Process for preparing polyurethane/acrylic hybrid dispersions

A technology of acrylic and polyurethane, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of limited application, PU prepolymer dispersed in water, PUA hybrid dispersion performance is difficult to control, etc.

Inactive Publication Date: 2014-07-30
DOW GLOBAL TECH LLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the UV resistance and water whitening resistance of the above-mentioned NCO-free PU are still not satisfactory, which limits the application of this material in architectural coatings, especially in interior and exterior wall coatings. application
In addition, the molar ratio of the two reaction components, that is, isocyanate and polyol is equal to or less than 1:1, and there is no NCO residue in the prepared PU prepolymer, and people cannot control the molecular weight of the PU prepolymer by detecting the NCO content ,If the molecular weight of the PU prepolymer is too high, it is extremely difficult to disperse the PU prepolymer in water, and the performance of the PUA hybrid dispersion is difficult to control

Method used

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  • Process for preparing polyurethane/acrylic hybrid dispersions
  • Process for preparing polyurethane/acrylic hybrid dispersions
  • Process for preparing polyurethane/acrylic hybrid dispersions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Preparation of PUA Hybrid Dispersion

[0048] (1) 22.4g NOP (G1), 0.04g DBTDL, 22.0g MMA and 2.4g DMPA were added to the three-necked flask, and the flask was stirred and heated;

[0049] (2) when the temperature of reactant reaches 50 ℃, add 11.1 grams of ADI to the flask;

[0050] (3) this reaction is kept at 75 ℃ for 45 minutes;

[0051] (4) 3.3g HEMA was added to the flask, and the reaction was continued for 30 minutes at 80°C;

[0052] (5) Dissolve 3.8g DAAm and 1.9g ammonium hydroxide in 120g deionized water, add the solution to the flask, and stir at 80°C for 30 minutes;

[0053] (6) this reactant is cooled to 60 ℃, 8.0g BA is added to the flask;

[0054] (7) 0.15 g of TBHP solution and 0.3 g of TEPA were separately added to the flask, and the reaction was stirred at 60°C for 1 hour. In some cases, ADH can be added.

[0055] (8) Filter the dispersion with a 100-mesh filter cloth, and the product is denoted as the PUA hybrid dispersion of Example 1.

Embodiment 2

[0057] The procedure of Example 1 was followed, with the difference that NOP (G4) was used as the polyol in this sample.

Embodiment 3

[0059] The steps of Example 1 were repeated, except that the reaction conditions of step (3) were kept at 70° C. for 30 minutes.

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Abstract

The present invention provides a new process for making polyurethane / acrylic (PUA) hybrid dispersions, specifically, it relates to a chemical hybrid method for preparing stable, super durable and water whitening resistant PUA hybrid dispersions. The present invention further provides a PUA hybrid dispersion prepared according to the above process and a coating composition comprising the PUA hybrid dispersion.

Description

technical field [0001] The present invention relates to a new method for the preparation of polyurethane / acrylic (PUA) hybrid dispersions, in particular, the present invention relates to the preparation of stable and durable PUA hybrids with good water-whitening properties A chemical hybrid method for hybrid dispersions, and PUA hybrid dispersions prepared by this method. technical background [0002] In recent years, there has been a concerted effort to reduce atmospheric pollution caused by volatile solvents emitted during the painting process. Due to environmental concerns, the government has imposed strict regulations on volatile organic compounds (VOCs). Therefore, a major goal of the coatings industry is to minimize the use of organic solvents by formulating water-based coating compositions that provide a smooth, high-gloss appearance with benefits including resistance to acid rain. good physical properties. While solvent-based coatings offer many advantages, such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/36C08G18/10
CPCC08F290/067C08G18/10C08G18/36C08G18/672C08F220/14C08F220/58C08F220/20C08G18/0823C08G18/348C08F220/06C08L33/12C08L75/04C09D133/12C09D175/04
Inventor 张纪光郭守学王毓江冯少光蒋思媛王彩凤卢福军
Owner DOW GLOBAL TECH LLC
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