A kind of preparation method of defoamer for waste water treatment

Abstract

The invention discloses a preparation method of a defoamer for wastewater treatment, belonging to the field of water treatment agents. The preparation steps of the defoamer of the present invention are as follows: 1) modification treatment of organic silicone oil; 2) preparation of silicone paste; 3) compounding of defoamer. The defoamer prepared by the method of the present invention adopts organic silicon oil with good chemical stability, is compounded with silicone paste, emulsifying auxiliary agent and the like after polyether modification. The defoamer has strong chemical stability, strong acid and alkali resistance, strong defoaming and antifoaming ability, less added amount, long antifoaming time, and the product will not increase the COD of wastewater, avoiding waste water caused by adding defoamers Secondary pollution.

Description

technical field

[0001] The invention belongs to the field of water treatment agents, and in particular relates to a preparation method of a defoamer for waste water treatment. Background technique

[0002] In the process of wastewater treatment, it is easy to generate a large amount of foam, which needs to be eliminated in time. Generally, defoamers are added regularly. At present, defoamers are mainly divided into three categories: mineral oils, silicones, and polyethers. Ordinary defoamers have poor chemical stability, and the components in wastewater are complex, resulting in oil drift and short defoaming time of ordinary defoamers.

[0003] In recent years, the research on defoamers has mainly focused on the compounding of organosilicon compounds and surfactants, the compounding of polyethers and silicones, the compounding of water-soluble or oil-soluble polyethers and silicon-containing polyethers, etc. Foam on. As far as the current defoamers are concerned, polyethe...

Examples

preparation example Construction

[0030] A kind of preparation method of defoamer for waste water treatment of the present invention, its preparation steps are as follows:

[0031] 1) Modification of silicone oil

[0032] Mix hydrogen-containing silicone oil and polyether, and use Speier catalyst to obtain polyether-modified silicone oil, and protect the entire reaction system with inert gas;

[0033] 2) Preparation of silicone paste

[0034] Mix hydrophobic silica and dimethyl silicone oil, heat and stir to make translucent silicone paste;

[0035] 3) Compounding of defoamer

[0036] The polyether-modified silicone oil prepared in step 1), the silicone paste prepared in step 2), and the emulsification aid are mixed with water, and stirred at a high speed to obtain a defoamer for wastewater treatment.

Embodiment 1

[0038] 1) Mix 50 grams of hydrogen-containing silicone oil with a molecular weight of 5000 and 60 grams of polyether with an EO / PO ratio of 0.5, add 0.4 grams of Speier catalyst, and react at a reaction temperature of 200°C for 8 hours to obtain a polyether-modified silicone oil for later use. The whole reaction system is protected with an inert gas;

[0039] 2) Mix 20 grams of hydrophobic silica and 160 grams of dimethyl silicone oil, heat to 50°C and stir to make a translucent silicone paste;

[0040] 3) Mix 40 grams of polyether-modified silicone oil prepared in step 1), 150 grams of silicone paste prepared in step 2), 50 grams of emulsifying aid and 760 grams of water, and stir at a high speed to obtain a defoamer for wastewater treatment agent.

Embodiment 2

[0042] 1) Mix 50 grams of hydrogen-containing silicone oil with a molecular weight of 6000 and 65 grams of polyether with an EO / PO ratio of 0.6, add 0.45 grams of Speier catalyst, and react at a reaction temperature of 250°C for 9 hours to obtain a polyether-modified silicone oil for later use. The whole reaction system is protected with an inert gas;

[0043] 2) Mix 20 grams of hydrophobic white carbon black with 180 grams of dimethyl silicone oil, heat to 50°C and stir to make a translucent silicone paste;

[0044] 3) Mix 60 grams of the polyether-modified silicone oil prepared in step 1), 100 grams of the silicone paste prepared in step 2), 100 grams of emulsification aids and 740 grams of water, and stir at a high speed to obtain a defoamer for wastewater treatment agent.

technical field

[0001] The invention belongs to the field of water treatment agents, and in particular relates to a preparation method of a defoamer for waste water treatment. Background technique

[0002] In the process of wastewater treatment, it is easy to generate a large amount of foam, which needs to be eliminated in time. Generally, defoamers are added regularly. At present, defoamers are mainly divided into three categories: mineral oils, silicones, and polyethers. Ordinary defoamers have poor chemical stability, and the components in wastewater are complex, resulting in oil drift and short defoaming time of ordinary defoamers.

[0003] In recent years, the research on defoamers has mainly focused on the compounding of organosilicon compounds and surfactants, the compounding of polyethers and silicones, the compounding of water-soluble or oil-soluble polyethers and silicon-containing polyethers, etc. Foam on. As far as the current defoamers are concerned, polyethe...

Examples

preparation example Construction

[0030] A kind of preparation method of defoamer for waste water treatment of the present invention, its preparation steps are as follows:

[0031] 1) Modification of silicone oil

[0032] Mix hydrogen-containing silicone oil and polyether, and use Speier catalyst to obtain polyether-modified silicone oil, and protect the entire reaction system with inert gas;

[0033] 2) Preparation of silicone paste

[0034] Mix hydrophobic silica and dimethyl silicone oil, heat and stir to make translucent silicone paste;

[0035] 3) Compounding of defoamer

[0036] The polyether-modified silicone oil prepared in step 1), the silicone paste prepared in step 2), and the emulsification aid are mixed with water, and stirred at a high speed to obtain a defoamer for wastewater treatment.

Embodiment 1

[0038] 1) Mix 50 grams of hydrogen-containing silicone oil with a molecular weight of 5000 and 60 grams of polyether with an EO / PO ratio of 0.5, add 0.4 grams of Speier catalyst, and react at a reaction temperature of 200°C for 8 hours to obtain a polyether-modified silicone oil for later use. The whole reaction system is protected with an inert gas;

[0039] 2) Mix 20 grams of hydrophobic silica and 160 grams of dimethyl silicone oil, heat to 50°C and stir to make a translucent silicone paste;

[0040] 3) Mix 40 grams of polyether-modified silicone oil prepared in step 1), 150 grams of silicone paste prepared in step 2), 50 grams of emulsifying aid and 760 grams of water, and stir at a high speed to obtain a defoamer for wastewater treatment agent.

Embodiment 2

[0042] 1) Mix 50 grams of hydrogen-containing silicone oil with a molecular weight of 6000 and 65 grams of polyether with an EO / PO ratio of 0.6, add 0.45 grams of Speier catalyst, and react at a reaction temperature of 250°C for 9 hours to obtain a polyether-modified silicone oil for later use. The whole reaction system is protected with an inert gas;

[0043] 2) Mix 20 grams of hydrophobic white carbon black with 180 grams of dimethyl silicone oil, heat to 50°C and stir to make a translucent silicone paste;

[0044] 3) Mix 60 grams of the polyether-modified silicone oil prepared in step 1), 100 grams of the silicone paste prepared in step 2), 100 grams of emulsification aids and 740 grams of water, and stir at a high speed to obtain a defoamer for wastewater treatment agent.

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