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Preparation method of ceramic filled polytetrafluoroethylene microwave composite dielectric substrate

A technology of polytetrafluoroethylene and composite media, applied in the field of copper clad laminates, can solve the problems of low dielectric constant, low thermal expansion coefficient, small dielectric constant temperature coefficient, etc., and achieve good modification effect, small thermal expansion coefficient and compact structure Effect

Active Publication Date: 2019-02-26
汕头超声覆铜板科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The problem to be solved by the present invention is to obtain a single ceramic-filled PTFE-based microwave composite dielectric substrate material by simplifying the process flow, which has low dielectric constant, ultra-low dielectric loss, low thermal expansion coefficient and small dielectric constant Temperature Coefficient

Method used

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  • Preparation method of ceramic filled polytetrafluoroethylene microwave composite dielectric substrate
  • Preparation method of ceramic filled polytetrafluoroethylene microwave composite dielectric substrate
  • Preparation method of ceramic filled polytetrafluoroethylene microwave composite dielectric substrate

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preparation example Construction

[0029] The preparation method of polytetrafluoroethylene composite microwave ceramic substrate comprises the following steps:

[0030] Step 1: Prefabrication of silica powder. Include the following specific steps:

[0031] Step 1-1: Dry in an oven to remove physically adsorbed water from the silica ceramic powder, and dry at a temperature of 120-150°C for 8-12 hours;

[0032] Step 1-2: Add the raw materials prepared in step 1-1 to the mixture of hydrogen peroxide and concentrated hydrochloric acid (20:80-40:60) by mass ratio, boil at 50-70°C while stirring for 1-2 hours to increase The surface hydroxyl group is convenient to react with the silane coupling agent behind.

[0033] Step 1-3: Suction filter the suspension obtained in Step 1-2, and then dry it under vacuum at 105-120°C for 12-24 hours. ;

[0034] Step 2: Surface treatment of silica powder. Include the following specific steps:

[0035] Step 2-1: Weigh a certain amount of agate balls and add them to the ball mi...

Embodiment approach

[0043] A more specific implementation is as follows:

[0044] The preparation method of the polytetrafluoroethylene-based microwave composite dielectric substrate material of the present invention comprises the following steps:

[0045] a. Prefabricated silica powder: dry the silica in an oven to remove physically adsorbed water, then add the silica to the mixture of hydrogen peroxide and concentrated hydrochloric acid to activate and increase the hydroxyl effect on the surface of the silica, and suction filter , then dry.

[0046] b. Using a ball milling process, modifying and hydrophobicizing the surface of the silica with a silane coupling agent, and finally drying and sieving to obtain the treated silica powder.

[0047] c. Using a ball milling process, mix silica powder, chopped glass fiber and polytetrafluoroethylene in proportion, and then demulsify with a demulsifier to obtain dough.

[0048] d. Obtain a green sheet through a calendering process, pre-baked, cut, coat...

Embodiment 1

[0066] a) Weigh 200g of silicon dioxide, dry the silicon dioxide in an oven at 120-150°C for 8-12 hours to remove physically adsorbed water, and prepare 150ml of a mixture of hydrogen peroxide and concentrated hydrochloric acid in a three-necked reflux flask (hydrogen peroxide: concentrated hydrochloric acid =20:80~40:60), then add silicon dioxide into the mixed solution and boil at 50~70°C while stirring for 1~2h to activate and increase the hydroxyl effect on the surface of silicon dioxide, then filter the silicon dioxide with suction, Dry at 105-120°C for 12-24 hours in a vacuum environment.

[0067] b) Weigh 0.8 g of KH550 coupling agent and 2.2 g of phenyltrimethoxysilane coupling agent. Weigh 58.5 g of deionized water and 136.5 g of alcohol, then add glacial acetic acid to the mixed liquid of deionized water and alcohol to adjust pH=4. Weigh 300g of cleaned agate balls of 8-14mm, add the agate balls, pH adjusting mixture, coupling agent and activated silica ceramic powd...

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Abstract

A preparing method of a ceramic-filled polytetrafluoroethylene microwave composite-medium substrate is disclosed. The method includes 1) adding silicon dioxide ceramic powder into a liquid mixture of hydrogen peroxide and concentrated hydrochloric acid after the silicon dioxide ceramic powder is dried, and heating the mixture to 50-70 DEG C to obtain a suspension; 2) subjecting the suspension to suction filtration and drying a product in a vacuum environment; 3) adding the silicon dioxide ceramic powder obtained in the step 2) into a solution mixture of deionized water and absolute alcohol, adjusting the pH value to be 3-5, weighing a coupling agent the weight of which is 1.0-2.5% of the weight of the silicon dioxide ceramic powder, performing ball milling, and fully mixing the mixture to obtain a material mixture; 4) filtering and drying the material mixture to obtain modified silicon dioxide ceramic powder; 5) ball-milling and mixing the modified silicon dioxide powder, chopped glass fibers and polytetrafluoroethylene, and then performing demulsification to obtain dough; and 6) subjecting the dough to molding and hot-pressed sintering. The ceramic-filled material prepared by the method has a low dielectric constant (with epsilon being equal to 2.94), ultralow dielectric loss (with tg[delta] being less than 0.0008, 10 GHz), low water absorption (less than 0.02%) and a small thermal expansion coefficient (less than 20 ppm / DEG C).

Description

technical field [0001] The invention relates to a copper clad laminate, a polytetrafluoroethylene-based microwave composite dielectric substrate material with low dielectric constant and low loss and a preparation method thereof, belonging to the field of organic / inorganic composite materials. Background technique [0002] Today, with the rapid growth of the wireless communication field, not only the miniaturization of the circuit is required, but also the very high integrity of the circuit signal transmission is required. Relative permittivity (ε r ) and dielectric loss (tanδ) play a decisive role. Composite microwave dielectric substrate materials refer to special microwave circuit substrate materials that can process a large amount of information at microwave frequencies. This material is widely used in airborne radar devices, phased array systems, remote sensing and other airborne satellite microstrip planar antennas, portable fields such as mobile antennas. The phase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/06C08K3/36C08K7/14C08L27/18
CPCC08K3/36C08K7/14C08K9/06C08L2203/20C08L27/18
Inventor 袁颖林浩东唐斌李恩竹张树人
Owner 汕头超声覆铜板科技有限公司
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