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Solvent-free method for preparing polyether modified polysiloxane antifoaming agent

A polysiloxane defoamer and polyether modification technology, which is applied in the direction of foam dispersion/prevention, ink, household appliances, etc., can solve the problems of unfriendly organic solvents, turbid products, low purity, etc., and achieve transparent products. Increased reaction rate and high purity

Active Publication Date: 2013-03-20
KUSN ZHANGPU COLOR PRINTING FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a solvent-free method for preparing polyether-modified polysilox

Method used

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  • Solvent-free method for preparing polyether modified polysiloxane antifoaming agent

Examples

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Example

[0028] Example 1 to Example 5: A method for preparing polyether modified polysiloxane defoamer without solvent

[0029] In the reactor, add the allyl-terminated polyether after the water has been removed by rotary evaporation, then add nitrogen gas, and then add 0.0302 grams of antioxidant 264; add 900μg of platinum catalyst to the reactor, while heating the reactor and stirring , The heating temperature provided is between 50~60℃; then add low-hydrogen silicone oil and 4A molecular sieve accounting for 5%~10% of the total mass of the reactants into the reactor, the bulk density of the 4A molecular sieve is 0.69~ 0.75 g / ml, and the effective pass rate is greater than or equal to 97%. At this time, the hydrosilylation reaction begins. Because the reaction is an exothermic reaction, the temperature in the reactor rises sharply. After the temperature stabilizes, control the temperature in the reactor Stir at 80°C and constant temperature for 1.5 hours; add hydrochloric acid or sulfu...

Example

[0032] Example 6~Example 10: A method for preparing polyether modified polysiloxane defoamer without solvent

[0033] In the reactor, add the allyl-terminated polyether after the water has been removed by rotary evaporation, then add nitrogen gas, and then add 0.0302 grams of antioxidant 264; add 900μg of platinum catalyst to the reactor, while heating the reactor and stirring , The heating temperature provided is at 50°C; then add low-hydrogen silicone oil and 4A molecular sieves accounting for 5% to 10% of the total mass of the reactants into the reactor, the bulk density of the 4A molecular sieve is 0.69 to 0.75 g / ml , The effective pass rate is greater than or equal to 97%, and the hydrosilylation reaction begins at this time. Because the reaction is an exothermic reaction, the temperature in the reactor rises sharply. After the temperature stabilizes, the temperature in the reactor is controlled at 70°C. , 80 ℃, 90 ℃, 100 ℃, 110 ℃, and constant temperature stirring for 1.5 h...

Example

[0035] Example 11~Example 15: A method for preparing polyether modified polysiloxane defoamer without solvent

[0036] In the reactor, add the allyl-terminated polyether after the water has been removed by rotary evaporation, and then add nitrogen gas, and then add 0.0302 grams of antioxidant 264; add 600μg, 900μg, 1200μg, 1500μg, 1800μg platinum to the reactor The catalyst is heated and stirred at the same time in the reactor, and the heating temperature provided is 60°C; then low-hydrogen silicone oil and 4A molecular sieve accounting for 5% to 10% of the total mass of the reactants are added to the reactor. The accumulation of the 4A molecular sieve The density is 0.69~0.75 g / ml, and the effective pass rate is greater than or equal to 97%. At this time, the hydrosilylation reaction begins. Because the reaction is an exothermic reaction, the temperature in the reactor rises sharply. After the temperature stabilizes, control The temperature in the reactor is at 80℃, and stirring...

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Abstract

The invention relates to a solvent-free method for preparing a polyether modified polysiloxane antifoaming agent. The solvent-free method is characterized by comprising the following steps: 1, adding siloxane-oxyalkylene copolymer which is spirally evaporated to remove water to a reaction kettle, then filling nitrogen, and adding an antioxidant BHT (Butylated Hydroxytoluene); 2, adding a platinum catalyst to the reaction kettle, and heating the reaction kettle and stirring, wherein the provided temperature for heating is at 50 to 60 DEG C; 3, adding low-hydro silicone oil and a 4A molecular sieve to the reaction kettle for starting hydrosilylation reaction, and controlling the temperature in the reaction kettle to reach 70 to 110 DEG C, then stirring at constant temperature for 1 to 2 hours; 4, adding hydrochloric acid or sulfuric acid to the reaction system, then stirring to neutralize, and reacting for 1 to 1.5 hours at 85 to 95 DEG C; and 5, spirally evaporating to obtain the reacting product which is the polyether modified polysiloxane after the reaction. The solvent-free method is high in chemical conversion rate; and the prepared polyether modified polysiloxane antifoaming agent is transparent and high in purity, so that the antifoaming performance of the polyether modified polysiloxane antifoaming agent is high.

Description

technical field [0001] The invention relates to the preparation of a water-based ink additive, in particular to a solvent-free method for preparing a polyether-modified polysiloxane defoamer. Background technique [0002] Polyether-modified polysiloxane is a research hotspot at home and abroad in recent years. By selecting polyether with strong antifoaming ability and polysiloxane with strong hydrophobicity and rapid foam breaking as raw materials for reaction, the polysiloxane Polyether-siloxane copolymer (silicon ether for short) prepared by introducing polyether chain into oxane molecule. Polyether-modified polysiloxane is a kind of defoamer, which can be quickly dissolved in water. It can be used alone or in combination with other additives. It has good stability and is also very effective for non-aqueous systems. Polyether-modified polysiloxane defoamer is an ideal new type of silicone defoamer with good development prospects. It can be used as an auxiliary agent for w...

Claims

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Application Information

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IPC IPC(8): C08G81/00C09D11/00B01D19/04
Inventor 蒋平平孙秋波俞晓琴唐敏艳张萍波
Owner KUSN ZHANGPU COLOR PRINTING FACTORY
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