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Single-component polyurethane waterproof coating composition and preparation method thereof

A polyurethane waterproof, polyurethane prepolymer technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of slow hydrolysis, base surface peeling, and inability to meet the needs of use

Active Publication Date: 2021-11-12
KESHUN WATERPROOF TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the coating film formed by the current one-component polyurethane waterproof coating will slowly hydrolyze under the action of water vapor in the environment or under the condition of immersion in water, resulting in poor adhesion between the coating film and the substrate, and even bulging, cracking, and contact with the substrate. Peeling, can not meet the needs of underground high humidity or water immersion environment

Method used

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  • Single-component polyurethane waterproof coating composition and preparation method thereof
  • Single-component polyurethane waterproof coating composition and preparation method thereof
  • Single-component polyurethane waterproof coating composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0151] Add hydroxyl-terminated polybutadiene acrylonitrile, polyether polyol, and plasticizer into the strong disperser, gradually add pigments and fillers, and disperse evenly;

[0152] Transfer the dispersed slurry to the reactor, stir and heat up to 100~110°C, and dehydrate for 2~3 hours at a relative vacuum of -0.08~-0.1MPa;

[0153] Lower the temperature to 70-80°C, add a dispersant, then gradually add isocyanate, stir, then add the second catalyst, raise the temperature to 75-85°C, and react for 3-4 hours; control the rate of isocyanate addition to 1-2 parts by weight / s;

[0154] Keep warm at 75~85℃, add end-capping agent, and continue stirring for 2~3 hours;

[0155] Cool down to 50~60°C, add the first catalyst, and stir for 0.5~1 hour;

[0156] Cool down to below 50°C, fill with nitrogen for protection, and discharge to obtain a one-component polyurethane waterproof coating composition.

[0157] In the above preparation process, the hydroxyl-terminated polybutadien...

Embodiment 2

[0159] Repeat the preparation process described in Example 1, the change is:

[0160] The hydroxyl-terminated polybutadiene acrylonitrile used is 100 parts by weight, the polyether polyol is 70 parts by weight of polyether polyol EP330N, the dispersant is 40 parts by weight of butyl acetate, and the plasticizer is 26 parts by weight of Trioctyl phosphate, pigments and fillers are 60 parts by weight of nano calcium carbonate and 30 parts by weight of fumed silica, isocyanate is 55 parts by weight of TDI and 7 parts by weight of L-lysine triisocyanate, the second catalyst is 0.5 The amount of stannous octoate in parts by weight, the addition amount of the end-capping agent is 40 parts by weight, and the first catalyst is stannous octoate in 1 part by weight.

Embodiment 3

[0162] Repeat the preparation process described in Example 1, the change is:

[0163] The hydroxyl-terminated polybutadiene acrylonitrile used is 100 parts by weight, the polyether polyol is 50 parts by weight of polyether polyol EP330N, the dispersant is 35 parts by weight of butyl acetate, and the plasticizer is 25 parts by weight of Nonyl ester, pigments and fillers are 65 parts by weight of nano-calcium carbonate and 25 parts by weight of fumed silica, isocyanate is 55 parts by weight of 4,4'-dicyclohexylmethane diisocyanate (HMDI) and 5 parts by weight of L- Lysine triisocyanate, the second catalyst is 0.2 parts by weight of stannous octoate, the addition amount of the blocking agent is 30 parts by weight, and the first catalyst is 0.5 parts by weight of stannous octoate.

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Abstract

The invention belongs to the technical field of waterproof coatings, and provides a single-component polyurethane waterproof coating composition and a preparation method thereof. The single-component polyurethane waterproof coating composition comprises polyurethane film-forming resin, a dispersing agent and an optional additive; the polyurethane film-forming resin comprises a molecular chain skeleton of an isocyanate-terminated polyurethane prepolymer, the isocyanate-terminated polyurethane prepolymer is obtained through reaction of hydroxyl-terminated polybutadiene acrylonitrile, polyether polyol and isocyanate, the polyurethane film-forming resin comprises a chain segment structure which is connected with the molecular chain skeleton and is shown in the formula 1, and the formula 1 is shown in the description, wherein R1, R2, R3, R4, n and n' are defined in the description. A coating film formed by the single-component polyurethane waterproof coating composition has excellent water resistance.

Description

technical field [0001] The application belongs to the technical field of waterproof coatings, and in particular relates to a one-component polyurethane waterproof coating composition and a preparation method thereof. Background technique [0002] The polyurethane coating film has the characteristics of elasticity and good ductility, good adhesion, small volume shrinkage, no seams in the waterproof layer of the coating film, good resistance to expansion and deformation of the base layer, and easy construction. One-component polyurethane waterproof coatings are flourishing due to the advantages of low viscosity, low construction difficulty, long application period and stable performance. [0003] However, the coating film formed by the current one-component polyurethane waterproof coating will slowly hydrolyze under the action of water vapor in the environment or under the condition of immersion in water, resulting in poor adhesion between the coating film and the substrate, a...

Claims

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Application Information

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IPC IPC(8): C09D175/14C08G18/69C08G18/48C08G18/12
CPCC09D175/14C08G18/698C08G18/4829C08G18/12
Inventor 何宏林陈立义
Owner KESHUN WATERPROOF TECH CO LTD
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