345 results about "Sheet moulding compound" patented technology

This invention provides a method of producing a highly electrically conductive sheet molding compound (SMC) composition and a fuel cell flow field plate or bipolar plate made from such a composition. The plate exhibits a conductivity typically greater than 100 S/cm and more typically greater than 200 S/cm. In one preferred embodiment, the method comprises: (a) providing a continuous sheet of a substrate material (bottom sheet) and a continuous sheet of flexible graphite (top sheet) from respective rollers; (b) feeding a resin mixture (comprising a thermoset resin and a conductive filler) to a space between the top sheet and the bottom sheet in such a way that the resin mixture forms a uniform core layer sandwiched between the two sheets to obtain a laminated structure; (c) compressing the laminated structure to obtain a SMC composition having two opposite outer surfaces; and (e) impressing a fluid flow channel to either or both of the outer surfaces (e.g., via embossing or matched-die molding) and curing the thermoset resin to obtain the plate.

The invention discloses a heat-resisting phenolic moulding compound belonging to the technical field of thermoset moulding compound. The heat-resisting phenolic moulding compound is composed of the following raw materials in parts by weight: 25-40 parts of phenolic resin, 2-10 parts of thermosetting resin, 3-8 parts of curing agent, 1-3 parts of accelerator, 15-40 parts of reinforcing fibre, 0.5-2 parts of interface modifier, 0.5-2.5 parts of releasing agent and 10-40 parts of inorganic filler. Because in the technical scheme of the invention, raw material selection is reasonable and the use amount of each raw material is proper, the invention can ensure that the eat-resisting phenolic moulding compound has excellent curing system and the flame retardant property reaches V-0 level. The heat-resisting phenolic moulding compound is suitable for manufacturing handles, handle knobs and the like of daily necessities, such as cookers and the like, can satisfy strict requirements on product heat resistance by electronic parts, electrical appliance parts, mechanical parts, automobile parts and the like, improves the adaptability of the moulding process, and can be moulded by injection and mould pressing.

A temperature regulation and management system is provide that has an inner wall and an outer wall forming a space for accommodating a phase change material (PCM) with the space between the walls, in one or both of the walls, or a combination of such locations. The inner wall is in contact with an object that requires temperature regulation within a specified operating range, such as a vehicle battery pack. The inner wall and the outer wall are both formed from sheet molding compound (SMC), or the outer wall if formed of a filled polyurethane.

A novel material comprising collections of prepreg plies and a variable thickness core material such as sheet molding compound or metal, methods of forming said material, and golf clubs comprising said material are disclosed herein. Golf club heads having faces made of multiple materials, including a composite layer at least partially sandwiched between two metal layers, are also disclosed herein.

A flow-guiding member unit used for assembling a flow-guiding member comprising pluralities of vanes, an outer platform and an inner platform, the unit comprising an integral body member comprising one vane portion, an outer platform portion, and an inner platform portion, a first elastic member attached to a step of the outer platform portion, and a second elastic member attached to a step of the inner platform portion, the body member being formed by the thermal compression of sheet-molding compounds or fiber-reinforced resin pellets, and the first and second elastic members being made of a thermoplastic elastomer.

A speaker enclosure having a substantially seamless rigid outer skin, a middle sound absorbing layer, and a substantially seamless inner skin results in a lightweight speaker having sound absorbing characteristics. The speaker enclosure is comprised of two basic parts, a box section and a baffle section where each of these sections include a rigid outer skin, the middle sound absorbing layer and a seamless inner skin and are made according to the same method. The outer skin is formed from a layer of sheet molding compound, the middle sound absorbing layer includes pieces of honeycomb material, and the inner skin is formed from a layer of sheet molding compound. The layers of material are placed into a mold and then cured through vacuum bagging and heating thereby producing a strong, lightweight speaker enclosure made of materials which attenuate the transmission and retransmission of errant sound waves in the enclosure thereby reducing distortion of the sound signal produced by the speaker.

A pallet made of sheet molding compound (SMC) preferably includes a lower deck having unidirectional fibers therein and an upper deck having randomly oriented fibers therein. The upper and lower decks are assembled by heat staking the decks together with thermoplastic blocks.

This invention provides an electrically conductive, less anisotropic, recompressed exfoliated graphite article comprising a mixture of (a) expanded or exfoliated graphite flakes; and (b) particles of non-expandable graphite or carbon, wherein the non-expandable graphite or carbon particles are in the amount of between about 3% and about 70% by weight based on the total weight of the particles and the expanded graphite flakes combined; wherein the mixture is compressed to form the article having an apparent bulk density of from about 0.1 g/cm³ to about 2.0 g/cm³. The article exhibits a thickness-direction conductivity typically greater than 50 S/cm, more typically greater than 100 S/cm, and most typically greater than 200 S/cm. The article, when used in a thin foil or sheet form, can be a useful component in a sheet molding compound plate used as a fuel cell separator or flow field plate. The article may also be used as a current collector for a battery, supercapacitor, or any other electrochemical cell.

The invention discloses a high heat-resistant fiber reinforcement vinyl ester composite material with a low expansion coefficient, comprising the following ingredients by weight percentage: 10-40 of vinylite, 15-25 of glass fiber, 10-60 of carbon fiber powder, 5-25 of low profile additive, 10-70 of inorganic mineral filler, 1-4 of magnesium oxide, 1-5 of releasing agent, and 0.5-2 of curing agents. The composite material has good mechanical performance, high heat resistance and the low expansion coefficient. The composite material product prepared by the material is a sheet molding compound (SMC), the adopted molding process is compression molding forming or injection molding, and can be widely applied to a precise part under a high-heat working environment.

The invention discloses an SMC (sheet molding compound) material for passenger car covering parts and a preparation method thereof. The SMC material comprises 60-100 parts of base resin, 80-200 parts of reinforcing fiber, 30-50 parts of low shrinkage agent, 130-220 parts of inorganic mineral filler, 20-60 parts of hollow glass microsphere, 3-8 parts of releasing agent, 1-4 parts of curing agent and 1-5 parts of thickening agent. The hollow glass microspheres, of which the average particle size is less than 40 micrometers and the compression strength is greater than 37MPa, are utilized to lower the density of the material; the novel liquid releasing agent is used instead of the traditional releasing agent, so that the product surface can be directly painted without treatment; and PVAc/St copolymer and saturated polyester are utilized to compound the low shrinkage system, so that the material has zero shrinkage and satisfies the requirements for Grade A surfaces. The invention has the advantages of low specific gravity, no need of surface treatment and Grade A surface, and can be used for passenger car covering parts instead of steel materials.

The invention relates to a formula and a preparation method of a novel low-shrinkage amino moulding compound. The novel low-shrinkage amino moulding compound comprises urea, formaldehyde, melamine, lubricant, dispersant, release agent, a curing agent system, dye, filler, cellulose and low shrinkage agent. The invention is characterized in that (1) the low shrinkage agent is water-soluble isocyanate elastomer; (2) the low shrinkage agent can be uniformly dispersed in a resin system and improve the surface glossiness of the moulding compound without influencing the coloring property of the dye or other performances of the moulding compound; and (3) a relatively small amount of the low shrinkage agent can meet the shrinkage requirement of the moulding compound. The preparation method of the moulding compound comprises the following steps: proportionally mixing and uniformly stirring the urea, the formaldehyde and the curing agent to prepare resin raw pulp; then transferring the raw pulp into a reaction kettle and adding the low shrinkage agent and other auxiliaries; and performing vacuum kneading and polymerization to prepare the amino moulding compound, wherein the forming shrinkage of the amino moulding compound is less than 0.6%, and the post shrinkage is less than 0.4%.

The invention relates to a bathroom chassis which is produced by a sheet molding compound (SMC), the sheet molding compound comprises resin paste and glass fiber which is fully impregnated in the resin paste, wherein the resin paste accounts for 75%-85% (by weight), and the glass fiber accounts for 20%-25% (by weight). Compared with the existing bathroom chassis, the closed molding of the bathroom chassis is carried out under high temperature and high pressure, thereby completely curing the product to the maximum extent, leading the organic monomer residue to be lower, being more environment-friendly and healthy and being applicable to home decoration.

An automatic film tearing cutting machine for SMC (sheet molding compounds) comprises a film tearing and sheet feeding device, a cutting device and a sheet picking device. The film tearing and sheet feeding device comprises an upper film tearing rotary drum, a lower film tearing rotary drum, a main sheet feeding rotary drum and a driven sheet feeding rotary drum, the upper film tearing rotary drum and the lower film tearing rotary drum are respectively matched with an upper film and a lower film, the main sheet feeding rotary drum and the driven sheet feeding rotary drum are matched with a middle core, and the various rotary drums are driven by a servo motor via a transmission mechanism; the cutting device comprises a cutting support, a lead screw, a sliding rod and a slider are mounted in the cutting support, the lead screw is driven by a second servo motor, and a blade is connected to the lower side of the slider and is driven to rotate by a third motor; and the sheet tanking device comprises a sheet picking framework, more than two sheet picking rotary drums are mounted in the sheet picking framework, are matched with a cut core, and are mutually driven by a motor via a transmission chain, and sheet picking plates are arranged below the sheet picking rotary drums and are driven by a picking sliding mechanism to pick out a cut and molded core.

The invention relates to a high-fluidity flame-retardant sheet-shaped molding compound and a preparation method thereof and belongs to the field of chemical engineering raw materials. A formula of the molding compound comprises, by mass parts, 15-30 parts of unsaturated polyester, 10-40 parts of glass fiber, 5-15 parts of low shrinkage agent, 30-60 parts of flame-retardant fillers, 0.2-1 part of initiator, 0.02-0.1 part of inhibitor, 0.2-1 part of thickener, 2-10 parts of styrene, 1-5 parts of internal releasing agent and 0.1-0.5 part of viscosity reduction addition agent. According to the high-fluidity flame-retardant sheet-shaped molding compound and the preparation method thereof, the high impact strength low shrinkage agent is adopted to make up for a loss of mechanical properties caused by adding of the flame-retardant fillers, the flame-retardant fillers of different diameters are utilized to play a synthetic synergic filling effect, so as to improve a flame retardant effect; and the resin paste viscosity is reduced through the viscosity reduction addition agent, so that the high-fluidity flame-retardant sheet-shaped molding compound is formed. The method for preparing the high-fluidity flame-retardant sheet-shaped molding compound is provided.

A composite part made from a sheet molding compound is disclosed as having improved characteristics over traditional sheet molding compound composite parts. The fibrous material is introduced as a veil layer adjacent a paste layer, the veil flows well during the molding process. The improved flow and surface characteristics of a composite part are attributed to the elongation of the veil during molding and to the improved filling capabilities.

The invention discloses a carbon fibre-reinforced flaky moulding material for shielding electromagnetic waves as well as a preparation method and application. The flaky moulding material contains the following components according to parts by weight: 60 to 100 of matrix resin, 30 to 100 of carbon fibre, 30 to 50 of low shrinking agent, 2 to 10 of wave absorbing agent, 130 to 230 of inorganic mineral filler, 1 to 4 of curing agent, 1 to 5 of thickening agent and 2 to 10 of other components; and the carbon fibre is carbon fibre which is not treated by graphitization, and acts as the function of absorbing electromagnetic waves in the compound material. The flaky moulding material has excellent electromagnetic wave shielding performance and mechanical performance and can be used for the fields of electronic equipment, traffic, military affairs and the like. The carbon fibre-reinforced flaky moulding material for shielding the electromagnetic waves is used as materials, such as a wave absorbing material, a battery case of an electric automobile with a novel energy resource, and an invisible material.