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Preparation method of silicon dioxide filled polytetrafluoroethylene dispersion solution

A technology of polytetrafluoroethylene and silicon dioxide, which is applied in the field of preparation of silica-filled polytetrafluoroethylene dispersions, can solve the problems of high equipment material and precision requirements, no reinforcing material support for plates, and low mechanical strength. Achieve the effects of improving uniformity, leveling and sedimentation

Inactive Publication Date: 2019-08-27
金宝电子(铜陵)有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of the existing technology, such as high difficulty in operation, high requirements on equipment material and precision, no reinforcement material support for the plate, and low mechanical strength.

Method used

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with example:

[0021] A preparation method of silicon dioxide filled polytetrafluoroethylene dispersion comprises the following steps:

[0022] Step 1 Make dispersion A: a. Weigh 100 parts of polytetrafluoroethylene dispersion (dispersion medium is water) with a solid content of 60%, pour it into a 1# constant temperature stirring tank for stirring, set the temperature at 20-25°C , the stirring speed is 300~600rpm; b. Add glacial acetic acid to the 1# stirred tank to prepare the dispersion liquid A for use;

[0023] Step 2 to make mixed solution B: a. Add fused silica powder (D50≤5μm, D100≤10μm) into the planetary ball mill; b. Take another container and mix dimethyl maleate ammonium salt and polyisocyanate Methyl cyanate, add deionized water and mix evenly to prepare mixed solution B;

[0024] Step 3: making slurry C: Pour the mixed solution B into a planetary ball mill, turn on the ball mill, set ...

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Abstract

The invention provides a preparation method of a silicon dioxide filled polytetrafluoroethylene dispersion solution. Dispersion mixing is carried out on a packing and polytetrafluoroethylene in a liquid medium, mixing time and operation difficulty are far below traditional solid powder mixing time and operation difficulty, and the preparation method can be used for an impregnation technology; through the dispersion solution, the interface bonding force of the packing and polytetrafluoroethylene is improved, and the surface defects in the impregnation process are improved; the preparation method is extremely applicable for impregnated glass cloth, and is used for producing a high-performance polytetrafluoroethylene copper-clad plate; the disadvantage that an existing copper-clad plate is large in coefficient of thermal expansion, low in abrasive resistance and low in mechanical strength is solved effectively, the sedimentation problem of the inorganic packing is improved, the uniformityof glue components is improved obviously, according to the method, particles of the packing are repelled mutually through space steric hindrance and charge repulsion effect, the suspension time of the particles is prolonged, and the uniformity of dispersion is guaranteed.

Description

technical field [0001] The invention belongs to a preparation method of a polytetrafluoroethylene dispersion, in particular to a preparation method of a silica-filled polytetrafluoroethylene dispersion. Background technique [0002] PTFE has excellent chemical stability and dielectric properties, and can be used in the production of high-frequency copper clad laminates. However, due to its shortcomings such as large thermal expansion coefficient, poor wear resistance, and low mechanical strength, the processability of copper clad laminates is poor, which limits its further application. In order to improve the processability of copper clad laminates, the industry adds inorganic fillers to polytetrafluoroethylene. To solve the problem, the main method is to mix solid polytetrafluoroethylene and inorganic fillers and sinter them, then cut them into thin films, and perform lamination and hot-pressing composite boards. The principle of this method is simple, but the operation is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/205C08L27/18C08L83/04C08L75/04C08K3/36
CPCC08J3/20C08J2327/18C08J2475/04C08J2483/04C08K3/36C08K2201/003
Inventor 阮安俊胡金山孙茂云
Owner 金宝电子(铜陵)有限公司
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