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A kind of oleate modified silicone defoamer for coating and preparation method thereof

An organosilicon defoamer and oleate technology are applied in the field of oleate modified organosilicon defoamer for coating and its preparation, which can solve the problem of poor compatibility, high melting point and easy demulsification of paper coating and coating. and other problems, to achieve the effect of solving demulsification and defoaming, good chemical stability and simple production process

Active Publication Date: 2021-10-29
ZHEJIANG TRANSFAR WHYYON CHEM
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AI Technical Summary

Problems solved by technology

Silicone emulsion, especially the silicone emulsion defoamer with silicone oil and silicone paste as the main defoaming components, is not well dispersed in the spray coating, and the demulsification of the defoamer is easy to precipitate silicone oil, resulting in silicon spots and silicon spots on the paper after spraying. Dirt; polyether defoamers are also used as paint defoamers, which are sensitive to temperature, and the temperature change during spraying will greatly reduce the effect of polyether defoamers; mineral oil defoamers are used in spray coating It is also widely used, but the mineral oil defoamer with good defoaming effect often has a high melting point, and it is easy to crystallize and precipitate in a low temperature environment, making it difficult to use
Patent CN110960892A discloses a paint defoamer, the main components are polyether silicon, silicon dioxide, and hydrocarbonated oil, which improves the defoaming problem in high-viscosity paints, but a new problem has arisen: silicon dioxide is easy to Silicon scale and silicon spots are formed in the paint; patent CN106810934A discloses a high-build paint defoamer and its preparation method, wherein the defoamer includes methyl silicone oil, higher fatty alcohol, and modified glycerol polyether. It is difficult to emulsify in the system, easy to break the emulsion, and the melting point of higher fatty alcohol is high, and it is easy to crystallize and precipitate solid at low temperature, which makes it difficult to use
In addition, not only the problem of defoaming performance must be considered, but also the affinity of silicon-containing substances in the defoamer in the coating must be considered. The poor affinity of the defoamer leads to poor compatibility with paper coatings and easy Oil stains, shrinkage cavities and other paper defects are formed on the paper, and the defoaming active ingredients in pure mineral oil or high-carbon alcohol have a high freezing point, which is easy to solidify in the colder northern environment in winter, resulting in the precipitation and crystallization of the defoamer system. Convenience, these will cause obstacles to the use of defoamers

Method used

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  • A kind of oleate modified silicone defoamer for coating and preparation method thereof
  • A kind of oleate modified silicone defoamer for coating and preparation method thereof
  • A kind of oleate modified silicone defoamer for coating and preparation method thereof

Examples

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Effect test

Embodiment 1

[0041] 1) Put isooctyl alcohol and oleic acid with a molar ratio of 1:0.85 in the reactor and start stirring, add 0.1% methanesulfonic acid catalyst of the total mass of the system materials, start to heat up and at the same time open the vacuum to -0.08MPa, and heat up to Insulate and react at 140°C for 6 hours, then turn off the vacuum to end the reaction to obtain the esterified intermediate A;

[0042]2) Put the esterified product intermediate A with a molar ratio of 1:1.5 and the hydrogen-containing silicone oil with a hydrogen content of 0.05% into another reaction kettle and start stirring, and remove it at a vacuum degree of -0.090MPa and a temperature of 85°C. Water, removal of low-boiling point impurities, the treatment time is 30min, then turn off the vacuum, add 0.1% chloroplatinic acid catalyst of the total mass of the system material, in N 2 Under ambient conditions, the temperature was raised to 90°C for 6 hours to complete the reaction, and the oleic acid ester...

Embodiment 2

[0046] 1) Put isooctyl alcohol and oleic acid with a molar ratio of 1:1 in the reactor and start stirring, add 0.25% p-toluenesulfonic acid catalyst of the total mass of the system materials, start to heat up and at the same time turn on the vacuum to -0.085MPa, heat up Heat the reaction at 120°C for 3 hours, and then turn off the vacuum to end the reaction to obtain the esterified intermediate A;

[0047] 2) Put the esterified product intermediate A with a molar ratio of 1:1 and the hydrogen-containing silicone oil with a hydrogen content of 0.1% in another reactor and start stirring, and carry out at a vacuum of -0.090MPa and a temperature of 90°C Remove water, remove low boiling point impurity treatment, treatment time is 20min, turn off vacuum then, add the chloroplatinic acid catalyst of 0.25% of system material gross mass, in N 2 Under ambient conditions, the temperature was raised to 100°C for 4 hours to complete the reaction, and the oleic acid ester modified silicone ...

Embodiment 3

[0051] 1) Put isooctyl alcohol and oleic acid with a molar ratio of 1:1.15 in the reactor and start stirring, add 0.5% sulfamic acid catalyst of the total mass of the system materials, start to heat up and at the same time turn on the vacuum to -0.09MPa, and heat up to Insulate and react for 4 hours at 160°C, then turn off the vacuum to end the reaction to obtain the esterified intermediate A;

[0052] 2) Put the esterified product intermediate A with a molar ratio of 1:0.5 and the hydrogen-containing silicone oil with a hydrogen content of 0.36% in another reactor and start stirring at a vacuum of -0.090MPa and a temperature of 95°C. Remove water, remove low boiling point impurity treatment, treatment time is 25min, turn off vacuum then, add the 0.5% chloroplatinic acid catalyst of system material gross mass, in N 2 Under ambient conditions, the temperature was raised to 115°C for 2 hours to complete the reaction, and the oleic acid ester modified silicone defoamer active sub...

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Abstract

The invention discloses an oleic acid ester modified silicone defoamer for coating and a preparation method thereof. The present invention at first carries out esterification reaction with oleic acid and alcohols, obtains esterified product intermediate; Then in N 2 In the protected catalyst system, the addition reaction of hydrogen-containing silicone oil and the esterified product intermediate is used to obtain the active substance of the oleic acid ester modified silicone defoamer; Mineral oil and emulsifier are compounded to prepare oleic acid ester modified silicone defoamer. The oleic acid ester modified silicone defoamer produced according to the present invention is applied to eliminate foam in papermaking coating, has little negative impact on coating coating and paper surface mechanical properties, and has low dosage and high defoaming speed. Fast, strong anti-foaming ability, non-toxic and harmless, simple production process and so on.

Description

technical field [0001] The invention relates to the field of fine chemicals, in particular to an oleic acid ester modified organic silicon defoamer for coating and a preparation method thereof. Background technique [0002] As we all know, coatings are mainly composed of pigments, adhesives and functional additives, and the adhesives mainly include styrene-butadiene latex, VAE emulsion, acrylic emulsion and other easy-to-foam components. In the process of coating coating preparation, foaming is easy to occur, and in the subsequent paper spraying process, uneven spraying and unevenness of paper spraying are often caused. Therefore, it is necessary to add a defoamer in the process of preparing the coating to reduce the degree of system foaming. [0003] At present, the main paint defoamers on the market include silicones, polyethers, and mineral oils, all of which can eliminate the foam produced in paper spray coatings to varying degrees, but there are also some problems. Si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D19/04C08G77/38C08G77/12
CPCB01D19/0404B01D19/0409C08G77/12C08G77/38
Inventor 杨磊查汪敏梁福根刘潇潇李华杰谢青宇李德品
Owner ZHEJIANG TRANSFAR WHYYON CHEM
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