Colored flame-retardant silicone resin and method for preparing the same, colored flame-retardant silicone glass fiber sleeve and method for preparing the same

Abstract

The application discloses a kind of color flame-retardant silicone and preparation method thereof, color flame-retardant silicone glass fiber sleeve and preparation method thereof.The ingredients of color flame-retardant silicone include liquid silicone 140-220 parts by weight, solid silicone 10-40 parts by weight, and organic temperature-resistant color paste 2-10 parts by weight, wherein the solid silicone is phenyl solid silicone, and the phenyl content in the phenyl solid silicone is 10-30 mol%.The color flame-retardant silicone provided by the application realizes the compatibility of organic pigment color system and high flame-retardant performance, improves long-term high-temperature performance, and has excellent flame-retardant property and aging resistance.

Description

Technical Field

[0001] This invention relates to the field of polymer composite materials technology, specifically to a colored flame-retardant silicone resin and its preparation method, and a colored flame-retardant silicone resin glass fiber sleeve and its preparation method. Background Technology

[0002] Fiberglass sleeving has been widely used in various fields due to its excellent performance. Utilizing the superior properties of glass fiber, through processes such as weaving and high-temperature setting, it forms a sleeving material with high strength, high heat resistance, corrosion resistance, and good insulation, applicable in fields such as power, electronics, communications, and aerospace. However, current fiberglass sleeving suffers from prominent problems such as limited flame retardant properties, difficulty in coloring, and insufficient aging resistance, limiting its application in safety protection, product aesthetics, and product lifespan. Organic pigments offer diverse colors, but they are difficult to disperse uniformly in silicone resin, and excessive addition leads to poor mechanical properties in the prepared fiberglass sleeving. Therefore, to achieve compatibility between organic pigment color systems and high flame retardant properties, and to significantly improve the long-term high-temperature resistance of products, it is essential to develop a colored flame-retardant silicone resin fiberglass sleeving with excellent flame retardancy and aging resistance. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the present invention proposes a colored flame-retardant silicone resin glass fiber sleeve with excellent flame retardancy and aging resistance.

[0004] To achieve the above objectives, the present invention proposes a colored flame-retardant silicone resin, comprising 140-220 parts of liquid silicone resin, 10-40 parts of solid silicone resin, and 2-10 parts of organic heat-resistant color paste, wherein the solid silicone resin is a phenyl solid silicone resin, and the phenyl content in the phenyl solid silicone resin is 10-30 mol.

[0005] Optionally, the liquid silicone resin comprises 120-160 parts of vinyl-terminated polysiloxane and 20-60 parts of methyl-terminated polysiloxane.

[0006] Optionally, the organic heat-resistant color paste includes silicone oil and organic pigments, wherein the organic pigments are azo pigments, lake pigments, heterocyclic pigments, fused-ring ketone pigments, or phthalocyanine pigments, or two or more of the following: azo pigments, lake pigments, heterocyclic pigments, fused-ring ketone pigments, and phthalocyanine pigments.

[0007] Optionally, the organic pigment content is 25-45%, the particle size is ≤3μm, and the temperature resistance is ≥250℃.

[0008] Optionally, the azo pigment is an acetylacetylamine-insoluble monoazo pigment, a biphenylamine and pyrazolone-insoluble diazo pigment, a β-naphthol pigment, a naphthol AS pigment, an azo condensation pigment, or a benzimidazole ketone pigment, or two or more of the following: acetylacetylamine-insoluble monoazo pigment, biphenylamine and pyrazolone-insoluble diazo pigment, β-naphthol pigment, naphthol AS pigment, azo condensation pigment, or benzimidazole ketone pigment; the lake pigment is an acetylacetylamine and pyrazolone azo lake pigment, a 2-naphthol and 2-hydroxy-3-naphthoic acid series lake pigment, or a naphthol AS lake pigment, or an acetylacetylamine and pyrazolone azo lake pigment, a 2-naphthol and 2-hydroxy-3-naphthoic acid series lake pigment, or a naphthol A... Two or more of the following are type S lake pigments: The heterocyclic pigments are dioxazine pigments, 1,4-diketone-pyrrolopyrrole (DPP) pigments, quinacridone pigments, isoindolineone and isoindoline pigments, or quinophthalone pigments; or two or more of the following are dioxazine pigments, 1,4-diketone-pyrrolopyrrole (DPP) pigments, quinacridone pigments, isoindolineone and isoindoline pigments, or quinophthalone pigments; the fused-ring ketone pigments are perylene pigments, anthraquinone pigments, pyrene pigments, or thioindigo pigments; the phthalocyanine pigments are copper phthalocyanine pigments, halogenated copper phthalocyanine pigments, metal-free phthalocyanine pigments, or phthalocyanine lake pigments; or two or more of the following are copper phthalocyanine pigments, halogenated copper phthalocyanine pigments, metal-free phthalocyanine pigments, or phthalocyanine lake pigments.

[0009] Optionally, the colored flame-retardant silicone resin further includes 10-30 parts of fumed silica, 0.1-0.5 parts of platinum catalyst, 5-15 parts of crosslinking agent, and 0.05-0.3 parts of inhibitor, wherein the fumed silica is hydrophobically treated with hexamethyldisilazane.

[0010] Optionally, the platinum catalyst is a platinum-vinylsiloxane complex, a platinum-alkynyl group complex, or an alcohol-modified chloroplatinic acid, or two or more of the following: platinum-vinylsiloxane complex, platinum-alkynyl group complex, and alcohol-modified chloroplatinic acid, with a platinum content (calculated as Pt) of 3000-5000 ppm.

[0011] Optionally, the crosslinking agent is at least one of methyl hydrogen polysiloxane, ethyl hydrogen polysiloxane, hydroxyl hydrogen polysiloxane, and epoxy hydrogen polysiloxane, with a viscosity of 50-500 mPa·s and a Si-H content of 0.5-1.2 mmol / g; the inhibitor is at least one of ethynylcyclohexanol, diallyl maleate, and tetravinyltetramethyltetrasiloxane.

[0012] To achieve the above objective, a method for preparing the colored flame-retardant silicone resin as described above includes the following steps: Preparation of component A resin: Mix 60-80 parts of vinyl-terminated polysiloxane and 10-30 parts of methyl-terminated polysiloxane, stir until uniform, add 5-20 parts of solid silicone resin, stir at 160℃-180℃ for 15-20 min, stir until uniform, add 5-15 parts of fumed silica, then stir under vacuum for 20-30 min, when the temperature drops below 40℃, add 0.1-0.5 parts of platinum catalyst and stir until uniform to obtain component A resin; Preparation of component B resin: Mix 60-80 parts of vinyl-terminated polysiloxane and 10-30 parts of methyl-terminated polysiloxane, stir until uniform, add 5-20 parts of solid silicone resin, stir at 160℃-180℃ for 15-20 min, stir until uniform, add 5-15 parts of fumed silica, then stir under vacuum for 20-30 min. When the temperature drops below 40℃, add 5-15 parts of crosslinking agent and 0.05-0.3 parts of inhibitor, stir until uniform to obtain component B resin; The colored flame-retardant silicone resin is obtained by mixing component A resin, component B resin and organic heat-resistant color paste in a ratio of 100:100:2-10.

[0013] The present invention also proposes a colored flame-retardant silicone resin glass fiber sleeve, which is prepared from any of the colored flame-retardant silicone resins described above.

[0014] To achieve the above objectives, the present invention also proposes a method for preparing a colored flame-retardant silicone resin glass fiber sleeve, comprising the following steps: coating the prepared colored flame-retardant silicone resin as described above onto the surface of a glass fiber braided sleeve, setting the coated glass fiber braided sleeve at high temperature, curing it at a constant temperature, then cooling it to room temperature, and then pulling and winding it to obtain the colored flame-retardant silicone resin glass fiber sleeve.

[0015] The beneficial effects of this invention are as follows: In this invention, the colored flame-retardant silicone resin includes liquid silicone resin, solid silicone resin, and organic heat-resistant color paste. The solid silicone resin has a unique Si-O-Si main chain structure, giving it excellent resistance to ultraviolet radiation and weathering, and it is not prone to powdering or cracking, maintaining its gloss and color for a long time. Introducing the solid silicone resin as a functional modifying component into the liquid silicone resin matrix allows it to crosslink with the liquid silicone resin at high temperatures, forming a topologically entangled three-dimensional interpenetrating network structure, increasing the crosslinking density of the solid silicone resin and liquid silicone resin composite system. The organic heat-resistant color paste uses organic pigments as the main coloring component, where the pigments have conjugated aromatic structures. The solid silicone resin is a phenyl solid silicone resin. The phenyl group (-C6H5) in the solid silicone resin is a typical aromatic ring, which specifically adsorbs onto the aromatic ring of the organic pigment through π-π stacking and hydrogen bonding, thereby anchoring the organic pigment in the solid silicone resin. The polarity is adjustable, significantly improving the compatibility of the organic pigment. Furthermore, the solid silicone resin and liquid silicone resin belong to the same family... Organosilicon systems can combine with liquid silicone resins, further embedding solid silicone resins into polymer chains. This allows the solid silicone resin to act as a bridging medium, forming a composite unit of pigment-solid resin-liquid resin. This unit simultaneously achieves high dispersibility and high compatibility of the pigment within the system, enabling the organic pigment to bond tightly with the matrix, preventing pigment precipitation and aggregation. During curing, it is less prone to migration, sedimentation, or floating color, resulting in a uniform color in the final product. Furthermore, the solid silicone resin itself possesses excellent high and low temperature resistance, superior electrical insulation, and excellent flame retardancy, producing very little smoke during combustion. It is also resistant to dilute acids, ozone, and chemical corrosion. A phenyl content of 10-30 mol% ensures a suitable phenyl content in the solid silicone resin, preventing excessively low phenyl content from leading to poor compatibility between the organic pigment and the matrix. Conversely, excessively high phenyl content results in large steric hindrance, causing the molecular chain segments to change from flexible to rigid, leading to excessive brittleness in the colored flame-retardant silicone resin and subsequent cracking. Therefore, by compounding solid silicone resin and liquid silicone resin, a "one agent, multiple effects" functional integrated system was constructed. Solid silicone resin with 10-30 mol% phenyl content participates in the curing reaction of liquid silicone resin as a functional filler, while also taking into account multiple functions such as flame retardant synergy and heat resistance enhancement. This can significantly improve the comprehensive performance of the material, break through the technical barrier of mutual exclusion between "color, flame retardancy and heat resistance", and for the first time achieve the simultaneous compliance of colored glass fiber sleeve with VW-1 flame retardant standard and temperature resistance requirement above 200℃. This enables the prepared colored flame retardant silicone resin to achieve flame retardant and heat resistance performance and has a variety of durable colors, while being safe and environmentally friendly. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. It should be understood that the following embodiments are only used to explain the present invention and are not intended to limit the present invention.

[0017] Unless otherwise specified, all technical and scientific terms used herein have their usual meaning within the field to which the subject matter is claimed.

[0018] To facilitate understanding of this embodiment, the symbols, instruments, and terms are explained below: Naphthol AS-type pigments: Naphthol AS-type pigments are azo pigments prepared by coupling 2-hydroxy-3-naphthamide compounds as coupling components with substituted aromatic amine diazonium salts. Naphthol AS-ITR, as a type of Naphthol AS-type pigment, has the chemical name N-(5-chloro-2,4-dimethoxyphenyl)-3-hydroxy-2-naphthamide. It is stable in air, generally appearing as a light gray powder, readily soluble in acetone, and soluble in solutions of pyridine, ethanol, and benzene. Notably, Naphthol AS-ITR forms a yellow solution with green fluorescence in sulfuric acid; it also forms a yellow solution in sodium hydroxide and is stable in air.

[0019] Fiberglass sleeving has been widely used in various fields due to its excellent performance. Utilizing the superior properties of glass fiber, through processes such as weaving and high-temperature setting, it forms a sleeving material with high strength, high heat resistance, corrosion resistance, and good insulation, applicable in fields such as power, electronics, communications, and aerospace. However, current fiberglass sleeving suffers from prominent problems such as limited flame retardant properties, difficulty in coloring, and insufficient aging resistance, limiting its application in safety protection, product aesthetics, and product lifespan. Organic pigments offer diverse colors, but they are difficult to disperse uniformly in silicone resin, and excessive addition leads to poor mechanical properties in the prepared fiberglass sleeving. Therefore, to achieve compatibility between organic pigment color systems and high flame retardant properties, and to significantly improve the long-term high-temperature resistance of products, it is essential to develop a colored flame-retardant silicone resin fiberglass sleeving with excellent flame retardancy and aging resistance.

[0020] To solve the above problems, the present invention proposes a colored flame-retardant silicone resin, characterized in that it comprises 140-220 parts of liquid silicone resin, 10-40 parts of solid silicone resin, and 2-10 parts of organic heat-resistant color paste, wherein the solid silicone resin is phenyl solid silicone resin, and the phenyl content in the phenyl solid silicone resin is 10-30 mol.

[0021] In this invention, the colored flame-retardant silicone resin comprises liquid silicone resin, solid silicone resin, and organic heat-resistant color paste. The solid silicone resin has a unique Si-O-Si main chain structure, giving it excellent UV resistance and weather aging resistance, and it is not prone to powdering or cracking, maintaining its gloss and color for a long time. The solid silicone resin is introduced into the liquid silicone resin matrix as a functional modifier, causing it to crosslink with the liquid silicone resin at high temperatures, forming a topologically entangled three-dimensional interpenetrating network structure, increasing the crosslinking density of the solid and liquid silicone resin composite system. The organic heat-resistant color paste uses organic pigments as the main coloring component, where the pigments have conjugated aromatic structures. The solid silicone resin is a phenyl solid silicone resin. The phenyl group (-C6H5) in the solid silicone resin is a typical aromatic ring, which specifically adsorbs onto the aromatic ring of the organic pigment through π-π stacking and hydrogen bonding, allowing the organic pigment to be anchored in the solid silicone resin with adjustable polarity, significantly improving the compatibility of the organic pigment. Furthermore, both the solid and liquid silicone resins belong to the organosilicon system. It can combine with liquid silicone resin to further embed solid silicone resin into polymer chain segments, making solid silicone resin a bridging medium to form a composite unit of pigment-solid resin-liquid resin. This unit simultaneously achieves high dispersibility and high compatibility of pigment in the system, allowing organic pigment to bind tightly with the matrix, avoiding pigment precipitation and agglomeration. During the curing process, it is not easy to migrate, settle or float, resulting in uniform color of the final product. Furthermore, solid silicone resin itself has excellent high and low temperature resistance, excellent electrical insulation and excellent flame retardancy. It produces very little smoke when burning and is resistant to dilute acid, ozone and chemical corrosion. The 10-30 mol% phenyl content ensures that the solid silicone resin has a suitable phenyl content, avoiding the problem of poor compatibility between organic pigment and matrix due to too low phenyl content. However, when the phenyl content is too high, the large phenyl groups will generate huge steric hindrance, causing the molecular chain segments to change from flexible to rigid, resulting in excessive brittleness of the colored flame retardant silicone resin, which in turn leads to cracking of the prepared colored flame retardant silicone resin. Therefore, by compounding solid silicone resin and liquid silicone resin, a "one agent, multiple effects" functional integrated system was constructed. Solid silicone resin with 10-30 mol% phenyl content participates in the curing reaction of liquid silicone resin as a functional filler, while also taking into account multiple functions such as flame retardant synergy and heat resistance enhancement. This can significantly improve the comprehensive performance of the material, break through the technical barrier of mutual exclusion between "color, flame retardancy and heat resistance", and for the first time achieve the simultaneous compliance of colored glass fiber sleeve with VW-1 flame retardant standard and temperature resistance requirement above 200℃. This enables the prepared colored flame retardant silicone resin to achieve flame retardant and heat resistance performance and has a variety of durable colors, while being safe and environmentally friendly.

[0022] Understandably, the liquid silicone resin is 140-220 parts, and the number of parts can be any number between 140, 150, 160, 170, 180, 190, 200, 210, 220, etc.; the solid silicone resin is 10-40 parts, and the number of parts can be any number between 10, 20, 30, 40, etc.; the organic heat-resistant color paste is 2-10 parts, and the number of parts can be any number between 2, 3, 6, 8, 10, etc.

[0023] Solid silicone resin is a phenyl solid silicone resin, in which the phenyl group is linked to the aromatic heterocycle in the organic pigment. Solid silicone resin itself is compatible with liquid silicone resin. The content of phenyl groups determines key properties such as the compatibility of the matrix resin with the organic pigment, hardness, and heat resistance. Excessive phenyl content will lead to excessive stiffness in the prepared colored flame-retardant silicone resin. On the other hand, the introduction of phenyl groups will increase the refractive index of the silicone resin, reduce optical scattering, and achieve high transparency. Therefore, selecting appropriate phenyl groups can effectively improve the compatibility of organic pigments in colored flame-retardant silicone resin while ensuring its excellent mechanical properties, ensuring an excellent processing window, avoiding premature gelation, and achieving controllable curing that is both economical and practical.

[0024] Understandably, the phenyl content is 10-30 mol%, and its content can be any percentage between 10-30 mol%, such as 10%, 15%, 20%, 25%, 30%, etc.

[0025] In some embodiments, the solid silicone resin is one or more of methylphenyl silicone resin, high softening point phenyl silicone resin intermediate, phenyl MQ silicone resin, and special epoxy / polyester modified solid silicone resin, preferably methylphenyl silicone resin.

[0026] In some embodiments, the solid silicone resin is preferably a methylphenyl solid silicone resin.

[0027] In some embodiments, the phenyl content in the solid silicone resin is preferably 20 mol.

[0028] Furthermore, the liquid silicone resin comprises 120-160 parts of vinyl-terminated polysiloxane and 20-60 parts of methyl-terminated polysiloxane.

[0029] Understandably, the vinyl-terminated polysiloxane is 120-160 parts, and the number of parts can be any number between 120, 130, 140, 150, or 160. The methyl-terminated polysiloxane is 20-60 parts, and the number of parts can be any number between 20, 30, 40, 50, or 60. The vinyl-terminated polysiloxane forms the main three-dimensional network of the elastomer, and the vinyl ends are the "anchor points" for the curing reaction, which can significantly improve the cohesive strength, hardness, and heat resistance of the material, and significantly reduce the linear shrinkage rate, enhancing the adhesion to the substrate. The methyl-terminated polysiloxane is a performance modifier in the main three-dimensional network, which can prevent the mechanical properties of colored flame-retardant silicone resins from being too poor.

[0030] In some embodiments, the vinyl-terminated polysiloxane is at least one of vinyl-terminated polydimethylsiloxane, vinyl-terminated polymethylvinylsiloxane, or T-type or cage-type polysiloxane, preferably vinyl-terminated polydimethylsiloxane.

[0031] In some embodiments, the methyl-terminated polysiloxane is at least one of trimethylsiloxy-terminated polydimethylsiloxane, methyl-terminated polymethylhydrosiloxane, hydrogen-containing monomethyl-terminated polysiloxane, and alkoxy-terminated polysiloxane, preferably dimethyl silicone oil.

[0032] Furthermore, the organic heat-resistant color paste includes silicone oil and organic pigments, wherein the organic pigments are azo pigments, lake pigments, heterocyclic pigments, fused-ring ketone pigments, or phthalocyanine pigments, or two or more of the following: azo pigments, lake pigments, heterocyclic pigments, fused-ring ketone pigments, and phthalocyanine pigments.

[0033] Organic heat-resistant pigments use organic pigments as the main coloring component. The chemical structure of the pigment determines its stability at high temperatures. Heterocyclic and fused-ring organic pigments have large-area conjugated aromatic structures. In the aromatic ring structure, the conjugation of electron clouds generates mutually attractive van der Waals forces, i.e., π-π stacking. For azo pigments, which are water-insoluble organic compounds containing azo groups (—N=N—) in their molecular structure, the azo group attached to the aromatic ring is the core chromophore unit, connecting an aromatic diazo component and a coupling component to form a conjugated system. Lake pigments precipitate organic dyes on an inorganic carrier, and their chromophores originate from the intramolecular conjugated system. Heterocyclic and fused-ring organic pigments possess π-electrode... The conjugated system is the basis for color generation. Due to its large size, the molecular structure is very stable. The groups in the molecule enable strong intermolecular hydrogen bonding between pigment molecules, thereby enhancing the overall structural stability. Phthalocyanine pigments are dyes with a porphyrin ring structure composed of four pyrrole cores. According to molecular orbital theory, this conjugated system has strong stability. The solid silicone resin is a phenyl solid silicone resin. The phenyl group (-C6H5) in the solid silicone resin is a typical aromatic ring. It specifically adsorbs onto the aromatic ring of the organic pigment through π-π stacking, thereby anchoring the organic pigment in the solid silicone resin. This significantly improves the compatibility of the organic pigment, thus enabling the preparation of colored glass fiber sleeves in various colors.

[0034] In some embodiments, the organic pigment is preferably an azo pigment.

[0035] Furthermore, the organic pigment content is 25-45%, the particle size is ≤3um, and the temperature resistance is ≥250℃.

[0036] When the organic pigment content is 25-45%, it can ensure that the organic pigment maintains high tinting strength while adding a small amount, and control the input cost of organic pigment, avoiding uneven dispersion or particle agglomeration caused by excessive addition. In organic pigments, the smaller the pigment particle size, the larger its specific surface area. It can be understood that the larger the specific surface area, the more active sites are exposed, and photons are more easily absorbed and converted into other forms of energy. This means that the pigment has a higher absorption and scattering efficiency of light, which can significantly improve tinting strength and color saturation. However, excessively small particle size is more susceptible to ultraviolet erosion, which will lead to a decrease in the weather resistance of organic pigments. Therefore, organic pigment particle size ≤3um can ensure tinting strength while improving its weather resistance.

[0037] In some embodiments, the organic pigment content is preferably 30%.

[0038] Furthermore, the azo pigments are acetylacetylarylamine-insoluble monoazo pigments, biphenylamine and pyrazolone-insoluble diazo pigments, β-naphthol pigments, naphthol AS pigments, azo condensation pigments, or benzimidazole ketone pigments, or two or more of the following: acetylacetylarylamine-insoluble monoazo pigments, biphenylamine and pyrazolone-insoluble diazo pigments, β-naphthol pigments, naphthol AS pigments, azo condensation pigments, or benzimidazole ketone pigments; the lake pigments are acetylacetylarylamine and pyrazolone azo lake pigments, 2-naphthol and 2-hydroxy-3-naphthoic acid series lake pigments, or naphthol AS lake pigments, or acetylacetylarylamine and pyrazolone azo lake pigments, 2-naphthol and 2-hydroxy-3-naphthoic acid series lake pigments, or naphthol... Two or more of the following are AS-type lake pigments: heterocyclic pigments include dioxazine pigments, 1,4-diketone-pyrrolopyrrole (DPP) pigments, quinacridone pigments, isoindolineone and isoindoline pigments, or quinophthalone pigments; polycyclic ketone pigments include two or more of the following: perylene pigments, anthraquinone pigments, pyrene pigments, or thioindigo pigments; phthalocyanine pigments include copper phthalocyanine pigments, halogenated copper phthalocyanine pigments, metal-free phthalocyanine pigments, or phthalocyanine lake pigments; or two or more of the following: copper phthalocyanine pigments, halogenated copper phthalocyanine pigments, metal-free phthalocyanine pigments, or phthalocyanine lake pigments.

[0039] Azo pigments, lake pigments, heterocyclic pigments, fused-ring ketone pigments, and phthalocyanine pigments all contain conjugated systems that specifically adsorb onto the phenyl groups in solid silicone resins through π-π stacking, thereby anchoring them in the solid silicone resins. Furthermore, the polarity is adjustable, which can significantly improve the compatibility of organic pigments.

[0040] In some embodiments, the monoazo pigment is preferably Pigment Red 48:3.

[0041] In some embodiments, the monoazo pigment is preferably Pigment Orange 36 (PO36).

[0042] In some embodiments, the acetylacetylaramine insoluble monoazo pigment is preferably PY128 (pigment yellow 128).

[0043] In some embodiments, the biphenylamine-insoluble diazo pigment is preferably PY110 (pigment yellow 110).

[0044] In some embodiments, pyrazolone-insoluble diazo pigments are preferably CI Pigment Red 208 (PR208).

[0045] In some embodiments, β-naphthol pigments are preferably Pigment Orange 5 PO5, CI 12075.

[0046] In some embodiments, the naphthol AS pigment is preferably CI Pigment Red 187 (PR 187).

[0047] In some embodiments, the azo condensation pigment is preferably PY93 (pigment yellow 93).

[0048] In some embodiments, benzimidazole ketone pigments are preferably CI Pigment Yellow 154.

[0049] In some embodiments, benzimidazole ketone pigments are preferably CI Pigment Brown 25.

[0050] In some embodiments, the acetylacetylaramine azo lake pigment is preferably CI Pigment Yellow 155 (PY155).

[0051] In some embodiments, pyrazolone azo lake pigments are preferably Pigment Yellow 191 (PY191).

[0052] In some embodiments, 2-naphthol and 2-hydroxy-3-naphthoic acid series lake pigments are preferably CI Pigment Red 53:1 (PR53:1).

[0053] In some embodiments, the Naphthophenol AS-based lake pigment is preferably Pigment Red 151 (PR 151).

[0054] In some embodiments, the dioxazine pigment is preferably Pigment Violet 23.

[0055] In some embodiments, the dioxazine pigment is preferably Pigment Violet 37 (PV37).

[0056] In some embodiments, DPP-type pigments are preferably CI Pigment Red 254.

[0057] In some embodiments, DPP-type pigments are preferably Pigment Orange 71 (PO71).

[0058] In some embodiments, the quinacridone pigment is preferably red quinacridone red CI Pigment Red 122.

[0059] In some embodiments, the quinacridone pigment is preferably Pigment Violet 19 (PV19).

[0060] In some embodiments, the isoindolinone pigment is preferably yellow-orange CI pigment orange 61.

[0061] In some embodiments, the isoindolinone pigment is preferably green-yellow pigment yellow 109 (PY 109).

[0062] In some embodiments, the perylene pigment is preferably Pigment Violet 29 (CI 71129).

[0063] In some embodiments, the perylene pigment is preferably Perylene Orange CI Pigment Orange 43.

[0064] In some embodiments, the perylene pigment is preferably green-phase black CI pigment black 32.

[0065] In some embodiments, anthraquinone pigments are preferably PR 226 (pigment red 226).

[0066] In some embodiments, pyrene pigments are preferably PO.51 (anthraquinone orange) >200°C.

[0067] In some embodiments, the sulfur-indigo pigment is preferably Pigment Red 88.

[0068] In some embodiments, copper phthalocyanine pigments are preferably green phthalocyanine green (CI) Pigment Green 7.

[0069] In some embodiments, the copper phthalocyanine halogenated pigment is preferably Pigment Green 36 (PG 36) Phthalocyanine Green 3G / 6G.

[0070] In some embodiments, the metal-free phthalocyanine pigment is preferably Pigment Blue 16 (PB 16).

[0071] In some embodiments, the phthalocyanine pigment is preferably Phthalocyanine Blue CI Pigment Blue 15:4.

[0072] Furthermore, the colored flame-retardant silicone resin also includes 10-30 parts of fumed silica, 0.1-0.5 parts of platinum catalyst, 5-15 parts of crosslinking agent, and 0.05-0.3 parts of inhibitor. The fumed silica is hydrophobically treated with hexamethyldisilazane.

[0073] The addition of fumed silica ensures high strength for colored flame-retardant silicone resins. After hydrophobic treatment, the fumed silica prevents its surface hydroxyl groups from interfering with the catalyst, allowing it to chemically bond with the silicone resin matrix, thereby improving its strength.

[0074] Furthermore, the platinum catalyst is a platinum-vinylsiloxane complex, a platinum-alkynyl group complex, or an alcohol-modified chloroplatinic acid, or two or more of the following: platinum-vinylsiloxane complex, platinum-alkynyl group complex, and alcohol-modified chloroplatinic acid, with a platinum content (calculated as Pt) of 3000-5000 ppm.

[0075] Platinum catalysts can initiate and catalyze key hydrosilylation reactions. Platinum atoms can accurately recognize and activate the vinyl groups in component A resin and the silane bonds in component B resin, catalyzing the entire addition reaction without producing any byproducts. They are highly active, requiring only a small amount to achieve efficient catalysis, and are stable in nature.

[0076] In some embodiments, the platinum catalyst is preferably a Castells platinum catalyst, and the platinum content (in Pt) is preferably 4000 ppm.

[0077] Furthermore, the crosslinking agent is at least one of methyl hydrogen polysiloxane, ethyl hydrogen polysiloxane, hydroxyl hydrogen polysiloxane, and epoxy hydrogen polysiloxane, with a viscosity of 50-500 mPa.s and a Si-H content of 0.5-1.2 mmol / g; the inhibitor is at least one of ethynylcyclohexanol, diallyl maleate, and tetravinyltetramethyltetrasiloxane.

[0078] Crosslinking agents enable solid and liquid silicone resins to form a three-dimensional network, transforming the material from a liquid to a solid state and achieving mechanical properties such as high elasticity and tear resistance; inhibitors can suppress the activity of catalysts, preventing component A resin and component B resin from reacting and curing immediately after mixing at room temperature.

[0079] In some embodiments, the crosslinking agent is preferably a methyl hydrogen polysiloxane.

[0080] In some embodiments, the inhibitor is preferably ethynylcyclohexanol.

[0081] This invention also proposes a method for preparing the colored flame-retardant silicone resin as described above, comprising the following steps: Preparation of component A resin: Mix 60-80 parts of vinyl-terminated polysiloxane and 10-30 parts of methyl-terminated polysiloxane, stir until uniform, add 5-20 parts of solid silicone resin, stir at 160℃-180℃ for 15-20 min, stir until uniform, add 5-15 parts of fumed silica, then stir under vacuum for 20-30 min, when the temperature drops below 40℃, add 0.1-0.5 parts of platinum catalyst and stir until uniform to obtain component A resin; Preparation of component B resin: Mix 60-80 parts of vinyl-terminated polysiloxane and 10-30 parts of methyl-terminated polysiloxane, stir until uniform, add 5-20 parts of solid silicone resin, stir at 160℃-180℃ for 15-20 min, stir until uniform, add 5-15 parts of fumed silica, then stir under vacuum for 20-30 min. When the temperature drops below 40℃, add 5-15 parts of crosslinking agent and 0.05-0.3 parts of inhibitor, stir until uniform to obtain component B resin; The colored flame-retardant silicone resin is obtained by mixing component A resin, component B resin and organic heat-resistant color paste in a ratio of 100:100:2-10.

[0082] In some embodiments, when preparing component A resin, vinyl-terminated polysiloxane and methyl-terminated polysiloxane are added according to the formula ratio and stirred at 100-130°C for 5-10 min at a speed of 20-30 rpm; solid silicone resin is added in portions and stirred at 160-180°C for 15-20 min; then silica is added in portions and stirred for 20-30 min; the temperature is lowered to 50-60°C, and a vacuum of 0.08 MPa is applied for 20-30 min; the temperature is lowered to below 40°C, and platinum complex is added and stirred for 5-10 min; after returning to room temperature, it is filtered through a 100-200 mesh filter, packaged, sealed, and stored for later use.

[0083] In some embodiments, when preparing component B resin, vinyl-terminated polysiloxane and methyl-terminated polysiloxane are added according to the formulation ratio and stirred at 100-130°C for 5-10 min at a speed of 20-30 rpm; solid silicone resin is added in portions and stirred at 160-180°C for 15-20 min; then silica is added in portions and stirred for 20-30 min; the temperature is lowered to 50-60°C, and a vacuum of 0.08 MPa is applied for 20-30 min; the temperature is lowered to below 40°C, and hydrogen-containing polysiloxane is added and stirred for 5-10 min; then an inhibitor is added and stirred for 5-10 min; after returning to room temperature, the mixture is filtered through a 100-200 mesh filter, packaged, sealed, and stored for later use.

[0084] Component A resin is a blend of solid and liquid silicone resins. The solid silicone resin comprises 5-20 parts by weight, of which vinyl-terminated polysiloxane comprises 60-80 parts by weight. Vinyl-terminated polysiloxane forms the main three-dimensional network of the elastomer, with the vinyl ends acting as "anchors" for the curing reaction. This significantly improves the material's cohesive strength, hardness, and heat resistance, while also significantly reducing linear shrinkage and enhancing adhesion to the substrate. Methyl-terminated polysiloxane comprises 10-30 parts by weight and acts as a performance modifier within the main three-dimensional network. Adding an appropriate amount of methyl-terminated polysiloxane... Polysiloxanes can prevent the mechanical properties of colored flame-retardant silicone resins from being too poor. Understandably, vinyl-terminated polysiloxanes are 60-80 parts, and the number of parts can be any number between 60 and 80 parts; methyl-terminated polysiloxanes are 10-30 parts, and the number of parts can be any number between 10 and 30 parts; solid silicone resins are 5-20 parts, and the number of parts can be any number between 5 and 20 parts.

[0085] In both component A and component B resins, the weight proportions of solid and liquid silicone resins are equal. Compared to component A resin, component B resin does not contain a catalyst but includes a crosslinking agent and an inhibitor. This separate design of the catalyst and crosslinking agent prevents the matrix resin from undergoing a crosslinking reaction at room temperature. The inhibitor suppresses the catalyst's activity at room temperature, ensuring sufficient working time for both component A and component B resins after mixing, preventing "dead material." This separate design also guarantees an operating window during the preparation process, facilitating control of the curing process. Understandably, at room temperature, the inhibitor suppresses catalyst activity, stabilizing the system after mixing component A and component B resins. Upon heating, as the temperature rises, the inhibitor's effect gradually decreases, while the catalyst gradually participates in the curing reaction. Once the temperature reaches a certain range, the catalyst rapidly participates in the reaction, allowing the matrix resin to complete the curing process and build a uniform crosslinking network. The crosslinking agent is evenly distributed throughout the matrix resin, avoiding uneven hardness or surface stickiness caused by localized uneven concentrations, ensuring the uniformity of the mixture and the excellent mechanical properties of the colored flame-retardant silicone resin.

[0086] The present invention also proposes a colored flame-retardant silicone resin glass fiber sleeve, which is prepared from any of the colored flame-retardant silicone resins mentioned above.

[0087] This invention also proposes a method for preparing a colored flame-retardant silicone resin glass fiber sleeve, comprising the following steps: The prepared colored flame-retardant silicone resin was coated onto the surface of the glass fiber braided sleeve. The coated glass fiber braided sleeve was then shaped at high temperature, cured at a constant temperature, cooled to room temperature, and then pulled and wound to obtain the colored flame-retardant silicone resin glass fiber sleeve.

[0088] Colored flame-retardant silicone resin is directly coated onto the surface of a glass fiber braided sleeve using a coating device under heating conditions of 100-100℃. The thickness of the colored flame-retardant silicone resin coating is controlled within 0.2-1mm using a sizing mold. The coated glass fiber braided sleeve is then sent into a 400-500℃ drying tunnel for shaping, and then passed through a continuous drying tunnel at 180-260℃ for constant temperature curing for 20-90 minutes. After curing, the sleeve is cooled to room temperature by cooling rollers, and then pulled and wound to obtain the colored flame-retardant silicone resin glass fiber sleeve.

[0089] Understandably, if the colored flame-retardant silicone resin coating is too thin, it will crack under external force when bent or deformed, thus losing its protective function. However, if the coating is too thick, it will hinder the bending of the fiberglass sleeve. In addition, silicone resin is expensive. If the coating thickness is increased from 0.2 mm to 1 mm, the material usage will increase fivefold. Therefore, choosing the minimum feasible thickness according to the pressure resistance and wear resistance requirements of the final product is the key to controlling costs.

[0090] In some embodiments, the coating thickness is controlled at 0.3 mm.

[0091] The following specific embodiments and data explain the content of the present invention.

[0092] Information on the raw materials involved in the specific implementation method is shown in Table 1: Table 1 Information on raw materials for the examples and comparative examples

[0093] Example 1: The raw materials of colored flame-retardant silicone resin, by weight, include 120 parts of vinyl-terminated polysiloxane 40 parts of methyl-terminated polysiloxane 10 parts of phenyl solid silicone resin Two parts of organic heat-resistant pigment. 20 parts of fumed silica 0.1 parts platinum catalyst 5 parts crosslinking agent Inhibitor 0.05 parts.

[0094] The preparation method is as follows: 60 parts of vinyl-terminated polysiloxane and 20 parts of methyl-terminated polysiloxane were mixed and stirred. After the mixture was homogeneous, 5 parts of phenyl solid silicone resin 1 were added and stirred at 170°C for 15 min. After the mixture was homogeneous, 10 parts of fumed silica were added and stirred under vacuum for 25 min. When the temperature dropped below 40°C, 0.1 parts of platinum catalyst were added and stirred until homogeneous to obtain component A resin 1. 60 parts of vinyl-terminated polysiloxane and 20 parts of methyl-terminated polysiloxane were mixed and stirred. After the mixture was homogeneous, 5 parts of phenyl solid silicone resin 1 were added and stirred at 170°C for 15 min. After the mixture was homogeneous, 10 parts of fumed silica were added and stirred under vacuum for 25 min. When the temperature dropped below 40°C, 5 parts of crosslinking agent and 0.05 parts of inhibitor were added and stirred until homogeneous to obtain component B resin 1. Adding 30% Pigment Red 48:3 to silicone oil yields organic heat-resistant color paste 1; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 1, component B resin 1 and organic heat-resistant color paste 1 in a ratio of 100:100:2.

[0095] Example 2: The preparation method is the same as in Example 1, except that: Component A, Resin 2, is formulated as follows: 80 parts vinyl-terminated polysiloxane, 30 parts methyl-terminated polysiloxane, 10 parts phenyl solid silicone resin 2, 5 parts fumed silica, and 0.5 parts platinum catalyst. Component B, Resin 2, is formulated as follows: 80 parts vinyl-terminated polysiloxane, 30 parts methyl-terminated polysiloxane, 10 parts phenyl solid silicone resin 2, 5 parts fumed silica, 10 parts crosslinking agent, and 0.15 parts inhibitor. The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 2, component B resin 2 and organic heat-resistant color paste 1 in a ratio of 100:100:5.

[0096] Example 3: The preparation method is the same as in Example 1, except that: Component A resin 3 is formulated as follows: 70 parts vinyl-terminated polysiloxane, 10 parts methyl-terminated polysiloxane, 20 parts phenyl solid silicone resin 3, 15 parts fumed silica, and 0.3 parts platinum catalyst. Component B resin 3 is formulated as follows: 70 parts vinyl-terminated polysiloxane, 10 parts methyl-terminated polysiloxane, 20 parts phenyl solid silicone resin 3, 15 parts fumed silica, 15 parts crosslinking agent, and 0.3 parts inhibitor. The colored flame-retardant silicone resin is obtained by mixing component A resin 3, component B resin 3 and organic heat-resistant color paste 1 in a ratio of 100:100:10.

[0097] Example 4: The preparation method is the same as in Example 1, except that: Component A, Resin 4, is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 1, 10 parts fumed silica, and 0.3 parts platinum catalyst. Component B resin 4 is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 1, 10 parts fumed silica, 10 parts crosslinking agent, and 0.2 parts inhibitor. The colored flame-retardant silicone resin is obtained by mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 1 in a ratio of 100:100:6.

[0098] Example 5: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Orange 36 to silicone oil yields Organic Heat-Resistant Pigment 2; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 2 in a ratio of 100:100:6.

[0099] Example 6: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Yellow 128 to silicone oil yields organic heat-resistant color paste 3; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 3 in a ratio of 100:100:6.

[0100] Example 7: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Yellow 110 to silicone oil yields organic heat-resistant color paste 4; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 4 in a ratio of 100:100:6.

[0101] Example 8: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Red 208 to silicone oil yields organic heat-resistant pigment 5; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 5 in a ratio of 100:100:6.

[0102] Example 9: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Orange 5 to silicone oil yields an organic heat-resistant color paste 6; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 6 in a ratio of 100:100:6.

[0103] Example 10: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Red 187 to silicone oil yields organic heat-resistant color paste 7; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 7 in a ratio of 100:100:6.

[0104] Example 11: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Yellow 93 to silicone oil yields organic heat-resistant color paste 8; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 8 in a ratio of 100:100:6.

[0105] Example 12: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Yellow 154 to silicone oil yields organic heat-resistant color paste 9; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 9 in a ratio of 100:100:6.

[0106] Example 13: The preparation method is the same as in Example 4, except that: Adding 30% of pigment brown 25 to silicone oil yields organic heat-resistant pigment paste 10; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 10 in a ratio of 100:100:6.

[0107] Example 14: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Yellow 155 to silicone oil yields Organic Heat-Resistant Pigment Paste 11; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 11 in a ratio of 100:100:6.

[0108] Example 15: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Yellow 191 to silicone oil yields Organic Heat-Resistant Pigment Paste 12; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 12 in a ratio of 100:100:6.

[0109] Example 16: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Red (53:1) to silicone oil yields Organic Heat-Resistant Pigment Paste 13; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 13 in a ratio of 100:100:6.

[0110] Example 17: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Red 151 to silicone oil yields organic heat-resistant pigment 14; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 14 in a ratio of 100:100:6.

[0111] Example 18: The preparation method is the same as in Example 4, except that: Adding 30% of pigment Violet 23 to silicone oil yields organic heat-resistant pigment paste 15; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 15 in a ratio of 100:100:6.

[0112] Example 19: The preparation method is the same as in Example 4, except that: Adding 30% of red violet 37 to silicone oil yields organic heat-resistant color paste 16; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 16 in a ratio of 100:100:6.

[0113] Example 20: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Red 254 to silicone oil yields organic heat-resistant pigment 17; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 17 in a ratio of 100:100:6.

[0114] Example 21: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Orange 71 to silicone oil yields Organic Heat-Resistant Pigment Paste 18; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 18 in a ratio of 100:100:6.

[0115] Example 22: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Red 122 to silicone oil yields organic heat-resistant pigment 19; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 19 in a ratio of 100:100:6.

[0116] Example 23: The preparation method is the same as in Example 4, except that: Adding 30% of pigment Violet 19 to silicone oil yields organic heat-resistant pigment paste 20; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 20 in a ratio of 100:100:6.

[0117] Example 24: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Orange 61 to silicone oil yields Organic Heat-Resistant Pigment Paste 21; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 21 in a ratio of 100:100:6.

[0118] Example 25: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Yellow 109 to silicone oil yields Organic Heat-Resistant Pigment Paste 22; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 22 in a ratio of 100:100:6.

[0119] Example 26: The preparation method is the same as in Example 4, except that: Adding 30% of pigment violet 29 to silicone oil yields organic heat-resistant pigment 23; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 23 in a ratio of 100:100:6.

[0120] Example 27: The preparation method is the same as in Example 4, except that: Adding 30% of pigment orange 43 to silicone oil yields organic heat-resistant pigment 24; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 24 in a ratio of 100:100:6.

[0121] Example 28: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Black 32 to silicone oil yields Organic Heat-Resistant Pigment Paste 25; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 25 in a ratio of 100:100:6.

[0122] Example 29: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Red 226 to silicone oil yields Organic Heat-Resistant Pigment Paste 26; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 26 in a ratio of 100:100:6.

[0123] Example 30: The preparation method is the same as in Example 4, except that: Adding 30% anthraquinone orange 51 to silicone oil yields organic heat-resistant color paste 27; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 27 in a ratio of 100:100:6.

[0124] Example 31: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Red 88 to silicone oil yields Organic Heat-Resistant Pigment Paste 28; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 28 in a ratio of 100:100:6.

[0125] Example 32: The preparation method is the same as in Example 4, except that: Adding 30% of green phthalocyanine green 7 to silicone oil yields organic heat-resistant color paste 29; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 29 in a ratio of 100:100:6.

[0126] Example 33: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Green 36 to silicone oil yields Organic Heat-Resistant Pigment 30; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 30 in a ratio of 100:100:6.

[0127] Example 34: The preparation method is the same as in Example 4, except that: Adding 30% of Pigment Blue 16 to silicone oil yields organic heat-resistant pigment 31; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 31 in a ratio of 100:100:6.

[0128] Example 35: The preparation method is the same as in Example 4, except that: Adding 30% of blue phthalocyanine blue (15:4) to silicone oil yields organic heat-resistant color paste 32; The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 32 in a ratio of 100:100:6.

[0129] Comparative Example 1: The preparation method is the same as in Example 1, except that: Component A, Resin 4, is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 1, 10 parts fumed silica, and 0.3 parts platinum catalyst. Component B resin 4 is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 1, 10 parts fumed silica, 10 parts crosslinking agent, and 0.2 parts inhibitor. The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 1 in a ratio of 100:100:0.

[0130] Comparative Example 2: The preparation method is the same as in Example 1, except that: Component A, Resin 4, is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 1, 10 parts fumed silica, and 0.3 parts platinum catalyst. Component B resin 4 is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 1, 10 parts fumed silica, 10 parts crosslinking agent, and 0.2 parts inhibitor. The colored flame-retardant silicone resin is obtained by mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 1 in a ratio of 100:100:1.

[0131] Comparative Example 3: The preparation method is the same as in Example 1, except that: Component A, Resin 4, is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 1, 10 parts fumed silica, and 0.3 parts platinum catalyst. Component B resin 4 is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 1, 10 parts fumed silica, 10 parts crosslinking agent, and 0.2 parts inhibitor. The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 1 in a ratio of 100:100:13.

[0132] Comparative Example 4: The preparation method is the same as in Example 1, except that: Component A, Resin 5, is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 1 part phenyl solid silicone resin 1, 10 parts fumed silica, and 0.3 parts platinum catalyst. Component B resin 4 is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 1, 10 parts fumed silica, 10 parts crosslinking agent, and 0.2 parts inhibitor. The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 5, component B resin 4 and organic heat-resistant color paste 1 in a ratio of 100:100:6.

[0133] Comparative Example 5: The preparation method is the same as in Example 1, except that: Component A, Resin 6, is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 25 parts phenyl solid silicone resin 1, 10 parts fumed silica, and 0.3 parts platinum catalyst. Component B resin 4 is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 1, 10 parts fumed silica, 10 parts crosslinking agent, and 0.2 parts inhibitor. The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 6, component B resin 4 and organic heat-resistant color paste 1 in a ratio of 100:100:6.

[0134] Comparative Example 6: The preparation method is the same as in Example 1, except that: Component A, Resin 4, is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 1, 10 parts fumed silica, and 0.3 parts platinum catalyst. Component B resin 5 is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 1 part phenyl solid silicone resin 1, 10 parts fumed silica, 10 parts crosslinking agent, and 0.2 parts inhibitor. The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 5 and organic heat-resistant color paste 1 in a ratio of 100:100:6.

[0135] Comparative Example 7: The preparation method is the same as in Example 1, except that: Component A, Resin 4, is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 1, 10 parts fumed silica, and 0.3 parts platinum catalyst. Component B, Resin 6, is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 25 parts solid silicone resin 1, 10 parts fumed silica, 10 parts crosslinking agent, and 0.2 parts inhibitor. The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 6 and organic heat-resistant color paste 1 in a ratio of 100:100:6.

[0136] Comparative Example 8: The preparation method is the same as in Example 4, except that: The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 1 in a ratio of 80:100:6.

[0137] Comparative Example 9: The preparation method is the same as in Example 4, except that: The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 4 in a ratio of 100:90:6.

[0138] Comparative Example 10: The preparation method is the same as in Example 4, except that: The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 1 in a ratio of 110:100:6.

[0139] Comparative Example 11: The preparation method is the same as in Example 4, except that: The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 4, component B resin 4 and organic heat-resistant color paste 1 in a ratio of 100:120:6.

[0140] Comparative Example 12: The preparation method is the same as in Example 1, except that: Component A resin 7 is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 0 parts phenyl solid silicone resin 1, 10 parts fumed silica, and 0.3 parts platinum catalyst. Component B resin 7 is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 0 parts phenyl solid silicone resin 1, 10 parts fumed silica, 10 parts crosslinking agent, and 0.2 parts inhibitor. The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 7, component B resin 7 and organic heat-resistant color paste 1 in a ratio of 100:100:6.

[0141] Comparative Example 13: The preparation method is the same as in Example 1, except that: Component A resin 8 is formulated as follows: 50 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 1, 10 parts fumed silica, and 0.3 parts platinum catalyst. Component B resin 8 is formulated as follows: 50 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 1, 10 parts fumed silica, 10 parts crosslinking agent, and 0.2 parts inhibitor. The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 8, component B resin 8 and organic heat-resistant color paste 1 in a ratio of 100:100:6.

[0142] Comparative Example 14: The preparation method is the same as in Example 1, except that: Component A, Resin 9, is formulated as follows: 90 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 1, 10 parts fumed silica, and 0.3 parts platinum catalyst. Component B resin 9 is formulated as follows: 90 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 5 parts phenyl solid silicone resin 1, 10 parts fumed silica, 10 parts crosslinking agent, and 0.2 parts inhibitor. The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 9, component B resin 9 and organic heat-resistant color paste 1 in a ratio of 100:100:6.

[0143] Comparative Example 15: The preparation method is the same as in Example 1, except that: Component A, Resin 10, is formulated as follows: 70 parts vinyl-terminated polysiloxane, 5 parts methyl-terminated polysiloxane, 15 parts solid silicone resin 1, 10 parts fumed silica, and 0.3 parts platinum catalyst. Component B resin 10 is formulated as follows: 70 parts vinyl-terminated polysiloxane, 5 parts methyl-terminated polysiloxane, 15 parts solid silicone resin 1, 10 parts fumed silica, 10 parts crosslinking agent, and 0.2 parts inhibitor. The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 10, component B resin 10 and organic heat-resistant color paste 1 in a ratio of 100:100:6.

[0144] Comparative Example 16: The preparation method is the same as in Example 1, except that: Component A resin 11 is formulated as follows: 70 parts vinyl-terminated polysiloxane, 40 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 1, 10 parts fumed silica, and 0.3 parts platinum catalyst. Component B resin 11 is formulated as follows: 70 parts vinyl-terminated polysiloxane, 40 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 1, 10 parts fumed silica, 10 parts crosslinking agent, and 0.2 parts inhibitor. The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 11, component B resin 11 and organic heat-resistant color paste 1 in a ratio of 100:100:6.

[0145] Comparative Example 17: The preparation method is the same as in Example 1, except that: Component A resin 12 is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts methyl solid silicone resin, 10 parts fumed silica, and 0.3 parts platinum catalyst. Component B resin 12 is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts methyl solid silicone resin, 10 parts fumed silica, 10 parts crosslinking agent, and 0.2 parts inhibitor. The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 12, component B resin 12 and organic heat-resistant color paste 1 in a ratio of 100:100:6.

[0146] Comparative Example 18: The preparation method is the same as in Example 1, except that: Component A resin 13 is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 4, 10 parts fumed silica, and 0.3 parts platinum catalyst. Component B resin 13 is formulated as follows: 70 parts vinyl-terminated polysiloxane, 20 parts methyl-terminated polysiloxane, 15 parts phenyl solid silicone resin 4, 10 parts fumed silica, 10 parts crosslinking agent, and 0.2 parts inhibitor. The colored flame-retardant silicone resin is obtained by uniformly mixing component A resin 13, component B resin 13 and organic heat-resistant color paste 1 in a ratio of 100:100:6.

[0147] The resin components of component A and component B in Examples 1-35 and Comparative Examples 1-18 are summarized in Tables 2 and 3.

[0148] Table 2. Components of Resin A in Examples 1-35 and Comparative Examples 1-18

[0149] Table 3. Composition of component B resin in Examples 1-35 and Comparative Examples 1-18

[0150] Table 4. Components in Examples 1-35 and Comparative Examples 1-18

[0151] According to UL1441 and ASTMD2244, the silicone resin-coated fiberglass tubes in Examples 1-35 and Comparative Examples 1-18 were tested for flame retardancy (VW-1), breakdown voltage after aging, thermal shock at 250℃ for 6 hours, and color difference after aging at 200℃. The test methods are as follows: (1) Flame retardant VW-1 Take three 660mm long glass fiber tubes and insert 0.74mm wires inside them; clamp the upper end of the sample and the wires to the support, and pass the lower end of the wires through the bottom of the sample and fix it to the support; ignite the sample five times for 15s and extinguish it for 15s (if the flame of the sample is not extinguished within 15s, wait until the flame is completely extinguished before igniting it again), and record the flame extension time after each removal from the flame.

[0152] (2) Breakdown voltage test after aging Take three 300mm sections of fiberglass tubes and suspend them vertically in a 265℃ thermal aging test chamber. After 168 hours, remove the samples. Once the samples have cooled to room temperature, select a copper rod with an inner diameter similar to that of the fiberglass tubes and insert the copper rod into the fiberglass tubes so that the fiberglass tubes are in the middle of the copper rods. Wrap a 150mm long aluminum foil around the middle of the fiberglass tubes as one electrode, and use the copper rod as the other electrode. Between the two electrodes, starting from the lowest voltage of 0V, apply an AC voltage with a step-up rate not exceeding 500V / s until breakdown occurs, and record the breakdown voltage.

[0153] (3) Thermal shock test at 250℃ for 6 hours Take three 150mm samples and suspend them vertically in a 250℃ thermal aging test chamber. After 6 hours, remove the samples and observe whether they exhibit viscous flow or dripping. After the samples have cooled to room temperature, wrap them 360° around a 7.9mm diameter mandrel within 3 seconds and observe whether cracks appear.

[0154] (4) Color difference test after aging at 265℃ for 168h Three 300mm long fiberglass tubes were taken and marked at three positions (front, middle, and back) on each tube. The color data (L1, a1, b1) at these three positions were measured using a colorimeter. The tubes were vertically suspended in a 265℃ heat aging test chamber and left for 168 hours. After the samples cooled to room temperature, the color data (L2, a2, b2) at the front, middle, and back positions of each sample were measured using a colorimeter. The instrument automatically output ΔE and the data was recorded.

[0155] The test results are recorded in Table 5 below: Table 5. Performance of Examples 1-35 and Comparative Examples 1-18 of the present invention

[0156] As can be seen from the test results above, the colored flame-retardant silicone resins prepared in Examples 1-35 exhibit excellent flame-retardant properties. Their VW-1 burning time is all greater than but not greater than 11 seconds, and their breakdown voltage is 7.66-8.32 kV. They also have excellent insulation properties. Furthermore, after aging, no cracks appear when wound 360°, proving their excellent aging resistance. The colored flame-retardant silicone resins prepared in Examples 1-35 also exhibit excellent heat resistance. After pigment dispersion testing, their ΔE values ​​are all less than 1.9, proving that the organic pigments are uniformly dispersed in the system, forming a good organic pigment system. In summary, the colored flame-retardant silicone resins prepared by this invention have good flame-retardant properties, uniform color dispersion, and excellent aging and heat resistance. In Examples 1-35, the amount of heat-resistant pigment added is 2-10 parts. In Component A resin, there are 60-80 parts of vinyl-terminated polysiloxane, 10-30 parts of methyl-terminated polysiloxane, 5-20 parts of solid silicone resin, 5-15 parts of fumed silica, and 0.1-0.5 parts of platinum catalyst. In Component B resin, there are 60-80 parts of vinyl-terminated polysiloxane, 10-30 parts of methyl-terminated polysiloxane, 5-20 parts of solid silicone resin, 5-15 parts of crosslinking agent, and 0.05-0.3 parts of inhibitor. All these proportions are within the scope of this invention. The flame retardancy exhibited in Examples 1-35... The resin exhibits excellent performance, aging resistance, and heat resistance, with uniform dispersion of organic pigments. Component A comprises both solid and liquid silicone resins, while component B also comprises both solid and liquid silicone resins. This indicates that the solid silicone resin can not only crosslink with the liquid silicone resin to form a topologically entangled three-dimensional interpenetrating network structure, but also anchor the organic pigments within the resin system and improve their compatibility, ensuring uniform dispersion. This results in a colored flame-retardant silicone resin that combines flame retardant synergy with enhanced heat resistance, and offers a variety of durable colors.

[0157] In Examples 5-35, different types of organic pigments were added to prepare colored flame-retardant silicone resins, including red, orange, yellow, green, blue, purple, brown, and black. The structures of the above organic pigments all include azo groups and / or aromatic structures, and their conjugated structures have strong stability. The phenyl group in the solid silicone resin, as an aromatic ring, can promote the uniform dispersion of pigments in the matrix through π-π stacking and hydrogen bonding with the conjugated structure, and fix the pigment molecules to the resin matrix through chemical bonds, fundamentally eliminating the problems of migration and precipitation. It can perfectly combine the high hardness and high heat resistance of inorganic materials with the excellent optical properties of organic pigments to obtain colored flame-retardant silicone resins with performance far exceeding that of simple physical mixing. In Comparative Example 1, no organic pigment was added, and only component A and component B resins were used to obtain colored flame-retardant silicone resin. Due to the lack of pigment, the prepared colored flame-retardant silicone resin itself did not display color and could not provide color identification for different sleeves. In Comparative Example 2, only 1 part of organic pigment was added, which is lower than the 2-10 parts organic pigment addition range proposed in this invention. The color of the prepared colored flame-retardant silicone resin was significantly lighter. Due to insufficient addition of organic pigment, the color stability of the prepared colored flame-retardant silicone resin decreased, and fading occurred. In Comparative Example 3, 13 parts of organic pigment were added, which exceeds the 2-10 parts organic pigment range proposed in this invention. The color of the prepared colored flame-retardant silicone resin exceeded the standard range, with obvious color difference, and agglomerated particles were formed. It could not be evenly dispersed, which affected the surface aesthetics of the colored flame-retardant silicone resin. Moreover, the VW-1 burning time of Comparative Example 3 was 65s, which showed poor flame-retardant performance. This indicates that adding too much organic pigment reduced the flame-retardant performance of the colored flame-retardant silicone resin.

[0158] Comparative Example 4 added 100 parts of component A resin 5, which together with 100 parts of component B resin 4 formed the matrix resin composition. One part of solid silicone resin was added to component A resin 5. Comparative Example 6 added 100 parts of component A resin 4, which together with 100 parts of component B resin 5 formed the matrix resin composition. One part of solid silicone resin was added to component B resin 5. Experimental data showed that the flame retardant properties, mechanical properties, and aging resistance of Comparative Examples 4 and 6 were poor. Both had VW-1 burning times exceeding 60 seconds, failing the VW-1 flame retardant test. Furthermore, both Comparative Examples 4 and 6 exhibited cracking after thermal aging. Surface observation and experimental data showed that the ΔE of the colored flame-retardant silicone resin prepared in Comparative Example 4 was 3.5, while the ΔE of the colored flame-retardant silicone resin prepared in Comparative Example 6 was 3.6. This indicates that uneven dispersion of organic pigments led to uneven color, preventing the production of colored flame-retardant silicone resins with uniform color and aesthetically pleasing surfaces.

[0159] Comparative Example 5 added 100 parts of component A resin 6, which together with 100 parts of component B resin 4 formed the matrix resin composition. Among them, component A resin 6 contained 25 parts of solid silicone resin. Comparative Example 7 added 100 parts of component A resin 4, which together with 100 parts of component B resin 6 formed the matrix resin composition. Among them, component B resin 6 contained 25 parts of solid silicone resin. The experimental data showed that Comparative Example 5 and Comparative Example 7 had excellent flame retardant properties, but both Comparative Example 5 and Comparative Example 7 showed cracking after thermal aging. Comparative Example 12 added 100 parts of component A resin 7 and 100 parts of component B resin 7 to form the matrix resin component, and prepared a colored flame-retardant silicone resin with 6 parts of organic pigment. Neither component A nor component B resin 7 contained any solid silicone resin. Experimental data showed that the prepared colored flame-retardant silicone resin had poor flame retardancy, with a VW-1 burning time of 80 seconds, failing the VW-1 flame retardancy test. Furthermore, cracking occurred after thermal aging. Additionally, surface observation and pigment dispersion tests revealed that the colored flame-retardant silicone resin prepared in Comparative Example 12 had agglomerated color clumps on the surface, resulting in uneven color distribution, with a ΔE of 3.9, indicating uneven dispersion of the organic pigment. Therefore, the data shows that only when the amount of added solid silicone resin is within the range proposed in this invention can a colored flame-retardant silicone resin with excellent flame retardant properties, good insulation properties, and long-lasting color be obtained.

[0160] In Comparative Example 8, 80 parts of component A resin 4 were added; in Comparative Example 9, 90 parts of component B resin 4 were added; in Comparative Example 10, 1100 parts of component A resin 4 were added; and in Comparative Example 11, 120 parts of component B resin 4 were added. In these four comparative examples, the amounts of component A and component B resin added were all outside the range of 100 parts of component A resin and 100 parts of component B resin proposed in this invention. Experimental data showed that the VW-1 burning time of Comparative Example 8 was 68s, its breakdown voltage was 5.3kV, and ΔE was 3.6; the VW-1 burning time of Comparative Example 9 was 63s, its breakdown voltage was 5.5kV, and ΔE was 3.2. The flame retardant and insulating properties of Comparative Examples 8 and 9 were poor, and the organic pigments in Comparative Examples 8 and 9 were unevenly dispersed, resulting in uneven color patches on the surface of the obtained colored flame-retardant silicone resin.

[0161] Comparative Examples 8 and 9, and Comparative Examples 10 and 11 all showed cracking after thermal aging. Therefore, the data shows that only when the amount of A component resin and B component resin added is within the range proposed in this invention can a colored flame-retardant silicone resin with excellent mechanical properties and safety and environmental protection be obtained.

[0162] In Comparative Examples 13-16, both component A resin and component B resin were added in amounts of 100 parts. However, in Comparative Example 13, the amount of vinyl-terminated polysiloxane added to component A resin 8 was 50 parts, and the amount of vinyl-terminated polysiloxane added to component B resin 8 was 50 parts. In Comparative Example 14, the amount of vinyl-terminated polysiloxane added to component A resin 9 was 90 parts, and the amount of vinyl-terminated polysiloxane added to component B resin 9 was 90 parts. That is, in Comparative Examples 13 and 14, the amount of vinyl-terminated polysiloxane added was not within the range of 60-80 parts proposed in this invention. In Comparative Example 15, the amount of methyl-terminated polysiloxane added to component A resin 10 was 5 parts, and the amount of component B resin was... The amount of methyl-terminated polysiloxane added to resin 10 was 5 parts. In Comparative Example 16, the amount of methyl-terminated polysiloxane added to component A resin 11 was 40 parts, and the amount of methyl-terminated polysiloxane added to component B resin 11 was 40 parts. That is, in Comparative Examples 15 and 16, the amount of methyl-terminated polysiloxane added was not within the range of 10-30 parts proposed in this invention. The experimental data showed that Comparative Examples 13-16 all showed cracking after thermal aging, and the ΔE of Comparative Examples 13, 15 and 16 all exceeded 3.1. The surface of the obtained colored flame-retardant silicone resin showed uneven color patches, indicating that the organic pigments in Comparative Examples 13, 15 and 16 were not evenly dispersed.

[0163] The solid silicone resin added in Comparative Example 17 was methyl solid silicone resin, which does not contain phenyl groups and is not within the 10-30 mol% range proposed in this invention. Experimental data shows that the ΔE of Comparative Example 17 is 3.5, indicating that the organic pigment in Comparative Example 17 is unevenly dispersed because the methyl solid silicone resin lacks phenyl groups, making it unable to form a good compatibility system with the organic pigment. This results in uneven color patches and precipitation in the prepared colored flame-retardant silicone resin. Furthermore, although Comparative Example 17 passed the flame retardancy VW-1 test, its burning time was 15 seconds, exceeding the burning time of Examples 1-35, indicating that the lack of phenyl groups in the methyl solid silicone resin... Example 17 showed slightly inferior flame retardant performance compared to Examples 1-35, indicating that phenyl can improve the flame retardancy of the prepared colored flame retardant silicone resin. The solid silicone resin added in Comparative Example 18 was methyl solid silicone resin 4, wherein the phenyl content in the phenyl solid silicone resin 4 exceeded 30 mol%, which is higher than the 10-30 mol% range proposed in this invention. As can be seen from the experimental data, the cracking phenomenon in Comparative Example 18 was due to the excessively high phenyl content in the phenyl solid silicone resin. The large amount of phenyl produced huge steric hindrance, causing the molecular chain segments to change from flexible to rigid, resulting in excessively high brittleness of the colored flame retardant silicone resin, which in turn led to the cracking phenomenon in the prepared colored flame retardant silicone resin.

[0164] In summary, in this invention, Examples 1-35 all contain solid silicone resin and organic pigments. Among the organic pigments used, azo pigments contain azo groups (—N=N—) in their molecular structure; lake pigments precipitate organic dyes onto an inorganic carrier, with their chromophores originating from intramolecular conjugated systems; heterocyclic pigments and fused-ring ketone pigments both contain aromatic rings; and phthalocyanine pigments are dyes with a porphyrin ring structure composed of four pyrrole nuclei. These conjugated structures can specifically adsorb onto the organic pigments through π-π stacking and hydrogen bonding with the phenyl aromatic rings in the phenyl solid silicone resin, thereby anchoring the organic pigments in the solid silicone resin. By compounding solid silicone resin with liquid silicone resin, a multi-functional integrated system with "one agent, multiple effects" is constructed. Solid silicone resin with 10-30 mol% phenyl content participates in the curing reaction of liquid silicone resin as a functional filler, while also possessing flame retardancy. It can take into account multiple functions such as flame retardancy synergy and heat resistance enhancement, significantly improving the overall performance of the material. It breaks through the technical barrier of mutual exclusion of "color, flame retardancy and heat resistance", and for the first time achieves colored glass fiber sleeves that simultaneously meet the VW-1 flame retardancy standard and the temperature resistance requirement of above 200℃. The prepared colored flame retardant silicone resin achieves flame retardant and heat resistance performance and has a variety of durable colors. It is safe and environmentally friendly, showing broad application prospects.

[0165] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the patent protection scope of the present invention.

Claims

1. A colored flame-retardant silicone resin, characterized in that, The raw materials of the colored flame-retardant silicone resin, by weight, include 140-220 parts of liquid silicone resin 10-40 parts of solid silicone resin 2-10 parts of organic heat-resistant pigment. The solid silicone resin is a phenyl solid silicone resin, and the phenyl content in the phenyl solid silicone resin is 10-30 mol.

2. The colored flame-retardant silicone resin as described in claim 1, characterized in that, The liquid silicone resin comprises: 120-160 parts of vinyl-terminated polysiloxane 20-60 parts of methyl-terminated polysiloxane.

3. The colored flame-retardant silicone resin as described in claim 1, characterized in that, The organic heat-resistant color paste includes silicone oil and organic pigments, wherein the organic pigments are azo pigments, lake pigments, heterocyclic pigments, fused-ring ketone pigments, or phthalocyanine pigments, or two or more of the following: azo pigments, lake pigments, heterocyclic pigments, fused-ring ketone pigments, and phthalocyanine pigments.

4. The colored flame-retardant silicone resin as described in claim 3, characterized in that, The organic pigment content is 25-45%, the particle size is ≤3um, and the temperature resistance is ≥250℃.

5. The colored flame-retardant silicone resin as described in claim 3, characterized in that, The azo pigments are acetylacetylamine insoluble monoazo pigments, biphenylamine and pyrazolone insoluble diazo pigments, β-naphthol pigments, naphthol AS pigments, azo condensation pigments, or benzimidazole ketone pigments, or two or more of the following: acetylacetylamine insoluble monoazo pigments, biphenylamine and pyrazolone insoluble diazo pigments, β-naphthol pigments, naphthol AS pigments, azo condensation pigments, and benzimidazole ketone pigments. The lake pigments are two or more of the following: acetylacetylamine and pyrazolone azo lake pigments, 2-naphthol and 2-hydroxy-3-naphthoic acid series lake pigments, or naphthol AS type lake pigments; The heterocyclic pigments are two or more of the following: dioxazine pigments, 1,4-diketone-pyrrolopyrrole (DPP) pigments, quinacridone pigments, isoindolineone and isoindoline pigments, or quinphthalone pigments; The polycyclic ketone pigments are two or more of the following: perylene pigments, anthraquinone pigments, pyrenone pigments, and thioindigo pigments. The phthalocyanine pigments are copper phthalocyanine pigments, halogenated copper phthalocyanine pigments, metal-free phthalocyanine pigments, or phthalocyanine lake pigments, or two or more of the following: copper phthalocyanine pigments, halogenated copper phthalocyanine pigments, metal-free phthalocyanine pigments, and phthalocyanine lake pigments.

6. The colored flame-retardant silicone resin as described in claim 1, characterized in that, The raw materials for the colored flame-retardant silicone resin also include 10-30 parts of fumed silica Platinum catalyst 0.1-0.5 parts, 5-15 parts of crosslinking agent Inhibitor 0.05-0.3 parts, The fumed silica is hydrophobically treated with hexamethyldisilazane.

7. The colored flame-retardant silicone resin as described in claim 6, characterized in that, The platinum catalyst is a platinum-vinylsiloxane complex, a platinum-alkynyl group complex, or an alcohol-modified chloroplatinic acid, or two or more of the following: platinum-vinylsiloxane complex, platinum-alkynyl group complex, or alcohol-modified chloroplatinic acid, with a platinum content (calculated as Pt) of 3000-5000 ppm.

8. The colored flame-retardant silicone resin as described in claim 6, characterized in that, The crosslinking agent is at least one of methyl hydrogen polysiloxane, ethyl hydrogen polysiloxane, hydroxyl hydrogen polysiloxane, and epoxy hydrogen polysiloxane, with a viscosity of 50-500 mPa·s and a Si-H content of 0.5-1.2 mmol / g; the inhibitor is at least one of ethynylcyclohexanol, diallyl maleate, and tetravinyltetramethyltetrasiloxane.

9. A method for preparing the colored flame-retardant silicone resin as described in claim 2, characterized in that, Includes the following steps: Preparation of component A resin: Mix 60-80 parts of vinyl-terminated polysiloxane and 10-30 parts of methyl-terminated polysiloxane, stir until uniform, add 5-20 parts of solid silicone resin, stir at 160℃-180℃ for 15-20 min, stir until uniform, add 5-15 parts of fumed silica, then stir under vacuum for 20-30 min, when the temperature drops below 40℃, add 0.1-0.5 parts of platinum catalyst and stir until uniform to obtain component A resin; Preparation of component B resin: Mix 60-80 parts of vinyl-terminated polysiloxane and 10-30 parts of methyl-terminated polysiloxane, stir until uniform, add 5-20 parts of solid silicone resin, stir at 160℃-180℃ for 15-20 min, stir until uniform, add 5-15 parts of fumed silica, then stir under vacuum for 20-30 min. When the temperature drops below 40℃, add 5-15 parts of crosslinking agent and 0.05-0.3 parts of inhibitor, stir until uniform to obtain component B resin; The colored flame-retardant silicone resin is obtained by mixing component A resin, component B resin and organic heat-resistant color paste in a ratio of 100:100:2-10.

10. A colored flame-retardant silicone resin glass fiber sleeve, characterized in that, It is prepared from the colored flame-retardant silicone resin according to any one of claims 1-8.

11. A method for preparing a colored flame-retardant silicone resin glass fiber sleeve, characterized in that, Includes the following steps: The prepared colored flame-retardant silicone resin as described in claims 1-8 is coated onto the surface of a glass fiber braided sleeve. The coated glass fiber braided sleeve is then shaped at high temperature, cured at a constant temperature, cooled to room temperature, and then pulled and wound to obtain the colored flame-retardant silicone resin glass fiber sleeve.

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