More than 75% is used as a solvent for coatings, inks, cleaning agents, etc., and its non-solvent uses include brake fluid, antifreeze and other chemical intermediates. It can be used as a solvent for nitrocellulose, varnishes, resins and oils, etc.
1) Prepare an organic binder for the back electrode silver paste of crystalline silicon photovoltaic cells, which is composed of: 1-10% ethyl cellulose, 1-5% cellulose acetate butyrate, diethylene glycol butyl Ether acetate 50-70%, diethylene glycol butyl ether 10-40%, dodecyl alcohol ester 1-5%, castor oil derivative 0.1-0.5%, tallow propylene diamine oleate 0.1-3 %. The preparation method is as follows: uniformly mixing diethylene glycol butyl ether, diethylene glycol butyl ether acetate, ethyl cellulose, cellulose acetate butyrate, dodecyl alcohol ester and hydrogenated castor oil derivative, and heating to 80 ℃-90 ℃, constant temperature reaction for 1.5-2.5 hours, after complete dissolution, add tallow propylene diamine oleate, stir evenly, cool and filter to obtain organic binder. Using the organic binder of the present invention to prepare the backside silver paste for crystalline silicon photovoltaic cells has good anti-settling effect, good fluidity and good screen printing performance.
2) Prepare a resistance paste, which is prepared from the following raw materials in parts by weight: 50-100 parts of conductive phase, 100-150 parts of inorganic phase, 200-500 parts of organic phase, and 25-50 parts of auxiliary; wherein: conductive phase The phase is 20-30% flake graphite powder, 40-50% ruthenium dioxide powder, 50-60% nano silver powder; the inorganic phase is 22-60% silicon oxide, 13-30% calcium oxide, 5-23% barium oxide, 12-28% antimony trioxide, 15-25% phosphorus pentoxide; organic phase is 16-36% diethylene glycol butyl ether, 21-35% diethylene glycol butyl ether acetate, 18-28% lemon Tributyl acid, 7-12% ethyl cellulose, 6-18% hydrogenated castor oil, 0-8% polyamide wax, 18-30% silicone resin; auxiliary agent is 16-55% nano-carbon conductive Filler, 24-48% ultra-fine base metal alloy powder conductive filler; the resistance paste of the present invention has strong adhesion to the substrate and is resistant to aging. Moreover, the method has simple process requirements and low manufacturing cost.
3) Prepare a resistance paste suitable for aluminum silicon carbide substrate, the resistance paste includes the following materials: conductive phase 15%-30%, glass powder 43%-55%, organic phase 26%-34%, auxiliary agent 1%-3%; the conductive phase is composed of one or two or three of micron silver powder, nanometer silver powder and RuO2 powder; glass powder is composed of silicon oxide, zinc oxide, bismuth oxide, boron oxide, aluminum oxide and pentoxide The organic phase is composed of diethylene glycol butyl ether, diethylene glycol butyl ether acetate, dibutyl phthalate, tributyl citrate and ethyl cellulose; the resistance paste contains lead content It is 0 and the thermal properties have a high degree of matching with the aluminum silicon carbide substrate and the dielectric layer. The resistance layer formed by sintering can not be peeled or bubbled, and the bonding force with the dielectric layer is extremely strong. The preparation method includes: preparing glass powder, preparing organic phase, preparing resistance paste, screen printing and sintering a dielectric layer, screen printing and sintering a resistance layer, measuring square resistance and reburning change rate.
4) Preparation of a low-temperature co-fired ceramic powder paste for preparing LED substrates, including the following steps: (1) mixing calcium carbonate, silicon dioxide, boric acid, and zinc oxide, mixing uniformly, melting and quenching to obtain glass fragments, Drying, crushing and sieving the glass fragments to obtain glass powder; (2) mixing the glass powder and alumina powder, adding deionized water to ball milling, and sieving and drying the ball-milled slurry to obtain Low temperature co-fired ceramic powder; (3) after fully mixing terpineol, castor oil, diethylene glycol butyl ether and diethylene glycol butyl ether acetate, adding polyvinyl butyral to dissolve to obtain a mixed organic carrier, The mixed organic carrier and the low-temperature co-fired ceramic powder are mixed and ground to obtain a low-temperature co-fired ceramic powder paste. The low-temperature co-fired ceramic powder paste prepared by the invention can be formed into various shapes on the LED alumina substrate printed with the silver circuit through the dispensing process according to the design scheme, which brings great convenience and flexibility to the design of the LED light source.