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Anti-sagging single-component polyurea coating and preparation method thereof

A single-component, anti-sagging technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of large amount of anti-sagging additives, increased viscosity of the coating system, and small effective production volume. Good dispersibility, good thixotropy, and excellent thixotropic effect

Active Publication Date: 2017-04-26
中建材苏州防水研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing anti-sagging one-component polyurea coatings usually add fumed silica, organic bentonite, polyamide wax powder, etc. as anti-sagging agents (thixotropic agents), which have the following deficiencies: (1) Addition of anti-sag additives Large quantities require high shear force to disperse evenly during production, and require high production equipment. At present, the general equipment for producing anti-sagging coatings is a double planetary dispersion kettle, which has high equipment cost and small effective production volume. Existing on the market The equipment is less than 1100L, the production efficiency is low, and the production operation is quite troublesome; (2) Adding traditional anti-sagging agent will cause the viscosity of the coating system to increase, which is only suitable for the scrape coating construction process, and physical bubbles are likely to be generated during the construction process. If mechanical Spraying requires the addition of a large amount of organic solvents; (3) using fumed silica as an anti-sag additive, it is necessary to dehydrate and dry the fumed silica separately and then add it to the system. The operation is very troublesome and dust pollution occurs during drying question

Method used

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  • Anti-sagging single-component polyurea coating and preparation method thereof
  • Anti-sagging single-component polyurea coating and preparation method thereof
  • Anti-sagging single-component polyurea coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This example provides a kind of preparation method of hyperbranched polyurea anti-sagging agent, implements as follows:

[0039] Feed the diisocyanate monomer IPDI and butanol at a molar ratio of 2.2:1, and mix and react for 3 hours under nitrogen protection at a temperature of 75°C to prepare a monoisocyanate-terminated prepolymer;

[0040] Dissolve hyperbranched polyethyleneimine in a mixed solvent of dimethylformamide and N-methylpyrrolidone (volume ratio 1:1), add monoisocyanate-terminated prepolymer, and the molar ratio of isocyanate groups to amino protons is 1.1 : 1, mixed reaction 1.5h, reaction temperature 30-40 ℃, obtain hyperbranched polyurea anti-sagging agent.

Embodiment 2

[0042] This example provides a kind of preparation method of hyperbranched polyurea anti-sagging agent, implements as follows:

[0043] Feed the diisocyanate monomer TDI and hexyl alcohol according to the molar ratio of 2.2:1, and mix and react for 2.5 hours under the protection of nitrogen and at a temperature of 80°C to prepare a monoisocyanate-terminated prepolymer;

[0044] Dissolve hyperbranched polyethyleneimine in a mixed solvent of dimethylformamide and N-methylpyrrolidone (volume ratio 1:1), add monoisocyanate-terminated prepolymer, and the molar ratio of isocyanate groups to amino protons is 1.1 : 1, mixed reaction 2h, reaction temperature 30-40 ℃, namely the hyperbranched polyurea anti-sagging agent.

Embodiment 3

[0046] This example provides a kind of anti-sag one-component polyurea coating, and its raw material formula is: diphenylmethane diisocyanate TDI (BASF T-80) 20 parts, polyether polyol (2471, the United States pottery) Shi Chemical) 55 parts, chain extender 10 parts (FT-6270, Suzhou Feite Brothers New Material Technology Co., Ltd.), gray color paste 5 parts (Clariant), oxazolidine latent curing agent (MS-201, Qingdao Hengke New Material Technology Co., Ltd.) 3 parts, organic bismuth catalyst (Shanghai Hemu Chemical Co., Ltd.) 0.5 part, defoamer (BYK-1790, Bi Ke, Germany) 0.3 part and hyperbranched polyurea anti-sagging agent (embodiment 1 Prepared) 1 part.

[0047] The preparation method of anti-sagging one-component polyurea coating is as follows:

[0048] Step 1: In the closed reaction kettle, add 2471 polyether and color paste, stir and raise the temperature, control the temperature at 100-120°C, turn on the vacuum pump to draw negative pressure, control the pressure below...

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Abstract

The invention relates to an anti-sagging single-component polyurea coating and a preparation method thereof. An anti-sagging agent of the polyurea coating is hyperbranched polyurea formed by a reaction on hyperbranched polyethyleneimine and a mono-isocyanate blocking prepolymer, wherein the molecular structure of the hyperbranched polyethyleneimine contains 10-30 nitrogen atoms; the mono-isocyanate blocking prepolymer is obtained by performing a reaction on a diisocyanate monomer and a monohydric alcohol with 3-12 carbon atoms. The anti-sagging single-component polyurea coating provided by the invention is simple in production process, high in production efficiency, convenient for construction and suitable for protective engineering of vertical faces, slopes and planes.

Description

technical field [0001] The invention relates to a protective coating, in particular to a waterproof and anti-corrosion coating suitable for planes, slopes and facades and a preparation method thereof. Specifically, the present invention relates to an anti-sagging one-component polyurea coating and a preparation method thereof. Background technique [0002] One-component polyurea coating is a single-package liquid composed of prepolymers containing polyisocyanate (-NCO) functional groups or chemically blocked polyisocyanate functional groups, blocked amino latent curing agents, auxiliary agents, etc. Mixture; exposed to the air after opening the barrel, the latent curing agent hydrolyzes to release the amino group, and forms a high molecular polymer elastomer with all urea-based cross-linking points with isocyanic acid. There is no carbon dioxide generated during the curing and crosslinking process, which prevents the occurrence of chemical bubbles from the source. Compared...

Claims

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Application Information

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IPC IPC(8): C09D175/02C09D7/12C08G18/10C08G18/65C08G18/64C08G18/28
CPCC08G18/10C08G18/282C08G18/2825C08G18/6423C08G18/65C08L2205/025C09D7/65C09D175/02C08L75/02C08G18/64
Inventor 沈春林康杰分王玉峰褚建军杨炳元
Owner 中建材苏州防水研究院有限公司
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