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Waterborne room-temperature self-curing inorganic zinc rich coating

An inorganic zinc-rich coating and self-curing technology, which is applied in the direction of anti-corrosion coatings, alkali metal silicate coatings, coatings, etc., can solve the problems of increased preparation costs, unstable storage of silicate resins, and high cost, and achieve improved Effects of early water resistance and adhesion, improvement of final film-forming performance, and improvement of anti-corrosion performance

Active Publication Date: 2011-08-10
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional silicate production has the disadvantages of complicated process and high cost, and the storage of silicate resin is unstable and easy to gel. These problems greatly limit the popularization and application of water-based inorganic zinc-rich coatings
For example, the water-based lithium silicate inorganic zinc-rich coating developed by China Hi-Tech Group Co., Ltd. uses lithium silicate as a binder and has excellent cathodic protection anticorrosion effect. The disadvantage is that lithium silicate is expensive and has poor thermal strain performance. Good; the Chinese Invention Patent No. CN1254736 discloses a high-modulus potassium silicate inorganic zinc-rich coating, which is prepared by reacting a low-modulus potassium silicate solution at a temperature as high as 70°C. It is necessary to increase the heating device and temperature control equipment, which will increase the production cost; at the same time, the use of a single zinc powder will cause the coating to fall off in a large area when the temperature is high
Existing technology hinders the promotion of waterborne inorganic zinc-rich coatings

Method used

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  • Waterborne room-temperature self-curing inorganic zinc rich coating

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A water-based room-temperature self-curing inorganic zinc-rich coating comprises a base material and a powder; wherein the base material is prepared by the following steps:

[0031] 1) Take 18.78kg of potassium silicate solution with a modulus of 3.6 and a solid content of 28% by weight and pour it into a container with a stirring device, add 2.58kg of water, start stirring at a low speed of 400r / min for 10 Minutes to mix the potassium silicate solution evenly.

[0032] 2) Increase the rotation speed to 1500r / min, weigh 5.61kg of silica sol with a particle size of 7nm and a solid content of about 30%, slowly drop it into the container, and keep a stable vortex for about 30min, at this time the solution turns from white to translucent viscous solution.

[0033] 3) Add 2.22 kg of water while stirring, so that the viscosity of the obtained solution is moderate, and the pH is about 11 at this time.

[0034] 4) Slowly add a total amount of 0.3 kg of methyltrimethoxysilane ...

Embodiment 2

[0042] A water-based room temperature self-curing inorganic zinc-rich coating, comprising a base material and a powder; wherein, the preparation process of the base material is as follows:

[0043] 1) Take 12kg of lithium silicate solution with a modulus of 3.3 and a solid content of 25% and pour it into a container with a stirring device, add 2.58kg of water, stir at a low speed of 300r / min, and continue for 15 minutes to make the lithium silicate solution well mixed.

[0044] 2) Increase the rotating speed to 1500r / min, weigh 9kg of silica sol with a particle size of 10nm and a solid content of about 30%, slowly drop it into the container, and keep a stable vortex for about 30min. At this time, the solution changes from white to translucent viscous thick solution.

[0045] 3) Add 2.82 kg of water while stirring, so that the viscosity of the obtained solution is moderate, and the pH is about 11 at this time, and stir for 10 minutes.

[0046] 4) Slowly add 3 kg of methyltrie...

Embodiment 3

[0054] A water-based room temperature self-curing inorganic zinc-rich coating, comprising a base material and a powder; wherein, the preparation process of the base material is as follows:

[0055] 1) Take 15kg of sodium silicate solution with a modulus of 2.8 and a solid content of 28% and pour it into a container with a stirring device, add 2.5kg of water, start stirring at a low speed of 500r / min for 10 minutes to mix the potassium silicate solution uniform.

[0056] 2) Increase the rotation speed to 1200r / min, weigh 7.8kg of silica sol with a particle size of 20nm and a solid content of about 30%, slowly drop it into the container, and keep a stable vortex for about 30min, at this time the solution turns from white to translucent viscous solution.

[0057] 3) Add 3.26 kg of water while stirring, so that the viscosity of the obtained solution is moderate, and the pH is about 11 at this time, and stir for 10 minutes.

[0058] 4) Slowly add 1.2kg of methyltrimethoxysilane d...

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Abstract

The invention discloses waterborne room-temperature self-curing inorganic zinc rich coating. The coating is prepared by uniformly mixing a prepared base stock and powder in a mass ratio of 1:1.5-3.5, wherein the process of preparing the base stock comprises the following steps of: adding 5 to 10 parts of water into alkali metal silicates solution with the mode number of 2.5 to 3.7 and stirring the mixture at low speed; then adding silica sol drops with the grain diameter of 7 to 20nm and the solid content of 25 to 32 percent, dripping 1 to 10 parts of silane coupling agent and adding 0.5 to 2parts of stabilizing agent; and filtering out precipitates to obtain the transparent base stock. The inorganic zinc rich coating has high drying speed and good early-period waterproofness and can resist to washing with certain pressure after being dried for 20 minutes, has good salt spray corrosion resistance due to the adoption of multiple anticorrosion mechanisms and can resist to the high temperature of 400 DEG C. Meanwhile, the constructability of the conventional waterborne inorganic zinc rich coating is greatly improved; and the corrosion resistance year limit can reach over 15 years. The paint is prepared at normal temperature under normal pressure and has low production cost. The environmental protection requirement is met.

Description

technical field [0001] The invention relates to a zinc-rich anticorrosion coating, in particular to a water-based room-temperature self-curing inorganic zinc-rich coating and a preparation method thereof. Background technique [0002] Paint is a material that can be coated on the surface of an object by different construction techniques to form a solid film with firm adhesion, certain strength, and continuity. , mainly play a decorative or protective role. The surface of steel exposed to the air for a long time is prone to rust, thereby reducing the mechanical properties of steel and affecting the service life of steel as a mechanical component. Therefore, it is often necessary to coat the surface of steel with anti-corrosion coatings to isolate the steel from the air and play a protective role. . Anti-corrosion coatings mainly include two categories: organic and inorganic, among which organic resin coatings mainly include epoxy resin, acrylic resin, alkyd resin, chloroeth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/04C09D7/12C09D5/10
CPCC09D5/106
Inventor 瞿金清彭刚阳王代民
Owner SOUTH CHINA UNIV OF TECH
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