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Low-viscosity solvent-free polyurea coating as well as preparation method and application thereof

A solvent-free, low-viscosity technology, applied in anti-corrosion coatings, coatings, etc., can solve the problem of high VOC emissions, achieve the effects of reducing construction time, improving appearance decoration, and improving anti-corrosion performance

Pending Publication Date: 2021-07-16
北京碧海云智新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing polyaspartate polyurea coatings have the problem of high VOC emissions

Method used

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  • Low-viscosity solvent-free polyurea coating as well as preparation method and application thereof
  • Low-viscosity solvent-free polyurea coating as well as preparation method and application thereof
  • Low-viscosity solvent-free polyurea coating as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0067] The present invention also provides a preparation method of the low-viscosity solvent-free polyurea coating described in the above technical scheme, comprising the following steps:

[0068] Mix polyaspartic acid ester resin, silane resin, pigments and fillers and additives to obtain component A;

[0069] Provide polyisocyanate curing agent to obtain B component.

[0070] The invention mixes polyaspartic acid ester resin, silane resin, pigments and fillers and additives to obtain component A.

[0071] In the present invention, it is preferred to add silane resin, composite anti-rust pigment, pigments and fillers and additives to the polyaspartic acid ester resin under stirring, then grind to a fineness of less than 30 μm, and the temperature reaches 45-65° C. to obtain the A components.

[0072] In the present invention, the viscosity of the component A is preferably 100-120KU.

[0073] The invention provides a polyisocyanate curing agent to obtain the B component.

...

Embodiment 1～6

[0085] The low-viscosity solvent-free polyurea coating in embodiment 1~6 among the present invention realizes by following production process:

[0086] Component A: Add polyaspartic acid ester resin, add silane resin, molecular sieve water remover, rheology agent, wetting and dispersing agent, leveling agent, composite antirust pigment and pigment filler during stirring; grind to a fineness of less than 30 μm , the temperature reached 65°C, and kept for 20 minutes; added light stabilizer, UV absorber, and mixed evenly.

[0087] B component: polyisocyanate.

[0088] Before use, mix component A and component B according to the weight ratio shown in Table 1 to prepare the low-viscosity solvent-free polyurea coating of the present invention.

[0089] The compositions, physical parameters and film properties of the low-viscosity solvent-free polyurea coatings provided in Examples 1-6 are shown in Table 1.

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Abstract

The invention provides low-viscosity solvent-free polyurea coating as well as a preparation method and application thereof, and belongs to the technical field of anticorrosive coating. The coating comprises a component A and a component B which are independently subpackaged; the component A comprises the following components in parts by mass: 20-45 parts of polyaspartic acid ester resin, 2-6 parts of silane resin, 15-45 parts of pigment filler and 1.5-5.5 parts of an auxiliary agent; the component B comprises 15-35 parts of a polyisocyanate curing agent, and the mass ratio of the component A to the component B is (2.5-3.8): 1. The polyurea coating comprises the polyaspartic acid ester resin, the silane resin, the polyisocyanate curing agent, the pigment filler and the auxiliary agent with specific content, and the appearance decoration of the coating can be improved by adding the auxiliary agent; due to perfect matching of the specific components and component contents, the low-viscosity solvent-free polyurea coating provided by the invention has excellent mechanical property, corrosion resistance and decoration performance, and can obviously reduce VOC emission.

Description

technical field [0001] The invention relates to the technical field of anti-corrosion coatings, in particular to a low-viscosity solvent-free polyurea coating and a preparation method and application thereof. Background technique [0002] Polyaspartic ester polyurea is a new aliphatic, slow-response high-performance coating emerging in the polyurea industry. It is used as a protective coating with high weather resistance and chemical corrosion resistance, especially suitable for use as a top coat , can be directly applied to the metal surface. Aromatic and aliphatic polyureas have been used in many areas of corrosion protection, but the reaction rate is too fast due to the use of primary amines as raw materials. Polyaspartic acid ester is a kind of secondary amine with special molecular structure. The amino group in its structure is surrounded by steric hindrance. The reaction with the isocyanate component has a steric hindrance effect. This steric hindrance effect can be ...

Claims

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Application Information

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IPC IPC(8): C09D179/02C09D5/08C09D7/61C09D7/48C09D7/47
CPCC09D179/02C09D5/084C09D5/086C09D7/47C09D7/61C09D7/48C08K2003/387C08K2003/327C08L2201/08
Inventor 樊艳达谢静李依璇赵金庆霍振友何永敬盛庆南张家栋
Owner 北京碧海云智新材料技术有限公司
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