Pure silicon BETA molecular sieve with ultraviolet resistance and preparation method thereof

Abstract

The invention discloses a preparation method of a pure silicon BETA molecular sieve with ultraviolet resistance, wherein the preparation method comprises the steps: step 1, mixing raw materials according to a molar ratio of SiO2:(0.3-0.6)B2O3:(0.75-1.5)template agent:(10-20)water to obtain a gel reactant; step 2, carrying out hydrothermal dynamic crystallization at the temperature of 120-180 DEG Cfor 4-8 days, filtering, washing and drying the crystallized product, and roasting at the temperature of 500-700 DEG C for 4-6 hours to obtain a silicon-boron molecular sieve B-MWW; step 3, mixing the prepared silicon-boron molecular sieve B-MWW matrix with ammonium nitrate or ammonium chloride with the concentration of 4-10 mol/L according to the mass ratio of 1:(30-50), carrying out acid pickling treatment for 2-6 hours at the temperature of 60-90 DEG C, repeating the acid pickling operation twice, and then filtering; and washing, drying and roasting at the temperature of 500-700 DEG C for6-10 hours to obtain the pure silicon BETA molecular sieve raw powder. The pure silicon BETA molecular sieve prepared by the method is used as an anti-aging auxiliary agent of plastic, and the anti-ultraviolet aging life of the plastic added with the molecular sieve can be prolonged by 3 times or more compared with that of a plastic added with a common anti-aging auxiliary agent.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a pure silicon BETA molecular sieve with anti-ultraviolet performance and a preparation method. Background technique [0002] Plastic materials are closely related to our lives today. Whether it is household plastic wrap, garbage bags, refrigerators, washbasins, shopping bags in shopping malls, packaging bags for various commodities, etc., they are all made of plastic. What we usually call plastic is not a single component, it is formulated from many materials. Among them, high molecular polymer is the main component of plastics. In addition, in order to improve the performance of plastics, various auxiliary materials such as fillers, plasticizers, colorants, and anti-aging agents must be added to high molecular compounds. Most plastics have the disadvantage of not being resistant to UV aging. [0003] At present, the commonly used anti-aging methods for plastic materials are: ...

AI Technical Summary

Problems solved by technology

Most plastics have the disadvantage of not being resistant to UV aging

[0003] At present, the commonly used anti-aging methods for plastic materials are: (1) Physical protection methods (such as thickening, coating, outer layer compounding, etc.), this method has the disadvantage of short aging resistance life; (2) Improve the processing technology, this method is passed in the Add oxygen removal device or vacuum device during polymerization or processing to slow down the influence of oxygen, but this method can only guarantee the performance of the material when it leaves the factory, and this method can only be implemented from the source of material preparation, and cannot solve its problem in the production process. Aging problems during processing and use

(3) Structural design or modification of polymer materials. There are groups that are easily aged in the molecular structure of many polymer materials. Through the molecular structure design of materials, groups that are not easy to age are replaced by groups that are easy to age. The method requires relatively high technical content and high cost (4) Add anti-aging additives. This method is currently the most effective way to improve the aging resistance of plastics. This method has low cost and does not need to change the production process. The aging aid is directly mixed with resin and other raw materials, and then extruded, granulated or injected. This addition method is simple and easy, but the commonly used anti-aging aids generally have a short service life, so the present invention produces a pure Silicon BETA molecular sieve is used as an anti-aging additive for plastics. After adding this molecular sieve, the anti-ultraviolet aging life of plastics can be increased by more than 3 times than that of ordinary anti-aging additives.