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Single component polyurea polyurethane coating and preparation method thereof

A polyurethane coating, one-component technology, applied in the direction of coating, can solve the problems of flammable and explosive, lack of flexible segments, unsuitable application, etc., to achieve good impact resistance and elongation, reduce the effect of risk

Inactive Publication Date: 2011-06-22
SHENZHEN POLYTECHNIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the shortcoming of this technology is that the small molecular fatty amine is similar to the chain extender in the system, and lacks the flexible segment, which reduces the impact resistance and other properties of the film-forming material, while the macromolecular fatty amine is Solid, when used in coating systems, organic solvents are usually added
Ketones are commonly used as capping agents for amines, and the above-mentioned Chinese patent application publication CN1189817A has adopted 3-methyl-2-butanone as a capping agent, but this capping agent is a flammable and explosive substance, which is not suitable for application. Therefore it is necessary to select or reduce the amount of ketones

Method used

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  • Single component polyurea polyurethane coating and preparation method thereof
  • Single component polyurea polyurethane coating and preparation method thereof
  • Single component polyurea polyurethane coating and preparation method thereof

Examples

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preparation example Construction

[0045] The preparation method of the one-component polyurea polyurethane coating according to the present invention comprises: preparing a blocked isocyanate-based prepolymer; preparing a blocked polyetheramine; carrying out the blocked isocyanate-based prepolymer and the blocked polyetheramine in proportion Mixing; adding calcium oxide and other optional substances (such as catalysts, fillers, additives, etc.) to make a one-component polyurea polyurethane coating.

[0046] Among them, the blocked isocyanate-based prepolymer can be prepared by a usual method. For example, it is possible initially to charge one or more polyisocyanate prepolymers, then to add the solvent and then to meter in the blocking agent with stirring. Stirring was continued until free isocyanate was no longer detectable. The solvent is distilled off to obtain a solvent-free blocked isocyanate prepolymer.

[0047] Among them, the blocked polyetheramine can be prepared by a common method. For example, on...

Embodiment 1-4

[0051] Examples 1-4 disclose the preparation of the blocked isocyanate-based prepolymers of the present invention.

Embodiment 1

[0053] According to the following steps, its structural formula is:

[0054]

[0055] The isocyanate prepolymer (TDI-trimethylolpropane) is blocked.

[0056] Under nitrogen protection, 87.3 grams of prepolymer (0.4 mol equivalent NCO) was added to a 500-ml flask, and then 60.5 grams of p-butylphenol (already dissolved in 100 grams of butyl acetate) and 0.01 grams of dilauric acid di Butyl tin catalyst, mixed well, then reacted at 85°C until no NCO could be detected. The solvent was distilled off under reduced pressure to obtain a blocked isocyanate-based prepolymer.

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Abstract

The invention provides a single component polyurea polyurethane coating and a preparation method thereof. The coating comprises isocyanate prepolymer which is capped by a phenol capping agent, capped polyether amine and calcium oxide. The preparation method comprises the following steps of: preparing the capped isocyanate prepolymer; preparing the capped polyether amine; mixing the capped isocyanate prepolymer and the capped polyether amine according to a ratio; and adding the calcium oxide to prepare the single component polyurea polyurethane coating. The coating has high storage stability, does not contain any solvent, does not release or hardly release CO2 gas, is quick in drying, high in adhesion, moisture resistant, water resistant and salt resistant, and can be used as a protective coating in the fields such as underground engineering, bridges, ports, ships and the like.

Description

technical field [0001] The invention relates to a closed polyurethane coating, in particular to a single-component polyurea type polyurethane coating and a preparation method thereof. Background technique [0002] Polyurethane coatings have excellent performance and moderate price, and are widely used in underground engineering, bridges, ports, ships and other fields. These areas have the characteristics of wet base surface and high ambient humidity, and moisture-cured polyurethane coatings are generally used. Moisture-curing polyurethane coatings can be divided into two-component and one-component coatings. Due to the limitation of the environment, the on-site preparation of two-component moisture-curing polyurethane coatings is inconvenient and easy to cause waste, while the performance of one-component moisture-curing polyurethane coatings is fixed and easy to use, which is an ideal coating for construction units. [0003] The solid content of the one-component moisture...

Claims

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Application Information

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IPC IPC(8): C09D175/02C09D7/12
Inventor 林峰张武英徐玲叶卫王书元
Owner SHENZHEN POLYTECHNIC
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