High-functionality hydroxyl-terminated polyurethane aqueous dispersion as well as preparation method and application thereof

A technology of hydroxyl-terminated polyurethane with high functionality, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problem of inability to guarantee the hydroxyl functionality of OH-PUD, unfavorable improvement of crosslinking degree of two-component coatings, OH-PUD Solve problems such as low solid content, achieve the effect of increasing the average hydroxyl functionality, high average hydroxyl functionality, and excellent yellowing resistance

Inactive Publication Date: 2017-06-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, DEA is a secondary amine, adding it to the prepolymer with ethylenediamine aqueous solution under high-speed stirring will make -NCO preferentially react with the primary amine in ethylenediamine, and DEA cannot completely react with -NCO, so there is no guarantee The hydroxyl functionality of OH-PUD is greater than 2, which affects the final coating film performance; on the other hand, the hydroxyl functionality of DEA is low, resulting in low hydroxyl functionality of OH-PUD, which is not conducive to the improvement of the crosslinking degree of two-component coatings , so that the mechanical strength and durability of the coating still need to be improved
In addition, the N-methylpyrrolidone solution of dimethylolpropionic acid is mostly used in the current aqueous dispersion of hydroxyl-terminated polyurethane as the hydrophilic chain extender. Not only the solvent is harmful to human health, but the solid content of the prepared OH-PUD is also low Low

Method used

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  • High-functionality hydroxyl-terminated polyurethane aqueous dispersion as well as preparation method and application thereof
  • High-functionality hydroxyl-terminated polyurethane aqueous dispersion as well as preparation method and application thereof
  • High-functionality hydroxyl-terminated polyurethane aqueous dispersion as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] (1) Preparation of hydroxyl-terminated polyurethane aqueous dispersion

[0042] The type and mass percentage of each component raw material:

[0043]

[0044] Preparation process: polycaprolactone diol (molecular weight 2000), isophorone diisocyanate (IPDI), sulfonic acid polyester diol, dimethylol propionic acid, silver catalyst and acetone (accounting for acetone in the formula The mass percentage of 20%) was added to the reactor, and the temperature was raised to 75°C for 3.5 hours under nitrogen protection. When the NCO% of the system reached the theoretical value, the temperature was lowered to 65°C, and 1,4-butanediol and The solution of trimethylolpropane in acetone (accounting for 30% of the mass percentage of acetone in the formula) was reacted at 70°C for 1.5h. ), cooling to 40°C, adding triethylamine to neutralize, adding water to disperse under high-speed shearing (accounting for the consumption of 90% water in the mass percentage of water in the formula...

Embodiment 2

[0054] (1) Preparation of hydroxyl-terminated polyurethane aqueous dispersion

[0055] The type and mass percentage of each component raw material:

[0056]

[0057] Preparation process: polytetrahydrofuran ether diol (molecular weight 2000), hexamethylene diisocyanate (HDI), sulfonic acid polyester diol, dimethylol butyric acid, silver catalyst and acetone (accounting for 20% by mass of acetone in the formula) %) into the reactor, under the protection of nitrogen, the temperature was raised to 80°C for 3 hours, and when the NCO% of the system reached the theoretical value, the temperature was lowered to 65°C, and 1,4-butanediol and trimethylolpropane were added dropwise within 40 minutes A solution of acetone (accounting for 30% of the mass percent of acetone in the formula) was reacted at 75°C for 1.5h. When the NCO% of the system reached the theoretical value, an appropriate amount of acetone was added for dilution (accounting for 50% of the mass percent of acetone in th...

Embodiment 3

[0065] (1) Preparation of hydroxyl-terminated polyurethane aqueous dispersion

[0066] The type and mass percentage of each component raw material:

[0067]

[0068] Preparation process: polycaprolactone diol (molecular weight 2000, molecular weight 1000), dicyclohexylmethane diisocyanate (HMDI), sulfonic acid type polyester diol, silver catalyst and a small amount of acetone (accounting for the mass percentage of acetone in the formula 20%) into the reaction kettle, under the protection of nitrogen, the temperature was raised to 80°C for 4 hours, and when the NCO% of the system reached the theoretical value, the temperature was lowered to 70°C, and 1,4-butanediol and trimethylol were added dropwise within 25 minutes Propane in acetone (accounting for 30% of the mass percent of acetone in the formula) solution, reacted at 75°C for 1.0h, and when the NCO% of the system reached the theoretical value, add an appropriate amount of acetone for dilution (accounting for 50% of the...

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Abstract

The invention discloses a high-functionality hydroxyl-terminated polyurethane aqueous dispersion as well as a preparation method and application thereof. The preparation method comprises the following steps: adding aliphatic diisocyanate, polyvalent alcohol, a hydrophilic chain-extending agent and a catalyst into a reaction kettle; carrying out temperature rise reaction under the protection of nitrogen gas and cooling when the NCO percent of a system reaches a theoretical value; dropwise adding an acetone solution of a dihydric alcohol chain-extending agent and a crosslinking agent, continuously reacting and diluting with acetone when the NCO percent of the system reaches the theoretical value; cooling, and adding triethylamine for neutralizing; adding water for dispersing, and adding alcamines compounds for terminating; finally, carrying out post chain extending by using ethidene diamine to obtain the hydroxyl-terminated polyurethane aqueous dispersion. According to the high-functionality hydroxyl-terminated polyurethane aqueous dispersion disclosed by the invention, an alcamines terminating agent with polyhydroxy functionality is adopted, and a polyhydroxy functional group is introduced on a polyurethane chain segment by a terminating reaction of an amine group and an NCO group; the obtained aqueous dispersion has the advantages of high solid content, small particle size and stable storage; a two-component waterborne polyurethane coating prepared by the high-functionality hydroxyl-terminated polyurethane terminating dispersion has the characteristics of high drying speed of the coating, excellent medium resistance and environment friendliness of a product.

Description

technical field [0001] The invention relates to an aqueous dispersion of hydroxyl-terminated polyurethane, more particularly to a high-functionality aqueous dispersion of hydroxyl-terminated polyurethane for two-component waterborne polyurethane coatings and a preparation method thereof. Background technique [0002] At present, water-based coatings have become one of the development trends of global coatings. Waterborne coatings can be divided into one-component and two-component. One-component water-based coatings have low film hardness and poor medium resistance, which severely limit their development and application. The mechanical properties, medium resistance, weather resistance, and decorative appearance of two-component water-based coatings are comparable to those of two-component solvent-based coatings, and have gradually become the first choice for high-performance and environmentally friendly coatings. [0003] Two-component waterborne polyurethane (2K-WPU) is m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/32C08G18/34C08G18/42C08G18/44C08G18/48C09D175/06C09D175/08C09D175/04
CPCC08G18/6659C08G18/3206C08G18/3228C08G18/3278C08G18/3281C08G18/348C08G18/4202C08G18/4277C08G18/44C08G18/4833C08G18/4854C08G18/6607C08G18/6611C08G18/6618C08G18/6622C08G18/6625C08G18/664C08G18/6644C08G18/6651C08G18/6655C09D175/04C09D175/06C09D175/08
Inventor 瞿金清郭丽黄山
Owner SOUTH CHINA UNIV OF TECH
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