33results about How to "Does not affect dielectric properties" patented technology

The present invention discloses a thermosetting resin composition, which comprises (calculated as the solid weight): (a) 10-80 parts of a hydrocarbon resin, (b) 20-100 parts of maleimide ester, (c) 0.1-8 parts of an initiator, and (d) 5-100 parts of an epoxy resin. According to the present invention, the maleimide ester having the polyfunctional long-chain structure and the rigid imide ring is used and is matched with the hydrocarbon resin having the flexibility to form the thermosetting composition, such that the thermosetting resin composition and the prepared printed circuit prepreg and laminated plate produced by using thermosetting resin composition have characteristics of excellent dielectric property, excellent heat resistance, excellent adhesion, excellent flame retardancy, excellent flexural strength, excellent toughness, high peel strength, low water absorption, excellent processability and the like through the interaction between the hydrocarbon resin and the maleimide ester.

The invention relates to a modified polybutadiene prepolymer as well as a preparation method and application thereof, resin composition prepared from the modified polybutadiene prepolymer, a prepreg prepared from the resin composition, a metal foil coated laminated board and a layer insulation film. The modified polybutadiene prepolymer is a prepolymer of an epoxy polybutadiene mixture, bismaleimide resin and cyanate ester in the weight ratio being 100: (10-60): (15-80). The problem that polybutadiene is incompatible with other resin is solved, the adhesion performance of a hydrocarbon resin system is improved, the peel strength between copper foil of the laminated board and the resin layer is improved, and the dielectric performance of the resin system is not affected. The brittleness of a maleimide cured product is improved by the aid of epoxy polybutadiene resin, polybutadiene and silica-containing butadiene.

The present invention discloses a thermosetting resin composition. The composition comprises the following components, in parts by weight: (a) 100 parts of epoxy resin; (b) 50-200 parts of unsaturatedpolyester active ester resin; (c) 10-200 parts of vinyl benzyl modified phenolic resin; and (d) 0.05-4 parts of an accelerant. According to the composition provided by the invention, the unsaturatedpolyester active ester resin can effectively combine an active ester curing epoxy resin system, a hydrocarbon resin curing system and a vinyl benzyl modified phenolic resin system through chemical bonding, the excellent properties of the active ester curing epoxy system, the excellent properties of the hydrocarbon resin and the excellent properties of the vinyl benzyl modified phenolic resin system are combined effectively, so that the resin composition has excellent dielectric properties, heat resistance, strength, stiffness flexibility, high peeling strength, a low water absorption ratio anda low heat shrinkage ratio after being cured, and can be applied to high-speed high-frequency printed circuit boards.

The invention provides a low-temperature co-fired ceramic material emitting white light and a preparation method thereof. The ceramic material comprises the following components in percentage by mol: 10 to 20 percent of CaO, 20 to 30 percent of B2O3, 50 to 60 percent of SiO2, and 1 to 9 percent of optical activating agent ions. The invention also relates to the preparation method of the material, namely, a sol-gel method for preparing the low-temperature co-fired ceramic material emitting white light. The invention has the advantages that: 1, the preparation process is simple and advanced, the sintering temperature is low by adopting the Sol-gel method and is between 800 DEG C and 900 DEG C, the sintering shrink rate at the temperature is controllable between 13 percent and 17 percent, and a glass ceramic material has a flat and smooth surface, as well as higher strength; 2, the dielectric constant is adjustable between 4(1MHz) and 6 (1MHz), and the coefficient of dielectric loss is lower than 0.002; 3, the light emission intensity is high, the material can emit yellow and blue light under activation of ultraviolet light with the wavelength of between 320nm and 410nm, the white light obtained by mixing the blue light and the yellow light can be used for illuminating and displaying; and 4, based on the advantages, the low-temperature co-fired ceramic material can be applied to the fields of white light LED (Light Emitting Diode) lamps, integrated ceramic substrates and other electronic devices and semiconductors, as well as microelectronic packaging materials.

The invention discloses a thermosetting resin composition. The thermosetting resin composition is prepared from, by solid weight: (a) 10-80 parts of hydrocarbon resin; (b) 100 parts of phosphoric maleimide; (c) 0.1-8 parts of initiator; (d) 5-100 parts of epoxy resin. he thermosetting resin composition applies the maleimide with multi-functional long-chain structure and rigid imide ring and combines with a flexible hydrocarbon resin to form a thermosetting composition through the interaction, and finally makes the thermosetting resin composition and prepregs and laminates produced by using the same for the printed circuit have the characteristics of excellent dielectrical property, heat resistance, adhesion, flame resistance, bending strength, toughness, high peel strength, low water absorption, excellent processing performance and others.

The invention discloses a thermosetting resin composition which is prepared from the following components in parts by weight: (a) 100 parts of epoxy resin, (b) 50-200 parts of unsaturated polyester active ester resin, (c) 10-200 parts of vinyl modified polyphenyl ether ester, and (d) 0.05-4 parts of an accelerant. The unsaturated polyester active ester resin can combine an active ester cured epoxyresin system, a hydrocarbon resin curing system and a polyphenyl ether system effectively by means of chemical bonds and combine excellent performance of the active ester cured epoxy resin system, the hydrocarbon resin curing system and the polyphenyl ether system effectively, so that the resin composition which is cured has excellent dielectric property, heat resistance, strength, stiffness andflexibility, high peel strength, low water absorption and small heat shrinkage, and can be applied to high speed and high frequency printed circuit boards.

The invention discloses a thermosetting resin composition. The thermosetting resin composition is prepared from, by solid weight: (a) 10-100 parts of hydrocarbon resin; (b) 20-100 parts of maleimide; (c) 0.1-8 parts of initiator; (d) 10-100 parts of cyanate ester resin. The thermosetting resin composition applies the maleimide with multi-functional long-chain structure and rigid imide ring and combines with a flexible hydrocarbon resin to form a thermosetting composition through the interaction, and finally makes the thermosetting resin composition and prepregs and laminates produced by using the same for the printed circuit have the characteristics of excellent dielectrical property, heat resistance, adhesion, flame resistance, bending strength, toughness, high peel strength, low water absorption, excellent processing performance and others.

The invention relates to a BN (Boron nitride) coating modified SiO2f/SiO2 composite material for a radar dome and an antenna window and a preparation method thereof. The method comprises the followingsteps: surface pre-treatment, preparation of a BN coating precursor, dipping of a BN coating, thermal treatment of the BN coating, dipping of preforms, sintering of preforms, density measurement andmaterial grinding. The preparation process disclosed by the invention is simple, a period is short, the density of a material can reach 1.8g/cm<3>, the bending strength can reach 120MPa, a dielectricconstant is less than or equal to 3, dielectric loss under frequency of 2GPa to 18GPa is not more than 0.02, the working can be continuously carried out for 10 minutes at a high temperature of 800 DEGC, and an instantaneous working temperature can reach 1200 DEG C. The BN-modified SiO2f/SiO2 composite material and the preparation method disclosed by the invention have the advantages that the moisture absorption prevention ability is good, the problem that the characteristics including easiness for crystallization, low densification degree and mechanical strength of an existing SiO2f/SiO2 composite material cannot meet a use requirement is solved, and the density and mechanical performance of the material are improved.

The invention discloses a silicon dioxide aerogel based composite shielding layer material and a preparation method thereof. The preparation method comprises the following steps: soaking organic polyurethane foams into silicon dioxide ceramic slurry, performing vacuum soaking, taking out foams with the silicon dioxide ceramic slurry, uniformly extruding, drying, sintering, soaking into sol, adjusting the pH value, performing gelatination on the sol inside silicon dioxide foamed ceramic for 10 minutes to 3 hours, performing solvent exchange in absolute ethyl alcohol, and performing supercritical drying, thereby obtaining the silicon dioxide aerogel based composite shielding layer material. The composite shielding layer material is a high-strength light electromagnetic shielding material ofa micro-nano composite porous structure. Due to strong dense pore ribs in the silicon dioxide foamed ceramic, a good support property is achieved, the nano pore silicon dioxide aerogel among pore ribsis excellent in dielectric property of electromagnetic shielding, and the material has relatively good support strength for cores, is small in brittleness, is not liable to crack in the preparation process and is relatively good in dielectric property.

The invention relates to a cover plate of an induction identification module, and a preparation method and an application thereof. The preparation method of the cover plate of the induction identification module comprises the following steps: press forming zirconia ceramic powder to obtain a blank; sintering the blank to obtain a zirconia ceramic body; cutting the zirconia ceramic body into pieces to obtain zirconia ceramic pieces, wherein the cutting process parameters are as follows: the line diameter of a cutting line is 0.14-0.30mm, the line feeding speed is 0.1-5mm/min, the line speed is 1000-1500m/min, the line tension is 10-50N, and the tilt angle is -7 degrees to 7 degrees; and perform silk screen printing on the zirconia ceramic pieces to obtain the cover plate of the induction identification module. The cover plate of the induction identification module prepared by the preparation method of the cover plate of the induction identification module has relatively high strength, better density and higher dielectric property.

The invention discloses a high temperature resistant boron nitride-cerium feldspar ceramic matrix composite material and a preparation method thereof, and relates to the technical field of preparationof ceramic matrix composite materials. The preparation method comprises the steps of S1, weighing cerium feldspar powder to be mixed with hexagonal boron nitride powder to obtain a raw material; S2,ball-milling the raw material to obtain ball-milled powder; S3, stirring and drying the ball-milled powder to obtain raw material powder; S4, placing the raw material powder into a graphite mold, andcold-pressing is performed to obtain a bulk material; S5, performing discharge plasma sintering on the bulk material to obtain the high temperature resistant boron nitride-cerium feldspar ceramic matrix composite material. The preparation method of the high temperature resistant boron nitride-cerium feldspar ceramic matrix composite material has the advantages that the prepared boron nitride-cerium feldspar ceramic matrix composite material not only has good mechanical and processability performance by introducing boron nitride into cerium feldspar, but also has good dielectric and high temperature resistance performance.

The invention discloses a boron nitride-strontium feldspar ceramic-based composite material for aerospace heat protection and a preparation method of the composite material, and relates to the field of ceramic-based composite materials. The preparation method of the composite material includes the steps: S1 weighing and mixing strontium feldspar powder and hexagonal boron nitride powder to obtainraw material powder; S2 ball-milling the raw material powder to obtain ball-milled powder; S3 stirring and drying the ball-milled powder to obtain raw material powder; S4 cold-pressing the raw material powder to obtain bulk raw materials; S5 hot-pressing and sintering the bulk raw materials to obtain the boron nitride-strontium feldspar ceramic-based composite material for aerospace heat protection. According to the preparation method of the boron nitride-strontium feldspar ceramic-based composite material for aerospace heat protection, on the premise of ensuring the dielectric property of theboron nitride-strontium feldspar ceramic-based composite material, the prepared boron nitride-strontium feldspar ceramic-based composite material has good mechanical and machinable properties.