About phenolic resin
Image Source: Shengquan Group
Phenolic resins are a large class of synthetic resins obtained by polycondensation of phenolic and aldehyde compounds.
The phenolic compounds used mainly include phenol, cresol, xylenol, mixed cresol, bisphenol A, and a mixture of one or more phenols; the aldehyde compounds used mainly include formaldehyde, furfural, acetaldehyde, polymeric formaldehyde, or a mixture of several aldehydes.
Classification of phenolic resins
According to the shape, phenolic resins can be divided into solid phenolic resins and liquid phenolic resins, in which the solid phenolic resin is a yellow, transparent, amorphous lumpy substance, and the liquid phenolic resin is a yellow or dark brown liquid. According to technical specifications, solid phenolic resin can be divided into thermoplastic phenolic resin and thermoset phenolic resin.
About phenolic resin composites
Phenolic resin composite material is a new type of composite material with phenolic resin as matrix, glass fiber, carbon fiber or paper as reinforcement material, and phenolic resin as bonding material.
Phenolic resin characteristics
The unique chemical structure of phenolic resin gives it excellent physical and chemical properties such as adhesion, heat resistance, abrasion resistance, fire resistance, acid resistance and electrical insulation. The specific conditions are as follows:< /p>
However, phenolic resin also has disadvantages such as high brittleness, high shrinkage, no alkali resistance, and easy moisture absorption. To overcome the above shortcomings, at present, domestic and foreign enterprises are mainly focused on phenolic resin modification research, such as improving the aging resistance of phenolic resins by adding aralkyl resins.
Application of phenolic resin
Phenolic resin is widely used in industry due to raw material availability, low price, convenient synthesis, and excellent physical and chemical properties. Early phenolic resins were mainly used in mass production of inexpensive molding compounds, woodworking, coatings and adhesives. With the development of technology, phenolic resin is constantly improved, and its mechanical strength, heat-resistant and fire-retardant properties are constantly improved. At present, it is also widely used in the production of fiber-reinforced plastics, friction materials. , thermal insulation materials, refractory materials and other industries.
Current situation in the phenolic resin industry
At present, the production capacity, technology level and product quality of phenolic resin in my country have advanced significantly. In 2019, the annual output of phenolic resin in my country will reach 1.371 million tons. At this stage, the production and consumption of phenolic resins in my country as a whole show a steady upward trend, and there is a shortage of high-quality phenolic resins in the market. With the rapid development of the domestic automobile, railway transportation, building energy conservation, metallurgy, consumer electronics, aerospace and other industries, phenolic resin consumption will maintain the rapid growth rate in related applications, and the domestic phenolic resin market still has a lot of room for development.
The market concentration of the phenolic resin industry in my country is low and in full competition. At the current stage, the entry threshold for the medium and low price phenolic resin market in my country is low, there are many new entrants, and the market competition is becoming increasingly fierce, while the market for phenolic resin or special phenolic resin with excellent performance has high technical barriers, and there are fewer new participants, and the situation with the excess of supply over demand continues to persist. With increased competition in the domestic phenolic resin industry and increased environmental protection supervision, small enterprises will face a liquidation situation, further increasing the market concentration of the domestic phenolic resin industry.
Trends for the future development of the phenolic resin industry
1. The study of the high performance of phenolicmole and composite materials
Relying on its excellent performance and modification space, phenolic resins have prompted domestic and foreign companies to develop high-performance, high-value-added modified phenolic resins. The phenolic resin industry generally develops in the direction of improvement and functionalization, gradually forming a multi-category small-scale production.
The main direction of modification of composites based on phenolic resins is to increase their impact strength, strength and cure rate. For example, in terms of composite materials, many new materials can be developed by combining phenolic resins with various reinforcing materials. For example, the temperature of phenolic composite materials with carbon fiber as reinforcing materials can reach 250 ° C, which is often used in the aerospace and military industries. ; also, heat-resistant products made of mineral wool and fiberglass as reinforcing materials are constantly being improved.
2. Environmentally friendly development of phenolic resin
In recent years, with the improvement of the country's environmental requirements for the chemical industry, leading companies in the industry began to focus on the research and development of green phenolic resins, such as environmentally friendly low-formaldehyde dust-free resins, phenol-replacing resins and water-soluble phenolic resins. Phenolic resin greening is one of the important development trend of phenolic resin in the future.
There are problems in the production of phenolic resins
At present, there are a large number of phenolic resin production and processing enterprises in my country, and a significant number of enterprises have low technical level and insufficient investment in environmental protection. The situation of "small, scattered and weak" enterprises in the industry does not contribute to the modernization of industry technologies, increase production efficiency, reduce energy consumption and environmental pollution, increase profitability Promotion and introduction of new products.
◾Reference Material: Shengquan Group: Shengquan Group Initial Public Offering Prospectus Letter of Intent
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