High-efficiency catalyst used for preparing high ring 107 glue and preparation method thereof

Abstract

The invention relates to a high-efficiency catalyst used for preparing a high ring 107 glue and a preparation method thereof. The preparation method of the catalyst comprises the following steps of: adding a catalyst A and a catalyst B in a mole ratio of 0.25-1.1 according to weight ratio into a reaction bottle with a stirrer, a thermometer sleeve, a nitrogen inserted tube and a condensation pipe; and reacting the mixture in a nitrogen atmosphere with stirring to obtain the catalyst, wherein the catalyst component A is prepared by reacting octamethylcyclotetrasiloxane and potassium hydroxide,and the catalyst component B is prepared by reacting octamethylcyclotetrasiloxane and tetramethylammonium hydroxide. In the method, a polysiloxane high-boiling point ring is adopted; the polysiloxanehigh-boiling point ring belongs to by-products of high rings; the problem of accumulation of the by-products of an organic silicon monomer factory is solved; the production cost of the 107 glue is reduced; the profit space is expanded; and the core competition ability of an enterprise is enhanced. The catalyst has high stability; the storage period of the catalyst is more than 180 days; metamorphism phenomena, such as lamination, solidification and the like, are difficult to cause; and the high-efficiency catalyst has a plurality of low-boiling point cyclic utilization times.

Description

technical field [0001] The invention relates to the technical field of a high-efficiency catalyst, in particular to a high-efficiency catalyst for high-ring production of 107 glue and a preparation method thereof. Another way of expressing the field of the present invention is: a high-efficiency catalyst for preparing α,ω-dihydroxypolydimethylsiloxane (trade name 107 gum) by mixing polymethylsiloxane with high-boiling-point ring bodies and its Preparation. Background technique [0002] In the industry, polydimethylsiloxane mixed rings (DMC) are generally used as raw materials, and potassium hydroxide aqueous solution is used as a catalyst to prepare 107 glue. The single-pass conversion rate of the product is 82-85%, and about 10-15% of the low boilers, [0003] Recycle for reuse. Tetracyclic (D 4 ) is usually separated separately for the production of high-temperature vulcanized silicone rubber, and the remaining five-ring and five-ring rings are composed of high-boiling...

AI Technical Summary

Problems solved by technology

Gaohuan uses potassium hydroxide aqueous solution as a catalyst, which is also used as a raw material for the preparation of 107 glue. However, when the low boiling substances generated during the production of 107 glue are recycled repeatedly, the product 107 glue has poor transparency and high turbidity. It does not meet the national quality standard of 107 rubber; it is difficult to achieve repeated recycling of low boiling substances, resulting in increased production costs; 107 rubber products with poor transparency and high turbidity are of low grade, and are used in downstream room temperature vulcanized silicone rubber products, coating materials and The application in fields such as potting compound is greatly restricted, resulting in a lower utilization value of high-ring than polydimethylsiloxane mixed ring (DMC), and resulting in a backlog of high-ring products

The above has become a technical bottleneck in production, seriously affecting the economic benefits of the enterprise

[0004] When the catalyst used in the prior art is used in the production of 107 glue, the turbidity of the product involved, the number of low boilers recycled and reused, and the volatile content are not ideal.