Two-component polyurethane adhesive and preparation method and application thereof

Abstract

The invention discloses a two-component polyurethane adhesive and a preparation method and application thereof, and relates to the field of adhesives to solve problems of existing two-component polyurethane adhesives such as environmental pollution, high cost and the like. The product includes a main agent and a curing agent. The mass ratio of the main agent to the curing agent is 3-5:1. The mainagent comprises the following raw materials (by weight): 10-30 parts of polyether polyol, 10-20 parts of polyester polyol, 1-5 parts of a stabilizing agent, 1-5 parts of a catalyst, 40-80 parts of aninorganic filler, 5-10 parts of a diluent and 2-5 parts of a foaming agent. The curing agent is an isocyanate prepolymer. No special raw material or special production process is adopted for preparation of the product, and the production cost of the product is low. The sizing technology of the product is simple and energy-saving, and the use cost is low. In the application process, there is no need to carrying out surface treatment on WPC and PVC base material. The product has a stable bonding effect on WPC and PVC, and has excellent environmental friendliness.

Description

technical field [0001] The invention relates to the field of adhesives, in particular to a two-component polyurethane adhesive. Background technique [0002] In recent years, PVC and WPC / SPC composite indoor flooring have become popular in European and American markets due to their environmental performance and advantages of glue-free installation. The domestic market for similar products has also begun to develop rapidly. See Mingming. Due to the need to use PE wax release agent in the production process of wood plastic (WPC), the surface energy of WPC material is reduced or the surface energy of WPC sheet is uneven, which brings certain difficulties to the bonding of PVC and WPC. The most commonly used adhesive for PVC / WPC composite bonding is one-component moisture-curing polyurethane hot-melt adhesive (PUR, referred to as polyurethane hot-melt adhesive). Process conditions have disadvantages such as high energy consumption (constant temperature and humidity required), ...

AI Technical Summary

Problems solved by technology

Due to the need to use PE wax release agent in the production process of wood plastic (WPC), the surface energy of WPC material is reduced or the surface energy of WPC sheet is uneven, which brings certain difficulties to the bonding of PVC and WPC

The most commonly used adhesive for PVC / WPC composite bonding is one-component moisture-curing polyurethane hot-melt adhesive (PUR, referred to as polyurethane hot-melt adhesive). Disadvantages of process conditions such as high energy consumption (requires constant temperature and humidity), low isocyanate index (NCO index) and physical bonding lead to unstable bonding effect, etc.

[0003] The alternative product of polyurethane hot melt adhesive is two-component polyurethane adhesive. The bonding effect of two-component polyurethane adhesive to WPC usually depends on the degree of surface treatment of WPC substrate. There is always adhesion to unpolished WPC board Disadvantages such as unstable effect, failure of colloidal adhesion, too much glue per unit area, etc.

[0004] Although the existing solvent-based two-component polyurethane adhesives in the market have improved the bonding effect of PVC and WPC to a certain extent, the solvents used in them have the effects of polluting the environment, irritating odors and endangering health, and low volatilization efficiency in winter leading to adhesion The strength of the main body of the agent is reduced, and the degree of swelling and damage to the rubber roller of the equipment is high, so the market share has been low

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