Abstract: The present invention belongs to the field of preparation of high performance polymers, and specifically relates to a low dielectric constant polymer containing dinaphthyl and hexafluorocyclobutyl ether units, and preparation method and use thereof. The polymer is prepared as follows: under the effect of an alkali, 1-naphthol bromotetrafluoroethane ether is prepared from 1-naphthol and tetrafluorodibromoethane in an organic solvent, and then reduced by a zinc powder so as to obtain 1-naphthol trifluorovinyl ether. 1-naphthol trifluorovinyl ether is treated at a high temperature to obtain a bisnaphthol hexafluorocyclobutyl ether monomer. The monomer is subjected to oxidative coupling in the presence of ferric trichloride so as to obtain a thermal polymer containing dinaphthyl and hexafluorocyclobutyl structural units with a good film-forming property, and in a nitrogen atmosphere, the temperature for 5% weight loss (Td5%) of the obtained film is 437° C., and the carbon residue yield at 1000° C. is 54.24%.

Abstract: An arc ignition device of a plasma welding gun includes an igniter and a fixture. The igniter includes an arc ignition block (5), a spring (6) and a tungsten needle (3), and the fixture includes a fastening member (4), a tungsten needle clamp (7), a base (2) and a magnet (1). The arc ignition block and the tungsten needle are conductors. And the tungsten needle is clamped by the fixture with the fastening member cooperated with an arc surface of the tungsten needle clamp. Additionally, the magnet is embedded in the base, by means of which the arc ignition device can be attached to any position. Through the precise relative motion of the spring, the arc ignition device implements a high-requirement arc ignition function.

Abstract: An arc ignition device of a plasma welding gun includes an igniter and a fixture. The igniter includes an arc ignition block (5), a spring (6) and a tungsten needle (3), and the fixture includes a fastening member (4), a tungsten needle clamp (7), a base (2) and a magnet (1). The arc ignition block and the tungsten needle are conductors. And the tungsten needle is clamped by the fixture with the fastening member cooperated with an arc surface of the tungsten needle clamp. Additionally, the magnet is embedded in the base, by means of which the arc ignition device can be attached to any position. Through the precise relative motion of the spring, the arc ignition device implements a high-requirement arc ignition function.

Abstract: An ink jet printing method having the steps of: A) providing an ink jet printer that is responsive to digital data signals; B) loading the printer with an ink jet recording element having a substrate having thereon: i) a subbing layer of a polymeric binder and a borate or a borate derivative, the borate or borate derivative being present in an amount of from up to about 3 g/m2, and the weight ratio of the polymeric binder to the borate or borate derivative is from about 0.2:1 to about 3:1; and ii) an image-receiving layer of inorganic particles and a cross-linkable polymer containing hydroxyl groups, the cross-linkable polymer being present in an amount of less than about 50 g/m2, and the weight ratio of the cross-linkable polymer to the inorganic particles is from about 5:95 to about 30:70; C) loading the printer with an inkjet ink composition; and D) printing on the image-receiving layer using the ink jet ink in response to the digital data signals.

Abstract: The invention provides an aqueous cosmetic composition for providing a durable crosslinked film on a keratinous substrate having at least two water-based film-form polymers including at least one water-based self-crosslinking film-form polymer. The self-crosslinking film-form polymer has functional groups capable of crosslinking with each other after the cosmetic composition is placed on the keratinous substrate. The aqueous cosmetic composition as whole forms a film on keratinous substrate that adheres to the keratinous substrate and is removable and durable.

Abstract: An ink jet printing method having the steps of: A) providing an ink jet printer that is responsive to digital data signals; B) loading the printer with an ink jet recording element having a substrate having thereon: i) a subbing layer of a polymeric binder and a borate or a borate derivative, the borate or borate derivative being present in an amount of from up to about 3 g/m2, and the weight ratio of the polymeric binder to the borate or borate derivative is from about 0.2:1 to about 3:1; and ii) an image-receiving layer of inorganic particles and a cross-linkable polymer containing hydroxyl groups, the cross-linkable polymer being present in an amount of less than about 50 g/m2, and the weight ratio of the cross-linkable polymer to the inorganic particles is from about 5:95 to about 30:70; C) loading the printer with an inkjet ink composition; and D) printing on the image-receiving layer using the ink jet ink in response to the digital data signals.

Abstract: An ink jet recording element including a substrate having thereon: a) a subbing layer of a polymeric binder and a borate or a borate derivative, the borate or borate derivative being present in an amount of from up to about 3 g/m2, and the weight ratio of the polymeric binder to the borate or borate derivative is from about 0.2:1 to about 3:1; and b) an image-receiving layer including inorganic particles and a cross-linkable polymer containing hydroxyl groups, the crosslinkable polymer being present in an amount of less than about 25 g/m2, and the weight ratio of the cross-linkable polymer to the inorganic particles is from about 5:95 to about 30:70.