阅读说明：本技术 一种桥梁用防腐涂料及其涂覆方法 (Anticorrosive paint for bridge and coating method thereof ) 是由 肖龙 王金权 沈翔 杨健 夏晓亮 陈鼎 李明辉 于 2021-09-23 设计创作，主要内容包括：本申请涉及涂料领域,具体公开了一种桥梁用防腐涂料及其涂覆方法。桥梁用防腐涂料包括如下以质量份数计的原料：50-80份聚硅氧烷树脂,20-30份改性酚醛树脂,8-15份沥青,30-40份无机填料,5-7份助剂；其涂覆方法为：对需要涂覆涂料的位置进行表面清洗并擦拭干净,按比例称取各原料并混合,制得防腐涂料,将防腐涂料进行涂覆,采用先上下后左右或先左右后上下的纵横涂装方法。本申请的桥梁用防腐涂料可作为面漆,用于桥梁钢结构的表面防护,其具有优异的防腐蚀性能和力学性能；另外,采用本申请的涂覆方法涂装后的漆膜光滑平整且厚度均匀。(The application relates to the field of coatings, and particularly discloses an anticorrosive coating for a bridge and a coating method thereof. The anticorrosive paint for the bridge comprises the following raw materials in parts by weight: 50-80 parts of polysiloxane resin, 20-30 parts of modified phenolic resin, 8-15 parts of asphalt, 30-40 parts of inorganic filler and 5-7 parts of auxiliary agent; the coating method comprises the following steps: cleaning the surface of a position needing coating and wiping the surface clean, weighing and mixing the raw materials according to the proportion to prepare the anticorrosive coating, coating the anticorrosive coating, and adopting a longitudinal and transverse coating method of firstly up and down and then left and right or firstly left and right and then up and down. The anticorrosive coating for the bridge can be used as finish paint for protecting the surface of a bridge steel structure, and has excellent anticorrosive performance and mechanical property; in addition, a paint film coated by the coating method is smooth and flat and has uniform thickness.)

1. The anticorrosive paint for the bridge is characterized by comprising the following raw materials in parts by mass:

50-80 parts of polysiloxane resin

20-30 parts of high-toughness phenolic resin

8-15 parts of asphalt

30-40 parts of inorganic filler

And 5-7 parts of an auxiliary agent.

2. The anticorrosive paint for bridges of claim 1, which is characterized in that: the polysiloxane resin is polysiloxane graft modified acrylic resin.

3. The anticorrosive paint for bridges of claim 1, which is characterized in that: the high-toughness phenolic resin is one of boron modified phenolic resin, nano silicon carbide modified phenolic resin, boron carbide modified phenolic resin and polyethylene-vinyl alcohol modified phenolic resin.

4. The anticorrosive paint for bridges of claim 3, wherein: the high-toughness phenolic resin is boron carbide modified phenolic resin.

5. The anticorrosive paint for bridges of claim 1, which is characterized in that: the mass ratio of the polysiloxane resin to the high-toughness phenolic resin is (1.9-2.5): 1.

6. the anticorrosive paint for bridges of claim 5, wherein: the mass ratio of the polysiloxane resin to the high-toughness phenolic resin to the asphalt is (9.5-12): 5: (1.6-2.4).

7. The anticorrosive paint for bridges of claim 1, which is characterized in that: the mass ratio of the polysiloxane resin to the inorganic filler is 1: (0.55-0.65).

8. The anticorrosive paint for bridges of claim 1, which is characterized in that: the inorganic filler is one or a mixture of more than two of rubber powder, titanium dioxide, zinc powder, bentonite, mica powder and talcum powder.

9. The anticorrosive paint for bridges of claim 8, wherein: the inorganic filler is a mixture of rubber powder and titanium dioxide, and the mass ratio of the rubber powder to the titanium dioxide is (2-3): 1.

10. a coating method of an anticorrosive paint for bridges according to any one of claims 1 to 9, comprising the steps of:

s1 surface treatment

Cleaning the surface of a position needing coating and wiping the position;

s2 preparation of paint

Weighing the raw materials in proportion and mixing to prepare the anticorrosive paint;

s3 coating paint

The anticorrosive paint is coated by a longitudinal and transverse coating method of firstly up and down and then left and right or firstly left and right and then up and down.

Technical Field

The application relates to the field of coatings, in particular to an anticorrosive coating for a bridge and a coating method thereof.

Background

The steel structure bridge has the advantages of large load capacity, large span, good stability, various structural forms, light and handy structure, short construction period, regeneration, environmental protection, wind resistance, corrosion resistance, shock resistance and the like, gradually replaces a concrete structure bridge, and becomes the main structural form of the current bridge building. Compared with the traditional concrete structure bridge, the steel structure bridge has high anticorrosive and antirust requirements, and the mechanical strength needs to be improved while the anticorrosive performance is improved so as to prolong the service life of the steel structure bridge.

Disclosure of Invention

In order to improve the mechanical strength while improving the corrosion resistance of the coating, the application provides the anticorrosive coating for the bridge and the coating method thereof.

In a first aspect, the application provides an anticorrosive paint for bridges, which adopts the following technical scheme:

an anticorrosive paint for bridges comprises the following raw materials in parts by weight:

50-80 parts of polysiloxane resin

20-30 parts of high-toughness phenolic resin

8-15 parts of asphalt

30-40 parts of inorganic filler

And 5-7 parts of an auxiliary agent.

By adopting the technical scheme, the anticorrosive paint with excellent performances such as corrosion resistance, adhesive force, heat resistance and the like can be obtained by adopting a mode of sharing the polysiloxane resin, the high-toughness phenolic resin and the asphalt.

Preferably, the polysiloxane resin is polysiloxane graft modified acrylic resin.

By adopting the technical scheme, the acrylic resin has excellent corrosion resistance, weather resistance and strong adhesive force, the organosiloxane has excellent heat resistance, low temperature resistance, water resistance and stain resistance, and the polysiloxane graft modified acrylic resin can have the advantages of the two, so that the coating with excellent performances in all aspects is obtained.

Preferably, the high-toughness phenolic resin is one of boron-modified phenolic resin, nano silicon carbide-modified phenolic resin, boron carbide-modified phenolic resin and polyethylene-vinyl alcohol-modified phenolic resin.

By adopting the technical scheme, the phenolic resin has the characteristic of high toughness, and the coating prepared by sharing the high-toughness phenolic resin and the polysiloxane resin can have good corrosion resistance and mechanical property, so that the adhesive force of the coating is improved, the coating can be attached to the surface of a steel structure for a long time, and the corrosion resistance of the steel structure is further improved.

Preferably, the high-toughness phenolic resin is boron carbide modified phenolic resin.

Preferably, the mass ratio of the polysiloxane resin to the high-toughness phenolic resin is (1.9-2.5): 1.

by adopting the technical scheme, when the mass ratio of the polysiloxane resin to the high-toughness phenolic resin is controlled within the range, the prepared coating has good corrosion resistance and mechanical property, and if the proportion of the high-toughness phenolic resin is too high, the corrosion resistance of the coating is poor.

Preferably, the mass ratio of the polysiloxane resin, the high-toughness phenolic resin and the asphalt is (9.5-12): 5: (1.6-2.4).

By adopting the technical scheme, when the mass ratio of the polysiloxane resin, the high-toughness phenolic resin and the asphalt is controlled within the range, the prepared coating has good corrosion resistance and mechanical property, and if the ratio of the polysiloxane resin is too low or the ratio of the asphalt is too high, the corrosion resistance of the coating is reduced.

Preferably, the mass ratio of the polysiloxane resin to the inorganic filler is 1: (0.55-0.65).

By adopting the technical scheme, the mass ratio of the polysiloxane resin to the inorganic filler is controlled within the range, so that the coating has good mechanical property, and if the mass ratio of the inorganic filler is too high, the mass ratio of the resin in the raw materials is too low, so that the corrosion resistance and the adhesive force of the coating are reduced, and the service life of the coating is shortened.

Preferably, the inorganic filler is one or a mixture of more than two of rubber powder, titanium dioxide, zinc powder, bentonite, mica powder and talcum powder.

By adopting the technical scheme, the inorganic filler is filled in the coating system, so that the mechanical property of the coating can be improved, the coating is not easy to be scratched locally under the action of external force after being coated on a steel structure, so that the steel structure is corroded by external force such as seawater, and the corrosion resistance effect of the coating is improved.

Preferably, the inorganic filler is a mixture of rubber powder and titanium dioxide, and the mass ratio of the rubber powder to the titanium dioxide is (2-3): 1.

by adopting the technical scheme, the addition of the rubber powder can reduce the using amount of the asphalt, so that the cost of the coating is reduced, and the service life of the coating can be prolonged. The titanium dioxide has the advantages of high strength, low density, corrosion resistance, high temperature resistance, low temperature resistance, no toxicity and the like. The corrosion resistance of the coating can be improved and the service life of the coating can be prolonged by using the two components together.

In a second aspect, the application provides a coating method of an anticorrosive paint for a bridge, which adopts the following technical scheme:

a coating method of an anticorrosive paint for bridges comprises the following steps:

s1 surface treatment

Cleaning the surface of a position needing coating and wiping the position;

s2 preparation of paint

Weighing the raw materials in proportion and mixing to prepare the anticorrosive paint;

s3 coating paint

The anticorrosive paint is coated by a longitudinal and transverse coating method of firstly up and down and then left and right or firstly left and right and then up and down.

By adopting the technical scheme, the paint film coated by the coating method has the characteristics of smoothness, flatness and uniform thickness.

In summary, the present application has the following beneficial effects:

1. the polysiloxane resin, the high-toughness phenolic resin and the asphalt are used together, so that the anticorrosive coating with excellent performances such as corrosion resistance, adhesive force, heat resistance and the like can be obtained;

2. polysiloxane graft modified acrylic resin is preferably adopted in the application, so that the coating has excellent corrosion resistance, weather resistance and adhesive force;

3. the inorganic filler is preferably a mixture of rubber powder and titanium dioxide, so that the cost of the coating is reduced, the service life of the coating is prolonged, and the corrosion resistance of the coating is improved.

Detailed Description

The present application will be described in further detail with reference to examples.

The starting materials used in the examples are commercially available, except where otherwise specified.

Preparation example of polysiloxane graft-modified acrylic resin

The acrylic resin is selected from polyacrylic acid of Shanghai Yien chemical technology Limited, with a product number of R002329, an average molecular weight of 3000, and is viscous liquid with a solid content of 30%; the polysiloxane is selected from dimethyl silicone oil of Shanghai Yien chemical technology, Inc., with a product number of R017340 and a viscosity of 350 + -25 mPa.s, the mixed solvent is prepared by mixing butyl acetate, n-butyl alcohol and toluene at a mass ratio of 1:2:3, and the catalyst is selected from BPO, AR, 99.0% of Shanghai Mielin Biotechnology, Inc.

The preparation process comprises the following steps: the preparation method comprises the following steps of weighing acrylic resin, polysiloxane, a mixed solvent and a catalyst according to the mass fraction ratio of 70:15:15:0.2, adding the acrylic resin and the polysiloxane into a three-neck flask with a temperature regulation device, a condensing device and a stirring device, adding the catalyst and the mixed solvent, starting the stirring and condensing device, heating to 80 ℃, keeping the temperature, and reacting for 2 hours to obtain the polysiloxane grafted modified acrylic resin.

Preparation example of boron carbide-modified phenol resin

The phenolic resin is selected from Shanghai Merlin Biotechnology, Inc., with a product number of P875865, a solid content of 70%, and boron carbide selected from nanometer boron carbide with a product number of YT-Y-04-5, an average particle size of 5 μm, and a purity of 99.9%.

The preparation process comprises the following steps: mixing the phenolic resin and the boron carbide according to the mass ratio of 20:1, and uniformly stirring to obtain the boron carbide modified phenolic resin.

Examples

The coating methods of the anticorrosive paint for bridges in examples 1 to 7 are the same, except for the difference in the components and the amounts of the raw materials (see table 2).

The following description will be given by taking example 1 as an example, wherein the polysiloxane resin is the polysiloxane graft modified acrylic resin obtained in the preparation example; the high-toughness phenolic resin is boron carbide modified phenolic resin prepared in the preparation example; the assistant is byk 190.

The coating method of the anticorrosive paint for the bridge disclosed by the embodiment 1 of the invention comprises the following steps:

s1 surface treatment

Washing the position needing coating with clean high-pressure water or scrubbing with clean cotton cloth, and drying and cleaning the surface after scrubbing;

s2 preparation of paint

Weighing the raw materials in proportion and mixing to prepare the anticorrosive paint;

s3 coating paint

The anticorrosive paint is coated by a longitudinal and transverse coating method of firstly up and down and then left and right or firstly left and right and then up and down.

TABLE 1

Example 5

This example varies the amount of silicone resin used based on example 3.

Example 5a

The present embodiment is different from embodiment 3 in that: the amount of silicone resin used was 50 kg.

Example 5b

The present embodiment is different from embodiment 3 in that: the amount of silicone resin used was 55 kg.

Example 5c

The present embodiment is different from embodiment 3 in that: the amount of silicone resin used was 65 kg.

Example 5d

The present embodiment is different from embodiment 3 in that: the amount of silicone resin used was 70 kg.

Example 6

This example varies the amount of bitumen based on example 3.

Example 6a

The present embodiment is different from embodiment 3 in that: the amount of bitumen used was 8 kg.

Example 6b

The present embodiment is different from embodiment 3 in that: the amount of bitumen used was 15 kg.

Example 7

In the present example, based on example 3, the amount of the inorganic filler was changed without changing the mass ratio of the rubber powder to the titanium dioxide.

Example 7a

The present embodiment is different from embodiment 3 in that: the amount of rubber powder was 20kg and the amount of titanium dioxide was 10 kg.

Example 7b

The present embodiment is different from embodiment 3 in that: the amount of rubber powder was 26kg and the amount of titanium dioxide was 13 kg.

Comparative example

Comparative example 1

This comparative example differs from example 1 in that: the raw materials were not added with high-toughness phenol resin, and the amount of polysiloxane resin was changed to 100 kg.

Comparative example 2

This comparative example differs from example 1 in that: the raw materials were not added with polysiloxane resin, and the amount of the high-toughness phenol resin was changed to 100 kg.

Comparative example 3

This comparative example differs from example 1 in that: no pitch was added to the raw materials and the amount of silicone resin used was 88 kg.

Performance test

HG/T3656-1999 Steel-structure bridge paint is selected for testing.

Salt spray resistance: the test is carried out by GB/T1765-79 (89) paint film preparation method for measuring humidity and heat resistance, salt mist resistance and weather resistance (artificial acceleration);

adhesion force: GB/T9286-98 'test for marking the paint film of the colored paint and the varnish' is adopted for testing;

wherein, the requirements of the long-acting finish paint are as follows: the paint film is flat, the adhesive force (cross-cut method) grade is less than or equal to 1, and the salt spray resistance is 1000h without foaming and falling off.

TABLE 2

As can be seen by combining examples 1 to 4 with Table 2, the anticorrosive coatings prepared in examples 1 to 4 have good anticorrosive effect and adhesion, with example 3 being preferred.

It can be seen by combining example 3 and examples 5a-5d and table 2 that the anticorrosive coatings of examples 5a, 5b, 3, 5c and 5d have a tendency of increasing and decreasing anticorrosive effect, and the anticorrosive coatings of examples 5b, 3 and 5c have good anticorrosive effect, and the anticorrosive coatings of examples 5a and 5d have poor anticorrosive effect.

As can be seen by combining example 3 with examples 6a-6b and by combining Table 2, the anticorrosive coating of example 6a is inferior in anticorrosive effect to example 3, the anticorrosive coating of example 6b is inferior in anticorrosive effect to example 3, and the anticorrosive coating of example 6b is inferior in anticorrosive effect to example 6 a.

The reason for this may be: in example 6a, the asphalt is added in an excessive amount, so that the corrosion resistance effect of the anticorrosive paint is reduced.

As can be seen by combining example 3 with examples 7a to 7b and by combining Table 2, the anticorrosive paint of example 7a is inferior in anticorrosive effect to example 3, the anticorrosive paint of example 7b is identical in anticorrosive effect to the anticorrosive paint of example 3, and the anticorrosive paint of example 7b is superior in anticorrosive effect to example 7 a.

As can be seen by combining example 3 with examples 8a-8b and by combining Table 2, the anticorrosive coatings of examples 8a and 8b are inferior in anticorrosive effect to the anticorrosive coating of example 3.

It can be seen by combining example 1 and comparative example 1 and table 2 that the corrosion resistant effect of the anticorrosive coating in comparative example 1 is similar to that of the anticorrosive coating in example 1, but the mechanical properties of the anticorrosive coating in comparative example 1 are obviously inferior to those of the anticorrosive coating in example 1, which indicates that the coating cannot have good corrosion resistant effect and mechanical strength by using the polysiloxane resin alone, and the polysiloxane resin and the asphalt do not have synergistic effect.

It can be seen by combining example 1 and comparative example 2 and table 2 that the corrosion resistant effect of the anticorrosive coating in comparative example 2 is obviously inferior to that of the anticorrosive coating in example 1, but the mechanical property of the anticorrosive coating in comparative example 2 is superior to that of the anticorrosive coating in example 1, which indicates that the coating cannot have a good corrosion resistant effect by using the high-toughness phenolic resin alone, and the high-toughness phenolic resin and the asphalt do not have a synergistic effect.

As can be seen by combining example 1 and comparative example 3 with Table 2, the anticorrosive effect of the anticorrosive paint in comparative example 3 is inferior to that of the anticorrosive paint in example 1, indicating that the addition of asphalt can improve the anticorrosive effect of the paint.

It can be seen from the combination of example 1 and comparative examples 1 to 3 and table 2 that the high-toughness phenolic resin, the polysiloxane resin and the asphalt have a synergistic effect when used together, the corrosion resistance of the coating can be improved, and the mechanical properties of the coating can be improved at the same time.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.