The manufacturing process of insulation board
Insulation board is a polymer material with resin as the main component. It has fluidity under certain temperature and pressure conditions, and can be molded into a geometric shape of a certain size and keep its vested shape unchanged after forming and curing. . Resin refers to the organic polymer that usually transforms or melts when heated, has fluidity when transformed, and is solid or semi-solid or liquid at room temperature. Insulation board is the most basic and most important component of plastic as daily necessities The use of plastics has been widely known, and due to some of its special advantages, the application of plastics in industry is also very common. The characteristics of insulation board mainly include the following aspects. (1) Small density and light weight. The density of plastic is 09 ~ 2.3g / cm3, but most of them are 10149 / cm3. If the foaming process is used to produce foam plastic, the density of the plastic will be smaller, and its value can be as small as 001 ~ 05g / cm3. Having such a small density means that in the same volume, plastic products are much lighter than metal products. Therefore, to reduce the weight of industrial products, it is an important way to change metal products to plastic products. “Replace steel with plastic”. (2) The insulation board has high specific strength. The strength calculated by unit mass is called specific strength. Due to the low density of plastic, its specific strength is relatively high. If the performance of the material is evaluated according to the specific strength, the specific strength and specific rigidity of some special plastic varieties are higher than that of metal. They can be used as engineering materials instead of steel. The structure with high strength and good rigidity on the rocket and missile has zero (3) good insulation performance and low dielectric loss. There are generally no free electrons and ions inside plastic atoms, so most plastics have good insulation properties and very low dielectric loss. Plastic of insulation board is an indispensable raw material for the modern electrical industry and the electrical industry. Many plugs, sockets, switches, handles, etc. used in electrical appliances are made of plastic. (4) High chemical stability of insulation board. Production practice and scientific tests have shown that the chemical stability of most plastics is very high. They have good corrosion resistance to acids, alkalis and many chemical drugs, and can be used to make various pipes, seals and replacements. Heater, etc. 5) Good wear reduction and wear resistance. Most plastics have good wear reduction and wear resistance, they can work in water, oil or corrosive liquids, which is not comparable to metal parts.
Good shock absorption and sound insulation performance. Insulation board is an excellent material for shock absorption and sound insulation in modern industry. It can be used not only for high-speed running machinery, but also as some structural parts in automobiles. For example, some cars have begun to use carbon fiber reinforced plastics to make leaf springs. In addition, many plastics also have light transmission and thermal insulation properties, or can be electroplated, colored and welded like metals, so that insulation board products can have rich colors and various structural forms. In addition, many plastics also have special properties such as waterproof, moisture-proof, breathable, radiation-proof and transient ablation resistant. Although plastics have many of the above advantages, they still have some serious defects that have not been overcome so far, such as low absolute strength; high sensitivity to temperature, heat resistance that easy to act in sunlight, atmosphere, pressure and certain media aging, shrinkage rate fluctuation range is large, the accuracy of plastic products is not easy to control; long-term load will produce “creep” and so on. The existence of the above defects seriously affects the application range of plastics so that plastic products cannot fundamentally replace metal products in many fields. Plastic is a multi-component material with polymer as the main body and various additives added.
According to different functions, the additives used in plastics can be divided into: polymer plasticizers, stabilizers, lubricants, fillers, crosslinking agents, colorants, foaming agents and so on. The main additives in plastics and their functions are as follows (1) Polymer. The polymer is the main component in the plastic formula. It is a uniform continuous phase in the plastic product. Its function is to bond various additives into a whole, so that the product can obtain the predetermined performance. In the forming material, the polymer should be able to work with the various additives added to make the material have better forming properties. Polymers determine the type and basic properties of plastics, such as physical, chemical, mechanical, electrical, thermal and other aspects. In single-component plastics, polymers account for almost 100%; in multi-component plastics, the polymer content accounts for 30% to 90% (2) plasticizers. In order to improve the fluidity of the polymer melt in the injection molding process, it is often necessary to add some organic compounds that are compatible with the polymer and are not easily volatile. These compounds are collectively called plasticizers. After the plasticizer is added to the polymer, its molecules can be inserted between the macromolecular chains, weakening the force between the macromolecules of the polymer, resulting in a decrease in the viscosity flow temperature and glass transition temperature of the polymer, and the viscosity is also reduced , So liquidity can be improved. After the plasticizer is added to the polymer, it can also improve the elongation, impact resistance and cold resistance of the plastic, but its hardness, strength and elastic modulus have decreased. (3) Stabilizer. In order to prevent or inhibit abnormal degradation and crosslinking, it is necessary to add some substances that can stabilize its chemical properties to the polymer. These substances are called stabilizers. According to the different functions, it can be divided into heat stabilizer, antioxidant and light stabilizer. In production, the amount of stabilizer added is generally greater than 2%, and in a few cases up to 5% (4) lubricant. In order to improve the flow properties of plastics in the injection molding process and reduce or avoid the adhesion and friction of plastic melts to equipment and molds, it is often necessary to add some necessary substances to the polymer. These substances are collectively called lubricants. They can also keep the plastic surface smooth (5) filler. Fillers, also known as fillers, are usually inert to polymers. The main purpose of adding fillers to polymers is to improve the forming properties of plastics, reduce the amount of polymers in plastics, and improve certain properties of plastics.