Flame-retardant organosilane coating and preparation process thereof

Abstract

The invention discloses a flame-retardant organosilane coating and a preparation process thereof, and relates to the technical field of organosilane coatings, in particular to a flame-retardant organosilane coating. The coating is characterized by being prepared from the following raw materials in parts by weight: 100 parts of polymethylvinylsiloxane, 5-20 parts of polymethylsiloxane, 5-20 parts of organic silicon resin, 5-30 parts of modified white carbon black, 0.5-20 parts of a high-temperature-resistant additive, 10-70 parts of a modified flame retardant, 5-50 parts of modified inorganic fiber powder, 5-10 parts of hydroxyl silicone oil and 3-5 parts of vinyl silicone oil, 2-5 parts of a silane coupling agent and 0.1-5 parts of a catalyst; the coating further comprises one or more of 2-5 parts of a dispersing agent, 3-15 parts of a hardening agent and 0.5-1 part of an inhibitor. The dispersing agent is one or more of an organic silicon dispersing agent, a polymer dispersing agent and a cationic dispersing agent; the flame retardant effect of the coating is improved, and the coating has the characteristics of good flexibility, wear resistance and impact resistance.

Description

Technical Field

[0001] The invention relates to the technical field of organosilane coatings, in particular to a flame retardant organosilane coating and a preparation process thereof. Background Art

[0002] Flame retardant organosilane coating is a high-performance coating that combines the excellent properties of organosilane with flame retardant properties. It is widely used in fields that require high flame retardancy and good weather resistance, such as construction, electronics, transportation, aerospace, etc. In the construction field, it can be used for fire retardant coatings, steel structure fire protection, etc. In the electronics field, it can be used for the packaging and protection of printed circuit boards and electronic components; in the transportation field, it can be used for fire protection of the outer shell and internal parts of vehicles such as cars, trains, and airplanes.

[0003] According to the public number: CN104974527B, a preparation method and application of a silicone resin modified polymer foam composite material is disclosed. This technology discloses "a preparation method and application of a silicone resin modified polymer foam composite material, the silicone resin modified polymer foam composite material has the following components, and the weight parts of each component are: polymer foam material 10-60, silicone resin 30-80, catalyst 0.2-2.0, inorganic filler 0-8" and other technical solutions, which have "using silicone resin to modify flammable polymer foam materials to achieve halogen-free flame retardancy of such materials; at the same time, by adding a small amount of inorganic functional fillers, the flame retardant and mechanical properties of the foam composite material can be further improved, and other functions such as hydrophobicity, antistatic and other characteristics can be given" and other technical effects;

[0004] The above scheme covers the surface of the polymer foam material with silicone resin by simple physical deposition or spraying method, and uses the good high temperature resistance, flame retardancy, water resistance and weather resistance of silicone resin to give the polymer foam composite material excellent flame retardancy and hydrophobicity; however, the use of silicone resin alone cannot guarantee the ideal flame retardant effect in environments requiring high flame retardant properties, such as construction, transportation, electronics and other fields. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a flame retardant organosilane coating and a preparation process thereof, which has the advantages of improving the flame retardant effect of the coating and having good flexibility, wear resistance and impact resistance.

[0006] To achieve the above objectives, the present invention is implemented through the following technical scheme: a flame retardant organosilane coating, characterized in that the coating comprises the following preparation raw materials in parts by weight: 100 parts of polymethylvinylsiloxane, 5-20 parts of polymethylsiloxane, 5-20 parts of silicone resin, 5-30 parts of modified white carbon black, 0.5-20 parts of high temperature resistant additives, 10-70 parts of modified flame retardants, 5-50 parts of modified inorganic fiber powders, 5-10 parts of hydroxy silicone oil, 3-5 parts of vinyl silicone oil, 2-5 parts of silane coupling agents and 0.1-5 parts of catalysts.

[0007] Preferably, the coating further comprises one or more of 2-5 parts of a dispersant, 3-15 parts of a hardener and 0.5-1 part of an inhibitor.

[0008] Preferably, the dispersant is one or more of an organosilicon dispersant, a polymer dispersant and a cationic dispersant, the hardener is one or more of alumina powder, silica powder, quartz powder or ceramic powder, and the inhibitor is one or more of an acetylene alcohol compound, vinyl siloxane and peroxide.

[0009] Preferably, the modified flame retardant is selected from one or more of aluminum hydroxide and magnesium hydroxide in inorganic flame retardants, and phosphorus, nitrogen and silicon elements in organic flame retardants.

[0010] Preferably, the catalyst is selected from one or more of hydrochloric acid, sodium hydroxide, a platinum catalyst and a disproportionation silane catalyst.

[0011] The present invention also discloses a preparation process of a flame retardant organic silane coating, which specifically comprises the following steps:

[0012] S1. Add the base material and part of the additives into a mixing kettle according to the formula ratio;

[0013] S2. Add modified flame retardant on the basis of premixing;

[0014] S3. After the flame retardant is fully dispersed, add the remaining additives;

[0015] S4. After the reaction is completed, unreacted raw materials, by-products and impurities are removed by filtration.

[0016] Preferably, in S1, polymethylvinylsiloxane, polymethylsiloxane, silicone resin, modified silica and silane coupling agent are added into a mixing kettle and preliminarily stirred and mixed.

[0017] Preferably, during the filtration in S4, the clarity and filtration speed of the filtrate are observed, and the temperature of the coating during the filtration process is ensured.

[0018] The present invention provides a flame retardant organosilane coating and a preparation process thereof. Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. By adding a large proportion of modified flame retardants, the flame retardant level of the substrate is significantly improved, effectively preventing the spread of fire and providing higher safety protection for the use scenario; high temperature resistant additives and components such as silicone resins enable the coating to maintain stable performance in high temperature environments; hydroxyl silicone oil and vinyl silicone oil enhance the wettability and adhesion of the coating to the substrate, while improving the flexibility of the coating, so that the coating can adapt to different substrates and complex shapes of surface coating; modified white carbon black and modified inorganic fiber powder are used as fillers to improve the hardness of the coating, and also enhance its wear resistance and impact resistance; silane coupling agents and catalysts improve the leveling and construction performance of the coating, making the coating easier to apply and cure, and improving construction efficiency.

[0020] 2. In the preparation of flame-retardant organosilane coatings, organosilicon dispersants can help to evenly disperse flame retardants and other solid particles, and improve the stability and performance of the coatings; polymer dispersants can significantly improve the dispersibility and stability of coatings, and prevent the precipitation and agglomeration of pigment and flame retardant particles; in situations where high hardness and wear resistance are required, alumina powder, silica powder, quartz powder or ceramic powder can effectively improve the hardness and durability of the coating; acetylene alcohol compounds are used to synthesize silane coupling agents or cross-linking agents with specific functions, thereby improving the performance of the coating, and vinyl siloxane can directly participate in the synthesis reaction of the coating as part of the resin matrix.

[0021] 3. Aluminum hydroxide can be used as an important inorganic flame retardant component to improve the flame retardant properties of coatings, and magnesium hydroxide can be used in combination with it to achieve better flame retardant effects; the flame retardant properties of coatings can be improved by adding phosphorus-containing flame retardants, and nitrogen-phosphorus-containing flame retardants and silicon-phosphorus-containing flame retardants can be used in combination with it to achieve better flame retardant effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a flow chart of the coating preparation process of the present invention. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0024] See also Figure 1The present invention provides a flame retardant organosilane coating and a preparation process technical scheme thereof: a flame retardant organosilane coating, characterized in that the coating comprises the following preparation raw materials in parts by weight: 100 parts of polymethylvinylsiloxane, 5-20 parts of polymethylsiloxane, 5-20 parts of silicone resin, 5-30 parts of modified white carbon black, 0.5-20 parts of high temperature resistant additive, 10-70 parts of modified flame retardant, 5-50 parts of modified inorganic fiber powder, 5-10 parts of hydroxy silicone oil, 3-5 parts of vinyl silicone oil, 2-5 parts of silane coupling agent and 0.1-5 parts of catalyst.

[0025] In this embodiment, by adding a large proportion of modified flame retardant, the flame retardant level of the substrate is significantly improved, the spread of fire is effectively prevented, and a higher safety guarantee is provided for the use scenario; high temperature resistant additives and components such as silicone resin enable the coating to maintain stable performance in a high temperature environment; hydroxyl silicone oil and vinyl silicone oil enhance the wettability and adhesion of the coating to the substrate, while improving the flexibility of the coating, so that the coating can adapt to surface coating of different substrates and complex shapes; modified white carbon black and modified inorganic fiber powder are used as fillers to improve the hardness of the coating, and also enhance its wear resistance and impact resistance; silane coupling agents and catalysts improve the leveling and construction performance of the coating, making the coating easier to apply and cure, thereby improving construction efficiency.

[0026] Specifically, the coating further comprises one or more of 2-5 parts of a dispersant, 3-15 parts of a hardener and 0.5-1 part of an inhibitor.

[0027] In this embodiment, in the preparation of flame-retardant organosilane coatings, organosilicon dispersants can help to evenly disperse flame retardants and other solid particles, thereby improving the stability and performance of the coating; polymer dispersants can significantly improve the dispersibility and stability of the coating, and prevent the precipitation and agglomeration of pigment and flame retardant particles.

[0028] Specifically, the dispersant is one or more of an organosilicon dispersant, a polymer dispersant and a cationic dispersant, the hardener is one or more of alumina powder, silica powder, quartz powder or ceramic powder, and the inhibitor is one or more of an acetylene alcohol compound, vinyl siloxane and peroxide.

[0029] In this embodiment, where high hardness and wear resistance are required, alumina powder, silica powder, quartz powder or ceramic powder can effectively improve the hardness and durability of the coating; acetylene alcohol compounds are used to synthesize silane coupling agents or cross-linking agents with specific functions, thereby improving the performance of the coating, and vinyl siloxane can directly participate in the synthesis reaction of the coating as part of the resin matrix.

[0030] Specifically, the modified flame retardant is selected from one or more of aluminum hydroxide and magnesium hydroxide in inorganic flame retardants, and phosphorus, nitrogen and silicon elements in organic flame retardants.

[0031] In this embodiment, aluminum hydroxide can be used as an important inorganic flame retardant component to improve the flame retardant properties of the coating, and magnesium hydroxide can be used in combination with it to achieve better flame retardant effects; the flame retardant properties of the coating are improved by adding phosphorus-containing flame retardants, and nitrogen-phosphorus-containing flame retardants and silicon-phosphorus-containing flame retardants can be used in combination with it to achieve better flame retardant effects.

[0032] Specifically, the catalyst is selected from one or more of hydrochloric acid, sodium hydroxide, platinum catalyst and disproportionation silane catalyst.

[0033] In this embodiment, hydrochloric acid can be used as a catalyst for the hydrolysis reaction to promote the hydrolysis and condensation of silane to form the desired siloxane structure; the platinum catalyst is a highly efficient organosilicon chemical catalyst that can promote the reaction under mild conditions, and the platinum catalyst can be used for the hydrosilylation reaction to cross-link hydrogen-containing silanes with unsaturated organosilicon compounds into a polymer network structure; although the silane catalyst is not directly prepared by disproportionation, the desired silane raw material can be prepared by the catalyst, and then used in the synthesis of the coating.

[0034] The present invention also discloses a preparation process of a flame retardant organic silane coating, which specifically comprises the following steps:

[0035] S1. Add the base material and part of the additives into a mixing kettle according to the formula ratio;

[0036] S2. Add modified flame retardant on the basis of premixing;

[0037] S3. After the flame retardant is fully dispersed, add the remaining additives;

[0038] S4. After the reaction is completed, unreacted raw materials, by-products and impurities are removed by filtration.

[0039] In this embodiment, hydroxy silicone oil can enhance the wettability and adhesion of the coating, while improving the leveling property, making the coating easier to apply and having a smoother surface; vinyl silicone oil enhances the hardness and durability of the coating by increasing the crosslinking density and heat resistance of the coating, making the coating more resistant to wear and high temperature.

[0040] Specifically, in S1, polymethylvinylsiloxane, polymethylsiloxane, silicone resin, modified silica and silane coupling agent are added into a mixing kettle and preliminarily stirred and mixed.

[0041] In this embodiment, the silane coupling agent mainly plays a bridging role in the organosilicon coating, connecting organic and inorganic materials and improving the adhesion and durability of the coating.

[0042] Specifically, during the filtration in S4, the clarity and filtration speed of the filtrate are observed, and the temperature of the coating during the filtration process is ensured.

[0043] In this embodiment, since the presence of impurities may affect the performance consistency of the coating, the filtration step ensures the stability and consistency of the composition and performance of each batch of coating. Through filtration, insoluble solid particles, suspended matter and other impurities in the coating can be effectively removed, making the coating purer.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flame retardant organosilane coating, characterized in that: The coating comprises the following raw materials in parts by weight: 100 parts of polymethylvinylsiloxane, 5-20 parts of polymethylsiloxane, 5-20 parts of silicone resin, 5-30 parts of modified white carbon black, 0.5-20 parts of high temperature resistant additive, 10-70 parts of modified flame retardant, 5-50 parts of modified inorganic fiber powder, 5-10 parts of hydroxy silicone oil, 3-5 parts of vinyl silicone oil, 2-5 parts of silane coupling agent and 0.1-5 parts of catalyst.

2. The flame retardant organosilane coating according to claim 1, characterized in that: The coating also includes one or more of 2-5 parts of a dispersant, 3-15 parts of a hardener and 0.5-1 part of an inhibitor.

3. A flame retardant organosilane coating according to claim 2, characterized in that: The dispersant is one or more of an organosilicon dispersant, a polymer dispersant and a cationic dispersant, the hardener is one or more of alumina powder, silicon oxide powder, quartz powder or ceramic powder, and the inhibitor is one or more of an acetylene alcohol compound, vinyl siloxane and peroxide.

4. The flame retardant organosilane coating according to claim 1, characterized in that: The modified flame retardant is selected from one or more of aluminum hydroxide and magnesium hydroxide in inorganic flame retardants and phosphorus, nitrogen and silicon elements in organic flame retardants.

5. The flame retardant organosilane coating according to claim 1, characterized in that: The catalyst is selected from one or more of hydrochloric acid, sodium hydroxide, platinum catalyst and disproportionation catalyst for preparing silane.

6. A preparation process of a flame retardant organosilane coating according to any one of claims 1 to 5, characterized in that: The specific steps include: S1. Add the base material and part of the additives into a mixing kettle according to the formula ratio; S2. Add modified flame retardant on the basis of premixing; S3. After the flame retardant is fully dispersed, add the remaining additives; S4. After the reaction is completed, unreacted raw materials, by-products and impurities are removed by filtration.

7. The process for preparing a flame retardant organosilane coating according to claim 5, characterized in that: In the S1, polymethylvinylsiloxane, polymethylsiloxane, silicone resin, modified white carbon black and silane coupling agent are added into a mixing kettle and preliminarily stirred and mixed.

8. The process for preparing a flame retardant organosilane coating according to claim 5, characterized in that: During the filtration in S4, the clarity and filtration speed of the filtrate are observed, and the temperature of the coating is ensured during the filtration process.

Images