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Insulating waterborne polyurethane dispersion as well as preparation method and application thereof

A water-based polyurethane and dispersion technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of reducing work efficiency, affecting employees' mood, complex construction of two-component resin, and achieving the effect of good electrical insulation

Inactive Publication Date: 2021-02-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1) Organic solvents are used as diluents, containing volatile organic compounds (VOCs), which volatilize into the air during the curing process, producing pungent odors, affecting the mood of employees, and reducing work efficiency;
[0009] 2) VOCs are toxic and harmful gases, and long-term exposure will cause hidden dangers of occupational leukemia for employees;
[0010] 3) Pollution to the environment, environmental protection policy requirements are becoming more and more stringent, facing policy pressure;
[0011] 4) VOCs are flammable and explosive, and there are great safety hazards in the process of production, transportation and storage;
[0012] 5) The construction of two-component resin is complicated, and it must be prepared and used immediately. It is not suitable to mix more than one time, and it must be formulated in strict accordance with the ratio in the product description;
This kind of insulating water-based polyurethane has complex components and is not easy to obtain, and the synthesis of high-performance single-component insulating water-based polyurethane, especially the research on insulating water-based polyurethane with excellent heat resistance and moisture resistance, has rarely been reported.

Method used

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  • Insulating waterborne polyurethane dispersion as well as preparation method and application thereof
  • Insulating waterborne polyurethane dispersion as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Add 62.21g of dimer acid polyester diol PDFA-3190 (hydroxyl value 1mol / kg, functionality 2) and 0g hydroxyl-terminated polybutadiene HTPB into a 500mL three-necked round-bottomed flask equipped with an electric stirrer, a condenser, and a thermometer (hydroxyl value 0.83mol / kg, functionality 2.2), vacuum dehydration at 130°C and 0.01MPa for 2h. Cool down to 60°C, add 22.80g of tetramethylxylylene diisocyanate TMXDI, 0.01g of stannous octoate catalyst, raise the temperature to 100°C, react for 2h, titrate the remaining amount of -NCO with di-n-butylamine until the -NCO content reaches 6.15 wt%. Cool down to 60°C, add 60g each of acetone ACE and methyl acetate MA (1.2 times solvent) to dissolve. The temperature of the system was controlled at 45°C. After the prepolymer was dissolved, 3.84 g of isophoronediamine IPDA was added to extend the chain and react for 15 minutes. Subsequently, 10.28 g of N-(2-aminoethyl)-aminopropionic acid triethylamine salt (AAA) was added as ...

Embodiment 2

[0068] Add 38.32g of dimer acid polyester diol PDFA-3190 (hydroxyl value 1mol / kg, functionality 2) and 25.55g of hydroxyl-terminated polybutadiene into a 500mL three-necked round-bottomed flask equipped with an electric stirrer, condenser, and thermometer HTPB (hydroxyl value 0.83mol / kg, functionality 2.2), vacuum dehydration at 130°C and 0.01MPa for 2h. Cool down to 60°C, add 21.67g of tetramethylxylylene diisocyanate TMXDI, 0.01g of stannous octoate catalyst, raise the temperature to 100°C, react for 2h, titrate the remaining amount of -NCO with di-n-butylamine until the -NCO content reaches 5.81 wt%. Cool down to 60°C, add 60g each of acetone ACE and methyl acetate MA (1.2 times solvent) to dissolve. The temperature of the system was controlled at 45°C. After the prepolymer was dissolved, 3.31 g of isophoronediamine IPDA was added for chain extension and reacted for 15 minutes. Subsequently, 10.28 g of N-(2-aminoethyl)-aminopropionic acid triethylamine salt (AAA) was adde...

Embodiment 3

[0070] Add 32.15g of dimer acid polyester diol PDFA-3190 (hydroxyl value 1mol / kg, functionality 2) and 32.15g of hydroxyl-terminated polybutadiene into a 500mL three-necked round-bottomed flask equipped with an electric stirrer, condenser, and thermometer HTPB (hydroxyl value 0.83mol / kg, functionality 2.2), vacuum dehydration at 130°C and 0.01MPa for 2h. Cool down to 60°C, add 21.38g of tetramethylxylylene diisocyanate TMXDI, 0.01g of stannous octoate catalyst, raise the temperature to 100°C, react for 2h, titrate the remaining amount of -NCO with di-n-butylamine until the -NCO content reaches 5.72 wt%. Cool down to 60°C, add 60g each of acetone ACE and methyl acetate MA (1.2 times solvent) to dissolve. The temperature of the system was controlled at 45°C. After the prepolymer was dissolved, 3.18 g of isophoronediamine IPDA was added to extend the chain and react for 15 minutes. Subsequently, 10.28 g of N-(2-aminoethyl)-aminopropionic acid triethylamine salt (AAA) was added ...

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Abstract

The invention discloses an insulating waterborne polyurethane dispersion as well as a preparation method and application thereof. The polyurethane dispersion is a polyurethane prepolymer (X) obtainedby reacting macromolecular polyol (A) with a specific structure and an isocyanate group-containing compound (B), and is prepared by the following steps: adding a solvent for dilution; further, an amine chain extender (C1) and a carboxylate hydrophilic chain extender (D) are added for reaction to form a mixture, then a certain amount of water for dispersion is added to obtain a crude waterborne polyurethane dispersion, and finally, a specific amount of a chain extender (C2) is added for reaction to obtain the waterborne polyurethane adhesive. The waterborne polyurethane dispersoid prepared by the method has good electrical insulating property, heat resistance and damp-heat resistance, and can be used as an insulating coating for electrical or electronic devices, especially suitable for being used as a packaging insulating coating on a printed circuit board.

Description

technical field [0001] The invention belongs to the technical field of waterborne polyurethane coating resin, and in particular relates to an insulating waterborne polyurethane dispersion and its preparation method and application. Background technique [0002] Insulating coatings are based on high molecular polymers, which are cured into insulating films under certain conditions; they are used in the field of insulation due to their large resistivity, good heat resistance, strong mechanical properties and good resistance to heat and humidity; in industrial electrical construction , in order to protect electronic and electrical equipment from the surrounding moisture, dust, impact, etc., it is necessary to brush insulating paint on the surface of electronic and electrical equipment, such as printed circuit boards, which are circuit boards formed by conductors such as copper on plastic boards and other substrates. A layer of insulating paint needs to be painted on it to encap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/69C08G18/68C08G18/32C08G18/12C09D175/14C09D5/25
CPCC08G18/0823C08G18/12C08G18/68C08G18/698C08G18/765C09D5/00C09D175/14C08G18/3234C08G18/3228C08G18/3231
Inventor 孙东成罗鸟梅
Owner SOUTH CHINA UNIV OF TECH