CN117643746A - Modified organic silicon defoamer and preparation method thereof - Google Patents
Modified organic silicon defoamer and preparation method thereof Download PDFInfo
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- CN117643746A CN117643746A CN202311718421.3A CN202311718421A CN117643746A CN 117643746 A CN117643746 A CN 117643746A CN 202311718421 A CN202311718421 A CN 202311718421A CN 117643746 A CN117643746 A CN 117643746A
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- 239000013530 defoamer Substances 0.000 title claims abstract description 86
- 238000002360 preparation method Methods 0.000 title claims abstract description 41
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 36
- 239000010703 silicon Substances 0.000 title claims abstract description 36
- -1 polysiloxane Polymers 0.000 claims abstract description 175
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 103
- 239000004743 Polypropylene Substances 0.000 claims abstract description 61
- 229920001155 polypropylene Polymers 0.000 claims abstract description 61
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 230000002902 bimodal effect Effects 0.000 claims abstract description 29
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 25
- 239000013067 intermediate product Substances 0.000 claims abstract description 25
- HMMGMWAXVFQUOA-UHFFFAOYSA-N octamethylcyclotetrasiloxane Chemical compound C[Si]1(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O1 HMMGMWAXVFQUOA-UHFFFAOYSA-N 0.000 claims abstract description 25
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 239000002904 solvent Substances 0.000 claims abstract description 13
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims description 36
- 239000002253 acid Substances 0.000 claims description 32
- 239000000839 emulsion Substances 0.000 claims description 28
- 238000002156 mixing Methods 0.000 claims description 28
- 239000000203 mixture Substances 0.000 claims description 27
- 238000006116 polymerization reaction Methods 0.000 claims description 20
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 18
- 239000000194 fatty acid Substances 0.000 claims description 18
- 229930195729 fatty acid Natural products 0.000 claims description 18
- 239000002562 thickening agent Substances 0.000 claims description 15
- 229920001214 Polysorbate 60 Polymers 0.000 claims description 12
- 230000003301 hydrolyzing effect Effects 0.000 claims description 10
- 239000003054 catalyst Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 7
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 7
- 230000000844 anti-bacterial effect Effects 0.000 claims description 6
- 239000003899 bactericide agent Substances 0.000 claims description 6
- 150000002191 fatty alcohols Chemical class 0.000 claims description 4
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 3
- 150000001412 amines Chemical class 0.000 claims description 3
- 150000002148 esters Chemical class 0.000 claims description 3
- 150000004665 fatty acids Chemical class 0.000 claims description 3
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims description 3
- ISPYQTSUDJAMAB-UHFFFAOYSA-N 2-chlorophenol Chemical compound OC1=CC=CC=C1Cl ISPYQTSUDJAMAB-UHFFFAOYSA-N 0.000 claims description 2
- 230000003115 biocidal effect Effects 0.000 claims 3
- 239000003139 biocide Substances 0.000 claims 3
- 239000002671 adjuvant Substances 0.000 claims 1
- 239000006260 foam Substances 0.000 abstract description 26
- 230000005764 inhibitory process Effects 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 13
- 238000004140 cleaning Methods 0.000 abstract description 5
- 238000004043 dyeing Methods 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 5
- 239000004753 textile Substances 0.000 abstract description 5
- 239000002518 antifoaming agent Substances 0.000 abstract description 3
- 230000002045 lasting effect Effects 0.000 abstract description 2
- 238000006555 catalytic reaction Methods 0.000 abstract 1
- 230000007062 hydrolysis Effects 0.000 abstract 1
- 238000006460 hydrolysis reaction Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 25
- 239000008367 deionised water Substances 0.000 description 20
- 229910021641 deionized water Inorganic materials 0.000 description 20
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 19
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 19
- JBIROUFYLSSYDX-UHFFFAOYSA-M benzododecinium chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)CC1=CC=CC=C1 JBIROUFYLSSYDX-UHFFFAOYSA-M 0.000 description 19
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 19
- 239000000047 product Substances 0.000 description 14
- 238000005187 foaming Methods 0.000 description 12
- 230000008719 thickening Effects 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- 239000012530 fluid Substances 0.000 description 10
- 238000004945 emulsification Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 239000004205 dimethyl polysiloxane Substances 0.000 description 5
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 230000002070 germicidal effect Effects 0.000 description 4
- 239000000178 monomer Substances 0.000 description 4
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 4
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 4
- 241001391944 Commicarpus scandens Species 0.000 description 3
- 239000004721 Polyphenylene oxide Substances 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920000058 polyacrylate Polymers 0.000 description 3
- 229920000570 polyether Polymers 0.000 description 3
- UMPSXRYVXUPCOS-UHFFFAOYSA-N 2,3-dichlorophenol Chemical compound OC1=CC=CC(Cl)=C1Cl UMPSXRYVXUPCOS-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- VGVRPFIJEJYOFN-UHFFFAOYSA-N 2,3,4,6-tetrachlorophenol Chemical class OC1=C(Cl)C=C(Cl)C(Cl)=C1Cl VGVRPFIJEJYOFN-UHFFFAOYSA-N 0.000 description 1
- LHJGJYXLEPZJPM-UHFFFAOYSA-N 2,4,5-trichlorophenol Chemical compound OC1=CC(Cl)=C(Cl)C=C1Cl LHJGJYXLEPZJPM-UHFFFAOYSA-N 0.000 description 1
- WXNZTHHGJRFXKQ-UHFFFAOYSA-N 4-chlorophenol Chemical compound OC1=CC=C(Cl)C=C1 WXNZTHHGJRFXKQ-UHFFFAOYSA-N 0.000 description 1
- RNMDNPCBIKJCQP-UHFFFAOYSA-N 5-nonyl-7-oxabicyclo[4.1.0]hepta-1,3,5-trien-2-ol Chemical compound C(CCCCCCCC)C1=C2C(=C(C=C1)O)O2 RNMDNPCBIKJCQP-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 241001411320 Eriogonum inflatum Species 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- KHSLHYAUZSPBIU-UHFFFAOYSA-M benzododecinium bromide Chemical compound [Br-].CCCCCCCCCCCC[N+](C)(C)CC1=CC=CC=C1 KHSLHYAUZSPBIU-UHFFFAOYSA-M 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- DTPCFIHYWYONMD-UHFFFAOYSA-N decaethylene glycol Polymers OCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO DTPCFIHYWYONMD-UHFFFAOYSA-N 0.000 description 1
- AMTWCFIAVKBGOD-UHFFFAOYSA-N dioxosilane;methoxy-dimethyl-trimethylsilyloxysilane Chemical compound O=[Si]=O.CO[Si](C)(C)O[Si](C)(C)C AMTWCFIAVKBGOD-UHFFFAOYSA-N 0.000 description 1
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 1
- DDXLVDQZPFLQMZ-UHFFFAOYSA-M dodecyl(trimethyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)C DDXLVDQZPFLQMZ-UHFFFAOYSA-M 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 1
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 1
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 1
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 1
- 238000012994 industrial processing Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- XZYHDXZNNDZXSR-UHFFFAOYSA-N n-(1,1-dioxothiolan-3-yl)-n-methyl-2-[(4-phenyl-5-pyridin-4-yl-1,2,4-triazol-3-yl)sulfanyl]acetamide Chemical group N=1N=C(C=2C=CN=CC=2)N(C=2C=CC=CC=2)C=1SCC(=O)N(C)C1CCS(=O)(=O)C1 XZYHDXZNNDZXSR-UHFFFAOYSA-N 0.000 description 1
- 229940090668 parachlorophenol Drugs 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 229940083037 simethicone Drugs 0.000 description 1
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- HCJLVWUMMKIQIM-UHFFFAOYSA-M sodium;2,3,4,5,6-pentachlorophenolate Chemical compound [Na+].[O-]C1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl HCJLVWUMMKIQIM-UHFFFAOYSA-M 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a modified organic silicon defoamer and a preparation method thereof. The preparation raw materials of the modified organic silicon defoamer comprise the following components in parts by weight: 10 to 40 parts of modified polysiloxane, 5 to 10 parts of emulsifying agent, 0.1 to 10 parts of other auxiliary agents and 50 to 80 parts of solvent. The modified polysiloxane is synthesized in two steps, and firstly, the polysiloxane and the unimodal polypropylene are polymerized by hydrolysis of 1-2% hydrochloric acid and concentrated sulfuric acid at 80-100 ℃ to prepare an intermediate product; then the obtained intermediate product is polymerized with bimodal polypropylene and octamethyl cyclotetrasiloxane at 100-120 ℃ under the catalysis of potassium hydroxide to prepare the modified polysiloxane. The defoaming agent has good water solubility, excellent heat resistance, rapid defoaming and lasting foam inhibition, and has excellent foam inhibition effect in the industries of textile printing and dyeing, high-temperature rinsing, industrial cleaning, metal processing and the like.
Description
Technical Field
The invention relates to the technical field of defoamers, in particular to a modified organic silicon defoamer and a preparation method thereof.
Background
In industrial production, processing and handling operations, foam generation is not always avoided, and various sources of foam are available, such as foaming of materials themselves, foaming of additives, foaming of operation modes, etc., and in this time, defoamers are needed to solve the problem of foam. In the industries of textile printing and dyeing, high-temperature rinsing, industrial cleaning, metal processing and the like, foam is more abundant due to the fact that high-temperature heating is accompanied in the production process, and high temperature has higher requirements on compatibility stability and heat resistance of the defoamer.
At present, the defoamer for the systems is mainly an organosilicon defoamer or a polyether modified organosilicon defoamer, the main defoaming component is polydimethylsiloxane (simethicone), the polyether modification is to improve the water solubility of the defoamer, the defoaming effect of the defoamer is very rapid at normal temperature, the action time is long, but the defoaming activity of the defoamer is usually weakened or even fails under the condition of high-temperature heating, the action time is greatly shortened, the addition amount is greatly increased, and the production cost is greatly increased. The high temperature has great destructiveness on the stability of the defoamer emulsion, and the conventional organic silicon defoamer or polyether modified organic silicon defoamer is easy to break emulsion, float oil and precipitate at high temperature, so that the quality and the use value of the finished product are affected.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a modified silicone defoamer which has good water solubility, excellent heat resistance, rapid defoaming and durable foam inhibition, and has excellent foam inhibition effect in textile printing and dyeing, high-temperature rinsing, industrial cleaning, metal processing and other industries.
The second purpose of the invention is to provide a preparation method of the modified organosilicon defoamer, which has the advantages of simple operation, convenient control, high production efficiency and low production cost, and can be used for mass production.
In order to achieve the above purpose, the invention provides a modified organic silicon defoamer, which comprises the following raw materials in parts by weight:
the technical scheme adopted by the invention has at least the following technical effects.
The modified polysiloxane disclosed by the invention introduces the unimodal polypropylene, the unimodal polypropylene is formed by polymerizing a single propylene monomer, the molecular weight distribution is uniform, the compatibility and the matching degree are good, and the water solubility of the organosilicon defoamer can be greatly improved.
The second modified polysiloxane of the invention also introduces the double-peak polypropylene, the double-peak polypropylene is synthesized by copolymerizing two propylene monomers, has wide molecular weight distribution range, higher melting point, stability and high temperature resistance, and can greatly improve the heat resistance of the organosilicon defoamer.
Thirdly, the unimodal polypropylene and the bimodal polypropylene also have certain emulsification effect, and the unimodal polypropylene and the bimodal polypropylene form good compatibility with an emulsifier, have good emulsification effect on an oil-in-water emulsification system, can improve the foam eliminating and inhibiting performance, and improve the stability of products.
Fourth, the modified polysiloxane combines the specific polysiloxane, unimodal polypropylene, bimodal polypropylene and octamethyl cyclotetrasiloxane, has excellent thermal stability and chemical stability, and is favorable for improving the heat resistance of the organosilicon defoamer.
Fifthly, the modified organic silicon defoamer of the invention is added with other auxiliary agents, which is beneficial to further enhancing the stability, improving the fluidity and enhancing the durability, further inhibiting the bacterial growth, enhancing the stability and prolonging the service life, thereby optimizing the performance and improving the defoaming efficiency.
The modified organic silicon defoamer of the invention is added with an emulsifier, has excellent emulsifying, wetting, dispersing and thickening properties, and improves defoaming stability together with other assistants.
As an embodiment of the present invention, the modified polysiloxane has a number average molecular weight of 4000 to 6000 and a viscosity of 600 to 1200 mPas.
As a technical scheme of the invention, the preparation method of each part of modified polysiloxane comprises the following steps:
(A1) 100 parts of polysiloxane, 10-20 parts of unimodal polypropylene, 20 parts of mixed acid, 10-20 parts of bimodal polypropylene, 12-15 parts of octamethyl cyclotetrasiloxane and 1-5 parts of catalyst in parts by weight for standby;
(A2) Mixing the polysiloxane with unimodal polypropylene, adding the mixed acid, and carrying out hydrolytic polymerization for 3-5 h at the temperature of 80-100 ℃ to obtain an intermediate product;
(A3) Mixing the intermediate product, bimodal polypropylene and octamethyl cyclotetrasiloxane, adding the catalyst, and carrying out polymerization reaction for 5-8 h at 100-120 ℃ to obtain the modified polysiloxane.
As a technical scheme of the invention, the mixed acid is 1-2wt% of hydrochloric acid and 98wt% of concentrated sulfuric acid according to the weight ratio of 1-2: 45-55; the catalyst is potassium hydroxide.
As a technical scheme of the invention, the emulsifier is at least one of fatty alcohol polyoxyethylene ether, fatty acid polyoxyethylene ester, fatty amine polyoxyethylene ether, sorbitan fatty acid ester and polyoxyethylene sorbitan fatty acid ester.
As a technical scheme of the invention, each part of other auxiliary agents comprises 0.1-5 parts of thickening agent and 0.1-5 parts of bactericide.
As an embodiment of the present invention, the thickener is a polyacrylic thickener and/or a cellulose thickener.
As a technical scheme of the invention, the bactericide is chlorophenol bactericide and/or quaternary ammonium salt bactericide.
As an aspect of the present invention, the solvent is water.
The invention also provides a preparation method of the modified organic silicon defoamer, which comprises the following steps:
(S1) taking modified polysiloxane, an emulsifier, a solvent and other auxiliary agents according to parts by weight for standby;
(S2) uniformly mixing the modified polysiloxane and the emulsifier to obtain a mixture;
(S3) adding the solvent into the mixture, and stirring to obtain emulsion;
and (S4) adding the other auxiliary agents into the emulsion, and stirring to obtain the defoamer.
In the preparation method of the modified organic silicon defoamer, the active ingredients of the defoamer are obtained after adding and mixing the modified polysiloxane and the emulsifier, then the solvent is slowly dripped for emulsification, and finally other auxiliary agents are added and stirred uniformly, thus obtaining the defoamer finished product.
The invention has the beneficial effects that: the modified organic silicon defoamer has good water solubility, excellent heat resistance, rapid defoaming and lasting foam inhibition, and has excellent foam inhibition effect in the industries of textile printing and dyeing, high-temperature rinsing, industrial cleaning, metal processing and the like.
The preparation method of the modified organosilicon defoamer has the advantages of simple operation, convenient control, high production efficiency and low production cost, and can be used for mass production.
Detailed Description
The invention will be further illustrated by the following examples, which are not intended to limit the scope of the invention, in order to facilitate the understanding of those skilled in the art.
The modified organosilicon defoamer can be applied to defoaming and foam inhibition in textile printing and dyeing, high-temperature rinsing, industrial cleaning and metal processing, and is particularly suitable for defoaming in systems requiring water solubility and heat resistance. The modified organosilicon defoamer can be directly added into a foaming system for defoaming and foam inhibition, or can be added into the foaming system after being prepared into a solution by adding solvents such as water and the like.
The modified organic silicon defoamer comprises the following raw materials in parts by weight:
wherein the weight parts of the modified polysiloxane can be, but are not limited to, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 36 parts, 38 parts
Or 40 parts. The number average molecular weight of the modified polysiloxane is 4000-6000, and the viscosity is 600-1200 mPa.s. As an example, the number average molecular weight of the modified polysiloxane may be, but is not limited to 4000, 4200, 4400, 4600, 4800, 5000, 5200, 5400, 5600, 5800, or 6000, and the viscosity may be, but is not limited to 600 mPa-s, 700 mPa-s, 800 mPa-s, 900 mPa-s, 1000 mPa-s, 1100 mPa-s, or 1200 mPa-s.
The preparation method of each part of modified polysiloxane comprises the following steps:
(A1) 100 parts of polysiloxane, 10-20 parts of unimodal polypropylene, 20 parts of mixed acid, 10-20 parts of bimodal polypropylene, 12-15 parts of octamethyl cyclotetrasiloxane and 1-5 parts of catalyst in parts by weight for standby;
(A2) Mixing the polysiloxane with unimodal polypropylene, adding the mixed acid, and carrying out hydrolytic polymerization for 3-5 h at the temperature of 80-100 ℃ to obtain an intermediate product;
(A3) Mixing the intermediate product, bimodal polypropylene and octamethyl cyclotetrasiloxane, adding the catalyst, and carrying out polymerization reaction for 5-8 h at 100-120 ℃ to obtain the modified polysiloxane.
The mixed acid is 1-2wt% of hydrochloric acid and 98wt% of concentrated sulfuric acid according to the weight ratio of 1-2: 45-55; the catalyst is potassium hydroxide.
The modified polysiloxane is polymerized by polysiloxane and unimodal polypropylene, the unimodal polypropylene is polymerized by single propylene monomer, the molecular weight distribution is uniform, the compatibility and the matching degree are good, the unimodal polypropylene is introduced into the polysiloxane, the original characteristics of high defoaming speed and long foam inhibition time of the polysiloxane are reserved, the water solubility of the defoaming agent is greatly improved, the defect that the defoaming effect and the water solubility of the defoaming agent cannot be both considered is avoided, and the modified polysiloxane is particularly suitable for a foaming system with high water solubility requirements.
The obtained intermediate product is polymerized with bimodal polypropylene and octamethyl cyclotetrasiloxane, the bimodal polypropylene is synthesized by copolymerizing two propylene monomers, the molecular weight distribution range is wide, the melting point, the stability and the high temperature resistance are higher, the bimodal polypropylene is introduced into polysiloxane, the heat resistance of the defoamer can be greatly improved, the defect that the defoamer is unstable at high temperature and easy to break and separate out is avoided, and the method is particularly suitable for solving the foaming in a high-temperature system.
Meanwhile, the unimodal polypropylene and the bimodal polypropylene have better emulsification effect, can form good compatibility with an emulsifier, have better emulsification effect on an oil-in-water emulsification system, can improve the foam eliminating and inhibiting performance, and improve the stability of products.
The weight portion of the emulsifier may be, but is not limited to, 5, 6, 7, 8, 9, or 10. The emulsifier is at least one of fatty alcohol polyoxyethylene ether, fatty acid polyoxyethylene ester, fatty amine polyoxyethylene ether, sorbitan fatty acid ester and polyoxyethylene sorbitan fatty acid ester.
The parts by weight of the other auxiliary agents may be, but are not limited to, 0.1 parts, 0.3 parts, 0.5 parts, 0.8 parts, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts. Further, each part of the other auxiliary agent comprises 0.1-5 parts of a thickening agent and 0.1-5 parts of a bactericide, wherein the thickening agent can be, but is not limited to, a polyacrylic thickening agent and/or a cellulose thickening agent, the polyacrylic thickening agent can be, but is not limited to, sodium polyacrylate or polyacrylate copolymer, and the cellulose thickening agent can be, but is not limited to, hydroxyethyl cellulose, hydroxypropyl methyl cellulose or carboxymethyl cellulose. By way of example, the thickener may be, but is not limited to, 0.1 part, 0.3 part, 0.5 part, 0.8 part, 1 part, 2 parts, 3 parts, 4 parts, or 5 parts. The germicides may be, but are not limited to, chlorophenols germicides, which may be, but are not limited to, at least one of dichlorophenol, sodium pentachlorophenate, and 2,4, 5-trichlorophenol, and/or quaternary ammonium salts germicides, which may be, but are not limited to, at least one of dodecyltrimethylammonium chloride, dodecyldimethylbenzyl ammonium chloride, and dodecyldimethylbenzyl ammonium bromide. By way of example, the germicide may be, but is not limited to, 0.1, 0.3, 0.5, 0.8, 1, 2, 3, 4, or 5 parts.
The parts by weight of the solvent may be, but are not limited to, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, or 80 parts. The solvent may be, but is not limited to, water.
The preparation method of the modified organosilicon defoamer comprises the following steps:
(S1) taking modified polysiloxane, an emulsifier, a solvent and other auxiliary agents according to parts by weight for standby;
(S2) uniformly mixing the modified polysiloxane and the emulsifier to obtain a mixture;
(S3) adding the solvent into the mixture, and stirring to obtain emulsion;
and (S4) adding the other auxiliary agents into the emulsion, and stirring to obtain the defoamer.
For a better description of the objects, technical solutions and advantageous effects of the present invention, the present invention will be further described with reference to specific examples. It should be noted that the following implementation of the method is a further explanation of the present invention and should not be taken as limiting the present invention.
Example 1
The embodiment is a modified organic silicon defoamer, and the preparation raw materials comprise the following components in parts by weight: 15 parts of modified polysiloxane, 6 parts of polyoxyethylene sorbitan fatty acid ester T-80, 2 parts of hydroxyethyl cellulose, 1 part of dodecyl dimethyl benzyl ammonium chloride and 76 parts of deionized water.
The preparation method of each part of modified polysiloxane comprises the following steps:
(A1) 100 parts of polysiloxane, 12 parts of unimodal polypropylene, 20 parts of mixed acid, 12 parts of bimodal polypropylene, 12 parts of octamethyl cyclotetrasiloxane and 2 parts of potassium hydroxide are taken according to parts by weight for standby;
(A2) Mixing the polysiloxane with unimodal polypropylene, adding the mixed acid, and carrying out hydrolytic polymerization at 85 ℃ for 3.5 hours to obtain an intermediate product;
(A3) Mixing the intermediate product, bimodal polypropylene and octamethyl cyclotetrasiloxane, adding potassium hydroxide, and carrying out polymerization reaction for 5.5 hours at 105 ℃ to obtain the modified polysiloxane.
The mixed acid is 1.5 weight percent hydrochloric acid and 98 weight percent concentrated sulfuric acid, and the weight ratio is 1: 50.
The preparation method of the modified organic silicon defoamer of the embodiment comprises the following steps: adding the modified polysiloxane and the emulsifier into a reaction kettle, and uniformly stirring to obtain a mixture; slowly dripping deionized water into the mixture, and uniformly stirring to obtain emulsion; adding hydroxyethyl cellulose into the emulsion, and thickening to obtain a fluid liquid; adding dodecyl dimethyl benzyl ammonium chloride into the flowing liquid, and stirring uniformly to obtain the finished product of the defoamer.
Example 2
The embodiment is a modified organic silicon defoamer, and the preparation raw materials comprise the following components in parts by weight: 20 parts of modified polysiloxane, 7 parts of polyoxyethylene sorbitan fatty acid ester T-80, 1.5 parts of hydroxyethyl cellulose, 0.5 part of dodecyl dimethyl benzyl ammonium chloride and 71 parts of deionized water.
The preparation method of each part of modified polysiloxane comprises the following steps:
(A1) 100 parts of polysiloxane, 15 parts of unimodal polypropylene, 20 parts of mixed acid, 15 parts of bimodal polypropylene, 13 parts of octamethyl cyclotetrasiloxane and 3 parts of potassium hydroxide are taken according to parts by weight for standby;
(A2) Mixing the polysiloxane with unimodal polypropylene, adding the mixed acid, and carrying out hydrolytic polymerization for 4 hours at 90 ℃ to obtain an intermediate product;
(A3) Mixing the intermediate product, bimodal polypropylene and octamethyl cyclotetrasiloxane, adding potassium hydroxide, and carrying out polymerization reaction for 6h at 110 ℃ to obtain the modified polysiloxane.
The mixed acid is 1.5 weight percent hydrochloric acid and 98 weight percent concentrated sulfuric acid, and the weight ratio is 1: 50.
The preparation method of the modified organic silicon defoamer of the embodiment comprises the following steps: adding the modified polysiloxane and the emulsifier into a reaction kettle, and uniformly stirring to obtain a mixture; slowly dripping deionized water into the mixture, and uniformly stirring to obtain emulsion; adding hydroxyethyl cellulose into the emulsion, and thickening to obtain a fluid liquid; adding dodecyl dimethyl benzyl ammonium chloride into the flowing liquid, and stirring uniformly to obtain the finished product of the defoamer.
Example 3
The embodiment is a modified organic silicon defoamer, and the preparation raw materials comprise the following components in parts by weight: 25 parts of modified polysiloxane, 8 parts of polyoxyethylene sorbitan fatty acid ester T-80, 1.5 parts of hydroxyethyl cellulose, 0.5 part of dodecyl dimethyl benzyl ammonium chloride and 65 parts of deionized water.
The preparation method of each part of modified polysiloxane comprises the following steps:
(A1) 100 parts of polysiloxane, 12 parts of unimodal polypropylene, 20 parts of mixed acid, 12 parts of bimodal polypropylene, 12 parts of octamethyl cyclotetrasiloxane and 2 parts of potassium hydroxide are taken according to parts by weight for standby;
(A2) Mixing the polysiloxane with unimodal polypropylene, adding the mixed acid, and carrying out hydrolytic polymerization at 85 ℃ for 3.5 hours to obtain an intermediate product;
(A3) Mixing the intermediate product, bimodal polypropylene and octamethyl cyclotetrasiloxane, adding potassium hydroxide, and carrying out polymerization reaction for 5.5 hours at 105 ℃ to obtain the modified polysiloxane.
The mixed acid is 1.5 weight percent hydrochloric acid and 98 weight percent concentrated sulfuric acid, and the weight ratio is 1: 50.
The preparation method of the modified organic silicon defoamer of the embodiment comprises the following steps: adding the modified polysiloxane and the emulsifier into a reaction kettle, and uniformly stirring to obtain a mixture; slowly dripping deionized water into the mixture, and uniformly stirring to obtain emulsion; adding hydroxyethyl cellulose into the emulsion, and thickening to obtain a fluid liquid; adding dodecyl dimethyl benzyl ammonium chloride into the flowing liquid, and stirring uniformly to obtain the finished product of the defoamer.
Example 4
The embodiment is a modified organic silicon defoamer, and the preparation raw materials comprise the following components in parts by weight: 30 parts of modified polysiloxane, 9 parts of fatty alcohol polyoxyethylene ether AEO-7, 1.5 parts of hydroxyethyl cellulose, 0.5 part of dodecyl dimethyl benzyl ammonium chloride and 59 parts of deionized water.
The preparation method of each part of modified polysiloxane comprises the following steps:
(A1) 100 parts of polysiloxane, 12 parts of unimodal polypropylene, 20 parts of mixed acid, 12 parts of bimodal polypropylene, 12 parts of octamethyl cyclotetrasiloxane and 2 parts of potassium hydroxide are taken according to parts by weight for standby;
(A2) Mixing the polysiloxane with unimodal polypropylene, adding the mixed acid, and carrying out hydrolytic polymerization at 85 ℃ for 3.5 hours to obtain an intermediate product;
(A3) Mixing the intermediate product, bimodal polypropylene and octamethyl cyclotetrasiloxane, adding potassium hydroxide, and carrying out polymerization reaction for 5.5 hours at 105 ℃ to obtain the modified polysiloxane.
The mixed acid is 1.5 weight percent hydrochloric acid and 98 weight percent concentrated sulfuric acid, and the weight ratio is 1: 50.
The preparation method of the modified organic silicon defoamer of the embodiment comprises the following steps: adding the modified polysiloxane and the emulsifier into a reaction kettle, and uniformly stirring to obtain a mixture; slowly dripping deionized water into the mixture, and uniformly stirring to obtain emulsion; adding hydroxyethyl cellulose into the emulsion, and thickening to obtain a fluid liquid; adding dodecyl dimethyl benzyl ammonium chloride into the flowing liquid, and stirring uniformly to obtain the finished product of the defoamer.
Example 5
The embodiment is a modified organic silicon defoamer, and the preparation raw materials comprise the following components in parts by weight: 15 parts of modified polysiloxane, 6 parts of polyoxyethylene sorbitan fatty acid ester T-80, 2 parts of hydroxyethyl cellulose, 1 part of dichlorophenol and 76 parts of deionized water.
The preparation method of each part of modified polysiloxane comprises the following steps:
(A1) 100 parts of polysiloxane, 12 parts of unimodal polypropylene, 20 parts of mixed acid, 12 parts of bimodal polypropylene, 12 parts of octamethyl cyclotetrasiloxane and 2 parts of potassium hydroxide are taken according to parts by weight for standby;
(A2) Mixing the polysiloxane with unimodal polypropylene, adding the mixed acid, and carrying out hydrolytic polymerization at 85 ℃ for 3.5 hours to obtain an intermediate product;
(A3) Mixing the intermediate product, bimodal polypropylene and octamethyl cyclotetrasiloxane, adding potassium hydroxide, and carrying out polymerization reaction for 5.5 hours at 105 ℃ to obtain the modified polysiloxane.
The mixed acid is 1.5 weight percent hydrochloric acid and 98 weight percent concentrated sulfuric acid, and the weight ratio is 1: 50.
The preparation method of the modified organic silicon defoamer of the embodiment comprises the following steps: adding the modified polysiloxane and the emulsifier into a reaction kettle, and uniformly stirring to obtain a mixture; slowly dripping deionized water into the mixture, and uniformly stirring to obtain emulsion; adding hydroxyethyl cellulose into the emulsion, and thickening to obtain a fluid liquid; adding the parachlorophenol into the flowing liquid, and uniformly stirring to obtain the finished product of the defoamer.
Example 6
The embodiment is a modified organic silicon defoamer, and the preparation raw materials comprise the following components in parts by weight: 15 parts of modified polysiloxane, 6 parts of polyoxyethylene sorbitan fatty acid ester T-80, 2 parts of polyacrylate copolymer, 1 part of dodecyl dimethyl benzyl ammonium chloride and 76 parts of deionized water.
The preparation method of each part of modified polysiloxane comprises the following steps:
(A1) 100 parts of polysiloxane, 12 parts of unimodal polypropylene, 20 parts of mixed acid, 12 parts of bimodal polypropylene, 12 parts of octamethyl cyclotetrasiloxane and 2 parts of potassium hydroxide are taken according to parts by weight for standby;
(A2) Mixing the polysiloxane with unimodal polypropylene, adding the mixed acid, and carrying out hydrolytic polymerization at 85 ℃ for 3.5 hours to obtain an intermediate product;
(A3) Mixing the intermediate product, bimodal polypropylene and octamethyl cyclotetrasiloxane, adding potassium hydroxide, and carrying out polymerization reaction for 5.5 hours at 105 ℃ to obtain the modified polysiloxane.
The mixed acid is 1.5 weight percent hydrochloric acid and 98 weight percent concentrated sulfuric acid, and the weight ratio is 1: 50.
The preparation method of the modified organic silicon defoamer of the embodiment comprises the following steps: adding the modified polysiloxane and the emulsifier into a reaction kettle, and uniformly stirring to obtain a mixture; slowly dripping deionized water into the mixture, and uniformly stirring to obtain emulsion; adding polyacrylate copolymer into the emulsion, and thickening to obtain a fluid; adding dodecyl dimethyl benzyl ammonium chloride into the flowing liquid, and stirring uniformly to obtain the finished product of the defoamer.
Comparative example 1
The embodiment is a modified organic silicon defoamer, and the preparation raw materials comprise the following components in parts by weight: 15 parts of polydimethylsiloxane (number average molecular weight 6000, viscosity 100 mPa.s), 6 parts of polyoxyethylene sorbitan fatty acid ester T-80, 2 parts of hydroxyethyl cellulose, 1 part of dodecyl dimethyl benzyl ammonium chloride and 76 parts of deionized water.
The preparation method of the modified organic silicon defoamer of the embodiment comprises the following steps: adding polydimethylsiloxane and an emulsifier into a reaction kettle, and uniformly stirring to obtain a mixture; slowly dripping deionized water into the mixture, and uniformly stirring to obtain emulsion; adding hydroxyethyl cellulose into the emulsion, and thickening to obtain a fluid liquid; adding dodecyl dimethyl benzyl ammonium chloride into the flowing liquid, and stirring uniformly to obtain the finished product of the defoamer.
Comparative example 2
The embodiment is a modified organic silicon defoamer, and the preparation raw materials comprise the following components in parts by weight: 20 parts of polydimethylsiloxane (number average molecular weight: 5000, viscosity: 900 mPa.s), 7 parts of polyoxyethylene sorbitan fatty acid ester T-80, 1.5 parts of hydroxyethylcellulose, 0.5 part of dodecyldimethylbenzyl ammonium chloride and 71 parts of deionized water.
The preparation method of the modified organic silicon defoamer of the embodiment comprises the following steps: adding polydimethylsiloxane and an emulsifier into a reaction kettle, and uniformly stirring to obtain a mixture; slowly dripping deionized water into the mixture, and uniformly stirring to obtain emulsion; adding hydroxyethyl cellulose into the emulsion, and thickening to obtain a fluid liquid; adding dodecyl dimethyl benzyl ammonium chloride into the flowing liquid, and stirring uniformly to obtain the finished product of the defoamer.
Comparative example 3
The embodiment is a modified organic silicon defoamer, and the preparation raw materials comprise the following components in parts by weight: 15 parts of modified polysiloxane, 6 parts of polyoxyethylene sorbitan fatty acid ester T-80, 2 parts of hydroxyethyl cellulose, 1 part of dodecyl dimethyl benzyl ammonium chloride and 76 parts of deionized water.
The preparation method of each part of modified polysiloxane comprises the following steps:
(A1) 100 parts of polysiloxane, 24 parts of unimodal polypropylene, 20 parts of mixed acid, 12 parts of octamethyl cyclotetrasiloxane and 2 parts of potassium hydroxide are taken according to parts by weight for standby;
(A2) Mixing the polysiloxane with unimodal polypropylene, adding the mixed acid, and carrying out hydrolytic polymerization at 85 ℃ for 3.5 hours to obtain an intermediate product;
(A3) Mixing the intermediate product with octamethyl cyclotetrasiloxane, adding potassium hydroxide, and mixing for 5.5 hours at 105 ℃ to obtain the modified polysiloxane.
The mixed acid is 1.5 weight percent hydrochloric acid and 98 weight percent concentrated sulfuric acid, and the weight ratio is 1: 50.
The preparation method of the modified organic silicon defoamer of the embodiment comprises the following steps: adding the modified polysiloxane and the emulsifier into a reaction kettle, and uniformly stirring to obtain a mixture; slowly dripping deionized water into the mixture, and uniformly stirring to obtain emulsion; adding hydroxyethyl cellulose into the emulsion, and thickening to obtain a fluid liquid; adding dodecyl dimethyl benzyl ammonium chloride into the flowing liquid, and stirring uniformly to obtain the finished product of the defoamer.
Comparative example 4
The embodiment is a modified organic silicon defoamer, and the preparation raw materials comprise the following components in parts by weight: 15 parts of modified polysiloxane, 6 parts of polyoxyethylene sorbitan fatty acid ester T-80, 2 parts of hydroxyethyl cellulose, 1 part of dodecyl dimethyl benzyl ammonium chloride and 76 parts of deionized water.
The preparation method of each part of modified polysiloxane comprises the following steps:
(A1) 100 parts of polysiloxane, 20 parts of mixed acid, 24 parts of bimodal polypropylene, 12 parts of octamethyl cyclotetrasiloxane and 2 parts of potassium hydroxide are taken according to parts by weight for standby;
(A2) Adding the polysiloxane into the mixed acid, and mixing for 3.5 hours at the temperature of 85 ℃ to obtain an intermediate product;
(A3) Mixing the intermediate product, bimodal polypropylene and octamethyl cyclotetrasiloxane, adding potassium hydroxide, and carrying out polymerization reaction for 5.5 hours at 105 ℃ to obtain the modified polysiloxane.
The mixed acid is 1.5 weight percent hydrochloric acid and 98 weight percent concentrated sulfuric acid, and the weight ratio is 1: 50.
The preparation method of the modified organic silicon defoamer of the embodiment comprises the following steps: adding the modified polysiloxane and the emulsifier into a reaction kettle, and uniformly stirring to obtain a mixture; slowly dripping deionized water into the mixture, and uniformly stirring to obtain emulsion; adding hydroxyethyl cellulose into the emulsion, and thickening to obtain a fluid liquid; adding dodecyl dimethyl benzyl ammonium chloride into the flowing liquid, and stirring uniformly to obtain the finished product of the defoamer.
Performance test:
the modified silicone defoamers of examples 1 to 6 and comparative examples 1 to 4 were tested for compatibility, defoaming performance and foam inhibition performance at different temperatures under the following test conditions, and the test results are shown in table 1. The test sample is a standard foaming liquid prepared by mixing 0.5% of polyoxyethylene (10) nonylphenol ether and 0.5% of sodium dodecyl benzene sulfonate, and the system temperature is respectively 25 ℃ (normal temperature), 50 ℃ (medium temperature) and 80 ℃ (high temperature) by using a constant-temperature water area pot.
(1) Compatibility test
In a 250mL beaker, 100g of foaming liquid is weighed, 1g of modified organosilicon defoamer of examples 1-6 and comparative examples 1-4 is respectively added, the temperature of the system is regulated by a constant-temperature water area pot, magnetic stirring is carried out for 10min, and after standing for 1h, the oil bleaching conditions are respectively compared.
(2) Defoaming property
50g of foaming liquid is weighed by a 100mL measuring cylinder, 0.05g of modified organosilicon defoamer of examples 1-6 and comparative examples 1-4 are respectively added, the temperature is respectively kept to 25 ℃, 50 ℃ and 80 ℃ in a water bath, the bottle stopper is covered, the measuring cylinder is vertically shaken up and down for 10 times with the frequency of 2 times/s and the swing amplitude of (30-35) cm, the mixture is kept stand and the time for eliminating foam until the liquid level appears is recorded by a stopwatch.
(3) Foam inhibition performance
A foam property tester of lubricating oil (defoamer) meeting the measurement requirement of GB/T12579 is adopted. The foam characteristic tester is started and regulated, the constant-temperature water bath temperature of the tester is set to 25 ℃, 50 ℃ and 80 ℃ respectively, and the test air flow is 100mL/min. 100g of foaming liquid is weighed, 0.1g of modified organic silicon defoamer of examples 1-6 and comparative examples 1-4 is respectively weighed, added into the foaming liquid, stirred uniformly, and poured into a clean bubbling instrument measuring cylinder to be respectively and constantly heated to 25 ℃, 50 ℃ and 80 ℃. The flow pump was turned on and the test was started, the foam volume (mL) of the air drum was recorded for 30min, and the results were expressed as the corresponding foam volume at 30min of air drum.
TABLE 1 compatibility and foam inhibition Properties of modified Silicone defoamers of examples 1-6 and comparative examples 1-4 at different temperatures
From the results in Table 1, it is clear that the compatibility and foam suppressing performance of the modified silicone defoamers of examples 1 to 6 are better than those of comparative examples 1 to 4, and are more remarkable particularly under high temperature conditions. The modified polysiloxane selected in examples 1-6 is stable in structure and does not decompose in a high-temperature system, is a good high-temperature-resistant defoaming active substance, can keep the original defoaming speed in the high-temperature system, and is long in foam inhibition time and good in compatibility. The method mainly introduces the unimodal polypropylene into the polysiloxane, so that the original characteristics of high defoaming speed and long foam inhibition time of the polysiloxane are maintained, the water solubility of the defoamer is greatly improved, and the defect that both the defoaming effect and the water solubility of the defoamer cannot be considered is avoided; the bimodal polypropylene is introduced into polysiloxane, so that the heat resistance of the defoamer can be greatly improved, and the defect that the defoamer is unstable at high temperature and easy to break and separate out is overcome.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or substituted without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. The modified organic silicon defoamer is characterized by comprising the following raw materials in parts by weight:
2. the modified silicone defoamer of claim 1, wherein the modified polysiloxane has a number average molecular weight of 4000 to 6000 and a viscosity of 600 to 1200 mPa-s.
3. The modified silicone defoamer of claim 1, wherein the preparation method of each part of the modified polysiloxane comprises the following steps:
(A1) 100 parts of polysiloxane, 10-20 parts of unimodal polypropylene, 20 parts of mixed acid, 10-20 parts of bimodal polypropylene, 12-15 parts of octamethyl cyclotetrasiloxane and 1-5 parts of catalyst in parts by weight for standby;
(A2) Mixing the polysiloxane with unimodal polypropylene, adding the mixed acid, and carrying out hydrolytic polymerization for 3-5 h at the temperature of 80-100 ℃ to obtain an intermediate product;
(A3) Mixing the intermediate product, bimodal polypropylene and octamethyl cyclotetrasiloxane, adding the catalyst, and carrying out polymerization reaction for 5-8 h at 100-120 ℃ to obtain the modified polysiloxane.
4. The modified silicone defoamer of claim 3, wherein the mixed acid is 1-2 wt% hydrochloric acid and 98wt% concentrated sulfuric acid in a weight ratio of 1-2: 45-55; the catalyst is potassium hydroxide.
5. The modified silicone defoamer of claim 1, wherein the emulsifier is at least one of a fatty alcohol polyoxyethylene ether, a fatty acid polyoxyethylene ester, a fatty amine polyoxyethylene ether, a sorbitan fatty acid ester, and a polyoxyethylene sorbitan fatty acid ester.
6. The modified silicone defoamer of claim 1, wherein each of said other adjuvants comprises 0.1 to 5 parts of thickener and 0.1 to 5 parts of bactericide.
7. The modified silicone defoamer of claim 6, wherein said thickener is a polyacrylic thickener and/or a cellulosic thickener.
8. The modified silicone defoamer of claim 6, wherein the biocide is a chlorophenol biocide and/or a quaternary ammonium salt biocide.
9. The modified silicone defoamer of claim 1, wherein the solvent is water.
10. The method for producing a modified silicone defoamer according to any one of claims 1 to 9, characterized by comprising the steps of:
(S1) taking modified polysiloxane, an emulsifier, a solvent and other auxiliary agents according to parts by weight for standby;
(S2) uniformly mixing the modified polysiloxane and the emulsifier to obtain a mixture;
(S3) adding the solvent into the mixture, and stirring to obtain emulsion;
and (S4) adding the other auxiliary agents into the emulsion, and stirring to obtain the defoamer.
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| US20230013717A1 (en) * | 2019-12-17 | 2023-01-19 | Kingfa Sci. & Tech. Co., Ltd. | Polypropylene composition, preparation method and use thereof |
| CN116272000A (en) * | 2023-03-30 | 2023-06-23 | 广东南辉新材料有限公司 | Acid-resistant defoamer and preparation method thereof |
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| GB1016512A (en) * | 1961-07-28 | 1966-01-12 | Kogyogijutsuin | Preparation of a new type polymer silicopolypropylene |
| EP0565093A1 (en) * | 1992-04-08 | 1993-10-13 | Dow Corning Toray Silicone Company, Limited | A method of producing diorganopolysiloxane/acrylic acid ester graft copolymer emulsion |
| US20230013717A1 (en) * | 2019-12-17 | 2023-01-19 | Kingfa Sci. & Tech. Co., Ltd. | Polypropylene composition, preparation method and use thereof |
| CN111151033A (en) * | 2020-01-17 | 2020-05-15 | 广东轻工职业技术学院 | Preparation method of novel polyether modified organic silicon defoaming agent |
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