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Low-foam dispersant, preparation method and application thereof

A dispersant and initiator technology, which is applied in the synthesis of polymer compounds and low-foaming dispersants. It can solve the problems of uneven spray liquid, easy overflow of liquid medicine, and poor foam suppression ability, so as to achieve less foam and less foam. The effect of strong lipophilicity and low surface tension

Active Publication Date: 2017-06-23
祥瑞博特生物科技(北京)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation generally has a high foam during the preparation process or after entering water. This is because the dispersant and wetting agent are surfactants that are easy to foam, and the foam brings a lot of inconvenience to processing and use.
For example, the material of the suspending agent is prone to foam during the sanding process, which has caused a lot of trouble to the production. The current practice is to add defoamers such as silicone during production. The foaming agent has good defoaming ability but poor foaming suppression ability, and the defoaming agent must be added from time to time during the process; the preparation needs to be stirred and dispersed during use, and foam is also prone to be generated during the stirring process, causing the liquid to overflow the container during preparation , The spray liquid is uneven, and the low-foam dispersant can solve the above problems very well

Method used

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  • Low-foam dispersant, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of Monomer A:

[0036] In a four-neck flask with 100g of toluene, add 61.8g of polyether-modified silicone oil (m is 4, n is 15, molecular weight is 1236) and 5.90g of maleic anhydride, after all dissolved, stir the reaction at 40°C After 5h, the heating was stopped, toluene and residual maleic anhydride were removed, the temperature was lowered and the material was discharged to obtain a liquid product, monomer A.

[0037] The preparation method of low foam dispersant:

[0038] (1) In the reactor, add 30g of monomer A prepared above, 20.6g of monomer B (sodium styrene sulfonate), 1g of sodium lauryl sulfate, 80g of water, stir and heat to 70°C;

[0039] (2) Add 9.68g monomer C (methyl acrylate) and initiator aqueous solution (a mixture of 0.3g ammonium persulfate and 15g water) dropwise into the reactor at the same time, and the dropping time is 2h;

[0040] (3) After reacting for 3 hours, cool down to normal temperature, adjust the pH to 5.0 with 30% sod...

Embodiment 2

[0042] Preparation of Monomer A:

[0043] In a four-neck flask with 100g of toluene, add 67.04g of polyether-modified silicone oil (m is 10, n is 53, molecular weight is 3352) and 2.36g of maleic anhydride, after they are all dissolved, stir the reaction at 45°C After 7h, the heating was stopped, toluene and residual maleic anhydride were removed, the temperature was lowered and the material was discharged to obtain a liquid product, monomer A.

[0044] The preparation method of low foam dispersant:

[0045] (1) In the reactor, add 30g of monomer A prepared above, 13.76g of monomer B (sodium methacrylate), 0.7g of sodium dodecyl sulfate, and 90g of water, stir and heat to 80°C;

[0046] (2) Add 7.49g of monomer C (styrene) and initiator aqueous solution (a mixture of 1.58g of sodium persulfate and 15g of water) dropwise into the reactor at the same time, and the dropping time is 2.5h;

[0047] (3) After reacting for 5 hours, cool down to normal temperature, adjust the pH to ...

Embodiment 3

[0049] Preparation of Monomer A:

[0050] In a four-neck flask with 100g of toluene, add 72.40g of polyether modified silicone oil (m is 7, n is 23, molecular weight is 1810) and 4.71g of maleic anhydride, after all dissolved, stir the reaction at 35°C After 9h, the heating was stopped, toluene and residual maleic anhydride were removed, the temperature was lowered and the material was discharged to obtain a liquid product, monomer A.

[0051] The preparation method of low foam dispersant:

[0052] (1) In the reactor, add 30g of monomer A prepared above, 13.03g of monomer B (2-acrylamide-2-methylpropanesulfonic acid), 1.2g of sodium lauryl sulfate, 90g of water, and stir Heating to 85°C;

[0053] (2) Add 24.94g monomer C (isooctyl methacrylate) and initiator aqueous solution (a mixture of 1.02g sodium persulfate and 15g water) dropwise into the reactor at the same time, and the dropping time is 3h;

[0054] (3) After reacting for 6 hours, cool down to normal temperature, ad...

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Abstract

The invention discloses a low-foam dispersant, a preparation method and an application thereof and belongs to the technical field of high-molecular compound synthesis. The dispersant is a polymer, the weight-average molecular weight of which is 5000-35000, copolymerized by monomers A, B and C, wherein the monomer A is polyether-modified silicone oil maleate. The preparation method comprises the following steps: (1) adding the monomers A and B, lauryl sodium sulfate and water, and stirring and heating the mixture; (2) dropwise adding the monomer C and an initiator; and (3) after reaction, reducing the temperature and adjusting the pH to 4-8. The low-foam dispersant disclosed by the invention can reduce foam of a system, and is convenient to produce and use; the low-foam dispersant can reduce the surface tension of a water system, so that the system has relatively low surface tension, and is good in wetting property; the dispersibility is improved, and the system is more stable; the dispersant is uniformly dispersed; and the low-foam dispersant can be applied to preparations such as pesticide wettable powder, a suspending agent and water dispersible granules.

Description

technical field [0001] The invention relates to the technical field of polymer compound synthesis, in particular to the technical field of synthesis of a low-foaming dispersant. Background technique [0002] A dispersant is a surfactant that has two opposite properties of lipophilicity and hydrophilicity in the molecule. It can uniformly disperse the solid and liquid particles of inorganic and organic pigments that are difficult to dissolve in liquid, and at the same time prevent the particles from settling and agglomerating to form a stable suspension. [0003] The formulations of pesticide formulations such as wettable powders, water-dispersible granules, and suspension concentrates generally contain dispersants and wetting agents. The formulation generally has a high foam during the preparation process or after entering water, because the dispersant and the wetting agent are surfactants that are easy to foam, and the foam brings a lot of inconvenience to processing and u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/04A01N25/14A01N25/12A01N25/30C08F290/06C08F212/14C08F228/02C08F220/18C08F220/14C08F212/08C08F220/58C08F218/08
CPCA01N25/04A01N25/12A01N25/14A01N25/30C08F290/068C08F220/1808C08F212/14
Inventor 李汉承
Owner 祥瑞博特生物科技(北京)有限责任公司
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