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CN-116808637-B - Renewable defoaming agent and preparation method and application thereof

CN116808637BCN 116808637 BCN116808637 BCN 116808637BCN-116808637-B

Abstract

The invention discloses a renewable defoaming agent, a preparation method and application thereof, and belongs to the technical field of defoaming agents. The preparation method comprises the specific steps of uniformly mixing chitosan, hydrogen-containing silicone oil, a solvent and a catalyst, heating for reaction, and then adding vinyl silicone oil and fumed silica to obtain the renewable defoamer. The renewable defoamer prepared by the invention has multiple functions in water treatment, can adsorb flocculation and control foam, has small loss rate and good biodegradation rate, is environment-friendly in raw materials, and can reduce environmental pollution.

Inventors

  • HU WEI

Assignees

  • 南京英伟莱新材料有限公司

Dates

Publication Date
20260508
Application Date
20230810

Claims (7)

  1. 1. A preparation method of a renewable defoaming agent is characterized by mixing 100 kg of chitosan with 30 kg of solvent dimethylbenzene, heating to 85 ℃, adding 15.3 kg of side chain hydrogen-containing silicone oil with the hydrogen content of 50 Pa.s after the chitosan is dissolved, adding a catalyst tetramethylammonium hydroxide, reacting for 4 hours at 120 ℃, adding 9.2 kg of vinyl-terminated silicone oil with the viscosity of 350 Pa.s, karstedt platinum catalyst, reacting for 2 hours at 120 ℃, adding 1.3 kg of hydrophobic white carbon black with the specific surface area of 200m 2 /g, and finally removing the solvent dimethylbenzene after the hydrophobic white carbon black is adsorbed.
  2. 2. A preparation method of a renewable defoaming agent is characterized by mixing 100 kg of chitosan with 30 kg of solvent dimethylbenzene, heating to 92 ℃, adding 22.4 kg of side chain hydrogen-containing silicone oil with the hydrogen content of 0.18% and the viscosity of 100 Pa.s after the chitosan is dissolved, adding a catalyst tetramethylammonium hydroxide, reacting for 4 hours at 120 ℃, adding 12.8 kg of vinyl-terminated silicone oil with the viscosity of 500 Pa.s, karstedt platinum catalyst, reacting for 2 hours at 120 ℃, adding 1.5 kg of hydrophobic white carbon black with the specific surface area of 200m 2 /g, and finally removing the solvent dimethylbenzene after the adsorption of the hydrophobic white carbon black is completed, thereby obtaining the renewable defoaming agent.
  3. 3. A preparation method of a renewable defoaming agent is characterized by mixing 100 kg of chitosan with 30 kg of solvent dimethylbenzene, heating to 85 ℃, adding 22.4 kg of side chain hydrogen-containing silicone oil with the hydrogen content of 0.18% and the viscosity of 100 Pa.s after the chitosan is dissolved, adding a catalyst tetramethylammonium hydroxide, reacting for 4 hours at 120 ℃, adding 16.3 kg of vinyl-terminated silicone oil with the viscosity of 1000 Pa.s, karstedt platinum catalyst, reacting for 2 hours at 120 ℃, adding 1.6 kg of hydrophobic white carbon black with the specific surface area of 300m 2 /g, and finally removing the solvent dimethylbenzene after the adsorption of the hydrophobic white carbon black is completed, thereby obtaining the renewable defoaming agent.
  4. 4. A preparation method of a renewable defoaming agent is characterized by mixing 100 kg of chitosan with 30 kg of solvent dimethylbenzene, heating to 92 ℃, adding 23.8 kg of side chain hydrogen-containing silicone oil with the viscosity of 100 Pa.s and the hydrogen content of 0.18% after the chitosan is dissolved, adding a catalyst tetramethylammonium hydroxide, reacting for 4 hours at 120 ℃, adding 14.3 kg of vinyl-terminated silicone oil with the viscosity of 500 Pa.s, reacting for 2 hours at 120 ℃, and finally removing the solvent dimethylbenzene to obtain the renewable defoaming agent.
  5. 5. A preparation method of a renewable defoaming agent is characterized by mixing 100 kg of chitosan with 30 kg of solvent dimethylbenzene, heating to 95 ℃, adding 28.3 kg of hydrogen-containing silicone oil with the hydrogen content of 350 Pa.s and 0.043% at both ends after the chitosan is dissolved, adding a catalyst tetramethylammonium hydroxide, reacting for 4 hours at 120 ℃, adding 8.5 kg of vinyl-terminated silicone oil with the viscosity of 500 Pa.s, karstedt platinum catalyst, reacting for 2 hours at 120 ℃, adding 1.5 kg of hydrophobic white carbon black with the specific surface area of 300m 2 /g, and finally removing the solvent dimethylbenzene after the hydrophobic white carbon black is adsorbed.
  6. 6. The renewable defoamer prepared by the method of any one of claims 1 to 5.
  7. 7. Use of the renewable defoamer of claim 6 for adsorption, flocculation and defoaming.

Description

Renewable defoaming agent and preparation method and application thereof Technical Field The invention belongs to the technical field of defoamers, and particularly relates to a renewable defoamer and a preparation method and application thereof. Background Harmful foam can be generated in the industrial production of latex removal, textile sizing, food fermentation, biological medicine, pesticides, coatings, petrochemical industry, papermaking, industrial cleaning and the like, the production efficiency can be greatly reduced, the waste of raw materials and products is caused, the quality of the products is influenced and the like, and therefore, the defoaming agent can be added in the production process. The defoamer is mainly a liquid compound product and is mainly divided into four types of mineral oils, organic silicon, polyethers and high-carbon alcohols. Mineral oil defoamers are typically composed of carriers, actives and the like. The carrier is a substance with low surface tension, which is used for carrying and diluting, and the common carrier is water or fatty alcohol. Silicone-based defoamers typically include polydimethylsiloxane and the like. The organic silicon defoamer has the characteristics of poor solubility, high defoaming speed, good foam inhibition, layering at high temperature, low defoaming speed, poor foam inhibition and the like. Polyether defoamers include polyoxypropylene oxyethylene glyceryl ether and the like. The polyether defoamer has the characteristics of long foam inhibition time, good effect, high defoaming speed, good thermal stability and the like. Higher alcohols are linear molecules with strong hydrophobicity and weak hydrophilicity, and are effective defoamers in water systems. The industrial production has been increasingly aqueous, and in industrial fields such as coating and agricultural chemical, physical foam removal and chemical defoaming are required because of the formation of foam which is more or less harmful to the industrial production due to the aqueous. The national requirements on environmental protection are higher and higher, and the environment-friendly sustainable requirements on the auxiliary agents are also provided. Chitosan is obtained by deacetylation of chitin widely existing in nature, and chemical name is polyglucosamine (1-4) -2-amino-B-D glucose, after being obtained first by French Rouget in 1859, the natural polymer has excellent properties such as biological functionality and compatibility, blood compatibility, safety, microbial degradability and the like, which are widely paid attention to by various industries, and great progress is made in application research in various fields such as medicine, food, chemical industry, cosmetics, water treatment, metal extraction and recovery, biochemistry and biomedical engineering. The effect of chitosan on reducing blood lipid and blood glucose is reported for patients. The chitosan, which is the deacetylated product of chitin, has greatly improved solubility due to the existence of a large amount of free ammonia in the molecular structure, has unique physicochemical properties and physiological functions, and has wide application prospects in agriculture, medicine, food, cosmetics and environmental protection. The main raw materials for preparing the chitosan are from waste shrimp shells and crab shells in an aquatic processing plant, and the main components of the chitosan comprise calcium carbonate, protein and chitin (about 20%). The process of preparing chitosan from shrimp and crab shells is actually the decalcification, deproteinization, decolorization and deacetic acid process. Disclosure of Invention The first technical problem to be solved by the present invention is to provide a simple preparation method of a renewable defoaming agent, which is used for preparing the renewable defoaming agent. The invention aims to provide a renewable, degradable, energy-saving and environment-friendly defoamer. The third technical problem to be solved by the invention is to provide an application of a renewable defoamer in water treatment. In order to solve the problems, the technical scheme adopted by the invention is as follows: A preparation method of a renewable defoaming agent comprises the steps of uniformly mixing chitosan, hydrogen-containing silicone oil, a solvent and a catalyst, heating for reaction, and then adding vinyl silicone oil and fumed silica to obtain the renewable defoaming agent. The heating temperature is 100-140 ℃. The hydrogen-containing silicone oil is one or more of heptamethyltrisiloxane, side chain hydrogen-containing silicone oil and terminal chain hydrogen-containing silicone oil. The hydrogen-containing silicone oil is preferably chain-terminated hydrogen-containing silicone oil, the viscosity of the chain-terminated hydrogen-containing silicone oil is 10-400 Pa.s, the hydrogen content is 0.01-0.5%, the viscosity is preferably 50-100 Pa.s, and the hydrogen content is