High-temperature-resistant fireproof coating applied to surface of marine container and preparation method of high-temperature-resistant fireproof coating

Abstract

The invention relates to a marine container surface fireproof coating as well as a preparation method and application thereof. The fireproof coating comprises a base material, ammonium polyphosphate, pentaerythritol, melamine, a fireproof filler, deionized water and a proper amount of an auxiliary agent. By blending the materials, the obtained fireproof coating has good sprayability, environmental protection property, low-temperature flexibility and fireproof performance. The fireproof coating is suitable for the surface of a shipping container, can effectively improve the fireproof safety of the container, and guarantees the safety of the shipping process. In addition, the coating is simple in preparation method, low in cost and wide in application prospect.

Description

Technical Field

[0001] This invention belongs to the field of composite material coating technology, specifically relating to a high-temperature resistant fireproof coating for use on the surface of shipping containers and its preparation method. Background Technology

[0002] With the acceleration of globalization, shipping containers have become an indispensable logistics carrier in international trade. Statistics show that hundreds of millions of containers are transported between ports worldwide each year, involving goods worth billions of dollars. However, shipping containers may encounter emergencies such as fires during transport, which not only threaten the containers themselves but also potentially affect the safety of the cargo, the marine environment, and the lives of people at sea. Therefore, research on fire-retardant coatings for the surface of shipping container shells has significant practical implications and broad market demand.

[0003] Currently, most container coatings on the market only offer corrosion and stain resistance, lacking effective fire resistance. While some coatings incorporate flame retardants during production to enhance their fire resistance, these coatings are prone to melting and dripping at high temperatures, creating pathways for fire spread. Furthermore, the toxic fumes produced during combustion can harm human health. In addition, current container coatings perform poorly in fire resistance tests, such as the ISO flame test and ISO fire resistance test, indicating their inability to protect containers and their cargo in a fire. Moreover, fire damage to containers and their cargo is often devastating, not only resulting in cargo loss but also severely damaging the container itself and affecting its lifespan. Fires also pollute the marine environment and threaten the health of rescue personnel and surrounding populations. Therefore, developing a new type of coating with highly effective fire resistance is crucial for improving the safety of maritime containers.

[0004] To address the problems existing in the prior art, this invention provides a fire-retardant coating for use on the surface of shipping container shells. This coating uses special fire retardants and high-temperature resistant resins as its main raw materials, exhibiting excellent fire-retardant and high-temperature resistance properties. Through a special formulation and preparation process, the coating remains stable under high-temperature environments, without melting or dripping, effectively preventing the spread of fire and protecting the container and its internal cargo. Simultaneously, the coating produces less smoke during combustion, posing less harm to human health and the environment. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a fire-retardant coating for the surface of shipping containers, its preparation method, and its application. This fire-retardant coating, through the coordinated combination of its specific components, exhibits excellent adhesion, water resistance, weather resistance, and fire resistance. It can be applied to the surface of shipping containers to ensure the safety of goods inside during long-distance transportation.

[0006] The technical solution adopted in this invention is as follows:

[0007] This invention provides a high-temperature resistant fireproof coating for the surface of shipping containers;

[0008] Using the above technical solution, the nano self-cleaning coating has good anti-corrosion and stain removal properties.

[0009] It is made from the following raw materials: base material, ammonium polyphosphate, pentaerythritol, melamine, fire-retardant filler, deionized water, and appropriate additives.

[0010] The fire-retardant coating of this invention is a two-component polyurethane system, which solves the problem of cracking and peeling that easily occurs in traditional epoxy coatings in thick-layer applications. This coating not only exhibits excellent fire-retardant performance and ease of application, but also possesses outstanding temperature resistance, maintaining its fire-retardant properties unaffected even in extreme low-temperature and high-temperature environments (from -40°C to 80°C). Furthermore, the coating also possesses good environmental characteristics and low-temperature flexibility, ensuring its stability and durability under various temperature conditions.

[0011] The synergistic effect of the above components results in a fire-retardant coating with good sprayability, low-temperature flexibility and fire resistance. The raw materials used do not contain toxic or harmful halogenated flame retardants or organic solvents, thus making it environmentally friendly. When used on the surface of shipping containers, it can ensure the safety of the goods inside the containers during long-distance transportation.

[0012] Preferably, component A comprises the following components by weight: 60-80 parts base material, 20-40 parts ammonium polyphosphate, 10-20 parts pentaerythritol, 15-20 parts melamine, 20-30 parts fire-retardant filler, 10-30 parts deionized water, and appropriate amount of additives.

[0013] Furthermore, according to claim 1, the fire-retardant coating applied to marine containers is characterized in that the base material is composed of polyurethane and acrylic resin in a mass ratio of 2:1.

[0014] As a preferred technical solution of the present invention, the advantage of choosing a combination of polyurethane and acrylic resin is that it can balance the crosslinking strength and curing rate of the fire-retardant coating, so as to better meet the requirements of the spraying process. If only polyurethane is used, the crosslinking density of the fire-retardant coating will be too low, the coating will be too soft, and the fire resistance will be poor. If only acrylic resin is used, the coating of the fire-retardant coating will gel after mixing with the curing agent, making it impossible to apply.

[0015] According to claim 1, the fire-retardant coating applied to marine containers is characterized in that the fire-retardant filler is made of talc, titanium dioxide and aluminum hydroxide in a weight ratio of 1:1:2.

[0016] Furthermore, the refractory filler includes a combination of talc, titanium dioxide, and aluminum hydroxide. Selecting flake-shaped refractory fillers, talc, titanium dioxide, and aluminum hydroxide in combination further improves the strength of the carbon layer.

[0017] According to claim 1, the fire-retardant coating for marine containers is characterized in that the additives are 1-5 parts dispersant and 1-5 parts defoamer.

[0018] The method for preparing a fire-retardant coating for use on marine containers according to claims 1-4 is characterized in that the preparation method includes the following steps: Step 1: Add acrylic resin, polyurethane and deionized water to a mixer and stir at high speed for a period of time; Step 2: After thoroughly crushing and mixing the fire-retardant filler with a grinder, add it to the mixed base material in small amounts several times to obtain the pre-coating. Step 3: After the additives are mixed evenly, slowly add them to the pre-coating while maintaining high-speed stirring to obtain a fire-retardant coating for use on shipping containers.

[0019] According to claim 5, the method for preparing fire-retardant coatings for maritime containers is characterized in that, in step one, the mass ratio of acrylic resin, polyurethane and deionized water is 2:1:1, the high-speed stirring time is 1-6 h, and the stirring temperature is 50-60℃.

[0020] According to the method for preparing fire-retardant coatings for maritime containers as described in claim 5, the grinding time in step two is 6-24 hours.

[0021] According to the method for preparing fire-retardant coatings for maritime containers as described in claim 5, the additives in step three are 1-5 parts dispersant and 1-5 parts defoamer, the stirring time is 1-6 h, and the stirring temperature is 50-60℃.

[0022] A fire-retardant coating for use on marine containers, prepared by the method according to any one of claims 1-8, characterized in that the thickness of the fire-retardant coating for use on marine containers is 3-5 mm.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The purpose of this invention is to provide a fire-retardant coating for the surface of shipping containers, its preparation method, and its application. It is made from the following raw materials: base material, ammonium polyphosphate, pentaerythritol, melamine, fire-retardant filler, deionized water, and appropriate additives. Through the coordinated combination of its various components, the fire-retardant coating exhibits excellent adhesion, water resistance, weather resistance, and fire resistance, and can be applied to the surface of shipping containers to ensure the safety of goods inside the containers during long-distance transportation.

[0025] Specifically, the fire-retardant coating provided by this invention has a back temperature ≤300℃ and a fire resistance time of 30 minutes at a temperature of 1300~1400℃. After 1000 hours of double 85℃ testing and high and low temperature cycling testing, the back temperature is still ≤300℃ and the fire resistance time is 30 minutes.

[0026] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the invention and should not be considered as specific limitations thereof. Unless otherwise specified, the raw materials involved in the specific embodiments of the present invention are all conventional materials in the art and can be purchased commercially.

[0027] Example 1

[0028] In this embodiment, the pigment and filler base material is composed of polyurethane and acrylic resin in a mass ratio of 2:1.

[0029] In this embodiment, the fireproof filler is made of talc powder, titanium dioxide and aluminum hydroxide in a weight ratio of 1:1:2.

[0030] In this embodiment, the additives are 5 parts dispersant and 3 parts defoamer.

[0031] The above-mentioned method for preparing fire-retardant coatings for marine containers includes the following steps: (1) Add acrylic resin, polyurethane and deionized water into a stirrer in a mass ratio of 2:1:1 and stir at high speed for 4 h at a stirring temperature of 50℃. (2) After the fireproof filler is thoroughly crushed by a grinder for 6 hours, it is added to the mixed base material in small amounts several times to obtain a pre-coating; (3) After the additives are mixed evenly, they are slowly added to the pre-coating. Under the condition of stirring temperature of 50℃, the mixture is stirred at high speed for 2 hours to obtain the fireproof coating for use in shipping containers.

[0032] In this implementation 2

[0033] A fire-retardant coating for use in shipping containers is characterized by being made from the following raw materials in parts by weight: 70 parts base material, 30 parts ammonium polyphosphate, 15 parts pentaerythritol, 15 parts melamine, 15 parts fire-retardant filler, 20 parts deionized water, and appropriate amount of additives.

[0034] In this embodiment, the pigment and filler base material is composed of polyurethane and acrylic resin in a mass ratio of 2:1.

[0035] In this embodiment, the fireproof filler is made of talc powder, titanium dioxide and aluminum hydroxide in a weight ratio of 1:1:2.

[0036] In this embodiment, the additives are 4 parts dispersant and 4 parts defoamer.

[0037] The above-mentioned method for preparing fire-retardant coatings for marine containers includes the following steps: (1) Add acrylic resin, polyurethane and deionized water into a stirrer in a mass ratio of 2:1:1 and stir at high speed for 6 h at a stirring temperature of 60℃. (2) After the fireproof filler is thoroughly crushed by a grinder for 12 hours, it is added to the mixed base material in small amounts several times to obtain a pre-coating. (3) After the additives are mixed evenly, they are slowly added to the pre-coating. Under the condition of stirring temperature of 50℃, the mixture is stirred at high speed for 6 hours to obtain a fireproof coating for use in shipping containers. Further, the mixture contains 70 parts of silicone, 20 parts of wax powder, 5 parts of UV stabilizer, 70 parts of anti-sticking agent, 6 parts of thickener, 2 parts of defoamer, and 2 parts of leveling agent.

[0038] Example 3

[0039] A fire-retardant coating for use in shipping containers is characterized by being made from the following raw materials in parts by weight: 80 parts base material, 30 parts ammonium polyphosphate, 20 parts pentaerythritol, 20 parts melamine, 15 parts fire-retardant filler, 30 parts deionized water, and appropriate amount of additives.

[0040] In this embodiment, the pigment and filler base material is composed of polyurethane and acrylic resin in a mass ratio of 2:1.

[0041] In this embodiment, the fireproof filler is made of talc powder, titanium dioxide and aluminum hydroxide in a weight ratio of 1:1:2.

[0042] In this embodiment, the additives are 5 parts dispersant and 3 parts defoamer.

[0043] The above-mentioned method for preparing fire-retardant coatings for marine containers includes the following steps: (1) Add acrylic resin, polyurethane and deionized water into a stirrer in a mass ratio of 2:1:1 and stir at high speed for 6 h at a stirring temperature of 60℃. (2) After the fireproof filler is thoroughly crushed by a grinder for 8 hours, it is added to the mixed base material in small amounts several times to obtain a pre-coating; (3) After the additives are mixed evenly, they are slowly added to the pre-coating. Under the condition of stirring temperature of 60℃, the mixture is stirred at high speed for 6 hours to obtain the fireproof coating for use in shipping containers.

[0044] Example 4

[0045] A fire-retardant coating for use in shipping containers is characterized by being made from the following raw materials in parts by weight: 60 parts base material, 30 parts ammonium polyphosphate, 10 parts pentaerythritol, 10 parts melamine, 15 parts fire-retardant filler, 20 parts deionized water, and appropriate amount of additives.

[0046] In this embodiment, the fireproof filler is made of talc powder, titanium dioxide and aluminum hydroxide in a weight ratio of 1:1:2.

[0047] In this embodiment, the additives are 3 parts dispersant and 3 parts defoamer.

[0048] The above-mentioned method for preparing fire-retardant coatings for marine containers includes the following steps: (1) Add acrylic resin, polyurethane and deionized water into a stirrer in a mass ratio of 2:1:1 and stir at high speed for 6 h at a stirring temperature of 50℃. (2) After the fireproof filler is thoroughly crushed by a grinder for 8 hours, it is added to the mixed base material in small amounts several times to obtain a pre-coating; (3) After the additives are mixed evenly, they are slowly added to the pre-coating. Under the condition of stirring temperature of 50℃, the mixture is stirred at high speed for 6 hours to obtain the fireproof coating for use in shipping containers.

[0049] Table 1 Performance Comparison of Examples Test Project Technical Requirements Example 1 Example 2 Example 3 Example 4 Drying time (surface dry) / h ≤12 5 8 10 12 Bond strength / MPa ≥0.15 conform to conform to conform to conform to pH value ≥7 conform to conform to conform to Does not meet Fire resistance ≥0.5 h / 2 mm conform to conform to conform to conform to Water resistance ≥24 conform to Does not meet conform to conform to Corrosion resistance (neutral salt spray, 72 h) pH=735℃, 72 h Slight corrosion No significant changes No significant changes No significant changes

[0050] According to the data in Table 1: The fire-retardant coatings provided in Examples 1-4 exhibit good fire resistance, high and low temperature resistance, and damp heat resistance after forming a coating, and also have good corrosion resistance, with no burn-through phenomenon.

[0051] The applicant declares that this invention illustrates a fire-retardant coating for the surface of shipping containers, its preparation method, and its application through the above embodiments. However, this invention is not limited to the above embodiments, meaning that this invention does not necessarily rely on the above embodiments for implementation. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of raw materials, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection and disclosure scope of this invention.

Claims

1. A fire-retardant coating for use in maritime shipping containers, characterized in that, It is made from the following raw materials in parts by weight: 60-80 parts base material, 20-40 parts ammonium polyphosphate, 10-20 parts pentaerythritol, 15-20 parts melamine, 20-30 parts fire retardant filler, 10-30 parts deionized water, and appropriate amount of additives.

2. The fire-retardant coating for marine containers as claimed in claim 1, characterized in that, The base material is composed of polyurethane and acrylic resin in a mass ratio of 2:

1.

3. The fire-retardant coating for use on marine containers according to claim 1, characterized in that, The fire-retardant filler is made of talc, titanium dioxide and aluminum hydroxide in a weight ratio of 1:1:

2.

4. The fire-retardant coating for use on marine containers according to claim 1, characterized in that, The additives consist of 1-5 parts dispersant and 1-5 parts defoamer.

5. The method for preparing fire-retardant coatings for marine containers according to claims 1-4, characterized in that, The preparation method includes the following steps: Step 1: Add acrylic resin, polyurethane and deionized water to a mixer and stir at high speed for a period of time; Step 2: After thoroughly crushing and mixing the fire-retardant filler with a grinder, add it to the mixed base material in small amounts several times to obtain the pre-coating. Step 3: After the additives are mixed evenly, slowly add them to the pre-coating while maintaining high-speed stirring to obtain a fire-retardant coating for use on shipping containers.

6. The method for preparing fire-retardant coatings for maritime containers according to claim 5, characterized in that, In step one, the mass ratio of acrylic resin, polyurethane and deionized water is 2:1:1, the high-speed stirring time is 1-6 h, and the stirring temperature is 50-60℃.

7. The method for preparing fire-retardant coatings for maritime containers according to claim 5, characterized in that, In step two, the grinding time is 6-24 hours.

8. The method for preparing fire-retardant coatings for maritime containers according to claim 5, characterized in that, In step three, the additives are 1-5 parts dispersant and 1-5 parts defoamer, the stirring time is 1-6 hours, and the stirring temperature is 50-60℃.

9. A fire-retardant coating for use on marine containers prepared by the method according to any one of claims 1-8, characterized in that, The thickness of the fire-retardant coating applied to shipping containers is 3-5 mm.