30results about How to "Improve biaxial tensile properties" patented technology

The invention discloses a heat-conduction double-sided bonded graphite flake. The heat-conduction double-sided bonded graphite flake is arranged between a heat dissipation part and a heating part in a close contact way and comprises a light-stripped PET film and a heavily-stripped PET film, a first heat-conduction adhesive layer, a graphite layer and a second heat-conduction adhesive layer are sequentially arranged between the light-stripped PET film and the heavily-stripped PET film, an upper surface and a lower surface of the graphite layer on a polyimide film are respectively coated with a layer of graphite modifier to obtain the processed polyimide film, and the graphite modifier comprises the following constituents based on part by weight: 22 parts of benzophenone dianhydride, 15.6 parts of pyromellitic dianhydride, 26 parts of diaminodiphenylmethane, 32 parts of dimethylformamide, 1.8 parts of ethylene glycol and 2.2 parts of polydimethylsiloxane. A calendaring machine is used for calendaring a pre-sintered carbonization film, and draped lines and volume shrinkage during graphitization sintering process are prevented.

The invention discloses a high-heat-conductivity-coefficient radiating patch. The high-heat-conductivity-coefficient radiating patch is characterized in that a graphite layer is obtained by a following process method including the following steps: respectively coating a layer of graphite modifying agent on the upper and lower surfaces of a polyimide membrane so as to obtain the processed polyimide membrane, wherein the graphite modifying agent comprises the following components in parts by weight: 30-35 parts of benzenetetracarboxylic anhydride, 10-15 parts of benzophenone tetracarboxylic dianhydride, 22-26 parts of diaminodiphenylmethane, 20-25 parts of dimethylformamide, 8-10 parts of N-methyl pyrrolidone, 1.8-2.5 parts of ethylene glycol, 2.5-3 parts of polydimethylsiloxane and 0.8-1.5 parts of dibutyl phthalate; heating the processed polyimide membrane to be 790-810 DEG C, and heating the polyimide membrane to 1180-1250 DEG C so as to obtain a pre-fired carbonization membrane; calendering the pre-fired carbonization membrane by virtue of a calendar; heating the pre-fired carbonization membrane to 2850-2950 DEG C so as to obtain a mainly-fired graphite membrane. According to the high-heat-conductivity-coefficient radiating patch, the stability and reliability of the radiating performance of a product are improved when the uniformity of the heat-conducting performance is realized, and the cost of the product is greatly lowered.

The invention discloses a heat conduction graphite sheet and a manufacturing method thereof. The heat conduction graphite sheet consists of a polyimide film, a first coating layer and a second coating layer, wherein the first coating layer and the second coating layer are positioned on the upper and lower surfaces of the polyimide film respectively and are formed by sintering graphite modifiers respectively; each graphite modifier consists of the following components in parts by weight: 20-25 parts of benzophenonetetracarboxylic dianhydride, 14-16 parts of benzenetetracarboxylic anhydride, 22-26 parts of diaminodiphenylmethane, 20-25 parts of dimethyl formamide, 8-10 parts of N-methyl pyrrolidinone, 1.8-2.5 parts of ethylene glycol and 2.5-3 parts of polydimethylsiloxane. The heat conduction performance of the heat conduction graphite sheet is improved in the vertical direction and the horizontal direction, local overheating is avoided, the uniformity of the heat conduction performance is realized, and meanwhile, the stability and reliability of the heat dissipation performance of a product are improved; the cost of the product is greatly reduced.

The invention relates to a preparation process for a graphite heat conduction and dissipation patch. A first coating layer of the graphite heat conduction and dissipation patch is formed from a graphite modifier applied onto the upper surface of a polyimide thin film, and the graphite modifier comprises the following constituents by weight percent: benzophenonetetracarboxylic dianhydride, pyromellitic dinahydride anhydride, diaminodiphenylmethane, dimethylformamide, N-methyl-2-pyrrolidone, ethylene glycol, polydimethylsiloxane and dibutyl phthalate. The preparation process comprises the following steps of applying the graphite modifier onto the upper surface of the polyimide thin film to obtain the processed polyimide thin film; rising the temperature of a carbonization film to be 2,350-2,450 DEG C, carrying out heat preservation, rising the temperature again to be 2,850-2,950 DEG C, and cooling the carbonization film to obtain a graphite film mainly sintered. By the preparation process, local heating is prevented, the uniformity of heat conduction performance is achieved, meanwhile, the stability and the reliability of heat dissipation performance of a product are improved, and the product cost is greatly reduced.

The invention discloses a pressure sensitive adhesive tape for a microelectronic device. The pressure sensitive adhesive tape is attached to the surface of a heating part, and a graphite layer is obtained through the following process methods: respectively coating a graphite modifier on the upper surface and the lower surface of a polyimide film to obtain a treated polyimide film, wherein the graphite modifier consists of the following components in parts by weight: 25-30 parts of benzenetetracarboxylic anhydride, 10-15 parts of benzophenonetetracarboxylic anhydride, 20-28 parts of diaminodiphenylmethane, 20-25 parts of dimethyl formamide, 8-10 parts of N-methyl pyrrolidone, 1.5-2.5 parts of ethylene glycol and 2-3 parts of polydimethylsiloxane; raising the temperature of the treated polyimide film to 800 DEG C, keeping the temperature, raising the temperature to 1,200 DEG C, and obtaining a pre-sintered carbide film; rolling the pre-sintered carbide film in the step 4 by adopting a roller mill. The uniformity of heat-conducting property of the adhesive tape is realized, the heat dissipation performance, stability and reliability of the product are improved, and the cost of the product is greatly lowered.

The invention discloses a two-way stretchable supercapacitor and a preparation method thereof. The supercapacitor is composed of carbon nanotube film electrodes, elastic polymer matrix and gel electrolyte, wherein the carbon nanotube film electrodes have an interconnected network structure. The carbon nanotube film electrode material is flexible, deformable and stretchable, and endows the supercapacitor with bidirectional stretchability. The bidirectionally stretchable supercapacitor provided by the present invention can be a planar structure or a sandwich sandwich structure. The supercapacitor prepared by the invention can be vertically stretched by 30%-100% in two directions in the plane, and maintain stable electrochemical performance, and the supercapacitor also has reciprocating stretching performance. The preparation method of the bidirectionally stretchable supercapacitor provided by the present invention is simple and easy to realize, and can realize mass production, and is used in various fields such as wearable electronics, electronic skin, and intelligent integrated devices.

A manufacturing process for graphite radiating fins of the invention comprises the following steps: coating the upper and lower surfaces of a polyimide film with a layer of graphite modifier, wherein the polyimide film after processing is composed of a polyimide film, a first coating layer and a second coating layer, and the graphite modifier comprises, by weight, 20-25 parts of benzophenonetetracarboxylic dianhydride, 12-18 parts of pyromellitic dianhydride, 20-28 parts of diaminodiphenyl methane, 20-25 parts of dimethylformamide, 8-10 parts of N-methyl pyrrolidone, 1.5-2.5 parts of ethylene glycol, 2-3 parts of polydimethylsiloxane, and 0.8-1.5 parts of dibutyl phthalate; heating the polyimide film after processing from room temperature to 1200 DEG C to obtain a pre-fired carbonized film; and heating the carbonized film to 2850-2950 DEG C to obtain a fired graphite film. Uniform heat conduction performance is achieved, and meanwhile, the radiating performance, stability and reliability of products are improved, and the cost of products is greatly reduced.

The invention discloses a high-reliability double-sided screen protector. The radiating double-sided screen protector is fitted between a radiating part and a heating part, a first heat conduction adhesive layer, a graphitic layer and a second heat conduction adhesive layer are sequentially arranged between a light peel-off type PET (polyester) film and a heavy peel-off type PET film, the graphitic layer is obtained according to the following process method comprising the step of coating a layer of graphite modifier on both the upper surface and the lower surface of a polyimide film to acquire the processed polyimide film, the graphite modifier comprises the following components in parts by weight: 20-25 parts of benzophenonetetracarboxylicdianhydride, 12-18 parts of pyromelliticdianhydride,20-28 parts of diaminodiphenylmethane, 30-35 parts of dimethylformamide, 1.5-2.5 parts of ethylene glycol, and 2-3 parts of polydimethylsiloxane. The heat conduction performances in both the vertical direction and the horizontal direction are improved, the local overheating of an adhesive tape is avoided, the stability and the reliability of the radiating performance of a product are improved, and the cost of the product is greatly lowered.

The invention discloses a heat conduction graphite paster for adhesive tape and a preparing method of the heat conduction graphite paster. The surface of the heat conduction graphite paster is coated with a heat conduction adhesive layer, the heat conduction graphite paster is composed of a polyimide film, a first coating layer and a second coating layer, and the first coating layer and the second coating layer are located on the upper surface and the lower surface of the polyimide film respectively. The first coating layer and the second coating layer respectively comprise, by weight, 20-25 parts of benzophenone tetracid dianhydride, 12-18 parts of pyromellitic acid dianhydride, 20-28 parts of diaminodiphenylmethane, 20-25 parts of dimethyl formamide, 8-10 parts of N-methyl pyrrolidone, 1.5-2.5 parts of ethylene glycol, 2-3 parts of dimethyl silicone polymer and 0.8-1.5 parts of phthalic acid dibutyl ester. According to the heat conduction graphite paster, local overheating is avoided, the evenness of the heat conduction performance is achieved, the stability and reliability of the heat dissipation performance of the heat conduction graphite paster are improved, and the cost of the heat conduction graphite paster is reduced.

The invention discloses a heat conduction graphite patch for a microelectronic device. The heat conduction graphite patch comprises a first heat conduction adhesive layer, a graphite layer and a second heat conduction adhesive layer, the graphite layer is obtained through the following technique, and the technique comprises the following steps that the upper surface and the lower surface of a polyimide film after the first step are coated with graphite modifiers to obtain the processed polyimide film; the processed polyimide film is heated to 800 DEG C, heat preservation is carried out, and then the film is heated to 1200 DEG C to obtain a pre-burned carbonization film; a calender is adopted to calender the pre-burned carbonization film in the fourth step; the carbonization film is heated to 2400 DEG C, heat preservation is carried out, then the film is heated to 2900 DEG C, and therefore a mainly-burnt graphite film is obtained; the mainly-burnt graphite film obtained in the fifth step is calendered to obtain the graphite layer. The method avoids local overheating of adhesive tape, uniformity of heat conduction performance of the adhesive tape is achieved, the stability and reliability of heat dissipation performance of the patch are improved, and the cost of the patch is greatly reduced.

The present invention discloses a high-compactness and heat dissipating double-sided adhesion film, wherein a release material layer is adhered on a heat conduction adhesion layer surface opposite to a graphite layer, and the graphite layer preparation method comprises: uniformly coating the upper surface and the lower surface of a polyimide film with a layer of a graphite modifier to obtain a treated polyimide film, wherein the viscosity of the graphite modifier is 30000-48000 CP; heating the treated polyimide film to a temperature of 1180-1250 DEG C from a room temperature, and cooling to obtain a pre-fired carbonized film; calendering the pre-fired carbonized film with a calendering machine; heating to a temperature of 2850-2950 DEG C to obtain a mainly-fired graphite film; and calendering the obtained mainly-fired graphite film to obtain the graphite layer. According to the present invention, the volume shrinkage during the wrinkling and graphitization sintering process is avoided, the compactness and the crystallinity are increased, and the heat conduction performances in the vertical direction and the horizontal direction are further improved.