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Polyurethane waterproof coating for building exterior walls and preparation method of polyurethane waterproof coating

A polyurethane waterproofing, building exterior wall technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of environmental and human health hazards, high construction environment requirements, and paint films are prone to defects, and achieve high stability. , the preparation method is simple and easy to operate, the effect of high bond strength and waterproof effect

Inactive Publication Date: 2019-09-10
FOSHAN SHUNDE HESHENG CHEMICAL INDUSTRIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyurethane coatings in the prior art generally have complicated construction procedures and high requirements on the construction environment, and the paint film is prone to disadvantages
[0003] In the prior art, since the waterproof coating contains volatile substances and air pollutants, it is harmful to the environment and human health, and the coating used for the exterior wall of the building needs to withstand the test of the environment. Therefore, it is necessary to improve the polyurethane used for the exterior wall of the building. The safety, environmental protection and weather resistance of waterproof coatings are of great significance

Method used

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  • Polyurethane waterproof coating for building exterior walls and preparation method of polyurethane waterproof coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A polyurethane waterproof coating for building exterior walls, made of components A and B:

[0027] Component A is made of modified polyester polyol and diisocyanate, and the mass fraction of -NCO is 5%;

[0028] Component B consists of the following raw materials in parts by weight: 20 parts of polyurethane resin, 4 parts of pigment and filler, 1 part of catalyst, 1 part of defoamer, and 1 part of leveling agent. The average molecular weight of the modified polyester polyol is 1000, and the ratio of component A to component B is 20:13.

[0029] Wherein, the pigments and fillers include the following components according to mass percentage: 8% light calcium, 25% heavy calcium, 40% talcum powder, 15% organic montmorillonite, 12% silica powder, and the sum of the components is 100%. The catalyst is tin octoate; the defoamer is polysiloxane series defoamer; the leveling agent is polyether modified polydimethylsiloxane.

[0030] A method for preparing a polyurethane water...

Embodiment 2

[0038] A polyurethane waterproof coating for building exterior walls, made of components A and B:

[0039] Component A is made of modified polyester polyol and diisocyanate, and the mass fraction of -NCO is 15%;

[0040] Component B is made up of the following raw materials in parts by weight: 30 parts of polyurethane resins, 18 parts of pigments and fillers, 3 parts of catalysts, 3 parts of defoamers, and 10 parts of leveling agents. The average molecular weight of the modified polyester polyol is 5000, and the ratio of component A to component B is 30:40.

[0041] Wherein, the pigments and fillers include the following components according to mass percentage: 20% light calcium, 25% heavy calcium, 40% talcum powder, 3% organic montmorillonite, 12% silica powder, and the sum of the components is 100%. The catalyst is one or more compounds selected from tin octoate, tin acetylacetonate and tin naphthenate; the defoamer is a polysiloxane series defoamer; the leveling agent is p...

Embodiment 3

[0049] A polyurethane waterproof coating for building exterior walls, made of components A and B:

[0050] Component A is made of modified polyester polyol and diisocyanate, and the mass fraction of -NCO is 8%;

[0051] Component B is made up of the following raw materials in parts by weight: 25 parts of polyurethane resins, 11 parts of pigments and fillers, 2 parts of catalysts, 2 parts of defoamers, and 6 parts of leveling agents. The average molecular weight of the modified polyester polyol is 2500, and the ratio of component A to component B is 25:21.

[0052] Wherein, the pigments and fillers include the following components according to mass percentage: 18% light calcium, 18% heavy calcium, 40% talcum powder, 12% organic montmorillonite, 12% silica powder, and the sum of the components is 100%. The catalyst is a compound of tin acetylacetonate and tin naphthenate; the defoamer is polysiloxane series defoamer; the leveling agent is polyether modified polydimethylsiloxane...

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Abstract

The invention discloses a polyurethane waterproof coating for building exterior walls. A component A is prepared from modified polyester polyol and diisocyanate, and the mass fraction of -NCO is 5-15%; and a component B is composed of the following raw materials in parts by weight: 20-30 parts of polyurethane resin, 4-18 parts of a pigment and filler, 1-3 parts of a catalyst, 1-3 parts of a defoaming agent and 1-10 parts of a flatting agent, wherein the average molecular weight of the modified polyester polyol is 1000-5000. The preparation method of the polyurethane waterproof coating is simple. Through combination of the components and process, stability of the coating is high, the coating has better water resistance, and the coating exhibits relatively high bonding strength and waterproof effects when being applied to exterior walls of buildings.

Description

technical field [0001] The invention relates to the field of polyurethane coating preparation, in particular to a polyurethane waterproof coating for building exterior walls and a preparation method thereof. Background technique [0002] Paint is a chemical mixture that can firmly cover the surface of objects for protection, decoration, marking and other special purposes. Polyurethane coatings are currently the most common type of coatings, which can be divided into two-component polyurethane coatings and one-component polyurethane coatings. Two-component polyurethane coatings are generally composed of isocyanate prepolymer and hydroxyl resin. According to the different hydroxyl components, they can be divided into acrylic polyurethane, alkyd polyurethane, polyester polyurethane, polyether polyurethane, epoxy polyurethane and other varieties. . Generally, they have good mechanical properties, high solid content, and good performance in all aspects. Two-component polyureth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C09D175/04C09D7/61C09D7/62
CPCC08K2003/265C08K2201/014C08L2205/02C08L2205/035C09D175/06C09D7/61C09D7/62C08L75/04C08K13/06C08K3/26C08K3/34C08K3/36
Inventor 陆浩然钟标何锦华
Owner FOSHAN SHUNDE HESHENG CHEMICAL INDUSTRIAL CO LTD