Non-silicon defoaming agent and preparation method thereof

Abstract

The invention provides a non-silicon defoaming agent and a preparation method thereof. In the prior art, vegetable oil and derivatives thereof are used as a carrier, white carbon black and fatty acidmetal soap are used as main defoaming substances of a defoaming agent, and layering of the defoaming agent can be caused even the fatty acid metal soap has very good anti-foaming performance since thefatty acid metal soap cannot swell in the vegetable oil and the derivatives thereof and exists in a granule form; in order the solve the problem, a hydrogenated castor oil substance is introduced inthe non-silicon defoaming agent, and through a specific technology, the stability of a product is ensured while the anti-foaming performance is ensured; on the other hand, through the specific technology, the hydrogenated castor oil substance is introduced twice, and the anti-foaming performance of the product is further increased by utilizing the characteristic of 'thickening' of the hydrogenatedcastor oil substance; in order to enable the hydrogenated castor oil substance in 'thickening' and a using system to have good compatibility, castor oil polyoxyethylene-polyoxypropylene ether oleatein a specific structure is introduced, and good compatibility of the product is ensured.

Description

technical field [0001] The invention relates to a non-silicon defoamer and a preparation method thereof. The defoamer belongs to fine chemical additives. Therefore, the invention belongs to the technical field of fine chemicals. technical background [0002] Defoamer is a kind of fine chemical additive. The use of defoamer not only needs to meet its own stability and good antifoaming performance. In coatings, adhesives, inks, metalworking fluids and other industries, defoamers It needs to have good compatibility with the foaming system at the same time, and will not bring adverse effects to the foaming system. In recent years, with the continuous attention of governments at all levels to environmental protection, defoamers, as a chemical additive, need more Only with good environmental protection performance can it meet the increasingly stringent market requirements. [0003] From the key components of defoaming, it is mainly divided into silicone defoaming agent and non-or...

AI Technical Summary

Problems solved by technology

Silicone defoamers have the characteristics of less addition, low surface tension, no physiological activity, and high safety. However, in some cases, low surface tension and good spreading properties have become the shortcomings of silicone defoamers. It is because once the silicone is demulsified, it is easy to form silicon spots on the surface or cause pump blockage, which directly affects the performance of the foaming system; non-organic silicon defoamers mainly include polyether defoamers and mineral oil defoamers , compared with silicone defoamers, these two defoamers have excellent compatibility with industrial additives and do not affect the stability of the foaming system

However, polyether defoamers and mineral oil defoamers have certain deficiencies in defoaming and antifoaming properties, and the price of polyether defoamers is relatively high. At the same time, the VOC (volatile organic compounds) of some polyether defoamers Compound) content will bring adverse effects on environmental protection. Similarly, the currently commonly used mineral oil defoamers mostly use base oil extracted from petroleum by physical distillation as the entire carrier or part, and there are also VOC excessive High problem, will bring harm to the environment

[0004] CN104479439B introduces vegetable oil and its derivatives and mineral oil in the system of alkyl silicone oil and silicon dioxide, so that it is well miscible with mineral oil by controlling the average carbon number of alkyl silicone oil, and mineral oil and vegetable oil The ratio of its derivatives is controlled between 1:6 and 4:7, which finally effectively solves the problems of shrinkage, edge shrinkage and depression of the coating film, and also improves the defoaming and antifoaming performance and stability of the defoamer but did not discuss the stability of the system and the anti-foaming performance of the simple vegetable oil and its derivatives as the carrier, the VOC content of the product is still relatively high; in CN101991975B, mineral oil is used as the carrier, and fatty acid metal soap and fatty acid are selected to be added simultaneously Amide, which improves the stability of the product and further improves the anti-foaming performance. With the improvement of the anti-foaming performance and stability of the product, the product still uses mineral oil as the carrier, and the final product has high VOC content and poor environmental performance. Utilize mineral oil as carrier in CN1762531A, polyether is defoaming synergist, cooperates fine particles such as white carbon black, aluminum stearate to prepare defoaming agent as defoaming material, the defoaming performance of product and environmental protection performance need Further improvement; the document "Modification of Soybean Oil and Application in Defoamer" introduces that the compounding of mineral oil and soybean oil improves the stability of the defoamer system within a certain range, and the defoaming and antifoaming performance of the product remains to be seen. Improve; Utilize vegetable oil, fatty acid amide, fatty acid metal soap, white carbon black, emulsifying agent, defoaming aid in CN105983252A to be the environmentally friendly defoamer of raw material synthesis renewable and degradable, but the middle fatty acid metal soap of product can't be swollen in vegetable oil , the problem of poor product stability has not been solved, and the selection of polysiloxane as a defoaming aid will make the compatibility of the product worse; Temperature Adaptability of Castor Oil

Due to its structural characteristics, its VOC (volatile organic compound) content is high, which does not meet the current environmental protection development requirements of the industry. In order to reduce the VOC content of the product, some patented technologies use natural vegetable oil instead of part of the mineral oil or all of the mineral oil as the carrier. To achieve the purpose of reducing VOC, but the stability, anti-foaming performance and compatibility of the product cannot be guaranteed at the same time, and the final VOC content of the product still needs to be further reduced

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