Abrégé

The present disclosure relates to a solvent-free moisture curing silicone conformal coating used for the surface protection of circuit boards in the electrical and electronic industries and a preparation method thereof. The solvent-free moisture curing silicone conformal coating comprises (A) a hydrolyzable functional group-terminated linear polysiloxane (I); (B) a hydrolyzable functional group-containing silicone resin with a three-dimensional structure (II); (C) a hydrolyzable functional group-containing crosslinking agent; (D) a catalyst; (E) an adhesion promoter. The solvent-free conformal coating of the present disclosure has low viscosity, high strength and good toughness, and can meet the traditional coating process such as spraying, brushing, dipping, etc., while satisfying the surface protection of the circuit board. Compared with the traditional solvent-based silicon conformal coating, the solvent-free silicon conformal coating can be cured by moisture, the VOC content released during the curing process is low, and the harm to the environment and occupational health is small.

Classes IPC  ?

• C09J 183/08 - Polysiloxanes contenant du silicium lié à des groupes organiques contenant des atomes autres que le carbone, l'hydrogène et l'oxygène
• C08G 77/18 - Polysiloxanes contenant du silicium lié à des groupes contenant de l'oxygène à des groupes alcoxyle ou aryloxyle
• C08G 77/26 - Polysiloxanes contenant du silicium lié à des groupes organiques contenant des atomes autres que le carbone, l'hydrogène et l'oxygène groupes contenant de l'azote
• C08G 77/388 - Polysiloxanes modifiés par post-traitement chimique contenant des atomes autres que le carbone, l'hydrogène, l'oxygène ou le silicium contenant de l'azote
• C08G 77/08 - Procédés de préparation caractérisés par les catalyseurs utilisés
• C08K 5/544 - Composés contenant du silicium contenant de l'azote
• C09J 183/06 - Polysiloxanes contenant du silicium lié à des groupes contenant de l'oxygène
• C09J 11/06 - Additifs non macromoléculaires organiques

Abrégé

The present invention relates to a solvent-free moisture curing organosilicon coated coating for circuit board surface protection and a preparation method therefor in the electronic and electrical appliances industries. The organosilicon coated coating comprises: (A) a hydrolytic functional group-terminated linear polysiloxane (I); (B) a hydrolytic functional group-containing organosilicon resin (II) of a body-type structure; (C) a hydrolytic functional group-containing crosslinking agent; (D) a catalyst; and (E) an adhesion promoter. The solvent-free coated coating has a low viscosity, a high strength and a good toughness, and can satisfy traditional coating processes such as spray-coating, brush-coating and dip-coating, while also satisfying the need for circuit board surface protection. Compared with traditional solvent organosilicon coated coatings, the solvent-free organosilicon coated coating can be cured using moisture, and has a low VOC content which is released during curing, which is less harmful to the environment and occupational health.

Classes IPC  ?

• C09D 183/04 - Polysiloxanes
• C09D 7/63 - Adjuvants non macromoléculaires organiques
• C08G 77/38 - Polysiloxanes modifiés par post-traitement chimique
• C08G 77/26 - Polysiloxanes contenant du silicium lié à des groupes organiques contenant des atomes autres que le carbone, l'hydrogène et l'oxygène groupes contenant de l'azote
• C08G 77/06 - Procédés de préparation

Abrégé

A weather resistant matte silicone coating special for EMAS, comprising: 80˜130 parts by weight of α,ω-dihydroxypolydimethylsiloxane; 0.5˜10 parts by weight of a linear polydimethylsiloxane with terminal hydroxyl group; 1˜10 parts by weight of fumed silica; 10˜50 parts by weight of precipitated silica; 1˜5 parts by weight of color masterbatch; 0.9˜5 parts by weight of organotin chelate catalyst; crosslinking agent, comprising 1.5˜7 parts by weight of methyltri(methylethylketoximino)silane, 1.5˜7 parts by weight of vinyltri(methylethylketoximino)silane, and 1˜7 parts by weight of aminopropyltriethoxysilane; 1.5˜6 parts by weight of delustering agent; and 250˜350 parts by weight of a solvent. The coating has the properties of low viscosity, high flow, relatively fast curing, moderate strength, good adhesion, good mattness, being environmentally friendly and the like.

Classes IPC  ?

• C09D 183/06 - Polysiloxanes contenant du silicium lié à des groupes contenant de l'oxygène
• C09D 183/04 - Polysiloxanes

Abrégé

A device for coating RTV anti-fouling flashover coating on ceramic or glass umbrella-type and bell-type insulators, comprising a main machine frame (1), a machine head rotating frame (7), a deceleration frequency modulation motor (8), and an insulator quick-fit connector (9); the machine head rotating frame is rotatably connected to the main machine frame by means of a rotating-angle shaft and the bearing supports (4) at the two ends thereof, the deceleration frequency modulation motor being fixedly arranged on the machine head rotating frame, and the output end of the deceleration frequency modulation motor being connected to the insulator quick-fit connector. The advantageous effects thereof are: the quality of dip-coated ceramic or glass insulators of different specifications is stable, and the surface thereof is glossy and bubble-free, there is no build-up or dripping of the coated layer, and thickness is uniform; during the coating process, VOC emissions are low, and production is environmentally friendly and safe; the dip-coating is highly automatised, operation is easy, and the device can be used to implement industrialised automated coating of RTV anti-fouling flashover coating onto ceramic and glass insulators, saving substantial costs.

Classes IPC  ?

• H01B 19/04 - Traitement des surfaces, p. ex. application de revêtements
• H01B 17/04 - ChaînesChaînes multiples

Abrégé

A coating method for an umbrella/bell-shaped insulator RTV antifouling flashing coating, characterized in comprising the following steps: (A) cleaning the surface of an insulator, and optionally covering a part of the insulator for which coating is not required; (B) immersing the insulator into a coating for rotary coating by using a coating machine having a rotary function; and, (C) solidifying the coated insulator in room temperature and humid conditions. The coating method is simple to operate, inexpensive, of reduced pollution, and safe to produce, allows automated control for a process from immersed coating to preliminary solidification, easy-to-control product quality, and high productivity, provides a smooth appearance free of bubbles, free of hanging drips, free of accumulations, even coating, and uniform thickness.

Classes IPC  ?

• H01B 19/04 - Traitement des surfaces, p. ex. application de revêtements

Abrégé

An organosilicon coating specially for matt weather resistance EMAS, comprising: 80 to 130 parts by weight of α,ω-dihydroxy polydimethylsiloxane; 0.5 to 10 parts by weight of a linear polydimethylsiloxane with the end group being a hydroxy group; 1 to 10 parts by weight of fumed silica; 10 to 50 parts by weight of precipitated silica; 1 to 5 parts by weight of a colour masterbatch; 0.9 to 5 parts by weight of a catalyst organotin chelate; a cross-linking agent, comprising 1.5 to 7 parts by weight of methyltrimethylethylketoximinosilane, 1.5 to 7 parts by weight of vinyltrimethylethylketoximinosilane, and 1 to 7 parts by weight of aminopropyltriethoxysilane; 1.5 to 6 parts by weight of a delustering agent; and 250 to 350 parts by weight of a solvent. The coating has the properties of a low viscosity, high flow, relatively fast curing, a moderate strength, a good adhesion, a good matte effect, being environmentally friendly and the like.

Classes IPC  ?

• C09D 183/04 - Polysiloxanes
• C09D 183/06 - Polysiloxanes contenant du silicium lié à des groupes contenant de l'oxygène