4 results about "Rare earth" patented technology

The invention discloses a rare-earth metal arylamine group compound as well as preparation method and application thereof. The invention discloses the rare-earth metal arylamine group compound which is characterized in that a general formula of the rare-earth metal arylamine group compound is (2,6-R12PhNH)5LnLi2(THF)2, wherein Ln is a rear-earth metal selected from one of neodymium, samarium, ytterbium or yttrium; R1 is selected from one of hydrogen, methyl or isopropyl. The rare-earth metal arylamine group compound has the advantages that the rare-earth metal arylamine group compound has a definite structure; raw materials used in the preparation method are simple, easily obtained and cheap; the reaction process is simple and easily operated; the rare-earth metal arylamine group compound product is conveniently purified and the yield of the product is high; the rare-earth metal arylamine group compound has a high activity when acting as a single component catalyst to catalyze a hydrogen phosphine reaction of aldehyde or ketone and phosphite ester; the use amount of the catalyst is less; the yield is high; a substrate has wide universality; a new and simple method is provided for synthesis of a-hydroxyphosphonate.

The present disclosure relates to a sound generating device, a terminal and a sound generating control method, wherein the sound generating device comprises a sound generating body and a heating unit, the sound generating body comprises a sealed space, the sealed space is filled with a heat-sensitive gas, and the heating unit is accommodated in the sealed space; the sound generating body comprises a sound generating unit, the heating unit is used for heating the heat-sensitive gas to make the heat-sensitive gas expand, the sound generating body is used for cooling the heat-sensitive gas to make the heat-sensitive gas contract, and the expansion or contraction of the heat-sensitive gas drives the sound generating unit to vibrate and generate sound. The sound generating device realizes sound generation through the above-mentioned thermoacoustic effect, does not need to be provided with structures such as magnetic steel and voice coil, simplifies the structure of the sound generating device, and better reduces the volume of the sound generating device. Moreover, the use of rare earth materials such as rubidium iron boron can be avoided, and the cost of the sound generating device is reduced.

The invention discloses an anti-corrosion treatment process for parts of a sampling machine. The anti-corrosion treatment process comprises the following steps that 1), impurity removal and rust removal are carried out on the surface of each part of the sampling machine; 2), sanding is carried out on the surface of each part which is subjected to the treatments in the step 1) of the sampling machine; 3), a sampling pipe of the sampling machine is soaked in rare-earth preservative which is subjected to a curing treatment, the rare-earth preservative is taken out after deposited on the surface of the sampling pipe, and then the rare-earth preservative is naturally air-dried at normal temperature; 4) the rare-earth preservative which is subjected to the curing treatment is sprayed on the surfaces of the other parts of the sampling machine; and 5), the sampling pipe which is subjected to the treatment in the step 3) is coated with an antioxygenic resin layer, and the other parts of the sampling machine are coated with the antioxygenic resin layer. According to the anti-corrosion treatment process, on one hand, the corrosion-resistant layer can be prevented from being impacted and rubbed and the anti-corrosion layer is firmly adhered to the surface of the sampling pipe, and on the other hand, the problem that the surface of the sampling pipe is corroded and damaged as oxygen and water in the atmosphere permeate and diffuse to the surface of the sampling pipe can be prevented.

The invention relates to the technical field of guitar string coating, and particularly discloses a coated string-free guitar and a preparation method thereof. A film-coated string-free guitar comprises a string-free guitar body, the string-free guitar body is provided with a silica gel touchpad, a push plate and an indicating lamp, the surface of the silica gel touchpad is covered with a transition layer, and the outer surface of the transition layer is covered with a vacuum film coating layer. The transition layer comprises the following components in parts by weight: 90-97 parts of magnesium oxide; 3-4 parts of rare earth yttrium; 1-2 parts of rare earth cerium; the preparation method comprises the following steps: (1) preparing touch silica gel for the silica gel touch panel, and sequentially sputtering and depositing a transition layer and a vacuum coating layer on the touch silica gel by adopting a vacuum coating technology to obtain coated touch silica gel; and (2) applying the film-coated touch silica gel to the silica gel touch panel, and assembling the film-coated touch silica gel, the push plate and the indicator lamp on the string-free guitar body to obtain the film-coated string-free guitar. The film-coated string-free gem provided by the invention has excellent stability in the application process.