64 results about "Flexural modulus" patented technology

A protective helmet comprising a helmet shell having at least two layers and the helmet shell having a flexural modulus from 50 MPa to 600 MPa as measured using ASTM D 790 B and a non-foamed specific gravity in the range of 0.916 g / cm3 up to 1.60 g / cm3. More than one helmet shell may be combined to provide greater protection to the wearer. The layers may be constructed of an open cell foam, a waterproof coating layer, a separator layer, a flexible layer, a slightly foamed layer, and a cushion layer. A protective facial barrier may be easily removed with use of a locking mechanism which removably secures the facial barrier to the helmet shell. The helmet shells may also be in parts and hinged so that the parts can separate for easy removal of the protective helmet. An adjustment locking mechanism may also tighten and adjust a second helmet shell.

The utility model discloses a composite core mold which comprises a lining layer, a metal reinforcing layer and an outer covering layer which are sequentially connected from inside to outside, the axial length of the metal reinforcing layer is smaller than the axial length of the lining layer and the axial length of the outer covering layer, sealing layers are arranged on the two axial end faces of the metal reinforcing layer respectively, and the inner surfaces of the sealing layers are connected with the outer surface of the lining layer. The outer surface of the sealing layer is connected with the inner surface of the outer covering layer, and the metal reinforcing layer continuously stretches across the heavy load bearing area. The metal reinforcing layer with low cost and high bending modulus is additionally arranged between the two fiber layers, so that compared with a traditional pure fiber core mold, the core mold has the advantages that the bending modulus is higher, the cost is low, the bearing limit is larger, the weight is lighter under the condition of the same bearing performance, and the core mold is easier to transport; meanwhile, the sealing layer is arranged to prevent dissimilar metal pollution, and the winding quality of foil products is guaranteed; by ensuring the roundness of the metal reinforcing layer, the processing efficiency of the outer covering layer is improved, and the process difficulty is reduced.

The invention discloses an asphalt mixture low-temperature crack resistance evaluation method based on equivalent fracture temperature, which comprises the following steps: S1, preparing a standardized test piece by combining microwave pretreatment with a rotary compaction method, eliminating aggregate segregation and simulating a field compaction process; s2, setting a multi-gradient test temperature to carry out a bending test, and synchronously collecting load and mid-span deflection data; s3, calculating fracture energy, flexural modulus and an energy loss coefficient, and constructing a multi-dimensional evaluation system; s4, establishing a coupling correlation model of the test temperature and the three variables; s5, the equivalent fracture temperature is determined through double-feature correlation value calibration and interpolation calculation; and S6, evaluating the low-temperature crack resistance of the material based on the equivalent fracture temperature. According to the method, the representativeness of the test piece is improved by innovatively introducing a microwave pretreatment and rotary compaction process, multi-dimensional quantitative analysis of the low-temperature performance is realized by combining a multi-gradient test and a three-variable coupling model, and the stability and repeatability of equivalent fracture temperature calculation are ensured through a double-feature calibration mechanism.

This application belongs to the field of polymer materials technology, specifically disclosing a modified PC / ABS alloy and its preparation method. By weight, it comprises: polycarbonate: 50-80 parts; ABS resin: 15-40 parts; comb-shaped reactive compatibilizer: 3-8 parts; halogen-free flame retardant: 8-18 parts; nano-talc powder: 3-10 parts; core-shell toughening agent: 2-8 parts; antistatic agent: 0.5-3 parts; antioxidant: 0.2-0.8 parts; lubricant: 0.2-1.0 parts. The tensile strength (56.3-66.8 MPa), flexural strength (88.4-98.5 MPa), flexural modulus (2480-2780 MPa), and notched impact strength (23℃: 52.4-62.5 kJ / m) are also disclosed. 2 -30℃: 28.5~36.2kJ / m 2 Heat distortion temperature (110~125℃), limiting oxygen index (30.0~32.0%), flame retardant rating (V-0), and surface resistivity (5.2×10⁻⁶) are also specified. 9 ~2.5×10 10 In terms of Ω), it is better, and the high performance of PC / ABS alloy is achieved by using reactive compatibilizers, nano talc powder, phosphorus-nitrogen-silicon ternary synergistic flame retardant system, core-shell toughening agent and polymeric antistatic agent.

The present invention belongs to the field of polymers and relates to a multiphase composite material and its preparation method and application. The multiphase composite material comprises polypropylene (A) and a polyolefin elastomer (B) grafted with an olefinic functional monomer; wherein, based on the total weight of the multiphase composite material, the xylene soluble content of the multiphase composite material is 15 to 75 wt%; the content of structural units derived from olefinic functional monomers in a grafted state in the multiphase composite material is 0.4 to 8 wt%; the flexural modulus of the multiphase composite material is 200 to 1000 MPa; and the D50 of the grafted phase derived from the olefinic functional monomer is less than 300 nm. The multiphase composite material of the present invention can take into account both mechanical and electrical properties at higher operating temperatures and is suitable for high temperature and high operating field strength working conditions.

The invention provides a low-temperature thermoplastic fiber composite board as well as a preparation method and application thereof, and belongs to the technical field of composite boards. Low-temperature thermoplastic resin and a fiber material are adopted as raw materials, prepreg is obtained through a softening impregnation method, a melting impregnation method, a powder impregnation method or a fiber and resin mixed impregnation method, the prepreg is put into a mold, hot press molding, cooling solidification and cutting are sequentially conducted, and the low-temperature thermoplastic fiber composite board is obtained. The fiber layer is impregnated in the low-temperature thermoplastic resin for hot press molding, different performance requirements of a target plate are met while the strength is improved by adjusting the spreading and compounding mode of the fiber layer, so that different clinical use requirements are met, low-temperature thermoplastic is achieved by impregnating the low-temperature thermoplastic resin, the bending modulus of the material is remarkably improved, and the material has a good application prospect. The high-strength low-temperature thermoplastic fiber composite board can be directly shaped and corrected on the body of a patient, and can fit the contour of the body of the patient and improve the comfort of the patient.

To provide a resin composition for sealing from which a semiconductor device excellent in product reliability can be obtained.SOLUTION: A resin composition for sealing contains an inorganic filler (A), an epoxy resin (B), and a low stress material (C), wherein a cured product obtained by curing the resin composition for sealing at 175°C for 4 hours has a flexural modulus at 25°C of 5,000 N / mm2 or more and 15,000 N / mm2 or less.SELECTED DRAWING: None

The invention belongs to the technical field of high polymer materials, and discloses a high-modulus and high-weld-mark performance PPS modified material which comprises the following raw materials in parts by weight: 42-59 parts of linear PPS resin; 40 to 50 parts of glass fiber; 0-4 parts of an elastomer; and 0.01 to 0.3 part of a coupling agent. A product prepared from the raw materials disclosed by the invention has relatively high bending modulus and good weld mark performance, and meets the requirements of the frameless glass lifter bracket on key performance indexes of an ideal material; in addition, the invention further provides a preparation method of the material, and the preparation method is simple, easy to implement and suitable for large-scale production.

The invention relates to the technical field of polymer composite materials, in particular to a weather-resistant ultralight composite polymer material and a preparation method thereof, and the weather-resistant ultralight composite polymer material is prepared from the following raw materials in parts by weight: 65-85 parts of weather-resistant alloy matrix resin, 15-35 parts of a continuous glass fiber reinforced material, 1-6 parts of a lightweight functional system and 1.5-3 parts of a weather-resistant stable system. By designing an ASA / PC alloy matrix-continuous glass fiber reinforcement-structural micro-foaming / microbead filling three-in-one composite system, perfect unification of extreme light weight, high strength, high modulus and excellent weather resistance is realized in the polymer matrix composite material, the density of the embodiment is as low as 1.22-1.38 g / cm < 3 >, the bending strength is as high as 210-265 MPa, and the composite material has excellent weather resistance and excellent weather resistance. The bending modulus reaches 10.8-13.5 GPa, and the industrial problems that traditional materials such as aluminum plates are heavy, common plastics are weak, short fiber reinforced plastics are low in performance and obvious in anisotropy, and the requirements for light weight, high strength and outdoor long-term service cannot be met are successfully solved.

The invention discloses a composite material / metal cementing structure II-type fracture performance evaluation method based on correction of end load splitting, and belongs to the field of cementing structure fracture mechanics. Comprising the following steps: 1) designing the thickness of a composite material and a metal cementing piece to obtain a cementing sample; 2) carrying out a clamp correction test on the glued sample to obtain clamp correction parameters; 3) calculating the equivalent bending modulus of the glued sample; (4) carrying out a cementing sample calibration end load splitting test to obtain II-type fracture data; and 5) based on the clamp correction parameters, the equivalent bending modulus, the II-type fracture data and the like, introducing an equivalent crack length, establishing a composite material / metal cementing structure II-type fracture toughness calculation model corrected by the coupling clamp, and solving the cementing sample II-type fracture toughness. According to the method, the thickness size design of the composite material / metal bonding sample, the difference between the material performance and the geometric size and the influence of a test fixture on the II-type fracture toughness calculation result are considered, and the accuracy of the test result is improved.

The present invention relates to a semi-analytical method for determining the fracture toughness and bridging stress of an end-load splitting mode of a composite material laminate, comprising the following steps: (1) designing and manufacturing a composite material specimen for an end-load splitting test; (2) carrying out a delamination test using a test device; (3) recording the test load and displacement to obtain the specimen flexibility; (4) measuring the initial delamination length of the specimen and the delamination length at unloading and the corresponding specimen flexibility to obtain expressions for the bending modulus and shear modulus; (5) deriving an expression for the fracture toughness; (6) deriving an expression for the shear displacement of the prefabricated crack tip; (7) fitting a relationship curve between the fracture toughness and the shear displacement of the prefabricated crack tip; (8) differentiating the relationship curve with respect to the shear displacement of the prefabricated crack tip to obtain the bridging stress; the semi-analytical method proposed in the present invention can be used to determine the fracture toughness and bridging stress in the end-load test of composite materials without the need to monitor the crack length in real time or design additional tests, thereby simplifying the test process, shortening the test cycle, and improving the accuracy of the measurement results.

The present invention relates to a glass run for an automotive door. The glass run (20) includes: a core member (23), a base member (24) provided on the outside of the vehicle body outer side wall portion (21c) and made of a material having a high flexural modulus, and a decorative member (25) fixed to the outside of the vehicle body of the base member (24). When the decorative member is installed on the outside of the vehicle body of the glass run, indentation is suppressed without deteriorating the workability of installation onto the window frame.

A thermoplastic elastomer-based monofilament yarn and a method of manufacturing a thermoplastic elastomer-based monofilament yarn are disclosed. The monofilament yarn comprises a filament comprising a shaft core around which two or more lobes are radially arranged. The filament comprises a thermoplastic elastomer composition comprising a thermoplastic elastomer exhibiting a flexural modulus of about 300 MPa or less as determined at a temperature of about 23 DEG C according to ISO 178: 2019. The yarn exhibits a linear density of from about 1 to about 2000 deniers per filament, and exhibits an elongation at break of about 300% or greater as determined at a temperature of about 23 DEG C according to ASTM D2653-07 (2018).

[Object]The purpose of the present invention is to provide a layered composite that is high in both flexural modulus and moldability.[Solving Means]Provided is a layered composite including a carbon-fiber-reinforced resin in which a chopped strand prepreg obtained by impregnating fiber in resin is oriented in such a manner as to exhibit pseudo-isotropic properties, and a steel plate that is layered on at least one surface of the carbon-fiber-reinforced resin and has a tensile breakage elongation ϕ of equal to or more than 20%, the flexural modulus in a flat plate state obtained in compliance with ASTM D-790 being equal to or more than 30 GPa.

To provide a dental block material using a thermoplastic resin that is easy to process with CAD / CAM and has sufficient hardness for use as a CAD / CAM processed product. [Solution] The dental block material according to the present invention is made of a thermoplastic resin having a Vickers hardness of 20HV0.2 to 35HV0.2 as defined in JIS Z 2244, a flexural strength of 150MPa to 250MPa and a flexural modulus of 2 to 10GPa as defined in JIS T 6517:2011.

The invention belongs to insulating materials, in particular to the field of cable insulating materials, and relates to a polybutylene in-kettle alloy, application and a cable with a thermoplastic insulating layer. The polybutylene in-kettle alloy has the following characteristics: the content of n-heptane soluble substances is 20-75wt%; the intrinsic viscosity ratio of a soluble substance to an insoluble substance of n-heptane is 0.2-4; the melt flow rate under the conditions that the temperature is 230 DEG C and the load is 2.16 kg is 0.1 to 6g / 10min; the elongation at break is greater than or equal to 250%; the tensile strength is greater than 15MPa; and the bending modulus is 400 to 700 MPa. The polybutylene in-kettle alloy disclosed by the invention has both mechanical properties and electrical properties at a relatively high working temperature, has good transparency, and can be used as a cable insulation layer material to obtain a thermoplastic cable with excellent comprehensive properties.

Disclosed are a housing of a sound generation apparatus, a sound generation apparatus, and an electronic device. The housing comprises a reinforcing portion, the thickness of the reinforcing portion is less than or equal to 0.3 mm, and the reinforcing portion is formed by injection molding of a polyamide composite material consisting of carbon fibers and a polyamide. In the reinforcing portion, the mass ratio of the carbon fibers to the polyamide is 0.42-1, the density of the reinforcing portion is 1.2 g / cm3-1.45 g / cm3, and the flexural modulus of the reinforcing portion is 20 GPa-40 GPa. In the present invention, the reinforcing portion is formed by injection molding of the polyamide composite material, and the polyamide composite material comprises the carbon fibers and the polyamide mixed together. The carbon fibers can significantly improve the strength and modulus of the polyamide composite material. The housing does not need to be injection-molded containing a steel piece for thinning and improving the structural strength, the housing has good structural consistency and sealing performance, and the structural strength meets actual use requirements. Furthermore, the processing process of the housing is simplified, and the product yield is high.

This invention relates to the field of propylene polymerization, and discloses a polypropylene, its preparation method, and its applications. The polypropylene has a molecular weight distribution of 6-20; at 230℃, a melt index of 0.1-10 g / 10 min with a loading of 2.16 kg; an isotactic index ≥97%; a fraction with a weight-average molecular weight M ≥ 5 million g / mol containing ≥1 wt%, a fraction with 1000 g / mol < M < 50000 g / mol containing 5-30 wt%, a fraction with 50000 g / mol ≤ M < 5 million g / mol containing 60-90 wt%, and a fraction with M ≤ 1000 g / mol containing <1 wt%; a melt strength ≥0.4 N at 230℃; a heat distortion temperature ≥95℃; and a flexural modulus ≥1800 MPa. This polypropylene exhibits high isotacticity, a wide molecular weight distribution, high flexural modulus, and also high melt strength and heat resistance.

Proposed is a holding tool that satisfies physical properties of a flexural modulus in a circumferential direction of 50 GPa or more and a warpage of not more than 0.5 mm. The holding tool is configured using carbon fibers and a resin, has a substantially annular shape, and includes a first resin layer. In the first resin layer, the longitudinal direction of the fibers is aligned along the circumferential direction of the substantially annular shape.

The present invention provides a molded article having high flexural modulus, excellent heat resistance and low-temperature impact resistance, and a resin composition from which the molded article can be obtained. The resin composition comprises a polyarylene ether ketone and a fluorine-containing elastomer and an inorganic filler, the proportion of the fluorine-containing elastomer to the total of the volume of the polyarylene ether ketone and the volume of the fluorine-containing elastomer is 1 to 45% by volume, the proportion of the inorganic filler is 1 to 50% by mass, and the load deflection temperature under a load of 1.82 MPa based on ASTM D648 is higher than that of a comparative composition, and a molded article of the resin composition. The comparative composition is a resin composition comprising a polyarylene ether ketone and a fluorine-containing elastomer but not containing an inorganic filler, the type of the polyarylene ether ketone, the type of the fluorine-containing elastomer and the volume proportion of the fluorine-containing elastomer to the total of the volume of the polyarylene ether ketone and the volume of the fluorine-containing elastomer are all the same as those of the resin composition except for the presence or absence of the inorganic filler.

A tennis ball may include a non-foamed thermoplastic core defining an internal volume, the core having an outer meltable surface. The core may include a thermoplastic material having a specific gravity of 0.86 to 1.38, a flexural modulus of 2.0 to 50.0 MPa, and a Shore D hardness of 10 to 70. The thickness of the thermoplastic material may be between 3.0 and 8.0 mm and configured to maintain dimensional stability at internal pressures of between zero and 15 psi. The tennis ball may further include a felt cover at least partially covering the core, wherein the tennis ball conforms to ITF and USTA size, weight, deformation and rebound requirements.

The purpose of the present disclosure is to provide shock-absorbing flooring material (flooring material) that maintains an absorption effect of a soft layer while also having excellent load bearing properties. A flooring material (1) according to the present embodiment comprises a flooring upper material (11), a flooring substrate material (12) provided below the flooring upper material (11), and an intermediate material (13) provided between the flooring upper material (11) and the flooring substrate material (12). The flooring substrate material (12) is formed from a resin material and has a foam structure. The intermediate material (13) is formed from a material that includes a thermoplastic resin and an inorganic filler. In a three-point bend test in accordance with JIS K7074, the strain (ε(σmax)) at which bending strength is a maximum is not less than 0.5%, and the flexural modulus is not less than 1 GPa.

Provided is a member for machining which, when machined by shaving, cutting, or drilling, for example, using a mechanical tool, exhibits excellent machinability and suppresses generation of burrs.　The member for machining is composed of a molded object of a resin composition containing a thermoplastic resin (A) and a reinforcing material (B), and is characterized in that: the thermoplastic resin (A) is an amorphous thermoplastic resin; the reinforcing material (B) is an inorganic reinforcing material having a Mohs hardness of 5 or less; and a machinability parameter defined by equation (1) from the fracture toughness K1c and flexural modulus of the member for machining is 15 m1 / 2 to 100 m1 / 2.　Equation (1): Machinability parameter = (fracture toughness K1c) / (flexural modulus)×105

To provide a medical female connector of a novel structure capable of suppressing damage when connected to a male connector.SOLUTION: The medical female connector 10 includes a first member 16 that constitutes a connection portion of the male connector 14 and a second member 18 that constitutes a connection portion of the tube 12, the first member 16 and the second member 18 being separately formed and fixed to each other, the first member 16 being made of a material having a lower flexural modulus than the second member 18. The second member is provided at a position away from the tip of the first member 16 by 2. 5mm or more.SELECTED DRAWING: Figure 4

The present invention relates to a pushable elongated reinforcing member (R) comprising a plurality of continuous fibers that are or include unconsolidated fibers, the plurality of continuous fibers forming a first group (F) having a first flexural modulus, and at least one elongated element (E) having a second flexural modulus greater than the first flexural modulus. At least one elongated element (E) is connected to the first group of continuous fibers (F) and transmits a pushable compressive force from the at least one elongated element (E) to the first group of continuous fibers (F) in its longitudinal direction. The present invention also relates to a method for producing a part (P), the method comprising the steps of obtaining a body (B) including a tubular cavity (T), and introducing the pushable elongated reinforcing member (R) and a liquid matrix material into the tubular cavity (T) and allowing the matrix material to solidify.

An expanded bead having a mass ratio of an expanded core layer to a covering layer of from 97:3 to 88:12, a bulk expansion ratio of 5 times or more and 45 times or less, wherein the covering layer is composed of PE-LLD, the PE-LLD has a melting point of 105° C. or higher and 130° C. or lower, and the PE-LLD has a flexural modulus Ms of 120 MPa or more and 600 MPa or less. A logistics cushioning material composed of an expanded beads molded article, which has a molded article expansion ratio of 5 times or more and 45 times or less, a maximum bending strength of 0.3 MPa or more, a product of tensile strength and tensile elongation of 18 MPa·% or more, and a dynamic friction coefficient with respect to a polyvinyl chloride sheet of 0.4 or more and less than 0.7, and a static friction coefficient with respect to a polyvinyl chloride sheet of less than 1.0.

A flexible tube includes at least a first resin layer which is composed of a fluororesin, having a thickness of 0.05 to 0.5 mm and accounting for 1 to 16% of a total thickness of the flexible tube, and a second resin layer composed of a thermoplastic resin different from the first resin layer, wherein the fluororesin has a free volume between molecular chains such that the flexural modulus dependent on number average molecular weight is 500 to 1200 MPa, the thermoplastic resin of the second resin layer has a flexural modulus of 200 to 1300 MPa, the flexural modulus is measured based on ASTM D790, and an amount of eluted substances obtained by analyzing an eluate obtained after putting heptane as a solvent into the flexible tube and allowing the flexible tube to stand at 25° C. for 60 minutes is 150 ppm or less.

This invention provides a gradient ballistic and impact-resistant composite material, comprising, in sequence, a first composite material layer, a second composite material layer, and a third composite material layer; wherein the modulus of the first, second, and third composite material layers decreases sequentially; the modulus includes flexural modulus and storage modulus. This gradient composite material, with its modulus (elastic modulus and storage modulus) decreasing sequentially from front to back and its flexibility gradually increasing, conforms to the mechanical response law under high-speed impact loads. It can fully utilize the characteristics of each material layer, effectively improving the ultimate V50, and has broad application value in the field of armor protection.

The technical problem to be solved by the present invention is to provide a tube for a semiconductor manufacturing device, which has excellent adhesiveness to a joint and excellent flexure resistance when the thickness is small. A tube for a semiconductor manufacturing device, which contains a fluorine-containing polymer, and wherein the fluorine-containing polymer satisfies the following requirements (A): the creep permanent strain of the fluorine-containing polymer is 4.5% or more, and the creep rate of the fluorine-containing polymer as measured by a tensile creep test is 2.60% or less; the flexural modulus of elasticity of the fluorine-containing polymer is 1100 MPa or less, the tensile strength of the fluorine-containing polymer is 45 MPa or more, and the tensile elongation of the fluorine-containing polymer is 360% or more.

The seal ring has an outer peripheral surface, an inner peripheral surface, a first side surface, and a second side surface. The seal ring includes an outer ring having an outer ring outer peripheral surface that constitutes the outer peripheral surface and a first outer ring side surface that constitutes the first side surface, and an inner ring having an inner ring inner peripheral surface that constitutes the inner peripheral surface and a first inner ring side surface that constitutes the second side surface. One of the outer ring and the inner ring is formed from a first resin having a flexural modulus of elasticity of 700 MPa or more, and the other is formed from a second resin having a flexural modulus of elasticity of less than 700 MPa. Of the outer ring and the inner ring, the one formed from the first resin has a joint.