Preparation method of water-based polyurethane/acrylate compound emulsion used for damping paint

A water-based polyurethane and acrylate technology, applied in coatings and other directions, can solve the problems of complex process, narrow temperature range of emulsion damping, and use restrictions, and achieve the effect of overcoming high temperature viscous flow and low VOC content

Inactive Publication Date: 2019-02-12

吉林希尔工业新材料技术有限公司

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Problems solved by technology

[0004] The publication number is CN 101508762A, which discloses a method for preparing a polyester polyurethane damping material. The damping temperature range of the emulsion prepared by this method is narrow, and its use is limited.

The publication num...

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Abstract

The invention discloses water-based polyurethane/acrylate compound emulsion used for paint, and belongs to the technical field of paint. The emulsion is prepared from polyether polyol, polyisocyanatemonomer, castor oil, a micro-molecule chain extender, a hydrophilic chain extender, a salt-forming agent, an end-capping agent, acrylate monomer and the like. The invention further provides a preparation method of the water-based polyurethane/acrylate compound emulsion; according to the method, the polyether polyol, the polyisocyanate monomer, the castor oil and the hydrophilic chain extender aresubjected to step-by-step polymerization according to a certain ratio, then the end-capping agent is added for end capping, end-capped anionic water-based polyurethane emulsion is prepared, and then the acrylate monomer and styrene are added for continuous polymerization, so that the core-shell water-based polyurethane/acrylate compound emulsion is formed. After the water-based polyurethane emulsion used for the wide-temperature range damping paint is subjected to finishing and film forming, tan delta>=0.3, and an effective temperature range can be higher than 160 DEG C.

Application Domain

Coatings

Technology Topic

IsocyanateEmulsion +9

Image

Examples

Experimental program(4)

Example Embodiment

[0038] Example 1

[0039] In a four-necked flask equipped with a stirring device, a condenser, a thermometer and protected by nitrogen, add 40 g of polytetrahydrofuran glycol (number average molecular weight of 2000), vacuum dehydration at 100°C for 1.5 hours, and then add isophor 26g of ketone diisocyanate, 4g of castor oil, 3g of small molecule chain extender 1,4-butanediol, 6g of hydrophilic chain extender dimethylolpropionic acid and 0.1g of catalyst dibutyltin dilaurate. The system is heated to 75 React for 2h at °C, add 5g of hydroxyethyl methacrylate, a blocking agent, and react for 1h.

[0040] The temperature of the system was quickly cooled to 30°C, 70ml of acetone was added to reduce the viscosity, when the -NCO value of the system reached the theoretical value, 4g of salt-forming agent triethylamine was added, the reaction was continued for 10 minutes, and then deionized water was added to adjust the rotation of the stirring device 1000rad/min, emulsify at room temperature for 30min to obtain an aqueous polyurethane emulsion.

[0041] The system is rapidly heated to 60°C, an emulsifier and an initiator are added, 8 g of styrene and 20 g of butyl acrylate are added dropwise, and the reaction is carried out for 4.5 hours to obtain an aqueous polyurethane/acrylate composite emulsion.

[0042] figure 1 This is the infrared spectrum of the film made of the water-based polyurethane/acrylate composite emulsion of a wide temperature range damping coating prepared in Example 1 of the present invention. It can be seen from the figure that the present invention successfully prepared the water-based polyurethane/acrylate composite emulsion ;

[0043] figure 2 This is the dynamic mechanical analysis curve of a wide temperature range damping coating water-based polyurethane emulsion prepared in Example 1 of the present invention. It can be seen from the figure that the water-based polyurethane prepared by the present invention has effective damping (tanδ> 0.3) The temperature range is -24℃~140℃.

Example Embodiment

[0044] Example 2

[0045] In a four-necked flask equipped with a stirring device, a condenser, a thermometer and protected by nitrogen, add 40 g of polytetrahydrofuran glycol (number average molecular weight of 2000), vacuum dehydration at 100°C for 1.5 hours, and then add isophor 26g of ketone diisocyanate, 3g of castor oil, 4g of small molecule chain extender 1,4-butanediol, 6g of hydrophilic chain extender dimethylolpropionic acid and 0.1g of catalyst dibutyltin dilaurate. The system is heated to 75 React for 2h at °C, add 4g of hydroxyethyl methacrylate, a blocking agent, and react for 1h.

[0046] The temperature of the system was quickly cooled to 30°C, 70ml of acetone was added to reduce the viscosity, when the -NCO value of the system reached the theoretical value, 4g of salt-forming agent triethylamine was added, the reaction was continued for 10 minutes, and then deionized water was added to adjust the rotation of the stirring device 1000rad/min, emulsify at room temperature for 30min to obtain an aqueous polyurethane emulsion.

[0047] The system is rapidly heated to 60° C., emulsifiers and initiators are added, 14 g of styrene and 14 g of butyl acrylate are added dropwise, and the reaction is carried out for 4.5 hours to obtain an aqueous polyurethane/acrylate composite emulsion.

[0048] image 3 This is the dynamic mechanical analysis curve of a wide temperature range damping coating water-based polyurethane emulsion prepared in Example 2 of the present invention. It can be seen from the figure that the water-based polyurethane prepared by the present invention has effective damping (tanδ> 0.3) The temperature range is at least 125°C.

Example Embodiment

[0049] Example 3

[0050] In a four-necked flask equipped with a stirring device, a condenser, a thermometer and protected by nitrogen, add 20g of polypropylene glycol polyether (number average molecular weight is 1000), vacuum dehydration at 100℃ for 1.5h, and then add toluene diisocyanate 20g, castor oil 5g, small molecule chain extender propylene glycol 4g, hydrophilic chain extender dimethylolpropionic acid 6g, and catalyst dibutyltin dilaurate 0.1g, the system is heated to 75°C for 2h, and end capping agent A is added 5g hydroxyethyl acrylate, react for 1h.

[0051] The temperature of the system was quickly cooled to 30°C, 50ml of acetone was added to reduce the viscosity, when the -NCO value of the system reached the theoretical value, 4g of salt-forming agent triethylamine was added, and the reaction was continued for 10 minutes, and then deionized water was added, and the rotation of the stirring device was adjusted to 1000rad/min, emulsify at room temperature for 30min to obtain an aqueous polyurethane emulsion.

[0052] The system is rapidly heated to 60° C., emulsifier and initiator are added, 11 g of styrene and 17 g of n-butyl acrylate are added dropwise, and the reaction is carried out for 4.5 hours to obtain a water-based polyurethane/acrylate composite emulsion.

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Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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Classification and recommendation of technical efficacy words

Low VOC content

Preparation method of water-based polyurethane/acrylate compound emulsion used for damping paint

A water-based polyurethane and acrylate technology, applied in coatings and other directions, can solve the problems of complex process, narrow temperature range of emulsion damping, and use restrictions, and achieve the effect of overcoming high temperature viscous flow and low VOC content

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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