CN114949938A - Water-based mineral oil defoaming agent and preparation method thereof - Google Patents
Water-based mineral oil defoaming agent and preparation method thereof Download PDFInfo
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- 239000002480 mineral oil Substances 0.000 title claims abstract description 38
- 235000010446 mineral oil Nutrition 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 27
- 239000002518 antifoaming agent Substances 0.000 title abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 25
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 76
- 229920000570 polyether Polymers 0.000 claims abstract description 76
- 238000003756 stirring Methods 0.000 claims abstract description 76
- 150000002148 esters Chemical class 0.000 claims abstract description 63
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 50
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 25
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 25
- 239000004519 grease Substances 0.000 claims abstract description 24
- 239000003921 oil Substances 0.000 claims abstract description 24
- 235000019198 oils Nutrition 0.000 claims abstract description 24
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 24
- 235000015112 vegetable and seed oil Nutrition 0.000 claims abstract description 23
- 239000008158 vegetable oil Substances 0.000 claims abstract description 23
- 239000013530 defoamer Substances 0.000 claims abstract description 21
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 19
- 239000002562 thickening agent Substances 0.000 claims abstract description 19
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 17
- 238000010008 shearing Methods 0.000 claims abstract description 10
- 229920002545 silicone oil Polymers 0.000 claims abstract description 10
- 230000002421 anti-septic effect Effects 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 239000012467 final product Substances 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 25
- 239000003755 preservative agent Substances 0.000 claims description 15
- 230000002335 preservative effect Effects 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 8
- 239000000047 product Substances 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 claims description 6
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000006555 catalytic reaction Methods 0.000 claims description 6
- 239000007859 condensation product Substances 0.000 claims description 6
- 150000002191 fatty alcohols Chemical class 0.000 claims description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- 239000005639 Lauric acid Substances 0.000 claims description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 2
- 235000021355 Stearic acid Nutrition 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- 150000002170 ethers Chemical class 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 2
- -1 polyoxyethylene Polymers 0.000 claims description 2
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 2
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 2
- 239000008117 stearic acid Substances 0.000 claims description 2
- 239000006260 foam Substances 0.000 abstract description 10
- 230000005764 inhibitory process Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000001804 emulsifying effect Effects 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 125000000217 alkyl group Chemical group 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 10
- 239000000839 emulsion Substances 0.000 description 4
- 241000251468 Actinopterygii Species 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 229940008099 dimethicone Drugs 0.000 description 1
- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
- B01D19/0409—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance compounds containing Si-atoms
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Degasification And Air Bubble Elimination (AREA)
Abstract
The invention aims to provide a water-based mineral oil defoaming agent and a preparation method thereof. Adding vegetable oil and white oil into a stirring container according to the ratio of m to n (3: 5) - (5: 3), sequentially adding a thickening agent, hydrophobic silicon dioxide and mixed silicone grease, raising the temperature to 100-120 ℃, and waiting for the system to be uniformly dispersed; cooling to 80-100 deg.C, adding part of polyether ester No. 1, stirring, adding emulsifier, the rest polyether ester No. 1 and all polyether ester No. 2, stirring to disperse the components uniformly, adding dispersing and leveling agent and antiseptic, stirring, dispersing, and high-speed shearing to obtain the final product. The intersolubility of the mineral oil is increased by controlling the length of a carbon chain of alkyl, the polyether ester No. 1 is modified by silicone oil, the polyether ester is easy to disperse, high in surface activity and strong in defoaming and foam inhibition capacity, and the polyether ester No. 2 is used for emulsifying an integral system to further enhance the water dispersibility of the mineral oil defoamer.
Description
Technical Field
The invention relates to the field of defoaming agents, in particular to a water-based mineral oil defoaming agent and a preparation method thereof.
Background
In the production of the coating, various additives are added to improve the dispersibility of pigments and fillers, the storage stability of products, the appearance of coating films, the workability and the like. These surfactants change the surface tension of the coating, so that the coating is easy to generate foam in the production and construction processes, and the water-based coating is particularly remarkable.
Harm of foam: (1) the production capacity is limited; (2) affecting the quality of the product; (3) waste is caused; (4) the environment is polluted; (5) accidents may be caused.
To eliminate these adverse effects, defoamers have become an indispensable adjuvant in waterborne coatings. The mineral oil defoaming agent in the defoaming agent for the water-based paint accounts for 80 percent of the market share, the mineral oil defoaming agent used at present is various in variety, the mineral oil defoaming agent has poor water solubility, poor defoaming and foam inhibition and diluted floating oil, and when the mineral oil defoaming agent is used, after an emulsifier is separated from the surface of the defoaming agent due to some reasons (such as water is added for diluting before coating), the defoaming agent insoluble in water is easy to cause shrinkage cavities and fish eyes on the surface of a coating film. Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the technical shortcomings, the invention aims to provide an aqueous mineral oil defoaming agent and a preparation method thereof. The defoamer has high temperature resistance, light color, good water dispersibility, difficult generation of fish eyes and shrinkage cavities, and no phenomena of floating oil and emulsion breaking.
The technical scheme of the invention is as follows:
an aqueous mineral oil defoamer, characterized by: the weight percentages of the preparation raw materials are as follows:
white oil: 30-50%
Vegetable oil: 15 to 30 percent of
Mixing silicone grease: 1 to 6 percent
Polyether ester # 1: 5 to 15 percent of
Polyether ester # 2: 5 to 15 percent
Hydrophobic silica: 1 to 5 percent
Emulsifier: proper amount of
Thickening agent: proper amount of
Dispersing leveling agent: proper amount of
Preservative: proper amount of
The total percentage of each component is hundred.
Further, the aqueous mineral oil defoamer is characterized in that: the weight percentages of the preparation raw materials are as follows:
white oil: 30 to 50 percent of
Vegetable oil: 15 to 30 percent of
Mixing silicone grease: 1 to 6 percent
Polyether ester # 1: 5 to 15 percent of
Polyether ester # 2: 5 to 15 percent of
Hydrophobic silica: 1 to 5 percent
Emulsifier: 1 to 5 percent
Thickening agent: 1 to 5 percent
Dispersing leveling agent: proper amount of
Preservative: proper amount of
The total percentage of all the components is hundred.
Further, the preparation method of the water-based mineral oil defoaming agent is characterized by comprising the following steps: adding vegetable oil and white oil into a stirring container according to the ratio of m to n (3: 5) - (5: 3), sequentially adding a thickening agent, hydrophobic silicon dioxide and mixed silicone grease, raising the temperature to 100-120 ℃, and waiting for the system to be uniformly dispersed; cooling to 80-100 deg.C, adding part of polyether ester No. 1, stirring, adding emulsifier, the rest polyether ester No. 1 and all polyether ester No. 2, stirring to disperse the components uniformly, adding dispersing and leveling agent and antiseptic, stirring, dispersing, and high-speed shearing to obtain the final product.
Further, the preparation method of the water-based mineral oil defoaming agent is characterized by comprising the following steps: adding vegetable oil and white oil according to the ratio of m to n (3: 5) to 5: 3) into a heating and stirring container, adding a thickening agent, uniformly stirring, raising the temperature to 100-120 ℃, heating and stirring until the system is uniformly dispersed, adding hydrophobic silicon dioxide, heating and stirring to fully disperse the hydrophobic silicon dioxide, adding mixed silicone grease, heating and stirring to uniformly disperse the mixed silicone grease, then reducing the temperature to 80-100 ℃, adding 30-40% of polyether ester 1#, stirring, adding an emulsifier, continuously stirring, adding the rest polyether ester 1# and all polyether ester 2#, stirring to uniformly disperse the components of the system, adding a dispersing and leveling agent and a preservative, continuously stirring and dispersing, and then transferring to high-speed shearing to obtain the finished product.
Further, the preparation method of the water-based mineral oil defoaming agent is characterized by comprising the following steps: the preparation method of the polyether ester 1# comprises the following steps:
preparing polyether modified silicone oil by using allyl polyether and hydrogen-containing silicone oil under the catalysis of chloroplatinic acid, and preparing polyether ester # 1 by using the polyether modified silicone oil and lauric acid under the catalysis of p-toluenesulfonic acid, wherein the structural formula of the product is as follows:
the allyl polyether used is characterized in that the polyether chain segment is full PO, the molecular weight is between 1000 and 4000, and the structural formula is as follows:
the hydroxyl value of the allyl polyether is about 21-24 mgKOH/g, and the unsaturation degree is more than or equal to 0.3 mmol/g.
Further, the preparation method of the water-based mineral oil defoaming agent is characterized by comprising the following steps: the preparation method of the polyether ester 2# comprises the following steps:
the polyether ester 2# is prepared by using alkylphenol polyoxyethylene ether series or condensation product of fatty alcohol and ethylene oxide, preferably condensation product of fatty alcohol and ethylene oxide and stearic acid under the catalysis of p-toluenesulfonic acid, and the structural formula of the product is as follows:
R 1 ＝C 8 ～C 18
R 2 ＝C 8 ～C 16
n＝3～15
the hydroxyl value of the condensation product of the fatty alcohol and the ethylene oxide is about 89-95 mgKOH/g, and the HLB value is 11-12.
The hydroxyl value of the alkylphenol polyoxyethylene is 68-145 mgKOH/g, and the HLB value is 8-13.
Further, the preparation method of the water-based mineral oil defoaming agent is characterized by comprising the following steps: the weight percentages of the preparation raw materials are as follows:
vegetable oil: 45 to 52 percent of
White oil: 26-32
Mixing silicone grease: 1.2-2.0%
Polyether ester # 1: 5 to 8 percent of
Polyether ester # 2: 8 to 12 percent of
Hydrophobic silica: 1 to 1.5 percent
Emulsifier: proper amount of
Thickening agent: proper amount of
Dispersing leveling agent: proper amount of
Preservative: proper amount of
The total percentage of all the components is hundred.
Further, the preparation method of the water-based mineral oil defoamer is characterized by comprising the following steps: the weight percentages of the preparation raw materials are as follows:
vegetable oil: 48 percent
White oil: 29
Mixing silicone grease: 1.6 percent
Polyether ester # 1: 6.5 percent
Polyether ester # 2: 9.6 percent
Hydrophobic silica: 1.3 percent of
Emulsifier: proper amount of
Thickening agent: proper amount of
Dispersing leveling agent: proper amount of
Preservative: proper amount of
The total percentage of all the components is hundred.
Mixed silicone grease 350cs and 1000cs viscosity dimethicone according to 33: 67 after compounding, accounting for 85-95% of the total mass of the silicon paste, 3-8% of gas phase hydrophobic silicon dioxide and 1-7% of MQ silicon resin, and stirring and reacting at a high speed for 3-8 hours at 130-150 ℃ for preparation) reference: 1 Anhui chemical industry 2020,46(01), the preparation performance of emulsion type flame-retardant fiber organic silicon defoamer is Zhang Jian, Sanyou chemical industry Co., Ltd of Tangshan, 2 organic silicon materials 2018,32(03) the preparation of organic silicon defoamer, and Tibet, Pengyang, Litongning, Luxinqi, and Xichanghao Zhejiang Runshe organic silicon new material Co., Ltd.
According to the invention, vegetable oil and mineral oil are mixed according to the ratio of m (vegetable oil) to n (mineral oil) (3: 5) - (5: 3), the carbon chain length of alkyl is controlled to increase the intersolubility of the mineral oil, and silicone oil modified polyether ester No. 1 is adopted, so that the polyether ester is easy to disperse, high in surface activity and strong in defoaming and foam inhibition capability, and the polyether ester No. 2 is used for emulsifying the whole system to further enhance the water dispersibility of the mineral oil defoamer. The defoaming agent has the advantages of high temperature resistance, light color, good water dispersibility, difficult generation of fish eyes and shrinkage cavities, no floating oil and no emulsion breaking phenomenon.
Detailed Description
The invention provides a water-based mineral oil defoaming agent and a preparation method thereof, and the invention is further explained below in order to make the purpose, effect and technical scheme of the invention more clear.
Example 1
Adding 90g of vegetable oil and 150g of white oil into a heating and stirring container, adding 6g of thickening agent, uniformly stirring, raising the temperature to 100 ℃ plus 120 ℃, heating and stirring for a period of time until the system is uniformly dispersed, adding 4g of hydrophobic silicon dioxide, heating and stirring for a period of time, adding 5g of prepared mixed silicone grease after the hydrophobic silicon dioxide is fully dispersed, heating and stirring for a period of time to uniformly disperse the mixed silicone grease, then reducing the temperature to 80-100 ℃, adding 1/3 into 20g of polyether ester 1#, increasing the stirring speed, stirring for a period of time, adding an emulsifier at the same temperature, continuously stirring for a period of time, adding the rest polyether ester No. 1 and the total polyether ester No. 2 of 30g, accelerating stirring, adding a dispersing and leveling agent and a preservative after uniformly dispersing the components of the system, continuously stirring and dispersing, and transferring into high-speed shearing to obtain the water-based mineral oil defoamer A.
Example 2
Adding 150g of vegetable oil and 90g of white oil into a heating and stirring container, adding 6g of thickening agent, uniformly stirring, raising the temperature to 100 ℃ and 120 ℃, heating and stirring for a period of time, adding 4g of hydrophobic silicon dioxide when the system is uniformly dispersed, heating and stirring for a period of time to fully disperse the hydrophobic silicon dioxide, adding 5g of prepared mixed silicone grease, heating and stirring for a period of time to uniformly disperse the mixed silicone grease, then reducing the temperature to 80-100 ℃, adding 1/3 into 20g of polyether ester 1#, increasing the stirring speed, stirring for a period of time, and adding an emulsifier at the same temperature, continuously stirring for a period of time, adding the rest polyether ester No. 1 and the total polyether ester No. 2 of 30g, accelerating stirring, adding a dispersing and leveling agent and a preservative after uniformly dispersing all components of the system, continuously stirring and dispersing, and transferring into high-speed shearing to obtain the water-based mineral oil defoamer B.
Example 3
Adding 120g of vegetable oil and 120g of white oil into a heating and stirring container, adding 6g of thickening agent, uniformly stirring, raising the temperature to 120 ℃ of 100-, and adding an emulsifier at the same temperature, continuously stirring for a period of time, adding the rest polyether ester No. 1 and the total polyether ester No. 2 of 30g, accelerating stirring, adding a dispersing and leveling agent and a preservative after uniformly dispersing all components of the system, continuously stirring and dispersing, and transferring into high-speed shearing to obtain the water-based mineral oil defoamer C.
Example 4
Adding 90g of vegetable oil and 150g of white oil into a heating and stirring container, adding 6g of thickening agent, uniformly stirring, raising the temperature to 100 ℃ and 120 ℃, heating and stirring for a period of time, adding 4g of hydrophobic silicon dioxide when the system is uniformly dispersed, heating and stirring for a period of time to fully disperse the hydrophobic silicon dioxide, adding 5g of prepared mixed silicone grease, heating and stirring for a period of time to uniformly disperse the mixed silicone grease, then reducing the temperature to 80-100 ℃, adding 1/3 into 10g of polyether ester 1#, increasing the stirring speed, stirring for a period of time, and adding the emulsifier at the same temperature, continuously stirring for a period of time, adding the rest polyether ester 1# and the total 30g of polyether ester 2#, accelerating stirring to uniformly disperse the components of the system, adding the dispersing and leveling agent and the preservative, continuously stirring and dispersing, and transferring into high-speed shearing to obtain the water-based mineral oil defoamer D.
Example 5
Adding 90g of vegetable oil and 150g of white oil into a heating and stirring container, adding 6g of thickening agent, uniformly stirring, raising the temperature to 100 ℃ plus 120 ℃, heating and stirring for a period of time until the system is uniformly dispersed, adding 4g of hydrophobic silicon dioxide, heating and stirring for a period of time, adding 5g of prepared mixed silicone grease after the hydrophobic silicon dioxide is fully dispersed, heating and stirring for a period of time to uniformly disperse the mixed silicone grease, then reducing the temperature to 80-100 ℃, adding 1/3 into 20g of polyether ester 1#, increasing the stirring speed, stirring for a period of time, and adding an emulsifier at the same temperature, continuously stirring for a period of time, adding the rest polyether ester No. 1 and the total 20g of polyether ester No. 2, accelerating stirring, adding a dispersing and leveling agent and a preservative after uniformly dispersing all components of the system, continuously stirring and dispersing, and transferring into high-speed shearing to obtain the water-based mineral oil defoamer E.
Results of the experiment
The defoaming performance, foam inhibition performance and defoaming time of the waterborne mineral oil defoaming agent A-E are compared with those of the commercially available same-type defoaming agents I and II.
(1) Comparison of thermal stability
The defoaming agent is put into an oven with the temperature of 40 ℃, the mixture is kept stand for 72 hours, the layering conditions of the defoaming agent A-E and the commercially available defoaming agents I and II with the same type are respectively observed, and the experimental results are shown in the following table.
TABLE 1
(2) Defoaming/foam suppressing property test
0.3ml of defoaming agent is added into 70g of acrylic emulsion, the mixture is stirred at a high speed for 30min under the condition of 3000r/min, the mixture is poured into a measuring cylinder to measure the volume, and the density is calculated, wherein the higher the density is, the better the defoaming/foam inhibiting performance is.
TABLE 2
Conclusion
The experimental results show that when the ratio of vegetable oil to white oil is 5: 3, the mutual solubility can be effectively increased, the layering phenomenon is reduced, and the characteristics of quick defoaming and strong foam inhibition are simultaneously met; the self-made silicone oil modified polyether ester No. 1 has good dispersibility and defoaming and foam inhibiting capabilities, and the performance of the defoaming agent is remarkably improved along with the increase of the content of the self-made silicone oil modified polyether ester No. 1; the self-made polyether No. 2 has certain emulsifying property, and even if the ratio of the white oil to the vegetable oil is changed, the layering phenomenon can be relieved to a certain extent.
When the components of the formula are 150g of vegetable oil, 90g of white oil, 6g of thickening agent, 4g of hydrophobic silicon dioxide, 5g of prepared mixed silicone grease, 20g of polyether ester No. 1 and 30g of polyether ester No. 2, the performance of the defoaming agent is most excellent.
The defoaming agents A-E and the same type defoaming agents I and II sold in the market are added into the acrylic coating in 1% by mass, and the coating is uniformly coated on a glass plate, so that the coating is smooth and has no shrinkage cavity.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. Modifications and embellishments will occur to those skilled in the art, and such modifications and embellishments should also be considered within the scope of the present invention.
Claims (8)
1. An aqueous mineral oil defoamer, characterized by: the weight percentage of the preparation raw materials is as follows:
white oil: 30 to 50 percent of
Vegetable oil: 15 to 30 percent of
Mixing silicon paste: 1 to 6 percent
Polyether ester # 1: 5 to 15 percent of
Polyether ester # 2: 5 to 15 percent of
Hydrophobic silica: 1 to 5 percent
Emulsifier: proper amount of
Thickening agent: proper amount of
Dispersing leveling agent: proper amount of
Preservative: proper amount of
The total percentage of all the components is hundred.
2. The aqueous mineral oil defoamer as set forth in claim 1, characterized in that: the weight percentage of the preparation raw materials is as follows:
white oil: 30 to 50 percent of
Vegetable oil: 15 to 30 percent of
Mixing silicone grease: 1 to 6 percent
Polyether ester # 1: 5 to 15 percent of
Polyether ester # 2: 5 to 15 percent of
Hydrophobic silica: 1 to 5 percent
Emulsifier: 1 to 5 percent
Thickening agent: 1 to 5 percent
Dispersing leveling agent: proper amount of
Preservative: proper amount of
The total percentage of all the components is hundred.
3. The method of preparing an aqueous mineral oil defoamer as claimed in claim 1 or 2, wherein: adding vegetable oil and white oil into a stirring container according to the ratio of m to n (3: 5) - (5: 3), sequentially adding a thickening agent, hydrophobic silicon dioxide and mixed silicone grease, raising the temperature to 100-120 ℃, and waiting for the system to be uniformly dispersed; cooling to 80-100 deg.C, adding part of polyether ester No. 1, stirring, adding emulsifier, the rest polyether ester No. 1 and all polyether ester No. 2, stirring to disperse the components uniformly, adding dispersing and leveling agent and antiseptic, stirring, dispersing, and high-speed shearing to obtain the final product.
4. The method of claim 3, wherein the aqueous mineral oil defoamer is prepared by: adding vegetable oil and white oil according to the ratio of m to n (3: 5) to 5: 3) into a heating and stirring container, adding a thickening agent, uniformly stirring, raising the temperature to 100-120 ℃, heating and stirring until the system is uniformly dispersed, adding hydrophobic silicon dioxide, heating and stirring to fully disperse the hydrophobic silicon dioxide, adding mixed silicone grease, heating and stirring to uniformly disperse the mixed silicone grease, then reducing the temperature to 80-100 ℃, adding 30-40% of polyether ester 1#, stirring, adding an emulsifier, continuously stirring, adding the rest polyether ester 1# and all polyether ester 2#, stirring to uniformly disperse the components of the system, adding a dispersing and leveling agent and a preservative, continuously stirring and dispersing, and then transferring to high-speed shearing to obtain the finished product.
5. The method of claim 3, wherein the aqueous mineral oil defoamer is prepared by: the preparation method of the polyether ester 1# comprises the following steps:
preparing polyether modified silicone oil by using allyl polyether and hydrogen-containing silicone oil under the catalysis of chloroplatinic acid, and preparing polyether ester # 1 by using the polyether modified silicone oil and lauric acid under the catalysis of p-toluenesulfonic acid, wherein the structural formula of the product is as follows:
the allyl polyether used is characterized in that the polyether chain segment is full PO, the molecular weight is between 1000 and 4000, and the structural formula is as follows:
the hydroxyl value of the allyl polyether is about 21-24 mgKOH/g, and the unsaturation degree is more than or equal to 0.3 mmol/g.
6. The method of claim 3, wherein the aqueous mineral oil defoamer is prepared by: the preparation method of the polyether ester 2# comprises the following steps:
the polyether ester 2# is prepared by using alkylphenol polyoxyethylene ether series or condensation product of fatty alcohol and ethylene oxide, preferably condensation product of fatty alcohol and ethylene oxide and stearic acid under the catalysis of p-toluenesulfonic acid, and the structural formula of the product is as follows:
R 1 ＝C 8 ～C 18
R 2 ＝C 8 ～C 16
n＝3～15
the hydroxyl value of the condensation product of the fatty alcohol and the ethylene oxide is about 89-95 mgKOH/g, and the HLB value is 11-12.
The hydroxyl value of the alkylphenol polyoxyethylene is 68-145 mgKOH/g, and the HLB value is 8-13.
7. The method of claim 1, wherein the aqueous mineral oil defoamer is prepared by: the weight percentages of the preparation raw materials are as follows:
vegetable oil: 45 to 52 percent of
White oil: 26-32
Mixing silicone grease: 1.2-2.0%
Polyether ester # 1: 5 to 8 percent of
Polyether ester # 2: 8 to 12 percent of
Hydrophobic silica: 1 to 1.5 percent
Emulsifier: proper amount of
Thickening agent: proper amount of
Dispersing leveling agent: proper amount of
Preservative: proper amount of
The total percentage of all the components is hundred.
8. The method of claim 1, wherein the aqueous mineral oil defoamer is prepared by: the weight percentages of the preparation raw materials are as follows:
vegetable oil: 48 percent
White oil: 29
Mixing silicone grease: 1.6 percent
Polyether ester # 1: 6.5 percent
Polyether ester # 2: 9.6 percent
Hydrophobic silica: 1.3 percent of
Emulsifier: proper amount of
Thickening agent: proper amount of
Dispersing leveling agent: proper amount of
Preservative: proper amount of
The total percentage of all the components is hundred.
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