In various molding processes of composite materials in China, the molding method only accounts for about 10%. It is expected that by 2010, the market share of molding method can increase to 25%, and the FRP production can reach 90-100 tons. The reason why the molding method can be carried out agilely is mainly due to the rapid development of SMC and BMC/DMC in recent years.

1. What is composite data? What is the connection between composite materials and fiberglass?

A solid product composed of two or more independent physical phases, including a bonding material (matrix) and granules, fibers, or flakes, is called a composite material. The simplest composite material is the "mud" with straw added for building adobe houses in rural areas. The soil serves as a binder, while the straw serves as a reinforcing material. It can be seen that composite materials never deviate from their roots. It consists of two parts, one is the matrix (system), and the other is the reinforcement material.

Composite materials can be divided into three categories based on different matrix materials:

(1) Polymer based composite materials;

(2) Metal based composite materials;

(3) Inorganic non-metallic composite materials; Such as ceramic based composite materials; Inorganic fiberglass, etc. Among them, polymer based composite materials account for over 90% of all composite materials.

Fiberglass belongs to polymer based composite materials, and in polymer based composite materials, the amount of fiberglass accounts for more than 90% of its total amount.

2. What is fiberglass reinforced plastic? What are the characteristics of fiberglass reinforced plastic?

Fiberglass reinforced plastic, also known as fiberglass reinforced plastic, is neither glass nor steel. It was first proposed by former Minister of Building Materials, Lai Jifa, in the late 1950s and has gradually been recognized by international industry professionals, especially in the Chinese community.

Fiberglass reinforced plastic (FRP) is an abbreviation for Moin glass fiber reinforced plastics.

Fiberglass started in the 1940s, and China has been engaged in research and development since 1958. It has now been widely used in various fields of the national economy. Is FRP available

Less outstanding features:

(1) Lightweight and high-strength, with a specific gravity between 1.5 and 2.0, as long as it is 1/4 to 1/5 of carbon steel, its tensile strength is close to that of carbon steel, even surpassing it. The strength (the value of data strength divided by density) can be compared with high-grade alloy steel. Therefore, it has significant advantages in the application of high-pressure vessels such as aviation, rockets, world aircraft, and other products that require weight reduction.

(2) Chemical corrosion resistance: FRP is a good corrosion resistant material that has good resistance to general concentrations of acids, alkalis, salts, various oils and organic solvents, as well as seawater. It has been widely applied in multiple fields of chemical anti-corrosion and has achieved significant economic benefits. Replacing carbon steel, stainless steel, wood, non-ferrous metals, etc.

(3) Good electrical function: FRP has high insulation function (surface resistance, volume resistance, breakdown voltage, etc.), and can be made into anti-static or conductive materials. It can maintain good dielectric function at high frequencies, is not affected by electromagnetic effects, does not reflect electromagnetic waves, and can pass through microwaves.

(4) Resistance to instantaneous ultra-high temperature: Some FRP materials can withstand instantaneous ultra-high temperatures above 3800 ℃, making them the only choice for ablative materials such as rocket shells, cones, nozzles, etc. China started developing FRP in order to develop "two bombs and one satellite" (atomic bomb, hydrogen bomb, artificial satellite). FRP has a low thermal conductivity, ranging from 0.3 to 0.4 kcal/m · h · degree at room temperature. As long as it is 1/100 to 1/1000 of that of metal, it is an excellent insulation material.

(5) No notch sensitivity: Fiber composite materials contain a large number of independent fibers, ranging from a few thousand to tens of thousands per square centimeter. From a mechanical perspective, it is a typical statically indeterminate system that does not exhibit "notch sensitivity" (rapid expansion upon damage) like glass and metal. Even if a few fibers break due to overloading, the load will be quickly redistributed to undamaged fibers. Therefore, FRP is suitable for making components with high requirements, such as aircraft wheels, helicopter rotors, tank wheels, helmets, etc.

(6) Good anti fatigue function: Fatigue damage is a low stress damage caused by the formation and propagation of micro cracks in data under alternating loads.

(7) We can produce transparent and multi colored products.

(8) Strong adaptability in planning and superior molding process characteristics: FRP is both a material and a structure, and can satisfy the different requirements of different products to the greatest extent through the selection of different materials and molding processes.

Any product is divided into two parts, FRP is not omnipotent, and it also has its shortcomings:

(1) The elastic modulus is low. FRP has an elastic modulus twice that of wood but 10 times smaller than steel, so it often lacks rigidity and is prone to deformation in product structures. It can be made into thin shell structures, sandwich structures, or by incorporating high modulus carbon fibers to improve the rigidity of FRP.

(2) Long term heat resistance is low, and it can generally only be used for a long time below 100 ℃. However, by using high-performance resins, this temperature can be raised to 200-300 ℃.

(3) Aging phenomenon exists: anti-aging agents can be added, and surface coating can be improved.

(4) Poor abrasion resistance: can be improved by adding wear-resistant materials, such as silicon carbide

Note: Our company's fiberglass products and semi-finished products:

1. SMC combined water tank; 2. SMC insulation board; 3. Other SMC components (such as meter box, long angle material, short angle material, arc plate, power connector, insulation sleeve, etc.); 4. Various phenolic and epoxy phenolic glass cloth insulation boards; 5. Various phenolic and epoxy phenolic glass cloth tubes and rods; 6. Molded materials, SMC materials, BMC/DMC.

Article source: SMC molded products http://www.jmlicheng.com/