Application of Vacuum Assisted Forming Technology in the Construction of FRP Fishing Boat
FRP fishing boats have the advantages of good stability, resistance to wind and waves, fast speed, long life, low energy consumption and low maintenance costs. They have become the mainstream of small and medium-sized fishing boats in developed countries and regions in the world. Japanese and Korean fishing boats are less than 30 meters in length. The glass tempering rate has reached more than 95%, while my country's fiberglass fishing boats account for less than 5%. The development of fiberglass fishing boats is extremely out of proportion to the rapid rise of my country's national economy.
The "Thirteenth Five-Year Plan for the Development of National Fisheries" clearly stated that it is necessary to speed up the renewal and transformation of fishing boats, aiming at safety, energy saving, economy, environmental protection, and livability, and gradually eliminate old, wooden, energy-intensive and polluting ones. Fishing boats, build selective, energy-efficient, safe and environmentally friendly fishing boats. With the vigorous publicity and encouragement of the state, the masses of fishermen gradually accepted this new material fishing boat, and the FRP fishing boat industry was booming. Due to the late start of my country's FRP fishing boats, the design and manufacturing technology of FRP fishing boats is relatively backward. In particular, the construction and molding process of FRP fishing boats basically uses traditional manual paste. This is because the hull is large in size and complex in shape, and the general mechanical molding process is not large. Easy to use, hand lay-up has its traditional and special characteristics. However, with the current increasingly fierce competition in the FRP industry, especially the vigorous development of the FRP boat industry, the traditional hand lay-up process has also exposed more and more drawbacks and shortcomings, environmental pollution, greatly increased labor costs, and waste of raw materials. , A series of problems such as the impact of chemical raw materials on health are becoming increasingly prominent. In this context, vacuum-assisted molding technology came into being, which effectively solved various unavoidable problems in the hand lay-up process.
Vacuum assisted molding technology is a new type of composite material molding process developed in recent years. Its main features are low cost, low product porosity, environmental friendliness, uniform quality, and high fiber content. For forming large structural parts with large size, sandwich core and reinforcement at one time, vacuum assisted forming technology is an ideal process method. This process is developing rapidly in shipbuilding, wind power, aircraft, automobile and other industries.
Vacuum assisted molding technology has the following advantages:
(1) The use of vacuum can increase the ratio of glass fiber to resin and make the product fiber content higher;
(2) The vacuum helps the resin to impregnate the fiber and make the fiber impregnation more fully;
(3) The vacuum also plays the role of removing the air in the fiber bundle, so that the fiber is more fully infiltrated, thereby reducing the formation of microscopic voids, and obtaining products with lower void ratio;
(4) The forming performance of vacuum assisted forming technology is better.
Vacuum-assisted molding technology is a new type of molding technology for large glass fiber reinforced plastic parts. It removes the gas in the fiber reinforcement under a vacuum state, and at the same time, through the flow and penetration of the resin, the resin completely penetrates the glass fiber layer and the core Structure and curing at room temperature to realize the process of one-step penetration molding of the sandwich structure. This process avoids the relatively weak secondary bonding in the hand lay-up process, and also saves the complicated work caused by the secondary bonding. Since the entire molding and curing process is carried out under vacuum, a large amount of volatilization of harmful gases in the resin and a large number of small glass fiber filaments floating in the construction environment are avoided, and a large amount of labor costs and various consumables are saved. The consumption of energy has reduced the production and management costs of the enterprise.
Compared with the traditional hand lay-up process in the past, the vacuum-assisted molding technology has a short production cycle, high production efficiency, good product performance, low porosity, low environmental pollution, and high fiber content. It is obviously better than hand lay-up in many aspects.
The vacuum-assisted molding process of FRP fishing boats uses vacuum-assisted molding technology in the hull of FRP fishing boats. The main process includes preparations before the implementation of the process, vacuuming, resin injection, curing molding and demolding.