Anti-sagging epoxy coal tar pitch primer, preparation method and application thereof

Abstract

The application belongs to the field of anticorrosive paint, and discloses an anti-sagging epoxy coal tar primer, a preparation method and application. The primer comprises component A and component B. Component A comprises: composite epoxy resin, modified coal tar, filler, toughening agent, corrosion-resistant agent, anti-sagging agent, solvent and other additives. Component B comprises: curing agent. The anti-sagging epoxy coal tar primer of the application belongs to the thick paste type primer, which can be thickly coated and formed in one time, and also solves the sagging problem after film formation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of anticorrosive paint, more particularly, relates to an anti-sagging epoxy coal tar pitch primer and a preparation method and application thereof. BACKGROUND

[0002] The product standard GB / T 27806-2011 epoxy bitumen anticorrosive paint requires that the sagging property of the thick paste type epoxy bitumen anticorrosive paint must be greater than or equal to 400 microns. The current epoxy coal tar pitch primer is biased towards acid resistance, alkali resistance and other chemical corrosion problems, and ignores the problem of insufficient anti-sagging property, which leads to poor anti-sagging performance after the epoxy coal tar pitch primer is applied to the buried pipeline and bridge, and sometimes even requires secondary construction to solve the sagging problem of the paint.

[0003] Therefore, it is urgent to propose a new anti-sagging epoxy coal tar pitch primer and a preparation method and application thereof. SUMMARY

[0004] The present application aims at the deficiencies of the prior art, and proposes an anti-sagging epoxy coal tar pitch primer and a preparation method and application thereof. The anti-sagging epoxy coal tar pitch primer of the present application belongs to the thick paste type primer, which can be applied once to form a film and solve the problem of sagging after film formation.

[0005] In order to achieve the above-mentioned purpose, the present application provides an anti-sagging epoxy coal tar pitch primer in the first aspect, which comprises component A and component B.

[0006] The component A comprises: composite epoxy resin, modified coal tar pitch, filler, toughening agent, corrosion resistant agent, anti-sagging agent, solvent and other additives.

[0007] The component B comprises: curing agent.

[0008] In the present application, the component A is the paint component. According to the present application, preferably, the component A comprises: composite epoxy resin 35-60%, modified coal tar pitch 15-25%, filler 3-10%, toughening agent 1-5%, corrosion resistant agent 10-20%, anti-sagging agent 0.1-5%, solvent 5-15% and other additives 0.5-2.5%, based on the total weight of the component A, and the sum of the above components is 100%. Further preferably, the component A comprises: composite epoxy resin 35-45%, modified coal tar pitch 15-25%, filler 5-10%, toughening agent 1-3%, corrosion resistant agent 10-16%, anti-sagging agent 0.1-1%, solvent 5-15% and other additives 1.5-2.5%, based on the total weight of the component A, and the sum of the above components is 100%.

[0009] According to the present application, preferably, the composite epoxy resin is a mixture of a type II water-based epoxy emulsion with an epoxy equivalent of 500-550 and a bisphenol F type epoxy resin (solvent type epoxy resin, glycidyl ether type) with an epoxy equivalent of 160-180, and the mass ratio of the type II water-based epoxy emulsion with an epoxy equivalent of 500-550 to the bisphenol F type epoxy resin with an epoxy equivalent of 160-180 is (0.5-3.5):(2-5).

[0010] In the present application, the composite epoxy resin combines the advantages of easy control of the water-based epoxy resin coating film thickness and good weather resistance of the solvent type epoxy resin.

[0011] According to the present application, preferably, the filler is at least one of stone powder, heavy calcium carbonate and light calcium carbonate.

[0012] According to the present application, preferably, the toughening agent is polyamide acid (PAA) and / or polyimide (PI).

[0013] According to the present application, preferably, the corrosion resistant agent is at least one of chloroester rubber, silicone rubber and hydrogenated nitrile rubber.

[0014] According to the present application, preferably, the anti-sagging agent is a water-based polyamide anti-settling wax with a pH value of 8.0-9.0.

[0015] According to the present application, preferably, the solvent is at least one of dimethylbenzene, diethyl ether and carbon tetrachloride.

[0016] According to the present application, preferably, the other auxiliary agent is an anti-aging agent and / or a leveling agent; preferably, the other auxiliary agent is a mixture of an anti-aging agent and a leveling agent, and the mass ratio of the anti-aging agent to the leveling agent is 1:(1.5-2.5).

[0017] According to the present application, preferably, the modified coal tar pitch is obtained by mixing and high-temperature modification of coal tar pitch, petroleum pitch and SBS modifier.

[0018] The present application is to modify coal tar pitch, so that the obtained modified coal tar pitch has the characteristics of not flowing at high temperature and not cracking at low temperature, and the performance defects of coal tar pitch are improved, and then the sagging property of the anti-sagging epoxy coal tar pitch primer after film formation reaches 600-800 mu, the heat resistance is greater than or equal to 80 DEG C, and the low temperature flexibility is less than or equal to -20 DEG C, and the problem of sagging property of the coating material is solved.

[0019] According to the present application, preferably, the content of the coal tar pitch is 8-12%, the content of the petroleum pitch is 10-20%, and the content of the SBS modifier is 1-2%, based on the total weight of the A component.

[0020] According to the present application, preferably, the coal pitch is No. 2 medium temperature coal pitch with a softening point of 75-95 DEG C.

[0021] According to the present application, preferably, the petroleum pitch is No. 200 pitch with a penetration of 200-300 1 / 10mm at 25 DEG C.

[0022] According to the present application, preferably, the SBS modifier is at least one of linear SBS 1301-1, SBS 1401 and KRATON D1101.

[0023] According to the present application, preferably, the preparation method of the modified coal pitch comprises:

[0024] S1: heating and stirring the petroleum pitch;

[0025] S2: mixing and heating and stirring the coal pitch with the petroleum pitch heated and stirred in step S1 to obtain an asphalt mixture;

[0026] S3: mixing and stirring the SBS modifier with the asphalt mixture until the SBS modifier particles are completely dissolved to obtain the modified coal pitch, and keeping warm for use.

[0027] According to the present application, preferably, in step S1, the heating and stirring temperature is 120-130 DEG C and the time is 0.8-1.2h.

[0028] According to the present application, preferably, in step S2, the heating and stirring temperature is 150-180 DEG C and the time is 0.4-0.6h.

[0029] According to the present application, preferably, in step S3, the stirring time is 0.8-1.2h and the temperature of the modified coal pitch is kept at 100-110 DEG C.

[0030] In the present application, the stirring in steps S1-S3 is all high-speed stirring with a stirring speed of 700-920 rpm.

[0031] According to the present application, preferably, the curing agent is at least one of ethylenediamine, diethylenetriamine and triethylenetetramine.

[0032] In the present application, the curing agent can cross-link and cure the composite epoxy resin at room temperature.

[0033] According to the present application, preferably, the amount ratio of the A component to the B component is (2-8):1.

[0034] The second aspect of the present application provides a preparation method of the anti-sagging epoxy coal pitch primer, and the preparation method comprises the following steps:

[0035] (1) mixing and stirring the modified coal pitch, corrosion-resistant agent, composite epoxy resin, filler, solvent, toughening agent, anti-sagging agent and other additives uniformly to obtain the A component;

[0036] (2) stirring the curing agent to obtain the B component.

[0037] In the present application, as a preferred scheme, the preparation method of the anti-sagging epoxy coal pitch primer comprises:

[0038] The prepared modified coal pitch with a temperature of 100-110 DEG C and corrosion-resistant agent and composite epoxy resin are added into a reaction container and stirred at a medium speed for 1-2 hours until the temperature is reduced to 40-45 DEG C;

[0039] The filler and solvent are further added into the reaction container and stirred at a low speed for 0.5 hours;

[0040] Finally, the toughening agent, anti-sagging agent and other additives are added into the reaction container and stirred at a medium speed for 1 hour to obtain the A component.

[0041] Further preferably, the stirring speed of the medium speed stirring is 500-680 rpm, and the stirring speed of the low speed stirring is 200-470 rpm.

[0042] The third aspect of the present application provides the application of the anti-sagging epoxy coal pitch primer in the construction of buried pipelines and / or bridge primers.

[0043] The beneficial effects of the technical scheme of the present application are as follows:

[0044] The anti-sagging epoxy coal pitch primer prepared by the present application is mainly used for the construction of anticorrosive coating primer of buried pipelines, bridges and the like, and the sagging property of the paint film can reach 600-800 microns, which can solve the defect of sagging of the paint film after drying of the traditional epoxy coal pitch primer in the high temperature season. The construction mode of the anti-sagging epoxy coal pitch primer prepared by the present application can be spraying and rolling, and drying is fast.

[0045] The anti-sagging epoxy coal pitch primer prepared by the present application is composed of A and B components. The curing agent of the B component is mixed and stirred with the A component in proportion, and a curing reaction can occur at room temperature without consuming heat energy for heating, and the film can be formed by one-thick coating, which is convenient for construction.

[0046] Other features and advantages of the present application will be described in detail in the following specific embodiments. DETAILED DESCRIPTION

[0047] Preferred embodiments of the present application will be described in more detail below. Although the following describes preferred embodiments of the present application, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present application will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0048] In the following various embodiments:

[0049] The coal tar pitch is No. 2 medium temperature coal tar pitch with a softening point of 75-95°C;

[0050] The petroleum pitch is No. 200 pitch with a penetration of 200-300 1 / 10 mm at 25°C;

[0051] The SBS modifier is linear SBS 1301-1;

[0052] The anti-sagging agent is water-based polyamide anti-settling wax Dowsen WSP-900 with a pH value of 8.0-9.0;

[0053] The solvent is xylene;

[0054] The other auxiliary agent is an anti-aging agent BLE-W (high-temperature condensate of acetone and diphenylamine) with a CAS number of 68412-48-6 and a leveling agent (modified organopolysilane) with a CAS number of 105-11-3, which are mixed in a ratio of 1:2.

[0055] Example 1

[0056] The present embodiment provides an anti-sagging epoxy coal tar pitch primer, which comprises a component A and a component B; the amount ratio of the component A and the component B is 4:1;

[0057] The component A comprises, based on the total weight of the component A: 40% of a composite epoxy resin, 22% of a modified coal tar pitch, 9% of stone powder, 2% of polyamide acid, 15% of silicone rubber, 1% of an anti-sagging agent, 10% of a solvent, and 1% of other auxiliary agents, with the sum of the above components being 100%.

[0058] The composite epoxy resin is a mixture of a type II water-based epoxy emulsion with an epoxy equivalent weight of 500-550 and a bisphenol F type epoxy resin with an epoxy equivalent weight of 160-180, and the mass ratio of the type II water-based epoxy emulsion with an epoxy equivalent weight of 500-550 to the bisphenol F type epoxy resin with an epoxy equivalent weight of 160-180 is 1.8:2;

[0059] The preparation method of the modified coal tar pitch comprises:

[0060] S1: heat to 120-130°C and stir the petroleum pitch at high speed for 1 h;

[0061] S2: heating to 150-180℃, mixing the coal tar with the petroleum pitch after step S1 and stirring at high speed for 0.5h to obtain a pitch mixture;

[0062] S3: mixing the SBS modifier with the pitch mixture and stirring at high speed for 1h to obtain the modified coal tar, the temperature being kept at 100-110℃. The stirring speed of the high speed stirring is 700-920rpm.

[0063] The content of the coal tar is 8%, the content of the petroleum pitch is 13%, and the content of the SBS modifier is 1%, based on the total weight of the A component;

[0064] The B component is a curing agent, and the curing agent includes ethylenediamine 60% and diethylenetriamine 40%, based on the total weight of the curing agent.

[0065] The preparation method of the anti-sagging epoxy coal tar primer includes the following steps:

[0066] The prepared modified coal tar with a temperature of 100-110℃, corrosion-resistant agent and composite epoxy resin are added into a reaction container and mixed and stirred at a medium speed for 1h-2h until the temperature is lowered to 40-45℃;

[0067] Fillers and solvents are further added into the reaction container and stirred at a low speed for 0.5h;

[0068] Finally, toughening agents, anti-sagging agents and other additives are added into the reaction container and stirred at a medium speed for 1h to obtain the A component.

[0069] Ethylenediamine is stirred at a low speed for 0.1h; diethylenetriamine is mixed with the ethylenediamine after the low speed stirring and stirred at a low speed for 0.1h to obtain the B component.

[0070] The stirring speed of the medium speed stirring is 500-680rpm, and the stirring speed of the low speed stirring is 200-470rpm.

[0071] Example 2

[0072] The present embodiment provides an anti-sagging epoxy coal tar primer, which includes an A component and a B component; the use amount ratio of the A component and the B component is 5:1.

[0073] The A component includes composite epoxy resin 42%, modified coal tar 21.5%, heavy calcium carbonate 5%, polyimide 3%, chloroester rubber 16%, anti-sagging agent 0.5%, solvent 11% and other additives 1%, based on the total weight of the A component, and the sum of the above components is 100%.

[0074] The composite epoxy resin is a mixture of II type water-based epoxy emulsion with an epoxy equivalent of 500-550 and bisphenol F type epoxy resin with an epoxy equivalent of 160-180, and the mass ratio of the II type water-based epoxy emulsion with an epoxy equivalent of 500-550 to the bisphenol F type epoxy resin with an epoxy equivalent of 160-180 is 3.2:2.9.

[0075] The preparation method of the modified coal tar pitch is the same as that of Example 1, and the content of the coal tar pitch is 8%, the content of the petroleum pitch is 12%, and the content of the SBS modifier is 1.5% based on the total weight of the A component.

[0076] The B component is a curing agent, and the curing agent includes 50% of ethylenediamine and 50% of triethylenetetramine based on the total weight of the curing agent.

[0077] The preparation method of the anti-sagging epoxy coal tar pitch primer is the same as that of Example 1.

[0078] Example 3

[0079] The anti-sagging epoxy coal tar pitch primer provided in this example includes an A component and a B component, and the use amount ratio of the A component to the B component is 6:1.

[0080] The A component includes 43% of a composite epoxy resin, 20% of a modified coal tar pitch, 5% of light calcium carbonate, 2.5% of polyamide acid, 15% of hydrogenated butyronitrile glue, 0.5% of an anti-sagging agent, 12% of a solvent, and 2% of other auxiliaries based on the total weight of the A component, and the sum of the above components is 100%.

[0081] The composite epoxy resin is a mixture of II type water-based epoxy emulsion with an epoxy equivalent of 500-550 and bisphenol F type epoxy resin with an epoxy equivalent of 160-180, and the mass ratio of the II type water-based epoxy emulsion with an epoxy equivalent of 500-550 to the bisphenol F type epoxy resin with an epoxy equivalent of 160-180 is 3.3:3.

[0082] The preparation method of the modified coal tar pitch is the same as that of Example 1, and the content of the coal tar pitch is 9%, the content of the petroleum pitch is 10%, and the content of the SBS modifier is 1% based on the total weight of the A component.

[0083] The B component is a curing agent, and the curing agent includes 80% of ethylenediamine and 20% of diethylenetriamine based on the total weight of the curing agent.

[0084] The preparation method of the anti-sagging epoxy coal tar pitch primer is the same as that of Example 1.

[0085] Example 4

[0086] The embodiment provides an anti-sagging epoxy coal tar primer, which comprises an A component and a B component; the A component and the B component are in a ratio of 4:1 in terms of amount;

[0087] The A component comprises, in terms of total weight of the A component: 48.5% of a composite epoxy resin, 19% of modified coal tar, 5% of stone powder, 1% of polyamide acid, 15% of chloroester rubber, 0.5% of an anti-sagging agent, 10% of a solvent and 1% of other auxiliaries, and the sum of the above components is 100%.

[0088] The composite epoxy resin is a mixture of II type water-based epoxy emulsion with an epoxy equivalent of 500-550 and bisphenol F type epoxy resin with an epoxy equivalent of 160-180, and the mass ratio of the II type water-based epoxy emulsion with an epoxy equivalent of 500-550 to the bisphenol F type epoxy resin with an epoxy equivalent of 160-180 is 3.5:4.6.

[0089] The preparation method of the modified coal tar is the same as that in embodiment 1; the content of the coal tar is 8%, the content of the petroleum pitch is 10% and the content of the SBS modifier is 1% in terms of total weight of the A component.

[0090] The B component is a curing agent, and the curing agent comprises, in terms of total weight of the curing agent: 50% of diethylene triamine and 50% of triethylene tetramine.

[0091] The preparation method of the anti-sagging epoxy coal tar primer is the same as that in embodiment 1.

[0092] Test example

[0093] The anti-sagging epoxy coal tar primer in embodiments 1-4 is subjected to performance testing according to the method in GB / T 27806-2011 Epoxy Tar Anticorrosive Coatings and JC / T408-2005 Water Emulsion Tar Waterproof Coatings, and the results are shown in Table 1.

[0094] Table 1

[0095]

[0096] The above has described the embodiments of the present application, and the above description is exemplary, is not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An anti-sagging epoxy coal tar pitch primer, characterized by, The primer comprises component A and component B; Component A includes: composite epoxy resin, modified coal tar pitch, filler, toughening agent, corrosion resistant agent, anti-sagging agent, solvent and other additives; The composite epoxy resin is a mixture of a type II waterborne epoxy emulsion with an epoxy equivalent of 500-550 and a bisphenol F type epoxy resin with an epoxy equivalent of 160-180. The modified coal tar pitch is prepared by mixing coal tar pitch, petroleum tar pitch and SBS modifier and modifying them at high temperature. Component B includes: a curing agent.

2. The anti-sagging epoxy coal tar primer according to claim 1, wherein, Based on the total weight of component A, component A comprises: 35-60% composite epoxy resin, 15-25% modified coal tar pitch, 3-10% filler, 1-5% toughening agent, 10-20% corrosion resistant agent, 0.1-5% anti-sagging agent, 5-15% solvent, and 0.5-2.5% other additives, the sum of which is 100%.

3. The anti-sagging epoxy coal tar primer according to claim 2, wherein, Based on the total weight of component A, component A comprises: 35-45% composite epoxy resin, 15-25% modified coal tar pitch, 5-10% filler, 1-3% toughening agent, 10-16% corrosion resistant agent, 0.1-1% anti-sagging agent, 5-15% solvent, and 1.5-2.5% other additives, the sum of which is 100%.

4. The anti-sagging epoxy coal tar primer according to any one of claims 1-3, wherein, The mass ratio of the type II waterborne epoxy emulsion with an epoxy equivalent of 500-550 to the bisphenol F type epoxy resin with an epoxy equivalent of 160-180 is (0.5-3.5):(2-5). The filler is at least one of stone powder, heavy calcium carbonate, and light calcium carbonate; The toughening agent is polyamic acid and / or polyimide; The corrosion resistant agent is at least one of chlorinated rubber, silicone rubber and hydrogenated nitrile rubber; The anti-sagging agent is a water-based polyamide anti-settling wax with a pH value of 8.0-9.0; The solvent is at least one of xylene, diethyl ether, and carbon tetrachloride; The other additives are anti-aging agents and / or leveling agents.

5. The anti-sagging epoxy coal tar primer according to claim 4, wherein, The other additives are a mixture of anti-aging agents and leveling agents, wherein the mass ratio of the anti-aging agent to the leveling agent is 1:(1.5-2.5).

6. The anti-sagging epoxy coal tar primer according to claim 4, wherein, Based on the total weight of component A, the content of coal tar pitch is 8-12%, the content of petroleum asphalt is 10-20%, and the content of SBS modifier is 1-2%. The coal tar pitch is No. 2 medium-temperature coal tar pitch with a softening point of 75-95℃. The petroleum asphalt is No. 200 asphalt with a penetration of 200-300 1 / 10 mm at 25℃; The SBS modifier is at least one of linear SBS 1301-1, SBS 1401, and KRATON D1101; The method for preparing the modified coal tar pitch includes: S1: Heat and stir the petroleum asphalt; S2: Mix the coal tar pitch with the petroleum asphalt heated and stirred in step S1, and then heat and stir the mixture to obtain an asphalt mixture; S3: Mix the SBS modifier with the asphalt mixture to obtain the modified coal tar pitch.

7. The anti-sagging epoxy coal tar primer according to claim 6, wherein, In step S1, the heating and stirring temperature is 120-130℃, and the time is 0.8-1.2h; In step S2, the heating and stirring temperature is 150-180℃, and the time is 0.4-0.6h; In step S3, the stirring time is 0.8-1.2 hours.

8. The anti-sagging epoxy coal tar primer according to claim 1, wherein, The curing agent is at least one of ethylenediamine, diethylenetriamine, and triethylenetetramine.

9. The anti-sagging epoxy coal tar primer according to claim 1, wherein, The ratio of component A to component B is (2-8):

1.

10. The method for preparing the anti-sagging epoxy coal tar primer according to any one of claims 1-9, characterized in that, The preparation method includes the following steps: (1) Mix the modified coal tar pitch, corrosion resistant agent, composite epoxy resin, filler, solvent, toughening agent, anti-sagging agent and other additives evenly to obtain component A; (2) Stir the curing agent to obtain component B.

11. The application of the anti-sagging epoxy coal tar primer according to any one of claims 1-9 in the primer application of buried pipelines and / or bridges.

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