Film-forming aid and preparation method thereof

Abstract

The invention belongs to an emulsion film-forming technology, and particularly relates to a film-forming aid and a preparation method thereof. The structural expression formula of the film-forming aidis shown in the specification, and R1 and R2 independently represent any one of a substituted or unsubstituted C1-C20 alkyl group, a substituted or unsubstituted C2-C20 alkenyl group, a substituted or unsubstituted C2-C20 alkynyl group and a substituted and unsubstituted C1-C20 alkoxy group. Excellent film-forming property can be realized only by adding 4wt% of the film-forming aid prepared by the invention into the emulsion, the film-forming temperature is about 14 DEG C, a transparent continuous coating can be formed and the whitening phenomenon is avoided, and the paint has good compatibility, has a boiling point of about 270 DEG C, does not cause migration of organic compounds to the surface, is not easy to volatilize, has low VOC emission, is safe and environment-friendly, and has awide market prospect.

Description

technical field

[0001] The invention belongs to emulsion film-forming technology, and in particular relates to a film-forming auxiliary agent and a preparation method thereof. Background technique

[0002] Most of the film-forming aids currently used are high-boiling organic compounds. Although they are non-VOC, as time goes by, these high-boiling organic compounds will eventually slowly migrate to the surface of the paint and volatilize into the atmosphere, which not only pollutes Air also brings defects such as poor adhesion resistance, poor scratch resistance, and easy dusting to the coating film; in some occasions, low-boiling film-forming aids are selected, and they will inevitably volatilize and generate VOC. Coatings such as latex paint prepared by existing film-forming aids, after being used for the inner wall of the wall, if the wall is located in a sunny place, serious fading will generally occur within 5 years. Moreover, if the film-forming aid is applied and dri...

Examples

preparation example Construction

[0060] The second aspect of the present invention provides a kind of preparation method of above-mentioned film-forming aid, comprises the steps:

[0061] (1) will React with catalyst I at 60-200°C for 1-4h;

[0062] (2) Add catalyst II and react at 60-200° C. for 3-7 hours to obtain the film-forming aid.

[0063] In one embodiment, the preparation method of the film-forming aid comprises the steps of:

[0064] (1) will React with Catalyst I at 90°C for 4h;

[0065] (2) Add catalyst II and react at 120° C. for 4 hours to obtain the film-forming aid.

[0066] The present invention adopts It is a reactant, and adopts boron trifluoride, sodium alkoxide or a mixture of hydroxide and quaternary ammonium salt as a catalyst, and the film-forming aid prepared by step-by-step catalytic reaction has good compatibility with any polymer emulsion. Does not cause demulsification during production, especially when R 3 When it is methyl or ethyl, and R4 is n-propyl and n-butyl, it c...

Embodiment 1

[0076] Embodiment 1 provides a kind of film-forming aid M 1 , the coalescent M 1 The structural expression of is: where the R 11 Indicates -CH 2 -, R 21 Indicates -CH 2 CH 2 CH 3 ;

[0077] The film-forming aid M 1 The reaction raw materials are: (A 1 , where the R 31 Indicates -CH 2 -), (B 1 , where the R 41 Indicates -CH 2 CH 2 CH 3 ), boron trifluoride, catalyst II; said A 1 , B 1 The molar ratio of the boron trifluoride is 1:1; the quality of the boron trifluoride is A 1 , B 1 0.1wt% of the total mass; the catalyst II is a mixture of sodium methylate and tetrapropylammonium bromide; the mass ratio of the sodium methylate and tetrapropylammonium bromide is 1:1; the quality of the sodium methylate is A 1 , B 1 0.6 wt% of the total mass.

[0078] The preparation method of described film-forming aid, comprises the steps:

[0079] (1) put A 1 , B 1 React with boron trifluoride at 90°C for 4h;

[0080] (2) Add catalyst II again and react at 120°C ...

Embodiment 2

[0082] Embodiment 2 provides a kind of film-forming aid M 2, the coalescent M 2 The structural expression of is: where the R 12 Indicates -CH 2 CH 2 -, R 22 Indicates -CH 2 CH 2 CH 2 CH 3 ;

[0083] The film-forming aid M 2 The reaction raw materials are: (A 2 , where the R 32 Indicates -CH 2 CH 2 -), (B 2 , where the R 42 Indicates -CH 2 CH 2 CH 2 CH 3 ), boron trifluoride, catalyst II; said A 2 , B 2 The molar ratio of the boron trifluoride is 1:1; the quality of the boron trifluoride is A 2 , B 2 0.1wt% of the total mass; the catalyst II is a mixture of sodium ethylate and tetrabutylammonium bromide; the mass ratio of sodium ethylate and tetrabutylammonium bromide is 1:1; the quality of the sodium ethylate is A 2 , B 2 0.6 wt% of the total mass.

[0084] The preparation method of described film-forming aid, comprises the steps:

[0085] (1) put A 2 , B 2 React with boron trifluoride at 90°C for 4h;

[0086] (2) Add catalyst II again and r...

technical field

[0001] The invention belongs to emulsion film-forming technology, and in particular relates to a film-forming auxiliary agent and a preparation method thereof. Background technique

[0002] Most of the film-forming aids currently used are high-boiling organic compounds. Although they are non-VOC, as time goes by, these high-boiling organic compounds will eventually slowly migrate to the surface of the paint and volatilize into the atmosphere, which not only pollutes Air also brings defects such as poor adhesion resistance, poor scratch resistance, and easy dusting to the coating film; in some occasions, low-boiling film-forming aids are selected, and they will inevitably volatilize and generate VOC. Coatings such as latex paint prepared by existing film-forming aids, after being used for the inner wall of the wall, if the wall is located in a sunny place, serious fading will generally occur within 5 years. Moreover, if the film-forming aid is applied and dri...

Examples

preparation example Construction

[0060] The second aspect of the present invention provides a kind of preparation method of above-mentioned film-forming aid, comprises the steps:

[0061] (1) will React with catalyst I at 60-200°C for 1-4h;

[0062] (2) Add catalyst II and react at 60-200° C. for 3-7 hours to obtain the film-forming aid.

[0063] In one embodiment, the preparation method of the film-forming aid comprises the steps of:

[0064] (1) will React with Catalyst I at 90°C for 4h;

[0065] (2) Add catalyst II and react at 120° C. for 4 hours to obtain the film-forming aid.

[0066] The present invention adopts It is a reactant, and adopts boron trifluoride, sodium alkoxide or a mixture of hydroxide and quaternary ammonium salt as a catalyst, and the film-forming aid prepared by step-by-step catalytic reaction has good compatibility with any polymer emulsion. Does not cause demulsification during production, especially when R 3 When it is methyl or ethyl, and R4 is n-propyl and n-butyl, it c...

Embodiment 1

[0076] Embodiment 1 provides a kind of film-forming aid M 1 , the coalescent M 1 The structural expression of is: where the R 11 Indicates -CH 2 -, R 21 Indicates -CH 2 CH 2 CH 3 ;

[0077] The film-forming aid M 1 The reaction raw materials are: (A 1 , where the R 31 Indicates -CH 2 -), (B 1 , where the R 41 Indicates -CH 2 CH 2 CH 3 ), boron trifluoride, catalyst II; said A 1 , B 1 The molar ratio of the boron trifluoride is 1:1; the quality of the boron trifluoride is A 1 , B 1 0.1wt% of the total mass; the catalyst II is a mixture of sodium methylate and tetrapropylammonium bromide; the mass ratio of the sodium methylate and tetrapropylammonium bromide is 1:1; the quality of the sodium methylate is A 1 , B 1 0.6 wt% of the total mass.

[0078] The preparation method of described film-forming aid, comprises the steps:

[0079] (1) put A 1 , B 1 React with boron trifluoride at 90°C for 4h;

[0080] (2) Add catalyst II again and react at 120°C ...

Embodiment 2

[0082] Embodiment 2 provides a kind of film-forming aid M 2, the coalescent M 2 The structural expression of is: where the R 12 Indicates -CH 2 CH 2 -, R 22 Indicates -CH 2 CH 2 CH 2 CH 3 ;

[0083] The film-forming aid M 2 The reaction raw materials are: (A 2 , where the R 32 Indicates -CH 2 CH 2 -), (B 2 , where the R 42 Indicates -CH 2 CH 2 CH 2 CH 3 ), boron trifluoride, catalyst II; said A 2 , B 2 The molar ratio of the boron trifluoride is 1:1; the quality of the boron trifluoride is A 2 , B 2 0.1wt% of the total mass; the catalyst II is a mixture of sodium ethylate and tetrabutylammonium bromide; the mass ratio of sodium ethylate and tetrabutylammonium bromide is 1:1; the quality of the sodium ethylate is A 2 , B 2 0.6 wt% of the total mass.

[0084] The preparation method of described film-forming aid, comprises the steps:

[0085] (1) put A 2 , B 2 React with boron trifluoride at 90°C for 4h;

[0086] (2) Add catalyst II again and r...

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