A method for preparing a compound siloxane modified defoamer

Abstract

This invention relates to the field of chemical additives technology, specifically a method for preparing a compound siloxane-modified defoamer. The raw materials include paraffin oil, modified silicone resin polyether microemulsion, octamethylcyclotetrasiloxane, polyether polyol, polyether amine D-400, silane coupling agent KH-560, emulsifier AEO-9, hydrophilic silica, and hydrophobic silica. Through stirring, mixing, and reaction, a modified defoamer with excellent defoaming properties is obtained. This defoamer achieves effective control and elimination of foam through multiple mechanisms, including reducing foam surface tension, penetration and diffusion, disrupting foam structure, enhancing interfacial film strength, and the particle effect. The advantages of this invention lie in its excellent defoaming effect and stability, making it suitable for multiple industries such as chemical, textile, papermaking, and food processing. Furthermore, its environmentally friendly composition meets the environmental requirements of modern industry.

Description

Technical Field

[0001] This invention relates to the field of chemical additives technology, specifically a method for preparing a highly efficient, stable, and non-stratifying compound defoamer modified with siloxane. This defoamer is particularly suitable for various industrial fields such as rubber latex, coatings, and adhesives, in order to solve the problems of poor compatibility, easy stratification, and insufficient defoaming performance of existing defoamers. Background Technology

[0002] Mineral oil-based defoamers are mixtures, with basic components including mineral oil, hydrophobic particles, synergists, and emulsifiers. The hydrophobic particles include silica, fatty acid soaps, and fatty acid amides. Synergists primarily enhance defoaming and foam-suppressing functions by modifying organosilicon components; however, while improving foam control, they can introduce problems such as pinholes, fisheyes, and edge shrinkage. Another drawback of mineral oil products is their tendency to separate; hydrophobic particles settle, and in severe cases, a "cake" phenomenon can occur at the bottom of the packaging container, significantly impacting application effectiveness. Therefore, current technology has not yet solved the common problems of compatibility and defoaming performance balance, as well as the separation issue prevalent in defoamers. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, one of the objectives of this invention is to provide a method for preparing a compound siloxane modified defoamer, which has good defoaming performance, good compatibility, is not prone to stratification, has a simple preparation process, is easy to operate, and the obtained defoamer has good dispersibility, good compatibility and spreading properties.

[0004] The technical solution of the present invention is as follows:

[0005] A method for preparing a compound siloxane-modified defoamer, characterized in that,

[0006] Its raw material quality formula is as follows:

[0007] 60-80 parts of paraffin oil

[0008] Modified silicone polyether microemulsion (FM-550) 15-20 parts

[0009] 4-6 parts of octamethylcyclotetrasiloxane

[0010] 8-12 parts of polyether polyol

[0011] Polyetheramine D-400 10-15 parts

[0012] 1-2 parts of silane coupling agent KH-560

[0013] Emulsifier AEO-9 3-5 parts

[0014] 1-1.5 parts of hydrophilic silica

[0015] 1-1.5 parts of hydrophobic silica

[0016] Its preparation method includes the following steps:

[0017] S1: Add octamethylcyclotetrasiloxane and emulsifier AEO-9 to paraffin oil, stir at 60-80℃ until dispersed, and react at 80-90℃ for 3-4 hours to obtain siloxane modified paraffin oil;

[0018] S2: Add polyether polyol to siloxane-modified paraffin oil and stir and mix evenly at 80-90 ℃;

[0019] S3: Add polyetheramine D-400, modified silicone polyether microemulsion (FM-550), and silane coupling agent KH-560 to the mixture from step S2. Stir and react at 80-90 °C for 1-1.5 hours. Add hydrophilic silica and hydrophobic silica, and continue stirring and reacting for 2-3 hours to obtain the final product.

[0020] A method for preparing a compound siloxane-modified defoamer, characterized in that,

[0021] Its raw material quality formula is as follows:

[0022] 60 parts paraffin oil

[0023] 15 parts of modified silicone polyether microemulsion (FM-550)

[0024] 4 parts of octamethylcyclotetrasiloxane

[0025] 8 parts of polyether polyol

[0026] 10 parts of polyetheramine D-400

[0027] 1 part of silane coupling agent KH-560

[0028] Emulsifier AEO-9 3 parts

[0029] 1 part hydrophilic silica

[0030] One part of hydrophobic silica.

[0031] The method for preparing a compound siloxane-modified defoamer is characterized in that,

[0032] Its raw material quality formula is as follows:

[0033] 80 parts paraffin oil

[0034] 20 parts of modified silicone polyether microemulsion (FM-550)

[0035] 6 parts of octamethylcyclotetrasiloxane

[0036] 12 parts of polyether polyol

[0037] 15 parts of polyetheramine D-400

[0038] 2 parts of silane coupling agent KH-560

[0039] Emulsifier AEO-9 5 parts

[0040] 1.5 parts hydrophilic silica

[0041] 1.5 parts of hydrophobic silica.

[0042] The method for preparing a compound siloxane-modified defoamer is characterized in that,

[0043] Its raw material quality formula is as follows:

[0044] 70 parts paraffin oil

[0045] 18 parts of modified silicone polyether microemulsion (FM-550)

[0046] 5 parts of octamethylcyclotetrasiloxane

[0047] 10 parts of polyether polyol

[0048] Polyetheramine D-400 12 parts

[0049] 1.5 parts of silane coupling agent KH-560

[0050] Emulsifier AEO-9 4 parts

[0051] 1.2 parts hydrophilic silica

[0052] 1.2 parts of hydrophobic silica.

[0053] A method for preparing a compound siloxane-modified defoamer, characterized in that the preparation method includes the following steps:

[0054] S1: Add octamethylcyclotetrasiloxane and emulsifier AEO-9 to paraffin oil, stir at 70-80℃ until dispersed, and react at 85-90℃ for 3 hours to obtain siloxane-modified paraffin oil;

[0055] S2: Add polyether polyol to siloxane-modified paraffin oil and stir and mix evenly at 85-90 ℃;

[0056] S3: Add polyetheramine D-400, modified silicone polyether microemulsion (FM-550), and silane coupling agent KH-560 to the mixture from step S2. Stir and react at 85-90 °C for 1.5 hours. Add hydrophilic silica and hydrophobic silica, and continue stirring and reacting for 2-3 hours to obtain the final product.

[0057] The defoaming mechanism of the compound siloxane modified defoamer of the present invention is mainly based on the following aspects:

[0058] Surface tension decreases:

[0059] The paraffin oil, modified silicone polyether microemulsion (FM-550), and octamethylcyclotetrasiloxane in the defoamer have low surface tension. When these components cover the foam surface, they can significantly reduce the surface tension of the foam, making the foam unstable and thus prone to breakage.

[0060] Infiltration and diffusion:

[0061] The addition of emulsifier AEO-9 helps the defoamer components to disperse and penetrate evenly in the foam system. As an emulsifier, AEO-9 can improve the compatibility between the components, making it easier for the defoamer to penetrate into the foam and disrupt its stability.

[0062] Destroying the foam structure:

[0063] Polyether compounds such as polyether polyols and polyetheramine D-400 have long molecular chains and a certain hydrophilic-lipophilic balance (HLB) value. They can penetrate into the liquid film of foam and disrupt the liquid film structure of foam through intermolecular interactions such as hydrogen bonds and van der Waals forces, causing the foam to lose stability.

[0064] Enhance the strength of the interfacial film:

[0065] The addition of silane coupling agent KH-560 can enhance the interfacial film strength between the defoamer and the foam system to a certain extent. Although this may seem to contradict defoaming, in fact, an appropriate increase in interfacial film strength can prevent the defoamer from being rapidly expelled by the foam, thereby prolonging the defoamer's action time and improving defoaming efficiency.

[0066] Particle effect:

[0067] The addition of both hydrophilic and hydrophobic silica provides a particulate effect to the defoamer. These silica particles can adhere to the foam surface or liquid film, forming a robust thin film that further reduces foam stability. Simultaneously, the presence of these particles increases the rate of foam drainage, accelerating foam breakage.

[0068] In summary, the compound siloxane-modified defoamer of this formulation achieves effective control and elimination of foam through multiple mechanisms, including reducing foam surface tension, penetration and diffusion, disrupting foam structure, enhancing interfacial film strength, and the particle effect. Advantages of this invention:

[0069] The multiple components in this invention work together to rapidly reduce the surface tension of the foam and disrupt its stability, thereby achieving an excellent defoaming effect.

[0070] The addition of polyether polyols and polyether amine D-400, as well as emulsifier AEO-9, in the formulation of this invention helps to improve the stability of the defoamer and prevent it from stratifying or settling during storage and use.

[0071] This invention has excellent defoaming performance and stability, and therefore can be widely used in various occasions that require defoaming, such as chemical, textile, papermaking, and food industries.

[0072] Most of the components of this invention are environmentally friendly materials that will not harm the environment or human health. Furthermore, this defoamer does not produce harmful substances during use, meeting the environmental protection requirements of modern industry. Detailed Implementation

[0073] A method for preparing a compound siloxane-modified defoamer, comprising weighing the following raw materials,

[0074] 600g of paraffin oil

[0075] Modified silicone polyether microemulsion (FM-550) 180g

[0076] 60 grams of octamethylcyclotetrasiloxane

[0077] 100g of polyether polyol

[0078] Polyetheramine D-400 120g

[0079] 2 grams of silane coupling agent KH-560

[0080] Emulsifier AEO-9 5g

[0081] 1.5 grams of hydrophilic silica

[0082] 1.5 grams of hydrophobic silica

[0083] Its preparation method includes the following steps:

[0084] S1: Add octamethylcyclotetrasiloxane and emulsifier AEO-9 to paraffin oil, stir until dispersed at 60-80℃, and then react at 80-90℃ for 3-4 hours to obtain modified paraffin oil; D4 is a low-viscosity siloxane with good fluidity and lubricity. D4 molecules change the viscosity and fluidity of paraffin oil by interacting with paraffin oil molecules.

[0085] S2: Add polyether polyol to modified paraffin oil and stir and mix evenly at 80-90 ℃;

[0086] S3: Add modified silicone polyether microemulsion (FM-550), polyether amine D-400, and silane coupling agent KH-560 to the mixture in step S2. Stir and react at 80-90 °C for 1-1.5 hours. Add hydrophilic silica and hydrophobic silica, and continue stirring and reacting for 2-3 hours to obtain the defoamer of the present invention.

[0087] FM-550, as a polymer containing both silicon-oxygen and ether bonds, may act as a compatibilizer, dispersant, and stabilizer in the system. Polyetheramine D-400 contains amino groups (−...). NH 2) and ether bond (− O -), undergoes amination reactions with the epoxy or silyl groups in the silane coupling agent KH-560. The surface properties of the products are adjusted by the addition of silica. Hydrophilic silica surfaces are rich in hydroxyl groups, readily interacting with water or other polar solvents; while hydrophobic silica undergoes surface treatment to reduce the number of hydroxyl groups, increasing its compatibility with organic matter. Silica particles may combine with other components in the system through the bridging effect of the silane coupling agent KH-560, which is beneficial for forming stable complexes.

[0088] The samples produced by this invention were tested:

[0089] Weigh a certain amount of the defoamer of this invention and put it into styrene-butadiene latex. The amount of defoamer added is 0.2% to 0.6% of the styrene-butadiene latex. After maintaining the temperature at 60-80°C for 10 minutes, shake it up and down rapidly 20-30 times using a defoaming test rack, observe the defoaming and record the defoaming time.

[0090] result:

[0091] The average defoaming time is 15 seconds, which is faster and more water-soluble than common defoamers on the market.

[0092] The table below shows the defoaming performance test results of the samples from this invention.

[0093] Test Project The defoaming agent of this invention DAL604 Defoamer Defoaming time S 15 46 Defoaming time (min) 38 23 Water dispersibility excellent excellent Centrifugal stability 2000 rpm Unlayered Unlayered Remaining bubbles none none .

Claims

1. A method for preparing a compound siloxane-modified defoamer, characterized in that, Its raw material quality formula is as follows: 60-80 parts of paraffin oil Modified silicone polyether microemulsion (FM-550) 15-20 parts 4-6 parts of octamethylcyclotetrasiloxane 8-12 parts of polyether polyol Polyetheramine D-400 10-15 parts 1-2 parts of silane coupling agent KH-560 Emulsifier AEO-9 3-5 parts 1-1.5 parts of hydrophilic silica 1-1.5 parts of hydrophobic silica Its preparation method includes the following steps: S1: Add octamethylcyclotetrasiloxane and emulsifier AEO-9 to paraffin oil, stir at 60-80℃ until dispersed, and react at 80-90℃ for 3-4 hours to obtain siloxane modified paraffin oil; S2: Add polyether polyol to siloxane-modified paraffin oil and stir and mix evenly at 80-90 ℃; S3: Add polyetheramine D-400, modified silicone polyether microemulsion (FM-550), and silane coupling agent KH-560 to the mixture from step S2. Stir and react at 80-90 °C for 1-1.5 hours. Add hydrophilic silica and hydrophobic silica, and continue stirring and reacting for 2-3 hours to obtain the final product.

2. The preparation method of a compound siloxane-modified defoamer according to claim 1, characterized in that, Its raw material quality formula is as follows: 60 parts paraffin oil 15 parts of modified silicone polyether microemulsion (FM-550) 4 parts of octamethylcyclotetrasiloxane 8 parts of polyether polyol 10 parts of polyetheramine D-400 1 part of silane coupling agent KH-560 Emulsifier AEO-9 3 parts 1 part hydrophilic silica One part of hydrophobic silica.

3. The preparation method of a compound siloxane-modified defoamer according to claim 1, characterized in that, Its raw material quality formula is as follows: 80 parts paraffin oil 20 parts of modified silicone polyether microemulsion (FM-550) 6 parts of octamethylcyclotetrasiloxane 12 parts of polyether polyol 15 parts of polyetheramine D-400 2 parts of silane coupling agent KH-560 Emulsifier AEO-9 5 parts 1.5 parts hydrophilic silica 1.5 parts of hydrophobic silica.

4. The preparation method of a compound siloxane-modified defoamer according to claim 1, characterized in that, Its raw material quality formula is as follows: 70 parts paraffin oil 18 parts of modified silicone polyether microemulsion (FM-550) 5 parts of octamethylcyclotetrasiloxane 10 parts of polyether polyol Polyetheramine D-400 12 parts 1.5 parts of silane coupling agent KH-560 Emulsifier AEO-9 4 parts 1.2 parts hydrophilic silica 1.2 parts of hydrophobic silica.

5. The preparation method of a compound siloxane-modified defoamer according to claim 1, characterized in that, The preparation method includes the following steps: S1: Add octamethylcyclotetrasiloxane and emulsifier AEO-9 to paraffin oil, stir at 70-80℃ until dispersed, and react at 85-90℃ for 3 hours to obtain siloxane-modified paraffin oil; S2: Add polyether polyol to siloxane-modified paraffin oil and stir and mix evenly at 85-90 ℃; S3: Add polyetheramine D-400, modified silicone polyether microemulsion (FM-550), and silane coupling agent KH-560 to the mixture from step S2. Stir and react at 85-90 °C for 1.5 hours. Add hydrophilic silica and hydrophobic silica, and continue stirring and reacting for 2-3 hours to obtain the final product.