Preparation method of single-ingredient sag-resistant polyurethane waterproof paint

A polyurethane waterproof and anti-sagging technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as uneven dispersion, poor fluidity, and implosion, and achieve stable performance, improved performance, and good dispersion.

Inactive Publication Date: 2019-02-12
JIANGSU CANLON BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome one or more deficiencies in the prior art, and to provide a preparation method of a one-component anti-sagging polyurethane waterproof coating, which can not only solve the problem of poor fluidity in the prior art and directly or Explosion, skinning, uneven dispersion and other problems caused indirectly, and the produced polyurethane waterproof coating can also have excellent anti-sag performance

Method used

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preparation example Construction

[0043] Based on the above problems, the present invention innovatively proposes the following technical solutions to solve the above problems: a method for preparing a one-component anti-sagging polyurethane waterproof coating, the preparation method comprising the following steps:

[0044] (1) Under the protection of an inert gas, mix the dehydrated polyether polyol with the first isocyanate and react to prepare a polyurethane prepolymer;

[0045] (2) Premix the polyurethane prepolymer prepared in step (1) with modified nano calcium carbonate, polyurea, modified nano gas phase silica and filler after dehydration respectively, and then add the first twin-screw extruder Mixing and dispersing in the machine, extruding to obtain a dispersing mixture, wherein the mixing and dispersing process is controlled to be carried out under a vacuum degree ≤ -0.085MPa, and the polyurea is made by the reaction of the second isocyanate and diamine;

[0046] (3) adding the dispersion compound p...

Embodiment 1

[0063] This embodiment provides a preparation method of a one-component anti-sag polyurethane waterproof coating, the raw materials of the one-component anti-sag polyurethane waterproof coating include 10 parts of polyether polyol 2000D, 5 parts of polyether polyol N330, poly 10 parts of ether polyol 3050, 6 parts of MDI-50, 18 parts of modified nano calcium carbonate, 3 parts of polyurea, 0.6 parts of modified nano fumed silica, 10 parts of diisononyl phthalate, heavy carbonic acid 20 parts of calcium, 6 parts of No. 200 solvent oil, 0.02 parts of polysiloxane defoamer, 0.1 part of pentamethyldipropylenetriamine and 11.28 parts of imine latent curing agent; the preparation method is as follows:

[0064] (1) Weigh each raw material according to the formula, add the formula amount of polyether polyol 2000D, polyether polyol N330 and polyether polyol 3050 into the dehydration kettle under the protection of inert gas, and heat up to 80°C while stirring Start vacuuming when the va...

Embodiment 2

[0072] This embodiment provides a preparation method of a one-component anti-sag polyurethane waterproof coating, the raw materials of the one-component anti-sag polyurethane waterproof coating include 8 parts of polyether polyol 2000D, 10 parts of polyether polyol N330, polyether polyol N330, poly 5 parts of ether polyol 3050, 8 parts of MDI-50, 18 parts of modified nano calcium carbonate, 4 parts of polyurea, 1 part of modified nano fumed silica, 10 parts of diisononyl phthalate, heavy carbonic acid 22 parts of calcium, 8 parts of No. 200 solvent oil, 0.03 parts of silicone defoamer, 0.1 part of tetramethylethylenediamine and 5.87 parts of imine latent curing agent; the preparation method is as follows:

[0073] (1) Weigh each raw material according to the formula, add the formula amount of polyether polyol 2000D, polyether polyol N330 and polyether polyol 3050 into the dehydration kettle under the protection of inert gas, and heat up to 80°C while stirring Start vacuuming w...

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Abstract

The invention discloses a preparation method of single-ingredient sag-resistant polyurethane waterproof paint. The method comprises the following steps of (1) under inert gas protection, mixing dewatered polyether polyol and first isocyanate; performing reaction to obtain polyurethane prepolymers; (2) pre-mixing the polyurethane prepolymer with modified nanometer calcium carbonate, polyurea, modified nanometer gas phase silicon dioxide and filling materials which are respectively dewatered; then, adding the mixture into a first double-screw extrusion machine for mixing dispersion and extrusionto obtain a dispersed mixed material, wherein the polyurea is prepared from second isocyanate and diamine through reaction; (3) adding the dispersed mixed material into a second double-screw extrusion machine; sequentially adding solvents and auxiliary agents; performing mixed dispersion and extrusion to obtain the single-ingredient sag-resistance polyurethane waterproof paint. The vacuum pumpingis needed in step (2) and step (3). The problems of implosion, skinning, non-uniform dispersion and the like directly or indirectly caused by poor flowability in the prior art can be solved. The produced polyurethane waterproof paint can also have excellent sag resistance performance.

Description

technical field [0001] The invention belongs to the field of thixotropic polyurethane waterproof coatings, in particular to a preparation method of a single-component anti-sagging polyurethane waterproof coating. Background technique [0002] At present, some large-scale projects, such as underground pipe corridors, basement walls of large-scale system venues, subways, tunnels or civil air defense, etc., need to be waterproofed on the facade or slope surface, but the construction of the facade or slope surface is inconvenient, and ordinary paint is easy to flow. The thickness is uneven, and it is inconvenient to scrape and coat manually, which is prone to quality problems. For example, if you want to apply a 1.5mm thick coating film, you may need to apply it four or five times, which greatly wastes labor and construction time. Therefore, developing a kind of polyurethane waterproof coating that can be applied on the facade or slope surface for mechanical spraying constructi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D175/02C09D7/62C09D7/63
CPCC08K2003/265C08K2201/011C09D7/62C09D7/63C09D175/08C08L75/02C08K9/06C08K9/04C08K3/36C08K3/26C08K5/12
Inventor 赵祖兵李忠人贺小刚陈进华
Owner JIANGSU CANLON BUILDING MATERIALS
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