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Problems solved by technology
[0005] The solid defoamers in the above patents mostly use the choice of carrier or the combination of silicone grease and other additives to achieve the balance of defoaming and foam suppression, and silicone grease that has not been pre-emulsified and dispersed is difficult to form in the carrier. Evenly distributed, so the foam control effect in the early washing and later washing is not ideal, and it is difficult to ensure the defoaming stability of the product
Method used
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preparation example Construction
[0039] (1) Preparation of silicone emulsion S1:
[0040] At room temperature, add 20 parts of G1, 1.5 parts of Pingpingjia O-25, 0.5 parts of sorbitan monooleate, 3 parts of silicon polyether E 2 , 3 parts of silicon polyether E 1 Raise the temperature to 70°C while stirring, fully emulsify and mix for 35 minutes; after completion, keep the temperature of the system at 70°C and slowly add water, increase the stirring speed to change the phase from water-in-oil emulsion to oil-in-water emulsion, and continue to add water To the required mass concentration, it is 50%. The above mixture is further emulsified by a colloid mill to obtain the desired silicone emulsion S1.
[0041] (2) Preparation of silicone emulsion S2:
[0042] At room temperature, add 30 parts of G2, 4.5 parts of Pingpingjia O-15, 3 parts of sorbitan monooleate, 2.5 parts of silicon polyether E 1 , 4 parts of silicon polyether E 3 , raise the temperature to 80°C while stirring, and mix thoroughly at 80°C for...
Embodiment 1
[0051] Add 70g of starch into the mixer, add 12.5g of silicone emulsion S2 into it, and stir evenly; add 5g of starch into it, stir evenly, then add 2.5g of silicone emulsion S4, and stir evenly. Then add 2g sodium carboxymethylcellulose and 3g polyacrylic acid, continue to stir, add 5g of absolute ethanol after stirring evenly, granulate and dry the mixture obtained after stirring evenly, and obtain the prepared granular defoamer Example 1 .
Embodiment 2
[0053] Add 60g of sodium sulfate (800 mesh) into the mixer, add 16.5g of silicone emulsion S2 to it, and stir evenly; then add 9g of sodium sulfate (800 mesh), stir evenly, and then add 3.5g of silicone emulsion S5, Stir well. Then add 2g of sodium citrate and 3g of maleic acid acrylic acid copolymer, continue to stir, add 3g of absolute ethanol and 3g of deionized water after stirring evenly, granulate and dry the obtained mixture after stirring evenly, and obtain the prepared granules Defoamer Example 2.
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Abstract
The invention provides a preparation method of particle defoaming agent characterized in that organic silicon emulsion is used to substitute silicone grease and agglomerated on carrier by substeps to form two silicone grease layers to overcome overlarge concentration gradient and non-uniform distribution of active matter generated by one-step agglomeration, thus the external and internal of the defoaming agent particle both have sufficient defoaming components to act a slow-release function in order to improve the defoaming, foaming inhibition and stable performance of the product. The solid particle defoaming agent prepared has excellent defoaming and foaming inhibition effects in the cleaning of various heat exchange devices, boilers, heat exchange pipes and in the cleaning process of steal plate, machinery, cement, starch pasting and washing powder.
Description
technical field [0001] The invention relates to a method for preparing a granular defoamer. The defoamer belongs to the additive of fine chemicals, therefore, the present invention belongs to the technical field of fine chemicals. technical background [0002] In industrial cleaning, industrial cleaning agents are needed to remove dirt and reduce the surface tension between oil and water. The cleaning agent contains a large amount of surfactant. During the agitation process, the surfactant will be adsorbed around the bubbles to stabilize the bubbles, thereby generating a large amount of foam. This situation is more prominent in beer bottle cleaning, cleaning of various heat exchange equipment, boilers, heat exchange pipes, steel plate cleaning, mechanical cleaning, cement, starch gelatinization and other industrial processes. The existence of foam will reduce production capacity, cause waste of raw materials and products, prolong the reaction cycle, affect product quality,...
Claims
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