Starch-based composite polyether defoamer and preparation method thereof

Abstract

The present application provides a kind of starch-based composite polyether defoamer and its preparation method, which is mixed by defoaming component and adsorbing powder according to the mass ratio of 100:0.1-0.8, the defoaming component is polymerized by porous potato starch particles, isocyanate monomer, organic silicon polyether monomer and organic silicon polyester monomer according to the molar ratio of 2:3:0.05-0.37:1, the defoaming component is degradable superabsorbent tree molecule polymer, the low surface energy of organic silicon polyether in defoaming component plays a role in breaking and suppressing bubbles formed by paddle stirring gas, at the same time, the organic silicon polyester in defoaming component has alkaline hydrolysis effect, which can play a slow-release role of defoaming material, and improve the duration of defoaming.

Description

A starch-based composite polyether defoamer and its preparation method Technical Field

[0001] This invention provides a starch-based composite polyether defoamer, belonging to the field of chemical additives technology. Background Technology

[0002] Foam is a stable dispersion of air in a liquid medium. Generally, pure liquids do not form stable foams. When agitated, air bubbles formed in a pure liquid have a lower density than the liquid itself. These bubbles gradually move towards the surface, burst upon reaching it, and eventually disappear. Stable foams can only form when surface-active substances are mixed into the liquid. The addition of surface-active substances increases the elastic modulus of the bubble film, thus achieving a stable structure.

[0003] Currently, the main methods for eliminating foam in liquid systems are physical defoaming and chemical defoaming. Commonly used physical defoaming methods include thermodynamic methods, ultrasonic methods, electrostatic methods, vacuum methods, and mechanical methods. These methods primarily utilize mechanical equipment to apply physical force to the foam, causing it to lose stability and break down, thus achieving defoaming. Their disadvantages include reliance on mechanical equipment, the ability to eliminate only a small number of bubbles, and relatively low defoaming efficiency. Chemical defoaming involves adding chemical reagents to the foam base liquid to alter certain properties of the foaming agent, thereby achieving defoaming. The reagents used are called defoamers. The advantages of chemical defoaming are simple application and high defoaming efficiency.

[0004] Defoamers are classified according to their composition into mineral oil-based, silicone-based, polyether-based, and silicone-ether mixed types. Mineral oil-based defoamers have been largely replaced due to their poor dispersibility in water. Silicone-based defoamers, generally including products like polydimethylsiloxane, are characterized by rapid defoaming and good foam suppression, but their high price and insolubility in water limit their widespread application. Polyether-based defoamers, on the other hand, are non-toxic, have excellent defoaming effects, good thermal stability, are non-irritating, and disperse well in water, making them widely used in industry, food, and cosmetics. A common problem with existing defoamers is their short shelf life, failing to achieve long-term foam suppression. Summary of the Invention

[0005] This invention addresses the shortcomings of the prior art by providing a starch-based composite polyether defoamer and its preparation method. This defoamer, while efficiently breaking up foam, also provides a sustained-release effect, giving it long-lasting defoaming and foam-suppressing properties.

[0006] The technical solution adopted to achieve the above-mentioned objectives of this invention is as follows:

[0007] A starch-based composite polyether defoamer is composed of a defoaming component and an adsorbent powder mixed at a mass ratio of 100:0.1~0.8. The defoaming component is polymerized from porous potato starch granules, isocyanate monomers, organosilicon polyether monomers, and organosilicon polyester monomers at a molar ratio of 2:3:0.05~0.37:1. The defoaming component is a biodegradable, highly absorbent dendritic polymer. The low surface energy of the organosilicon polyether in the defoaming component plays a role in breaking and suppressing bubbles in the gas generated by the agitation of the paddle. At the same time, the organosilicon polyester in the defoaming component has an alkaline hydrolysis effect, which can play a role in the slow release of the defoaming material and improve the duration of defoaming.

[0008] Furthermore, the adsorbent powder is medical-grade calcium alginate powder with a purity of over 97% and a particle size of less than 1 μm.

[0009] Furthermore, the porous potato starch granules have a specific surface area of ​​20-150 m². 2 / g of porous potato starch granules.

[0010] Furthermore, the organosilicon polyether monomer is an organosilicon polyether monomer with a molecular weight of less than 4000 and a ratio of organosilicon segments to polyether segments between 1:2 and 1:5.

[0011] Furthermore, the organosilicon polyester monomer is an organosilicon polyester monomer with a molecular weight of less than 4000 and a ratio of organosilicon segments to polyester segments between 1:2 and 1:5.

[0012] Furthermore, the isocyanate monomer is one of isophorone diisocyanate (IPDI) and diphenylmethane diisocyanate (MDI), or a mixture of the two in any proportion.

[0013] This invention also provides a method for preparing the above-mentioned starch-based composite polyether defoamer, the steps of which are as follows: acetone, porous potato starch granules, and isocyanate monomers are poured into a stainless steel reactor and stirred thoroughly for more than 30 minutes. The temperature is then raised to 60 degrees Celsius and maintained for 30 to 400 minutes. After that, the temperature is raised to 75 to 80 degrees Celsius. The organosilicon polyether monomer and organosilicon polyester monomer weighed in proportion are then quickly added to the reactor, and the internal air is replaced with high-purity nitrogen and maintained for 3 minutes. After completion, the reaction is maintained for 120 to 240 minutes. After that time, excess sodium hydroxide is added and purified water is added to fully dissolve the mixture. The pH value is then adjusted to 7 to 8. Adsorption powder is then added and mixed in a double cone for 30 to 60 minutes to obtain the starch-based composite polyether defoamer.

[0014] Compared with the prior art, the starch-based composite polyether defoamer provided by the present invention has the following advantages: the defoaming component in this application is a biodegradable, highly absorbent dendritic molecular polymer. The low surface energy of the organosilicon polyether in the defoaming component plays a role in breaking and suppressing the gas formed by the stirring of the paddle. At the same time, the organosilicon polyester in the defoaming component has an alkaline hydrolysis effect, which can play a role in the slow release of the defoaming material and improve the duration of defoaming. Detailed Implementation

[0015] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to embodiments. Embodiment 1

[0016] The adsorbable calcium alginate powder used in this embodiment is calcium alginate powder with a purity of 97% and a particle size of 500nm.

[0017] The absorbable dendritic polymer powder used is a defoaming structure synthesized from porous potato starch granules, isocyanate monomers, organosilicon polyether monomers, and organosilicon polyester monomers in a molar ratio of 2:3:0.05:1.

[0018] The porous potato starch granules used have a specific surface area of ​​150 m². 2 / g of porous potato starch granules;

[0019] The silicone polyether monomer used is a silicone polyether monomer with a molecular weight of 200 and a silicone segment to polyether segment ratio of 1:2.

[0020] The silicone polyester monomer used is a silicone polyester monomer with a molecular weight of 4000 and a ratio of silicone segments to polyester segments of 1:2.

[0021] The isocyanate monomers used are a mixture of IPDI (isophorone diisocyanate) and MDI (diphenylmethane diisocyanate) in a mass ratio of 1:1.

[0022] The preparation method of the starch-based composite polyether defoamer in this embodiment is as follows: Acetone, porous potato starch granules, and isocyanate monomers are poured into a stainless steel reactor and stirred thoroughly for more than 30 minutes. The temperature is then raised to 60°C and maintained for 240 minutes. After that, the temperature is raised to 75°C, and the required organosilicon polyether monomers and organosilicon polyester monomers are quickly added to the reactor. The internal air is replaced with high-purity nitrogen and maintained for 3 minutes. After completion, the reaction is maintained for 240 minutes. Excess sodium hydroxide is added, and medical-grade purified water is added to fully dissolve the mixture. The pH value is adjusted to 7 with hydrochloric acid, and then calcium alginate powder is added and mixed in a biconical reactor for 60 minutes to obtain the starch-based composite polyether defoamer.

[0023] The properties of the starch-based composite polyether defoamer obtained in this embodiment are shown in Table 1:

[0024] Table 1

[0025] Example 2

[0026] The adsorbable calcium alginate powder used in this embodiment is calcium alginate powder with a purity of 97% and a particle size of 800nm.

[0027] The absorbable dendritic polymer powder used is a biodegradable, highly absorbent dendritic molecule synthesized from porous potato starch granules, isocyanate monomers, organosilicon polyether monomers, and organosilicon polyester monomers in a molar ratio of 2:3:0.37:1.

[0028] The porous potato starch granules used have a specific surface area of ​​20 m². 2 / g of medical-grade porous potato starch granules;

[0029] The organosilicon polyether monomer used is an organosilicon polyether monomer with a molecular weight of 4000 and a ratio of organosilicon segments to polyether segments of 1:5.

[0030] The silicone polyester monomer used is a silicone polyester monomer with a molecular weight of 1350 and a silicone segment to polyester segment ratio of 1:2.

[0031] The isocyanate monomer used is IPDI (isophorone diisocyanate).

[0032] The preparation method of the starch-based composite polyether defoamer in this embodiment is as follows: Acetone, porous potato starch granules, and isocyanate monomers are poured into a stainless steel reactor and stirred thoroughly for more than 10 minutes. The temperature is raised to 60°C and maintained for 30 minutes, then raised to 80°C. The required organosilicon polyether monomers and organosilicon polyester monomers are quickly added to the reactor, and the internal air is replaced with high-purity nitrogen and maintained for 3 minutes. After completion, the reaction is maintained for 30 minutes. Excess sodium hydroxide is added, and medical-grade purified water is added to fully dissolve it. The pH value is adjusted to 8 with hydrochloric acid, and then calcium alginate powder is added and mixed in a biconical reactor for 30 minutes to obtain the starch-based composite polyether defoamer.

[0033] The properties of the starch-based composite polyether defoamer obtained in this embodiment are shown in Table 2:

[0034] Table 2

[0035] Example 3

[0036] The adsorbable calcium alginate powder used in this embodiment is calcium alginate powder with a purity of 97% and a particle size of 800nm.

[0037] The absorbable dendritic polymer powder used is a defoaming structure synthesized from porous potato starch granules, isocyanate monomers, organosilicon polyether monomers, and organosilicon polyester monomers in a molar ratio of 2:3:0.2:1.

[0038] The porous potato starch granules used have a specific surface area of ​​110 m². 2 / g of medical-grade porous potato starch granules;

[0039] The organosilicon polyether monomer used is an organosilicon polyether monomer with a molecular weight of 3530 and a ratio of organosilicon segments to polyether segments of 1:3.

[0040] The silicone polyester monomer used is a silicone polyester monomer with a molecular weight of 230 and a silicone segment to polyester segment ratio of 1:3.

[0041] The isocyanate monomer used is MDI (diphenylmethane diisocyanate).

[0042] The preparation method of the starch-based composite polyether defoamer in this embodiment is as follows: Acetone, porous potato starch granules, and isocyanate monomers are poured into a stainless steel reactor and stirred thoroughly for more than 10 minutes. The temperature is then raised to 70°C and maintained for 120 minutes, followed by raising the temperature to 78°C. The required organosilicon polyether monomers and organosilicon polyester monomers are quickly added to the reactor, and the internal air is replaced with high-purity nitrogen and maintained for 3 minutes. After completion, the reaction is maintained for 30 minutes. Excess sodium hydroxide is added, and medical-grade purified water is added to fully dissolve the mixture. The pH value is adjusted to 8 with hydrochloric acid, and then calcium alginate powder is added and mixed in a biconical reactor for 30 minutes to obtain the starch-based composite polyether defoamer.

[0043] The properties of the starch-based composite polyether defoamer obtained in this embodiment are shown in Table 3:

[0044] Table 3

[0045] .

Claims

1. A starch-based composite polyether defoamer, characterized in that: The product is composed of a mixture of defoaming component and adsorbent powder at a mass ratio of 100:0.1~0.

8. The defoaming component is polymerized from porous potato starch granules, isocyanate monomer, organosilicon polyether monomer and organosilicon polyester monomer at a molar ratio of 2:3:0.05~0.37:

1. The defoaming component is a biodegradable, highly absorbent dendritic polymer. The low surface energy of the organosilicon polyether in the defoaming component plays a role in breaking and suppressing bubbles in the gas generated by stirring the slurry. At the same time, the organosilicon polyester in the defoaming component has an alkaline hydrolysis effect, which can play a role in the slow release of defoaming material and improve the duration of defoaming. The organosilicon polyether monomer is an organosilicon polyether monomer with a molecular weight of less than 4000 and a ratio of organosilicon segments to polyether segments between 1:2 and 1:5; the organosilicon polyester monomer is an organosilicon polyester monomer with a molecular weight of less than 4000 and a ratio of organosilicon segments to polyester segments between 1:2 and 1:

5.

2. The starch-based composite polyether defoamer according to claim 1, characterized in that: The adsorbent powder is medical-grade calcium alginate powder with a purity of over 97% and a particle size of less than 1 μm.

3. The starch-based composite polyether defoamer according to claim 1, characterized in that: The porous potato starch granules have a specific surface area of ​​20-150 m². 2 / g of porous potato starch granules.

4. The starch-based composite polyether defoamer according to claim 1, characterized in that: The isocyanate monomer is one of isophorone diisocyanate (IPDI) and diphenylmethane diisocyanate (MDI), or a mixture of the two in any proportion.

5. The preparation method of the starch-based composite polyether defoamer according to claim 1, characterized in that: Acetone, porous potato starch granules, and isocyanate monomers are poured into a stainless steel reactor and stirred thoroughly for at least 30 minutes. The temperature is then raised to 60 degrees Celsius and maintained for 30 to 400 minutes. After that, the temperature is raised to 75 to 80 degrees Celsius. The organosilicon polyether monomer and organosilicon polyester monomer, weighed in proportion, are then quickly added to the stainless steel reactor. The internal air is replaced with high-purity nitrogen and maintained for 3 minutes. After the reaction is completed, the reaction is maintained for 120 to 240 minutes. After that, excess sodium hydroxide and purified water are added to dissolve the mixture completely. The pH value is then adjusted to 7 to 8. Finally, the adsorption powder is added and mixed in a biconical reactor for 30 to 60 minutes to obtain the starch-based composite polyether defoamer.

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