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Polyurethane waterproof coating and application thereof

A polyurethane waterproof, polyurethane prepolymer technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve problems such as flow, and achieve the effects of mild reaction, good thixotropy, and regular and dense molecular structure

Active Publication Date: 2021-06-04
JIANGSU CANLON BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the temperature in most areas in China is generally high in summer, and the temperature of the grassroots on site can reach above 50°C after being exposed to the sun.

Method used

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  • Polyurethane waterproof coating and application thereof
  • Polyurethane waterproof coating and application thereof
  • Polyurethane waterproof coating and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] This example provides the secondary amine compound of structure shown in a kind of formula (I-1):

[0059]

[0060] Its preparation method comprises the following steps:

[0061] (a) make phenol (1mol), mass fraction be that 37% formaldehyde aqueous solution (containing formaldehyde 2mol), alkaline earth metal magnesium type catalyst 0.05mol (being made of magnesium hydroxide and magnesium oxide that feed molar ratio is 1: 1) mixes, Raise the temperature to 60°C and react for 1h;

[0062] (b) in the reaction solution after step (a) reaction, add the isopropyl diamine (H) to be reacted 2 N-C(CH 3 ) 2 -NH 2 , 0.5mol), mixed, heated up to 120°C, reacted for 4h, then vacuum dehydrated, controlled moisture content below 500ppm, until a transparent viscous liquid product was obtained, and the compound shown in the formula (I-1) was prepared.

Embodiment 2

[0064] This example provides the secondary amine compound of structure shown in a kind of formula (I-2):

[0065]

[0066] Its preparation method comprises the following steps:

[0067] (a) make phenol (1mol), mass fraction be that 37% formaldehyde aqueous solution (containing formaldehyde 2mol), alkaline earth metal magnesium type catalyst 0.05mol (being made of magnesium hydroxide and magnesium oxide that feed molar ratio is 1: 1) mixes, Raise the temperature to 60°C and react for 1h;

[0068] (b) add 3-diaminopentane (H) to be reacted in the reaction solution after step (a) reaction 2 N-C (CH 2 CH 3 ) 2 -NH 2 , 0.5mol), mixed, heated up to 120°C, reacted for 4 hours, then vacuum dehydrated to control the water content below 500ppm until a transparent viscous liquid product was obtained, and the compound represented by the formula (I-1) was prepared.

Embodiment 3

[0070] This example provides the secondary amine compound of structure shown in a kind of formula (I-5):

[0071]

[0072] Its preparation method comprises the following steps:

[0073] (a) Mix phenol (1mol), benzaldehyde (2mol), and 0.05mol of an alkaline earth metal magnesium catalyst (consisting of magnesium hydroxide and magnesium oxide with a feed molar ratio of 1:1), heat up to 80°C, and react for 1h;

[0074] (b) in the reaction solution after step (a) reaction, add the isopropyl diamine (H) to be reacted 2 N-C(CH 3 ) 2 -NH 2 , 0.5mol), mixed, heated up to 120°C, reacted for 4h, then vacuum dehydrated, controlled moisture content below 500ppm, until a transparent viscous liquid product was obtained, and the compound shown in the formula (I-5) was prepared.

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Abstract

The invention discloses a polyurethane waterproof coating and application thereof; the polyurethane waterproof coating comprises a polyurethane prepolymer and an auxiliary agent; the raw materials of the polyurethane prepolymer comprise polyol, isocyanate and a secondary amine compound, the secondary amine compound is selected from one or a combination of more of compounds represented by formula (I); wherein R1 is branched chain alkylene; the R2 is H or C1-10 alkyl, or C1-10 alkyl substituted by one or more of C1-6 alkyl and C1-6 alkoxy, or phenyl; the polyurethane prepolymer is prepared by mixing and reacting polyol, a secondary amine compound and part of isocyanate and then adding the rest of isocyanate to react again; the waterproof coating is suitable for machine spraying on a high-temperature base layer, can give consideration to sagging resistance and viscosity balance, and is especially suitable for spraying construction on a base layer with the temperature of 50 DEG C or above.

Description

technical field [0001] The invention belongs to the field of building waterproofing, and in particular relates to the waterproofing construction with relatively high temperature for the building construction base and the facade or slope surface, in particular to a polyurethane waterproof coating and its application. Background technique [0002] Conventional polyurethane coatings are all non-environmentally friendly coatings containing solvents at present. During construction, the solvents volatilize. On the one hand, they have a strong smell, and on the other hand, they cause air pollution. Because the viscosity of the polyurethane prepolymer itself is high, the manufacturer must add fillers in order to reduce the cost, resulting in a higher viscosity of the coating itself. If no solvent is added, it is difficult to apply. At the same time, some large-scale projects in China, such as basement walls of large-scale system venues, high-speed railways, subways, tunnels, civil a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C08G18/66C08G18/48C08G18/32
CPCC09D175/08C08G18/6688C08G18/4812C08G18/3275
Inventor 贺小钢李忠人周围单永胜马世界王仁杰
Owner JIANGSU CANLON BUILDING MATERIALS
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