Defoaming agent for metal cutting processing fluid and preparation method of defoaming agent

Abstract

The invention discloses a defoaming agent for a metal cutting processing fluid and a preparation method of the defoaming agent. The defoaming agent for the metal cutting processing fluid comprises thefollowing constituent materials: silicone grease, modified silicone oil, an emulsifier and water, wherein the modified silicone oil is at least one of alkyl-modified silicone oil, polyether-modifiedsilicone oil and alkyl-polyether co-modified silicone oil. Meanwhile, the disclosed preparation method of the defoaming agent for the metal cutting processing fluid comprises the following steps: (1)preparation of the modified silicone oil: mixing hydrogen-containing silicone oil with a modifier for a reaction so as to obtain the modified silicone oil, wherein the modifier is at least one of olefin and polyether; and (2) preparation of the defoaming agnet for the metal cutting processing fluid: mixing the silicone grease, the modified silicone oil and the emulsifier, and then adding water forphase inversion emulsification so as to obtain the defoaming agent for the metal cutting processing fluid. The defoaming agent for the metal cutting processing fluid has excellent properties of defoaming foam inhibition, compatibility and stabilizer, requirements of harsh working conditions can be met, and the preparation method is simple, and is suitable for popularization and application.

Description

technical field

[0001] The invention relates to a metal cutting fluid defoamer and a preparation method thereof. Background technique

[0002] Metal cutting fluid is based on water and has high heat transfer efficiency. It can take away a large amount of heat in the process of metal processing to reduce the processing temperature, and can also play a lubricating role to reduce frictional resistance. However, the surface tension of water is large (72mN / m), and a large amount of foam is generated during the cutting process, which is difficult to eliminate, which affects the continuation of metal cutting. Therefore, it is necessary to add a defoamer to eliminate these harmful foam substances.

[0003] The metal cutting fluid defoamer is in the form of fine particles, and the diameter of the liquid particles is greater than 1 micron. When used, it is dispersed in the metal cutting fluid. It has insoluble or slightly soluble in water, lower surface tension than water, and better...

Examples

Embodiment 1

[0044] 25.07g of hydrogen-containing silicone oil with a hydrogen content of 0.22%, Mn=7000 (Mn represents the number average molecular weight, the same below), 114.6g of polyether CH 2 =CHCH 2 O(EO) 2 (PO) 25 OB (B, butyl, represents butyl, i.e. butyl-terminated polyether, hereinafter the same), 5.66g eicosene and 0.073g catalyst (chloroplatinic acid isopropanol solution, hereinafter the same) are added to the reaction flask; Nitrogen gas was introduced, and the reaction was carried out at 100° C. for 5 h to obtain a colorless and transparent alkyl and polyether co-modified silicone oil 1 .

[0045] Stir and mix 15g of silicone grease LAC-003 (transfer chemical industry, the same below), 20g of alkyl and polyether co-modified silicone oil 1, and 5g of emulsifier at 80°C, then cool with ice-water mixture, and add 60g of water Phase inversion emulsification was carried out to obtain milky white metal cutting fluid defoamer 1.

Embodiment 2

[0047] 20g of hydrogen-containing silicone oil with a hydrogen content of 0.18% and Mn=10000, 22.76g of polyether CH 2 =CHCH 2 O(EO) 8 (PO) 15 OH, 22.76g polyether CH 2 =CHCH 2 O(EO) 16 (PO) 16 Add OH, 3.97g of a mixture of eicosine to tetracosene and 0.035g of a catalyst into the reaction flask; blow nitrogen into it, and react at 110°C for 4 hours to obtain light yellow and transparent alkyl and polyether co-modified silicone oil 2.

[0048] Stir and mix 12g of silicone grease LAC-003, 21g of alkyl and polyether co-modified silicone oil 2 and 4g of emulsifier at 90°C, then cool at 5°C, add 63g of water for phase inversion emulsification, and obtain milky white Metal cutting fluid defoamer 2.

Embodiment 3

[0050] 20g of hydrogen-containing silicone oil with a hydrogen content of 0.18% and Mn=10000, 48.89g of polyether CH 2 =CHCH 2 O(EO) 6 (PO) 26 OH, 16.30g polyether CH 2 =CHCH 2 O(EO) 5 (PO) 15 OH and 0.0426g of catalyst were added to the reaction flask; nitrogen gas was introduced, and the reaction was carried out at 105°C for 4.5h to obtain colorless and transparent polyether-modified silicone oil 3.

[0051] Stir and mix 16g of silicone grease LAC-003, 22g of polyether co-modified silicone oil 3 and 3g of emulsifier at 85°C, then cool at 8°C, add 59g of water for phase inversion emulsification, and obtain milky white metal cutting liquid defoamer3.

technical field

[0001] The invention relates to a metal cutting fluid defoamer and a preparation method thereof. Background technique

[0002] Metal cutting fluid is based on water and has high heat transfer efficiency. It can take away a large amount of heat in the process of metal processing to reduce the processing temperature, and can also play a lubricating role to reduce frictional resistance. However, the surface tension of water is large (72mN / m), and a large amount of foam is generated during the cutting process, which is difficult to eliminate, which affects the continuation of metal cutting. Therefore, it is necessary to add a defoamer to eliminate these harmful foam substances.

[0003] The metal cutting fluid defoamer is in the form of fine particles, and the diameter of the liquid particles is greater than 1 micron. When used, it is dispersed in the metal cutting fluid. It has insoluble or slightly soluble in water, lower surface tension than water, and better...

Examples

Embodiment 1

[0044] 25.07g of hydrogen-containing silicone oil with a hydrogen content of 0.22%, Mn=7000 (Mn represents the number average molecular weight, the same below), 114.6g of polyether CH 2 =CHCH 2 O(EO) 2 (PO) 25 OB (B, butyl, represents butyl, i.e. butyl-terminated polyether, hereinafter the same), 5.66g eicosene and 0.073g catalyst (chloroplatinic acid isopropanol solution, hereinafter the same) are added to the reaction flask; Nitrogen gas was introduced, and the reaction was carried out at 100° C. for 5 h to obtain a colorless and transparent alkyl and polyether co-modified silicone oil 1 .

[0045] Stir and mix 15g of silicone grease LAC-003 (transfer chemical industry, the same below), 20g of alkyl and polyether co-modified silicone oil 1, and 5g of emulsifier at 80°C, then cool with ice-water mixture, and add 60g of water Phase inversion emulsification was carried out to obtain milky white metal cutting fluid defoamer 1.

Embodiment 2

[0047] 20g of hydrogen-containing silicone oil with a hydrogen content of 0.18% and Mn=10000, 22.76g of polyether CH 2 =CHCH 2 O(EO) 8 (PO) 15 OH, 22.76g polyether CH 2 =CHCH 2 O(EO) 16 (PO) 16 Add OH, 3.97g of a mixture of eicosine to tetracosene and 0.035g of a catalyst into the reaction flask; blow nitrogen into it, and react at 110°C for 4 hours to obtain light yellow and transparent alkyl and polyether co-modified silicone oil 2.

[0048] Stir and mix 12g of silicone grease LAC-003, 21g of alkyl and polyether co-modified silicone oil 2 and 4g of emulsifier at 90°C, then cool at 5°C, add 63g of water for phase inversion emulsification, and obtain milky white Metal cutting fluid defoamer 2.

Embodiment 3

[0050] 20g of hydrogen-containing silicone oil with a hydrogen content of 0.18% and Mn=10000, 48.89g of polyether CH 2 =CHCH 2 O(EO) 6 (PO) 26 OH, 16.30g polyether CH 2 =CHCH 2 O(EO) 5 (PO) 15 OH and 0.0426g of catalyst were added to the reaction flask; nitrogen gas was introduced, and the reaction was carried out at 105°C for 4.5h to obtain colorless and transparent polyether-modified silicone oil 3.

[0051] Stir and mix 16g of silicone grease LAC-003, 22g of polyether co-modified silicone oil 3 and 3g of emulsifier at 85°C, then cool at 8°C, add 59g of water for phase inversion emulsification, and obtain milky white metal cutting liquid defoamer3.

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