Conformal coating based on butadiene styrene rubber as well as preparation method and use method thereof

Abstract

The invention discloses a conformal coating based on butadiene styrene rubber, and a preparation method and a use method thereof, the conformal coating comprises styrene-butadiene rubber, organosiloxane, a diluent and a dispersant, the mass of the styrene-butadiene rubber accounts for 0.01-30% of the total mass of the conformal coating, and the mass of the organosiloxane accounts for 0.01-10% of the total mass of the conformal coating. According to the conformal coating disclosed by the invention, the styrene-butadiene rubber is used as base resin of the conformal coating, the organosiloxane is creatively added into the styrene-butadiene rubber, meanwhile, the ratio of the styrene-butadiene rubber to the organosiloxane is reasonably set, and the styrene-butadiene rubber and the organosiloxane are mutually matched and have a synergistic effect; the styrene-butadiene rubber and the circuit board base material form a strong anchoring effect, a high-solid low-viscosity system is formed while the adhesive force of a cured paint film is increased and the protective performance of the paint film is optimized, the construction performance of the whole conformal coating is improved, repeated spraying for meeting the thickness requirement is avoided, special high-grade raw materials and equipment are not needed, and the cost is low.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a styrene-butadiene rubber-based conformal paint and a preparation method and application method thereof. Background technique [0002] Three-proof paint, that is, paint with protective functions such as moisture-proof, mildew-proof, and salt spray. Conformal paint is an advanced material with a special formula, which is usually coated on the surface of printed circuit boards and related discrete devices and integrated circuits. After curing, it forms a transparent protective film, which can effectively isolate circuit boards and protect circuits. The board and its related equipment are protected from the environment. It can provide superior protection for circuit boards under conditions such as chemical substances, vibration, moisture, vulcanization, salt spray, humidity, high temperature, and low temperature, and improve reliability and safety factor. Conformal coatings are increasing...

AI Technical Summary

Problems solved by technology

Parylene conformal coatings are mostly formed by plasma spraying, which has good protective performance, but the requirements for equipment and raw materials are extremely high, and they are relatively expensive; polyurethane conformal coatings have poor yellowing resistance, and aging and stickiness problems exist in high-temperature and high-humidity environments; The price of raw materials for resin conformal paint is high, and its light aging resistance is poor; the flexibility of epoxy resin conformal paint is poor, the shrinkage rate is high, and rework is difficult; the synthetic rubber conformal paint needs to be volatilized by solvent to form a film on the surface of the circuit board, It has good protective performance, but its adhesion to the substrate is extremely poor. In addition, because it relies on the volatilization of macromolecular polymer solvents to form a film, the resin molecular chains are entangled, and the viscosity is high. It is difficult to achieve high solid content products, and repeated spraying is required for production. It can only meet the requirements of thick coating, but the construction performance is not good; the silicone conformal coating has excellent electrical protection performance and weather resistance, but the storage period of the silicone conformal coating is very short after opening, the viscosity is high, and the spray gun is easy to block when spraying. Problems such as long dry time and relatively expensive

[0004] However, in the process of realizing the embodiment of the present application, the inventors of the present application found that the above-mentioned technology has at least the following technical problems: the existing three-proof paint often uses a single type of base resin, and it is difficult to take into account good construction performance and low cost at the same time and excellent protection

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