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Organic silicon modified waterborne polyurethane waterproof coating and preparation method thereof

A water-based polyurethane and waterproof coating technology, applied in polyurea/polyurethane coatings, anti-corrosion coatings, anti-fouling/underwater coatings, etc., can solve the problems of poor mechanical properties, poor wear resistance and weather resistance, and poor storage stability of water-based polyurethane emulsion problem, to achieve the effect of good weather resistance, not easy to yellow, good elasticity and mechanical properties

Active Publication Date: 2020-11-27
INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technical defect of poor storage stability of water-based polyurethane emulsion restricts the application of water-based polyurethane emulsion
Moreover, since the molecular chain of waterborne polyurethane contains hydrophilic groups, the waterborne polyurethane coating has poor water resistance, water resistance, stain resistance, poor mechanical properties, wear resistance and weather resistance after film formation.

Method used

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  • Organic silicon modified waterborne polyurethane waterproof coating and preparation method thereof
  • Organic silicon modified waterborne polyurethane waterproof coating and preparation method thereof
  • Organic silicon modified waterborne polyurethane waterproof coating and preparation method thereof

Examples

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preparation example Construction

[0054] The present invention also provides the preparation method of the organosilicon-modified water-based polyurethane waterproof coating described in the above technical scheme, comprising the following steps:

[0055] (1) Dewatering polyether polyol and polycarbonate polyol to obtain a polyol mixture, the temperature of the dewatering is 100-120°C;

[0056] (2) After cooling the polyol mixed solution obtained in the step (1) to 50-60° C., polyisocyanate and catalyst are added in turn to carry out prepolymerization to obtain the first prepolymer; the temperature of the prepolymerization is 75 ~80°C;

[0057] (3) adding a hydrophilic chain extender and a non-hydrophilic chain extender sequentially to the first prepolymer obtained in the step (2) to carry out the chain extension reaction, and stop heating when the isocyanate index reaches 1.1 to 1.2 to obtain The second prepolymer; the temperature of the chain extension reaction is 75-80°C;

[0058] (4) The temperature of t...

Embodiment 1

[0080] The formula of organosilicon-modified waterborne polyurethane waterproof coating is as shown in table 1:

[0081] Table 1: The formula of preparation example 1 organosilicon-modified waterborne polyurethane waterproof coating

[0082]

[0083]

[0084] Preparation:

[0085] (1) Polyether polyol and polycarbonate polyol are placed in a reaction kettle, and water is removed in vacuum at 100°C for 2 hours to obtain a polyol mixture;

[0086] (2) After cooling the polyol mixture obtained in step (1) to 50°C, add polyisocyanate to the reaction kettle, then raise the temperature to 80°C, and keep it warm for 1 hour; then add the catalyst to the reaction kettle and keep it warm 3h, obtain the first prepolymer;

[0087] (3) Add a hydrophilic chain extender to the reactor and keep it warm at 80°C for 1 hour; then add a post-chain extender to the reactor and react at 80°C for 1 hour, and stop heating when the isocyanate index reaches 1.1 to 1.2 , to obtain the second pre...

Embodiment 2

[0142] The difference from Example 1 is that the mass ratio of N210 / PPCD is 3:2, and the other components and preparation methods are the same as in Example 1.

[0143] In this example, when the mass ratio of N210 / PPCD is 3:2, the test results of the properties of the emulsion and the film are shown in Table 2.

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Abstract

The invention relates to the technical field of waterproof coatings, and provides an organic silicon modified waterborne polyurethane waterproof coating, which is prepared from the following raw materials in parts by mass: 100 parts of polyhydric alcohols and polyisocyanates; 4-6 parts of a hydrophilic chain extender; 3-7 parts of a post-chain extender; 0.05 to 0.3 part of a neutralizing agent; 0.1 to 1.0 part of a neutralizing agent; 1.5 to 2 parts of a KH-550 coupling agent, 10 to 25 parts of an auxiliary agent, 20 to 50 parts of a filling material, and 25 to 40 parts of water; the present invention defines the isocyanate index during dosing, and defines the composition of the polyols. When the addition amount of the KH-550 coupling agent is 1.8%, the organosilicon modified waterborne polyurethane waterproof coating provided by the invention can ensure that the water absorption rate of an adhesive film is 4.7% under the condition of ensuring emulsion stability, and has excellent water resistance, stain resistance, mechanical properties, weather resistance, waterproofness, wear resistance and corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of waterproof coatings, in particular to an organosilicon-modified waterborne polyurethane waterproof coating and a preparation method thereof. Background technique [0002] At present, in the field of construction, there are mainly two types of coatings: one is oil-based coatings that use organic solvents as the medium or high-solid, solvent-free oily coatings; the other is water-based coatings that can be dissolved or dispersed in water. Water-based paint is a paint that uses water as a solvent or a dispersion medium. It only uses a small amount of low-toxic alcohol ether organic solvents, and the volatilization of organic solvents is reduced. It is a paint with low energy consumption and low pollution. Moreover, because it contains almost no organic volatile solvents, it avoids the flammability and volatile toxicity of organic solvents, making it less harmful to production personnel in production, and at ...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D5/08C09D5/16C09D7/63C09D7/61C08G18/75C08G18/66C08G18/48C08G18/44C08G18/40C08G18/12C08G18/34C08G18/32
CPCC08G18/12C08G18/4018C08G18/44C08G18/48C08G18/755C08G2150/90C08K2003/2227C08K2003/265C08K2201/011C09D5/08C09D5/1662C09D5/1687C09D175/04C08K13/02C08K5/544C08K3/36C08K3/22C08K3/26C08K3/34C08G18/348C08G18/3206
Inventor 曾国屏徐建国王刚王玲玲张军
Owner INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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