Water-based adhesive and preparation method and applications thereof

A water-based adhesive and initiator technology, used in adhesive types, ester copolymer adhesives, fixed capacitor dielectrics, etc. big problem

Inactive Publication Date: 2010-06-02
GUANGDONG FENGHUA ADVANCED TECH HLDG
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Chinese patent CN1172876 provides a method for preparing ceramic sheets by water-based casting. Sodium alginate and calcium iodate are introduced into the system to obtain high-density ceramic sheets, but at the same time, alkali metal ions are introduced, which will cause dielectric loss of MLCC. The rapid increase, this method is not suitable for the preparation of MLCC diaphragm
Especially for high-layer and large-capacity MLCC, it is required that the thermal decomposition temperature of the adhesive is lowered, the thermal weight loss rate is high, and the porcelain powder can be combined with the adhesive better, etc., which cannot be achieved by current PVB adhesives.
US Patent US5519087 once pointed out that BaTiO 3 It is suitable for water-based tape casting with polyacrylate as binder, but this patent focuses on demonstrating that polyacrylate binder can be used for water-based tape casting of powder, and does not report on the performance of MLCC

Method used

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  • Water-based adhesive and preparation method and applications thereof
  • Water-based adhesive and preparation method and applications thereof

Examples

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specific Embodiment

[0021] The formulation of a water-based adhesive is shown in the formulations of Examples 1-4. Weigh sodium lauryl sulfate and octylphenol polyoxyethylene ether OP10, dissolve them in conical flasks filled with 300mL, 300mL, 250mL, and 350mL deionized water respectively, stir until completely dissolved, and then The mass of the monomer was weighed, poured into the emulsifier solution in each Erlenmeyer flask, and stirred with high-speed magnetic force for 30 minutes respectively.

[0022] Take 180mL, 200mL, 200mL, and 180mL pre-emulsified solution from four conical flasks and pour them into four four-neck flasks with a capacity of 1000mL and stir them at 300 rpm, 200 rpm, and 350 rpm. minutes, 400 rpm. Stir and heat up to 75°C, add 1 / 2 of the dissolved ammonium persulfate solution respectively, react until the solution is transparent, heat up to about 85°C and use 110 drops / min, 150 drops / min, 180 drops / min, 90 drops Add the pre-emulsified solution dropwise per minute. After...

Embodiment 1

[0023] Example 1 The average diameter of latex particles is 85nm, and the solid content is 39.1%.

Embodiment 2

[0024] Example 2 The average diameter of latex particles is 90nm, and the solid content is 39.5%.

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Abstract

The invention relates to a water-based adhesive and a preparation method and applications thereof. The water-based adhesive comprises the following components in percentage by weight: 1-8% of acrylic acid or methacrylic acid, 5-20% of methyl methacrylate, 10-40% of acrylic ester, 0.5-5% of compounded emulsifier, 0.1-0.5% of initiator and 40-80% of deionized water. The preparation method comprises the following steps of: A. firstly dissolving the emulsifier in water, and then adding the acrylic acid or the methacrylic acid, the methyl methacrylate and the acrylic ester to the emulsifier solution for preemulsification; B. pouring 1 / 4-1 / 3 of the emulsified liquid in Step A in a reaction kettle, stirring and heating to 65-75 DEG C, adding the initiator solution, and reacting until the solution is transparent; and C. heating the solution in Step B for synthetic reaction, gradually dropping the remaining emulsified liquid to the reaction system, adding the remaining initiator solution after dropping, and adjusting the pH value. The adhesive is applied to MLCC capacitors and has the advantages of low cost, good performance and good environmental friendliness.

Description

technical field [0001] The invention relates to a water-based adhesive and a preparation method thereof, in particular to a water-based adhesive applied to a multilayer ceramic capacitor MLCC and a preparation method thereof. Background technique [0002] At present, the production of MLCC is mainly based on tape casting, using polyvinyl butyral (PVB) adhesives, absolute ethanol, and toluene as solvents. Anhydrous ethanol and toluene are poisonous and flammable products, and their massive discharge seriously pollutes the environment, deteriorates working conditions, and damages human health. The use of organic solvents causes the raising of production cost simultaneously. At present, the tape casting of PVB system has strict requirements on the humidity of the environment, and any moisture is not allowed to enter the system during the entire production process, otherwise it will directly cause the defects of the diaphragm and the decline of the performance of the capacitor,...

Claims

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Application Information

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IPC IPC(8): C09J133/08H01G4/12
Inventor 曹秀华
Owner GUANGDONG FENGHUA ADVANCED TECH HLDG
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