15-25%, ethylene-octene copolymer resin: 10-15%, modified flat glass fiber: 5-15%, basic magnesium sulfate whiskers: 3-10%, heat stabilizer: 0.3-1%, and antioxidant: 0.1-0.5%. This composite material exhibits advantages such as a low coefficient of linear expansion, excellent surface tension, and superior mechanical properties.

The present application relates to the field of polyolefins, in particular, to a polypropylene resin, a polypropylene resin composition and respective preparation methods thereof. The polypropylene resin comprises: (a) component A: 60-80 wt%, a high crystalline homopolymer polypropylene, the isotactic pentad fraction of which is greater than or equal to 96%; (b) component B: 20-40 wt%, an ethylene-propylene elastomeric copolymer, the ethylene-propylene elastomeric copolymer containing 50-70 wt% ethylene structural units and 30-50 wt% propylene structural units, based on the total weight of the ethylene-propylene elastomeric copolymer; the molar fraction of ethylene / ethylene / ethylene sequences EEE in the polypropylene resin is not less than 15%; the ratio of the melt mass flow rate of the component A and the polypropylene resin under the action of a 2.16 kg load at 230℃ is 1.5-3.5:1. The final polypropylene resin composition has the characteristics of low shrinkage, high modulus, high heat distortion temperature and low linear expansion coefficient.

This application discloses a polypropylene composite material, its preparation method, and its application, relating to the field of polymer materials technology. This application provides a polypropylene composite material comprising the following components in parts by weight: 40-95 parts PP resin, 1-5 parts silica gel adsorbent, 1-5 parts carbon nanotubes, and 1-20 parts filler; wherein the pore size of the silica gel adsorbent is D1, and the outer diameter (D50) of the carbon nanotubes is D2, with 0 ≤ D1 - D2 ≤ 17 nm. This application provides a polypropylene composite material that, through the synergistic effect of the silica gel adsorbent and carbon nanotubes, solves the material emission problem and forms a physically cross-linked structure in the system to achieve a low linear expansion coefficient and excellent scratch resistance.

The present disclosure provides a thermosetting resin composition which, when the thermosetting resin composition and a semi-cured product thereof are heated, exhibits a property of first maintaining a low melt viscosity state and then rapidly becoming curable, which improves the storage stability of the thermosetting resin composition and the semi-cured product thereof, and reduces an increase in a linear expansion coefficient and suppresses a decrease in a glass transition temperature of a cured product, which is often associated with heating. The thermosetting resin composition contains a radically polymerizable unsaturated compound and an organic radical compound.

The present application relates to the technical field of plate performance testing, and particularly relates to a kind of plate edge durability test method;It comprises the following steps: cutting plate sample into standard size test piece;Using thermal mechanical analyzer respectively test the linear expansion coefficient of test piece edge material and base material;The test piece after processing is placed in environmental test chamber and is subjected to cyclic test;Test piece is fixed on load testing device, and constant load is applied along the direction perpendicular to the edge interface of plate plane;Using flatness tester to measure the overall warping of test piece, compare with the warping data before testing, calculate the warping change, evaluate the actual effect of plate balanced laminating process on preventing warping after edge sealing;Using weighted scoring method to calculate the comprehensive score of edge durability;Realize that the long-term durability of plate edge sealing under complex working conditions can be comprehensively and accurately evaluated, and provide scientific and comprehensive technical support for edge sealing process optimization, material selection and structure design.

The embodiment of the present application provides an optical lens for temperature drift compensation and a manufacturing method thereof. The optical lens comprises: a lens body having a first linear expansion coefficient A; and a compensation element located in the lens body and having a second linear expansion coefficient B; wherein, based on a preset temperature gradient AT, a preset back focus offset AD of the lens body under the preset temperature gradient AT, a preset compensation amount AX of the lens body under the preset temperature gradient AT, the first linear expansion coefficient A and the second linear expansion coefficient B satisfy the following rules: when AT>0, if AD>0 and AX<0, then B<A; if AD>0 and AX>0, then B>A; if AD<0 and AX<0, then B>A; if AD<0 and AX>0, then B<A; when AT<0, if AD>0 and AX<0, then B>A; if AD>0 and AX>0, then B<A; if AD<0 and AX<0, then B>A; and if AD<0 and AX>0, then B

This invention discloses a silicone foam sheet and a battery module and battery pack containing the same, belonging to the technical field of silicone foam materials. The linear expansion coefficient α of the foam sheet's pore diameter satisfies 1≤α≤8, and the linear contraction coefficient β of the foam sheet's pore wall thickness satisfies 4≤β≤9. This invention enables the silicone foam sheet to have more spatial gaps and a lower thermal conductivity under room temperature conditions; it also enables the silicone foam sheet to maintain an intact pore structure and high strength after sintering at high temperatures, thus preventing breakage. Therefore, the silicone foam sheet of this invention has good thermal insulation performance; simultaneously, the silicone foam sheet of this invention also exhibits good cushioning performance.

The application relates to the technical field of automobile exterior materials, in particular to a preparation method of a low-linear-expansion-coefficient modified PP composite material for automobile exterior decoration, which is composed of the following components in parts by weight: 65-75 parts of homopolymerization and copolymerization compounded polypropylene, 22-28 parts of a composite modified inorganic filler composed of talcum powder and short glass fiber which are synergistically modified by a double silane coupling agent and adipic acid, and 4-6 parts of a MAH-g-PP and EMA-GMA compounded compatilizer. The composite modified inorganic filler and the nano auxiliary filler compounded system are adopted in the application, and a special filler surface treatment process is matched, so that the combination strength of the filler and the resin matrix is remarkably improved, the synergistic effect of the filler is fully exerted, the linear expansion coefficient of the material is effectively reduced, and the size stability of the automobile exterior decoration part during long-term use is ensured.

A method for determining the adiabatic temperature rise of high fly ash concrete, which can accurately reflect the temperature change of high fly ash concrete, take into account the early age and later period, and more flexibly and accurately simulate the actual hydration heat process of high fly ash concrete. It comprises: (1) obtaining the thermal conductivity, temperature conductivity, bulk density, specific heat, linear expansion coefficient and Poisson's ratio of high fly ash concrete through experiments, and obtaining the initial adiabatic temperature rise parameters of high fly ash concrete through adiabatic temperature rise test; (2) determining the first part of the model first, using the measured data of the dam body and combining with simulation calculation to obtain the first part of the model; (3) using the thermometer pre-buried in the structure to measure the temperature rise value of the concrete after reaching the minimum temperature in the actual project, and according to the relationship between the data and the age, the second half of the model is analyzed by regression analysis to obtain the adiabatic temperature rise parameters of the second half of the model formula; (4) obtaining the complete formula, and calculating the concrete temperature field according to the formula.

An optical laminate is provided that enables an image display device with excellent visual confirmability via optical components having polarizing effects, and that suppresses the generation and / or propagation of cracks. An embodiment of the optical laminate of the present invention sequentially comprises a first retardation film, a polarizer, and a second retardation film. The in-plane phase difference Re(550) of the first retardation film is 80 nm or more and 160 nm or less. The average linear expansion coefficient of the first retardation film at -40°C to 85°C is 4.5 × 10⁻⁶. ‑5 / ℃ below.

Position detection device comprising the following: a sensor (31, 32, 33) containing a detection unit (311, 321, 331) configured to output a signal corresponding to a change in the position of a detection object (3), and a resin section (314, 324, 334) covering the detection unit (311, 321, 331); and a cover (60) formed from a resin having a linear coefficient of expansion that differs from the linear coefficient of expansion of the resin section (314, 324, 334) to cover part of the resin section (314, 324, 334) so ​​that the resin section (314, 324, 334) protrudes, wherein the Harz section (314, 324, 334) a prominent surface (401, 402, 403) facing a direction in which the resin section (314, 324, 334) protrudes, and a side surface (411, 412, 413, 414, 415, 416) that is connected to the protruding surface (401, 402, 403), the cover (60) a covering surface (630) facing the direction in which the resin section (314, 324, 334) protrudes, an inclined surface (631, 632, 633, 634, 635, 636) that intersects each of the cover surface (630) and the side surface (411, 412, 413, 414, 415, 416) to intersect each of the cover surface (630) and the side surface (411, 412, 413, 414, 415, 416) to be connected, and a projecting section (651, 661, 662, 663, 664) that projects in the direction in which the Harz section (314, 324, 334) protrudes, the projecting section (651, 661, 662, 663, 664) is connected to the side surface (411, 412, 413, 414, 415, 416) and the inclined surface (631, 632, 633, 634, 635, 636), the side surface (411, 412, 413, 414, 415, 416) is a first side surface (411, 412, 414, 415), the inclined surface (631, 632, 633, 634, 635, 636) is a first inclined surface (631, 632, 634, 635), the Harz section (314, 324, 334) a second side surface (412, 413, 415, 416) which is connected to the protruding surface (401, 402, 403) and the first side surface (411, 412, 414, 415), and a corner section (421, 422, 423, 424) which is a boundary section between the first side surface (411, 412, 414, 415) and the second side surface (412, 413, 415, 416), wherein the cover (60) further comprises a second inclined surface (632, 633, 635, 636) which intersects each of the cover surface (630) and the second side surface (412, 413, 415, 416) in order to be connected to each of the cover surface (630) and the second side surface (412, 413, 415, 416), and the projecting section (661, 662, 663, 664) with each of the first side surface (411, 412, 414, 415), the second side surface (412, 413, 415, 416), is connected to the corner section (421, 422, 423, 424), the first inclined surface (631, 632, 634, 635) and the second inclined surface (632, 633, 635, 636).

The application provides a metal thermal expansion coefficient measuring device and a measuring method thereof, and belongs to the technical field of measuring devices.The metal thermal expansion coefficient measuring device is composed of a mechanical module, a visual module, a temperature control module and an algorithm module, can accurately measure the thermal expansion amount of the longitudinal height and the transverse diameter of a metal cylindrical sample, and can further calculate the linear expansion coefficient and the volume expansion coefficient, and is a non-contact, high-precision, low-cost and intuitive measuring system.The thermal expansion measuring method of the device utilizes the combination of software and hardware to realize automatic measurement, can realize non-contact high-precision thermal expansion measurement, the measuring process is visualized, the experimental intuitiveness is effectively improved, and the synchronous measurement of axial expansion and radial expansion is realized.

An electrical junction box includes a housing constituted by an upper case and a lower case that have different linear expansion coefficients from each other, a busbar fixed to the upper case being in contact with a gap filler adhered to an inner surface of the lower case, and the electrical junction box includes a plurality of connection members that are provided in a vicinity of the gap filler and connect an inner surface of the lower case and an inner surface of the upper case that faces the inner surface.

This utility model relates to the field of linear expansion coefficient measurement technology, and discloses a metal rod linear expansion coefficient measuring instrument, including an electromagnetic induction heating temperature measuring device, a micro-displacement measuring device platform, and a main unit. The electromagnetic induction heating temperature measuring device includes an electromagnetic induction heating coil and a real-time temperature measuring sensor for the metal rod. The micro-displacement measuring device platform includes a metal shell and an insulating built-in frame, a primary coil winding, a secondary coil winding one, a secondary coil winding two, and an iron core component located inside the metal shell. This utility model combines LVDT-based micro-displacement measurement technology with electromagnetic induction heating for experimental measurement of the linear expansion coefficient of metal rods. LVDT-based micro-displacement measurement technology has the advantages of high resolution, fast dynamic response, small size, light weight, simple structure, portability, and few restrictions on the material of the measured object. Electromagnetic induction heating enables rapid heating, good temperature uniformity, and high temperature control accuracy.

In a wound electrode assembly, a first electrode and a second electrode having a different polarity from the first electrode are wound in a flat shape with a separator interposed between the first electrode and the second electrode. The wound electrode assembly includes: a first resin member wound around a winding axis; and a second resin member wound around the winding axis along the first resin member on the inner side of the first resin member. The linear expansion coefficient of the first resin member is greater than the linear expansion coefficient of the second resin member.

The electronic component includes functional elements with electrodes and a busbar electrically and mechanically connected to the electrodes. The busbar includes a main body and a connecting conductor integrally formed with the main body. The connecting conductor has: a first arm and a second arm directly connected to the main body; and a first connecting portion and a second connecting portion, each corresponding one-to-one with the first and second arms, protruding from the distal ends of the first and second arms respectively, and connected to the electrodes by conductive members. When the center-to-center distance between the connection points of the main body and the first arm, and between the main body and the second arm is set as A, and the center-to-center distance between the first connecting portion and the second connecting portion is set as B, A > B holds when the linear expansion coefficient of the functional element is greater than that of the busbar.

A pulverizing roller (13) includes a support portion rotatably supported with respect to a housing, and a ring-shaped roller portion (49) fixed to the support portion and pulverizing solid fuel between the roller portion (49) and a pulverizing table. The roller portion (49) includes a base portion (51) fixed to a journal housing (48), and a ceramic portion (52) provided to an outer peripheral surface of the base portion (51), the ceramic portion (52) having a different linear expansion coefficient from that of the base portion (51) and having superior wear resistance to that of the base portion (51), and a boundary surface (53) between the base portion (51) and the ceramic portion (52) in a cross section of the roller portion (49) cut by a plane including an extension direction of a rotational center axis of the roller portion (49) has a curved portion (53a) protruding toward an outer peripheral surface (49a) of the roller portion (49) at an end surface (13b) side close to a maximum wear point (P1) of the outer peripheral surface (49a) of the roller portion (49) compared to the boundary surface (53).

The application discloses a low-water-absorption low-warp flame-retardant polyamide composition which is prepared from the following components in parts by weight: polyamide resin 50-75 parts, polyphenyl ether 25-50 parts, glass fiber 10-60 parts, composite compatilizer 3.6-12.6 parts, flame retardant 15-40 parts, synergist 2-15 parts, nano oxide 0.5-2 parts, antioxidant 0.2-0.5 parts, lubricant 0.5-1.5 parts. The application reduces the linear expansion coefficient and warping degree of nylon 6 composite material by compounding polyphenyl ether and glass fiber, improves the compatibility between polyamide / polyphenyl ether and glass fiber, and the processing performance and mechanical properties of the polyamide composition by compounding polyphenyl ether grafted maleic anhydride, hydrogenated styrene-isoprene copolymer grafted maleic anhydride, silane coupling agent and polyhydric alcohol.

The objective is to provide hearth rolls with excellent build-up resistance and crack resistance. [Solution] A hearth roll in which the roll surface in contact with a steel plate is covered with a thermal spray coating, wherein the thermal spray coating comprises a top coat layer having build-up resistance (provided that the chromium oxide content is 0% by mass) and an undercoat layer consisting of a cermet thermal spray coating containing 20% ​​to 30% by mass of chromium, and when the linear expansion coefficient of the roll substrate is A, the linear expansion coefficient of the top coat layer is B, and the linear expansion coefficient of the undercoat layer is C, B / A is 0.35 or more and 0.5 or less, and C / A is 0.55 or more.

This invention discloses a polypropylene material with a low linear expansion coefficient, prepared from the following components in parts by weight: 74-80 parts polypropylene resin, 5 parts compatibilizer, 10-15 parts mineral filler, 0.2-0.4 parts composite antioxidant, and 0.2-0.3 parts nucleating agent; wherein the compatibilizer is a compound of polypropylene grafted with maleic anhydride and ethylene-methyl acrylate copolymer. This invention selects polypropylene grafted with maleic anhydride (PP-MAH) and ethylene-methyl acrylate copolymer (EMA) as compatibilizers and controls their ratio to obtain a polypropylene material with a low linear expansion coefficient. This material has both a low linear expansion coefficient and a low density, with a density of 1.02 g / cm³. 3 At that time, the linear expansion coefficient can reach 60*10. ‑6 M / (M*K).

The present application relates to a kind of sliding bearing and the control method of its radial clearance variation due to thermal expansion.The sliding bearing includes bearing bush;The bearing bush includes more than three first shell;The first shell is uniformly distributed along the inner circumferential wall of bearing seat or bearing outer ring;The first shell and its corresponding bearing seat or bearing outer ring are matched or fixed with plane.In the use of sliding bearing at high temperature and low temperature, the material can be selected according to the linear expansion coefficient and the corresponding structure and size are adjusted, the purpose of effectively controlling the radial clearance variation without gap compensation structure is realized, and the technical problems in the field are solved.The present application has the outstanding characteristics of simple and reasonable structure, cost saving and safe use, especially meets the performance requirements of sliding bearing in high temperature or low temperature and large temperature change occasions.

A laminate having a heat-resistant coating layer (A) and an olefin resin layer (B1) mainly composed of an olefin resin (b1), the laminate satisfying (1) and (2), etc. (1) The difference between the dynamic viscoelasticity (DMA) value E'1 (MPa) of the laminate having a heat-resistant coating layer (A) on one or both sides of the olefin resin layer (B1) at temperature T1 (°C) and the dynamic viscoelasticity (DMA) value E'2 (MPa) of the olefin resin layer (B1) alone at temperature T1 (°C) is 1 (MPa) or more. (2) The percentage of the linear expansion coefficient (CTE1) obtained by dividing the value of the linear expansion coefficient (CTE2) of the olefin resin layer (B1) with a heat-resistant coating layer (A) on one or both sides of the olefin resin layer (B1) at temperature T1 (°C) by the value of the linear expansion coefficient (CTE2) of the olefin resin layer (B1) at temperature T1 (°C) is 10% to 100%. T1 (°C) = Melting point of olefin resin layer (B1) (°C) - 35 (°C) E'1 (MPa) - E'2 (MPa) ≥ 1 (MPa) 10 (%) ≤ ((CTE1) / (CTE2)) × 100 ≤ 100 (%).

An electronic component module (101) comprise:s a substrate (1) that has a first surface (1a); a first electronic component (3a) that is mounted on the first surface (1a); a first sealing resin layer (6a) that seals the first surface (1a) and the first electronic component (3a); and a first plate (5) that covers the surface of the first sealing resin layer (6a) on the side away from the first surface (1a). The linear expansion coefficient of the substrate (1) is greater than the linear expansion coefficient of the first plate (5), and when the combination of the first sealing resin layer (6a) and the first electronic component (3a) is a first composite layer (41), the linear expansion coefficient of the first composite layer (41) is greater than the linear expansion coefficient of the substrate (1).

This application discloses an axial force adjustment device for counteracting rotor self-weight, an aero-engine, and an aircraft. The axial force adjustment device includes a centrifugal impeller, with a radial expansion casing on the outer side of the impeller. An inner casing is fixedly connected to the bottom of the radial expansion casing. An air bleed adjustment mechanism is provided on the back cavity side of the centrifugal impeller. The air bleed adjustment mechanism includes a flow guide baffle and an impact baffle. The flow guide baffle and the back cavity side of the centrifugal impeller form a first cavity. A movable sealing device is provided at the bottom of the flow guide baffle, which seals with the radial expansion casing, forming a second cavity between the flow guide baffle and the radial expansion casing. The linear expansion coefficient of the material used for the flow guide baffle is smaller than that of the material used for the radial expansion casing. This application creates a flow gap by utilizing the difference in linear expansion coefficients between the radial expansion casing and the flow guide baffle, effectively increasing the forward axial force in the impeller back cavity, thus counteracting the rotor self-weight when the engine changes from a horizontal to a vertical position. The structure is simple and the cost is low.

Provided is a transparent electroconductive film that does not readily crack or turn white, even when used as one element of a layered body. [1] A transparent electroconductive film according to an embodiment of the present invention comprises a base material and an electroconductive layer that is provided on at least one side of the base material, the linear expansion coefficient of the base material being less than 6.0×10-5 / °C. [2] The electroconductive layer of the transparent electroconductive film of [1] may include metal nanowires or a metal mesh.

Provided is a two-component liquid resin composition comprising a first liquid and a second liquid, wherein: the first liquid contains an epoxy resin (A) and an inorganic filler (C); the second liquid contains a curing agent (B) and the inorganic filler (C); and the stress coefficient ɑxE, calculated as the product of a linear expansion coefficient ɑ and a flexural modulus E, is at most 190.

Provides is an optical component for EUV lithography, comprising a media-carrying pipe system for operation in a vacuum environment, wherein the media-carrying pipe system comprises at least one connection region between a metallic section and a section comprising or consisting of a silicon-containing substrate material having a coefficient of linear expansion of less than 3 ppm / K. The connection region is at least partially enclosed by an externally adjoining sealing device, wherein the sealing device comprises a sealing element and a fixing device attaching the sealing element to the connection region and wherein the sealing element comprises an elastomer.

The present disclosure is a wound electrode body. The wound electrode body is a wound electrode body in which a first electrode and a second electrode having a polarity different from that of the first electrode are wound apart by a separator in a flat shape. The wound electrode body includes: a first resin member wound around a winding axis; and a second resin member wound around the winding axis along the first resin member on the inner side of the first resin member. The linear expansion coefficient of the first resin member is greater than the linear expansion coefficient of the second resin member.

The present application relates to the technical field of high polymer material modification, in particular to a polypropylene composite material and a preparation method and application thereof, and provides a polypropylene composite material, which comprises the following components in parts by weight: 63-82 parts of polypropylene resin, 13-32 parts of halloysite nanotubes with amino surface modification, and 3-14 parts of a compatilizer; the halloysite nanotubes have an aspect ratio of 20-70, and the compatilizer is a maleic anhydride grafted compatilizer. The polypropylene composite material has excellent heat conductivity, moisture and heat aging performance and low linear expansion coefficient, and solves the defects of the existing polypropylene composite material in the preparation of automobile structural parts.

This power storage device comprises: a power storage pack that has a power storage module including a plurality of electrodes laminated along a first direction; a case that houses the power storage pack; and a potting material that fills a space between the outer surface of the power storage pack and the inner surface of the case when viewed in the first direction. The potting material is composed of a plurality of filling parts along the outer surface when viewed in the first direction. The linear expansion coefficient of the potting material is larger than the linear expansion coefficient of the power storage pack.