Differences in width within a FR4 board
The discussion of FR4 board epoxy plate 3mm originated in the 1930s. After the 1950s, many scientific and technical personnel began to discuss waterborne polyurethane. In the 1970s, waterborne polyurethane products were designed and marketed and gradually transformed into anionic, cationic and non-ionic waterborne polyurethane products. Anionic waterborne polyurethane resin is used in FR4 board epoxy plate 3mm.
The large molecular formula of epoxy plate composed of hard and soft chain segment determines its unique characteristics of hardness and toughness, and waterborne polyurethane with different characteristics can be obtained according to the type and composition ratio of hard and soft chain segment. Its external economic two-phase structure makes waterborne polyurethane with excellent bottom temperature demulsification, leveling and flexibility, and anti-wear, high strength, very suitable for the configuration of various high-end water-soluble wooden furniture paint, such as furniture paint and floor paint. The wood paint made of polyurethane resin has the advantages of good corrosion resistance, high fullness, bottom temperature demulsification, good flexibility, good tactility and good heat resistance and viscosity, but it is more expensive.
The refining body of single component waterborne polyurethane industrial paint is a one component mechanism, and its water-solubility key is maintained by introducing hydrophilic groups on the main chain of the polymer. It is a thermoplastic resin. High polymer relative molecular weight is very large, the process of demulsification does not produce crosslinking, which has the advantage of convenient decoration engineering. But the permeability, strength, corrosion resistance, solvent resistance and profit of one component waterborne polyurethane industrial paint are always the key problems to limit its transformation.
Each FR4 board epoxy plate raw material often has its characteristics. The specification model is different, the characteristic is also different; The chemical formula of the raw material is the same but the structure is different, so the properties are very different.
The characteristics are quite relevant. The selection of raw materials for FR4 board epoxy plate shall be different according to the provisions of commodity characteristics, and the laminates with strong physical properties shall be specified. Usually phenol and indoor formaldehyde shall be selected as raw materials, and the electrical equipment with good properties shall be used for the production of common cresol or dicresol and indoor formaldehyde. Below is a detailed overview of several common types of epoxy plates. Polyvinyl acetal gum is made by adding alcohol and urea-formaldehyde resin to polyvinyl acetal. With its strong bonding, it is suitable for bonding a variety of raw materials, such as metal materials, plastic, laminated glass, etc.
It can bond the same raw material or other two different raw materials. In the production of copper foil laminate, it is used to bond copper foil. Its advantage is that its impact properties are very good, temperature resistant, and air erosion, but the temperature resistance is not high.
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