Foaming agent compound for low-temperature decomposition of expanding rubber and preparation method of foaming agent compound

Abstract

The invention discloses a foaming agent compound for low-temperature decomposition of expanding rubber, the foaming agent compound comprises a foaming component and an activating auxiliary agent, the foaming component is composed of one or more of an AC foaming agent, an OBSH foaming agent, an H foaming agent, a TSH foaming agent and a sodium bicarbonate foaming agent, the activating auxiliary agent is composed of one or more of a zinc compound, a weak acid salt of sodium, a treated urea auxiliary agent, aromatic sulfinate and stearic acid; according to the invention, azodicarbonamide and the low-temperature foaming agent are compounded, a plurality of activators are matched, and the foaming agent compound which is suitable for industrial application at 150 DEG C, is completely decomposed within 5 minutes and has the gas generation amount higher than 180ml / g is prepared through blending and grinding processes, so that the expanding rubber can reach a higher foaming ratio at a lower temperature, and sagging and foaming height are considered. Meanwhile, bubbles in the expanding rubber are uniformly dispersed, the surface of the expanding rubber is smooth and fine, and the cost performance is high.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a foaming agent compound used for low-temperature decomposition of expanded rubber and a preparation method thereof. Background technique [0002] Rubber foaming is an important process. Foamed rubber can be lighter, more cost-effective, and has good sound insulation and shock absorption functions. With the effective promotion of energy saving, cost reduction and efficiency increase of various OEMs, the baking temperature is constantly increasing. The downward trend, the foaming temperature of the expanded rubber needs to be lowered continuously in accordance with the baking temperature of the main engine factory. In the process of preparing the foamed rubber material, the foaming agent is the main raw material that affects the foaming of the rubber. The blowing agent is imminent; [0003] OBSH, TSH and sodium bicarbonate are commonly used foaming agents i...

AI Technical Summary

Problems solved by technology

[0003] OBSH, TSH and sodium bicarbonate are commonly used foaming agents in the industry. The decomposition temperature is low, but the gas generation is small, and the expansion ratio of the expansion rubber is difficult to meet the requirements. The foaming agent AC is low in price and high. The most commonly used foaming agent in the processing industry, but the decomposition temperature of azodicarbonamide is 200-220°C, which is relatively high. Generally, several foaming agents are compounded, or an appropriate amount of activator is added to promote its decomposition and reduce Decomposition temperature speeds up the decomposition rate. In addition to the two important indicators of decomposition temperature and gas generation, rapid decomposition is also an important factor, which seriously affects the foaming height and sagging of the expansion rubber. In addition, the cell uniformity and surface roughness are also important. It is noteworthy that the patent application with the publication number CN106009026A discloses a method for preparing a foaming agent, which reduces the decomposition temperature of the foaming agent to a reasonable temperature suitable for industrial applications, and at the same time reduces the amount of ammonia released in the foamed product. However, the patent only mentioned the decomposition temperature of azodicarbonamide, and did not pay attention to issues such as gas generation, decomposition rate, cell uniformity, and surface roughness;

[0004] At present, one or more foaming agents are compounded, combined with an appropriate amount of activator, to reduce the decomposition temperature to a reasonable temperature suitable for industrial applications, and at the same time meet the appropriate gas generation, decomposition rate, cell uniformity, and surface roughness. There are few reports on the foaming agent, therefore, the present invention proposes a foaming agent compound and preparation method thereof for the low-temperature decomposition of expanded rubber to solve the problems in the prior art

Images