CN101632908A - Method for preparing defoaming agent composition - Google Patents

Method for preparing defoaming agent composition Download PDF

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CN101632908A
CN101632908A CN200910184385A CN200910184385A CN101632908A CN 101632908 A CN101632908 A CN 101632908A CN 200910184385 A CN200910184385 A CN 200910184385A CN 200910184385 A CN200910184385 A CN 200910184385A CN 101632908 A CN101632908 A CN 101632908A
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polysiloxane
defoaming agent
agent composition
polyether
filler particles
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CN101632908B (en
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吴飞
曹治平
黄伟
曹添
钟翔
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JIANGSU SIXIN SCIENTIFIC-TECHNOLOGICAL APPLICATION RESEARCH INSTITUTE CO., LTD.
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Sixin Science & Technology Applied Inst Co Ltd Nanjing City
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Abstract

The invention discloses a method for preparing a defoaming agent composition, belonging to the technical field of fine chemical preparation. The invention provides a defoaming agent composition widely used for removing harmful foams in industrial production. The defoaming agent composition comprises the following components: (1) polysiloxane RaSiO(4-a)/2; (2) a coupling agent; (3) fine filler particles such as silicon dioxide and the like; (4) organic silicon resin; (5) polyether modified polysiloxane MDx(CH3GSiO)yM, wherein M is chain link R'2SiO1/2, D is chain link R'2SiO2/2, G is polyether radical-(CH2)z(EO)g(PO)hR'' and (6) an alkaline catalyst. The preparation method comprises the following steps: (1) heating the polysiloxane and the coupling agent together in a stirring machine, adding the alkaline catalyst to carry out a polymerization reaction at the temperature of 40-140 DEG C; (2) after crosslinking the mixture, adding the organic silicon resin and the polyether modified polysiloxane, carrying out a reaction again for 1-7 h at the temperature of 80-140 DEG C, and then adding the fine filler particles to mix uniformly, carrying out a reaction for 1-6 h at temperature of 90-180 DEG C; (3) after finishing the reaction, keeping the mixture for 0.1-1.5 h at the vacuum degree of -0.01 to -0.08 MPa, and finally, cooling to the room temperature to obtain white active materials that are defoaming agent compositions.

Description

A kind of preparation of defoaming agent composition
Technical field
The present invention relates to a kind ofly based on polysiloxane, and introduce the preparation of the universal defoaming agent composition of polyether-modified polysiloxanes therein, said composition has excellent antifoaming performance in anion, nonionic foaming system.Defoaming agent composition belongs to fine chemicals, therefore, the invention belongs to technical field of fine chemical preparations.
Technical background
Foam is a common phenomena in the live and work.But foam can bring great harm sometimes in industrial production, for example reduce machine operating efficiency, incur loss through delay working time, influence the quality of product etc.The method of eliminating harmful foam mainly contains physical method and chemical method, and the defoamer froth breaking is one of chemical method.Along with the significantly raising of industrial enterprise's production scale and production efficiency, the defoamer froth breaking is more widely used.At present, defoamer has been widely used in the industries such as papermaking, textile printing and dyeing, oil exploitation and refining, coating, emulsion polymerisation, sewage disposal, metal cleaning, and defoamer has become indispensable functional aid in the production process.
According to the difference of froth breaking active matter, defoamer is divided into mineral oil origin, polyether-type and several main types such as silicone based.Compare with other defoamers, poly organo siloxane defoamer stable chemical performance, side effect is little, and good froth breaking ability and the lasting bubble ability that presses down are also arranged under the very low situation of consumption simultaneously, thereby, favored very much.
The froth breaking active matter is the core of defoamer, and its antifoaming speed and suds suppressing properties directly influence the performance of final products.For silicone based defoamer, the improvement of the antifoaming performance of its active matter is the improvement direction of silicone defoaming agent.The most original polysiloxane defoamers active matter is handled through specific process technology by dimethyl silicone polymer and silica and is obtained, and the defoaming agent composition of introducing as US3383327 comes to this.But because it can not press down bubble lastingly, promptly suds suppressing properties is poor, and therefore, domestic and international research personnel have carried out large-scale expansion research to its performance.US4338217A1 replaces common polysiloxanes and silicon dioxide granule mixed processing to make the froth breaking active matter with the alkoxyl polysiloxanes; US5824739 introducing amino silicones or carboxyl polysiloxanes obtain defoaming composition as the main body of froth breaking active matter with the silica mixed processing; EP163541B1 introduces with the polysiloxanes that contains terminal hydroxyl and form the side chain polysiloxane with the polysiloxane reaction that contains other active function groups under the effect of catalyst, and replace common polysiloxanes and hydrophilic silicon dioxide mixed processing with this, prepared defoamer formulations has very high viscosity, is difficult to this emulsification is dispersed in the water.US5153258 introduces and introduce the antifoaming performance that lightly crosslinked polysiloxane can improve composition in system, for example contain vinyl polysiloxane and hydrogeneous polysiloxane, hydroxyl polysiloxane and alkyl silicate and under the effect of catalyst, cross-linking reaction takes place, but crosslinking degree is difficult to control.CN1931417A discloses a kind of defoaming agent composition of high temperature resistant anti-highly basic, it is obtained by polysiloxanes and organic siliconresin cross-linking reaction, active matter is prepared into after the emulsion bubbling test performance in black liquor, it has suds suppressing properties preferably, but antifoaming speed remains further to be improved, and, because froth breaking active matter viscosity is bigger, be dispersed in the water it quite difficult.
The silicone antifoam agent of EP-A341952 introduction use branching and the composition of polyethers one polysiloxane copolymer are used for pulp production as defoamer.US5523019 introduces the composition of mineral oil and polyether-polysiloxane copolymers as defoamer, it is said to have positive effect.According to WO 98/000216, the siloxanes that contains dimethyl-3-hydroxypropyl-polyoxyethylene polyoxypropylene group is a specially suitable surfactant in the defoamer formulation.
In sum, the improvement of present existing froth breaking active matter mainly comprises the following aspects: (1) replaces methyl polysiloxane with modified polyorganosiloxane (for example hydroxyl polysiloxanes, contain amino silicones); (2) the cancellated polysiloxanes in space replaces the straight chain polysiloxane; (3) in the system of polysiloxanes and silicon dioxide granule, introduce organic siliconresin etc.; (4) as wherein adding polyethers or polyether-modified polysiloxanes.
The present invention reacts under the effect of catalyst by dimethyl silicone polymer, coupling agent, silicon polyethers, the silicones of trimethylsiloxy group end-blocking, with silica-treated, the froth breaking active matter that obtains has good antifoaming speed and suds suppressing properties in anion, nonionic foaming system then.The formation principle of froth breaking active matter still imperfectly understands at present, analyze its mechanism and may be and wherein contain the affinity that has increased froth breaking active matter and water behind the silicon polyethers, the froth breaking active matter can be dispersed into the defoamer particulate of required size with fast speeds in water, therefore, has antifoaming speed faster.
Summary of the invention
A kind of preparation of defoaming agent composition provides a kind of defoaming composition based on polysiloxanes, it is low to have viscosity, easily disperse, in various systems, have very fast antifoaming speed and good characteristics such as suds suppressing properties, can be widely used in harmful foam of eliminating in the industrial production.
Technical scheme
A kind of defoaming agent composition is characterized in that it is made up of following material:
A, polysiloxane.The general structure of polysiloxane is as follows:
R aSiO (4-a)/2
Wherein the value of a is 1.9~2.2, R in the molecular structure is identical or different, and the carbon number that it comprises the replacement of hydrogen atom, monovalence or non-replacement is 1~20 alkyl, and R is an alkyl, specifically comprise: alkyl, as methyl, ethyl, propyl group, n-pro-pyl, butyl, isobutyl group; Aryl is as phenyl, benzyl; Thiazolinyl is as vinyl, acrylic, pi-allyl, cyclohexenyl group.Consider that from the angle that raw material are easy to get preferred radicals R more than 80% is a methyl.The dynamic viscosity of this polysiloxane in the time of 25 ℃ is 1,000~300,000mPas, and the polysiloxane that the present invention adopts is the dimethyl silicone polymer of trimethylsiloxy group end-blocking.
B, coupling agent.The coupling agent that adds 0.5~20 part in per 100 parts polysiloxane, preferred 1~10 part.Coupling agent from following selection one or more, comprise MTMS, MTES, phenyl triethoxysilane, methyl triacetic acid base silane, tetraethoxysilane, ethyl orthosilicate, dimethyl diethoxy siloxanes, ethyl triethoxysilane.
C, meticulous filler particles.Meticulous filler particles is meant the oxide of silicon, magnesium, zinc, aluminium, i.e. silica, magnesia, zinc oxide, alundum (Al.These meticulous filler particles use separately or mix and use.Silica is commonly called as white carbon, and it is divided into two kinds of precipitated silica and fume colloidal silicas by manufacture method, is divided into two kinds of hydrophilic white carbon and hydrophobic silicic aerogels by surface nature.The meticulous filler particles that adds 0.1~20 part in per 100 parts polysiloxane, preferred 4~10 parts.The preferred meticulous filler particles of the present invention is a fume colloidal silica, can be the hydrophilic white carbon of vapor phase method, also can be the vapor phase method hydrophobic silicic aerogels, and its specific area is 20~800m 2/ g, preferred 50~500m 2/ g.
D, organic siliconresin.Organic siliconresin refers to the cancellated polysiloxane in highly cross-linked space, this cancellated polysiloxane is normally by various mixtures hydrolysis in organic solvent such as toluene of methyl trichlorosilane, dimethyldichlorosilane, phenyl trichlorosilane, diphenyl dichlorosilane or dichloromethyl phenylsilane, obtain the acidic hydrolysis thing, remove disacidify through washing then, obtain product.The organic siliconresin that the present invention uses is by chain link R ' 3SiO 1/2(being called the M unit in the organosilicon chemistry) and chain link SiO 4/2The MQ resin that the unit of (Q unit) is formed, the mol ratio between the two is (0.4~1.2): 1.0, preferred (0.5~0.8): 1.0.In described M unit R ' 3SiO 1/2, R ' wherein is identical or different, and R is consistent in the general structure of value and polysiloxane, is 1~20 alkyl for the carbon number of the replacement of hydrogen atom, monovalence or non-replacement.
The described organic siliconresin that in 100 parts polysiloxane, adds 1~20 part, preferred 4~15 parts.
E, polyether-modified polysiloxanes.Take place under the effect of catalyst by hydrogen containing siloxane and the polyethers that contains unsaturated bond that addition reaction prepares.The described polyether-modified polysiloxanes preferably average viscosity under 25 ℃ is 10~30, and 000mPas is preferably at 25 ℃ and descends 60~5,000mPas.The structural formula of polyether-modified polysiloxanes is as follows:
MD x(CH 3GSiO) yM
Wherein, M is identical with M unit in the organic siliconresin, is chain link R ' 3SiO 1/2, D is chain link R ' 2SiO 2/2, the R ' span of two structural formulas is identical; G is a polyether group, represents with following general structure :-(CH 2) z(EO) g(PO) hR ", R in the formula " be-H or-CH 3Or-COCH 3Above-mentioned each structural formula subscript x, y, z, g, h are the degree of polymerization, x is 10~500 integer; Y is 1~50 integer; Z is 2~6 integer; G is 1~36 integer; H is 0~20 integer.
In 100 parts polysiloxane, add 0.1~50 part of described polyether-modified polysiloxanes, preferred 1~20 part.
F, base catalyst.Base catalyst is used for accelerating reacting between coupling agent and the polysiloxane.The hydroxide that comprises alkali metal hydroxide, alkali metal silane alkoxide, alkali metal alkyl oxide, quaternary ammonium salt, specifically refer to NaOH, potassium hydroxide, cesium hydroxide, methyl silanol potassium, methyl silicon sodium alcoholate, sodium methoxide, caustic alcohol, potassium methoxide, potassium ethoxide, beta-hydroxyethyl Trimethylamine, TMAH etc., preferable methyl silanol potassium.Add 0.1~10 part of base catalyst in per 100 parts polysiloxane, preferred 0.5~5 part.
The preparation method of defoaming agent composition of the present invention is as follows:
Polysiloxane and coupling agent heat up in stirrer for mixing, add the base catalyst polymerization reaction take place in the time of 40~140 ℃; Crosslinked back takes place and adds organic siliconresin and polyether-modified polysiloxanes in mixture, and reacts 1~7h again at 60~140 ℃, adds then after meticulous filler particles mixes, again at 90~180 ℃ of reaction 1~6h; After reaction finishes, mixture-0.01~-keep 0.1~1.5h under the 0.08MPa vacuum.At last, cool to room temperature obtains white active matter and is defoaming agent composition.
Specific implementation method
Comparative Examples 1: with reference to US5283004 example 1
Comparative Examples 2: with reference to US5283004 example 18
Embodiment 1
Add 1 in the 5L mixer, 000g viscosity is 1, the dimethyl silicone polymer of the trimethylsiloxy group end-blocking of 000mPas, 20g ethyl orthosilicate and 10g methyl silanol potassium, 1) and the polyether-modified polysiloxanes of 50g (x=100, y=20 mixes polymerization reaction take places at 80 ℃, add 90g MQ resin (M: Q=0.75: then, z=3, g=20, h=12, R "=-H); at 120 ℃ of hybrid reaction 4h, and then adding 80g specific area is 200m 2The vapor phase method hydrophobic silicic aerogels of/g, system are warming up to 160 ℃, and after keeping 2h under this temperature, keep 0.5h under the vacuum of-0.03MPa, and last cool to room temperature obtains white thickness silicone antifoam composition.
Embodiment 2
In the 5L mixer, add 1,000g viscosity is 10, the dimethyl silicone polymer of the trimethylsiloxy group end-blocking of 000mPas, 30g ethyl orthosilicate and 10g potassium hydroxide mix polymerization reaction take place at 100 ℃, 1) and the polyether-modified polysiloxanes (x=50 of 60g adds 100g MQ resin (M: Q=0.65: then, y=8, z=3, g=14, h=8, R "=-CH 3), at 100 ℃ of hybrid reaction 3.5h, adding the 90g specific area then is 300m 2The vapor phase method hydrophobic silicic aerogels of/g continues to be warming up to 180 ℃, and after keeping 2h under this temperature, keeps 0.5h under the vacuum of-0.03MPa, and last cool to room temperature obtains white thickness silicone antifoam composition.
Embodiment 3
In the 5L mixer, add 1,000g viscosity is 5, the dimethyl silicone polymer of the trimethylsiloxy group end-blocking of 000mPas, 20g MTES and 20g methyl silanol potassium, mix polymerization reaction take place at 120 ℃, 1) and the polyether-modified polysiloxanes of 40g (x=150, y=10, z=3 adds 80g MQ resin (M: Q=0.66: then, g=20, h=7, R "=-H), at 110 ℃ of hybrid reaction 3h; Adding the 100g specific area then is 200m 2The hydrophilic white carbon of the vapor phase method of/g continues to be warming up to 140 ℃, and after keeping 5h under this temperature, keeps 0.5h under the vacuum of-0.03MPa, and last cool to room temperature obtains white thickness silicone antifoam composition.
Embodiment 4
In the 5L mixer, add 1,000g viscosity is 100, the dimethyl silicone polymer of the trimethylsiloxy group end-blocking of 000mPas, 25g dimethyldiethoxysilane and 10g sodium methoxide mix polymerization reaction take place at 100 ℃, 1) and the polyether-modified polysiloxanes (x=70 of 80g adds 120gMQ resin (M: Q=0.8: then, y=5, z=3, g=10, h=0, R "=-CH 3), at 120 ℃ of hybrid reaction 5h; Adding the 70g specific area then is 380m 2The hydrophilic white carbon of the vapor phase method of/g continues to be warming up to 180 ℃, and after keeping 1.5h under this temperature, keeps 1h under the vacuum of-0.03MPa, and last cool to room temperature obtains white thickness silicone antifoam composition.
Embodiment 5
In the 5L mixer, add 1,000g viscosity is 60, the dimethyl silicone polymer of the trimethylsiloxy group end-blocking of 000mPas, 45g ethyl orthosilicate and 15g methyl silicon sodium alcoholate mix polymerization reaction take place at 100 ℃, 1) and the polyether-modified polysiloxanes (x=100 of 78g adds 120gMQ resin (M: Q=0.75: then, y=40, z=3, g=18, h=6, R "=-CH 3), at 100 ℃ of hybrid reaction 5h; Adding the 60g specific area then is 150m 2The vapor phase method hydrophobic silicic aerogels of/g continues to be warming up to 170 ℃, and after keeping 1.5h under this temperature, keeps 0.5h under the vacuum of-0.03MPa, and last cool to room temperature obtains white thickness silicone antifoam composition.
Embodiment 6
In the 5L mixer, add 1,000g viscosity is 1, the dimethyl silicone polymer of the trimethylsiloxy group end-blocking of 000mPas, 25g phenyl triethoxysilane and 10g potassium hydroxide mix polymerization reaction take place at 100 ℃, 1) and the polyether-modified polysiloxanes (x=150 of 35g adds 60g MQ resin (M: Q=0.65: then, y=40, z=3, g=4, h=6, R "=-COCH 3), at 100 ℃ of hybrid reaction 5h; Adding the 80g specific area then is 200m 2The vapor phase method hydrophobic silicic aerogels of/g continues to be warming up to 130 ℃, and after keeping 4h under this temperature, keeps 0.5h under the vacuum of-0.03MPa, and last cool to room temperature obtains white thickness silicone antifoam composition.
Embodiment 7
Add 1 in the 5L mixer, 000g viscosity is 80, the dimethyl silicone polymer of the trimethylsiloxy group end-blocking of 000mPas, 25g ethyl triethoxysilane and 10g sodium methoxide, 1) and the polyether-modified polysiloxanes of 35g (x=200, y=10 mixes polymerization reaction take places at 120 ℃, add 100gMQ resin (M: Q=0.75: then, z=3, g=7, h=3, R "=-H); at 110 ℃ of hybrid reaction 3.5h, adding the 100g specific area then is 200m 2The vapor phase method hydrophobic silicic aerogels of/g continues to be warming up to 150 ℃, and after keeping 3.5h under this temperature, keeps 0.5h under the vacuum of-0.03MPa, and last cool to room temperature obtains white thickness silicone antifoam composition.
The defoaming agent composition performance test
Sodium dodecyl benzene sulfonate aqueous solution with 0.5% (mass percent) is the foaming medium, adopts and shakes a bottle method test.Method of testing is as follows: the above-mentioned foaming medium of addition 50mL in the 100mL tool plug graduated cylinder, and then add the test defoaming agent composition of 0.010g, leave standstill behind the shake 50 times in vertical direction, and it is foam time T that the record foam disappears to the liquid level time occurring 50, shake writes down foam time T 50 times again 100, reaching till 400 times until always shaking a bottle number of times, the time is short more, and then defoaming agent composition disappears, and to press down the bubble effect good more.
The antifoam performance test result of the various defoaming agent compositions that embodiment and Comparative Examples are prepared is as shown in table 1, the data by table 1 as can be seen, the antifoam performance of example 1~7 is all good than Comparative Examples.From table 2 with the result of the test of the defoaming agent composition of the technical program preparation and the contrast of the defoamer sample antifoam performance on the market as can be seen, the antifoam performance of example 5 obviously is better than the defoamer sample W and the Z of market appearance again.This just illustrates that defoaming agent composition of the present invention has stronger froth breaking ability in the anion system.
The antifoam performance contrast of the various silicone antifoam compositions of table 1
Table 2 contrasts with the defoaming agent composition and the defoamer sample antifoam performance on the market of the technical program preparation
Figure G2009101843850D00062

Claims (5)

1, a kind of defoaming agent composition is characterized in that it is made up of following material:
(1) polysiloxane, the general structure of polysiloxane is as follows:
R aSiO (4-a)/2
Wherein, the value of a is 1.9~2.2, and R is identical or different in the molecular structure, and the carbon number that it comprises the replacement of hydrogen atom, monovalence or non-replacement is 1~20 alkyl; The dynamic viscosity of described polysiloxane in the time of 25 ℃ is 1,000~300,000mPas;
(2) coupling agent, be selected from MTMS, MTES, phenyl triethoxysilane, methyl triacetic acid base silane, tetraethoxysilane, ethyl orthosilicate, dimethyl diethoxy siloxanes, the ethyl triethoxysilane one or more, per 100 parts polysiloxane adds 0.5~20 part coupling agent;
(3) meticulous filler particles is meant the oxide of silicon, magnesium, zinc, aluminium to comprise silica, magnesia, zinc oxide, alundum (Al that these meticulous filler particles use separately or mix and use; Per 100 parts polysiloxane adds 0.1~20 part meticulous filler particles;
(4) organic siliconresin is for by chain link M unit R ' 3SiO 1/2With chain link Q cell S iO 4/2The MQ resin of forming, the mol ratio between the two is (0.4~1.2): 1.0, wherein the R ' in the M cellular construction formula is identical or different, and the carbon number that comprises the replacement of hydrogen atom, monovalence or non-replacement is 1~20 alkyl; Per 100 parts polysiloxane adds 1~20 part organic siliconresin;
(5) polyether-modified polysiloxanes, its molecular structural formula is as follows: MD x(CH 3GSiO) yM
Wherein, M is identical with M unit in the organic siliconresin, is chain link R ' 3SiO 1/2, D is chain link R ' 2SiO 2/2, the R ' span of two structural formulas is identical; G is a polyether group, and general structure is-(CH 2) z(EO) g(PO) hR ", R in the formula " be-H or-CH 3Or-COCH 3Subscript x in above-mentioned each structural formula, y, z, g, h are the degree of polymerization, x is 10~500 integer; Y is 1~50 integer; Z is 2~6 integer; G is 1~36 integer; H is 0~20 integer; The average viscosity of described polyether-modified polysiloxanes under 25 ℃ is 10~30,000mPas; Add 0.1~50 part of described polyether-modified polysiloxanes in per 100 parts polysiloxane;
(6) base catalyst, be selected from NaOH, potassium hydroxide, cesium hydroxide, methyl silanol potassium, methyl silicon sodium alcoholate, sodium methoxide, caustic alcohol, potassium methoxide, potassium ethoxide, beta-hydroxyethyl Trimethylamine or TMAH, will add 0.1~10 part of base catalyst in per 100 parts polysiloxane.
2, the described a kind of defoaming agent composition of claim 1 is characterized in that (1) described polysiloxane is the dimethyl silicone polymer of trimethylsiloxy group end-blocking.
3, the described a kind of defoaming agent composition of claim 1 is characterized in that (3) described meticulous filler particles is a silica, is commonly called as white carbon, comprises precipitated silica, fume colloidal silica.
4, the described a kind of defoaming agent composition of claim 3 is characterized in that described meticulous filler particles is a fume colloidal silica, and its specific area is 20~800m 2/ g.
5, the described a kind of defoaming agent composition of preparation claim 1, its characterization step comprises:
(1) polysiloxane and coupling agent heat up in stirrer for mixing, add the base catalyst polymerization reaction take place in the time of 40~140 ℃;
(2) crosslinked back takes place and adds organic siliconresin and polyether-modified polysiloxanes in mixture, and reacts 1~7h again at 60~140 ℃, adds then after meticulous filler particles mixes, again at 90~180 ℃ of reaction 1~6h;
(3) after reaction finishes, mixture-0.01~-keep 0.1~1.5h under the 0.08MPa vacuum, last, cool to room temperature obtains white active matter and is defoaming agent composition.
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