High-molecular-weight polyether defoamer and preparation method thereof
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A polyether defoamer and high molecular weight technology, applied in the field of high molecular weight polyether defoamer for metal spray cleaning and its preparation, can solve the problem of poor defoaming and foam suppression, high initial foam, low molecular weight, etc. question
Inactive Publication Date: 2017-12-26
SHENYANG HAOBO IND CO LTD
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Problems solved by technology
At present, domestic polyether defoamers mainly use linear alcohols or amines as initiators, and propylene oxide or block polymers with linear structures of ethylene oxide and propylene oxide in different proportions. Generally low, mainly concentrated in 500-3000, so, in the process of metal spray cleaning, there are problems of high initial foam, poor defoaming and foam suppression
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Embodiment 1
[0027] A high molecular weight polyether defoamer, the molecular structure is initiator + BO + EO + PO, including the following components in parts by mass: 0.07 parts of potassium hydroxide (catalyst); 10 parts of trimethylol propane , EO: PO: 1000 parts of BO (epoxide), 3 parts of isooctanoic acid, 1 part of hydrogen peroxide; the addition amount of ethylene oxide (EO), propylene oxide (PO), and butylene oxide (BO) is EO :PO:BO=10:10:1 (molar ratio).
[0028] Prepare as follows: comprise the steps:
[0029] 1. Put trimethylolpropane and potassium hydroxide into the autoclave, seal the autoclave, evacuate and replace with nitrogen for 3 times, and then evacuate until the negative pressure is -0.08MPa;
[0030] 2. Raise the temperature in the kettle to 80°C, dehydrate under negative pressure for 30 minutes; raise the temperature to 120°C, add ethylene oxide, propylene oxide and butylene oxide in sequence: first add BO, and react until the pressure does not change ; Add EO, r...
Embodiment 2
[0034] A kind of high molecular weight polyether defoamer, compared with embodiment 1, catalyzer is the sodium methylate of 0.07 part, and epoxide is 1200 parts, and surplus material is identical, is processed by the method described in embodiment 1, gained defoamer The molecular weight is 6000-8000.
Embodiment 3
[0036] A kind of high molecular weight polyether defoamer, compared with embodiment 1, catalyzer is the potassium tert-butoxide of 0.07 part, and epoxide is 1500 parts, and surplus material is identical, processes by the method described in embodiment 1, gained defoamer The molecular weight of the foaming agent is 7000-8500.
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Abstract
The invention relates to a high-molecular-weight polyether defoamer. The defoamer is a polymer of which the molecular structure is an initiator+BO+EO+PO structure, and is prepared from the following components in parts by mass: 0.07 part of catalyst, 10 parts of initiator, 1000-2300 parts of BO+EO+PO, 3 parts of isooctanoic acid and 1 part of oxydol. A preparation method of the defoamer comprises the following steps: putting the initiator and the catalyst into a high-pressure reaction kettle; respectively adding epoxyethane, epoxypropane and epoxybutane in turn; adding the isooctanoic acid, and performing stirring for 10 minutes while keeping the temperature; adding the oxydol, and performing stirring for 10 minutes while keeping the temperature; performing cooling to 60 DEG C; and performing discharging. Through the optimal selection of the catalyst and the optimal ratio of the raw materials, according to a polymerization process, the molecular weight of the prepared defoamer product is apparently higher than that of the existing product, so that the product provided by the invention obtains favorable hydrophilicity and hydrophobicity, thereby greatly improving the defoaming performance of the product provided by the invention; and meanwhile, the product provided by the invention also has the advantages of causing no influence on the cleaning effect of a degreaser, being environmentally friendly, etc.
Description
technical field [0001] The invention belongs to the technical field of chemical additives, and in particular relates to a high-molecular-weight polyether defoamer for metal spray cleaning and a preparation method thereof. Background technique [0002] Metals (such as copper, zinc, etc.) and metal parts need to be treated with anti-rust oil when they are stored. The main components of anti-rust oil are grease and mineral oil, and metals need to be degreased before use ( That is, to remove the anti-rust oil on the metal surface). Metal degreasing treatment generally adopts two methods of spray cleaning or swing cleaning. Spray cleaning is to put the metal into the spray tank containing degreasing agent, and clean the metal containing anti-rust oil through high-pressure spray for a period of time; swing cleaning It is to put the metal into the bath containing degreasing agent, and the purpose of cleaning is achieved by swinging the metal. [0003] The degreasing agent is main...
Claims
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Application Information
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