The following article comes from Huachang Polymer, author Huachang Huachang Polymer. Provides corrosion and protection solutions, polyester resin and composite material selection recommendations, and is the first to know the cutting-edge information in related fields.

The following article comes from Huachang Polymer, author Huachang

Huachang Polymer.

provides corrosion and protection solutions, polyester resin and composite material selection recommendations, and be the first to know the cutting-edge information in related fields.

Composite material liquid molding technology LCM (Liquid Composite Molding) is to inject liquid polymer into a closed mold cavity covered with fiber preforms, or heat a resin film pre-placed in the mold cavity to melt it, and the liquid polymer is flowing It is a composite material preparation technology that completes the impregnation of fibers while filling the mold, and then molds it into products through the curing process.

In terms of aviation manufacturing, composite liquid molding technology has the advantages of low design and manufacturing costs, precise part size control, high degree of operating freedom, and is suitable for integrated manufacturing of complex structures.

The main requirements for resins in liquid molding technology include:

1. has low viscosity and good fluidity, and the general viscosity is controlled at 200-300mPa. s

2. has a long enough pot life at the injection temperature, and the viscosity cannot be obvious during the filling of the mold cavity. Increase;

3. Good curing characteristics: less heat is released during curing, the curing temperature should not be too high, the time from gelation to curing and demoulding is short, improving production efficiency;

4. low volatile content, curing process No gas by-products are produced;

5. and carbon fiber have good wettability and bonding strength;

6. has a low curing shrinkage, ensuring the dimensional accuracy and surface quality of the product;

7. has excellent comprehensive properties: it has high mechanical strength Strength, modulus, toughness, temperature resistance and aging resistance, as well as meeting the technical requirements for product use.

The performance characteristics, applicable occasions and technical indicators of Huachang Polymer MERICAN 3768 liquid molding resin are as follows:

Performance characteristics:

1. single-component epoxy resin system;

2. 80℃ injection, viscosity at 80℃ 250 mPa.s;

3. resin process has a long pot life, and the viscosity does not exceed 300mPa.s after 12 hours at 80℃;

4. curing system is 180℃ 2-3h;

5. has excellent moisture and heat resistance, and vitrifies Transition temperature (Tg) 210 ℃

Application occasions:

MERICAN 3768 epoxy resin is mainly used as the matrix resin of the RTM process to make carbon fiber composite materials , which are used in aircraft elevators , front and rear edge cabins, rudders, spoilers, fairing and related load-bearing structures.

resin casting technical indicator:

Application Case:

Carbon Fiber Composite Materials to raise the rudder wall board,

is 5.5m long, and the widest point is 1.2M

Merican 3768 epoxy resin (Huachang polymer)

Fiber volume content: 55%

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