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Hand Lay Up FRP Process

Jun 13, 2020

Hand lay-up FRP process 1. Definition and process flow of hand lay-up process   Hand lay-up forming is also called contact forming. It is a process method of spreading and molding on the mold with fiber reinforced materials and resin glue, curing at room temperature (or heating), without pressure (or pressurization), and demolding. The main process is two. The advantages of hand lay-up molding process 1. The mold cost is low and easy to maintain;    2. The production preparation time is short, the operation is simple, easy to understand and easy to learn;    3. Not subject to the restrictions of product size and shape;    4. According to The design requirements of the product can be arbitrarily reinforced in different parts, with great flexibility;   5, room temperature curing, atmospheric pressure molding;   6, color gel coat layer can be added to obtain a colorful and smooth surface effect;   7, resin matrix and reinforcing materials It can be optimized and combined with other materials (such as foam, balsa wood, honeycomb, metal, etc.) to form products. 3. Explanation of terms    1. Gel coat: a special resin sprayed on the surface of the product to improve the surface quality of the product.   2. Reinforcement materials (ie chopped mat, glass fiber cloth, etc.): In composite materials, all substances that can enhance the mechanical properties of the matrix are collectively referred to as reinforcement materials. Such as glass fiber in FRP, carbon fiber in carbon fiber composite materials.   3. Matrix material (that is, resin paste): the binder used in the composite material to bond the reinforcing material, the main role is to bond the fiber, protect the fiber, and transfer stress.   4. Filler: In order to reduce costs and improve some properties of the resin, some auxiliary materials are added to the resin; in order not to "flow glue" the resin, some active SiO2 fillers added to the resin are also called thixotropic agents.   5. Pigment paste: In order to make the FRP color beautiful, some inorganic pigments are added to the resin. 6. Thinner: an auxiliary agent added to reduce the viscosity of the resin paste, the thinner is divided into active diluent (participating in the curing reaction, such as styrene) and non-reactive diluent (only plays a role in reducing the viscosity, does not participate in the curing reaction) .   7. Curing agent: a substance or mixture that promotes or controls the rate of curing reaction.   8. Accelerator: A substance with a small amount used in combination with a curing agent to increase the reaction rate.   9. Release agent: a substance attached to the molding surface of the mold to separate the product from the mold