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A kind of polymer block dispersant and its preparation method and application

A dispersant and polymer technology, applied in the field of polymer dispersant synthesis, can solve the problems of poor steric hindrance effect and insufficient anchoring ability of the dispersant, and achieve the effects of high controllability, not easy to fall off, and reducing viscosity.

Active Publication Date: 2018-05-29
江苏宁龙高科新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to overcome the shortcomings of insufficient anchoring ability and poor steric hindrance effect of currently synthesized dispersants, the present invention provides a polymer block dispersant and its preparation method and application, which provide a larger steric hindrance effect and effectively Coated on the surface of the particles, forming a stretched state in an aqueous solvent, forming a strong steric hindrance to prevent particle agglomeration

Method used

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  • A kind of polymer block dispersant and its preparation method and application
  • A kind of polymer block dispersant and its preparation method and application
  • A kind of polymer block dispersant and its preparation method and application

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preparation example Construction

[0036] A kind of preparation method of polymer block dispersant provided by the invention comprises the following steps:

[0037]Step S1: Polymerize the monomer methacrylic acid, sodium styrene sulfonate, and N-isopropylacrylamide under the action of an initiator and a chain transfer agent to form a macromolecular chain transfer agent M-CTA, specifically, under nitrogen protection Next, the monomer methacrylic acid, sodium styrene sulfonate, and N-isopropylacrylamide were mixed evenly and added dropwise to a 250ml four-neck flask containing initiator, chain transfer agent and solvent, and the macromolecular chain was obtained after purification. Transfer agent M-CTA, in which the reaction temperature is 60-70°C, the monomer methacrylic acid, sodium styrene sulfonate, and N-isopropylacrylamide are mixed evenly, and the dropping time is 3-4 hours, and the temperature is kept for 3-5 hours , the solvent is at least one of N'N-dimethylformamide, dioxane, and tetrahydrofuran, where...

Embodiment 1

[0042] (1) Add 20ml solvent THF, 0.033g AIBN (2×10 -4 mol), 0.282g chain transfer agent BDATC (0.001mol), nitrogen gas flow, the reaction device was sealed, and the temperature was raised to 65°C.

[0043] (2) Mix 21.52g MAA (0.25mol), 51.55g SMAS (0.25mol), 28.3g NIPAM (0.25mol) and 80ml THF and add it dropwise to a four-necked flask for 3 hours. After the addition is complete, keep it at 65°C After 3h, distilled water was added dropwise to quench free radicals after the reaction was completed, and then the solvent was removed by vacuuming to obtain the macromolecular chain transfer agent M-CTA.

[0044] (3) Add 50ml DMF, 2.5g M-CTA (0.001mol) and 0.033g AIBN (2×10 -4 mol), nitrogen gas, after heating up to 70°C, start to drop the mixed solution of 25g APEG (molecular weight: 500g / mol) (0.05mol), 6.5g HEMA (0.05mol) and 50ml DMF, and the dropping time is 5h. The reaction was maintained for another 12 h until the end of the reaction, and cooled to room temperature.

[0045]...

Embodiment 2

[0047] (1) Add 30ml solvent THF, 0.033g AIBN (2×10 -4 mol), 0.282g chain transfer agent BDATC (0.001mol), nitrogen gas flow, the reaction device was sealed, and the temperature was raised to 70°C.

[0048] (2) Mix 17.21g MAA (0.2mol), 41.24g SMAS (0.2mol), 16.97g NIPAM (0.15mol) and 70ml THF and add it dropwise to a four-necked flask for 3 hours. After the addition is completed, keep it at 70°C After 3h, distilled water was added dropwise to quench free radicals after the reaction was completed, and then the solvent was removed by vacuuming to obtain the macromolecular chain transfer agent M-CTA.

[0049] (3) Add 55ml DMF, 4.7g M-CTA (0.001mol) and 0.033g AIBN (2×10 -4 mol), nitrogen gas, after heating up to 70°C, start to drop a mixed solution of 70g APEG (molecular weight: 700g / mol) (0.1mol), 6.5g HEMA (0.05mol) and 50ml DMF, and the dropping time is 5h. The reaction was maintained for another 12 h until the end of the reaction, and cooled to room temperature.

[0050] (4...

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Abstract

The invention provides a novel high-molecular-block dispersing agent, a preparation method and an application thereof. The preparation method includes the following steps: performing polymerization to a monomer methacrylic acid, sodium styrenesulfonate and N-isopropyl acrylamide under the effects of an initiator and a chain transfer agent to generate a large-molecular chain transfer agent M-CTA; and mixing the large-molecular chain transfer agent M-CTA with the initiator to initiate polymerization of hydroxyethyl methylacrylate and allyl alcohol polyoxyethylene ether as monomers to prepare the high-molecular-block dispersing agent. The high-molecular-block dispersing agent can be applied in dispersion of nano titanium dioxide, calcium carbonate, printing ink pigment particles and the like.

Description

technical field [0001] The invention belongs to the field of polymer dispersant synthesis, and in particular relates to a polymer block dispersant and its preparation method and application. Background technique [0002] The coating industry is a pillar industry of the construction industry. With the economic development in recent years, the demand for coatings in the national construction engineering and real estate industry has gradually increased. As people pay more attention to environmental protection and energy saving and emission reduction, organic coatings bring Therefore, it is particularly important to develop a polymer block dispersant that does not contain VOC and is stable to the dispersion of pigment particles. [0003] The polymer dispersant achieves dispersion and stability of inorganic pigment particles mainly through the following methods: [0004] (1) Electrostatic Stability Theory: Also known as DLVO theory, it is suitable for particle dispersion systems...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F293/00C08F212/14C08F220/06C08F220/54C08F220/28C08F216/14C09D7/65C09D11/03
CPCC08F212/14C08F293/00C09D7/65C09D11/03C08F220/06C08F220/54C08F220/281C08F216/1433
Inventor 姜益林吕飞
Owner 江苏宁龙高科新材料有限公司
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