CN102489048B - Antifoaming agent composition and preparation method thereof - Google Patents
Antifoaming agent composition and preparation method thereof Download PDFInfo
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- CN102489048B CN102489048B CN201110439608.0A CN201110439608A CN102489048B CN 102489048 B CN102489048 B CN 102489048B CN 201110439608 A CN201110439608 A CN 201110439608A CN 102489048 B CN102489048 B CN 102489048B
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Abstract
The invention provides an antifoaming agent composition and a preparation method thereof. The antifoaming active matter is prepared by carrying out a reaction of hydrogen-containing polysiloxane and vinyl polysiloxane, introducing polyether modified polyorganosiloxane, mixing the mixture with silicon dioxide and silicone resin; and the obtained antifoaming active matter has excellent defoaming speed and antifoaming performance in an anion and a nonionic foaming system. The addition of the silicon polyether effectively controls the degree of crosslinking and enhances affinity of the antifoaming active matter with water. The prepared antifoaming active matter can be applied to weaving printing and dyeing, pulping papermaking and sewerage treatment, etc.
Description
Technical field
The present invention relates to a kind of based on hydrogeneous polysiloxane and the reaction of vinyl polysiloxane, and introduce therein the preparation of the defoaming agent composition of Siloxane-Oxyalkylene Copolymers, said composition has excellent antifoaming performance in anion, nonionic bubbling system.Defoaming agent composition belongs to fine chemicals, therefore, the invention belongs to technical field of fine chemical preparations.
Background technology
Foam is phenomenon common in live and work.But foam can bring great harm sometimes in industrial production, such as reduce machine operating efficiency, incur loss through delay working time, affect the quality of product etc.The method of eliminating harmful foam mainly contains physical method and chemical method, and defoamer froth breaking is one of chemical method.Along with the significantly raising of industrial enterprise's production scale and production efficiency, 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 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, also has good froth breaking ability and the lasting bubble ability that presses down simultaneously in the situation that consumption is very low, thereby, favored very much.
Froth breaking active matter is the core of defoamer, and its antifoaming speed and suds suppressing properties directly affect 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 processed and is obtained through specific process technology by dimethyl silicone polymer and silica, as the defoaming agent composition that US3383327 introduces.But because it can not press down bubble lastingly, suds suppressing properties is poor, therefore, researcher both domestic and external has carried out large-scale expansion research to its performance.US4338217A1 replaces common polysiloxanes and silicon dioxide granule mixed processing to make froth breaking active matter with alkoxy polysiloxane; US5824739 introducing amino silicones or carboxyl polysiloxanes, as the main body of froth breaking active matter, obtain defoaming composition with silica mixed processing; EP163541B1 introduces with the polysiloxanes containing terminal hydroxyl and react formation side chain polysiloxane with the polysiloxane containing 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 emulsion dispersion in water.US5153258 introduces and introduce the antifoaming performance that lightly crosslinked polysiloxane can improve composition in system, for example containing vinyl polysiloxane and hydrogeneous polysiloxane, hydroxyl polysiloxane and alkyl silicate, under the effect of catalyst, cross-linking reaction occurs, but crosslinking degree is difficult to control.In WO2007137948A1, introduced after hydrogeneous polysiloxane and the reaction of vinyl polysiloxane, the dimethyl silicone polymer dilution that adds trimethylsiloxy group end-blocking, when in above-mentioned patent, hydrogeneous polysiloxane and vinyl polysiloxane react, viscosity is large, wayward, the defoaming agent composition antifoaming performance obtaining is poor.CN1931417A discloses a kind of defoaming agent composition of high temperature resistant resistance to highly basic, it is obtained by polysiloxanes and organic siliconresin cross-linking reaction, active matter is prepared into after emulsion to bubbling test performance in black liquor, it has good suds suppressing properties, but antifoaming speed needs further to be improved, and, because froth breaking active matter viscosity is larger, be dispersed in water difficult.
EP-A341952 introduces and uses the silicone antifoam agent of branching and the composition of polyether-polysiloxane copolymers as defoamer, for pulp production.US5523019 introduces the composition of mineral oil and polyether-polysiloxane copolymers as defoamer, it is said and has positive effect.According to WO 98/000216, the siloxanes that contains dimethyl-3-hydroxypropyl-polyoxyethylene polyoxypropylene group is specially suitable surfactant in defoamer formulation.
The present invention reacts based on hydrogeneous polysiloxane and vinyl polysiloxane by a kind of, and introduce therein Siloxane-Oxyalkylene Copolymers, with silica, organic siliconresin mixed processing, the froth breaking active matter obtaining has good antifoaming speed and suds suppressing properties in anion, nonionic bubbling system.After adding Siloxane-Oxyalkylene Copolymers, effectively control crosslinking degree, and increased the affinity of froth breaking active matter and water.The froth breaking active matter obtaining can be for textile printing and dyeing, the aspects such as pulping and paper-making, sewage disposal.
Summary of the invention
A kind of preparation of defoaming agent composition provides a kind of defoaming composition based on polysiloxanes, there is viscosity low, easily disperse, in various systems, there is very fast antifoaming speed and the good characteristics such as suds suppressing properties, can be widely used in harmful foam of eliminating in industrial production.
Technical scheme
, it is characterized in that it is comprised 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 molecular structure can be identical or different, and the alkyl that the substituted or non-substituted carbon number that comprises hydrogen atom or monovalence is 1～20, specifically comprises: methyl, ethyl, propyl group, n-pro-pyl, butyl, isobutyl group, phenyl, benzyl, amino.The dynamic viscosity of this polysiloxane in the time of 25 ℃ is 50～10,000mPas.The consumption of polysiloxane is 40～75% of defoaming agent composition gross mass.
B. hydrogeneous polysiloxane
At least one general structure is following hydrogeneous polysiloxane:
H
cR
1 3-cSiO(SiR
1HO)
d(SiR
1 2O)
bSiR
1 3-cH
c
Substituent R
1identical or different, be the alkyl of carbon number 1～20, the concrete alkyl that comprises, as methyl, ethyl, propyl group, n-pro-pyl, butyl, isobutyl group; Aryl, as phenyl, benzyl, preferred more than 80% substituent group R
1it is methyl.Subscript c is 0,1 or 2, and subscript d is 0 or 1～200 integer, and c+d >=1, and subscript b is 1～1000 integer, and each molecule has the hydrogen atom of at least 1 silicon bonding, preferably the hydrogen atom of at least 2 silicon bondings.
The dynamic viscosity of described hydrogeneous polysiloxane in the time of 25 ℃ is 20～5,000mPas, and the consumption of hydrogeneous polysiloxane is 10～30% of defoaming agent composition gross mass.
C. vinyl polysiloxane
At least one general structure is following vinyl polysiloxanes:
Vi
eR
2 3-eSiO(SiR
2ViO)
f(SiR
2 2O)
gSiR
2 3-eVi
e
Substituent R
2identical or different, be the alkyl of carbon number 1～20, the concrete alkyl that comprises, as methyl, ethyl, propyl group, n-pro-pyl, butyl, isobutyl group; Aryl, as phenyl, benzyl, preferred more than 80% substituent group R
2it is methyl.Vi is vinyl, and subscript e is 0 or 1, and subscript f is 0 or 1～200 integer, and e+f >=1, and subscript g is 1～600 integer, and each molecule has the vinyl groups of at least 1 silicon bonding, preferably the vinyl groups of at least 2 silicon bondings.
The dynamic viscosity of described vinyl polysiloxane in the time of 25 ℃ is 50～2,000mPas, and the consumption of vinyl polysiloxane is 1～50% of defoaming agent composition gross mass.
D. silica
It is divided into two kinds of precipitated silica and fumed silicas by manufacture method, by surface nature, is divided into two kinds of hydrophilic silicon dioxide and hydrophobic silicas.The present invention is preferably hydrophobic silica, comprises vapor phase method hydrophobic silica and precipitation method hydrophobic silica, and its specific area is 50～500m
2/ g.The consumption of silica is 1～5% of defoaming agent composition gross mass.
E. organic siliconresin
Organic siliconresin refers to the cancellated polysiloxane in highly cross-linked space, this cancellated polysiloxane is normally hydrolyzed in as toluene at organic solvent by the various mixtures of methyl trichlorosilane, dimethyldichlorosilane, phenyl trichlorosilane, diphenyl dichlorosilane or dichloromethyl phenylsilane, obtain acidic hydrolysis thing, then through washing, remove disacidify, obtain product.The organic siliconresin that the present invention uses is by chain link CH
3siO
1/2(in organosilicon chemistry, being called M unit) and chain link SiO
4/2the MQ resin that the unit of (Q unit) forms, the mol ratio between the two is (0.4～1.2): 1.0, preferably (0.5～0.8): 1.0.The consumption of organic siliconresin is 2～10% of defoaming agent composition gross mass.
F. catalyst
Catalyst is used for the hydrogeneous polysiloxane of catalyst component and vinyl polysiloxane polymerization reaction take place.Catalyst is selected from platinum-ol complex compound, platinum-alkene complex, platinum-ol salt complex, platinum-ether complexes, platinum-one complex compound, isopropyl alcohol solution of chloroplatinic acid, platinum-vinyl complex compound.The consumption of described catalyst is 0.01～0.05% of defoaming agent composition gross mass.
G, Siloxane-Oxyalkylene Copolymers
By hydrogen containing siloxane and the polyethers that contains unsaturated bond, under the effect of catalyst, occurred that addition reaction prepares.The described Siloxane-Oxyalkylene Copolymers preferably average viscosity at 25 ℃ is 10～30,000mPas, is preferably at 25 ℃ 60～5,000mPas.The structural formula of Siloxane-Oxyalkylene Copolymers is as follows:
MD
x(CH
3GSiO)
yM
Wherein, M is identical with the M unit in organic siliconresin, is chain link CH
3siO
1/2, D is chain link CH
2siO
2/2; G is polyether group, represents :-(CH with general structure below
2)
zo (EO)
h(PO)
ir
3, R
3alkyl for the substituted or non-substituted carbon number of hydrogen atom, carboxyl, methoxyl group or monovalence is 1～4, comprises methyl, ethyl, propyl group, butyl, and EO is oxirane, and PO is expoxy propane; Above-mentioned each structural formula subscript x, y, z, h, i is the degree of polymerization, the integer that x is 10～500; Y is 1～50 integer; Z is 2～6 integer; H is 1～36 integer; I is 0～50 integer.The consumption of Siloxane-Oxyalkylene Copolymers is 1～10% of defoaming agent composition gross mass.
The preparation method of defoaming agent composition of the present invention is as follows:
1. polysiloxane, hydrogeneous polysiloxane, vinyl polysiloxane, Siloxane-Oxyalkylene Copolymers and/or hydrophobic silica are mixed in beaker, and heating, in the time of 40～140 ℃, add catalyst, react 0.5～5h;
2. after completion of the reaction, add organic siliconresin, and/or hydrophobic silica, and at 60～150 ℃ of reaction 1～5h;
3. after completion of the reaction, mixture is maintained to 0.1～1.5h under-0.01～-0.08MPa vacuum, last cool to room temperature, obtains defoaming agent composition.
the specific embodiment
Embodiment 1
In 1000mL beaker, drop into the dimethyl silicone polymer of the trimethylsiloxy group end-blocking that 200g viscosity is 100mPas, the hydrogeneous poly-radical siloxane Me that has of side chain that 100g viscosity is 20mPas
3siO (MeHSiO)
2(Me
2siO)
20siMe
3, the bi-vinyl end-blocking polysiloxane ViMe that 60g viscosity is 150mPas
2siO (Me
2siO)
135siMe
2vi and 36g Siloxane-Oxyalkylene Copolymers (x=100, y=20, z=3, h=20, i=40, R
3=-H).Heat temperature raising adds 0.096g isopropyl alcohol solution of chloroplatinic acid in the time of 60 ℃, insulation 0.5h; Then adding 18g specific area is 200m
2the vapor phase method hydrophobic silica of/g and 18gMQ resin (M: Q=0.75: 1), system is warming up to 120 ℃, and maintains after 4h at this temperature, under the vacuum of-0.03MPa, maintains 0.5h, cool to room temperature obtains the defoaming agent composition that viscosity is 7,000mPas.
Embodiment 2
In 1000mL beaker, drop into the dimethyl silicone polymer of the phenyl dimethylsilyl bis end-blocking that 200g viscosity is 1,000mPas, 100g viscosity is the hydrogeneous dimethyl silicone polymer Me of 100mPas side chain
3siO (MeHSiO)
3(Me
2siO)
69siMe
3, the bi-vinyl end-blocking polysiloxane ViMe that 78g viscosity is 600mPas
2siO (Me
2siO)
380siMe
2vi and 15g Siloxane-Oxyalkylene Copolymers (x=50, y=8, z=3, h=14, i=8, R
3=-CH
3).Heat temperature raising adds 0.1g isopropyl alcohol solution of chloroplatinic acid in the time of 100 ℃, insulation 0.25h; Then adding 15g specific area is 150m
2the vapor phase method hydrophobic silica of/g and 38g MQ resin (M: Q=0.65: 1), system is warming up to 140 ℃, and maintains after 3h at this temperature, under the vacuum of-0.03MPa, maintains 0.5h, cool to room temperature obtains the defoaming agent composition that viscosity is 10,000mPas.
Embodiment 3
In 1000mL beaker, drop into the dimethyl silicone polymer of the amino dimethylsilyl bis end-blocking that 200g viscosity is 1,000mPas, 100g viscosity is the hydrogeneous dimethyl silicone polymer Me of 1500mPas side chain
3siO (MeHSiO)
36(Me
2siO)
500siMe
3, the bi-vinyl end-blocking polysiloxane ViMe that 38g viscosity is 1000mPas
2siO (Me
2siO)
450siMe
2vi and 15g Siloxane-Oxyalkylene Copolymers (x=150, y=10, z=3, h=20, i=7, R
3=-CH
3).Heat temperature raising adds 0.1g isopropyl alcohol solution of chloroplatinic acid in the time of 50 ℃, insulation 2h; Then adding 15g specific area is 90m
2the precipitation method hydrophobic silica of/g and 17g MQ resin (M: Q=065: 1), system is warming up to 90 ℃, and maintains after 3h at this temperature, under the vacuum of-0.06MPa, maintains 1h, cool to room temperature obtains the defoaming agent composition that viscosity is 12,600mPas.
Embodiment 4
In 1000mL beaker, drop into the dimethyl silicone polymer of the trimethylsiloxy group end-blocking that 200g viscosity is 50mPas, 100g viscosity is the hydrogeneous dimethyl silicone polymer Me of 800mPas side chain
3siO (MeHSiO)
18(Me
2siO)
150siMe
3, the side chain that 315g viscosity is 100mPas is containing vinyl polysiloxane Me
3siO (ViMeSiO)
2(Me
2siO)
70siMe
3, 30g specific area is 90m
2the precipitation method hydrophobic silica of/g and 15g Siloxane-Oxyalkylene Copolymers (x=70, y=5, z=3, h=35, i=0, R
4=-CH
2cH
3).Heat temperature raising adds 0.3g isopropyl alcohol solution of chloroplatinic acid in the time of 80 ℃, insulation 0.5h; Then add 18g MQ resin (M: Q=0.58: 1), and maintain after 3h, maintain 1h under the vacuum of-0.06MPa, cool to room temperature obtains the defoaming agent composition that viscosity is 6,500mPas at this temperature.
Embodiment 5
In 1000mL beaker, drop into the dimethyl silicone polymer of the amino dimethylsilyl bis end-blocking that 460g viscosity is 10,000mPas, 100g viscosity is the poly-organic hydrogen-containing siloxane HMe of the two hydrogen end-blockings of 30mPas
2siO (Me
2siO)
16siMe
2h, the side chain that 15g viscosity is 300mPas is containing vinyl polysiloxane Me
3siO (ViMeSiO)
2(Me
2siO)
220siMe
3, 23g specific area is 380m
2the vapor phase method hydrophobic silica of/g and 12g Siloxane-Oxyalkylene Copolymers (x=100, y=40, z=3, h=1, i=50, R
3=-H).Heat temperature raising adds 0.08g isopropyl alcohol solution of chloroplatinic acid in the time of 120 ℃, insulation 0.5h; Then add 45g MQ resin (M: Q=0.8: 1), be warming up to 150 ℃, maintain after 3h, maintain 1.5h under the vacuum of-0.06MPa, cool to room temperature obtains the defoaming agent composition that viscosity is 35,000mPas at this temperature.
Embodiment 6
In 1000mL beaker, drop into the dimethyl silicone polymer of the trimethylsiloxy group end-blocking that 640g viscosity is 1000mPas, 100g viscosity is the poly-organic hydrogen-containing siloxane HMe of the two hydrogen end-blockings of 50mPas
2siO (Me
2siO)
66siMe
2h, the bi-vinyl end-blocking polysiloxane ViMe that 28g viscosity is 2000mPas
2siO (Me
2siO)
510siMe
2vi, 23g specific area is 110m
2the precipitation method hydrophobic silica of/g and 38g Siloxane-Oxyalkylene Copolymers (x=150, y=40, z=3, h=4, i=6, R
4=-COCH
3).Heat temperature raising adds 0.13g isopropyl alcohol solution of chloroplatinic acid in the time of 130 ℃, insulation 3h; Then add 38g MQ resin (M: Q=0.65: 1), and maintain after 5h, maintain 1h under the vacuum of-0.08MPa, cool to room temperature obtains the defoaming agent composition that viscosity is 9,500mPas at this temperature.
Comparative example 1
In 1000mL beaker, drop into the dimethyl silicone polymer of the amino dimethylsilyl bis end-blocking that 200g viscosity is 1,000mPas, 100g viscosity is the hydrogeneous dimethyl silicone polymer Me of 1500mPas side chain
3siO (MeHSiO)
36(Me
2siO)
500siMe
3with the 38g viscosity bi-vinyl end-blocking polysiloxane ViMe that is 1000mPas
2siO (Me
2siO)
450siMe
2vi.Heat temperature raising adds 0.1g isopropyl alcohol solution of chloroplatinic acid in the time of 50 ℃, insulation 2h; Then adding 15g specific area is 90m
2the precipitation method hydrophobic silica of/g and 17g MQ resin (M: Q=0.65: 1), system is warming up to 90 ℃, and maintains after 3h at this temperature, under the vacuum of-0.06MPa, maintains 1h, cool to room temperature obtains the defoaming agent composition that viscosity is 482,600mPas.
Comparative example 2
In 1000mL beaker, drop into the dimethyl silicone polymer of the trimethylsiloxy group end-blocking that 200g viscosity is 50mPas, 100g viscosity is the hydrogeneous dimethyl silicone polymer Me of 800mPas side chain
3siO (MeHSiO)
18(Me
2siO)
350siMe
3, the side chain that 315g viscosity is 100mPas is containing vinyl polysiloxane Me
3siO (ViMeSiO)
2(Me
2siO)
70siMe
3, 30g specific area is 90m
2the precipitation method hydrophobic silica of/g.Heat temperature raising adds 0.3g isopropyl alcohol solution of chloroplatinic acid in the time of 80 ℃, insulation 0.5h; Then add 18g MQ resin (M: Q=0.58: 1), and maintain after 3h, maintain 1h under the vacuum of-0.06MPa, cool to room temperature obtains the defoaming agent composition that viscosity is 262,500mPas at this temperature.
Defoaming agent composition performance test
Method of testing: the sodium dodecyl benzene sulfonate aqueous solution of 0.5% (mass percent) of take is foaming medium, toward the above-mentioned foaming medium of addition 50mL in 100mL tool plug graduated cylinder, then the defoaming agent composition that adds 0.010g, standing after shake 50 times in vertical direction, record foam and disappear to there is the liquid level time, be foam time T
50, then shake records foam time T 50 times
100, every jolting is just recorded foam time 50 times, until total shaking flask number of times reaches 400 times, under identical jolting number of times, foam time is shorter, represents that disappearing of defoaming agent composition pressed down bubble effect better.Test result is in Table 1:
The antifoam performance contrast of table 1 defoaming agent composition
| Foam time/s | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Comparative example 1 | Comparative example 2 |
| T 50 | 5 | 4 | 2 | 3 | 6 | 3 | 5 | 5 |
| T 100 | 5 | 4 | 2 | 4 | 5 | 3 | 10 | 5 |
| T 150 | 6 | 4 | 3 | 4 | 6 | 4 | 11 | 7 |
| T 200 | 7 | 5 | 3 | 4 | 6 | 3 | 19 | 10 |
| T 250 | 8 | 4 | 4 | 3 | 7 | 3 | - | 14 |
| T 300 | 7 | 6 | 5 | 4 | 8 | 4 | - | 16 |
| T 350 | 9 | 6 | 5 | 6 | 9 | 6 | - | 19 |
| T 400 | 10 | 7 | 5 | 5 | 9 | 6 | - | 21 |
From upper table result, can find out, the antifoam performance of the defoaming agent composition of embodiment 1～6 is better than comparative example, and this illustrates that defoaming agent composition of the present invention has stronger froth breaking ability in anion system.And the defoaming agent composition viscosity that the present invention obtains is obviously little than resulting defoaming agent composition in comparative example, the defoaming agent composition viscosity that comparative example obtains is very large, is difficult to emulsion dispersion.
Claims (4)
1. a preparation method for defoaming agent composition, is characterized in that, described defoaming agent composition is composed of the following components:
(1) polysiloxane, general structure is: R
asiO
(4-a)/ 2, wherein the value of a is that 1.9～2.2, R is the alkyl that the substituted or non-substituted carbon number of hydrogen atom or monovalence is 1～20, can be identical or different; The dynamic viscosity of described polysiloxane in the time of 25 ℃ is 50～10,000mPas, and consumption is 40～75% of defoaming agent composition gross mass;
(2) hydrogeneous polysiloxane, at least comprises a kind of following general structure:
H
cR
1 3-cSiO(SiR
1HO)
d(SiR
1 2O)
bSiR
1 3-cH
c
Wherein, R
1for the alkyl of carbon number 1～20, identical or different; Subscript c is 0,1 or 2, and subscript d is 0 or 1～200 integer, and c+d>=1, and subscript b is 1～1000 integer, and each molecule has the hydrogen atom of at least 1 silicon bonding; The dynamic viscosity of described hydrogeneous polysiloxane in the time of 25 ℃ is 20～5,000mPas, and consumption is 10～30% of defoaming agent composition gross mass;
(3) vinyl polysiloxane, at least comprises a kind of following general structure:
Vi
eR
2 3-eSiO(SiR
2ViO)
f(SiR
2 2O)
gSiR
2 3-eVi
e
R wherein
2span and R
1identical; Vi is vinyl, and subscript e is 0 or 1, and subscript f is 0 or 1～200 integer, and e+f>=1, and subscript g is 1～600 integer, and each molecule has the vinyl groups of at least 1 silicon bonding; The dynamic viscosity of described vinyl polysiloxane in the time of 25 ℃ is 50～2,000mPas, and consumption is 1%～50% of defoaming agent composition gross mass;
(4) silica, consumption is 1～5% of defoaming agent composition gross mass;
(5) organic siliconresin, for by chain link CH
3siO
1/2with chain link SiO
4/2the organic siliconresin forming, the mol ratio between the two is (0.4～1.2): 1.0, consumption is 2～10% of defoaming agent composition gross mass;
(6) catalyst, be selected from platinum-ol complex compound, platinum-alkene complex, platinum-ol salt complex, platinum-ether complexes, platinum-one complex compound, isopropyl alcohol solution of chloroplatinic acid, platinum-vinyl complex compound, consumption is 0.01～0.05% of defoaming agent composition gross mass;
(7) Siloxane-Oxyalkylene Copolymers, structural formula is: MD
x(CH
3gSiO)
ym, wherein, M chain link CH
3siO
1/2, D is chain link CH
2siO
2/2; G is polyether group, represents :-(CH with general structure below
2)
zo (EO)
h(PO)
ir
3, R
3for the alkyl that the substituted or non-substituted carbon number of hydrogen atom, carboxyl, methoxyl group or monovalence is 1～4, EO is oxirane, and PO is expoxy propane; Subscript x, y, z, h, i is the degree of polymerization, the integer that x is 10～500; Y is 1～50 integer; Z is 2～6 integer; H is 1～36 integer; I is 0～50 integer; Average viscosity at 25 ℃ is 10～30,000mPas, and consumption is 1～10% of defoaming agent composition gross mass;
Described defoaming agent composition is prepared by the following method:
1. polysiloxane, hydrogeneous polysiloxane, vinyl polysiloxane, Siloxane-Oxyalkylene Copolymers and silica are mixed in beaker, and heating, in the time of 40～140 ℃, add catalyst, react 0.5～5h;
2. after completion of the reaction, add organic siliconresin, and/or silica, and at 60～150 ℃ of reaction 1～5h;
3. after completion of the reaction, mixture is maintained to 0.1～1.5h under-0.01～-0.08MPa vacuum, last cool to room temperature, obtains defoaming agent composition.
2. the preparation method of a kind of defoaming agent composition according to claim 1, is characterized in that, wherein (4) described silica is hydrophobic silica, and its specific area is 50～500m
2/ g.
3. the preparation method of a kind of defoaming agent composition according to claim 1, is characterized in that, wherein chain link CH in the organic siliconresin described in (5)
3siO
1/2with chain link SiO
4/2mol ratio is preferably (0.5～0.8): 1.0.
4. the preparation method of a kind of defoaming agent composition according to claim 1, is characterized in that, wherein (7) described Siloxane-Oxyalkylene Copolymers average viscosity at 25 ℃ is preferably 60～5,000mPas.
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| CN107115694A (en) * | 2016-08-31 | 2017-09-01 | 江苏四新科技应用研究所股份有限公司 | A kind of silicon composition and its preparation, application |
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| CN102698475B (en) * | 2012-06-29 | 2014-02-26 | 南京四新科技应用研究所有限公司 | Defoaming composition |
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