Plastic foaming catalyst for replacing zinc oxide and preparation method thereof

Abstract

The invention discloses a plastic foaming catalyst for replacing zinc oxide and a preparation method thereof. The plastic foaming catalyst is zinc oxide modified by an organic acid. The preparation method includes the steps of: adding the organic acid and the zinc oxide according to the molar ratio of 0.9-1.0:1 into a reaction kettle, heating the reaction kettle to 145-155 DEG C with stirring, maintaining the temperature, and carrying out a reaction for 0.3-0.4 h to obtain the plastic foaming catalyst. The plastic foaming catalyst can achieve the performance requirements, which cannot be satisfied with zinc oxide as the catalyst, in a foamed product. The plastic foaming catalyst allows the foamed product to be free of stimulating ammonia smell and enables residue of formamide to be reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical modification, and specifically relates to a novel catalyst, a pre-dispersed masterbatch and a preparation method thereof, which can replace zinc oxide as a decomposition accelerator of an AC foaming agent in the plastic foaming industry. Background technique [0002] For the azodicarbonamide blowing agent AC, without catalysis, the temperature of the gas generated by its decomposition is 200°C, but when zinc oxide is added as the decomposition catalyst, the decomposition temperature drops to about 145°C to 155°C. Since zinc oxide is distributed in the form of particles, its volume ratio is only less than 5% no matter how uniform the dispersion is, that is to say, there is no zinc oxide in more than 95% of the volume. The AC blowing agent particles dispersed in this 95% do not have access to zinc oxide and thus are not catalyzed. But under this decomposition condition, the blowing agent produces ...

AI Technical Summary

Problems solved by technology

However, its point distribution greatly reduces the possibility of contact with the AC blowing agent particles, thus causing the AC blowing agent exposed to zinc oxide to begin to decompose at 145 ° C, while the AC blowing agent not exposed to zinc oxide Bubble or start to decompose at 200°C

This has just caused the possibility that AC decomposes too fast and too slow or decomposes endlessly

In practical applications, it is manifested in the defects of uneven cell thickness, color difference between the two sides and the middle, and failure to meet the fineness requirements of foamed product cells.

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