28 results about "Flexural modulus" patented technology

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.

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).

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.

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 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.

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

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.

This utility model relates to the technical field of bending modulus testers, and discloses an auxiliary alignment structure and a bending modulus testing device for sheet metal. The device includes a mounting base with a groove inside. Sliding blocks are slidably connected to both ends of the groove. A bidirectional lead screw is rotatably connected to the middle of the mounting base. The threaded grooves at both ends of the bidirectional lead screw are in opposite directions. The two ends of the bidirectional lead screw are threadedly connected to two sliding blocks respectively. A support is fixed to the top of each sliding block, and a collecting block is slidably connected to the outside of the support. Because the sliding blocks fixed to the bottom of the two supports are threadedly connected to the bidirectional lead screw, and the threaded grooves at both ends of the bidirectional lead screw are in opposite directions, the two supports move synchronously, ensuring that the pressure head is always in the middle position between the two supports. This makes adjusting the supports simpler, more convenient, and easier to operate.

A holding device (50) comprising a base (52) and a plurality of holding elements (54), wherein the holding device (50) includes a first thermoplastic material having a flexural modulus of 200 to 4500 MPa and a second material. The second material is selected from the group consisting of a second thermoplastic material whose flexural modulus differs from that of the first thermoplastic material by at least 10% and / or at least 100 MPa, a non-thermoplastic material present in a content strictly greater than 1 mass% of the total composition of the holding device, a mineral filler and / or plant filler whose content is 30 mass% or less of the total composition of the holding device, and combinations thereof.

This invention provides a cutting component that exhibits excellent machinability and suppresses burr formation during machining operations such as cutting, slicing, or drilling using mechanical tools. The cutting component is a molded body comprising a resin composition containing a thermoplastic resin (A) and a reinforcing material (B), wherein the thermoplastic resin (A) is an amorphous thermoplastic resin, and the reinforcing material (B) is an inorganic reinforcing material with a Mohs hardness of 5 or less. The cutting parameter of the cutting component, defined by the following formula (1) based on the breaking toughness K1c and flexural modulus, is 15m. 1／2 ~100m 1／2 Machinability parameter = (Failure toughness K1c / Flexural modulus) × 10 5 ・・・Form (1)

The invention discloses a method and a system for measuring the II-type layered crack length and fracture toughness of a composite material, belongs to the field of mechanical property testing of composite materials, and aims to solve the problems that the conventional ENF test depends on optical equipment, neglects a damage mechanism and is insufficient in precision due to lack of correction capability. The method comprises the following steps: preparing an ENF test piece and recording initial parameters; the universal testing machine and the acoustic emission equipment synchronously acquire load-displacement data and acoustic emission signals; defining an initial parameter based on a peak load, calculating a bending modulus, and obtaining initial / steady-state fracture toughness and an equivalent fracture area length by combining a flexibility beam theory and piecewise fitting; classifying damage events by using a clustering algorithm, quantifying an energy slope, and calculating an initial-steady-state toughness ratio; and iteratively correcting and optimizing the initial fracture toughness and the initial parameter until the error reaches the standard, and outputting a multi-dimensional parameter. The method does not need optical observation, quantifies the damage contribution, improves the measurement precision through iterative correction, provides reliable data support for the safety evaluation of the composite material structure, and is high in practicability.

An unnucleated metallocene polypropylene having: (i) a melting temperature of from about 153 °C (307 °F) to about 183°C (361.4 °F); (i) a heat deflection temperature of from about 98.9°C (210°F) to about 129.4 °F (265°F); (iii) a lower temperature bound for the isothermal crystallization temperature of from about 120 °C (248°F) to about 154°C (309.2°F); (iv) a flexural modulus of from about 200 kpsi to about 330 kpsi; and (v) a tensile modulus of from about 220 kpsi to about 325 kpsi; and (vi) a tensile strength at yield of from about 4800 psi to about 5900 psi.

The seal ring comprises a first ring having an inner circumferential surface and an outer tapered surface inclined with respect to the inner circumferential surface, and a second ring having an outer circumferential surface and an inner tapered surface inclined with respect to the outer circumferential surface and facing the outer tapered surface. Of the first ring and the second ring, one is formed of a first resin with a flexural modulus of less than 700 MPa, and the other is formed of a second resin with a flexural modulus of 700 MPa or more. When the first ring is formed of the first resin, the seal ring seals the 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 the fluid on the inner circumferential surface side of the first ring.

The invention discloses an anti-warping metal spraying-free PC / ABS (Polycarbonate / Acrylonitrile Butadiene Styrene) alloy material and a preparation method thereof. According to the PC / ABS alloy material disclosed by the invention, the PC with high and low melt index is compounded in the components of the PC / ABS alloy material, so that the buckling deformation of the material is reduced, the excellent bending modulus and impact strength of the material are kept, and the rigidity, dimensional stability and processability of the material are remarkably improved; moreover, by adopting the specific talcum powder subjected to surface treatment by the silane coupling agent, the flexibilizer and the lubricant, the rigidity, the dimensional stability and the surface glossiness of the alloy material are further improved, and meanwhile, the spot defect of metal appearance is avoided. In addition, the vacuum degree in the alloy material machining process is optimized, small molecule volatile matter is removed, and the color difference after aging is reduced. The PC / ABS alloy material prepared by the invention not only has a good appearance effect of imitating metal spraying, but also has excellent rigidity, dimensional stability, surface glossiness, flame retardance and ageing resistance.

The invention discloses a semi-analytical method and DCB test super-hybrid composite material I-type layering behavior characterization method, and particularly relates to the technical field of composite material mechanics. The method comprises the following steps: firstly, carrying out mechanical analysis on a double-cantilever beam sample by utilizing a Timoshenko beam theory, and deducing an analytical expression of a displacement field, flexibility and total fracture toughness; and reversely and synchronously identifying the bending modulus Ef and the shear modulus G13 of the material through flexibility measurement values under different crack lengths. According to the method, J integration irrelevant to an integration path is introduced, an index type bridging stress function is combined, contribution of fracture toughness of a crack tip and a fiber bridging area is clearly separated, and accurate energy analysis of the whole layered expansion process is achieved. According to verification of CFRP / TC4 and GFRP / TC4 super-hybrid composite material systems, results show that the method can efficiently and accurately obtain the I-type interlayer fracture toughness R curve and the bridging stress.

The present invention relates to a cardiac lead body having optimized torque (torsion) transmission properties by virtue of a choice of one or more materials having a specific combination of hardness and flexural modulus. The invention also relates to the lead comprising such a lead body, and to the use of a polymer material having a specific hardness and flexural modulus for the manufacture of a structural element of an implantable cardiac lead body. The implantable cardiac lead body (1) has a proximal end, a distal end and an outer transverse diameter less than or equal to 2.5 mm, preferably less than 1.7 mm, the lead body comprising predominantly by weight at least one polymer material as a structural matrix (2), the at least one polymer material having a Shore hardness of between 75A and 65D, preferably between 85A and 60D, as measured according to ASTM D2240 or ISO 48-4, and a flexural modulus of between 1300 and 26000 psi, preferably between 10000 and 20000 psi.