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Formaldehyde removing agent and preparation method therefor

A technology of aldehyde removal agent and catalyst, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve the problems of reducing the purification efficiency of formaldehyde and the inability to effectively enrich aldehyde removal substances.

Active Publication Date: 2015-12-16
BAUHINIA PAINTS SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problem that in the existing chemical aldehyde removal process, the aldehyde removal substance cannot be effectively enriched on the surface of the paint film, thus reducing the efficiency of formaldehyde purification, one of the purposes of the present invention is to provide an aldehyde removal agent, which Aldehyde molecules contain polysiloxane structure, the low surface tension of polysiloxane will automatically migrate to the surface of the paint film for enrichment, and at the same time carry aldehyde-removing functional groups (methylene active hydrogen) to form surface enrichment, so that The formaldehyde-removing group can be fully and effectively utilized to strengthen the removal of formaldehyde and improve the efficiency of formaldehyde removal

Method used

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  • Formaldehyde removing agent and preparation method therefor
  • Formaldehyde removing agent and preparation method therefor
  • Formaldehyde removing agent and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] 1) Put 100.0 g of self-made branched hydroxyl-terminated polysiloxane (hydroxyl value 605, molecular weight 1112), 170.5 g of tert-butyl acetoacetate and 0.5 g of p-toluenesulfonic acid into a four-necked flask;

[0088] 2) The four-necked flask described in step 1) was ventilated with nitrogen, slowly heated, started stirring after melting, and the temperature was raised to 100-130°C for 3-4 hours, and the branched hydroxyl-terminated polysiloxane and acetoacetic acid The tert-butyl ester is transesterified, and the by-product tert-butanol will be discharged, and the discharged tert-butanol will be collected and weighed;

[0089] 3) Raise the reaction temperature to 130-170° C. to react, so that the by-product tert-butanol in step 2) has a suitable discharge rate, and take a sample for gas chromatography detection. When the tert-butyl acetoacetate content is less than 0.1%, stop the reaction. Cooling, diluting, packaging, the weight average molecular weight of the prod...

Embodiment 2

[0091] 1) Put 100.0 g of self-made branched hydroxyl-terminated polysiloxane (hydroxyl value 578, molecular weight 2134), 162.9 g of tert-butyl acetoacetate and 0.5 g of p-toluenesulfonic acid into a four-necked flask;

[0092] 2) The four-necked flask described in step 1) was ventilated with nitrogen, slowly heated, started stirring after melting, and the temperature was raised to 100-130°C for 3-4 hours, and the branched hydroxyl-terminated polysiloxane and acetoacetic acid The tert-butyl ester is transesterified, and the by-product tert-butanol will be discharged, and the discharged tert-butanol will be collected and weighed;

[0093] 3) Raise the reaction temperature to 130-170° C. to react, so that the by-product tert-butanol in step 2) has a suitable discharge rate, and take a sample for gas chromatography detection. When the tert-butyl acetoacetate content is less than 0.1%, stop the reaction. Cooling, diluting, packaging, the weight average molecular weight of the prod...

Embodiment 3

[0095] 1) Put 100.0g of self-made branched hydroxyl-terminated polysiloxane (hydroxyl value 259, molecular weight 11248), 73g of tert-butyl acetoacetate and 0.5g of p-toluenesulfonic acid into a four-necked flask;

[0096] 2) The four-necked flask described in step 1) was ventilated with nitrogen, slowly heated, started stirring after melting, and the temperature was raised to 100-130°C for 3-4 hours, and the branched hydroxyl-terminated polysiloxane and acetoacetic acid The tert-butyl ester is transesterified, and the by-product tert-butanol will be discharged, and the discharged tert-butanol will be collected and weighed;

[0097] 3) Raise the reaction temperature to 130-170° C. to react, so that the by-product tert-butanol in step 2) has a suitable discharge rate, and take a sample for gas chromatography detection. When the tert-butyl acetoacetate content is less than 0.1%, stop the reaction. Cooling, diluting, packaging, the weight average molecular weight of the product o...

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Abstract

The invention provides a formaldehyde removing agent and a preparation method therefor. The formaldehyde removing agent has a structure represented by a general formula (I) shown in the description, a general formula (II) shown in the description or a general formula (III) shown in the description. The method comprises the steps of enabling hydroxyl terminated polysiloxane and a methylene containing active hydrogen compound to be subjected to ester exchange reaction so as to remove alkyl alcohol, thereby obtaining the formaldehyde removing agent. By adding the formaldehyde removing agent provided by the invention into paint, the characteristic that a polysiloxane structure in a molecule has relatively low surface tension can be utilized in a paint film drying process, formaldehyde removing functional groups are easily carried and are enriched to the surface of a paint film, and the formaldehyde removing functional groups can be fully utilized to undergo chemical reaction with formaldehyde in air at an interface of the paint film, so that the formaldehyde removing efficiency is remarkably increased, the formaldehyde is removed, and the effect of purifying the air is achieved.

Description

technical field [0001] The invention belongs to the technical field of gas separation, and relates to an aldehyde remover, in particular to an aldehyde remover with a surface enrichment function to strengthen the effect of removing formaldehyde, a preparation method and an application thereof. Background technique [0002] Formaldehyde is a flammable, highly reactive, irritating, colorless, toxic gas at room temperature. Formaldehyde is highly irritating to human skin, eyes, and mucous membranes of the respiratory tract. Acute poisoning can cause symptoms such as runny nose, tearing, and coughing, and cause various respiratory diseases. Chronic inhalation of low-concentration formaldehyde can lead to persistent headache, weakness, insomnia, etc. Long-term skin contact with formaldehyde can cause dermatitis, and also have adverse effects on the human respiratory system, digestive system and central nervous system, resulting in abnormal lung and liver immune function. Therefo...

Claims

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Application Information

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IPC IPC(8): C08G77/38B01D53/72
Inventor 陈超郭家振刘婕妤沈明月许和平
Owner BAUHINIA PAINTS SHANGHAI CO LTD
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