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Hydroxylated polyurethane water dispersoid for waterborne soft-feel coating and preparation method thereof

A technology of hydroxyl polyurethane and dispersion, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor chemical resistance and poor hand feeling, improve resistance and scratch resistance, improve resistance, and preparation process easy to control effects

Active Publication Date: 2011-04-06
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the existing one-component flexible water-based polyurethane dispersion is formed into a film, although it has a soft touch, the chemical resistance is poor; The one-component polyurethane system has good chemical resistance after film formation, but the hand feeling is poor; at present, the main film-forming substances of water-based soft-touch coatings are flexible polyurethane aqueous dispersions containing hydroxyl groups and high-molecular-weight soft one-component polyurethanes. The dispersion is mixed as a hydroxyl component, and then cross-linked and cured with a hydrophilic isocyanate curing agent to form a film, and the performance of the flexible hydroxyl-containing polyurethane aqueous dispersion has a great influence on the handle, mechanical properties and chemical resistance of the soft-touch coating. The balance between

Method used

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  • Hydroxylated polyurethane water dispersoid for waterborne soft-feel coating and preparation method thereof
  • Hydroxylated polyurethane water dispersoid for waterborne soft-feel coating and preparation method thereof
  • Hydroxylated polyurethane water dispersoid for waterborne soft-feel coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 prepares elastic polyester diol

[0024] Add 106 parts of diethylene glycol, 180 parts of 1,4-butanediol, 104 parts of neopentyl glycol and 461 parts of adipic acid in the reaction flask with heating device, stirrer, oil-water separator in 1000ml, The initial material was heated to 150°C within 1 hour and then gradually raised to 200°C-210°C within 5 hours under the nitrogen gas, and the condensation reaction was carried out at this temperature. When the acid value is less than 3mgKOH / g, the heating is stopped to obtain elastic polyester diol with a hydroxyl value of about 50mgKOH / g and a relative molecular mass of 1000g / mol, which is stored for future use.

Embodiment 2

[0025] Embodiment 2 prepares hydroxyl-containing polyurethane aqueous dispersion A1~A3

[0026] (1) Formula

[0027] The hydroxyl-containing polyurethane aqueous dispersion used for water-based soft-feeling coatings of the present invention comprises 15 to 25 parts by weight of polycarbonate diol, 15 to 25 parts by weight of elastic polyester diol, and 1 to 5 parts by weight of pentaerythritol , 2 to 5 parts by weight of carboxyl group-containing diols, 10 to 20 parts by weight of aliphatic or alicyclic isocyanate monomers, 0.1 to 1.0 parts by weight of catalysts and solvents are raw materials, and the hydroxyl group-containing polyurethane resin obtained by thermal polymerization, The water dispersion formed after neutralization into salt, self-emulsification, and solvent removal, the specific formula is shown in Table 1.

[0028] Table 1

[0029]

[0030] Note: The commercially available polycarbonate diols used in Table 1 are prepared from 1,5 pentanediol and 1,6 hexan...

Embodiment 3

[0040] Embodiment 3 prepares the hydroxyl-containing polyurethane aqueous dispersion M1~M3 for comparative use

[0041] (1) The formula is shown in Table 3

[0042] table 3

[0043]

[0044]

[0045] (2) Concrete preparation steps are as follows:

[0046] Except for using the formula in Table 3, the hydroxyl-containing polyurethane aqueous dispersions M1-M3 were prepared according to the steps in Example 1, and stored for future use.

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Abstract

The invention relates to a hydroxylated polyurethane water dispersoid for a waterborne soft-feel coating and a preparation method thereof. The hydroxylated polyurethane water dispersoid is the water dispersoid formed by the following steps of: taking the raw materials in parts by weight: 15 to 20 parts of polycarbonate diols, 15 to 25 parts of elastic 4-butanediol, 1 to 5 parts of pentaerythritol, 2 to 5 parts of hydroxylated dimethylolpropionic acid or dihydroxymethyl butyric acid, 10 to 20 parts of fatty group or alicyclic group isocyanates monomers and 0.1 to 1.0 part of catalysts and solvents; carrying out heating polymerization to obtain hydroxylated urethane resin; and then neutralizing a water dispersoid formed after salt forming, self emulsifying and the solvent removing, wherein the coating-4 viscosity change of the coating stored for 6 months is smaller than 5 percent. After the hydroxylated polyurethane water dispersoid prepared by the method is prepared into a double-ingredient waterborne soft-feel coating, better balance is obtained between the coating film soft feel and the coating film resistance on alcohol and contaminants, and the effect of the hydroxylated polyurethane water dispersoid is proved.

Description

technical field [0001] The present invention relates to a kind of hydroxyl-containing polyurethane aqueous dispersion used for water-based soft-touch coatings and a preparation method thereof, and its hydroxyl-containing polyurethane aqueous dispersion is particularly suitable for combining with a single-component aqueous polyurethane dispersion as the hydroxyl component of the water-based coating. Combined with a hydrophilic isocyanate curing agent, it can be used as a protective and decorative water-based soft-feel coating for polyethylene, polystyrene, ABS and other plastic structures. Background technique [0002] Soft-touch coatings can form a coating film with elastic touch, matte appearance, good chemical resistance, abrasion resistance and anti-fogging properties. It is mainly used in the field of automotive interior parts and mobile phone casings, notebooks Electronic and electrical fields such as computer casings. Traditional solvent-based soft-touch coatings are ...

Claims

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Application Information

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IPC IPC(8): C08J3/03C08L75/04C08L75/06C08G18/66C08G18/44C08G18/42C08G18/32C09D175/04C09D175/06
Inventor 胡中祝宝英庄振宇朱柯张汉青
Owner CHINA NAT OFFSHORE OIL CORP
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