Epoxy asphalt anticorrosive coating for steel structure and preparation method thereof

Abstract

This invention discloses an epoxy asphalt anticorrosion coating for steel structures and its preparation method. The anticorrosion coating includes component A and component B. Component A includes asphalt, epoxy resin, diluent, oiliness agent, and optional filler. Component B is a modified polyetheramine curing agent. The modified polyetheramine curing agent is prepared by a method including the following steps: (1) reacting polyethylene glycol and p-toluenesulfonyl chloride in the presence of a first organic solvent and a catalyst; (2) contacting and reacting the reaction solution obtained in step (1) with ethylenediamine in the presence of a protective gas and a second organic solvent to obtain polyoxyethylene polyamine; (3) reacting polyoxyethylene polyamine, phenol, and formaldehyde aqueous solution to obtain the modified polyetheramine curing agent. This invention improves the impact resistance, bending resistance, and chemical resistance of the coating by adding the modified polyetheramine curing agent; it can be applied at 5-35℃.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of anticorrosive paint, more particularly, relates to an epoxy asphalt anticorrosive paint for steel structure and a preparation method thereof. BACKGROUND

[0002] After the polymerization reaction of epoxy resin with a curing agent, a three-dimensional structure can be formed, which contains stable carbon-carbon bonds and ether bonds on the molecular chain, has a dense structure, excellent impermeability after curing, and water resistance, oil resistance, chemical corrosion resistance, etc. Asphalt has good water resistance and low price, and has good miscibility with epoxy resin, so this type of paint has been widely used in chemical equipment, water conservancy engineering, and inner and outer wall coating of underground pipelines.

[0003] Aliphatic amine curing agent is one of the most widely used curing agents, which has good compatibility with epoxy resin and can cure the resin at room temperature. However, due to the short chain and small molecule of aliphatic amine curing agent, the cured resin has high brittleness, poor impact resistance and bending performance, which causes the paint to crack easily under stress, thereby losing the anticorrosion function. The polyether amine curing agent greatly enhances the flexibility and toughness of the cured product. However, the traditional polyether amine curing agent has a large molecular weight, slow curing speed, and needs to be reacted at a high temperature, so the construction period is slow at room temperature and low temperature. SUMMARY

[0004] The present application aims to solve the problems existing in the prior art, and provides an epoxy asphalt anticorrosive paint for steel structure and a preparation method thereof. The present application adds a modified polyether amine curing agent to improve the impact resistance, bending resistance and chemical resistance of the paint, and the paint can be constructed at 5-35℃.

[0005] To achieve the above-mentioned purpose, one aspect of the present application provides an epoxy asphalt anticorrosive paint for steel structure, which comprises component A and component B.

[0006] The component A comprises asphalt, epoxy resin, diluent, oil agent and optional filler.

[0007] The component B is a modified polyether amine curing agent.

[0008] The modified polyether amine curing agent is prepared by a preparation method comprising the following steps:

[0009] (1) reacting polyethylene glycol and p-toluenesulfonyl chloride in the presence of a first organic solvent and a catalyst;

[0010] (2) contacting and reacting the reaction liquid obtained in step (1) with ethylenediamine in the presence of a protective gas and a second organic solvent to obtain a polyoxyethylene polyamine.

[0011] (3) reacting the polyoxyethylene polyamine, phenol and aqueous formaldehyde solution to obtain the modified polyether amine curing agent.

[0012] According to the application, preferably, the first organic solvent is tetrahydrofuran; the catalyst is pyridine; the weight average molecular weight of the polyethylene glycol is 200-250;

[0013] The second organic solvent is toluene;

[0014] The aqueous formaldehyde solution has a mass concentration of 37-38%.

[0015] According to the application, preferably, in step (1): the temperature of the reaction is 15-30℃, and the time is 36-48h; the molar ratio of the polyethylene glycol to the p-toluenesulfonyl chloride is 1:2-2.5; the molar ratio of the catalyst to the polyethylene glycol is 1:13-14;

[0016] In step (2): the temperature of the reaction is 100-150℃; the molar ratio of the p-toluenesulfonyl chloride to the ethylenediamine is 1:1-1.2;

[0017] In step (3): the temperature of the reaction is 80-90℃; the molar ratio of the polyoxyethylene polyamine to the phenol is 1:1-3, and the molar ratio of the polyoxyethylene polyamine to the formaldehyde is 1:0.8-1.2;

[0018] After the reaction is completed, vacuum dehydration and distillation are performed to obtain the modified polyether amine curing agent.

[0019] In the application, preferably, in step (2): the time for adding the reaction product obtained in step (1) into the reaction system is 2.0-2.5h, and after the addition is completed, the reaction is continued for 1-4h; after the reaction is completed, the solvent is removed by distillation to obtain the modified polyether amine curing agent.

[0020] In the application, preferably, in step (3), the aqueous formaldehyde solution is added dropwise into the reaction system, and the dropwise addition is completed in 1-2h; after the dropwise addition is completed, the reaction is continued for 3-5h.

[0021] In the application, as a preferred embodiment, the modified polyether amine curing agent is prepared by a preparation method comprising the following steps:

[0022] S1, polyethylene glycol and p-toluenesulfonyl chloride are added into a reaction kettle containing tetrahydrofuran solvent, pyridine is added dropwise while stirring, the temperature is adjusted to 15-30℃, and the stirring is continued for 36-48h;

[0023] S2, under N2 protection, the reaction liquid obtained in step S1 is dropped into a mixed solution of toluene and ethylenediamine, the dropping is completed in 2.0-2.5 h, after the dropping is completed, the stirring is continued for 1-4 h,

[0024] S3, after distillation at 110℃, the polyoxyethylene polyamine is obtained after drying;

[0025] S4, the polyoxyethylene polyamine is loaded into a reactor with a reflux condenser, phenol is added, the temperature is raised to 80-90℃, the aqueous formaldehyde solution is slowly dropped, the dropping is completed in 1-2 h, after the dropping is completed, the stirring is continued for 3-5 h;

[0026] S5, vacuum dehydration, distillation at 120℃.

[0027] The stirring speed is preferably 300-600 rpm.

[0028] According to the present application, preferably, the pitch is at least one of petroleum pitch, coal pitch and modified petroleum pitch;

[0029] The epoxy resin is at least one of bisphenol A type epoxy resin, bisphenol F type epoxy resin, polyphenol type glycidyl ether epoxy resin, aliphatic glycidyl ether epoxy resin and glycidyl ester type epoxy resin;

[0030] The filler is at least one of calcium carbonate, barium sulfate, titanium dioxide, quartz powder, mica powder, talc powder and bentonite.

[0031] According to the present application, preferably, the diluent is an active diluent and / or an inactive diluent;

[0032] The active diluent is preferably at least one of n-butyl glycidyl ether, allyl glycidyl ether and phenyl glycidyl ether;

[0033] The inactive diluent is preferably at least one of benzyl alcohol, benzene, toluene and xylene.

[0034] According to the present application, preferably, the pitch is 15-50 wt%, the epoxy resin is 10-50 wt%, the diluent is 5-15 wt%, the oil agent is 10-20 wt%, and the filler is 0-60 wt%, based on the total weight of the A component.

[0035] According to the present application, preferably, the mass ratio of the A component to the B component is 100:5-25.

[0036] Another aspect of the present application provides a preparation method of the epoxy pitch anticorrosive coating for steel structure, the preparation method comprising:

[0037] Preparation of component A: The epoxy resin, diluent and oiliness agent are stirred and mixed, then the asphalt is added and stirred and mixed, and optionally the filler is added last and stirred and mixed to obtain component A;

[0038] Preparation of component B: (1) Polyethylene glycol and p-toluenesulfonyl chloride are reacted in the presence of a first organic solvent and a catalyst;

[0039] (2) In the presence of a protective gas and a second organic solvent, the reaction solution obtained in step (1) is brought into contact with and reacted with ethylenediamine to obtain polyoxyethylene polyamine;

[0040] (3) The polyoxyethylene polyamine, phenol and formaldehyde aqueous solution are reacted to obtain the modified polyetheramine curing agent.

[0041] According to the present invention, preferably, in the preparation of component A: the asphalt is added at 60-80°C and stirred and mixed.

[0042] In this invention, the stirring speed for mixing epoxy resin, diluent and oiliness agent is preferably 500-1000 rpm, and the stirring speed for adding asphalt is preferably 300-500 rpm.

[0043] In a preferred embodiment of this invention, the preparation method of component A includes the following steps: adding epoxy resin to a reaction vessel, adding a diluent and an oiling agent under stirring conditions, completing the addition in 0.5–1.5 hours, stirring for 1.5–2.5 hours, adjusting the temperature to 60–80°C, adding asphalt under stirring, continuing stirring for 0.5–1 hour, optionally adding filler while stirring, continuing stirring for 3–5 hours, and filtering to obtain component A. Preferably, the filter mesh size for the filtered material is 80 μm.

[0044] In this invention, component A and component B are mixed and used together during application.

[0045] The present invention does not limit the source of the raw materials used. Unless otherwise specified, the raw materials used in the present invention are all commercially available products in this technical field.

[0046] The technical solution of the present invention has the following beneficial effects:

[0047] (1) This invention synthesizes a modified polyetheramine curing agent in two steps. First, a low molecular weight polyetheramine curing agent (polyoxyethylene polyamine) with polyamines at both ends is synthesized, which enhances the internal crosslinking degree of the coating. Subsequently, the low molecular weight polyetheramine curing agent is modified by the Mannich reaction, which further improves the low-temperature curing performance of the coating and enhances the chemical resistance and salt spray resistance of the coating.

[0048] (2) By adding the modified polyetheramine curing agent synthesized in this invention, the coating exhibits excellent internal crosslinking properties, enhancing the toughness and durability of the coating. Further modification through the Mannich reaction significantly improves the curing speed of the coating under low-temperature conditions, allowing the coating to be applied in a temperature range of 5–35°C.

[0049] (3) The epoxy asphalt anticorrosion coating for steel structures of the present invention adopts a solvent-free system, which has the characteristics of high solid content and low VOC content, and meets the requirements of green environmental protection.

[0050] Other features and advantages of the present invention will be described in detail in the following detailed description section. Detailed Implementation

[0051] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0052] The present invention is further illustrated by the following examples:

[0053] In the following examples and comparative examples: PEG-200 represents polyethylene glycol with a weight-average molecular weight of 200, and PEG-250 represents polyethylene glycol with a weight-average molecular weight of 250.

[0054] The concentrations of the formaldehyde aqueous solutions used are all expressed as mass concentrations.

[0055] Example 1

[0056] Preparation of modified polyetheramine curing agent: (1) Add 100g polyethylene glycol (PEG-200) and 200g p-toluenesulfonyl chloride to a reaction vessel containing 500mL tetrahydrofuran solvent, add 3g pyridine dropwise while stirring at 300rpm, adjust the temperature to 15℃, and continue stirring for 36h; (2) Under N2 protection, raise the temperature to 100℃, and dropwise add the reaction solution obtained in step (1) into a mixed solution of 500mL toluene and 70mL ethylenediamine. (2) The addition was completed in 2.0h, and after the addition was completed, the mixture was stirred for 1h. (3) Polyoxyethylene polyamine was obtained by distillation at 110℃. (4) 100g of polyoxyethylene polyamine was loaded into a reactor with a reflux condenser, 47g of phenol was added, the temperature was raised to 80℃, and 40.5g of 37% formaldehyde aqueous solution was slowly added dropwise. The addition was completed in 1h, and after the addition was completed, the mixture was stirred for 3h. (5) Vacuum dehydration and distillation at 120℃ were performed to obtain the modified polyetheramine curing agent.

[0057] Preparation of epoxy asphalt anticorrosion coating for steel structure: (1) Add 100g of epoxy resin to the reaction vessel, add 50g of diluent and 100g of oiliness agent under stirring, and complete the feeding in 0.5h; continue stirring for 1.5h, adjust the temperature to 60℃, add 150g of asphalt under stirring, and continue stirring for 0.5h; add 600g of filler while stirring, continue stirring for 3h, filter out the material to obtain component A; wherein, the asphalt is coal tar pitch, the epoxy resin is aliphatic glycidyl ether epoxy resin, the filler is barium sulfate, the diluent is xylene, and the oiliness agent is aromatic oil;

[0058] (2) Component B is the above-mentioned modified polyetheramine curing agent;

[0059] When using, mix component A and component B at a mass ratio of 100:5, and then apply the mixture to the substrate surface.

[0060] Example 2

[0061] Preparation of modified polyetheramine curing agent: (1) Add 125g polyethylene glycol (PEG-250) and 237g p-toluenesulfonyl chloride to a reaction vessel containing 500mL tetrahydrofuran solvent, add 3g pyridine dropwise while stirring at 500rpm, adjust the temperature to 30℃, and continue stirring for 48h; (2) Under N2 protection, raise the temperature to 150℃, and dropwise add the reaction solution obtained in step (1) into a mixed solution of 500mL toluene and 83mL ethylenediamine. , 2.5h to complete the addition, after the addition is completed, continue stirring for 4h; (3) distill at 110℃ to obtain polyoxyethylene polyamine; (4) put 125g of polyoxyethylene polyamine into a reactor with a reflux condenser, add 15.7g of phenol, heat to 80℃, slowly add 40.5g of 37% formaldehyde aqueous solution, complete the addition in 1h, after the addition is completed, continue stirring for 5h; (5) vacuum dehydration, distill at 120℃ to obtain the modified polyetheramine curing agent.

[0062] Preparation of epoxy asphalt anticorrosion coating for steel structure: (1) Add 300g of epoxy resin to the reactor, add 150g of diluent and 200g of oiling agent under stirring, and complete the feeding in 1.5h; continue stirring for 2.5h, adjust the temperature to 80℃, add 350g of asphalt under stirring, and continue stirring for 1h; filter out the material to obtain component A; wherein, the asphalt is petroleum asphalt, the epoxy resin is bisphenol A type epoxy resin, the diluent is n-butyl glycidyl ether, and the oiling agent is aromatic oil;

[0063] (2) Component B is the above-mentioned modified polyetheramine curing agent;

[0064] When using, mix component A and component B at a mass ratio of 100:15, and then apply the mixture to the substrate surface.

[0065] Example 3

[0066] Preparation of modified polyetheramine curing agent: (1) Add 100g polyethylene glycol (PEG-200) and 220g p-toluenesulfonyl chloride to a reaction vessel containing 500mL tetrahydrofuran solvent, add 3g pyridine dropwise while stirring at 400rpm, adjust the temperature to 20℃, and continue stirring for 36h; (2) Under N2 protection, raise the temperature to 110℃, and dropwise add the reaction solution obtained in step (1) into a mixed solution of 500mL toluene and 77mL ethylenediamine. (2) Add the polyoxyethylene polyamine by distillation at 10°C for 2 hours. After the addition is complete, stir continuously for 3 hours. (3) Obtain polyoxyethylene polyamine by distillation at 10°C. (4) Put 100g of polyoxyethylene polyamine into a reactor with a reflux condenser, add 23.5g of phenol, heat to 85°C, slowly add 40.5g of 37% formaldehyde aqueous solution, complete the addition in 1.5 hours, and stir continuously for 4 hours after the addition is complete. (5) Dehydrate under vacuum, distill at 120°C to obtain the modified polyetheramine curing agent.

[0067] Preparation of epoxy asphalt anticorrosion coating for steel structure: (1) Add 500g of epoxy resin to the reactor, add 50g of diluent and 150g of oiliness agent under stirring, and complete the feeding in 1h; continue stirring for 2h, adjust the temperature to 70℃, add 200g of asphalt under stirring, and continue stirring for 1h; add 100g of filler while stirring, continue stirring for 4h, filter and discharge to obtain component A; wherein, the asphalt is coal tar pitch, the epoxy resin is bisphenol F type epoxy resin, the filler is mica powder, the diluent is benzyl alcohol, and the oiliness agent is aromatic oil;

[0068] (2) Component B is the above-mentioned modified polyetheramine curing agent;

[0069] When using, mix component A and component B at a mass ratio of 100:25, and then apply the mixture to the substrate surface.

[0070] Comparative Example 1

[0071] Preparation of modified polyetheramine curing agent: (1) 1000g of polyetheramine D-2000 was loaded into a reactor with a reflux condenser, 15.7g of phenol was added, the temperature was raised to 80℃, and 40.5g of 37% formaldehyde aqueous solution was slowly added dropwise. The addition was completed in 1.5h. After the addition was completed, the mixture was stirred for 5h. (5) Vacuum dehydration and distillation at 120℃ were performed to obtain the modified polyetheramine curing agent.

[0072] Preparation of epoxy asphalt anticorrosion coating for steel structure: (1) Add 300g of epoxy resin to the reactor, add 150g of diluent and 200g of oiling agent under stirring, and complete the feeding in 1.5h; continue stirring for 2.5h, adjust the temperature to 80℃, add 350g of asphalt under stirring, and continue stirring for 1h; filter out the material to obtain component A; wherein, the asphalt is petroleum asphalt, the epoxy resin is bisphenol A type epoxy resin, the diluent is n-butyl glycidyl ether, and the oiling agent is aromatic oil;

[0073] (2) Component B is the above-mentioned modified polyetheramine curing agent;

[0074] When using, mix component A and component B at a mass ratio of 100:15, and then apply the mixture to the substrate surface.

[0075] Comparative Example 2

[0076] Preparation of modified polyetheramine curing agent: (1) Add 125g polyethylene glycol (PEG-250) and 237g p-toluenesulfonyl chloride to a reaction vessel containing 500mL tetrahydrofuran solvent, add 3g pyridine dropwise while stirring at 500rpm, adjust the temperature to 30℃, and continue stirring for 48h; (2) Under N2 protection, heat to 150℃, add the resulting liquid dropwise to a mixed solution of 500mL toluene and 83mL ethylenediamine, complete the dropwise addition in 2.5h, and continue stirring for 4h after the dropwise addition is completed; (3) Vacuum dehydration, distillation at 120℃ to obtain the modified polyetheramine curing agent.

[0077] Preparation of epoxy asphalt anticorrosion coating for steel structure: (1) Add 300g of epoxy resin to the reactor, add 150g of diluent and 200g of oiling agent under stirring, and complete the feeding in 1.5h; continue stirring for 2.5h, adjust the temperature to 80℃, add 350g of asphalt under stirring, and continue stirring for 1h; filter out the material to obtain component A; wherein, the asphalt is petroleum asphalt, the epoxy resin is bisphenol A type epoxy resin, the diluent is n-butyl glycidyl ether, and the oiling agent is aromatic oil;

[0078] (2) Component B is the above-mentioned modified polyetheramine curing agent;

[0079] When using, mix component A and component B at a mass ratio of 100:15, and then apply the mixture to the substrate surface.

[0080] Comparative Example 3

[0081] Preparation of epoxy asphalt anticorrosion coating for steel structure: (1) Add 300g of epoxy resin to the reactor, add 150g of diluent and 200g of oiling agent under stirring, and complete the feeding in 1.5h; continue stirring for 2.5h, adjust the temperature to 80℃, add 350g of asphalt under stirring, and continue stirring for 1h; filter out the material to obtain component A; wherein, the asphalt is petroleum asphalt, the epoxy resin is bisphenol A type epoxy resin, the diluent is n-butyl glycidyl ether, and the oiling agent is aromatic oil;

[0082] (2) Component B is m-xylenediamine;

[0083] When using, mix component A and component B at a mass ratio of 100:15, and then apply the mixture to the substrate surface.

[0084] The waterproof layers obtained in the examples and comparative examples were tested for drying time, impact resistance, bending test, alkali resistance, acid resistance, salt water resistance, and salt spray resistance using the ordinary method in the standard GB / T27806-2011 for epoxy asphalt anticorrosion coatings. The results are shown in Table 1.

[0085] Table 1. Performance Test Results of Epoxy Asphalt Anticorrosion Coating for Steel Structures

[0086]

[0087]

[0088] As can be seen from the performance parameters in Table 1, this product significantly improves the drying speed of the coating, especially at low temperatures, and improves the low-temperature curing performance of the coating. The coating can be applied normally at 5℃.

[0089] This product has excellent impact resistance and bending performance. When used for corrosion protection of steel structure surfaces, the coating reduces the risk of cracking and peeling under external stress, is less likely to lose its anti-corrosion ability, and extends the service life of the coating.

[0090] This product has excellent chemical resistance and salt spray resistance, and can provide long-term protection and corrosion resistance for steel structures.

[0091] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An epoxy asphalt anticorrosion coating for steel structures, characterized in that, This anti-corrosion coating consists of component A and component B; Component A includes: asphalt, epoxy resin, diluent, oiliness agent, and optional filler; Component B is a modified polyetheramine curing agent; The modified polyetheramine curing agent is prepared by a method comprising the following steps: (1) Polyethylene glycol and p-toluenesulfonyl chloride are reacted in the presence of a first organic solvent and a catalyst; (2) In the presence of a protective gas and a second organic solvent, the reaction solution obtained in step (1) is brought into contact with and reacted with ethylenediamine to obtain polyoxyethylene polyamine; (3) The polyoxyethylene polyamine, phenol and formaldehyde aqueous solution are reacted to obtain the modified polyetheramine curing agent; The polyethylene glycol has a weight-average molecular weight of 200-250; the molar ratio of polyethylene glycol to p-toluenesulfonyl chloride is 1:2-2.5; the molar ratio of p-toluenesulfonyl chloride to ethylenediamine is 1:1-1.2; the molar ratio of polyoxyethylene polyamine to phenol is 1:1-3; and the molar ratio of polyoxyethylene polyamine to formaldehyde is 1:0.8-1.

2. Of which, based on the total weight of component A, the asphalt is 15-50 wt%, the epoxy resin is 10-50 wt%, the diluent is 5-15 wt%, the oiliness agent is 10-20 wt%, and the filler is 0-60 wt%. The mass ratio of component A to component B is 100:5~25.

2. The epoxy asphalt anticorrosion coating for steel structures according to claim 1, wherein, The first organic solvent is tetrahydrofuran; the catalyst is pyridine; The second organic solvent is toluene; The mass concentration of the formaldehyde aqueous solution is 37-38%.

3. The epoxy asphalt anticorrosion coating for steel structures according to claim 1, wherein, In step (1): the reaction temperature is 15~30℃ and the time is 36~48h; the molar ratio of the catalyst to the polyethylene glycol is 1:13~14; In step (2): the reaction temperature is 100~150℃; In step (3): the reaction temperature is 80~90℃; After the reaction is complete, vacuum dehydration and distillation are performed to obtain the modified polyetheramine curing agent.

4. The epoxy asphalt anticorrosion coating for steel structures according to claim 1, wherein, The asphalt is at least one of petroleum asphalt, coal tar pitch, and modified petroleum asphalt; The epoxy resin is at least one of bisphenol A type epoxy resin, bisphenol F type epoxy resin, polyphenol type glycidyl ether epoxy resin, aliphatic glycidyl ether epoxy resin and glycidyl ester type epoxy resin. The filler is at least one of calcium carbonate, barium sulfate, titanium dioxide, quartz powder, mica powder, talc powder, and bentonite.

5. The epoxy asphalt anticorrosive coating for steel structures according to claim 1, wherein, The diluent is an active diluent and / or a non-active diluent.

6. The epoxy asphalt anticorrosive coating for steel structures according to claim 5, wherein, The active diluent is at least one of n-butyl glycidyl ether, allyl glycidyl ether, and phenyl glycidyl ether; The inactive diluent is at least one of benzyl alcohol, benzene, toluene, and xylene.

7. The method for preparing epoxy asphalt anticorrosion coating for steel structures according to any one of claims 1-6, characterized in that, The preparation method includes: Preparation of component A: The epoxy resin, diluent and oiliness agent are stirred and mixed, then the asphalt is added and stirred and mixed, and optionally the filler is added last and stirred and mixed to obtain component A; Preparation of component B: (1) Polyethylene glycol and p-toluenesulfonyl chloride are reacted in the presence of a first organic solvent and a catalyst; (2) In the presence of a protective gas and a second organic solvent, the reaction solution obtained in step (1) is brought into contact with and reacted with ethylenediamine to obtain polyoxyethylene polyamine; (3) The polyoxyethylene polyamine, phenol and formaldehyde aqueous solution are reacted to obtain the modified polyetheramine curing agent.

8. The preparation method according to claim 7, wherein, In the preparation of component A: the asphalt is added at 60~80℃ and stirred and mixed.

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