Anticorrosive organosilicon coating spray and preparation method thereof

Abstract

The present invention belongs to the field of organic coatings, and specifically relates to an anticorrosive silicone coating spray, including α,ω-dihydroxy polysiloxane, polydimethylsiloxane, phenyl silicone oil, fumed silica, a crosslinking agent, a coupling agent, a catalyst, and a solvent; the weight ratio of the α,ω-dihydroxy polysiloxane, polydimethylsiloxane, and phenyl silicone oil is 50-150:2-10:10-20; the crosslinking agent is composed of vinyl trisbutyl ketoxime silane, methyl trisbutyl ketoxime silane, and tetrasbutyl ketoxime silane. The spray of the present invention adopts α,ω-dihydroxy polysiloxane as the main glue, polydimethylsiloxane and phenyl silicone oil as auxiliary glue, and can maintain the better flexibility of the coating by optimizing the composition of the crosslinking agent, and maintain good flexibility in an accelerated aging environment, and at the same time, by adopting α,ω-dihydroxy polysiloxane as the main glue and optimizing the composition of the crosslinking agent, the actual drying time can be controlled within 60min. Meanwhile, the invention also discloses a preparation method of the spray.

Description

Technical Field

[0001] The invention belongs to the field of organic coatings, and in particular relates to an anticorrosive organic silicon coating spray and a preparation method thereof. Background Art

[0002] The applicant previously filed an invention patent application CN110791101B, which discloses an organic silicon waterproof and aging-resistant material and a preparation method thereof;

[0003] It uses hydroxy silicone oil as the main rubber, terminal hydrogen silicone oil and diphenyl silicone oil as auxiliary rubbers, and methyl tributylacetoximate silane and tetrabutyl ketone oxime silane as crosslinking agents to improve the aging crystallization performance of silicone.

[0004] In actual production, silicone coatings are mostly used in harsh environments, and in most cases the substrate is thin, which requires them to maintain good flexibility under aging conditions so that the coating will not crack when the substrate deforms. At the same time, controlling the material's actual drying time to less than 60 minutes is still a difficult performance indicator to achieve. Summary of the invention

[0005] In view of the shortcomings of the prior art, the first object of the present invention is to provide an anti-corrosion silicone coating spray. The spray of the present invention adopts α, ω-dihydroxypolysiloxane as the main glue, and polydimethylsiloxane and phenyl silicone oil as auxiliary glues. By optimizing the composition of the cross-linking agent, the coating can maintain good flexibility and maintain good flexibility in an accelerated aging environment. At the same time, by using α, ω-dihydroxypolysiloxane as the main glue and optimizing the cross-linking agent composition, the actual drying time can be controlled within 60 minutes.

[0006] Meanwhile, the invention also discloses a preparation method of the spray.

[0007] To achieve the purpose of the present invention, the present invention adopts the following technical solutions:

[0008] An anti-corrosion organic silicon coating spray, comprising α,ω-dihydroxy polysiloxane, polydimethylsiloxane, phenyl silicone oil, fumed silica, a crosslinking agent, a coupling agent, a catalyst, and a solvent;

[0009] The weight ratio of the α,ω-dihydroxy polysiloxane, polydimethylsiloxane and phenyl silicone oil is 50-150:2-10:10-20;

[0010] The crosslinking agent consists of vinyl tributylacetoximate silane, methyl tributylacetoximate silane and tetrabutyl tributylacetoximate silane.

[0011] In the above-mentioned anticorrosive silicone coating spray, the weight ratio of the vinyl tributylacetoximate silane, methyl tributylacetoximate silane and tetrabutyl tributylacetoximate silane is 1-2:3-7:2-3.

[0012] In the above-mentioned anticorrosive silicone coating spray, the weight ratio of the α,ω-dihydroxy polysiloxane to the crosslinking agent is 50-150:6-12.

[0013] In the above-mentioned anticorrosive silicone coating spray, the polydimethylsiloxane is composed of low-viscosity polydimethylsiloxane and medium-viscosity polydimethylsiloxane; the weight ratio of the low-viscosity polydimethylsiloxane to the medium-viscosity polydimethylsiloxane is 1 to 5:1.

[0014] In the above-mentioned anticorrosive silicone coating spray, the coupling agent is isopropyl triisostearate titanate and / or γ-methacryloxypropyl trimethoxysilane; the weight ratio of the coupling agent to α,ω-dihydroxy polysiloxane is 0.5-1:50-150.

[0015] In the above-mentioned anti-corrosion organic silicon coating spray, the catalyst is dibutyltin dilaurate; the weight ratio of the catalyst to α,ω-dihydroxypolysiloxane is 0.01-0.05:50-150.

[0016] In the above-mentioned anti-corrosion organic silicon coating spray, the solvent is solvent oil; the weight ratio of the solvent oil to α,ω-dihydroxy polysiloxane is 200-300:50-150.

[0017] In the above-mentioned anticorrosive organosilicon coating spray, the weight ratio of the fumed silica to α,ω-dihydroxypolysiloxane is 20-40:50-150.

[0018] At the same time, the present invention also discloses a method for preparing the anti-corrosion organic silicon coating spray as described above, the method specifically comprising:

[0019] Add α,ω-dihydroxy polysiloxane, polydimethylsiloxane, phenyl silicone oil and fumed silica into a reactor, and stir and mix under vacuum at 130-140° C. to obtain a base material;

[0020] The base material, cross-linking agent, coupling agent, catalyst and solvent are mixed, vacuumized and reacted at 60-70°C for 1-2h, and the material is discharged after the reaction is completed.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention adopts α, ω-dihydroxy polysiloxane as the main glue, and adopts polydimethylsiloxane and phenyl silicone oil as auxiliary glues. By optimizing the composition of the cross-linking agent, the coating can maintain good flexibility and maintain good flexibility in an accelerated aging environment. At the same time, by adopting α, ω-dihydroxy polysiloxane as the main glue and optimizing the composition of the cross-linking agent, the actual drying time can be controlled within 60 minutes. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0024] The suppliers of the raw materials of the present invention are:

[0025] α,ω-dihydroxypolysiloxane: 20000mPa.s, Shandong Dongyue Silicone Materials Co., Ltd.;

[0026] Low viscosity polydimethylsiloxane: 350±8CS; Foshan Shunde Pengkaida Silicone Industrial Co., Ltd.;

[0027] Medium viscosity polydimethylsiloxane: 5000±400CS; Pengkaida Organic Silicone Industrial Co., Ltd., Shunde District, Foshan City;

[0028] Phenyl silicone oil: Dongguan Airui Chemical Co., Ltd.

[0029] Example

[0030] Add α,ω-dihydroxy polysiloxane, polydimethylsiloxane, phenyl silicone oil and fumed silica into a reactor, and stir and mix under vacuum at 130-140° C. to obtain a base material;

[0031] The base material, cross-linking agent, coupling agent, catalyst and solvent are mixed, vacuumized and reacted at 60-70°C for 1.5h, and the material is discharged after the reaction is completed.

[0032] The formula of each embodiment is shown in Table 1;

[0033] Table 1 Formula Unit: g

[0034]

[0035] Comparative Example 1

[0036] The method is substantially the same as Example 1, except that the crosslinking agent is composed of the following components: 5.5 g of methyl tributylidene oxime silane;

[0037] 3.5 g of tetrabutyl ketoxime silane.

[0038] Comparative Example 2

[0039] The same as Example 1, except that the crosslinking agent is composed of the following components: 1 g vinyl tris(methyl isobutyl ketoxime) silane

[0040] Methyl trisbutyl ketoxime silane 5g;

[0041] 3g of tetrabutyl ketoxime silane.

[0042] Comparative Example 3

[0043] The method is substantially the same as Example 1, except that the amount of the main rubber α,ω-dihydroxypolysiloxane used is 115 g, and the amount of the phenyl silicone oil used is 0 g.

[0044] Comparative Example 4

[0045] The method is substantially the same as Example 1, except that the amount of the main rubber α,ω-dihydroxypolysiloxane is 85 g, the low-viscosity polydimethylsiloxane is 3 g, the medium-viscosity polydimethylsiloxane is 1 g, and the phenyl silicone oil is 30 g.

[0046] Performance Testing

[0047] 1. Flexibility: GB / T1731-93; the appearance of cracks in the shaft rod is used as the judgment indicator. The shaft rods are numbered from 1 to 7. The larger the number, the stronger the flexibility.

[0048] 2. Flexibility after aging: After 72h of static treatment at 160℃ and steam pressure of 0.5MPa, the flexibility is tested using GB / T1731-93;

[0049] The test results can be found in Table 2;

[0050] Table 2 Test results

[0051]

[0052]

[0053] Result analysis:

[0054] 1. It can be seen from Examples 1-3 that the technical solution of the present invention can achieve better flexibility results, aging-resistant flexibility results, excellent adhesion and faster surface drying time;

[0055] 2. It can be seen from Examples 1, 4 and 5 that with the change in the amount of cross-linking agent used, the surface drying time and the actual drying time change to a certain extent. When the amount of cross-linking agent is reduced, the surface drying and actual drying time are shortened, and when the amount of cross-linking agent is increased, the surface drying and actual drying time are increased. At the same time, when the amount of cross-linking agent used is small, the flexibility of the coating after aging is significantly reduced.

[0056] 3. It can be seen from Examples 1, 6 and 7 that the use of polydimethylsiloxane with a single molecular weight has a certain negative impact on the surface drying time and the actual drying time.

[0057] 4. By comparing Example 1 and Comparative Examples 1 to 4, it can be seen that after the composition of the cross-linking agent changes, its flexibility changes significantly, and its surface drying performance also deteriorates, indicating that the combination of specific rubber materials has certain specificity for the selection of cross-linking agents, and a large number of experiments are required to verify to obtain a better solution; when phenyl silicone oil is missing or excessive, the surface drying and actual drying time do not change much, but the flexibility deteriorates significantly, indicating that the choice of rubber materials has a more obvious effect on flexibility. The possible reason is that phenyl silicone oil itself has a good high temperature resistance effect. During the continuous high temperature treatment process, it can maintain good toughness, but its dosage should not be too much, which will cause the coating to harden, and its dosage should not be too little, otherwise the coating composed of α, ω-dihydroxy polysiloxane and polydimethylsiloxane will also harden.

Claims

1. An anti-corrosion silicone coating spray, characterized in that: Including α,ω-dihydroxy polysiloxane, polydimethylsiloxane, phenyl silicone oil, fumed silica, crosslinking agent, coupling agent, catalyst, solvent; The weight ratio of the α,ω-dihydroxy polysiloxane, polydimethylsiloxane and phenyl silicone oil is 100:2-10:10-20; The crosslinking agent is composed of vinyl tributylacetoximate silane, methyl tributylacetoximate silane and tetrabutyl ketone oxime silane; The weight ratio of the vinyl tributylacetoximate silane, methyl tributylacetoximate silane and tetrabutyl ketone oxime silane is 1-2:3-7:2-3; The weight ratio of the α,ω-dihydroxy polysiloxane to the crosslinking agent is 100:6-12; The polydimethylsiloxane is composed of low-viscosity polydimethylsiloxane and medium-viscosity polydimethylsiloxane; the weight ratio of the low-viscosity polydimethylsiloxane to the medium-viscosity polydimethylsiloxane is 1 to 5:1; The viscosity of the low-viscosity polydimethylsiloxane is 350±8CS; the viscosity of the medium-viscosity polydimethylsiloxane is 5000±400CS.

2. The anti-corrosion silicone coating spray according to claim 1, characterized in that: The coupling agent is isopropyl triisostearate titanate and / or γ-methacryloxypropyl trimethoxysilane; the weight ratio of the coupling agent to α,ω-dihydroxy polysiloxane is 0.5-1:

100.

3. The anti-corrosion silicone coating spray according to claim 1, characterized in that: The catalyst is dibutyltin dilaurate; the weight ratio of the catalyst to α,ω-dihydroxypolysiloxane is 0.01-0.05:

100.

4. The anti-corrosion silicone coating spray according to claim 1, characterized in that: The solvent is solvent oil; the weight ratio of the solvent oil to α,ω-dihydroxy polysiloxane is 200-300:

100.

5. The anti-corrosion silicone coating spray according to claim 1, characterized in that: The weight ratio of the fumed silica to α,ω-dihydroxy polysiloxane is 20-40:

100.

6. A method for preparing the anticorrosive organosilicon coating spray according to any one of claims 1 to 5, characterized in that: The method is specifically as follows: Add α,ω-dihydroxy polysiloxane, polydimethylsiloxane, phenyl silicone oil and fumed silica into a reactor, and stir and mix under vacuum at 130-140° C. to obtain a base material; The base material, cross-linking agent, coupling agent, catalyst and solvent are mixed, vacuumized and reacted at 60-70°C for 1-2h, and the material is discharged after the reaction is completed.

Images