A kind of polyvinylidene chloride anti-rust water-based coating and its preparation process

Abstract

The invention relates to a polyvinylidene chloride rust-turning rustproof water-based paint and a preparation technology thereof and belongs to the technical field of chemical coatings. The polyvinylidene chloride rust-turning rustproof water-based paint is characterized by comprising the following components in parts by weight: 50-75 parts of polyvinylidene chloride emulsion, 3-15 parts of modified emulsion, 2.0-5.0 parts of auxiliaries, 0.1-0.5 part of organic silicon flatting agent, 0.1-0.5 part of mineral oil de-foaming agent, 3.0-20 parts of rust-turning agent and 0.5-2.0 parts of chloride ion inhibitor. The processing steps are as follows: adding polyvinylidene chloride emulsion, modified emulsion and auxiliaries at mass ratio into a preparation container and stirring; adding rust-turning agent solution and chloride ion inhibitor solution; continuing to stir after solution is fully added, and then filtering. The invention provides a physically modified universal PVDC emulsion anda technical method. The modified emulsion completely has the basic performance of metallic paint, namely, excellent rustproof performance, and is especially suitable for preparing a rust-turning rustproof water-based paint.

Description

technical field [0001] The invention discloses a polyvinylidene chloride rust-converting and antirust water-based paint and a preparation process thereof, which belong to the technical field of chemical paints. Background technique [0002] Polyvinylidene chloride (PVDC) emulsion is obtained by copolymerizing vinylidene chloride (VDC) with a small amount (15% to 20%) of vinyl chloride, acrylonitrile, acrylate, methacrylate, styrene and other monomers to obtain two Primary or ternary copolymers can be used as coatings, adhesives, etc. [0003] PVDC is a kind of plastic with high barrier properties, strong toughness, low-temperature heat sealing, good heat shrinkage and chemical stability, especially its moisture resistance, oxygen resistance, acid resistance, alkali resistance and oil immersion resistance. And resistance to a variety of chemical solvents and other properties, it has been widely used in the packaging of food, medicine, and military products for 50 years. The...

AI Technical Summary

Problems solved by technology

[0016] When the inventors studied PVDC metal coatings, they found that whether it is foreign metal-specific or domestic PVDC emulsions, the coating films produced have high chemical resistance, high adhesion, and high barrier properties. At the same time, the emulsions contain Cl - These characteristics are not conducive to the preparation of rust-reversing coatings. Rust-reversing coatings require high encapsulation of rust-reversing agents, inhibitors, and rust substances. And compatibility, the continuity and integrity of the coating film cannot be affected by the presence of these substances, but it is found in the test that pure PVDC emulsion film formation often causes microscopic defects due to the entry of foreign matter

This explains why PVDC emulsions have very good barrier properties when applied to packaging plastic films, but not to metal