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Preparation method of dispersing agent for polyurethane coating

A polyurethane coating and dispersant technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of general anti-precipitation and dispersion effect of coatings, uneven dispersion of filler particles, general performance of dispersants, etc., and achieve excellent anti-flocculation. The effect of strong adsorption and adsorption, shortening the grinding process

Inactive Publication Date: 2020-10-27
安徽喜宝高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Various fillers are commonly used in coatings, such as pigments and fillers, to improve the performance of coatings. However, due to uneven dispersion of filler particles in coatings, easy aggregation, precipitation, etc., it will greatly reduce the quality of coatings. Therefore, it is necessary to use The role of dispersant to improve its stability
[0004] Dispersants are widely used in coating additives. However, the existing research on dispersants started very late, and the performance of dispersants prepared in the prior art is average, especially the anti-sedimentation and dispersion effects of coatings.

Method used

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  • Preparation method of dispersing agent for polyurethane coating

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preparation example Construction

[0033] A method for preparing a dispersant for polyurethane coatings, comprising the following steps:

[0034] (1) Add paraformaldehyde, methanol, hydroxyethylethylenediamine, and catalyst to the reaction kettle in sequence, stir evenly, then feed nitrogen into the reaction kettle, discharge the air in the reaction kettle, and then continue to fill in hydrogen, Increase the pressure in the reactor to above 1.65MPa;

[0035] Hydroxyethylethylenediamine:

[0036] Structural formula: C 4 h 12 N 2 O;

[0037] Molecular weight: 104.15;

[0038] Appearance: colorless or light yellow transparent viscous liquid;

[0039] Odor: slight ammonia odor;

[0040] Density: 1.03 g / mL at 25 ℃;

[0041] Vapor density: 3.6 (vs air);

[0042] Refractive index: n20 / D 1.485;

[0043] Melting point: -28 ℃;

[0044] Boiling point: 238-240 ℃ 752 mm Hg;

[0045] Viscosity (20°C): 141ma.s;

[0046] Solubility: Miscible with water, ethanol, toluene, slightly soluble in ether;

[0047] (2) He...

Embodiment 1

[0068] A method for preparing a dispersant for polyurethane coatings, comprising the following steps:

[0069] (1) Add paraformaldehyde, methanol, hydroxyethylethylenediamine, and catalyst to the reaction kettle in sequence, stir evenly, then feed nitrogen into the reaction kettle, discharge the air in the reaction kettle, and then continue to fill in hydrogen, Increase the temperature in the reactor to 1.65MPa, the molar ratio of paraformaldehyde, methanol, and hydroxyethylethylenediamine is 1:1:2; the mass ratio of the catalyst to hydroxyethylethylenediamine is 1:30. Described catalyst adopts platinum catalyst;

[0070] (2) Heating the inside of the above reaction kettle, and carrying out stirring reaction for 3 hours, the heating temperature in step (2) is 92°C;

[0071] (3) Keep monitoring the pressure in the reactor. When the pressure in the reactor is lower than 1.5MPa, continue to fill in hydrogen and increase the pressure to 1.65MPa. After the pressure in the reactor ...

Embodiment 2

[0074] A method for preparing a dispersant for polyurethane coatings, comprising the following steps:

[0075] (1) Add paraformaldehyde, methanol, hydroxyethylethylenediamine, and catalyst to the reaction kettle in sequence, stir evenly, then feed nitrogen into the reaction kettle, discharge the air in the reaction kettle, and then continue to fill in hydrogen, Increase the pressure in the reactor to 1.68MPa, the molar ratio of paraformaldehyde, methanol, and hydroxyethylethylenediamine is 1:1:2; the mass ratio of the catalyst to hydroxyethylethylenediamine is 1:35. Described catalyst adopts platinum catalyst;

[0076] (2) Heat the inside of the above reaction kettle, and carry out stirring reaction for 5 hours, and the heating temperature in step (2) is 95°C;

[0077] (3) Keep monitoring the pressure in the reactor. When the pressure in the reactor is lower than 1.5MPa, continue to fill in hydrogen and increase the pressure to 1.68MPa. After the pressure in the reactor no lo...

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Abstract

The invention discloses a preparation method of a dispersing agent for a polyurethane coating, and relates to the technical field of coating additives. The preparation method comprises the following steps of: (1) acquiring an initiator solution; (2) acquiring a reaction solution; (3) acquiring a dispersion liquid preparation body; and (4) adding isodecanol and oleylamine into the obtained dispersion liquid preparation body, performing heating to 70-75DEG C under the protection of nitrogen atmosphere, carrying out heat preservation and stirring for 2h, and then performing natural cooling to room temperature to obtain the product. The invention provides a preparation method of the dispersing agent for a polyurethane coating. Compared with a conventional dispersing agent, the dispersing agentdisclosed by the invention has a stronger surface adsorption effect on pigments and fillers, the wetting effect on pigment and filler particles can be obviously improved, the grinding process is shortened, the yield per unit time is increased, an excellent anti-flocculation effect is realized, and re-aggregation of dispersed particles can be prevented, the dispersing agent provided by the invention adopts a non-polar part to provide a three-dimensional barrier among filler particles, and the stability of the filler particles in a solvent system is realized by virtue of a space entropy effect.

Description

technical field [0001] The invention belongs to the technical field of paint additives, in particular to a method for preparing a dispersant for polyurethane paint. Background technique [0002] Coating additives, also known as paint auxiliary materials, are auxiliary materials for preparing coatings, which can improve the performance of coatings and promote the formation of coating films. There are many types, including driers, tougheners, emulsifiers, thickeners, pigment dispersants, defoamers, leveling agents, anti-skinning agents, matting agents, light stabilizers, anti-mold agents, antistatic agents (See plastic additives) etc. After years of development, there are many types of paint additives, and they play different roles in each stage of paint production. The manufacturing stage includes: initiator, dispersant, transesterification catalyst; the reaction process includes: defoamer, emulsifier, filter aid, etc.; the storage stage includes: anti-skinning agent, anti-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D7/61C09D7/63C09D7/65C08F120/06C08G12/40C08G12/06C08G59/40
CPCC08F120/06C08G12/06C08G12/40C08G59/4071C08K2003/2241C09D175/04C09D7/61C09D7/63C09D7/65C08L33/02C08K13/02C08K3/042C08K5/05C08K5/17C08K3/22
Inventor 李振飞
Owner 安徽喜宝高分子材料有限公司
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