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Preparation method of polyurethane modified acrylate polymeric dispersant for coatings

A technology of polymer dispersant and polyurethane modification, which is applied in coating and other directions, can solve the problems of poor versatility, limited molecular weight and molecular structure, and achieve wide compatibility, simple preparation process and easy-to-obtain products Effect

Active Publication Date: 2015-12-02
KITO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most deflocculating dispersants are limited by molecular weight and molecular structure. Different dispersants need to be selected for different pigment particles and different polar systems, and the versatility is not strong.

Method used

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  • Preparation method of polyurethane modified acrylate polymeric dispersant for coatings
  • Preparation method of polyurethane modified acrylate polymeric dispersant for coatings
  • Preparation method of polyurethane modified acrylate polymeric dispersant for coatings

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preparation example Construction

[0034] The preparation method of the polyurethane-modified acrylate polymer dispersant for the coating of the present application comprises the following steps:

[0035] 1) Preparation of polyhydroxy acrylate

[0036] Add the solvent accounting for 50-150% of the total mass fraction into a four-necked flask equipped with a stirring and condensing device, at a temperature of 80°C to 160°C, a pressure of 0.01MPa to 1Mpa, and under the protection of nitrogen, the molar ratio of the dropwise addition is 1 : (0.01-0.1) mixture of hydroxyl-terminated acrylic monomers, acrylic monomers containing polar groups, and initiators accounting for 0.5-5% of the total mass of the reactants, dropwise for 2-5 hours, and keep warm for 1-5 hours. Cooling and filtering, spare;

[0037] 2) Polymer polyurethane synthesized from monoisocyanate

[0038] Weigh a certain mass of isocyanate multimer, monohydroxy polyether with a molar ratio of (2-6):1 to the isocyanate multimer, and a molar ratio to th...

Embodiment 1

[0053] Add 10g of monoisocyanate polyurethane C, 0.3428g of polyhydroxy acrylate A, 0.01g of dibutyltin dilaurate, and 2.586g of butyl acetate into a four-necked flask equipped with a stirring and condensing device, at a temperature of 90-100°C and Under the protection of nitrogen, stir for 3-5h, cool down and filter, the product has a solid content of 40%, and NCO%≤0.05%.

Embodiment 2

[0055] Add 10g of monoisocyanate polyurethane C, 0.4796g of polyhydroxy acrylate B, 0.01g of dibutyltin dilaurate, and 2.620g of butyl acetate into a four-necked flask equipped with a stirring and condensing device, at a temperature of 90-100°C and Under the protection of nitrogen, stir for 3-5h, cool down and filter, the product has a solid content of 40%, and NCO%≤0.05%.

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Abstract

The invention relates to a preparation method of a polyurethane modified acrylate polymeric dispersant for coatings. The preparation method comprises the following steps: preparing polyhydroxy acrylate, synthesizing polymeric polyurethane of mono-isocyanate, and modifying acrylate by virtue of polyurethane. The preparation method has the advantages that the preparation process is simple, products are easily available, and the generation of by-products is avoided; prepared polyurethane modified acrylate has various different polar segments and wide consistency, is applicable to various polar systems, does not influence the consistency of the systems, includes multiple pigment wetting groups and is capable of well dispersing various pigments, so that the tinting strength of the pigments is effectively improved, the viscosity of the systems is effectively decreased, and the pigment slurry has good storage stability and excellent surface dyeing resistance and floating performance.

Description

technical field [0001] The invention belongs to the field of fine chemical additives, and relates to the preparation of paint dispersants, in particular to the preparation of modified acrylates. Background technique [0002] In the process of paint application, in order to improve the surface decoration effect of the coating and improve the performance of the paint film, it is often necessary to add pigments. In order to make the powdery pigment uniformly and stably dispersed in the liquid coating system, it is necessary to add a dispersant and co-grind the pigment during the coating production process. The agent wets and adsorbs on the surface of the pigment, and stabilizes the pigment particles through steric hindrance and electric charge, thereby preparing a pigment paste with outstanding tinting strength and good stability. It can be seen that dispersant is an important part of preparing paint color paste. [0003] The paint dispersants in the prior art are classified ...

Claims

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Application Information

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IPC IPC(8): C09D7/12C08G18/62C08G18/48C08G18/42
Inventor 王文陶金铸
Owner KITO CHEM CO LTD
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