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De-foaming agent and preparation method thereof

A technology of defoaming agent and manufacturing method, which is applied in the field of defoaming agent and its preparation, can solve the problems of defoaming performance decline, shrinkage cavity, phase separation, etc., and achieve the effect of reducing surface tension and good defoaming effect

Inactive Publication Date: 2018-03-06
福建华夏蓝新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the application process, this balance may be destroyed due to slight changes in the system to be defoamed (such as fine-tuning of pH, changes in solute concentration in the system, etc.), resulting in a sharp drop in defoaming performance or shrinkage of the system, phase separation, etc., resulting in Serious consequences

Method used

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  • De-foaming agent and preparation method thereof
  • De-foaming agent and preparation method thereof
  • De-foaming agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of defoamer manufacture method of the present invention is as follows:

[0024] a) Add 1030g of diethylenetriamine and 600g of urea into a 2L autoclave, heat to 150°C and keep for 24 hours. Cool down to below 50°C to obtain cyclic urea compound P1;

[0025] b) Put 290g of 2-propen-1-ol and 1g of catalyst sodium methoxide into a 5L autoclave, heat up to 120°C, and remove water by vacuuming until the weight ratio of water is less than 0.3%; then heat up to 150°C, After adding 580g of propylene oxide, heat it at 150°C for 3 hours; then cool it down to 120°C, add 1540g of ethylene oxide, heat it at 120°C for 2 hours, then cool it to below 60°C; add 462g of epichlorohydrin, and heat up to Heat preservation and aging at 100°C for 4 hours, lower the temperature to below 50°C, add 265g of solid sodium carbonate, stir for 20 minutes, remove the solid by filtration, and obtain allyl alcohol polyether P2;

[0026] c) Add 1000 g of cyclic urea compound P1 into 3300 g of al...

Embodiment 2

[0030] A kind of defoamer manufacture method of the present invention is as follows:

[0031] a) Add 890g of triethylenetetramine and 360g of urea into a 2L autoclave, heat to 180°C and keep for 40 hours. Cool down to below 50°C. Cyclic urea compound Q1 is obtained.

[0032]b) Put 290g of 2-propen-1-ol and 2.7g of catalyst potassium hydroxide into a 5L autoclave, heat up to 120°C, and remove water by vacuuming until the weight ratio of water is less than 0.3%; keep at 120°C , add 2200g of ethylene oxide, heat at 120°C for 3 hours and cool down to below 60°C; add 463g of epichlorohydrin, heat up to 100°C for 4 hours, cool to below 50°C, add 265g of solid sodium carbonate , stirred for 20 minutes, and filtered to remove the solid to obtain allyl alcohol polyether Q2.

[0033] c) Add 618g of cyclic urea compound Q1 into 1660g of allyl alcohol polyether Q2, raise the temperature to 110°C, and react for 3 hours. After the reaction is completed, the water is removed by vacuum or...

Embodiment 3

[0037] A kind of defoamer manufacture method of the present invention is as follows:

[0038] a) Add 1100g of tetraethylenepentamine and 350g of urea into a 1L autoclave, heat to 230°C and keep for 48 hours. Cool down to below 50°C. Obtain cyclic urea compound R1;

[0039] b) Put 58g of 2-propen-1-ol and 0.22g of sodium methoxide into a 2L autoclave, heat up to 120°C, and remove water by vacuuming until the weight ratio of water is less than 0.3%; then heat up to 150°C After adding 464g of propylene oxide, it was incubated at 150°C for 4 hours; then the temperature was lowered to 120°C, 132g of ethylene oxide was added, and it was incubated at 120°C for 1 hour, then cooled to below 60°C; 92.52g of epichlorohydrin was added, Raise the temperature to 100°C and heat-preserve for 4 hours, cool down to below 50°C, add solid sodium carbonate, stir to make the system pH=7-9, and then filter to obtain allyl alcohol polyether R2;

[0040] c) Add 250 g of cyclic urea compound R1 into...

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Abstract

The invention discloses a de-foaming agent and a preparation method thereof. The de-foaming agent is prepared from the following components in parts by weight: 250 to 500 parts of an efficient de-foaming component, 1 to 5 parts of an auxiliary emulsifier, 1 to 5 parts of a thickener, 10 to 30 parts of an anti-freezing agent and 500 to 700 parts of water. The efficient de-foaming component comprises a siloxane structure and a cyclourea structure; and a siloxane group is connected with a cyclourea group through polyether. The de-foaming agent is suitable for de-foaming waterborne polyurethane dispersoid and can be rapidly self-emulsified in the water; the de-foaming agent has extremely excellent compatibility with the waterborne polyurethane dispersoid, has the effect of reducing surface tension of a system and has a very good de-foaming effect on waterborne polyurethane dispersoid foam; and meanwhile, under the synergistic effect of the auxiliary emulsifier, the de-foaming agent can beuniformly distributed on the surface of the waterborne polyurethane dispersoid to damage metastable-state balance of the waterborne polyurethane dispersoid and the aim of inhibiting foam for a long time is realized.

Description

technical field [0001] The invention relates to a defoamer and a preparation method thereof. Background technique [0002] Polyurethane is a polymerization system developed in the 1930s and 1940s. It is known as the resin with the best performance: hard, soft, wear-resistant, chemical corrosion resistant, good electrical insulation, strong adhesion, good plasticity, etc., widely used Used in leather, textile, wood, adhesives, coatings, construction and other fields. With the changes of the times, people's awareness of environmental protection has increased, and water-based polyurethane has emerged as the times require, and has gradually replaced solvent-based polyurethane in various fields. Waterborne polyurethane can be divided into: solution, emulsion, colloidal dispersion and so on according to the dispersion state. Among them, polyurethane dispersion is considered to be the material with the best development prospects, occupying a place in more and more fields. Compar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/46C08G77/452C08J3/03C08L75/04C08L83/12
CPCC08G77/452C08G77/46C08J3/03C08J2375/04C08J2483/12C08L75/04C08L83/12
Inventor 饶长贵陈国栋邱元进
Owner 福建华夏蓝新材料科技有限公司
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