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A technology of composition and defoamer, which is applied in the direction of foam dispersion/prevention, chemical/physical process, dissolution, etc., and can solve the problems of further improvement of defoaming speed, high viscosity of defoaming active substances, and difficulty in dispersion
Active Publication Date: 2010-01-27
JIANGSU SIXIN SCI-TECH APPL RES INST CO LTD
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US5153258 introduces the introduction of lightly cross-linked polyorganosiloxane into the system to improve the antifoaming performance of the composition, such as vinyl-containing polyorganosiloxane and hydrogen-containing polyorganosiloxane, hydroxyl-containing polyorganosiloxane Alkanes and alkyl silicates undergo crosslinking reactions under the action of catalysts, but the degree of crosslinking is difficult to control
CN1931417A discloses a high-temperature-resistant and strong-alkali-resistant defoamer composition, which is obtained by the crosslinking reaction of polysiloxane and organosilicon resin. After the active substance is prepared into an emulsion, the performance is tested by bubbling in black liquor. It has good antifoaming performance, but the defoaming speed needs to be further improved, and because the antifoaming active substance has a high viscosity, it is quite difficult to disperse it in water
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Embodiment 1
[0029]Add 1,000g of trimethylsiloxy-terminated polydimethylsiloxane with a viscosity of 1,000mPa·s, 20g of tetraethyl orthosilicate and 10g of potassium methylsiliconate in a 5L mixer, and mix and polymerize at 80°C Reaction, then add 90g MQ resin (M:Q=0.75:1) and 50g polyether modified polysiloxane (x=100, y=20, z=3, g=20, h=12, R"= -H), mixed and reacted at 120°C for 4h, and then added 80g of 2 / g of vapor-phase method hydrophobic silica, the system is heated up to 160°C, and maintained at this temperature for 2h, then maintained at -0.03MPa vacuum for 0.5h, and finally cooled to room temperature to obtain a white viscous silicone defoamer combination.
Embodiment 2
[0031] Add 1,000g of trimethylsiloxy-terminated polydimethylsiloxane with a viscosity of 10,000mPa·s, 30g of tetraethyl orthosilicate and 10g of potassium hydroxide into a 5L mixer, and mix at 100°C for polymerization. Then add 100g MQ resin (M:Q=0.65:1) and 60g polyether modified polysiloxane (x=50, y=8, z=3, g=14, h=8, R”=-CH 3 ), mixed and reacted at 100°C for 3.5h, then added 90g of 2 / g of gas-phase method hydrophobic silica, continue to heat up to 180°C, and maintain at this temperature for 2h, then maintain at -0.03MPa vacuum for 0.5h, and finally cool to room temperature to obtain a white viscous silicone defoamer combination.
Embodiment 3
[0033] Add 1,000g of trimethylsiloxy-terminated polydimethylsiloxane with a viscosity of 5,000mPa·s, 20g of methyltriethoxysilane and 20g of potassium methylsiliconate into a 5L mixer, and mix at 120°C Polymerization takes place, then add 80g MQ resin (M:Q=0.66:1) and 40g polyether modified polysiloxane (x=150, y=10, z=3, g=20, h=7, R ”=-H), mixed reaction at 110°C for 3h; then add 100g specific surface area of 200m 2 / g of gas-phase method hydrophilic silica, continue to heat up to 140°C, and maintain at this temperature for 5h, then maintain at -0.03MPa vacuum for 0.5h, and finally cool to room temperature to obtain white viscous silicone defoaming agent composition.
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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
technical field [0001] The present invention relates to the preparation of a general-purpose defoamer composition based on polyorganosiloxane into which polyether modified polysiloxane is introduced. The composition has excellent performance in anionic and nonionic foaming systems Defoaming properties. The defoamer composition belongs to fine chemicals, therefore, the present invention belongs to the technical field of fine chemical preparations. technical background [0002] Bubbles are a common phenomenon in life and work. However, in industrial production, sometimes foam can cause great harm, such as reducing the working efficiency of machines, delaying working hours, and affecting product quality. There are mainly physical methods and chemical methods to eliminate harmful foam, and defoamer defoaming is one of the chemical methods. With the substantial increase in the production scale and production efficiency of industrial enterprises, defoamers and defoamers have be...
Claims
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