阅读说明：本技术 一种流动度较低半固化片制备方法 (Preparation method of prepreg with low fluidity ) 是由 苏晓渭 刘强 李勇军 于 2021-07-12 设计创作，主要内容包括：本发明公开了一种流动度较低半固化片制备方法,步骤1、准备材料,选择树脂组合物、离型膜和基材填充料；步骤2、制作半固化片基片,通过将树脂组合物放置到上胶机中,然后通过上胶机将树脂组合物浸渍到基材填充料中,然后进行热处理,提高其半固化程度,精准控制溢胶量,得到流动度低的半固化片基片；步骤3、固化前的准备,通过辊压方式将离型膜安装在半固化片基片的一面,使得半固化基片的这一面得到保护；步骤4、进行固化成型,将上述离型膜保护的半固化片基片的另一面通过涂覆机上涂覆一层厚度为10-20μm的树脂层,然后在温度150-300℃烘箱中烘烤2-5min,烘干后得到单面流动度低的半固化片,本发明降低了半固化片的流动度,提高了半固化片的性能。(The invention discloses a preparation method of a prepreg with low fluidity, which comprises the following steps of 1, preparing materials, selecting a resin composition, a release film and a substrate filler; step 2, manufacturing a prepreg substrate, namely placing the resin composition into a gluing machine, then soaking the resin composition into a base material filler through the gluing machine, and then carrying out heat treatment to improve the semi-curing degree of the prepreg substrate and accurately control the glue overflow amount to obtain the prepreg substrate with low fluidity; step 3, preparation before curing, namely mounting the release film on one surface of the semi-cured substrate in a rolling mode, so that the surface of the semi-cured substrate is protected; and 4, carrying out curing molding, coating a resin layer with the thickness of 10-20 microns on the other surface of the prepreg substrate protected by the release film through a coating machine, then baking for 2-5min in an oven at the temperature of 150-300 ℃, and obtaining the prepreg with low single-side fluidity after baking.)

1. A preparation method of a prepreg with low fluidity is characterized by comprising the following steps: comprises the following steps:

step 1, preparing materials, selecting a resin composition, a release film and a substrate filler;

step 2, manufacturing a prepreg substrate, namely placing the resin composition into a gluing machine, then soaking the resin composition into a base material filler through the gluing machine, and then carrying out heat treatment to improve the semi-curing degree of the prepreg substrate and accurately control the glue overflow amount to obtain the prepreg substrate with low fluidity;

step 3, preparation before curing, namely mounting the release film on one surface of the semi-cured substrate in a rolling mode, so that the surface of the semi-cured substrate is protected;

and 4, carrying out curing molding, coating a resin layer with the thickness of 10-20 mu m on the other surface of the prepreg substrate protected by the release film through a coating machine, then baking for 2-5min in an oven at the temperature of 150-300 ℃, and drying to obtain the prepreg with low single-side fluidity.

2. The method for preparing the prepreg according to claim 1, wherein the method comprises the following steps: the filler of the base material is mostly metal oxide fiber or metal nitride fiber, and glass fiber cloth is mainly selected.

3. The method for preparing the prepreg according to claim 1, wherein the method comprises the following steps: the heat treatment in the step 2 is to bake in an oven with the temperature of 150-.

4. The method for preparing the prepreg according to claim 1, wherein the method comprises the following steps: in step 2, the gelation time is controlled to 165-185S, and the gel content is controlled to 45% -60%, so that the fluidity is below 30%.

5. The method for preparing the prepreg according to claim 1, wherein the method comprises the following steps: the resin composition of the prepreg substrate is a resin composition of an epoxy resin system and a low thermal expansion coefficient system; the resin composition of the resin layer is an epoxy resin system, a high heat resistance system and a low thermal expansion coefficient system.

6. The method for preparing the prepreg according to claim 1, wherein the method comprises the following steps: the manufactured prepreg is cut and detected, and the warp and weft directions of the prepreg need to be noticed during shearing because the yarn strands of the glass fiber cloth in the warp and weft unit lengths are different, so that the warp and weft directions are generally selected, the short edge direction of the production plate is neat, and the plate is prevented from being distorted and deformed after being heated.

7. The method for preparing the prepreg according to claim 1, wherein the method comprises the following steps: the steps of manufacturing the prepreg with low double-sided fluidity are as follows:

step 1, removing a release film of the prepared single-side low-flow-glue prepreg;

step 2, mounting a release film on one surface of the single-sided low-flow-glue prepreg, which is coated with the resin layer, through rolling for protection;

and 3, coating a resin layer with the thickness of 10-20 mu m on one side of the single-side low-flow-glue prepreg, which is not coated with the resin layer, on a coating machine, then baking in an oven at the temperature of 150-300 ℃ for 2-5min, and drying to obtain the double-side low-flow-glue prepreg.

Technical Field

The invention relates to a preparation method of a prepreg, in particular to a preparation method of a prepreg with low fluidity.

Background

The prepreg, also called as "PP sheet", is one of the main materials in the production of multilayer boards, and mainly comprises resin and reinforcing materials, the reinforcing materials are classified into several types such as glass fiber cloth, paper base, composite materials, and the like, and most prepregs (bonding sheets) used for manufacturing multilayer printed boards adopt glass fiber cloth as the reinforcing materials.

The main appearance requirements of prepregs for multilayer boards are: the cloth should be smooth, free of oil, smut, foreign matter or other imperfections, free of cracks and excess resin powder, but allow for micro-cracking. In the design process of the circuit board, if the design of the multilayer board is adopted, a prepreg is required.

The existing prepreg has high fluidity, and the performance of the prepreg is influenced.

Disclosure of Invention

Technical problem to be solved by the invention

The invention aims to provide a preparation method of a prepreg with low fluidity, which aims to solve the problems in the background art that the existing prepreg with high fluidity influences the performance of the prepreg.

Technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of a prepreg with low fluidity comprises the following steps:

step 1, preparing materials, selecting a resin composition, a release film and a substrate filler;

step 2, manufacturing a prepreg substrate, namely placing the resin composition into a gluing machine, then soaking the resin composition into a base material filler through the gluing machine, and then carrying out heat treatment to improve the semi-curing degree of the prepreg substrate and accurately control the glue overflow amount to obtain the prepreg substrate with low fluidity;

step 3, preparation before curing, namely mounting the release film on the prepreg substrate in a rolling mode

A surface such that the surface of the semi-cured substrate is protected;

and 4, carrying out curing molding, coating a resin layer with the thickness of 10-20 mu m on the other surface of the prepreg substrate protected by the release film through a coating machine, then baking for 2-5min in an oven at the temperature of 150-300 ℃, and drying to obtain the prepreg with low single-side fluidity.

Preferably, the base material filler is metal oxide fiber or metal nitride fiber, and glass fiber cloth is mainly selected.

Preferably, the heat treatment in step 2 is to bake in an oven at a temperature of 150-.

Preferably, in step 2, the gelation time is controlled to 165-185S, and the gel content is controlled to 45% -60%, so that the fluidity is below 30%.

Preferably, the resin composition of the prepreg substrate is a resin composition of an epoxy resin system and a low thermal expansion coefficient system; the resin composition of the resin layer is an epoxy resin system, a high heat resistance system and a low thermal expansion coefficient system.

Preferably, the manufactured prepreg is cut and detected, and the warp and weft directions of the prepreg need to be noticed during cutting due to the fact that the number of strands of the glass fiber cloth in the warp and weft unit lengths is different, and the warp direction is generally selected to be the short side direction of the production plate.

Preferably, the step of manufacturing the prepreg with low double-sided fluidity comprises the following steps:

step 1, removing a release film of the prepared single-side low-flow-glue prepreg;

step 2, mounting a release film on one surface of the single-sided low-flow-glue prepreg, which is coated with the resin layer, through rolling for protection;

and 3, coating a resin layer with the thickness of 10-20 mu m on one side of the single-side low-flow-glue prepreg, which is not coated with the resin layer, on a coating machine, then baking in an oven at the temperature of 150-300 ℃ for 2-5min, and drying to obtain the double-side low-flow-glue prepreg.

Advantageous effects

Compared with the prior art, the invention has the beneficial effects that: the preparation of the prepreg reduces the fluidity of the prepreg and improves the performance of the prepreg.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of protection of the present invention.

The invention provides a technical scheme that: a method for preparing a prepreg with lower fluidity,

example one

Comprises the following steps:

step 1, preparing materials, selecting a resin composition, a release film and a substrate filler;

step 2, manufacturing a prepreg substrate, namely placing the resin composition into a gluing machine, then soaking the resin composition into a base material filler through the gluing machine, and then carrying out heat treatment to improve the semi-curing degree of the prepreg substrate and accurately control the glue overflow amount to obtain the prepreg substrate with low fluidity;

step 3, preparation before curing, namely mounting the release film on one surface of the semi-cured substrate in a rolling mode, so that the surface of the semi-cured substrate is protected;

and 4, carrying out curing molding, coating a resin layer with the thickness of 20 microns on the other side of the prepreg substrate protected by the release film through a coating machine, then baking for 2min in an oven at the temperature of 300 ℃, and drying to obtain the prepreg with low single-side fluidity, wherein the prepreg is mainly dyed by adopting disperse dyes, the dyes can be divided into high-temperature types, an accelerator can also be used, the color depth is improved by using an anhydride accelerator, and the substrate filler is glass fiber cloth.

The heat treatment in the step 2 is to bake in an oven at the temperature of 200 ℃ for 10min to improve the semi-curing degree, and then to control the glue overflow amount to be less than or equal to 1.0mm, so that the fluidity of the prepreg substrate is reduced.

In step 2, the gelation time was 185S, and the gel content was 60% so that the fluidity was 30% or less.

The resin composition of the prepreg substrate is a resin composition of an epoxy resin system and a low thermal expansion coefficient system; the resin composition of the resin layer is an epoxy resin system, a high heat resistance system and a low thermal expansion coefficient system.

The manufactured prepreg is cut and detected, and the warp and weft directions of the prepreg need to be noticed during shearing because the yarn strands of the glass fiber cloth in the warp and weft unit lengths are different, and the warp direction (the curling direction of the glass fiber cloth) is the short edge direction of the production plate, so that the plate is prevented from being distorted and deformed after being heated.

The steps of manufacturing the prepreg with low double-sided fluidity are as follows:

step 1, removing a release film of the prepared single-side low-flow-glue prepreg;

step 2, mounting a release film on one surface of the single-sided low-flow-glue prepreg, which is coated with the resin layer, through rolling for protection;

and 3, coating a resin layer with the thickness of 20 microns on one surface of the single-sided low-flow-glue prepreg, which is not coated with the resin layer, on a coating machine, then baking for 2min in an oven at the temperature of 300 ℃, and drying to obtain the double-sided low-flow-glue prepreg.

Example two

Comprises the following steps:

step 1, preparing materials, selecting a resin composition, a release film and a substrate filler;

step 2, manufacturing a prepreg substrate, namely placing the resin composition into a gluing machine, then soaking the resin composition into a base material filler through the gluing machine, and then carrying out heat treatment to improve the semi-curing degree of the prepreg substrate and accurately control the glue overflow amount to obtain the prepreg substrate with low fluidity;

step 3, preparation before curing, namely mounting the release film on one surface of the semi-cured substrate in a rolling mode, so that the surface of the semi-cured substrate is protected;

and 4, carrying out curing molding, coating a resin layer with the thickness of 10-20 microns on the other side of the prepreg substrate protected by the release film through a coating machine, then baking for 2-5min in an oven at the temperature of 150-300 ℃, and drying to obtain the prepreg with low single-side fluidity, wherein the prepreg is dyed by adopting a disperse dye which is low in temperature, the aliphatic amine accelerator is used for improving the color depth, and the substrate filler is glass fiber cloth.

The heat treatment in the step 2 is to bake in an oven at the temperature of 150 ℃ for 10min to improve the semi-curing degree, and then to control the glue overflow amount to be less than or equal to 1.0mm, so that the fluidity of the prepreg substrate is reduced.

In step 2, the gelation time was 185S, and the gel content was 45% so that the fluidity was 30% or less.

The resin composition of the prepreg substrate is a resin composition of an epoxy resin system and a low thermal expansion coefficient system; the resin composition of the resin layer is an epoxy resin system, a high heat resistance system and a low thermal expansion coefficient system.

The manufactured prepreg is cut and detected, and the number of strands of the glass fiber cloth in unit length of warp direction and weft direction is different, so that the warp direction and weft direction of the prepreg need to be noticed during shearing, the warp direction and weft direction are selected, the warp direction (the curling direction of the glass fiber cloth) is the short side direction of the production plate, and the weft direction is the long side direction of the production plate, so that the flatness of the plate surface is ensured, and the plate is prevented from being distorted and deformed after being heated.

The steps of manufacturing the prepreg with low double-sided fluidity are as follows:

step 1, removing a release film of the prepared single-side low-flow-glue prepreg;

step 2, mounting a release film on one surface of the single-sided low-flow-glue prepreg, which is coated with the resin layer, through rolling for protection;

and 3, coating a resin layer with the thickness of 10 mu m on one surface of the single-sided low-flow-glue prepreg, which is not coated with the resin layer, on a coating machine, then baking for 5min in an oven at the temperature of 150 ℃, and drying to obtain the double-sided low-flow-glue prepreg.

EXAMPLE III

Comprises the following steps:

step 1, preparing materials, selecting a resin composition, a release film and a substrate filler;

step 2, manufacturing a prepreg substrate, namely placing the resin composition into a gluing machine, then soaking the resin composition into a base material filler through the gluing machine, and then carrying out heat treatment to improve the semi-curing degree of the prepreg substrate and accurately control the glue overflow amount to obtain the prepreg substrate with low fluidity;

step 3, preparation before curing, namely mounting the release film on one surface of the semi-cured substrate in a rolling mode, so that the surface of the semi-cured substrate is protected;

and 4, curing and forming, namely coating a resin layer with the thickness of 10-20 microns on the other side of the prepreg substrate protected by the release film through a coating machine, then baking for 2-5min in an oven with the temperature of 150-300 ℃, and drying to obtain the prepreg with low single-side fluidity, wherein the prepreg is mainly dyed by adopting disperse dyes, the dyes can be divided into low-temperature types, accelerators can be used, the color depth can be increased by using aliphatic amine accelerators, and the base material filler is selected from glass fiber cloth.

The heat treatment in step 2 is to bake in an oven at 175 ℃ for 8min to improve the semi-curing degree, and then to control the glue overflow amount to be less than or equal to 1.0mm, so that the fluidity of the prepreg substrate is reduced.

In step 2, the gelation time was controlled to 175S, and the gel content was controlled to 53% so that the fluidity was 30% or less.

The resin composition of the prepreg substrate is a resin composition of an epoxy resin system and a low thermal expansion coefficient system; the resin composition of the resin layer is an epoxy resin system, a high heat resistance system and a low thermal expansion coefficient system.

The manufactured prepreg is cut and detected, and the warp and weft directions of the prepreg need to be noticed during shearing because the yarn strands of the glass fiber cloth in the warp and weft unit lengths are different, and the warp direction (the curling direction of the glass fiber cloth) is the short edge direction of the production plate, so that the plate is prevented from being distorted and deformed after being heated.

The steps of manufacturing the prepreg with low double-sided fluidity are as follows:

step 1, removing a release film of the prepared single-side low-flow-glue prepreg;

step 2, mounting a release film on one surface of the single-sided low-flow-glue prepreg, which is coated with the resin layer, through rolling for protection;

and 3, coating a resin layer with the thickness of 15 mu m on one surface of the single-sided low-flow-glue prepreg, which is not coated with the resin layer, on a coating machine, then baking in an oven at the temperature of 225 ℃ for 3.5min, and drying to obtain the double-sided low-flow-glue prepreg.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention.