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A kind of nano silicon dioxide modified waterborne polyurethane waterproof coating and preparation method thereof

A nano-silica, water-based polyurethane technology, used in polyurea/polyurethane coatings, anti-corrosion coatings, coatings, etc., can solve the problems of poor corrosion resistance, flash corrosion of iron substrates, insufficient water resistance, etc., and improve the agglomeration. phenomena, good adhesion, good weather resistance

Active Publication Date: 2018-10-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcomings are mainly manifested in insufficient water resistance and poor corrosion resistance.
In addition, the construction and application performance are not satisfactory, such as slow drying speed; high cost and high price; water-based coatings may cause "flash corrosion" on iron substrates; high surface tension of the system causes wetting of substrates and pigments Poor sex, etc.

Method used

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  • A kind of nano silicon dioxide modified waterborne polyurethane waterproof coating and preparation method thereof
  • A kind of nano silicon dioxide modified waterborne polyurethane waterproof coating and preparation method thereof
  • A kind of nano silicon dioxide modified waterborne polyurethane waterproof coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation of nano-silica modified by the coupling agent involved in the present invention: take 10g nano-silica, 5g deionized water and 95g absolute ethanol, mix and ultrasonically disperse for half an hour, and adjust the pH to 4. Add 5.5g of silane coupling agent (KH-550), add in a constant temperature (90°C) water bath for 12h, and filter the reaction solution, dry (80°C) and grind to prepare modified nano-silica. Its modified effect is as figure 1 As shown, the particle size of aggregates becomes smaller after modification, and the number of large aggregates decreases;

[0033] Disperse the nano-silica modified by the coupling agent in water to obtain a pre-dispersed nano-silica solution; the mass ratio of the nano-silica modified by the coupling agent to water is 1:10; the pre-dispersed nano-silica The silicon solution is used in Examples 2-7.

[0034] The preparation method of the nano silicon dioxide modified waterborne polyurethane waterproof coating of ...

Embodiment 2

[0039] A nano-silica modified waterborne polyurethane waterproof coating, comprising the following components in parts by weight: 60 parts of polyurethane grafted acrylic acid emulsion, 1 part of polyether modified silicone (BX-690) defoamer, propylene glycol butadiene 3 parts of ether, 1.5 parts of polyether polyester copolymerized modified polysiloxane, 1 part of polycarboxylate water reducer, 3 parts of pre-dispersed nano-silica solution, 2 parts of sodium hexametaphosphate, 22 parts of talcum powder, 2 parts of hydroxypropyl methylcellulose, 15 parts of water.

Embodiment 3

[0041] The nano-silica modified waterborne polyurethane waterproof coating of the present invention comprises the following components in parts by weight: 60 parts of polyurethane grafted acrylic acid emulsion, 1 part of polyether modified silicone (BX-690) defoamer, propylene glycol 3 parts of butyl ether, 1.5 parts of polyether polyester copolymerized modified polysiloxane, 1 part of polycarboxylate water reducer, 4 parts of pre-dispersed nano-silica solution, 2 parts of sodium hexametaphosphate, light calcium carbonate 22 parts, 2 parts of hydroxypropyl methylcellulose, 20 parts of water.

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Abstract

The invention belongs to the technical field of waterproof paint and discloses nanometer silica-modified aqueous polyurethane waterproof paint and a preparation method thereof. The nanometer silica-modified aqueous polyurethane waterproof paint comprises, by weight, 60-80 parts of a polyurethane-grafted acrylic emulsion, 1-2 parts of an antifoaming agent, 2-6 parts of a film forming auxiliary agent, 1-4 parts of a leveling agent, 1-3 parts of a water reducer, 3-8 parts of a pre-dispersed nanometer silica solution, 2-5 parts of a thickening agent, 3-9 parts of a dispersant, 20-30 parts of a filling material and 15-30 parts of water. The nanometer silica-modified aqueous polyurethane waterproof paint utilizes water as a dispersion medium, does not contain an organic solvent, has the characteristics of environmental friendliness, no toxicity, low VOC, high adhesion, outstanding waterproofness, strong corrosion resistance and good weatherability and is suitable for a civil waterproof field and waterproof engineering such as tunnels, high-speed railway and subway.

Description

technical field [0001] The invention belongs to the technical field of waterproof coatings, in particular to a nano silicon dioxide modified waterborne polyurethane waterproof coating and a preparation method thereof. Background technique [0002] Polyurethane waterproof coatings are prepolymers containing isocyanate groups formed by addition polymerization of isocyanate and polyether, together with catalysts, anhydrous additives, anhydrous fillers, solvents, etc., and processed through mixing and other processes One-component polyurethane waterproof coating. The coating film has beautiful appearance and good decorative properties, and has been widely used in buildings, bridges and concrete because of its good flexibility, impact resistance, corrosion resistance, chemical resistance and excellent low temperature resistance. Engineering and other fields. In the protection process of concrete engineering, solvent-based polyurethane waterproof coatings show good toughness, we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C09D5/08C09D7/62
CPCC08K2201/011C08L2205/025C08L2205/035C09D5/08C09D7/61C09D7/62C09D7/63C09D7/65C09D175/04C08L83/12C08L1/284C08K13/06C08K9/06C08K3/36C08K5/06C08K3/34
Inventor 余其俊龙庆胡捷韦江雄黄锦圳余生荣
Owner SOUTH CHINA UNIV OF TECH