CN-122011743-A - Polyurethane coated ammonium bicarbonate composite foam material and application thereof in water-based damping paint

CN122011743ACN 122011743 ACN122011743 ACN 122011743ACN-122011743-A

Abstract

The invention provides an application of a polyurethane coated ammonium bicarbonate composite foam material in a water-based damping paint. The composite foaming material consists of modified polyurethane and ammonium bicarbonate, wherein the modified polyurethane is reacted with isocyanate through amino functional groups to introduce structural units for enhancing crosslinking degree so as to improve the compatibility and foaming performance of the modified polyurethane and the ammonium bicarbonate. The composite foam material has excellent foaming effect, sound insulation, shock absorption and thermal stability, and can remarkably improve the sound insulation, shock absorption performance and stability of the coating when being applied to the water-based damping coating. By introducing modified polyurethane, the prepared coating has shorter gel forming time, higher sound insulation attenuation value, better damping effect and stronger thermal stability, can maintain excellent performance especially in a high-temperature environment, and is widely applicable to noise and vibration resistant materials in the fields of buildings and automobiles.

Inventors

XU PING
JIN XINGGUO
ZHANG CHENG
LV XIAOJING
HUANG WENCHAO
Luan Linsen
GUO XINXIANG
ZHAO CHEN

Assignees

艾华(浙江)新材料有限公司

Dates

Publication Date: 20260512
Application Date: 20260306

Claims (10)

1. The polyurethane coated ammonium bicarbonate composite foaming material is characterized by comprising, by weight, 60-80 parts of modified polyurethane, 10-30 parts of ammonium bicarbonate, 0.5-2 parts of a surfactant, 0.5-2 parts of a stabilizer, 0.2-1 part of an antioxidant, 1-3 parts of a plasticizer and 1-3 parts of a toughening agent, wherein the modified polyurethane reacts with isocyanate through an amino functional group, a structural unit for enhancing the crosslinking degree is introduced, and the plasticizer and the toughening agent are added into the polyurethane.
2. The polyurethane-coated ammonium bicarbonate composite foam material disclosed in claim 1 is characterized in that the modified polyurethane comprises, by weight, 50-70 parts of polyurethane prepolymer, 10-15 parts of toluene diisocyanate, 1-3 parts of dioctyl phthalate, 1-3 parts of polyether polyol, 0.5-2 parts of ethylenediamine and 0.5-2 parts of melamine.
3. The polyurethane-coated ammonium bicarbonate composite foam material according to claim 1 or 2, wherein the preparation method of the modified polyurethane comprises the following steps: (1) Mixing polyether polyol and toluene diisocyanate according to a molar ratio of 1:2-1:3 to obtain a reaction mixture; (2) Adding dioctyl phthalate and polyether polyol into the reaction mixture, and uniformly stirring; (3) Adding ethylenediamine into the reaction mixture, and stirring and reacting for 30 minutes to form modified polyurethane; (4) Adding melamine into the reaction system, and continuously stirring; (5) After the reaction is completed, cooling to room temperature to obtain modified polyurethane, removing residual solvent in vacuum, and granulating to obtain a final product.
4. The polyurethane-coated ammonium bicarbonate composite foam material according to claim 3, wherein the mixing temperature in the step (1) is 80-100 ℃.
5. The polyurethane-coated ammonium bicarbonate composite foam material according to claim 3, wherein the stirring condition in the step (2) is stirring for 1-2 hours at 100-120 ℃.
6. The polyurethane-coated ammonium bicarbonate composite foam material according to claim 3, wherein the stirring reaction in the step (4) is carried out for 1-2 hours, and the temperature is controlled at 120-130 ℃.
7. The polyurethane-coated ammonium bicarbonate composite foam material according to claim 3, wherein the granulation treatment in the step (5) is performed at 80-120 ℃, and the polyurethane material is cooled by air cooling to form particles with a size of 1-3 mm.
8. The polyurethane coated ammonium bicarbonate composite foam material of claim 1 is characterized in that the surfactant is formed by mixing sodium dodecyl benzene sulfonate and ethoxylated olefin according to a mass ratio of 1:2, the stabilizer is formed by mixing benzophenone and triphenyl phosphite serving as a heat stabilizer according to a mass ratio of 1:1, the antioxidant is formed by mixing tert-butyl-p-cresol and hypophosphite according to a mass ratio of 1:0.5, the plasticizer is formed by mixing dioctyl phthalate and diethyl succinate according to a mass ratio of 3:1, and the toughening agent is formed by mixing polyether polyol and polyester polyol according to a mass ratio of 2:1.
9. A method for preparing a polyurethane-coated ammonium bicarbonate composite foam material, wherein the polyurethane-coated ammonium bicarbonate composite foam material is as set forth in any one of claims 1 to 8, and is characterized by comprising the following steps: s1, mixing modified polyurethane with ammonium bicarbonate, adding a surfactant, a stabilizer, an antioxidant, a plasticizer and a toughening agent, and uniformly stirring to obtain a composite foaming mixture; S2, carrying out heating reaction on the composite foaming mixture, and reacting for 1-2 hours at 80-120 ℃ to ensure that all components are fully mixed to form a uniform composite foaming material; and S3, cooling to room temperature to obtain the final polyurethane coated ammonium bicarbonate composite foam material.
10. The application of the polyurethane-coated ammonium bicarbonate composite foam material in the water-based damping paint, which is characterized in that the polyurethane-coated ammonium bicarbonate composite foam material is mixed with water-based resin, filler and water-based solvent to obtain the water-based damping paint, wherein the water-based resin is acrylate resin, the filler is quartz powder, the water-based solvent is deionized water, and the addition amount of the composite foam material is 5% -20% of the total mass of the water-based damping paint.

Description

Polyurethane coated ammonium bicarbonate composite foam material and application thereof in water-based damping paint Technical Field The invention relates to a composite foaming material and the application field thereof, in particular to an application of a polyurethane coated ammonium bicarbonate composite foaming material in water-based damping paint. Background The existing water-based damping paint is mainly used for sound insulation and shock absorption and is widely applied to the fields of buildings, automobiles, industrial equipment and the like. Conventional aqueous damping coatings generally rely on conventional foam materials, such as polyurethane foam, polyethylene foam, and the like, which are effective in improving the sound and vibration damping properties of the coating. However, the conventional foaming material has some defects, such as insufficient environmental protection, poor stability, complex production process and the like, and limits the application of the foaming material in high-performance paint. In recent years, with the improvement of environmental protection requirements and the continuous development of functional materials, the industry demand for water-based damping coatings is increasingly paying attention to environmental protection, diversity of performances and long-term stability of the coatings. Particularly in terms of foaming agents for coatings, alternative materials that are more environmentally friendly and have higher properties are sought to be the focus of research. Ammonium bicarbonate is used as a harmless and environment-friendly foaming agent and has good foaming characteristics, but the ammonium bicarbonate has poor compatibility with the conventional polyurethane material, so that the application of the ammonium bicarbonate in the composite foaming material is limited. In order to solve the problem, researchers try to improve the compatibility and foaming effect of the modified polyurethane coated ammonium bicarbonate, so as to achieve the purpose of improving the performance of the water-based damping paint. Therefore, a composite foaming material of polyurethane coated ammonium bicarbonate is urgently needed, and application of the composite foaming material in water-based damping paint is discussed, so that the performance of the water-based damping paint is improved through innovative material design, and meanwhile, the requirements of environmental protection and high performance are met. Disclosure of Invention In order to overcome the defects of the water-based damping coating foaming material in the prior art in the aspects of environmental protection and performance stability, the invention aims to provide the application of the polyurethane-coated ammonium bicarbonate composite foaming material in the water-based damping coating. The composite foaming material adopts a composite structure of modified polyurethane and ammonium bicarbonate, and the dispersibility and stability of the ammonium bicarbonate in the polyurethane are obviously improved through an innovative coating technology, so that the sound insulation and shock absorption performance of the water-based damping coating are improved. According to the invention, the polyurethane is used for coating the ammonium bicarbonate, so that the foaming effect, performance stability and environmental protection of the water-based damping paint can be improved, and the polyurethane-coated ammonium bicarbonate water-based damping paint has a good application prospect. The aim of the invention can be achieved by the following technical scheme: The polyurethane-coated ammonium bicarbonate composite foaming material comprises, by weight, 60-80 parts of modified polyurethane, 10-30 parts of ammonium bicarbonate, 0.5-2 parts of a surfactant, 0.5-2 parts of a stabilizer, 0.2-1 part of an antioxidant, 1-3 parts of a plasticizer and 1-3 parts of a toughening agent, wherein the modified polyurethane reacts with isocyanate through an amino functional group, a structural unit for enhancing the crosslinking degree is introduced, and the plasticizer and the toughening agent are added into the polyurethane to improve the flexibility and the compatibility with the ammonium bicarbonate. The modified polyurethane comprises, by weight, 50-70 parts of polyurethane prepolymer, 10-15 parts of toluene diisocyanate, 1-3 parts of dioctyl phthalate, 1-3 parts of polyether polyol, 0.5-2 parts of ethylenediamine and 0.5-2 parts of melamine. Optionally, the preparation method of the modified polyurethane comprises the following steps: (1) Mixing polyether polyol and toluene diisocyanate according to a molar ratio of 1:2-1:3 until the content of isocyanate groups reaches 0.5% -1.5%, and obtaining a reaction mixture; (2) Adding dioctyl phthalate and polyether polyol into the reaction mixture, and uniformly stirring to completely disperse the plasticizer and the toughening agent; (3) Adding ethylenediamine into the reaction