Modified high chlorinated polyethylene fireproof anticorrosive composite coating

Abstract

The invention discloses a modified high chlorinated polyethylene fireproof and anticorrosive composite coating. A preparation method of the modified high chlorinated polyethylene fireproof and anticorrosive composite coating comprises the following steps: S1, preparing materials; s2, primarily mixing the materials; s3, grinding; s4, performing secondary material mixing; and S5, inspecting and filling. According to the invention, specific modification treatment is carried out on the high chlorinated polyethylene resin, then the modified high chlorinated polyethylene resin is introduced into the composite coating, and the modified high chlorinated polyethylene resin can greatly improve the coating performance and can greatly reduce the permeability of water vapor, oxygen and corrosive ions, so that the composite coating can show relatively excellent corrosion resistance; therefore, the service life of the coating is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and is particularly suitable for a modified highly chlorinated polyethylene fireproof and anticorrosive composite coating. Background Art

[0002] Fire-retardant and anti-corrosion coating is a functional coating that can be used in special environments. It has both fire-retardant and anti-corrosion properties, and can effectively protect the surfaces of various substrates that need protection.

[0003] Fireproof and anti-corrosion coatings can be widely used in various construction projects, especially in places that have high requirements for substrates or special needs for fire prevention and anti-corrosion, such as large commercial centers, industrial plants, stadiums, marine environments, chemical plants and other places that are prone to corrosion. The use of fireproof and anti-corrosion coatings in these places can better protect the substrate from fire and corrosion, thereby extending the service life and improving overall safety.

[0004] Highly chlorinated polyethylene resin is a very brittle polymer. There are no double bonds in its molecular structure. Chlorine atoms are randomly distributed in the structure. Therefore, it has good chemical resistance, corrosion resistance (acid, alkali, salt, etc.), resistance to atmospheric aging (not easy to powder), flame retardancy, wear resistance and other characteristics.

[0005] Applying high chlorinated polyethylene resin to coatings can further improve their comprehensive performance. However, conventional high chlorinated polyethylene resin has limited effect on improving the performance of coatings and cannot further expand its application field.

[0006] Therefore, the present invention solves the corresponding problems by providing a modified highly chlorinated polyethylene fire retardant and anticorrosive composite coating. Summary of the invention

[0007] The purpose of the present invention is to provide a modified highly chlorinated polyethylene fireproof and anticorrosive composite coating to solve the deficiencies in the prior art.

[0008] The technical solution adopted by the present invention is as follows:

[0009] A modified highly chlorinated polyethylene fireproof and anticorrosion composite coating, the preparation method of the modified highly chlorinated polyethylene fireproof and anticorrosion composite coating comprises the following steps:

[0010] S1 Preparation:

[0011] Weigh the following according to weight: 50-60 parts of composite modified high chlorinated polyethylene resin, 1-2 parts of ammonium polyphosphate, 1-3 parts of titanium dioxide, 12-15 parts of nano filler, 2-3 parts of talc, 1-1.5 parts of magnesium hydroxide, 2-3 parts of chlorinated paraffin, 1-2 parts of defoamer, and 50-60 parts of solvent;

[0012] S2 Preliminary mixing:

[0013] The solvent, the composite modified high chlorinated polyethylene resin and the defoamer are sequentially added together, and then stirred for 30 minutes to obtain a first mixed material;

[0014] S3 Grind:

[0015] Add ammonium polyphosphate, titanium dioxide, nanofiller, talcum powder and magnesium hydroxide into a mixer, stir and mix them evenly, then add them into a grinder for grinding for 2 hours to obtain a grind;

[0016] S4 secondary mixing:

[0017] The first mixed material, chlorinated paraffin and the grinding material were sequentially added into a mixer, stirred for 1 hour, and then ultrasonically dispersed for 10 minutes to obtain a composite coating;

[0018] S5 inspection and filling:

[0019] After the composite coating has been inspected and found to be qualified, it can be filled and the product is ready.

[0020] As a further technical solution: the preparation method of the composite modified high chlorinated polyethylene resin is:

[0021] First, the maleic anhydride is crushed and ground to obtain maleic anhydride powder;

[0022] Adding maleic anhydride powder to acetone, stirring and mixing evenly to obtain a maleic anhydride dispersion;

[0023] Add polypropylene resin to maleic anhydride dispersion, heat to 80°C under inert atmosphere, keep warm and stir for 2 hours, then discharge, and dry by rotary evaporation to obtain solid reaction material;

[0024] The solid reaction material was washed three times with an ethanol solution and then dried to obtain a modifier;

[0025] The obtained modifier and high chlorinated polyethylene are added into a twin-screw extruder for melt extrusion, and then added into an injection molding machine for injection molding into a sheet;

[0026] The obtained sheet is crushed to obtain a composite modified highly chlorinated polyethylene resin.

[0027] As a further technical solution: the maleic anhydride and acetone are mixed in a ratio of 2-3 g: 200 mL;

[0028] The mixing ratio of polypropylene resin and maleic anhydride dispersion is 20-25g:200mL.

[0029] As a further technical solution: the inert atmosphere is nitrogen.

[0030] As a further technical solution: the mass fraction of the ethanol solution is 80%;

[0031] The mixing mass ratio of the modifier to the highly chlorinated polyethylene is 1:10-12.

[0032] As a further technical solution: the nano filler is nano bentonite.

[0033] As a further technical solution: the defoamer is a silicone defoamer.

[0034] As a further technical solution: the solvent is xylene.

[0035] As a further technical solution: the grinding speed is 800r / min.

[0036] Beneficial effects:

[0037] The composite coating prepared by the present invention not only has excellent fire resistance but also has excellent corrosion resistance, can adapt to more complex environments, and plays a more comprehensive protective role on the substrate.

[0038] The invention performs a specific modification treatment on the high chlorinated polyethylene resin and then introduces it into the composite coating. The modified high chlorinated polyethylene resin can greatly improve the coating performance and greatly reduce the permeability of water vapor, oxygen and corrosive ions, thereby showing relatively excellent anti-corrosion performance, thereby extending the service life of the coating.

[0039] By modifying the highly chlorinated polyethylene resin, the prepared coating has the ability to inhibit the growth of toxic bacteria and exhibit excellent fire resistance due to the high "chlorine" content in the polymer.

[0040] The modified composite highly chlorinated polyethylene resin has higher compatibility with other components than the untreated highly chlorinated polyethylene resin, and the comprehensive effect of other components can improve the comprehensive performance of the coating.

[0041] The composite coating prepared by the invention dries quickly, is not restricted by season and temperature during construction, and has good recoatability.

[0042] The composite coating prepared by the invention can be widely used in various construction projects, especially in large commercial centers, industrial plants, stadiums and other places with high requirements on steel structures.

[0043] Through the coordinated effect of magnesium hydroxide and nanofillers, when the coating is heated, it will decompose to produce water and magnesium oxide. In this process, a large amount of heat is absorbed, which effectively reduces the ambient temperature, thereby slowing down the burning rate of the material and playing an excellent fire-proof role. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 The present invention is a flow chart for the preparation of a modified highly chlorinated polyethylene fire retardant and anti-corrosion composite coating. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] The following are specific embodiments

[0047] Example 1

[0048] A modified highly chlorinated polyethylene fireproof and anticorrosion composite coating, the preparation method of the modified highly chlorinated polyethylene fireproof and anticorrosion composite coating comprises the following steps:

[0049] S1 Preparation:

[0050] Weigh the following according to weight: 50 parts of composite modified high chlorinated polyethylene resin, 1 part of ammonium polyphosphate, 1 part of titanium dioxide, 12 parts of nano-bentonite, 2 parts of talc, 1 part of magnesium hydroxide, 2 parts of chlorinated paraffin, 1 part of organosilicon defoamer, and 50 parts of xylene;

[0051] S2 Preliminary mixing:

[0052] Xylene, composite modified high chlorinated polyethylene resin, and organosilicon defoamer are added together in sequence, and then stirred for 30 minutes to obtain a first mixed material;

[0053] S3 Grind:

[0054] Add ammonium polyphosphate, titanium dioxide, nano-bentonite, talcum powder and magnesium hydroxide into a mixer, stir and mix them evenly, then add them into a grinder for grinding for 2 hours to obtain a grind;

[0055] S4 secondary mixing:

[0056] The first mixed material, chlorinated paraffin and the grinding material were sequentially added into a mixer, stirred for 1 hour, and then ultrasonically dispersed for 10 minutes to obtain a composite coating;

[0057] S5 inspection and filling:

[0058] After the composite coating has been inspected and found to be qualified, it can be filled and the product is ready.

[0059] The preparation method of the composite modified high chlorinated polyethylene resin is as follows:

[0060] First, the maleic anhydride is crushed and ground to obtain maleic anhydride powder;

[0061] Adding maleic anhydride powder to acetone, stirring and mixing evenly to obtain a maleic anhydride dispersion;

[0062] Add polypropylene resin to maleic anhydride dispersion, heat to 80°C under nitrogen protection, keep warm and stir for 2 hours, then discharge, and dry by rotary evaporation to obtain solid reaction material;

[0063] The solid reaction material was washed three times with an ethanol solution and then dried to obtain a modifier;

[0064] The obtained modifier and high chlorinated polyethylene are added into a twin-screw extruder for melt extrusion, and then added into an injection molding machine for injection molding into a sheet;

[0065] The obtained sheet is crushed to obtain a composite modified highly chlorinated polyethylene resin.

[0066] The mixing ratio of maleic anhydride and acetone is 2g:200mL;

[0067] The mixing ratio of polypropylene resin and maleic anhydride dispersion is 20g:200mL.

[0068] The mass fraction of ethanol solution is 80%;

[0069] The mixing mass ratio of the modifier to the highly chlorinated polyethylene is 1:10.

[0070] The grinding speed is 800r / min.

[0071] Example 2

[0072] A modified highly chlorinated polyethylene fireproof and anticorrosion composite coating, the preparation method of the modified highly chlorinated polyethylene fireproof and anticorrosion composite coating comprises the following steps:

[0073] S1 Preparation:

[0074] Weigh the following according to weight: 52 parts of composite modified high chlorinated polyethylene resin, 1.5 parts of ammonium polyphosphate, 2 parts of titanium dioxide, 13 parts of nano-bentonite, 2.5 parts of talc, 1.2 parts of magnesium hydroxide, 2.3 parts of chlorinated paraffin, 1.5 parts of organosilicon defoamer, and 55 parts of xylene;

[0075] S2 Preliminary mixing:

[0076] Xylene, composite modified high chlorinated polyethylene resin, and organosilicon defoamer are added together in sequence, and then stirred for 30 minutes to obtain a first mixed material;

[0077] S3 Grind:

[0078] Add ammonium polyphosphate, titanium dioxide, nano-bentonite, talcum powder and magnesium hydroxide into a mixer, stir and mix them evenly, then add them into a grinder for grinding for 2 hours to obtain a grind;

[0079] S4 secondary mixing:

[0080] The first mixed material, chlorinated paraffin and the grinding material were sequentially added into a mixer, stirred for 1 hour, and then ultrasonically dispersed for 10 minutes to obtain a composite coating;

[0081] S5 inspection and filling:

[0082] After the composite coating has been inspected and found to be qualified, it can be filled and the product is ready.

[0083] The preparation method of the composite modified high chlorinated polyethylene resin is as follows:

[0084] First, the maleic anhydride is crushed and ground to obtain maleic anhydride powder;

[0085] Adding maleic anhydride powder to acetone, stirring and mixing evenly to obtain a maleic anhydride dispersion;

[0086] Add polypropylene resin to maleic anhydride dispersion, heat to 80°C under nitrogen protection, keep warm and stir for 2 hours, then discharge, and dry by rotary evaporation to obtain solid reaction material;

[0087] The solid reaction material was washed three times with an ethanol solution and then dried to obtain a modifier;

[0088] The obtained modifier and high chlorinated polyethylene are added into a twin-screw extruder for melt extrusion, and then added into an injection molding machine for injection molding into a sheet;

[0089] The obtained sheet is crushed to obtain a composite modified highly chlorinated polyethylene resin.

[0090] The mixing ratio of maleic anhydride and acetone is 2.1g:200mL;

[0091] The mixing ratio of polypropylene resin and maleic anhydride dispersion is 22g:200mL.

[0092] The mass fraction of ethanol solution is 80%;

[0093] The mixing mass ratio of the modifier to the highly chlorinated polyethylene is 1:11.

[0094] The grinding speed is 800r / min.

[0095] Example 3

[0096] A modified highly chlorinated polyethylene fireproof and anticorrosion composite coating, the preparation method of the modified highly chlorinated polyethylene fireproof and anticorrosion composite coating comprises the following steps:

[0097] S1 Preparation:

[0098] Weigh the following according to weight: 56 parts of composite modified high chlorinated polyethylene resin, 1.5 parts of ammonium polyphosphate, 2 parts of titanium dioxide, 13 parts of nano-bentonite, 2.5 parts of talc, 1.4 parts of magnesium hydroxide, 2.5 parts of chlorinated paraffin, 1.2 parts of organosilicon defoamer, and 55 parts of xylene;

[0099] S2 Preliminary mixing:

[0100] Xylene, composite modified high chlorinated polyethylene resin, and organosilicon defoamer are added together in sequence, and then stirred for 30 minutes to obtain a first mixed material;

[0101] S3 Grind:

[0102] Add ammonium polyphosphate, titanium dioxide, nano-bentonite, talcum powder and magnesium hydroxide into a mixer, stir and mix them evenly, then add them into a grinder for grinding for 2 hours to obtain a grind;

[0103] S4 secondary mixing:

[0104] The first mixed material, chlorinated paraffin and the grinding material were sequentially added into a mixer, stirred for 1 hour, and then ultrasonically dispersed for 10 minutes to obtain a composite coating;

[0105] S5 inspection and filling:

[0106] After the composite coating has been inspected and found to be qualified, it can be filled and the product is ready.

[0107] The preparation method of the composite modified high chlorinated polyethylene resin is as follows:

[0108] First, the maleic anhydride is crushed and ground to obtain maleic anhydride powder;

[0109] Adding maleic anhydride powder to acetone, stirring and mixing evenly to obtain a maleic anhydride dispersion;

[0110] Add polypropylene resin to maleic anhydride dispersion, heat to 80°C under nitrogen protection, keep warm and stir for 2 hours, then discharge, and dry by rotary evaporation to obtain solid reaction material;

[0111] The solid reaction material was washed three times with an ethanol solution and then dried to obtain a modifier;

[0112] The obtained modifier and high chlorinated polyethylene are added into a twin-screw extruder for melt extrusion, and then added into an injection molding machine for injection molding into a sheet;

[0113] The obtained sheet is crushed to obtain a composite modified highly chlorinated polyethylene resin.

[0114] The mixing ratio of maleic anhydride and acetone is 2.5g:200mL;

[0115] The mixing ratio of polypropylene resin and maleic anhydride dispersion is 23g:200mL.

[0116] The mass fraction of ethanol solution is 80%;

[0117] The mixing mass ratio of the modifier to the highly chlorinated polyethylene is 1:10.

[0118] The grinding speed is 800r / min.

[0119] Example 4

[0120] A modified highly chlorinated polyethylene fireproof and anticorrosion composite coating, the preparation method of the modified highly chlorinated polyethylene fireproof and anticorrosion composite coating comprises the following steps:

[0121] S1 Preparation:

[0122] Weigh the following according to weight: 58 parts of composite modified high chlorinated polyethylene resin, 1.5 parts of ammonium polyphosphate, 2 parts of titanium dioxide, 14 parts of nano-bentonite, 2.1 parts of talc, 1.2 parts of magnesium hydroxide, 2.8 parts of chlorinated paraffin, 1.5 parts of organosilicon defoamer, and 55 parts of xylene;

[0123] S2 Preliminary mixing:

[0124] Xylene, composite modified high chlorinated polyethylene resin, and organosilicon defoamer are added together in sequence, and then stirred for 30 minutes to obtain a first mixed material;

[0125] S3 Grind:

[0126] Add ammonium polyphosphate, titanium dioxide, nano-bentonite, talcum powder and magnesium hydroxide into a mixer, stir and mix them evenly, then add them into a grinder for grinding for 2 hours to obtain a grind;

[0127] S4 secondary mixing:

[0128] The first mixed material, chlorinated paraffin and the grinding material were sequentially added into a mixer, stirred for 1 hour, and then ultrasonically dispersed for 10 minutes to obtain a composite coating;

[0129] S5 inspection and filling:

[0130] After the composite coating has been inspected and found to be qualified, it can be filled and the product is ready.

[0131] The preparation method of the composite modified high chlorinated polyethylene resin is as follows:

[0132] First, the maleic anhydride is crushed and ground to obtain maleic anhydride powder;

[0133] Adding maleic anhydride powder to acetone, stirring and mixing evenly to obtain a maleic anhydride dispersion;

[0134] Add polypropylene resin to maleic anhydride dispersion, heat to 80°C under nitrogen protection, keep warm and stir for 2 hours, then discharge, and dry by rotary evaporation to obtain solid reaction material;

[0135] The solid reaction material was washed three times with an ethanol solution and then dried to obtain a modifier;

[0136] The obtained modifier and high chlorinated polyethylene are added into a twin-screw extruder for melt extrusion, and then added into an injection molding machine for injection molding into a sheet;

[0137] The obtained sheet is crushed to obtain a composite modified highly chlorinated polyethylene resin.

[0138] The mixing ratio of maleic anhydride and acetone is 2.5g:200mL;

[0139] The mixing ratio of polypropylene resin and maleic anhydride dispersion is 24g:200mL.

[0140] The mass fraction of ethanol solution is 80%;

[0141] The mixing mass ratio of the modifier to the highly chlorinated polyethylene is 1:11.

[0142] The grinding speed is 800r / min.

[0143] Example 5

[0144] A modified highly chlorinated polyethylene fireproof and anticorrosion composite coating, the preparation method of the modified highly chlorinated polyethylene fireproof and anticorrosion composite coating comprises the following steps:

[0145] S1 Preparation:

[0146] Weigh the following according to weight: 60 parts of composite modified high chlorinated polyethylene resin, 2 parts of ammonium polyphosphate, 3 parts of titanium dioxide, 15 parts of nano-bentonite, 3 parts of talc, 1.5 parts of magnesium hydroxide, 3 parts of chlorinated paraffin, 2 parts of organosilicon defoamer, and 60 parts of xylene;

[0147] S2 Preliminary mixing:

[0148] Xylene, composite modified high chlorinated polyethylene resin, and organosilicon defoamer are added together in sequence, and then stirred for 30 minutes to obtain a first mixed material;

[0149] S3 Grind:

[0150] Add ammonium polyphosphate, titanium dioxide, nano-bentonite, talcum powder and magnesium hydroxide into a mixer, stir and mix them evenly, then add them into a grinder for grinding for 2 hours to obtain a grind;

[0151] S4 secondary mixing:

[0152] The first mixed material, chlorinated paraffin and the grinding material were sequentially added into a mixer, stirred for 1 hour, and then ultrasonically dispersed for 10 minutes to obtain a composite coating;

[0153] S5 inspection and filling:

[0154] After the composite coating has been inspected and found to be qualified, it can be filled and the product is ready.

[0155] The preparation method of the composite modified high chlorinated polyethylene resin is as follows:

[0156] First, the maleic anhydride is crushed and ground to obtain maleic anhydride powder;

[0157] Adding maleic anhydride powder to acetone, stirring and mixing evenly to obtain a maleic anhydride dispersion;

[0158] Add polypropylene resin to maleic anhydride dispersion, heat to 80°C under nitrogen protection, keep warm and stir for 2 hours, then discharge, and dry by rotary evaporation to obtain solid reaction material;

[0159] The solid reaction material was washed three times with an ethanol solution and then dried to obtain a modifier;

[0160] The obtained modifier and high chlorinated polyethylene are added into a twin-screw extruder for melt extrusion, and then added into an injection molding machine for injection molding into a sheet;

[0161] The obtained sheet is crushed to obtain a composite modified highly chlorinated polyethylene resin.

[0162] The mixing ratio of maleic anhydride and acetone is 3g:200mL;

[0163] The mixing ratio of polypropylene resin and maleic anhydride dispersion is 25g:200mL.

[0164] The mass fraction of ethanol solution is 80%;

[0165] The mixing mass ratio of the modifier to the highly chlorinated polyethylene is 1:12.

[0166] The grinding speed is 800r / min.

[0167] Comparative Example 1:

[0168] On the basis of the technical solution of Example 1, the composite modified highly chlorinated polyethylene resin is replaced by unmodified highly chlorinated polyethylene resin, and the rest of the technical solutions remain unchanged.

[0169] Comparative Example 2:

[0170] On the basis of the technical solution of Example 1, the modifier is replaced by polypropylene resin during the preparation of the composite modified highly chlorinated polyethylene resin, and the rest of the technical solutions remain unchanged.

[0171] The high chlorinated polyethylene resin parameters used in the present invention are:

[0172] Table 1

[0173] Test items index Chlorine content% 68 <![CDATA[Density g / cm 3 > 0.45 Thermal decomposition temperature℃ 146 Viscosity after dissolution 60(Painted-4) Volatile matter% 0.4 Thermal stability time min 5

[0174] The performance tests of the following examples and comparative examples of coatings were carried out according to national standards:

[0175] Adhesion test was performed on the coating samples of the embodiment and the comparative example, as shown in Table 2:

[0176] Table 2

[0177] Adhesion / Grade Example 1 1 Example 2 1 Example 3 1 Example 4 1 Example 5 1 Comparative Example 1 3 Comparative Example 2 2

[0178] It can be seen from Table 2 that the coating prepared by the present invention has higher adhesion.

[0179] The salt spray resistance test was performed on the coating samples of the embodiment and the comparative example, and the average results are shown in Table 3:

[0180] Table 3

[0181] Salt spray resistance (5% neutral salt spray) Example 1 300h no change Example 2 300h no change Example 3 300h no change Example 4 300h no change Example 5 300h no change Comparative Example 1 200h No change Comparative Example 2 250h no change

[0182] It can be seen from Table 3 that the silica aerogel coating prepared in the present invention has a lower thermal conductivity.

[0183] Acid resistance test of each group of samples of the embodiment and the comparative example (10% sulfuric acid, 20°C, 30d):

[0184] Table 4

[0185]

[0186] It can be seen from Table 4 that the coating prepared by the present invention has excellent acid resistance.

[0187] Fire resistance:

[0188] The example and comparative example coatings were baked at 350°C flame on average to compare the expansion time of each coating:

[0189] Table 5

[0190]

[0191]

[0192] It can be seen from Table 5 that the coating prepared by the present invention has excellent fire resistance.

[0193] The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the specification, should be within the protection scope of the present invention.

Claims

1. A modified highly chlorinated polyethylene fire retardant and anticorrosive composite coating, characterized in that: The method for preparing the modified highly chlorinated polyethylene fire retardant and anticorrosive composite coating comprises the following steps: S1 Preparation: Weigh the following according to weight: 50-60 parts of composite modified high chlorinated polyethylene resin, 1-2 parts of ammonium polyphosphate, 1-3 parts of titanium dioxide, 12-15 parts of nano filler, 2-3 parts of talc, 1-1.5 parts of magnesium hydroxide, 2-3 parts of chlorinated paraffin, 1-2 parts of defoamer, and 50-60 parts of solvent; S2 Preliminary mixing: The solvent, the composite modified high chlorinated polyethylene resin and the defoamer are sequentially added together, and then stirred for 30 minutes to obtain a first mixed material; S3 Grind: Add ammonium polyphosphate, titanium dioxide, nanofiller, talcum powder and magnesium hydroxide into a mixer, stir and mix them evenly, then add them into a grinder for grinding for 2 hours to obtain a grind; S4 secondary mixing: The first mixed material, chlorinated paraffin and the grinding material were sequentially added into a mixer, stirred for 1 hour, and then ultrasonically dispersed for 10 minutes to obtain a composite coating; S5 inspection and filling: After the composite coating has been inspected and found to be qualified, it can be filled and the product is ready.

2. A modified highly chlorinated polyethylene fire retardant and anticorrosive composite coating according to claim 1, characterized in that: The preparation method of the composite modified high chlorinated polyethylene resin is as follows: First, the maleic anhydride is crushed and ground to obtain maleic anhydride powder; Adding maleic anhydride powder to acetone, stirring and mixing evenly to obtain a maleic anhydride dispersion; Add polypropylene resin to maleic anhydride dispersion, heat to 80°C under inert atmosphere, keep warm and stir for 2 hours, then discharge, and dry by rotary evaporation to obtain solid reaction material; The solid reaction material was washed three times with an ethanol solution and then dried to obtain a modifier; The obtained modifier and high chlorinated polyethylene are added into a twin-screw extruder for melt extrusion, and then added into an injection molding machine for injection molding into a sheet; The obtained sheet is crushed to obtain a composite modified highly chlorinated polyethylene resin.

3. A modified highly chlorinated polyethylene fire retardant and anticorrosive composite coating according to claim 2, characterized in that: The maleic anhydride and acetone mixture ratio is 2-3 g: 200 mL; The mixing ratio of polypropylene resin and maleic anhydride dispersion is 20-25g:200mL.

4. The fire-proof and anti-corrosion composite coating of modified highly chlorinated polyethylene according to claim 2, characterized in that: The inert atmosphere is nitrogen.

5. The fire-proof and anti-corrosion composite coating of modified highly chlorinated polyethylene according to claim 2, characterized in that: The mass fraction of the ethanol solution is 80%; The mixing mass ratio of the modifier to the highly chlorinated polyethylene is 1:10-12.

6. The fire-proof and anti-corrosion composite coating of modified highly chlorinated polyethylene according to claim 1, characterized in that: The nano filler is nano bentonite.

7. The fire-proof and anti-corrosion composite coating of modified highly chlorinated polyethylene according to claim 1, characterized in that: The defoamer is an organosilicon defoamer.

8. The fire-proof and anti-corrosion composite coating of modified highly chlorinated polyethylene according to claim 1, characterized in that: The solvent is xylene.

9. The fire-proof and anti-corrosion composite coating of modified highly chlorinated polyethylene according to claim 1, characterized in that: The grinding speed is 800 r / min.

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