Solvent-free polyurethane floor paint and preparation method thereof

Abstract

The invention discloses solvent-free polyurethane floor paint, which is prepared from main paint and a curing agent, wherein the curing agent is a polyol-modified isocyanate obtained by adding 20-40 parts of polyol and 70-80 parts of isocyanate for carrying out a reaction; the main paint is prepared from 40-60 parts of hydroxyl-terminated resin, 0.1-0.4 part of defoaming agent, 0.1-0.2 part of flatting agent, 0.1-0.4 part of a dispersing agent, 0.1-0.3 part of an anti-settling agent, 30-40 parts of pigment filler, and 5-10 parts of a chain extender; the invention also discloses a preparation method of the solvent-free polyurethane floor paint. The polyether polyol modified isocyanate is used as the curing agent, so that the low temperature flexibility of a paint film is increased, but thehardness of the paint film is not affected, and the paint can pass a bending test at the low temperature of -30 DEG C; furthermore, by controlling the contents of all the components in the main paint,the gelation time of the paint film can reach 40-70 minutes after the main paint is compounded with the curing agent, so that the construction operation time is long, and the application range is broadened; furthermore, the waste of raw materials is reduced, and the construction cost is lowered.

Description

technical field [0001] The invention relates to the technical field of floor coatings, in particular to a solvent-free polyurethane floor paint and a preparation method thereof. Background technique [0002] Flooring materials refer to paving on the floor or other substrates and used as a material to protect the substrate. In the earliest days, most of them were paved with wooden boards, so they were called floor paint. With the continuous upgrading of science and technology, a variety of floor paints have appeared. Floor paint cannot fully express the overview of this type of coating system, so people prefer to call it floor paint later. Floor paint more appropriately demonstrates the diversity and functionality of modern floor materials. Now, the most mature and common floor paint on the market is epoxy floor paint, but epoxy materials are hard and brittle, and have poor weather resistance. In addition, the chemical chain of epoxy resin contains benzene rings, which are...

AI Technical Summary

Problems solved by technology

The physical and chemical properties of its abrasion resistance and weather resistance are comprehensive, and the paint film is relatively full. However, the curing agents used are small molecule curing agents such as HDI and IPDI aliphatic isocyanate. When compounded with the main paint, the reaction speed is too fast, and the gel The time is short, and the construction time left for the construction personnel is very short, which is likely to cause waste of raw materials, increase the construction cost, and is prone to problems such as severe foaming and cracking and brittleness at low temperature

[0004] The Chinese patent application number 201510814221.7 discloses a "solvent-free elastic polyurethane floor": the topcoat layer is composed of components A, B and C, in parts by weight: component A is: two 40-60 parts of cyclohexylmethane diisocyanate and 20-30 parts of glycerol; component B: 0-10 parts of p-tert-butylphenyl glycidyl ether...; component C: 10-15 parts of fatty amine and 0.5-1.0 parts of stannous octoate; in order to improve the reactivity of isocyanate and alcohols and promote the curing reaction, a stannous octoate metal catalyst is added, and the addition of the catalyst will affect the flexibility of the paint film, causing needles to appear inside and on the surface of the paint film. Pores and other problems, and as the reaction continues, the paint film will become harder and harder

Images