Environment-friendly waterborne block copolymer dispersant and preparation method thereof

Abstract

An embodiment of the invention relates to an environment-friendly waterborne block copolymer dispersant and a preparation method thereof. The environment-friendly waterborne block copolymer dispersantis made from, by mass, 20-30% of a polymerization monomer, 5-10% of cyclic alkyl sultone, 5-10% of a long-chain alkyl monomer, 1-3% of polysiloxane, 1-3% of an initiator, 0.5-1% of an activator, 2-5%of a chain transfer agent, 1-3% of waterborne RAFT (reversible addition-fragmentation chain transfer polymerization) agent, 1-2% of a neutralizer, and 45-55% of deionized water. The environment-friendly waterborne block copolymer dispersant provided by an embodiment of the invention has the special structure block copolymer and allows characteristics of different homopolymers to be integrated, amorphism and elasticity of flexible block and crystallinity and rigidity of rigid block help pigment-filler and mineral powdery particles to dispersedly suspend in the solutions, such as a paint base,for long time, macroscopic separation can be prevented, secondary flocculation is avoided, and a prepared colored paint system has good storage stability and brighter color that lasts for long time.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of water-based dispersants, in particular to an environmentally friendly water-based block copolymer dispersant and a preparation method thereof. Background technique [0002] Dispersants are indispensable and the most widely used additives in the fields of coatings, inks, adhesives and color pastes. The efficiency and effectiveness of dispersants directly determine the performance of products. Taking coatings as an example, water-based coatings are rapidly developing and environmentally friendly products. Decorative aesthetics is an important performance, and storage and transportation are stable. In the material composition of the coating system, pigments and fillers are important components. The blending and mixing in the coating system needs to be assisted by additives such as dispersants. Whether the dispersion of pigments, fillers and mineral powders in the paint base is stab...

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Problems solved by technology

[0003] Most of the dispersants, because the lipophilic group in the small molecule surfactant has a weak binding force to the surface of the pigment particle with low polarity, it is easy to desorb from the surface of the pigment particle, resulting in the re-flocculation of pigment filler mineral powder and other particles. It leads to the failure of storage of finished paint; at the same time, the hydrophilic group cannot produce sufficient stabilizing effect, and when added to the water-based paint system, it is very easy to cause poor chemical resistance of the paint protective layer during use after construction, which seriously affects the use of the paint film life, so the pigment dispersion system is extremely difficult to exist stably

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