阅读说明：本技术 一种用于碳纤维布基复合材料生产的离型纸及其制备方法 (Release paper for carbon fiber cloth-based composite material production and preparation method thereof ) 是由 黄智聪 于 2021-01-21 设计创作，主要内容包括：本发明公开了一种用于碳纤维布基复合材料生产的离型纸及其制备方法,包括：原纸基材层、无溶剂型离型剂层、热塑型树脂层,所述原纸基材层上设有无溶剂型离型剂层,所述无溶剂型离型剂层上设有热塑型树脂层,所述无溶剂型离型剂层由包括以下原料比例制成：90-100份耐高温合成树脂、0.005-0.01份白油以及0.005-0.01份剥离剂,所述热塑型树脂层由热塑性树脂粉末和环氧树脂的质量比为20：80-10：90。本发明用于碳纤维布生产的离型纸,当配合热融成型机使用时,先剥离涂覆于该无溶剂型离型剂层表面的热塑型树脂层与碳纤维布迭融合,在热压下形成碳纤维布基复合材料,该离型纸结构简单,易于加工成型,剥离强度、耐高温性能、收缩率等综合性能优良,提高离型纸的使用率,从而降低生产成本。(The invention discloses release paper for producing carbon fiber cloth-based composite materials and a preparation method thereof, wherein the release paper comprises the following steps: the base paper comprises a base paper base material layer, a solvent-free type release agent layer and a thermoplastic resin layer, wherein the solvent-free type release agent layer is arranged on the base paper base material layer, the thermoplastic resin layer is arranged on the solvent-free type release agent layer, and the solvent-free type release agent layer is prepared from the following raw materials in proportion: 90-100 parts of high-temperature-resistant synthetic resin, 0.005-0.01 part of white oil and 0.005-0.01 part of stripping agent, wherein the thermoplastic resin layer is prepared by mixing thermoplastic resin powder and epoxy resin in a mass ratio of 20: 80-10: 90. when the release paper for producing the carbon fiber cloth is used together with a hot-melt forming machine, the thermoplastic resin layer coated on the surface of the solvent-free release agent layer is firstly peeled off and is overlapped and fused with the carbon fiber cloth, and the carbon fiber cloth-based composite material is formed under hot pressing.)

1. A release paper for producing carbon fiber cloth-based composite material and a preparation method thereof are characterized by comprising the following steps: the base paper comprises a base paper base material layer, a solvent-free type release agent layer and a thermoplastic resin layer, wherein the solvent-free type release agent layer is arranged on the base paper base material layer, the thermoplastic resin layer is arranged on the solvent-free type release agent layer, and the solvent-free type release agent layer is prepared from the following raw materials in proportion: 90-100 parts of high-temperature-resistant synthetic resin, 0.005-0.01 part of white oil and 0.005-0.01 part of stripping agent, wherein the thermoplastic resin layer is prepared by mixing thermoplastic resin powder and epoxy resin in a mass ratio of 30: 70-10: 90.

2. the release paper for producing carbon fiber cloth-based composite material as claimed in claim 1, wherein the solvent-free release agent layer is prepared by uniformly mixing at a temperature of 260-300 ℃.

3. The release paper for producing the carbon fiber cloth-based composite material according to claim 1, wherein the epoxy resin is one or more of bisphenol A epoxy resin and bisphenol F epoxy resin.

4. The release paper for producing carbon fiber cloth-based composite material according to claim 1, wherein the thermoplastic resin powder of the thermoplastic resin layer is dissolved in the epoxy resin under heating, and specifically comprises any one or combination of polyethersulfone or polyetherimide.

5. The release paper for producing carbon fiber cloth-based composite material according to claim 1, wherein the temperature of the coating film of the thermoplastic resin layer is controlled to be 80-100 ℃, and the surface density is 20-90g/m²。

6. The preparation method of the release paper for producing the carbon fiber cloth-based composite material according to the claims 1 to 5 is characterized by comprising the following steps:

s1 preparation of dry base paper: carrying out vacuum drying on the base paper to obtain dry base paper;

s2 surface treatment of dry base paper: carrying out surface sanding treatment on the dried base paper by using a sanding machine to obtain pretreated base paper;

s3, uniformly mixing high-temperature resin, white oil and a stripping agent at a certain temperature to obtain a mixture, and laminating the surface of the pretreated base paper to obtain solvent-free release agent laminated paper;

s4, mixing the epoxy resin and the thermoplastic resin powder under the heating condition to obtain an epoxy resin matrix, wherein the mixing temperature is 100-130 ℃, and the mass ratio of the thermoplastic resin powder to the epoxy resin is 30: 70-10: 90, respectively;

s5, preparing a thermoplastic resin film from the epoxy resin system obtained in the step S4 on the solvent-free release agent coated paper obtained in the step S3 by using a hot-melt film coating machine to obtain release paper for producing the carbon fiber cloth-based composite material.

Technical Field

The invention relates to novel release paper, in particular to release paper for producing carbon fiber cloth-based composite materials.

Background

The release film refers to a film having a differentiated surface energy, and the release film has no stickiness or slight stickiness after contacting with a specific material under limited conditions. According to different required release film release forces, the viscosity of isolation product glue is different, the release force is correspondingly adjusted, so that the ultra-light and stable release force is achieved during stripping, the release paper is widely used for electronics, automobile foam, printing and the like, and the release paper has excellent physical and mechanical properties in a wide temperature range, can reach 120 ℃ for long-term use, and even has good creep resistance, fatigue resistance, friction resistance and dimensional stability under high temperature and high frequency, so the release paper is also used in some special industries, such as carbon fiber coating resin.

In the existing patent "CN 201120081388.4", two pieces of release paper coated with different film layers are used for producing carbon fiber or unidirectional glass fiber cloth, the production process is complex, and the production cost is also increased for the production of composite materials.

Disclosure of Invention

The invention aims to solve the technical problem of providing release paper for producing carbon fiber cloth-based composite materials and a preparation method thereof, wherein the release paper is easy to process and form, has excellent comprehensive properties such as peeling strength, high temperature resistance, shrinkage rate and the like, and reduces the utilization rate of the release paper.

In order to solve the technical problems, the technical solution of the release paper for producing the carbon fiber cloth-based composite material and the preparation method thereof provided by the invention is as follows: the method comprises the following steps: the base paper comprises a base paper base material layer, a solvent-free type release agent layer and a thermoplastic resin layer, wherein the solvent-free type release agent layer is arranged on the base paper base material layer, the thermoplastic resin layer is arranged on the solvent-free type release agent layer, and the solvent-free type release agent layer is prepared from the following raw materials in proportion: 90-100 parts of high-temperature-resistant synthetic resin, 0.005-0.01 part of white oil and 0.005-0.01 part of stripping agent, wherein the thermoplastic resin layer is prepared by mixing thermoplastic resin powder and epoxy resin in a mass ratio of 30: 70-10: 90.

preferably, the solvent-free release agent layer is prepared by uniformly mixing at the temperature of 260-300 ℃.

Preferably, the epoxy resin is one or more of bisphenol A type epoxy resin and bisphenol F type epoxy resin.

Preferably, the thermoplastic resin powder of the thermoplastic resin layer is dissolved in the epoxy resin under heating, and the thermoplastic resin powder specifically includes any one or a combination of polyethersulfone or polyetherimide.

Preferably, the temperature of the coating film of the thermoplastic resin layer is controlled to be 80 to 100 ℃ and the surface density is controlled to be 20 to 90g/m²。

Preferably, the preparation method of the release paper for producing the carbon fiber cloth-based composite material comprises the following steps:

s1 preparation of dry base paper: carrying out vacuum drying on the base paper to obtain dry base paper;

s2 surface treatment of dry base paper: carrying out surface sanding treatment on the dried base paper by using a sanding machine to obtain pretreated base paper;

s3, uniformly mixing high-temperature resin, white oil and a stripping agent at a certain temperature to obtain a mixture, and laminating the surface of the pretreated base paper to obtain solvent-free release agent laminated paper;

s4, mixing the epoxy resin and the thermoplastic resin powder under the heating condition to obtain an epoxy resin matrix, wherein the mixing temperature is 100-130 ℃, and the mass ratio of the thermoplastic resin powder to the epoxy resin is 30: 70-10: 90, respectively;

s5, preparing a thermoplastic resin film from the epoxy resin system obtained in the step S4 on the solvent-free release agent coated paper obtained in the step S3 by using a hot-melt film coating machine to obtain release paper for producing the carbon fiber cloth-based composite material.

The invention can achieve the technical effects that:

(1) according to the invention, the solvent-free type release agent layer is coated on one surface of the base paper base material layer, and the stripping agent is added into the solvent-free type release agent layer, so that the stripping effect of the release layer is improved;

(2) the thermoplastic resin layer is coated on the surface of the solvent-free release agent layer, and the resin layer can be kept in the best state after being formed, so that the uniformity is good, and the utilization rate of the release paper is greatly improved;

(3) when the release paper for producing the carbon fiber cloth-based composite material is used, the thermoplastic resin layer can be peeled off at room temperature and is kept intact under hot pressing;

(4) the release paper for producing the carbon fiber cloth-based composite material has the advantages of simple structure, easiness in processing and forming, excellent comprehensive performances such as peeling strength, high temperature resistance and shrinkage rate, and the utilization rate of the release paper is improved, so that the production cost is reduced.

Detailed Description

The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.

The test methods or test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials, unless otherwise indicated, are conventionally obtained commercially or prepared by conventional methods.

Example 1

A release paper for producing carbon fiber cloth-based composite material and a preparation method thereof comprise the following steps: base paper substrate layer, solvent-free type release agent layer, thermoplastic resin layer, including the following step:

s1 preparation of dry base paper: carrying out vacuum drying on the base paper to obtain dry base paper;

s2 surface treatment of dry base paper: carrying out surface sanding treatment on the dried base paper by using a sanding machine to obtain pretreated base paper;

s3, uniformly mixing 90 parts of high-temperature-resistant synthetic resin, 0.005 part of white oil and 0.005 part of release agent at the temperature of 260 ℃, and laminating on the surface of the pretreated base paper to obtain solvent-free release agent laminated paper;

s4, mixing epoxy resin and thermoplastic resin powder under the heating condition to obtain an epoxy resin matrix, wherein the mixing temperature is 100 ℃; wherein the mass ratio of the thermoplastic resin powder to the epoxy resin is 20: 80;

s5 preparing thermoplastic resin film from the epoxy resin system obtained in S4 on the solvent-free release agent laminated paper obtained in S3 by using a hot-melt film coating machine, wherein the coating temperature is controlled at 80 ℃, and the surface density is 50g/m²And obtaining the release paper for producing the carbon fiber cloth-based composite material.

In the preparation method, the solvent-free release agent layer is uniformly mixed at the temperature of 260 ℃.

In the above preparation method, the epoxy resin is a bisphenol a type epoxy resin.

In the above preparation method, the thermoplastic resin powder of the thermoplastic resin layer is dissolved in the epoxy resin under heating, and the polyether sulfone is used as the thermoplastic resin powder.

Example 2

A release paper for producing carbon fiber cloth-based composite material and a preparation method thereof comprise the following steps: base paper substrate layer, solvent-free type release agent layer, thermoplastic resin layer, including the following step:

s1 preparation of dry base paper: carrying out vacuum drying on the base paper to obtain dry base paper;

s2 surface treatment of dry base paper: carrying out surface sanding treatment on the dried base paper by using a sanding machine to obtain pretreated base paper;

s3, uniformly mixing 95 parts of high-temperature-resistant synthetic resin, 0.0075 parts of white oil and 0.0075 parts of a release agent at 280 ℃, and laminating on the surface of the pretreated base paper to obtain solvent-free release agent laminated paper;

s4, mixing epoxy resin and thermoplastic resin powder under the heating condition to obtain an epoxy resin matrix, wherein the mixing temperature is 115 ℃; wherein the mass ratio of the thermoplastic resin powder to the epoxy resin is 30: 70;

s5 preparing thermoplastic resin film from the epoxy resin system obtained in S4 on the solvent-free release agent laminated paper obtained in S3 by adopting a hot melt film coating machine, controlling the coating temperature at 90 ℃, and controlling the surface density at 70g/m²And obtaining the release paper for producing the carbon fiber cloth-based composite material.

In the above preparation method, the epoxy resin is a bisphenol a type epoxy resin.

In the above-mentioned production method, the thermoplastic resin powder of the thermoplastic resin layer is dissolved in the epoxy resin under heating, and the polyetherimide is used as the thermoplastic resin powder.

Example 3

A release paper for producing carbon fiber cloth-based composite material and a preparation method thereof comprise the following steps: base paper substrate layer, solvent-free type release agent layer, thermoplastic resin layer, including the following step:

s1 preparation of dry base paper: carrying out vacuum drying on the base paper to obtain dry base paper;

s2 surface treatment of dry base paper: carrying out surface sanding treatment on the dried base paper by using a sanding machine to obtain pretreated base paper;

s3, uniformly mixing 100 parts of high-temperature-resistant synthetic resin, 0.01 part of white oil and 0.01 part of release agent at the temperature of 300 ℃, and laminating on the surface of the pretreated base paper to obtain solvent-free release agent laminated paper;

s4, mixing epoxy resin and thermoplastic resin powder under the heating condition to obtain an epoxy resin matrix, wherein the mixing temperature is 130 ℃; wherein the mass ratio of the thermoplastic resin powder to the epoxy resin is 10: 90, respectively;

s5 preparing thermoplastic resin film from the epoxy resin system obtained in S4 on the solvent-free release agent laminated paper obtained in S3 by adopting a hot melt film coating machine, controlling the coating temperature at 100 ℃, and controlling the surface density at 90g/m²And obtaining the release paper for producing the carbon fiber cloth-based composite material.

In the above preparation method, the epoxy resin is a bisphenol a type epoxy resin.

In the above preparation method, the thermoplastic resin powder of the thermoplastic resin layer is dissolved in the epoxy resin under heating, and the polyether sulfone is used as the thermoplastic resin powder.

The release film prepared by the invention is release paper for producing carbon fiber cloth-based composite materials, the release paper has a simple structure, is easy to process and form, has excellent comprehensive properties such as peel strength, high temperature resistance, shrinkage and the like, and improves the utilization rate of the release paper, thereby reducing the production cost.

The above detailed description is specific to one possible embodiment of the present invention, and the embodiment is not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention should be included in the technical scope of the present invention.