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A sprayable waterproof and breathable two-component polyurethane waterproof coating and preparation method thereof

A two-component polyurethane and waterproof coating technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of affecting the waterproof performance of the coating film, affecting the appearance of the coating film, and bubbles on the surface of the coating film, so as to reduce the pores of the coating film Produce, take into account waterproof and breathable, good effect of free movement of chain segments

Active Publication Date: 2022-05-13
YUZHONGQING WATERPROOF MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual application process, with the increasing pressure of environmental protection and labor costs, higher requirements are put forward for the construction of polyurethane waterproof coatings, which are more affected by the construction environment (temperature and humidity, porous cement base surface, coating curing conditions, etc.) , Coating process, the influence of the coating itself, there may be various coating defects such as bubbles and bulges on the surface of the coating film. The appearance of these problems not only affects the appearance of the coating film, especially affects the waterproof performance of the coating film, shortening the service life of the material

Method used

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  • A sprayable waterproof and breathable two-component polyurethane waterproof coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation of component A of Example 1 (by mass parts) is as follows: Mix 54 parts of polyether diol DL4000D and 18 parts of polyether triol EP3600 evenly, heat up to 90-100°C while stirring, and keep the vacuum Dehydrate at -0.08~-0.09MPa for 1 hour, use a Karl Fischer moisture analyzer to detect that the moisture content is less than 0.05%, then cool down to 70~75°C (if the moisture content is not less than 0.05%, continue to dehydrate until the moisture content is less than 0.05%) One step), slowly add 6 parts of TDI-80 dropwise and react at 80-85°C for 2-3 hours, then cool down to 60°C and discharge to obtain component A;

[0023] The preparation of component B in Example 1 (by mass parts) is as follows: add 20 parts of polyether EP330N, 15 parts of chlorinated paraffin 52, 2.5 parts of DISPERBYK107, 6 parts of liquid chain extender ML-200, and add them into a multifunctional powerful dispersing mixer After stirring internally to raise the temperature to 80±5°C...

Embodiment 2

[0025] The preparation of component A of Example 2 (by mass parts) is as follows: Mix 57 parts of polyether diol DL4000D and 19 parts of polyether triol EP3600 evenly, heat up to 90-100°C while stirring, and keep the vacuum Dehydrate at -0.08~-0.09MPa for 1 hour, use a Karl Fischer moisture analyzer to detect that the moisture content is less than 0.05%, then cool down to 70~75°C (if the moisture content is not less than 0.05%, continue to dehydrate until the moisture content is less than 0.05%) One step), slowly add 8 parts of TDI-80 dropwise, react at 80-85°C for 2-3 hours, cool down to 60°C, and discharge to obtain component A;

[0026] The preparation of component B in Example 2 (in parts by mass) is as follows: 25 parts of polyether EP330N, 20 parts of chlorinated paraffin 52, 2.5 parts of DISPERBYK108, 8 parts of liquid chain extender ML-200, and added to a multifunctional powerful dispersing mixer After stirring internally to raise the temperature to 80±5°C, add 25 part...

Embodiment 3

[0028] The preparation of component A of Example 3 (by mass parts) is as follows: Mix 63 parts of polyether diol DL4000D and 21 parts of polyether triol EP3600 evenly, heat up to 90-100°C while stirring, and keep the vacuum Dehydrate at -0.08~-0.09MPa for 1 hour, use a Karl Fischer moisture analyzer to detect that the moisture content is less than 0.05%, then cool down to 70~75°C (if the moisture content is not less than 0.05%, continue to dehydrate until the moisture content is less than 0.05%) One step), slowly add 10 parts of TDI-80 dropwise and react at 80-85°C for 2-3 hours, then cool down to 60°C and discharge to obtain component A;

[0029]The preparation of component B of Example 3 (by mass parts) is as follows: add 25 parts of polyether EP330N, 15 parts of naphthenic oil, 3 parts of DISPERBYK111, and 10 parts of liquid chain extender ML-200 into a multifunctional powerful dispersing mixer Stir and heat up to 80±5°C, stir and add 30 parts of mica powder, 1.5 parts of i...

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Abstract

The invention discloses a sprayable waterproof and breathable two-component polyurethane waterproof coating and a preparation method thereof. Including isocyanate prepolymer (Part A) and curing agent reacting with isocyanate (Part B). The raw materials for preparing component A are high molecular weight polyether polyol and diisocyanate, whose viscosity at 25°C is less than 1200mpa.s. The raw materials for preparing component B are liquid chain extenders, polyether polyols, liquid fillers, inorganic porous fillers, additives, rheology control additives, etc. The viscosity at 25°C is less than 2500mpa.s, and the thixotropy is good , After A and B components are mixed in proportion, they can be sprayed under pressure. Through reasonable formula design, the prepared polyurethane waterproof coating can be sprayed and implemented, taking into account both waterproof and air permeability, and facilitates the discharge of internal gas and the like during construction on wet and porous base surfaces, and reduces the generation of pores in the coating film.

Description

technical field [0001] The invention relates to the field of two-component polyurethane waterproof coatings, in particular to a sprayable waterproof and breathable two-component polyurethane waterproof coating and a preparation method thereof. Background technique [0002] After curing, the two-component polyurethane coating is a rubber-like high-elastic coating film, which is widely used because of its excellent comprehensive performance. However, in the actual application process, with the increasing pressure of environmental protection and labor costs, higher requirements are put forward for the construction of polyurethane waterproof coatings, which are more affected by the construction environment (temperature and humidity, porous cement base surface, coating curing conditions, etc.) , Coating process, the influence of the coating itself, there may be various coating defects such as bubbles and bulges on the surface of the coating film. The appearance of these problems ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/08C09D7/65C09D7/61C09D7/63C08G18/66C08G18/48C08G18/32
CPCC09D175/08C09D7/65C09D7/61C09D7/63C09D7/70C08G18/6681C08G18/4812C08G18/3225C08K2003/2272C08L91/06C08K5/10C08K3/34C08K3/22C08K7/24C08K13/04
Inventor 李晴龙刘钊李宏伟田益
Owner YUZHONGQING WATERPROOF MATERIALS CO LTD
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