阅读说明：本技术 一种可降解碳毡预浸料及机盖内板制造工艺 (Manufacturing process of degradable carbon felt prepreg and cover inner plate ) 是由 崔国新 南江琨 白灵 刘洋 于 2019-09-20 设计创作，主要内容包括：本发明公开了一种可降解碳毡预浸料制造的工艺、一种可降解碳毡预浸料和一种应用碳毡预浸料制造复合材料汽车机盖内板的工艺,涉及汽车覆盖件技术领域,包括如下步骤：步骤一、将RAF-901树脂A组份、B组份增稠剂加入串联混合器搅拌得到环氧树脂糊,本发明使用碳毡预浸料制造工艺得到的碳毡预浸料外观均匀,脱膜性良好,不粘手,且满足汽车部件材料低VOC环保要求,使用可快速固化的碳毡预浸料作为原材料应用于复合材料汽车机盖内板的工艺上,制造成品的生产效率高、周期短、成本低、质量稳定,实现汽车轻量化和节能环保。(The invention discloses a process for manufacturing a degradable carbon felt prepreg, the degradable carbon felt prepreg and a process for manufacturing a composite material automobile cover inner plate by using the carbon felt prepreg, which relate to the technical field of automobile covering parts and comprise the following steps: the method comprises the steps of adding the RAF-901 resin A component and the B component thickener into a series mixer to be stirred to obtain the epoxy resin paste, wherein the carbon felt prepreg obtained by using the carbon felt prepreg manufacturing process has uniform appearance, good demoulding performance and no stickiness, meets the low VOC environmental protection requirement of automobile part materials, uses the rapidly-curable carbon felt prepreg as a raw material to be applied to the process of a composite material automobile cover inner plate, and has the advantages of high production efficiency, short period, low cost, stable quality and realization of light weight, energy conservation and environmental protection of an automobile.)

1. A degradable carbon felt prepreg manufacturing process is characterized by comprising the following steps:

step one, adding a RAF-901 resin A component into a series mixer with 900-1200 turns;

step two, adding the component B thickener into a series mixer and uniformly stirring to obtain epoxy resin paste;

cleaning an RFRT sheet machine, preparing a PP film, adding the mixed epoxy resin paste into an upper glue groove and a lower glue groove respectively, starting equipment, coating the epoxy resin paste on the inner surfaces of the upper PP film and the lower PP film, and compounding the epoxy resin paste with the chopped carbon fiber felt;

pressurizing, impregnating resin into the carbon fiber felt, and then folding and boxing the carbon fiber felt prepreg impregnated with the resin;

and fifthly, putting the prepared carbon fiber felt prepreg into a drying room for thickening and curing, obtaining the carbon felt prepreg after curing, and then putting the carbon felt prepreg into a refrigeration house for storage.

2. The degradable carbon felt prepreg manufacturing process according to claim 1, characterized in that: the RAF-901 resin in the first step is degradable epoxy resin.

3. The degradable carbon felt prepreg manufacturing process according to claim 1, characterized in that: in the third step, the thickness of the epoxy resin paste coated on the inner surfaces of the upper PP film and the lower PP film is 0.35-0.6 mm, and the epoxy resin paste is shortThe surface density of the cut carbon fiber felt is 200-400 g/m²。

4. The degradable carbon felt prepreg manufacturing process according to claim 1, characterized in that: and in the fifth step, the temperature of the drying room is set to be 35-50 ℃, and curing treatment is carried out for 5-20 hours.

5. A degradable carbon felt prepreg prepared by the process of claim 1.

6. A process for manufacturing a composite material automobile engine cover inner plate by using the degradable carbon felt prepreg of claim 5, which is characterized by comprising the following steps:

drawing a carbon felt prepreg blanking drawing required for manufacturing an inner plate of an automobile cover, wherein the blanking drawing comprises a layer laying positioning hole, and cutting the carbon felt prepreg into a designed blanking shape by using an automatic blanking machine;

step two, coating release agents in the upper die and the lower die of the hydraulic machine, and preheating the dies to 130-150 ℃;

thirdly, laying the carbon felt prepreg on a mold heated to 130-150 ℃, aligning with a laying positioning pin, pressing and curing the material by adopting a hydraulic press hot pressing mode, pressing and closing the mold under the pressure of 6-10 MPa, and preserving heat and pressure for 5-20 minutes after closing the mold;

fourthly, stripping after the heat preservation and pressure maintaining time is up, demolding, and taking out the inner plate of the machine cover;

and fifthly, automatically cutting and deburring, coating, polishing and spraying paint, and finally inspecting to finish the preparation of the inner plate of the machine cover.

7. The process according to claim 6, wherein the manufacturing process of the composite material automobile cover inner plate is characterized in that: the tonnage of the hydraulic press is 3000 tons.

Technical Field

The invention relates to the technical field of automobile covering parts, in particular to a process for manufacturing a degradable carbon felt prepreg, a degradable carbon felt prepreg and a process for manufacturing an automobile cover inner plate made of a composite material by using the carbon felt prepreg.

Background

The recyclable fiber reinforced thermosetting material, RFRT for short, greatly reduces the manufacturing cost of the composite material along with the development of the automatic mass production technology of the composite material, people have further knowledge on the weight reduction effect of the composite material, the application of the composite material on automobiles also makes great progress, most of the existing automobile composite material engine covers are steel plates, aluminum plates or continuous carbon fiber composite materials, and continuous carbon fibers in the quality of the steel plates and the aluminum plates can greatly realize the weight reduction target, but still have the following defects: 1. the efficiency is low, the traditional processes such as a vacuum bag pressing process, a mould pressing process and the like mainly adopt continuous carbon fiber prepreg laying, the laying working time is long, the laying working time is different from 4h to 24h according to the complexity of products, meanwhile, the curing time is long, generally about 8h, and the production capacity requirement of tens of thousands of automobiles per year cannot be met; 2. the cost is high, the raw material in the civil field is a continuous fiber fabric prepreg, the material cost is about 120-300 yuan/kg, the manufacturing cost reaches 5-8 times of the material cost, and further the comprehensive cost of the final product is 700-1000 yuan/kg; 3. the quality is unstable, traditional combined material technology is the manual layer of laying, and moreover the car product structure is extremely complicated, lead to the combined material to lay the layer degree of difficulty and increase, special-shaped structure or corner need the snip of different modes and butt joint or overlap joint side can guarantee that the fibre is continuous, and the biggest characteristics of manual layer of laying are that stability and uniformity are poor, the snip position and butt joint or overlap joint position all can have certain difference each time, and then lead to product quality poor stability, the quality fluctuation of different batches or even same batch different parts is great, also can influence the performance and the use of product simultaneously. The automobile industry has large product batch, high quality requirement and sensitive cost, the traditional carbon fiber composite material cannot meet the enterprise requirement, the light weight of the automobile is extremely urgent, and a light weight scheme with high production efficiency, low cost and stable quality is urgently needed to improve the traditional mode.

Chinese patent application CN107745749A discloses a composite material automobile engine hood and a preparation method thereof, the composite material automobile engine hood includes: the inner plate and the outer plate are assembled by adhesive bonding; the material of this inner panel and planking all adopts carbon fiber and glass fiber to mix and weave to soak the combined material of resin heat cure, the device's advantage lies in: the manufacturing cost of the automobile engine cover can be reduced, and the automobile engine cover has the advantages of fatigue resistance, corrosion resistance, vibration reduction, insulation and the like.

Disclosure of Invention

The invention aims to provide a degradable carbon felt prepreg manufacturing process to solve the defects in the prior art.

A degradable carbon felt prepreg manufacturing process comprises the following steps:

step one, adding a RAF-901 resin A component into a series mixer with 900-1200 turns;

step two, adding the component B thickener into a series mixer and uniformly stirring to obtain epoxy resin paste;

cleaning an RFRT sheet machine, preparing a PP film, adding the mixed epoxy resin paste into an upper glue groove and a lower glue groove respectively, starting equipment, coating the epoxy resin paste on the inner surfaces of the upper PP film and the lower PP film, and compounding the epoxy resin paste with the chopped carbon fiber felt;

pressurizing, impregnating resin into the carbon fiber felt, and then rolling the carbon fiber felt impregnated with the resin by adopting a 6-10 inch air expansion shaft;

and fifthly, putting the prepared carbon fiber felt prepreg into a drying room for thickening and curing, obtaining the carbon felt prepreg after curing, and then putting the carbon felt prepreg into a refrigeration house for storage.

Preferably, in the third step, the thickness of the epoxy resin paste coated on the inner surfaces of the upper and lower PP films is 0.35 to 0.6mm, and the surface density of the chopped carbon fiber mat is 200 to 400g/m 2.

Preferably, in the fifth step, the temperature of the drying room is set to be 35-50 ℃, and the curing treatment is carried out for 5-20 hours.

The invention also provides a degradable carbon felt prepreg and a manufacturing process applying the degradable carbon felt prepreg.

The invention also provides a process for manufacturing the composite material automobile cover inner plate by using the carbon felt prepreg, which comprises the following steps:

drawing a carbon felt prepreg blanking drawing required for manufacturing an inner plate of an automobile cover, wherein the blanking drawing comprises a layer laying positioning hole, and cutting the carbon felt prepreg into a designed blanking shape by using an automatic blanking machine;

secondly, coating a release agent in an upper die and a lower die of a hydraulic machine, and preheating the dies to 130-150 ℃;

thirdly, laying the carbon felt prepreg on a mold heated to 130-150 ℃, aligning with a laying positioning pin, pressing and curing the material by adopting a hydraulic press hot pressing mode, pressing and closing the mold under the pressure of 6-10 MPa, and preserving heat and pressure for 5-20 minutes after closing the mold;

fourthly, stripping after the heat preservation and pressure maintaining time is up, demolding, and taking out the inner plate of the machine cover;

and fifthly, automatically cutting and deburring, coating, polishing and spraying paint, and finally inspecting to finish the preparation of the inner plate of the machine cover.

Preferably, the tonnage of the hydraulic press is 3000 tons.

The invention has the advantages that: the carbon felt prepreg product obtained by using the carbon felt prepreg manufacturing process has the advantages of uniform appearance, good demoulding performance and no stickiness, meets the low VOC environmental protection requirement of automobile part materials, and is applied to the process of a composite material automobile cover inner plate by using the rapidly-curable carbon felt prepreg as a raw material, so that the finished product is high in production efficiency, short in period, low in cost, stable in quality, and light in weight, energy-saving and environment-friendly to automobiles.

Drawings

Fig. 1 is a schematic view of the structure of a carbon felt prepreg according to the present invention.

FIG. 2 is a schematic diagram of the hydraulic press of the present invention for pressing and curing a sheet material by means of hot pressing.

FIG. 3 is a flow chart of the present invention for preparing a composite material automotive hood inner panel.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.