59results about How to "Moderate response speed" patented technology

The invention discloses a method for synthesizing diamide podand extraction agent, wherein chloro-carbonic ester and diglycolic anhydride react to generate mixed anhydride under the action of tertiary amine, and then the reaction is performed with amine to generate the diamide podand extraction agent. The method has mild reaction condition, can be performed at a low temperature, and has high reaction speed and short consumed time; the product purification operation is simple and easy; the obtained diamide podand extraction agent can meet the extraction purity requirement, and is beneficial to establishing flow that the diamide podand is used for treating high-level liquid waste in spent fuel reprocessing plant; the used chloro-carbonic ester is easy to prepare and has a low price, therefore, the cost for preparation of a great amount of extraction agent is greatly reduced; and besides, the yield of the extraction agent is high, so that the method is very suitable for industrial production and application.

The invention discloses a scraping coating type polyurea elastomer corrosion-resistant and wear-resistant material and a preparation method thereof. The scraping coating type polyurea elastomer corrosion-resistant and wear-resistant material is characterized by comprising an ingredient A and an ingredient B, wherein the ingredient A is prepolymers with NCO end groups obtained through the reaction between 30 to 40 mass percent of polyether polyol and 60 to 70 mass percent of polyisocyanates; the ingredient B is prepared from 30 to 40 mass percent polyaspartic acid ester, 60 to 70 mass percent of filling materials and a small number of auxiliary agents through high-speed dispersion grinding. In the use process, the prepared ingredient A and the prepared ingredient B are weighed according to the weight ratio of 1:4, and are then uniformly mixed; next, scraping coating construction is performed. The material has the characteristics of high mechanical intensity, corrosion resistance, wear resistance, good anti-seeping performance, aging resistance, proper reaction speed, no solvent, convenient construction and the like. The scraping coating type polyurea elastomer corrosion-resistant and wear-resistant material is particularly suitable for industrial and mining enterprise equipment and spare part anti-corrosion wear-resistant liners.

The present invention proposes a preparation method of a bifunctional lithium-based initiator, in which metal lithium reacts with α-methylstyrene or isoprene in a mixed solvent mainly composed of non-polar solvents to directly prepare a difunctional anion Polymer. The mixed solvent is mainly aromatic hydrocarbons or alkanes, or a mixture of the two, containing ethers or amines, or a mixture of the two, wherein the content of aromatic hydrocarbons and alkanes is 50-99.9% (volume), and the content of ethers and amines is 0.1-50%. (volume), conjugated olefin and metal lithium are reacted at a temperature of -50 to 50° C. for 1 to 6 hours, and the reactant is filtered to obtain a bifunctional initiator. The initiator prepared by this method does not contain fused-ring aromatic hydrocarbons, and the content of polar substances in the initiator system can be adjusted in a wide range. It can be used for the synthesis of polydiene series rubbers with low side group content, and has good stability and moderate reaction speed. specialty.