阅读说明：本技术 一种含醇胺修饰无定形二氧化硅的防锈粉及其生产方法 (Antirust powder containing alcohol amine modified amorphous silicon dioxide and production method thereof ) 是由 胡颖妮 胡湘仲 喻宁亚 胡伟民 苏胜培 于 2019-08-23 设计创作，主要内容包括：本发明公开了一种含醇胺修饰无定形二氧化硅的防锈粉以及该防锈粉的生产方法。其中,该含醇胺修饰无定形二氧化硅的防锈粉包括50-60份磷酸钙、15-16份醇胺修饰无定形二氧化硅防锈填料、3-8份纳米氧化钙粉、1-2份纳米氧化钛粉、5-9份偶联剂、1-3份滑石粉。与现有技术相比,该防锈粉的防锈性能好、分散性好,能够很好地与涂料融合,从而增强涂料的防锈性能。该防锈粉的生产方法操作简单、方便,生产成本低。(The invention discloses an anti-rust powder containing alcohol amine modified amorphous silicon dioxide and a production method of the anti-rust powder. The anti-rust powder containing the alcohol amine modified amorphous silicon dioxide comprises 50-60 parts of calcium phosphate, 15-16 parts of alcohol amine modified amorphous silicon dioxide anti-rust filler, 3-8 parts of nano calcium oxide powder, 1-2 parts of nano titanium oxide powder, 5-9 parts of a coupling agent and 1-3 parts of talcum powder. Compared with the prior art, the antirust powder has good antirust performance and dispersibility, and can be well fused with the coating, so that the antirust performance of the coating is enhanced. The production method of the anti-rust powder is simple and convenient to operate and low in production cost.)

1. An alcohol amine modified amorphous silica antirust powder, which is characterized in that: comprises 50-60 parts of calcium phosphate, 15-16 parts of alcohol amine modified amorphous silicon dioxide antirust filler, 3-8 parts of nano calcium oxide powder, 1-2 parts of nano titanium oxide powder, 5-9 parts of coupling agent and 1-3 parts of talcum powder.

2. The rust preventive powder as claimed in claim 1, wherein: the antirust coating comprises 55 parts of calcium phosphate, 15.5 parts of alcohol amine modified amorphous silicon dioxide antirust filler, 6 parts of nano calcium oxide powder, 1.5 parts of nano titanium oxide powder, 8 parts of coupling agent and 2 parts of talcum powder; the coupling agent is a silane coupling agent.

3. The rust preventive powder as claimed in claim 1, wherein: the preparation method of the alcohol amine modified amorphous silica antirust filler comprises the following steps:

1) preparing materials: preparing a water glass solution with the silicon dioxide content of 5-25 wt%, and preparing a sulfuric acid solution with the concentration of 10-50 wt%;

2) synthesizing: adding a sulfuric acid solution into the reaction kettle, and adding a water glass solution to adjust the pH value of the system to 1-4; standing for 30-120 minutes after uniform stirring, wherein the reaction temperature is 30-60 ℃; after standing, adjusting the pH value of the mixed solution to 6-8, simultaneously heating to 70-100 ℃, and keeping for 10-120 minutes;

3) adjusting the pH value of the system to 2-4, and keeping for 20 minutes;

4) and filtering and washing the reaction product, adding alcohol amine after filtering and washing, and then carrying out spray drying and crushing.

4. The rust preventive powder as claimed in claim 3, wherein: the preparation method of the alcohol amine modified amorphous silica antirust filler comprises the following steps:

1) preparing materials: preparing a water glass solution with the silicon dioxide content of 20 wt%, and preparing a sulfuric acid solution with the concentration of 30 wt%;

2) synthesizing: adding a sulfuric acid solution into the reaction kettle, and then adding a water glass solution to adjust the pH value of the system to 1.5; the time for adding the water glass solution is 30 minutes; standing for 90 minutes after uniform stirring, wherein the reaction temperature is 50 ℃; after standing, adjusting the pH value of the mixed solution to 8, simultaneously heating to 90 ℃, and keeping for 30 minutes;

3) adjusting the pH value of the system to 3.5, and keeping for 20 minutes;

4) and filtering and washing the reaction product, adding alcohol amine after filtering and washing, and then carrying out spray drying and crushing.

5. The rust preventive powder as claimed in claim 3, wherein: in the step 4), the reaction product is filtered and washed until the conductivity is less than 50 mu S/cm.

6. The rust preventive powder as claimed in claim 3, wherein: and the temperature of the spray drying outlet is 110-150 ℃, and the alcohol amine modified amorphous silica antirust filler is crushed to 2-4 mu m.

7. The rust preventive powder as claimed in claim 3, wherein: the method comprises the following steps: in the step 4), the alcohol amine is one or two of ethanolamine or 6-amino-1-hexanol.

8. The rust preventive powder as claimed in claim 7, wherein: in the step 4), the weight ratio of the silicon dioxide to the alcohol amine is 100: (1-5).

9. A process for producing an anticorrosive powder as claimed in claim 1, which comprises: taking 50-60 parts of calcium phosphate with the fineness of 1000 meshes, adding 15-16 parts of alcohol amine modified amorphous silicon dioxide antirust filler crushed to 2-4 mu m into the calcium phosphate, sequentially adding 3-8 parts of nano calcium oxide powder, 1-2 parts of nano titanium oxide powder, 5-9 parts of coupling agent and 1-3 parts of talcum powder, mixing and stirring uniformly, and finally packaging to obtain the finished product.

Technical Field

The invention relates to the technical field of powder coatings, in particular to antirust powder containing alcohol amine modified amorphous silicon dioxide and a production method thereof.

Background

The metal material is the basis of human material civilization, and metal corrosion causes huge loss to the human society, and according to statistics, the amount of steel lost due to rusting accounts for one fourth of the annual output every year in the world. Therefore, how to reduce the corrosion of metal, especially steel products, becomes an important issue. At present, there are many methods for preventing the rapid corrosion of steel products, and the most effective method is to apply an anti-corrosion coating on the surface of the steel products to prevent the metal surface from directly contacting with moisture and oxygen in the air; the rust-proof pigment has physical and chemical rust-proof functions.

The traditional rust-proof fillers containing heavy metals such as red lead, lead powder, chromate and the like cause great harm to the environment and human beings, and along with the development of times, the fillers are inevitably replaced by novel non-toxic rust-proof fillers. In fact, the perfection of environmental legislation, many countries have begun to strictly prohibit the use of such rust-inhibiting fillers. The currently used nontoxic antirust fillers are mainly divided into two types according to the antirust mechanism: 1. the physical antirust filler mainly comprises iron oxide red, mica powder, glass flakes, stainless steel flakes and the like; 2. the chemical antirust stuffing mainly comprises phosphate antirust stuffing, borate antirust stuffing and the like, and the antirust stuffing can form a compact metal salt film with ferrous iron and iron ions to cover the surface of a steel product so as to prevent the further corrosion of the product.

However, when the above anticorrosive filler is applied to a paint, the above anticorrosive filler is not well fused with other components in the paint, and is uniformly dispersed in the paint, so that the anticorrosive performance of the paint is not enhanced, and the anticorrosive function of the anticorrosive filler itself is affected.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention has the following objects: the antirust powder containing the alcohol amine modified amorphous silica has good antirust performance and good dispersibility, and can be well fused with a coating, so that the antirust performance of the coating is enhanced.

The second purpose of the invention is: the production method of the antirust powder containing the alcohol amine modified amorphous silicon dioxide is simple and convenient to operate and low in production cost.

One of the purposes of the invention is realized by adopting the following technical scheme:

an anti-rust powder containing alkylamine modified amorphous silica comprises 50-60 parts of calcium phosphate, 15-16 parts of alcohol amine modified amorphous silica anti-rust filler, 3-8 parts of nano calcium oxide powder, 1-2 parts of nano titanium oxide powder, 5-9 parts of a coupling agent and 1-3 parts of talcum powder.

Further, 55 parts of calcium phosphate, 15.5 parts of alcohol amine modified amorphous silicon dioxide antirust filler, 6 parts of nano calcium oxide powder, 1.5 parts of nano titanium oxide powder, 8 parts of coupling agent and 2 parts of talcum powder; the coupling agent is a silane coupling agent.

Further, the preparation method of the alcohol amine modified amorphous silica antirust filler comprises the following steps:

1) preparing materials: preparing a water glass solution with the silicon dioxide content of 5-25 wt%, and preparing a sulfuric acid solution with the concentration of 10-50 wt%;

2) synthesizing: adding a sulfuric acid solution into the reaction kettle, and adding a water glass solution to adjust the pH value of the system to 1-4; standing for 30-120 minutes after uniform stirring, wherein the reaction temperature is 30-60 ℃; after standing, adjusting the pH value of the mixed solution to 6-8, simultaneously heating to 70-100 ℃, and keeping for 10-120 minutes;

3) adjusting the pH value of the system to 2-4, and keeping for 20 minutes;

4) and filtering and washing the reaction product, adding alcohol amine after filtering and washing, and then carrying out spray drying and crushing.

Further, the preparation method of the alcohol amine modified amorphous silica antirust filler comprises the following steps:

1) preparing materials: preparing a water glass solution with the silicon dioxide content of 20 wt%, and preparing a sulfuric acid solution with the concentration of 30 wt%;

2) synthesizing: adding a sulfuric acid solution into the reaction kettle, and then adding a water glass solution to adjust the pH value of the system to 1.5; the time for adding the water glass solution is 30 minutes; standing for 90 minutes after uniform stirring, wherein the reaction temperature is 50 ℃; after standing, adjusting the pH value of the mixed solution to 8, simultaneously heating to 90 ℃, and keeping for 30 minutes;

3) adjusting the pH value of the system to 3.5, and keeping for 20 minutes;

4) and filtering and washing the reaction product, adding alcohol amine after filtering and washing, and then carrying out spray drying and crushing.

Further, in step 4), the reaction product is filtered and washed to a conductivity of < 50. mu.S/cm.

Further, the temperature of an outlet of spray drying is 110-150 ℃, and the alcohol amine modified amorphous silica antirust filler is crushed to 2-4 μm.

Further, comprising: in the step 4), the alcohol amine is one or two of ethanolamine or 6-amino-1-hexanol.

Further, in the step 4), the weight ratio of the silicon dioxide to the alcohol amine is 100: (1-5).

The second purpose of the invention is realized by adopting the following technical scheme:

50-60 parts of calcium phosphate with the fineness of 1000 meshes are taken, 15-16 parts of alcohol amine modified amorphous silicon dioxide antirust filler crushed to 2-4 mu m is added into the calcium phosphate, then 3-8 parts of nano calcium oxide powder, 1-2 parts of nano titanium oxide powder, 5-9 parts of coupling agent and 1-3 parts of talcum powder are sequentially added, the components are uniformly mixed and stirred, and finally the finished product is obtained by packaging.

Compared with the prior art, the invention has the beneficial effects that:

the invention discloses antirust powder containing alcohol amine modified amorphous silica, wherein alcohol amine modified amorphous silica antirust filler is added into the antirust powder, wherein the alcohol amine changes the surface polarity of the amorphous silica, improves the dispersion performance of amorphous silica particles in a coating, improves the acting force between the amorphous silica particles and a coating resin, and increases the crosslinking density of the coating resin, so that the antirust powder can be well dispersed in the coating. The amorphous oxide has high specific surface area and good adsorption performance, so that the amorphous silicon dioxide can adsorb attack ions in the coating and delay the generation of anode ferrous or iron ions; second, silica dissociates under alkaline conditions, releasing silicate ions. When the cathodic reaction occurs and the basicity of the region increases, hydroxide ions are consumed to release silicate ions. The silicate ions and ferrous ions or ferric ions generate insoluble silicate to cover the surfaces of the cathode and the anode to form a passivation protective film, so that the generation of the reaction of the cathode and the anode electrodes is blocked, the metal product is effectively prevented from rusting, and the antirust performance of the coating is enhanced.

Detailed Description

The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment. The materials used in this example are all commercially available.