Composite resin and fiber molding is very sticky to the mold, what is the best release agent to use?

The glass fiber epoxy resin composite materials you are talking about generally refer to glass fiber reinforced plastics, commonly known as glass fiber reinforced plastic, abbreviated as FRP or GRP in English, if I understand that there is no problem, then it is like this, glass fiber is the reinforcing material in this composite material, and epoxy resin is the matrix material of this composite material, then in the curing process, it is the matrix material The resin is transformed from a liquid state to a solid state after a chemical reaction, and the heat of chemical reaction is released in this reaction process, Then there is still a certain amount of non-solid resin after the reaction is completed, so it is necessary to carry out post-heat treatment to increase the solid content. The curing temperature you are talking about should be the temperature during the reaction, and the glass transition temperature is that after the reaction is completed, the resin has formed a solid state, and then it is heated to change both its strength and performance, especially the strength loss is very large. Then the glass transition temperature refers to the temperature at which the resin reaches the molten state of the glass after being heated in a completely solid state.

It should be said that the curing temperature is a chemical indicator, while the glass transition temperature is a physical indicator, and they are not the same concept. At room temperature, the matrix of glass fiber resin composite materials is completely solid, not glassy, otherwise there will be no strength mechanically!

Semi-permanent release agent.

Scope of application of release agent:

1. FRP mold or steel mold in good condition.

2. Mold with non-slip surface or complex structure.

3. Products that require continuous production, large product area, and high quality requirements.

Release agent operation method:

1. Use a cotton rag to apply the release agent to the surface of the module in a small area.

2. Apply a thin layer using the same cross-smearing method, being careful not to wipe it off.

3. Carefully and thoroughly apply a layer to the entire mold surface.

4. There should be no less than 15min curing time before coating the next layer.

5. Apply the second layer in the same way. For new molds using the release agent for the first time, it is recommended to treat no less than 4 layers of release agent. If necessary, it can be increased or decreased in 2 layers.

6. Some parts with poor surface conditions can be coated with release agent locally.

7. After the release agent is treated, at least 30min interval before spraying gel coat or using mold.

After single or multiple demoulding, when it is necessary to recoat, apply a layer with the same cross-coating method, wait for 30min, and then continue to use.

Composites are a mixture.

Composite materials are divided into metal-to-metal composites, non-metal-to-metal composites, and non-metallic and non-metallic composites according to their composition. According to its structural characteristics, it is divided into:

Fiber-reinforced composites. It is composed of various fiber reinforcements placed in the matrix material. Such as fiber-reinforced plastics, fiber-reinforced metals, etc.

Sandwich composites. It is composed of a combination of surface materials and core materials with different properties. Usually the surface material is strong and thin; The core material is light and has low strength, but it has a certain stiffness and thickness. It is divided into two types: solid interlayer and honeycomb interlayer.

Fine-grained composites. Hard fine particles are evenly distributed in the matrix, such as dispersion strengthened alloys, cermets, etc.

Hybrid composites. It is composed of two or more reinforcing phase materials mixed in one matrix phase material. Compared with ordinary single-reinforcing phase composites, its impact strength, fatigue strength and fracture toughness are significantly improved, and it has special thermal expansion properties.

It is divided into intralayer hybrid, interlayer hybrid, sandwich hybrid, intra-layer interlayer hybrid and super-hybrid composite materials.

Composite materials can be divided into two categories: structural composite materials and functional composite materials.

Structural composite materials are materials used as load-bearing structures, which are basically composed of reinforcement components that can bear loads and matrix components that can connect reinforcements to become an integral material and play a role in transmitting force. Reinforcements include glass, ceramics, carbon, polymers, metals, as well as natural fibers, fabrics, whiskers, sheets, and granules, while substrates include polymers (resins), metals, ceramics, glass, carbon, and cement. A wide variety of structural composites can be composed of different reinforcing bodies and different matrices, and are named after the matrices used, such as polymer (resin) matrix composites.

The characteristics of structural composite materials are that the component material selection design can be carried out according to the requirements of the force of the material in use, and more importantly, the composite structure design can also be carried out, that is, the reinforcement layout design, which can reasonably meet the needs and save materials.

Functional composite materials are generally composed of functional body components and matrix components, and the matrix not only plays the role of constituting the whole, but also can produce synergistic or enhanced functions. Functional composites refer to composites that provide physical properties in addition to mechanical properties. Such as:

Conductive, superconducting, semi-conductive, magnetic, piezoelectric, damping, wave absorption, wave transmission, friction, shielding, flame retardant, heat protection, sound absorption, heat insulation, etc. Collectively referred to as functional composites. Functional composites are mainly composed of functional bodies, reinforcements and matrices.

Functional bodies can be composed of one or more functional materials. Multifunctional composites can have a variety of functions. At the same time, there is also the possibility of new functions being created due to compounding effects.

Multifunctional composites are the development direction of functional composites.

As an important part of the development of high-tech industries, resin matrix composite special paper products occupy an important position in China's relevant scientific and technological plans.

Of course, there is a difference, the difference in words is so big, bag pressing, is to use vacuum bags to assist molding, hot pressing is the heating and curing process, molding is the sheet or group molding compound clamping process.