47 results about "Flexural modulus" patented technology

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 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 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.

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.

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.

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 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.

To provide a new method for producing a composite member having high flexural strength and flexural modulus, and to provide a new composite member used as a reinforced composite member having high flexural strength and flexural modulus or as an intermediate material for producing such a reinforced composite member.SOLUTION: A method for manufacturing a composite member includes preparing a suspension of an aggregate by co-aggregating flake-like particles and thermosetting or thermoplastic particles in a liquid to form the aggregate, making a papermaking product by papermaking the suspension, and hot press molding the papermaking product.SELECTED DRAWING: Figure 1

This sealing ring comprises: a first ring having an inner circumferential surface and an outer tapered surface that is inclined with respect to the inner circumferential surface; and a second ring having an outer circumferential surface and an inner tapered surface that is inclined with respect to the outer circumferential surface and that faces the outer tapered surface. One of the first ring and the second ring is formed of a first resin having a flexural modulus of less than 700 MPa, and the other is formed of a second resin having a flexural modulus of at least 700 MPa. When the first ring is formed of the first resin, the seal ring seals fluid on the outer circumferential surface side of the second ring. When the second ring is formed of the first resin, the seal ring seals fluid on the inner circumferential surface side of the first ring.

Thermoplastic compositions include: a) from about 30 wt% to about 75 wt% of a polymer base resin including polycarbonate, polybutylene terephthalate, polyamine, polyphenylene sulfide, polyetherimide, polyphenylene oxide, copolymers thereof, or a combination thereof; b) from about 5 wt% to about 20 wt% of a carbon fiber having a tensile modulus of at least 200 GPa; c) from about 5 wt% to about 45 wt% of a first reinforcing filler including a flat glass fiber, a round glass fiber, or a combination thereof; and d) from about 0.1 wt% to about 2 wt% of at least one additional additive. The composition has a density of no more than 1.60 g / cm3, a flexural modulus of at least 12 GPa, and an EMI shielding effectiveness of no more than 35 dB at a frequency of from 1 GHz to 6 GHz.

The invention relates to the technical field of polymers, in particular to a PC / PET alloy material and a preparation method thereof. The PC / PET alloy material comprises the following preparation raw materials in parts by weight: 30-80 parts of PC resin; 10 to 60 parts of PET resin; 0.01 to 5 parts of a modified toughening agent; and 0.01 to 40 parts of a processing aid. Wherein the modified toughening agent is prepared from the following raw materials: a first chain extender and MBS (Methyl Methacrylate-Butadiene-Styrene). The first chain extender reacts with MBS, so that the modified toughening agent has a multi-sea-island-knot series structure, and compared with unmodified MBS, the modified toughening agent is added into a PC / PET alloy system, so that the forming capacity and toughness of the PC / PET alloy material can be improved, and the service life of the PC / PET alloy material is prolonged. Adverse effects of addition of the flexibilizer on tensile strength, flexural modulus and thermal stability of the PC / PET alloy material are avoided, and even the tensile strength, flexural modulus and dimensional stability of the PC / PET alloy material are improved.

To provide a tubular body which is a fiber-reinforced composite material using reinforcing fibers and a matrix resin, is lightweight and has excellent static bending strength, and to provide a golf club shaft and a fishing rod using the same.SOLUTION: A method for manufacturing a fiber-reinforced composite tubular body obtained by laminating a plurality of prepregs containing reinforcing fibers and an epoxy resin composition and curing the laminated prepregs, wherein the plurality of laminated prepregs have a difference in tensile modulus of the reinforcing fibers contained therein of at most 10% and an average value of flexural moduli of the epoxy resin compositions contained therein as cured products thereof of 4.0 GPa or more.SELECTED DRAWING: None

The application relates to a high-rigidity PC alloy material and a preparation method and application thereof, and the PC alloy material comprises the following components and weight contents: 40-80 parts of PC resin, 10-20 parts of high-temperature nylon, 10-40 parts of short-cut carbon fiber, 2-6 parts of a compatilizer, and 0.1-1 part of other additives. The preparation method is that the components are uniformly stirred in a mixing barrel, and are added into a double screw through a main feeding port; the short-cut carbon fiber is added into an extruder through a side feeding port, is extruded and granulated through the extruder, and the high-rigidity PC alloy material is obtained. Compared with the prior art, the application can greatly improve the bending modulus of the material, improves the reinforcing effect of the short-cut carbon fiber, thereby improving the rigidity of the material, and plays a role of replacing steel with plastic.

A securing device (50) comprising a base (52) and a plurality of securing elements (54), the securing device (50) comprising a first thermoplastic material having a flexural modulus of between 200 MPa and 4500 MPa and a second material selected from the group of materials: a second thermoplastic material having a flexural modulus that differs from the flexural modulus of the first thermoplastic material by at least 10% and / or at least 100 MPa; the mass ratio of the non-thermoplastic material in the total composition of the fixing device is strictly greater than 1%; the mass ratio of the mineral filler and / or the plant filler in the total composition of the fixing device is less than or equal to 30%; or a combination of the materials.

A structure having a tunable modulus of bending (flexibility) composed of interlocking geometric particles arranged such that an external pressure / force causes them to jam together, increasing the stiffness of the overall structure. Methods for creating the external pressure can include the use of an envelope around the structure that can be evacuated of air.

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.