A kind of preparation method of conductive polyurethane prepolymer and its conductive adhesive

A polyurethane prepolymer and conductive adhesive technology, applied in the field of conductive adhesive, can solve problems such as inability to improve electrical conductivity, uneven dispersion of the conductive adhesive system, and unusable products, so as to improve production efficiency, eliminate grain boundaries, and solve The effect of spreading the problem

Active Publication Date: 2022-02-11
佛山市瑞联福电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high surface activity of nano-silver, the solution of directly adding nano-silver powder to the conductive adhesive is prone to system incompatibility, that is, agglomeration occurs after adding nano-silver. There is uneven dispersion of the conductive adhesive system, which makes the product unusable

Method used

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  • A kind of preparation method of conductive polyurethane prepolymer and its conductive adhesive
  • A kind of preparation method of conductive polyurethane prepolymer and its conductive adhesive
  • A kind of preparation method of conductive polyurethane prepolymer and its conductive adhesive

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preparation example Construction

[0033] A preparation method of conductive polyurethane prepolymer, comprising the following steps:

[0034] (1) Prepare an aqueous solution of polyhydric alcohol with a concentration of 30-100wt%, and preheat to 40-60°C;

[0035] (2) dissolving silver nitrate accounting for 1-30wt% of the current content in the above-mentioned aqueous solution;

[0036] (3) adding nano-silver surface protection agent, its consumption is controlled within the 1wt% that accounts for current silver ion content; Nano-silver surface protection agent is organic carboxylic acid or organic amine, obtains silver ion solution;

[0037] Organic carboxylic acids contain 2 or more carbon atoms, and organic amines contain 2 or more carbon atoms;

[0038] (4) preparation of reducing agent aqueous solution; then drop reducing agent aqueous solution to the silver ion solution obtained in step (3), the reducing agent aqueous solution and silver ion solution proportioning 1: [0.1-1);

[0039] (5) Heating to 10...

Embodiment A

[0073] A preparation method of conductive polyurethane prepolymer, comprising the following steps:

[0074] (1) Prepare an aqueous solution of polyhydric alcohol with a concentration of 50 wt%, and preheat it to 50°C; the polyhydric alcohol is polyethylene glycol and polypropylene glycol, and the molecular weight is controlled at 1000-2000g / mol;

[0075] (2) dissolving silver nitrate accounting for 5wt% of the current content in the above-mentioned aqueous solution;

[0076] (3) add nano-silver surface protection agent, its concentration is controlled in the scope as shown in table 1; Surface protection agent is caprylic acid;

[0077] (4) Prepare an aqueous solution of hydrazine hydrate and sodium borohydride water combination, the concentration is 20g / L; then drop the reducing agent aqueous solution to the silver ion solution obtained in step (3), the reducing agent aqueous solution and silver ion solution ratio 1:0.9 ;

[0078] (5) Heat to 100°C, and after 40 minutes of r...

Embodiment B

[0090] A preparation method of conductive polyurethane prepolymer, comprising the following steps:

[0091] (1) Prepare an aqueous solution of polyhydric alcohol with a concentration of 50 wt%, and preheat it to 50°C; the polyhydric alcohol is polyethylene glycol and polypropylene glycol, and the molecular weight is controlled at 1000-2000g / mol;

[0092] (2) dissolving silver nitrate accounting for 5wt% of the current content in the above-mentioned aqueous solution;

[0093] (3) add nano-silver surface protection agent, its concentration is controlled at 0.4%; Surface protection agent is as shown in table 3;

[0094] (4) Prepare an aqueous solution of hydrazine hydrate and sodium borohydride water combination, the concentration is 20g / L; then drop the reducing agent aqueous solution to the silver ion solution obtained in step (3), the reducing agent aqueous solution and silver ion solution ratio 1:0.9 ;

[0095] (5) Heat to 100°C, and after 40 minutes of reaction, vacuumize ...

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Abstract

A preparation method of a conductive polyurethane prepolymer and a conductive adhesive thereof, when the preparation method obtains a silver ion solution through steps (1)-step (2), add a nano-silver surface protective agent in step (3), and In step (4)-(6), the nano-silver particles stable in the resin are generated, and the polyurethane prepolymer containing the nano-silver particles is obtained. Its conductive adhesive includes: conductive filler, diluent, conductive polyurethane prepolymer, initiator and auxiliary agent. The invention adopts a simple one-pot method to prepare conductive polyurethane prepolymer containing nano-silver particles, which not only solves the dispersion problem of nano-powder in the resin system, but also simplifies the preparation process of nano-materials, reduces costs and improves production efficiency .

Description

technical field [0001] The invention relates to the technical field of conductive adhesives, in particular to a method for preparing a conductive polyurethane prepolymer and the conductive adhesive. Background technique [0002] Conventional conductive adhesives are composed of conductive fillers, resins, diluents, initiators, and various additives. Conductive adhesives are generally used in bonding scenarios, that is, sandwiched between two interfaces to be bonded. Therefore, it is usually required that the conductive adhesive does not contain solvents, or contains a small amount of volatile solvents. Containing solvents may cause bubbles during the heating and curing process of the conductive adhesive, resulting in bonding defects. Thus, the viscosity adjustment and control of conductive adhesives strongly depend on the use of diluents. Thinner is a reactive low-molecular compound that can react with the main resin and fix it, so that it will not cause a large number of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/48C08G18/12C08G18/62C08K3/08C09J9/02C09J175/08
CPCC08G18/4833C08G18/4825C08G18/4808C08G18/12C08K3/08C09J9/02C09J175/08C08K2201/011C08K2201/001C08K2003/0806C08G18/6216
Inventor 胡永能周虎高峰陈法波黄良辉
Owner 佛山市瑞联福电子科技有限公司
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