40 results about "Bulk moulding compound" patented technology

A composite bipolar plate of polymer electrolyte membrane fuel cells (PEMFC) is prepared as follows: a) preparing a bulk molding compound (BMC) material containing a vinyl ester resin and a graphite powder, the graphite powder content of BMC material ranging from 60 wt % to 80 wt %, based on the compounded mixture; b) molding the BMC material from step a) to form a bipolar plate having a desired shape at 80-200° C. and 500-4000 psi, wherein the graphite powder is of 40 mesh-80 mesh.

A sizing composition that permits in-line chopping and drying of reinforcement fibers for reinforcing thermoset resins is provided. The size composition includes at least one coupling agent and one or more blocked polyurethane film forming agents. The blocking agent preferably de-blocks at a temperature that permits simultaneous or nearly simultaneous de-blocking and curing of the polyurethane film former. The sized fiber strands may be chopped to form chopped strand segments and dried in a fluidized bed oven, such as a Cratec® drying oven, in-line. The chopped fiber strands may then be used in a bulk molding compound and molded into a reinforced composite article. Chopping the glass fibers in-line lowers the manufacturing costs for products produced from the sized fiber bundles. Further, because the reinforcement fibers can be chopped and dried at a much faster rate with the inventive size composition compared to conventional off-line chopping processes, productivity is increased.

The invention provides a carbon fiber and glass fiber hybrid-reinforced sheet moulding compound and is characterized in that the sheet moulding compound mainly comprises resin paste I, resin paste II and thickening agent; the manufacturing technology of the sheet moulding compound comprises the following steps: the preparation of the resin paste I, the resin paste II and the thickening agent; the mixing of the resin paste I and the thickening agent and that of the resin paste II and the thickening agent; and impregnation: the resin paste I and chopped carbon fiber, and the resin paste II and chopped glass fiber are impregnated on an SMC (Sheet Molding Compound) machine set respectively, the impregnated chopped glass fiber is uniformly placed on the impregnated chopped carbon fiber, and then the impregnated chopped glass fiber and the impregnated chopped carbon fiber are composited by pressure through a compacting machine to manufacture a carbon fiber and glass fiber hybrid sheet material which is wound or packaged in a box through the compacting machine and then is subject to slaking treatment; and after the slaking treatment, the carbon fiber and glass fiber hybrid sheet material is made into a finished sheet moulding compound product through mould pressing. The sheet moulding compound has a low cost and a low manufacturing cost, can meet requirements for utilization, is suitable for industrial production and is simple and applicable.

Formulations comprising an isosorbide-modified unsaturated polyester comprising maleic acid, fumaric acid, itaconic acid or maleic anhydride and isosorbide and one or more low profile additives. The formulations exhibit better shrink control in molding compound formulations with standard low profile additives than their non-isosorbide-modified analogues. These isosorbide-modified unsaturated polyester resins may be applied in molding compounds like sheet molding compounds or bulk molding compounds and may be components of fiber reinforced composites or other composite materials.

A hollow golf club head includes a face portion, a sole portion, a side portion, a crown portion, and a hozel portion. A main portion of the crown portion is made of a fiber reinforced resin. The fiber reinforced resin portion includes a bulk molding compound (BMC) molded body. At least the face portion, a leading edge of the crown portion continuous with the face portion, and a center portion of the sole portion in a toe-heel direction are made of a metal. Alternatively to this configuration, the face portion may be provided with a metal faceplate, a portion subsequent to the face portion may include a BMC molded body, and a rear portion of the crown portion may include a molded laminate of prepreg sheets. The height of center of gravity may be 24 mm or less.

The invention discloses a BMC (Bulk Moulding Compound) material with weather resistance. The BMC material is prepared from the following main raw materials in percent by weight in the terms of the weight of the BMC material: 16-26 percent of weather-resisting unsaturated polyester resin, 4-10 percent of low-shrinkage additive, 30-60 percent of filler calcium sulfate, 10-20 percent of filler calcium silicate, 0.1-1 percent of curing agent, 0.8-2 percent of releasing agent, 0.2-0.4 percent of thickening agent, 0.1-0.5 percent of antioxidant, 0.5-1.0 percent of assistant, 2-4 percent of weather-resisting pigment, 0.1-0.5 percent of ultraviolet absorber and 12-25 percent of glass fiber, wherein the sum of the percents by weight of all raw materials of the BMC is 100 percent. The BMC material has excellent acid and alkali resistance, ultraviolet light oxidation resistance, hydrolysis resistance, high-low temperature resistance, and weather resistance.

A substrate for counter electrode of dye-sensitized solar cell is made of a composite material, which is prepared by: a) compounding vinyl ester and graphite powder to form bulk molding compound (BMC) material, the graphite powder content ranging from 60 wt % to 95 wt % based on the total weight of the graphite powder and vinyl ester, wherein 0.01-10 wt % of an electrically conductive filler, based on the weight of the vinyl ester resin, is optionally added during the compounding; b) molding the BMC material from step a) to form a substrate for the counter electrode having a desired shaped at 80-200° C. and 500-4000 psi.

The invention belongs to the technical field of fuel cells, and particularly relates to a graphite-based composite bipolar plate for a fuel cell and a preparation method of the graphite-based composite bipolar plate. The preparation method of the graphite-based composite bipolar plate comprises the following steps: (a) mixing prepared thermosetting resin slurry and graphite powder to form a blocky molding compound, and adding modified carbon nanotubes accounting for 0.1%-10% of the total weight of the graphite powder and the thermosetting resin slurry in the mixing process; and (b) carrying out mold pressing on the blocky molding compound obtained in the step (a) at 50-300 DEG C and 5-35 MPa for 0.5-5 min to obtain the graphite-based composite bipolar plate for the fuel cell. The carboxylation reaction modified carbon nanotubes are used in the preparation of the graphite-based composite bipolar plate, and the prepared graphite-based composite bipolar plate has the advantages of high conductivity, high corrosion resistance, excellent mechanical properties, ultra-thin thickness, excellent dimensional stability, high thermal stability and the like; and the volume power density and the safety of the fuel cell can be improved.

Thermally curate resin composition, having shrink-controlled properties and being suitable for use in sheet moulding compounds and bulk moulding compounds (SMCs and BMCs) comprising, inter alia (a) an unsaturated polyester; (b) an alkenyl aromatic monomer; (c) a low profile additive; (d) a peroxide initiator; (e) a thickening agent; (f) fibrous reinforcement material; and optionally one or more components selected from the group of (g) mould release agents; (h) wetting and viscosity reducing agents; and (i) fillers, wherein the composition also comprises a uret dione diisocyanate, in an amount of at least 0.2-1.0% by weight relative to the total weight of components (a), (b) and (c) of the resin composition. The resin compositions according to the invention in particular have a low emission of volatile organic compounds (VOC). More particularly, the resin compositions have excellent Class A properties. The present invention also relates to low profile additives (LPAs) wherein a uret dione diisocyanate is chemically attached through one or both of its reactive side-chain isocyanate groups to one or more of the OH—, NH₂—, or COOH— groups of a component already having LPA properties. Finally, the present invention relates to low-VOC products and parts produced from the SMCs and BMCs according to the invention.

A vehicle front end load bearing bolster is provided with improved structural performance and a lower component weight, while also minimizing material, tooling, and production costs. The front end assembly is formed with a hydro-formed cross car reinforcement tube secured or bonded with mechanical fasteners and room temperature adhesive to a bolster, thereby improving stress distribution and increasing cross car system stiffness. The bonded hydro-form tube/bolster assembly provides increased torsion stiffness and dimensional stability to the vehicle frame. The hydro-formed cross car reinforcement tube have flattened terminal ends with apertures for integrated attachment to a bolster. The hydro-formed cross car reinforcement tube is formed of aluminum, brass, carbon, steel, stainless steel, copper and high strength alloys. The bolster is formed of high strength plastics and composites including sheet molding compounds (SMC), bulk molding compounds (BMC), and thermoplastic compounds such as glass mat thermoplastic (GMT) and direct long fiber thermoplastic (DLFT).

This invention provides a baffle formed from a thermoset composite material such as Bulk Molding Compound (BMC), Thick Molding Compound (TMC), or Sheet Molding Compound (SMC). Due to the physical properties of BMCs, TMCs, and SMCs, the baffle may be molded to minimize the propagation of vibrational energy and resonant mode behavior while providing high strength and rigidity. The baffle may also be formed so transducer mounts, ports and wave-guides may be molded into the baffle shape.

A bowl includes a body portion. The body portion is formed from a material comprising a bulk molding compound. The bulk molding compound includes a polyester resin, glass fiber and calcium carbonate. A method for forming a bowl includes providing a composition comprising a bulk molding compound, providing the composition in a cavity of a mold including a male die member and a female die member, and compressing the male die member and the female die member under heat to form a molded material. The bulk molding compound includes a polyester resin, glass fiber and calcium carbonate.

The invention provides a UV-resistant bulk moulding compound (BMC) material used outdoors. The material comprises resin, aluminum hydroxide, calcium carbonate, a curing agent, glass fibers and an anti-UV agent, wherein the resin is unsaturated resin and low-shrinkage resin, and the anti-UV agent is a benzoic acid anti-UV agent or a benzotriazole anti-UV agent. The invention also provides a preparation method of the ultraviolet-resistant BMC material used outdoors. According to the method provided by the invention, after analysis comparison and screening tests of current anti-UV agents, the benzoic acid or benzotriazole anti-UV agent is added into a current common BMC material, so that the BMC material has good compatibility with the unsaturated resin and can be colored, and the propertiesand forming of the material are not affected; and the product has a high-efficiency light stability effect, and the characteristics of no toxicity, non-flammable performance, non-explosive performance, corrosion resistance and good storage performance.

An attachment interface is provided for connecting a vehicle composite component having a plate portion that is made of a fiber reinforced polymer and has a passage extending in a through manner along an axis. The attachment interface provides a metal attachment device, which includes an inner portion engaging the passage and an outer portion defining a connection point suitable to be connected to another vehicle element. The plate portion is axially sandwiched between two layers made of a fiber reinforced polymer composite material selected from the group consisting of BMC (Bulk Molding Compound), LFT (Long Fiber Thermoplastic) and DLFT (Direct Long Fiber Thermoplastic).

A lamp reflector having a substrate prepared by injection molding a bulk molding compound (BMC). The BMC has a matrix resin mainly including: an unsaturated polyester resin and glass fiber as a reinforcing inorganic filler, and hollow glass spheres in an amount of 10 to 40% by volume based on the BMC as an additional inorganic filler.