阅读说明：本技术 苯并噁嗪树脂基高功率碳晶电热板及其制备方法与应用 (Benzoxazine resin based high-power carbon crystal electric heating plate and preparation method and application thereof ) 是由 鲁在君 牟浩然 王凯 于 2020-06-17 设计创作，主要内容包括：本发明公开了一种苯并噁嗪树脂基高功率碳晶电热板及其制备方法与应用,电热板,从一侧至另一侧依次设置第一绝缘层、碳晶导电油墨层和第二绝缘层,油墨层与绝缘层之间设置有金属薄片电极；所述碳晶导电油墨层中的树脂包括苯并噁嗪树脂和改性有机硅树脂；第一绝缘层和第二绝缘层的材质均为苯并噁嗪树脂。苯并噁嗪树脂的玻璃化转变温度较高,可以减少发热层在长时间工作时的氧化速度,可以整体提高电热板的使用寿命。(The invention discloses a benzoxazine resin based high-power carbon crystal electric heating plate and a preparation method and application thereof.A first insulating layer, a carbon crystal conductive ink layer and a second insulating layer are sequentially arranged from one side to the other side of the electric heating plate, and a metal sheet electrode is arranged between the ink layer and the insulating layer; the resin in the carbon crystal conductive ink layer comprises benzoxazine resin and modified organic silicon resin; the first insulating layer and the second insulating layer are made of benzoxazine resin. The glass transition temperature of the benzoxazine resin is higher, the oxidation speed of the heating layer in long-time work can be reduced, and the service life of the electric heating plate can be integrally prolonged.)

1. A benzoxazine resin based high power carbon crystal electric heating plate is characterized in that: a first insulating layer, a carbon crystal conductive ink layer and a second insulating layer are sequentially arranged from one side to the other side, and a metal sheet electrode is arranged between the ink layer and the insulating layer;

the resin in the carbon crystal conductive ink layer comprises benzoxazine resin and modified organic silicon resin;

the first insulating layer and the second insulating layer are both made of benzoxazine resin or a mixture of benzoxazine resin, epoxy resin and bismaleimide resin.

2. The benzoxazine resin based high power carbon crystal electric heating plate according to claim 1, wherein: the mass ratio of the benzoxazine resin to the modified organic silicon resin in the carbon crystal conductive ink is 9-5: 1-5.

3. The benzoxazine resin based high power carbon crystal electric heating plate according to claim 1, wherein: the conductive filler in the carbon crystal conductive ink is a mixture of carbon black and graphene, and the mass ratio of the carbon black to the graphene is 5-7: 3-5.

4. The benzoxazine resin based high power carbon crystal electric heating plate according to claim 1, wherein: the modified organic silicon resin is organic silicon resin containing benzoxazine groups.

5. A preparation method of the benzoxazine resin based high-power carbon crystal electric heating plate as claimed in any one of claims 1 to 4, wherein the preparation method comprises the following steps: the method comprises the following steps:

mixing and ball-milling conductive filler, dispersant and solvent to obtain a composite conductive agent, and mixing and grinding the composite conductive agent, benzoxazine resin, modified organic silicon resin and auxiliary agent to obtain carbon crystal conductive ink;

printing carbon crystal conductive ink on the prepreg of the first insulating layer by screen printing, heating and curing, and then covering the prepreg of the second insulating layer on the conductive ink layer;

heating and curing again, and then carrying out post-treatment to obtain the product.

6. The method of claim 5, wherein: the solvent is a mixed solvent of acetone, DMF, ethylene glycol butyl ether acetate and deionized water, and the mass ratio of the acetone, the DMF, the ethylene glycol butyl ether acetate and the deionized water in the mixed solvent is 2-4:1.5-2.5:3-5: 1.

7. The method of claim 5, wherein: in the mixed solvent, the mass ratio of acetone, DMF, ethylene glycol monobutyl ether acetate and deionized water is 3:2:4: 1.

8. The method of claim 5, wherein: in the carbon crystal conductive ink, the mass ratio of conductive filler, dispersant, resin and solvent is 3-5: 1: 1.5-2.5: 2.5-3.5.

9. Use of a benzoxazine resin based high power carbon crystal electric heating panel according to any one of claims 1-4 in heating, including domestic residential heating, public building heating, greenhouse heating and laboratory heating.

10. A heater, characterized in that: an electric heating plate is the benzoxazine resin based high-power carbon crystal electric heating plate as claimed in any one of claims 1 to 4.

Technical Field

The invention belongs to the technical field of electric heating, and relates to a benzoxazine resin based high-power carbon crystal electric heating plate and a preparation method and application thereof.

Background

The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.

The carbon fiber electric heating plate is a novel electric heater appearing on the market in recent years, and the carbon fiber electric heating plate comprises a sandwich structure: the upper and lower layers are insulating layers, and the middle layer is a carbon paper heating layer containing carbon fiber. The working principle is that the carbon fiber can radiate far infrared rays under electrification and is heated in an irradiation mode. Compared with traditional heating equipment such as electric oil heater, little sun, air conditioner, the carbon fiber electric plate has following outstanding advantage: energy saving, health, safety, fast heating rate, etc. Therefore, it is considered to be the most reasonable, healthier and potentially most home heating means.

However, the existing carbon fiber electric heating plate on the market has the following two disadvantages:

the power is not high. Usually less than 800w (size 0.6 m × 1.0 m), which is very different from traditional electric oil heaters, small sun, air conditioners (usually more than 2000w), etc.;

and secondly, potential safety hazards exist. Carbon fibers are difficult to distribute uniformly in carbon paper, which causes the carbon paper to have an uneven resistance value. Therefore, the surface temperature of the electric heating plate is easy to cause uneven temperature, the temperature difference can reach 8-15 ℃, even under extreme conditions, the situation of overhigh local temperature can occur, the electric heating plate is easy to burn out, and potential safety hazards also exist.

Although the carbon fiber electric heating plate realizes high power (for example, the power of the carbon fiber electric heating plate in ZL201410527378.7 can reach 1100-1500W), the carbon fiber electric heating plate still has the defect of uneven heating by adopting carbon paper as a heating layer, the surface temperature difference can reach 8-15 ℃, and the carbon fiber electric heating plate is easy to warp and deform particularly when being used at high power.

In order to solve the defects, people develop a screen printing technology to prepare the electric heating plate at present. The basic principle of screen printing is: carbon fiber is replaced by ink containing carbon powder, and the basic principle that the meshes of the image-text part and the non-image-text part of the screen printing plate are ink-permeable and the meshes of the non-image-text part are ink-impermeable is utilized for printing. The specific operation is as follows: and pouring ink containing carbon powder on one end of the screen printing plate, and applying a certain pressure on the ink part on the screen printing plate by using a scraping and printing scraper blade while moving towards the other end of the screen printing plate. The ink is extruded from the meshes of the picture and text part to the benzoxazine resin/glass fiber insulating layer by the scraper in the moving process. The screen printing technology is adopted to solve the problem of uneven distribution of the carbon fibers, so that the electric heating plate with uniform heating is obtained. The carbon powder (also called carbon crystal) is adopted instead of the carbon fiber, so the electric heating plate is called as a carbon crystal electric heating plate, but the existing reported carbon crystal electric heating plates all adopt the traditional epoxy resin and are limited by the heat resistance of the epoxy resin, the power of the carbon crystal electric heating plate is less than 800W (the size is 0.6 m multiplied by 1.0 m), most of the carbon crystal electric heating plate is concentrated on 300-500W, and the problem of low power still exists.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention aims to provide a benzoxazine resin based high-power carbon crystal electric heating plate and a preparation method and application thereof.

In order to achieve the above object, one or more embodiments of the present invention disclose the following technical solutions:

in a first aspect, the invention provides a benzoxazine resin based high-power carbon crystal electric heating plate, wherein a first insulating layer, a carbon crystal conductive ink layer and a second insulating layer are sequentially arranged from one side to the other side, and a metal sheet electrode is arranged between the ink layer and the insulating layer;

the resin in the carbon crystal conductive ink layer comprises benzoxazine resin and modified organic silicon resin;

the first insulating layer and the second insulating layer are made of benzoxazine resin.

In a second aspect, a preparation method of the benzoxazine resin based high-power carbon crystal electric heating plate is provided, which comprises the following steps:

mixing and ball-milling conductive filler, dispersant and solvent to obtain a composite conductive agent, and mixing and grinding the composite conductive agent, benzoxazine resin, modified organic silicon resin and auxiliary agent to obtain carbon crystal conductive ink;

printing carbon crystal conductive ink on the prepreg of the first insulating layer by screen printing, heating and curing, and then covering the prepreg of the second insulating layer on the conductive ink layer;

heating and curing again, and then carrying out post-treatment to obtain the product.

In a third aspect, the benzoxazine resin based high power carbon crystal electric heating plate is applied to heating, wherein the heating comprises household residence heating, public building heating, greenhouse heating and experimental heating.

In a fourth aspect, a heater is provided, wherein the electric heating plate is the benzoxazine resin based high-power carbon crystal electric heating plate.

Compared with the prior art, one or more technical schemes of the invention have the following beneficial effects:

the resin in the carbon crystal conductive ink is a mixture of benzoxazine resin and modified organic silicon resin, the glass transition temperature of the benzoxazine resin is higher, the oxidation speed of the heating layer in long-time working can be reduced, and the service life of the electric heating plate can be integrally prolonged.

The benzoxazine resin is used as an insulating layer, and the carbon crystal conductive ink is used for replacing carbon paper as a heating layer by adopting a screen printing technology. The surface of the prepared electric heating plate generates heat more uniformly, and the surface temperature difference is less than 5 ℃, so that the novel high-power carbon crystal electric heating plate which generates heat uniformly, has longer service life and is safer is obtained.

The benzoxazine resin is used as an insulating layer, the conductive ink is used for replacing carbon paper by a screen printing technology to be used as an electric heating plate made of a heating layer, the power can reach 1100-1900W, compared with the traditional carbon crystal electric heating plate of 400-800W, the electric heating plate not only expands the distance of heat felt by people, but also greatly reduces the cost of the electric heating plate achieving the same heating effect.

The temperature required for generating far infrared radiation is higher, the radiation is stronger generally at more than 150 ℃, and the improved conductive ink can effectively enhance the physical therapy effect when being matched with an electric heating plate prepared from a benzoxazine insulating layer.

The electric heating plate is improved by using the benzoxazine to replace epoxy resin, so that the heat borne by the electric heating plate is increased, the power is higher, and the temperature threshold is increased.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

Fig. 1 is a schematic structural diagram of a high-power carbon crystal electric heating plate.

In the figure: 1. the conductive ink comprises a carbon crystal conductive ink layer, 2, a first insulating layer, 3, copper foil strips, 4, welding spots, 5, a lead and 6, and a second insulating layer.

Detailed Description

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The invention aims to solve the problem of uneven heating of the existing high-power carbon fiber electric heating plate caused by uneven distribution of carbon fibers in carbon paper, and improves the preparation of a carbon crystal conductive ink layer with even heating by adopting a screen printing technology and the adoption of benzoxazine and modified resin thereof as an insulating layer so as to obtain a novel carbon crystal electric heating plate with even surface temperature, high power, higher safety and longer service life.

In a first aspect, the invention provides a benzoxazine resin based high-power carbon crystal electric heating plate, wherein a first insulating layer, a carbon crystal conductive ink layer and a second insulating layer are sequentially arranged from one side to the other side, and a metal sheet electrode is arranged between the ink layer and the insulating layer;

the resin in the carbon crystal conductive ink layer comprises benzoxazine resin and modified organic silicon resin, wherein the benzoxazine resin provides heat resistance, and the modified organic silicon resin provides toughness;

the first insulating layer and the second insulating layer are both made of benzoxazine resin or a mixture of benzoxazine resin, epoxy resin and bismaleimide resin.

In some embodiments, the mass ratio of the benzoxazine resin to the modified silicone resin in the carbon crystal conductive ink is 9-5: 1-5.

In some embodiments, the conductive filler in the carbon crystal conductive ink is conductive carbon black or a mixture of conductive carbon black and graphene, the graphene is added in an amount of 0.1-20% of the total mass ratio of the mixture, and the graphene is added to improve the electrothermal conversion efficiency and the service life.

In some embodiments, the modified silicone resin is a silicone resin containing benzoxazine groups as described in ZL201110001172.7, in order to increase compatibility with benzoxazine resins.

In some embodiments, the dispersant in the carbon crystal conductive ink is modesty 9086.

In some embodiments, the first and second insulating layers are both glass cloth reinforced benzoxazine resin insulating layers.

In a second aspect, a preparation method of the benzoxazine resin based high-power carbon crystal electric heating plate is provided, which comprises the following steps:

mixing and ball-milling conductive filler, dispersant and solvent to obtain a composite conductive agent, and mixing and grinding the composite conductive agent, benzoxazine resin, modified organic silicon resin and auxiliary agent to obtain carbon crystal conductive ink;

printing carbon crystal conductive ink on the prepreg of the first insulating layer by screen printing, heating and curing, and then covering the prepreg of the second insulating layer on the conductive ink layer;

heating and curing again, and then carrying out post-treatment to obtain the product.

In some embodiments, the carbon crystal conductive ink has a mass ratio of conductive filler, dispersant, resin, and solvent of 3 to 5: 1: 1.5-2.5: 2.5-3.5.

In a third aspect, the benzoxazine resin based high power carbon crystal electric heating plate is applied to heating, wherein the heating comprises household residence heating, public building heating, greenhouse heating and experimental heating.

In a fourth aspect, a heater is provided, wherein the electric heating plate is the benzoxazine resin based high-power carbon crystal electric heating plate.