Mineral oil defoaming agent

Abstract

According to the preparation method, high-hydrogen-content polysiloxane, vinyl polysiloxane with high vinyl content and olefin react under the action of a platinum catalyst to form solid organic silicon, and the solid organic silicon is finally ground to form organic silicon solid powder; the organic silicon solid powder is obtained through reaction of hydrogen-containing polysiloxane containing high-activity groups, vinyl polysiloxane and olefin, the molecular structure has high compactness, the defoaming and foam inhibition performance of the defoaming agent is greatly improved, and meanwhile, the organic silicon solid powder can be fully dispersed and dissolved in a vegetable oil carrier as a defoaming auxiliary, so that the defoaming effect is good. The problem of layering caused by introduction of other solid defoaming particles into the carrier oil is solved, and the stability and compatibility of the defoaming agent are improved.

Description

Technical Field

[0001] The invention relates to a mineral oil defoamer, which belongs to a fine chemical additive. Therefore, the invention belongs to the technical field of fine chemical industry. Background Art

[0002] As a kind of fine chemical, defoamer is widely used in various industries. The use of defoamer not only needs to meet its own stability and good defoaming and defoaming performance, but also needs to meet the requirements of good compatibility with the foaming system. At present, the defoamers used in the coatings, inks and adhesives industries are mainly silicone and mineral oil. However, silicone products are not compatible with water-based systems and are prone to cause problems such as shrinkage holes and edge shrinkage in the coating. Mineral oil defoamers are mainly composed of mineral oil as a carrier, combined with other defoaming additives and surfactants. They have good dispersibility in water-based systems and are more compatible than silicone defoamers.

[0003] Currently, the commonly used mineral oil defoamers mostly use base oil extracted from petroleum by physical distillation as a carrier, which has the problem of too high VOC and will cause harm to the environment: for example, CN101991975A uses mineral oil as a carrier, and chooses to add fatty acid metal soap and fatty acid amide at the same time, which improves the stability of the product while further improving the defoaming performance. As the defoaming performance and stability of the product are improved; CN102489049A uses mineral oil as a carrier, combined with fatty acid metal soap, white carbon black and other defoaming aids, and controls the viscosity change of the product by changing the material addition method in the production process, so as to prepare a mineral oil defoamer with excellent defoaming performance and compatibility.

[0004] As the requirements of environmental protection laws and regulations are increasingly valued, technicians in this field have begun to study natural oils as carriers to prepare oil defoamers. CN104479439B introduces the introduction of vegetable oils and their derivatives and mineral oils into an alkyl silicone oil and silicon dioxide system. By controlling the average number of carbon atoms of the alkyl silicone oil, the alkyl silicone oil is well miscible with the mineral oil, and the ratio of mineral oil to vegetable oil and its derivatives is controlled between 1:6 and 4:7. Ultimately, the problems of shrinkage cavities, edge shrinkage, and depressions in the coating film are effectively solved, while also improving the defoaming and antifoaming performance and stability of the defoamer. However, some existing mineral oil carriers still do not solve the VOC problem of the product. The document "Modification of soybean oil and its application in defoamers" "Application in Foaming Agents" introduces that the compounding of mineral oil and soybean oil within a certain range improves the stability of the defoaming agent system, but the defoaming and anti-foaming performance of the product needs to be improved; CN105983252A uses vegetable oil, fatty acid amide, fatty acid metal soap, white carbon black, emulsifier, and defoaming aid as raw materials to synthesize a renewable and degradable environmentally friendly defoaming agent, but the fatty acid metal soap in the product cannot swell in the vegetable oil, which ultimately leads to the problem of poor product stability. At the same time, the selection of polysiloxane defoaming aids will make the compatibility of the product worse; CN107141874A introduces amide-modified hydrogenated castor oil anti-settling agent to solve the temperature adaptability problem of hydrogenated castor oil. However, there is no document or patent indicating that the coarse particles of amide-modified hydrogenated castor oil can be made to have the ability to defoam and suppress foam through a special process. CN108786189A uses vegetable oil and its derivatives as carriers, white carbon black and fatty acid metal soaps as the main defoaming substances of the defoaming agent, and introduces hydrogenated castor oil substances. Through a special process, the defoaming and suppressing performance is guaranteed while the product stability is guaranteed, and the problem of particle stratification caused by the inability of fatty acid metal soaps to swell is solved. Summary of the invention

[0005] In the present invention, high hydrogen-containing polysiloxane, high vinyl content vinyl polysiloxane and olefin react under the action of a platinum catalyst to form solid organosilicon, which is finally ground to form organosilicon solid powder; the organosilicon solid powder is obtained by reacting hydrogen-containing polysiloxane containing high active groups, vinyl polysiloxane and olefin, and has a high density in the molecular structure, which greatly improves the defoaming and defoaming performance of the defoamer; at the same time, as a defoaming auxiliary agent, the organosilicon solid powder can be fully dispersed and dissolved in a vegetable oil carrier, which solves the stratification problem caused by the introduction of other solid defoaming particles into the carrier oil, and improves the stability and compatibility of the defoamer.

[0006] A mineral oil defoamer, comprising the following components: A. Carrier The carrier is selected from one or a mixture of vegetable oils and vegetable oil derivatives, wherein the vegetable oil is selected from one or a mixture of castor oil, soybean oil, palm oil, rapeseed oil, linseed oil, and peanut oil; the vegetable oil derivative is selected from one or a mixture of epoxidized compounds of vegetable oils and amidated compounds of vegetable oils, and the amount of the carrier accounts for 70-90% of the total mass of the mineral oil defoamer; B. Silicone solid powder The organosilicon solid powder is prepared by reacting a high hydrogen-containing polyorganosiloxane B1, a high vinyl-content vinyl polysiloxane B2, and an olefin B3 under the action of a platinum catalyst B4 to form a solid organosilicon composition, and finally grinding the solid organosilicon powder; the amount of the organosilicon powder accounts for 1-15% of the total mass of the mineral oil defoamer; The general structural formula of high hydrogen-containing polyorganosiloxane B1 is as follows: H c R 1 3-c SiO(SiR 1 HO) d (SiR 1 2O) b S i 1 3-c H c R 1 is an alkyl group having 1 to 5 carbon atoms, which may be the same or different; subscript c is 0, 1 or 2, subscript d is an integer of 100 to 300; subscript b is an integer of 50 to 1600; the hydrogen content of the high hydrogen-containing polysiloxane is ≥ 0.1%; the amount used accounts for 10-45% of the total mass of the organosilicon solid powder; The general structure of high vinyl content vinyl polysiloxane B2 is as follows: Vi e R 2 3-e SiO(SiR 2 ViO) f (SiR 2 2O) g S i 2 3-e Vi e R 2 The value range is similar to R 1 The same; Vi is vinyl, subscript e is 0 or 1, subscript f is 30-80; subscript g is 20-80; the molecular weight of high vinyl content vinyl polysiloxane B2 is less than 10000; the amount used accounts for 40-70% of the total mass of the organosilicon solid powder; The structural formula of olefin B3 is CH2=CH(CH2) nH, where: subscript n is an integer of 6-18, and the amount used accounts for 10-30% of the total mass of the organosilicon solid powder; Platinum catalyst B4 is selected from platinum-alcohol complexes, platinum-olefin complexes, platinum-alkoxide complexes, platinum-ether complexes, platinum-ketone complexes, chloroplatinic acid isopropanol solution, and platinum-vinyl complexes; the amount used is 0.01%-0.05% of the total mass of the high hydrogen-containing polysiloxane, high vinyl content vinyl polysiloxane and olefin.

[0007] C. Vegetable oil polyether fatty acid ester The vegetable oil polyether fatty acid ester is selected from castor oil polyoxyethylene polyoxypropylene ether oleate, soybean oil polyoxyethylene polyoxypropylene ether oleate, castor oil polyoxyethylene polyoxypropylene ether stearate, soybean oil polyoxyethylene polyoxypropylene ether stearate, castor oil polyethylene glycol oleate, castor oil polyethylene glycol stearate; the amount of vegetable oil polyether fatty acid ester accounts for 5-15% of the total mass of the mineral oil defoamer D. Emulsifier The emulsifier is a nonionic surfactant selected from one or more mixtures of fatty alcohol polyoxyethylene ether, fatty acid polyoxyethylene ether, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan trioleate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, and sorbitan trioleate. The amount of the emulsifier is 2-15% of the total mass of the defoamer.

[0008] A preparation method of a mineral oil defoamer is as follows: 1. Mix a specified amount of high hydrogen polysiloxane, high vinyl content vinyl polysiloxane and olefin, add a platinum catalyst at 40°C to 90°C, then heat to 50°C to 200°C for reaction for 1 to 6 hours, and cool to room temperature to obtain organosilicon powder solid E; 2. Mix and stir the carrier accounting for 30-70% of the total mass of the carrier and the organosilicon powder solid, disperse and heat at a high speed, the speed is 1500-2500 rpm, the temperature is raised to 100-160° C., and stir evenly to obtain a mixture M; 3. Mix and stir the carrier accounting for 30-70% of the total mass of the carrier and the vegetable oil polyether fatty acid ester, disperse and heat at a high speed of 1000-2000 rpm, heat to 40-80° C., and stir evenly to obtain a mixture N; 4. Add mixture M and mixture N into a container and start stirring. Stir at room temperature to make the system evenly dispersed, then heat to 40-60°C, add emulsifier while continuing to stir, and finally stir evenly to obtain the mineral oil defoamer. DETAILED DESCRIPTION Example 1

[0010] 1. 100g high hydrogen polysiloxane H2MeSiO (SiMeHO) 130 (SiMe2O) 1600 SiMeH2, 600g high vinyl content vinyl polysiloxane Me3SiO (SiMeViO) 30 (SiMe2O) 80 SiMe3 and 300g CH2=CH(CH2)6H were mixed, 0.1g chloroplatinic acid isopropanol solution was added at 40°C, then the temperature was raised to 50°C for reaction for 6h, and the temperature was lowered to room temperature to obtain organosilicon powder solid E1; 2. Mix 21 g of castor oil and 15 g of organosilicon powder solid E1, stir and disperse at high speed, heat at a speed of 1500 rpm, heat to 100° C., and stir evenly to obtain a mixture M1; 3. Mix 49 g of castor oil and 13 g of castor oil polyoxyethylene polyoxypropylene ether oleate, stir and disperse at high speed, heat at a speed of 1000 rpm, heat to 60° C., and stir evenly to obtain a mixture N1; 4. Add mixture M1 and mixture N1 into a container and start stirring. Stir at room temperature until the system is evenly dispersed, then raise the temperature to 40°C, add 2 g of fatty alcohol polyoxyethylene ether while continuing to stir, and finally stir evenly to obtain the mineral oil defoamer. Example 2

[0011] 1. 100g high hydrogen polysiloxane H3SiO[Si(C2H5)HO)] 150 [(SiMe(C2H5)O)] 1000 SiH3, 700g high vinyl content vinyl polysiloxane ViMe2SiO (SiMeViO) 80 (SiMe2O) 20 SiViMe2 and 200g CH2=CH(CH2)8H were mixed, 0.2g of platinum-alcohol complex was added at 50°C, then the temperature was raised to 80°C for reaction for 5h, and the temperature was lowered to room temperature to obtain organosilicon powder solid E2; 2. Mix 32g soybean oil and 8g organosilicon powder solid E2, stir and disperse at high speed, heat at a speed of 1800rpm, heat to 115°C, and stir evenly to obtain a mixture M2; 3. Mix 48 g soybean oil and 5 g soybean oil polyoxyethylene polyoxypropylene ether oleate, stir and disperse at high speed, heat at a speed of 1200 rpm, heat to 80° C., stir evenly to obtain a mixture N2; 4. Add mixture M2 and mixture N2 into a container and start stirring. Stir at room temperature to make the system evenly dispersed, then heat to 45°C, add 7g of fatty acid polyoxyethylene ether under continuous stirring, and finally stir evenly to obtain the mineral oil defoamer. Example 3

[0012] 1. 200g high hydrogen polysiloxane H (Me)(C3H7)SiO[Si(C3H7)HO)] 200 [(SiMe(C3H7)O)] 800 Si(Me)2H, 700g high vinyl content vinyl polysiloxane (C2H5)2(C3H7)SiO[Si(C2H5)ViO] 40 [Si(C2H5)2(C3H7)O] 40 Si(C2H5)2(C3H7), 100gCH2=CH(CH2) 10 H, add 0.3 g of platinum-olefin complex at 60°C, then heat to 110°C for 4 h, and cool to room temperature to obtain organosilicon powder solid E3; 2. Mix 45 g palm oil and 1 g organosilicon powder solid E3, stir and disperse at high speed, heat at a speed of 2000 rpm, heat to 130°C, and stir evenly to obtain a mixture M3; 3. Mix 45 g of palm oil, 5 g of castor oil polyoxyethylene polyoxypropylene ether stearate and soybean oil polyoxyethylene polyoxypropylene ether stearate, stir and disperse at high speed, heat at a speed of 1400 rpm, heat to 70° C., and stir to obtain mixture N3; 4. Add mixture M3 and mixture N3 into a container and start stirring. After stirring at room temperature to make the system evenly dispersed, heat it to 50°C, add 4g of a mixture of polyoxyethylene sorbitan monolaurate and polyoxyethylene sorbitan monopalmitate under continuous stirring, and finally stir evenly to obtain the mineral oil defoamer. Example 4

[0013] 1. 400g of high hydrogen-containing polysiloxane (C4H9)2(C3H7)SiO[Si(C3H7)HO)] 300 [(SiMe(C3H7)O)] 500 Si(C4H9)(C3H7)2, 400g high vinyl content vinyl polysiloxane Vi(C4H9)2SiO[Si(C4H9)ViO] 20 [Si(C2H5)2(C4H9)O] 15 Si(C4H9)2Vi, 200gCH2=CH(CH2) 14H, add 0.4 g of platinum-alkoxide complex at 70°C, then heat to 150°C for reaction for 3 h, and cool to room temperature to obtain organosilicon powder solid E4; 2. 42 g of rapeseed oil and 13 g of organosilicon powder solid E4 were mixed and stirred, and then dispersed and heated at a high speed of 2200 rpm to 140° C. and stirred evenly to obtain a mixture M4; 3. Mix 28 g of palm oil, 15 g of castor oil polyethylene glycol oleate and castor oil polyethylene glycol stearate, stir and disperse at high speed, heat at a speed of 1600 rpm, heat to 60° C., and stir evenly to obtain a mixture N4; 4. Add mixture M4 and mixture N4 into a container and start stirring. After stirring at room temperature to make the system evenly dispersed, heat it to 55°C, add 2g of polyoxyethylene sorbitan monostearate and polyoxyethylene sorbitan monooleate mixture under continuous stirring, and finally stir evenly to obtain the mineral oil defoamer. Example 5

[0014] 1. Add 250g of high hydrogen polysiloxane H2(C5H 11 )SiO[Si(CH3)HO)] 250 [(SiMe2O)] 200 Si(C5H 11 )H2, 550g high vinyl content vinyl polysiloxane (C5H 11 )3SiO[Si(Me)ViO] 15 [Si(C5H 11 )(Me)O] 10 Si(C5H 11 )3, 200gCH2=CH(CH2) 18 H, add 0.5 g of platinum-ether complex at 80°C, then heat to 180°C for 2 h, and cool to room temperature to obtain organosilicon powder solid E5; 2. Mix 60 g peanut oil and 3 g organosilicon powder solid E5, stir and disperse at high speed, heat at a speed of 2400 rpm, heat to 150°C, and stir evenly to obtain a mixture M5; 3. Mix 18 g peanut oil and 7 g castor oil polyethylene glycol oleate, stir and disperse at high speed, heat at a speed of 1800 rpm, heat to 50° C., and stir evenly to obtain a mixture N5; 4. Add mixture M5 and mixture N5 into a container and start stirring. After stirring at room temperature to make the system evenly dispersed, heat it to 60°C, add 15g of a mixture of polyoxyethylene sorbitan trioleate and sorbitan monolaurate under continuous stirring, and finally stir evenly to obtain the mineral oil defoamer. Example 6

[0015] 1. 250g high hydrogen polysiloxane H3SiO[Si(CH3)HO)] 300 [(SiMe2O)] 50 SiH3, 650g high vinyl content vinyl polysiloxane ViMe2SiO[Si(Me)ViO] 60 [Si(Me)2O] 60 SiMe2Vi, 100gCH2=CH(CH2) 12 H, add 0.25 g of platinum-ketone complex at 90°C, then heat to 200°C for 1 h, and cool to room temperature to obtain organosilicon powder solid E6; 2. Mix 36 g of epoxidized soybean oil and 10 g of organosilicon powder solid E6, stir and disperse at high speed, heat at a speed of 2500 rpm, heat to 160°C, and stir evenly to obtain a mixture M6; 3. Mix 36 g of arachidyl oleamide and 8 g of castor oil polyethylene glycol stearate, stir and disperse at high speed, heat at a speed of 2000 rpm, heat to 40° C., and stir evenly to obtain a mixture N6; 4. Add mixture M6 and mixture N6 into a container and start stirring. After stirring at room temperature to make the system evenly dispersed, heat it to 50°C, add 10g of a mixture of sorbitan monopalmitate and sorbitan monostearate under continuous stirring, and finally stir evenly to obtain the mineral oil defoamer.

[0016] Comparative Example 1 1. 100g hydrogen-containing polyorganosiloxane H2MeSiO (SiMeHO) 100 (SiMe2O) 1600 SiMeH2, 600g high vinyl content vinyl polysiloxane Me3SiO (SiMeViO) 30 (SiMe2O) 80 SiMe3 and 300g CH2=CH(CH2)6H were mixed, 0.1g chloroplatinic acid isopropanol solution was added at 40°C, then the temperature was raised to 50°C for reaction for 6h, and the temperature was lowered to room temperature to obtain organosilicon powder solid E7; 2. Mix 21 g of castor oil and 15 g of organosilicon powder solid E7, stir and disperse at high speed, heat at a speed of 1500 rpm, heat to 100° C., and stir evenly to obtain a mixture M7; 3. Mix 49 g of castor oil and 13 g of castor oil polyoxyethylene polyoxypropylene ether oleate, stir and disperse at high speed, heat at a speed of 1000 rpm, heat to 60° C., and stir evenly to obtain a mixture N1; 4. Add mixture M7 and mixture N1 into a container and start stirring. Stir at room temperature until the system is evenly dispersed, then raise the temperature to 40°C, add 2 g of fatty alcohol polyoxyethylene ether while continuing to stir, and finally stir evenly to obtain the mineral oil defoamer.

[0017] Comparative Example 2 1. 100g hydrogen-containing polyorganosiloxane H3SiO[Si(C2H5)HO)] 50 [(SiMe(C2H5)O)] 1000 SiH3, 700g high vinyl content vinyl polysiloxane ViMe2SiO (SiMeViO) 80 (SiMe2O) 20 SiViMe2 and 200g CH2=CH(CH2)8H were mixed, 0.2g of platinum-alcohol complex was added at 50°C, then the temperature was raised to 80°C for reaction for 5h, and the temperature was lowered to room temperature to obtain organosilicon powder solid E8; 2. Mix 32g soybean oil and 8g organosilicon powder solid E8, stir and disperse at high speed, heat at a speed of 1800rpm, heat to 115°C, and stir evenly to obtain a mixture M8; 3. Mix 48 g soybean oil and 5 g soybean oil polyoxyethylene polyoxypropylene ether oleate, stir and disperse at high speed, heat at a speed of 1200 rpm, heat to 80° C., stir evenly to obtain a mixture N2; 4. Add mixture M8 and mixture N2 into a container and start stirring. Stir at room temperature to make the system evenly dispersed, then raise the temperature to 45°C, add 7g of fatty acid polyoxyethylene ether under continuous stirring, and finally stir evenly to obtain the mineral oil defoamer.

[0018] Comparative Example 3 1. 200g high hydrogen polysiloxane H (Me)(C3H7)SiO[Si(C3H7)HO)] 200 [(SiMe(C3H7)O)] 800 Si(Me)2H, 700g high vinyl content vinyl polysiloxane (C2H5)2(C3H7)SiO[Si(C2H5)ViO] 80 [Si(C2H5)2(C3H7)O] 40 Si(C2H5)2(C3H7), 100gCH2=CH(CH2) 10 H, add 0.3 g of platinum-olefin complex at 60°C, then heat to 110°C for 4 h, and cool to room temperature to obtain organosilicon powder solid E9; 2. Mix 45g of palm oil and 1g of organosilicon powder solid E9, stir and disperse at high speed, heat at a speed of 2000rpm, heat to 130°C, and stir evenly to obtain a mixture M9; 3. Mix 45 g of palm oil, 5 g of castor oil polyoxyethylene polyoxypropylene ether stearate and soybean oil polyoxyethylene polyoxypropylene ether stearate, stir and disperse at high speed, heat at a speed of 1400 rpm, heat to 70° C., and stir to obtain mixture N3; 4. Add mixture M9 and mixture N3 into a container and start stirring. After stirring at room temperature to make the system evenly dispersed, heat it to 50°C, add 4g of a mixture of polyoxyethylene sorbitan monolaurate and polyoxyethylene sorbitan monopalmitate under continuous stirring, and finally stir evenly to obtain the mineral oil defoamer.

[0019] Comparative Example 4 1. 400g of high hydrogen-containing polysiloxane (C4H9)2(C3H7)SiO[Si(C3H7)HO)] 300 [(SiMe(C3H7)O)] 500 Si(C4H9)(C3H7)2, 400g high vinyl content vinyl polysiloxane Vi(C4H9)2SiO[Si(C4H9)ViO] 70 [Si(C2H5)2(C4H9)O] 15 Si(C4H9)2Vi, 200gCH2=CH(CH2) 14 H, add 0.4g of platinum-alkoxide complex at 70°C, then heat to 150°C for reaction for 3h, and cool to room temperature to obtain organosilicon powder solid E10; 2. Mix 42g of rapeseed oil and 13g of organosilicon powder solid E10, stir and disperse at high speed, heat at a speed of 2200rpm, heat to 140°C, stir evenly to obtain mixture M10; 3. Mix 28 g of palm oil, 15 g of castor oil polyethylene glycol oleate and castor oil polyethylene glycol stearate, stir and disperse at high speed, heat at a speed of 1600 rpm, heat to 60° C., and stir evenly to obtain a mixture N4; 4. Add mixture M10 and mixture N4 into a container and start stirring. After stirring at room temperature to make the system evenly dispersed, heat it to 55°C, add 2g of polyoxyethylene sorbitan monostearate and polyoxyethylene sorbitan monooleate mixture under continuous stirring, and finally stir evenly to obtain the mineral oil defoamer.

[0020] Comparative Example 5 1. Add 250g of high hydrogen polysiloxane H2(C5H 11 )SiO[Si(CH3)HO)]250 [(SiMe2O)] 200 Si(C5H 11 )H2, 550g high vinyl content vinyl polysiloxane (C5H 11 )3SiO[Si(Me)ViO] 15 [Si(C5H 11 )(Me)O] 10 Si(C5H 11 )3, 200gCH2=CH(CH2) 18 H, add 0.5 g of platinum-ether complex at 80°C, then heat to 180°C for 2 h, and cool to room temperature to obtain organosilicon powder solid E5; 2. Mix 78 g peanut oil, 3 g organosilicon powder solid E5 and 7 g castor oil polyethylene glycol oleate, stir and disperse at high speed, heat at a speed of 2400 rpm, heat to 150° C., and stir evenly to obtain a mixture N7; 3. Add the mixture N7 into a container and start stirring. Heat it to 60° C., add 15 g of a mixture of polyoxyethylene sorbitan trioleate and sorbitan monolaurate under continuous stirring, and finally stir evenly to obtain the mineral oil defoamer.

[0021] Comparative Example 6 1. 300g high hydrogen polysiloxane H3SiO[Si(CH3)HO)] 300 [(SiMe2O)] 50 SiH3, 700g high vinyl content vinyl polysiloxane ViMe2SiO[Si(Me)ViO] 60 [Si(Me)2O] 60 SiMe2Vi was mixed, 0.25 g of platinum-ketone complex was added at 90°C, then the temperature was raised to 200°C for reaction for 1 hour, and the temperature was lowered to room temperature to obtain organosilicon powder solid E11; 2. Mix 36 g of epoxy soybean oil and 10 g of organosilicon powder solid E11, stir and disperse at high speed, heat at a speed of 2500 rpm, heat to 160° C., and stir evenly to obtain a mixture M11; 3. Mix 36 g of arachidyl oleamide and 8 g of castor oil polyethylene glycol stearate, stir and disperse at high speed, heat at a speed of 2000 rpm, heat to 40° C., and stir evenly to obtain a mixture N6; 4. Add mixture M11 and mixture N6 into a container and start stirring. After stirring at room temperature to make the system evenly dispersed, heat it to 50°C, add 10g of a mixture of sorbitan monopalmitate and sorbitan monostearate under continuous stirring, and finally stir evenly to obtain the mineral oil defoamer.

[0022] Test method: (1) Anti-foaming performance test Test method: Add 200g of self-prepared water-based paint into a 1000ml stainless steel cup, then add 0.3% defoamer, use a laboratory high-speed disperser to disperse at a speed of 1000rpm for 10 minutes, pour into a 1000ml measuring cylinder immediately after stopping, record the weight and volume of the liquid, calculate the specific gravity, and a large specific gravity value indicates a small air content, indicating that the defoamer has good anti-foaming performance.

[0023] (2) Compatibility test Test method: After the high-speed dispersed coating is placed for 10 minutes, take out a small amount and place it on a glass plate. Use a 75um wet film preparation device to scrape the coating at a uniform speed, observe the state of the coating, and express it in grades. The higher the rating, the better the compatibility.

[0024] Coating grade classification

[0025] (3) The stability of the sample was tested using a Formulaction / Turbiscan Tower / Multiple Light Scattering Stability Analyzer at a test temperature of 40°C and a sample size of 20 g. The smaller the TSI index in the test results, the better the sample stability.

[0026] The test results are as follows: 1. Test results of foam suppression performance:

[0027] 2. Compatibility test results:

[0028] 3. Stability test results:

Claims

1. A mineral oil defoamer, characterized in that It is composed of the following substances: A. Carrier The carrier is selected from one or a mixture of vegetable oils and vegetable oil derivatives, wherein the vegetable oil is selected from one or a mixture of castor oil, soybean oil, palm oil, rapeseed oil, linseed oil, and peanut oil; the vegetable oil derivative is selected from one or a mixture of epoxidized compounds of vegetable oils and amidated compounds of vegetable oils, and the amount of the carrier accounts for 70-90% of the total mass of the mineral oil defoamer; the carrier oil is used in two parts; B. Silicone solid powder The organosilicon solid powder is obtained by reacting a high hydrogen polysiloxane B1, a high vinyl content vinyl polysiloxane B2, and an olefin B3 under the action of a platinum catalyst B4 to form a solid organosilicon composition, and finally grinding the solid organosilicon powder; the amount of the organosilicon powder accounts for 1-15% of the total mass of the mineral oil defoamer; C. Vegetable oil polyether fatty acid ester The vegetable oil polyether fatty acid ester is selected from castor oil polyoxyethylene polyoxypropylene ether oleate, soybean oil polyoxyethylene polyoxypropylene ether oleate, castor oil polyoxyethylene polyoxypropylene ether stearate, soybean oil polyoxyethylene polyoxypropylene ether stearate, castor oil polyethylene glycol oleate, castor oil polyethylene glycol stearate; the amount of vegetable oil polyether fatty acid ester accounts for 5-15% of the total mass of the mineral oil defoamer; D. Emulsifier The emulsifier is a nonionic surfactant selected from one or more mixtures of fatty alcohol polyoxyethylene ether, fatty acid polyoxyethylene ether, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan trioleate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, and sorbitan trioleate. The amount of the emulsifier is 2-15% of the total mass of the defoamer.

2. A mineral oil defoamer according to claim 1, characterized in that: The general structural formula of the high hydrogen-containing polyorganosiloxane B1 is as follows: H c R 1 3-c SiO(SiR 1 HO) d (SiR 1 2O) b SiR 1 3-c H c R1 is an alkyl group with 1 to 5 carbon atoms, which may be the same or different; subscript c is 0, 1 or 2, subscript d is an integer of 100 to 300; subscript b is an integer of 50 to 1600; the hydrogen content of the high hydrogen polysiloxane is ≥ 0.1%; and the dosage accounts for 10-45% of the total mass of the organosilicon solid powder.

3. A mineral oil defoamer according to claim 1, characterized in that: The general structural formula of the high vinyl content vinyl polysiloxane B2 is as follows: Vi e R 2 3-e SiO(SiR 2 ViO) f (SiR 2 2O) g SiR 2 3-e Vi e R 2 The value range is similar to R 1 The same; Vi is vinyl, subscript e is 0 or 1, subscript f is 30-80; subscript g is 20-80; the molecular weight of the high vinyl content vinyl polysiloxane B2 is less than 10000; the amount used accounts for 40-70% of the total mass of the organic silicon solid powder.

4. A mineral oil defoamer as claimed in claim 1, characterized in that: The structural formula of the olefin B3 is CH2=CH(CH2) n H, wherein: subscript n is an integer of 6-18, and the amount used accounts for 10-30% of the total mass of the organic silicon solid powder.

5. A mineral oil defoamer as claimed in claim 1, characterized in that: The platinum catalyst B4 is selected from platinum-alcohol complexes, platinum-olefin complexes, platinum-alkoxide complexes, platinum-ether complexes, platinum-ketone complexes, chloroplatinic acid isopropanol solution, and platinum-vinyl complexes; the amount used is 0.01%-0.05% of the total mass of the high hydrogen-containing polysiloxane and the high vinyl content vinyl polysiloxane.

6. The mineral oil defoamer according to any one of claims 1 to 5, prepared by the following method:

1. Mix a specified amount of high hydrogen polysiloxane, high vinyl content vinyl polysiloxane and olefin, add a platinum catalyst at 40°C to 90°C, then heat to 50°C to 200°C for reaction for 1 to 6 hours, and cool to room temperature to obtain organosilicon powder solid E; 2. Mix and stir the carrier accounting for 30-70% of the total mass of the carrier and the organosilicon powder solid, disperse and heat at a high speed, the speed is 1500-2500 rpm, the temperature is raised to 100-160° C., and stir evenly to obtain a mixture M; 3. Mix and stir the carrier accounting for 30-70% of the total mass of the carrier and the vegetable oil polyether fatty acid ester, disperse and heat at a high speed of 1000-2000 rpm, heat to 40-80° C., and stir evenly to obtain a mixture N; 4. Add mixture M and mixture N into a container and start stirring. Stir at room temperature to make the system evenly dispersed, then heat to 40-60°C, add emulsifier while continuing to stir, and finally stir evenly to obtain the mineral oil defoamer.

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