Defoaming agent and synthesis method thereof

A synthesis method and defoamer technology, applied in defoamers, paper, textiles and papermaking, etc., can solve problems affecting the compatibility of defoamers and coatings, unstable quality of defoamers, and affecting the stability of coatings, etc. , to achieve clear and controllable structure, good defoaming effect, stable quality and performance

Active Publication Date: 2017-08-11
威尔(福建)生物有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing defoamers for paper-making coatings are often compounded with other defoamers on the market. The components are complex and the raw materials interact with each other, resulting in unstable quality of the compounded defoamer and affecting the relationship between the defoamer and the paint. Compatibility, affects the stability of the coating, and ultimately leads to a decline in the quality of the paper

Method used

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  • Defoaming agent and synthesis method thereof
  • Defoaming agent and synthesis method thereof
  • Defoaming agent and synthesis method thereof

Examples

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preparation example Construction

[0026] The present invention also provides a kind of synthetic method of defoamer, comprising the following steps:

[0027] Step 1: Add the starter unsaturated fatty alcohol into the reaction kettle, add the catalyst potassium hydroxide at the same time, start stirring, raise the temperature to 100-120°C, and remove water by vacuum or molecular sieve adsorption and dehydration until the weight ratio of water is less than 0.3%, then heat up to 130-150°C, add ethylene oxide, after adding, heat-preserve at 135-165°C for 25-40min, then add propylene oxide, after the reaction is completed, heat-preserve at 140-170°C for 30-45min ; Cool down to 130-150°C, add ethylene oxide, and heat-preserve at 135-165°C for 25-40 minutes to obtain the first unsaturated enol polyether;

[0028] Step 2: Add the starter unsaturated fatty alcohol into the reaction kettle, and at the same time add the catalyst potassium hydroxide, start stirring, raise the temperature to 80-120°C, and remove water by v...

Embodiment 1

[0048] 1. Add 10mol of the starter 2-propen-1-ol into the reaction kettle, add 10g of potassium hydroxide catalyst at the same time, start stirring, raise the temperature to about 120°C and vacuumize to about 0.01Mpa, remove the water until the weight ratio of the water is less than 0.1%, then raise the temperature to 140°C, slowly add 30mol ethylene oxide in batches (about 10mol per batch, weight about 440g), heat and mature for 30min after the addition, then raise the temperature to 160°C, add in batches (add each batch About 10mol, weight about 580g) 170mol propylene oxide, after the reaction is completed, heat and mature at 160±5°C for 30min, then slowly add 20mol ethylene oxide in batches (about 10mol, weight about 440g) again, after the addition is completed, Heat preservation at 150±5°C for 40 minutes, cool down to below 80°C and adjust pH to 6-7 with phosphoric acid to obtain acryl alcohol block polyether.

[0049] 2. Add 10mol of the starter 9-octadecen-1-ol to the re...

Embodiment 2

[0063] 1. Add 10mol of the starter 9-octadecen-1-ol into the reaction kettle, add 10g of potassium hydroxide catalyst at the same time, start stirring, raise the temperature to about 120°C and vacuumize to about 0.01Mpa, remove the water to the weight of the water Ratio is less than 0.1%, then heat up to 140°C, slowly add 30mol of ethylene oxide in batches (about 10mol per batch, weight about 440g), add 30mol of ethylene oxide after the addition is complete, heat preservation and aging for 30min, then raise the temperature to 160°C, slowly add in batches ( Add about 10mol, weight about 580g) and 170mol propylene oxide in each batch. After the reaction is completed, heat preservation and aging at 160±5°C for 30 minutes, then cool down to 140°C, and slowly add in batches (about 10mol in each batch, about 440g) 30mol ethylene oxide alkanes, after the addition is complete, heat-preserve at 140±5°C for 40 minutes, cool down to below 85°C and adjust the pH to 6-7 with phosphoric acid...

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Abstract

The invention provides a defoaming agent and a synthesis method thereof. The defoaming agent comprises special polyether which comprises first unsaturated enol polyether, second unsaturated enol polyether and unsaturated gemini quaternary ammonium salt. By different combination of EO and PO in gemini polyether and change of the ratio of the unsaturated polyether and unsaturated gemini quaternary ammonium salt, the special polyether which is the main ingredient of the defoaming agent can rapidly permeate into coating, the ratio of EO to PO of block polyether is adjusted to adjust the hydrophile-lyophile ratio of the special polyether, and the defoaming agent is synthesized by a positive and negative charge attracting principle. The defoaming agent has the characteristics that the defoaming effect is good, compatibility of the defoaming agent and the coating is good, and the applicability is wide. Compared with a compound defoaming agent which is compounded by other defoaming agents in markets, the provided defoaming agent is simple in components; the structure is clear and controllable; and the quality and the property are stable.

Description

technical field [0001] The invention relates to a papermaking auxiliary agent, in particular to a defoamer and a synthesis method thereof. Background technique [0002] In the paper industry, fillers are often prepared as coatings with water as the medium. When the coating is prepared, it is necessary to disperse the components with strong stirring. The prepared coating is usually coated on the surface of the fiber by tools such as an air knife. During the coating preparation and coating process, a large amount of foam is easily generated due to the high shearing effect generated by the high-speed operation of the paper machine. The existence of foam will easily cause paper problems such as uneven coating, decreased hiding power, and quantitative changes in paper, which will seriously reduce the quality of paper. Therefore, defoamers are often used in industry to defoam and suppress foam in coatings. Existing defoamers for paper-making coatings are often compounded with o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/12D21H17/53C08F283/06C08F220/34
CPCC08F283/065D21H17/53D21H21/12C08F220/34
Inventor 齐文刚黄继富曾祥庚邱元进许荣根倪素美
Owner 威尔(福建)生物有限公司
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