How polyester resins are produced

1.Unsaturated polyester resin is prepared by polycondensation of unsaturated diacids such as maleic anhydride or trans-maleic acid and diols such as ethylene glycol or propylene glycol.

2.This resin is dissolved in polymeric vinyl monomers such as styrene, benzene peroxide or methyl ethyl ketone peroxide is added as polymerization initiator, and amines such as dimethylaniline or cobalt naphthenate are used as activators.

3.Usually the oxygen in the air hinders the curing of the film surface and makes the coating film sticky. In order to prevent this phenomenon from occurring, a small amount of wax can be added to the coating to form a thin film on the surface of the coating film and isolate the air to promote surface curing.

Teach you to make crafts out of resin, which can release cool colors.

Resin is a natural polymer formed by a viscous substance secreted by trees and other plants. Resin is a way for trees to protect themselves, and can also be used to repair plant wounds and defend against intruding insects. Resins are usually yellow or transparent, but some types of resins can also exhibit other colors like red, blue, green, etc.

The resin is formed by the release of specific volatile substances from the plant to shield the cherry blossoms. When plants are harmed, they release these volatile substances to protect themselves. These substances dry out in the air and form resins.

When trees and other plant macroclumps continuously release these substances, resins continue to accumulate and form. The rate at which resin is formed depends on many factors such as plant species, environment, and weather conditions, among others.

In addition to acting as a defensive in plants, resins can be used for a variety of purposes. One of the most important uses of decoding is to make fossils. Certain insects and other organisms can get stuck in the resin and become trapped in the resin.

These animals would be fossilized along with the resin to form a gemstone known as amber. Amber became an important tool for studying the prehistory of insects and animals. In addition, resins can be used to make fragrances, medicines, and coatings, as well as to make high-end jewelry and crafts.

In conclusion, the formation of resins is formed by the release of specific volatile substances from plants. These substances dry in the air and form resins. As a natural polymer, resins are widely used in many fields, including the study of insect and animal prehistory, the manufacture of spices, medicines, coatings, and fine jewelry and crafts.

The chemical name of PET is polyethylene terephthalate, also known as polyester, and the chemical formula is CoC6H4Cooch2CH2O. (English: Polyethylene Terephthalate, referred to as PET), which is prepared by the exchange of dimethyl terephthalate with ethylene glycol ester or esterification of terephthalic acid and ethylene glycol, and then by polycondensation reaction.

It is a crystalline saturated polyester, which is a milky white or light yellow, highly crystalline polymer with a smooth and shiny surface. It is a common resin in life, which can be divided into APET, RPET and PETG.

PET is a milky white or light yellow polymer with a highly crystalline surface and a smooth and shiny surface. It has excellent physical and mechanical properties in a wide range of temperatures, with a long-term use temperature of up to 120, excellent electrical insulation, and even at high temperature and high frequency, its electrical properties are still good, but the corona resistance is poor, creep resistance, fatigue resistance, friction resistance, and dimensional stability are very good. PET has ester bonds, which will decompose under the action of strong acids, strong alkalis and water vapor, and is resistant to organic solvents and has good weather resistance.

The disadvantages are slow crystallization rate, difficult molding processing, high molding temperature, long production cycle, and poor impact performance. Generally, the processability and physical properties are improved by strengthening, filling, blending and other methods, and the effect of glass fiber reinforcement is obvious, and the rigidity, heat resistance, chemical resistance, electrical properties and weather resistance of Shuqiao spring fat are improved. However, it is still necessary to improve the disadvantages of slow crystallization, and the addition of nucleating agents and crystallization promoters can be adopted.

The addition of flame retardants and flame retardant drippers can improve the flame retardancy and self-extinguishing properties of PET.

Second, the resin performance.

PET is a milky white or pre-yellow highly crystalline polymer with a smooth and shiny surface. Creep resistance, fatigue resistance, abrasion resistance and dimensional stability, low wear and high hardness, with the largest toughness among thermoplastics: good electrical insulation performance, low dissipation by temperature shadows, but poor corona resistance.

Non-toxic, weather-resistant, chemical-resistant, good stability, low water absorption, weak acid and organic solvent resistance, but not resistant to hot water immersion, not alkali resistant.

PET resin has a high glass transition temperature, slow crystallization speed, long molding cycle, long molding cycle, large molding shrinkage, poor dimensional stability, and crystallized molding is brittle and low heat resistance.

Teach you to make crafts out of resin, which can release cool colors.