Preparation method of two-component waterborne polyurethane antistatic floor coating

Abstract

The invention discloses a preparation method of a two-component waterborne polyurethane antistatic floor coating. The coating is composed of a base coat and a face coat. A base coat component A is composed of polyether polyols polyurethane, filler, silver-plated conductive materials, conductive mica powder, an additive and the like. A face coat component A is composed of polyester polyol or polycarbonate glycol polyurethane, titanium dioxide, filler, silver-plated conductive materials, a polymer antistatic agent, an additive and the like. A curing agent component B is composed of polyether polyol and diisocyanate. The ratio of A to B is 1:0.3-0.7 (W / W). The antistatic floor coating obtained through the preparation method meets the technical requirements of GB / T 22374-2008, HG / T 3829-2006 and SJ / T 11294-2003 standards, has the excellent waterproof, weatherproof, anti-aging, acid and alkali resisting and oil contamination resisting performance and the excellent impact resistance, friction resistance and skid resistance, and meets the antistatic requirements of top-grade plants, hospitals, ultra-clean plants and the like.

Description

technical field [0001] The invention relates to a preparation method of an antistatic coating, in particular to a two-component waterborne polyurethane antistatic floor coating. Background technique [0002] Antistatic coatings are a group of special functional coatings with volume resistivity within a certain range. With the development of modern technology, some floors with clean and antistatic requirements, such as in electronic and electrical workshops, computer rooms, hospitals, printing factories, There are also more applications in textile factories and pharmaceutical factories, and antistatic floor coatings are more and more widely used. [0003] At present, almost all water-based antistatic floor coatings are water-based epoxy antistatic floor coatings, but they have the following defects: (1) Poor water resistance and cannot resist heavy underground moisture. It cannot be penetrated. If the concrete base of the ground floor on the first floor is not provided with ...

AI Technical Summary

Problems solved by technology

[0003] At present, almost all water-based antistatic floor coatings are water-based epoxy antistatic floor coatings, but they have the following defects: (1) Poor water resistance and cannot resist heavy underground moisture. It cannot be penetrated. If the concrete base of the ground floor on the first floor is not provided with a moisture-proof isolation layer, once the underground moisture is too heavy, it is easy to lift the epoxy floor coating, and a bulge will be formed in the early stage, and then it will crack and fall off. cloth with use

⑵ Low mechanical strength, poor scratch resistance, epoxy floor coating has poor scratch resistance to sand, iron filings and other sharp and hard objects

(3) Poor high temperature resistance. When the vehicle is driving too fast, once there is a sudden brake or a sharp turn, the epoxy floor coating will be softened due to the short-term high temperature due to sharp friction, and the dust on the vehicle tires will penetrate into it. The interior of the epoxy floor coating causes local scratches and discoloration of the epoxy floor coating. The only solution is partial repair

⑷The weather resistance and aging resistance are poor, and the epoxy resin floor has poor anti-ultraviolet ability, so it cannot be used outdoors for a long time, otherwise it will accelerate aging, such as discoloration, reduced strength, or even pulverization, delamination, etc.

[0004] According to conductive materials, there are conductive fiber floor paints, conductive mica powder floor paints, conductive metal powder floor paints, carbon black graphite and low molecular weight conductive additive floor paints: (1) Conductive fiber: has very High strength, very low oil absorption, good electrical conductivity, small amount of addition, and low cost; the disadvantage is that the control of resistance value is poor, which is easy to cause breakdown and damage, poor dispersion, and the distribution of coating resistance value is not good. uniform

(2) Conductive mica powder: good electrical conductivity, low specific gravity, low oil absorption, easy control of resistance value, can be very evenly dispersed in the coating, and the coating resistance value is uniform; the disadvantage is that the addition amount is large , the cost is higher than that of fiber

(3) Conductive metal powder: has good electrical conductivity; the disadvantage is high cost, darker color, can not be made into light color, too large specific gravity, easy to precipitate, poor dispersion, difficult construction, and easy to be oxidized

⑷Carbon black and graphite: have excellent electrical conductivity and low price; the disadvantage is that the color is dark, it cannot be made into a light color, and the oil absorption is too large to be made into a coating with a high solid content

⑸Low molecular weight conductive additives: low price, uniform dispersion; the disadvantage is that it is not resistant to migration, and the anti-static function has a short time limit, and it is only used for temporary anti-static places

In the past, antistatic floor coatings mostly used carbon-based fillers (graphite, carbon black and carbon fiber), metal-based fillers (silver, copper, nickel, zinc and iron alloys, etc.), metal oxides, etc. as the main conductive fillers. The color is dark, not easy to disperse, the electrical properties are unstable, the variety is single, the use is limited, and it is difficult to meet the decorative requirements of modern coatings